JP2020164284A - Apparatus and method for controlling meander of steel plate - Google Patents

Abstract

To provide an apparatus and method for controlling meander of a steel plate that can inhibit a steel plate from meandering on a meander reference roll regardless of a distance between a position of the meander reference roll and a position of a meander detector even if a meander correction mechanism is one in the number.SOLUTION: An apparatus and method for controlling meander of a steel plate according to the present invention comprises a plurality of meander detectors that are set up along a transfer line for a steel plate and detect a meander amount of the steel plate, a meander correction mechanism that regulates a meander amount of the steel plate, and a control unit that determines a control amount of the meander correction mechanism based on detection values of the plurality of meander detectors and controls the meander correction mechanism according to a determined control amount. Incidentally, it is preferred that the control unit have one of the plurality of meander detectors as a master detector and the other meander detectors as slave detectors so as to correct the detection value of the master detector using a detection value of the slave detector.SELECTED DRAWING: Figure 1

Description

The present invention relates to a meandering control device for a steel sheet and a meandering control method.

In general, a steel sheet processing line is composed of an inlet section for discharging and welding the steel sheet, a central section for annealing, rolling, pickling and the like, and an outlet section for winding and cutting the steel sheet. Each section is provided with a roll for supporting the through plate, controlling tension, and the like, and the steel plate passes over the roll and goes through a series of steps from the entry side section to the exit side section. This process is called a plate.

The steel plate may deviate from the center position of the roll in the width direction during passing due to factors such as the wear of the roll and the shape of the steel plate. This phenomenon is called meandering. If the meandering amount of the steel sheet becomes large, there is a possibility that the peripheral equipment may be damaged due to contact with the steel sheet or the steel sheet may be broken due to a sudden change in tension, and there is a concern about a large production loss. Against this background, techniques related to meandering control have been proposed for some time. In the following, since meandering becomes a problem, a roll that "wants to pass through the center" is referred to as a meandering reference roll.

A CPC (Center Position Control) device is known as a general meandering control device, and the CPC device includes a meandering detector and a meandering correction mechanism (hereinafter, also referred to as a steering roll). Examples of the meandering detector include a pair of a floodlight and a receiver and an AWC (Automatic Width Control), and examples of the meandering correction mechanism include a roll tilting mechanism. The meandering detector detects the position of the steel sheet in the width direction, and the controller calculates the deviation between the detected value of the meandering detector and the target position, and controls the meandering correction mechanism so that the deviation becomes smaller.

In the CPC device, the longer the distance between the installation position of the meandering detector and the position of the meandering reference roll, the more meandering occurs between them, and the deviation of the position in the width direction of the steel sheet from the target position at the position of the meandering reference roll becomes larger. growing. Therefore, in Patent Document 1, in response to the phenomenon that the meandering amount of the steel plate becomes larger toward the downstream side for a plurality of adjacent steering rolls, the output of the plurality of meandering detectors and the inclination of the plurality of steering rolls are used to be upstream. It describes how to correct the tilt of the steering roll. Further, Patent Document 2 describes a method of providing one meandering detector before and after the meandering reference roll and estimating the meandering amount from the average of them.

Japanese Patent Application Laid-Open No. 5-208763 JP-A-7-267444

However, in the method described in Patent Document 1, since the upstream steering roll is operated to control the downstream steering roll, there is a case where there is only one set of steering rolls, or a mechanism for forming a tension step between the steering rolls ( It is not effective when there is a bridle roll, etc.). Further, if even one meandering detector fails, there is a problem that the operation of the downstream steering roll is affected. On the other hand, the method described in Patent Document 2 is not applicable when there is no space for providing a meandering detector on the downstream side of the meandering reference roll, and the meandering detector is one as in the method described in Patent Document 1. If any failure occurs, meandering control becomes difficult.

The present invention has been made in view of the above problems, and an object of the present invention is regardless of the distance between the position of the meandering reference roll and the position of the meandering detector even when there is only one meandering correction mechanism. It is an object of the present invention to provide a meandering control device and a meandering control method for a steel plate capable of suppressing meandering of a steel plate on a meandering reference roll.

The meandering control device for a steel sheet according to the present invention includes a plurality of meandering detectors for detecting the meandering amount of the steel sheet, a meandering correction mechanism for adjusting the meandering amount of the steel sheet, and the plurality of meandering detectors installed along the transport line of the steel sheet. A control device for determining a control amount of the meandering correction mechanism based on the detection value of the meandering detector and controlling the meandering correction mechanism according to the determined control amount is provided.

In the above invention, the meandering control device for a steel plate according to the present invention is a slave detector in which one of the plurality of meandering detectors is a master detector and the other meandering detector is a slave detector. It is characterized in that the detection value of the master detector is corrected by using the detection value of.

