The present invention relates to control systems, control methods, control devices, and programs.
　The present application claims priority based on Japanese Patent Application No. 2018-205622 filed in Japan on October 31, 2018, the contents of which are incorporated herein by reference.
Background technology
[0002]
　Conventionally, a rolling mill having a rolling roll has been used to roll a material to be rolled such as a steel plate. In this regard, Patent Document 1 discloses a technique for opening and closing a rolling roll by performing a first control and a second control. The first control is a control for releasing the rolling roll. In the first control, the material to be rolled in the rolled state is decelerated from the speed at the time of rolling to an extremely low speed, and the tension of the material to be rolled on the inlet side and the exit side of the rolling mill is equal to that of the material to be rolled on the rolling roll. It is controlled so that it does not come into contact with the material to be rolled from the closed state. The second control is a control for closing the rolling roll. In the second control, the rolling roll is not brought into contact with the material to be rolled in a state where the speed of the material to be rolled is extremely low, which is lower than the speed at the time of normal rolling, and other predetermined conditions are satisfied. After closing from the open state of, it is controlled to accelerate to the speed at the time of normal rolling.
Prior art literature
Patent documents
[0003]
Patent Document 1: Japanese Patent Application Laid-Open No. 2014-58801
Outline of the invention
Problems to be solved by the invention
[0004]
　By the way, the material to be rolled that is conveyed to the rolling mill may have an abnormality such as a hot band or meandering. If there is an abnormality in the material to be rolled that is conveyed to the rolling mill, it may not be possible to roll normally if rolling is continued, so it is necessary to open the rolling roll.
　However, if the rolling roll is suddenly released while the tension is controlled to give a predetermined tension to the material to be rolled, the torque of the motor that rotates the pinch roll fluctuates abruptly. Then, the material to be rolled slips against the pinch roll, the pinch roll is scratched, unsteady work such as adjustment and replacement of the pinch roll is required, and the time during which rolling cannot be performed increases. Further, if the state in which the material to be rolled continues to slide with respect to the pinch roll, a predetermined tension cannot be applied to the material to be rolled, and the state in which the material to be rolled cannot be rolled normally continues. Patent Document 1 does not describe the control when there is an abnormality in the material to be rolled that is conveyed to the rolling mill.
[0005]
　An object of the present invention is to enable stable rolling to be continued.
Means to solve problems
[0006]
　The outline of the present invention is as follows.
(1) The first aspect of the present invention is a double-roll type continuous casting machine, a rolling machine that rolls a steel plate with a pair of rolling rolls, and a transport that transports the steel plate in the direction of the rolling mill with a pair of transport rolls. The twin-roll continuous casting machine includes a machine and a pair of casting rolls that rotate in opposite directions, and the pair of the casting rolls is injected into an upper pool between the pair of the casting rolls. The molten steel was cooled, the molten steel that had been cooled and solidified was pressure-welded, and the steel plate was discharged from between the pair of the casting rolls. A control system for a casting and rolling facility that transports a steel plate in the direction of the rolling mill, in which rolling control for rolling the steel plate with a predetermined roll gap and at least one of the pair of the rolling rolls do not come into contact with the steel plate. The rolling mill control unit that controls the rolling mill by any of the controls including the open control for controlling the rolling mill, the tension control for transporting the steel plate with the steel plate at a predetermined tension, and the transport roll are defined. A transporter control unit that controls the conveyor by any control including speed control for transporting the steel plate at a rotation speed, and a rolling mill control unit that controls the rolling control to perform the rolling control, and the transporter control unit. It was determined that there was an abnormality in the steel plate when the first control unit that controls the tension control and the rolling control and the tension control that were started by the control by the first control unit were performed. In this case, a second control unit that controls the rolling mill control unit to perform the opening control and the conveyor control unit controls the speed control, and the speed control started by the control by the second control unit. When it is determined that the transfer roll is stable at the predetermined rotation speed, the transfer machine control unit controls to restart the tension control, and the rolling mill control unit controls to restart the rolling control. It is a control system having a third control unit for rolling and rolling.
(2) In the control system according to (1) above, the rolling mill control unit lightly reduces the steel sheet by making the roll gap larger than the rolling control, the opening control, and the defined roll gap. The rolling mill was controlled by any of the controls including the light rolling control, and it was determined that the pair of transport rolls were stabilized at the predetermined rotation speed by the speed control started by the control by the second control unit. In this case, the third control unit controls the rolling mill control unit to perform the light rolling control, then controls the conveyor control unit to restart the tension control, and then the rolling mill control unit. May be controlled to restart the rolling control.
(3) In the control system according to (2) above, when it is determined that the pair of transport rolls are stable at the predetermined rotation speed by the speed control started by the control by the second control unit, the above. The third control unit controls the rolling mill control unit to perform the light rolling control, then controls the conveyor control unit to restart the tension control, and then determines that there is no abnormality in the steel sheet. If this is the case, the rolling mill control unit controls to restart the rolling control, and after the tension control is restarted by the control by the third control unit, it is determined that there is an abnormality in the steel sheet, or When it is determined that there is an abnormality in the steel sheet when the rolling control and the tension control started by the control by the first control unit are performed, the second control unit is operated by the rolling mill control unit. The opening control may be controlled, and the conveyor control unit may be controlled to perform the speed control.
(4) In the control system according to any one of (1) to (3) above, when it is determined that the steel sheet is meandering, and when the steel sheet is abnormally changed in thickness. In at least one of the cases where the determination is made, an abnormality determination unit for determining that the steel sheet has an abnormality is further provided, and the rolling control and the tension control started by the control by the first control unit are performed. When the abnormality determination unit determines that the steel sheet has an abnormality, the second control unit controls the rolling mill control unit to perform the opening control, and the conveyor control unit controls the speed. May be controlled to do.
(5) In the control system according to (4) above, the abnormality determination unit determines whether or not an abnormal plate thickness variation has occurred in the steel plate based on the current of the electric motor that rotates the rolling roll. You may.
(6) In the control system according to any one of (1) to (5) above, when the rotation speed of the transfer roll is continuously included in the specified range for a specified time. Further, it has a speed determination unit for determining that the transfer roll is stable at the predetermined rotation speed, and after the speed control is started by the control by the second control unit, the transfer roll is determined by the speed determination unit. When it is determined that is stable at the predetermined rotation speed, the third control unit controls the conveyor control unit to restart the tension control, and the rolling mill control unit restarts the rolling control. You may control to do so.
[0007]
(7) A second aspect of the present invention is a twin-roll type continuous casting machine, a rolling machine that rolls a steel plate with a pair of rolling rolls, and a transport that transports the steel plate in the direction of the rolling mill with a pair of transport rolls. The rolling mill is controlled by either a machine, a rolling control for rolling the steel plate with a predetermined roll gap, or a control including an opening control for controlling at least one of the pair of the rolling rolls so as not to come into contact with the steel plate. A rolling mill control unit, a tension control for transporting the steel plate at a predetermined tension, and a control including a speed control for transporting the steel plate at a predetermined rotation speed. The twin-roll continuous casting machine includes a pair of casting rolls that rotate in opposite directions, and the pair of casting rolls is a pair of the casting. The molten steel injected into the upper pool between the rolls is cooled, the molten steel that has been cooled and solidified is pressure-welded, and the steel plate is discharged from between the pair of the cast rolls. It is a control method of a casting and rolling equipment for transporting the steel plate discharged from a roll-type continuous casting machine in the direction of the rolling mill, in which the rolling mill control unit controls the rolling control and the conveyor control unit. It was determined that there was an abnormality in the steel plate when the first control step for controlling the tension control and the rolling control and the tension control started by the control by the first control step were performed. In this case, a second control step in which the rolling mill control unit controls to perform the opening control and the conveyor control unit controls the speed control, and the speed control started by the control by the second control step. When it is determined that the transfer roll is stable at the predetermined rotation speed, the transfer machine control unit controls to restart the tension control, and the rolling mill control unit controls to restart the rolling control. It is a control method including the third control step of rolling and rolling.
[0008]
(8) A third aspect of the present invention is a twin-roll type continuous casting machine, a rolling mill that rolls a steel plate with a pair of rolling rolls, and a transport that transports the steel plate in the direction of the rolling mill with a pair of transport rolls. The rolling mill is controlled by either a machine, a rolling control for rolling the steel plate with a predetermined roll gap, or a control including an opening control for controlling at least one of the pair of the rolling rolls so as not to come into contact with the steel plate. A rolling mill control unit, a tension control for transporting the steel plate at a predetermined tension, and a control including a speed control for transporting the steel plate at a predetermined rotation speed. The twin-roll continuous casting machine includes a pair of casting rolls that rotate in opposite directions, and the pair of casting rolls is a pair of the casting. The molten steel injected into the upper pool between the rolls is cooled, the molten steel that has been cooled and solidified is pressure-welded, and the steel plate is discharged from between the pair of the cast rolls. A control device that controls a casting and rolling facility that conveys the steel plate discharged from a roll-type continuous casting machine in the direction of the rolling mill, and the rolling mill control unit controls the rolling control to perform the rolling control. It is determined that there is an abnormality in the steel plate when the first control unit that the control unit controls to perform the tension control and the rolling control and the tension control started by the control by the first control unit are performed. If this is the case, the rolling mill control unit controls the opening control, and the conveyor control unit controls the speed control, and the second control unit is controlled by the second control unit. When the speed control determines that the transfer roll is stable at the predetermined rotation speed, the transfer machine control unit controls to restart the tension control, and the rolling mill control unit restarts the rolling control. It is a control device including a third control unit that controls the rolling and rolling.
