CN215953465U

CN215953465U - Pipeline defect detection device based on magnetic leakage method

Info

Publication number: CN215953465U
Application number: CN202020320137.6U
Authority: CN
Inventors: 杨玉
Original assignee: Dtaic Inspection Equipment Suzhou Co ltd
Current assignee: Dtaic Inspection Equipment Suzhou Co ltd
Priority date: 2020-03-16
Filing date: 2020-03-16
Publication date: 2022-03-04
Anticipated expiration: 2030-03-16

Abstract

The utility model discloses a pipeline defect detection device based on a magnetic flux leakage method, which comprises a first barrel, a second barrel, a plurality of numerical control boxes arranged on the outer surface of the first barrel, a plurality of first probes arranged on the outer surface of the second barrel and a plurality of first magnetic steels, wherein the first barrel and the second barrel are connected through a chain, the plurality of numerical control boxes are arranged at equal intervals along the circumferential direction of the first barrel, the plurality of first probes are arranged at equal intervals along the circumferential direction of the second barrel, the first probes are electrically connected with the numerical control boxes, the first front leather cup and the first rear leather cup further comprise a straight leather cup and a disc leather cup, the opening part of the disc leather cup is positioned on one side opposite to the straight leather cup, a leather cup spacer is further arranged between the straight leather cup and the leather cup, and two side surfaces of the leather cup spacer are respectively in contact connection with the straight leather cup and the disc leather cup. The utility model ensures that the equipment can still ensure the close fit of the probe and the inner wall of the pipeline after long-time use, and ensures the detection precision.

Description

Pipeline defect detection device based on magnetic leakage method

Technical Field

The utility model relates to a pipeline defect detection device based on a magnetic flux leakage method, and belongs to the technical field of pipeline detection.

Background

The pipeline is an important facility for transporting liquid and gas, and is widely applied to water supply, water drainage, heat supply, gas supply, long-distance petroleum and natural gas transportation, agricultural irrigation, hydraulic engineering and various industrial devices, the pipeline is easy to generate different degrees of damage deformation after being used for a long time, the efficiency of oil and gas transportation is reduced, the loss is increased due to leakage generated in the transportation process, and meanwhile, serious potential safety hazards are caused, so that the pipeline is necessary to be regularly detected, the integrity and the peripheral safety of the pipeline are guaranteed, the operation management risk of the pipeline is reduced, and the occurrence of operation production accidents is reduced.

In the prior art, a magnetic leakage detection method is often adopted to detect the characteristics, the length and the like of the inner wall and the outer wall of a pipeline and the pipeline, when the magnetic leakage detection method utilizes a ferromagnetic steel pipe to be fully magnetized, magnetic lines of force in the pipe wall are blocked by defects on the surface or the position close to the surface of the ferromagnetic steel pipe, the magnetic lines of force at the defects are distorted, and a part of the magnetic lines of force leaks out of the inner surface and the outer surface of the ferromagnetic steel pipe to form a magnetic leakage field for detection.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a pipeline defect detection device based on a magnetic leakage method, which can ensure that a probe can be still tightly attached to the inner wall of a pipeline after a device is ensured to be used for a long time by the magnetic leakage detection device, so that the detection precision is ensured.

In order to achieve the purpose, the utility model adopts the technical scheme that: a pipeline defect detection device based on a magnetic flux leakage method comprises a first barrel, a second barrel, a plurality of numerical control boxes arranged on the outer surface of the first barrel, a plurality of first probes arranged on the outer surface of the second barrel and a plurality of first magnetic steels, wherein the first barrel and the second barrel are connected through a chain;

a first front flange and a first rear flange are respectively connected to the front end face and the rear end face of the first cylinder, a first front leather cup is sleeved on the first front flange, a first rear leather cup is sleeved on the first rear flange, and the first front leather cup and the first rear leather cup are in interference fit with the inner wall of the pipeline in the circumferential direction;

