Hot continuous rolling special steel main drive overload control method

Abstract

The invention discloses a hot continuous rolling special steel main drive overload control method, and belongs to the field of automatic control over hot continuous rolling finishing mill group main drive. The method includes the steps that (1) the power-down setting value of an AC-AC system is 2.25*Ie, the power-down setting value of an AC-DC-AC system is 1.75*Ie, and the Ie refers to the rated current of a rack main drive system; and a main drive overload setting value is 80%-90% of the power-down setting value; and (2) when the rack overload duration reaches 2-4s, overload signals are sent to a primary computer, a deceleration control algorithm is adopted by the primary computer for automatic deceleration control of a finishing mill group until the rack overload signals are canceled, and the control mode is reset to conventional main drive control. By means of the hot continuous rolling special steel main drive overload control method, the main drive overload power-down failure on the tail portion of finish rolling strip steel is eliminated, the fault time of equipment is shortened, production efficiency is improved, and good benefits are obtained.

Description

technical field [0001] The invention belongs to the field of automatic control of the main drive of hot continuous rolling and finishing mills, and is mainly used for strip steel with high rolling load and high rolling speed, including nickel stainless steel, silicon steel and high-strength steel. Background technique [0002] The main drive system of the finishing stand is divided into AC system and AC DC system. Different systems have different overload setting values ​​and different power-off setting values. [0003] With the increase in the weight of the special steel billet and the increase in rolling speed caused by thinning, the current of the 7 stands (F0-F6) of the main drive of the finishing rolling unit is also becoming larger and larger, especially when the main The drive system is overloaded and powered off. [0004] Due to the need to ensure the exit temperature of the strip finish rolling, the rolling speed of the finish rolling unit needs to be continuously ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of overloading of the tail rack of the strip steel without power-off scrap steel, so as to ensure that there is no scrap steel between the racks during the production of special steel varieties, and to ensure the stable control of hot rolling production