[0009]
(9) A fourth aspect of the present invention is a twin-roll continuous casting machine, a rolling mill that rolls a steel plate with a pair of rolling rolls, and a transport that transports the steel plate in the direction of the rolling mill with a pair of transport rolls. The rolling mill is controlled by either a machine, a rolling control for rolling the steel plate with a predetermined roll gap, or a control including an opening control for controlling at least one of the pair of the rolling rolls so as not to come into contact with the steel plate. A rolling mill control unit, a tension control for transporting the steel plate at a predetermined tension, and a control including a speed control for transporting the steel plate at a predetermined rotation speed. The twin-roll continuous casting machine includes a pair of casting rolls that rotate in opposite directions, and the pair of casting rolls is a pair of the casting. The molten steel injected into the upper pool between the rolls is cooled, the molten steel that has been cooled and solidified is pressure-welded, and the steel plate is discharged from between the pair of the cast rolls. It is a program for controlling a casting and rolling facility that conveys the steel plate discharged from a roll-type continuous casting machine in the direction of the rolling mill, and controls a computer so that the rolling mill control unit performs the rolling control. An abnormality occurs in the steel plate when the first control unit that controls the conveyor control unit to perform the tension control, and the rolling control and the tension control that are started by the control by the first control unit are performed. When it is determined that there is, the second control unit that controls the rolling mill control unit to perform the opening control and the conveyor control unit controls the speed control, and the control by the second control unit. When the transfer roll is determined to be stable at the predetermined rotation speed by the speed control started in step 1, the transfer machine control unit controls to restart the tension control, and the rolling mill control unit controls the rolling. It is a program for functioning as a third control unit that controls to resume control.
The invention's effect
[0010]
　According to the present invention, rolling can be continued stably.
A brief description of the drawing
[0011]
[Fig. 1] Fig. 1 is a diagram showing an example of a configuration of a casting and rolling system.
[Fig. 2A] Fig. 2A is a diagram showing an example of a hardware configuration of a main control unit.
[Fig. 2B] Fig. 2B is a diagram showing an example of a hardware configuration of a carrier control device.
[Fig. 3] Fig. 3 is a diagram showing an example of a functional configuration of a main control unit.
FIG. 4A is a diagram for explaining tension control.
[Fig. 4B] It is a figure for demonstrating speed control.
FIG. 5A is a perspective view showing an example of a casting portion of a double-roll type continuous casting machine.
FIG. 5B is a plan view showing an example of a cast portion.
FIG. 5C is a perspective view showing an example of a steel plate on which a hot band is formed.
[Fig. 6] Fig. 6 is a diagram showing a rolling motor current graph and the like.
FIG. 7 is a cross-sectional view showing an example of a steel plate.
FIG. 8A is a diagram showing a casting roll speed graph.
FIG. 8B is a diagram showing a first pinch roll speed graph.
FIG. 8C is a diagram showing a second pinch roll velocity graph.
FIG. 8D is a diagram showing a rolling roll speed graph.
FIG. 9 is a flowchart showing an example of control processing.
FIG. 10A is a diagram showing a casting roll speed graph.
FIG. 10B is a diagram showing a first pinch roll speed graph.
FIG. 10C is a diagram showing a second pinch roll velocity graph.
[Fig. 10D] It is a figure which shows the rolling roll speed graph.
Mode for carrying out the invention
[0012]
[Overall Configuration]
　First, the casting and rolling system 1 of the present embodiment will be described with reference to FIG. FIG. 1 is a diagram showing an example of the configuration of the casting and rolling system 1. The casting and rolling system 1 has a casting and rolling equipment 100 and a control system 101, and casts and rolls a steel plate 10 as a material to be rolled. In this embodiment, the bottom is the direction of gravity and the top is the opposite direction of gravity.
　The casting and rolling equipment 100 includes a double-roll type continuous casting machine 150, a processing chamber 250, a cooling equipment 252, a meandering total 254, a conveyor 300, a rolling mill 350, a looper 400, and a coiler 450. ..
[0013]
　The double-roll type continuous casting machine 150 is a casting machine that manufactures a steel plate 10 from molten steel, and includes an injection unit 160 and a casting unit 200.
　The injection unit 160 is a device for injecting molten steel into the casting unit 200, and includes a tundish 161 and a stopper 162.
　The tundish 161 is a container that temporarily receives the molten steel injected from the ladle. The molten steel injected into the tundish 161 is injected into the hot water pool 210 of the casting portion 200 through a spout which is a through hole provided in the lower part of the tundish 161.
　The stopper 162 is a rod-shaped member that can open and close the spout provided at the lower part of the tundish 161, is arranged above the spout, and extends in the vertical direction. By moving the stopper 162 in the vertical direction, the amount of molten steel injected from the tundish 161 into the casting portion 200 changes. Further, when the stopper 162 moves to the lowermost position and the spout of the tundish 161 is closed, molten steel is not injected from the tundish 161 into the casting portion 200.
[0014]
　The casting unit 200 manufactures the steel sheet 10 from the molten steel injected from the injection unit 160. The casting section 200 includes a pair of casting rolls 201, a pair of weirs 202, a casting motor 205, and a casting machine speedometer 206.
　Each of the pair of casting rolls 201 is a columnar roll, and can rotate around the central axis as a rotation axis. The pair of casting rolls 201 have the same shape, and their respective rotation axes are arranged so as to be substantially parallel on the same horizontal plane. Further, a gap called a casting roll gap is provided between the pair of casting rolls 201. The pair of casting rolls 201 rotate in opposite directions so that the ends on the casting roll gap side advance downward. The area surrounded by the upper side of the cast roll gap and the weir 202 is the hot water pool 210 in which the molten steel injected from the injection portion 160 is collected.
　When the pair of casting rolls 201 rotate while the molten steel is injected into the puddle 210, the casting roll 201 cools the molten steel on the surface of the casting roll 201 and solidifies it. Then, the pair of casting rolls 201 press-weld the solidified shell, which is solidified molten steel, to discharge the steel plate 10 downward from the casting roll gap.
[0015]
　The pair of weirs 202 are provided at both ends of the casting roll 201 in the rotation axis direction and at least above the casting roll gap to prevent molten steel from spilling from the puddle 210 in the rotation axis direction of the casting roll 201.
　The casting motor 205 rotates a pair of casting rolls 201.
　The casting machine speedometer 206 measures the rotation speed of the casting motor 205. The rotation speed of the casting motor 205 corresponds to the casting roll speed. The casting roll speed is the speed of the surface of the casting roll 201 and is proportional to the rotation speed of the casting motor 205. The casting roll speed represents the rotation speed of the casting roll 201.
[0016]
　The processing chamber 250 is filled with gas to prevent oxidation of the steel sheet 10 discharged from the double-roll type continuous casting machine 150.
　The cooling equipment 252 is arranged between the first conveyor 300A and the second conveyor 300B, and cools the steel plate 10 by spraying cooling water on the steel plate 10 to be conveyed.
　The meandering total 254 measures the meandering amount of the steel plate 10 and outputs it to the main control device 500. The amount of meandering is the planned normal position of the steel plate 10 in the direction perpendicular to the transport direction of the steel plate 10 and the actual position of the steel plate 10 in the direction perpendicular to the transport direction of the steel plate 10 when the steel plate 10 is viewed from above. It is a quantity representing the difference with. The planned normal position shall be determined in advance. In this embodiment, the meandering total 254 is arranged in front of the rolling mill 350. More specifically, the meandering total 254 is arranged between the second conveyor 300B and the rolling mill 350. However, the meandering total 254 may be arranged behind the rolling mill 350. More specifically, the meandering total 254 may be arranged between the rolling mill 350 and the looper 400.
[0017]
　The transport machine 300 transports the steel plate 10 by pulling in the steel plate 10 and discharging it in the transport direction. The transfer machine 300 includes a pair of pinch rolls 301, a transfer motor 303, and a transfer machine speedometer 304.
　Each of the pair of pinch rolls 301 is a columnar roll, is rotatable about a central axis as a rotation axis, and is arranged so as to be arranged vertically. A gap called a pinch roll gap is provided between the pair of pinch rolls 301. The pair of pinch rolls 301 convey the steel plate 10 by passing the steel plate 10 through the pinch roll gap, sandwiching the steel plate 10, and rotating the steel plate 10 in opposite directions while pressing the surface of the steel plate 10. The pinch roll 301 is also called a transport roll.
　The transport motor 303 rotates a pair of pinch rolls 301. The torque of the transport motor 303 is proportional to the current flowing through the transport motor 303.
　The conveyor speedometer 304 measures the rotation speed of the transport motor 303. The rotation speed of the transport motor 303 corresponds to the pinch roll speed. The pinch roll speed is the speed on the surface of the pinch roll 301 and is proportional to the rotation speed of the transfer motor 303. The pinch roll speed represents the rotation speed of the pinch roll 301.
[0018]
　The casting and rolling equipment 100 includes a first conveyor 300A and a second conveyor 300B as the conveyor 300.
　The first carrier 300A is arranged at a position deviated from the casting roll gap of the double-roll type continuous casting machine 150 when viewed from above. The first transfer machine 300A conveys the steel plate 10 by drawing in the steel plate 10 discharged from the double-roll type continuous casting machine 150 and discharging it in the direction of the second transfer machine 300B. The second transfer machine 300B draws in the steel plate 10 conveyed from the first transfer machine 300A and discharges it in the direction of the rolling mill 350 to convey the steel plate 10 to the rolling mill 350.
[0019]
　The pinch roll 301, the transport motor 303, the transport speedometer 304, and the pinch roll speed of the first transport machine 300A are set to the first pinch roll 301A, the first transport motor 303A, the first transport speedometer 304A, and the pinch roll speed, respectively. , Called the first pinch roll speed.
　Further, the pinch roll 301, the transport motor 303, the transport speedometer 304, and the pinch roll speed of the second conveyor 300B are set to the second pinch roll 301B, the second transport motor 303B, and the second conveyor speedometer 304B, respectively. , And the second pinch roll speed.
[0020]
　The rolling mill 350 rolls the steel sheet 10 transported from the second conveyor 300B. The rolling mill 350 rolls the steel sheet 10 while pulling it in, and discharges the steel sheet 10 in the transport direction. The rolling mill 350 includes a pair of rolling rolls 351 and a pair of backup rolls 352, a rolling mill power cylinder 353, a rolling motor 354, and a rolling mill speedometer 355.
