CN114965675B - An intelligent magnetic flux leakage internal detection instrument suitable for pipes of various diameters - Google Patents
An intelligent magnetic flux leakage internal detection instrument suitable for pipes of various diameters Download PDFInfo
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- CN114965675B CN114965675B CN202210372451.2A CN202210372451A CN114965675B CN 114965675 B CN114965675 B CN 114965675B CN 202210372451 A CN202210372451 A CN 202210372451A CN 114965675 B CN114965675 B CN 114965675B
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- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
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Abstract
一种适用于多种直径管道的智能漏磁内检测仪器，包括密封节组件和漏磁节组件；多组密封节组件之间柔性连接，最后侧的与漏磁节组件活动连接，每组密封节组件包括密封节骨架、折叠型皮碗和皮碗支撑组件；多组皮碗支撑组件周向均布、带动折叠型皮碗沿各自的平面径向摆动，使得折叠型皮碗对管道内壁弹性压紧密封；漏磁节组件包括漏磁节支撑组件、电子包和磁路检测组件；在漏磁节支撑组件作用下，多组磁路检测组件沿各自的平面径向摆动并与管壁始终匹配、贴设，检测管壁缺陷并形成漏磁信号传输至电子包进行储存。本适用于多种直径管道的智能漏磁内检测仪器，不仅实现对不同管径的弹性密封，保障驱动压差，而且同时实现对管道内壁的漏磁检测。
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
The invention relates to the field of pipeline detection, in particular to an intelligent magnetic flux leakage inner detection instrument suitable for pipelines with various diameters.
Background
The pipeline buried in severe environments such as underground, seabed and the like is easy to damage or corrode due to geological damage, corrosion, self defects and the like after long-time operation, and the quality of the pipeline is reduced, so that the operation safety of the pipeline is seriously affected, and the pipeline is required to be periodically subjected to internal detection.
At present, a magnetic leakage (MFL) detector is mainly used as an in-pipeline detection instrument, and the conventional magnetic leakage detector consists of a magnetization section and a detection system, wherein the magnetization section comprises an iron core, magnetic steel and a magnetic conduction steel brush.
The deformation of the detector is about 10% -15%, and the detector is limited by the deformation, so that the detector can only detect the pipeline with a certain pipeline diameter, and when the deformation is large, the pressure of the pipeline to the leather cup is increased, the abrasion of the leather cup is increased, and the normal operation of the detector is influenced.
In addition, the magnetizing section of the conventional detector is of a fixed structure, the middle part is an iron core, magnets with different polarities are circumferentially distributed at two ends of the iron core, and the outer side of each magnet is covered with a steel brush on the inner wall structure of the pipeline. The steel brush is made of steel materials, and the tight contact with the pipe wall is met through the flexible deformation of the steel brush, but the deformation of the steel brush is small and can only be changed in a small range. When the detector passes through a pipeline with large deformation, blocking or permanent deformation of the steel brush can occur, so that detection fails.
Disclosure of Invention
The invention provides an intelligent magnetic flux leakage inner detection instrument suitable for pipelines with various diameters, which not only realizes the elastic sealing of pipelines with different diameters and ensures the driving pressure difference, but also realizes the magnetic flux leakage detection of the inner wall of the pipeline, and is suitable for pipelines with larger deformation.
In order to achieve the purpose, the intelligent magnetic leakage internal detection instrument suitable for the pipelines with various diameters comprises a sealing joint assembly and a magnetic leakage joint assembly;
The sealing joint assemblies are multiple groups, adjacent sealing joint assemblies are connected through flexible connection, a traction head is arranged on the sealing joint assembly at the foremost side, the sealing joint assembly at the rearmost side is movably connected with the magnetic leakage joint assembly, and a mileage assembly for elastically compacting a pipe wall and measuring the driving mileage is arranged on the sealing joint assembly;
Each group of sealing joint components comprises a sealing joint framework, a folding leather cup and a leather cup supporting component;
the folding leather cup is of a frustum-like structure with a variable inclination angle, and one end of the folding leather cup is fixed on a sealing joint framework with a consistent axis;
The plurality of groups of leather cup supporting components are circumferentially and uniformly distributed, one end of each leather cup supporting component is fixed on the sealing joint framework, the other end of each leather cup supporting component is connected with the other end of the folding leather cup, and the plurality of groups of leather cup supporting components drive the folding leather cup to radially swing along respective planes, so that the folding leather cup elastically compresses and seals the inner wall of the pipeline;
the magnetic leakage joint assembly comprises a magnetic leakage joint supporting assembly, an electronic package and a magnetic circuit detection assembly;
The magnetic circuit detection assemblies are multiple groups and are circumferentially and uniformly distributed on the outer side of the electronic package, one end of the electronic package is connected with the coaxial magnetic leakage joint front flange, and the other end of the electronic package is coaxially connected with the magnetic leakage joint rear flange;
The front end and the rear end of each magnetic circuit detection assembly are respectively connected with the front flange of the magnetic leakage joint and the rear flange of the magnetic leakage joint through the magnetic leakage joint support assembly, and under the action of the magnetic leakage joint support assembly, each magnetic circuit detection assembly is swung along the radial direction of the respective plane and is always matched with the pipe wall, and is attached to the pipe wall for detecting the defects of the pipe wall, and a magnetic leakage signal is formed and transmitted to an electronic package for storage.
Further, the leather cup supporting component comprises a spring pull rod, a leather cup supporting outer support arm and a leather cup supporting inner support arm which are arranged in parallel;
two adjacent ends of the outer support arm and the inner support arm of the leather cup support are respectively rotatably arranged on the leather cup support base and the leather cup base, and the connecting lines of four hinge points form a parallelogram structure;
the leather cup supporting base is arranged on the sealing joint framework, and the leather cup base is arranged on the folding leather cup;
The spring pull rod pulls the leather cup to support the outer support arm, so that the folding leather cup elastically compresses and seals the inner wall of the pipeline.
