WO2019132219A1

WO2019132219A1 - Magnetic flux leakage pig

Info

Publication number: WO2019132219A1
Application number: PCT/KR2018/013161
Authority: WO
Inventors: 유휘용; 조성호; 김동규; 김상혁; 김대광; 김재준; 양승웅
Original assignee: 한국가스공사
Priority date: 2017-12-29
Filing date: 2018-11-01
Publication date: 2019-07-04
Also published as: KR102000847B1; KR20190081093A; CN111902669A; CN111902669B

Abstract

A magnetic flux leakage PIG according to one embodiment of the present invention comprises: a body formed to move in the gas flow direction inside a pipe; and multiple magnetizing modules coupled to the outer peripheral surface of the body along the circumferential direction thereof. Each of the magnetizing modules comprises: a support coupled to the body; a module body configured to come in contact with the inner peripheral surface of the pipe; a pair of levers which are axially coupled to the module body at one end of each thereof and to opposite ends of the support at the other end of each thereof such that the magnetizing module contracts or expands depending on a change in the diameter of the pipe, and which can be rotated by the bidirectional rotation of each axis-coupling portion; and a suspension portion comprising: an elastic support body having one surface fixed on the support and elastically supporting the levers; and a pair of first rollers coupled to opposite ends of the elastic body and in contact with the levers, respectively.

Description

Magnetic leaking pig

The present invention relates to a self-leaking pig, and more particularly, to a self-leaking pig that reduces frictional force between a pipe and a pig to enable operation in a pipe having a low operating pressure.

Plumbing facilities are one of the infrastructure of various infrastructures. As the industry has developed, large structures have increased and the piping lines used for the structures have become complicated. For example, complex piping systems were required to transport natural gas from an LNG terminal to a home or an industrial site, and it was extremely difficult to maintain the integrity and safety of the piping by burying the piping system underground in accordance with urban and land utilization plans . Therefore, it has become very important to find defects in the pipe due to aging or corrosion of the pipe.

One way to inspect these embedded gas pipelines is to use an Intelligent PIG (Pipeline Inspection Gauge) system, which is a non-destructive inspection system that measures pipe thickness (eg, magnetic leakage (Magnetic Flux Leakage (MFL), Ultrasonic Testing (UT), Electro-Magnetic Acoustic Transducer (EMAT)) and inspecting while inspecting the inside of pipes. The present invention aims to improve the performance and utility of magnetic leaky tissue systems in intelligent pigs.

There is a large friction between the self-leakage pigtail and the inner wall of the pipe that magnetizes the magnetizer. Since the magnetic leakage piping can be driven forward by the gas pressure difference (gas pressure difference) before and after the piping, there must be a certain level of pressure difference in order to overcome the large friction between the magnetizing unit and the piping.

[Prior art document]

[Patent Literature]

(Patent Document 1) KR10-0947700 B1

SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic leakage piping having a structure for reducing friction between a magnetizing unit and a piping so that the piping can be driven even in a pipe having a low operating pressure.

A magnetic leakage piping according to an embodiment of the present invention includes a main body formed to move in a gas flow direction inside a pipe and a plurality of magnetization modules coupled along a circumferential direction at an outer circumferential surface of the main body, A module body which is formed to magnetize the pipe and extend to a predetermined length in the gas flow direction and is in contact with the inner circumferential surface of the pipe, The module main body and the module main body are axially coupled to each other so that the magnetization module shrinks or relaxes in accordance with the diameter change of the pipe, and both ends of the support rod are axially coupled to each other, A pair of levers and a long side in the form of a curved surface in the longitudinal direction of the support, And a pair of first rollers coupled to both ends of the elastic support, the pair of first rollers contacting both ends of the elastic support, wherein when the magnetization module is retracted, And the first roller is moved from one end to the other end of the lever by retracting the support toward the support.

The magnetic leakage piping according to an embodiment of the present invention includes a first cup formed in a front portion of the main body and in contact with an inner surface of the pipe, and a second cup formed in a rear portion of the main body and contacting the inner surface of the pipe, And the plurality of magnetization modules are disposed between the first cup and the second cup.

The self-leaking pig according to an embodiment of the present invention is characterized in that when the module main body is at the maximum distance from the main body, the pair of first rollers come into contact with one end of the lever, The pair of first rollers is brought into contact between one end of the lever and the other end.

