An intelligent magnetic flux leakage internal detection instrument suitable for pipes of various diameters

Abstract

An intelligent magnetic leakage internal detection instrument suitable for pipes of various diameters, including a sealing joint assembly and a magnetic leakage joint assembly; multiple sets of sealing joint assemblies are flexibly connected, and the rearmost ones are movably connected to the magnetic leakage joint assembly, and each set of sealing joint assemblies includes a sealing joint skeleton, a folding leather cup and a leather cup support assembly; multiple sets of leather cup support assemblies are evenly distributed circumferentially, driving the folding leather cups to swing radially along their respective planes, so that the folding leather cups elastically compress and seal the inner wall of the pipe; the magnetic leakage joint assembly includes a magnetic leakage joint support assembly, an electronic package and a magnetic circuit detection assembly; under the action of the magnetic leakage joint support assembly, multiple sets of magnetic circuit detection assemblies swing radially along their respective planes and always match and stick to the pipe wall, detect pipe wall defects and form magnetic leakage signals to be transmitted to the electronic package for storage. This intelligent magnetic leakage internal detection instrument suitable for pipes of various diameters not only realizes elastic sealing of pipes of different diameters and ensures driving pressure difference, but also realizes magnetic leakage detection of the inner wall of the pipe at the same time.

Description

Technical Field

[0001] The invention relates to the field of pipeline detection, and in particular to an intelligent magnetic leakage internal detection instrument suitable for pipelines of various diameters. Background Art

[0002] Pipelines buried in harsh environments such as underground and on the seabed are prone to damage or corrosion on their inner walls after long-term operation due to geological damage, corrosion, inherent defects, etc., causing a decline in pipeline quality and seriously affecting the safety of pipeline operation. Therefore, it is necessary to conduct internal inspections of the pipelines regularly.

[0003] At present, the main detection instruments in pipelines are magnetic flux leakage (MFL) detectors. Conventional magnetic flux leakage detectors are composed of a magnetization section and a detection system. The magnetization section includes an iron core, a magnetic steel, and a magnetic steel brush.

[0004] The deformation of this detector is about 10%-15%. Due to the limitation of deformation, it can only detect pipes of a certain diameter. When the deformation is large, the pressure of the pipe on the leather cup increases, the wear of the leather cup increases, and the normal operation of the detector is affected. At present, there are a large number of variable diameter pipelines both internationally and domestically, that is, the diameters of the pipes used in a pipeline are different, which leads to the use of conventional leakage magnetic detectors cannot meet the needs of multi-diameter pipeline detection.

[0005] In addition, the magnetization section of the conventional detector is a fixed structure, with an iron core in the middle, magnets of different polarities distributed circumferentially at both ends of the iron core, and steel brushes covering the outer side of the magnets on the inner wall of the pipe. The steel brush is made of steel, and the flexible deformation of the steel brush meets the close contact with the pipe wall, but the deformation of the steel brush is small and can only change within a small range. When the detector passes through a pipe with a large deformation, it will be blocked or the steel brush will be permanently deformed, resulting in detection failure. Summary of the invention

[0006] The present invention provides an intelligent magnetic flux leakage internal detection instrument suitable for pipelines of various diameters, which not only realizes elastic sealing for pipelines of different diameters and ensures driving pressure difference, but also realizes magnetic flux leakage detection of the inner wall of the pipeline at the same time, and is suitable for pipelines with large deformation.

[0007] To achieve the above purpose, the present invention provides an intelligent magnetic flux leakage internal detection instrument suitable for pipes of various diameters, including a sealing joint component and a magnetic flux leakage joint component;

[0008] There are multiple sets of sealing joint components, which are connected flexibly between adjacent ones. The frontmost sealing joint component is provided with a pulling head, and the rearmost sealing joint component is movably connected with the leakage magnetic joint component, and is provided with a mileage component for elastically pressing the pipe wall and measuring the mileage.

[0009] Each set of sealing joint components includes a sealing joint frame, a foldable leather cup and a leather cup support component;

[0010] The foldable leather cup is a frustum-like structure with a variable inclination angle, one end of which is fixed on the sealing joint frame with the same axis;

[0011] Multiple groups of leather cup support assemblies are evenly distributed in the circumferential direction, and one end is fixed on the sealing joint frame, and the other end is connected to the other end of the foldable leather cup. The multiple groups of leather cup support assemblies drive the foldable leather cup to swing radially along their own planes, so that the foldable leather cup elastically compresses and seals the inner wall of the pipeline;

[0012] The leakage magnetic node assembly includes a leakage magnetic node support assembly, an electronic package and a magnetic circuit detection assembly;

[0013] There are multiple groups of magnetic circuit detection components, which are evenly distributed on the outside of the electronic package in the circumferential direction. One end of the electronic package is connected to the coaxial front flange of the leakage magnetic node, and the other end is coaxially connected to the rear flange of the leakage magnetic node.

[0014] The front and rear ends of each set of magnetic circuit detection components are respectively connected to the front flange and the rear flange of the leakage magnetic node through the leakage magnetic node support assembly. Under the action of the leakage magnetic node support assembly, each set of magnetic circuit detection components swings radially along its own plane and is always matched and attached to the pipe wall, so as to detect defects in the pipe wall and form a leakage magnetic signal to be transmitted to the electronic package for storage.

