A step-step control method for coil-assisting rolls with automatically optimized timing for hot-rolled coiling

Abstract

Provided is a wrapper roller skip control method capable of achieving automatic timing sequence optimization for hot rolling and coiling. The influence of rolling speed change and servo valve ageing slow response on head tracking is considered, AJC automatic timing sequence correcting is conducted, specifically, when the tracking length is larger than or equal to the distance L-a between a pinch roller and a wrapper roller, the wrapper roller is pressed downwards till being attached to a steel plate from a waiting position, then tracking is conducted in a timing sequence mode, that is, skipping is conducted when the head of a second circle is at a delta-delta angle before reaching the wrapper roller, the head is pressed downwards till being attached to the steel plate after reaching the wrapper roller, and the skip timing sequences of the subsequent circles are the same as that of the second circle, wherein a=V*(H1 / v+t), and delta=[V*(Hi / v+t) / (piD)]*360 degrees. Compared with the priorart, the wrapper roller skip control method has the beneficial effects that negative influence caused by inaccurate timing sequence control is avoided, the rate of production accidents is lowered, and the production efficiency and product quality are finally improved.

Description

technical field [0001] The invention relates to industrial automation control, in particular to a step control method for coil-assisting rolls that automatically optimizes the time sequence of hot-rolled coiling. Background technique [0002] In the production of hot-rolled strip steel, the coiling AJC automatic jump control is very important, and its purpose is to minimize the indentation on the strip due to the collision between the strip head and the coiling roll during coiling. [0003] The basic principle of automatic jump control is: see figure 1 , automatically track and calculate the position of the head of the strip 3 and send a signal to the electrical control. Each coil-assisting roll 6 is equipped with a position and pressure controller. After the coiling process of the strip steel 3 begins, whenever the head of the strip steel 3 turns to a very close position from any of the coil-assisting rolls 6, the coiling-assisting roll 6 are all lifted up quickly, and st...

AI Technical Summary

Problems solved by technology

[0004] At present, both at home and abroad, fixed angle or fixed tracking length are used to control the skipping control sequence of hot rolling coils at home and abroad. The response characteristics of the servo valve 7 are not considered, especially after several years of use, the characteristic aging response becomes slower.

Another reason is that the influence of different rolling speeds of different specifications on AJC tracking is not considered. The speed difference of the thinnest and thickest specifications is 3-4 times, that is, the jump is too early when the rolling speed (3m / s) is slow; s) Jumping step does not jump up when fast

Inaccurate AJC control timing can easily lead to slipping of the head, slipping of the head, poor roll shape of the head, indentation of the head, large mechanical vibration and even steel jamming

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