Further, the leather cup supporting component further comprises a connecting block, and two ends of the connecting block are respectively connected with the spring pull rod and the end head of the leather cup supporting outer support arm, so that the spring pull rod is axially arranged.
Further, the leather cup supporting assembly further comprises a rotating wheel assembly, wherein the rotating wheel assembly comprises a first rotating wheel, a second rotating wheel and a third rotating wheel;
the first rotating wheel and the second rotating wheel are respectively and rotatably arranged at two sides of the leather cup base, and the third rotating wheel is rotatably arranged at the middle part of the leather cup supporting outer support arm;
when the inner diameter of the pipeline changes, the first rotating wheel, the second rotating wheel or the third rotating wheel correspondingly contacts with the inner wall of the pipeline.
The mileage assembly comprises a mileage wheel, a mileage wheel support arm and a mileage wheel base, wherein the mileage wheel base is arranged on a leather cup pressing plate, the mileage wheel is arranged at one end of the mileage wheel support arm, the other end of the mileage wheel support arm is rotationally connected with the mileage wheel base, and two ends of a pressure spring are respectively pressed into grooves of the mileage wheel support arm and the mileage wheel base, so that the mileage wheel is elastically pressed against a pipe wall and the driving mileage is measured through the number of circumferential rotation turns.
Further, the magnetic circuit detection assembly comprises a magnetic circuit assembly and a detection probe;
The magnetic circuit assembly consists of wear-resisting sheets, magnetic steel and a magnetic yoke, and two ends of the magnetic yoke are respectively connected with the magnetic leakage joint support assembly;
the two ends of the magnetic yoke are respectively provided with magnetic steel and wear-resistant sheets which are arranged from inside to outside, and the detection probe is arranged on the magnetic yoke and is positioned between the two magnetic steels;
The pair of magnetic steels magnetize the pipeline to form an axial magnetic loop, and the detection probe receives a magnetic leakage signal at the defect of the pipeline wall.
Further, the magnetic leakage joint support assembly comprises a spring guide rod and a magnetic leakage joint support arm;
One end of the magnetic leakage joint supporting arm is rotatably arranged on the magnetic leakage joint front flange through the magnetic leakage joint supporting base, and the other end of the magnetic leakage joint supporting arm is relatively rotatably and slidably arranged on the magnetic yoke through the magnetic leakage joint base;
the spring guide rod pulls the magnetic leakage joint supporting arm to enable the magnetic circuit assembly to be matched with the pipe wall and attached to the pipe wall.
Further, the magnetic leakage joint base is provided with a strip-shaped groove, one end of the magnetic leakage joint supporting arm is provided with an eighth rotating shaft, and the eighth rotating shaft rotates relatively and is arranged in the strip-shaped groove in a sliding mode.
Further, the magnetic leakage joint support assembly further comprises a fourth rotating wheel and a fifth rotating wheel;
The fourth rotating wheel is rotatably arranged in the middle of the magnetic leakage joint supporting arm, and the fifth rotating wheel is rotatably arranged on the eighth rotating shaft;
when the inner diameter of the pipeline changes, the fourth rotating wheel or the fifth rotating wheel is correspondingly contacted with the inner wall of the pipeline.
Furthermore, the sealing joint assemblies are three groups, namely a first sealing joint assembly, a second sealing joint assembly and a third sealing joint assembly from front to back in sequence, and the adjacent sealing joint assemblies are connected through flexible universal joints;
and a transmitter is arranged on the rear flange of the magnetic leakage joint, and the transmitter transmits electromagnetic signals and is used for detecting and tracking in the pipeline.
Compared with the prior art, the intelligent magnetic flux leakage internal detection instrument suitable for the pipelines with various diameters has the advantages that the folding leather cup is driven to swing radially along respective planes by the leather cup supporting component, so that the folding leather cup is elastically pressed and sealed on the inner wall of the pipeline, the elastic sealing of different pipe diameters is realized, the driving pressure difference is ensured, and when the intelligent magnetic flux leakage internal detection instrument enters the pipelines with different inner diameters, the first rotating wheel, the second rotating wheel and the third rotating wheel are correspondingly contacted with the pipe wall to realize stable transition, so that the abrasion between the folding leather cup and the inner wall of the pipeline is effectively reduced under the condition that the elastic sealing of the folding leather cup is not influenced;
Because the outer support arm of the leather cup support in the leather cup support assembly and the inner support arm of the leather cup support are mutually connected on the leather cup support base and the leather cup base, and the connecting lines of the four hinge points form a parallelogram structure, when the pipe diameter changes, the leather cup support assembly can be used for quickly adjusting, the stress is more uniform, the close contact between the folding leather cup and the pipe wall is ensured, and the situation that the folding leather cup is damaged and blocked due to overlarge contact force is avoided.
Because both ends support through magnetic circuit detection component's front and back respectively through magnetic leakage section supporting component, under magnetic leakage section supporting component effect, every magnetic circuit detection component of group radially swings along respective plane to match with the pipe wall and paste and establish the magnetic leakage signal that is used for producing pipe wall defect department, and transmit to the electronics package and store, consequently make magnetic leakage section component not only satisfy different diameter pipe diameters, but also through the magnetic leakage signal with pipe wall defect department, and transmit to the electronics package and store, realize the intellectual detection system to the pipe wall, be applicable to the pipeline of great deflection, it is more convenient.
