JP2017221966A - Continuous casting apparatus and continuous casting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuous casting apparatus and a continuous casting method by which a position can be tracked more reliably.SOLUTION: A continuous casting apparatus 1 comprises: plural pinch rolls 4 which are arranged along a transportation route R1 of a slab 21 and transport the slab 21; plural sensors 5 which respectively output information concerning at least rotational speeds of the plural pinch rolls 4; and a control unit 100 which is so configured as to execute such an operation that a position of a transportation object T including the slab 21 is derived by use of any one of the plural sensors 5 and such an operation that the sensor, which is used for derivation of the position, among the plural sensors 5 is changed from an upstream side to a downstream side of the transportation route R1 according to movement of the transportation object T.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a continuous casting apparatus and a continuous casting method.

  Patent Document 1 discloses a continuous casting apparatus including a measuring roll and a pinch roll. The measuring roll starts to rotate when it comes into contact with the slab. The continuous casting apparatus measures the position of the cast piece based on the rotation speed of the measuring roll and the position of the measuring roll that is known information, and drives the pinch roll based on the measured position information. Transport the piece.

Japanese Patent Publication No. 6-77791

  An object of this indication is to provide the continuous casting apparatus and continuous casting method which can track the position of slab more reliably.

  A continuous casting apparatus according to one aspect of the present disclosure includes a plurality of pinch rolls arranged along a slab conveying path, each of which outputs a plurality of pinch rolls that convey the slab and at least rotational speed information of the plurality of pinch rolls. Deriving the position of a conveyance object including a slab using one sensor and a plurality of first sensors, and moving the conveyance object to be used for deriving the position among the plurality of first sensors And a control device configured to execute switching from the upstream side to the downstream side of the transport path according to

  A continuous casting apparatus according to one aspect of the present disclosure includes a plurality of pinch rolls arranged along a slab conveying path, each of which outputs a plurality of pinch rolls that convey the slab and at least rotational speed information of the plurality of pinch rolls. A first conveyance object including at least one sensor and at least a first slab, and a second conveyance object following the first conveyance object and including at least a second slab at the same time, And a control device that controls the plurality of pinch rolls so that the distance from the second transport object is 5 times or less the minimum value of the distance between adjacent pinch rolls along the transport path.

  The continuous casting method according to one aspect of the present disclosure is any one of a plurality of first sensors that are arranged along a slab conveying path and each output information on at least rotational speeds of a plurality of pinch rolls that convey the slab. And deriving the position of the conveyance object including the slab from among the plurality of first sensors from the upstream side to the downstream side of the conveyance path according to the conveyance of the conveyance object Including.

  According to the present disclosure, the position of the slab can be more reliably tracked.

It is a schematic diagram which shows the structure of a continuous casting apparatus. It is a block diagram which illustrates the hardware constitutions of a control apparatus. It is a flowchart which shows the execution procedure of casting control. It is a flowchart which shows the casting control procedure with respect to one slab. It is a flowchart which shows the casting control procedure with respect to one slab. It is a flowchart which shows the insertion procedure of a dummy bar. It is a flowchart which shows the drive control procedure of a roll. It is a flowchart which shows the drive control procedure of a roll. It is a flowchart which shows the drive control procedure of a roll. It is a flowchart which shows the drive control procedure of a roll. It is a flowchart which shows the separation / conveyance procedure of a dummy bar. It is a flowchart which shows the adjustment procedure of a moving speed. It is a schematic diagram which shows the state which has inserted the dummy bar into the casting_mold | template. It is a schematic diagram which shows the state which is performing the roll drive control in insertion mode. It is a schematic diagram which shows the state which is performing the roll drive control in casting mode. It is a schematic diagram which shows the state which is performing roll drive control in drawing mode. It is a schematic diagram which shows the state which switches a length measurement roll to active. It is a schematic diagram which shows the state which is performing simultaneously 1st casting control and 2nd casting control.

  Hereinafter, embodiments will be described in detail with reference to the drawings. In the description, the same elements or elements having the same functions are denoted by the same reference numerals, and redundant description is omitted.

1. Continuous casting apparatus 1.1 Overall configuration The continuous casting apparatus 1 is an apparatus that forms a strip-shaped or linear cast piece by drawing molten metal (for example, molten steel) from a mold. As shown in FIG. 1, the continuous casting apparatus 1 includes at least a plurality of pinch rolls 4, a plurality of sensors 5 (first sensors), and a control device 100. The plurality of pinch rolls 4 are arranged along the slab transport path R1 and transport the slab. The plurality of sensors 5 respectively output information related to at least the rotational speed of the plurality of pinch rolls 4. FIG. 1 schematically shows the continuous casting apparatus 1, and the number and arrangement of the pinch rolls 4 are not limited to those shown in the drawing. Hereinafter, the specific structure of the continuous casting apparatus 1 is illustrated.

  As shown in FIG. 1, the continuous casting apparatus 1 includes a molten steel supply unit 2, a mold 3, and a plurality of conveyance units U <b> 1. The molten steel supply unit 2 supplies molten steel for casting to the mold 3. The molten steel supply part 2 is comprised by a ladle, a tundish, etc., for example. The mold 3 forms the molten steel supplied by the molten steel supply unit 2 into a predetermined shape and sends it out. The plurality of transport units U1 are arranged along the transport path R1 and transport the transport target T.

  As will be described later, the conveyance object T before the start of slab formation includes the dummy bar 22, and the conveyance object T at the time of starting the slab formation includes the dummy bar 22 and the slab 21 that are connected to each other. The object T to be transported after the separation includes the slab 21 separated from the dummy bar 22. The conveyance path R1 extends, for example, downward from the mold 3, is curved in the middle, and further extends in the horizontal direction. In the following description, “upstream” means the mold 3 side in the transport path R1, and “downstream” means the opposite side of the mold 3 in the transport path R1.

  The transport unit U1 includes two pinch rolls 4, two sensors 5, a switching drive unit 6, and a rotation drive unit 7. The two pinch rolls 4 are disposed so as to sandwich the transport path R1 in a direction intersecting (for example, orthogonal to) the transport path R1.

  The two sensors 5 each output information on at least the rotational speed of the two pinch rolls 4. For example, the sensor 5 is a pulse generator, and outputs a pulsed electric signal at a frequency correlated (for example, proportional to) the rotational speed of the pinch roll 4.

  The switching drive unit 6 moves the pinch roll 4 on one side (for example, the side facing upward on the downstream side of the conveyance path R1) of the conveyance target T using, for example, a hydraulic cylinder as a power source, and the pinch roll 4 is conveyed. A state in which the object is pressed against the object T (hereinafter referred to as “active state”) and a state in which the pinch roll 4 is separated from the conveyance object T (hereinafter referred to as “inactive state”) are switched.

  The rotation drive unit 7 rotates the pinch roll 4 using, for example, an electric motor as a power source. The rotation drive unit 7 may be configured to rotate both the pinch rolls 4, or may be configured to rotate only one of the pinch rolls 4.

  The conveyance target T is conveyed by the pinch roll 4 in the active state (hereinafter referred to as “active pinch roll 4”). That is, the active pinch roll 4 corresponds to the pinch roll 4 that is transporting the transport target T.

  The continuous casting apparatus 1 may further include a length measuring roll 8 and a sensor 9 (second sensor), and may further include a switching drive unit 10. The length measuring roll 8 is provided on one side (for example, the upper side) of the conveyance target T, and rotates in accordance with the movement of the conveyance target T when in contact with the conveyance target T. The length measuring roll 8 in contact with the transport target T rotates so that the peripheral speed matches the moving speed of the transport target T due to the frictional force with the transport target T. Here, “match” means a substantial match, and includes a state where a difference in error level exists. The same applies to the following.