In the magnetic leaky cap according to an embodiment of the present invention, the module main body includes a pair of engagement holes formed in the module body so that an axis of the one end of the lever is engaged, and at least one of the pair of engagement holes One of which is formed as a movable joint hole formed so as to extend in the longitudinal direction of the module main body so that an axis of the one end of the lever is engaged with the movable joint hole so as to be movable in the longitudinal direction of the movable joint hole corresponding to the rotation of the lever.

In the self-leaking pig according to an embodiment of the present invention, the support base includes a first protrusion protruding from the opposite side surfaces of the support to fix both side surfaces of the elastic support.

In the magnetic leakage peg according to an embodiment of the present invention, the lever is formed to extend in the width direction of the lever at one end of the lever, so that when the module main body is at the maximum distance from the main body, And a second restricting surface which comes into contact with the second protrusion.

The self-leaking piggyback according to an embodiment of the present invention can change the position of the sensor module even with a small force, thereby minimizing the friction between the piping and the piggyback so that the self-leaking piggy can be driven within the piping with low operating pressure. In addition, the elastic support and other structures of the self-leakage pig according to an embodiment of the present invention allow the self-leakage pig to be driven while adapting to the diameter change of the pipe.

1 is a perspective view of a self-sealing pig according to an embodiment of the present invention;

2 is a cross-sectional view of a self-sealing pig according to an embodiment of the present invention;

FIG. 3 is a perspective view of a magnetization module of a magnetic leakage pig according to an embodiment of the present invention; FIG.

FIG. 4 is a top view of a magnetization module of a magnetic leakage pig according to an embodiment of the present invention; FIG.

5A is a front view of a magnetization module of a magnetic leakage pig according to an embodiment of the present invention;

FIG. 5B is a side view of a magnetization module of a magnetic leakage pig according to an embodiment of the present invention; FIG.

FIG. 6A is a front view of a retracted magnetization module of a magnetic leakage pig according to an embodiment of the present invention; FIG.

FIG. 6B is a side view of a retracted magnetization module of a magnetic leaky paper according to an embodiment of the present invention; FIG. And

7 is an enlarged view of a magnetization module of a magnetic leakage pig according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objects, particular advantages and novel features of one embodiment of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings and the preferred embodiments thereof. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. It is also to be understood that terms such as "top," " under, "" first," "second, " and the like are used to distinguish one element from another, no. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, a detailed description of known arts which may unnecessarily obscure the gist of an embodiment of the present invention will be omitted.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings, in which like reference numerals refer to like elements.

FIG. 1 is a perspective view of a magnetic leaky paper 1 according to an embodiment of the present invention, FIG. 2 is a sectional view of a magnetic leaky paper 1 according to an embodiment of the present invention, and FIG. 1 is a perspective view of the magnetization module 20 of the magnetic leakage pig 1 according to the example.

The magnetic leakage peg 1 according to an embodiment of the present invention includes a main body 10 configured to move in a gas flow direction inside a pipe and a plurality of magnetization modules 20 The magnetization module 20 includes a support 300 coupled to the main body 10 so as to extend a predetermined length in the flow direction of the gas and a built-in permanent magnet 110 magnetize the pipe , A module body (100) formed to extend by a predetermined length in the gas flow direction and in contact with an inner circumferential surface of the pipe, and a module body (100) extending in the gas flow direction to shrink or relax the magnetization module A pair of levers 200 rotatable by biasing the axes of the axes of the pair of levers 200 and the axes of the axes of the supports 300, In a direction The elastic supporting body 410 is formed in a long curved shape and has one side fixed on the supporting base 300 to elastically support the lever 200. The elastic supporting body 410 is coupled to both ends of the elastic supporting body 410, And a suspension unit 400 including a pair of first rollers 420 to be contacted with the elastic support 410. When the magnetization module 20 is contracted, the elastic support 410 is contracted toward the support 300, The first roller 420 moves from one end of the lever 200 toward the other end.

The magnetic leakage pig (1) of the present invention is moved in the flow direction of the gas by the differential pressure of the gas formed in the forward and backward directions of the pig (1). Therefore, the force applied to the pig 1 by the differential pressure of gas is greater than the friction between the pig 1 and the pipe, so that the self-leakage pig 1 can advance. The magnetic leakage pig (1) of the present invention can be inspected while moving the piping even if the operating pressure (differential pressure of gas) of the piping is lower than 3 MPa by drastically reducing the frictional force between the pig (1) and the piping.

