Rotating type low-frequency magnetic-leakage nondestructive flaw detection system

Abstract

The invention discloses a rotating type low-frequency magnetic-leakage nondestructive flaw detection system. The system comprises a Hall element array, a U-shaped magnetic core, an exciting coil, a signal processor, a power module, a single-chip microcomputer, a detection shell, wheels, a track adjusting mechanism, and an upper computer; the single-chip microcomputer outputs a low-frequency AC signal to the exciting coil, magnetizes the U-shaped magnetic core so as to form a magnetic loop with a to-be-detected component; a local magnetic vacuum leakage environment is formed, the magnetic fluxin a detected magnetic conducting component body is leaked to the created magnetic vacuum region at the defect place to form an maximum magnetic leakage field which is sensed by the Hall element arrayat the region; after processing the produced detection electric signal, the signal is sent into the upper computer to process to reflect the damage. The external of the detection device is constructed by adopting a trolley, and the wheel track is adjustable, the movement bypassing the pipeline can be realized, and the rotating type magnetic leakage detection is realized. The system disclosed by the invention is long in detection distance, high in sensitivity and capable of performing rotating detection, and is the innovation based on the magnetic leakage detection principle.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic nondestructive testing, and in particular relates to a rotating low-frequency magnetic flux leakage nondestructive testing system. Background technique [0002] Since American Hawke discovered the prototype of the principle of magnetic flux leakage detection, that is, magnetic particle detection, in 1922, the theory of magnetic flux leakage detection and its engineering application have been extensively studied. [0003] After studying the finite element simulation, Lord and Hwang pointed out that the numerical calculation method is almost the only feasible method for the detection of nonlinear and complex shape defect leakage field. Moreover, the two scholars also studied for the first time the mathematical relationship between the magnetic permeability, the strength of the leakage magnetic field and the strength of the magnetic field in the test piece. [0004] From the perspective of t...

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Problems solved by technology

[0006] The current detectors often have weak leakage magnetic fields of defects, and the magnetic noise caused by the relative posture jitter between the probe and the object always exists, which makes the detection effect mediocre and many detectors can only support non-curved steel plates, etc. detection

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