KR101686329B1 - Cable inspection apparatus and multi-channel cable inspection apparatus - Google Patents

Cable inspection apparatus and multi-channel cable inspection apparatus Download PDF

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Publication number
KR101686329B1
KR101686329B1 KR1020150074884A KR20150074884A KR101686329B1 KR 101686329 B1 KR101686329 B1 KR 101686329B1 KR 1020150074884 A KR1020150074884 A KR 1020150074884A KR 20150074884 A KR20150074884 A KR 20150074884A KR 101686329 B1 KR101686329 B1 KR 101686329B1
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KR
South Korea
Prior art keywords
cable
sensor
frame
inspection apparatus
sensor member
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Application number
KR1020150074884A
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Korean (ko)
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KR20160141130A (en
Inventor
박승희
김주원
Original Assignee
성균관대학교산학협력단
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Priority to KR1020150074884A priority Critical patent/KR101686329B1/en
Priority to PCT/KR2016/005331 priority patent/WO2016190611A1/en
Publication of KR20160141130A publication Critical patent/KR20160141130A/en
Application granted granted Critical
Publication of KR101686329B1 publication Critical patent/KR101686329B1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/0005—Geometrical arrangement of magnetic sensor elements; Apparatus combining different magnetic sensor types
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
    • G01R33/07—Hall effect devices

Abstract

The present invention relates to a cable inspecting apparatus and a multi-channel cable inspecting apparatus. The cable inspecting apparatus includes a plate-shaped frame fixed to maintain a certain distance from a center of a cable, a sensor A magnetic member which is coupled to the sensor member and forms a magnetic field with the frame therebetween, and an elastic member which provides an elastic force between the frame and the sensor member so that the sensor member remains in contact with the cable .
Accordingly, the sensor member and the magnetic member can be moved by using the elastic force to the fixed frame, and the lift-off, which has the greatest influence on the detection performance of the leakage magnetic flux technique, can be kept constant, It is possible to provide a cable inspection apparatus capable of more sensitively detecting the leakage magnetic flux signal generated in the cable inspection apparatus.

Description

[0001] Cable inspection apparatus and multi-channel cable inspection apparatus [

The present invention relates to a cable inspection apparatus and a multi-channel cable inspection apparatus, and more particularly, to a cable inspection apparatus and a multi-channel cable inspection apparatus that judge whether a cable is damaged by using a leakage magnetic flux of a magnetic body.

In recent years, the construction of social infrastructures using cables such as cable-stayed bridges and suspension bridges has been actively carried out. In such structures, cable members play a key role in supporting most of the loads of the structure.

The cables used in the above bridges are generally manufactured for use for decades but are corroded or defective due to polluted atmosphere, moisture, and the like. If a cable is defective, it is very important to find out where the cable is damaged because it can lead to a major accident if left untreated, and it can lead to damage to the infrastructure and social infrastructure that cost a lot of money and time.

As a method of examining the damage of the cable, a method using an induction magnetic field and a method using a leakage magnetic flux of a magnetic body are used. The use of a dual induction magnetic field is effective as a method of inspecting damage to difficult-to-access locations, but there are limitations in locating specific damage locations of cables made of stranded wires.

The method of checking the damage of the cable using the leakage magnetic flux is the most commonly used method at present, and the damage position is inspected using the characteristic of the cable as a magnetic body. This method allows the device 10 as shown in Fig. 1 to sufficiently magnetize the measured cable 90 while moving in the longitudinal direction of the cable 90 to be measured and to measure each of the cables 90 arranged in the circumferential direction of the cable 90 The sensor 11 senses the leakage magnetic flux signal and analyzes it in the signal processing device 20 to inspect the cable 90 for damage.

In the cable diagnosis of leakage magnetic flux technique, the lift-off, the distance between the sensor and the cable under test, is known to be the most important factor in the accuracy of the test. As the diameter of the cable changes, if the lift-off value is changed, the leakage magnetic flux signal data acquired by the sensor will be erroneous and the detection capability will be significantly deteriorated.

Since the conventional cable inspection apparatus has the sensor 11 and the magnetizing unit 13 fixed to the single frame 12, the cable 90 and the sensor 11 can be prevented from being deformed as the diameter of the cable 90 to be measured is changed. And the distance between the magnetizing portion 13 and the cable 90 is also changed. Therefore, there is a problem that the accuracy of the inspection is significantly reduced.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a method of driving a fixed frame by using an elastic force to move a sensor and a magnetized part, So as to improve the detection performance of the leakage magnetic flux signal data.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.