1 and 2, the magnetic leakage pig 1 includes a body 10 disposed at the center and a plurality of magnetization modules 20 coupled along the circumferential direction at the outer circumferential surface of the body 10 . 1, the magnetization module 20 is arranged continuously with respect to each other so as to inspect all inner circumferential surfaces of the pipe. 2, the main body 10 is disposed at the center of the pig 1, and the magnetization module 20 and the pig 10 are combined.

3, the magnetization module 20 includes a module body 100, a lever 200, a support 300, and a suspension unit 400. The support base 300 is formed by extending a predetermined length in the flow direction of the gas. The support base 300 is coupled to the main body 10 and a plurality of magnetization modules 20 are coupled along the circumferential direction of the main body 10 so that the support base 300 is also coupled along the circumferential direction of the main body 10 . The support base 300 indirectly supports the module main body 100 by supporting the lever 200. When the magnetization module 20 is maximally contracted and the module main body 100 is nearest to the support base 300, The module body 100 can be directly supported by a shape protruding upward from one end of the module body 300.

The module body 100 may include a permanent magnet 110, a second roller 120, and a sensor 130. The module main body 100 is formed by extending by a predetermined length in the gas flow direction. 3 and 4, the sensor 130 is formed on the upper surface of the module main body 100, and the upper surface of the module main body 100 is connected to the upper surface of the module main body 100 The sensor 130 can check the defects of the pipe by contacting the inner circumferential surface of the pipe. The module main body 100 includes a built-in permanent magnet 110. The sensor 130 is constituted by a hall sensor and the sensor 130 can measure the magnetic flux generated by the permanent magnet 110. The magnetic flux at the defective point of the pipe is measured to detect the presence of defects in the pipe . The permanent magnet 110 may also cause a magnetic force to act between the piping and the module body 100 to assist in the contact between the sensor 130 and the piping. The second roller 120 may be coupled to the upper surface of the module body 100. The second roller 120 can minimize the friction by making contact with and rotating the pipe, thereby allowing the self-leakage pig 1 to adapt to the diameter change when the diameter of the pipe changes.

5B and 6B, the widths of the module main body 100 and the support base 300 are formed to be wider as they are farther from the center of the main body 10. This structure is based on the fact that the magnetization module 20 is disposed along the outer circumferential surface of the pipe. When the length of the circumference increases as the distance from the center of the main body 10 increases, the interval between the magnetization modules 20 Do not open it.

The pair of levers 200 are coupled so as to connect axially between the module body 100 and the support base 300. The gap between the module main body 100 and the support base 300 may become narrower and narrower through the configuration of the pair of levers 200 so that the magnetization module 20 may be contracted or relaxed So that the size of the magnetic leakage peg 1 can be adjusted. The pair of levers 200 are formed to have a predetermined length and one end in the longitudinal direction of the pair of levers 200 and the module main body 100 are axially coupled to each other and the other end in the longitudinal direction of the lever 200, Both ends of which are axially coupled to each other. Therefore, the pair of levers 200 can be pivoted by rotating the shaft coupling portion in both directions. At this time, as shown in FIG. 5A, the pair of levers 200 are formed to move away from one end of the lever 200 toward the other end.

The suspension unit 400 includes an elastic support 410 and a first roller 420. The suspension unit 400 is disposed between the support base 300 and the lever 200 so that the suspension 200 directly supports the lever 200 to elastically support the body module 100 indirectly. Referring to FIG. 3, the elastic support 410 is formed to have a curved shape in the longitudinal direction of the support base 300, and elastically supports the lever 200. The curvature of the curved surface of the elastic supporter 410 can be changed according to the surrounding conditions. In the high pressure piping, the curvature of the curved surface of the elastic supporter 410 can be increased to enhance the contact between the pipette and the pig 10, The curvature of the curved surface of the elastic supporter 410 may be reduced to reduce the repulsive force of the elastic supporter 410 to minimize the frictional force between the pipe and the pig 10. A pair of first rollers 420 are coupled to both ends of the elastic supporter 410 so that the first roller 420 rolls on the lever 100 while contacting the lever 100. 5A and 6A, the first roller 420 can be moved in contact with the lever 100 along the length thereof, so that the magnetization module 20 is contracted and the elastic support 410 is moved toward the support 300 And moves from one end of the lever 200 toward the other end when it is contracted. At this time, the point of action of the force acting to contract the elastic supporter 410 becomes the contact point between the first roller 420 and the lever 200. The point of action moves from one end of the lever 200 toward the other end, The material of the elastic supporter 410 is expanded to both ends to minimize condensation of the material, thereby minimizing the repulsive force of the elastic supporter 410. Accordingly, as the repulsive force of the elastic supporter 410 is reduced, the magnetizing module 20 weakens the force of pushing the pipe, and the frictional force between the pipe and the magnetization module 20 becomes small. With this structure, it is possible to operate the magnetic leakage pig 1 of the present invention even when the gas pressure difference in the pipe is small.