[0015] Furthermore, the leather cup support assembly includes a spring pull rod, a leather cup support outer arm and a leather cup support inner arm arranged in parallel;

[0016] The adjacent two ends of the outer support arm of the leather cup support and the inner support arm of the leather cup support are rotatably mounted on the leather cup support base and the leather cup base respectively, and the connecting line of the four hinge points forms a parallelogram structure;

[0017] The leather cup support base is installed on the sealing joint frame, and the leather cup base is installed on the folding leather cup;

[0018] The spring pull rod pulls the outer support arm of the leather cup support, so that the foldable leather cup elastically presses and seals the inner wall of the pipe.

[0019] Furthermore, the leather cup support assembly also includes a connecting block, two ends of which are respectively connected to the spring pull rod and the end of the outer support arm of the leather cup support, so that the spring pull rod is arranged axially.

[0020] Furthermore, the leather cup support assembly also includes a rotating wheel assembly, and the rotating wheel assembly includes a first rotating wheel, a second rotating wheel and a third rotating wheel;

[0021] The first rotating wheel and the second rotating wheel are rotatably mounted on both sides of the leather cup base, respectively, and the third rotating wheel is rotatably mounted on the middle part of the outer supporting arm of the leather cup support;

[0022] When the inner diameter of the pipeline changes, the first rotor, the second rotor or the third rotor contacts the inner wall of the pipeline accordingly.

[0023] Furthermore, the mileage assembly includes a mileage wheel, a mileage wheel support arm and a mileage wheel base; the mileage wheel base is installed on the leather cup pressure plate, the mileage wheel is installed at one end of the mileage wheel support arm, the other end of the mileage wheel support arm is rotatably connected to the mileage wheel base, and the two ends of the compression spring are respectively pressed into the grooves of the mileage wheel support arm and the mileage wheel base, so that the mileage wheel elastically presses the tube wall and measures the mileage by the number of circumferential rotations.

[0024] Further, the magnetic circuit detection component includes a magnetic circuit component and a detection probe;

[0025] The magnetic circuit assembly is composed of a wear-resistant sheet, magnetic steel, and a yoke, and both ends of the yoke are respectively connected to the leakage magnetic node support assembly;

[0026] The two ends of the yoke are respectively provided with magnetic steel and wear-resistant sheets arranged from the inside to the outside, and the detection probe is installed on the yoke and located between the two magnetic steels;

[0027] A pair of magnets magnetizes the pipe to form an axial magnetic circuit, and the detection probe receives the leakage magnetic signal at the defects of the pipe wall.

[0028] Further, the leakage magnetic node support assembly includes a spring guide rod and a leakage magnetic node support arm;

[0029] One end of the leakage magnetic section support arm is rotatably mounted on the front flange of the leakage magnetic section through the leakage magnetic section support base, and the other end is relatively rotatably and slidably mounted on the magnetic yoke through the leakage magnetic section base;

[0030] The spring guide rod pulls the leakage magnetic section support arm to make the magnetic circuit component match and stick to the pipe wall.

[0031] Furthermore, a strip groove is provided on the leakage magnetic node base, an eighth rotating shaft is provided at one end of the leakage magnetic node support arm, and the eighth rotating shaft is relatively rotatable and slidably arranged in the strip groove.

[0032] Furthermore, the magnetic flux leakage node support assembly also includes a fourth rotating wheel and a fifth rotating wheel;

[0033] The fourth rotating wheel is rotatably mounted on the middle part of the magnetic leakage section support arm, and the fifth rotating wheel is rotatably mounted on the eighth rotating shaft;

[0034] When the inner diameter of the pipeline changes, the fourth rotor or the fifth rotor contacts the inner wall of the pipeline accordingly.

[0035] Furthermore, the sealing joint assembly is divided into three groups, namely the first, second and third sealing joint assemblies from front to back, and adjacent sealing joint assemblies are connected by flexible universal joints; the third sealing joint assembly is connected to the leakage magnetic joint assembly by a cross-axis universal joint;

[0036] A transmitter is arranged on the rear flange of the leakage magnetic section, and the transmitter transmits electromagnetic signals for detection and tracking in the pipeline.

[0037] Compared with the prior art, the intelligent magnetic leakage internal detection instrument applicable to pipes of various diameters drives the foldable leather cup to swing radially along the respective planes through the leather cup support assembly, so that the foldable leather cup elastically compresses and seals the inner wall of the pipe, thereby realizing elastic sealing for pipes of different diameters, ensuring the driving pressure difference, and when entering pipes of different inner diameters, the first rotor, the second rotor and the third rotor correspondingly contact the pipe wall to realize smooth transition, effectively reducing the wear between the foldable leather cup and the inner wall of the pipe without affecting the elastic sealing of the foldable leather cup;

[0038] Because the outer support arm of the leather cup support and the inner support arm of the leather cup support in the leather cup support assembly are connected to each other on the leather cup support base and the leather cup base, and the connecting line of the four hinge points forms a parallelogram structure, when the pipe diameter changes, the leather cup support assembly can be quickly adjusted, and the force is more evenly distributed, ensuring the close contact between the foldable leather cup and the pipe wall, avoiding damage to the foldable leather cup and jamming caused by excessive contact force.

