Roll speed control method and device for passivation roll coater

Abstract

The invention discloses a roller speed control method and device of a passivation roller coater, and belongs to the technical field of continuous hot-dip galvanization. The roller speed control methodcomprises the following steps: acquiring the strip steel speed of a production line; comparing the strip steel speed of the production line with the preset critical value, so as to acquire a comparison result; and if detecting that the strip steel speed of the production line is less than the critical value according to comparison result, starting up a variable-proportion control model. Accordingto the variable-proportion control model, Pt is equal to Vt divided by VL and Ps is equal to Vs divided by VL, wherein Pt stands for the proportional constant of coating rollers, Ps stands for the proportional constant of pick-up rollers, Vt stands for the roller speed of the coating rollers of a passivation machine, Vs stands for the roller speed of the pick-up rollers of the passivation machine, and VL stands for the strip steel speed of the production line. The roller speed control device comprises an acquiring unit, a comparing unit and an executing unit. Through the variable-proportion control of the passivation roller speed in a low-speed segment, dense passivation roller marks generated during low-speed passivation can be avoided; and the roller speed control method achieves the technical effects that the cold-rolled product quality can be improved, the production cost of the production line can be reduced, and the stability and smoothness of the production line can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of continuous hot-dip galvanizing, in particular to a method and device for controlling the roll speed of a passivated roll coater. Background technique [0002] Since the continuous hot-dip galvanizing production line frequently changes the steel specifications, the skin pass machine needs to change rolls frequently. During the roll change process, the skin pass section needs to slow down and crawl. If passivated products are produced during the crawl process, due to the low speed, the strip steel and The speed difference between the coating rollers becomes smaller, which is equivalent to the direct copying of the coating rollers to the strip steel, resulting in dense passivation roll marks on the surface of the strip steel, resulting in unqualified products. In order to reduce the problem of dense passivation roll marks due to the change of rolls in the passivation machine or other abnormal conditions, it ...

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the technical problem of dense passivation roll marks on the strip due to roll change of the passivation machine or low-speed passivation under other abnormal conditions by providing a roll speed control method of the passivation roll coater

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