Drawings
FIG. 1 is a front view of the whole of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken along B-B in FIG. 1;
FIG. 4 is a cross-sectional view taken along line C-C of FIG. 1;
FIG. 5 is a sectional view taken along the direction D-D in FIG. 1;
FIG. 6 is a front view of a seal joint assembly of the present invention;
FIG. 7 is a schematic view of a cup support assembly according to the present invention;
FIG. 8 is a front view of a cup support assembly of the present invention;
FIG. 9 is a schematic view of a magnetic flux leakage joint assembly according to the present invention;
FIG. 10 is a front view of a connection block of the present invention;
In the figure:
1. The device comprises a traction head, 2, a leather cup supporting component, 3, a folding leather cup, 4, a seal joint framework, 5, a flexible universal joint, 6, a battery compartment, 7, a mileage component, 8, a battery compartment cover, 9, a cross shaft universal joint, 10, a magnetic flux leakage joint front flange, 11, a magnetic flux leakage joint supporting component, 12, an electronic package, 13, a detection probe, 14, a wire collecting box, 15, a magnetic circuit, 16, a transmitter, 17, a magnetic flux leakage joint rear flange, 18, a positioning pin, 19 and a pressure spring;
20. the device comprises a mileage wheel, 21, a mileage wheel support arm, 22, a mileage wheel base, 23 and a junction box base;
24. A cup pressing plate, 25, a bolt, 26, a spring gland, 27, a first nut, 28, a first spring, 29, a cup supporting base, 30, a cup supporting outer support arm, 31, a first rotating shaft, 32, a second rotating shaft, 33, a cup supporting inner support arm, 34, a spring pull rod, 35, a wheel axle, 36, a first rotating wheel, 37, a cup base, 38, a second rotating wheel, 39, a fourth rotating shaft, 40, a third rotating shaft, 41, a third rotating wheel, 42, a fifth rotating shaft, 43, a magnetic leakage joint supporting base, 44, a sixth rotating shaft 44,45, a fourth rotating wheel, 46 and a seventh rotating shaft;
47. the magnetic leakage joint comprises a magnetic leakage joint support arm, 48, a fifth rotating wheel, 49, an eighth rotating shaft, 50, a magnetic circuit front support, 51, wear plates, 52, magnetic steel, 53, a magnetic yoke, 54, a magnetic leakage joint base, 55, a second spring, 56, a spring end cover, 57, a second nut, 58, a spring guide rod, 59, a first pin, 60, a connecting block, 61 and a second pin.
Detailed Description
The invention is further described below with reference to the accompanying drawings, and for convenience of description, a plurality of groups of seal joint assemblies connected in sequence are arranged and described according to the front-back direction, and are positioned as the inner side near the axis direction of connection, and one side near the inner wall of the pipeline is the outer side;
as shown in FIG. 1, the intelligent magnetic leakage internal detection instrument suitable for pipelines with various diameters comprises a sealing joint assembly and a magnetic leakage joint assembly;
The sealing joint assemblies are multiple groups, adjacent sealing joint assemblies are connected through flexible connection, a traction head 1 is arranged on the sealing joint assembly at the foremost side, and the sealing joint assembly at the rearmost side is movably connected with the magnetic leakage joint assembly;
Preferably, the seal joint assemblies are three groups, namely a first seal joint assembly, a second seal joint assembly and a third seal joint assembly from front to back in sequence, the adjacent seal joint assemblies are connected through a flexible universal joint 5, for example, the seal joint assemblies are fixed by inserting a positioning pin 18, the flexible universal joint 5 is made of flexible polyurethane, and the Shore hardness is 60-65A;
The end part of the first sealing joint component is connected with a traction head 1, the traction head 1 is connected with a corresponding sealing joint framework 4 through a locking bolt, a hook is fixed when the detection instrument performs a traction experiment, the hook is connected with a winch through a steel wire rope, and the winch pulls the detection instrument to move forwards in a test pipeline;
As shown in fig. 2 and 6, each group of seal joint assemblies comprises a seal joint framework 4, a folding cup 3 and a cup support assembly 2;
the folding leather cup 3 is of a frustum-like structure with a variable inclination angle, and one end of the folding leather cup is fixed on a sealing joint framework 4 with the same axis;
The plurality of groups of cup supporting components 2 are uniformly distributed circumferentially, one end of each cup supporting component is fixed on the seal joint framework 4, the other end of each cup supporting component is connected with the other end of the folding cup 3, and the plurality of groups of cup supporting components 2 drive the folding cup 3 to swing radially along respective planes, so that the folding cup 3 is elastically pressed and sealed on the inner wall of the pipeline;
preferably, the folding leather cup 3 is made of flexible polyurethane, the Shore hardness is 80-85A, and the 10 leather cup support components 2 are uniformly distributed in the circumferential direction;
As shown in fig. 7 and 8, further, the cup support assembly 2 includes a spring pull rod 34, a cup support outer arm 30 and a cup support inner arm 33, which are arranged in parallel;
The two adjacent ends of the cup supporting outer support arm 30 and the cup supporting inner support arm 33 are respectively rotatably arranged on the cup supporting base 29 and the cup base 37, and the connecting lines of four hinge points form a parallelogram structure;
The cup support base 29 is arranged on the seal joint framework 4, and the cup base 37 is arranged on the folding cup 3;
The spring pull rod 34 pulls the cup support outer support arm 30 to enable the folding cup 3 to elastically press and seal the inner wall of the pipeline;
namely, the cup supporting base 29 and the seal joint framework 4 are fixed through locking bolts, and the cup pressing plate 24 on the folding cup 3 is pressed on the cup base 37 and is screwed and fixed through bolts 25;
One end of the cup supporting outer support arm 30 and one end of the cup supporting inner support arm 33 are correspondingly and rotatably arranged on the cup supporting base 29 through a first rotating shaft 31 and a second rotating shaft 32, the other end of the cup supporting outer support arm 30 and the other end of the cup supporting inner support arm 33 are correspondingly and rotatably arranged on the cup base 37 through a fourth rotating shaft 39 and a third rotating shaft 40, and 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;