[0039] Since the front and rear ends of the magnetic circuit detection component are respectively supported by the leakage magnetic node support component, under the action of the leakage magnetic node support component, each group of magnetic circuit detection components swings radially along their own planes, matches and is attached to the pipe wall to generate leakage magnetic signals at the defects of the pipe wall, and transmits them to the electronic package for storage. Therefore, the leakage magnetic node component not only meets the needs of pipes of different diameters, but also realizes intelligent detection of the pipe wall by transmitting the leakage magnetic signals at the defects of the pipe wall to the electronic package for storage. It is suitable for pipes with larger deformation and is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is the overall front view of the present invention;

[0041] Figure 2 for Figure 1 Middle AA section view;

[0042] Figure 3 for Figure 1 Middle BB section view;

[0043] Figure 4 for Figure 1 Middle CC section view;

[0044] Figure 5 for Figure 1 Middle DD section view;

[0045] Figure 6 This is a front view of the sealing joint assembly of the present invention;

[0046] Figure 7 It is a schematic diagram of the leather cup support assembly in the present invention;

[0047] Figure 8This is a front view of the leather cup support assembly of the present invention;

[0048] Fig. 9 It is a schematic diagram of the magnetic leakage node assembly in the present invention;

[0049] Fig.10 This is a front view of the connecting block in the present invention;

[0050] In the figure:

[0051] 1. Pulling head, 2. Leather cup support assembly, 3. Folding leather cup, 4. Sealing joint frame, 5. Flexible universal joint, 6. Battery compartment, 7. Mileage assembly, 8. Battery compartment cover, 9. Cross-axis universal joint, 10. Leakage magnetic joint front flange, 11. Leakage magnetic joint support assembly, 12. Electronic package, 13. Detection probe, 14. Junction box, 15. Magnetic circuit, 16. Transmitter, 17. Leakage magnetic joint rear flange, 18. Positioning pin, 19. Compression spring;

[0052] 20. Mileage wheel, 21. Mileage wheel support arm, 22. Mileage wheel base, 23. Junction box base;

[0053] 24. Cup pressure plate, 25. Bolt, 26. Spring pressure cover, 27. First nut, 28. First spring, 29. Cup support base, 30. Cup support outer arm, 31. First rotating shaft, 32. Second rotating shaft, 33. Cup support inner arm, 34. Spring pull rod, 35. Wheel axle, 36. First rotating wheel, 37. Cup base, 38. Second rotating wheel, 39. Fourth rotating shaft, 40. Third rotating shaft, 41. Third rotating wheel, 42. Fifth rotating shaft, 43. Leakage magnetic section support base, 44. Sixth rotating shaft, 44, 45. Fourth rotating wheel, 46. Seventh rotating shaft;

[0054] 47. leakage magnetic section support arm, 48. fifth rotating wheel, 49. eighth rotating shaft, 50. magnetic circuit front support, 51. wear-resistant sheet, 52. magnetic steel, 53. yoke, 54. leakage magnetic section base, 55. second spring, 56. spring end cover, 57. second nut, 58. spring guide rod, 59. first pin shaft, 60. connecting block, 61. second pin shaft. DETAILED DESCRIPTION

[0055] The present invention is further described below in conjunction with the accompanying drawings. For the convenience of description, the multiple sets of sealing joint components connected in sequence are arranged and described in the front-to-back direction, and the side close to the axis direction of their connection is positioned as the inner side, and the side close to the inner wall of the pipe is positioned as the outer side;

[0056] like Figure 1 As shown, the present invention is an intelligent magnetic leakage internal detection instrument suitable for pipelines of various diameters, including a sealing joint component and a magnetic leakage joint component;

[0057] There are multiple groups of sealing joint components, which are connected to each other flexibly. The frontmost sealing joint component is provided with a pulling head 1, and the rearmost sealing joint component is movably connected with the leakage magnetic joint component.

[0058] Preferably, the sealing joint assembly is divided into three groups, namely the first, second and third sealing joint assemblies from front to back, and the adjacent sealing joint assemblies are connected by a flexible universal joint 5, for example, by inserting and fixing the positioning pin 18, and the flexible universal joint 5 is made of flexible polyurethane with a Shore hardness of 60-65A; the third sealing joint assembly is connected to the leakage magnetic joint assembly through a cross-axis universal joint 9;

[0059] A pulling head 1 is connected to the end of the first sealing joint assembly, and the pulling head 1 is connected to the corresponding sealing joint frame 4 through a locking bolt. The pulling head 1 is mainly used to fix the hook when the testing instrument performs a pulling test. The hook is connected to the winch through a wire rope, and the winch pulls the testing instrument forward in the test pipeline;

[0060] like Figure 2 , Figure 6 As shown, each set of sealing joint components includes a sealing joint frame 4, a foldable leather cup 3 and a leather cup support component 2;

[0061] The foldable leather cup 3 is a frustum-like structure with a variable inclination angle, one end of which is fixed on a sealing joint frame 4 with a consistent axis;

[0062] Multiple groups of leather cup support assemblies 2 are evenly distributed in the circumferential direction, and one end is fixed on the sealing joint frame 4, and the other end is connected to the other end of the foldable leather cup 3. The multiple groups of leather cup support assemblies 2 drive the foldable leather cup 3 to swing radially along their respective planes, so that the foldable leather cup 3 elastically compresses and seals the inner wall of the pipeline;

[0063] Preferably, the foldable leather cup 3 is made of flexible polyurethane with a Shore hardness of 80-85A, and the 10 leather cup support components 2 are evenly distributed in the circumferential direction;

[0064] like Figure 7 , Figure 8 As shown, further, the leather cup support assembly 2 includes a spring pull rod 34, a leather cup support outer arm 30 and a leather cup support inner arm 33 arranged in parallel;

[0065] The adjacent two ends of the outer support arm 30 and the inner support arm 33 are rotatably mounted on the leather cup support base 29 and the leather cup base 37 respectively, and the connecting line of the four hinge points forms a parallelogram structure;

[0066] The leather cup support base 29 is installed on the sealing joint frame 4, and the leather cup base 37 is installed on the foldable leather cup 3;

