Highly automatic control method of special steel looper of trouble rolling mill

Abstract

The invention relates to a highly automatic control method of a special steel looper of a fault rolling mill, which is suitable for controlling a hot rolling strip steel finishing mill and aims to solve the problem of strip band surface scratch caused by fault looper equipment of the rolling mill when waiting for a position. The highly automatic control method comprises the following steps: when a strip steel rolling force load value of a downstream rack adjacent to the fault rolling mill is greater than a target value, determining the downstream rack to bite steel; controlling a corresponding looper of the downstream rack by rising up the looper and according to a computational formula Y=K*100% given according to the looper height of the fault rolling mill, wherein Y is a servo valve additional set value of the looper height of the fault rolling mill, K is a set value and is generally between 0 and 1, and the maximal amplitude limit of the servo valve additional set value is 100 percent; determining the servo valve additional set value of the corresponding looper height of the fault rolling mill, and controlling a looper angle between rolling mills to be larger than 15 DEG, thereby practical looper height is controlled below a rolling centre line so as to meet the technological requirement of strip band surface quality.

Description

Technical field [0001] The invention relates to a control method of a hot-rolled strip finishing looper. Background technique [0002] In the hot continuous rolling finishing area, if the mechanical or electrical failure of a rolling mill occurs, the looper position is usually at a waiting position lower than the rolling center line. If no control is carried out, when the strip passes through the looper When the roller and its transition plate are damaged, it will cause scratches on the surface of the strip and affect the quality of the product, especially for special steel such as stainless steel. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and provide an automatic control method for the height of the special steel looper of the faulty rolling mill that can solve the scratches on the surface of the strip caused by the faulty looper equipment of the rolling mill when it is in the ...

AI Technical Summary

Problems solved by technology

[0002] In the hot continuous rolling finishing area, if the mechanical or electrical failure of a rolling mill occurs, the looper position is usually at a waiting position lower than the rolling center line. If no control is carried out, when the strip passes through the looper Rolls and transition plates will cause scratches on the surface of the strip and affect product quality, especially for special steel such as stainless steel