Method for realizing sag control of color-coating production line by speed regulation

Abstract

The invention relates to a method for realizing sag control of a color-coating production line by speed regulation, belonging to the technical field of deep processing of cold-rolled sheets in metallurgy industry. The technical scheme provided by the invention is that: the method for realizing the sag control of the color-coating production line by speed regulation comprises the following steps of: measuring data through a sag instrument in front of a curing furnace; taking weighted average as sag-feedback data; introducing sag deviation into speed closed-loop control of a tension roller outside the curing furnace; adjusting the velocity of the tension roller according to the sag-feedback data; and finally realizing the sag control of the color-coating production line. The method disclosed by the invention has the beneficial effects that: the sag deviation is introduced into the velocity closed-loop of the tension roller, therefore the problem of overlarge sag fluctuation in the curing furnace is greatly alleviated, the product quality of a cold-rolled color-coated plate can be promoted, the poweroff resulted from sag is reduced, the yield is improved, and wastes are reduced.

Description

Technical field [0001] The invention relates to a method for realizing the sag control of a color coating production line through speed adjustment, and belongs to the technical field of cold-rolled plate deep processing in the metallurgical industry. Background technique [0002] At present, in the field of color coating production, the method of tension adjustment is generally used for sag control to achieve sag control. The original design of the cold-rolling color coating production line was also achieved by controlling the tension of the curing furnace to achieve sag adjustment. However, due to the lack of accurate monitoring of the tension in the furnace by the tensiometer, closed-loop tension adjustment could not be achieved. It often appeared in the start and stop of the production line and the coating machine. The problem of excessive sag fluctuation when passing through the stitching seam, starting and stopping at the entrance and exit, etc., due to the certain hysteresi...

AI Technical Summary

Problems solved by technology

The original design of the cold-rolled color coating production line also realizes the sag adjustment by controlling the tension of the curing furnace. However, due to the lack of accurate monitoring of the tension in the furnace by the tensiometer, it is impossible to realize the closed-loop adjustment of the tension. The sag fluctuates too much at the time of passing the stitching seam, starting and stopping at the entrance and exit, etc., because there is also a certain hysteresis in the tension adjustment, which is especially obvious when the coating machine passes the stitching seam, and the sag is unstable so that the steel belt goes up and down in the curing furnace Swing, the undulation is too large to scratch the paint surface of the steel strip, scrape the upper and lower bellows in the furnace, and produce waste products

In addition, each curing furnace is a single sag meter, if a failure occurs, it will cause the machine to stop due to the inability to adjust the sag

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