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Magnetic flux leakage detection device and magnetic flux leakage detection method

A technology of magnetic flux leakage detection and magnetic force, which is applied in the direction of material magnetic variables, etc., can solve the problems of difficult to achieve saturation magnetization, high missed detection rate, and low missed detection rate, so as to improve magnetization efficiency, low missed detection rate and reduce missing The effect of detection rate

Active Publication Date: 2021-08-17
TSINGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, the present invention proposes a magnetic flux leakage detection device, which can detect defects in multiple directions, has a low missed detection rate, and is small in size, which solves the problem of the magnetic flux leakage detection device with U-shaped excitation structure in the prior art. Difficult to achieve saturation magnetization and technical problems of large size and high missed detection rate

Method used

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  • Magnetic flux leakage detection device and magnetic flux leakage detection method
  • Magnetic flux leakage detection device and magnetic flux leakage detection method
  • Magnetic flux leakage detection device and magnetic flux leakage detection method

Examples

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Embodiment 1

[0111] A magnetic flux leakage detection device 1000, such as figure 1 As shown, it includes: an excitation assembly 100 and four sensor assemblies 200 .

[0112] Among them, such as figure 1 As shown, the excitation assembly 100 is used to magnetize the object to be tested 2000, including: a first magnetic transmission part 110, a magnetic force assembly 120 and a second magnetic transmission part 130, the first magnetic transmission part 110 is hollow inside, and the magnetic force assembly 120 is nested in In the first magnetic transmission part 110, the magnetic force assembly 120 is spaced apart from the first magnetic transmission part 110 in the circumferential direction. The first lower end surface of the first magnetic transmission part 110 is coplanar with the second lower end surface of the first magnetic transmission part 110, and both the first lower end surface and the second lower end surface are fitted on the surface of the test piece 2000, and the second magn...

Embodiment 2

[0118] A magnetic flux leakage detection device 1000, such as image 3 As shown, it includes: an excitation assembly 100 and four sensor assemblies 200 .

[0119] Among them, such as image 3 As shown, the excitation assembly 100 is used to magnetize the object to be tested 2000, including: a first magnetic transmission part 110, a magnetic force assembly 120 and a second magnetic transmission part 130, the first magnetic transmission part 110 is hollow inside, and the magnetic force assembly 120 is nested in In the first magnetic transmission part 110, the magnetic force assembly 120 is spaced apart from the first magnetic transmission part 110 in the circumferential direction. The first lower end surface of the first magnetic transmission part 110 is coplanar with the second lower end surface of the first magnetic transmission part 110, and both the first lower end surface and the second lower end surface are fitted on the surface of the test piece 2000, and the second magn...

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Abstract

The invention discloses a magnetic flux leakage detection device and a magnetic flux leakage detection method. The magnetic flux leakage detection device comprises an excitation assembly and a sensor assembly, the excitation assembly is used for magnetizing a to-be-tested piece and comprises a magnetic transmission piece and a magnetic force assembly, the interior of the first magnetic transmission piece is hollow, and the magnetic force assembly is embedded in the first magnetic transmission piece; the magnetic assembly and the first magnetic transmission piece are arranged at an interval, the first upper end face of the magnetic assembly and the second upper end face of the first magnetic transmission piece are coplanar, the first lower end face of the magnetic assembly and the second lower end face of the first magnetic transmission piece are coplanar, and the two lower end faces are both matched on the surface of a to-be-tested piece. The second magnetic transmission piece is simultaneously connected with the first upper end face and the second upper end face, the sensor assembly is arranged between the first magnetic transmission piece and the magnetic assembly, the sensor assembly is arranged on the magnetic assembly close to the first lower end face, and the sensor assembly is used for detecting defects on the to-be-tested piece. The magnetic flux leakage detection device provided by the embodiment of the invention can detect defects in multiple directions, and is high in detection capability and low in omission ratio.

Description

technical field [0001] The invention belongs to the technical field of magnetic flux leakage non-destructive testing, in particular to a magnetic flux leakage detection device and a magnetic flux leakage detection method. Background technique [0002] Magnetic flux leakage detection technology is a safe and efficient detection technology. It has the advantages of no coupling agent, simple principle, and little influence from harsh detection environments such as oil pollution. It is widely used in nondestructive testing of ferromagnetic materials. Especially, it plays an irreplaceable role in the ex-factory inspection of steel pipes and steel plates and the in-service non-destructive inspection of storage tank floors and oil and gas pipelines. [0003] The key to magnetic flux leakage detection is to saturate and magnetize ferromagnetic materials. In the existing magnetic flux leakage detection technology for steel plates, yoke-type magnetization is generally used for the mag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/83
CPCG01N27/83
Inventor 韩赞东欧正宇张瑛
Owner TSINGHUA UNIV
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