Elevator compensation chain impact damage defect detection method based on machine vision

Abstract

The invention discloses an elevator compensation chain impact damage defect detection method based on machine vision. The method is characterized by comprises steps that S1, for acquired original grayimages, the image partitioning technology is utilized to extract a region of interests in the middle of a chain; S2, texture analysis of the region of interests is carried out to acquire a texture analysis image, after average filtering of the texture analysis image is carried out, segmentation is carried out through utilizing the watershed algorithm to acquire a segmentation region; S3, morphological characteristics are extracted from the segmentation region, and preliminary defect determination is carried out; first threshold segmentation and skeleton extraction are carried out for the texture analysis image corresponding to the segmentation region which is initially determined to be defective, and secondary defect determination is carried out. The method is advantaged in that elevatorcompensation chain impact damage defects can be rapidly and accurately detected, applicability is strong, cost is low, and the method is suitable for industrialization.

Description

technical field [0001] The invention relates to a defect detection method of an elevator compensation chain, in particular to a machine vision-based detection method for a scuff defect of an elevator compensation chain. Background technique [0002] my country is the world's largest producer and consumer of elevators. The huge elevator market has promoted the vigorous development of the elevator parts industry. The elevator balance compensation chain is one of the key components that balance the operation of the elevator. It is used to balance the weight of the traction wire rope and accompanying cables during the movement of the elevator car to ensure the stability and safety of the elevator operation. As my country's elevator market enters a period of equal emphasis on new installations and maintenance, a large number of old elevators need to be replaced with compensation chains every year. Therefore, there is a huge market demand for elevator balance compensation chains....

AI Technical Summary

Problems solved by technology

[0006] 1. Each link is continuous, adjacent links are staggered, and the surface of the link is a curved surface. Bruise defects usually occur in the middle of the chain body, but the position is not fixed. If multiple groups of structured light solutions are used, the cost will be too high and uneconomical

[0007] 2. The surface of the chain body is reflective and is a rough surface. The gray value of the impact defect is close to that of the surrounding chain body surface, the contrast is low, and the edge is blurred and difficult to close. It is difficult to extract by conventional image processing methods

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