JP2019181511A - Determination system, determination device, control method and program - Google Patents

Abstract

To accurately detect rupture of a steel plate.SOLUTION: A determination system 1 according to the invention comprises: a looper 400 comprising a lifting roll 401 that is arranged on a carrying passage of a steel plate 10 and presses the steel plate 10 from above to generate tension and a counter balance weight 402 that adjusts force by which the lifting roll 401 presses the steel plate 10; a discharging device that is arranged on the carrying passage of the steel plate 10 to discharge the steel plate 10 to the looper 400; a drawing device that draws-in the steel plate 10 discharged from the looper 400; and rupture determining means that determines that there is a ruptured part being a ruptured end part of the steel plate 10 in a determination region 604 being a region between the discharging device and the drawing device, when a position in a vertical direction of the lifting roll 401 is equal to or lower than a roll reference height.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a determination system, a determination apparatus, a control method, and a program.

As a technique related to the breakage of a steel sheet when processing the steel sheet, Patent Document 1 discloses an operation stop method for feeding the rolled sheet and stopping the rolling mill simultaneously with the detection of the break.
Further, in Patent Document 2, when a condition such as the degree of change in armature current of the drive motor of either the payoff reel or the tension reel exceeds the allowable maximum current change value, the metal strip breaks. A plate breakage detection method is identified.

JP-A-3-248706 JP-A-4-29052

  However, when the steel plate is hot, the temperature of the steel plate affects the tension detector, and the breakage of the steel plate may not be detected accurately. In addition, when a break of a steel sheet is detected by a change in armature current, a false detection may occur.

  An object of this invention is to detect the fracture | rupture of a steel plate correctly.

  The determination system of the present invention is a looper that is disposed in a conveyance path of a steel plate, and includes a lifting roll that presses the steel plate from above to generate tension, and a counter balance weight that adjusts a force with which the lifting roll presses the steel plate. And a discharging device that is disposed in the conveying path of the steel plate and discharges the steel plate to the looper, a retracting device that draws the steel plate discharged from the looper, and a vertical position of the lifting roll is a roll reference height In the following, it is provided with the fracture | rupture determination means which determines with the fracture | rupture part which is the edge part of the said steel plate fractured | ruptured in the determination area | region which is an area | region between the said discharging apparatus and the said drawing-in apparatus.

  According to the present invention, it is possible to accurately detect a fracture of a steel plate.

It is a block diagram of a control system. It is a side view of a rolling mill. It is a hardware block diagram of a control apparatus. It is a functional block diagram of a control apparatus. It is a figure of the front field of casting rolling equipment. It is a figure which shows the example of a steel plate height graph. It is a figure of the 2nd middle field of casting rolling equipment, and a back field. It is a side view of a looper. It is a figure which shows the example of a looper height graph. It is a figure which shows the example of a looper height and speed graph. It is a figure which shows the example of a current differential value graph and a pinch roll speed graph. It is a conceptual diagram explaining a hot band. It is a figure which shows the example of a current differential value graph. It is a flowchart of a casting rolling control process. It is a flowchart of a casting machine stop control process. It is a figure showing a mode when a casting machine stops. It is a flowchart of a 1st fracture | rupture control process. It is a flowchart of a 2nd fracture | rupture control process. It is a flowchart of a fracture estimation time control process. It is a figure which shows the state change of the casting machine in a 1st operation example. It is a figure which shows the state change of the 1st pinch roll in a 1st operation example. It is a figure which shows the state change of the 2nd pinch roll in a 1st operation example. It is a figure which shows the state change of the rolling mill in the 1st operation example. It is a figure which shows the state change of the coiler in a 1st operation example. It is a figure which shows the state change of the 1st pinch roll in a 2nd operation example. It is a figure which shows the state change of the 2nd pinch roll in a 2nd operation example. It is a figure which shows the state change of the rolling mill in the 2nd operation example. It is a figure which shows the state change of the coiler in a 2nd operation example. It is a figure which shows the state change of the rolling mill in the 3rd operation example. It is a figure which shows the state change of the rolling mill in the 4th operation example.

[Control system configuration]
First, the configuration of the control system 1 will be described with reference to FIG. The control system 1 includes a casting and rolling facility 100, a control device 500, and a network 700 that connects the casting and rolling facility 100 and the control device 500, and performs casting and rolling of the steel plate 10. In the present embodiment, “down” is the direction of gravity, and “up” is the opposite direction of gravity. The control system 1 is an example of a determination system.
The casting and rolling equipment 100 includes a twin-roll continuous casting machine 150, a processing chamber 250, a cooling equipment 252, a camera 251, a transporter 300, a rolling mill 350, a looper 400, and a coiler 450.

The twin roll type continuous casting machine 150 is a casting machine that manufactures the steel plate 10 from molten steel, and includes an injection part 160 and a casting part 200.
The injection unit 160 is a device that injects 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 molten steel poured from the ladle. The molten steel injected into the tundish 161 passes through a spout which is a through hole provided in the lower part of the tundish 161 and is injected into the hot water pool 210 of the casting part 200.
The stopper 162 is a bar-like 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. As the stopper 162 moves in the vertical direction, the amount of molten steel injected from the tundish 161 into the cast part 200 changes. Further, when the stopper 162 moves to the lowest position and the spout of the tundish 161 is closed, the molten steel is not injected from the tundish 161 into the casting part 200.

  The casting part 200 manufactures the steel plate 10 from the molten steel injected from the injection part 160. The casting unit 200 includes a pair of casting rolls 201, a weir 202, a casting machine load cell 203, a casting machine power cylinder 204, a casting motor 205, and a casting machine speedometer 206.

Each of the pair of casting rolls 201 is a cylindrical roll, and is rotatable about the central axis as a rotation axis. The pair of casting rolls 201 have the same shape, and the 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 end on the casting roll gap side proceeds downward. A region surrounded by the upper side of the casting roll gap and the weir 202 is a hot water pool 210 in which molten steel injected from the injection portion 160 is accumulated.
When the pair of casting rolls 201 rotates while molten steel is poured into the hot water pool 210, the casting roll 201 cools and solidifies the molten steel on the surface of the casting roll 201. And a pair of casting roll 201 press-contacts the solidification shell which is the solidified molten steel, and discharges the steel plate 10 below from a casting roll gap.

The weirs 202 are provided at both ends of the pair of casting rolls 201 in the rotation axis direction and at least above the casting roll gap, and prevent molten steel from spilling from the hot water pool 210 in the rotation axis direction of the casting roll 201.
The casting machine load cell 203 is a load cell that is attached to one casting roll 201 and measures the casting roll pressing force. The casting roll pressing force is a force by which the casting roll 201 presses the molten steel or the steel plate 10 in the casting roll gap.
The casting machine power cylinder 204 is, for example, a hydraulic servo cylinder, and applies force to the casting roll 201 to which the casting machine load cell 203 is not attached to change the casting roll pressing force or change the casting roll gap. To do.
The casting motor 205 rotates the pair of casting rolls 201.
The casting machine speed meter 206 measures the rotational speed of the casting motor 205. A measurement value acquisition unit 559 of the control device 500 described later determines the casting machine speed based on the measurement result of the casting machine speedometer 206. The casting roll speed is the speed of the surface of the casting roll 201 and is the speed of the steel sheet 10 discharged from the twin-roll continuous casting machine 150.

The processing chamber 250 is filled with, for example, argon gas, and prevents oxidation of the steel sheet 10 discharged from the twin-roll continuous casting machine 150.
The camera 251 images the steel plate 10 in the processing chamber 250. The control device 500 determines a later-described steel plate height based on the captured image of the camera 251.
The cooling facility 252 is disposed between a first transporter 300A and a second transporter 300B, which will be described later, and cools the steel plate 10 by spraying cooling water on the transported steel plate 10 or the like.

The conveyance machine 300 conveys the steel plate 10 by drawing in the steel plate 10 and discharging it in the conveyance direction. The transporter 300 includes a pair of pinch rolls 301, a transporter load cell 305, a transport motor 303, a transporter speed meter 304, a transporter load cell 305, and an ammeter 306.
Each of the pair of pinch rolls 301 is a cylindrical roll, is rotatable about the central axis as a rotation axis, and is arranged so as to be lined up and down. 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 rotating the plates 10 in opposite directions while sandwiching the steel plate 10 through the steel plate 10 in the pinch roll gap and pressing the surface of the steel plate 10.
The transporter power cylinder 302 is a hydraulic servo cylinder, for example, and applies a force to the upper pinch roll 301 to change the pinch roll pressing force or change the pinch roll gap. The pinch roll pressing force is a force by which the pinch roll 301 presses the steel plate 10.
The transport motor 303 rotates the pair of pinch rolls 301. The torque of the transport motor 303 is proportional to the current flowing through the transport motor 303.
The transport machine speed meter 304 measures the rotational speed of the transport motor 303. A measurement value acquisition unit 559 of the control device 500 described later determines the pinch roll speed based on the measurement result of the transport machine speedometer 304. The pinch roll speed is the speed of the surface of the pinch roll 301, and is the speed of the steel plate 10 that the transport device 300 transports.
The carrier load cell 305 is a load cell that is attached to the lower pinch roll 301 and measures the pinch roll pressing force.
The ammeter 306 measures the current flowing through the transport motor 303.

The casting and rolling equipment 100 includes a first conveyor 300A and a second conveyor 300B as the conveyor 300.
300 A of 1st conveying machines are arrange | positioned in the position shifted | deviated from the casting roll gap of the twin roll type continuous casting machine 150 when it sees from the top. 300 A of 1st conveying machines draw in the steel plate 10 discharged | emitted from the twin roll type continuous casting machine 150, and convey the steel plate 10 by discharging | emitting in the direction of the 2nd conveying machine 300B. The second transporter 300B pulls the steel plate 10 transported from the first transporter 300A and discharges it in the direction of the rolling mill 350, thereby transporting the steel plate 10 to the rolling mill 350.

The pinch roll 301, the transport machine power cylinder 302, the transport motor 303, the transport machine speed meter 304, the transport machine load cell 305, the ammeter 306, the pinch roll speed, the pinch roll gap, and the pinch roll pressing force of the first transport machine 300A , First pinch roll 301A, first transporter power cylinder 302A, first transport motor 303A, first transporter speed meter 304A, first transporter load cell 305A, first ammeter 306A, first pinch roll speed, It is called the first pinch roll gap and the first pinch roll pressing force.
In addition, the pinch roll 301, the transport machine power cylinder 302, the transport motor 303, the transport machine speed meter 304, the transport machine load cell 305, the ammeter 306, the pinch roll speed, the pinch roll gap, and the pinch roll pressing of the second transport machine 300B The second pinch roll 301B, the second transporter power cylinder 302B, the second transport motor 303B, the second transporter speedometer 304B, the second transporter load cell 305B, the second ammeter 306B, and the second pinchroll respectively. It is called speed, second pinch roll gap, and second pinch roll pressing force.

