JPH073809U - Steel strip meandering correction device - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the controllability of meandering and to prevent the extension of the helicopter caused by a sudden correction operation. [Structure] A device in which steering rolls 1 and 2 are arranged at intervals in the running line direction of a steel strip S and orthogonal to the line, and the positions of the steering rolls 1 and 2 are adjusted to correct meandering. At both steering rolls 1,
2, a meandering detector 11, which is provided at intervals in the traveling line direction and detects the center position or edge of the steel strip S,
12 and a meandering control device that calculates the meandering amount based on the output signals from both meandering detectors 11 and 12 and controls the position of the steering roll 1 on the upstream side to correct the meandering amount.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for correcting meandering of a steel strip in a running line of the steel strip.

[0002]

[Prior art]

 It is important for quality such as the shape of the steel strip to correct the meandering in the running line of the steel strip so that the steel strip coincides with the line center.

Therefore, as a device for correcting the meandering of a steel strip in a steel strip process line, for example, Japanese Utility Model Laid-Open No. 3-68910 has a steering roll that comes into contact with the steel strip, and the steering roll is used to move the steel strip to the steel strip. There is disclosed a device that corrects the meandering by adjusting the pushing amount of the steel strip and adjusting the winding angle of the steel strip around the deflector roll.

[0004]

[Problems to be solved by the device]

 However, in the conventional meandering correction device of this type including the device disclosed in the above publication, the line center is detected by the meandering detection device, and when the detected line center position is deviated from the target line center, CPC (Center Position Control) is performed by adjusting the position of the steering roll to suppress the meandering of the steel strip.

Therefore, the conventional example does not consider the steel strip center position or the meandering at a position other than the meandering detecting device. In general, even if a control signal for the steering roll on the upstream side is given only based on the center position of a certain meandering detection device, the control output is not appropriate enough to completely correct the meandering. As a result, when the distance from the next steering roll is large, a slight error in the control signal for the steering roll on the upstream side appears as a large amount of meandering on the downstream side.

Further, when the amount of meandering is large, a rapid correction operation is required, so that the steel strip tends to extend in a helicopter.

Therefore, an object of the present invention is to improve the controllability of meandering, prevent the steel strip from meandering greatly, and prevent the helicopter extension due to the abrupt correction operation.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention arranges steering rolls orthogonally to the line at intervals in the running line direction of the steel strip, and adjusts the position of the steering rolls to correct the meandering. In the device described above, a meandering detector that is provided between the two steering rolls at intervals in the traveling line direction and detects the center position or edge of the steel strip, and the meandering detector based on the output signals from both meandering detectors. The configuration is to have a meandering control device that calculates the amount and controls the position of the steering wheel on the upstream side to correct the amount of meandering.

[0009]

[Action]

 In the present invention, a meandering detector is provided between the steering rolls at intervals in the traveling line direction to detect the center position or edge of the steel strip.

As described above, in general, even if a control signal for the steering roll on the upstream side is given based on only the center position of a certain meandering detection device, the control output thereof is appropriate enough to completely correct the meandering. Not a thing. On the other hand, according to the present invention, another second meandering detector is provided between the second side meandering detector and the downstream side steering roll, and when the PI control for the steering roll is performed by the first upstream meandering detector, the second meandering detector is provided. By providing the detection signal from the detector as a correction signal, excellent meandering correction controllability can be obtained.

In addition, as described above, the output signal of the second meandering detector improves the meandering correction controllability by the first steering roll on the upstream side, and as a result, reduces the meandering control amount on the second steering roll on the downstream side. There is also an advantage, and as a result, a sudden correction operation is not necessary, and problems such as helicopter extension can be solved. Moreover, the relationship between the separation distance between the first meandering detector and the second meandering detector and the actual amount of meandering that could not be corrected between them is compared with the amount of meandering in the second steering roll whose position is known. Therefore, it can be grasped as the amount of meandering to the second steering roll, and thus the meandering controllability of the second steering roll becomes good.

Further, when the outputs of the first and second meandering detectors show an abnormality as an absolute value or a correlation value, it can be grasped that one of the meandering detectors itself has a trouble, Another advantage is that the normal meander detector can be used, and as a result, one can be used as a buffer.

Further, when the amount of meandering that occurs up to the above-mentioned second steering roll shows a certain limit value, it can be judged as a so-called roll-out in which the steel strip comes off the second steering roll, and conversely, that roll-out occurs. It can be prevented by issuing an alarm to the.

[0014]

【Example】

 Hereinafter, the present invention will be described in more detail by way of examples with reference to the drawings. A first steering roll 1 and a second steering roll 2 are arranged at right angles to the running line direction of the steel strip S and orthogonal to the line. These stearing rolls 1 and 2 are adapted to adjust their positions, for example, the moving amount in the direction orthogonal to the line to correct the meandering.

