AGC control method with gain subsection control for thickness of hot continuous rolling

Abstract

The invention discloses a hot continuous rolling thickness AGC control method having gain segmentation control. The control method is performed through a computer system and an AGC system connected with a thickness gauge, and comprises the steps of: detecting a head thickness signal through the thickness gauge; starting AGC when the head operation is delayed for n seconds; detecting the thickness deviation in real time through a sensor; judging the thickness deviation range; taking different gain coefficients KP according to the thickness deviation quantity within m seconds; taking different gain coefficients KP according to another set of thickness deviation division section after m seconds; calculating the roller gap adjusting quantity through a calculating module and a digital simulating module; outputting the back frame roller gap adjusting quantity to an amplitude limiting acceleration generator; and controlling the generated roller gap adjusting quantity through the closed loop feedback of the AGC system, and sending the roller gap adjusting quantity to a position adjuster to finish the roller gap adjustment so as to control the thickness in real time. The control method can thermally realize the layering and segmentation dynamic gain control of continuous rolling and finish rolling thickness feedback to reduce the thickness deviation and fluctuation.

Description

technical field [0001] The invention relates to a method for controlling the production of hot-rolled strip steel, in particular to an automatic feedback control method for the thickness of a hot continuous rolling mill. Background technique [0002] Strip thickness control system occupies a very important position in the whole production process, the quality of the control directly affects the quality and pass rate of finished products. In general, the thickness control of hot-rolled strip steel is mainly realized in the finishing rolling process, and the thickness automatic control means of finishing rolling is a powerful tool to realize thickness precision control. Among them, the thickness feedback control is the key to ensure the thickness control of the strip steel. [0003] The principle of thickness feedback control is: an X-ray thickness gauge is installed at the exit of the finishing mill, and the thickness deviation detected by the exit thickness gauge of the fin...

AI Technical Summary

Problems solved by technology

[0022] Situation 4: The adjustment direction is correct, but the small adjustment amount cannot guarantee the thickness control after 1s at all

[0023] To sum up, under the current control conditions, setting the thickness feedback start time early or late cannot guarantee reasonable thickness control in various situations.

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