Art
[1]
The present invention relates to end the operation processing unit and ends the operation method of the continuous casting machine.
BACKGROUND
[2]
As a way to end the general continuous casting and the molten steel of the tundish used for closing the stopper (stopper) or the slide gate (slide gate) in order to prevent the molten steel supplied to the mold from the tundish is reached constant weight.
[3]
Here, at the end of continuous casting, it is important to minimize the residual molten steel in the tundish, it is an object to minimize the residual molten steel in the tundish is in increasing the casting efficiency by increasing the casting of molten steel silsuyul.
[4]
In the process of supplying a tundish molten steel in the mold as much as possible, there arises a case tundish flux is introduced into the mold.
[5]
In this case, because the presence to a tundish flux in the bath surface above an excess delay the solidification of the bath surface when out of bath surface is out of the mold lower portion after cut off the supply of the tundish molten steel, the water sprayed on the strand is introduced to the bath surface, When reacting with unsolidified molten steel, a problem arises that the molten steel is scattered. Then, when the molten steel scattering, and thereby damaging the equipment while now attached to the strand guiding roller, and should replace the damaged segment is able to start casting again.
Detailed Description of the Invention
SUMMARY
[6]
Providing a termination operation of the turn-dish continuous casting machine to maximize casting silsuyul of molten steel object of the conceived invention while minimizing the inflow mold of tundish flux in order to solve the conventional problems processing device and shutdown operating method there used.
Problem solving means
[7]
Weight detection unit for operation end processing apparatus of the continuous casting machine according to one embodiment of the invention detects the weight of the molten steel in the tundish; A mold for receiving the molten steel discharged from the tundish; Bath surface detector for detecting the position of the molten steel bath surface in the mold; Caused by influx of tundish flux into said mold thermocouple to measure the temperature of copper plate in the mold; And processing the signal to terminate the molten steel by weight and operation of then, based on the copper temperature, detecting the time of the slag in the mold which carry-over (carry-over), the continuous casting machine to the point at which the carry-over in the turn-dish and a processing end signal to provide a.
[8]
[9]
End operation processing method of the continuous casting machine according to one embodiment of the present invention includes the steps of detecting the weight of the molten steel in the tundish; Measuring the temperature of copper plate of the mold; Detecting slag carryover (carry-over) point of the mold according to the turn-dish flux flowing into the mold on the basis of the weight of the molten steel, the copper plate temperature and the bath surface height changes; And providing the processed signal to terminate the operation of the continuous casting machine at the time the slag carry-over (carry-over).
Effects of the Invention
[10]
The invention tundish flux it is possible to rapidly detect the situations that flows into the mold, by terminating the point of ending the continuous casting to the moment the slag carry-over (carry-over), which ends at a certain tundish molten steel amount There can be no casting tundish molten steel than that, because this provides the advantage of increasing the casting silsuyul.
Brief Description of the Drawings
[11]
1 is a system diagram showing a termination operation processing apparatus of the continuous casting machine according to one embodiment of the present invention.
[12]
Figure 2 is an illustration showing a state in the mold when the cast molten steel and the drawing speed of the feed rate of the balance Fig.
[13]
3 is a diagram showing the appearance tundish flux is introduced into the mold.
[14]
Figure 4 is a flow chart showing the operation end processing method of the continuous casting machine according to one embodiment of the present invention.
[15]
5 is an example graph of the tundish weight, mold level, the mold temperature, by taking into account the correlation between the stopper stroke detecting a time when the carriage bore of tundish flux (carry over) end the casting operation.
Best Mode for Carrying Out the Invention
[16]
With reference to the accompanying drawings, in self having ordinary skill in the art will be described in detail a preferred embodiment to easily carry out the present invention. However, in describing in detail the preferred embodiment of the present invention, a detailed description of known functions and configurations that are determined to unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, the same reference numerals throughout the drawings for parts that a similar function and operation.
[17]
In addition, throughout the specification, to that which is part of the "connected" with another part, which even if it is the case that is "directly connected to", as well as, interposed between the other element or intervening "indirectly connected to" It includes. In addition, it should "include" any component, it means that not to exclude other components not specifically described that are opposite may further contain other components.
[18]
[19]
Hereinafter will be described the operation end processing apparatus and method of continuous casting machine according to an embodiment of the present invention with reference to the drawings in more detail for example.
[20]
1 is a system diagram showing a termination operation processing apparatus and a continuous casting machine for continuous casting machine according to one embodiment of the present invention.
