Crack detection system and method for high-speed rail contact line based on laser ultrasound

Abstract

The invention relates to a crack detection system for a high-speed rail contact line based on laser ultrasound. The crack detection system comprises a contact line following device and a laser ultrasonic detection device; the contact line following device comprises a lifting bow, a transmission mechanism and a half-section cavity; the lifting bow is arranged on the roof of the detection train, andtwo sides of the lifting bow are connected with the half-section cavity through two corresponding groups of same transmission mechanisms; the laser ultrasonic detection device is mounted in the half-section cavity and comprises a control processing unit, a laser ultrasonic excitation device and an ultrasonic receiving device; the laser ultrasonic excitation device and the ultrasonic receiving device are installed on the laser ultrasonic detection adjusting mechanism. The contact line following device provided by the invention solves the problem that following detection cannot be carried out during driving due to zigzag and nonlinear laying of the contact line, is simple in structure, high in feasibility and reliability and lower in cost compared with an electrical device, can continue tobe optimized in the directions of weight reduction, vibration reduction and the like, and has a large improvement space.

Description

technical field [0001] The invention relates to the field of laser ultrasonic flaw detection, in particular to a detection system and a detection method for fatigue cracks or other possible cracks on the surface of contact wires for high-speed rail. Background technique [0002] Railway safety has always been the most concerned issue in railway transportation, especially the safety issues of higher-speed bullet trains and high-speed rails are more noticeable. The catenary wire in the catenary system that supplies power to high-speed rail is a very sensitive system, which is subjected to comprehensive effects such as high voltage, high current, high-speed friction, and large suspension tension. In long-term operation, fatigue cracks or other possible small cracks are likely to occur on the contact surface of the contact wire. The cracks will gradually extend inward due to tension, and in severe cases will cause the contact wire to break and endanger driving safety. Non-destr...

AI Technical Summary

Problems solved by technology

In the face of 25,000 kilometers of high-speed rail mileage, the damage of the contact line makes the base of safety hazards huge, difficult to detect, and difficult to maintain

However, the high-speed rail is out of service at night for maintenance, which saves time and possibility for the detection of contact wires.

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