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Demagnetization method after electromagnetic detection and device using method

An electromagnetic detection and demagnetization technology, applied in circuits, magnetic objects, electrical components, etc., can solve the problems of high equipment cost, inconvenient adjustment, and inconspicuous effects, and achieve the effects of low equipment cost, reliable quality, and simple operation.

Inactive Publication Date: 2013-04-10
WUXI HUAGUANG BOILER
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Problems solved by technology

But this method is inconvenient to adjust, so the final effect is not obvious
[0005] The existing demagnetization device requires two steps of power frequency AC demagnetization and DC demagnetization, which requires high equipment cost, complicated operation and cumbersome maintenance

Method used

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  • Demagnetization method after electromagnetic detection and device using method

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Embodiment Construction

[0015] A demagnetization method after electromagnetic detection, using a common frequency converter available on the market to directly drive the demagnetization coil, and using the function of the frequency converter to adjust the power frequency to the low frequency required for demagnetization, reducing the skin effect of alternating current and maintaining The commutation requirements required for demagnetization are achieved by adjusting the frequency modulation of the inverter to achieve the best demagnetization state. The power of the inverter is selected according to the thickness of the workpiece; the frequency of thick workpieces can be adjusted lower, and the frequency of thin workpieces can be higher. a little. A slightly lower frequency can also be selected for thin workpieces, but it is necessary to ensure that the current in the demagnetization coil is within the rated range of the inverter.

[0016] Specific example of demagnetization: When demagnetizing a Ф60×6 c...

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Abstract

The invention provides a demagnetization method after electromagnetic detection, which has the advantages of low equipment cost, easiness in operation and easiness in maintenance. The demagnetization method is characterized in that a demagnetization coil is directly driven by using a normal frequency converter which is available on the market, wherein power frequency is adjusted to low frequency required by demagnetization by using the function of the frequency converter, so that a skin effect of alternating current is reduced, a reversing requirement required by demagnetization is kept, and an optimal demagnetization state is achieved by adjusting the frequency of the frequency converter; the power of the frequency converter is selected according to thickness of a workpiece; and the frequency can be adjusted to be lower for a thicker workpiece, and higher frequency can be selected for a thinner workpiece.

Description

Technical field [0001] The invention relates to the technical field of demagnetization structures, in particular to a demagnetization method after electromagnetic detection. The invention also provides a device using the method. Background technique [0002] The electromagnetic detection method has been widely used by industrial and mining enterprises. During the detection process, the object under test needs to be subjected to saturation magnetization. It is this process that causes residual magnetism to exist after the inspection of the inspected workpiece. The workpiece needs to be reprocessed after the inspection is qualified. The workpiece with residual magnetism will cause trouble in the subsequent processing and use process, and the subsequent processing cannot be completed in serious cases. For example: workpieces with remanent magnetism will absorb metal powder and chips during processing and use, which will affect the work at a slight degree, and endanger the safe...

Claims

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Application Information

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IPC IPC(8): H01F13/00
Inventor 刘越美
Owner WUXI HUAGUANG BOILER
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