  The length measuring roll 8 is disposed downstream of at least two transport units U1 in the direction along the transport path R1. As an example, the length measuring roll 8 is disposed further downstream than the transport unit U1 located on the most downstream side among all the transport units U1.

  The sensor 9 outputs information on at least the rotational speed of the length measuring roll 8. For example, the sensor 9 is a pulse generator, and outputs a pulsed electric signal at a frequency correlated (for example, proportional) to the rotation speed of the length measuring roll 8.

  The switching drive unit 10 moves the length measuring roll 8 using, for example, a hydraulic cylinder or the like as a power source, the state in which the length measuring roll 8 is pressed against the conveyance target T (hereinafter referred to as “active state”), and length measurement. The state in which the roll 8 is separated from the conveyance target T (hereinafter referred to as “inactive state”) is switched.

  The continuous casting apparatus 1 may further include a dummy bar transport device 11. The dummy bar conveyance device 11 separates the dummy bar 22 that has reached a predetermined separation position from the cast piece 21, conveys the dummy bar 22 to the insertion position into the mold 3, and inserts it into the mold 3. For example, the dummy bar transport device 11 includes a winch 12, a dummy bager 13, and a conveyor 14.

  The winch 12 pulls up the dummy bar 22 that has reached a predetermined separation position and separates it from the cast piece 21. The separation position is set further downstream than the transport unit U1 located on the most downstream side of all the transport units U1. When the continuous casting apparatus 1 includes the length measuring roll 8, the separation position may be set between the transport unit U 1 and the length measuring roll 8 on the most downstream side.

  The dummy backer 13 moves between a position for receiving the dummy bar 22 from the winch 12 and a position for inserting the dummy bar 22 into the mold 3. The position for inserting the dummy bar 22 into the mold 3 is, for example, above the mold 3.

  The conveyor 14 is provided on the dummy bunker 13, and pulls up the dummy bar 22 onto the dummy baker 13 and sends the dummy bar 22 to the mold 3. The conveyor 14 may have a sensor 15 (third sensor). When the sensor 15 sends the dummy bar 22 from the conveyor 14, the sensor 15 outputs information related to the sending speed. For example, the sensor 15 is a pulse generator, and outputs a pulsed electric signal at a frequency correlated (for example, proportional) to the transmission speed of the dummy bar 22.

  The continuous casting apparatus 1 may further include a conveyance table 16 and a cutter 17. The conveyance table 16 acquires the slab 21 from the conveyance unit U1 located on the most downstream side among all the conveyance units U1, further conveys it, and arranges it at a cutting position. The cutter 17 cuts the slab 21 positioned by the transport table 16. Specific examples of the cutter 17 include a fusing torch cutter.

1.2 Controller (controller)
Next, the configuration of the control device 100 will be described in detail. The control device 100 derives the position of the conveyance target T including the slab 21 using any one of the plurality of sensors 5 and uses the sensor used for derivation of the position among the plurality of sensors 5 as the conveyance target T. And switching from the upstream side to the downstream side of the transport path R1 in accordance with the movement of.

  The control device 100 may be configured to control the pinch roll 4 based on the derived position of the transport target T. More specifically, the control device 100 may be configured to switch the pinch roll 4 to an active state or an inactive state based on the derived position of the transport target T. Further, the control device 100 may be configured to control the rotational speed of the active pinch roll 4 based on the output of the sensor 5.

  For example, the control device 100 includes a control command generation unit 111, a dummy bar conveyance control unit 112, a molten steel supply control unit 113, a tracking control unit 114, a pinch as a functional configuration (hereinafter referred to as “functional module”). A roll control unit 115 and a cutting control unit 116 are included.

  The control command generation unit 111 acquires a command input from the outside, and executes a process according to the command input, the dummy bar conveyance control unit 112, the molten steel supply control unit 113, the pinch roll control unit 115, and the cutting control unit. A control command for 116 is generated. The command input from the outside may be input to the operation panel by an operator, or may be input from a host control device.

  The dummy bar transport control unit 112 controls the dummy bar transport device 11 based on a control command from the control command generation unit 111. The molten steel supply control unit 113 controls the molten steel supply unit 2 based on the control command from the control command generation unit 111.

  The tracking control unit 114 derives the position of the conveyance target T using any one of the plurality of sensors 5 and uses the sensor used for derivation of the position among the plurality of sensors 5 according to the movement of the conveyance target T. And switching from the upstream side to the downstream side of the transport path R1. The tracking control unit 114 may further execute deriving the position of the slab 21 using the sensor 9.

  The pinch roll control unit 115 controls the plurality of transport units U1 so as to transport the transport target T at a moving speed (hereinafter referred to as “target moving speed”) according to a command from the control command generating unit 111. . In this control, the pinch roll control unit 115 controls the switching drive unit 6 so as to switch the pinch roll 4 to an active state or an inactive state based on the position of the conveyance target T derived by the tracking control unit 114. The pinch roll control unit 115 is driven to rotate based on the output of the sensor 5 so as to rotate the active pinch roll 4 at a rotation speed corresponding to the target movement speed (a rotation speed at which the peripheral speed matches the target movement speed). The unit 7 is controlled.

  The cutting control unit 116 controls the transport table 16 and the cutter 17 based on the control command from the control command generating unit 111.

  The control device 100 is configured by one or a plurality of control computers. For example, the control device 100 includes the circuit 120 illustrated in FIG. The circuit 120 includes one or more processors 121, a memory 122, a storage 123, an input / output port 124, and a driver 125.

  The input / output port 124 performs input / output of electrical signals between the molten steel supply unit 2, the sensors 5, 9, 15, the switching drive unit 6, and the switching drive unit 10. Further, the input / output port 124 inputs and outputs electrical signals to and from the plurality of drivers 125. The plurality of drivers 125 are inverters, for example, and output drive power corresponding to a command signal from the input / output port 124 to the rotation drive unit 7, winch 12, dummy backer 13, conveyor 14, transport table 16, and cutter 17.

  The storage 123 includes a computer-readable recording medium such as a nonvolatile semiconductor memory. The recording medium records a program for causing the continuous casting apparatus 1 to execute a casting procedure described later.

  The memory 122 temporarily records the program loaded from the storage 123 and the calculation result by the processor 121. The processor 121 configures each functional module described above by executing the program in cooperation with the memory 122.

  Note that the hardware configuration of the control device 100 is not necessarily limited to the configuration of each functional module by a program. For example, each functional module of the control apparatus 100 may be configured to include a dedicated logic circuit or an ASIC (Application Specific Integrated Circuit) in which the logic circuit is integrated.

2. Casting control procedure The continuous casting method according to the present embodiment is one of a plurality of first sensors that are arranged along a slab conveying path and each output information on at least rotational speeds of a plurality of pinch rolls that convey the slab. The position of the conveyance object including the slab is derived using the slab, and the sensor used for deriving the position among the plurality of first sensors is determined from the upstream side to the downstream side of the conveyance path according to the conveyance of the conveyance object. Switching to. Hereinafter, a casting control procedure executed by the control device 100 will be described as an example of the continuous casting method.

  As shown in FIG. 3, the control device 100 first executes steps S01 and S02 in order. In step S01, the control command generator 111 waits for the preparation for inserting the dummy bar 22 to be completed. The state where the preparation for inserting the dummy bar 22 is completed means a state where the dummy bar 22 can be sent from the conveyor 14 to the mold 3. In step S02, the control command generator 111 waits for input of an insertion command.

  When the instruction to insert dummy bar 22 is input, control device 100 executes step S03. In step S03, the control command generator 111 starts outputting the control command so as to start the first casting control. The specific contents of the first casting control executed thereafter will be described later.

