Method for improving cold rolling mill thickness control performance using feedforward network

Abstract

The invention provides a method for utilizing a feed-forward network to improve the control performance of the thickness of cold rolling mills, which uses an entrance thickness tester, an Ethernet, a controller and a hydraulic screwdown gear as the thickness control device, adds an Ethernet communication interface for the entrance thickness tester, and then transfers the thickness data through a simulation channel and a digital communication network.. The invention is characterized in that: the controller receives the data of two transmission methods; when the simulation channel fails, the data of the network interface are used as the feedforward value; the controller calculates based on the feedforward value and outputs the controlled variable for the servo valve of the hydraulic screwdown gear to control, thus completing the calculation process of the controller. The invention utilizes the redundancy feedforward Ethernet, and changes the single simulation value transmission of the feedforward channel into the dual-transmission method of simulation value and digital network. The invention has the advantages that: the continuous running time of the system is prolonged; the failure diagnosing and handling of the transmission channel are realized, and the performance of the thickness control system of the cold rolling mills is improved.

Description

technical field [0001] The invention relates to a method for improving the thickness control performance of a cold rolling mill by using a feedforward network, and belongs to the technical field of cold rolling mill control. Background technique [0002] In the metallurgical industry, the metal pressure processing equipment cold rolling mill is composed of a variety of equipment, the process flow is relatively complicated, and the computer control level is high, and the automatic control system plays an important role in it. The automation control system of cold rolling mill can be divided into basic automation system and process automation system. For the basic automation system, the thickness control system is a key component and a key means to ensure the thickness accuracy of the rolled strip outlet. When the thickness control system of the cold rolling mill uses the feedback control method, the thickness is measured from the exit of the strip, which inevitably produces ...

AI Technical Summary

Problems solved by technology

This way of connecting the feedforward channel with a separate analog quantity, because the analog voltage or current is greatly affected by the surrounding environment, the change of the electromagnetic field in the surrounding environment is likely to cause the change of the analog voltage or current, the anti-interference ability is weak, and the possibility of failure is relatively low. high

When the analog channel fails, it often causes errors or failures in the control system, causing the performance of the control system to degrade or even stop running.

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