JP7071171B2 - Transport device and transport method - Google Patents

Description

The present disclosure relates to a transport device and a transport method.

In the plate material production line, in order to smoothly convey the plate material while preventing out-of-plane deformation of the plate material, a device is used in which the plate material is sandwiched by a pair of upper and lower pinch rolls and the plate material is conveyed while applying tension (for example). See Patent Document 1).

Japanese Unexamined Patent Publication No. 8-108208

In a plate material production line, there may be a problem that the plate width center position of the plate material deviates from the center of the production line, a part of the plate material bites out from the pinch roll body, and the plate material is damaged. In order to avoid such a problem, in the apparatus disclosed in Patent Document 1, in addition to controlling the profile and bending force of the pinch roll, the pinch roll load on the working side and the driving side is measured and the load side is large. It is judged that the plate material is moving, and the reduction position on the side where the load is large is relatively tightened. In the following, operating the reduction device on the work side and the drive side in the opposite direction is called reduction leveling, and operating in the same direction is called simultaneous reduction. Is also used.

Here, for example, as shown in FIG. 5, consider a case where only one end of the plate material is in contact with the pinch roll in the plate material width direction due to circumstances such as uneven distribution of the plate material thickness. In this state, the reduction position on the side with a large load (one end) is relatively narrowed down, and when the transfer of the plate material by pinch roll is started, the plate material moves from the center of the line to one end due to the moment applied to the plate material. The plate material may move or deviate suddenly and deviate from the center of the line. As a measure to avoid such an event, it is often effective to suppress the tension applied to the plate material to a value smaller than a predetermined target value for operation. However, in this case, the original function of the pinch roll of applying tension to the plate material cannot be fully utilized, and depending on the situation, it may be necessary to add a pinch roll in order to obtain a predetermined tension.

The present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to prevent the plate material from deviating from the center of the line at the start of transportation.

The transport device according to one aspect of the present disclosure measures the load at each of the pinch roll that narrowly presses the plate material, the reduction device that presses the pinch roll at each of the axial end portions of the pinch roll, and the axial end ends of the pinch roll. Position measurement to measure the center position of the plate width of the load measuring device, the drive device that rotates the pinch roll to apply a predetermined tension to the plate material and conveys the plate material to the pinch roll, and the plate material conveyed by the pinch roll. A device and a control unit are provided, and the control unit controls the reduction device so as to start the reduction of the pinch roll at each of the axial end portions, and the current load value at each of the axial end portions from the load measuring device. To determine whether the pinch roll load current value, which is the total of the current load values at both ends in the axial direction, has reached the predetermined initial load, and when the initial load is reached, both ends in the axial direction. Controlling the reduction device so that the load action point position derived from the current load value in each part approaches the plate width center position measured by the position measuring device, and the load action point position and the plate width center position. To determine whether or not the separation distance is within a predetermined allowable range, and to control the pinch roll drive device so as to apply a predetermined tension to the plate material when the separation distance is within a predetermined allowable range. , Is configured to run.

In the transfer device according to the present disclosure, it is determined whether or not the current value of the pinch roll load has reached a predetermined initial load after the reduction of the pinch roll is started, and the load is derived from the current value of the load at both ends in the axial direction. The reduction device is controlled so that the position of the point of action approaches the center position of the plate width of the plate material. Here, for example, as shown in FIG. 5, when the pinch roll is in contact with only one end of the plate material, the load on the one end is large and the position of the load acting point is the one end. In the transport device according to the present disclosure, since the position of the load acting point is controlled to be close to the plate width center position of the plate material, the reduction position of the other end of the plate material is relatively tightened. Then, when the separation distance between the load acting point position and the plate width center position is within the allowable range, that is, when the load acting point position is sufficiently close to the plate width center position, the transfer of the plate material by the pinch roll is started. Therefore, the plate material is transported along the center of the line. That is, according to the transport device according to the present disclosure, it is possible to prevent the plate material from deviating from the center of the line at the start of transport.

The control unit may determine that the separation distance is within a predetermined allowable range when the separation distance is 1/6 or less of the plate width of the plate material. By setting the distance from the center position of the plate width to 1/6 or less of the plate width, the entire area of the plate material in the plate width direction comes into contact with the pinch roll, so tension is appropriately applied from the pinch roll to the plate material. At the same time, the plate material can be stably transported.

The control unit may be configured to further control the reduction device so that the load acting point position approaches the plate width center position in the state where the pinch roll is rotated. As a result, even after the transfer with tension applied to the plate material from the pinch roll is started, the plate material can be stably conveyed without meandering.

