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Steel tube broadband magnet yoke flaw detection method and apparatus thereof

A technology of flaw detection and magnetic yoke, which is applied in the direction of material magnetic variables, etc., to achieve high work efficiency, high precision and good results

Inactive Publication Date: 2013-11-27
SHEYANG SAIFU NDT EQUIP MFG
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  • Abstract
  • Description
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  • Steel tube broadband magnet yoke flaw detection method and apparatus thereof
  • Steel tube broadband magnet yoke flaw detection method and apparatus thereof

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[0014] As shown in the figure, the magnetic yoke includes U-shaped main iron core 1, guide iron core 2, magnetic rubber 3, steel pipe 4, coil 5, vertical section 1-1 of U-shaped main iron core, and horizontal section of U-shaped main iron core. Section 1-2, connecting piece 6.

[0015] A steel pipe broadband magnetic yoke flaw detection method, the magnetization unit flows an alternating current as an excitation current and applies it to the yoke, the yoke is in contact with the steel pipe surface, the magnetized area of ​​the steel pipe is sprayed by a magnetic powder liquid sprayer, and the image acquisition device sprays the magnetic powder on the steel pipe. The image acquisition device includes a camera and a light source; the light source is an ultraviolet lamp. Including the magnetization unit, the magnetization unit includes a magnetization power supply and a yoke, and the yoke includes a U-shaped main iron core, a guide iron core, and the difference between the cross-...

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Abstract

A steel tube broadband magnet yoke flaw detection method is characterized in that an AC current is circulated on a magnetization unit and is applied to a magnet yoke as an exciting current, the magnet yoke contacts with the surface of a steel tube, the magnetized area magnetic powder liquid spray thrower of the steel tube sprays, an image acquisition device acquires the magnetic powder spray area of the steel tube, and the image acquisition device comprises a camera and a light source; the magnetization unit comprises a magnetization power supply and the magnet yoke, the magnet yoke comprises a U-shaped main iron core and a guiding iron core, a difference between the cross-sectional area of the main iron core and the cross-sectional area of the guiding iron core is less than 20% of the total area of the main iron core and the guiding iron core, at least two coils are arranged, at least one coil is wound on the two arms of the U0shaped main iron core, and the coils have a same connecting direction; and the end portion of the guiding iron core is bonded with magnetic rubber having a thickness of 3-20mm, the magnetic rubber is parallel to the cross section of the guiding iron core, and the area of the magnetic rubber is above 150% of the cross-sectional area of the guiding iron core.

Description

technical field [0001] The invention relates to a magnetic flaw detection method and a magnetic flaw detection device, in particular to a method and a device for automatic detection of broadband yoke flaw detection of steel pipes. Background technique [0002] Steel pipes and (steel rods) are bulk products that need to be tested, and each steel pipe or steel rod needs to be tested. The existing technology such as CN200980117371 provides a magnetic flaw detection method and a magnetic flaw detection device. The magnetic flaw detection device has: circumferential induction magnetization The compound magnetization unit and the longitudinal induction magnetization unit use the phase relationship of 120 degrees of the three-phase power supply to form a rotating magnetic field and act on the workpiece to be inspected; the detection unit detects the flaw detection signal; and the signal processing unit implements the flaw detection signal signal processing. The magnetizing unit fl...

Claims

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Application Information

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IPC IPC(8): G01N27/84
Inventor 杨建陈志华夏树新崇庆高杨乾明
Owner SHEYANG SAIFU NDT EQUIP MFG
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