　Each of the pair of rolling rolls 351 is a columnar roll, is rotatable about a central axis as a rotation axis, and is arranged vertically side by side so that the respective rotation axes are parallel to each other. A gap called a rolling roll gap is provided between the pair of rolling rolls 351. The pair of rolling rolls 351 rolls the steel sheet 10 by passing the steel sheet 10 through the rolling roll gap, sandwiching the steel sheet 10, and rotating the steel sheet 10 in opposite directions while applying a force to press the steel sheet 10.
　Each of the pair of backup rolls 352 is a columnar roll, is rotatable about a central axis as a rotation axis, and is arranged so as to be arranged vertically with the pair of rolling rolls 351 sandwiched between them. The upper backup roll 352 is arranged above the upper rolling roll 351 so as to come into contact with the upper rolling roll 351. The lower backup roll 352 is arranged below the lower rolling roll 351 so as to come into contact with the lower rolling roll 351.
[0021]
　The rolling mill power cylinder 353 is, for example, a hydraulic servo cylinder, and applies a force to the upper backup roll 352 to change the rolling mill pressing force or the rolling roll gap. A rolling mill pressing force is applied to the steel sheet 10 by the conveyor power cylinder 302 via the upper rolling roll 351. The rolling mill pressing force is a force that the rolling roll 351 presses the steel sheet 10 to roll the steel sheet 10.
　The rolling motor 354 rotates a pair of rolling rolls 351.
　The rolling mill speedometer 355 measures the rotational speed of the rolling motor 354. The rotation speed of the rolling motor 354 corresponds to the rolling roll speed. The rolling roll speed is the speed of the surface of the rolling roll 351 and is proportional to the rotation speed of the rolling motor 354. The rolling roll speed represents the rotation speed of the rolling roll 351.
[0022]
　The looper 400 applies tension to the steel plate 10. The looper 400 of the present embodiment is a counter balance weight type looper. The looper 400 is arranged between the rolling mill 350 and the coiler 450.
　The coiler 450 pulls in the steel plate 10 and winds up the steel plate 10.
[0023]
　The control system 101 controls the casting and rolling equipment 100. The control system 101 includes a main control device 500, a conveyor control device 550, a rolling speed control device 570, and a rolling gap control device 580.
　The main control device 500 is an information processing device that controls the casting and rolling equipment 100 by controlling the conveyor control device 550, the rolling speed control device 570, and the rolling gap control device 580.
　The transfer machine control device 550 is an information processing device that controls the pinch roll 301 by controlling the transfer machine 300 based on the control of the main control device 500. More specifically, the transfer machine control device 550 controls the pinch roll 301 by controlling the current of the transfer motor 303 included in the transfer machine 300. The control system 101 includes a first carrier control device 550A and a second carrier control device 550B as the carrier control device 550. The first transporter control device 550A controls the first transporter 300A. More specifically, the first transfer machine control device 550A controls the first pinch roll 301A by adjusting the current of the first transfer motor 303A. The second carrier control device 550B controls the second carrier 300B. More specifically, the second transfer machine control device 550B controls the second pinch roll 301B by adjusting the current of the second transfer motor 303B. For example, an inverter is used as the carrier control device 550.
[0024]
　The rolling speed control device 570 is an information processing device that controls the rolling roll speed by controlling the rolling mill 350 based on the control of the main control device 500. More specifically, the rolling speed control device 570 controls the rolling roll speed by controlling the current of the rolling motor 354 included in the rolling mill 350. For example, an inverter is used as the rolling speed control device 570.
　The rolling gap control device 580 is an information processing device that controls the rolling roll gap by controlling the rolling mill 350 based on the control of the main control device 500. More specifically, the rolling gap control device 580 controls the rolling roll gap by controlling the rolling mill power cylinder 353 included in the rolling mill 350. The rolling gap control device 580 is also called a rolling mill control device.
[0025]
　Next, the transport path of the steel sheet 10 in the casting and rolling equipment 100 will be described. First, the steel plate 10 is discharged from between the pair of casting rolls 201 of the double-roll type continuous casting machine 150. Next, the steel plate 10 passes between the pair of first pinch rolls 301A included in the first conveyor 300A and between the pair of second pinch rolls 301B included in the second conveyor 300B. Then, the steel plate 10 is rolled between the pair of rolling rolls 351 of the rolling mill 350 and discharged to the looper 400. Next, the steel plate 10 passes through the looper 400 and is wound by the coiler 450.
[0026]
[Hardware Configuration]
　Next, the hardware configuration of the main control device 500 will be described with reference to FIG. 2A. FIG. 2A is a diagram showing an example of the hardware configuration of the main control device 500.
　The main control device 500 is a computer such as a PLC (programmable logic controller), and includes a CPU 501, a storage device 502, a communication interface 503, an input device 504, and a bus 505 connecting them.
　The CPU 501 controls the entire main control device 500. When the CPU 501 executes the process based on the program stored in the storage device 502 or the like, the function of the main control device 500 shown in FIG. 3 and the process of FIG. 9 are realized.
[0027]
　The storage device 502 is a storage medium such as a RAM, a ROM, or an HDD, and stores a program or temporarily stores data used by the CPU 501.
　The communication interface 503 controls communication between the main control device 500 and the conveyor control device 550, the rolling speed control device 570, and the rolling gap control device 580.
　The input device 504 receives an input from the operator. As the input device 504, various switches, buttons, a touch panel, a keyboard, a mouse, and the like are used.
[0028]
　The main control device 500 has a function of virtually dividing the CPU 501, and can perform parallel processing. Further, the CPU 501 can acquire the information of the measuring instrument of the casting and rolling equipment 100 via the communication interface 503. The measuring instrument of the casting and rolling equipment 100 is an apparatus for acquiring various information of the casting and rolling equipment 100, and includes a meandering meter 254, a speedometer such as a casting machine speedometer 206 and a rolling mill speedometer 355.
[0029]
　Next, the hardware configuration of the carrier control device 550 will be described with reference to FIG. 2B. FIG. 2B is a diagram showing an example of the hardware configuration of the carrier control device 550.
　The carrier control device 550 is a computer such as an inverter, and includes a CPU 551, a storage device 552, a communication interface 553, and a bus 554 connecting them.
　The CPU 551 controls the entire carrier control device 550. When the CPU 551 executes the process based on the program stored in the storage device 552 or the like, the functions of the conveyor control device 550 shown in FIGS. 4A and 4B are realized.
　The storage device 552 is a storage medium such as a RAM, a ROM, or an HDD, and stores a program or temporarily stores data used by the CPU 551.
　The communication interface 553 controls communication between the carrier control device 550 and the main control device 500 and the carrier 300.
[0030]
　The hardware configuration of the rolling speed control device 570 and the rolling gap control device 580 is the same as that of the conveyor control device 550. For example, the function of the rolling gap control device is realized by the CPU of the rolling gap control device 580 executing the process based on the program stored in the storage device or the like of the rolling gap control device 580.
[0031]
[Functional Configuration]
　Next, the functional configuration of the main control device 500 will be described with reference to FIG. FIG. 3 is a diagram showing an example of the functional configuration of the main control device 500. The main control device 500 includes a first control unit 510, a second control unit 511, a third control unit 512, an abnormality determination unit 514, a speed determination unit 515, a tension determination unit 516, and a processing management unit 517. , Equipped with.
[0032]
　The first control unit 510 controls the rolling gap control device 580 to perform rolling control, and the conveyor control device 550 to control the tension control. Rolling control and tension control will be described later.
　The second control unit 511 opens the rolling gap control device 580 when it is determined that there is an abnormality in the steel sheet 10 while the rolling control started by the control by the first control unit 510 and the tension control are being performed. It is controlled to perform control, and the conveyor control device 550 is controlled to perform speed control. Open control and speed control will be described later.
　The third control unit 512 determined that the first pinch roll speed was stable at the first speed and the second pinch roll speed was stable at the second speed by the speed control started by the control by the second control unit 511. In this case, the conveyor control device 550 controls to restart the tension control, and the rolling gap control device 580 controls to restart the rolling control.
　The first speed and the second speed are predetermined speeds according to the characteristics of the casting and rolling equipment 100 and the like. The first speed and the second speed may be the same speed. The first speed and the second speed are, for example, the casting roll speed at the time of casting and rolling in the casting and rolling equipment 100.
[0033]
　The abnormality determination unit 514 determines that the steel plate 10 is abnormal, at least in either case of determining that the steel plate 10 is meandering or determining that the steel plate 10 has an abnormal thickness variation. judge. An example of abnormal plate thickness variation in the steel plate 10 is a hot band, which will be described later.
　The speed determination unit 515 determines that the first pinch roll speed is stable at the first speed when the first pinch roll speed is continuously included in the first speed range during the first speed determination time. .. Further, the speed determination unit 515 states that the second pinch roll speed is stable at the second speed when the second pinch roll speed is continuously included in the second speed range during the second speed determination time. judge.
　The first speed range is the range of speeds including the first speed. The second speed range is the range of speeds including the second speed. Appropriate values ​​for the casting and rolling equipment 100 are determined for the first speed range, the second speed range, the first speed determination time, and the second speed determination time by simulation, experiment, or the like.
[0034]
　In the tension determination unit 516, when the rear surface tension of the first conveyor 300A is continuously included in the first tension range during the first tension determination time, the rear surface tension of the first conveyor 300A is the first tension. Is judged to be stable. Further, in the tension determination unit 516, when the rear surface tension of the second conveyor 300B is continuously included in the second tension range during the second tension determination time, the rear surface tension of the second conveyor 300B is second. 2 It is judged that the tension is stable.
　The first tension and the second tension are predetermined according to the type of the steel sheet 10, the rolling amount, and the like. The first tension range is the range of tension including the first tension. The second tension range is the range of tension including the second tension. Appropriate values ​​for the casting and rolling equipment 100 are determined for the first tension range, the second tension range, the first tension determination time, and the second tension determination time by simulation, experiment, or the like.