In the transport method according to one aspect of the present disclosure, the pinch roll that narrowly presses the plate material, the reduction device that presses the pinch roll at each of the axial end portions of the pinch roll, and the load at each of the axial end portions of the pinch roll are measured. Position measurement to measure the center position of the plate width of the load measuring device, the drive device that rotates the pinch roll to apply a predetermined tension to the plate material and conveys the plate material to the pinch roll, and the plate material conveyed by the pinch roll. Using the device and the transport device equipped with the device, the reduction device is controlled so as to start the reduction of the pinch roll at each of both ends in the axial direction, and the current load value at each end in the axial direction is acquired from the load measuring device. , Judgment whether the pinch roll load current value, which is the total of the current load values at both ends in the axial direction, has reached a predetermined initial load, and when the initial load is reached, at both ends in the axial direction. Controlling the reduction device so that the load action point position derived from the current load value approaches the plate width center position measured by the position measuring device, and the separation distance between the load action point position and the plate width center position. However, it is determined whether or not it is within the predetermined allowable range, and when it is within the predetermined allowable range, the drive device is controlled so as to rotate the pinch roll and apply a predetermined tension to the plate material. And, including.

According to the present disclosure, it is possible to prevent the plate material from deviating from the center of the line during transportation when tension is applied to the plate material from the pinch roll.

It is a schematic diagram which shows the schematic structure of the plate material transporting apparatus which concerns on this embodiment. It is a hardware configuration diagram of a controller. It is a flowchart which shows the execution procedure of a plate material transfer process. It is a figure which shows the state which the linear load distribution is distributed in a triangular shape over the entire plate width. It is a schematic diagram which shows the state which only one end part of a plate material comes into contact with a pinch roll. It is a schematic diagram which shows the bias of a plate material according to a moment.

Hereinafter, embodiments will be described in detail with reference to the drawings. In the description, the same elements or elements having the same function are designated by the same reference numerals, and duplicate description will be omitted.

[Plate transfer device]
First, with reference to FIG. 1, the outline of the plate material transfer device 100 (conveyor device) according to the present embodiment will be described. The plate material transport device 100 is an apparatus that transports the plate material 2 in a predetermined transport direction while sandwiching the plate material 2 with a pair of upper and lower pinch rolls 1a and 1b in the plate material 2 manufacturing / processing line. The plate material transfer device 100 includes a pinch roll 1a, 1b, a reduction device 3a, 3b, a load cell 4a, 4b (load measuring device), a position measuring device 5, a pinch roll driving device 6 (driving device), and a controller 50. (Control unit) and.

The pinch rolls 1a and 1b are rotating bodies that sandwich the plate material 2 from above and below with a predetermined pressure and transport the plate material 2 in a predetermined transport direction. The pinch rolls 1a and 1b rotate by applying a rotational force to the pinch roll drive device 6, and apply tension to the sandwiched plate material 2 to convey the plate material 2. The pinch rolls 1a and 1b are connected to the pinch roll drive device 6 on the drive side DS, and tension is applied to the plate material 2 via the pinch roll torque. The pinch rolls 1a and 1b have, for example, a convex crown shape. One end side (drive side DS) in the axial direction of the upper pinch roll 1a is connected to the reduction device 3a via a chock, and the other end side (working side WS) in the axial direction is connected to the reduction device 3b via the chock. It is connected. The drive side DS in the lower pinch roll 1b is connected to the load cell 4a via the chock, and the working side WS is connected to the load cell 4b via the chock.

The reduction devices 3a and 3b reduce the pinch roll 1a at each of the drive side DS and the work side WS (both ends in the axial direction) of the pinch roll 1a. The reduction device 3a reduces the drive side DS of the pinch roll 1a. The reduction device 3b reduces the working side WS of the pinch roll 1a. The reduction devices 3a and 3b start the reduction of the pinch roll 1a according to the control of the controller 50.

The load cells 4a and 4b measure the load on each of the drive side DS and the work side WS of the pinch roll. The load cell 4b measures the load on the working side WS of the pinch roll 1b. The load cells 4a and 4b continuously (always) measure the current load values on the drive side DS and the work side WS and output them to the controller 50. The load value output to the controller 50 is used for the reduction control of the reduction devices 3a and 3b (details will be described later).