  Next, the control apparatus 100 performs step S04. In step S04, the control command generator 111 confirms whether or not the dummy bar 22 is ready for reinsertion. The state in which the preparation for reinsertion of the dummy bar 22 is completed means a state in which the dummy bar 22 cut off from the preceding slab 21 can be sent from the conveyor 14 to the mold 3. If it is determined in step S04 that preparation for reinsertion of the dummy bar 22 has not been completed, the control device 100 advances the process to step S08 (described later).

  If it is determined in step S04 that the dummy bar 22 is ready for reinsertion, the control device 100 executes step S05. In step S05, the control command generation unit 111 checks whether or not a reinsertion command has been input. If it is determined in step S05 that no reinsertion command has been input, control device 100 advances the process to step S08 (described later).

  If it is determined in step S05 that a reinsertion command has been input, control device 100 executes steps S06 and S07 in order. In step S06, the control command generator 111 starts outputting the control command so as to start the second casting control. The specific content of the second casting control is the same as that of the first casting control. In step S07, the control command generator 111 starts outputting the control command so as to start adjusting the moving speed of the transport target T. The movement speed adjustment process executed thereafter will be described later.

  Next, the control apparatus 100 performs step S08. In step S08, the control command generation unit 111 confirms whether all the casting controls that have been executed have been completed. If it is determined in step S08 that the casting control being executed remains, the control device 100 returns the process to step S04. Thereafter, the control device 100 repeats steps S04 to S08, whereby continuous casting is repeated. If it is determined in step S08 that all casting controls that have been executed have been completed, the control device 100 ends the process. Hereinafter, the casting control procedure started in steps S03 and S06 and the moving speed adjustment procedure started in step S07 will be described in detail.

2.1 Casting Control Procedure (1) Overview As shown in FIG. 4, the control device 100 first executes step S11. In step S <b> 11, the control command generation unit 111 generates a control command for carrying the dummy bar 22 into the mold 3 and outputs it to the dummy bar conveyance control unit 112 and the pinch roll control unit 115. In response to this, the dummy bar conveyance control unit 112 and the pinch roll control unit 115 respectively control the conveyor 14 and the switching drive unit 6 so as to carry the dummy bar 22 into the mold 3. Specific processing contents will be described later.

  Next, the control apparatus 100 performs step S12. In step S <b> 12, the control command generation unit 111 generates a control command for starting drive control of the pinch roll 4 in the insertion mode, and outputs this to the pinch roll control unit 115. In response to this, the pinch roll control unit 115 starts driving control of the pinch roll 4 in the insertion mode. The specific processing contents of the drive control of the pinch roll 4 that will be executed thereafter will be described later.

  Next, the control apparatus 100 performs step S13. In step S13, the control command generator 111 waits for the dummy bar 22 to reach the casting start position. The casting start position is, for example, a position at which the head 22b (upstream end portion) of the dummy bar 22 reaches the molten metal surface target position P0. When the dummy bar 22 reaches the casting start position, the control device 100 executes step S14. In step S <b> 14, the control command generation unit 111 generates a control command for stopping the drive control of the pinch roll 4, and outputs this to the pinch roll control unit 115. In response to this, the pinch roll control unit 115 stops the drive control of the pinch roll 4 in the insertion mode. Thus, the insertion of the dummy bar 22 is completed.

  Next, the control apparatus 100 performs step S15. In step S15, the control command generator 111 waits for an input of a casting start command. When a casting start command is input, control device 100 executes step S16. In step S <b> 16, the control command generation unit 111 generates a control command for starting the supply of molten steel, and outputs this to the molten steel supply control unit 113. In response to this, the molten steel supply control unit 113 controls the molten steel supply unit 2 to start supplying molten steel to the mold 3.

  Next, the control apparatus 100 performs step S17. In step S <b> 17, the control command generator 111 generates a control command for starting drive control of the pinch roll 4 in the casting mode, and outputs this to the pinch roll controller 115. In response to this, the pinch roll control unit 115 starts driving control of the pinch roll 4 in the casting mode. The specific processing contents of the drive control of the pinch roll 4 that will be executed thereafter will be described later.

  As shown in FIG. 5, the control device 100 next executes step S18. In step S <b> 18, the control command generator 111 confirms whether or not the casting stop command is input by the control device 100. If it is determined in step S18 that no casting stop command has been input, the control device 100 advances the process to step S23 (described later).

  If it is determined in step S18 that a casting stop command has been input, the control device 100 executes step S19. In step S <b> 19, the control command generation unit 111 generates a control command for stopping the supply of molten steel, and outputs this to the molten steel supply control unit 113. In response to this, the molten steel supply control unit 113 controls the molten steel supply unit 2 so as to stop the supply of molten steel to the mold 3.

  Next, the control apparatus 100 performs step S20. In step S <b> 20, the control command generation unit 111 generates a control command for stopping the drive control of the pinch roll 4, and outputs this to the pinch roll control unit 115. In response to this, the pinch roll control unit 115 stops the drive control of the pinch roll 4 in the casting mode.

  Next, the control apparatus 100 performs step S21. In step S21, the control command generation unit 111 waits for an input of a drawing start command. When the drawing start command is input, the control device 100 executes Step S22. In step S <b> 22, the control command generation unit 111 generates a control command for starting drive control of the pinch roll 4 in the drawing mode, and outputs this to the pinch roll control unit 115. In response to this, the pinch roll control unit 115 starts driving control of the pinch roll 4 in the drawing mode. The specific processing contents of the drive control of the pinch roll 4 that will be executed thereafter will be described later.

  Next, the control apparatus 100 performs step S23. In step S <b> 23, the control command generation unit 111 confirms whether or not the process of separating the dummy bar 22 from the slab 21 (hereinafter referred to as “separation process”) has been completed.

  If it is determined in step S23 that the separation process has not been completed, the control device 100 executes step S24. In step S24, the control command generation unit 111 confirms whether or not the separation process is being executed. If it is determined in step S24 that the separation process is being executed, the control device 100 advances the process to step S31 (described later).

  If it is determined in step S24 that the separation process is not being executed, the control device 100 executes step S25. In step S25, the control command generator 111 checks whether the tail 22a of the dummy bar 22 has reached the predetermined separation position (hereinafter referred to as “separation position”). If it is determined in step S25 that the tail 22a has not reached the separation position, the control device 100 advances the process to step S31 (described later).

  If it is determined in step S25 that the tail 22a of the dummy bar 22 has reached the separation position, the control device 100 executes step S26. In step S <b> 26, the control command generator 111 generates a command signal for starting the separation process, and outputs this to the dummy bar transport controller 112. In response to this, the dummy bar conveyance control unit 112 starts a process of separating the dummy bar 22 from the slab 21 and conveying the dummy bar 22 to a position for reinsertion into the mold 3 (hereinafter referred to as “separation / conveying process”). Thus, the dummy bar transport device 11 is controlled. Specific processing contents will be described later.

  If it is determined in step S23 that the separation process has been completed, the control device 100 executes step S27. In step S <b> 27, the control command generation unit 111 confirms whether or not the process of cutting the slab 21 into a desired length (hereinafter referred to as “cutting process”) has been completed.

  If it is determined in step S27 that the cutting process has not been completed, the control device 100 executes step S28. In step S28, the control command generation unit 111 checks whether or not the cutting process is being executed. If it is determined in step S28 that the cutting process is being executed, the control device 100 advances the process to step S31 (described later).

  If it is determined in step S28 that the cutting process is not being executed, the control device 100 executes step S29. In step S29, the control command generator 111 checks whether or not the tip 21a of the slab 21 has reached the cutting start position. If it is determined in step S29 that the tip 21a of the slab 21 has not reached the cutting start position, the control device 100 advances the process to step S31 (described later).

