Tension control method for cold-rolled strip steel in acid continuous rolling working procedure

Abstract

The invention relates to a tension control method for cold-rolled strip steel in the acid continuous rolling working procedure. According to the tension control method, a withdrawal and straightening machine frequency converter and a PLC are adopted for controlling tension of the strip steel on a withdrawal and straightening machine section, when a set value of the tension of the strip steel on the withdrawal and straightening machine section is larger than zero, positive tension control is adopted, when the set value of the tension of the strip steel on the withdrawal and straightening machine section is smaller than zero, negative tension control is adopted, positive or negative switch control over the tension of the strip steel on the withdrawal and straightening machine section is achieved, the tension of strip steel in a pickling bath is controlled by controlling the tension of the strip steel on the withdrawal and straightening machine section, the tension of the pickling bath is increased substantially, and the problems that due to an existing control mode, the surface of the strip steel is scratched, rectorites are replaced frequently, and loss is caused are solved.

Description

technical field [0001] The invention relates to the technical field of cold-rolled steel strips, in particular to tension control of cold-rolled steel strips, in particular to a tension control method for cold-rolled steel strips in an acid continuous rolling process. Background technique [0002] An important process in the cold rolling process is pickling, through which the iron oxide scale on the surface of the strip is cleaned, so as to facilitate the further processing of the subsequent unit. In the pickling unit or the pickling continuous rolling process unit, the strip often passes through the tension leveler before entering the pickling tank. Through the action of the tension leveler, not only dephosphorization is carried out on the surface of the strip steel, but also the shape of the strip steel plate is improved, and then the strip steel enters the pickling tank for pickling to improve the pickling effect. During the pickling process of strip steel, because the p...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a tension control method for cold-rolled strip steel in the continuous acid rolling process. The tension control method can detect and convert the tension of the strip steel based on the torque of the tension leveler, and carry out "positive" or "positive" tension of the strip steel. "Negative" switching control, to achieve a substantial increase in the tension of the pickling tank, to solve the problem of scratches on the surface of the strip caused by the existing control method and the loss caused by frequent replacement of the support stone

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