0001]The present invention, diagnosis support device of the vacuum degassing vessel, the diagnosis support method, diagnostic method, and a repair method.
　This application, on February 27, 2017, claiming priority on Japanese Patent Application No. 2017-035438 filed in Japan, the contents of which are incorporated herein.
BACKGROUND
[0002]In a series of refining process for the production of clean steel often vacuum degassing treatment by RH method or DH method to molten steel (RH process or DH process) is performed. Vacuum degassing vessel (RH degassing vessel, or DH degassing tank) is used for the vacuum degassing treatment.
[0003]
　1, as an example of the vacuum degassing vessel, shows a cross-sectional view of the RH degassing vessel 100. RH degassing vessel 100 includes the order from top to bottom, an upper tank 101, the middle tank 102, lower tank 103, and the two dip tubes 104. Two of the dip tube 104 extends from the bottom of the lower tank 103 downward, respectively. The inner wall refractory of the immersion tube 104 and the lower tank 103 (hereinafter, also referred to as "refractory lining α".) Composed of. During the RH treatment, the ladle of molten steel to two of the dip tube 104 (not shown) within is immersed, the RH degassing vessel 100 is evacuated. Then, one of the dip tube 104 to the inert gas (eg argon gas) is blown. Thus, as shown by the arrows in the figure, molten steel is raised inside the dip tube 104 while, through the interior of the lower tank 103, to lower the internal of the other dip tube 104.
[0004]
　During RH process, the high temperature of the molten steel flows inside the dip tube 104 and the lower tank 103. Therefore, cracks in the α refractory lining for "lower tank 103 of the dip tube 104 and the vicinity thereof" is likely to progress occur. When the progress of the crack is significant, refractory lining α is falling off. Further, there is a fear that steel shell that covers the dip tube 104 and the lower tank 103 from being damaged by red heat. Separation of refractory lining α leads to contamination of the refractory to the molten steel (oxide). Opening the red-hot and steel shell of the furnace shell, since it results in the introduction of outside air into the RH degassing vessel 100, it leads to a decrease in production and the vacuum degree of the oxide. In short, cracking of refractory lining α can lead to reduced life of degradation of the molten steel and the vacuum degassing vessel, a factor that inhibits the production of clean steel. Note that the refractory Trouble herein is in the open hole of the dropping, the furnace shell red hot and steel shell of the refractory lining alpha.
[0005]
　Cracks due problems of the refractory lining α is also present as well in the DH treatment using DH degassing vessel which have a dip tube 104 only one.
[0006]
　Therefore usually from vacuum degassing prior charge is completed by the vacuum degassing treatment of the trailing charge starts to diagnose the surface properties of the refractory lining alpha, the crack is determined to be repaired spraying repair or pressed repair is performed for. Here, the molten steel from the converter is carried in a fixed time interval in the vacuum degassing vessel. For example, the time from the vacuum degassing of the preceding charge is completed until the vacuum degassing of the trailing charge starts is short (e.g., 15 minutes to 25 minutes). Such a short time to diagnose and surface properties of the refractory lining α of the vacuum degassing vessel, to have been cracked determined that should be repaired be carried out repairs, the continuous operation of the vacuum degassing vessel is required. Such a short time to diagnose and surface properties of the refractory lining alpha, if preferred repaired performed on the Crack determined that should be repaired to stop the continuous operation of the vacuum degassing vessel it without avoiding refractory trouble, the maintenance of the quality of the molten steel (high cleanliness steel of), and, it is possible to realize a life extension of the vacuum degassing vessel, it is possible to improve the efficiency of the vacuum degassing .
[0007]
　Spray repair of these repair methods can be performed in a short time without waiting for the temperature drop of online, i.e. refractory lining alpha. On the other hand, press-repair is a large-scale repair method compared to spray repair requires a few hours time, off-line, i.e. it is necessary to be carried out after the temperature decrease in the refractory lining alpha. Therefore, in order to perform repairs within a short time, it is desirable to perform the spraying repair that allows a shorter time than the press-fitting repair.
[0008]
　In order to perform a diagnosis of the surface properties of the refractory lining α in a short time, it is desirable to perform quickly and detail without cooling the dip tube 104 in a high temperature state immediately after the vacuum degassing treatment. Further, when cooling the refractory lining alpha for the diagnosis, there is a risk that also occur damage by the cooling of the refractory lining alpha. Therefore, to determine the necessity of no repair cooling the refractory lining alpha, it is desirable to select a repair method.
[0009]
　Patent Document 1 is opened the canopy the central portion of the RH degassing furnace, inserted in the furnace observation camera than the dip tube is inserted a spray burner lance into the furnace through the opening, the inner by the furnace observation camera check the damaged portion of Zhang refractories, discloses a spraying method for repairing RH degassing furnace spraying repair the portion of the inner clad refractory by operating the spraying burner lance.
[0010]
　However, when inserting the furnace observation camera to the dip tube of the high-temperature state immediately after RH processing using the techniques disclosed in Patent Document 1, the melt remaining in the RH degassing vessel (eg slag, ground gold) dropwise from the immersion tube there is a risk that the camera may be damaged. In this case, it can not be performed accurately diagnosis. Therefore, in the technique disclosed in Patent Document 1, the waiting time from the dip tube until the melt no longer dripping is required after RH treatment, the efficiency of the vacuum degassing is lowered. In the case of visual observation of the dip tube, from the viewpoint of safety, it must be observed from a distance. In this case, it is difficult to perform accurately diagnosis.
[0011]
　If you do not perform the accurately diagnosis, not only misjudge the necessity determination of repair, misjudge also selection of repair methods. As a result, the refractory trouble occurs, tends to be lowered in the life of the vacuum degassing vessel deterioration of the quality of the molten steel (e.g., mixed into molten steel inclusions from refractory). Further, by stopping the continuous operation of the vacuum degassing vessel, sometimes excessive repair costs conversely occurs.
