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

A technology for magnetic flux leakage detection and defect depth, 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 depth is also crucial to the evaluation of the damage of the measured workpiece, and different defect depths may affect the grinding and replacement of the workpiece

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

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Embodiment Construction

[0020] The invention discloses a method for detecting the depth of rail defects 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;

[0021] Both the first caster and the second caster are wide 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;

[0022] 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 send a magnetic signal toward 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 to collect magnetic flux leakage signals;

[0023] The ...

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Abstract

The invention discloses a steel rail defect depth 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 Z direction; secondly, carrying out band-pass filtering and amplification processing on the two magnetic flux leakage signals by utilizing a blocking method to obtain a signal time domain distribution diagram in the X direction and a signal time domaindistribution diagram in the Z direction; thirdly, extracting peak values of defect signals in the signal time domain distribution diagrams in the X direction and the Z direction to serve as signal eigenvalues in the X direction and the Z direction; and finally, by utilizing a relation between an X-direction defect depth and an X-direction eigenvalue BX, and a relation between a Z-direction defectdepth and a Z-direction eigenvalue BZ, performing calculation to obtain the defect depths in the X direction and the Z direction. The defect signals of different depths can be quantitatively analyzedon 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 depth 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 depth of rail defects. The leakage magnetic field intensity at the defect is closely related to the size of the defect, the strength of the internal magnetic field of the workpiece to be tested, and the distance between the sensor and the surface of the workpiece to be measured, that is, the lift-off value, etc. These factors will affect the sensitivity and reliability of detection at the same time. Reasonable selection of the above parameters is very important to obtain the best detection results. The measurement of defect depth is also crucial to the evaluation of the damage of the measured workpiece, and different defe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/83G01B7/26
CPCG01B7/26G01N27/83
Inventor 冀凯伦王平熊师洵朱雨微刘骕骐常辉光
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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