Device and method of monitoring steel rail temperature stress in real time based on laser ultrasonic method

Abstract

The invention discloses a device and a method of monitoring steel rail temperature stress in real time based on a laser ultrasonic method. The device comprises a monitoring trolley and a power pack, wherein the monitoring trolley comprises an upper trolley body, a lower trolley body, wheels, a positioner and a temperature meter; a laser ultrasonic monitoring unit and a data analyzing and processing unit are arranged inside the lower trolley body; the laser ultrasonic monitoring unit comprises pulse lasers, laser probes and a signal conditioning amplification circuit; the data analyzing and processing unit comprises a data storage unit, a processor and a wireless transmission module; the pulse lasers and the laser probes are arranged on the front side and the rear side of the lower trolley body; and the signal conditioning amplification circuit, the data storage unit and the wireless transmission module are connected to the processor by data lines. The pulse lasers send pulse laser to act on steel rails and ultrasonic waves are produced; ultrasonic wave signals are received by the laser probes; a measurement time value is transmitted to the processor; the steel rail temperature stress is accurately monitored in real time; and a new means is provided for steel rail nondestructive testing, and is significant for guaranteeing the safe running of the steel rails.

Description

Technical field [0001] The invention relates to a device and a method for real-time monitoring of the temperature stress of a steel rail based on a laser ultrasonic method, and belongs to the technical field of seamless steel rail detection. Background technique [0002] High-speed railways widely use seamless long rails, with high train speeds and stable and reliable operation, which greatly improves the service life of line equipment and rolling stock. Seamless steel rail is the welding of a 25m long rail into a 1000m to 2000m long rail, which is laid on the line to become a section or dispute seamless line. However, as the rail gap disappears, the welded rails cannot expand and contract freely when the rail temperature changes, so temperature stress is generated in the rails. As the rails are affected by thermal expansion and contraction, when the outside temperature is high, the temperature of the steel rails will continue to rise, and compressive stress will form inside the...

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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