A cable inspection apparatus according to an embodiment of the present invention includes a plate-shaped frame fixed to maintain a certain distance from a center of a cable; A sensor member having a sensor for sensing a magnetic field formed on a surface thereof contacting the cable; A magnetic member coupled with the sensor member through the frame and forming the magnetic field; And an elastic member for providing an elastic force between the frame and the sensor member so that the sensor member remains in contact with the cable.

Here, it is preferable that the sensor member has a connecting portion passing through the frame, and the magnetic member is coupled to an end of the connecting portion.

Here, the sensor is preferably a hall sensor.

Preferably, the elastic member is a spring inserted between the frame and the sensor member at a connection portion of the sensor member.

Here, the sensor is preferably inserted into a pig-shaped sensor from the opposite side of the surface of the sensor unit and fixed.

Here, it is preferable that a hole is formed in the frame and the magnetic member so that the pig-shaped sensor passes through the hole.

A multi-channel cable inspection apparatus according to an embodiment of the present invention includes: a frame having a plurality of plate-shaped surfaces formed at a predetermined distance from a center of a cable; And the above-described cable inspection apparatus formed on each side of the frame.

Here, it is preferable that the plurality of surfaces form a regular polygon centering on the cable.

Here, the regular polyhedron is preferably a square.

Here, it is preferable that a plurality of the multi-channel cable inspection apparatuses are formed at different angles in the longitudinal direction of the cable.

According to the present invention, it is possible to move the sensor and the magnetizing part by using an elastic force in a fixed frame, thereby maintaining a lift-off which has the greatest influence on the detection performance of the leakage magnetic flux technique, It is possible to more sensitively detect the leakage magnetic flux signal generated by the magnetic sensor.

In addition, a multi-channel inspection can be performed by installing a cable inspection device in a multi-facet frame, and if a multi-channel cable inspection device is formed at different angles in the longitudinal direction of the cable, There is an advantage that the cable inspection apparatus can be flexibly deformed.

FIG. 1 is a perspective view showing a cable inspection apparatus of a conventional leaky magnetic flux technique.
2 is a cross-sectional view of a cable inspection apparatus according to an embodiment of the present invention.
3 is a cross-sectional view illustrating an operation of a cable inspection apparatus according to an embodiment of the present invention.
4 is a perspective view illustrating a multi-channel cable inspection apparatus according to an embodiment of the present invention.
5 is a front view of Fig.
6 is a perspective view of a multi-channel cable inspection apparatus according to another embodiment of the present invention.
7 is a front view of Fig. 6. Fig.

Hereinafter, a cable inspection apparatus and a multi-channel cable inspection apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. This is for the purpose of illustrating the present invention and is not intended to limit the scope of protection defined by the appended claims.

2 is a cross-sectional view of a cable inspection apparatus according to an embodiment of the present invention.

A cable inspection apparatus 100 according to an embodiment of the present invention includes a frame 110, a sensor member 120, a magnetic member 130, and an elastic member 140.

The frame 110 is fixed to the cable 190 to maintain a certain distance from the center of the cable 190 to be measured and may be a long plate-like shape in the longitudinal direction of the cable 190. The magnetic member 130 is located at one side of the frame 110 and at the other side of the sensor member 120. A hole 112 may be formed in the frame 110 to allow the sensor member 120 and the magnetic member 130 to be connected. In addition, a hole 111 may be formed so that the body of the pig-type sensor 125, which will be described later, can pass therethrough.

The sensor member 120 is in contact with the cable 190 on one side as shown in the figure, and the connecting part 121 is formed on the opposite side in a cylindrical shape. In the figure, two connecting portions 121 are formed in the sensor member 120, but the number of the connecting portions 121 is not limited to this and can be modified. The connection part 121 may be fixedly coupled with the magnetic member 130, which will be described later, through the frame 110.

A sensor 125 that detects a leakage magnetic signal may be formed on one side of the cable 190 that is in contact with the cable 190. For example, a hall sensor may be used. The Hall sensor is a sensor that detects the direction and size of a magnetic field by using a Hall effect that generates a voltage in a direction perpendicular to a current and a magnetic field when a magnetic field is applied to a conductor through which the current flows. The sensor 125 may be a pig-type sensor 125 having a sensor for detecting a magnetic leakage signal at the end of a long body. In this case, the sensor 125 may contact the cable 190 at a side opposite to the side where the connection 121 is formed Type sensor 125 can be fixed to the sensor member 120 by inserting the sensor in the direction of one side. When the pig-type sensor 125 is used, holes 111 and 131 are formed in the frame 110 and the magnetic member 130, respectively, so that the body of the sensor 125 does not disturb the movement of the sensor member 120 So that the body of the sensor 125 can freely move.