As shown in fig. 8 and 10, the cup support assembly 2 preferably further includes a connection block 60, and both ends of the connection block 60 are respectively connected to the spring tie rod 34 and the ends of the cup support outer arm 30, so that the spring tie rod 34 is disposed in the axial direction. The two ends of the connecting block 60 are correspondingly connected with the spring pull rod 34 and the cup support outer support arm 30 through a first pin shaft 59 and a second pin shaft 61 respectively, the cup support outer support arm 30 can be of an L-shaped bending structure, the first rotating shaft 31 is positioned at the bending position of the cup support outer support arm 30, and the end head of the cup support outer support arm 30 is connected with the spring pull rod 34 through the connecting block 60, so that the spring pull rod 34 is axially arranged, the spring pull rod 34 is uniformly stressed, and the cup support outer support arm 30 is driven to elastically support more effectively;
The other end of the spring pull rod 34 is fixedly connected to the seal joint framework 4 in a threaded manner through the first nut 27, the spring pull rod 34 is in an elastic tension state, the outer support arm 30 and the inner support arm 33 of the cup support are driven to be outwards spread through the parallelogram structure, the cup support assembly 2 is spread to a maximum angle, the outer edge of the folding cup 3 is always contacted with the inner wall of a pipeline, in addition, the spring pull rod 34 can be a pull rod provided with a first spring 28, namely one end of the pull rod passes through the seal joint framework 4 and is fixedly connected through the first nut 27 in a threaded manner, the pull rod is sleeved with the first spring 28, one end of the first spring 28 acts on the seal joint framework 4, the other end acts on the pull rod, therefore, under the action of the first spring 28, the outer support arm 30 and the inner support arm 33 of the cup support are outwards spread, and the spring gland 26 can be arranged, and the first spring 28 is subjected to limit fixation;
as shown in fig. 7, further, the cup support assembly 2 further includes a wheel assembly including a first wheel 36, a second wheel 38, and a third wheel 41;
the first rotating wheel 36 and the second rotating wheel 38 are respectively and rotatably arranged at two sides of the leather cup base 37, the third rotating wheel 41 is rotatably arranged at the middle part of the leather cup supporting outer support arm 30, preferably, the first rotating wheel 36 is rotatably arranged on the leather cup base 37 through a wheel shaft 35, the second rotating wheel 38 is arranged on a fourth rotating shaft 39, and the third rotating wheel 41 is rotatably arranged on the leather cup supporting outer support arm 30 through a fifth rotating shaft 42;
When the inner diameter of the pipeline changes, the plurality of groups of leather cup supporting components 2 drive the folding leather cup 3 to swing radially along respective planes, and at the moment, the first rotating wheel 36, the second rotating wheel 38 and the third rotating wheel 41 correspondingly contact with the inner wall of the pipeline;
When the detection instrument enters a pipeline with a larger inner diameter and is detected, the first rotating wheel 36 and the second rotating wheel 38 which are positioned at two sides of the leather cup base 37 are correspondingly contacted with the inner wall of the pipeline, so that the abrasion between the folding leather cup 3 and the inner wall of the pipeline is reduced, and the folding leather cup 3 is kept in contact and sealed with the pipe wall;
As shown in fig. 1, the rearmost seal joint assembly differs from the frontmost seal joint assembly in some way;
A battery compartment 6 is arranged in the seal joint framework 4 of the seal joint assembly at the rearmost side, and a mileage assembly 7 which elastically compresses the pipe wall and measures the mileage is arranged at the periphery of the folding leather cup 3;
Specifically, a battery cabin cover 8 is arranged on the battery cabin 6 to protect the safety of a power supply, and the battery cabin cover mainly provides the power supply for parts needing to be used for power in the detection instrument;
as shown in fig. 1 and 3, the mileage component 7 includes a mileage wheel 20, a mileage wheel support arm 21, and a mileage wheel base 22;
The mileage wheel base 22 is installed on the leather cup pressing plate 24, the mileage wheel 20 is installed at one end of the mileage wheel support arm 21, in order to make the mileage wheel 20 effectively rotate, two sides of the mileage wheel 20 are connected with the mileage wheel support arm 21 through deep groove ball bearings, the deep groove ball bearings are installed in circular grooves of the mileage wheel support arm 21, and the other end of the mileage wheel support arm 21 is rotationally connected with the mileage wheel base 22, so that the mileage wheel support arm 21 can freely rotate on the mileage wheel base 22. Two ends of the pressure 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 elastically compresses the pipe wall and measures the driving mileage through the number of turns in the circumferential direction;
as shown in fig. 1, 9, 4 and 5, the magnetic leakage joint assembly comprises a magnetic leakage joint support assembly 11, an electronic package 12 and a magnetic circuit detection assembly;
the magnetic circuit detection assemblies are multiple groups and are circumferentially and uniformly distributed on the outer side of the electronic package 12, one end of the electronic package 12 is connected with the coaxial magnetic leakage joint front flange 10, and the other end of the electronic package 12 is coaxially connected with the magnetic leakage joint rear flange 17;
the front magnetic leakage joint flange 10 is connected with the seal joint framework 4 in the adjacent seal joint assembly, namely the seal joint framework 4 is connected with the front magnetic leakage joint flange 10 through a cross shaft universal joint 9;
The front end and the rear end of each magnetic circuit detection assembly are respectively connected with a magnetic leakage joint front flange 10 and a magnetic leakage joint rear flange 17 through a magnetic leakage joint support assembly 11, and under the action of the magnetic leakage joint support assembly 11, each magnetic circuit detection assembly is radially swung along a respective plane, is always matched with the pipe wall and is attached to the pipe wall, and is used for detecting the defects of the pipe wall, forming a magnetic leakage signal and transmitting the magnetic leakage signal to an electronic package 12 for storage;
further, the magnetic circuit detection assembly comprises a magnetic circuit assembly and a detection probe 13;
the magnetic circuit assembly consists of wear-resisting sheets 51, magnetic steel 52 and a magnetic yoke 53, and two ends of the magnetic yoke 53 are respectively connected with the magnetic leakage joint supporting assembly 11;
The two ends of the magnetic yoke 53 are respectively provided with a magnetic steel 52 and wear-resisting plates 51 which are arranged from inside to outside, and the detection probe 13 is mounted on the magnetic yoke 53 by screws and is positioned between the two magnetic steels 52.