[21]
Continuous casting (Continuous Casting) is a casting, drawing the slab or ingot (Steel Ingot) continuously while the solidification in the mold (Mold) a bottomless molten metal. Continuous casting is used to manufacture long products and materials in bloom slabs, billets and rolled mainly for simple cross-shaped, such as square, rectangular, circular.
[22]
1, the continuous casting machine 100 may include a ladle 10 and the tundish 20, a mold 30, a secondary cooling zone (60 and 65), the pinch rolls 70, and the controller .
[23]
Tundish (Tundish, 20) is a container for supplying a molten metal receiving molten metal from the ladle (Ladle, 10) in the mold (Mold, 30). A tundish (20) performs the control the feed rate of the molten metal flowing into the mold (30), with each mold 30, the molten metal distribution, storage, slag and separation of the non-metallic inclusions in the molten metal, or the like.
[24]
Mold 30 is provided with a water-cooled copper plate, thereby cooling the primary grade steel. Mold 30 has a pair of surfaces facing in to viewing structural form openings to form a hollow portion which is received molten steel. In the case of preparing a cast, the mold 30 includes a pair of end wall connecting the pair of wall and the barrier. Here, the end wall is to have a smaller width than the barriers.
[25]
Walls, primarily the end wall of the mold 30 may have a tapered (Taper) of a certain level are rotated to approach or move away relative to each other. This taper is set to compensate for the shrinkage due to solidification of the molten steel (M) in the mold (30). Solidification degree of the molten steel (M) will vary by the carbon content of the steel type, the type of the powder (steel naenghyeong Vs complete naenghyeong), the casting speed.
[26]
Mold (30) serves to ensure that maintaining the play state shifts shape extracted from the mold 30, yet prevent coagulation is the less molten metal being solidified to form a leak resistant or each solidified shell. Mold 30 is illustration (oscillation, reciprocation) coming by the oscillator so as to prevent the molten steel from sticking to the wall surface of the mold. The lubricant is used to prevent the coming of reducing the friction with the illustration when the mold 30 and the solidified shell 81 ride. Lubricant to have a powder (Powder) is added to the molten metal surface in the rape oil, which fills the mold and pumping (30).
[27]
The powder in the lubricant, as well as the surface of the mold 30 within the oxide / nitride prevents the molten metal and heating, the molten metal of the melt and the addition of the slag to the metal mold 30 and the solidified shell 81 in the mold 30 it also functions as an absorption surfaced non-metallic inclusions.
[28]
The second cooling zone (60 and 65) is further cooled by the first drive cooling the molten steel in the mold (30). The primary cooling molten steel while being held so that each of the coagulation is not deformed by the support roll 60, is directly cooled by the spraying means 65 for spraying water. Solidification play state is achieved by most secondary cooling.
[29]
Note conveniently drawing device has naedorok pulled no-slip playing state shift employing such a multi-drive method using the pinch rolls (70). The pinch roll 70 allows the molten steel that has passed through the mold (30) by pulling the leading end of the solidified molten steel in the casting direction can be moved continuously in the casting direction.
[30]
Molten steel (M) in the tundish 20 is caused to flow into the mold 30 by the immersion nozzle (25) extending into the mold 30. An immersion nozzle 25 is disposed at the center of the mold 30, so that the flow of molten steel (M) to be discharged from both the discharge port of the immersion nozzle 25 can achieve symmetry.
[31]
The start of the discharge, the discharge speed, and stop of the immersion liquid steel (M) through the nozzle (25) is determined by a stopper (Stopper, 21) provided in the tundish 20 in response to the immersion nozzle (25). More specifically, the stopper 21 can be vertically moved along the same line and the submerged nozzle (25) to open and close the inlet of the submerged nozzle (25). Control of the flow of the molten steel (M) through the immersion nozzle 25, it is also possible to use a stopper different manner as the slide gate (Slide gate) method. Slide gates are control of the discharge flow rate of the molten steel (M) through the immersion nozzle (25) while sliding in a horizontal direction within the sheet material tundish 20.
[32]
Molten steel (M) in the mold (30) begins to solidify from the part in contact with the wall surface forming the mold (30). It is easy to lose heat by the mold 30, which is a peripheral portion than the center of the molten steel (M) water cooling. By the manner in which the peripheral portion is solidified first, back along the casting direction of the cast steel play 80 is led to the form of unsolidified molten steel 82 is wrapped around the excitation solidified shell 81.