The magnetic member 130 forms a magnetic field for the inspection of the cable 190 and can be made of a permanent magnet. The magnetic member 130 can be coupled with the sensor member 120 with the frame 110 interposed therebetween and the connection portion 121 of the sensor member 120 is inserted into the hole 112 formed in the frame 110, And the magnetic member 130 may be fixed to the end of the connection part 121. [ If the magnetic member 130 and the sensor member 120 are coupled with each other and the movable member 130 can freely move up and down with the frame 110 interposed therebetween, Can be combined. Also, as described above, the magnetic member 130 may be provided with a hole 131 through which the body of the pig-shaped sensor 125 can pass.

The elastic member 140 provides an elastic force between the frame 110 and the sensor member 120 to move the sensor member 120 about the frame 110. Since the sensor member 120 and the magnetic member 130 are coupled to each other, the magnetic member 130 can be moved together when the sensor member 120 is moved. 2, the elastic member 140 may be a spring. The elastic member 140 may be inserted into the connection portion 121 and inserted into the connection portion 121 between the sensor member 120 and the frame 110 , It is possible to provide an elastic force to the sensor member 120. One side of the sensor member 120 is in contact with the cable 190 and the sensor member 120 is coupled with the magnetic member 130 to center the frame 110 fixed in position from the center of the cable 190 The one side of the sensor member 120 can always contact the cable 190 due to the elastic force of the elastic member 140. [

Hereinafter, the operation of the cable inspection apparatus according to one embodiment of the present invention described above with reference to FIG. 3 will be described.

3 is a cross-sectional view illustrating an operation of a cable inspection apparatus according to an embodiment of the present invention.

The cable test apparatus 100 according to an embodiment of the present invention may be configured such that when the diameter of the cable 190 to be measured is small on the left side and the diameter of the cable 190 to be measured is large on the left side, Fig. The position of the frame 110 from the center of the cable 190 is fixed and the sensor member 120 coupled together by the elastic force of the elastic member 140 while the position of the frame 110 is fixed, And the magnetic member 130 can move up and down. One side of the sensor member 120 always comes into contact with the outer circumferential surface of the cable 190 by the elastic force of the elastic member 140. [ Therefore, in the present invention, even if the diameter of the cable 190 to be measured is changed, the sensor member 120 can always contact the outer circumferential surface of the cable 190, so that the lift-off can be always kept constant. Since the magnetic member 130 also moves up and down when the sensor member 120 moves up and down, the magnetic member 130 maintains the same distance as the outer circumferential surface of the cable 190 even if the diameter of the cable 190 is changed A magnetic field can be formed. In addition, the sensor member 120 can always sense a leakage magnetic signal in a state of being in contact with the outer circumferential surface of the cable, that is, at the same position. Therefore, even when the diameter of the cable 190 changes during the inspection, the lift-off can be always maintained constant, so that the leakage magnetic flux signal generated at the damaged portion of the cable 190 can be more accurately detected.

Next, a multi-channel cable testing apparatus 200 according to an embodiment of the present invention will be described.

FIG. 4 is a perspective view illustrating a multi-channel cable inspection apparatus according to an embodiment of the present invention, and FIG. 5 is a front view of FIG.

Hereinafter, the duplicated contents of the cable inspection apparatus 100 according to the embodiment of the present invention will be described with reference to the differences and the added contents. In the present invention, the frame 210 is formed with a plurality of plate-like surfaces that maintain a certain distance from the center of the cable 290, as shown. In the figure, four surfaces are formed vertically, horizontally and vertically with a square shape around a cable 290. Of course, when considering the joint surfaces connecting the upper, lower, left and right sides, it is a square shape considering the shape of the octagon or the surface on which the cable inspection apparatus is formed. Further, the shape of the frame 210 is not limited to a square shape as shown, but can be deformed into another regular polygonal shape if each surface can maintain the same distance as the center of the cable 290.

As shown in the drawing, the cable inspection apparatus 100 described above with reference to FIG. 2 can be formed on each side of the frame 210. Therefore, in the present invention, it is possible to check the damage of the cable 290 in four channels on the upper, lower, left, and right sides. As described above, when the number of sides of the frame is differently formed and the cable inspection device is formed on each surface, cable inspection devices of various channels can be formed.