  When it determines with the front-end | tip 21a of the slab 21 having reached | attained the cutting start position in step S29, the control apparatus 100 performs step S30. In step S <b> 30, the control command generation unit 111 generates a command signal for starting the cutting process, and outputs this to the cutting control unit 116. In response to this, the cutting control unit 116 controls the transport table 16 and the cutter 17 so as to start a process of cutting the slab 21 with a desired length.

  Next, the control apparatus 100 performs step S31. In step S31, the control command generator 111 confirms whether the drive control of the pinch roll 4 is executed in the casting mode or the drawing mode. In Step S31, when it is determined that the drive control of the pinch roll 4 is being executed in the casting mode, the control device 100 returns the process to Step S18. If it is determined in step S31 that the drive control of the pinch roll 4 is being executed in the pull-out mode, the control device 100 returns the process to step S23. Thereafter, the drive control of the pinch roll 4 in the casting mode or the drawing mode is continued until it is determined in step S23 that the separation process has been completed, and further in step S27, it is determined that the cutting process has been completed.

  If it is determined in step S27 that the cutting process has been completed, the control device 100 completes the casting control.

(2) Dummy bar carry-in procedure Subsequently, the specific processing content of step S11 will be described. As shown in FIG. 6, the control device 100 first executes step S41. In step S <b> 41, the dummy bar conveyance control unit 112 controls the conveyor 14 so as to start carrying the dummy bar 22 into the mold 3.

  Next, the control apparatus 100 performs step S42. In step S <b> 42, the dummy bar conveyance control unit 112 waits for the tail 22 a (downstream end) of the dummy bar 22 to pass the predetermined pinch roll 4. That is, the dummy bar conveyance control unit 112 waits for the tail 22a to pass between the two pinch rolls 4 in the predetermined conveyance unit U1. The predetermined pinch roll 4 and the predetermined transport unit U1 may be the pinch roll 4 and the transport unit U1 positioned at the uppermost stream in the transport path R1, or several (for example, two to three) pieces from the uppermost stream. The pinch roll 4 and the conveyance unit U1 may be sufficient. Here, “passing” means passing through a position corresponding to the center position of the pinch roll 4 in the direction along the transport path R1.

  The dummy bar conveyance control unit 112 derives the current position of the tail 22 a based on the output of the sensor 15 and waits for the current position to pass the predetermined pinch roll 4. For example, the dummy bar conveyance control unit 112 obtains the transmission length L1 of the dummy bar 22 from the conveyor 14 based on the output of the sensor 15, and adds this to the position P1 of the tail 22a immediately before the execution of step S41, whereby the current of the tail 22a. A position P2 is derived (see FIG. 13A).

  The “position” here may be expressed in any way as long as the position on the transport route R1 can be uniquely identified. For example, the “position” may be represented by one-dimensional coordinates with a predetermined reference point as an origin and a downstream side of the transport route R1 as a positive direction. The reference location may be any location as long as it is located on the transport path R1. For example, the reference location may be the molten steel surface target position P 0 in the mold 3.

  If it is determined in step S42 that the tail 22a has passed the predetermined pinch roll 4, the control device 100 executes step S43. In step S43, the dummy bar conveyance control unit 112 controls the dummy bar conveyance device 11 so as to stop the delivery of the dummy bar 22 from the conveyor 14.

  Next, the control apparatus 100 performs step S44. In step S44, the pinch roll control unit 115 controls the switching drive units 6 respectively corresponding to the pinch rolls 4 so as to activate all the pinch rolls 4 located on the upstream side of the tail 22a of the dummy bar 22. (Refer to FIG. 13B).

  Next, the control apparatus 100 performs step S45. In step S45, the dummy bar transport control unit 112 controls the dummy bar transport device 11 so as to move the dummy backer 13 toward the winch 12 and separate the conveyor 14 from the dummy bar 22 (see FIG. 13C). This completes the loading of the dummy bar 22.

(3) Roll Drive Control Procedure Next, specific processing contents of the drive control of the pinch roll 4 started in steps S12, S17, and S22 will be described. As shown in FIG. 7, the control apparatus 100 first executes step S51. In step S51, the pinch roll control unit 115 checks whether or not the drive control mode of the pinch roll 4 (hereinafter referred to as “control mode”) is the insertion mode.

  If it is determined in step S51 that the control mode is the insertion mode, the control device 100 executes step S52 as shown in FIG. In step S <b> 52, the tracking control unit 114 starts to derive the position of the leading end t <b> 1 of the conveyance target T (hereinafter referred to as “first position”) using the sensor 5. The tracking control unit 114 derives the position of the conveyance target T using the sensor 5 with reference to the first position of the conveyance target T immediately before execution of step S52 (the position derived using the sensor 15). . For example, the tracking control unit 114 obtains the movement distance L2 of the conveyance target T by the pinch roll 4 based on the output of the sensor 5, and uses this to determine the position P3 (ie, the front end t1 of the conveyance target T immediately before the execution of Step S52). The current position P4 of the tip end t1 is derived by adding to the position of the tail 22a (see FIG. 13C).

  Next, the control apparatus 100 performs step S53. In step S <b> 53, the pinch roll control unit 115 controls the rotation drive units 7 corresponding to these pinch rolls 4 so as to start driving all the active pinch rolls 4.

  After execution of step S53, the control device 100 uses a sensor used for deriving the first position of the transport target T among the plurality of sensors 5 from the upstream side to the downstream side of the transport path R1 according to the transport of the transport target T. Switch to. When an abnormality occurs in the derivation result of the first position of the conveyance target T using the sensor 5, the control device 100 applies the sensor used for derivation of the position to the pinch roll 4 that is conveying the conveyance target T. Switching to another corresponding sensor 5 may be further executed.

  For example, the control device 100 first executes step S54. In step S54, the pinch roll 4 positioned on the downstream side with respect to the active pinch roll 4 (hereinafter referred to as “next pinch roll 4”) is moved to the front end t1 (that is, the tail 22a) of the conveyance target T. ) Has passed or not, the pinch roll control unit 115 determines. If it is determined in step S54 that the tip end t1 has not passed the next pinch roll 4, the control device 100 advances the process to step S57 (described later).

  When it is determined in step S54 that the tip end t1 has passed the next pinch roll 4 (see FIG. 14), the control device 100 executes steps S55 and S56 in order. In step S55, the rotation drive unit 7 corresponding to the pinch roll 4 is controlled so as to start the rotation drive of the next pinch roll 4, and the pinch roll 4 is set to be in an active state. The switching drive unit 6 corresponding to is controlled.

  In step S56, the tracking control unit 114 switches the sensor 5 used for derivation of the first position of the conveyance target T among the plurality of sensors 5 to the sensor 5 corresponding to the pinch roll 4 that is newly in the active state. Thereafter, the tracking control unit 114 uses the first position of the conveyance target T derived using the sensor 5 before switching in Step S56 as a reference, and the tracking control unit 114 sets the conveyance target T using the sensor 5 after switching in Step S56. Derivation of the first position is performed. For example, the tracking control unit 114 obtains the movement distance L3 of the conveyance target T by the pinch roll 4 based on the output of the sensor 5 after switching, and adds it to the position P5 of the tip t1 derived using the sensor 5 before switching. As a result, the current position P6 of the tip end portion t1 is derived (see FIG. 14).

  Next, the control apparatus 100 performs step S57. In step S57, the tracking control unit 114 determines whether or not there is an abnormality in the position derivation result using the sensor 5. In step S57, when it is determined that there is no abnormality in the derivation result of the first position of the conveyance target T using the sensor 5, the control device 100 advances the process to step S59 (described later).