The position measuring device 5 measures the plate width center position _zC of the plate material 2 conveyed by the pinch rolls 1a and 1b. The position measuring device 5 continuously (always) measures the plate width center position _zC of the plate material 2. The position measuring device 5 is fixedly arranged, for example, at a predetermined position, and is a plate in the plate width direction of the plate material 2 being conveyed from the detected plate end position of the plate material and the known plate width of the plate material 2. The width center position z _C is derived. Alternatively, when the plate width of the plate material 2 is not known, the position measuring device 5 may derive the plate width center position _zC of the plate material 2 by measuring the positions of both ends of the plate material 2 in the plate material width direction. The position measuring device 5 outputs the measured plate width center position _zC of the plate material 2 to the controller 50. The position measuring method by the position measuring device 5 is not limited, and for example, a known sensor such as a photomicro sensor, an area sensor, a photoelectric sensor, a proximity sensor, a fiber sensor, or a laser sensor can be used.

The pinch roll drive device 6 rotates the pinch rolls 1a and 1b to apply a predetermined tension to the plate material 2 and conveys the plate material 2 to the pinch rolls 1a and 1b. The pinch roll drive device 6 rotates the pinch rolls 1a and 1b in response to a control signal from the controller 50.

The controller 50 controls the reduction devices 3a and 3b so as to start the reduction of the pinch roll 1a on each of the drive side DS and the work side WS in a state where the pinch rolls 1a and 1b are in contact with the plate material 2, and the load cell. Whether the current load value of the drive side DS and the work side WS is obtained from 4a and 4b, and the pinch roll load current value, which is the total of the current load values of the drive side DS and the work side WS, has reached the predetermined initial load. The position measuring device 5 determines whether or not the load is applied, and when the initial load is reached, the position of the load action point derived from the current load values in each of the drive side DS and the work side WS acquired from the load cells 4a and 4b is determined. Controlling the reduction devices 3a and 3b so as to approach the plate width center position z _C in the plate width direction of the plate material 2 measured by the above, and the separation distance between the load acting point position and the plate width center position z _C. When it is determined whether or not it is within the predetermined allowable range, and when it is confirmed that the current value of the pinch roll load has reached the predetermined set load as well as within the predetermined allowable range, the plate material 2 is predetermined. It is configured to control and execute the pinch roll drive device 6 to apply tension.

Hereinafter, a specific configuration example of the controller 50 will be described. The controller 50 has a reduction start unit 7, a load determination unit 8, a reduction control unit 9, a load action point position determination unit 10, and a drive control unit 11 as functional modules.

The reduction start unit 7 controls the reduction devices 3a and 3b so that the reduction of the pinch rolls 1a is started on each of the drive side DS and the work side WS in a state where the pinch rolls 1a and 1b are in contact with the plate material 2. The reduction start portion 7 can detect whether or not the pinch rolls 1a and 1b are in contact with the plate material 2 by the following method. That is, in the reduction start portion 7, for example, when the distance between the upper and lower pinch rolls 1a and 1b is smaller than the plate thickness of the plate material 2, the load cell 4a, when the plate material 2 bites into the pinch rolls 1a and 1b, From the change in the current load value measured by 4b, it is detected that the plate material 2 is in contact with the pinch rolls 1a and 1b. Alternatively, when the plate material 2 is introduced in a state where the distance between the upper and lower pinch rolls 1a and 1b is larger than the plate thickness of the plate material 2, the reduction start portion 7 places a detector for the plate material 2 in the vicinity of the pinch rolls 1a and 1b. By deploying, it is detected that the plate material 2 is in contact with the pinch rolls 1a and 1b.

Upon detecting that the plate material 2 is in contact with the pinch rolls 1a and 1b, the reduction start portion 7 immediately simultaneously reduces the reduction devices 3a and 3b (simultaneous reduction of the drive side DS and the work side WS), and the pinch roll 1a, The narrowing pressure of the plate material 2 by 1b is started. By starting the narrowing pressure of the plate material 2 by the pinch rolls 1a and 1b, the load measured in the load cells 4a and 4 gradually increases.

The load determination unit 8 acquires the current load values of the drive side DS and the work side WS from the load cells 4a and 4b, and determines the pinch roll load current value which is the total of the current load values of the drive side DS and the work side WS. It is determined whether or not the initial load of is reached. Here, the initial load is the total load of the drive side DS and the work side WS when the plate material 2 is conveyed by the pinch rolls 1a and 1b, that is, the set load required to apply a predetermined tension to the plate material 2. The load is smaller than that. The initial load is, for example, about 10 to 20% of the set load.

