WO2023193330A1

WO2023193330A1 - Magnetic flux leakage detection mechanism for pipeline detection

Info

Publication number: WO2023193330A1
Application number: PCT/CN2022/096078
Authority: WO
Inventors: 王平; 朱江; 吴海君; 徐维磊; 孙忠宁; 孔梦红; 张馨晨; 许全; 刘昊宇; 王鹏程; 李荣茂; 赵战军
Original assignee: 南京派光高速载运智慧感知研究院有限公司
Priority date: 2022-04-08
Filing date: 2022-05-30
Publication date: 2023-10-12
Also published as: CN217505731U

Abstract

Disclosed is a magnetic flux leakage detection mechanism for pipeline detection, comprising a fixing assembly, a magnetic member, a plurality of acquisition supports, and a plurality of magnetic field sensors. The fixing assembly is sleeved on the outside of the magnetic member; the acquisition supports are uniformly distributed on the periphery of the fixing assembly; the acquisition supports can be unfolded and folded relative to the fixing assembly; and the magnetic field sensors are correspondingly provided on the acquisition supports. An intense magnetic field is applied to a pipeline by means of the magnetic member and is parallel to the axis direction of the pipeline. The acquisition supports cause the magnetic field sensors to be close to the pipeline, such that a change in the magnetic field of the pipeline can be conveniently detected by means of the magnetic field sensors; and the acquisition supports can be unfolded and folded relative to the fixing assembly, such that the magnetic flux leakage detection mechanism can be suitable for pipelines having different pipe diameters, is simple in overall structure, and is low in cost.

Description

A magnetic flux leakage detection mechanism for pipeline detection

Technical field

The utility model relates to the technical field of pipeline detection, and in particular to a magnetic flux leakage detection mechanism for pipeline detection.

Background technique

When a ferromagnetic steel pipe is fully magnetized, the magnetic field lines in the pipe wall are blocked by defects on the surface or near the surface. The magnetic field lines at the defects are distorted, and part of the magnetic field lines leak out of the inner and outer surfaces of the steel pipe, forming a leakage magnetic field. An electromagnetic detection method that uses detection elements to detect leakage magnetic fields to find defects, that is, magnetic leakage detection. When the detection element located on the surface of the steel pipe and moving relative to the steel pipe picks up the leakage magnetic field and converts it into a defect electrical signal, the signal reflecting the defect can be obtained through the probe, thereby determining and processing the defect. However, the existing detection elements have a relatively complex structure and a high cost.

Utility model content

The main technical problem solved by the utility model is to provide a magnetic flux leakage detection mechanism for pipeline detection, which solves the problems of relatively complex structure and high cost.

In order to solve the above technical problems, one technical solution adopted by this utility model is to provide a magnetic flux leakage detection mechanism for pipeline detection, which includes a fixed component, a magnetic component, a plurality of collection brackets and a plurality of magnetic field sensors. The fixed component Set on the outside of the magnetic component, the collection bracket is evenly distributed around the periphery of the fixed component. The collection bracket can be opened and closed relative to the fixed component, and the magnetic field sensor is correspondingly arranged on the fixed component. On the collection bracket; the fixed component includes a sleeve, a wire loop, an end cover and a plurality of hinge plates, the hinge plates are evenly distributed at the front end of the outer wall of the sleeve and are used to hinge the collection bracket, and the The magnetic component is arranged at the front end of the sleeve, the wire loop is arranged at the rear side of the sleeve, and the end cap is closed at the rear end of the sleeve.

Preferably, the magnetic field sensor is connected to a first cable, the sleeve and wire loop are provided with a plurality of corresponding wire holes in the radial direction, and the sleeve, wire loop and end cover are all provided with wire holes in the axial direction, The wire hole is used to guide the first cable into the threading hole, and the threading hole is used to lead out the first cable.

Preferably, the collection bracket includes a support rod and an elastic member. The front end of the support rod is hinged to the hinge plate through a hinge shaft, and the elastic member is provided between the support rod and the outer wall of the fixed component. , used to enable the support rods to be opened and closed.

Preferably, the elastic member is a torsion spring, and the torsion spring includes a spiral portion, and first and second torsion arms on both sides of the spiral portion. The spiral portion is sleeved on the outside of the hinge shaft. , the first torsion arm is in contact with the inner wall of the support rod, and the second torsion arm is in contact with the outer wall of the sleeve.