The rolling mill 350 rolls the steel plate 10 conveyed from the second conveyance device 300B. The rolling mill 350 rolls while pulling the steel plate 10 and discharges the steel plate 10 in the transport direction. The rolling mill 350 includes a pair of rolling rolls 351, a pair of backup rolls 352, a rolling mill power cylinder 353, a rolling motor 354, a rolling mill speedometer 355, and a rolling mill load cell 356. The rolling mill 350 is an example of a discharge device that discharges the steel plate 10.
Each of the pair of rolling rolls 351 is a cylindrical roll, and can be rotated with the central axis as a rotation axis, and is arranged side by side so that the 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 plate 10 by rotating the steel plate 10 in opposite directions while sandwiching the steel plate 10 through the steel roll 10 in the rolling roll gap and applying a force for pressing the steel plate 10.
Each of the pair of backup rolls 352 is a cylindrical roll, is rotatable about the central axis as a rotation axis, and is arranged so as to be lined up and down across the pair of rolling rolls 351. The upper backup roll 352 is disposed on the upper side of the upper rolling roll 351 so as to come into contact with the upper rolling roll 351. The lower backup roll 352 is disposed below the lower rolling roll 351 so as to contact the lower rolling roll 351.

The rolling mill power cylinder 353 is a hydraulic servo cylinder, for example, and applies a force to the upper backup roll 352 to change the pressing force of the rolling mill or change the rolling roll gap. A rolling mill pressing force is applied to the steel plate 10 via the upper rolling roll 351 by the conveyor power cylinder 302. The rolling mill pressing force is a force by which the rolling roll 351 presses the steel plate 10 to roll the steel plate 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. A measurement value acquisition unit 559 of the control device 500 described later determines the rolling mill speed based on the measurement result of the rolling mill speedometer 355. The rolling mill speed is the speed of the surface of the rolling roll 351 and the speed of the steel sheet 10 passing through the rolling mill 350.
The rolling mill load cell 356 is a load cell that is attached to the lower backup roll 352 and measures the rolling mill pressing force.

Here, with reference to FIG. 2, transmission of rotation in the rolling mill 350 which is a mechanical tie type | mold is demonstrated. FIG. 2 is a side view of the rolling mill 350.
The rolling motor 354 rotates the lower rolling roll 351 via the shaft 360, the first gear 361A, the first front universal joint 362A, the first spindle 363A, and the first rear universal joint 364A.
The first gear 361A rotates the second gear 361B that meshes with the first gear 361A. The second gear 361B rotates the upper rolling roll 351 via the second front universal joint 362B, the second spindle 363B, and the second rear universal joint 364B.

Since the rolling mill 350 has such a configuration, the pair of rolling rolls 351 rotate at the same rotational speed. However, the upper rolling roll 351 and the lower rolling roll 351 have different diameters due to wear or the like. Therefore, when the pair of rolling rolls 351 are in a state where the pair of rolling rolls 351 are in contact with each other without rolling the steel sheet 10, a speed difference is generated at the contact portion, and torque is applied to the rolling roll 351. Therefore, as the pressing force of the rolling mill is stronger, torque is applied to the rolling roll 351 when the pair of rolling rolls 351 come into contact with each other.
However, in the control system 1, as will be described later, the pair of rolling rolls 351 are controlled so as not to contact each other, or even when there is a possibility of contact, control is performed so that the pressing force of the rolling mill is weak. As a result, the risk of damage to the rolling mill 350 is reduced.

Returning to FIG. 1, the description of the control system 1 will be continued.
The looper 400 is a counterbalance weight type looper and applies tension to the steel plate 10. The looper 400 includes a lifting roll 401, a counter balance weight 402, a wire 403, a pulley 404, a first auxiliary roll 405, a second auxiliary roll 406, and a potentiometer 407.
The elevating roll 401 is movable in the vertical direction, and by placing the elevating roll 401 on the transported steel plate 10 from above, a force based on the weight of the elevating roll 401 and the weight of the counter balance weight 402 is applied to the steel plate 10. Then, tension is generated in the steel plate 10.
The counter balance weight 402 is a weight for adjusting the tension applied to the steel plate 10.

The wire 403 reaches the counter balance weight 402 from the lifting roll 401 via the pulley 404 and connects the lifting roll 401 and the counter balance weight 402. When the counter balance weight 402 is lightened, the tension of the steel plate 10 is increased, and when the counter balance weight 402 is increased, the tension of the steel plate 10 is decreased.
The first auxiliary roll 405 is a roll that guides the steel plate 10 conveyed from the rolling mill 350 to the lifting roll 401 and is arranged at a preset height.
The second auxiliary roll 406 is a roll that guides the steel plate 10 that has passed through the elevating roll 401 to the coiler 450 and is arranged at a preset height.
The steel plate 10 passes above the first auxiliary roll 405, below the lifting roll 401, and above the second auxiliary roll 406. Therefore, a force based on the weight of the lifting roll 401 and the weight of the counter balance weight 402 is applied to the steel plate 10, and tension is generated in the steel plate 10.
The potentiometer 407 measures the vertical position of the lifting roll 401. The potentiometer 407 may measure information indicating the vertical position of the lifting roll 401 such as the position of the counter balance weight 402 or the predetermined position of the wire 403.

The coiler 450 pulls the steel plate 10 and winds the steel plate 10. The coiler 450 includes a coiler body 451, a first coiler roll 452, a second coiler roll 453, a pressurizing unit 454, a coiler motor 455, and a coiler speed meter 456.
The coiler body 451 is a bobbin, and the steel plate 10 is wound on the side surface.
The first coiler roll 452 and the second coiler roll 453 are disposed below the coiler body 451 and support the coiler body 451. Moreover, the 1st coiler roll 452 and the 2nd coiler roll 453 roll the steel plate 10 between the 1st coiler roll 452, the 2nd coiler roll 453, and the coiler main body 451 around the coiler main body 451 by rotating. Make it.
The pressurizing unit 454 applies a downward coiler pressing force to the coiler main body 451, presses the coiler main body 451 against the first coiler roll 452 and the second coiler roll 453, and stabilizes the coiler main body 451.
The coiler motor 455 rotates the first coiler roll 452 and the second coiler roll 453.
The coiler speed meter 456 measures the rotational speed of the coiler motor 455. A measurement value acquisition unit 559 of the control device 500 described later determines the coiler speed based on the measurement result of the coiler speedometer 456. The coiler speed is the speed of the surface of the first coiler roll 452 and is the speed at which the coiler 450 winds the steel plate 10.
The transporter 300 and the coiler 450 are examples of a drawing device that pulls in the steel plate 10.

  Next, the conveyance path | route of the steel plate 10 in the casting rolling equipment 100 is demonstrated. First, the steel plate 10 is discharged, for example, at 1600 ° C. from between a pair of casting rolls 201 of the twin roll type continuous casting machine 150. Next, the steel plate 10 passes between the pair of first pinch rolls 301A of the first transporter 300A and between the pair of second pinch rolls 301B of the second transporter 300B, and passes a pair of rolling of the rolling mill 350. It is rolled between rolls 351 and discharged to the looper 400 at 1000 ° C., for example. Next, the steel plate 10 passes under the lifting roll 401 of the looper 400 and is wound up by the coiler 450.

Next, the front area 601, the first intermediate area 602, the second intermediate area 603, and the rear area 604 in the casting and rolling equipment 100 will be described.
The front area 601 is an area between the twin-roll continuous casting machine 150 and the first transfer machine 300A. More specifically, the front area 601 is an area between the casting roll gap of the twin-roll continuous casting machine 150 and the first pinch roll gap of the first conveying machine 300A.
The first intermediate region 602 is a region between the first transport device 300A and the second transport device 300B. More specifically, the first intermediate region 602 is a region between the first pinch roll gap of the first transporter 300A and the second pinch roll gap of the second transporter 300B.
The second intermediate region 603 is a region between the second transporter 300B and the rolling mill 350. More specifically, the second intermediate region 603 is a region between the second pinch roll gap of the second conveyor 300 </ b> B and the rolling roll gap of the rolling mill 350.
The rear region 604 is a region between the rolling mill 350 and the coiler 450. More specifically, the rear region 604 is a region between the rolling roll gap of the rolling mill 350 and the coiler 450. The rear area 604 is an example of a determination area.

Next, the hardware configuration of the control device 500 will be described with reference to FIG. FIG. 3 is a hardware configuration diagram of the control device 500. The control device 500 is an example of a determination device.
The control device 500 is a computer such as a PLC (programmable logic controller) that controls the casting and rolling equipment 100, and includes a CPU 501, a storage device 502, a module 503, and a bus 504 connecting them.
The CPU 501 controls the entire control device 500. When the CPU 501 executes processing based on a program stored in the storage device 502 or the like, the functions of the control device 500 shown in FIG. 4 and the processing shown in FIGS. 14, 15, and 17 to 19 are realized. .

The storage device 502 is a RAM, ROM, HDD, or the like, and stores a program or saves temporary data used by the CPU 501.
The module 503 controls the apparatus of the casting and rolling equipment 100 associated with the module 503 via the network 700 based on a command from the CPU 501. There are a plurality of modules provided in the control device 500, and each module 503 is associated with a device of the casting and rolling equipment 100 such as a rolling motor 354 and a rolling mill load cell 356, for example. The module 503 may directly control the apparatus of the casting and rolling equipment 100 based on a command from the CPU 501, and controls the apparatus of the casting and rolling equipment 100 via an inverter or the like corresponding to the apparatus of the casting and rolling equipment 100. May be performed.

  The control device 500 has a function of virtually dividing the CPU 501 and can perform parallel processing. Moreover, CPU501 can acquire the information of the measuring device of the casting rolling equipment 100 via the module 503 corresponding to a measuring device. CPU501 may acquire the information of the measuring device of the casting rolling equipment 100 from the measuring device of the casting rolling equipment 100 via the communication interface with which the control apparatus 500 is provided. The measuring instrument of the casting and rolling equipment 100 is a device that acquires various types of information of the casting and rolling equipment 100, such as a camera 251, a load cell such as the casting machine load cell 203, a speedometer such as the casting machine speedometer 206, and a current. A total of 306 is included.

