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Looseness detection method of bolt

A detection method and technology of bolt looseness, applied in image data processing, instrumentation, calculation, etc., can solve problems such as low bolt efficiency, bolt looseness, time-consuming and labor-intensive problems, and achieve improved pertinence, improved evaluation and monitoring, improved safety and reliability effect

Active Publication Date: 2015-06-03
TSINGHUA UNIV +1
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to propose a detection method for bolt looseness, which aims to overcome the problems of low efficiency, time-consuming and labor-intensive, fatigue misjudgment and other problems in the traditional detection of bolt looseness

Method used

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Embodiment Construction

[0018] The detection method of bolt looseness that the present invention proposes, its flow chart is as figure 1 shown, including the following steps:

[0019] (1) Mark the bolts to be tested after tightening, such as figure 2 As shown, the first mark 2 is made on the fixed part 1 of the bolt, the second mark 4 is made on the rotating part 3 of the bolt, the first mark 2 and the second mark 4 are on a straight line, and the symbol of the mark is a straight line or a dot , in one embodiment of the present invention, the first mark and the second mark are straight lines;

[0020] (2) After the bolt to be tested is loosened, take a photo of the bolt, the photo includes the first mark, the second mark and the complete image of the bolt to be tested;

[0021] (3) After capturing the image, use the calculation algorithm of the image angle to recognize the coordinate positions of the first mark and the second mark in the photo through image grayscale, image binarization, edge dete...

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Abstract

The invention relates to a looseness detection method of a bolt, and belongs to the technical field of mechanical state detection and maintenance. The looseness detection method comprises the following steps of first marking a tightened bolt to be detected, after the bolt to be detected is loose, and taking a picture, which includes a first mark, a second mark and the complete image of the bolt to be tested, of the bolt; after the image is taken, recognizing the coordinate positions of the first mark and the second mark in the picture respectively through image graying, image binaryzation, edge detection and characteristic symbol judgment by using the angle calculation method of the image; calculating a relative rotation angle between the two marks according to the coordinate positions; comparing the relative rotation angle with a set angle threshold value, and carrying out a tightening operation on the loose bolt. By using the looseness detection method, the pertinence of the looseness detection of the bolt is improved, and the safe and reliable running of equipment is guaranteed.

Description

technical field [0001] The invention relates to a detection method for bolt looseness, which belongs to the technical field of mechanical state detection and maintenance. Background technique [0002] At present, as a connecting piece, bolts are widely used in various fields of national production, such as railway transportation, aerospace, wind power generation, machining, etc. The tightening state of the bolt will directly affect the working performance of the equipment, and if there is a problem, it may cause disastrous consequences. [0003] Usually, the failure of bolts mainly includes fracture and loosening, among which loosening is the most common problem. At present, there are many detection methods for bolt looseness, such as detection of changes in pre-tightening force, detection of nonlinear characteristics of connection systems, and detection of acoustic emission signals. These methods can indeed detect the loosening of bolts, but their operations are often com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
Inventor 田煜赵乾陶大帅马纪军杨帅
Owner TSINGHUA UNIV
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