Preferably, the support rod includes a first curved portion on the front side and a second curved portion on the rear side, the bending direction of the middle part of the first bending part is away from the sleeve, and the bending direction of the middle part of the second bending part is direction towards the sleeve.

Preferably, a first roller is provided at the front end of the second curved portion, and a second roller is provided at the rear end of the second curved portion.

Preferably, the first bending portion has a mounting portion extending outward, and the first torsion arm resists inside the mounting portion.

Preferably, an intermediate portion extends from the front side of the mounting portion in the direction of the sleeve, the intermediate portion is provided with a through hole, and the first torsion arm is inserted into the through hole.

Preferably, a mounting hole is provided at the upper mounting portion of the middle portion, and the magnetic field sensor is disposed in the mounting hole.

The beneficial effect of the utility model is that a strong magnetic field is applied to the pipeline through the magnetic component and is parallel to the axis direction of the pipeline. The magnetic field sensor is placed adjacent to the pipeline through the acquisition bracket, which facilitates the detection of changes in the magnetic field of the pipeline through the magnetic field sensor. The acquisition bracket can be opened and closed relative to the fixed component, making the magnetic flux leakage detection mechanism suitable for pipelines with different diameters. The overall structure Simple and low cost.

Description of the drawings

Figure 1 is a schematic structural diagram of the front side of the magnetic flux leakage detection mechanism according to one embodiment of the utility model for pipeline detection;

Figure 2 is a schematic structural diagram of the rear side of the magnetic flux leakage detection mechanism according to one embodiment of the utility model for pipeline detection.

Figure 3 is a schematic cross-sectional structural view of a fixed component of a magnetic flux leakage detection mechanism for pipeline detection according to one embodiment of the present invention;

Figure 4 is a schematic diagram of the exploded structure of the fixed assembly of an embodiment of the magnetic flux leakage detection mechanism for pipeline detection according to the present invention;

Figure 5 is a schematic structural diagram of a support rod according to an embodiment of a magnetic flux leakage detection mechanism for pipeline detection according to the present invention.

Detailed ways

In order to facilitate understanding of the present utility model, the present utility model will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. The preferred embodiments of the present utility model are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. Rather, these embodiments are provided to provide a thorough and comprehensive understanding of the disclosure.

It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as commonly understood by those skilled in the technical field belonging to the present invention. The terms used in the description of the present invention are only for the purpose of describing specific embodiments and are not used to limit the present invention. As used in this specification, the term "and/or" includes any and all combinations of one or more of the associated listed items.

For the description of the present invention, the symbols "front", "back", "upper", "lower", "left" and "right" shown in Figure 1 are used without limitation to facilitate understanding of the embodiment, and are not intended to Limit this utility model. Among them, the front and rear direction represents the horizontal direction, the left and right direction represents the longitudinal direction, and the up and down direction represents the vertical direction.

Figures 1 to 5 show an embodiment of the magnetic flux leakage detection mechanism 10 of the present invention for pipeline detection, which includes a fixed component 101, a magnetic component 102, a plurality of collection brackets 103 and a plurality of magnetic field sensors 104. The fixed component 101 is sleeved on the outside of the magnetic component 102. The collection bracket 103 is evenly distributed around the periphery of the fixed component 101. The collection bracket 103 can be opened and closed relative to the fixed component 101. The magnetic field sensor 104 is correspondingly arranged on the collection bracket 103.

In the present utility model, the magnetic component 102 is a magnet, a permanent magnet, etc. The magnetic field sensor 104 is a Hall sensor or the like, and applies a strong magnetic field to the pipe through the magnetic component 102 parallel to the axis of the pipe. The magnetic field sensor 104 is placed adjacent to the pipeline through the collection bracket 103 to facilitate detection of changes in the magnetic field of the pipeline through the magnetic field sensor 104. The collection bracket 103 can be opened and closed relative to the fixed component 101, making the magnetic flux leakage detection mechanism 10 suitable for different pipe diameters. The overall structure of the pipeline is simple and the cost is low.

Further, as shown in Figures 3 and 4, the fixing assembly 101 includes a sleeve 1011, a wire loop 1012, an end cover 1013 and a plurality of hinge plates 1014. The hinge plates 1014 are evenly distributed at the front end of the outer wall of the sleeve 1011. On the hinged collection bracket 103, the magnetic component 102 is provided at the front end of the sleeve 1011. The front end of the magnetic component 102 is provided with a gasket 1015. The wire loop 1012 is provided on the rear side of the sleeve 1011. The end cap 1013 is closed on the sleeve. 1011 backend. The first cable can be easily drawn out through the wire loop 1012, and the magnetic component 102 can be prevented from shaking.