Preferably, the wear-resistant plate 51 is made of carbon steel, and tungsten carbide is sprayed on the surface of the wear-resistant plate to improve wear resistance, namely, when the inner diameter of the pipe wall changes, each group of magnetic circuit detection components swing radially along respective planes, and the wear-resistant plate 51 always contacts with the pipe wall to avoid abrasion of the magnetic steel 52 and the magnetic yoke 53;
the electronic package 12 is a pressure-resistant cabin capable of bearing 15MPa pressure, and the material of the electronic package is 304 stainless steel;
The electronic package 12 is provided with a plurality of bus bars 14 which are circumferentially arranged and are connected with the detection probes 13 in a matching way, the bus bars 14 are fixedly arranged on the electronic package 12 through bus bar bases 23, and the transmitter 16 is fixedly arranged on the magnetic leakage joint rear flange 17 and can transmit 22Hz electromagnetic signals for detection and tracking in a pipeline.
As a preferred embodiment, the magnetic leakage joint assembly comprises 10 groups of magnetic circuit detection assemblies;
The magnetic leakage joint support assembly 11 has a similar structure to the leather cup support assembly 2, and specifically comprises a spring guide rod 58 and a magnetic leakage joint support arm 47;
One end of the magnetic leakage section supporting arm 47 is rotatably mounted on the magnetic leakage section front flange 10 through the magnetic leakage section supporting base 43, and the other end is relatively rotatably and slidably mounted on the magnetic yoke 53 through the magnetic leakage section base 54;
The spring guide rod 58 pulls the magnetic leakage joint supporting arm 47 to enable the magnetic circuit assembly to be matched with the pipe wall and attached to the pipe wall;
one end of the magnetic leakage section supporting arm 47 is relatively rotated and slidably mounted on the magnetic yoke 53 through the magnetic leakage section base 54, as an example, a strip-shaped groove is formed on the magnetic leakage section base 54, an eighth rotating shaft 49 is formed at one end of the magnetic leakage section supporting arm 47, and the eighth rotating shaft 49 is relatively rotated and slidably disposed in the strip-shaped groove;
Therefore, when the pipe diameter changes and the magnetic leakage joint support arm 47 is elastically adjusted, one end of the magnetic leakage joint support arm 47 is relatively rotated with the magnetic leakage joint base 54 and is slidably arranged on the magnetic yoke 53, so that automatic adjustment is realized, the magnetic circuit detection assembly is always matched with the pipe wall and is attached to the pipe wall, and the fixed connection between the electronic package 12 and the magnetic leakage joint front flange 10 and the magnetic leakage joint rear flange 17 is not influenced;
Further, the magnetic leakage joint support assembly 11 further comprises a fourth rotating wheel 45 and a fifth rotating wheel 48, wherein the fourth rotating wheel 45 is rotatably arranged in the middle of the magnetic leakage joint support arm 47, the fifth rotating wheel 48 is rotatably arranged at the connection point between the magnetic leakage joint support arm 47 and the magnetic leakage joint base 54, namely, the fifth rotating wheel 48 is arranged on the eighth rotating shaft 49;
When the inner diameter of the pipeline changes, the magnetic circuit detection assemblies swing radially along the respective planes, are matched with the pipeline wall and are attached to the pipeline wall, and the fourth rotating wheel 45 or the fifth rotating wheel 48 correspondingly contacts with the inner wall of the pipeline;
Specifically, one end of a magnetic leakage joint support arm 47 is rotatably arranged on a magnetic leakage joint support base 43 through a sixth rotating shaft 44, the other end of the magnetic leakage joint support arm is slidably and rotatably arranged on a magnetic leakage joint base 54 through an eighth rotating shaft 49, the corresponding magnetic leakage joint support base 43 is fixedly arranged on a magnetic leakage joint front flange 10, the magnetic leakage joint base 54 is fixedly arranged on a magnetic yoke 53, a fifth rotating wheel 48 is arranged on the eighth rotating shaft 49, and a fourth rotating wheel 45 is arranged on the magnetic leakage joint support arm 47 through a seventh rotating shaft 46;
The magnetic leakage joint support arm 47 is connected with a spring guide rod 58, one end of the spring guide rod 58 is in a threaded structure and is pressed on the spring end cover 56 through a second nut 57, the spring guide rod 58 can have an elastic stretching function, or a second spring 55 which provides elastic force is sleeved on the rigid structure, namely one end of the second spring 55 acts on the spring guide rod 58, the other end acts on the spring end cover 56, when the inner diameter of a pipeline is reduced, the second spring 55 is compressed, the elastic force is increased, and when the inner diameter of the pipeline is increased, the second spring 55 normally acts on the spring guide rod 58, so that the magnetic leakage joint support arm 47 is clung to the pipe wall, the magnetic leakage joint support assembly 11 is supported to the maximum angle, and the magnetic circuit assembly is matched with the pipe wall and is attached;
When the detecting instrument enters the pipeline with the larger inner diameter and is detected, the fifth rotating wheel 48 is contacted with the pipeline wall under the action of the spring guide rod 58, the magnetic circuit assembly is matched with and attached to the pipeline wall to realize the detection of the pipeline wall, and when the detecting instrument enters the pipeline with the smaller inner diameter and is detected, the fifth rotating wheel 48 is pressed, so that the magnetic leakage joint supporting arm 47 is pressed down to be close to a state parallel to the pipeline, the fourth rotating wheel 45 is close to the inner wall of the pipeline, and the fourth rotating wheel 45 is firstly contacted with the bulge when the inner arm bulge of the pipeline is encountered, so that the effect of buffering and protecting the magnetic circuit assembly is realized.