[0067] The spring pull rod 34 pulls the outer support arm 30 of the leather cup support, so that the foldable leather cup 3 elastically compresses and seals the inner wall of the pipeline;

[0068] That is, the cup support base 29 and the sealing joint frame 4 are fixed by locking bolts, and the cup pressure plate 24 on the foldable cup 3 is pressed against the cup base 37 and is tightened and fixed by bolts 25;

[0069] One end of the outer support arm 30 of the leather cup support and one end of the inner support arm 33 of the leather cup support are rotatably mounted on the leather cup support base 29 via the first rotating shaft 31 and the second rotating shaft 32, respectively. The other end of the outer support arm 30 of the leather cup support and the other end of the inner support arm 33 of the leather cup support are rotatably mounted on the leather cup base 37 via the fourth rotating shaft 39 and the third rotating shaft 40, respectively. The first rotating shaft 31, the second rotating shaft 32, the third rotating shaft 40 and the fourth rotating shaft 39 form a parallelogram structure.

[0070] like Figure 8 , Fig.10 As shown, preferably, the leather cup support assembly 2 also includes a connecting block 60, and the two ends of the connecting block 60 are respectively connected to the spring pull rod 34 and the end of the leather cup support outer arm 30, so that the spring pull rod 34 is arranged along the axial direction. Specifically, the two ends of the connecting block 60 are respectively connected to the spring pull rod 34 and the leather cup support outer arm 30 through the first pin shaft 59 and the second pin shaft 61, and the leather cup support outer arm 30 can be an L-shaped bending structure, and the first rotating shaft 31 is located at the bending part of the leather cup support outer arm 30. The end of the leather cup support outer arm 30 is connected to the spring pull rod 34 through the connecting block 60, so that the spring pull rod 34 is arranged along the axial direction, ensuring that the spring pull rod 34 is evenly stressed and more effectively drives the leather cup support outer arm 30 to elastically support;

[0071] The other end of the spring pull rod 34 is screwed and fixed to the sealing joint skeleton 4 through the first nut 27. The spring pull rod 34 is in an elastic tension state, and drives the outer support arm 30 of the leather cup support and the inner support arm 33 of the leather cup support to be stretched outward through the parallelogram structure, and the leather cup support assembly 2 is stretched to the maximum angle, so that the outer edge of the foldable leather cup 3 is always in contact with the inner wall of the pipe; in addition, the spring pull rod 34 can be a pull rod provided with a first spring 28, that is, one end of the pull rod passes through the sealing joint skeleton 4 and is screwed and fixed by the first nut 27, and the first spring 28 is installed on the pull rod, one end of the first spring 28 acts on the sealing joint skeleton 4, and the other end acts on the pull rod. Therefore, under the action of the first spring 28, the outer support arm 30 of the leather cup support and the inner support arm 33 of the leather cup support are stretched outward, and a spring pressure cover 26 can be provided to limit and fix the first spring 28;

[0072] like Figure 7 As shown, further, the leather cup support assembly 2 also includes a rotating wheel assembly, and the rotating wheel assembly includes a first rotating wheel 36, a second rotating wheel 38 and a third rotating wheel 41;

[0073] The first rotating wheel 36 and the second rotating wheel 38 are rotatably mounted on both sides of the leather cup base 37, respectively, and the third rotating wheel 41 is rotatably mounted on the middle of the leather cup support outer arm 30. Preferably, the first rotating wheel 36 is rotatably mounted on the leather cup base 37 through the wheel shaft 35, the second rotating wheel 38 is mounted on the fourth rotating shaft 39, and the third rotating wheel 41 is rotatably mounted on the leather cup support outer arm 30 through the fifth rotating shaft 42;

[0074] When the inner diameter of the pipe changes, the multiple groups of leather cup support assemblies 2 drive the foldable leather cups 3 to swing radially along their respective planes, and at this time, the first rotating wheel 36, the second rotating wheel 38 and the third rotating wheel 41 contact the inner wall of the pipe accordingly;

[0075] Specifically, when the detection instrument enters a pipeline with a larger inner diameter and performs detection, the first rotating wheel 36 and the second rotating wheel 38 located on both sides of the leather cup base 37 contact the inner wall of the pipeline accordingly, reducing the wear between the foldable leather cup 3 and the inner wall of the pipeline. At this time, the foldable leather cup 3 maintains contact and sealing with the pipeline wall; when the detection instrument enters a pipeline with a smaller inner diameter and performs detection, the leather cup support assembly 2 is compressed inwardly, at this time, the third rotating wheel 41 can contact with the inner wall of the pipeline, and a smooth transition can be achieved by the first rotating wheel 36, the second rotating wheel 38 and the third rotating wheel 41 contacting the pipeline wall at the same time. At this time, the foldable leather cup 3 maintains contact and sealing with the pipeline wall;

[0076] like Figure 1 As shown, there is a certain difference between the sealing joint assembly at the rearmost side and the sealing joint assembly at the frontmost side;

[0077] A battery compartment 6 is provided in the sealing joint frame 4 of the rearmost sealing joint assembly, and a mileage assembly 7 for elastically pressing the tube wall and measuring the mileage is provided at the periphery of the foldable leather cup 3;

[0078] Specifically, there is a battery compartment cover 8 on the battery compartment 6 to protect the power supply safety, which is mainly used to provide power for the components that need power in the detection instrument;

[0079] like Figure 1 , Figure 3 As shown, the mileage assembly 7 includes a mileage wheel 20, a mileage wheel support arm 21 and a mileage wheel base 22;

