Control method and device for loop of hot continuous rolling finishing mill group

Abstract

The invention discloses a control method for a loop of a hot continuous rolling finishing mill group. The control method comprises the steps that rolling tension of an upstream rack of a throwing rack is increased before rolling; when a head is rolled, after a downstream rack of the throwing rack bites steel for a preset time, a loop angle of the throwing rack is increased to a first preset angle; when a tail part is rolled, after the upstream rack of the throwing rack throws steel, the loop angle of the throwing rack is reduced to a second preset angle; and when the tail part is rolled, after the downstream rack of the throwing rack throws steel, the loop angle of the throwing rack is reduced to the original position. According to the control method for the loop of the hot continuous rolling finishing mill group, on the basis that the cost is not increased, strip steel finish rolling scratches can be effectively avoided. The invention further provides a control device for the loop of the hot continuous rolling finishing mill group. The control device has the same advantages as the control method for the loop of the hot continuous rolling finishing mill group.

Description

technical field [0001] The invention belongs to the technical field of rolling surface quality control, in particular to a method and device for controlling a looper of a hot continuous rolling finishing mill. Background technique [0002] In the production process of hot strip steel, the looper device is an important part of the tension control in the rolling process. The main function of the looper device is to detect the size of the gap between the racks and realize the tension control. It is controlled by detecting the signal of the gap. The speed of the upstream frame enables the speed of the main drive to be adjusted quickly and accurately, correcting the deviation of the belt speed, avoiding the fluctuation of the width and thickness of the strip caused by tension fluctuations, and ensuring normal rolling production. In the case of throwing rolling, the looper of the throwing frame does not participate in the tension control, that is, the rolling process does not move...

AI Technical Summary

Problems solved by technology

However, since the distance between the throwing rolling mills is changed from 5 meters to 10 meters, and because the throwing rolling is of thick specifications, the weight per unit color temperature is relatively large. Frequent contact between the strip steel and the rear panel of the throwing rack

Scratch defects on the surface, after scratch defects, the rolling line needs to stop rolling and pull out the rolls, and polish the back plate, and the scratched rolls need quality repair treatment, which will seriously affect the output and quality of the rolling line, so it is necessary to control the scratch defects

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