  There is no limitation on the method for determining whether or not there is an abnormality in the position derivation result. For example, when the difference between the position derivation result using the sensor 5 and the previous derivation result deviates from a predetermined range (for example, when the tracking control unit 114 is less than the lower limit value of the range, When the upper limit value of the range is exceeded, it may be determined that there is an abnormality in the position derivation result. The predetermined range can be appropriately set by a prior experiment or simulation. In addition, the tracking control unit 114 obtains two derivation results using the two sensors 5 of the transport unit U1, and if these differences are larger than a predetermined threshold, It may be determined that there is an abnormality. In any example, the predetermined threshold value can be appropriately set by a prior experiment or simulation.

  In Step S57, when it is determined that there is an abnormality in the derivation result of the first position of the conveyance target T using the sensor 5, the control device 100 executes Step S58. In step S58, the tracking control unit 114 switches the sensor used for deriving the first position of the transport target T to another sensor 5 corresponding to the pinch roll 4 that is transporting the transport target T. For example, the tracking control unit 114 may switch the sensor 5 used for deriving the first position of the transport target T from the downstream side to the upstream side of the transport path R1. More specifically, the tracking control unit 114 changes the sensor 5 used for derivation of the first position of the conveyance target T to the pinch roll 4 positioned upstream from the pinch roll 4 corresponding to the sensor 5. You may switch to the corresponding sensor 5.

  Next, the control apparatus 100 performs step S59. In step S <b> 59, the pinch roll control unit 115 checks whether or not a control command for stopping the driving of the pinch roll 4 (hereinafter referred to as “stop command”) is output from the control command generation unit 111.

  When determining in step S59 that the stop command has not been output, the control device 100 returns the process to step S54. Thereafter, the drive control of the pinch roll 4 in the insertion mode is continued until a stop command is output.

  In step S59, when it is determined that the stop command is output, the control device 100 executes step S60. In step S <b> 60, the pinch roll control unit 115 controls the rotation driving units 7 corresponding to these pinch rolls 4 so as to stop the driving of all the active pinch rolls 4. Thus, the drive control of the pinch roll 4 in the insertion mode is completed. Thus, the insertion of the dummy bar 22 is completed.

  Returning to FIG. 7, when it is determined in step S51 that the control mode is not the insertion mode, the control device 100 executes step S61. In step S61, the pinch roll control unit 115 determines whether the control mode is the casting mode or the drawing mode.

  If it is determined in step S61 that the control mode is the casting mode, the control device 100 executes step S62 as shown in FIG. In step S <b> 62, the pinch roll control unit 115 controls the rotation driving units 7 corresponding to the pinch rolls 4 so as to start driving all the active pinch rolls 4.

  After execution of step S62, the control device 100 uses a sensor used for derivation of the first position of the conveyance target T among the plurality of sensors 5 from the upstream side to the downstream side of the conveyance path R1 according to the conveyance of the conveyance target T. Switch to. The control device 100 may further execute deriving the position of the slab 21 using the sensor 9. When an abnormality occurs in the derivation result of the first position of the conveyance target T using the sensors 5 and 9, the control device 100 uses the sensor used for derivation of the position as a pinch roll during conveyance of the conveyance target T. Switching to another sensor 5 corresponding to 4 may be further executed.

  For example, the control device 100 first executes step S63. In step S63, has the tip t1 of the conveyance target T passed through the pinch roll 4 positioned on the downstream side of the active pinch roll 4 (hereinafter referred to as “next pinch roll 4”)? The pinch roll control unit 115 determines whether or not.

  In step S63, when it determines with the front-end | tip part t1 having passed the following pinch roll 4 (refer FIG. 15), the control apparatus 100 performs step S64, S65 in order. In step S64, the rotation drive unit 7 corresponding to the pinch roll 4 is controlled so as to start the rotation drive of the next pinch roll 4, and the pinch roll 4 is set to be in an active state. The switching drive unit 6 corresponding to is controlled.

  In step S <b> 65, the tracking control unit 114 switches the sensor 5 used for deriving the first position of the conveyance target T among the plurality of sensors 5 to the sensor 5 corresponding to the pinch roll 4 that is newly in the active state. Thereafter, the tracking control unit 114 uses the first position of the transport target T derived using the sensor 5 before switching in step S65 as a reference, and the tracking control unit 114 sets the transport target T using the sensor 5 after switching in step S65. Derivation of the first position is performed. For example, the tracking control unit 114 obtains the movement distance L4 of the conveyance target T by the pinch roll 4 based on the output of the sensor 5 after switching, and adds it to the position P7 of the tip t1 derived using the sensor 5 before switching. Thus, the current position P8 of the tip end portion t1 is derived (see FIG. 15). Next, control device 100 causes the process to proceed to step S69 (described later).

  In step S63, when it determines with the front-end | tip part t1 not passing the next pinch roll 4, the control apparatus 100 performs step S66. In step S <b> 66, the pinch roll control unit 115 checks whether or not the tip end t <b> 1 has passed the length measuring roll 8. Here, “passing” means passing through a position corresponding to the center position of the length measuring roll 8 in the direction along the transport path R1. If it is determined in step S66 that the tip end t1 has not passed the length measuring roll 8, the control device 100 advances the process to step S69 (described later).

  If it is determined in step S66 that the tip end t1 has passed the length measuring roll 8 (see FIG. 17), the control device 100 sequentially executes steps S67 and S68. In step S67, the switching drive unit 10 is controlled so that the length measuring roll 8 is activated.

  In step S <b> 68, the tracking control unit 114 switches the sensor used for deriving the first position of the transport target T among the plurality of sensors 5 to the length measuring roll 8. Thereafter, the tracking control unit 114 uses, for example, the first position of the transport target T using the length measuring roll 8 with reference to the first position of the transport target T derived using the sensor 5 before switching in step S68. Is derived. For example, the tracking control unit 114 obtains a moving distance L5 of the conveyance target T by the pinch roll 4 based on the output of the length measuring roll 8, and adds it to the position P9 of the leading end t1 derived using the sensor 5 before switching. Thus, the current position P10 of the tip end portion t1 is derived (see FIG. 17).

  Next, the control apparatus 100 performs step S69. In step S69, the tracking control unit 114 determines whether or not there is an abnormality in the position derivation result using the sensors 5 and 9. In step S69, when it is determined that there is no abnormality in the derivation result of the first position of the conveyance target T using the sensors 5 and 9, the control device 100 advances the process to step S71 (described later). The method for determining whether or not there is an abnormality in the position derivation result is the same as in step S57.

  If it is determined in step S69 that the derivation result of the first position of the conveyance target T using the sensors 5 and 9 is abnormal, the control device 100 executes step S70. In step S <b> 70, the tracking control unit 114 switches the sensor used for deriving the first position of the transport target T to another sensor 5 corresponding to the pinch roll 4 that is transporting the transport target T. For example, the tracking control unit 114 may switch the sensor 5 used for deriving the first position of the transport target T from the downstream side to the upstream side of the transport path R1. The tracking control unit 114 uses a sensor used for deriving the first position of the transport target T as one upstream side of the pinch roll 4 corresponding to the sensor 5 used for deriving the position. You may switch to the sensor 5 corresponding to. In addition, the tracking control unit 114 uses a sensor corresponding to the pinch roll 4 that is located upstream one of the sensors 9 used for deriving the first position of the conveyance target T with respect to the sensor 9 used for deriving the position. You may switch to 5.

  Next, the control apparatus 100 performs step S71. In step S <b> 71, the pinch roll control unit 115 confirms whether or not a control command for stopping the driving of the pinch roll 4 (hereinafter referred to as “stop command”) is output from the control command generation unit 111.

  If it is determined in step S71 that the stop command has not been output, the control device 100 returns the process to step S63. Thereafter, the drive control of the pinch roll 4 in the casting mode is continued until a stop command is output.

  If it is determined in step S71 that a stop command has been output, the control device 100 executes step S72. In step S72, the pinch roll control unit 115 controls the rotation drive units 7 corresponding to the pinch rolls 4 so as to stop the driving of all the active pinch rolls 4, respectively. This completes the drive control of the pinch roll 4 in the casting mode.