CITATION
Patent Document
[0012]
Patent Document 1: Japanese Laid-Open Patent Publication No. 6-158145
Summary of the Invention
Problems that the Invention is to Solve
[0013]
　The present invention has been made in view of the above circumstances, the diagnosis support device of the vacuum degassing vessel that can increase the efficiency of the vacuum degassing treatment, diagnosis support method, to provide a diagnostic method, and repair method for the purpose.
Means for Solving the Problems
[0014]
　Overview of the present invention is as follows.
[0015]
(1) the first aspect of the present invention is a diagnostic support apparatus for a vacuum degassing vessel having a dip tube extending downwardly, state from the inner circumferential surface of the dip tube in a plan view is disposed outside in, taking pictures viewed the inner peripheral surface of the dip tube obliquely from below, and a camera for acquiring the image as data, is connected to the camera, an image processing apparatus that performs image processing of the data, the provided.
(2) diagnosis support apparatus described in the above (1) includes a table for fixing the camera, a photographing position of said camera in a plan view is disposed in a position that does not overlap with the inner peripheral surface of the dip tube, a table moving mechanism for moving the table between a retracted position where the camera in plan view is arranged at a position that does not overlap in the vacuum degassing vessel may further comprise a.
(3) In the diagnosis support device according to (2), the table moving mechanism, and a strut extending in the vertical direction, extends horizontally from the strut, pivotally said table about an axis of the strut an arm for supporting a may be provided.
(4) above (2) or diagnosis support apparatus described in (3) is fixed to the table, the camera may further comprise a housing case for housing, at least a portion of the upper surface of the housing case it may be a heat-resistant glass.
(5) The diagnostic support apparatus according to (4), the housing case includes a lid covering at least a portion of said heat-resistant glass, the lid is opened when the table is in the photographing position, said table There may comprise a lid opening and closing mechanism for opening and closing the lid so that the lid is closed when moving.
(6) above (4) diagnosis support device according to, or (5) may further comprise a gas supply mechanism for supplying gas into the housing case.
(7) (4) above diagnosis support device according to any one of - (6), the temperature may be further provided with a thermometer for measuring the inside the housing case.
(8) above (1) to the diagnosis support device according to any one of (7), a camera control for photographing a plurality of images while varying the exposure time of the camera within a range of 5 ms ~ 300 ms parts may further comprise a.
(9) above (1) to the diagnostic aid device according to any one of (8), said camera, said dip tube in a state of being disposed outward from the outer peripheral surface of the dip tube in a plan view the inner peripheral surface of the may be photographed.
(10) above (1) in the diagnosis support device according to any one of - (9), the camera may be arranged in plural and in the central-axis of the dip tube in a plan view.
(11) in the diagnosis support apparatus described in (10), said camera, said inner peripheral surface of the dip tube may be taken over the entire circumference.
(12) above (1) in the diagnosis support device according to any one of - (9), the camera is, of the inner peripheral surface of the dip tube, the center of the vacuum degassing vessel in a plan view the area closest to the axis may be taken.
(13) above (1) in the diagnosis support device according to any one of - (12), the vacuum degassing vessel, the dip tube may be a degassing vessel RH having two.
A second aspect of (14) The present invention, the above (1) to (13) A diagnosis support method of the vacuum degassing vessel with diagnosis support apparatus according to any one of, by said camera wherein said inner peripheral surface of the dip tube capturing an image viewed from obliquely downward, a photographing step of acquiring data, by the image processing apparatus, and the image performs image processing of the data obtained by the photographing step process It has a.
(15) The third aspect of the present invention, the above (1) to (13) a diagnostic method for vacuum degassing vessel using the diagnostic support apparatus according to any one of the by the camera an image viewed the inner peripheral surface of the dip tube obliquely from below photographed, the photographing step of acquiring data, by the image processing apparatus, an image processing step of performing image processing of the data acquired by the photographing step, based on the data subjected to image processing, the presence or absence of cracks in the inner peripheral surface of the dip tube and the cracking specifying step of specifying a length, in accordance with the presence or absence and the length of the crack was identified by the cracking identification step, having a repairing method determination step of determining necessity and repairing method of repairing.
(16) A fourth aspect of the present invention is a repair method for repairing the inner peripheral surface of the dip tube repairing method determined by the repairing method determining step described in the above (15).
Effect of the invention
[0016]
　According to the diagnosis support device of the vacuum degassing vessel according to the above (1) to (13), in a state where the camera is located outside the inner peripheral surface of the dip tube in a plan view, the inner peripheral surface of the dip tube for taking an image viewed obliquely from below, the melt in the camera in even harsh shooting environment in which the melt is dropped taken from the dip tube immediately after the vacuum degassing treatment is not conflict. Therefore, it can be diagnosed quickly and accurately the properties of the inner peripheral surface of the dip tube immediately after the vacuum degassing treatment. Furthermore, after vacuum degassing is complete, it is possible immediately to the time required for measuring the short time can be measured. Thus, without stopping the continuous operation of the vacuum degassing vessel, avoiding refractory trouble, maintaining the quality of the molten steel, and, it is possible to realize a life extension of the vacuum degassing vessel, the efficiency of the vacuum degassing It can be enhanced to become.
[0017]
　According to the diagnostic method of the vacuum degassing vessel according to the diagnosis support method, and the (15) of the vacuum degassing vessel according to (14), the (1) to the diagnosis support device of the vacuum degassing vessel according to (13) the the use, can be diagnosed or diagnostic support to quickly and accurately the properties of the inner peripheral surface of the dip tube immediately after the vacuum degassing treatment. Furthermore, after vacuum degassing is complete, it is possible immediately to the time required for measuring the short time can be measured. Thus, without stopping the continuous operation of the vacuum degassing vessel, avoiding refractory trouble, maintaining the quality of the molten steel, and, it is possible to realize a life extension of the vacuum degassing vessel, the efficiency of the vacuum degassing It can be enhanced to become.
