Visual detection method for inner wall structure of annular body

Abstract

The invention relates to a visual detection method for an inner wall structure of an annular body. A used detection system comprises a camera, a computer and a conical-surface reflector, the conical-surface reflector and the camera are positioned at the two sides of the inner wall of the annular body and just face the camera, and an image formed by the conical surface reflector of the inner wall of the annular body is collected by the camera. The detection method comprises that lower and upper boundaries of the inner wall are positioned by edge extraction and oval fitting, and position withinthe boundaries is an image position corresponding to the inner wall of the annular body; a polar coordinate system is established according to the identified image position, the polar radius and polarangle corresponding to the height and azimuth of the inner wall of the original annular body; and correspondence between the polar radius and the practical inner wall height is obtained by calibration; the inner wall structure of the annular body is identified by means of feature extraction, and position information of the inner wall structure is calculated according to a calibration result before; and whether the inner wall structure is qualified is determined.

Description

technical field [0001] The invention relates to a visual inspection system for an annular inner wall structure. Background technique [0002] The annular body with structure on the inner wall is a common mechanical part, which is widely used in many mechanical transmission fields such as planetary gear transmission structure. With the continuous increase of its application requirements, it has entered the era of mass production and assembly. According to different application occasions, the annular body with structure on the inner wall often has different structures such as slider grooves at some positions on the inner wall surface. Considering that in the process of mass production, it is inevitable that the missing sequence or misplacement of processing will occur. Therefore, before the automatic assembly, it is often necessary to first detect the key structure to avoid the mechanical structure caused by the missing sequence or misalignment of processing. Collision, even...

AI Technical Summary

Problems solved by technology

[0004] (1) From the perspective of production process and cost, manual inspection will introduce unnecessary additional links to the production and assembly of the annular body, which is not conducive to the realization of fully automatic production and assembly, and will also increase labor costs;

[0005] (2) From the perspective of production efficiency, the speed of manual detection is slow and it is difficult to realize online detection;

[0006] (3) From the perspective of detection results, the reliability of manual detection cannot be guaranteed, and it is easy to introduce human error or misjudgment

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