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Tilted axial array circumferential eccentric eddy current probe and method for detection of small-diameter pipes

A technology of eddy current probe and small-diameter tube, which is applied in the field of electromagnetic non-destructive testing probe, can solve the problems of high cost, low probe resolution, missed detection, etc., and achieve the effect of improving work efficiency, high detection ability and improving efficiency

Active Publication Date: 2022-05-06
XI AN JIAOTONG UNIV +1
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  • Description
  • Claims
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Problems solved by technology

However, for small-diameter tubes, due to the limited space in the tube, it is difficult to accommodate the traditional circumferential array probe, so there are problems of difficult design and high cost of the traditional circumferential array probe; on the other hand, due to the lack of space in the small-diameter tube The number is limited, the circumferential spatial resolution of the probe will be seriously reduced, and there is a problem of missed detection

Method used

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  • Tilted axial array circumferential eccentric eddy current probe and method for detection of small-diameter pipes
  • Tilted axial array circumferential eccentric eddy current probe and method for detection of small-diameter pipes
  • Tilted axial array circumferential eccentric eddy current probe and method for detection of small-diameter pipes

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Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] As shown in Figure 1, this embodiment is an inclined axial array circumferential eccentric eddy current probe for detection of small-diameter pipes. The enameled wire from mm to 0.1mm is wound on the skeleton 1 and spirally wound to 200 to 600 turns to form independent coils 2. The axial distance between all coils 2 is 2mm, and the axial height of the coils is 3mm.

[0025] Such as Figure 2a and Figure 2b As shown, the cylindrical frame 1 of the inclined axial array circumferential eccentric eddy current probe has a groove structure for winding the coil 2, the angle between the groove section and the probe axis is 45°, and the inclination directions of all the grooves are consistent, as shown in Figure 3a As shown, set the axis of all coils 2 to have an eccentric distance of 1mm from the axis of the probe; Figure 3b , ...

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Abstract

An oblique axial array circumferential eccentric eddy current probe and method for detection of small-diameter pipes, the eddy current probe includes a cylindrical skeleton, and the cylindrical skeleton is provided with a plurality of oblique grooves arranged at equal intervals along the axial direction, and the opening of the grooves There are cylindrical parts remaining in the position, and the axis of each cylindrical part has the same eccentric distance from the axis of the cylindrical skeleton; at the same time, the angle between the line connecting the two axes and the horizontal plane is the ring of the groove The distribution angle, which makes all the grooves evenly distributed in the circumferential direction of 360°; the number of grooves is determined by the detection requirements and accuracy; it also includes mutually independent coils wound in each groove of the cylindrical skeleton; The outer diameter of the eddy current probe and the inner diameter of the small-diameter tube to be tested meet the requirements for detecting the filling rate during work; the invention also discloses the detection method of the probe; the eddy current probe only needs to scan once in the small-diameter tube to be tested to obtain Multiple information on wall defects of small diameter pipes.

Description

technical field [0001] The invention relates to an electromagnetic non-destructive testing probe, in particular to an inclined axial array circumferential eccentric eddy current probe and a method for detecting small-diameter tubes. Background technique [0002] Small-diameter pipes are widely used in various industrial fields such as energy and chemical industry. Due to the small diameter of the pipe, it is difficult to guarantee the manufacturing accuracy. After a period of service, its internal structure will inevitably suffer from damage such as macro and micro defects. Since the existence of damage will bring serious hidden dangers to the safe use of pipeline structures, it is particularly important to carry out regular inspection and evaluation. [0003] At this stage, for the detection of small-diameter tubes, the eddy current Bobbin probe detection method and the Pancake point probe scanning detection method are routinely used. These two methods are based on the ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/904G01N27/9093
CPCG01N27/9006G01N27/904
Inventor 解社娟杨庆宁李骥何琨王凯强陈洪恩陈振茂
Owner XI AN JIAOTONG UNIV
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