A non-destructive testing device for rail based on magnetic flux leakage and induced current

Abstract

The invention discloses a leakage flux and induction current based rail nondestructive testing device which comprises a guide magnet, permanent magnets, magnetism sensitive sensors, a signal conditioning circuit, a capture card and a computer, wherein the guide magnet has an arc-shaped structure; the permanent magnets are arranged at the two ends of the guide magnet; the magnetism sensitive sensors are arranged on the lower end faces of the permanent magnets and in the middle of the guide magnet; the permanent magnets arranged at the two ends of the guide magnet in the manner of opposite pole directions, a detected rail and the guide magnet form a closed magnetization loop; the magnetism sensitive sensors, the signal conditioning circuit, the capture card and the computer are successively connected with each other; when the testing device is under the running condition, the magnetism sensitive sensors can collect the change signals of an electromagnetic field of the rail and convert the change signals of electromagnetic field into electric signals, the electric signals are amplified and filtered through the signal conditioning circuit, and then the capture card is used for performing A / D conversion, and the signals are supplied to the computer for analysis and treatment, so that the defect information of the rail is acquired. The leakage flux and induction current based rail nondestructive testing device can be used for quickly and nondestructively testing the horizontal, longitudinal, inner and outer defects of the rail, is simple in structure and is low in manufacturing cost.

Description

Technical field [0001] The invention relates to the field of nondestructive testing, in particular to a rail nondestructive testing device based on magnetic flux leakage and induced current, which can simultaneously realize high-speed nondestructive testing of rail horizontal / longitudinal and internal / external defects. Background technique [0002] With the rapid advancement of the domestic high-speed rail network and the gradual implementation of the "high-speed rail going abroad" strategy, high-speed railways have developed rapidly. At present, the running speed of high-speed trains in use in my country is 200-350km / h, and the test speed of the CIT500 high-speed train manufactured by CSR in early 2014 reached 605km / h. Operational safety is the basic condition of high-speed railway operation. A little carelessness will often cause catastrophic safety accidents. Among them, the state of the rails is directly related to transportation safety. Currently, rail nondestructive testin...

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a non-destructive testing device for rails based on magnetic flux leakage and induced current to solve the existing problems of non-destructive testing devices for rails in the prior art, such as slow detection speed, inability to detect internal defects, or inability to simultaneously realize cross-sectional / The problem of comprehensive detection of longitudinal defects

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