Improved bar straightness detection system and method based on visual detection

Abstract

The invention provides an improved bar straightness detection system based on visual detection. The improved bar straightness detection system comprises three sets of straightness detection devices. The straightness detection device comprises a first annular rack and a second annular rack; three lasers are evenly distributed on the first annular rack, when a bar moves to the first annular rack where the lasers are distributed, lasers emitted by the three lasers surround the circumference of the bar to form a circular ring, and three CCD cameras are evenly distributed on the second annular rack. The distance between every two adjacent sets of straightness detection devices is 1 m, and the three CCD cameras of each set of straightness detection devices shoot three circular ring images formedaround the bar at the same time. Aiming at the problem that the operation process of the bar is not stable, three groups of pictures are shot at the same time, and errors caused by vibration of the bar are avoided in the continuous detection process.

Description

technical field [0001] The invention relates to the technical field of bar rolling, in particular to an improved visual inspection-based bar straightness detection system and method. Background technique [0002] At present, the methods for measuring straightness at home and abroad mainly include: 1) laser collimation method; 2) self-collimation light tube detection method; 3) wire drawing method; 4) coordinate measurement method, etc. The first two methods use laser light and white light as the straight line reference respectively, and measure the straightness error according to the point-by-point movement of the target or reflector in the direction of the measured line; the third method uses the tensioned wire (such as thin steel wire) as the straight line reference, Use appropriate means (such as capacitance, inductance) to measure the straightness error. The above measurement methods are only suitable for offline sampling inspection, and cannot be used for online real-t...

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Problems solved by technology

[0003] Patent application CN201910342689.9 provides a bar straightness detection system and detection method. Due to the complexity of the actual situation, the running process of the bar is not stable, which brings difficulties to the straightness detection of the bar and is prone to errors

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