Loop control method involving hot-rolled steel strip head

Abstract

The invention belongs to the technical field of hot rolling mill loop control, and provides a loop control method involving a hot-rolled steel strip head. The method comprises the following steps of S1, pulling a loop with a fixed torque when a PLC receives a biting signal sent from a downstream rack; S2, judging whether to enter PI height closed loop control of a head loop upon completion of looppulling, and regulating the loop height based on the PI height closed loop control of the head loop if yes; and S3, judging whether the flow of the steel strip head needs to be compensated or not after regulation of the loop height, and increasing the speed correction of an upstream rack if yes. A hot metal flow compensation control function is added in the control method, and the flow loss of the head is compensated in time through quick regulation of the loop height; and the problems of narrowing and rolling break occurred in the penetrating process of the hot-rolled steel strip head in a hot rolling mill can be solved effectively.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled looper control, and provides a looper control method related to the head of a hot-rolled strip steel. Background technique [0002] During hot strip rolling, the looper plays an important role in forming and stabilizing the rolling relationship. During the rolling process, although the looper height control is not completed by the looper itself, but by adjusting the speed of the main drive of the front frame and the rear frame, the looper itself only provides tension for the strip, but the looper The lifting of the sleeve rolls and the control of contacting the strip are accomplished by the looper control itself. [0003] The hot continuous rolling finishing mill generally has 7 racks and 6 looper devices. The number of loopers corresponds to the number of racks, that is, the 4# looper corresponds to the 4# rack, and the downstream rack of the looper is the 5# machine. shelf. In the producti...

AI Technical Summary

Problems solved by technology

Usually, the following problems will occur in the strip head during the strip threading process: head narrowing, deviation and crushing. There are many factors that cause these consequences, but the most direct impact is the second flow balance between racks. Destruction, showing the sheathing and steel drawing phenomenon of the strip steel in the process of threading the strip between the rolling mills. The most common is the long-distance narrowing of the strip head. When the flow deviation of the rack exceeds a certain range, scrap steel even occurs.

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