In practical use, the diameter of the intelligent magnetic flux leakage internal detection instrument suitable for pipelines with various diameters can be 762mm, the total weight is 1190kg, and the total length is 4197mm. When the intelligent magnetic leakage internal detection instrument suitable for pipelines with various diameters is used, the detection instrument is placed in pipelines such as oil gas and the like, the current pipeline diameter is adapted through the change of the leather cup supporting component 2, the folding leather cup 3 completely seals the pipeline, the pressure in the pipeline generates pressure difference at two sides of the folding leather cup 3, the pressure difference becomes power for driving the detection instrument to move forwards in the pipeline, the change of the magnetic leakage joint supporting component 11 also adapts to the current pipeline diameter, the magnetic circuit detecting component is matched with the pipeline wall and is attached to the pipeline wall to generate a magnetic leakage signal at the defect position of the pipeline wall, and the magnetic leakage signal is transmitted to the electronic package 12 for storage, so that the intelligent detection on the inner wall of the pipeline wall is realized;
The traction head 1 can be connected with a corresponding sealing joint framework 4 through bolts 25, a hook is fixed mainly when the detection instrument performs traction experiments, the hook is connected with a winch through a steel wire rope, and the winch pulls the detection instrument to move forwards in a test pipeline;
When the detection instrument enters a pipeline with a larger inner diameter and is detected, under the action of the spring pull rod 34, the first rotating wheel 36 and the second rotating wheel 38 which are positioned at the two sides of the leather cup base 37 correspondingly contact with the inner wall of the pipeline, so that the abrasion between the folding leather cup 3 and the inner wall of the pipeline is reduced, and the folding leather cup 3 on the leather cup base 37 contacts with the inner diameter of the pipeline;
when the detecting instrument enters a pipeline with a smaller inner diameter and is detected, the leather cup supporting component 2 is compressed inwards, at the moment, the third rotating wheel 41 can be in contact with the inner wall of the pipeline, smooth transition can be realized by simultaneously contacting the first rotating wheel 36, the second rotating wheel 38 and the third rotating wheel 41 with the pipe wall, and the folding leather cup 3 on the leather cup base 37 still keeps contact with the pipe wall;
Because the outer support arm 30 of the cup support in the cup support assembly 2 and the inner support arm 33 of the cup support are mutually connected on the cup support base 29 and the cup base 37, and the connecting lines of the four hinge points form a parallelogram structure, when the pipe diameter changes, the cup support assembly 2 can be quickly adjusted, the stress is more uniform, the tight contact between the folding cup 3 and the pipe wall is ensured, and the damage and blockage of the folding cup 3 caused by overlarge contact force are avoided.
The mileage component 7 is arranged on the seal joint component at the rearmost side, namely, the mileage wheel 20 is arranged at one end of the mileage wheel support arm 21, and the mileage wheel 20 elastically compresses the pipe wall through the pressure spring 19 in the grooves of the mileage wheel support arm 21 and the mileage wheel base 22, and the mileage is measured by the number of turns of the mileage wheel 20 in the circumferential direction in the running process;
The pair of magnetic flux leakage joint supporting components 11 drive the corresponding magnetic circuit detecting components to swing radially along respective planes, are matched with the pipe wall and are attached to the pipe wall for detecting the pipe wall defects, and form magnetic flux leakage signals to be transmitted to the electronic package 12 for storage;
When the detecting instrument enters a pipeline with a larger inner diameter and is detected, the fifth rotating wheel 48 is rotatably arranged at the position of the connecting point of the magnetic leakage joint supporting arm 47 and the magnetic leakage joint base 54 under the action of the spring guide rod 58, so that the magnetic circuit detecting component is matched with and attached to the inner wall of the pipeline, the magnetic circuit detecting component is prevented from being directly contacted with the pipeline, when the detecting instrument enters the pipeline with a smaller inner diameter and is detected, the pair of magnetic leakage joint supporting components 11 drive the magnetic circuit detecting component to be compressed inwards, the fifth rotating wheel 48 is pressed, at the moment, one end of the magnetic leakage joint supporting arm 47 is relatively rotated and slidably arranged on the magnetic yoke 53 through the magnetic leakage joint base 54, namely, when the magnetic circuit detecting component is compressed inwards through the magnetic leakage joint supporting arm 47, the electronic package 12 is still kept in a normal state, the front end and the rear end of the magnetic circuit detecting component are respectively connected with the magnetic leakage joint front flange 10 and the magnetic leakage joint rear flange 17, the magnetic leakage joint supporting arm 47 is pressed down to be close to a state parallel to the pipeline, and the fourth rotating wheel 45 is close to the inner wall, and the fourth rotating wheel 45 is contacted with the protruding rotating wheel 45 when the inner wall is protruded, so that the magnetic circuit is buffered.