Preferably, the magnetic field sensor 104 is connected to a first cable (not shown in the figure), and the first cable can supply power to the magnetic field sensor 104 and transmit signals. The sleeve 1011 and the wire ring 1012 are provided with a plurality of wire holes 1016 in the radial direction. The end caps of the sleeve 1011, the

wire ring

1012 and 1013 are provided with wire holes 105 in the axial direction. The wire holes 1016 are used to guide the first cable into the wire holes. In 105, the threading hole 105 is used to lead out the first cable. In this way, the first cable can be led out from the inside of the fixing component 101 to prevent the first cable from being entangled with the collection bracket 103 on the outside.

The collection bracket 103 can be opened and closed relative to the fixed assembly 101 through a telescopic rod. That is, the fixed end of the telescopic rod is set on the fixed component 101, and the collection bracket 103 is set on the free end of the telescopic rod. However, this method has a more complex structure and higher cost.

Preferably, as shown in Figures 1, 2 and 4, the collection bracket 103 is provided with a support rod 1031 and an elastic member. The front end of the support rod 1031 is hinged with the hinge plate 1014 through the hinge shaft 1033. The elastic member The member is disposed between the support rod 1031 and the outer wall of the sleeve 1011 to enable the support rod 1031 to open and close. The support rod 1031 can be opened and closed through elastic parts, which has a simple structure and low cost.

The elastic member can be a spring, and the spring can be directly provided between the sleeve 1011 and the rear end of the strut 1031. When the magnetic flux leakage detection mechanism 10 is put into the pipe, the spring is compressed, and the strut 1031 can be closed to resist the inner wall of the pipe. . This makes the collection bracket 103 suitable for pipes with different diameters. When the inner diameter of the pipe is larger, the spring pushes the support rod 1031 outward, and the support rod 1031 is appropriately opened so that the support rod 1031 always resists the inner wall of the pipe. . The structure of the spring is unstable and easy to fall off and deform.

Preferably, the elastic member is a torsion spring 1032. The torsion spring 1032 includes a spiral portion 10321, and a first torsion arm 10322 and a second torsion arm 10323 on both sides of the spiral portion 10321. The spiral portion 10321 is sleeved on the outside of the hinge shaft 1033. One torsion arm 10322 is in contact with the inner wall of the support rod 1031, and the second torsion arm 10323 is in contact with the outer wall of the sleeve 1011. The support rod 1031 is always pressed against the inner wall of the pipe by the torsion spring 1032. The collection bracket 103 is adapted to pipes of different diameters.

Preferably, as shown in FIG. 5 , the support rod 1031 includes a first bending part 1034 on the front side and a second bending part 1035 on the rear side. The bending direction of the middle part of the first bending part 1034 is away from the sleeve 1011 , and the second bending part The bending direction of the middle part of 1035 is toward the sleeve 1011.

Since the first curved portion 1034 is away from the sleeve 1011, the collection bracket 103 can be easily entered into the pipeline. When the pipe diameter is small, the first bend 1034 may contact the inner wall of the pipe. The second bending part 1035 is bent into the sleeve 1011. When the pipe diameter is large, the rear end of the first bending part 1034 and the rear end of the second bending part 1035 can contact the inner wall of the pipe at the same time. This can improve the stability of the magnetic flux leakage detection mechanism 10 when moving.

Preferably, the first bending portion 1034 has a mounting portion 1039 extending outward, and the first torsion arm 10322 resists the mounting portion 1039 . The torsion spring 1032 is limited to the lower side of the support rod 1031 by the mounting portion 1039, which facilitates the installation and use of the torsion spring 1032.

Preferably, as shown in Figure 5, an intermediate portion 1038 extends from the front side of the mounting portion 1039 in the direction of the sleeve 1011. The intermediate portion 1038 is provided with a through hole, and the first twist arm 10322 is inserted through inside the through hole. The torsion spring 1032 is limited by the intermediate portion 1038 to prevent the torsion spring 1032 from slipping.

Preferably, a mounting hole 10311 is provided at the mounting portion 1039 above the middle portion 1038, and the magnetic field sensor 104 is disposed in the mounting hole 10311. Installing the magnetic field sensor 104 through the mounting hole 10311 does not affect the detection of the magnetic field by the magnetic field sensor 104 and facilitates the introduction of the first cable from the wire ring 1012 into the threading hole 105 .