Next, functions of the control device 500 will be described with reference to FIG. FIG. 4 is a functional configuration diagram of the control device 500. The control device 500 includes a casting machine control unit 550, a molten steel control unit 551, a rolling mill control unit 552, a coiler control unit 553, a conveyor control unit 554, a breakage determination unit 555, an estimation unit 556, and a passage. The determination part 557, the process management part 558, and the measured value acquisition part 559 are provided.
The casting machine controller 550 controls the casting motor 205 via the module 503 to control the casting roll speed. The casting machine control unit 550 controls the casting machine power cylinder 204 via the module 503 to control the casting roll pressing force and the casting roll gap.

The molten steel control unit 551 controls the position of the stopper 162 via the module 503.
The rolling mill control unit 552 controls the rolling motor 354 via the module 503 to control the rolling mill speed. The rolling mill control unit 552 controls the rolling mill power cylinder 353 via the module 503 to control the rolling mill pressing force and the rolling roll gap.
The coiler control unit 553 controls the coiler motor 455 via the module 503 to control the coiler speed. The coiler control unit 553 controls the pressurizing unit 454 via the module 503 to control the coiler pressing force.

The transport machine control unit 554 controls the first transport motor 303A and the second transport motor 303B via the module 503 to control the first pinch roll speed and the second pinch roll speed. Further, the transporter control unit 554 controls the first transporter power cylinder 302A and the second transporter power cylinder 302B via the module 503, and the first pinch roll gap, the second pinch roll gap, the first The pinch roll pressing force and the second pinch roll pressing force are controlled.
The break determination unit 555 determines whether or not the steel plate 10 has broken in the front region 601. Further, the break determination unit 555 determines whether or not there is a break portion of the steel plate 10 in the rear region 604. The broken portion of the steel plate 10 is an end portion of the broken steel plate 10.
The estimation unit 556 estimates whether or not the steel plate 10 is broken in the first intermediate region 602 or the second intermediate region 603.

The passage determination unit 557 determines whether or not the fracture portion of the steel plate 10 has passed through the first transporter 300A or the second transporter 300B. More specifically, the passage determination unit 557 determines whether or not the fracture portion of the steel plate 10 has passed through the first pinch roll gap or the second pinch roll gap.
The process management unit 558 controls the operation of each function of the control device 500.
The measurement value acquisition unit 559 acquires the measurement value from the measuring instrument of the casting and rolling equipment 100.

[Rupture of steel plate in front area]
Next, with reference to FIG. 5 (a), (b), the fracture | rupture of the steel plate 10 in the front area | region 601 is demonstrated. FIG. 5A is a conceptual diagram of the front region 601 before the steel plate 10 is broken in the front region 601. FIG. 5B is a conceptual diagram of the front region 601 after the steel plate 10 is broken in the front region 601.
As shown in FIG. 5A, before the steel plate 10 breaks in the front region 601, the steel plate 10 discharged from the twin-roll continuous casting machine 150 first proceeds downward and then proceeds backward. It is lifted and proceeds to the first transporter 300A. Note that the rear is the direction in which the steel plate 10 is conveyed, and is the direction from the twin roll continuous casting machine 150 toward the first conveyor 300A when the casting and rolling equipment 100 is viewed from above.

  As shown in FIG. 5A, consider a case where the steel plate 10 is broken in the region of the steel plate 10 immediately after being discharged from the twin-roll continuous casting machine 150 in the front region 601. In this case, when the twin-roll continuous casting machine 150 continues to discharge the steel plate 10, the steel plate 10 is broken, and therefore, as shown in FIG. Reach 250 floors 253. Therefore, the break determination unit 555 can determine whether or not the steel plate 10 has broken in the front region 601 based on the lowest position of the steel plate 10 in the front region 601.

Next, the steel plate height 21 in the front region 601 will be described with reference to FIGS. The steel plate height 21 is the lowest position in the vertical direction in the front region 601 of the steel plate 10 connected to the casting roll gap. As shown in FIG. 5A, when the steel plate 10 is not broken in the front region 601, the steel plate height 21 is above the floor 253. As shown in FIG. 5B, when the steel plate 10 is broken in the front region 601, the steel plate height 21 is the same as the floor 253.
The camera 251 images the steel plate 10 in the front area 601. The measurement value acquisition unit 559 analyzes the image of the steel plate 10 taken by the camera 251 and acquires the steel plate height 21. The steel plate height 21 is determined based on the vertical position 20 where the camera 251 is disposed. In the present embodiment, the steel plate height 21 is expressed as a positive value when it is above the position 20 of the camera 251, and is expressed as a negative value when the steel plate height 21 is below the position 20 of the camera 251.

Next, with reference to FIG. 6, a method for determining whether or not the steel plate 10 has broken in the front region 601 by the break determination unit 555 will be described. FIG. 6 is a diagram illustrating an example of a steel plate height graph representing a time change of the steel plate height 21. Line 30 represents the first reference height. The first reference height is a value set in advance, and is a height that is a threshold value indicating that the steel plate 10 has broken in the front region 601. The first reference height is set to a height below the casting roll gap of the twin roll type continuous casting machine 150. The first reference height may be the height of the floor 253, or may be a position higher than the height of the floor 253 in consideration of an error in the steel plate height 21 acquired by the measurement value acquisition unit 559.
The break determination unit 555 determines that the steel plate 10 has broken in the front region 601 when the steel plate 10 reaches the first reference height, that is, when the steel plate height 21 is equal to or lower than the first reference height. . In the present embodiment, in order to prevent erroneous determination, the fracture determination unit 555 has a state in which the steel plate height 21 has reached the first reference height during the preset first reference time. When it continues, it determines with the steel plate 10 having fractured | ruptured in the front area | region 601. FIG.
In the example of FIG. 6, the steel sheet 10 is broken in the front region 601 at time 11 (sec). As shown in FIG. 6, after the steel plate 10 is ruptured, the steel plate height 21 rapidly decreases and reaches the first reference height. Therefore, the break determination unit 555 can determine that the steel plate 10 has been broken immediately after the steel plate 10 is broken in the front region 601.

[Rupture of steel plate in areas other than the front area]
Next, with reference to FIGS. 7A to 7D, the breaking of the steel plate 10 in the second intermediate region 603 that is a region other than the front region will be described. FIG. 7A is a diagram of the second intermediate region 603 and the rear region 604 before the steel plate 10 breaks in the second intermediate region 603. FIG. 7B is a diagram of the second intermediate region 603 and the rear region 604 after the steel plate 10 is broken in the second intermediate region 603. FIG. 7C is a diagram of the second intermediate region 603 and the rear region 604 when the fracture portion 15 reaches the rear region 604. FIG. 7D is a diagram of the second intermediate region 603 and the rear region 604 after the fracture portion 15 reaches the rear region 604.

First, as shown in FIG. 7A, it is assumed that the steel plate 10 is broken in the second intermediate region 603. In this case, as shown in FIG. 7B, the fracture portion 15 of the steel plate 10 on the coiler 450 side moves in the direction of the rolling mill 350 by the rotation of the rolling roll 351.
Thereafter, as shown in FIG. 7C, the fracture portion 15 passes through the rolling mill 350 and reaches the rear region 604 by the operation of winding the steel plate 10 by the coiler 450. When the fracture portion 15 reaches the rear region 604, the steel plate 10 is not sandwiched between the rolling rolls 351 of the rolling mill 350, so that the lifting roll 401 falls by its own weight to the lower limit position of the lifting roll 401. At this time, the counter balance weight 402 is pulled by the lifting roll 401 via the pulley 404 and moves upward. The lower limit position of the lifting roll 401 is the lowest position among the positions that the lifting roll 401 can take with the looper 400.

When the elevating roll 401 falls to the lower limit position of the elevating roll 401, as shown in FIG. 7 (d), the steel plate 10 is broken between the looper 400 and the coiler 450 due to the impact of the dropping of the elevating roll 401. There is.
Even when the steel plate 10 breaks in the rear region 604, the elevating roll 401 falls as shown in FIG. Therefore, the break determination unit 555 can determine whether or not the break portion 15 of the steel plate 10 exists in the rear region 604 based on the vertical position of the lifting roll 401. The condition that the rear region 604 has the fractured portion 15 of the steel sheet 10 satisfies the condition that the fractured portion 15 reaches the rear region 604 after the steel plate 10 is fractured in the first intermediate region 602 or the second intermediate region 603, and This is a case where the steel plate 10 is broken at the rear region 604.

  Next, the looper height 41 will be described with reference to FIG. FIG. 8 is a side view of the looper 400. The looper height 41 is the vertical position of the lifting roll 401 and represents the height of the lifting roll 401. The looper height 41 is determined with reference to a preset position 40 in the vertical direction. In the present embodiment, the looper height 41 is expressed as a positive value when it is above the position 40, and is expressed as a negative value when it is below the position 40. The looper height 41 is measured by a potentiometer 407.

Next, a method for determining whether or not the fracture portion 15 of the steel sheet 10 is present in the rear region 604 by the fracture determination portion 555 will be described with reference to FIG. FIG. 9 shows an example of a looper height graph representing a temporal change in the looper height. Line 31 represents the second reference height. The second reference height is a value that is set in advance and is a height that is a threshold value indicating that the fracture portion 15 is in the rear region 604.
The break determination unit 555 determines that the break portion 15 of the steel sheet 10 is present in the rear region 604 when the looper height 41 is equal to or less than the second reference height. In the present embodiment, in order to prevent erroneous determination, the fracture determination unit 555 has a state in which the looper height 41 is equal to or lower than the second reference height during the second reference time set in advance. When continuing, it determines with the fracture | rupture part 15 of the steel plate 10 being in the back area | region 604. FIG. The second reference height is an example of a roll reference height.
In the example of FIG. 9, after time 12.9 (sec), as shown in FIG. 7C, the fracture portion 15 reaches the rear region 604, or the steel plate 10 breaks in the rear region 604. This represents that the fracture portion 15 exists in the rear region 604. At this time, as shown in FIG. 9, the looper height decreases after time 12.9 (sec), and reaches the second reference height at time 13.15 (sec). Therefore, the break determination unit 555 can determine that the break portion 15 of the steel sheet 10 is present in the rear region 604 at time 13.15 (sec).

