Method for correcting second flow mismatching between hot continuous rolling racks

Abstract

The invention provides a method for correcting second flow mismatching between hot continuous rolling racks, and belongs to the technical field of hot continuous rolling automatic control. The method comprises the following steps that firstly, the adjusting amount of a height closed loop after a loop is lifted and enters the height closed loop in the finish rolling strip penetrating process is collected, and meanwhile, a deviation value between an actual loop lifting angle and a set angle in the process is collected; a proper learning coefficient is determined through the angle deviation value; and before strip penetrating of a finishing mill group next time, the strip penetrating speed set for a secondary model is corrected through the accumulated learning amount, and cascading correction is carried out on the strip penetrating speed of the upstream rack according to a principle that flow per second is equal. Through practical application on multiple sites, the method can well solve the product quality problem caused by the non-ideal loop lifting angle of the loop.

Description

technical field [0001] The invention relates to the technical field of automatic control of hot continuous rolling, in particular to a method for correcting the mismatch of second flow rates between hot continuous rolling stands. Background technique [0002] In the hot continuous rolling production line, the looper control plays a key role, directly related to the quality of the product; the looper device is installed between the finishing rolling stands to buffer the change of the metal second flow, and the looper is guaranteed by the tension closed-loop control hydraulic servo system. The tension of the looper is constant, and at the same time, the speed of the upstream frame is adjusted through a closed-loop height to ensure a constant amount of looping; when the setting accuracy of the secondary model deviates, there will be a deviation in the setting of the second flow rate between the racks, and the second flow rate between the racks The deviation will cause the angle...

AI Technical Summary

Problems solved by technology

[0002] In the hot continuous rolling production line, the looper control plays a key role, directly related to the quality of the product; the looper device is installed between the finishing rolling stands to buffer the change of the metal second flow, and the looper is guaranteed by the tension closed-loop control hydraulic servo system. The tension of the looper is constant, and at the same time, the speed of the upstream frame is adjusted through a closed-loop height to ensure a constant amount of looping; when the setting accuracy of the secondary model deviates, there will be a deviation in the setting of the second flow rate between the racks, and the second flow rate between the racks The deviation will cause the angle of the looper to fail to fully reach the set angle; when the angle of the looper is high, in order to ensure the second flow matching between the racks, the closed loop of the looper height intervenes and the upstream rack starts to decelerate, and the upstream machine During the deceleration process of the frame, the tension of the loop will be over-adjusted. Since the servo valve cannot be quickly retracted, there will be a phenomenon of steel pulling during the process; The frame starts to accelerate, and since the current set tension is greater than the set tension at the current angle, the strip steel will also be in the steel pulling state during the time period when the looper continues to unwind to the set angle; when the looper angle overshoots In serious cases, there will be stacking of strip steel between racks, which will affect the width and thickness of strip steel, and in serious cases, there will be accidents of stacked scrap steel;

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