Device and method for detecting and controlling tilting buckle head of band steel in rough rolling process

Abstract

The invention discloses a device and a method for detecting and controlling the tilting buckle head of band steel in the rough rolling process. The actual head tilting or buckle head condition of the rolled band steel can be detected by using head tilting and buckling detectors arranged above roller beds and between the roller beds and then the rolling speeds of an upper roller and a lower rollerfor biting the band steel can be automatically adjusted when the next band steel is rolled, so that upper surface band steel and the lower surface band steel consistently extend and the aim of controlling the tilting buckle head of the band steel can be achieved, wherein the control belongs to the feedback control. According to the invention, the rolling speeds of the upper roller and the lower roller can be adjusted by detecting the actual head tilting or buckle head condition of the band steel, and the detection process is not influenced by logged water, fog, the roughness of the rollers, the elevation of a rolling line, the amplitude of rolling reduction, the thickness of the band steel, the rolling speed and other factors, so that the invention has high accuracy of controlling the tilting buckle head, effectively improves the rolling quality of steel plates and the operation safety of operators and reduces the labor intensity.

Description

Technical field [0001] The invention relates to an automatic control technology for steel rolling, in particular to a device and method for automatically detecting and controlling a strip steel buckle during rough rolling. Background technique [0002] The hot-rolled strip is affected by the temperature difference between the upper and lower slab, the diameter difference between the upper and lower rolls, the speed difference and the deformation rate during the rolling process, which will cause the slab to be warped or buckled during the rolling process (the industry is collectively referred to as the warped buckle. ). The so-called warped head and buckle head means that after the strip head is bitten by the roll, it forms an upward or downward bend on the exit side. The upward bend is called the warped head, and the downward bend is called the buckle. When the warping and buckle of the strip after rough rolling reach a certain level, the damage is great, for example, it will af...

AI Technical Summary

Problems solved by technology

When the temperature of the upper surface of the strip measured by the thermometer is higher than the temperature of the lower surface, the upper surface of the strip due to the high temperature extends faster than the lower surface during the rolling process, which is likely to cause buckle

To keep the strip from buckling, the elongation speed of the upper and lower surfaces of the strip must be consistent, and the rolling speed of the upper roll needs to be reduced to balance the rapid elongation of the upper surface caused by high temperature

However, there are many reasons for strip buckling. The temperature difference between the upper and lower surfaces of the strip is only one aspect. The strip warping or buckling is affected by the roughness of the upper and lower rolls, the elevation of the rolling line, the reduction, the thickness of the strip, It is the result of the comprehensive influence of many factors such as rolling speed, and the temperature measured by the thermometer is too affected by the environment. If there is water on the surface of the strip and there is fog in winter, the measured temperature will not be accurate.

Since this patent is to measure the temperature before rolling and then adjust the rolling speed, it belongs to feed-forward control, so it often happens that the strip has already warped. At this time, the rolling speed of the upper roll should be increased to control the warped head, but due to The temperature of the upper surface of the strip steel measured by the thermometer is higher than the temperature of the lower surface. This patented technology will consider that the strip steel is prone to buckling and continue to reduce the rolling speed of the upper roll, causing the strip warping to intensify.

Therefore, the effect of using this patent to control the buckle head is not very good

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