Hereinafter, a multi-channel cable testing apparatus according to another embodiment of the present invention will be described.

FIG. 6 is a perspective view of a multi-channel cable inspection apparatus according to another embodiment of the present invention, and FIG. 7 is a front view of FIG.

As shown in FIG. 4, two multi-channel cable inspection devices 200a and 200b are formed in the longitudinal direction of the cable 290 with reference to FIGS. At this time, it is preferable to form the cable 290 at different angles with respect to the center of the cable 290. As shown in FIG. 7, the front multi-channel cable testing device 290a can examine the cable 290 in four directions, and the multi-channel cable testing device 200b located behind the cable testing device 200b can detect the cable (290) can be inspected. Therefore, it is possible to inspect the damaged portion of the cable 290 more accurately on a narrower method. The greater the number of cables 290 formed in the longitudinal direction, the more precisely the narrower range can be inspected. That is, the inspection resolution can be increased. Therefore, in the present invention, the number of sensing channels can be flexibly modified depending on the object to be inspected.

The scope of the present invention is not limited to the above-described embodiments, but may be embodied in various forms of embodiments within the scope of the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

110, 210: frame 111, 112: hole
120, 220: sensor member 125, 225: sensor
121, 221: connection part 130, 230: magnetic member
131: holes 140, 240: elastic member

Claims (10)

A plate-shaped frame fixed to maintain a certain distance from the center of the cable;
A sensor member having a sensor for sensing a magnetic field formed on a surface thereof contacting the cable;
A magnetic member coupled with the sensor member through the frame and forming the magnetic field; And
And an elastic member for providing an elastic force between the frame and the sensor member so that the sensor member maintains contact with the cable,
Wherein the sensor is inserted and fixed on the opposite surface of the sensor member with a pig-shaped sensor, and the frame and the magnetic member are provided with holes through which the pig-shaped sensor passes. The method according to claim 1,
Wherein the sensor member is formed with a connecting portion passing through the frame, and the magnetic member is coupled to an end of the connecting portion. The method according to claim 1,
Wherein the sensor is a hall sensor. 3. The method of claim 2,
Wherein the elastic member is a spring inserted into a connection portion of the sensor member between the frame and the sensor member. delete delete A frame having a plurality of plate-shaped surfaces for keeping a certain distance from the center of the cable; And
And a cable inspection apparatus formed on each side of the frame and according to any one of claims 1 to 4. 8. The method of claim 7,
Wherein the plurality of surfaces form a regular polygon about the cable. 9. The method of claim 8,
Wherein the regular polygon is a square. 8. The method of claim 7,
Wherein the multi-channel cable inspection apparatus comprises a plurality of cables having different angles in the longitudinal direction of the cable.
KR1020150074884A 2015-05-28 2015-05-28 Cable inspection apparatus and multi-channel cable inspection apparatus KR101686329B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020150074884A KR101686329B1 (en) 2015-05-28 2015-05-28 Cable inspection apparatus and multi-channel cable inspection apparatus
PCT/KR2016/005331 WO2016190611A1 (en) 2015-05-28 2016-05-19 Cable inspection apparatus and multi-channel cable inspection apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150074884A KR101686329B1 (en) 2015-05-28 2015-05-28 Cable inspection apparatus and multi-channel cable inspection apparatus

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KR20160141130A KR20160141130A (en) 2016-12-08
KR101686329B1 true KR101686329B1 (en) 2016-12-14

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CN107703207A (en) * 2017-09-27 2018-02-16 武汉理工大学 A kind of suspension cable the cannot-harm-detection device
KR102515575B1 (en) * 2017-11-08 2023-03-30 한국전력공사 Magnetic measuring device and the method thereof
KR102535133B1 (en) * 2021-08-20 2023-05-26 한국로봇융합연구원 Analysis system for defect of pipe

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KR100827790B1 (en) * 2006-06-29 2008-05-07 주식회사엑소 Wire Rope Defect Detection System and Method Thereof
US8368395B2 (en) * 2008-12-17 2013-02-05 Ndt Technologies, Inc. Magnetic inspection device and method for detecting loss in metallic cross section
WO2011148456A1 (en) * 2010-05-25 2011-12-01 三菱電機株式会社 Wire rope flaw detection device
KR101192286B1 (en) * 2011-02-09 2012-10-17 한국표준과학연구원 Device for detecting LF and LMA of wire rope
JP6193077B2 (en) * 2012-10-30 2017-09-06 東京製綱株式会社 Wire rope inspection equipment

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