[0035]
　The rear surface tension of the conveyor 300 is the tension of the steel plate 10 on the rear side of the conveyor 300 (the traveling direction side of the steel plate 10). For example, the rear surface tension of the first conveyor 300A is the tension between the first pinch roll 301A and the second pinch roll 301B, which is a roll on the rear side of the first pinch roll 301A. The rear surface tension of the second conveyor 300B is the tension between the second pinch roll 301B and the rolling roll 351 which is a roll on the rear side of the second pinch roll 301B. The rear surface tension of the conveyor 300 is also referred to as the rear surface tension of the pinch roll 301. Further, the rear tension of the first conveyor 300A and the rear tension of the second conveyor 300B are also referred to as the rear tension of the first pinch roll 301A and the rear tension of the second pinch roll 301B, respectively.
　The processing management unit 517 controls each function included in the main control device 500.
[0036]
　Next, the functional configuration of the conveyor control device 550 will be described. The transport machine control device 550 has a transport machine control unit. The conveyor control unit controls the conveyor 300 by either tension control or control including speed control. The carrier control unit includes a tension control unit 560 that performs tension control and a speed control unit 561 that performs speed control. The conveyor control unit may be configured so that the conveyor 300 can be controlled by a control other than tension control and speed control.
　First, the tension control performed by the tension control unit 560 will be described with reference to FIG. 4A. FIG. 4A is a diagram for explaining tension control.
　The tension control is a control for the tension control unit 560 to transfer the steel plate 10 by setting the rear surface tension of the pinch roll 301 to a set tension which is a predetermined tension. The tension control unit 560 of the transfer machine control device 550 controls the tension, so that the transfer machine 300 conveys the steel plate 10 with the rear surface tension of the pinch roll 301 as the set tension. The tension control unit 560 of the first conveyor control device 550A uses the first tension already described as the set tension. The tension control unit 560 of the second carrier control device 550B uses the second tension already described as the set tension.
[0037]
　The tension control performed by the tension control unit 560 will be described in more detail.
　The tension control unit 560 determines the torque limit based on the set tension as the first process. The torque limit is an upper limit value of the torque of the conveyor motor 303 controlled by the tension control unit 560. The tension control unit 560 controls the torque of the transfer motor 303 so as not to exceed the determined torque limit.
　Next, in the tension control unit 560, as a second process, the pinch roll speed of the pinch roll 301 corresponding to the transport motor 303 controlled by the tension control unit 560 is set by a differential speed command from the roll speed of the roll adjacent to the rear side. The transport motor 303 is controlled so as to be slow. It is assumed that the tension control unit 560 has previously acquired the differential speed command from the main control device 500.
　By the second process, the pinch roll speed of the pinch roll 301 corresponding to the transport motor 303 controlled by the tension control unit 560 becomes slower than the roll speed of the roll adjacent to the rear side by the differential speed command. Therefore, the torque of the transport motor 303 controlled by the tension control unit 560 gradually increases, and finally the torque of the transport motor 303 becomes constant at the torque limit determined in the first process. This torque limit corresponds to the set tension. Therefore, when the torque of the transport motor 303 reaches the torque limit, the tension of the steel plate 10 is stabilized at the set tension. However, the tension control unit 560 may perform tension control by a method other than the tension control described here.
[0038]
　Next, the speed control performed by the speed control unit 561 will be described with reference to FIG. 4B. FIG. 4B is a diagram for explaining speed control.
　The speed control is a control for the conveyor 300 to transfer the steel sheet 10 by setting the pinch roll speed to a set speed which is a predetermined speed. The speed control unit 561 of the transfer machine control device 550 controls the speed, so that the transfer machine 300 transfers the steel plate 10 with the pinch roll speed set to the set speed. The speed control unit 561 of the first carrier control device 550A uses the first speed already described as the set speed. The speed control unit 561 of the second carrier control device 550B uses the second speed already described as the set speed.
　The speed control performed by the speed control unit 561 will be described in more detail.
　The speed control unit 561 calculates the actual value of the pinch roll speed based on the rotation speed of the transfer motor 303 acquired from the transfer machine speedometer 304.
　Next, the speed control unit 561 determines the current to be passed through the transfer motor 303 so that the pinch roll speed approaches the set speed based on the difference between the actual value of the pinch roll speed and the set speed.
　Next, the speed control unit 561 controls so that the determined current flows through the transfer motor 303.
　By repeating this process, the speed control unit 561 controls the conveyor 300 to transfer the steel sheet 10 at a set pinch roll speed.
[0039]
　Next, the functional configuration of the rolling speed control device 570 will be described. The rolling speed control device 570 includes a speed control unit. The speed control unit of the rolling speed control device 570 uses the same control method as the speed control unit 561 of the conveyor control device 550, and the rolling mill 350 sets the rolling roll speed to a predetermined rolling roll speed and conveys the steel sheet 10. The rolling motor 354 is controlled so as to do so.
[0040]
　Next, the functional configuration of the rolling gap control device 580 will be described. The rolling gap control device 580 has a rolling mill control unit. The rolling mill control unit controls the rolling mill 350 by any of control including rolling control, open control, and light rolling control. The rolling mill control unit includes a rolling control unit that performs rolling control, an opening control unit that performs opening control, and a light reduction control unit that performs light reduction control. The rolling mill control unit may be configured so that the rolling mill 350 can be controlled by a control other than rolling control, opening control, and light rolling control.
[0041]
　The rolling control unit performs rolling control that controls the rolling mill power cylinder 353 of the rolling mill 350 so as to roll the steel sheet 10 with the rolling roll gap as the first rolling roll gap. When rolling control is performed, tension control is performed by the tension control unit 560 in the conveyor control device 550. This is, for example, when rolling the steel sheet 10 by rolling control, a set tension is applied to the steel sheet 10 so that the steel sheet 10 can be rolled stably. The first rolling roll gap is predetermined as a rolling parameter.
　The opening control unit performs opening control for controlling the rolling mill power cylinder 353 so that at least one of the pair of rolling rolls 351 does not come into contact with the steel plate 10. The state in which at least one of the pair of rolling rolls 351 does not come into contact with the steel sheet 10 is called roll opening.
　The light rolling control unit performs light rolling control to control the rolling mill power cylinder 353 of the rolling mill 350 so that the rolling roll gap is set to the second rolling roll gap and the steel sheet 10 is lightly rolled. The second rolling roll gap is a value larger than the first rolling roll gap.
[0042]
[Hot Band]
　Next, the hot band 13 of the steel plate 10, which is an example of abnormal thickness fluctuation of the steel plate 10, will be described with reference to FIGS. 5A, 5B, and 5C. FIG. 5A is a perspective view showing an example of a casting portion 200 of the twin roll type continuous casting machine 150. FIG. 5B is a plan view showing an example of the casting portion 200. FIG. 5C is a perspective view showing an example of the steel plate 10 on which the hot band 13 is formed.
　As shown in FIG. 5C, the hot band 13 is a thick portion of the steel plate 10 formed by the metal 12 on the side surface of the weir 202 entering during casting. The bullion 12 on the side surface of the weir 202 as shown in FIG. 5A is formed by solidifying the molten steel 11 adhering to the side surface of the weir 202 due to fluctuations in the molten metal level (surface height of the molten steel 11) during casting or the like. Will be done.
　The bullion 12 on the side surface of the weir 202 is peeled off from the weir 202 due to the lower end of the bullion 12 being caught in the casting roll 201 or the like, and as shown in FIG. 5B, between the pair of casting rolls 201. May get in. When the base metal 12 enters between the pair of casting rolls 201, the hardness of the base metal 12 increases the distance between the pair of casting rolls 201, and as shown in FIG. 5C, the steel plate 10 on which the hot band 13 is formed is formed. It is discharged from the double roll type continuous casting machine 150.
　For example, in a normal continuous casting machine having a tundish, a mold, and a plurality of rolls, the molten steel discharged from the tundish is cooled through the mold and conveyed to a plurality of rolls to manufacture a steel sheet. , Powder having a function as a heat insulating material is put into the mold. This powder flows between the mold and the solidified shell and also acts as a lubricant. Therefore, the amount of metal adhering to the side surface of the mold due to fluctuations in the molten metal level is small. On the other hand, in the double-roll type continuous casting machine, since rapid cooling is generally required, powder having a function as a heat insulating material and a lubricant is not added. Therefore, the lubricity is inferior to that of a normal continuous casting machine. Therefore, in the double-roll type continuous casting machine, the amount of the bullion 12 adhering to the side surface of the weir 202 is larger than the amount of the bullion adhering to the side surface of the mold in a normal continuous casting machine. Therefore, in the case of a double-roll type continuous casting machine, the hot band 13 is generally likely to be formed.
[0043]
[Method of detecting the occurrence of a hot band]
　Next, a method of detecting the occurrence of a hot band will be described with reference to FIG. FIG. 6 is a diagram showing a rolling motor current graph 600 and a rolling roll speed graph 601.
　The rolling motor current graph 600 of FIG. 6 shows the time change of the current flowing through the rolling motor 354 when actually casting and rolling in the casting and rolling system 1. The rolling roll speed graph 601 of FIG. 6 shows the time change of the rolling roll speed when the casting and rolling are actually performed by the casting and rolling system 1. In the rolling roll speed graph 601, the rolling roll speed is expressed in mpm (meters / minute). When acquiring the data of FIG. 6, the rolling speed control device 570 controls the speed control unit to perform speed control, and the rolling gap control device 580 controls the rolling control unit to perform rolling control. In the rolling motor current graph 600, the hot band 13 of the steel sheet 10 reached the rolling roll 351 at a time of about 57.4 (sec).
　As can be seen from the rolling motor current graph 600, when the hot band 13 of the steel sheet 10 reaches the rolling roll 351 the current of the rolling motor 354 increases and reaches the upper limit. Further, as can be seen from the rolling roll speed graph 601, after the hot band 13 of the steel plate 10 reaches the rolling roll 351 the rolling roll speed becomes 0 (zero), and the transfer of the steel plate 10 is stopped in the rolling mill 350.