Next, how to determine the second reference height will be described with reference to FIG. FIG. 10 is a diagram illustrating an example of a looper height / speed graph representing temporal changes in the looper height, the coiler speed, and the first pinch roll speed. The first line 50 represents the coiler speed (mpm (meters / minute)), the second line 51 represents the first pinch roll speed (mpm), and the third line 52 represents the looper height (mm). In FIG. 10, the first line 50 and the second line 51 are substantially coincident.
The looper height / speed graph in FIG. 10 represents a state when the steel sheet 10 is not normally broken and is normally rolled by the rolling mill 350.
The second reference height is the lower limit value of the normal range of the looper height. The normal range of the looper height is a range in which the looper height can be accommodated when the rolling mill 350 is normally rolled. The lower limit value of the normal range of the looper height is a value representing the lowermost part in the normal range of the looper height. In the example of FIG. 10, the looper height is in the range from +100 (mm) to −100 (mm), but the normal range of the looper height is changed from +150 (mm) in consideration of changes in operating conditions. Set to -150 (mm). Therefore, in the example of FIG. 10, the second reference height is −150 (mm).

[Estimation of steel sheet breakage]
Next, with reference to FIGS. 11A and 11B, the estimation unit 556 determines whether or not the steel plate 10 has broken in the first intermediate region 602 based on the amount of change in the current flowing through the first transport motor 303A. A method for estimating this will be described. FIG. 11A is a diagram illustrating an example of a current differential value graph representing a temporal change in the current differential value of the first transport motor 303A. The current differential value of the first transport motor 303A is a value obtained by differentiating the value of the current flowing through the first transport motor 303A. FIG.11 (b) is a figure which shows the example of the pinch roll speed graph showing the time change of the 1st pinch roll speed.

  11 (a) and 11 (b), the casting and rolling equipment 100 is in a steady casting state from time 0 (sec) to time 12 (sec), and the steel plate 10 in the first intermediate region 602 at time 12 (sec). Is broken. The steady casting state of the casting and rolling equipment 100 is a state in which the steel plate 10 is not broken in the casting and rolling equipment 100 and casting by the twin roll continuous casting machine 150 or rolling by the rolling mill 350 is normally performed. is there. FIGS. 11A and 11B are graphs obtained by simulation modeling the casting and rolling equipment 100.

  When the casting and rolling equipment 100 is in a steady casting state, the speed of the steel plate 10 is substantially constant. Further, the tension of the steel plate 10 is also kept substantially constant, and the torque of the first transport motor 303A that rotates the first pinch roll 301A is also substantially constant. Here, as already described, the torque of the first transport motor 303A is proportional to the value of the current flowing through the first transport motor 303A. Therefore, when the casting and rolling equipment 100 is in a steady casting state, the current differential value of the first transport motor 303A is almost zero because the current of the first transport motor 303A is substantially constant.

When the steel plate 10 is broken in the first intermediate region 602, the tension of the steel plate 10 is rapidly reduced, and the torque applied to the first transport motor 303A varies greatly. Accordingly, since the current of the first transport motor 303A also varies greatly, the current differential value of the first transport motor 303A also varies greatly. Also in the example of FIG. 11A, it can be seen that the current differential value of the first transport motor 303A greatly fluctuates in a pulse shape at the time 12 (sec) when the steel plate 10 breaks in the first intermediate region 602.
Further, when the steel plate 10 is broken in the first intermediate region 602, the first pinch roll speed is greatly changed by an impact in which the tension of the steel plate 10 is rapidly changed. Also in the example of FIG. 11B, the pinch roll speed of the first pinch roll 301 </ b> A greatly fluctuates at time 12 (sec) when the steel plate 10 broke in the first intermediate region 602.

  From such a fact, the estimation unit 556 estimates whether or not the steel plate 10 has broken in the first intermediate region 602 based on the amount of change in the current flowing through the first transport motor 303A acquired from the first ammeter 306A. To do. More specifically, the estimation unit 556 estimates that the steel plate 10 has broken in the first intermediate region 602 when the current differential value of the first transport motor 303A is equal to or greater than the change amount threshold value. The change amount threshold value is a preset value, and is a value that is a threshold value for estimating the breakage of the steel sheet 10 using the current differential value of the first transport motor 303A. The change amount threshold is determined based on the current differential value graph shown in FIG. In the example of FIG. 11A, the change amount threshold is set to 1000 (A / sec), for example.

After the steel plate 10 breaks in the first intermediate region 602, the current differential value of the first transport motor 303A approaches 0 as shown in FIG. 11A, and the pinch roll speed of the first pinch roll 301A is As shown in FIG. 11 (b), it approaches a constant speed.
Here, the time from the start of the pulse-like fluctuation of the pinch roll speed due to the breakage of the steel sheet 10 to the disappearance of the pulse-like fluctuation is called a hunting convergence time. From the example of FIG. 11B, the hunting convergence time can be determined to be 0.5 (sec), for example.

Next, the estimation unit 556 determines whether or not the steel plate 10 has broken in at least one of the first intermediate region 602 and the second intermediate region 603 based on the amount of change flowing in the current of the second transport motor 303B. An estimation method will be described.
When the steel plate 10 is broken in at least one of the first intermediate region 602 and the second intermediate region 603, the current differential value of the second transport motor 303B and the second pinch roll speed are shown in FIG. It becomes the same value as the current differential value graph and pinch roll speed graph as shown in (b). This is because when the steel plate 10 breaks in at least one of the first intermediate region 602 and the second intermediate region 603, the change in the tension of the steel plate 10 is transmitted to the second pinch roll 301B, and the torque of the second transport motor 303B is increased. This is because it fluctuates.
The estimating unit 556 breaks the steel plate 10 in at least one of the first intermediate region 602 and the second intermediate region 603 based on the amount of change in the current flowing through the second transport motor 303B acquired from the second ammeter 306B. Estimate whether or not More specifically, when the current differential value of the second transport motor 303B is equal to or greater than the change amount threshold value, the estimation unit 556 detects the steel plate 10 in at least one of the first intermediate region 602 and the second intermediate region 603. Is estimated to have broken.

Next, a description will be given of the possibility that the estimation unit 556 estimates that the steel plate 10 is broken by mistake even though the steel plate 10 is not broken.
First, the hot band 13 of the steel plate 10 as an example of the disturbance will be described with reference to FIGS. 12 (a), 12 (b), and 12 (c). FIG. 12A is a perspective view of the casting part 200 of the twin-roll continuous casting machine 150. FIG. 12B is a plan view of the casting part 200. FIG. 12C is a perspective view of the steel plate 10 on which the hot band 13 is formed.
As shown in FIG. 12C, the hot band 13 is a thick portion of the steel plate 10 formed by the ingot 12 on the side surface of the weir 202 entering during casting. In the metal 12 on the side surface of the weir 202 as shown in FIG. 12A, the molten steel 11 attached to the side surface of the weir 202 is solidified due to fluctuations in the molten metal surface level (surface height of the molten steel 11) during casting. Is formed.
The base metal 12 on the side surface of the weir 202 may be peeled off from the weir 202 due to an impact during casting or the like, and may enter between the pair of casting rolls 201 as shown in FIG. When the base metal 12 enters between the pair of casting rolls 201, the distance between the pair of casting rolls 201 is opened due to the hardness of the base metal 12, and the hot band 13 is formed as shown in FIG. The steel plate 10 is discharged from the twin roll continuous casting machine 150.

Next, an example in which the estimation unit 556 estimates that the steel plate 10 has been broken by mistake will be described with reference to FIG. FIG. 13 is a diagram illustrating an example of a current differential value graph of the first transport motor 303A. FIG. 13 is a graph obtained by a simulation modeling the casting and rolling equipment 100.
FIG. 13 shows an example in which the hot band 13 of the steel plate 10 passes between the pair of first pinch rolls 301A at time 11 (sec).
When the hot band 13 of the steel plate 10 passes through the first pinch roll 301A, the distance between the pair of first pinch rolls 301A changes rapidly. Due to this change, the torque of the first transport motor 303A that rotates the first pinch roll 301A changes rapidly. Therefore, as shown in the vicinity of time 11 (sec) in FIG. 13, the current of the first transport motor 303 </ b> A varies rapidly, and the current differential value of the first transport motor 303 </ b> A varies greatly.
Depending on the size of the hot band 13, the speed of the steel plate 10, etc., when the hot band 13 passes the first pinch roll 301 </ b> A, the current differential value of the first transport motor 303 </ b> A may be greater than or equal to the change amount threshold value. In this case, the estimation unit 556 estimates that the steel plate 10 has been broken by mistake.

Next, a method for determining whether or not the fracture portion 15 of the steel plate 10 has passed through the first transporter 300A by the passage determination unit 557 after the steel plate 10 has broken in the front region 601 will be described.
After the steel plate 10 is ruptured in the front region 601, the steel plate 10 that is closer to the first conveying machine 300A than the rupture portion 15 is conveyed to the coiler 450 side, and when time passes, the rupture portion 15 becomes a pair. Passes between the first pinch rolls 301A. When the breaking portion 15 passes between the pair of first pinch rolls 301A, the steel plate 10 does not exist between the pair of first pinch rolls 301A. Therefore, the first conveyance motor 303A that rotates the first pinch roll 301A is used. Torque fluctuates rapidly. Therefore, as in FIG. 11A and FIG. 13, the current differential value of the first transport motor 303A varies greatly.

  From such a fact, the passage determining unit 557 has the fracture portion 15 of the steel plate 10 passed through the first transport device 300A based on the amount of change in the current flowing through the first transport motor 303A acquired from the first ammeter 306A. It is determined whether or not. More specifically, the passage determination unit 557 determines that the breaking portion 15 has passed between the pair of first pinch rolls 301A when the current differential value of the first transport motor 303A is equal to or greater than the transport threshold. The conveyance threshold value is a preset value, and is a threshold value that indicates that the breaking portion 15 has passed between the pair of pinch rolls 301. The conveyance threshold value is determined based on a current differential value graph as shown in FIG. 11A when the fracture portion 15 passes between the pair of pinch rolls 301. In the present embodiment, the transport threshold is set to 500 (A / sec). Similarly, the passage determination unit 557 determines whether or not the fracture portion 15 of the steel sheet 10 has passed through the second transport device 300B based on the amount of change in the current flowing through the second transport motor 303B acquired from the second ammeter 306B. Determine.

[Casting and rolling control processing]
Next, the casting and rolling control process will be described with reference to FIG. FIG. 14 is a flowchart of the casting and rolling control process. The casting and rolling control process is a process for controlling the casting and rolling equipment 100 to perform casting and rolling of the steel sheet 10.
In step S100, the process management unit 558 acquires various parameters of the casting and rolling equipment 100 by referring to the storage device 502 or receiving information from an external device through network communication. And the process management part 558 initializes so that the casting rolling equipment 100 may perform the operation | movement corresponding to the acquired various parameters. The various parameters acquired by the process management unit 558 include target parameters representing target values in the steady casting state. The target parameters include a target casting parameter that represents a casting target of the twin roll continuous casting machine 150 and a target rolling parameter that represents a rolling target of the rolling mill 350. The target rolling mill pressing force included in the target rolling parameters is, for example, 200 (tonf), and the target first pinch roll pressing force and the second pinch roll pressing force are, for example, 1 (tonf). .