The set load is determined as follows, for example. For example, when a tension of 10 MPa per unit cross-sectional area is applied to a plate material 2 having a plate thickness of 1 mm and a plate width of 1000 mm, the total tension to be applied from the pinch rolls 1a and 1b to the plate material 2 is 10 kN. If the coefficient of friction between the pinch rolls 1a and 1b and the plate material 2 is expected to be, for example, 0.2 or more even when various variable factors are taken into consideration, the friction coefficient between the pinch rolls 1a and 1b and the plate material 2 is assumed to be 0.2 or more. The set load that does not cause slip is 10 kN × 0.5 / 0.2 = 25 kN or more. Here, the reason why the factor of 0.5 is applied is that the frictional force to be supplied from one side is calculated in consideration of the frictional force acting on the upper and lower surfaces of the plate material 2.

When the initial load is reached, the processing of the reduction control unit 9 is started. Therefore, for example, when the plate thickness difference of the plate material 2 is large (the contact state between the pinch rolls 1a and 1b and the plate material 2 is non-uniform). In such cases, it is preferable to reduce the initial load as much as possible and control the reduction control unit 9 so that the processing can be started promptly.

When the initial load is reached, the reduction control unit 9 measures the position of the load action point derived from the current load value in each of the drive side DS and the work side WS acquired from the load cells 4a and 4b by the position measuring device 5. The reduction leveling is performed so as to approach the plate width center position z _C in the plate material width direction of the plate material 2. The reduction leveling means that the drive side DS and the work side WS of the reduction devices 3a and 3b are operated in opposite directions.

The reduction control unit 9 obtains the position of the load acting point by the following equation (1). In the following equation (1), the distance between the reduction positions of the drive side DS and the work side WS is a, and the measured values of the load cells 4a and 4b are P _D and P _W , and they act between the plate material 2 and the pinch rolls 1a and 1b. Let z _P be the position of the load acting point when the load distribution is replaced with a concentrated load equivalent in terms of the load applied to the plate 2 and the moment.

Here, for example, at the start of reduction leveling, when only the end portion of the working side WS in the plate material 2 is in contact with the pinch roll 1a as shown in FIG. 5, the load acting point position is the end portion of the working side WS. In this case, in order to bring the load action point position closer to the plate width center position _zC of the plate material 2 in the vicinity of the line center LC, the reduction position of the drive side DS is narrowed down and the reduction position of the work side WS is opened. Perform reduction leveling in the direction of The reduction leveling is a control in the opposite direction to the conventional reduction leveling (further narrowing down the reduction position on the side with a large load) disclosed in Patent Document 1 described above.

As a result of the reduction leveling, the load acting point position determination unit 10 determines whether or not the separation distance between the load acting point position and the plate width center position _zC is within a predetermined allowable range. For example, when the distance between the load action point position and the plate width center position _zC is 1/6 or less of the length of the plate material 2 in the plate width direction, the load action point position determination unit 10 has the separation distance. It is determined that it is within the predetermined allowable range.

In FIG. 4, for example, as shown in FIG. 5, reduction leveling is performed so that the reduction position of the drive side DS is relatively narrowed from the state where the plate material 2 is in contact with the pinch roll 1a only at the end of the work side WS. It shows a state where the entire width of the plate material 2 and the pinch roll 1a have started to come into contact with each other, and schematically shows the distribution in the width direction of the load (line load) per unit width of the pinch roll 1a and the plate material 2. In this state, the linear load at the end of the drive side DS is zero, which is a triangular distributed line load. The position of the load acting point in this case is the center of gravity of the triangle showing the linear load distribution. The center of gravity is a position closer to the working side WS by 1/6 of the plate width b from the plate width center position _zC in the plate material width direction of the plate material 2. In this state, since the entire width of the plate material 2 and the pinch roll 1a are in contact with each other, it is necessary to avoid a state in which a moment in the direction of rotating the upstream side of the plate material 2 to the working side WS as shown in FIG. 6 acts. (Details will be described later), and a stable through plate can be realized. From the above, the permissible range of the separation distance is set to 1/6 or less of the length of the plate material 2 in the plate material width direction.