[0018]
　According to the repair method of the vacuum degassing vessel according to the above (16), for repairing the inner peripheral surface of the dip tube in an optimal repair method determined in repairing method determining step described in the above (15), more than necessary It can be avoided to consume the repair time. Therefore, it is possible to increase the efficiency of the vacuum degassing treatment.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019]
FIG. 1 is a cross-sectional view of the RH degassing vessel 100 which is an example of the vacuum degassing vessel.
At the beginning of the FIG. 2] RH treatment "molten steel - temperature difference refractories (℃)" and illustrates a "crack growth rate (mm / CH)", the relationship.
Is a graph showing a relationship [3] and "crack length before the repair (mm)" and "crack growth rate (mm / CH)".
4 is a schematic front view of a diagnosis support apparatus 10 at the time of shooting.
[Figure 5] is a schematic plan view of a diagnosis support apparatus 10 at the time of shooting, shows the RH degassing vessel 100 by a two-dot chain line.
[Figure 6] is a schematic plan view of a diagnosis support apparatus 10 during retraction, showing the RH degassing vessel 100 by a two-dot chain line.
7 is a circumferential wall photographed image of which has been image processed by the image processing apparatus.
[8] diagnosis support apparatus 10 is a schematic view showing a structure of a case comprising a housing case 30 of the camera 11.
Is a flowchart of between [9] after the preceding charge completion and the start of the trailing charge.
DESCRIPTION OF THE INVENTION
[0020]
　The present inventors have found that diagnosis support apparatus capable of enhancing the efficiency of the vacuum degassing treatment, diagnosis support method, intensive studies how to diagnose and repair method.
[0021]
　The present inventors have found that in order to examine the progress of a crack in the refractory lining alpha, using one of the RH degassing vessel, each time the RH process successive charge ends, was captured by the camera. Each time the shooting, to identify the crack occurring on the inner peripheral surface of the dip tube (lining the surface of the refractory alpha), were examined the length of the crack. In addition, conduct spraying repair in some of the charge, the rest of the charge was not carried out a repair.
[0022]
　2, at the start of RH treatment - shows "molten steel temperature difference refractories (℃)" and the "crack growth rate (mm / CH)", the relationship.
　"Molten steel - temperature difference refractories (℃)" means the temperature difference observed when starting the RH degassing treatment of the trailing charge the "temperature of the molten steel," the "temperature of the refractory."
　And "crack growth rate" means the difference between the end of the crack length of crack length and the following charge during the preceding charge termination. Note that the crack length, means a straight distance connecting both ends of the crack.
[0023]
　From Figure 2, - the "molten steel temperature difference refractories (℃)" is more than 50 ° C., it can be seen that the crack propagation begins. That is, crack propagation is dependent on the difference between the temperature of the inner peripheral surface of the temperature and the immersion tube of the molten steel at the start of RH treatment. The longer the time until the start of the trailing charge from the end of the preceding charge, due to the decrease in the temperature of the immersion tube "molten steel - temperature difference refractories (℃)" increases. Therefore, if it is possible to perform promptly diagnosed after the preceding charge termination, - it is possible to prevent the spread of "molten steel temperature difference refractories (℃)". Thus, without stopping the continuous operation of the vacuum degassing vessel, avoiding refractory trouble, maintaining the quality of the molten steel, and, it is possible to realize a life extension of the vacuum degassing vessel, the efficiency of the vacuum degassing it is possible to increase the.
[0024]
　Immediately after the preceding charge completion, particularly from the lower end of the inner peripheral surface of the dip tube to harsh conditions that melt drips, the present inventors have found that performing the imaging by placing the camera obliquely downward dip tube in was found to be able to diagnose the nature of the inner peripheral surface of the dip tube suitable 確且 one quickly. Further, the present inventors have found that performing such photographing, without stopping the continuous operation of the vacuum degassing vessel, avoiding refractory trouble, maintaining the quality of the molten steel, and the life extension of the vacuum degassing vessel It can be realized, and found that it is possible to increase the efficiency of RH degassing treatment.
[0025]
　Furthermore, the present inventors have - as "molten steel temperature difference refractories (℃)" was subjected to numerical analysis in the conditions in the range of 80 ° C. ~ 120 ° C., "repaired before crack length (mm)" the relationship between the "crack growth rate (mm / CH)", was examined and if you did not carry out the case and spray repair carrying out the spray repair. The results are shown in Figure 3.
[0026]
　As shown in FIG. 3, "crack length before the repair (mm)" is the case of 20mm or less, it appears effect by spray repair, crack propagation is suppressed. On the other hand, "crack length before the repair (mm)" may exceed 20 mm, does not appear the effect by spray repair, crack propagation is remarkably. Therefore, although when the length of the crack of 20mm or less is sufficient response by spraying repair, if the length of the crack is more than 20mm are insufficient in response by spraying repair response by press fitting repair Is required.
　Accordingly, until the start of the trailing charge from the end of the preceding charge, with the diagnosis of the inner peripheral surface quickly, a predetermined length (e.g., 20 mm) as long as the missing crack length exceeding the in hot by performing spray repair, while preventing damage to the RH degassing tank according to development of a crack, without stopping the continuous operation of the vacuum degassing vessel, avoiding refractory trouble, maintaining the quality of the molten steel, and the vacuum degassing can achieve the life extension of the vessel, it is possible to improve the efficiency of RH degassing treatment.
　It will be described below with reference to the drawings based on an embodiment of the present invention made of the above findings.
[0027]
(First Embodiment)
　FIG. 4 is a first embodiment the vacuum degassing vessel diagnosis support apparatus according to Embodiment 10 of the present invention (hereinafter, simply referred to as "diagnosis support apparatus 10") and degassing tank RH to be diagnosed it is a schematic front view showing a 100. Further, FIG. 5 is a schematic plan view showing the positional relationship between the diagnosis support apparatus 10 and the RH degassing vessel 100 at the time of shooting.
[0028]
　As shown in FIG. 4, the diagnosis support apparatus 10 and the diagnostic object of the refractory lining α provided on the inner circumferential surface 104a of the two dip tubes 104 of RH degassing vessel 100 described with reference to FIG. 1 to. Diagnosis support apparatus 10 is configured to shoot the inner circumferential surface 104a of the dip tube 104 by a plurality of cameras 11 arranged diagonally below the respective dip tube 104 acquires the image as data, is connected to a plurality of cameras 11 assist diagnosis by performing image processing of the data by the image processing apparatus 17.