In step S101, the casting machine control unit 550 and the molten steel control unit 551 start control of the twin-roll continuous casting machine 150 based on the target parameter. In addition, the rolling mill control unit 552 starts control of the rolling mill 350 based on the target parameter. Further, the transporter control unit 554 starts control of the transporter 300 based on the target parameter. Moreover, the coiler control part 553 starts control of the coiler 450 based on a target parameter. Thus, casting and rolling are started, and the casting and rolling equipment 100 is in a steady casting state.
In step S102, the process management unit 558 performs control for starting the processes in steps S103, S108, and S113 in parallel.

In step S103, the measurement value acquisition unit 559 acquires the steel plate height 21 based on the image captured by the camera 251. Based on the steel plate height 21, the break determination unit 555 determines whether or not the steel plate 10 is broken in the front region 601 between the twin roll continuous casting machine 150 and the first transporter 300A. More specifically, as described with reference to FIG. 6, the fracture determination unit 555 determines that the steel plate 10 continues for a preset first reference time and the steel plate height 21 is the first reference. When the height is equal to or less than the height, it is determined that the steel plate 10 is broken in the front region 601.
When it is determined that the steel sheet 10 is broken in the front region 601, the break determination unit 555 proceeds to step S104, and when it is determined that the steel sheet 10 is not broken, the break determination unit 555 executes step S103 again.

In step S104, the process management unit 558 performs control for starting the processes in steps S105 and S106 in parallel.
In step S105, the control device 500 executes a casting machine stop control process described later.
In step S106, the control device 500 executes a first break control process described later.
In step S107, the process management unit 558 ends the process of FIG. 14 after the processes of step S105 and step S106 are completed.

In step S <b> 108, the measurement value acquisition unit 559 acquires the looper height 41 from the potentiometer 407. Then, the break determination unit 555 determines, based on the looper height 41, whether or not there is a break portion in the rear region 604 that is a region between the rolling mill 350 and the coiler 450. More specifically, as described with reference to FIG. 9, the fracture determination unit 555 determines that the steel plate 10 continues for the second reference time set in advance, and the looper height 41 is the second reference. When the height is equal to or less than the height, it is determined that there is a fracture portion of the steel plate 10 in the rear region 604.
When it determines with the fracture | rupture determination part 555 having the fracture | rupture part of the steel plate 10 in the back area | region 604, a process is advanced to step S109, and when it determines with the fracture | rupture part of the steel plate 10 not being in the back area | region 604, step S108 is performed again. .

In step S109, the process management unit 558 performs control for starting the processes in steps S110 and S111 in parallel.
In step S110, the control device 500 executes a casting machine stop control process described later.
In step S111, the control device 500 executes a second break control process described later.
In step S112, the process management unit 558 ends the process of FIG. 14 after the processes of step S110 and step S111 are completed.

In step S113, the process management unit 558 performs control for starting the processes in steps S114 and S115 in parallel.
In step S114, the measurement value acquisition unit 559 acquires the value of the current flowing from the first ammeter 306A to the first transport motor 303A. The estimation unit 556 is based on the amount of change in the current flowing through the first transport motor 303A acquired by the measurement value acquisition unit 559, in the first intermediate region 602 between the first transport device 300A and the second transport device 300B. Then, it is estimated whether or not the steel plate 10 is broken. More specifically, as already described, the estimation unit 556 estimates that the steel plate 10 has broken in the first intermediate region 602 when the current differential value of the first transport motor 303A is greater than or equal to the change amount threshold value. To do.
The estimation unit 556 proceeds to step S116 when it is estimated that the steel plate 10 is broken in the first intermediate region 602, and executes step S114 again when it is not estimated that the steel plate 10 is broken in the first intermediate region 602.

In step S115, the measurement value acquisition unit 559 acquires the value of the current flowing from the second ammeter 306B to the second transport motor 303B. Based on the amount of change in the current flowing through the second transport motor 303B acquired by the measurement value acquisition unit 559, the estimation unit 556 includes a first intermediate region 602 between the first transport device 300A and the second transport device 300A, And it is estimated whether the steel plate 10 fractured | ruptured in at least any one of the 2nd intermediate | middle area | region 603 between the 2nd conveying machine 300A and the rolling mill 350. FIG. More specifically, as already described, the estimation unit 556, when the current differential value of the second transport motor 303B is equal to or greater than the change amount threshold value, the first intermediate region 602 and the second intermediate region 603. It is estimated that the steel plate 10 is broken at least in any one of the above.
When the estimation unit 556 estimates that the steel plate 10 has broken in at least one of the first intermediate region 602 and the second intermediate region 603, the process proceeds to step S116, and the first intermediate region 602 and the second intermediate region When it is not estimated that the steel plate 10 has broken in at least one of the regions 603, step S115 is executed again.

In step S116, when the process proceeds to step S116 from either step S114 or step S115, the process management unit 558 proceeds to step S117.
In step S117, the rolling mill control unit 552 executes a fracture estimation time control process described later. Thereafter, the process returns to step S113.

Next, the casting machine stop control process will be described with reference to FIGS. 15 and 16A to 16D. FIG. 15 is a flowchart of the casting machine stop control process. FIGS. 16A to 16D are views showing a state when the twin-roll continuous casting machine 150 is stopped.
In step S <b> 200, the molten steel control unit 551 performs control to stop the injection of the molten steel 11 into the hot water pool 210. More specifically, the molten steel control unit 551 controls the stopper 162 to close the spout of the tundish 161. Accordingly, as shown in FIG. 16A, the stopper 162 moves downward, the spout of the tundish 161 is closed, and the injection of the molten steel 11 into the hot water pool 210 is stopped.
In step S <b> 201, the casting machine control unit 550 performs control to reduce the rotation speed of the casting roll 201. More specifically, the casting machine control unit 550 decreases the rotation speed of the casting motor 205 so that the casting roll speed is slower than the casting roll speed for satisfying the casting target, and the rotation speed of the casting roll 201 is reduced. By lowering, control to lower the casting roll speed is performed.

In step S202, the casting machine control unit 550 determines whether or not the discharge time has elapsed since the process of step S201 was performed. The discharge time is a time set in advance as a time until the molten steel 11 accumulated in the hot water pool 210 is discharged from the hot water pool 210. The casting machine controller 550 advances the process to step S203 when the discharge time has elapsed, and executes step S202 again when it has not elapsed.
By stopping the injection of the molten steel 11 into the hot water pool 210, the amount of the molten steel 11 in the hot water pool 210 decreases as shown in FIG. When the discharge time further elapses, the molten steel 11 disappears in the hot water pool 210 as shown in FIG.

In step S <b> 203, the casting machine control unit 550 performs control to stop the rotation of the casting roll 201 by stopping the rotation of the casting motor 205.
In step S204, the casting machine control unit 550 performs control to open the casting roll 201. More specifically, as shown in FIG. 6 (d), the casting machine control unit 550 controls the casting machine power cylinder 204 to widen the distance between the pair of casting rolls 201, so that the pair of casting rolls 201. Control so that the distance between them is maximized. The twin-roll continuous casting machine 150 of this embodiment automatically moves so that the distance between the pair of casting rolls 201 becomes maximum when the power is turned off. In step S204, since the distance between the pair of casting rolls 201 is maximized in advance, even if the power is turned off, a situation in which the distance between the pair of casting rolls 201 suddenly increases can be avoided.

Next, the first break control process will be described with reference to FIG. FIG. 17 is a flowchart of the first break control process.
In step S300, the transport controller control unit 554 performs control to reduce the rotation speed of the first pinch roll 301A and the second pinch roll 301B. More specifically, the transport controller 554 determines that the first pinch roll speed and the second pinch roll speed are the first pinch roll speed and the second pinch roll speed at which the target values in the steady casting state are set. Control is performed to lower the rotation speeds of the first pinch roll 301A and the second pinch roll 301B by lowering the rotation speeds of the first conveyance motor 303A and the second conveyance motor 303B so as to be slower.
In addition, the rolling mill control unit 552 performs control to reduce the rotation speed of the rolling roll 351. More specifically, the rolling mill control unit 552 decelerates the rotation of the rolling motor 354 so that the rolling mill speed becomes slower than the rolling mill speed that is the target value in the steady casting state, and the rolling roll 351 rotates. Control to reduce the speed.
Moreover, the coiler control part 553 performs control which reduces the speed of winding of the steel plate 10 by a coiler. More specifically, the coiler control unit 553 reduces the rotational speed of the coiler motor 455 so that the coiler speed is lower than the coiler speed that is the target value in the steady casting state, and the coiler winds up the steel sheet 10. Control to reduce the speed.
The first pinch roll speed, the second pinch roll speed, the rolling mill speed, and the coiler speed before deceleration are the same speed, which is 80 (mpm) in this embodiment.
The first pinch roll speed, the second pinch roll speed, the rolling mill speed, and the coiler speed after deceleration are the same speed, which is 5 (mpm) in this embodiment.

In step S301, the rolling mill control unit 552 performs control to open the rolling roll 351. More specifically, the rolling mill control unit 552 controls the rolling mill power cylinder 353 to increase the distance between the pair of rolling rolls 351 so that at least one of the rolling rolls 351 is separated from the steel plate 10. And the rolling of the steel sheet 10 by the rolling roll 351 is stopped.
In step S302, the measurement value acquisition unit 559 acquires the value of the current flowing from the first ammeter 306A to the first transport motor 303A. The passage determination unit 557 determines whether or not the fracture portion of the steel sheet 10 has passed through the first pinch roll 301A based on the obtained change amount of the current flowing through the first transport motor 303A. More specifically, the passage determination unit 557 determines that the fracture portion of the steel sheet 10 has passed through the first pinch roll 301A when the current differential value of the first transport motor 303A is equal to or greater than the transport threshold.
The passage determining unit 557 advances the process to step S303 when it is determined that the fracture portion of the steel plate 10 has passed the first pinch roll 301A, and otherwise executes step S302 again.