The drive control unit 11 controls the pinch roll drive device 6 so as to rotate the pinch rolls 1a and 1b to apply a predetermined tension to the plate material 2 when the separation distance is within a predetermined allowable range. More specifically, the drive control unit 11 gives a predetermined torque increment to the pinch rolls 1a and 1b when the separation distance is within a predetermined allowable range and the current value of the pinch roll load reaches a predetermined set load. The pinch roll drive device 6 is controlled so as to apply a predetermined tension to the plate material 2. Even after the current pinch roll load reaches the set load, simultaneous reduction control of the reduction devices 3a and 3b (simultaneous reduction of the drive side DS and work side WS) is required to maintain the set load in preparation for disturbances such as plate thickness fluctuations. Reduction) will continue.

Further, in the reduction control unit 9, when the pinch rolls 1a and 1b are rotating (the plate material 2 is being conveyed), the load acting point position is the plate width center position z _C in the plate material width direction of the plate material 2. Perform reduction leveling so that it approaches. The reduction leveling control is performed with the load acting point position and the plate width center position z _C in the plate material width direction in order to prevent the plate material 2 from tilting as shown in FIG. 6 due to the tension acting from the pinch rolls 1a and 1b. The distance is preferably controlled within a range of 1/6 or less of the plate width.

As shown in FIG. 2, the controller 50 is composed of a circuit 51 having one or more processors 53, a memory 54, a storage 55, an input / output port 56, and an input unit 57. The input / output port 56 receives a control signal related to the user's input from the input unit 57, receives a control signal related to the plate width center position _zC of the plate material 2 from the position measuring device 5, and receives the drive side DS and the drive side DS from the load cells 4a and 4b. Upon receiving the control signal related to the load of each WS on the working side, the control signal is output to the reduction devices 3a and 3b, and the control signal related to the pinch roll drive is output to the pinch roll drive device 6. The input unit 57 is connected to the input / output port 56 and receives input by the operator. The input unit 57 is composed of, for example, an operation switch, a keyboard, a mouse, a touch panel, or the like. The input unit 57 may be connected to the input / output port 56 via a network line, for example.

The storage 55 records a program for executing the process by the controller 50. The storage 55 may be any computer readable. Specific examples include hard disks, non-volatile semiconductor memories, magnetic disks, optical disks, and the like. The memory 54 temporarily stores the program loaded from the storage 55, the calculation result of the processor 53, and the like. The processor 53 constitutes each of the above-mentioned functional modules by executing a program in cooperation with the memory 54.

The hardware configuration of the controller 50 is not necessarily limited to the one that configures each functional module by a program. For example, each functional module of the controller 50 may be configured by a dedicated logic circuit or an ASIC (Application Specific Integrated Circuit) that integrates the logic circuit.

[Plate transport processing]
Next, as an example of the transport method, the transport processing procedure of the plate material 2 at the start of transport performed by the controller 50 will be described. As shown in FIG. 3, the controller 50 executes steps S1 to S10.

In step S1, the reduction start portion 7 determines whether or not the plate material 2 has reached the pinch roll 1a. Specifically, the reduction start portion 7 makes the determination by detecting whether or not the pinch rolls 1a and 1b are in contact with the plate material 2. If it is determined that the plate material 2 has reached the pinch roll 1a, step S2 is executed, and if it is determined that the plate material 2 has not reached the pinch roll 1a, step S1 is executed again after a predetermined time has elapsed.

In step S2, the reduction start unit 7 simultaneously reduces the reduction devices 3a and 3b (simultaneous reduction of the drive side DS and the work side WS), and starts the narrowing of the plate material 2 by the pinch rolls 1a and 1b.

In step S3, the load determination unit 8 acquires the current load values of the drive side DS and the work side WS from the load cells 4a and 4b, and is the sum of the current load values of the drive side DS and the work side WS, respectively. It is determined whether or not the current value has reached a predetermined initial load. When it is determined that the current value of the pinch roll load has reached a predetermined initial load, steps S4 and S6 are executed.

In step S4, the reduction control unit 9 performs reduction leveling so that the position of the load acting point approaches the plate width center position _zC in the plate width direction of the plate material 2.

In step S5, as a result of the reduction leveling, is the separation distance between the load acting point position and the plate width center position _zC within a predetermined allowable range (whether the load acting point position is close to the plate width center)? Judge whether or not. For example, when the distance between the load action point position and the plate width center position _zC is 1/6 or less of the length of the plate material 2 in the plate width direction, the load action point position determination unit 10 has the separation distance. It is determined that it is within the predetermined allowable range. If it is determined that it is within the permissible range, step S9 is executed on condition that step S7 is completed, and if it is determined that it is not within the permissible range, reduction leveling (step S4) is continuously executed. Will be done.