When the torsion spring 1032 presses the strut 1031 against the inner wall of the pipe, if the first bending part 1034 and the second bending part 1035 are in direct contact with the inner wall of the pipe, the friction force will be large when moving, making it inconvenient and easy to move. causing damage to the pipeline.

In order to solve the above problems. Preferably, a first roller 1036 is provided at the front end of the second curved portion 1035, and a second roller 1037 is provided at the rear end of the second curved portion 1035. By contacting the first roller 1036 and the second roller 1037 with the inner wall of the pipeline, the magnetic flux leakage detection mechanism 10 can be facilitated to move smoothly in the pipeline, and the collection bracket 103 can be prevented from causing damage to the inner wall of the pipeline.

It can be seen that the utility model discloses a magnetic flux leakage detection mechanism for pipeline detection, which applies a strong magnetic field to the pipeline through a magnetic component and is parallel to the axis direction of the pipeline. The magnetic field sensor is placed adjacent to the pipeline through the acquisition bracket, which facilitates the detection of changes in the magnetic field of the pipeline through the magnetic field sensor. The acquisition bracket can be opened and closed relative to the fixed component, making the magnetic flux leakage detection mechanism suitable for pipelines with different diameters. The overall structure Simple and low cost.

The above are only examples of the present utility model, and do not limit the patent scope of the present utility model. Any equivalent structural transformation made using the contents of the description and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be regarded as Likewise, it is included in the patent protection scope of this utility model.

Claims

A magnetic flux leakage detection mechanism for pipeline detection, which is characterized in that it includes a fixed component, a magnetic component, a plurality of collection brackets and a plurality of magnetic field sensors, the fixed component is set on the outside of the magnetic component, and the The collection bracket is evenly distributed around the periphery of the fixed component. The collection bracket can be opened and closed relative to the fixed component. The magnetic field sensor is correspondingly arranged on the collection bracket; the fixed component includes a sleeve. , wire loops, end caps and multiple hinge plates. The hinge plates are evenly distributed at the front end of the outer wall of the sleeve and are used to hinge the collection bracket. The magnetic component is arranged at the front end of the sleeve. The wire loop is arranged on the rear side of the sleeve, and the end cap is closed on the rear end of the sleeve.
The magnetic flux leakage detection mechanism for pipeline detection according to claim 1, wherein the magnetic field sensor is connected to a first cable, and the sleeve and the wire ring are provided with a plurality of corresponding wire holes in the radial direction. The sleeve, the wire ring and the end cover are all provided with threading holes in the axial direction. The wire holes are used to guide the first cable into the threading holes. The threading holes are used to insert the first cable into the threading holes. Cable export.
The magnetic flux leakage detection mechanism for pipeline detection according to claim 1, wherein the collection bracket includes a support rod and an elastic member, and the front end of the support rod is hinged with the hinge plate through a hinge shaft. The elastic member is disposed between the support rod and the outer wall of the fixing component to enable the support rod to open and close.
The magnetic flux leakage detection mechanism for pipeline detection according to claim 3, characterized in that the elastic member is a torsion spring, the torsion spring includes a spiral part, and first torsion arms and The second torsion arm, the spiral part is sleeved on the outside of the hinge shaft, the first torsion arm is against the inner wall of the support rod, and the second torsion arm is against the outer wall of the sleeve. .
The magnetic flux leakage detection mechanism for pipeline detection according to claim 3, wherein the support rod includes a first bending part on the front side and a second bending part on the rear side, and the middle part of the first bending part The bending direction of the second bending portion is away from the sleeve, and the bending direction of the middle portion of the second bending portion is toward the sleeve.
The magnetic flux leakage detection mechanism for pipeline detection according to claim 5, wherein a first roller is provided at the front end of the second bending portion, and a second roller is provided at the rear end of the second bending portion.
The magnetic flux leakage detection mechanism for pipeline detection according to claim 5, wherein the first bending portion has a mounting portion extending outward, and the first torsion arm resists the inside of the mounting portion.
The magnetic flux leakage detection mechanism for pipeline detection according to claim 7, wherein an intermediate portion extends from the front side of the mounting portion in the direction of the sleeve, and a through hole is provided on the intermediate portion, and the The first torsion arm is disposed in the through hole.
The magnetic flux leakage detection mechanism for pipeline detection according to claim 8, wherein a mounting hole is provided at the upper mounting portion of the middle portion, and the magnetic field sensor is disposed in the mounting hole.