A method for predicting the amount of loopers in hot rolling mills

Abstract

The invention provides a forecasting method for loop length of a hot continuous rolling mill, which is used for forecasting all loop lengths between racks of hot continuous rolling before strip steel threading. According to the invention, the speed of anti-loop opening or anti-narrowing of the hot continuous rolling mill the loop corresponding to each loop can be obtained through the loop length generated at the moment of strip steel biting and speed drop compensation valve in order to prevent loop opening or loop narrowing, so as to obtain a loop length coefficient. The more is the loop length coefficient close to zero, the more stable threading of the strip steel can be realized, and accordingly, loop opening and narrowing can be avoided.

Description

technical field

[0001] The invention relates to a control method in a metallurgical process, in particular to a control method for a looper in a hot continuous rolling mill. Background technique

[0002] Strip threading is a very important and difficult to control link in the hot rolling operation process. When threading the strip, the strip bites into the frame, causing a sudden change in the load of the rolling mill, which causes a dynamic speed drop in the transmission system.

[0003] The looper system of hot continuous rolling uses the amount of loops formed by the dynamic speed drop to control looping. At present, the newly built production lines all use hydraulic loopers with high positioning accuracy and fast response speed, and their structural settings are as follows: figure 1 As shown, a looper roller 4 is arranged between the upstream frame 1 and the downstream frame 2, the looper angle is C, the front elevation angle is A, and the back elevation angle is B, an...

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