In step S303, the transport machine control unit 554 performs control to open the first pinch roll 301A. More specifically, the transporter control unit 554 controls the first transporter power cylinder 302A to increase the distance between the pair of first pinch rolls 301A more than in the steady casting state.
In step S304, the transport machine control unit 554 performs control to stop the rotation of the first transport motor 303A, stop the rotation of the first pinch roll 301A, and stop the transport by the first transport machine 300A.
In step S305, the transport controller control unit 554 determines whether or not the hunting convergence time has elapsed since the fracture portion of the steel plate 10 passed through the first pinch roll 301A. The transporter control unit 554 advances the process to step S306 when the hunting convergence time has elapsed, and executes step S305 again when it has not elapsed.

In step S306, the measurement value acquisition unit 559 acquires the value of the current flowing from the second ammeter 306B to the second transport motor 303B. The passage determination unit 557 determines whether or not the fracture portion of the steel sheet 10 has passed the second pinch roll 301B based on the obtained change amount of the current flowing through the second transport motor 303B. More specifically, the passage determination unit 557 determines that the fracture portion of the steel plate 10 has passed the second pinch roll 301B when the current differential value of the second transport motor 303B is equal to or greater than the transport threshold.
The passage determination unit 557 advances the process to step S307 when determining that the fracture portion of the steel plate 10 has passed the second pinch roll 301B, and otherwise executes step S306.

In step S307, the transport machine control unit 554 performs control to open the second pinch roll 301B. More specifically, the transporter control unit 554 controls the second transporter power cylinder 302B so as to increase the distance between the pair of second pinch rolls 301B more than in the steady casting state.
In step S308, the transport machine control unit 554 performs control to stop the rotation of the second transport motor 303B, stop the rotation of the second pinch roll 301B, and stop the transport by the second transport machine 300B. In addition, the rolling mill control unit 552 performs control to stop the rotation of the rolling roll 351 by stopping the rotation of the rolling motor 354. The coiler control unit 553 performs control to stop the winding of the steel plate 10 by stopping the rotation of the coiler motor 455.

Next, the second break control process will be described with reference to FIG. FIG. 18 is a flowchart of the second break control process.
In step S400, the transport machine control unit 554 performs control to stop the rotation of the first transport motor 303A, stop the rotation of the first pinch roll 301A, and stop the transport by the first transport machine 300A. Further, the transport machine control unit 554 performs control to stop the rotation of the second transport motor 303B, stop the rotation of the second pinch roll 301B, and stop the transport by the second transport machine 300B. In addition, the rolling mill control unit 552 performs control to stop the rotation of the rolling roll 351 by stopping the rotation of the rolling motor 354. The coiler control unit 553 performs control to stop the winding of the steel plate 10 by stopping the rotation of the coiler motor 455.
In step S401, the rolling mill control unit 552 performs control to open the rolling roll 351, similarly to step S301 in FIG.
In step S402, the transport machine control unit 554 performs control to open the first pinch roll 301A, similarly to step S303 in FIG.
In step S403, the transporter control unit 554 performs control to open the second pinch roll 301B, similarly to step S307 in FIG.

Next, the fracture estimation time control process will be described with reference to FIG. FIG. 19 is a flowchart of the fracture estimation time control process.
In step S500, the rolling mill control unit 552 performs control so that the rolling mill 350 lightly lowers the steel plate 10. More specifically, the rolling mill control unit 552 controls the rolling mill power cylinder 353 so as to make the rolling mill pressing force weaker than that in the steady casting state. In this embodiment, the rolling mill pressing force weaker than that in the steady casting state is 1 (tonf).

In step S501, the rolling mill control unit 552 determines whether or not the erroneous detection determination time has elapsed since the process of step S500 was performed. The erroneous detection determination time represents the time from when the steel plate 10 is broken in at least one of the first intermediate region 602 and the second intermediate region 603 until the broken portion of the steel plate 10 reaches the rear region 604. As the erroneous detection determination time, a time longer than the time from when the steel plate 10 reaches the first transporter 300A until it reaches the rolling mill 350 can be used. In the present embodiment, the erroneous detection determination time is 1 (sec). When the steel plate is actually broken in the first intermediate region 602 or the second intermediate region 603, the broken portion of the steel plate 10 reaches the rear region 604 before the erroneous detection determination time elapses. Can determine that the fracture portion of the steel sheet 10 has reached the rear region 604, and the second fracture control process of FIG. 18 is executed.
The rolling mill control unit 552 advances the process to step S502 when the erroneous detection determination time has elapsed, and executes step S501 again when it has not elapsed.

If the estimation unit 556 estimates the fracture of the steel plate 10 in step S114 or step S115 of FIG. 14 and this estimation is correct and the steel plate 10 actually breaks, the process does not proceed from step S501 to step S502. The control process at the time of 19 fracture estimation ends. This point will be described next.
As described with reference to FIG. 14, after step S102, the processes of step S103, step S108, and step S113 are started in parallel. Therefore, in step S114 or step S115 ahead of the process of step S113, when the estimation unit 556 estimates the fracture of the steel sheet 10, step S501 and step S108 ahead of the process of step S114 and step S115 are parallel. To work.
Here, let us consider a case where the estimation in step S114 or step S115 in FIG. 14 is correct and the steel plate 10 is actually broken. In this case, in the fracture estimation time control process of FIG. 19, the process does not proceed from step S501 for the erroneous detection determination time. And the fracture | rupture part of the steel plate 10 reaches the back area | region 604 between false detection determination time. Therefore, in step S108 that operates in parallel with step S501, the fracture determination unit 555 determines that there is a fractured portion of the steel plate 10 in the rear region 604, and the casting machine stop control process in step S110 and the second in step S111. After the fracture control process is finished, the casting and rolling control process of FIG. 14 is finished. The fracture estimation time control process of FIG. 19 is a process included in the casting and rolling control process of FIG. 14, and the fracture estimation time control process of FIG. 19 ends when the casting and rolling control process of FIG. 14 ends.
Therefore, when the estimation unit 556 estimates the fracture of the steel plate 10 in step S114 or step S115 of FIG. 14 and this estimation is correct and the steel plate 10 actually breaks, the process does not proceed from step S501 to step S502. The control process at the time of fracture estimation in FIG. 19 ends.

  In step S502, the rolling mill control unit 552 controls the rolling mill 350 so that the rolling mill 350 is in a steady casting state. More specifically, the rolling mill control unit 552 controls the rolling mill 350 so as to satisfy the rolling target. Therefore, in step S502, the state where the rolling mill 350 lightly lowers the steel sheet 10 is released, and the rolling mill pressing force returns to the state before step S500.

[First operation example]
Next, a first operation example of the control system 1 will be described with reference to FIGS.
The first operation example is a steady casting state until time 20 (sec), and is an operation example of the control system 1 when the steel plate 10 is broken in the front region 601 at time 20 (sec). At time 20 (sec), the break determination unit 555 determines that the steel plate 10 has broken in the front region 601 in step S103 of FIG.
First, with reference to FIG. 20 (a), (b), the state change of the twin roll type continuous casting machine 150 in a 1st operation example is demonstrated. Fig.20 (a) is a figure which shows the casting roll speed graph showing the time change of the casting roll speed in the 1st operation example. FIG. 20B is a diagram showing a casting roll gap representing a change over time in the size of the casting roll gap in the first operation example.
As shown in FIG. 20 (a), at the time 20 (sec), the casting roll speed starts to decrease in the processing of FIG. 15, and the casting roll speed is changed from 80 (mpm) to 5 (mpm). Moreover, after 1 (sec) which is discharge | emission time passes, a casting roll speed begins to fall again, and a casting roll speed becomes 0 (mpm). Furthermore, as shown in FIG.20 (b), a casting roll is open | released and the distance between a pair of casting roll 201 spreads to 50 (mm).

Next, with reference to FIGS. 21A and 21B, a state change of the first transporter 300A in the first operation example will be described. FIG. 21A is a diagram showing a first pinch roll speed graph showing a time change of the first pinch roll speed in the first operation example. FIG. 21B is a diagram illustrating a first pinch roll gap graph representing a time change of the first pinch roll gap in the first operation example.
As shown in FIG. 21A, by the process of FIG. 17, at the time 20 (sec), the first pinch roll speed starts to decrease, and the first pinch roll speed changes from 80 (mpm) to 5 (mpm). .
Further, in the first operation example, at time 22 (sec) 2 (sec) after the steel plate 10 breaks in the front region 601, the broken portion of the steel plate 10 passes through the first pinch roll 301A. The passage determination unit 557 determines that the fracture portion of the steel sheet 10 has passed the first pinch roll 301A at time 22 (sec) in step S302 of FIG.
At time 22 (sec), as shown in FIG. 21A, the first pinch roll speed starts to decrease and the first pinch roll speed becomes 0 (mpm) by the process of FIG. Further, the first pinch roll 301A is opened, and the distance between the pair of first pinch rolls 301A is increased to 50 (mm).

Next, with reference to FIGS. 22A and 22B, a state change of the second transporter 300B in the first operation example will be described. FIG. 22A is a diagram illustrating a second pinch roll speed graph showing a time change of the second pinch roll speed in the first operation example. FIG. 22B is a diagram showing a second pinch roll gap graph showing a time change of the second pinch roll gap in the first operation example.
As shown in FIG. 21 (a), the second pinch roll speed starts to decrease at time 20 (sec) and the second pinch roll speed is changed from 80 (mpm) to 5 (mpm) by the process of FIG.
Further, in the first operation example, the fracture portion of the steel plate 10 passes through the second pinch roll 301B at time 23 (sec) 3 (sec) after the steel plate 10 is broken in the front region 601. The passage determination unit 557 determines that the fracture portion of the steel plate 10 has passed the second pinch roll 301B at time 23 (sec) in step S306 of FIG.
At time 23 (sec), the process of FIG. 17 causes the second pinch roll speed to decrease again, and the second pinch roll speed becomes 0 (mpm), as shown in FIG. 22 (a). Moreover, as shown in FIG.22 (b), the 2nd pinch roll 301B is open | released and the distance between a pair of 2nd pinch roll 301B spreads to 50 (mm).

Next, a state change of the rolling mill 350 in the first operation example will be described with reference to FIGS. Fig.23 (a) is a figure which shows the rolling mill speed graph showing the time change of the rolling mill speed in a 1st operation example. FIG. 23B is a diagram showing a rolling roll gap graph showing a change with time of the rolling roll gap in the first operation example. FIG.23 (c) is a figure which shows the rolling mill pressing force graph showing the time change of the rolling mill pressing force in a 1st operation example.
As shown in FIG. 23 (a), at the time 20 (sec), the rolling mill speed starts to decrease and the rolling mill speed changes from 80 (mpm) to 5 (mpm) by the process of FIG. And when the fracture | rupture part of the steel plate 10 passed the 2nd pinch roll 301B, the rolling mill speed begins to fall again and the rolling mill speed becomes 0 (mpm). Further, as shown in FIG. 23 (b), by the process of FIG. 17, the rolling roll 351 is opened at time 20 (sec), and the distance between the pair of rolling rolls 351 is increased to 50 (mm). Further, as shown in FIG. 23 (c), at time 20 (sec), the distance between the pair of rolling rolls 351 begins to increase, and the rolling mill 350 does not roll the steel plate 10. Therefore, at time 20 (sec). When the rolling mill pressing force drops from 200 (tonf) to 0 (tonf).

