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Nondestructive testing method and device for wire rope based on image fusion

A technology of non-destructive testing and image fusion, applied in measuring devices, optical testing flaws/defects, instruments, etc., can solve the problems of low recognition rate of steel wire ropes, achieve low cost, high precision, and solve the effect of low defect recognition rate

Active Publication Date: 2021-09-24
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem of low recognition rate of steel wire rope defects in the non-destructive testing of steel wire ropes in the prior art, the present invention provides a method and device for non-destructive testing of steel wire ropes based on image fusion

Method used

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  • Nondestructive testing method and device for wire rope based on image fusion
  • Nondestructive testing method and device for wire rope based on image fusion
  • Nondestructive testing method and device for wire rope based on image fusion

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specific Embodiment I

[0031] Specific embodiment 1: when adopting strong magnetic excitation mode, the structure of excitation assembly 201 is as follows image 3 As shown, the excitation assembly 201 includes a saddle-shaped permanent magnet 2011 . When testing the steel wire rope 3 to be tested, the excitation assembly 201 is arranged on one side of the steel wire rope 3 to be tested; the permanent magnet generates a magnetic field to excite the steel wire rope 3 to be tested. As another implementation manner, a saddle-shaped magnetic conductor and a coil can be used to replace the permanent magnet.

specific Embodiment II

[0032] Specific embodiment II: field weakening excitation is further divided into non-saturation excitation and residual field excitation.

[0033] When non-saturated excitation is used, the structure of the excitation component 201 is as follows Figure 4 As shown, it is formed by fixing n permanent magnets 2012 at equal intervals on the ring 2013, each permanent magnet 2012 is evenly distributed in the circumferential direction of the steel wire rope 3 under test, and the magnetic poles of each permanent magnet 2012 point to the same direction and are parallel to the steel wire rope 3 under test.

[0034] When residual field excitation is used, the structure of the excitation assembly 201 is as follows Figure 5 As shown, a first bar-shaped permanent magnet 2014 and a second bar-shaped permanent magnet 2015 are included. When excitation is required, the first bar-shaped permanent magnet 2014 and the second bar-shaped permanent magnet 2015 are respectively arranged at both e...

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Abstract

In order to solve the problem of low recognition rate of steel wire rope defects in the non-destructive testing of steel wire ropes in the prior art, the present invention provides a method and device for non-destructive testing of steel wire ropes based on image fusion. Visible light photography and magnetic flux leakage signal detection are collected at the same frequency, and the magnetic flux leakage signal is converted into a grayscale image of the magnetic field; the grayscale image of the magnetic flux leakage signal and the visible light image are respectively extracted from the average grayscale, average variance, smoothness, third-order moment, consistent property, entropy and seventh-order invariant moments, a total of thirteen image feature vectors, and then the above image feature vectors are fused to obtain the fusion feature vector, and then the fusion feature vector is input into the artificial neural network for classification and recognition, so as to realize the detection of steel wire rope defects Quantitative identification. The invention carries out the non-destructive detection on the steel wire rope through the image processing mode, and has the advantages of low cost and high precision.

Description

technical field [0001] The invention relates to a steel wire rope damage detection technology, in particular to a steel wire rope nondestructive detection method based on fusion of magnetic field grayscale images and visible light images. Background technique [0002] With the continuous advancement of science and technology, the application of steel wire ropes in mines, elevators, bridges and other fields has become more and more extensive, which has also led to the increasing dependence of the lifting industry on steel wire ropes. With the prolongation of the service time, the corrosion, wear and fatigue damage of the steel wire rope will evolve into broken wires, and a large number of broken wires will reduce the bearing strength of the steel wire rope. If the broken wires cannot be found in time and the steel wire rope is replaced The breakage of the rope will affect the safety of production, seriously endangering the safety of equipment and the safety of people and prod...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/88G01N27/82
CPCG01N21/8851G01N27/82G01N2021/8887
Inventor 张聚伟卢世梁王石磊李继刚李茜
Owner HENAN UNIV OF SCI & TECH