[0080] The mileage wheel base 22 is mounted on the leather cup pressure plate 24, and the mileage wheel 20 is mounted on one end of the mileage wheel support arm 21. In order to effectively rotate the mileage wheel 20, the two sides of the mileage wheel 20 are connected to the mileage wheel support arm 21 through deep groove ball bearings, and the deep groove ball bearings are installed in the circular grooves of the mileage wheel support arm 21. The other end of the mileage wheel support arm 21 is rotatably connected to the mileage wheel base 22, so that the mileage wheel support arm 21 can rotate freely on the mileage wheel base 22. The two ends of the compression spring 19 are respectively pressed into the grooves of the mileage wheel support arm 21 and the mileage wheel base 22, so that the mileage wheel 20 elastically presses the pipe wall and measures the mileage by the number of circumferential rotations;

[0081] like Figure 1 , Fig. 9 , Figure 4 , Figure 5 As shown, the leakage magnetic node assembly includes a leakage magnetic node support assembly 11, an electronic package 12 and a magnetic circuit detection assembly;

[0082] There are multiple groups of magnetic circuit detection components, which are evenly distributed on the outside of the electronic package 12 in the circumferential direction. One end of the electronic package 12 is connected to the coaxial leakage magnetic node front flange 10, and the other end is coaxially connected to the leakage magnetic node rear flange 17;

[0083] The leakage magnetic joint front flange 10 is connected to the sealing joint frame 4 in the adjacent sealing joint assembly, that is, the sealing joint frame 4 is connected to the leakage magnetic joint front flange 10 through the cross-axis universal joint 9;

[0084] The front and rear ends of each group of magnetic circuit detection components are respectively connected to the leakage magnetic section front flange 10 and the leakage magnetic section rear flange 17 through the leakage magnetic section support component 11. Under the action of the leakage magnetic section support component 11, each group of magnetic circuit detection components swings radially along their own planes and always matches and sticks to the pipe wall, so as to detect pipe wall defects and form leakage magnetic signals to be transmitted to the electronic package 12 for storage;

[0085] Further, the magnetic circuit detection component includes a magnetic circuit component and a detection probe 13;

[0086] The magnetic circuit assembly is composed of a wear-resistant sheet 51, a magnetic steel 52, and a yoke 53. Both ends of the yoke 53 are respectively connected to the leakage magnetic node support assembly 11;

[0087] The two ends of the yoke 53 are respectively provided with magnetic steel 52 and wear-resistant sheet 51 arranged from inside to outside. The detection probe 13 is mounted on the yoke 53 by screws and is located between the two magnetic steels 52 .

[0088] Preferably, the wear-resistant sheet 51 is made of carbon steel, and tungsten carbide is sprayed on the surface to improve wear resistance, that is, when the inner diameter of the pipe wall changes, each group of magnetic circuit detection components swings radially along their own planes, and the wear-resistant sheet 51 is always in contact with the pipe wall, thereby avoiding wear on the magnetic steel 52 and the magnetic yoke 53;

[0089] The electronic package 12 is a pressure-resistant cabin that can withstand a pressure of 15 MPa, and the material can be 304 stainless steel;

[0090] The electronic package 12 is provided with a plurality of junction boxes 14 arranged circumferentially and matched with the detection probe 13. The junction boxes 14 are fixed on the electronic package 12 through the junction box base 23. The transmitter 16 is fixed on the flange 17 after the leakage magnetic node and can emit a 22Hz electromagnetic signal for detection and tracking in the pipeline.

[0091] As a preferred embodiment, the magnetic leakage node assembly includes 10 sets of magnetic circuit detection assemblies;

[0092] The structure of the leakage magnetic section support assembly 11 is similar to that of the leather cup support assembly 2, and specifically includes a spring guide rod 58 and a leakage magnetic section support arm 47;

[0093] One end of the leakage magnetic section support arm 47 is rotatably mounted on the leakage magnetic section front flange 10 through the leakage magnetic section support base 43, and the other end is relatively rotatably and slidably mounted on the yoke 53 through the leakage magnetic section base 54;

[0094] The spring guide rod 58 pulls the leakage magnetic node support arm 47 to make the magnetic circuit assembly match and stick to the pipe wall;

[0095] One end of the leakage magnetic segment support arm 47 is relatively rotatable and slidably mounted on the yoke 53 through the leakage magnetic segment base 54. As such an embodiment, the leakage magnetic segment base 54 can be fixed on the yoke 53, on which a strip groove is provided, and one end of the leakage magnetic segment support arm 47 is provided with an eighth rotating shaft 49, which is relatively rotatable and slidably arranged in the strip groove;

[0096] Therefore, when the pipe diameter changes and the leakage magnetic section support arm 47 is elastically adjusted, one end of the leakage magnetic section support arm 47 is relatively rotated with the leakage magnetic section base 54 and slidably mounted on the magnetic yoke 53 to achieve automatic adjustment, which not only makes the magnetic circuit detection component always match and stick to the pipe wall, but also does not affect the fixed connection between the electronic package 12 and the leakage magnetic section front flange 10 and the leakage magnetic section rear flange 17;

[0097] Furthermore, the leakage magnetic node support assembly 11 further includes a fourth rotating wheel 45 and a fifth rotating wheel 48; the fourth rotating wheel 45 is rotatably mounted on the middle of the leakage magnetic node support arm 47, and the fifth rotating wheel 48 is rotatably mounted on the connection point between the leakage magnetic node support arm 47 and the leakage magnetic node base 54, that is, the fifth rotating wheel 48 is mounted on the eighth rotating shaft 49;

