Device and method for real-time monitoring of rail temperature stress based on laser ultrasonic method

Abstract

The invention discloses a device and method for real-time monitoring of rail temperature stress based on a laser ultrasonic method, which includes a monitoring trolley and a power supply group. The monitoring trolley includes an upper body, a lower body, wheels, a positioner and a temperature measuring instrument. The lower body is equipped with a laser ultrasonic Monitoring unit and data analysis and processing unit, laser ultrasonic monitoring unit includes pulsed laser, laser probe and signal conditioning amplifier circuit, data analysis and processing unit includes data memory, processor and wireless transmission module, pulsed laser and laser probe are placed in the lower body On the front and back sides of the interior, the signal conditioning amplifier circuit, the data memory and the wireless transmission module are connected with the processor through the data line. The pulsed laser emits pulsed laser light to act on the rail to generate ultrasonic waves. The laser probe receives the ultrasonic signal and transmits the measurement time value to the processor to monitor the temperature and stress of the rail accurately in real time, providing a new means for non-destructive testing of the rail and ensuring the safe operation of the rail. is of great significance.

Description

technical field [0001] The invention relates to a device and method for real-time monitoring of rail temperature stress based on a laser ultrasonic method, and belongs to the technical field of seamless rail detection. Background technique [0002] Seamless long rails are widely used in high-speed railways. The trains run at high speeds and run smoothly and reliably, which greatly improves the service life of line equipment and rolling stock. The seamless rail is to weld the 25m long rail into a 1000m to 2000m long rail, and lay it on the line to become a section or dispute seamless line. However, with the disappearance of the rail joints, the welded rails cannot freely expand and contract when the rail temperature changes, so temperature stress occurs in the rails. Because the rails are affected by thermal expansion and contraction, when the outside temperature is high, the temperature of the rails will continue to rise, and compressive stress will be formed inside the rai...

AI Technical Summary

Problems solved by technology

However, due to its own limitations, such as damage to the rail surface, low efficiency, low precision, high surface requirements, and the need for coupling agents, it cannot be widely used.

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