[0044]
　It is considered that this is partly because the rolling speed control device 570 and the rolling gap control device 580 operate as follows. When the hot band 13 reaches the rolling roll 351, a force in the direction of increasing the rolling roll gap is applied to the rolling roll 351. In this case, the rolling control unit of the rolling gap control device 580 causes the upper rolling roll 351 to press down the steel sheet 10 with a strong force by the rolling mill power cylinder 353 in order to make the rolling roll gap the first rolling roll gap. Control. The speed control unit of the rolling speed control device 570 controls so as to maintain the rolling roll speed. However, since the upper rolling roll 351 reduces the steel sheet 10 with a strong force, the speed control unit of the rolling speed control device 570 increases the current of the rolling motor 354 in order to maintain the rolling roll speed, and the rolling motor 354. Increases the torque of. In this way, the current of the rolling motor 354 reaches the upper limit. Finally, the torque of the rolling motor 354 cannot be increased, the rolling roll 351 cannot withstand the force of pressing the steel plate 10, and the rolling roll speed becomes 0 (zero).
[0045]
　As shown in the rolling motor current graph 600, when the hot band 13 of the steel sheet 10 reaches the rolling roll 351 the current of the rolling motor 354 increases and reaches the upper limit. From this, it can be determined that the hot band 13 has reached the rolling motor 354 when the current of the rolling motor 354 continuously exceeds the current threshold value I1 during the hot band determination time T1. The current threshold value I1 is a current threshold value used for determining the hot band 13. The current threshold value I1 is a current that does not flow in the rolling motor 354 during normal rolling, and is a current that flows in the rolling motor 354 after the hot band 13 reaches the rolling roll 351. The current threshold value I1 is predetermined based on the rolling motor current graph 600. The hot band determination time T1 is predetermined in order to prevent erroneous determination.
[0046]
[Roll release]
　Next, the necessity of roll release when a hot band occurs will be described with reference to the rolling roll speed graph 601 of FIG. As described above, when the rolling control unit of the rolling gap control device 580 continues rolling control after the hot band 13 of the steel sheet 10 reaches the rolling roll 351, the rolling roll speed becomes 0 (zero), and the steel sheet 350 in the rolling mill 350. The transport of 10 is stopped. Therefore, when the hot band 13 reaches the rolling roll 351, the roll is released and the hot band 13 waits for the rolling roll 351 to pass through. As a result, it is possible to prevent the rolling roll speed from becoming 0 (zero).
[0047]
[Wedge amount]
　Next, the wedge amount of the steel plate 10 will be described with reference to FIG. 7. FIG. 7 is a cross-sectional view showing an example of the steel plate 10.
　The wedge amount of the steel plate 10 is the difference in thickness between both ends of the steel plate 10. The wedge amount of the steel plate 10 is defined by the following equation (1).
　Wedge amount = | ta-tb | ... (1)
　Here, ta is the thickness of the steel sheet 10 at the position w (mm) from one end in the width direction of the steel sheet 10. tb is the thickness of the steel sheet 10 at the position w (mm) from the other end in the width direction of the steel sheet 10. As w (mm), for example, 25 (mm) is used.
　In the double-roll type continuous casting machine 150, a pair of casting rolls 201 is used to change molten steel into a plate-shaped steel plate 10. Compared with a normal continuous casting machine, the double-roll type continuous casting machine 150 tends to have a large wedge amount because there are many unstable operating elements such as a hot band being easily generated.
[0048]
　When the steel sheet 10 having a large wedge amount passes through the rolling roll 351, a reduction rate difference occurs between one end and the other end in the width direction of the steel sheet 10 having a large wedge amount according to the plate thickness control. , A speed difference occurs between one end and the other end in this width direction. This speed difference causes meandering. Therefore, when the double-roll type continuous casting machine 150, which tends to have a large wedge amount, is used, the speed difference tends to be large, and the meandering tends to be larger than when a normal continuous casting machine is used. When the steel plate 10 meanders, the steel plate 10 comes into contact with the equipment or the like, causing the equipment or the like to break down or the steel plate 10 to be scratched.
　Therefore, when the meandering of the steel sheet 10 occurs, the roll is opened and the portion of the steel sheet 10 having a large wedge amount is waited to pass through the rolling roll 351. Can be avoided.
[0049]
[Tension Control at Roll Opening]
　Next, with reference to FIGS. 8A to 8D, an operation of a casting and rolling system as a comparative example when the roll is released while tension control is being performed will be described. FIG. 8A is a diagram showing a casting roll speed graph showing a time change of the casting roll speed. FIG. 8B is a diagram showing a first pinch roll speed graph showing a time change of the first pinch roll speed. FIG. 8C is a diagram showing a second pinch roll speed graph showing a time change of the second pinch roll speed. FIG. 8D is a diagram showing a rolling roll speed graph showing a time change of the rolling roll speed. The casting and rolling system as a comparative example has the same configuration as the casting and rolling system 1 of the present embodiment. However, unlike the operation of the casting and rolling system 1 of the present embodiment, which will be described later with reference to FIG. 9, in the casting and rolling system as a comparative example, the conveyor control device 550 only controls the tension.
[0050]
　The data of FIGS. 8A to 8D are obtained when casting and rolling are actually performed using a casting and rolling system as a comparative example. In the casting and rolling system as a comparative example, the tension control unit 560 of the first conveyor control device 550A and the tension control unit 560 of the second conveyor control device 550B perform tension control. Further, in the casting and rolling system as a comparative example, the rolling control unit of the rolling gap control device 580 performs rolling control. However, at about 91 (sec), the rolling control unit of the rolling gap control device 580 stops the rolling control, the opening control unit of the rolling gap control device 580 starts the opening control, and the roll is released. Even after the roll is released, the tension control unit 560 continues the tension control.
　Further, as will be described later, at a time of about 93 (sec), the operation of the casting and rolling system 1 is stopped in the casting and rolling system as a comparative example.
[0051]
　As shown in FIGS. 8A to 8D, the casting roll speed, the first pinch roll speed, the second pinch roll speed, and the rolling roll speed are substantially the same until the roll is released. Therefore, it can be said that the plate slip of the steel plate 10 does not occur. The plate slip of the steel plate 10 is a state in which the steel plate 10 is slipping on a roll such as a pinch roll 301.
　The casting roll speed and the rolling roll speed are maintained at positive values ​​even when the rolls are released, as shown from time about 91 (sec) to time about 93 (sec) in FIGS. 8A and 8D. In FIGS. 8A to 8D, the roll is released at a time of about 91 (sec). On the other hand, when the roll is released, the first pinch roll speed and the second pinch roll speed suddenly change and become negative as shown in the vicinity of the time of about 91 (sec) in FIGS. 8B and 8C. Become a value. The fact that the first pinch roll speed and the second pinch roll speed are negative values ​​means that the first pinch roll 301A and the second pinch roll 301B have the steel sheet 10 in the direction opposite to the direction of the rolling mill 350. Indicates that it is rotating in the reverse direction so as to be transported. Here, the steel sheet 10 is conveyed at a speed close to the casting roll speed in the casting and rolling equipment 100, and is always conveyed in the direction of the rolling mill 350 when viewed from the pinch roll 301 in the time zone before and after the roll is released. it is conceivable that. Then, at the moment when the first pinch roll 301A and the second pinch roll 301B rotate in the reverse direction at the time when the roll is released at about 91 (sec), the steel plate 10 is suddenly conveyed in the opposite direction along with the reverse rotation. There is nothing. Therefore, it can be said that the steel plate 10 is slipped in the first pinch roll 301A and the second pinch roll 301B.
[0052]
　It is considered that the steel plate 10 slips due to the roll opening due to the following operation. That is, the tension of the steel sheet 10 fluctuates greatly due to the opening of the roll. At this time, the tension control unit 560 continues the tension control even after the roll is released. Therefore, the tension control unit 560 of the first conveyor control device 550A significantly changes the torque of the first transport motor 303A in order to keep the tension of the steel plate 10 at the first tension. As a result, the rotation speed of the first transport motor 303A fluctuates greatly. As a result, the first pinch roll 301A causes the steel plate 10 to slip. Similarly, the second pinch roll 301B also causes the steel plate 10 to slip.
　Further, as can be seen from the first pinch roll speed graph of FIG. 8B, in the first pinch roll 301A, when the plate slip of the steel plate 10 occurs due to the roll opening, the plate slip of the steel plate 10 continues and the plate slip of the steel plate 10 continues. Is not resolved. Therefore, as shown in FIGS. 8A to 8D, the casting roll speed, the first pinch roll speed, the second pinch roll speed, and the rolling roll speed are all 0 (zero) at the latest at time 95 (sec). ), And the operation of the casting and rolling system 1 is stopped.
　When the sheet slip of the steel sheet 10 occurs, the tension cannot be controlled and the steel sheet 10 cannot be rolled normally. In addition, the roll may be scratched due to the slippage of the steel plate 10. Therefore, even if the plate slip of the steel plate 10 occurs when the roll is opened, it is necessary to eliminate the plate slip of the steel plate 10 in a short time.
[0053]
[Control Processing]
　Next, the control processing of the present embodiment will be described with reference to FIG. FIG. 9 is a flowchart showing an example of control processing. By the control process of this embodiment, the plate slippage of the steel plate 10 can be eliminated in a short time. The control process of FIG. 9 is executed by the main control device 500.
　In S100, the processing management unit 517 acquires various parameters of the casting and rolling equipment 100 by referring to the storage device 502 or receiving information from an external device by network communication. Then, the processing management unit 517 initially sets the casting and rolling equipment 100 so as to perform operations corresponding to the acquired various parameters. The various parameters acquired by the processing management unit 517 include the first tension, the first tension range, the first tension determination time, the second tension, the second tension range, the second tension determination time, the first speed, and the first, which have already been described. 1 speed range, 1st speed determination time, 2nd speed, 2nd speed range, 2nd speed determination time, 1st rolling roll gap, 2nd rolling roll gap and the like are included.
