Tracking, correcting method of welding seam in cold rolling production line loop region and system thereof

Abstract

The invention discloses a tracking, correcting method of a welding seam in a cold rolling production loop region and a system thereof. The method comprises the following steps: obtaining a proportionality coefficient K and an offset between a theoretic length curve and an actual length curve through the computation of a strip steel theoretic length and a theoretic length curve in a loop region, and the strip steel theoretic length and an actual length curve after the welding seam enters the loop region; obtaining the strip steel actual total length in the loop region through the computation of the proportionality coefficient K, the OFFSET and the strip steel theoretic length; comparing the strip steel actual length with the strip steel actual total length in the loop region to judge the actual position of the welding seam in the loop region so as to precisely trace the welding seam in the loop region; meanwhile, setting a synchronous position between an empty sleeve position and a full sleeve position, recalibrating an absolute value encoder once each loop trolley passes through the synchronous position so as to eliminate the computing error caused by the mechanical sliding; a welding seam tracing error value concept is established, and the correction measurements can be adopted aiming at different conditions of the welding seam tracing error value.

Description

technical field [0001] The invention relates to the field of electrical control, in particular to a method and system for tracking and correcting weld seams in the looper area of ​​a cold rolling production line. Background technique [0002] At present, the modernized high-level cold rolling continuous production lines—the combination unit of pickling mill, continuous hot-dip galvanizing unit, continuous annealing unit, color coating unit, continuous electrotinning unit, etc., all have looper areas, which can maximize the Satisfying the high-speed, automation and continuous requirements of the production line is crucial to realizing precise control of strip tension and reasonable matching of speed, increasing output and producing high-grade strips. [0003] At present, there are mainly two forms of looper areas in cold rolling production lines, namely horizontal looper areas and vertical looper areas. The horizontal looper area is mainly used for pickling unit and silicon ...

AI Technical Summary

Problems solved by technology

[0016] The basic seam tracking can be realized by using the incremental encoder of the transmission and the weld detector, but due to the existence of the looper area, it has many shortcomings: 1. The incremental encoder of the transmission can track the length on the production line For the strip steel at a constant position, the length of the strip steel in the looper area changes, and the length value cannot be accurately calculated only by the incremental encoder, so it is impossible to achieve accurate weld seam tracking in the looper area; 2. Since there may be defects and holes on the strip, and there may be multiple welds on the production line, it is necessary to limit the hole detection of the weld detector. If it exceeds a certain range, it is considered invalid detection, and the error of the weld position caused by the looper area It may be far beyond this range, which will eventually lead to the failure of the weld tester; 3. The weld tester is generally behind the looper area and before some important production equipment that requires precise positioning of the weld, such as tension levelers, disc shears, etc. , heating furnace, skin pass mill, rolling mill, etc., if the tracking error of the weld seam position in the loop area is too large, and the weld seam detector is completely relied on to correct it, then when the weld seam detector fails or the light source is blocked by foreign objects, it will cause Production accidents, resulting in large economic losses

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