[33]
Pinch rolls (70) according to pulling the leading end 83 of the playing slab (80) is completely solidified, unsolidified molten steel 82 is moved in the casting direction together with the solidified shell 81. Unsolidified molten steel 82 is cooled by the spraying means 65 for spraying cooling water from the above transfer process. This causes the unsolidified molten steel 82 in the thickness occupied by playing slab 80 becomes smaller gradually. Playing slab 80 reaches the work point (85), playing the cast steel 80 is filled with a solidified shell becomes, the entire thickness (81). Playing slab 80 coagulation is completed is cut into a predetermined size at the cutting point (91) is divided into slabs (P) such as a slab.
[34]
[35]
1, the end operation processing unit 200 of the continuous casting machine according to one embodiment of the present invention includes a weight detection unit 210, the thermocouple 220 and the end signal processor 240.
[36]
The weight detecting unit 210 performs a function of detecting the weight of the molten steel in the tundish.
[37]
The thermocouple 220 serves to measure the copper plate temperature in the inlet due to the turn-dish flux into the mold for receiving the molten steel discharged from the tundish above the mold (30). The thermocouple 220 may be provided with at least one or more along the casting direction at the same width position of the mold is provided with at least one in the circumferential direction at the same height position (30), said mold (30).
[38]
Turn back the molten steel is almost the ground state in the dish, and then flows into a mold through a tundish flux immersion nozzle covering the tundish molten steel. Tundish flux is hovering over the molten steel bath surface due to the lower specific gravity than the molten steel, wherein, to become in short supply of molten steel, the molten steel bath surface level in the mold is gradually decreased.
[39]
Accordingly, the thermocouple 220 performs the function of measuring the temperature change of the mold due to the molten steel bath surface of the water level becomes lower (that is, the molten steel in the mold Less capacity).
[40]
And then to the end signal processor 240 based on the molten steel by weight, temperature of the mold in the tundish, to detect the time of the slag in the mold which carry-over (carry-over), at the time the slag is over Cary It serves to provide a termination signal for terminating operation of the continuous casting machine to the controller.
[41]
On the other hand, an end operation processing unit 200 of the continuous casting machine according to one embodiment of the present invention may include a first detector 230 and second detector 231 for detecting the height change of the molten steel bath surface. The first detector 230 may be a ECLM (Eddy Current Level Meter), the second detector 231 may be a radiation detector.
[42]
The second detector 231 detects the radiation dose emitted from the slag in the mold to detect the change in height of the molten steel bath surface. In general, due to the molten steel assumed a volume of the slag, the slag is introduced into the mold when the absolute position of the molten steel bath surface is lower than the actual set position.
[43]
[44]
Figure 2 is when the cast drawing rate and by way of illustration showing a state of the mold even when the feed rate of the molten steel balance, to Figure 2, the condition is kept molten steel bath surface is constant is attached to the copper plate to the top of the molten steel and the slag bear (B) that is present, the molten steel (M) top to the the melter floor (16), the sintered layer (C) and the mold powder layer (a) is formed and, normally in the operating situation bath surface is about ± 3mm range initial solidification layer and the slag bear (B) because the control is to maintain a stable form.
[45]
[46]
Figure 3 is a tundish flux when standing road showing a state that flows into the mold, see Figure 3, turn back the molten steel is almost the ground state in the dish, a tundish flux (D) the immersion nozzle covering the molten steel in the tundish Once introduced into a mold, tundish flux (D) through is hovering over the molten steel bath surface due to the lower specific gravity than molten steel (M), wherein, to become in short supply of molten steel (M), the molten steel bath surface level in the mold is gradually decreased It becomes.
[47]
[48]
Figure 4 is a flow chart showing the operation end processing method of the continuous casting machine according to one embodiment of the present invention.
[49]
4, the inside end operation processing method (S700) of a continuous casting machine in accordance with one embodiment of the present invention comprises a step (S710) for detecting a molten steel weight in the tundish from the weight detecting section 210, a mold a step (S720) of measuring the temperature, and may be more specific, measuring from the thermocouple the copper plate temperature in the due to the inflow of tundish flux into the mold for receiving the molten steel discharged from the tundish above the mold (30).
[50]
Turn back the molten steel is almost the ground state in the dish, and then flows into a mold through a tundish flux immersion nozzle covering the tundish molten steel. Tundish flux is hovering over the molten steel bath surface due to the lower specific gravity than the molten steel, wherein, to become in short supply of molten steel, the molten steel bath surface level in the mold is gradually decreased.