[0029]
　Camera 11, in the state at the time of shooting, in correspondence with two of the dip tube 104 is provided by three units. That is, as a whole, six cameras 11 are provided. RH immediately after the degassing treatment, of the dip tube 104, the melt is dropped, especially from the inner peripheral surface 104a. Accordingly, the camera 11, as shown in FIG. 5, in a state in which from the inner circumferential surface 104a provided on the outside of the dip tube 104 in a plan view, the inner peripheral surface of the dip tube 104 obliquely from below of the RH degassing vessel 100 104a to the shooting. Thus, since the melt in the camera 11 at the time of photographing becomes possible to prevent the collision to fall, it is possible to perform promptly taken after RH degassing treatment, improve the efficiency of RH degassing treatment be able to.
[0030]
　In the diagnosis support apparatus 10 of the present embodiment, a plurality of cameras 11 are arranged obliquely downward of the dip tube 104. That is, the camera 11 is disposed at a position deviated from immediately below the dip tube 104. Therefore, from the dip tube 104 during shooting by falling melt hot, it is not that the melt strikes the camera 11. This prevents damage to the camera 11.
[0031]
　Of dip tube 104, from the bottom surface 104c between the inner circumferential surface 104a and the outer peripheral surface 104b, sometimes melt drips. Therefore, in order to prevent the collision of the melt to the camera 11 when more reliably captured, the camera 11, it is preferred to carry out the photographing in a state which is provided outside the outer peripheral surface 104b of the dip tube 104 in a plan view . Meanwhile, when the radius of the outer peripheral surface 104b in a plan view is r, if the camera 11 is provided at a position spaced beyond the 2 × r in the horizontal direction from the center axis of the dip tube 104, the inner peripheral surface of the dip tube 104 shooting range 104a the upper end side of the narrows. Accordingly, the camera 11 at the time of photographing, in a plan view, it is preferably provided in a position not away from the central axis of the dip tube 104 beyond the 2 × r.
[0032]
　In the diagnosis support apparatus 10, to one of the dip tube 104, the three cameras 11 are arranged at equal angular intervals around the center axis of the dip tube 104 obliquely downward in the dip tube 104. Thus, by the three cameras 11, the inner circumferential surface 104a of the dip tube 104 (the surface of the concrete refractory lining alpha) can be taken over the entire circumference region.
[0033]
　In order to perform a diagnosis over the entire circumference region of the inner peripheral surface 104a is preferably photographed from different directions by using three or more cameras 11 to one of the dip tube 104. However, in order to reduce the diagnosis time, one of the immersion tube 104 to set up a single or two cameras 11, it may be diagnosed only some areas of the entire circumference region of the inner circumferential surface 104a .
[0034]
　Of the inner circumferential surface 104a of the dip tube 104, in the area close to the center axis of the RH degassing vessel 100 in a plan view, there is a tendency that cracked. Accordingly, one or more cameras 11 is preferably placed in a position that can shoot this point.
[0035]
　As shown in FIG. 4, the cameras 11 are arranged so as to be obliquely upward, it is preferable that the optical axis is inclined from the central axis of the dip tube 104. In this case, by the cameras 11, it may be taken from the lower end of the inner peripheral surface 104a of a single dip tube 104 to the upper end at a time. Thus, by the three cameras 11, it may be taken over the entire inner peripheral surface 104a of a single dip tube 104.
[0036]
　The image processing apparatus 17 is connected to the camera 11 by a wiring or the like (not shown). The image processing apparatus 17 monitor 19 is connected. The image processing apparatus 17 and the monitor 19, away from the RH degassing vessel 100: installed in (Example operation room). The image processing apparatus 17, to the data of the photographed image of the inner circumferential surface 104a of the dip tube 104 from the camera 11, performs image processing. Then, the image processing apparatus 17 displays the image on the monitor 19. Thus, to determine the crack can identify cracks and their lengths.
[0037]
　When the inner circumferential surface 104a of the dip tube 104 is captured, the dip tube 104 is a high-temperature state immediately after RH treatment, refractory lining of the dip tube 104 alpha are self-luminous by the radiation. As a result, it performs the shooting even without lighting. At that time, part of the crack is self light emission is particularly strong, not healthy part of the On the other hand crack is self-luminous is weak. In addition, there is also a shadow appears that a portion of the crack. Irregularities between the crack portion and the refractory surface of the surrounding is because occurs. Accordingly, the captured image, the portion of the crack is brighter or darker display than healthy parts.
[0038]
　The image processing apparatus 17, to the data of the photographed image from the camera 11, performs image processing so that brightness of the image is clear. Then, the image processing apparatus 17 displays the image on the monitor 19. Therefore, to determine the crack from contrast of the image can be identified. Of course, it is also possible to identify the crack length. At that time, image analysis is performed by the image processing apparatus 17, it is also possible to the crack length is calculated.
Figure 7 is a photographic image of the peripheral wall 104a which is an image processing by the image processing apparatus 17. In the example shown in FIG. 7, a shadow in the circumferential direction of the inner peripheral wall 104a extending linearly it can be confirmed visually, which can be identified as a crack. In particular, if the worker has sufficient experience for repairing hot RH gas tank, an image captured by the camera 11 by visually confirmed, it can be easily discriminated to identify the presence or absence of cracks. Similarly, the camera 11 at the time of shooting is fixed, and RH for the dimensions of the degassing vessel is the same, such as by comparing the image taken by pasted and scale degassing vessel RH cold state the method, from the captured image, it is possible to easily measure the length of the crack.
Incidentally, because it can contour also determined inevitably refractory lining alpha, it can also be specified melting condition of refractory lining alpha.
　Therefore, surface properties (presence or absence of cracks, the crack length) of refractory lining α of immersion tube 104 can be diagnosed in accurately and necessity determination of repair, and the repair selection method (specifically, online spraying repair, or offline press fitting repair) can be appropriately performed.