Next, with reference to FIG. 24, the state change of the coiler 450 in the first operation example will be described. FIG. 24 is a diagram illustrating a coiler speed graph representing a temporal change in the coiler speed in the first operation example.
As shown in FIG. 24, at the time 20 (sec), the coiler speed starts to decrease and the coiler speed is changed from 80 (mpm) to 5 (mpm) by the process of FIG. And when the fracture | rupture part of the steel plate 10 passes the 2nd pinch roll 301B, the coiler speed begins to fall again and the coiler speed becomes 0 (mpm) again.

[Second operation example]
Next, a second operation example of the control system 1 will be described with reference to FIGS. 25 to 28.
The second operation example is a steady casting state until time 20 (sec), and the control system 1 in the case where the steel plate 10 breaks in the rear region 604 and the lifting roll 401 falls at time 20 (sec). It is an operation example. At time 20 (sec), the break determination unit 555 determines that there is a break portion of the steel plate 10 in the rear region 604 in step S108 of FIG.
The state change of the twin-roll continuous casting machine 150 in the second operation example is the same as the state change of the twin-roll continuous casting machine 150 in the first operation example described with reference to FIGS. It is the same.

Next, with reference to FIGS. 25A and 25B, a state change of the first transporter 300A in the second operation example will be described. FIG. 25A is a diagram illustrating a first pinch roll speed graph representing a time change of the first pinch roll speed in the second operation example. FIG. 25B is a diagram illustrating a first pinch roll gap graph representing a time change of the first pinch roll gap in the first operation example.
At time 20 (sec), as shown in FIG. 25 (a), the first pinch roll speed starts to decrease and the first pinch roll speed changes from 80 (mpm) to 0 (mpm) by the process of FIG. . Moreover, as shown in FIG.25 (b), the 1st pinch roll 301A is open | released and the distance between a pair of 1st pinch roll 301A spreads to 50 (mm).

Next, with reference to FIGS. 26A and 26B, the state change of the second transporter 300B in the second operation example will be described. FIG. 26A is a diagram showing a second pinch roll speed graph showing a time change of the second pinch roll speed in the second operation example. FIG. 26B is a diagram illustrating a second pinch roll gap graph representing a time change of the second pinch roll gap in the second operation example.
At time 20 (sec), as shown in FIG. 26 (a), the second pinch roll speed starts to decrease and the second pinch roll speed is changed from 80 (mpm) to 0 (mpm) by the process of FIG. . As shown in FIG. 26B, the second pinch roll 301B is opened by the process of FIG. 18, and the distance between the pair of second pinch rolls 301B is increased to 50 (mm).

Next, with reference to FIGS. 27A, 27B, and 27C, the state change of the rolling mill 350 in the second operation example will be described. Fig.27 (a) is a figure which shows the rolling mill speed graph showing the time change of the rolling mill speed in the 2nd operation example. FIG. 27B is a view showing a rolling roll gap graph showing a change with time of the rolling roll gap in the second operation example. FIG.27 (c) is a figure which shows the rolling mill pressing force graph showing the time change of the rolling mill pressing force in the 2nd operation example.
As shown in FIG. 27 (a), at the time 20 (sec), the rolling mill speed starts to decrease and the rolling mill speed changes from 80 (mpm) to 0 (mpm) by the process of FIG. Further, as shown in FIG. 27 (b), by the process of FIG. 18, at time 20 (sec), the rolling roll 351 is opened and the distance between the pair of rolling rolls 351 is increased to 50 (mm). . Further, as shown in FIG. 27 (c), at time 20 (sec), the distance between the pair of rolling rolls 351 begins to increase and the rolling mill 350 does not roll the steel plate 10, so at time 20 (sec). When the rolling mill pressing force drops from 200 (tonf) to 0 (tonf).

Next, with reference to FIG. 28, the state change of the coiler 450 in the second operation example will be described. FIG. 28 is a diagram illustrating a coiler speed graph representing a temporal change in the coiler speed in the second operation example.
As shown in FIG. 28, by the process of FIG. 18, at the time 20 (sec), the coiler speed starts to decrease, and the coiler speed is changed from 80 (mpm) to 0 (mpm).

[Third operation example]
Next, a third operation example of the control system 1 will be described.
The third operation example is a steady casting state until time 19.5 (sec), and at time 19.5 (sec), the operation example of the control system 1 when the steel plate 10 is broken in the second intermediate region 603. It is. At time 19.5 (sec), the estimation unit 556 estimates that the steel plate 10 has broken in the region between the first transporter 300A and the rolling mill 350 in step S115 of FIG.
With reference to FIG. 29, the state change of the rolling mill 350 in the third operation example will be described. FIG. 29 is a diagram showing a rolling mill pressing force graph showing a time change of the rolling mill pressing force in the third operation example.
As shown in FIG. 29, at the time of 19.5 (sec) by the process of step S500 of FIG. 19, the pressing force of the rolling mill starts to decrease and decreases from 200 (tonf) to 1 (tonf). Will be in the state which lightly lowers the steel plate 10.

  Further, the third operation example is an operation example in which the fracture portion of the steel plate 10 reaches the rear region 604 through the rolling mill 350 at time 20 (sec). For this reason, the state of the control system 1 after time 20 (sec) is the same as the second operation example described with reference to FIGS.

In the third operation example, step S500 in FIG. 19 is executed, but step S502 in FIG. 19 is not executed. This is because processing is performed as follows.
First, at time 19.5 (sec), step S500 in FIG. 19 is executed as described above. Thereafter, in the process of FIG. 19, step S501 is executed until 1 (sec), which is an erroneous detection determination time, has elapsed and time 20.5 (sec) is reached.
On the other hand, at time 20 (sec), in step S108 in FIG. 14, the break determination unit 555 determines that there is a break in the rear region 604, which is the region between the rolling mill 350 and the coiler 450, and FIG. The casting machine stop process and the second fracture control process of FIG. 18 are executed, and then the casting and rolling control process of FIG. 14 ends.
Therefore, in the third operation example, the casting rolling control process of FIG. 14 is completed before step S501 of FIG. 19 is executed, and therefore step S501 of FIG. 19 that is a process in the casting rolling control process is not executed. .
Even when the steel plate 10 breaks in the first intermediate region 602, the control system 1 performs the same operation as in the third operation example.

[Fourth operation example]
Next, a fourth operation example of the control system 1 will be described.
The fourth operation example is an operation example of the control system 1 when the estimation unit 556 erroneously estimates that the steel plate 10 is broken in the second intermediate region 603 at time 20 (sec). In the fourth operation example, the steel plate 10 is not actually broken.
The operation of the casting and rolling equipment 100 other than the rolling mill 350 in the fourth operation example is the operation in the steady casting state.

With reference to FIG. 30, a state change of the rolling mill 350 in the fourth operation example will be described. FIG. 30 is a diagram showing a rolling mill pressing force graph showing a time change of the rolling mill pressing force in the fourth operation example.
As shown in FIG. 30, at the time 20 (sec) by the process of step S500 of FIG. 19, the pressing force of the rolling mill starts to decrease and weakens from 200 (tonf) to 1 (tonf). 10 is lightly reduced. Moreover, after 1 (sec) which is a misdetection determination time passes, as shown in FIG. 30, the state which the rolling mill 350 lightly reduces the steel plate 10 is cancelled | released, and the rolling mill pressing at the time of a steady casting state Return to 200 (tonf).
In the fourth operation example, unlike the third operation example, the steel plate 10 is not actually broken. Therefore, the break determination unit 555 does not determine that there is a break in the rear region 604 that is the region between the rolling mill 350 and the coiler 450, and the casting and rolling control process in FIG. Therefore, after the elapse of the erroneous detection determination time, step S502 in FIG. 19 is executed, and the rolling mill pressing force returns to 200 (tonf).

[effect]
As described above, the control device 500 performs control to stop the rotation of the pair of casting rolls 201 after the discharge time has elapsed when the steel plate 10 is broken in the front region 601. Therefore, even when the steel plate 10 is broken, the casting roll 201 is stopped after the hot water pool 210 is emptied, so that the molten steel 11 does not solidify in the hot water pool 210. Therefore, the work of peeling off the steel material bonded to the casting roll 201 from the casting roll 201 becomes unnecessary. For this reason, it is possible to avoid shortening the service life of the casting roll 201 due to, for example, scraping the surface dimples of the casting roll along with the work of peeling the steel material from the casting roll 201, and the twin roll continuous casting machine 150 can be protected. Furthermore, the complexity of maintenance work can be reduced. Thus, in the control system 1, when a steel plate fractures | ruptures, a twin roll type continuous casting machine can be stopped appropriately.
Further, the control device 500 determines that the steel plate 10 is broken in the front region 601 when the steel plate 10 reaches the first reference height below the casting roll gap of the twin-roll continuous casting machine 150. Therefore, the control device 500 can accurately determine the breakage of the steel plate 10.

  Moreover, the control apparatus 500 determines with the steel plate 10 having fractured | ruptured in the front area | region 601 when the state in which the steel plate 10 reached the 1st reference height continued during 1st reference time. Therefore, the risk of erroneous determination is reduced.

  Further, when it is determined that the steel plate 10 has broken in the front region 601, the control device 500 controls the stopper 162 to close the spout of the tundish 161. Therefore, when the steel plate 10 breaks in the front region 601, the injection of the molten steel 11 into the puddle 210 is stopped, and the puddle 210 can be emptied.

  Moreover, the control apparatus 500 determines with the fracture | rupture part of the steel plate 10 in the back area | region 604, when the position of the up-down direction of the raising / lowering roll 401 is below 2nd reference | standard height. Therefore, the breakage of the steel plate 10 can be accurately detected without a time lag without using a measuring instrument such as a tension detector that may be damaged by the heat of the steel plate 10. Moreover, when it determines with the control apparatus 500 having the fracture | rupture part of the steel plate 10 in the back area | region 604, the rotation of the rolling roll 351 is stopped and control which stops discharge | emission of the steel plate 10 by the rolling mill 350 is performed. In addition, the control device 500 performs control to stop the rotation of the coiler motor 455 and stop the drawing of the steel plate 10 by the coiler 450. Therefore, when there is a fracture portion of the steel plate 10 in the rear region 604, the conveyance of the steel plate 10 can be stopped quickly.

