JP7115391B2 - Meandering control device for steel plate and meandering control method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a meandering control device and a meandering control method for a steel plate.

Generally, a steel sheet processing line is composed of an entry section for unloading, welding, etc. of the steel sheet, a central section for annealing, rolling, pickling, etc., and an exit section for winding and cutting the steel sheet. Each section is equipped with rolls to support the threading and to control tension, etc., and the steel sheets pass over the rolls and go through a series of processes from the entry side section to the exit side section. This process is called board threading.

The steel sheet may be displaced in the width direction from the center position of the roll during threading due to factors such as wear of the roll and the shape of the steel sheet. This phenomenon is called meandering. If the amount of meandering of the steel plate increases, there is a possibility that peripheral equipment will be damaged due to contact with the steel plate, or that the steel plate will break due to sudden changes in tension, resulting in a large production loss. Against this background, techniques related to meandering control have been proposed in the past. In the following description, meandering becomes a problem, so the roll that "is desired to be threaded at 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 light emitter and a light receiver, AWC (Automatic Width Control), etc., and examples of the meandering correction mechanism include a roll tilting mechanism. The meandering detector detects the widthwise position of the steel plate, the controller calculates the deviation between the detected value of the meandering detector and the target position, and controls the meandering correction mechanism so as to reduce the deviation.

In the CPC apparatus, 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 width direction position of the steel sheet from the target position at the position of the meandering reference roll. growing. For this reason, in Patent Document 1, regarding a plurality of adjacent steering rolls, in response to the phenomenon that the amount of meandering of the steel plate increases toward the downstream side, the output of the plurality of meandering detectors and the inclination of the plurality of steering rolls are used to detect the upstream side. A method for correcting the tilt of the steering roll is described. Further, Patent Literature 2 describes a method of estimating a meandering amount from an average of meandering detectors provided in front of and behind a meandering reference roll.

JP-A-5-208763 JP-A-7-267444

However, in the method described in Patent Document 1, the upstream steering roll is operated to control the downstream steering roll. bridle rolls, etc.) are not valid. 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 cannot be applied when there is no space for installing a meandering detector on the downstream side of the meandering reference roll. If any one of them fails, meandering control becomes difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to solve the above problem 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.

A steel plate meandering control device according to the present invention includes: a plurality of meandering detectors installed along a steel plate conveying line for detecting the meandering amount of a steel plate; a meandering correction mechanism for adjusting the meandering amount of the steel plate; a control device that determines a control amount for the meandering correction mechanism based on the detected value of the meandering detector, and controls the meandering correction mechanism according to the determined control amount.

The steel plate meandering control device according to the present invention is the above-described invention, wherein one of the plurality of meandering detectors is a master detector, and the other meandering detectors are slave detectors. is used to correct the detection value of the master detector.

A steel plate meandering control apparatus according to the present invention is characterized in that, in the above invention, the control apparatus monitors failures of a plurality of meandering detectors based on detection values of the respective meandering detectors.

The steel plate meandering control device according to the present invention is the above invention, wherein the control device determines the control amount of the meandering correction mechanism without using the detection value of the meandering detector determined to be malfunctioning. Characterized by

A steel sheet meandering control method according to the present invention comprises the steps of detecting the amount of meandering of a steel sheet using a plurality of meandering detectors installed along a steel sheet conveying line; determining a control amount of a meandering correction mechanism for adjusting the meandering amount of the steel plate, and controlling the meandering correction mechanism according to the determined control amount.

According to the meandering control apparatus and meandering control method for a steel sheet according to the present invention, even if there is only one meandering correcting mechanism, the meandering reference roll can be corrected regardless of the distance between the position of the meandering reference roll and the position of the meandering detector. It is possible to suppress the meandering of the steel plate above.

FIG. 1 is a schematic diagram showing the configuration of a steel plate meandering control apparatus according to an embodiment of the present invention. FIG. 2 is a plan view for explaining meandering control processing, which is an embodiment of the present invention.

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

〔Constitution〕
First, referring to FIG. 1, the configuration of a steel plate meandering control apparatus according to an embodiment of the present invention will be described.

FIG. 1 is a schematic diagram showing the configuration of a steel plate meandering control apparatus according to an embodiment of the present invention. As shown in FIG. 1, a steel plate meandering control device 1 according to an embodiment of the present invention is a device for suppressing meandering of a steel plate S on a meandering reference roll 2. A plurality (n units) of meandering detectors 11 ₁ to 11 _n , a steering roll 12, and a control device 13 are provided.

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 amount of meandering of the steel plate S.

The control device 13 is configured by an information processing device such as a computer, and executes a meandering control process, which will be described later, based on the meandering amount of the steel plate S detected by the plurality of meandering detectors 11 ₁ to 11 _n , thereby determining the meandering reference. The steering roll 12 is controlled so that the meandering amount of the steel plate S on the roll 2 becomes zero.