[0039]
　Well known as a camera 11 (eg: CCD camera, CMOS camera) may be applied. Also, well known as an image processing apparatus 17 (e.g. a personal computer) may be applied. It may be applied well known as a monitor 19. However, in general, the average particle diameter of the aggregate of the refractory lining α is about 3 ~ 5 mm. The average particle size of repair materials used in the repair of cracks is about 1 mm. For these reasons, it is desirable to be able to determine the length of a crack of about minimum 1 mm. Thus, as can determine the length of a crack of about minimum 1 mm, the camera 11, the performance of the image processing apparatus 17 and the monitor 19 (the number of pixels, resolution) it is desirable to select.
[0040]
　Subject of the camera 11 is a refractory lining of a high temperature state immediately after RH processing (self-light emitting state) alpha. Therefore, the camera 11 is preferably refractory lining is subject alpha (inner circumferential surface 104a of the dip tube 104) has a performance capable shooting when the self-luminous state by heat. Temperature of the object of the self-light emitting state is, for example, 500 ℃ ~ 1700 ℃.
[0041]
　The inner peripheral surface 104a of the dip tube 104 just after RH degassing treatment, self-luminous and since that, the inner peripheral surface 104a only once photographed depending on the relationship of the luminance of the setting and the subject of the exposure time of the camera 11 by the radiation there is a case in which the presence or absence of crack can not be determined to accurately. Therefore, diagnosis support apparatus 10 preferably comprises a camera control unit for the exposure time of the camera 11 is varied by shooting to control the camera 11 to perform a plurality of times of photographing. For example, while changing each other within the range of 5 ms ~ 300 ms exposure time by taking a plurality of images in each camera 11, by using selected what could properly photographed from them accurately diagnosis it is possible to perform. If refractory lining of a high temperature state immediately after RH processing α is subject, for example, it is preferable to carry out 10 to 20 times of shooting while changing in the range of 5 ms ~ 100 ms the exposure time. If refractory lining of a low temperature such as after spraying α is subject, for example, while the exposure time varied from 10 ms ~ 200 ms, it is preferably performed 15 to 30 times of photographing.
[0042]
　In the diagnosis support apparatus 10 according to the present embodiment, as shown in FIG. 4, six cameras 11 are fixed on a single table 13, and is movable table 13 by the table moving mechanism 15 . Therefore, it is possible to quickly shoot inner circumferential surface 104a of the dip tube 104 just after RH removal process by moving six cameras 11 simultaneously. Position the camera 11 is fixed on the table 13, when disposed in the photographing position to be described later, do not overlap with the inner peripheral surface 104a substantially equidistant and with the central axis of each of the two dip tubes 104 It is set to a position slightly spaced from the inner peripheral surface 104a.
[0043]
　Table moving mechanism 15, a photographing position shown in FIG. 5, to move the table 13 between a retracted position shown in FIG.
　The photographing position, is disposed at a position table 13 is directly below the RH degassing vessel 100, thereby, is arranged at a position the camera 11 do not overlap with the inner circumferential surface 104a of the dip tube 104 in a plan view.
　In the retracted position, the table 13 is located away from immediately below the RH degassing vessel 100, thereby, is arranged at a position the camera 11 do not overlap in the RH degassing vessel 100 in a plan view.
[0044]
　As shown in FIGS. 4 to 6, the table moving mechanism 15, support a post 15a extending in the vertical direction from the ground G, it extends horizontally from the posts 15a, a pivotally table 13 about the axis of the strut 15a It constituted by an arm 15b that.
　According to this configuration, only by turning the arm 15b, it is possible to easily move the table 13 between a photographing position and a retracted position. Accordingly, it suppressed the diagnosis time required, for example, within 3 minutes (possible within 70 seconds). For example, the imaging time by the camera 11 is approximately less than 10 seconds to 1 minute, moving time of the table 13 is 1 to 2 minutes. Here, the time required for diagnosis say, the moving time of the table 13 from the retracted position to the photographing position, photographing time by the camera 11, and refers to the total of the processing time of the image.
[0045]
　Hereinafter, an example of the timing for moving the table 13.
　During RH processing of the previous charge, table 13 is placed in the retracted position. After RH treatment, degassing vessel 100 is elevated RH, a ladle (not shown) is conveyed to the next step. Thereafter, the arm 15b is pivoted, the table 13 is moved to the photographing position. Then, in the photographing position, perform imaging by the camera 11.
[0046]
　When diagnosis is completed, the arm 15b is pivoted, the table 13 is moved to the retracted position. The repair by appropriate methods in a state where the table 13 is moved to the retracted position is performed as necessary, preparation of RH treatment of the trailing charge is initiated.
[0047]
　Thus, according to the diagnosis support apparatus 10 of the present embodiment can be diagnosed surface properties (presence or absence of cracks, the crack length) of refractory lining α of dip tube 104 to accurately. This makes it possible to appropriately perform the selection of the necessity determination, and method of repairing a repair. As a result, by a suitable method can be carried out repair of cracks, it is possible to increase the efficiency of RH degassing treatment.
[0048]
　Diagnosis support apparatus 10 according to this embodiment, and the melt dripping from the middle of the dip tube 104 which moves the table 13 strikes the camera 11, the melt rebounding collides with the table 13 during shooting to avoid colliding with the camera 11, the accommodating case 30 for accommodating the camera 11 may be fixed to the table 13. Hereinafter, based on FIG. 8 will be described in detail this configuration.
[0049]
　8, when the diagnosis support apparatus 10 comprises a housing case 30 is a schematic view when viewed structure around the camera 11 in the horizontal direction. As shown in FIG. 8, the accommodating case 30, top provided on the upper edge of the peripheral wall 30a so as to cover the peripheral wall 30a that is erected on the upper surface of the table 13 so as to surround the periphery of the camera 11, an upper camera 11 and a plate 30b.