a second front flange and a second rear flange are respectively connected to the front end face and the rear end face of the second cylinder, a second front leather cup is sleeved on the second front flange, and a second rear leather cup is sleeved on the second rear flange;

the first rear flange is connected with the second front flange through the chain, a plurality of mileage wheels are mounted on the second rear flange, and the mileage wheels are in contact connection with the inner wall of the pipeline;

the first probe further comprises a parallelogram elastic support and a sensor arranged on the support, the lower surface of the elastic support is arranged on the second cylinder, an installation gap is formed in the upper surface of the elastic support, an insulating sleeve is wrapped outside the sensor and embedded into the installation gap and fixedly connected with the upper surface of the elastic support, a wear-resistant layer is connected to the upper surface of the insulating sleeve, the upper surface of the wear-resistant layer is slightly higher than the upper surface of the elastic support, so that the upper surface of the wear-resistant layer is tightly attached to the inner wall of the pipeline, and a first fillet groove is formed in each of four corners of the parallelogram elastic support at an acute angle formed between the lower bottom and the first side edge;

the leather cup is characterized in that the first front leather cup and the first rear leather cup further comprise a straight leather cup and a dish leather cup, the opening part of the dish leather cup is located on one side of the straight leather cup in a back-to-back mode, a leather cup isolation pad is further arranged between the straight leather cup and the dish leather cup, and two side surfaces of the leather cup isolation pad are respectively in contact connection with the straight leather cup and the dish leather cup.

The further improved scheme in the technical scheme is as follows:

1. in the above scheme, the dish leather cup comprises a circular ring-shaped bottom and an opening part, the cross section of the dish leather cup is hexagonal, the hexagon is formed by connecting two isosceles trapezoids, and the lower bottom of one isosceles trapezoid is the upper bottom of the other isosceles trapezoid.

2. In the above scheme, the shortest bottom side of the two isosceles trapezoids corresponds to the bottom of the dish leather cup.

3. In the above scheme, an acute angle formed between the waist of one isosceles trapezoid close to the bottom of the dish leather cup and the bottom edge of the isosceles trapezoid is smaller than an acute angle formed between the waist of the other isosceles trapezoid far away from the bottom of the dish leather cup and the bottom edge of the isosceles trapezoid.

4. In the scheme, the maximum diameter of the opening part of the disk leather cup is larger than that of the straight leather cup.

5. In the scheme, the diameter of the leather cup spacer is smaller than that of the bottom of the leather cup of the dish.

6. In the above scheme, the inner surface of the first side edge is further provided with a second fillet groove, and the second fillet groove is close to an obtuse angle formed between the upper bottom and the first side edge.

7. In the above scheme, the sensor includes a hall sensor and an eddy current sensor.

8. In the above scheme, batteries are installed in the first cylinder and the second cylinder.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

1. the pipeline defect detection device based on the magnetic flux leakage method can move in a pipeline with 15% of deformation, accurately detect the axial defects in the passing pipeline, effectively identify the defect positions, defect properties and the like of the pipeline, and provide accurate data guidance for the maintenance of the pipeline.

2. According to the pipeline defect detection device based on the magnetic flux leakage method, due to the arrangement of the probe structure, the upper surface of the probe can be always in interference with the inner wall of the pipeline to be tested, namely, the probe and the inner wall of the pipeline are always in a tight fit state, so that the detection precision of the sensor in the sleeve head is ensured; further, in four angles of its parallelogram elastic support, acute angle department by forming between going to the bottom and the first side opens there is a first fillet groove, the setting in fillet groove, make elastic support when being extrudeed in the pipeline, a buffer has, avoid elastic support when being extruded by sharply, produced stress is too big, too concentrate and lead to support local fracture or surpass yield strength and make the unable circumstances such as kick-back of support, further guarantee equipment still can guarantee the inseparable laminating of probe and pipe inner wall after long-time the use, guarantee to detect the precision.

