CN103743812A - Design method for improving magnetic powder inspection capacity through simultaneous excitation at plurality of frequencies - Google Patents
Design method for improving magnetic powder inspection capacity through simultaneous excitation at plurality of frequencies Download PDFInfo
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- CN103743812A CN103743812A CN201410024547.5A CN201410024547A CN103743812A CN 103743812 A CN103743812 A CN 103743812A CN 201410024547 A CN201410024547 A CN 201410024547A CN 103743812 A CN103743812 A CN 103743812A
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Abstract
The invention discloses a design method for improving the magnetic powder inspection capacity through the simultaneous excitation at a plurality of frequencies. Magnet yoke coils are simultaneously excited by using excitation currents with a plurality of different frequencies based on the principle that induced magnetic fields generated by the excitation currents with the different frequencies have different magnetization deeps for an inspected workpiece, so that the inspected workpiece is comprehensively and uniformly magnetized, defective leakage magnetic fields on the surface and the inner part of the inspected workpiece are favorably escaped, magnetic powder is easy to gather, and therefore, the defect checkout capacity of the magnetic powder is greatly improved.
Description
Affiliated technical field
The present invention relates to a kind of method for designing of the cannot-harm-detection device, particularly relate to a kind of method for designing that adopts a plurality of frequencies excitation raising simultaneously magnetic powder inspection ability.
Background technology
It is the conventional lossless detection method that ferromagnetic workpiece fault in material detects that magnetic detects, and needs first, by tested workpiece magnetizing, then magnetic uniform spreading to be detected in the detection faces of tested workpiece in testing process again.In testing process, the magnetization effect of tested workpiece directly has influence on the precision and detection effect that magnetic detects, and tested workpiece magnetizing is more even, and accuracy of detection is better with detection effect.Conventional Magnitizing method has DC magnetization and ac magnetization method, and after DC magnetization method need to detect, to the processing of demagnetizing of tested workpiece, ac magnetization is processed without demagnetization.Ac magnetization adopts the magnetization current excitation yoke coil of single-frequency to produce induced field, the tested workpiece in magnetization induced field more at present.But the magnetization current of single-frequency has certain magnetization degree of depth, for some large-scale tested workpiece, tested workpiece is difficult to obtain comprehensive uniform magnetization, affects magnetic and detects effect.There is in recent years the method that adopts converter technique to change the frequency of magnetization current, referring to patent of invention CN201110355108.9, but the method can only excite a kind of magnetization current of frequency at every turn, can not take into account all degree of depth, also cannot realize comprehensive uniform magnetization of tested workpiece.
Summary of the invention
The object of the invention is to overcome the deficiency of prior art, a kind of method for designing that adopts a plurality of frequencies excitation raising simultaneously magnetic powder inspection ability is provided, the induced field principle different to the magnetization degree of depth of tested workpiece that exciting current based on different frequency produces, adopt the exciting current of a plurality of different frequencies to encourage yoke coil simultaneously, tested workpiece is obtained and magnetize more uniformly effect.
The technical solution adopted for the present invention to solve the technical problems is: the magnetizing exciter in AC excitation magnetic powder inspection instrument adopts the phase-locked power amplifier that can simultaneously excite a plurality of different frequency exciting currents; Power amplifier excites the exciting current of a plurality of different frequencies to encourage yoke coil simultaneously, the induced field that the exciting current excitation yoke coil of different frequency produces is different to the length of penetration of tested workpiece, it is the degree of depth difference that tested workpiece is magnetized, thus, can make tested surface of the work and inner acquisition magnetize more uniformly and effectively effect, be conducive to the effusion of tested surface of the work and inherent vice stray field, magnetic is more easily assembled, thereby improve the Detection capability to defect.
The invention has the beneficial effects as follows, a kind of method for designing that adopts a plurality of frequencies excitation raising simultaneously magnetic powder inspection ability is provided, the induced field principle different to the magnetization degree of depth of tested workpiece that exciting current based on different frequency produces, adopt the exciting current of a plurality of different frequencies to encourage yoke coil simultaneously, tested workpiece is obtained and magnetize more comprehensively, uniformly effect, greatly improve thus accuracy of detection and detection effect that magnetic detects.
Below in conjunction with embodiment, the present invention is described in further detail, but a kind of method for designing of a plurality of frequencies excitation raising simultaneously magnetic powder inspection ability that adopts of the present invention is not limited to embodiment.
Embodiment
Embodiment, magnetizing exciter in AC excitation magnetic powder inspection instrument adopts the phase-locked power amplifier that can simultaneously excite a plurality of different frequencies (for example 5Hz, 50Hz, 100Hz etc.) exciting current.In testing process, magnetic or magnetic flaw detection ink are sprinkling upon in the plane was seized of tested workpiece equably, power amplifier excites the exciting current of a plurality of different frequencies to encourage yoke coil simultaneously, because the induced field that the exciting current excitation yoke coil of different frequency produces is different to the length of penetration of tested workpiece, it is the degree of depth difference that tested workpiece is magnetized, therefore, can make tested surface of the work and inner acquisition magnetize more uniformly and effectively effect.Then observe the magnetic trace in plane was seized, judge tested workpiece, defect situation.Method for designing of the present invention be conducive to tested surface of the work and inherent vice stray field effusion, magnetic is more easily assembled, thereby improve the Detection capability to defect.
Above-described embodiment is only used for further illustrating a kind of method for designing that adopts a plurality of frequencies excitation raising simultaneously magnetic powder inspection ability of the present invention; but invention is not limited to embodiment; any simple modification, equivalent variations and modification that every foundation technical spirit of the present invention is done above embodiment, all fall in the protection domain of technical solution of the present invention.
Claims (1)
1. a method for designing that adopts a plurality of frequencies excitation raising simultaneously magnetic powder inspection ability, is characterized in that: the magnetizing exciter in AC excitation magnetic powder inspection instrument adopts the phase-locked power amplifier that can simultaneously excite a plurality of different frequency exciting currents; Power amplifier excites the exciting current of a plurality of different frequencies to encourage yoke coil simultaneously, the induced field that the exciting current excitation yoke coil of different frequency produces is different to the length of penetration of tested workpiece, it is the degree of depth difference that tested workpiece is magnetized, thus, can make tested surface of the work and inner acquisition magnetize more uniformly and effectively effect, be conducive to the effusion of tested surface of the work and inherent vice stray field, magnetic is more easily assembled, thereby improve the Detection capability to defect.
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| CN201410024547.5A CN103743812B (en) | 2014-01-20 | 2014-01-20 | A kind of method for designing using multiple frequency excitation simultaneously to improve magnetic powder inspection capacity |
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| CN201410024547.5A CN103743812B (en) | 2014-01-20 | 2014-01-20 | A kind of method for designing using multiple frequency excitation simultaneously to improve magnetic powder inspection capacity |
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| CN103743812A true CN103743812A (en) | 2014-04-23 |
| CN103743812B CN103743812B (en) | 2016-08-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110470726A (en) * | 2019-08-14 | 2019-11-19 | 中国特种设备检测研究院 | Steel pipe defect inspection method and device based on multifrequency electromagnetism |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110470726A (en) * | 2019-08-14 | 2019-11-19 | 中国特种设备检测研究院 | Steel pipe defect inspection method and device based on multifrequency electromagnetism |
| CN110470726B (en) * | 2019-08-14 | 2023-03-07 | 中国特种设备检测研究院 | Steel pipeline defect detection method and device based on multi-frequency electromagnetism |
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| CN103743812B (en) | 2016-08-24 |
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