Visual detection device and method for wire rods without tension constraint

Abstract

The invention relates to the field of machine vision technology, in particular to a surface quality detection device and method for tubes, rods and wire rod products in the iron and steel industry without tension constraint. The visual detection device for wire rods without tension constraint includes a plurality of cameras (1) mounted on a sliding guide rail (3), the sliding guide rail (3) is fixed on a fixed plate (4) and is circumferentially distributed along the periphery of a hollow guide slot (2), when a detected wire rod (5) passes through the hollow guide slot, the cameras image the outer surface of the wire rod, the imaging distances between the cameras and the detected wire rod are equal; and when the wire rod specification changes, cameras perform position adjustment along the sliding guide rail to keep the imaging distances between the cameras and the detected wire rod equal. The device and the method provided by the invention can realize automatic adjustment of camera imaging distance so as to achieve focusing, thus ensuring clear imaging of the detection system under the circumstance of constant resolution.

Description

technical field [0001] The invention relates to the technical field of machine vision, in particular to a surface quality detection device and method for tubes, rods and wire products in the iron and steel industry under no tension constraints. Background technique [0002] In product surface quality inspection, inspection systems based on machine vision technology are widely used. The surface quality inspection of tubes, rods, and wire products is quite different from other flat and rotating products in terms of light source arrangement and imaging methods because of their circular outer surfaces, especially the diameter specifications of such products change. When , the relative distance between the circular surface and each imaging device changes, in order to ensure clear imaging, the camera focal length or imaging distance needs to be adjusted. [0003] At present, only a few units in the world are engaged in the research and development of such products, such as OG Com...

AI Technical Summary

Problems solved by technology

However, none of the related patents takes into account the adjustment method of keeping the resolution of the imaging system constant when the measured object specification changes and there is no tension constraint.

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