The magnetic circuit detection assembly moves forwards in the pipeline, the magnetic steel 52 in the magnetic circuit assembly is adsorbed on the inner wall of the pipeline and magnetizes the pipeline to form an axial magnetic loop, the detection probe 13 is positioned between the two magnetic steels 52, namely, the detection probe 13 is positioned between S and N of the magnetic circuit 15, magnetic leakage signals at the defect position of the pipeline wall are received, the signals are transmitted to the electronic package 12, and the electronic package 12 stores the signals acquired by all the detection probes 13. After the detection of the detection instrument is finished, the equipment is recovered, the information stored in the electronic package 12 is analyzed through the upper computer, and an analysis report is given for the detected pipeline, so that the magnetic flux leakage detection of the inner wall of the pipeline is realized;
The intelligent magnetic flux leakage inner detection instrument is suitable for pipelines with various diameters, the folding type leather cup 3 is driven to swing radially along respective planes through the leather cup supporting component 2, so that the folding type leather cup 3 is elastically pressed and sealed on the inner wall of the pipeline, the intelligent magnetic flux leakage inner detection instrument is suitable for the use with different pipe diameters, the leather cup supporting component 2 adopts a parallelogram structure, when the pipe diameters change, the leather cup supporting component 2 can be rapidly adjusted, and the stress is uniform, the tight contact between the folding type leather cup 3 and the pipe wall is ensured, and the damage to the folding type leather cup 3 and the blocking situation caused by overlarge contact force are avoided;
The front end and the rear end of the magnetic circuit detection assembly are respectively supported through the magnetic leakage joint support assemblies 11, each magnetic circuit detection assembly swings radially along the respective plane under the action of the magnetic leakage joint support assemblies 11, is matched with the tube wall and is attached with the magnetic leakage signals for generating tube wall defect positions, and is transmitted to the electronic package 12 for storage, so that the magnetic leakage joint assemblies not only meet the tube diameters of different diameters, but also are transmitted to the electronic package 12 for storage through the magnetic leakage signals of the tube wall defect positions, intelligent detection of the tube wall is realized, and the magnetic leakage joint detection assembly is more convenient.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An intelligent magnetic leakage internal detection instrument suitable for pipelines with various diameters comprises a sealing joint assembly and a magnetic leakage joint assembly;
it is characterized in that the method comprises the steps of,
The sealing joint assemblies are multiple groups, adjacent sealing joint assemblies are connected through flexible connection, a traction head (1) is arranged on the sealing joint assembly at the foremost side, the sealing joint assembly at the rearmost side is movably connected with the magnetic leakage joint assembly, and a mileage assembly (7) for elastically compacting a pipe wall and measuring the mileage is arranged on the sealing joint assembly;
each group of seal joint components comprises a seal joint framework (4), a folding leather cup (3) and a leather cup supporting component (2);
The folding leather cup (3) is of a frustum-like structure with a variable inclination angle, and one end of the folding leather cup is fixed on a sealing joint framework (4) with the same axis;
The plurality of groups of leather cup supporting components (2) are circumferentially and uniformly distributed, one end of each leather cup supporting component is fixed on the sealing joint framework (4), the other end of each leather cup supporting component is connected with the other end of the folding leather cup (3), and the plurality of groups of leather cup supporting components (2) drive the folding leather cups (3) to swing radially along respective planes, so that the folding leather cups (3) are elastically pressed and sealed on the inner wall of the pipeline;
The magnetic leakage joint assembly comprises a magnetic leakage joint supporting assembly (11), an electronic package (12) and a magnetic circuit detection assembly;
The magnetic circuit detection assemblies are multiple groups and are circumferentially and uniformly distributed on the outer side of the electronic package (12), one end of the electronic package (12) is connected with the coaxial magnetic leakage joint front flange (10), and the other end of the electronic package is coaxially connected with the magnetic leakage joint rear flange (17);
The front end and the rear end of each magnetic circuit detection assembly are respectively connected with a magnetic leakage joint front flange (10) and a magnetic leakage joint rear flange (17) through magnetic leakage joint support assemblies (11), and under the action of the magnetic leakage joint support assemblies (11), each magnetic circuit detection assembly is radially swung along respective planes and is always matched and attached to the pipe wall, so that defects of the pipe wall are detected, and a magnetic leakage signal is formed and transmitted to an electronic package (12) for storage.
2. An intelligent magnetic flux leakage inner detection instrument suitable for pipelines with various diameters according to claim 1, wherein the cup support assembly (2) comprises a spring pull rod (34), a cup support outer support arm (30) and a cup support inner support arm (33) which are arranged in parallel;
two adjacent ends of the outer support arm (30) and the inner support arm (33) are respectively rotatably arranged on the leather cup support base (29) and the leather cup base (37), and the connecting lines of the four hinge points form a parallelogram structure;
the leather cup supporting base (29) is arranged on the sealing joint framework (4), and the leather cup base (37) is arranged on the folding leather cup (3);
the spring pull rod (34) pulls the leather cup to support the outer support arm (30), so that the folding leather cup (3) elastically compresses and seals the inner wall of the pipeline.
3. The intelligent magnetic flux leakage inner detection instrument suitable for the pipelines with various diameters according to claim 2, wherein the leather cup supporting assembly (2) further comprises a connecting block (60), and two ends of the connecting block (60) are respectively connected with the spring pull rod (34) and the end heads of the leather cup supporting outer support arm (30) so that the spring pull rod (34) is axially arranged.
4. An intelligent magnetic flux leakage internal detection instrument suitable for pipes with various diameters according to claim 2, characterized in that the cup support assembly (2) further comprises a runner assembly comprising a first runner (36), a second runner (38) and a third runner (41);
the first rotating wheel (36) and the second rotating wheel (38) are respectively and rotatably arranged at two sides of the leather cup base (37), and the third rotating wheel (41) is rotatably arranged at the middle part of the leather cup supporting outer support arm (30);
When the inner diameter of the pipeline changes, the first rotating wheel (36), the second rotating wheel (38) or the third rotating wheel (41) is respectively contacted with the inner wall of the pipeline.
