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

Abstract

The invention provides a method for utilizing a feedback network to improve the control performance of the thickness of cold rolling mills, which uses an exit thickness tester, an Ethernet, a controller and a hydraulic screwdown gear as the thickness control device, adds an Ethernet communication interface for the exit thickness tester, and simultaneously 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 feedback value; the controller calculates based on the feedback 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 feedback Ethernet, and changes the single simulation value transmission of the feedback 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 feedback 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. The thickness control system of the cold rolling mill measures the exit thickness of the rolled strip through a thickness gauge, and compares the actual measured value with the...

AI Technical Summary

Problems solved by technology

This method of connecting a separate analog quantity to the feedback control loop, 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 the error or failure of the control loop, which makes the performance of the control system degrade or even stop running.

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