The meandering control device for a steel plate according to the present invention is characterized in that, in the above invention, the control device monitors a failure of a plurality of meandering detectors based on the detection value of each meandering detector.

In the above invention, the meandering control device for a steel plate according to the present invention determines the control amount of the meandering correction mechanism without using the detection value of the meandering detector determined to be out of order. It is a feature.

The meandering control method for a steel sheet according to the present invention is based on a step of detecting a meandering amount of a steel sheet using a plurality of meandering detectors installed along a transport line of the steel sheet and a detection value of the plurality of meandering detectors. A step of determining a control amount of the meandering correction mechanism for adjusting the meandering amount of the steel sheet and controlling the meandering correction mechanism according to the determined control amount is included.

According to the meandering control device and the meandering control method for a steel sheet according to the present invention, the meandering reference roll does not depend on the distance between the position of the meandering reference roll and the position of the meandering detector even when there is only one meandering correction mechanism. It is possible to suppress the meandering of the steel plate above.

FIG. 1 is a schematic view showing a configuration of a meandering control device for a steel plate according to an embodiment of the present invention. FIG. 2 is a plan view for explaining a meandering control process according to an embodiment of the present invention.

Hereinafter, the configuration and operation of the meandering control device for the steel plate according to the embodiment of the present invention will be described with reference to the drawings.

〔Constitution〕
First, the configuration of the meandering control device for a steel plate, which is an embodiment of the present invention, will be described with reference to FIG.

FIG. 1 is a schematic view showing a configuration of a meandering control device for a steel plate according to an embodiment of the present invention. As shown in FIG. 1, the meandering control device 1 for a steel sheet according to an embodiment of the present invention is a device for suppressing the meandering of the steel sheet S on the meandering reference roll 2, and is along the conveying direction of the steel sheet S. It is provided with a plurality of (n units) meandering detectors 11 _{1 to} 11 _n , a steering roll 12, and a control device 13.

The plurality of meandering detectors 11 _{1 to} 11 _n detect the meandering amount of the steel plate S at the installation position, and output an electric signal indicating the detected meandering amount to the control device 13.

The steering roll 12 functions as a meandering correction mechanism according to the present invention, and adjusts the meandering amount of the steel plate S.

The control device 13 is composed of an information processing device such as a computer, and performs a meandering control process described later based on the meandering amount of the steel plate S detected by a plurality of meandering detectors 11 _{1 to} 11 _n to obtain a meandering reference. The steering roll 12 is controlled so that the meandering amount of the steel plate S on the roll 2 becomes zero.

[Meander control process]
Next, the operation of the meandering control device 1 of the steel plate when executing the meandering control process will be described. In the following description, n represents the number of installed meander detector, i is 1 ≦ i integer satisfying ≦ n, m is meandering detector numbers the master (for the main control), L _i is meandering detector The distance between the installation position of i and the position of the meandering reference roll 2, x _i is the amount of meandering of the steel plate S detected by the meandering detector i, and x _{i, m, r} are meandering detection based on the meandering detector i. meandering amount of the steel sheet S from the vessel m is expected to occur until the meandering reference roll 2, w _i is meandering detector i (≠ m) by the prediction meandering amount x _{i, m,} weighting factor _r, a _i is meandering detection Arbitrary values for determining the weighting coefficient w _i for the vessel i (≠ m), x _{m, r} are the meandering amount of the steel plate S predicted to occur from the meandering detector m to the meandering reference roll 2, and _cm is The predicted meandering amount x m in the meandering detector _m, a coefficient representing the degree of correction by _r , x _mt is the target position of the steel plate S in the meandering detector m, x _rt is the target position of the steel plate S in the meandering reference roll 2, and f is Indicates a subscript indicating that the meandering detector is out of order.

In the meandering control process of the present embodiment, the meandering control device 1 of the steel sheet detects meandering in advance with respect to the meandering of the steel sheet S which is predicted to occur between the installation position of the meandering detector m and the position of the meandering reference roll 2. By shifting the target position of the steel plate S on the vessel m, the position of the steel plate S on the meandering reference roll 2 is set as the target. Specifically, first, the control device 13 is a steel plate S that is predicted to be generated from the installation position of the meandering detector m to the position of the meandering reference roll 2 with respect to the meandering detector i for an arbitrary number i. The meandering amount (predicted meandering amount) x _{i, m, r} is calculated. For more information, meandering amount generated between the installation position of the installation position and the meander detector m meandering detector i is (x m _{-x i)} and represented, meandering detector i installation position and meandering detector m since the distance between the installation position of the represented as _(L m -L _i), the amount of meandering of the steel sheet S per unit distance is represented as _{(x m -x i) / (} L m -L i) Meander. Therefore, the meandering amounts x _{i, m, and r} of the steel plate S can be calculated by the following mathematical formula (1).

