A magnetic transmission array eddy current probe and method for pipeline defect detection

Abstract

The invention discloses a magnetic transmission type array eddy-current probe aiming at pipeline defect detection and a method. The magnetic transmission type array eddy-current probe comprises an excitation probe device and a detection probe device, wherein the excitation probe device is formed by a permanent magnet framework which can be arranged on the outer wall of a pipeline in a sliding and sleeving way and an excitation coil which is wound on the permanent magnet framework; the detection probe device is formed by a ferromagnetic material framework which can be arranged in the pipeline in the sliding and sleeving way, multiple PVC (Polyvinyl Chloride) frameworks which are in a circular array, circumferential detection coils which are wound on the PVC frameworks and a laser head; multiple circumferential detection coils in the circular array can be used for detecting defects existing in the wall of the pipeline and can be simultaneously used for locating axial and circumferential positions of the defects existing in the wall of the pipeline; the frameworks of the excitation probe device and the detection probe device have magnetic adsorption capacity, so that the situation of ensuring the synchronicity of movement of the excitation coil and the multiple circumferential detection coils along an axial direction of the pipeline can be realized through a non-contact mode. Compared with a conventional non-penetration type eddy-current probe, the magnetic transmission type array eddy-current probe disclosed by the invention has similar detection sensitivity on the defects on the inner wall and the outer wall of the pipeline, and meanwhile, for the defects in larger depth, the problems of signal saturation and impossibility in quantification do not exist.

Description

technical field [0001] The invention relates to an electromagnetic non-destructive testing probe, in particular to a magnetic transmission array eddy current probe and a method for detecting pipeline defects. Background technique [0002] Tubular structures are widely used in various industrial fields such as energy and chemical industry. During long-term use, damage or defects will inevitably occur inside its structure. Since damage or defects can have serious consequences for the safety of pipeline structures, regular non-destructive testing and evaluation are necessary. [0003] The eddy current testing method is based on the phenomenon of electromagnetic induction for defect and damage detection. It has the advantages of high detection ability for surface and near-surface shallow defects, non-contact, fast scanning, etc. It is a method for surface / near-surface defects of this pipeline structure. An efficient method for quantitative nondestructive evaluation. However, ...

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Problems solved by technology

[0004] In order to solve the problems existing in the above-mentioned prior art, the object of the present invention is to provide a magnetic transmission type array eddy current probe and method for pipeline defect detection. The permanent magnet skeleton of the excitation coil drives the ferromagnetic material skeleton of the detection coil in the ring to make the excitation The coil and 12 circular array detection coils always maintain the synchronization of movement in the axial direction of the pipeline. In addition, the circumferential positioning of the pipe wall defects is realized through 12 PVC skeletons and the circumferential detection coils wound on the PVC skeleton. ; In addition, since the excitation coil and the detection coil are respectively distributed on the outer wall and inner wall of the pipeline, it is a penetrating eddy current probe. Compared with the conventional non-penetrating eddy current probe, it has similar detection sensitivity to defects on the inner and outer walls of the pipeline. At the same time, for deep defects, there is no problem of signal saturation and quantification

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