Through-type magnetic saturation eddy current detection device and detection method thereof
An eddy current detection and pass-through technology, which is applied in the direction of measuring devices, material analysis by electromagnetic means, and material magnetic variables, can solve problems such as inability to obtain and generate magnetic flux leakage signals, and achieve the goal of increasing detection functions and accuracy Effect
Pending Publication Date: 2022-02-08
EDDYSUN (XIAMEN) ELECTRONICS CO LTD
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This is because the magnetization direction of the steel pipe (or rod) between the two guide sleeves of the magnetic saturator is parallel to the longitudinal defect, and the magnetic flux leakage signal cannot be generated, so that the eddy current probe coil cannot obtain the defect information
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[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0040] like Figure 1 to Figure 13 As shown, a through-type magnetic saturation eddy current testing device is used for industrial non-destructive testing technology devices for through-type eddy current electromagnetic detection of metal steel pipes, rods, wires, etc. with an external magnetic saturator. The eddy current detection device of the metal pipe 1 includes an eddy current detection sensor 3 and a magnetic saturator 2 arranged along the axial direction of the detection object 1. The first magnet 21 and the second magnet 22 on the side, the first magnet 21 and the second magnet 22 have opposite polarities of N and S.
[0041]Wherein, the first magnet 21 and the second magnet 22 are arranged as a concave-convex structure in the shape of a square wave pulse on the side close to the detection sensor, and the N pole protruding part 211 of...
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The invention relates to a through-type magnetic saturation eddy current detection device and a detection method thereof, and relates to a nondestructive detection technical device for industrial through-type eddy current electromagnetic detection of metal steel pipes, rods, wires and the like with an external magnetic saturator. Generally, the through-type magnetic saturation eddy current detection device is an eddy current detection device externally penetrating through a metal pipe (1), comprises an eddy current detection sensor (3) and a magnetic saturator (2) arranged along the axial direction of a detection object (1), and is characterized in that the magnetic saturator (2) comprises a first magnet (21) and a second magnet (22) which are symmetrically fixed at two sides of the eddy current detection sensor (3) respectively along the axial direction of the detection object (1), and the N and S polarities of the first magnet (21) and the second magnet (22) are opposite; thus, magnetic field lines which are not parallel to the axial direction of the detected tube rod are generated on the surface of the metal tube rod, so that eddy current electromagnetic detection and magnetic flux leakage detection can be simultaneously carried out.
Description
technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to the eddy current testing technology with a magnetic saturator, in particular to a through-type magnetic saturation eddy current testing device and a testing method thereof. Background technique [0002] Through-type eddy current plus magnetic saturator eddy current testing of steel pipes, rods and wires is an efficient and fast non-destructive testing method widely used in industry. The inventor made related explanations in the national standard appendix of GB / T7735-2004 "Testing Method for Eddy Current Flaw Detection of Steel Tubes", pointing out that the detection principle has two effects of magnetic flux leakage and eddy current. However, due to the limitations of the method, for longitudinal defects, the contribution of magnetic flux leakage to the detection signal of effective eddy current is almost zero. This is because the magnetization direction of the s...
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IPC IPC(8): G01N27/83G01N27/90
CPCG01N27/83G01N27/9006
Inventor 林俊明曾志伟林泽森
Owner EDDYSUN (XIAMEN) ELECTRONICS CO LTD