Simultaneous reduction is continued in step S6, and in step S7, the load determination unit 8 determines whether or not the current value of the pinch roll load has reached the set load required to apply a predetermined tension to the plate material 2. .. If it is determined that the product has not been reached, the reduction is continued (step S6).

In step S9, the drive control unit 11 controls the pinch roll drive device 6 so as to apply a predetermined torque increment to the pinch rolls 1a and 1b and apply a predetermined tension to the plate material 2.

After the transfer of the plate material 2 is started by step S9, in step S10, the reduction control unit 9 stabilizes the plate passage in a state where the pinch rolls 1a and 1b are rotating (a state in which the plate material 2 is conveyed). Therefore, the reduction leveling is performed by controlling each of the drive side DS and the work side WS of the reduction devices 3a and 3b. Further, in step S8, simultaneous reduction control for maintaining the set load is performed. As described above, during the transfer work, the continuous stable transfer work is carried out by continuously performing the reduction leveling control for stabilizing the plate passing and the simultaneous reduction control for maintaining the set load.

[Action and effect of this embodiment]
Conventionally, in a plate material manufacturing / processing line, in order to prevent out-of-plane deformation of the plate material and smoothly convey the plate material while applying tension to the plate material, the plate material is sandwiched and conveyed by a pair of driven upper and lower pinch rolls. The device is used. In such an apparatus, the center of the plate width of the plate material deviates from the center of the plate material manufacturing / processing line, and in the worst case, a part of the plate material may be squeezed out from the pinch roll body and the plate material may be damaged. In order to avoid such an event, for example, in Patent Document 1, in addition to controlling the profile and bending force of the pinch roll, the load on the working side and the driving side is measured, and the plate material moves to the side where the load is large. Disclosed is a device that controls the reduction position in a direction in which the reduction position on the side with a large load is relatively tightened. In this device, the load is measured and the reduction position on the side with the larger load is relatively tightened, that is, the reduction is performed in the direction in which the load on the work side and the drive side, which has the larger load, further increases, at least temporarily. Carry out leveling.

In the device as disclosed in Patent Document 1, when the transfer of the plate material is started, the pinch roll drive device is operated after reaching a predetermined set load with the tip of the plate material pinched by the pinch roll. Tension is applied to the plate material. However, immediately after the tension is applied, an event may occur in which the plate material rapidly moves or deviates from the center of the line in the width direction as the plate material progresses. As a measure for avoiding the event, for example, it is conceivable to suppress the tension applied to the plate material to a value smaller than a predetermined target value for operation. However, with this measure, the original function of the pinch roll of applying tension to the plate material cannot be fully utilized, and in some cases, it may be necessary to add a pinch roll in order to obtain a predetermined tension.

The present inventors have repeatedly investigated the relationship between the process of applying tension to the plate material from the pinch roll and the behavior of the plate material, and obtained the following findings (A) and (B).

(A) Generally, when starting the transfer of the plate material, first, the reduction device is operated to pinch the plate material with a pinch roll until a predetermined set load is reached. Then, when a predetermined set load is realized, the drive device is operated to apply a predetermined tension to the plate material. At this time, the contact state between the pinch roll and the plate material may be non-uniform depending on the plate thickness distribution of the plate material. For example, in the example shown in FIG. 5, the plate thickness of the working side WS of the plate material 2 is larger than the plate thickness of the driving side DS. In this case, under the condition that the pinch roll load is small, the pinch roll 1a comes into contact with only the end portion of the working side WS of the plate material 2. When the pinch roll drive device 6 is operated in this state to apply tension in the transport direction to the plate material 2, the driving force is transmitted to the plate material 2 via the pinch roll 1a and the plate material contact surface, and the WS end of the plate material 2 on the working side. The transport direction force is intensively applied to the portion. As a result, as shown in FIG. 6, a moment in the direction of rotating the upstream side of the plate material 2 toward the working side WS acts, and the upstream side of the plate material 2 tilts toward the working side WS. Then, it is considered that the plate material 2 moves toward the working side WS because the plate material 2 advances perpendicular to the pinch roll axis with the rotation of the pinch rolls 1a and 1b.