In the present invention, meandering detectors 11 and 12 are provided between the first and second steering rolls 1 and 2 at intervals in the traveling line direction. As the meandering detector, a well-known one having, for example, a pair of an upper and lower light emitter and a light receiver for detecting the side portion of the steel strip S can be used. Thereby, the positions of the light transmitter and the light receiver are known, and the light receiving limit position can be detected as the edge of the steel strip S. As a result, the deviation between the intermediate position of both edges and the target line center CL position can be grasped as the meandering amount, which is denoted by dZ ₁ in FIG.

In the conventional CPC, based on only the detected meandering amount dZ ₁ obtained by proportionally integrating the signals from the drive side and the work side in the first meandering detector 11 by the proportional-plus-integral amplifier 13, the first steering roll In order to correct the meandering by 1, the center position was controlled. The central position control is a control amount based on the deviation between the meandering amount dZ ₁ obtained by proportionally integrating the meandering amount and the current position signal by the position detector 4 provided on the moving cylinder 3 of the first steering roll 1. Is.

In the present invention, the meandering amount dZ ₂ obtained by proportionally amplifying the edge signals from the drive side and the work side by the proportional amplifier 14 in the second meandering detector 11 is corrected in the control in the first steering roll 1. Used as a value.

That is, in the comparator 15, (second meandering amount dZ ₂ −first meandering amount dZ ₁ ) is calculated, and the correction amount is set by the corrector 16 based on the deviation, and this correction amount d Z Is given to the adder 17 as an injection control amount.

On the other hand, for example, when correcting the meandering at an arbitrary meandering correction position downstream of the second meandering detector 12, for example, the position of the second steering roll 2, with the first steering roll 1 as a reference, , You can correct the meandering as follows.

That is, the meandering amount y of the second steering roll 2 can be estimated by the following equation (1). y = x (dZ ₂ −dZ ₁ ) / D (1) Therefore, in order to eliminate this meandering amount y, it can be given to the second steering roll 2 as a correction amount. When a meandering detector is provided on the downstream side of the second steering roll 2, the gain amount is set by the gain setting device 30 for the calculated meandering amount y, and then on the downstream side of the second steering roll 2. It can be given as a correction amount to the input control amount from the provided meandering detector.

Here, when the (second meandering amount dZ ₂ −first meandering amount dZ ₁ ) is given to the corrector 16, as shown in the corrector 16, when the maximum strip width steel strip is used, It is preferable to give upper and lower limit values in consideration of the meandering limit value in the first steering roll 1. Upper and lower limit values can be similarly given in the subsequent equipment, for example, the gain setter 30 for the second steering roll. When the value input to the gain setting value 30 is large enough to roll out on the downstream side, an alarm can be issued by the alarm device 31. This alarm can also be used to judge the abnormality of one of the meandering detectors. Further, when a correction value is given, a dead band can be set in the corrector 16 in order to ensure stability of control.

On the other hand, in the steering rolls 1 and 2, in order to correct and control the meandering, in addition to moving the axial position as shown in FIG. 2, as shown in FIG. It may be possible to swing the head to change the angle of intersection with the line center.

The gain and the upper and lower limit values in the compensator 16 and the gain setter 30 can be set by a host computer by setup depending on the width, thickness and material of the target steel strip. Further, in the present invention, the meandering correction point can be selected at an appropriate position on the downstream side of the second meandering detector 12. For example, when a facility that requires the centering of the steel strip is provided between the second meandering detector 12 and the second steering roll 2, the facility can be controlled as a meandering correction point.

[0024]

[Effect of device]

 As described above, according to the present invention, it is possible to improve the controllability of meandering, prevent the steel strip from meandering significantly, and prevent the helicopter extension due to the abrupt correction operation. Is brought about.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a control system of the present invention.

FIG. 2 is an explanatory diagram of an example of a movement mode of a steering roll.

FIG. 3 is an explanatory diagram of another example of a movement mode of a steering roll.

[Explanation of symbols]

1 ... 1st steering roll, 2 ... 2nd steering roll, 3 ... Cylinder, 11 ... 1st meandering detector, 12 ...
Second meandering detector, 13 ... Proportional-integral amplifier, 14 ... Proportional amplifier, 15 ... Comparator, 16 ... Corrector.

Claims (1)

[Scope of utility model registration request] 1. A device in which steering rolls are arranged at intervals in the running direction of a steel strip so as to be orthogonal to the lines, and the position of the steering rolls is adjusted to correct meandering. A meandering detector that is provided between the rolls at intervals in the running line direction to detect the center position or edge of the steel strip, and the meandering amount is calculated based on the output signals from both meandering detectors. And a meandering control device that controls the position of the steering roll on the upstream side to correct the meandering correction device.