3. The utility model relates to a pipeline defect detection device based on a magnetic leakage method, wherein a first front leather cup and a first rear leather cup respectively further comprise a straight leather cup and a disc leather cup, an opening part of the disc leather cup is positioned at one side opposite to the straight leather cup, a leather cup spacer is also arranged between the straight leather cup and the disc leather cup, two side surfaces of the leather cup spacer are respectively in contact connection with the straight leather cup and the disc leather cup, through the combined arrangement of the straight leather cup, the disc leather cup and the spacer, the device has good supporting effect, can be matched with liquid or gas in a pipeline to provide enough driving force for the device so as to ensure that the device can keep balance and stability forward in the pipeline, thereby ensuring the accuracy of the device for measuring the inner diameter of the pipeline, and the arrangement of the spacer can effectively avoid the deformation generated by the interaction between the straight leather cup and the pipeline and pressing the disc leather cup to further avoid the deformation of the disc leather cup to influence the driving stability, the stability of the device moving in the pipeline is further ensured, and the precision of the device for detecting the pipeline is improved.

Drawings

FIG. 1 is a schematic structural diagram of a pipeline defect detection device based on a magnetic flux leakage method;

FIG. 2 is a cross-sectional view of a pipeline defect detecting device based on a magnetic flux leakage method according to the present invention;

FIG. 3 is a partial structural cross-sectional view of the pipeline defect detecting device based on the magnetic flux leakage method of the present invention;

FIG. 4 is a schematic structural diagram of a cup leather of the pipeline defect detection device based on the magnetic flux leakage method;

FIG. 5 is a schematic structural view of a probe of the pipeline defect detection device based on the magnetic flux leakage method.

In the above drawings: 1. a first cylinder; 2. a second cylinder; 3. a numerical control box; 4. a first probe; 5. a first magnetic steel; 6. a chain; 7. a first front flange; 8. a first rear flange; 9. a first front leather cup; 91. a straight leather cup; 92. a dish leather bowl; 921. a bottom; 922. an opening part; 93. a leather cup spacer; 103. a leather cup spacer; 901. a first front platen; 902. a first front bolt; 1001. a first rear platen; 1002. a first rear bolt; 10. a first rear leather cup; 101. a straight leather cup; 102. a dish leather bowl; 1021. a bottom; 1022. an opening part; 11. a second front flange; 12. a second rear flange; 13. a second front leather cup; 14. a second rear leather cup; 15. a mileage wheel; 16. a magnetic ring; 1a, an elastic bracket; 3a, an insulating sleeve; 4a, a wear-resistant layer; 5a, a first fillet groove; 6a and a second fillet groove.

Detailed Description

In the description of this patent, it is noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The meaning of the above terms in this patent may be specifically understood by those of ordinary skill in the art.

Example 1: a pipeline defect detection device based on a magnetic flux leakage method comprises a first barrel body 1, a second barrel body 2, a plurality of numerical control boxes 3 arranged on the outer surface of the first barrel body 1, a plurality of first probes 4 arranged on the outer surface of the second barrel body 2 and a plurality of first magnetic steel 5, wherein the first barrel body 1 is connected with the second barrel body 2 through a chain 6, the plurality of numerical control boxes 3 are arranged at equal intervals along the circumferential direction of the first barrel body 1, the plurality of first probes 4 are arranged at equal intervals along the circumferential direction of the second barrel body 2, the first probes 4 are electrically connected with the numerical control boxes 3, the plurality of first magnetic steel 5 are averagely divided into two groups, each group of first magnetic steel 5 is respectively and continuously arranged along the circumferential direction of the second barrel body 2, steel brushes are uniformly and densely distributed on each first magnetic steel 5, so as to form two magnetic rings 16, the two magnetic rings 16 are respectively positioned at two sides of a probe ring formed by the first probes 4 arranged along the circumferential direction of the second barrel body 2, a magnetic field is generated by the magnetic block, and magnetic conduction is realized by the steel brush;