(B) Consider a case where the reduction leveling as described in Patent Document 1 is performed before and after the pinch roll load becomes the set load at the start of the above transfer. In the reduction leveling of Patent Document 1, since the operation of relatively narrowing the reduction position on the side with a large load is performed, for example, as shown in FIG. 5, only the end portion of the WS on the working side is in contact with the pinch roll 1a. When the reduction leveling is performed with, the reduction position of the work side WS, that is, the side with a large load, is narrowed down as compared with the drive side DS, so that the pinch roll 1a locally contacts the end of the work side WS. Will be done. Therefore, even if the pinch roll drive device 6 is operated after performing the reduction leveling as described in Patent Document 1, the moment in the direction of rotating the upstream side of the plate material 2 to the working side WS as shown in FIG. It is not possible to avoid the phenomenon that the plate material 2 approaches the working side WS due to the action of.

Based on the above findings, the present inventors have solved the problems of the prior art when starting the transportation of the plate material, and while holding the plate material well at the center position in the width direction of the plate material manufacturing / processing line, the pinch roll drive device. I came up with a method of applying tension to the plate material by manipulating.

That is, the plate material transporting device 100 of the present embodiment has the pinch rolls 1a and 1b that narrowly press the plate material 2, and the reduction devices 3a and 3b that reduce the pinch rolls 1a on the drive side DS and the work side WS of the pinch rolls 1a and 1b, respectively. The pinch roll 1a is formed by rotating the load cells 4a and 4b for measuring the load on the drive side DS and the work side WS of the pinch rolls 1a and 1b and the pinch rolls 1a and 1b to apply a predetermined tension to the plate material 2. , 1b, a pinch roll drive device 6 for transporting the plate material 2, a position measuring device 5 for measuring the plate width center position _zC of the plate material 2 conveyed by the pinch rolls 1a, 1b in the plate material width direction, and a controller 50. The controller 50 controls the reduction devices 3a and 3b so as to start the reduction of the pinch roll 1a on the drive side DS and the work side WS, respectively, and the drive side DS and the work side from the load cells 4a and 4b. The current load value for each WS is acquired, and it is determined whether or not the current pinch roll load, which is the total of the current load values for the drive side DS and the work side WS, has reached a predetermined initial load, and the initial load. The position of the load action point derived from the current load value in each of the drive side DS and the work side WS acquired from the load cells 4a and 4b is the plate material width direction of the plate material 2 measured by the position measuring device 5. The drive side DS and the work side WS of the reduction devices 3a and 3b are controlled so as to approach the plate width center position z _C , and the separation distance between the load acting point position and the plate width center position z _C is predetermined. After determining whether or not it is within the allowable range and confirming that the current value of the pinch roll load has reached the predetermined set load when it is within the predetermined allowable range, the pinch rolls 1a and 1b are used. It is configured to control the pinch roll drive device 6 so as to rotate and apply a predetermined tension to the plate material 2 and to execute.

In the plate material conveying device 100, it is determined whether or not the current pinch roll load has reached a predetermined initial load after the reduction of the pinch rolls 1a and 1b is started, and the current load values of the drive side DS and the work side WS are determined. The drive side DS and the work side WS of the reduction devices 3a and 3b are controlled so that the position of the load acting point derived from is close to the plate width center position _zC in the plate material width direction of the plate material 2. Here, for example, as shown in FIG. 5, when the pinch roll 1a is in contact with only one end of the plate material 2, the load on the one end is large and the position of the load acting point is the one end. .. In the plate material transport device 100, the position of the load acting point is controlled to be close to the plate width center position _zC of the plate material 2, so that the reduction position of the other end of the plate material 2 is relatively tightened. Then, when the distance between the load acting point position and the plate width center position z _C is within the allowable range, that is, when the load acting point position is sufficiently close to the plate width center position z _C , the pinch rolls 1a and 1b are used. Since the transfer of the plate material 2 is started, the plate material 2 is conveyed along the line center cl. That is, according to the plate material transport device 100, it is possible to prevent the plate material 2 from coming off the line center cl at the start of transport.

When the separation distance between the load acting point position and the plate width center position _zC is 1/6 or less of the length of the plate material 2 in the plate material width direction, the controller 50 has the separation distance within the above-mentioned predetermined allowable range. Is determined to be. Since the distance from the plate width center position _zC is 1/6 or less of the plate width, the entire area of the plate material 2 in the plate width direction comes into contact with the pinch rolls 1a and 1b. Tension can be appropriately applied to the plate material 2 from 1b. Further, since the entire area of the plate material 2 in the plate material width direction is in contact with the pinch rolls 1a and 1b, the work side is on the upstream side with respect to the plate material 2 as in the case where the plate material 2 is in contact with the pinch roll only at the end portion. The plate material 2 can be stably conveyed without a state in which a moment in the direction of rotation acts on the WS.