  Moreover, the control apparatus 500 determines with the fracture | rupture part of the steel plate 10 being in the back area | region 604, when the position of the up-down direction of the raising / lowering roll 401 is below 2nd reference height during 2nd reference time. Therefore, the risk of erroneous determination is reduced.

  Moreover, when it determines with the control apparatus 500 having the fracture | rupture part of the steel plate 10 in the back area | region 604, after discharge time passes, it performs control which stops rotation of a pair of casting roll 201. FIG. Therefore, since the casting roll 201 is stopped after the hot water pool 210 is emptied, the molten steel 11 does not solidify in the hot water pool 210.

  Further, when the control device 500 determines that the steel plate 10 is broken in the front region 601 or when it is determined that there is a broken portion of the steel plate 10 in the rear region 604, at least one of the rolling rolls 351 is separated from the steel plate 10. In this way, control is performed to increase the distance between the pair of rolling rolls 351. Therefore, when the conveyance of the steel plate 10 is stopped, maintenance work such as taking out the steel plate 10 from the casting and rolling equipment 100 is facilitated.

Moreover, the control device 500 is a region between the first transfer machine 300A and the rolling mill 350 based on the change amount of the current flowing through the first transfer motor 303A or the change amount of the current flowing through the second transfer motor 303B. Thus, it is estimated whether or not the steel plate 10 is broken. And when it estimates that the steel plate 10 fracture | ruptured, the control apparatus 500 weakens a rolling mill pressing force until it estimates that the steel plate 10 fracture | ruptured, but the misdetection determination time passes. Therefore, even if the steel plate 10 is actually broken, even if the broken portion of the steel plate 10 passes through the rolling roll 351 and the pair of rolling rolls 351 come into contact, the pressing force of the rolling mill is weakened. As described with reference to FIG. 2, the risk of the rolling mill 350 being damaged is reduced.
When the fracture portion of the steel plate 10 passes the rolling roll 351, immediately after the passage, the control device 500 determines that the fracture portion of the steel plate 10 is present in the rear region 604 based on the looper height 41, and the rolling roll. 351 is opened. Therefore, contact between the pair of rolling rolls 351 can be avoided, or even if the pair of rolling rolls 351 come into contact, the contact time can be shortened. Therefore, the possibility that the rolling mill 350 is damaged is reduced.

Further, the control device 500 performs control to return the rolling mill pressing force of the rolling mill 350 after the erroneous detection determination time has elapsed. Therefore, when the control apparatus 500 estimates that the steel plate 10 is broken by mistake, the control system 1 can continue the steady casting state, and can continue casting and rolling of the steel plate 10.
Further, the control device 500 weakens the rolling mill pressing force until the erroneous detection determination time elapses, but does not open the rolling roll 351. Therefore, the state in which the rolling roll 351 contacts the steel plate 10 is continued. Therefore, when the control device 500 estimates that the steel plate 10 has been broken by mistake, even if the rolling mill pressing force of the rolling mill 350 is returned, the rolling roll 351 once separated from the steel plate 10 contacts the steel plate 10 again, and the steel plate 10 It can be avoided that the movement of the steel plate 10 is disturbed and the heated steel plate 10 is brought into an unstable state such as contacting each device.

  Further, the control device 500 determines that the steel plate 10 has broken in the front region 601, and when determining that the broken portion of the steel plate 10 has passed through the first transfer device 300A, the control device 500 stops the transfer by the first transfer device 300A. I do. In addition, the controller 500 determines that the fracture portion of the steel plate 10 has passed through the first transporter 300A, and after the hunting convergence time has elapsed since the determination that the fracture portion of the steel plate 10 has passed through the first transporter 300A, When the determination is made, control is performed to stop the conveyance by the second conveyance device 300B. Here, until the hunting convergence time elapses, the movement of the steel plate 10 is unstable, and the control device 500 may erroneously determine that the fracture portion of the steel plate 10 has passed through the second transporter 300B. . However, the control device 500 performs control to stop the conveyance by the second conveyance device 300B based on the passage determination of the fracture portion after the hunting convergence time has elapsed. Therefore, the possibility that the control device 500 erroneously determines that the fracture portion of the steel plate 10 has passed through the second transporter 300B is reduced.

  In addition, when the control device 500 determines that the steel plate 10 has broken in the front region 601 and determines that the broken portion has passed through the second transporter 300B, the control device 500 stops the rotation of the rolling roll 351 and Control for stopping the discharge is performed, and further, control for stopping the retraction of the steel plate 10 by stopping the winding of the steel plate 10 by the coiler 450 is performed. Therefore, the control device 500 does not stop the rotation of the rolling roll 351 and does not stop the winding of the steel plate 10 by the coiler 450 until it is determined that the fracture portion of the steel plate 10 has passed through the second transporter 300B. . Therefore, even if the steel plate 10 breaks, the coiler 450 can sufficiently wind the steel plate 10.

  Moreover, when it determines with the steel plate 10 having fractured | ruptured in the front area | region 601, the control apparatus 500 makes a casting roll speed, a pinch roll speed, a rolling mill speed, and a coiler speed slow. Therefore, the possibility that the broken steel plate 10 will move unstable is reduced, and the safety of the casting and rolling equipment 100 is ensured.

[Other Embodiments]
The casting and rolling equipment 100 includes one rolling mill 350, but a plurality of rolling mills 350 may be provided. For example, a plurality of the rolling mills may be disposed between the second transporter 300B and the looper 400 in the transport path of the steel plate 10. At this time, the 2nd conveyance machine 300B conveys the steel plate 10 to the rolling mill 350 nearest to the twin roll type continuous casting machine 150 in the conveyance path | route of the steel plate 10. FIG. The rolling mill 350 closest to the looper 400 in the conveyance path of the steel plate 10 discharges the steel plate 10 to the looper 400. Thereby, using the some rolling mill 350, compared with the case where the rolling mill 350 is one, the precision of rolling can be improved or it can roll so that the steel plate 10 may become thinner.
Similarly to steps S114 and S115 in FIG. 14, the control device 500 estimates whether or not the steel plate 10 is broken in the region between the adjacent rolling mills 350 based on the amount of change in the current flowing through the rolling motor 354. To do. When it is estimated that the breakage of the steel sheet 10 has occurred in the region between the adjacent rolling mills 350, the control device 500 executes the fracture estimation time control process of FIG. The rolling mill pressing force of the rolling mill 350 is weakened by the control process at the time of fracture estimation. Therefore, even if the steel plate 10 is actually broken, even if the broken portion of the steel plate 10 passes through the rolling roll 351 and the pair of rolling rolls 351 come into contact, the pressing force of the rolling mill is weakened. As described with reference to FIG. 2, the risk of the rolling mill 350 being damaged is reduced.

The casting and rolling equipment 100 includes two conveyors 300, but the conveyor 300 may be one or three or more.
As mentioned above, although this invention was demonstrated with embodiment, the said embodiment was only what showed the example of actualization in implementing this invention, and the technical scope of this invention is interpreted limitedly by these. It must not be. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.

  DESCRIPTION OF SYMBOLS 1 Control system, 100 Casting and rolling equipment, 150 Twin roll type continuous casting machine, 300 Conveying machine, 350 Rolling mill, 400 Looper, 450 Coiler, 500 Control device

Claims (9)

A looper that is disposed in a conveying path of the steel plate, and includes a lifting roll that presses the steel plate from above to generate tension, and a counter balance weight that adjusts a force with which the lifting roll presses the steel plate,
A discharge device disposed in a conveying path of the steel plate, and discharging the steel plate to the looper;
A retraction device for drawing in the steel sheet discharged from the looper;
When the vertical position of the elevating roll is equal to or lower than the roll reference height, it is determined that there is a broken portion that is an end portion of the steel plate that is broken in a determination region that is a region between the discharge device and the drawing device A determination system comprising: a break determination unit;   The break determination means determines that the break portion is present in the determination region when a state in which the vertical position of the lifting roll is below the roll reference height continues for a preset reference time. The determination system according to claim 1, wherein: First control means for performing control to stop the discharge of the steel sheet by the discharge device when it is determined by the break determination means that the break portion is in the determination area;
2. A second control unit that performs control to stop pulling of the steel sheet by the pull-in device when it is determined by the break determination unit that the fractured portion is in the determination region. 3. The determination system according to 1 or 2. The discharge device is a rolling mill that rolls the steel sheet with a pair of rolling rolls so as to satisfy a preset rolling target,
The first control means stops the rotation of the rolling roll to stop the discharge of the steel sheet when the break determination means determines that the break portion is in the determination area, and at least one of the The determination system according to claim 3, wherein control is performed to increase a distance between the pair of rolling rolls so that the rolling rolls are separated from the steel plate.   The determination system according to claim 4, wherein a plurality of the rolling mills are arranged on a conveyance path of the steel plate. The pull-in device is a coiler that winds up the steel plate discharged from the looper,
The second control means performs control to stop the winding of the steel sheet by stopping the winding of the steel sheet by the coiler when it is determined by the fracture determination means that the rupture portion is present in the determination region. The determination system according to any one of claims 3 to 5, wherein: A looper that is disposed in a conveying path of the steel plate, and includes a lifting roll that presses the steel plate from above to generate tension, and a counter balance weight that adjusts a force with which the lifting roll presses the steel plate,
A discharge device disposed in a conveying path of the steel plate, and discharging the steel plate to the looper;
A determination device used in a facility comprising a drawing-in device that draws in the steel sheet discharged from the looper,
When the vertical position of the elevating roll is equal to or lower than the roll reference height, it is determined that there is a broken portion that is an end portion of the steel plate that is broken in a determination region that is a region between the discharge device and the drawing device. A determination apparatus comprising a break determination means. A looper that is disposed in a conveying path of the steel plate, and includes a lifting roll that presses the steel plate from above to generate tension, and a counter balance weight that adjusts a force with which the lifting roll presses the steel plate,
A discharge device disposed in a conveying path of the steel plate, and discharging the steel plate to the looper;
A method of controlling a determination device used in equipment comprising a drawing-in device for drawing in the steel sheet discharged from the looper,
When the vertical position of the elevating roll is equal to or lower than the roll reference height, it is determined that there is a broken portion that is an end portion of the steel plate that is broken in a determination region that is a region between the discharge device and the drawing device. A control method for a determination apparatus, comprising a break determination step.   A program for causing a computer to function as the determination device according to claim 7.

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