Strip steel transverse flatness measurement method and system based on multi-laser vision sensing

By using a multi-laser vision sensing system, combined with the gray-scale centroid method and the least squares method, high-precision transverse straightness measurement of steel strips was achieved. This solved the problems of reliance on manual inspection and insufficient accuracy of laser vision measurement in existing technologies, and supported equipment parameter adjustment and flattening machine position optimization.

CN121383913BActive Publication Date: 2026-03-20TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Patent Information

Application Number
CN202511960892.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-12-24
Publication Date
2026-03-20
Estimated Expiration
2045-12-24

AI Technical Summary

Technical Problem

Current methods for straightening steel strips rely on manual labor, which cannot achieve high-precision lateral straightness measurement, especially under high temperature conditions and at specific locations on the flattening machine. Furthermore, existing laser vision measurement methods cannot meet the needs of high-end applications.

Method used

A multi-laser vision sensing system is adopted. By installing multiple laser vision devices on the strip roller conveyor, and combining the gray-scale centroid method and the least squares method, the coordinates of the center of the laser stripe are fitted. Unequal spacing between the laser vision devices is set to filter out vibration interference and realize the measurement of lateral straightness.

Benefits of technology

It improves the accuracy and practicality of transverse straightness detection of strip steel plates, enabling straightness measurement at any position and supporting parameter adjustments for rolling mills, straighteners, and flattening machines, thus meeting the requirements of high-end applications.

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Abstract

The present application belongs to the technical field of metallurgical equipment intelligence, and provides a strip steel transverse flatness measurement method and system based on multiple laser vision sensors, comprising: sequentially installing a laser speed measuring instrument, a first set of laser vision devices, a second set of laser vision devices and a third set of laser vision devices on a support above a strip steel roller, and collecting laser stripe images on the surface of the running strip steel; performing ROI region processing on the laser stripe images to identify the laser stripes in the laser stripe images; using a gray center of gravity method to extract the center coordinates of the laser stripes, and using a least squares method to fit the center coordinates to obtain a fitting equation; performing vibration filtering on the fitting equation, setting a vibration compensation term, calculating the strip steel transverse flatness, and adjusting the equipment parameters of the rolling mill and the straightening machine and the placement position of the flattening machine pad based on the strip steel transverse flatness. The present application realizes high-precision dynamic detection of the flatness of the strip steel.
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