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A magnetic flux leakage detector with a magnetic cover

A technology of detectors and magnetic covers, applied in the direction of material magnetic variables, etc., can solve problems such as poor magnetic flux leakage signals, and achieve the effects of reducing electromagnetic interference, reducing stray magnetic fields, and increasing signal magnetic fields

Active Publication Date: 2017-06-23
TOMATO TECH WUHAN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above problems, the object of the present invention is to provide a magnetic flux leakage detector with a magnetic cover, aiming to solve the technical problem that using a flat soft magnetic material to attract magnetic flux leakage to increase the magnetic flux leakage signal is not effective

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  • A magnetic flux leakage detector with a magnetic cover
  • A magnetic flux leakage detector with a magnetic cover
  • A magnetic flux leakage detector with a magnetic cover

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Embodiment approach

[0030] Further as a preferred embodiment, the magnetic flux leakage detector also includes a mounting bracket (not shown in the figure) for fixing the magnetic cover, and the mounting bracket is made of a non-magnetic material, such as copper . In actual measurement, it is also possible to give the magnetic cover an up and down cycle amplitude, that is, to make the thickness of the air gap change periodically, forming different amplification effects on magnetic flux leakage, which can be used to judge the depth and size information of defects. For this reason, preferably, a vibration source (not shown in the figure) is installed directly above the magnetic cover, and the vibration source is used to drive the magnetic cap to vibrate periodically up and down. The vibration source is installed on the magnetic cover, which can effectively avoid the electromagnetic interference of the vibration source.

[0031] To sum up, the magnetic cover of the present invention can obviously s...

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Abstract

The present invention is applicable to the field of magnetic flaw detection, and provides a magnetic flux leakage detector with a magnetic cover, including an excitation unit, a magnetic sensitive element arranged inside the excitation unit, and a cap-shaped magnetic The cover is made of soft magnetic material with high magnetic permeability. The magnetic cover of the present invention can shield the stray magnetic field of the excitation unit, reduce the Barkhausen noise, increase the characteristic flux leakage magnetic field of the defect, including the characteristic flux leakage magnetic field of the defect in the parallel direction and the vertical direction, and can adjust the size of the defect Filter and categorize. Supporting the use of high-sensitivity magnetic sensitive elements or magnetic sensitive arrays can improve the existing magnetic flux leakage detection level and detection speed, especially suitable for the detection of high-speed rail subway rails, pipelines, plates, ships, storage tanks and large equipment.

Description

technical field [0001] The invention belongs to the technical field of magnetic flaw detection, and in particular relates to a magnetic flux leakage detector with a magnetic cover, which is especially suitable for online nondestructive testing of high-speed rail, subway rails, pipelines, plates, ships, storage tanks, and large-scale equipment. Background technique [0002] The existing rail damage detection, including the damage detection of high-speed rail and subway rails, mainly uses ultrasonic detection technology. The principle of this technology is to use the reflection of ultrasonic waves on the surface of the defect, the position of the defect can be indirectly estimated through the reflection time and the speed of sound, and the size of the defect can be indirectly estimated through the reflected waveform. The downside of this technique is its insensitivity to tiny defects and its indirect measurement of defect size, shape and location. [0003] Magnetic flux leaka...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/82
Inventor 卢永雄刘润浥吴路明
Owner TOMATO TECH WUHAN
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