a first front flange 7 and a first rear flange 8 are respectively connected to the front end face and the rear end face of the first cylinder 1, a first front leather cup 9 is sleeved on the first front flange 7, a first rear leather cup 10 is sleeved on the first rear flange 8, and the first front leather cup 9 and the first rear leather cup 10 are in interference fit with the inner wall of the pipeline in the circumferential direction;

the first front leather cup 9 is fixedly connected with the first front flange 7 through a first front pressing plate 901, the first rear leather cup 10 is fixedly connected with the first rear flange 8 through a first rear pressing plate 1001, a plurality of first front bolts 902 sequentially penetrate through the first front pressing plate 901, the first front leather cup 9 and the first front flange 7 and are fixedly connected with the front end face of the first cylinder 1, and a plurality of first rear bolts 1002 sequentially penetrate through the first rear pressing plate, the first rear leather cup 1001 10 and the first rear flange 8 and are fixedly connected with the rear end face of the first cylinder 1;

a second front flange 11 and a second rear flange 12 are respectively connected to the front end face and the rear end face of the second cylinder 2, a second front leather cup 13 is sleeved on the second front flange 11, and a second rear leather cup 14 is sleeved on the second rear flange 12;

the first rear flange 8 is connected with the second front flange 11 through the chain 6, the second rear flange 12 is provided with a plurality of mileage wheels 15, and the mileage wheels 15 are in contact connection with the inner wall of the pipeline;

the first probe 4 further comprises a parallelogram-shaped elastic support 1a and a sensor arranged on the support 1a, the lower surface of the elastic support 1a is arranged on the second cylinder 2, an installation gap is formed in the upper surface of the elastic support 1a, an insulating sleeve 3a covers the outer side of the sensor, the insulating sleeve 3a is embedded into the installation gap and fixedly connected with the upper surface of the elastic support 1a, a wear-resistant layer 4a is connected to the upper surface of the insulating sleeve 3a, the upper surface of the wear-resistant layer 4a is slightly higher than the upper surface of the elastic support 1a, so that the upper surface of the wear-resistant layer 4a is tightly attached to the inner wall of the pipeline, and a first round-angle groove 5a is formed in each of four corners of the parallelogram-shaped elastic support 1a at an acute angle formed between the upper surface of the parallelogram-shaped elastic support and the first side edge of the lower bottom;

the first front leather cup 9 and the first rear leather cup 10 further comprise straight leather cups 91 and 101 and disc leather cups 92 and 102, the opening parts of the disc leather cups 92 and 102 are located on the side opposite to the straight leather cups 91 and 101, a leather cup spacer 93 and 103 is further arranged between the straight leather cups 91 and 101 and the disc leather cups 92 and 102, two side surfaces of the leather cup spacer 93 and 103 are respectively in contact connection with the straight leather cups 91 and 101 and the disc leather cups 92 and 102, the circumferential surface of the straight leather cups 91 and 101 is in interference fit with the inner wall of the pipeline, the circumferential surface of the opening parts of the disc leather cups 92 and 102 is in interference fit with the inner wall of the pipeline, the straight leather cups 91 and 101 are mainly used for supporting the whole device, the disc leather cups 92 and 102 have larger contact areas and are used for being matched with gas or liquid in the pipeline, the driving device is integrally moved, the first front pressure plate 901 is in extrusion contact with the straight leather cup 91 of the first front leather cup 9, the first rear platen 1001 is embedded in the bowl 102 of the first rear cup 10 and is in pressing contact with the bottom of the bowl 102.

The disk leather cups 92 and 102 comprise circular ring-shaped bottoms 921 and 1021 and opening parts 922 and 1022, the cross sections of the disk leather cups 92 and 102 are hexagons, the hexagons are formed by connecting two isosceles trapezoids, and the lower bottom of one isosceles trapezoid is the upper bottom of the other isosceles trapezoid; the shortest bottom edge of the two isosceles trapezoids corresponds to the bottoms 921, 1021 of the dish leather cups 92, 102;

the acute angle formed between the waist of one isosceles trapezoid close to the bottom 921, 1021 of the

dish leather

92, 102 and the bottom edge thereof is smaller than the acute angle formed between the waist of the other isosceles trapezoid far from the bottom 921, 1021 of the

dish leather

92, 102 and the bottom edge thereof; the maximum diameter of the opening parts 922 and 1022 of the disk cups 92 and 102 is larger than the diameter of the

straight cups

91 and 101; the diameters of the

cup spacers

93, 103 are smaller than the diameters of the bottoms 921, 1021 of the cup cups 92, 102.