[0050]
　Each camera 11 is accommodated individually in the housing case 30. Part of the top surface of each of the accommodating case 30 is a transparent heat-resistant glass 31, the camera 11 can photograph the inner circumferential surface 104a of the dip tube 104 through the heat resistant glass 31. Heat-resistant glass 31 may be provided on the entire upper surface of the housing case 30. May be applied a known as heat-resistant glass 31.
[0051]
　Even if the diagnosis support apparatus 10 comprises a housing case 30 and heat-resistant glass 31, the photographing position, is disposed at a position where the camera 11 do not overlap with the inner circumferential surface 104a of the dip tube 104 in a plan view. The heat-resistant glass 31, the inner melt dripping from the circumferential surface 104a may collide with the camera 11 is prevented, but impairs the transparency and the like of the heat-resistant glass 31 when the melt heat-resistant glass 31 collide, in some cases, heat-resistant glass 31 lead to damage to the camera 11 opens a hole in, and there is a possibility that appropriate imaging is inhibited.
[0052]
　Note that the one side of the housing case 30 has a door (not shown) is provided. In order to fine-tune the attitude of the camera 11 to open the door.
[0053]
　Camera 11 for taking the inner peripheral surface 104a in the photographing position through a transparent heat-resistant glass 31, it is desirable to prevent damage to the heat-resistant glass 31. Accordingly, as shown in FIG. 8, a lid 33 which can cover the heat-resistant glass 31 preferably has a cover opening and closing mechanism 35 for opening and closing the lid 33. Thus, it is possible to prevent the melt dripping from the dip tube 104 in the middle of moving the table 13 strikes the upper surface of the heat-resistant glass 31.
　The lid 33 is are preferably disposed so as to cover the entire surface of the heat-resistant glass 31, it may be installed so as to cover only the upper vicinity of the camera 11 of the housing case 30.
[0054]
　In the example shown in FIG. 8, the lid opening and closing mechanism 35 is constituted by a first protrusion 35a, the second protrusion 35b, an air cylinder 35c, and a hinge 35d.
　The first protrusion 35a is provided on the upper surface of the housing case 30 so as to protrude vertically upward.
　The second protrusion 35b is provided on the upper surface of the lid 33 so as to project vertically upward.
　The air cylinder 35c has one end pivotally connected to the distal end of the first projection 35a, the other end is pivotally connected to the distal end of the second protrusion 35b.
　The hinge 35d is in an intermediate position between the first protrusion 35a and the second protrusion 35b, connecting the upper surface of the edge portion and the housing case 30 of the lid 33 rotatably.
　According to this configuration, by the expansion and contraction of the air cylinder 35c, lid 33 is rotated about the hinge 35d, regions of heat-resistant glass 31 is opened and closed.
[0055]
　Cover opening and closing mechanism 35 opens the lid 33 when the table 13 is in the capturing position, it is preferable to control the opening and closing of the lid 33 so that the lid 33 is closed when the table 13 is moving. In this case, even if the melt from the inner circumferential surface 104a of the hot dip tube 104 during movement falling of the table 13, can be prevented that the melt strikes the heat-resistant glass 31.
[0056]
　Hereinafter, the diagnosis support apparatus 10 accommodating case 30, heat resistant glass 31, in a case with a lid 33 and a lid opening and closing mechanism 35, will be described an example of a timing for moving the table 13.
　During RH processing of the previous charge, table 13 is placed in the retracted position. In this case, it is preferable that the lid 33 on the heat-resistant glass 31 is closed. After RH treatment, degassing vessel 100 is elevated RH, a ladle (not shown) is conveyed to the next step. Thereafter, the arm 15b is pivoted, the table 13 is moved to the imaging position in a state where the lid 33 is closed. Then, in the photographing position, the air cylinder 35c is actuated, the lid 33 is opened, perform photographing by the camera 11.
[0057]
　When the diagnosis is completed, the air cylinder 35c is actuated, the lid 33 is closed. Then, the arm 15b is pivoted, the table 13 is moved to the retracted position in a state where the lid 33 is closed. The repair by appropriate methods in a state where the table 13 is moved to the retracted position is performed as necessary, preparation of RH treatment of the trailing charge is initiated.
[0058]
　The diagnosis support apparatus 10 preferably further comprises a gas supply mechanism for supplying gas to the housing case 30. In this case, by the supply of cold gas into the accommodating case 30, the pressure of the accommodating case 30 is increased than the accommodating case 30 external pressure (atmospheric pressure). Therefore, there is no possibility that the accommodating case 30 outside the dust from entering the housing case 30. As a result, it is possible to prevent the malfunction of the camera 11 due to dust. Further, by the supply of gas to the housing case 30, the housing case 30 in the gas flows. Therefore, the temperature of the accommodating case 30 is never abnormally increased. As a result, it is possible to prevent thermal damage to the camera 11.
[0059]
　As a typical example, the gas supplied to the accommodating case 30 is air. In this case, the gas supply mechanism, for example, pipes, including valves and compressors. Piping communicating the housing case 30 and the compressor. Valve to open and close the path of the pipe. The compressor produces compressed air. The gas is an inert gas (eg argon gas, nitrogen gas) may be used.
[0060]
　Diagnosis support apparatus 10 of the above preferably further comprises a thermometer for measuring the temperature of the housing case 30. In this case, the temperature inside the storage case 30 is monitored by a thermometer. For example, if the temperature of the accommodating case 30 exceeds a certain temperature alarm or emitted is, or is increased the amount of gas supplied from the gas supply mechanism. This can prevent thermal damage to the camera 11. The measurement points of the temperature is not particularly limited, for example, the wall temperature of the accommodating case 30 can be measured.
[0061]
(Second Embodiment)
　Hereinafter, a second exemplary degassing vessel diagnosis support method RH according to an embodiment of the present invention (hereinafter, simply referred to as "diagnosis support method") will be described.
　The diagnosis support method according to the present embodiment, in the flowchart shown in FIG. 9, the image taking step S1, to implement an image processing process S2 in order. These steps S1, S2 is performed during the period from the completion of the RH of the prior charge degassing, before the start of RH degassing treatment of the trailing charge.