The magnetic leakage peg 1 according to an embodiment of the present invention includes a first cup 30 formed on a front surface portion of the main body 10 and contacting the inner surface of the main pipe 10 and a second cup 30 formed on a rear surface portion of the main body 10 And a plurality of magnetization modules (20) are disposed between the first cup (30) and the second cup (40).

1, a plurality of magnetization modules 20 surround a main body 10 in a circumferential direction, a first cup 30 is disposed on a front portion of the main body 10 with a magnetization module 20 interposed therebetween, A second cup (40) is disposed on the rear side of the main body. The first cup 30 and the second cup 40 come into contact with the inner surface of the pipe.

The first cup 30 and the second cup 40 may be formed using materials such as urethane, rubber, silicone, etc., which are excellent in buffering and elasticity. The pipe is shielded through the first cup 30 and the second cup 40 so that the gas flow is interrupted to generate a gas pressure difference in the forward and backward directions of the pig 1 and the magnetic leaky pig 1 is driven by the gas differential pressure .

A coupling means 50 may be formed in the front portion of the magnetic leakage piping 1, and an additional device may be incorporated in the coupling means to form a gas pressure differential in the piping in front of the magnetic leakage pig 1. In this way, when the separate structure is coupled to the magnetic leakage pig 1, the engagement of the coupling port 50 with the first cup 30 and the second cup 40 can be released.

The magnetic leakage pig 1 according to an embodiment of the present invention is characterized in that when the module main body 100 is at a maximum distance from the main body 10, And the pair of first rollers 420 is moved between one end of the lever 200 and the other end of the lever 200 when the module body 100 is nearest to the main body 10, .

5A, the first roller 420 may be disposed at one end of the lever 200 when the module main body 100 is spaced from the main body 10 at the maximum. 6A, even when the distance between the module body 100 and the main body 10 is minimized by the maximum retraction of the elastic supporter 410 toward the support base 300, the first roller 420 So as not to reach the other end of the lever 200. Even when only one end of the module main body 100 is close to or spaced apart from the main body 10 in order to cope with the change in the diameter of the piping, the first roller 420 is designed so as not to approach the other end of the lever 220 do. Therefore, when the magnetization module 20 is contracted, the first roller 420 continuously moves from one end of the lever 200 toward the other end, so that the point of action of the force is away from the center of the elastic support 410, The condensation of the material is minimized, and the repulsive force of the suspension unit 400 becomes small.

The module body 100 includes a pair of coupling holes (not shown) formed in the module body 100 so that an axis of one end of the lever 200 is coupled to the module body 100. In the magnetic leakage pig 1 according to the embodiment of the present invention, And at least one of the pair of coupling holes 140 is formed as a movable coupling hole 141 formed to extend in the longitudinal direction of the module main body 100, Is coupled to the movable coupling hole (141) so as to be movable in the longitudinal direction of the movable coupling hole (141) corresponding to the rotation of the lever (200).

The module body 100 includes a pair of engagement holes 140. The shaft of one end of the lever 200 is coupled to the coupling hole 140. Referring to FIG. 7, at least one of the pair of coupling holes 140 is formed as a movable coupling hole 141 formed in the longitudinal direction of the module body 100. The movable coupling hole 141 is movable in the longitudinal direction of the movable coupling hole 141 at one end of the lever 200 corresponding to the rotation of the lever 200. The length of the movable coupling hole 141 depends on the stroke conditions of the lever 200 and the module main body 100. Only one of the coupling holes 140 is formed as the movable coupling hole 141 or the coupling hole 140 Are all formed by the movable engaging holes 141. As shown in Fig.

