Hot continuous rolling mill loop control method and used controller

Abstract

The invention discloses a control method for the loose cover of a hot strip mill, which comprises the steps that: a. the parameter in a controller of the loose cover is set in advance, namely at least two angle intervals of the loose cover device are set and the loose cover is arranged in different angle intervals with different corresponding compensation factors; b. the angle signals of the loose cover device are sent to the controller of the loose cover by an angle decoder when the hot strip mill starts to work; c. comparison is made between the angle signals of the loose cover and the set angle interval by the controller of the loose cover to determine the compensation factor of the loose cover device; d. an output compensation value is determined by the controller of the loose cover based on the compensation factor of the loose cover and output to a servo valve of the loose cover to make compensation to the loose cover device. The invention modifies the control property of the loose cover and promotes the stability thereof.

Description

technical field [0001] The invention relates to a hot continuous rolling mill, in particular to a looper control method of a hot continuous rolling mill and a used controller. Background technique [0002] As shown in Figure 1, a looper device 2 is installed between the two racks. During the operation of the hot rolling mill, the looper device 2 supports the steel strip body 1 and absorbs the looping caused by dynamic speed change. Amount, maintain normal continuous rolling relationship and maintain a basically constant tension, maintain a certain amount of loops between continuous rolling stands, and can absorb changes in the amount of loops in a limited way; its other function is as a detection device to detect the amount of loops and tension, As a feedback signal for the looper controller. [0003] Fig. 2 shows the structural diagram of the looper device. Due to the mechanical structure characteristics of the looper device 2, the looper support hydraulic pressure is appl...

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Problems solved by technology

[0004] The working range of the looper angle is 9° to 61°, the compensation of the original system is fixed compensation, and the weight of the looper and the weight of the steel strip body are taken as the compensation value when the looper working angle is 25°; but in the actual operation process, especially When rolling thin-gauge steel, the looper will fluctuate in the range of 25°±10°, and even reach 50° during the strip threading process. This compensation value exists when the looper leaves an angle of 25° The deviation aggravates the fluctuation of the looper, and it is more severe when rolling thin gauges, and it will cause steel stacking accidents in serious cases; the original system is designed with a fixed looper weight compensation value to offset the weight of the looper at 25° , obviously, in the prior art, in the looper compensation method, the compensation is inaccurate; the controller used in the existing compensation method is shown in Figure 3, in the prior art, the compensation coefficient is not calculated according to the angle signal of the looper device Adjustment, the looper compensation coefficient used in the coefficient is a constant, and the stability of the looper is poor

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