[0062]
　First, in the image taking step S1, after the completion of RH degassing treatment, to shoot the inner circumferential surface 104a of the dip tube 104 by the camera 11 of the diagnosis support apparatus 10, for example according to the first embodiment.
　Specifically, with respect to dip tube 104 in a high temperature state immediately after the RH degassing treatment, with the camera 11 in a plan view is disposed outside the inner circumferential surface 104a of the dip tube 104, out of the dip tube 104 capturing an image viewed circumferential surface 104a from below, to obtain data.
[0063]
　Next, the image processing step S2, the image processing apparatus, the image processing of the data of the inner peripheral surface 104a of the dip tube 104 obtained by the photographing process S1 performs.
[0064]
　The diagnosis support method including such a series of steps S1, S2, it is possible to obtain an image of the inner circumferential surface 104a of the dip tube 104, the necessity of identifying and repairing the presence and length of the crack repair method it is possible to determine. Therefore, it is possible to avoid consuming repair time than necessary. Therefore, it is possible to perform the minimum repair required between the RH degassing treatment of RH of the prior charge degassing and the following charge, it is possible to increase the efficiency of RH degassing treatment.
[0065]
(Third Embodiment)
　Hereinafter, a third embodiment RH degassing vessel diagnostic method according to the embodiment of the present invention (hereinafter, simply referred to as "diagnostic method") will be described.
　The diagnostic method according to the present embodiment, in the flowchart shown in FIG. 9, the image taking step S1, the image processing step S2, a crack specification step S3, performed sequentially and repairing method determining step S4. These steps S1 ~ S4 is performed between after completing the RH of the prior charge degassing, before the start of RH degassing treatment of the trailing charge.
[0066]
　First, in the image taking step S1, after the completion of RH degassing treatment, to shoot the inner circumferential surface 104a of the dip tube 104 by the camera 11 of the diagnosis support apparatus 10, for example according to the first embodiment.
　Specifically, with respect to dip tube 104 in a high temperature state immediately after the RH degassing treatment, with the camera 11 in a plan view is disposed outside the inner circumferential surface 104a of the dip tube 104, out of the dip tube 104 capturing an image viewed circumferential surface 104a from below, to obtain data.
[0067]
　Next, the image processing step S2, the image processing apparatus, the image processing of the data of the inner peripheral surface 104a of the dip tube 104 obtained by the photographing step S1 performed.
　Then, the crack identifying step S3, based on the image processing data to identify the presence or absence of cracks generated in the inner circumferential surface 104a of the dip tube 104. At this time, also identifies the length of the crack. This identification may be performed, for example, automatically using image processing apparatus 17 of the diagnosis support apparatus 10 described above.
[0068]
　Then, the repairing method determining step S4, in response to the presence or absence of cracks and length, to determine the necessity and repairing method of repairing.
　For example, if you identify that there is a crack, it determines that the length of the crack conduct spray repair is equal to or less than a predetermined threshold, carrying out the press-repair if a predetermined threshold greater.
[0069]
　As already described with reference to the graph shown in FIG. 3, the present inventors have found that the pre-spraying repair if the crack length of 20mm or less, development of a crack can be favorably suppressed by spraying repair, spray repairing previous If the crack length is more than 20mm, even if the spray repair was discovered that you can not suppress the development of cracks. The length of the threshold crack before spraying repair the crack propagation can be suitably suppressed by spraying repair, the dimensions of the vacuum degassing vessel and the dip tube, and varies depending on the material and size of the refractory. In the vacuum degassing vessel used to create Figure 3, the crack length threshold before spray repair was 20 mm.
　Accordingly, the repairing method determining step S4, it is preferable to set the predetermined threshold value in terms of creating the graph as shown in Figure 3 for each individual vacuum degassing vessel. Specifically, as shown in FIG. 3, obtained by experiments or simulation of the relationship between the case carrying out the spray repair as "crack length before the repair" and "crack growth rate", "crack growth rate" is rapidly it may be set to "crack length before the repair" as a threshold value when increasing the. For example, the predetermined threshold may be a value between 10 mm ~ 30 mm, or a value between 15 mm ~ 25 mm.
　Incidentally, if identified that cracks do not in crack specifying step S3, or small if only are identified crack length (for example 5mm or less), RH of the trailing charged without repairing degassing process may be started.
[0070]
　The diagnostic method comprising such a series of steps S1 ~ S4, since the necessity and repairing method of repairing on the basis of the presence or absence and the length of the crack is determined, is possible to avoid consuming repair time than necessary it can. Therefore, it is possible to perform the minimum repair required between the RH degassing treatment of RH of the prior charge degassing and the following charge, it is possible to increase the efficiency of RH degassing treatment.
[0071]
(Fourth Embodiment)
　In a fourth embodiment RH degassing vessel repair method according to the embodiment of the present invention, based on the repair method determined in repairing method determining step S4 in above the inner circumferential surface 104a (refractory lining of the dip tube 104 to repair the α).
　In this case, not only the refractory lining α of the inner peripheral surface 104a of the dip tube 104, it is preferable to also repair simultaneously α refractory lining of the lower tank 103.
　In one RH degasser, time required from capturing process S1 described above to repairing method determining step S4, 1 minute to 3 minutes, the time required for spraying repair, 5 minutes to 10 minutes. In continuous operation process, since the time between RH degassing treatment of RH of the prior charge degassing and the following charge is 15 minutes to 25 minutes, to set the time for preheating the RH degassing tank after spraying repair possible it is.
[0072]
　Has been described above with reference to certain preferred embodiments of the present invention, the present invention is not limited to the above embodiments, without departing from the scope of the present invention, various modifications are possible.
　In the embodiment described above, although with a degassing vessel 100 RH having a dip tube 104 two as the vacuum degassing vessel, be used DH degassing vessel which have a dip tube 104 only one as the vacuum degassing vessel good.
　In the embodiment described above, although with a table 13 for fixing the camera 11, without using the table 13 may be a camera 11 as a configuration for directly fixed to the distal end of the arm 15b.
