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

Abstract

The invention provides a method for improving the thickness control performance of a cold rolling mill by using a feedback network, using an outlet thickness gauge, an Ethernet, a controller and a hydraulic pressing device as the thickness control equipment. The export thickness gauge is equipped with an Ethernet communication interface, and the thickness data is transmitted through the analog channel and the digital communication network at the same time; the controller receives the data of the two transmission methods, and if the analog channel fails, the data of the network interface is used as the feedback value; the controller Calculate according to the feedback value, output the control amount to the servo valve of the hydraulic pressing device for control, and complete the calculation process of the control loop. The present invention uses redundant feedback Ethernet to change the feedback channel from a separate analog transmission to a simultaneous transmission of analog and digital networks, prolonging the continuous running time of the system, realizing fault diagnosis and processing of the transmission channel, and improving The performance of thickness control system of cold rolling mill is studied.

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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