Pulse leakage railway rail detecting system and detecting method thereof

Abstract

The invention discloses a detection system of a pulsed magnetic flux leakage rail and a detection method thereof, and belongs to the rail non-destructive test field. The structure of the detection system comprises a sensor module, a signal conditioning module, a data acquisition module, a signal stimulating module, a computer processing module and a coded disc position acquisition module; a U-shaped magnetic yoke coil exerts magnetic field excitation on a tested rail, magnetic force line distribution is generated between the tested rail and a coil magnetic yoke, the surface of the rail cracks, the distribution of the magnetic force line changes due to the existence of cracks near the cracks on the surface of the rail, and generates magnetic flux leakage; and square-wave signals with adjustable frequency are exerted on an exciting coil by the impulse excitation technology so that the magnetic flux leakage situation is applicable to the cracks with different depths. The system and the method perform non-contact type non-destructive test on the rail surface and shallow surface cracks, the device has a simple structure and the system has high reliability.

Description

technical field [0001] The invention relates to a rail detection system, in particular to a pulse leakage magnet rail detection system and a detection method thereof, belonging to the field of non-destructive detection of rails. Background technique [0002] Before my country's railway speed-up, the damage of the rails under low-speed operation is mainly caused by scratches, pitting, and scale-like peeling, which are distributed on the surface and have a high probability of being ground flat during continuous operation. The main cause of the damage is surface extrusion. pressure injury. However, after my country's railway speeds up and enters the development stage of high-speed railways, the damage conditions of high-speed railways are different from those of low-speed railways. High-speed railways are prone to cracks that develop deep and usually do not cause surface peeling, but the probability of eventually forming a fracture failure is greatly increased. The cause of cra...

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Problems solved by technology

Among them, the ray type is difficult to be used in the on-line detection application of the track due to the reasons such as difficult preparation of detection equipment, difficulty in radioactive operation, and difficulty in realizing on-line detection; while the usual ultrasonic type is difficult to achieve non-contact measurement due to the need for coupling. In addition, the equipment structure is relatively complex, which makes it difficult to meet the high reliability requirements of online detection.

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