After a predetermined tension is applied to the plate material 2, the controller 50 performs pinch roll simultaneous reduction control for maintaining the pinch roll set load and reduction leveling control for plate through stability in preparation for disturbance such as plate thickness fluctuation. Implement continuously. The reduction leveling control is basically a control that relatively narrows the reduction device on the side where the plate material is closer, but also in this case, in order to avoid tilting the plate material due to the tension acting from the pinch roll, as shown in FIG. Control is performed within the range where the distance between the load acting point position and the plate width center position is 1/6 or less. As a result, even after the transfer of the plate material 2 by the pinch rolls 1a and 1b is started, the plate material 2 can be stably conveyed without meandering.

Although the embodiments have been described above, the present invention is not limited to the above embodiments. For example, when determining the position of the load acting point, the linear load distribution in the plate material was assumed to be a linear distribution, but even if the linear load distribution becomes a curved distribution due to the pinch roll profile or the plate thickness distribution, the load acting point position is used. The above-mentioned control can be performed by suppressing the distance of the plate width center position z _C to a predetermined allowable range.

1a, 1b ... pinch roll, 2 ... plate material, 3a, 3b ... reduction device, 4a, 4b ... load cell (load measuring device), 5 ... position measuring device, 6 ... pinch roll driving device (driving device), 50 ... controller ( Control unit), 100 ... Plate transfer device, DS ... Drive side, WS ... Work side, z _C ... Plate width center position.

Claims (4)

A pinch roll that narrows the plate material and
A reduction device that reduces the pinch roll at both ends in the axial direction of the pinch roll, and a reduction device that reduces the pinch roll.
A load measuring device for measuring the load at both ends of the pinch roll in the axial direction, and a load measuring device.
A drive device that adjusts the tension applied to the plate material to a predetermined tension by rotating the pinch roll and conveys the plate material to the pinch roll.
A position measuring device for measuring the center position of the plate width of the plate material conveyed by the pinch roll, and a position measuring device.
With a control unit,
The control unit
Controlling the reduction device so as to start the reduction of the pinch roll at each of the both ends in the axial direction.
Whether or not the pinch roll load current value, which is the sum of the current load values at each of the axial end portions, has reached a predetermined initial load by acquiring the current load value at each of the axial end portions from the load measuring device. Judgment and
When the initial load is reached, the reduction device is such that the position of the load action point derived from the current load value at each of the both ends in the axial direction approaches the center position of the plate width measured by the position measuring device. To control and
Determining whether or not the separation distance between the load acting point position and the plate width center position is within a predetermined allowable range, and
To control the drive device to apply a predetermined torque increment to the pinch roll and adjust the tension applied to the plate to a predetermined tension when the pinch roll is within the predetermined allowable range. It is configured in the transport device. The transport device according to claim 1, wherein the control unit determines that the separation distance is within the predetermined allowable range when the separation distance is 1/6 or less of the length in the width direction of the plate material. .. After the tension applied to the plate material is adjusted to a predetermined tension, the control unit executes control of the reduction device for stabilizing the plate passage while maintaining the separation distance within the predetermined allowable range. The transport device according to claim 1 or 2, which is configured to be the same. A pinch roll that narrowly presses the plate material, a reduction device that reduces the pinch roll at each of the axial ends of the pinch roll, a load measuring device that measures the load at each of the axial ends of the pinch roll, and the pinch. By rotating the roll, the tension applied to the plate material is adjusted to a predetermined tension, and the plate width of the drive device for transporting the plate material to the pinch roll and the plate material conveyed by the pinch roll. Using a transfer device equipped with a position measuring device for measuring the center position,
Controlling the reduction device so as to start the reduction of the pinch roll at each of the both ends in the axial direction.
Whether or not the pinch roll load current value, which is the sum of the current load values at each of the axial end portions, has reached a predetermined initial load by acquiring the current load value at each of the axial end portions from the load measuring device. Judgment and
When the initial load is reached, the reduction device is such that the position of the load action point derived from the current load value at each of the both ends in the axial direction approaches the center position of the plate width measured by the position measuring device. To control and
Determining whether or not the separation distance between the load acting point position and the plate width center position is within a predetermined allowable range, and
A transport method comprising controlling the drive device to adjust the tension applied to the plate material to a predetermined tension by giving a predetermined torque increment to the pinch roll when the pinch roll is within the predetermined allowable range. ..

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