  When it is determined in step S61 described above that the control mode is the drawing mode, the control device 100 executes step S73 as shown in FIG. In step S <b> 73, the tracking control unit 114 starts to derive the position of the base end portion t <b> 2 of the conveyance target T (hereinafter referred to as “second position”) using the sensor 5. The tracking control unit 114 derives the second position of the transport target T using the sensor 5 with reference to the second position of the transport target T (for example, the molten metal surface target position P0) immediately before execution of Step S73. For example, the tracking control unit 114 obtains the movement distance L6 of the conveyance target T by the pinch roll 4 based on the output of the sensor 5, and adds this to the molten metal surface target position P0, thereby obtaining the current position P11 of the base end t2. Derived (see FIG. 16).

  Next, the control apparatus 100 performs step S74. In step S <b> 74, the pinch roll control unit 115 controls the rotational drive units 7 corresponding to these pinch rolls 4 so as to start driving all the active pinch rolls 4.

  After execution of step S74, the control device 100 uses the sensors used for deriving the first position and the second position of the transport target T among the plurality of sensors 5 in the upstream of the transport path R1 according to the transport of the transport target T. You may switch from the side to the downstream side. The control device 100 may further execute deriving the first position of the slab 21 using the sensor 9. When an abnormality occurs in the derivation result of the first position and the second position of the conveyance target T using the sensors 5 and 9, the control device 100 uses the sensor used for derivation of the position to convey the conveyance target T. You may further perform switching to the other sensor 5 corresponding to the pinch roll 4 inside.

  For example, the control device 100 first executes step S75 similar to step S63. In step S75, when it is determined that the tip portion t1 has passed the next pinch roll 4, the control device 100 sequentially executes steps S76 and S77 similar to steps S64 and S65. Next, control device 100 causes the process to proceed to step S81 (described later). In step S75, when it determines with the front-end | tip part t1 not passing the next pinch roll 4, the control apparatus 100 performs step S78 similar to step S66. If it is determined in step S78 that the tip end t1 has not passed the length measuring roll 8, the control device 100 advances the process to step S81 (described later). When it is determined in step S78 that the tip end t1 has passed the length measuring roll 8, the control device 100 sequentially executes steps S79 and S80 similar to steps S67 and S68.

  Next, the control apparatus 100 performs step S81. In step S <b> 81, the base end portion of the conveyance target T is placed on the pinch roll 4 located on the most upstream side in the conveyance path R <b> 1 (hereinafter referred to as “the most upstream pinch roll 4”) among all the active pinch rolls 4. The pinch roll control unit 115 determines whether t2 (that is, the base end portion 21b of the slab 21) has approached. If it is determined in step S81 that the base end t2 is not approaching the most upstream pinch roll 4, the control device 100 advances the process to step S84 (described later).

  If it is determined in step S81 that the base end t2 has approached the most upstream pinch roll 4 (see FIG. 16), the control device 100 executes steps S82 and S83 in order. In step S <b> 82, the tracking control unit 114 sets the sensor 5 used for deriving the second position of the conveyance target T among the plurality of sensors 5 to the pinch roll 4 on the downstream side of the most upstream pinch roll 4. Switch to the corresponding sensor 5. After that, the tracking control unit 114 uses the second position of the conveyance target T derived using the sensor 5 before switching in step S82 as a reference, and the tracking control unit 114 sets the conveyance target T using the sensor 5 after switching in step S82. Derivation of the second position is performed. For example, the tracking control unit 114 obtains the movement distance L7 of the conveyance target T by the pinch roll 4 based on the output of the sensor 5 after switching, and the position P12 of the base end t2 derived using the sensor 5 before switching. By adding, the current position P13 of the base end t2 is derived (see FIG. 16).

  In step S82, the switching drive unit 6 corresponding to the pinch roll 4 is controlled so that the most upstream pinch roll 4 is in an inactive state, and the pinch roll 4 is stopped so as to stop rotating. The pinch roll control unit 115 controls the rotation driving unit 7 corresponding to the roll 4.

  Next, the control apparatus 100 performs step S84. In step S84, the tracking control unit 114 determines whether there is an abnormality in the derivation results of the first position and the second position using the sensors 5 and 9. In step S84, when it is determined that there is no abnormality in the derivation result of the first position and the second position of the conveyance target T using the sensors 5 and 9, the control device 100 advances the process to step S86 (described later). The method for determining whether or not there is an abnormality in the position derivation result is the same as in step S57.

  In Step S84, when it is determined that there is an abnormality in the derivation result of the first position or the second position of the conveyance target T using the sensors 5 and 9, the control device 100 executes Step S85. In step S85, the tracking control unit 114 switches the sensor used for deriving the position of the transport target T to another sensor 5 corresponding to the pinch roll 4 that is transporting the transport target T.

  For example, when it is determined that there is an abnormality in the derivation result of the first position, the tracking control unit 114 may switch the sensor 5 used for derivation of the first position from the downstream side to the upstream side of the transport path R1. The tracking control unit 114 uses a sensor used for deriving the first position of the transport target T as one upstream side of the pinch roll 4 corresponding to the sensor 5 used for deriving the position. You may switch to the sensor 5 corresponding to. In addition, the tracking control unit 114 uses the sensor 5 used for deriving the position of the conveyance target T as the sensor 5 corresponding to the pinch roll 4 positioned upstream from the sensor 9 used for deriving the position. You may switch.

  When it is determined that the second position derivation result is abnormal, the tracking control unit 114 may switch the sensor 5 used for derivation of the second position from the upstream side to the downstream side of the transport path R1. The tracking control unit 114 has a sensor used for deriving the second position of the conveyance target T, one pinch roll 4 positioned downstream of the pinch roll 4 corresponding to the sensor 5 used for deriving the position. You may switch to the sensor 5 corresponding to.

  Next, the control apparatus 100 performs step S86. In step S86, the pinch roll control unit 115 confirms whether or not driving of all the pinch rolls 4 that have transported the transport target T has been stopped.

  If it is determined in step S86 that there is still the pinch roll 4 being driven, the control device 100 returns the process to step S75. Thereafter, the drive control of the pinch roll 4 in the drawing mode is performed until the driving of all the pinch rolls 4 that have transported the transport target T is stopped (until the transport of the transport target T by the pinch roll 4 is completed). Will continue.

  If it is determined in step S86 that the driving of all the pinch rolls 4 that have transported the transport target T has been stopped, the control device 100 completes the process.

(4) Dummy Bar Separation / Conveyance Control Procedure Next, specific processing contents of the separation / conveyance processing started in step S26 will be described. As shown in FIG. 11, the control device 100 first executes step S91. In step S91, the dummy bar conveyance control unit 112 controls the dummy bar conveyance device 11 so as to start pulling up the dummy bar 22 by the winch 12 (see FIG. 16).

  Next, the control apparatus 100 performs step S92. In step S92, the dummy bar conveyance control unit 112 waits for the tail 22a of the dummy bar 22 to reach the conveyor 14. When the tail 22a of the dummy bar 22 reaches the conveyor 14 in step S92, the control device 100 executes step S93. In step S93, the dummy bar conveyance control unit 112 controls the dummy bar conveyance device 11 so as to stop the pulling of the dummy bar 22 by the winch 12.

  Next, the control apparatus 100 performs step S94. In step S94, the dummy bar conveyance control unit 112 controls the dummy bar conveyance device 11 so that the dummy bar 22 is pulled up on the dummy bagger 13 by the conveyor 14.

  Next, the control apparatus 100 performs step S95. In step S95, the dummy bar transport control unit 112 controls the dummy bar transport device 11 so as to start transporting the dummy bar 22 by the dummy backer 13.