However, it is considered that the error of the predicted meandering amount becomes larger as the installation position of the meandering detector m is farther from the installation position of the master meandering detector m. Therefore, the control device 13 has the predicted meandering by each meandering detector. the amount _{x i, m,} and substantial prediction meandering amount value multiplied by a weighting factor _{w i} (see FIG. _{2) w i × x i,} m, and _r to _r. Incidentally, the weight coefficient w _i is represented as the equation (2) below by using the setting parameters a _i with respect to meander detector i. In FIG. 2, reference numeral P1 indicates the center position of the steel plate S in the width direction, and reference numeral P2 indicates the target position of the steel plate S on the meandering reference roll 2.

Next, the control device 13 calculates the total predicted meandering amount x _{m, r} from the substantial predicted meandering amount of each meandering detector using the mathematical formula (3) shown below.

Next, the control device 13 sets the correction coefficient added to the predicted meandering amount of the master meandering detector m to C _m, and uses the target position x _rt of the steel plate S on the meandering reference roll 2 to show the following mathematical formula (4). ), The target position x _mt of the steel plate S in the meandering detector m is calculated. Then, the control device 13 controls the position of the steel plate S on the meandering detector m to the target position x _mt by controlling the steering roll 12 to control the position of the steel plate S on the meandering reference roll 2 to the target position. To do.

As is clear from the above description, in the meandering control process of the present embodiment, the control device 13 determines the control amount of the steering roll 12 based on the detected values of the plurality of meandering detectors 11 _{1 to} 11 _n , and determines the control amount. Since the steering roll 12 is controlled according to the controlled amount, even if there is only one steering roll 12, the meandering reference roll 2 is on the meandering reference roll 2 regardless of the distance between the position of the meandering reference roll 2 and the position of the meandering detector. The meandering of the steel plate S can be suppressed.

It is desirable to mutually monitor the detected values of a plurality of meandering detectors 11 _{1 to} 11 _n and use the meandering detector having an abnormal detected value as a failure detector. Specifically, a threshold value d was set for the detected value, and x _i −x _j ≦ d, x _j −x _k ≧ d, and x _k −x _i ≧ d for arbitrary numbers i, j, and k. In this case, it can be seen that the detected value x _k is abnormal as compared with other detected values. Therefore, in this case, it can be determined that the meandering detector k is out of order. However, the threshold value for failure determination and the number of meandering detectors used as failure determination criteria are not necessarily the same as the examples.

Further, the target position x _mt of the steel plate S in the master meandering detector m may cause a large error when there is a failed meandering detector. Therefore, the meandering detector found to be out of order by the above-mentioned failure determination or the like can be automatically or manually removed from the correction as shown in the following mathematical formula (5) to reduce the error. .. However, in the mathematical formula (5), xi _{, m, r, and f} indicate the meandering amount of the steel plate S detected by the failed meandering detector.

Although the embodiment to which the invention made by the present inventor is applied has been described above, the present invention is not limited by the description and the drawings which form a part of the disclosure of the present invention according to the present embodiment. That is, other embodiments, examples, operational techniques, and the like made by those skilled in the art based on the present embodiment are all included in the scope of the present invention.

1 Meander control device for steel plate 2 Meander reference roll 11 _{1 to} 11 _n Meander detector 12 Steering roll 13 Control device S Steel plate

Claims (5)

Multiple meandering detectors installed along the steel sheet transport line to detect the amount of meandering of the steel sheet,
A meandering correction mechanism that adjusts the amount of meandering of the steel sheet,
A control device that determines a control amount of the meandering correction mechanism based on the detection values of the plurality of meandering detectors and controls the meandering correction mechanism according to the determined control amount.
A meandering control device for a steel plate, which comprises. In the control device, one of the plurality of meandering detectors is a master detector, and the other meandering detector is a slave detector, and the detection value of the master detector is corrected by using the detection value of the slave detector. The meandering control device for a steel plate according to claim 1. The meandering control device for a steel plate according to claim 1 or 2, wherein the control device monitors a failure of a plurality of meandering detectors based on a detection value of each meandering detector. The meandering control device for a steel plate according to claim 3, wherein the control device determines a control amount of the meandering correction mechanism without using a detection value of a meandering detector determined to be out of order. A step of detecting the amount of meandering of a steel sheet using a plurality of meandering detectors installed along the transfer line of the steel sheet,
A step of determining a control amount of a meandering correction mechanism that adjusts the meandering amount of the steel sheet based on the detection values of the plurality of meandering detectors, and controlling the meandering correction mechanism according to the determined control amount.
A method for controlling meandering of a steel sheet, which comprises.

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