5. The intelligent magnetic flux leakage internal detection instrument suitable for the pipelines with various diameters according to claim 4 is characterized in that the mileage component (7) comprises mileage wheels (20), mileage wheel supporting arms (21) and mileage wheel bases (22), the mileage wheel bases (22) are arranged on leather cup pressing plates (24), the mileage wheels (20) are arranged at one ends of the mileage wheel supporting arms (21), the other ends of the mileage wheel supporting arms (21) are rotationally connected with the mileage wheel bases (22), and two ends of a pressure spring (19) are respectively pressed into grooves of the mileage wheel supporting arms (21) and the mileage wheel bases (22) so that the mileage wheels (20) elastically compress the pipelines and measure the driving mileage through circumferential rotation turns.
6. An intelligent magnetic leakage internal detection instrument suitable for pipelines with various diameters according to any one of claims 2 to 5, wherein the magnetic circuit detection assembly comprises a magnetic circuit assembly and a detection probe (13);
The magnetic circuit assembly consists of wear-resisting sheets (51), magnetic steel (52) and a magnetic yoke (53), and two ends of the magnetic yoke (53) are respectively connected with the magnetic leakage joint supporting assembly (11);
two ends of the magnetic yoke (53) are respectively provided with magnetic steels (52) and wear-resisting plates (51) which are arranged from inside to outside, and the detection probe (13) is arranged on the magnetic yoke (53) and is positioned between the two magnetic steels (52);
the pair of magnetic steels (52) magnetize the pipeline to form an axial magnetic loop, and the detection probe (13) receives magnetic leakage signals at the defect part of the pipeline wall.
7. The intelligent magnetic leakage internal detection instrument suitable for various diameter pipelines according to claim 6, wherein the magnetic leakage joint support assembly (11) comprises a spring guide rod (58) and a magnetic leakage joint support arm (47);
One end of the magnetic leakage joint supporting arm (47) is rotatably arranged on the magnetic leakage joint front flange (10) through the magnetic leakage joint supporting base (43), and the other end of the magnetic leakage joint supporting arm is relatively rotatably and slidably arranged on the magnetic yoke (53) through the magnetic leakage joint base (54);
the spring guide rod (58) pulls the magnetic leakage joint supporting arm (47) to enable the magnetic circuit assembly to be matched with the pipe wall and attached to the pipe wall.
8. The intelligent magnetic leakage internal detection instrument suitable for the pipelines with various diameters according to claim 7, wherein the magnetic leakage joint base (54) is provided with a strip-shaped groove, one end of the magnetic leakage joint supporting arm (47) is provided with an eighth rotating shaft (49), and the eighth rotating shaft (49) rotates relatively and is arranged in the strip-shaped groove in a sliding manner.
9. The intelligent magnetic flux leakage internal detection instrument suitable for various diameter pipelines according to claim 7, wherein the magnetic flux leakage joint support assembly (11) further comprises a fourth rotating wheel (45) and a fifth rotating wheel (48);
The fourth rotating wheel (45) is rotatably arranged in the middle of the magnetic leakage joint supporting arm (47), and the fifth rotating wheel (48) is rotatably arranged 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) is respectively contacted with the inner wall of the pipeline.
10. The intelligent magnetic flux leakage inner detection instrument suitable for the pipelines with various diameters according to claim 9 is characterized in that the number of the sealing joint assemblies is three, and the sealing joint assemblies are sequentially a first sealing joint assembly, a second sealing joint assembly and a third sealing joint assembly from front to back, wherein the adjacent sealing joint assemblies are connected through flexible universal joints (5);
And a transmitter (16) is arranged on the magnetic leakage joint rear flange (17), and the transmitter (16) transmits electromagnetic signals for detecting and tracking in the pipeline.
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| CN115452938A (en) * | 2022-10-11 | 2022-12-09 | 国家石油天然气管网集团有限公司 | Inspection equipment for weld defects in pipelines |
| CN115856070B (en) * | 2022-10-12 | 2025-06-10 | 江苏恒达智通检测技术有限公司 | A magnetic flux leakage detection device with a self-cleaning structure and portable pressure-bearing equipment |
| CN115684336B (en) * | 2022-11-22 | 2025-07-11 | 江苏恒达智通检测技术有限公司 | A magnetic flux leakage detector and method for accurately judging mileage |
| CN115921453B (en) * | 2022-12-29 | 2024-12-03 | 国家石油天然气管网集团有限公司 | A diameter-changing pig for long-distance crude oil pipeline |
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| CN101685062A (en) * | 2008-09-28 | 2010-03-31 | 中国石油化工股份有限公司 | Pipeline reducing diameter detecting device |
| CN104989913A (en) * | 2015-05-18 | 2015-10-21 | 中海石油(中国)有限公司 | Submarine pipeline magnetic leakage internal detection device |
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| US7256576B2 (en) * | 2005-07-29 | 2007-08-14 | General Electric Company | ID-OD discrimination sensor |
| US10458822B2 (en) * | 2016-07-11 | 2019-10-29 | Entegra LLP | Dynamic spacer for a smart pipeline inspection gauge |
| CN111425767A (en) * | 2020-03-24 | 2020-07-17 | 智云安科技(北京)有限公司 | Pipeline magnetic leakage internal inspection device capable of actively reducing measurement and reducing movement |
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| CN101685062A (en) * | 2008-09-28 | 2010-03-31 | 中国石油化工股份有限公司 | Pipeline reducing diameter detecting device |
| CN104989913A (en) * | 2015-05-18 | 2015-10-21 | 中海石油(中国)有限公司 | Submarine pipeline magnetic leakage internal detection device |
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