[Meandering control process]
Next, the operation of the steel plate meandering control apparatus 1 when executing the meandering control process will be described. In the following description, n is the number of installed meandering detectors, _i is an integer satisfying 1≤i≤n, m is the number of the meandering detector that serves as the master (for main control), and Li is the meandering detector. The distance between the installation position of i and the position of the meandering reference roll 2, _xi is the meandering amount of the steel sheet S detected by the meandering detector i, and _{xi, m, and r} meandering detection with the meandering detector i as a reference. The meandering amount of the steel sheet S predicted to occur from the machine m to the meandering reference roll 2, wi is the weighting factor of the predicted meandering amounts xi _{, m, and r} by the meandering detector _i (≠m), and _ai is the meandering detection. An arbitrary value for determining the weighting factor wi for the device _i (≠m), xm _{, r} is the meandering amount of the steel sheet S predicted to occur from the meandering detector m to the meandering reference roll 2, and _cm is A coefficient representing the degree of correction by the predicted meandering amount xm _,r in the meandering detector m, _{xmt is the target position of the steel plate S in the meandering detector m, xrt is} the target position of the steel plate S in the meandering reference roll 2, and f is A subscript indicates that the meander detector has failed.

In the meandering control process of the present embodiment, the steel plate meandering control device 1 detects meandering in advance for the meandering of the steel plate S that 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 device m, the position of the steel plate S on the meandering reference roll 2 is set as the target. Specifically, first, for an arbitrary number i, the control device 13 uses the meandering detector i as a reference, and determines the number of steel sheets S predicted to occur from the installation position of the meandering detector m to the position of the meandering reference roll 2. A meandering amount (predicted meandering amount) x _{i, m, r} is calculated. Specifically, the amount of meandering that occurs between the installation position of meandering detector i and the installation position of meandering detector m is expressed as (x _m −x _i ). is expressed as (L _m −L _i ), the amount of meandering of the steel plate S per unit distance is expressed as (x _m −x _i )/(L _m −L _i ). be. Therefore, the meandering amounts x _{i, m, and r} of the steel sheet S can be calculated by the following formula (1).

However, it is conceivable that the error in the predicted meandering amount of a meandering detector that is farther from the position of installation of meandering detector m, which is the master, will increase. A value w _i ×x _i,m,r obtained by multiplying the amount x _i,m,r by a weighting factor w _i (see FIG. 2) is set as a substantial predicted meandering amount. It should be noted that the weighting factor wi is represented by the following equation (2) using a parameter _ai that can be set for the meandering detector _i . In FIG. 2 , symbol P1 indicates the center position of the steel sheet S in the width direction, and symbol P2 indicates the target position of the steel sheet S on the meandering reference roll 2 .

Next, the control device 13 calculates a comprehensive predicted meandering amount xm _,r from the substantially predicted meandering amount of each meandering detector using the following formula (3).

Next, the control device 13 sets Cm as a correction coefficient to be added to the predicted meandering amount of the master meandering detector _m , and uses the target position _xrt of the steel sheet S on the meandering reference roll 2 to obtain the following 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 _xmt by controlling the steering roll 12, thereby controlling the position of the steel plate S on the meandering reference roll 2 to the target position. 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 detection values of the plurality of meandering detectors 11 ₁ to 11 _n . Since the steering roll 12 is controlled according to the control amount, even if there is only one steering roll 12, the steering roll 12 can be controlled 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. Meandering of the steel plate S can be suppressed.

It is desirable that the detection values of the plurality of meandering detectors 11 ₁ to 11 _n are mutually monitored, and the meandering detector whose detected value is abnormal is regarded as the failure detector. Specifically, a threshold value d is 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 , it can be seen that the detected value x _k is abnormal compared to other detected values. Therefore, in this case, it can be determined that the meandering detector k is out of order. However, the threshold for failure determination and the number of meandering detectors serving as failure determination criteria are not necessarily the same as in the example.

Also, the target position _xmt of the steel plate S in the meandering detector m of the master may produce a large error when there is a malfunctioning meandering detector. For this reason, it is possible to reduce the error by automatically or manually excluding the meandering detector that has been found to be out of order by the above-mentioned failure determination or the like from the correction as shown in the following formula (5). . However, in Expression (5), _{xi, m, r, and f} represent the amount of meandering of the steel sheet S detected by the faulty meandering detector.

Although the embodiments to which the invention made by the present inventor is applied have been described above, the present invention is not limited by the descriptions and drawings forming a part of the disclosure of the present invention according to the embodiments. That is, other embodiments, examples, operation techniques, etc. made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

1 meandering control device for steel plate 2 meandering reference roll 11 ₁ to 11 _n meandering detector 12 steering roll 13 control device S steel plate

Claims (4)

a plurality of meandering detectors for detecting the meandering amount of the steel plate, which are installed along the conveying line of the steel plate;
a meandering correction mechanism for adjusting the meandering amount of the steel plate;
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 ;
The control device uses one of the plurality of meandering detectors as a master detector and the other meandering detectors as slave detectors, and corrects the detected value of the master detector using the detected value of the slave detector.
A steel plate meandering control device characterized by: 2. The steel plate meandering control device according to claim 1 , wherein the controller monitors failures of a plurality of meandering detectors based on detection values of the respective meandering detectors. 3. A meandering control apparatus for a steel plate according to claim 2 , wherein said controller determines the control amount of said meandering correction mechanism without using the detected value of said meandering detector determined to be malfunctioning. A step of detecting the amount of meandering of the steel plate using a plurality of meandering detectors installed along the conveying line of the steel plate;
determining a control amount of a meandering correction mechanism that adjusts the meandering amount of the steel plate based on the detection values of the plurality of meandering detectors, and controlling the meandering correction mechanism according to the determined control amount ;
The step of controlling the meandering correction mechanism includes setting one of the plurality of meandering detectors as a master detector and the other meandering detectors as slave detectors, and using detection values of the slave detectors to correct the master detector. Including the step of correcting the detected value
A meandering control method for a steel plate, characterized by:

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