　Further, the first control unit 510 controls the casting and rolling equipment 100 to perform casting and rolling. At this time, the first control unit 510 controls the rolling control unit of the rolling gap control device 580 to perform rolling control by transmitting a command to the rolling gap control device 580 via the communication interface 503. Further, the first control unit 510 transmits a command to the first carrier control device 550A and the second carrier control device 550B via the communication interface 503, so that the tension control unit of the first carrier control device 550A The 560 controls the tension control, and the tension control unit 560 of the second conveyor control device 550B controls the tension control. Further, the first control unit 510 controls the speed control unit of the rolling speed control device 570 to perform speed control by transmitting a command to the rolling speed control device 570 via the communication interface 503.
[0054]
　In S101, the processing management unit 517 controls to start the processing of S102, S103, and S104 in parallel.
　In S102, the abnormality determination unit 514 determines whether or not the steel plate 10 is meandering based on the meandering amount obtained from the meandering total 254. The abnormality determination unit 514 determines that the steel plate 10 is meandering when the meandering amount continuously exceeds the meandering amount range during the meandering determination time. The meandering amount range is determined in advance by experiments or the like as a range that satisfies conditions such as the steel plate 10 not coming into contact with equipment or the like. The meandering determination time is for preventing erroneous detection of meandering of the steel plate 10, and is determined in advance by an experiment, a simulation, or the like. When the abnormality determination unit 514 determines that the steel plate 10 is meandering, the process proceeds to S105, and when it is determined that the steel plate 10 is not meandering, S102 is executed again.
[0055]
　In S103, the abnormality determination unit 514 determines whether or not the hot band 13 is generated based on the current flowing through the rolling motor 354. As described above, the abnormality determination unit 514 continuously determines that the hot band 13 is generated when the current of the rolling motor 354 exceeds the current threshold value I1 during the hot band determination time T1. .. The abnormality determination unit 514 may acquire the current flowing through the rolling motor 354 from the rolling speed control device 570, or may acquire the current flowing through the rolling motor 354 from an ammeter that measures the current of the rolling motor 354. When the abnormality determination unit 514 determines that the hot band 13 has occurred, the process proceeds to S105, and when it is determined that the hot band 13 has not occurred, the abnormality determination unit 514 executes S103 again.
[0056]
　In S104, the abnormality determination unit 514 determines whether or not the operator has given the opening instruction based on the operator's operation received by the input device 504 included in the main control device 500, the information received from the external device, and the like. When the abnormality determination unit 514 determines that the operator has given the release instruction, the process proceeds to S105, and when it is determined that the operator has not given the release instruction, S104 is executed again.
[0057]
　In S105, when the process proceeds to S105 from at least one of S102, S103, and S104, the abnormality determination unit 514 advances the process to S106. The process management unit 517 stops the running process of S102, S103, and S104 when at least one of S102, S103, and S104 is executed when the process proceeds to S105. Take control.
　In S106, the processing management unit 517 controls to start the processing of S107, S108, and S109 in parallel.
[0058]
　In S107, the second control unit 511 controls to change the control method of the first pinch roll 301A from tension control to speed control. More specifically, the second control unit 511 transmits a command to the first carrier control device 550A via the communication interface 503, so that the speed control unit 561 of the first carrier control device 550A controls the speed. Control to start. After that, the second control unit 511 advances the process to S110.
　In S108, the second control unit 511 controls to change the control method of the second pinch roll 301B from tension control to speed control. More specifically, the second control unit 511 transmits a command to the second carrier control device 550B via the communication interface 503, so that the speed control unit 561 of the second carrier control device 550B controls the speed. Control to start. After that, the second control unit 511 advances the process to S110.
　In S109, the second control unit 511 controls to release the roll. More specifically, the second control unit 511 controls the opening control unit of the rolling gap control device 580 to start the opening control by transmitting a command to the rolling gap control device 580 via the communication interface 503. .. As a result, the roll is released. After that, the second control unit 511 advances the process to S110.
[0059]
　In S110, the processing management unit 517 advances the processing to S111 after the processing of S107, S108, and S109 is completed.
　In S111, the processing management unit 517 controls to start the processing of S112, S113, and S114 in parallel.
　In S112, the speed determination unit 515 determines whether or not the first standby time has elapsed since the processing of S107 was performed. The first standby time is the time from when the roll is released and the speed control is started until the first pinch roll speed and the second pinch roll speed are stabilized by the speed control, and is determined by conducting an experiment or a simulation in advance. Be done. The first waiting time is shown as TFr in FIGS. 10B and 10C described later. When the speed determination unit 515 determines that the first waiting time has elapsed since the processing of S107 has been performed, the process proceeds to S115, and when it is determined that the first waiting time has not elapsed, S112 is pressed again. Run.
[0060]
　In S113, the speed determination unit 515 determines whether or not the first pinch roll speed is stable at the first speed. As described above, the speed determination unit 515 determines that the first pinch roll speed is the first speed when the first pinch roll speed is continuously included in the first speed range during the first speed determination time. Judge as stable. The speed determination unit 515 acquires the first pinch roll speed from, for example, the first conveyor control device 550A. When the speed determination unit 515 determines that the first pinch roll speed is stable at the first speed, the process proceeds to S115, and when it is determined that the first pinch roll speed is not stable at the first speed, S113 again. To execute. The first speed, the first speed range, and the first speed determination time are shown as V1, R1, and TV1 in FIG. 10B, which will be described later, respectively.
[0061]
　In S114, the speed determination unit 515 determines whether or not the second pinch roll speed is stable at the second speed. As described above, the speed determination unit 515 determines that the second pinch roll speed is the second speed when the second pinch roll speed is continuously included in the second speed range during the second speed determination time. Is judged to be stable. The speed determination unit 515 acquires the second pinch roll speed from, for example, the second conveyor control device 550B. When the speed determination unit 515 determines that the second pinch roll speed is stable at the second speed, the process proceeds to S115, and when it is determined that the second pinch roll speed is not stable at the second speed, S114 is performed again. To execute. The second speed, the second speed range, and the second speed determination time are shown as V2, R2, and TV2 in FIG. 10C, which will be described later, respectively.
　In the above S112, S113, and S114, the speed determination unit 515 performs a process of waiting until the first pinch roll speed and the second pinch roll speed are stabilized by the speed control.
[0062]
　In S115, the processing management unit 517 advances the processing to S116 after the processing of S112, S113, and S114 is completed.
　In S116, the third control unit 512 controls the light reduction control unit of the rolling gap control device 580 to start the light reduction control by transmitting a command to the rolling gap control device 580 via the communication interface 503. As a result, the rolling mill 350 starts the process of lightly rolling the steel sheet 10. Abnormality of the steel plate 10 such as the hot band 13 of the steel plate 10 and the portion where the wedge amount of the steel plate 10 is large, which causes the meandering of the steel plate 10, between the time when the roll is released in S109 and the time when the light rolling starts in S116. It is considered that the portion passes through the rolling roll 351. If an abnormal portion of the steel sheet 10 remains between the time when the roll is released in S109 and the time when the light reduction starts in S116, after the processing of S126 or S127, S109 and subsequent steps are executed again and the roll is performed. S116 is executed after the pinch roll speed is stabilized after being released. Therefore, in the end, all the abnormal portions of the steel sheet 10 pass through the rolling roll 351.
　In S117, the process management unit 517 controls to start the processes of S118 and S119 in parallel.
[0063]
　In S118, the third control unit 512 controls to change the control method of the first pinch roll 301A from speed control to tension control. More specifically, the third control unit 512 transmits a command to the first carrier control device 550A via the communication interface 503, so that the tension control unit 560 of the first carrier control device 550A controls the tension. Control to start. After that, the third control unit 512 advances the process to S120.
　In S119, the third control unit 512 controls to change the control method of the second pinch roll 301B from speed control to tension control. More specifically, the third control unit 512 transmits a command to the second carrier control device 550B via the communication interface 503, so that the tension control unit 560 of the second carrier control device 550B controls the tension. Control to start. After that, the third control unit 512 advances the process to S120.
　In S120, the processing management unit 517 advances the processing to S121 after the processing of S118 and S119 is completed.
[0064]
　In S121, the processing management unit 517 controls to start the processing of S122, S123, and S124 in parallel.
　In S122, the tension determination unit 516 determines whether or not the second standby time has elapsed since the processing of S118 was performed. The second standby time is the time from the start of tension control until the rear surface tension of the first pinch roll 301A and the rear surface tension of the second pinch roll 301B stabilize, and is determined by performing experiments and simulations in advance. .. When the tension determination unit 516 determines that the second waiting time has elapsed since the processing of S118 was performed, the process proceeds to S125, and when it is determined that the second waiting time has not elapsed, S122 is again pressed. Run.
[0065]
　In S123, the tension determination unit 516 determines whether or not the rear surface tension of the first pinch roll 301A is stable at the first tension. As described above, the tension determination unit 516 of the first pinch roll 301A determines that the rear surface tension of the first pinch roll 301A is continuously within the first tension range during the first tension determination time. It is determined that the rear surface tension is stable at the first tension. The tension determination unit 516 calculates and uses the rear surface tension of the first pinch roll 301A based on, for example, the output of an ammeter that measures the current of the first conveyor motor 303A. When the tension determination unit 516 determines that the rear surface tension of the first pinch roll 301A is stable at the first tension, the process proceeds to S125, and when it is determined that the first tension is not stable, the tension determination unit 516 executes S123 again. ..