[0098] When the inner diameter of the pipeline changes, the plurality of magnetic circuit detection components swing radially along their respective planes and match and stick to the pipeline wall, and the fourth rotating wheel 45 or the fifth rotating wheel 48 contacts the inner wall of the pipeline accordingly;

[0099] Specifically, one end of the leakage magnetic section support arm 47 is rotatably mounted on the leakage magnetic section support base 43 through the sixth rotating shaft 44, and the other end is slidably and rotatably mounted on the leakage magnetic section base 54 through the eighth rotating shaft 49. Correspondingly, the leakage magnetic section support base 43 is fixedly mounted on the leakage magnetic section front flange 10, and the leakage magnetic section base 54 is fixedly mounted on the magnetic yoke 53; the fifth rotating wheel 48 is mounted on the eighth rotating shaft 49, and the fourth rotating wheel 45 is mounted on the leakage magnetic section support arm 47 through the seventh rotating shaft 46;

[0100] A spring guide rod 58 is connected to the leakage magnetic section support arm 47. One end of the spring guide rod 58 is a threaded structure and is pressed against the spring end cover 56 through a second nut 57. The spring guide rod 58 may have its own elastic stretching function, or be a rigid structure on which a second spring 55 providing elastic force is mounted, that is, one end of the second spring 55 acts on the spring guide rod 58 and the other end acts on the spring end cover 56. When the inner diameter of the pipe becomes smaller, the second spring 55 is compressed and the elastic force increases. When the inner diameter of the pipe becomes larger, the second spring 55 acts normally on the spring guide rod 58, so that the leakage magnetic section support arm 47 is closely attached to the pipe wall, and the leakage magnetic section support assembly 11 is stretched to the maximum angle, so that the magnetic circuit assembly matches and is attached to the pipe wall.

[0101] When the detection instrument enters a pipeline with a larger inner diameter and performs detection, under the action of the spring guide rod 58, the fifth wheel 48 contacts the pipe wall, and the magnetic circuit component matches and sticks to the pipe wall to realize detection of the pipe wall; when the detection instrument enters a pipeline with a smaller inner diameter and performs detection, the fifth wheel 48 is compressed, so that the leakage magnetic section support arm 47 is pressed down to a state close to being parallel to the pipe, and the fourth wheel 45 approaches the inner wall of the pipe. When encountering the protrusion of the inner arm of the pipe, the fourth wheel 45 first contacts the protrusion, thereby playing the role of buffering and protecting the magnetic circuit component.

[0102] In actual use, this intelligent magnetic leakage internal detection instrument suitable for pipes of various diameters can have a diameter of 762mm, a total weight of 1190kg, and a total length of 4197mm. When this intelligent magnetic leakage internal detection instrument suitable for pipes of various diameters is used, the detection instrument is placed in pipelines such as oil and gas, and the leather cup support component 2 is changed to adapt to the current pipeline diameter. The foldable leather cup 3 completely seals the pipeline, and the pressure in the pipeline generates a pressure difference on both sides of the foldable leather cup 3. This pressure difference becomes the driving force for the detection instrument to move forward in the pipeline; the change of the magnetic leakage section support component 11 also adapts to the current pipeline diameter, and the magnetic circuit detection component matches the pipe wall and is attached to generate magnetic leakage signals at the defects of the pipe wall, and transmits them to the electronic package 12 for storage, so as to realize intelligent detection of the inner wall of the pipe;

[0103] Specifically, the pulling head 1 can be connected to the corresponding sealing joint frame 4 through the bolt 25, which is mainly used to fix the hook when the testing instrument performs a pulling test. The hook is connected to the winch through a wire rope, and the winch pulls the testing instrument forward in the test pipeline;

[0104] The cup support assembly 2 drives the foldable cup 3 to adapt to different pipe diameters and realizes real-time sealing, ensuring that a driving pressure difference is generated on both sides of the foldable cup 3; when the detection instrument enters a pipe with a larger inner diameter and performs detection, under the action of the spring pull rod 34, the first rotating wheel 36 and the second rotating wheel 38 located on both sides of the cup base 37 contact the inner wall of the pipe accordingly, reducing the wear between the foldable cup 3 and the inner wall of the pipe, and the foldable cup 3 on the cup base 37 contacts the inner diameter of the pipe;

[0105] When the testing instrument enters a pipe with a smaller inner diameter and performs testing, the leather cup support assembly 2 is compressed inward, and the third rotating wheel 41 can contact the inner wall of the pipe. A smooth transition can be achieved by the first rotating wheel 36, the second rotating wheel 38 and the third rotating wheel 41 contacting the pipe wall at the same time, and the foldable leather cup 3 on the leather cup base 37 still maintains contact with the pipe wall.

[0106] Since the outer support arm 30 and the inner support arm 33 of the leather cup support assembly 2 are interconnected on the leather cup support base 29 and the leather cup base 37, and the connecting line of the four hinge points forms a parallelogram structure, when the pipe diameter changes, the leather cup support assembly 2 can be quickly adjusted, and the force is more evenly distributed, ensuring the close contact between the foldable leather cup 3 and the pipe wall, avoiding damage to the foldable leather cup 3 and jamming due to excessive contact force.