  Next, the control apparatus 100 performs step S96. In step S96, the dummy bar transport control unit 112 waits for the dummy backer 13 to reach a position for inserting the dummy bar 22 into the mold 3 (hereinafter referred to as “insertion start position”).

  If it is determined in step S96 that the dummy backer 13 has reached the insertion start position, the control device 100 executes step S97. In step S97, the dummy bar transport control unit 112 controls the dummy bar transport device 11 so as to stop the transport of the dummy bar 22 by the dummy backer 13. This completes the separation / conveying process of the dummy bar 22.

2.2 Procedure for Adjusting Moving Speed As described above in the explanation of steps S04 to S07, the second casting control is executed when the next casting is started in a situation where there is a preceding slab. Hereinafter, the preceding slab (first slab) is referred to as a slab 21A, and the subsequent slab (second slab) subsequent to the slab 21A is referred to as a slab 21B (see FIG. 18). Moreover, the conveyance target object including the slab 21A is referred to as a conveyance target object T1 (first conveyance target object), and the conveyance target object including the cast piece 21B is referred to as a conveyance target object T2 (second conveyance target object). Furthermore, the active pinch roll 4 that transports the transport target T1 is referred to as a group G1 (first group) pinch roll 4, and the active pinch roll 4 that transports the transport target T2 is the group G2 (second group). It is called pinch roll 4.

  The control device 100 starts the second casting control while the first casting control is being performed on the slab 21A. In this case, deriving the position of the conveyance target T using any one of the plurality of sensors 5 means any one of the plurality of sensors 5 corresponding to the pinch rolls 4 of the group G1 that is conveying the slab 21A. Is used to derive the position of the slab 21A, and the position of the slab 21B is derived using any one of the plurality of sensors 5 respectively corresponding to the pinch rolls 4 of the group G2 carrying the slab 21B. Including.

  When the first casting control and the second casting control are performed simultaneously, the control device 100 adds the pinch roll 4 through which the leading end t11 of the transport target T1 has passed to the group G1 and the transport target T2. The pinch roll 4 that the tip t21 has passed is added to the group G2.

  Hereinafter, specific processing contents of the moving speed adjustment processing in step S07 will be described. As shown in FIG. 12, the control device 100 first executes step S101. In step S101, the control command generator 111 checks whether or not the interval L8 between the conveyance objects T1 and T2 is equal to or less than the first threshold (see FIG. 18). The first threshold value is appropriately set so that the transport target T2 can be decelerated or stopped without causing the transport target T1 and the transport target T2 to collide with each other. For example, the first threshold value can be set based on a braking distance or the like necessary for stopping the transport target T2. In step S101, when it determines with the space | interval of conveyance target object T1, T2 exceeding the 1st threshold value, the control apparatus 100 advances a process to step S109 (after-mentioned).

  In step S101, when it determines with the space | interval of conveyance target object T1, T2 being below a 1st threshold value, the control apparatus 100 performs step S102. In step S102, the control command generation unit 111 changes the target movement speed of the conveyance target T2 so as to decelerate the movement speed of the conveyance target T2. For example, the control command generation unit 111 decreases the target value of the rotation speed of the pinch roll 4 belonging to the group G2. In response to this, the pinch roll control unit 115 controls the rotation driving units 7 corresponding to these pinch rolls 4 so as to decelerate the rotation of the pinch rolls 4 belonging to the group G2.

  Next, the control apparatus 100 performs step S103. In step S103, the control command generation unit 111 checks whether or not the interval L8 between the conveyance objects T1 and T2 is equal to or smaller than the second threshold value. The second threshold may be a value smaller than the first threshold.

  In step S103, when it determines with the space | interval L8 of conveyance target object T1, T2 exceeding the 2nd threshold value, the control apparatus 100 performs step S104. In step S104, the control command generation unit 111 checks whether or not the interval L8 between the conveyance objects T1 and T2 is equal to or greater than a third threshold value. The third threshold value may be a value larger than the first threshold value.

  In step S104, when it determines with the space | interval L8 of conveyance target object T1, T2 being less than a 3rd threshold value, the control apparatus 100 returns a process to step S103. Thereafter, as long as the interval L8 between the conveyance objects T1 and T2 exceeds the second threshold value, the conveyance object T2 in the decelerated state is conveyed until the interval L8 between the conveyance objects T1 and T2 becomes equal to or greater than the third threshold value. Will continue.

  In step S104, when it determines with the space | interval L8 of conveyance target object T1, T2 being more than a 3rd threshold value, the control apparatus 100 performs step S105. In step S105, the control command generator 111 changes the target movement speed of the conveyance target T2 so as to accelerate the movement speed of the conveyance target T2. For example, the control command generator 111 increases the target value of the rotational speed of the pinch roll 4 belonging to the group G2, and returns it to the value before deceleration in step S102. In response to this, the pinch roll control unit 115 controls the rotation driving units 7 respectively corresponding to the pinch rolls 4 so as to accelerate the rotation of the pinch rolls 4 belonging to the group G2. Next, the control device 100 proceeds with the process to step S109 (described later).

  In step S103, when it determines with the space | interval L8 of conveyance target object T1, T2 being below a 2nd threshold value, the control apparatus 100 performs step S106. In step S <b> 106, the control command generation unit 111 generates a control command for stopping the transport target T <b> 2 and outputs the control command to the pinch roll control unit 115. In response to this, the pinch roll control unit 115 controls the rotation driving units 7 respectively corresponding to the pinch rolls 4 so as to stop the rotation of the pinch rolls 4 belonging to the group G2.

  Next, the control apparatus 100 performs step S107. In step S107, the control command generator 111 waits for the interval L8 between the conveyance objects T1 and T2 to be equal to or greater than the third threshold value. Thereafter, the conveyance object T2 is kept in a stopped state until the interval L8 between the conveyance objects T1 and T2 becomes equal to or greater than the third threshold value.

  If it is determined in step S107 that the interval L8 between the conveyance objects T1 and T2 is greater than or equal to the third threshold value, the switching drive unit 10 executes step S108. In step S <b> 108, the control command generation unit 111 generates a control command for resuming the conveyance of the conveyance target T <b> 2 and outputs this to the pinch roll control unit 115. In response to this, the pinch roll control unit 115 controls the rotation driving units 7 respectively corresponding to the pinch rolls 4 so as to resume the rotation of the pinch rolls 4 belonging to the group G2. Note that the control command generation unit 111 may set the target moving speed of the transport target T2 after execution of step S108 to a value before execution of step S102.

  Next, the control device 100 executes Step S109. In step S109, the control command generation unit 111 confirms whether or not the preceding slab still exists (whether or not the conveyance of the preceding slab by the pinch roll 4 is continued). If it is determined in step S109 that a preceding slab is present, the control device 100 returns the process to step S101. Thereafter, as long as the preceding slab exists, the moving speed adjustment process is continued. If it is determined in step S109 that no preceding slab is present, the control device 100 completes the movement speed adjustment process.

3. Effect of this embodiment The continuous casting apparatus 1 is arranged along the conveyance path R1 of the slab 21, and outputs a plurality of pinch rolls 4 that convey the slab 21, and information about at least the rotational speed of the plurality of pinch rolls 4, respectively. A plurality of sensors 5 to be used, the position of the conveyance target T including the slab 21 is derived using any one of the plurality of sensors 5, and the sensor used to derive the position among the plurality of sensors 5 is a conveyance target And a control device 100 configured to execute switching from the upstream side to the downstream side of the transport path R1 according to the movement of the object T.