　In S124, the tension determination unit 516 determines whether or not the rear surface tension of the second pinch roll 301B is stable at the second tension. As described above, the tension determination unit 516 of the second pinch roll 301B receives the second tension roll 301B when the rear surface tension of the second pinch roll 301B continues to be in the second tension range during the second tension determination time. It is determined that the rear surface tension is stable at the second tension. The tension determination unit 516 calculates and uses the rear surface tension of the second pinch roll 301B based on, for example, the output of an ammeter that measures the current of the second conveyor motor 303B. When the tension determination unit 516 determines that the rear surface tension of the second pinch roll 301B is stable at the second tension, the process proceeds to S125, and when it is determined that the second tension is not stable, the tension determination unit 516 executes S124 again. ..
　In the above S122, S123, and S124, the tension determination unit 516 performs a process of waiting until the tension of the steel sheet 10 is stabilized by the tension control.
[0066]
　In S125, the processing management unit 517 advances the processing to S126 after the processing of S122, S123, and S124 is completed.
　In S126, the abnormality determination unit 514 determines whether or not the steel plate 10 is meandering based on the meandering amount obtained from the meandering total 254 in the same manner as in S102. When the abnormality determination unit 514 determines that the steel sheet 10 is meandering, the process returns to S106, and when it is determined that the steel sheet 10 is not meandering, the process proceeds to S127.
[0067]
　In S127, the abnormality determination unit 514 determines whether or not the hot band 13 is generated based on the current flowing through the rolling motor 354 in the same manner as in S103. When the abnormality determination unit 514 determines that the hot band 13 has occurred, the process returns to S106, and when it determines that the hot band 13 has not occurred, the process proceeds to S128.
　In S128, the third control unit 512 controls the rolling control unit of the rolling gap control device 580 to restart the rolling control by transmitting a command to the rolling gap control device 580 via the communication interface 503. As a result, the rolling mill 350 resumes the process of rolling the steel sheet 10. After that, the process management unit 517 ends the process of FIG.
[0068]
[Operation Example]
　Next, an operation example of the control process of FIG. 9 will be described with reference to FIGS. 10A to 10D. FIG. 10A is a diagram showing a casting roll speed graph showing a time change of the casting roll speed. FIG. 10B is a diagram showing a first pinch roll speed graph showing a time change of the first pinch roll speed. FIG. 10C is a diagram showing a second pinch roll speed graph showing a time change of the second pinch roll speed. FIG. 10D is a diagram showing a rolling roll speed graph showing a time change of the rolling roll speed.
　V1, R1, and TV1 in FIG. 10B are the first speed, the first speed range, and the first speed determination time, respectively, which have already been described. V2, R2, and TV2 of FIG. 10C are the second speed, the second speed range, and the second speed determination time already described, respectively. Further, TFr in FIGS. 10B and 10C is the first standby time already described.
[0069]
　In the operation example shown in FIGS. 10A to 10D, the operator gives an opening instruction, and at a time of about 148.6 (sec), the roll is released by the process of S109 of FIG. At this time, as shown in the first pinch roll speed graph of FIG. 10B and the second pinch roll speed graph 622 of FIG. 10C, in S107 and S108 of FIG. 9, the control method of the pinch roll 301 is changed from tension control to speed control. Is changed to.
　After that, when it is determined in the processing of S112, S113, and S114 that the pinch roll speed is stable by the speed control, the control method of the pinch roll 301 is changed from the speed control to the tension control in S118 and S119.
[0070]
　The casting roll speed and the rolling roll speed are maintained at positive values ​​before and after the roll release, as shown in FIGS. 10A and 10D near the roll opening time of about 148.5 (sec). On the other hand, as shown in FIGS. 10B and 10C around the time when the roll is released at about 148.5 (sec), the first pinch roll speed and the second pinch roll speed suddenly increase before and after the roll is released. It changes and changes from a positive value to a negative value. Therefore, as in the operation example described with reference to FIGS. 8A to 8D, immediately after the roll is released, the steel plate 10 slips in the first pinch roll 301A and the second pinch roll 301B. It can be said that there is.
　However, since the speed control is started when the roll is released, the first pinch roll speed and the second pinch roll speed are the casting roll speed and the rolling roll within 0.5 (sec) after the roll is released. It is the same speed as the speed. Therefore, it can be said that the sheet slippage of the steel sheet 10 is eliminated within 0.5 (sec) after the roll is opened.
[0071]
　After that, even after the tension control is started, the first pinch roll speed and the second pinch roll speed are maintained at the same speeds as the casting roll speed and the rolling roll speed. Therefore, normal rolling is possible.
　As described above, by the control process of FIG. 9, even when the roll is opened, the plate slippage of the steel plate 10 is eliminated in a short time. Then, unlike the operation of the casting and rolling system as a comparative example described with reference to FIGS. 8A to 8D, in the casting and rolling system 1 of the present embodiment, normal rolling can be resumed even after the roll is released.
[0072]
[Effect] When
　rolling is continued when an abnormality occurs in the steel sheet 10, as described above, the rolling roll speed becomes 0 (zero) and rolling is stopped, or the steel sheet 10 becomes a device or the like due to the meandering of the steel sheet 10. The equipment etc. may break down due to contact with. Further, when the end portion of the steel sheet 10 in the width direction comes into contact with the equipment or the like due to the meandering of the steel sheet 10, the steel sheet 10 may be bent and rolling cannot be continued. Therefore, unsteady work such as work for restarting rolling and work for repairing equipment and the like is required. Therefore, the rolling of the steel sheet 10 cannot be continued stably.
　On the other hand, in the present embodiment, when an abnormality occurs in the steel sheet 10, the roll is released by the opening control. Therefore, it is possible to prevent the rolling from stopping or the equipment or the like from breaking down, and it becomes possible to stably continue the rolling of the steel sheet 10.
[0073]
　Further, if the tension control is continued when the roll is released, the steel plate 10 slips on the pinch roll 301 as described above. And this board slip continues without being resolved. Therefore, the pinch roll 301 is flawed, unsteady work such as replacement of the pinch roll 301 is required, and rolling needs to be stopped. Therefore, the rolling of the steel sheet 10 cannot be continued stably. Further, if the sheet slip of the steel sheet 10 continues, the tension cannot be controlled and the steel sheet 10 cannot be rolled normally.
　On the other hand, in the present embodiment, after the roll is released, the control method of the pinch roll 301 is changed from tension control to speed control. Therefore, as described above, the plate slippage of the steel plate 10 can be eliminated, and the occurrence of unsteady work such as replacement of the pinch roll 301 can be suppressed. Therefore, the rolling of the steel sheet 10 can be stably continued.
　Further, in the present embodiment, the third control unit 512 controls the rolling gap control device 580 to restart the rolling control after the conveyor control device 550 restarts the tension control. Therefore, rolling is automatically restarted. Therefore, the rolling of the steel sheet 10 can be stably continued.
[0074]
　Further, the double-roll type continuous casting machine 150 discharges the steel plate 10 to the conveyor 300. Here, if an abnormality occurs in the steel sheet 10 and the rolling is continued, the rolling is stopped as described above. Therefore, the steel sheet 10 cannot be conveyed, and it is necessary to stop the double-roll type continuous casting machine 150. When the double-roll type continuous casting machine 150 is used, in the production of the steel sheet, the double-roll type continuous casting machine 150 to the winding of the steel sheet 10 after hot rolling are continuously performed, and the pair of casting rolls 201 are used. There is molten steel in, and rapid cooling is performed. Therefore, the molten steel between the pair of casting rolls 201 has a high solid ratio in the solid-liquid coexistence state. If the twin roll type continuous casting machine 150 is stopped in this state, the molten steel solidifies in the hot water pool 210 or between the pair of casting rolls 201. In order to remove the solidified molten steel, it is necessary to clean the hot water pool 210, check and clean the sticking state of the steel between the pair of casting rolls 201, and it takes a lot of time for unsteady work such as these. However, in the present embodiment, even if an abnormality occurs in the steel sheet 10, the transfer of the steel sheet 10 does not stop. This eliminates the need for unsteady work to remove the solidified molten steel. Therefore, the rolling of the steel sheet 10 can be stably continued.
[0075]
　Further, the third control unit 512 controls so that the tension control is restarted after the rolling gap control device 580 is controlled to perform the light reduction control. Therefore, when the tension control is resumed, the rolling roll 351 lightly reduces the steel sheet 10. Therefore, tension can be applied to the steel plate 10 between the pinch roll 301 and the rolling roll 351 by tension control.
[0076]
　Further, when it is determined that there is an abnormality in the steel sheet 10 after the tension control is restarted by the control by the third control unit 512, the second control unit 511 controls the rolling gap control device 580 to perform the opening control. The conveyor control device 550 controls the speed control. Therefore, the rolling control is not restarted until the abnormality in the steel sheet 10 is resolved. Therefore, when the rolling control is restarted, normal rolling can be reliably performed.
[0077]
　Further, when the abnormality determination unit 514 determines that the steel plate 10 is meandering, or at least when it is determined that the steel plate 10 has an abnormal thickness variation, the steel plate 10 has an abnormality. Judge that there is. Therefore, in the casting and rolling system 1, it is possible to reliably detect an abnormality in the steel sheet 10 that is usually assumed.
[0078]
　Further, the abnormality determination unit 514 determines whether or not the hot band 13 is generated in the steel plate 10 based on the current of the rolling motor 354. Therefore, it is possible to perform a simple process for determining the occurrence of the hot band 13.
[0079]
　Further, the speed determination unit 515 states that when the first pinch roll speed continues to be in the first speed range during the first speed determination time, the first pinch roll speed becomes stable at the first speed. judge. Further, the speed determination unit 515 states that when the second pinch roll speed continues to be in the second speed range during the second speed determination time, the second pinch roll speed becomes stable at the second speed. judge. Therefore, it is possible to prevent erroneous detection that the pinch roll speed is stable.
[0080]
[Modification Example] In the
　above embodiment, the tension determination unit 516 controls the rear surface tension of the conveyor 300. However, the tension determination unit 516 may be configured to control the front tension of the conveyor 300. This is the tension of the steel plate 10 on the front side of the conveyor 300 (the side opposite to the traveling direction of the steel plate 10).
　The casting and rolling equipment 100 includes two conveyors 300, but the conveyors 300 may be one or three or more.
