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High-speed rail wheel electromagnetic tomography flaw detection method and device

A technology of electromagnetic tomography and high-speed rail, applied in the direction of material magnetic variables, etc., can solve the problems of high cost of radiographic flaw detection, high requirements for staff, and radiation, and achieve the effects of rapid on-site detection, easy portability, and easy use

Inactive Publication Date: 2019-04-30
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, magnetic particle detection needs to adjust the magnetization current, and after the detection is completed, it needs to demagnetize and clean the wheels, which is not only inefficient, but also has high requirements for staff and high labor intensity.
Radiographic inspection is expensive and has radiation, which is not suitable for complex industrial field applications

Method used

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  • High-speed rail wheel electromagnetic tomography flaw detection method and device
  • High-speed rail wheel electromagnetic tomography flaw detection method and device
  • High-speed rail wheel electromagnetic tomography flaw detection method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0043] figure 1 It is the schematic diagram of the high-speed rail wheel electromagnetic tomography flaw detection device of the present embodiment, referring to figure 1 , the device includes: a signal generating device and a signal transmission processing device.

[0044]The signal generating device includes a U-shaped electromagnetic tomography sensor bracket and an electromagnetic coil, and the electromagnetic coil is evenly installed in the U-shaped electromagnetic tomography sensor bracket, and is used to transmit the signal according to the signal transmission processing device, Collect the induced voltage signal of the high-speed rail wheel. When in use, the U-shaped electromagnetic tomography sensor bracket is fixedly installed on the flaw detection platform to detect the rim, tread and rim of the high-speed rail wheel. image 3 It is a schematic diagram of U-shaped electromagnetic tomography sensor bracket, refer to image 3 , there are 2n grooves on the U-shaped ...

Embodiment 2

[0060] Electromagnetic tomography is a new type of electrical tomography based on the principle of electromagnetic induction. By applying multi-frequency excitation signals to the excitation coil, an alternating excitation main magnetic field will be generated in the measured object field. It will generate multi-frequency eddy currents in the measured object, and the eddy currents will induce secondary magnetic fields. The secondary magnetic field is coupled with the main magnetic field to generate a distorted magnetic field. The distorted magnetic field acts on the detection coil, and a voltage signal is induced on the detection coil. Each coil is excited in turn, and the other coils are detected in turn, so that the projection data in all directions can be obtained. Finally, a suitable image reconstruction algorithm is used to reconstruct the defect distribution of the cross-section of the high-speed rail wheel.

[0061] Figure 5 This embodiment provides a flow chart of...

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Abstract

The invention provides a high-speed rail wheel electromagnetic tomography flaw detection method and device. The device comprises a signal generating device and a signal transmitting and processing device; the signal generating device comprises a U-shaped electromagnetic tomography sensor support and electromagnetic coils, and the electromagnetic coils are evenly installed in the U-shaped electromagnetic tomography sensor support and used for collecting induced voltage signals of high-speed rail wheels according to the signals transmitted by the signal transmitting and processing device; the signal transmitting and processing device generates an alternating sine excitation signal with a fixed frequency phase through an excitation signal generation module; a power amplification module amplifies the excitation signal, a channel switching module performs gating switching on an electromagnetic coils, a signal conditioning module amplifies and filters induced voltage signals output by the electromagnetic coils, and finally the induced voltage signals are collected to a data processing display module through a data collection module to be processed. According to the invention, high-speed,on-line, effective and non-contact rapid on-site detection can be realized.

Description

technical field [0001] The invention relates to the field of non-destructive flaw detection of high-speed rail wheels, in particular to an electromagnetic tomography flaw detection method and device for high-speed rail wheels. Background technique [0002] As the most important component of a high-speed train, the wheel is responsible for transferring the load on the vehicle to the rail. When the locomotive brakes, it also bears the role of the brake disc. Therefore, the high-speed train wheel works under a very complicated stress state. Especially for trains with a speed of 350 km / h, the wheels are under enormous pressure, so the quality of their production is directly related to the operation safety of the high-speed rail and the safety of life and property of passengers. [0003] Due to the rapid spread of cracks on the surface of the wheel, it is easy to cause failures such as fatigue cracks on the wheel, and even cause the wheel to collapse, resulting in a major safety ...

Claims

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Application Information

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IPC IPC(8): G01N27/83
CPCG01N27/83
Inventor 刘泽刘向龙李勇岳远里武建利
Owner BEIJING JIAOTONG UNIV
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