Steel rail magnetic flux leakage detection device based on zero lift-off rolling magnetization

Abstract

The invention discloses a steel rail magnetic flux leakage detection device based on zero lift-off rolling magnetization. The device comprises a magnetizing coil used for generating an excitation magnetic field, a U-shaped magnet yoke used for forming a magnetizing loop, a profiling rolling magnetizing wheel in direct contact with a steel rail, a magnetic flux leakage detection sensor array used for being installed on a probe mechanism, and a grating encoder used for defect position positioning. The U-shaped magnet yoke, the detected steel rail and the profiling rolling magnetizing wheel forma magnetizing loop. As the profiling rolling magnetization wheel is in direct contact with the steel rail, the magnetic resistance of a magnetization loop can be reduced, the magnetization intensity of the detected steel rail is enhanced and the magnetization depth is increased. Full-coverage magnetization of the upper surface and the side face of the rail head of the steel rail is achieved, magnetic flux leakage detection of the surface and the near surface of the rail head can be finally achieved, and the characteristics of high magnetization capacity and high detection reliability are achieved.

Description

technical field [0001] The invention relates to the technical field of rail non-destructive testing, in particular to a rail non-destructive flaw detection zero lift-off rolling magnetization magnetic flux leakage detection device based on the magnetic flux leakage detection technology. Background technique [0002] Railway transportation plays an important supporting role in my country's economic and social development and modernization construction. It is the main artery of the national economy, key infrastructure and major livelihood projects. In the process of rapid development and large-scale successful application of high-speed railways, operational safety is the basic condition for high-speed railway operations, and a little carelessness will often cause catastrophic safety accidents. Among them, improving the safety and reliability of rail infrastructure is of great importance It is of great significance to ensure the safe and smooth operation of railways. [0003] ...

AI Technical Summary

Problems solved by technology

[0010] In view of the current situation and shortcomings of the existing rail non-destructive testing technology, the purpose of the present invention is to provide a rail magnetic flux leakage detection device based on zero lift-off rolling magnetization to solve the problem of low magnetization efficiency in the existing rail magnetic flux leakage non-destructive testing technology , the stability of the magnetization state is poor, and it is difficult to realize the full coverage detection of the surface of the rail head and the side of the rail head.

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