　Further, in the above embodiment, the main control device 500 includes an input device 504. However, the carrier control device 550 may include an input device that receives input from the operator. When the carrier control device 550 receives the opening instruction by the operator via the input device, the carrier control device 550 transmits information to the effect that the opening instruction has been received to the main control device 500. Then, in S104 of FIG. 9, the abnormality determination unit 514 of the main control device 500 determines that the operator has given the opening instruction based on the information received from the conveyor control device 550. At least one of the rolling speed control device 570 and the rolling gap control device 580 may include an input device that receives input from the operator.
[0081]
　Although the present invention has been described above with the embodiments, the above-described embodiments are merely examples of embodiment of the present invention, and the technical scope of the present invention is construed in a limited manner by these. It must not be. That is, the present invention can be implemented in various forms without departing from the technical idea or its main features.
Industrial applicability
[0082]
　According to the present invention, rolling can be continued stably.
Code description
[0083]
1 Casting and rolling system
100 Casting and rolling equipment
101 Control system
150 Double-roll type continuous casting machine
300 Conveyor
350 Roller
400 Looper
450 Coiler
500 Main control device
550 Conveyor control device
570 Rolling speed control device
580 Rolling gap control device
The scope of the claims
[Claim 1]
　It has a twin-roll type continuous casting machine, a rolling machine that rolls a steel plate with a pair of rolling rolls, and a transporter that conveys the steel plate in the direction of the rolling mill with a pair of transfer rolls. The casting machine comprises a pair of casting rolls that rotate in opposite directions, and the pair of the casting rolls cools, cooled and solidified the molten steel injected into the upper pool between the pair of the casting rolls. The molten steel is pressure-welded to discharge the steel plate from between the pair of casting rolls, and the conveyor transports the steel plate discharged from the twin-roll continuous casting machine in the direction of the rolling mill. A control system for equipment
　that includes rolling control for rolling the steel plate with a defined roll gap and open control for controlling at least one of the pair of rolling rolls so that they do not come into contact with the steel plate. A rolling mill control unit that controls the rolling mill
　, tension control for transporting the steel plate at a predetermined tension, and speed control for transporting the steel plate at a predetermined rotation speed for the transport roll. A first control in which a transporter control unit that controls the conveyor and a
　rolling mill control unit control the rolling control by any of the controls including, and the conveyor control unit controls the tension control.
　When it is determined that there is an abnormality in the steel plate when the rolling control and the tension control started by the control of the unit and the first control unit are performed, the rolling mill control unit controls the opening. A second control unit that controls to perform the rolling mill and controls the conveyor control unit to perform the speed control.
　When the transfer roll is determined to be stable at the predetermined rotation speed by the speed control started by the control by the second control unit, the transfer machine control unit controls to restart the tension control, and the above-mentioned A control system including a third control unit that controls the rolling mill control unit to restart the rolling control.
[Claim 2]
　The rolling mill control unit controls the rolling mill by any of the control including the rolling control, the opening control, and the light rolling control in which the roll gap is made larger than the defined roll gap and the steel sheet is lightly rolled. When
　it is determined that the pair of transport rolls are stable at the predetermined rotation speed by the speed control that is controlled and started by the control by the second control unit, the third control unit is the rolling mill control unit. 1. Controls to perform the light reduction control, then the conveyor control unit controls to restart the tension control, and then the rolling mill control unit controls to restart the rolling control. The control system described.
[Claim 3]
　When it is determined in the speed control started by the control by the second control unit that the pair of transfer rolls are stable at the predetermined rotation speed, the rolling mill control unit is the lighter in the third control unit. Control to perform rolling control, then the conveyor control unit controls to restart the tension control, and then when it is determined that there is no abnormality in the steel sheet, the rolling mill control unit controls the rolling. When
　it is controlled to restart and it is determined that there is an abnormality in the steel sheet after the tension control is restarted by the control by the third control unit, or when the rolling control is started by the control by the first control unit. When it is determined that the steel sheet has an abnormality while the tension control is being performed, the second control unit controls the rolling mill control unit to perform the opening control, and the conveyor control unit controls the opening control. The control system according to claim 2, wherein the speed control is performed.
[Claim 4]
　When it is determined that the steel sheet is meandering, or at least when it is determined that the steel sheet has an abnormal thickness variation, the abnormality determination unit for determining that the steel sheet is abnormal is used. Further, when the
　rolling control and the tension control started by the control by the first control unit are performed and the abnormality determination unit determines that the steel sheet has an abnormality, the second control The control system according to any one of claims 1 to 3, wherein the rolling mill control unit controls the rolling mill control unit to perform the opening control, and the conveyor control unit controls the speed control unit.
[Claim 5]
　The control system according to claim 4, wherein the abnormality determination unit determines whether or not an abnormal plate thickness variation has occurred in the steel plate based on the current of an electric motor that rotates the rolling roll.
[Claim 6]
　Further, a speed determination unit for determining that the transfer roll is stable at the specified rotation speed when the rotation speed of the transfer roll is continuously included in the specified range for a specified time. has,
　after the speed control is started by the control by the second control unit, when the conveyor rolls by the speed determination unit determines stabilized at a rotational speed defined above, the third control unit, The control system according to any one of claims 1 to 5, wherein the conveyor control unit controls to restart the tension control, and the rolling machine control unit controls to restart the rolling control.
[Claim 7]
　A double-roll type continuous casting machine, a rolling machine that rolls a steel plate with a pair of rolling rolls, a transport machine that transports the steel plate in the direction of the rolling mill with a pair of transport rolls, and the steel plate with a predetermined roll gap. A rolling mill control unit that controls the rolling mill and the steel plate are defined by either rolling control for rolling or control including opening control for controlling at least one of the pair of rolling rolls from contacting the steel plate. A transporter control unit that controls the transporter by either a tension control for transporting the steel plate at a high tension or a control including a speed control for transporting the steel plate at a predetermined rotation speed. The twin-roll continuous casting machine includes a pair of casting rolls that rotate in opposite directions to each other, and the pair of the casting rolls is injected into an upper pool between the pair of the casting rolls. The molten steel is cooled, the molten steel that has been cooled and solidified is pressure-welded, and the steel plate is discharged from between the pair of the casting rolls. A first control method for controlling a casting and rolling equipment to be conveyed in the direction of the rolling mill,
　wherein the rolling mill control unit controls the rolling control and the conveyor control unit controls the tension control.
　When it is determined that there is an abnormality in the steel plate when the rolling control and the tension control started by the step and the control by the first control step are performed, the rolling mill control unit controls the opening. In the second control step in which the transfer machine control unit controls the speed control, and the speed control
　started by the control by the second control step, the transfer roll is rotated at the predetermined rotation speed. A control method including a third control step in which the conveyor control unit controls to restart the tension control and the rolling mill control unit controls to restart the rolling control when it is determined to be stable.
[Claim 8]
　A double-roll type continuous casting machine, a rolling machine that rolls a steel plate with a pair of rolling rolls, a transport machine that transports the steel plate in the direction of the rolling mill with a pair of transport rolls, and the steel plate with a predetermined roll gap. A rolling mill control unit that controls the rolling mill and the steel plate are defined by either rolling control for rolling or control including opening control for controlling at least one of the pair of rolling rolls from contacting the steel plate. A transporter control unit that controls the transporter by either a tension control for transporting the steel plate at a high tension or a control including a speed control for transporting the steel plate at a predetermined rotation speed. The twin-roll continuous casting machine includes a pair of casting rolls that rotate in opposite directions to each other, and the pair of the casting rolls is injected into an upper pool between the pair of the casting rolls. The molten steel is cooled, the molten steel that has been cooled and solidified is pressure-welded, and the steel plate is discharged from between the pair of the casting rolls. A control device that controls a casting and rolling equipment that is conveyed in the direction of the rolling mill,
　wherein the rolling mill control unit controls the rolling control, and the conveyor control unit controls the tension control. a first controller,
　if said rolling control started in the control by the first control unit and the tension control has been determined that there is an abnormality in the steel sheet when being performed, the rolling mill control section the open A second control unit that controls to control and controls the transfer machine control unit to perform the speed control, and the speed control
　started by the control by the second control unit causes the transfer roll to rotate as defined. A control having a third control unit that controls the conveyor control unit to restart the tension control and the rolling mill control unit to control the rolling control to resume when it is determined that the speed is stable. Device.
[Claim 9]
　A double-roll type continuous casting machine, a rolling machine that rolls a steel plate with a pair of rolling rolls, a transport machine that transports the steel plate in the direction of the rolling mill with a pair of transport rolls, and the steel plate with a predetermined roll gap. A rolling mill control unit that controls the rolling mill and the steel plate are defined by either rolling control for rolling or control including opening control for controlling at least one of the pair of rolling rolls from contacting the steel plate. A transporter control unit that controls the transporter by either a tension control for transporting the steel plate at a high tension or a control including a speed control for transporting the steel plate at a predetermined rotation speed. The twin-roll continuous casting machine includes a pair of casting rolls that rotate in opposite directions to each other, and the pair of the casting rolls is injected into an upper pool between the pair of the casting rolls. The molten steel is cooled, the molten steel that has been cooled and solidified is pressure-welded, and the steel plate is discharged from between the pair of the casting rolls. a program for controlling the casting and rolling equipment for conveying in the direction of the rolling mill,
　the computer,
　the rolling mill control section controls so as to perform the rolling control, the conveyance motor control unit performs the tension control
　When it is determined that there is an abnormality in the steel plate when the rolling control and the tension control started by the first control unit and the control by the first control unit are performed, the rolling mill control A second control unit that controls the unit to perform the opening control and controls the conveyor control unit to perform the speed control.
　When the transfer roll is determined to be stable at the predetermined rotation speed by the speed control started by the control by the second control unit, the transfer machine control unit controls to restart the tension control, and the above-mentioned A program for functioning as a third control unit that controls the rolling mill control unit to restart the rolling control.