Example 2: a pipeline defect detection device based on a magnetic flux leakage method comprises a first barrel body 1, a second barrel body 2, a plurality of numerical control boxes 3 arranged on the outer surface of the first barrel body 1, a plurality of first probes 4 arranged on the outer surface of the second barrel body 2 and a plurality of first magnetic steel 5, wherein the first barrel body 1 is connected with the second barrel body 2 through a chain 6, the plurality of numerical control boxes 3 are arranged at equal intervals along the circumferential direction of the first barrel body 1, the plurality of first probes 4 are arranged at equal intervals along the circumferential direction of the second barrel body 2, the first probes 4 are electrically connected with the numerical control boxes 3, the plurality of first magnetic steel 5 are averagely divided into two groups, each group of first magnetic steel 5 is respectively and continuously arranged along the circumferential direction of the second barrel body 2, steel brushes are uniformly and densely distributed on each first magnetic steel 5, so as to form two magnetic rings 16, the two magnetic rings 16 are respectively positioned at two sides of a probe ring formed by the first probes 4 arranged along the circumferential direction of the second barrel body 2, a magnetic field is generated by the magnetic block, and magnetic conduction is realized by the steel brush;

The inner surface of the first side is also provided with a second fillet groove 6a, and the second fillet groove 6a is close to an obtuse angle formed between the upper bottom and the first side; the sensor comprises a Hall sensor and an eddy current sensor, wherein the Hall sensor is used for sensing magnetic fields in three directions, and the eddy current sensor is used for monitoring whether the defects of the pipeline are positioned inside or outside the pipeline; batteries are arranged in the first cylinder 1 and the second cylinder 2.

By adopting the pipeline defect detection device based on the magnetic flux leakage method, the pipeline defect detection device can move in a pipeline with 15% of deformation, accurately detect the axial defects in the passing pipeline, effectively identify the defect positions, defect properties and the like of the pipeline, and provide accurate data guidance for the maintenance of the pipeline;

in addition, the arrangement of the probe structure can ensure that the upper surface of the probe always keeps interference with the inner wall of the pipeline to be tested, namely the probe always keeps a close fit state with the inner wall of the pipeline, thereby ensuring the detection precision of the sensor in the sleeve head;

furthermore, due to the arrangement of the fillet groove, the elastic support is provided with a buffer area when being extruded in the pipeline, the situations that the elastic support cannot rebound due to local fracture or over yield strength caused by overlarge and over-concentrated stress generated when being rapidly extruded are avoided, the close fit of the probe and the inner wall of the pipeline can be further ensured after the equipment is used for a long time, and the detection precision is ensured;

