Anti-interference magnetic powder flaw detector for outdoor use

Abstract

The invention relates to an anti-interference magnetic powder flaw detector for outdoor use. The device comprises a platform, an annular plate, a cover plate, a controller, a magnetic powder box, a cleaning mechanism, a lifting mechanism, two magnetizers and four supporting legs, the lifting mechanism comprises a bottom plate, a supporting plate and two lifting assemblies, every lifting assembly comprises an orientation rod, a driving unit, a plurality of sliding rings and a plurality of first connecting rods, and the cleaning mechanism comprises a first motor, a first driving shaft, a turntable, a washing assembly, a drying assembly, a second motor, a second driving shaft, two translating assemblies and two fixing rods. The lifting mechanism drives a workpiece on the supporting plate to move to a closed interval formed by the annular plate and the cover plate to prevent the magnetic powder distribution from being affected by wind, so the device can run outdoors; and oil stains on thesurface of the workpiece are removed by the cleaning mechanism to prevent the magnetic powder distribution from being interfered, so a magnetic trace is correctly displayed, and the practicability ofthe device is improved.

Description

technical field [0001] The invention relates to the field of detection instruments, in particular to an outdoor magnetic particle flaw detection device with an anti-interference function. Background technique [0002] Magnetic particle flaw detection uses the interaction between the leakage magnetic field at the defect of the workpiece and the magnetic powder, and through the difference between the magnetic permeability of the surface and near-surface defects (such as cracks, slag inclusions, hairlines, etc.) of steel products and the magnetic permeability of steel, these materials are magnetized The magnetic field at the discontinuity will be distorted, forming a leakage magnetic field on the surface of the workpiece at the part of the magnetic flux leakage, thereby attracting the magnetic powder to form the magnetic powder accumulation at the defect, that is, the magnetic mark, showing the position and shape of the defect under appropriate lighting conditions. The accumula...

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Problems solved by technology

[0003] When performing magnetic particle testing, it is necessary to ensure that the magnetic powder adheres to the vicinity of the depression of the workpiece. However, when the existing magnetic particle testing device is used outdoors, it is affected by the external wind force. Detection errors, not only that, there will be oil stains on the surface of the workpiece. These oil stains have a certain viscosity to the magnetic powder, which will interfere with the distribution of the magnetic powder and make the display of magnetic marks wrong, thus reducing the practicability of the existing magnetic particle flaw detection device.

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