Evaluation method and system for bolt connection process of mechanical structure
Through the combination of machine vision and ultrasonic detection, the shortcomings in bolt connection process evaluation are solved, accurate control of preload force is achieved, and assembly quality and service safety are ensured.
CN120489424APending Publication Date: 2025-08-15CRRC QINGDAO SIFANG CO LTD
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Patent Information
- Application Number
- CN202510573532.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2025-08-15
AI Technical Summary
Technical Problem
The existing bolt connection process lacks effective evaluation methods, resulting in insufficient preload control accuracy, affecting assembly quality and service safety.
Method used
Through machine vision, the contact area between bolts, nuts and connectors is detected, combined with ultrasonic detection of the stress status of bolts, the preload force is comprehensively calculated, and an evaluation report is formed to ensure the accuracy of preload force.
Benefits of technology
It has achieved scientific evaluation of the bolt connection process, improved the control accuracy of preload, and ensured assembly quality and service safety.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention provides an evaluation method and system for a bolt connection process of a mechanical structure, and the method comprises the steps: obtaining a plurality of images containing gaps among bolts, nuts and connecting pieces within a first set time period after the bolt connection operation of the mechanical structure, carrying out the preprocessing of the images, and extracting geometric features; on the basis of the extracted geometric features, comparing the contact area of the bolt, the nut and the connecting piece with the theoretical contact area, calculating the fitting rate, and carrying out surface crack quantification to obtain an appearance detection result; the stress state of the bolt is determined based on the ultrasonic detection data, the pre-tightening force borne by the bolt is calculated, and an axial force detection result is obtained; and integrating the appearance detection result and the axial force detection result, introducing a weight and a physical constraint item, determining a final detection result, and forming an evaluation report of the bolt connection process of the mechanical structure according to the final detection result. According to the invention, the limitation of a single detection method is solved, and effective evaluation of the tightening process is realized.
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