[51]
Accordingly, the thermocouple 220 measures the temperature of the molten steel bath surface due to the water level becomes lower (that is, the molten steel in the mold capacity Less) mold.
[52]
Next, the step of detecting in the molten steel by weight, and the copper plate temperature and the bath-surface slag carryover (carry-over) at the end of the call processing unit 240 the time of the mold according to the turn-dish flux flowing therein in the mold based on the height variation ( S730) and a slag may comprise a carry-over (steps (S740) to provide a termination signal for terminating operation of the continuous casting machine at the time the carry-over).
[53]
End operation processing method of the continuous casting machine according to one embodiment of the present invention (S700) is further for detecting a molten steel bath surface height variation of the mold by using the first detector 230 and second detector 231 It can be included.
[54]
The first detector 230 may be a ECLM (Eddy Current Level Meter), the second detector 231 by a radiation detector, detecting the radiation dose emitted from the slag in the mold detects the height change of the molten steel bath surface do. In general, due to the molten steel assumed a volume of the slag, the slag is introduced into the mold when the absolute position of the molten steel bath surface is lower than the actual set position.
[55]
[56]
5 is a tundish weight (molten steel weight in the example, turn-dish), mold level, the mold temperature, the carry-over of tundish flux, taking into account the correlation between the stopper stroke (carry over) the end of the casting operation to detect the point at which one embodiment is the graph.
[57]
5, the end of casting, the tundish weight is started to detect the time of carry-over (carry over) of tundish flux from 15 ton point. At this time, copper was the temperature of the molten steel bath surface near a small decline from the 26,030 seconds, while falling about 30mm of bath surface immediately prior to 26,050 seconds soon had a falling temperature of the copper plate.
[58]
This can be determined that the slag carry-over to about 26,055 seconds. Therefore, slag carry-turn than by sending a termination signal to the controller of the continuous casting machine to the over-time stop the molten steel supplied was due by end the playing operation, a conventional (e.g., quit the playing operation based on the tundish molten steel amount), DC It derived the experimental result that it can more casting 2-5 tons of the molten steel.
[59]
[60]
Although embodiments as described in more detail the present invention above, the present invention is not necessarily limited to such an example, it may be performed variously modified without departing from the spirit of the invention.
[61]
Thus it disclosed herein are for describing an embodiment, not intended to limit the scope of the present invention, but the scope of the technical concept of the present invention, by such an embodiment is not limited. The scope of protection of the invention is to be interpreted by the appended claims, all technical idea in a range equivalent will be construed as included in the scope of the present invention.

Claims
[Claim 1]
Weight detection section for detecting the weight of the molten steel in the tundish; A mold for receiving the molten steel discharged from the tundish; Caused by influx of tundish flux into said mold thermocouple to measure the temperature of copper plate in the mold; And on the basis of molten steel by weight, and the copper plate temperature in the tundish, after detecting the time of the slag in the mold which carry-over (carry-over), end to end the operation of the carry-over continuous casting machine at the time the signal end operation processing apparatus of the continuous casting machine comprising a processing end signal to provide a.
[Claim 2]
The method of claim 1, wherein the end of the operation processing apparatus further comprises a first detector for detecting the bath surface height variations of the molten steel in the mold, and a continuous first detectors (Eddy Current Level Meter) ECLM sensors casting machine.
[Claim 3]
According to claim 1, using a radiation source of claim terminate operation of the continuous casting machine processing apparatus further comprising: a second detection sensor for detecting the bath surface height variation of molten steel in the mold.
[Claim 4]
The method of claim 1 wherein the thermocouple, is provided at least one on the same height positions in the mold in the circumferential direction, an end operation and processing of the continuous casting machine is provided with at least one along the casting direction at the same width position of the mold Device.
[Claim 5]
Detecting the weight of the molten steel in the tundish; Measuring the temperature of copper plate of the mold; Detecting slag carryover (carry-over) point of the mold according to the turn-dish flux flowing into the mold on the basis of the weight of the molten steel, the copper plate temperature and the bath surface height changes; And end operation processing method of the continuous casting machine comprising the steps of providing a processed signal for terminating the operation of the slag carry-over (carry-over) the continuous casting machine at the time.
[Claim 6]
6. The method of claim 5, ECLM (Eddy Current Level Meter) end operation processing method of the continuous casting machine, comprising the step of detecting the bath surface height using the sensor further.
[Claim 7]
6. The method of claim 5, using a radiation source shutdown operating method of the continuous casting machine further comprises the step of detecting the change in height bath surface of the molten steel in the mold.