In the magnetic leakage pig 1 according to the embodiment of the present invention, the supporter 300 is formed on both sides of the supporter 300 so as to protrude above the supporter 300 and fix both side surfaces of the supporter 300 As shown in FIG.

Referring to FIG. 3, the support 300 includes a first protrusion 310. The first restricting tab 310 is configured to fix the elastic supporter 410. The lower surface of the elastic supporter 410 is engaged with and fixed to the supporter 300. At this time, the supporter 300 and the elastic supporter 410 can be coupled through a screw-like configuration. In order to prevent the first roller 420 from being detached from the lever 200 in the circumferential direction of the main body 10 due to the rotation of the elastic supporting body 410, On both sides of the support 300. The first support tabs 310 formed on both sides of the support base 300 are spaced apart from each other by an interval equal to the width of the elastic support base 410.

The lever 200 is extended from the one end of the lever 200 in the width direction of the lever 200 so that the module body 100 can be easily inserted into the lever 200. [ (210) contacting the first roller (420) when the first roller (420) is maximally spaced from the main body (20).

The lever 200 may include a configuration that prevents the first roller 420 from being separated from the first roller 420. [ The lever 200 is configured to solve the problem that the first roller 420 is caught between the module body 100 and the lever 200 beyond the jaws at one end of the lever 200 when the magnetization module 20 is contracted As shown in FIG. The second restricting tails 210 extend from one end of the lever 200 in the width direction of the lever 200. The first roller 420 comes into contact with the second bushing 210 when the module body 100 is at the maximum distance from the main body 20. [ Accordingly, the first roller 420 is not caught between the module body 100 and the lever 200.

A rail may be further formed on the contact surface of the lever 200 which contacts the first roller 420. The first roller 420 can be coupled to the rail so that the rail can prevent the first roller 420 and the first roller 310 from falling in the circumferential direction of the main body 10.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification and the modification are possible.

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 invention as defined by the appended claims.

[Description of Symbols]

1: magnetic leakage paper 10: body

20: magnetization module 30: first cup

40: second cup 50:

100: Module body 110: Permanent magnet

120: second roller 130: sensor

140: engaging groove 141: movable engaging groove

200: lever 210:

300: support base 310: first bust

400: Suspension part 410: Elastic support

Claims

And a plurality of magnetization modules coupled along the circumferential direction at the outer circumferential surface of the main body,

The magnetization module includes:

A support coupled to the body to extend a predetermined length in a flow direction of the gas;

A built-in permanent magnet magnetizes the pipe, extends to a predetermined length in the gas flow direction, and contacts the inner circumferential surface of the pipe;

The module main body and the module main body are axially coupled to each other so that the magnetization module shrinks or relaxes in accordance with the diameter change of the pipe, and both ends of the support rod are axially coupled to each other, A pair of levers; And

A pair of first rollers coupled to both ends of the elastic supporter and contacting the lever, the elastic supporter being elongated in the form of a curved surface in the longitudinal direction of the supporter and having one surface fixed on the supporter to elastically support the lever, And a suspension unit including the suspension unit,

Wherein when the magnetization module is retracted, the elastic roller is retracted toward the support so that the first roller moves from one end to the other end of the lever.
The method according to claim 1,

A first cup formed on a front portion of the main body and contacting the inner surface of the pipe, and a second cup formed on a rear portion of the main body and contacting the inner surface of the pipe,

Wherein the plurality of magnetization modules are disposed between the first cup and the second cup.
The method of claim 2,

Wherein the pair of first rollers contact one end of the lever when the module main body is at the maximum distance from the main body,

Wherein the pair of first rollers are in contact between one end and the other end of the lever when the module body is maximally close to the main body.
The method of claim 3,

The module body includes:

And a pair of coupling holes formed in the module main body such that an axis of the one end of the lever is engaged,

At least one of the pair of coupling holes is formed as a movable coupling hole formed so as to extend in the longitudinal direction of the module body so that the axis of the one end of the lever is movable in the longitudinal direction of the movable coupling hole corresponding to the rotation of the lever Wherein said movable coupling hole is adapted to be engaged with said movable coupling hole.
The method of claim 4,

[0028]

And a first boss protruding from both sides of the support to protrude above the support to fix both sides of the elastic support.
The method of claim 5,

The lever

And a second bushing extending from the one end of the lever in the width direction of the lever to thereby make contact with the first roller when the module body is at the maximum distance from the main body.