Laser ultrasonic method-based steel rail temperature stress calibration platform

A technology of laser ultrasound and temperature stress, which is applied in the calibration/testing of force/torque/power measuring instruments, measuring devices, instruments, etc., can solve the problems that the simulation method cannot simulate the authenticity, the field test method takes a long time, and achieve the detection The effect of fast speed, simple structure and low requirements

Active Publication Date: 2016-07-20
WENZHOU UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the measurement of rail temperature and stress is mainly through simulation and on-site testing. The simulation method cannot simulate the authenticity and has limitations. The on-site testing method takes a long time

Method used

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  • Laser ultrasonic method-based steel rail temperature stress calibration platform

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Embodiment Construction

[0018] The rail temperature stress calibration platform based on the laser ultrasonic method includes a rail fixing device for fixing the rail, a rail tension and compression device for applying tension or pressure to the rail to change the stress state of the rail, and a laser ultrasonic for exciting ultrasound on the rail surface An excitation device and a laser ultrasonic receiving device for receiving ultrasonic signals and calibrating the receiving time under different stresses.

[0019] Such as figure 1 As shown, the rail fixing device includes a concrete base 7 for carrying the rail 6 and a pressing plate 8 for pressing and fixing the rail. .

[0020] The rail pulling and pressing device includes a rail locking mechanism 13, an oil cylinder 14 and a reversing valve 11. A rail locking mechanism 13 is respectively fixed at the front and rear ends of the rail, and an oil cylinder 14 is arranged between the front and rear rail locking mechanisms on the same side. The oil ...

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Abstract

The invention discloses a laser ultrasonic method-based steel rail temperature stress calibration platform, which comprises a steel rail fixing device, a steel rail tension and compression device, a laser ultrasonic excitation device and a laser ultrasonic receiving device, wherein the steel rail tension and compression device comprises steel rail locking mechanisms, oil cylinders and reversing valves, the front end and the rear end of the steel rail are respectively fixed with one steel rail locking mechanism, the oil cylinders are arranged between the same sides of the front steel rail locking mechanism and the rear steel rail locking mechanism, an oil port of a rod cavity of each oil cylinder is connected with the reversing valve via an oil pipe, an oil port of a rodless cavity of each oil cylinder is connected with the reversing valve via an oil pipe, and the reversing valve is connected with a hydraulic power unit via a pipeline. Tension or compression is applied to the steel rail via the steel rail tension and compression device, the stress state of the steel rail is changed, ultrasounds are excited on the surface of the steel rail by the laser ultrasonic excitation device, the laser ultrasonic receiving device receives ultrasonic signals, and the receiving time under different stresses is marked. Pulse laser is adopted to excite the ultrasounds, a coupling agent is not needed, a non-contact mode is provided, requirements on the surface of the steel rail are low, the detection speed is quick, and the efficiency and the precision are high.

Description

technical field [0001] The invention relates to a rail temperature stress calibration platform based on a laser ultrasonic method, belonging to the technical field of railway engineering. Background technique [0002] Seamless steel rails can realize high-speed and heavy-duty railways, and have been widely used. The reduction of the joints of the rail saves joint parts and reduces the vibration of the train. However, due to the disappearance of the rail joint, it is constrained by the resistance of the pressure plate and the resistance of the ballast bed. When the rail temperature changes, the thermal expansion and contraction of the rail will generate temperature. stress. High temperature in summer will form compressive stress inside the rail, which is prone to rail swelling, and low temperature in winter, will form tensile stress inside the rail, and rail breakage will easily occur, which seriously threatens the reliability and safety of train operation. Therefore, how t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L25/00
CPCG01L25/00
Inventor 冯爱新张津超薛伟赵莹杨海华程好缪熠楠
Owner WENZHOU UNIVERSITY
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