  According to the continuous casting apparatus 1, a plurality of sensors 5 respectively corresponding to the plurality of pinch rolls 4 are used for tracking the position of the cast piece 21. The sensor used for deriving the position is switched from the upstream side to the downstream side of the transport path R <b> 1 according to the transport of the slab 21. For this reason, as long as any pinch roll 4 is in contact with the slab 21, the tracking of the position of the slab 21 can be continued. Therefore, the position of the slab 21 can be tracked more reliably.

  The control device 100 derives using the sensor 5 before switching when the sensor 5 used for deriving the position among the plurality of sensors 5 is switched from the upstream side to the downstream side of the transport path R1 according to the transport of the slab 21. The position may be derived using the sensor 5 after switching with reference to the position. In this case, sudden changes in the position derivation result associated with sensor switching are suppressed. Therefore, the position of the slab 21 can be tracked more reliably.

  When an abnormality occurs in the result of deriving the position of the conveyance target T using the sensor 5, the control device 100 corresponds to the pinch roll 4 that is conveying the conveyance target T using the sensor used for deriving the position. It may be configured to further execute switching to another sensor 5 to be performed. In this case, the tracking of the position of the slab 21 can be continued even when the sensor 5 fails.

  When an abnormality occurs in the result of deriving the position of the transport target T using the sensor 5, the sensor used for deriving the position is used as another sensor 5 corresponding to the pinch roll 4 that is transporting the transport target T. Switching to may include switching the sensor used for deriving the position from the downstream side to the upstream side of the transport path R1. As long as there is no abnormality in the position derivation result, the sensor used for position derivation is switched from the upstream side to the downstream side of the conveyance path R1 in accordance with the conveyance of the slab 21. Therefore, on the upstream side of the sensor 5 used for deriving the position of the slab, there is another sensor 5 corresponding to the pinch roll 4 that is transporting the slab (hereinafter referred to as “upstream side”). Other sensors 5 ”). When an abnormality occurs in the position derivation result, the sensor used for derivation of the position is switched from the downstream side to the upstream side, so that the other sensors 5 on the upstream side can be effectively used to track the position of the slab 21. It can be continued more reliably.

  Deriving the position using any one of the plurality of sensors 5 means that the slab 21A is used by using any one of the plurality of sensors 5 corresponding to the pinch rolls 4 of the group G1 that is transporting the slab 21A. The slab 21B is derived using one of a plurality of sensors 5 respectively corresponding to the pinch rolls 4 of the group G2 that is transporting the slab 21B following the slab 21A and deriving the position of the transport target T1 that is included. Deriving the position of the conveyance target T2 including In this case, as long as any pinch roll 4 is in contact with each of the slabs 21A and 21B, the positions of the slabs 21A and 21B can be tracked simultaneously. Therefore, since the positions of the slabs 21A and 21B can be tracked more reliably, the interval between the slabs can be shortened.

  For example, the control apparatus 100 includes a plurality of pinches so that the interval between the conveyance target T1 and the conveyance target T2 is five times or less than the minimum value of the intervals between the pinch rolls 4 adjacent along the conveyance path R1. The roll 4 may be controlled. Furthermore, the control device 100 includes a plurality of pinches so that the interval between the conveyance object T1 and the conveyance object T2 is not more than twice the minimum value of the interval between the pinch rolls 4 adjacent along the conveyance path R1. The roll 4 may be controlled. Production efficiency can be improved by shortening the interval between the conveyance object T1 and the conveyance object T2.

  The control device 100 adds the pinch roll 4 through which the leading end t11 of the transport target T1 has passed to the group G1, and adds the pinch roll 4 through which the leading end t21 of the transport target T2 has passed to the group G2. Further, it may be configured to execute. In this case, the positions of the cast slabs 21A and 21B can be tracked more reliably.

  When the continuous casting apparatus 1 is in contact with the conveyance target T, the length measurement roll 8 that rotates in accordance with the movement of the conveyance target T and a sensor 9 that outputs information on at least the rotation speed of the length measurement roll 8. And the control device 100 may be configured to further execute deriving the position of the transport target T using the sensor 9. In this case, the position of the slab 21 can be tracked with higher reliability by using a sensor specialized for position derivation.

  Although the embodiment has been described above, the present invention is not necessarily limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

  DESCRIPTION OF SYMBOLS 1 ... Continuous casting apparatus, 4 ... Pinch roll, 5 ... Sensor (1st sensor), 100 ... Control apparatus, R1 ... Conveyance path, 21 ... Slab, 21A ... Slab (first slab), 21B ... Slab (Second cast), 8 ... length measuring roll, 9 ... sensor (second sensor), T ... transport object, T1 ... transport object (first transport object), T2 ... transport object (second transport) Object), G1... Group (first group), G2... Group (second group).

Claims (9)

A plurality of pinch rolls arranged along the slab conveying path and conveying the slab,
A plurality of first sensors that respectively output at least rotational speed information of the plurality of pinch rolls;
Deriving the position of the conveyance object including the slab using any one of the plurality of first sensors, and using the sensor used for deriving the position among the plurality of first sensors of the conveyance object. A continuous casting apparatus comprising: a control device configured to perform switching from the upstream side to the downstream side of the conveyance path according to movement.   When the control device switches a sensor used for deriving the position among the plurality of first sensors from the upstream side to the downstream side of the transport path according to transport of the transport target, the first before switching The continuous casting apparatus according to claim 1, wherein the position is derived using the first sensor after switching with the position derived using a sensor as a reference.   When an abnormality occurs in the derivation result of the position of the conveyance object using the first sensor, the control device uses the sensor used for deriving the position as the pinch roll that is conveying the conveyance object. The continuous casting apparatus according to claim 1, wherein the continuous casting apparatus is further configured to further switch to the other first sensor corresponding to the first sensor.   When an abnormality occurs in the derivation result of the position of the conveyance object using the first sensor, a sensor used for derivation of the position is replaced with another sensor corresponding to the pinch roll that is conveying the conveyance object. The continuous casting apparatus according to claim 3, wherein switching to the first sensor includes switching a sensor used for deriving the position from a downstream side to an upstream side of the conveyance path.   Deriving the position using any one of the plurality of first sensors is any one of the plurality of first sensors respectively corresponding to the pinch rolls of the first group that is transporting the first slab. And deriving the position of the first conveyance object including the first slab, and corresponding to the second group of the pinch rolls that are conveying the second slab following the first slab. The continuous casting according to any one of claims 1 to 4, further comprising: deriving a position of a second conveyance object including the second cast piece using any one of the plurality of first sensors. apparatus.   The control device adds the pinch roll through which the tip of the first transport object has passed to the first group, and adds the pinch roll through which the tip of the second transport object has passed to the second group. The continuous casting apparatus according to claim 5, wherein the continuous casting apparatus is further configured to further perform the following. A measuring roll that rotates in accordance with the movement of the transport object when in contact with the transport object;
A second sensor that outputs information on at least the rotation speed of the length measuring roll, and
The continuous casting apparatus according to any one of claims 1 to 6, wherein the control device is configured to further execute deriving a position of the conveyance object using the second sensor. A plurality of pinch rolls arranged along the slab conveying path and conveying the slab,
A plurality of first sensors that respectively output at least rotational speed information of the plurality of pinch rolls;
The first conveyance object including at least the first slab and the second conveyance object including at least the second slab following the first conveyance object are simultaneously conveyed, and the first conveyance object and the A control device that controls the plurality of pinch rolls such that an interval between the second conveyance objects is 5 times or less with respect to a minimum value of an interval between the pinch rolls adjacent to each other along the conveyance path; A continuous casting apparatus. A conveyance object including the slab using any one of a plurality of first sensors that are arranged along a conveyance path of the slab and each output information on at least rotational speeds of a plurality of pinch rolls that convey the slab. Deriving the position of
A continuous casting method comprising: switching a sensor used for deriving the position among the plurality of first sensors from an upstream side to a downstream side of the transport path according to transport of the transport target.

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