[0107] The mileage assembly 7 is provided on the sealing joint assembly at the rear end, that is, the mileage wheel 20 is installed at one end of the mileage wheel support arm 21, and the mileage wheel 20 is elastically pressed against the pipe wall by the compression spring 19 in the groove of the mileage wheel support arm 21 and the mileage wheel base 22. During driving, the mileage wheel 20 rotates circumferentially to measure the mileage;

[0108] A pair of magnetic flux leakage node support components 11 drive the corresponding magnetic circuit detection components to swing radially along their respective planes, and are matched and attached to the pipe wall to detect pipe wall defects, and form magnetic flux leakage signals to be transmitted to the electronic package 12 for storage;

[0109] That is, when the detection instrument enters a pipeline with a larger inner diameter and performs detection, under the action of the spring guide rod 58, the fifth rotating wheel 48 installed at the connection point between the leakage magnetic section support arm 47 and the leakage magnetic section base 54 is rotated to contact the inner wall of the pipeline accordingly, so that the magnetic circuit detection component matches and sticks to the pipe wall, avoiding the magnetic circuit detection component from directly contacting the pipe wall and causing wear; when the detection instrument enters a pipeline with a smaller inner diameter and performs detection, a pair of leakage magnetic section support assemblies 11 drive the magnetic circuit detection assembly to be compressed inward, and the fifth rotating wheel 48 is compressed. At this time, due to the leakage magnetic One end of the section support arm 47 is relatively rotated and slidably installed on the yoke 53 through the leakage magnetic section base 54, that is, the leakage magnetic section support arm 47 is adjusted so that when the magnetic circuit detection component is compressed inward, the electronic package 12 remains in a normal state, and the front and rear ends are respectively connected to the leakage magnetic section front flange 10 and the leakage magnetic section rear flange 17, the leakage magnetic section support arm 47 is pressed down to a state close to being parallel to the pipeline, and the fourth rotor 45 is close to the inner wall of the pipeline. When encountering the protrusion of the inner arm of the pipeline, the fourth rotor 45 first contacts the protrusion, thereby playing a role in buffering and protecting the magnetic circuit component.

[0110] The magnetic circuit detection component moves forward in the pipeline, and the magnetic steel 52 in the magnetic circuit component is adsorbed on the inner wall of the pipeline and magnetizes the pipeline to form an axial magnetic circuit, and the detection probe 13 is located between the two magnetic steels 52, that is, the detection probe 13 is located between S and N of the magnetic circuit 15, receiving the leakage magnetic signal at the defect of the pipe wall, and transmitting the signal to the electronic package 12, and the electronic package 12 stores all the signals collected by the detection probe 13. When the detection instrument is completed, the equipment is recycled, and the information stored in the electronic package 12 is analyzed by the host computer, and an analysis report is issued for the inspected pipeline, thereby realizing the leakage magnetic detection of the inner wall of the pipeline;

[0111] The present invention is an intelligent magnetic leakage internal detection instrument suitable for pipes with various diameters. The leather cup support assembly 2 drives the foldable leather cup 3 to swing radially along the respective planes, so that the foldable leather cup 3 elastically compresses and seals the inner wall of the pipe. Therefore, the present invention is suitable for pipes with different diameters. The leather cup support assembly 2 adopts a parallelogram structure. When the pipe diameter changes, the leather cup support assembly 2 can be adjusted quickly and evenly stressed, thereby ensuring close contact between the foldable leather cup 3 and the pipe wall, while avoiding damage to the foldable leather cup 3 and jamming caused by excessive contact force.

[0112] The front and rear ends of the magnetic circuit detection assembly are respectively supported by the leakage magnetic node support assembly 11. Under the action of the leakage magnetic node support assembly 11, each group of magnetic circuit detection assemblies swings radially along their own planes, and matches and sticks to the pipe wall to generate leakage magnetic signals at the defects of the pipe wall, and transmits them to the electronic package 12 for storage. Therefore, the leakage magnetic node assembly not only meets the needs of pipes of different diameters, but also realizes intelligent detection of the pipe wall by transmitting the leakage magnetic signals at the defects of the pipe wall to the electronic package 12 for storage, which is more convenient.

[0113] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An intelligent magnetic flux leakage internal detection instrument suitable for pipes of various diameters, including a sealing joint assembly and a magnetic flux leakage joint assembly; It is characterized in that There are multiple groups of sealing joint components, which are connected flexibly to each other. The frontmost sealing joint component is provided with a pulling head (1), and the rearmost sealing joint component is movably connected to the leakage magnetic joint component and is provided with a mileage component (7) for elastically pressing the pipe wall and measuring the mileage. Each set of sealing joint components includes a sealing joint frame (4), a foldable leather cup (3) and a leather cup support component (2); The foldable leather cup (3) is a frustum-like structure with a variable inclination angle, one end of which is fixed on a sealing joint frame (4) with a consistent axis; A plurality of leather cup support assemblies (2) are evenly distributed in the circumferential direction, one end of which is fixed on the sealing joint frame (4) and the other end of which is connected to the other end of the foldable leather cup (3). The plurality of leather cup support assemblies (2) drive the foldable leather cup (3) to swing radially along their own planes, so that the foldable leather cup (3) elastically compresses and seals the inner wall of the pipeline; The magnetic leakage node assembly comprises a magnetic leakage node support assembly (11), an electronic package (12) and a magnetic circuit detection assembly; The magnetic circuit detection components are multiple groups and are evenly distributed on the outside of the electronic package (12) in the circumferential direction. One end of the electronic package (12) is connected to the coaxial leakage magnetic flux node front flange (10), and the other end is coaxially connected to the leakage magnetic flux node rear flange (17). The front and rear ends of each group of magnetic circuit detection components are respectively connected to the leakage magnetic node front flange (10) and the leakage magnetic node rear flange (17) through the leakage magnetic node support component (11). Under the action of the leakage magnetic node support component (11), each group of magnetic circuit detection components swings radially along its own plane and is always matched and attached to the pipe wall, so as to detect pipe wall defects and form a leakage magnetic signal to be transmitted to the electronic package (12) for storage.

