Method for controlling position of pinch roll at finish rolling inlet of hot continuous rolling device

Abstract

The invention relates to a method for controlling position of a pinch roll at a finish rolling inlet of a hot continuous rolling device. The method comprises deciding to adopt a linear control method and a non-linear control method according to different position deviations at two sides of a pinch roll during pinch roll gap control, determining an entry switching point between linear control and non-linear control according to the curvature of a curve in the non-linear control process and the straight slop in the linear control process through combination of linear control and non-linear control, to precisely control position deviations, and implementing uninterrupted high precision position control according to combination of characteristics of the two control methods during control to meet demands of the whole automatic positioning control. By adopting the method for controlling the position of the pinch roll at the finish rolling inlet of the hot continuous rolling device, the problem that the efficiency of a manual control method and the control precision are low can be solved.

Description

technical field [0001] The invention relates to the automatic control of steel rolling, in particular to the control of the pinch roll at the entrance of finish rolling of hot continuous rolling mill, and in particular to a position control method of pinch roll at the entrance of finish rolling of hot continuous rolling mill. Background technique [0002] In order to ensure the normal bite of the steel strip in the hot tandem rolling mill, a pinch roll is installed in front of the hot tandem rolling mill. Its main function is to assist the normal bite of the strip steel into the rolling mill, such as figure 1 shown. In the structure of the pinch roll, its upper roll is fixed and is in contact with the strip steel, and it always rotates during rolling at the same speed as the strip steel, the lower roll is movable up and down, and the operation of the pinch roll There are two hydraulic cylinders on the driving side and the driving side respectively. The pinch roller is drive...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method for controlling the position of the pinch roll at the entrance of the finishing rolling of a hot continuous rolling mill. Control speed and control precision to meet the requirements of on-site production, to solve the problems of low efficiency and poor control precision of manual control methods

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