Method for controlling micro-tension of hot strip rolling looper

Abstract

The invention relates to a method for controlling micro-tension of a hot strip rolling looper, which aims at improving the quality of hot rolled products and the finished product rate of hot rolling. The method is applicable to automatically controlling a finishing rolling hydraulic looper on a hot strip mill, when a strip steel is completely snapped by adjacent two finishing mill stands of the looper, a control system calculates the looper tension torque proportionality coefficient according to the following formula: Kp is equal to (absolute value of (delta Mact multiplied by (1 minus et / T) divided by Mref) multiplied by K1 plus K2 plus 1) multiplied by C, wherein delta Mact is the actual torque variable quantity; Mref is the set torque; K1 is the deviation amplification proportionality coefficient; K2 is the anti-resonance proportionality coefficient; C is a control constant; t is filtering time with the unit being s; T is sampling time with the unit being s; and the control system cuts off the calculation of the micro-tension coefficient of the looper through the tracking calculation of the tail part of the strip steel when the tail part of a front stand of the adjacent stand turns to the small looper at 5 seconds before throwing steel, turns to the constant micro-tension torque calculation and finally determines the final looper position for controlling and setting.

Description

Technical field [0001] The invention relates to an automatic control method for a hot-rolled strip finish rolling looper. Background technique [0002] The looper control of the hot rolling mill is an important part of the automatic control system of the hot rolling mill: the looper is installed between the two finishing stands to control the tension between the two stands to avoid excessive tension. If the tension is too large, it will lead to narrowing or rolling, or if the tension is too small, stable rolling will not be formed. The looper control interacts with the main drive speed of the finishing mill, and it is also affected by factors such as the AGC under pressure, strip tension, looper position, and tension moment. It can be said that the looper control process is a comprehensive reflection of various factors; The frequent adjustment of the looper itself will cause the instability of many factors in the finishing mill, which will easily cause scrap steel and affec...

AI Technical Summary

Problems solved by technology

The looper control interacts with the main transmission speed of the finishing mill, and it is also affected by factors such as the AGC under pressure, strip tension, looper position, and tension moment. It can be said that the looper control process is a comprehensive reflection of various factors; The frequent adjustment of the looper itself will cause the instability of many factors in the finishing mill, which will easily cause scrap steel and affect product quality.