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

Abstract

The invention relates to a laser ultrasonic-based high-speed rail contact line crack detection system, which has a contact line follower device and a laser ultrasonic detection device; the contact line follower device includes a lifting bow, a transmission mechanism and a half-section cavity; the lifting bow is installed on the detection device. The train roof, the two sides of the lifting bow are connected to the half-section cavity through the corresponding two sets of identical transmission mechanisms; the laser ultrasonic detection device is installed in the half-section cavity, and the laser ultrasonic detection device includes a control processing unit, a laser ultrasonic excitation device and An ultrasonic receiving device; a laser ultrasonic excitation device and an ultrasonic receiving device are installed on the laser ultrasonic detection and adjustment mechanism. The present invention proposes a contact line following device, which solves the problem of inability to follow and detect during driving caused by the "zigzag" and non-straight laying of the contact line. The contact line following device has a simple structure and is more feasible and reliable than an electrical device. , the cost is lower, and it can continue to be optimized in the direction of weight reduction and vibration reduction, and there is a large room for improvement.

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 a contact line for powering a 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 motor trains and high-speed railways are more noticeable today. The contact line in the catenary system that supplies power to the high-speed rail is a very sensitive system, which bears the combined effects of high voltage, high current, high-speed friction, and large suspension tension. In long-term operation, fatigue cracks or other possible small cracks are prone to occur on the contact surface of the contact line. The cracks will gradually extend inward due to tension, and in severe cases, the contact line will be broken, endangering driving safety. Nondest...

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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