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Steel rail defect width detection method based on magnetic flux leakage detection device

A technology for magnetic flux leakage detection and defect width, applied in the field of measurement technology and instruments, can solve problems affecting workpiece grinding and replacement, and achieve the effect of accurate damage and serious damage and accurate judgment.

Inactive Publication Date: 2018-12-21
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

The measurement of defect width is also crucial to the evaluation of the damage of the measured workpiece, and different defect widths may affect the grinding and replacement of the workpiece

Method used

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  • Steel rail defect width detection method based on magnetic flux leakage detection device

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Embodiment Construction

[0022] The invention discloses a method for detecting the width of a rail defect based on a magnetic flux leakage detection device, such as figure 1 As shown, the magnetic flux leakage detection device includes a housing, a yoke, an excitation coil, a Hall sensor array, a first caster and a second caster;

[0023] Both the first caster and the second caster use wide rubber wheels, which are respectively arranged on the lower end surface of the housing, so that the housing can roll on the rail to be detected;

[0024] The yoke, the excitation coil, and the Hall sensor array are all arranged in the housing, wherein the yoke is in an inverted U shape, the excitation coil is wound on it, and the excitation coil is connected to an external power supply. The yoke is used to form a magnetic circuit with the rail to be detected when the excitation coil is energized; the Hall sensor array is arranged in the yoke and parallel to the rail, and is used to collect magnetic flux leakage sig...

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Abstract

The invention discloses a steel rail defect surface included angle detection method based on a magnetic flux leakage detection device. The method comprises the steps of firstly, placing the magnetic flux leakage detection device on a to-be-detected steel rail, and measuring magnetic flux leakage signals of the to-be-detected steel rail in the X direction and the Y direction; secondly, carrying outband-pass filtering and amplification processing on the two magnetic flux leakage signals to obtain a signal time domain distribution diagram in the X direction and a signal time domain distributiondiagram in the Y direction; thirdly, extracting peak intervals of defect signals in the signal time domain distribution diagrams in the X direction and the Y direction to serve as signal eigenvalues in the X direction and the Y direction; and finally, by utilizing a relation between an X-direction defect width Wx and an X-direction eigenvalue peak interval BX and a relation between a Y-direction defect width Wy and a Y-direction eigenvalue peak interval BY, performing calculation to obtain defect depths in the X direction and the Y direction. According to the method, the defect signals of different widths can be quantitatively analyzed on the basis that only the magnetic flux leakage signals can be detected originally, so that the damage severity situation can be judged more accurately.

Description

technical field [0001] The invention relates to the field of measurement technology and instruments, in particular to a method for detecting the width of rail defects based on a magnetic flux leakage detection device. Background technique [0002] At present, non-destructive magnetic flux leakage testing has become one of the main methods for detecting the width of rail defects. The basic principle of magnetic flux leakage testing in non-destructive testing is that after the ferromagnetic material is partially magnetized, in the local magnetized area, if the material has cracks or For damage such as pits, the distribution of the magnetic field at the damage will change suddenly, and some of the magnetic field will leak out to form a leakage magnetic field. By detecting the change of the magnetic field in this part of the ferromagnetic material, it can be judged whether there is damage in this part of the material. [0003] The leakage magnetic field intensity at the defect i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/83G01B7/02
CPCG01B7/02G01N27/83
Inventor 熊师洵王平冀凯伦朱雨微刘骕骐梁康武
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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