2. The intelligent magnetic flux leakage internal detection instrument applicable to pipes of various diameters according to claim 1 is characterized in that: The leather cup support assembly (2) comprises a spring pull rod (34), a leather cup support outer arm (30) and a leather cup support inner arm (33) arranged in parallel; The adjacent two ends of the outer support arm (30) of the leather cup support and the inner support arm (33) of the leather cup support are rotatably mounted on the leather cup support base (29) and the leather cup base (37) respectively, and the connecting line of the four hinge points forms a parallelogram structure; The leather cup support base (29) is mounted on the sealing joint frame (4), and the leather cup base (37) is mounted on the foldable leather cup (3); The spring pull rod (34) pulls the outer support arm (30) of the leather cup support, so that the foldable leather cup (3) elastically compresses and seals the inner wall of the pipeline.

3. The intelligent magnetic flux leakage internal detection instrument applicable to pipes of various diameters according to claim 2 is characterized in that: The leather cup support assembly (2) further comprises a connecting block (60), the two ends of which are respectively connected to the spring pull rod (34) and the end of the leather cup support outer arm (30), so that the spring pull rod (34) is arranged along the axial direction.

4. The intelligent magnetic flux leakage internal detection instrument applicable to pipes of various diameters according to claim 2, characterized in that: The leather cup support assembly (2) further comprises a rotating wheel assembly, wherein the rotating wheel assembly comprises a first rotating wheel (36), a second rotating wheel (38) and a third rotating wheel (41); The first rotating wheel (36) and the second rotating wheel (38) are rotatably mounted on both sides of the leather cup base (37), respectively, and the third rotating wheel (41) is rotatably mounted on the middle part of the outer supporting arm (30) of the leather cup support; When the inner diameter of the pipeline changes, the first rotating wheel (36), the second rotating wheel (38) or the third rotating wheel (41) contacts the inner wall of the pipeline accordingly.

5. The intelligent magnetic flux leakage internal detection instrument applicable to pipes of various diameters according to claim 4, characterized in that: The mileage assembly (7) comprises a mileage wheel (20), a mileage wheel support arm (21) and a mileage wheel base (22); the mileage wheel base (22) is mounted on a leather cup pressure plate (24); the mileage wheel (20) is mounted on one end of the mileage wheel support arm (21); the other end of the mileage wheel support arm (21) is rotatably connected to the mileage wheel base (22); two ends of a compression spring (19) are respectively pressed into grooves of the mileage wheel support arm (21) and the mileage wheel base (22), so that the mileage wheel (20) is elastically pressed against the pipe wall and the mileage is measured by the number of circumferential rotations.

6. An intelligent magnetic flux leakage internal detection instrument suitable for pipes of various diameters according to any one of claims 2 to 5, characterized in that: The magnetic circuit detection component comprises a magnetic circuit component and a detection probe (13); The magnetic circuit component is composed of a wear-resistant sheet (51), a magnetic steel (52), and a magnetic yoke (53), and both ends of the magnetic yoke (53) are respectively connected to the leakage magnetic node support component (11); The two ends of the magnetic yoke (53) are respectively provided with magnetic steel (52) and wear-resistant sheet (51) arranged from the inside to the outside, and the detection probe (13) is installed on the magnetic yoke (53) and is located between the two magnetic steels (52); A pair of magnetic steels (52) magnetizes the pipeline to form an axial magnetic circuit, and a detection probe (13) receives leakage magnetic signals at defects on the pipeline wall.

7. The intelligent magnetic flux leakage internal detection instrument applicable to pipes of various diameters according to claim 6, characterized in that: The leakage magnetic node support assembly (11) comprises a spring guide rod (58) and a leakage magnetic node support arm (47); One end of the leakage magnetic section support arm (47) is rotatably mounted on the leakage magnetic section front flange (10) through the leakage magnetic section support base (43), and the other end is relatively rotatably and slidably mounted on the magnetic yoke (53) through the leakage magnetic section base (54); The spring guide rod (58) pulls the leakage magnetic node support arm (47) to make the magnetic circuit component match and stick to the pipe wall.

8. The intelligent magnetic flux leakage internal detection instrument applicable to pipes of various diameters according to claim 7, characterized in that: The leakage magnetic node base (54) is provided with a strip groove, and one end of the leakage magnetic node support arm (47) is provided with an eighth rotating shaft (49), and the eighth rotating shaft (49) is relatively rotatable and slidably arranged in the strip groove.

9. The intelligent magnetic flux leakage internal detection instrument applicable to pipes of various diameters according to claim 7, characterized in that: The magnetic flux leakage node support assembly (11) further includes a fourth rotating wheel (45) and a fifth rotating wheel (48); The fourth rotating wheel (45) is rotatably mounted on the middle part of the magnetic flux leakage node support arm (47), and the fifth rotating wheel (48) is rotatably mounted on the eighth rotating shaft (49); When the inner diameter of the pipeline changes, the fourth rotating wheel (45) or the fifth rotating wheel (48) contacts the inner wall of the pipeline accordingly.

10. The intelligent magnetic flux leakage internal detection instrument applicable to pipes of various diameters according to claim 9, characterized in that: The sealing joint components are divided into three groups, namely the first, second and third sealing joint components from front to back, and adjacent sealing joint components are connected via flexible universal joints (5); the third sealing joint component is connected to the leakage magnetic joint component via a cross-axis universal joint (9); A transmitter (16) is provided on the leakage magnetic post flange (17), and the transmitter (16) emits an electromagnetic signal for detection and tracking inside the pipeline.

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