　In the above embodiment, the camera 11 is directly photographed image viewed inner circumferential surface 104a of the dip tube 104 obliquely from below, by using a heat mirror or the like, the inner peripheral surface 104a of the dip tube 104 may be indirectly captured image viewed obliquely from below.
[0073]
　In the above-described embodiment, the table moving mechanism 15 is moved by rotating the table 13 by a post 15a and an arm 15b, the table moving mechanism 15 may be configured to linearly move the table 13.
　In the embodiment described above, each camera 11 is accommodated individually in the accommodating case 30, the plan view shape of the housing case 30 to change in accordance with the arrangement of the camera may accommodate a plurality of cameras 11 .
　In the embodiment described above, although using the air cylinder 35c as a lid opening and closing mechanism 35 may be used a fluid pressure cylinder such as a hydraulic cylinder. Also, using an electric motor or the like, it may be configured to slide along the upper surface of the accommodating case 30 without rotating the lid 33.
Industrial Applicability
[0074]
　Diagnosis support device of the present invention can be effectively used for vacuum degassing due RH method or DH method.
DESCRIPTION OF SYMBOLS
[0075]
　10 diagnosis support apparatus
　11 the camera
　13 Table
　15 table moving mechanism
　15a struts
　15b arm
　17 image processor
　19 monitor
　30 housing case
　30a surrounding wall
　30b top plate
　31 of heat-resistant glass
　33 lid
　35 lid opening and closing mechanism
　35a first protrusion
　35b second protrusion
　35c air cylinder
　35d hinge
　100 RH degassing vessel
　101 upper tank
　102 intermediate tank
　103 lower tank
　104 dip tube
　within 104a circumferential surface
　104b outer peripheral surface
　104c bottom
　α refractory lining
　G ground

WE CLAIM

A diagnostic support apparatus of the vacuum degassing vessel having a dip tube extending downwardly,
　while being disposed outside the inner peripheral surface of the dip tube in a plan view, obliquely the inside peripheral surface of said dip tube capturing an image viewed from below, and a camera for acquiring the image as data,
　is connected to the camera, an image processing apparatus that performs image processing of the data
diagnosis support apparatus, characterized in that it comprises a.
[Requested item 2]
　A table for fixing the camera,
　a photographing position of said camera in a plan view is disposed in a position that does not overlap with the inner peripheral surface of the dip tube, the position where the camera in plan view does not overlap with the vacuum degassing vessel , a table moving mechanism for moving the table between a deployed are retracted position
diagnostic support apparatus according to claim 1, characterized in that it comprises further.
[Requested item 3]
　Said table moving mechanism includes
　a post extending in the vertical direction,
　extends horizontally from the pillar, an arm which supports a pivotally said table about an axis of the strut
according to claim 2, characterized in that it comprises a diagnostic support device described in.
[Requested item 4]
　It is fixed to the table, further comprising a housing case for housing the camera,
　at least a portion of the upper surface of the housing case is a heat-resistant glass
diagnostic support apparatus according to claim 2 or 3, characterized in that.
[Requested item 5]
　The housing case,
　　the the lid covering at least a portion of the heat-resistant glass,
　　the lid is opened when the table is in the photographing position, so that a state where the lid is closed when the table is moving a cover opening and closing mechanism, for opening and closing the lid to the
diagnosis support device according to claim 4, characterized in that it comprises a.
[Requested item 6]
　Gas supply mechanism for supplying a gas into the housing case
diagnostic support apparatus according to claim 4 or 5, further comprising a.
[Requested item 7]
　Thermometer for measuring the temperature inside the housing case
diagnosis support device according to any one of claims 4-6, characterized by further comprising a.
[Requested item 8]
　The camera control unit for capturing a plurality of images while varying the exposure time of the camera within a range of 5 ms ~ 300 ms
diagnosis support according to any one of claims 1 to 7, further comprising a apparatus.
[Requested item 9]
　The camera, which photographs the inside peripheral surface of the dip tube while also disposed outside the outer peripheral surface of the dip tube in a plan view
according to one of claims 1 to 8, characterized in that diagnostic support device.
[Requested item 10]
　The camera is more disposed about the central axis of the dip tube in a plan view
diagnosis support apparatus according to any one of claims 1 to 9, characterized in that.
[Requested item 11]
　The camera shoots over the inner peripheral surface of the dip tube all around
diagnostic support apparatus according to claim 10, characterized in that.
[Requested item 12]
　The camera is, of the inner peripheral surface of the dip tube, to shoot the area closest to the center axis of the vacuum degassing vessel in a plan view
according to one of claims 1 to 9, characterized in that diagnostic support device.
[Requested item 13]
　The vacuum degassing vessel, wherein a degassing tank RH having a dip tube two
diagnostic support apparatus according to any one of claims 1 to 12, characterized in that.
[Requested item 14]
　A diagnosis support method of the vacuum degassing vessel with diagnosis support apparatus according to any one of claims 1 to 13,
　an image viewed the inner peripheral surface of the dip tube obliquely from below by the camera photographed, and photographing step of acquiring data,
　said by the image processing apparatus, an image processing step of performing image processing of the data acquired by the photographing step
diagnosis support method, characterized in that it comprises a.
[Requested item 15]
　A claim 1-13 or diagnostic methods of the vacuum degassing vessel with diagnosis support device according to one of,
　an image viewed the inner peripheral surface of the dip tube obliquely from below by the camera photographed, and photographing step of acquiring data,
　by the image processing apparatus, the image processing step of performing image processing of the data obtained by the photographing step,
　based on the data subjected to image processing, the inside of the dip tube a crack specifying step of specifying the presence and length of the crack of the peripheral surface,
　depending on whether the length of the crack was identified by the cracking specifying step, a repairing method determination step of determining necessity and repairing method of repairing ,
diagnostic methods and having a.
[Requested item 16]
　In repairing method determined by the repairing method determining step of claim 15 for repairing the inner peripheral surface of the dip tube
repairing method, characterized in that.