Control method of alternative pressure of side guides of hot strip mill coiler

Abstract

The invention relates to a control method of alternative pressure of side guides of a hot strip mill coiler, the driving side and the operating side of the side guides are alternatively controlled by adopting a position model and a pressure model, and the technical scheme of controlling by the prior position model only is changed. The invention greatly reduces the pressure oscillation at two sides of the side guides because of alternative pressure control, obviously reduces the convolute movement defect, can adapt to the coiling of various thick and thin specifications of band steel, and can lead the pressure at two sides of the side guides to keep consistently balance, thereby ensuring the symmetry of the abrasion of the two side guides.

Description

technical field [0001] The invention relates to the field of metallurgical industry, in particular to a method for controlling alternating pressure of side guide plates of a hot rolling coiler. Background technique [0002] The main function of the side guide plate of the hot-rolling coiler in the field of metallurgical industry is to center the strip before it bites, and to apply a certain clamping force to the strip after the head of the strip bites, so as to prevent the strip. Ensure that the end face of the steel coil is neat and prevent edge damage, overflow and staggered layer defects. refer to figure 1 In the figure, the side guide plate of the hot rolling coiler is driven by the motor 33 to drive the worm gear mechanism 32 and the rack and pinion mechanism 31 to push the side guide plates 34 and 35 to open and close. The side guide plate of the hot rolling coiler adopts the position control method, that is, the system only controls the position of the side guide pl...

AI Technical Summary

Problems solved by technology

However, since the drive side guide plate is not designed with a short-stroke oil cylinder and pressure sensor, when the strip steel swims to the drive side, the pressure exerted by the strip steel on the drive side guide plate cannot be detected

[0010] 2. Can not guarantee a stable side guide plate clamping force;

[0011] By analyzing the pressure records of the side guide plate, it is found that the position control method cannot guarantee that the guide plate exerts a stable clamping force on the strip

When the strip is coiled, although the position of the guide plate does not change, the pressure on both sides of the guide plate will fluctuate obviously, which will cause cross-layer defects

[0012] 3. Large operating load;

In this way, each specification or even each piece of steel strip needs the operator to constantly adjust the position of the side guide plate according to the actual situation, and the operation load is very heavy.

[0014] 4. Asymmetric clamping force will cause uneven wear of the guide plates on both sides;

Due to the limitations of measurement methods and the differences in personnel skills, there will be a certain deviation in the actual distance between the guide plates on both sides and the rolling center line

This deviation will cause the clamping force of the guide plates on both sides to be different, and the wear of the guide plates will be uneven

[0016] 5. Cannot adapt to the influence of strip width change on clamping force;

On the one hand, this problem is likely to cause edge damage defects in thin-gauge strip steel; on the other hand, this problem will also lead to accidents where the tail of thick-gauge strip steel is pinched by the guide plate

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