in addition, through straight leather cup, the combination setting of dish leather cup and dottle pin, both had good supporting role, can cooperate liquid or gas in the pipeline again, provide enough big drive power for the device, can keep balanced stable forward in the pipeline with the assurance device, thereby guarantee the device to pipeline internal diameter measuring's precision, and the setting of dottle pin, can effectively avoid straight leather cup and pipeline interact to produce and warp and press the dish leather cup, and then avoid the dish leather cup to take place to warp and influence driven stability, the stability of device removal in the pipeline has further been guaranteed, thereby improve the precision of device to the detection of pipeline.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a pipeline defect detection device based on magnetic leakage method which characterized in that: the magnetic control device comprises a first barrel body (1), a second barrel body (2), a plurality of numerical control boxes (3) arranged on the outer surface of the first barrel body (1), a plurality of first probes (4) and a plurality of first magnetic steels (5) arranged on the outer surface of the second barrel body (2), wherein the first barrel body (1) is connected with the second barrel body (2) through a chain (6), the plurality of numerical control boxes (3) are arranged at equal intervals along the circumferential direction of the first barrel body (1), the plurality of first probes (4) are arranged at equal intervals along the circumferential direction of the second barrel body (2), the first probes (4) are electrically connected with the numerical control boxes (3), the plurality of first magnetic steels (5) are averagely divided into two groups, each group of first magnetic steels (5) are respectively arranged continuously along the circumferential direction of the second barrel body (2), and steel brushes are uniformly and densely distributed on each first magnetic steel (5) to form two magnetic rings (16), the two magnetic rings (16) are respectively positioned at two sides of a probe ring formed by the first probe (4) arranged along the circumferential direction of the second cylinder (2);

a first front flange (7) and a first rear flange (8) are respectively connected to the front end face and the rear end face of the first barrel (1), a first front leather cup (9) is sleeved on the first front flange (7), a first rear leather cup (10) is sleeved on the first rear flange (8), and the first front leather cup (9) and the first rear leather cup (10) are in interference fit with the inner wall of the pipeline in the circumferential direction;

a second front flange (11) and a second rear flange (12) are respectively connected to the front end face and the rear end face of the second barrel (2), a second front leather cup (13) is sleeved on the second front flange (11), and a second rear leather cup (14) is sleeved on the second rear flange (12);

the first rear flange (8) is connected with the second front flange (11) through the chain (6), the second rear flange (12) is provided with a plurality of mileage wheels (15), and the mileage wheels (15) are in contact connection with the inner wall of the pipeline;

the first probe (4) further comprises a parallelogram-shaped elastic bracket (1 a) and a sensor arranged on the bracket (1 a), the lower surface of the elastic support (1 a) is arranged on the second cylinder body (2), the upper surface of the elastic support (1 a) is provided with an installation gap, the outer side of the sensor is coated with an insulating sleeve (3 a), the insulating sleeve (3 a) is embedded into the mounting notch and fixedly connected with the upper surface of the elastic bracket (1 a), the upper surface of the insulating sleeve (3 a) is connected with a wear-resistant layer (4 a), the upper surface of the wear-resistant layer (4 a) is slightly higher than the upper surface of the elastic support (1 a), so that the upper surface of the wear-resistant layer (4 a) is tightly attached to the inner wall of the pipeline, in the four corners of the parallelogram elastic support (1 a), a first round angle groove (5 a) is formed at an acute angle formed between the lower bottom and the first side edge;

first front leather cup (9), first back leather cup (10) all further include straight leather cup (91, 101) and dish leather cup (92, 102), the opening of dish leather cup (92, 102) is located one side of keeping away from straight leather cup (91, 101), still have a leather cup shock insulator (93, 103) between straight leather cup (91, 101) and dish leather cup (92, 102), and two side surfaces of this leather cup shock insulator (93, 103) are connected with straight leather cup (91, 101), dish leather cup (92, 102) contact respectively.

2. The pipeline defect detection device based on the magnetic leakage method as claimed in claim 1, wherein: the dish leather cups (92, 102) comprise circular ring-shaped bottoms (921, 1021) and opening parts (922, 1022), the cross sections of the dish leather cups (92, 102) are hexagonal, the hexagonal is formed by connecting two isosceles trapezoids, and the lower bottom of one isosceles trapezoid is the upper bottom of the other isosceles trapezoid.

3. The pipeline defect detection device based on the magnetic leakage method as claimed in claim 2, wherein: the shortest base line of the two isosceles trapezoids corresponds to the bottom (921, 1021) of the dish leather bowl (92, 102).

4. The pipeline defect detection device based on the magnetic leakage method as claimed in claim 3, wherein: the acute angle formed between the waist of one isosceles trapezoid close to the bottom (921, 1021) of the dish leather (92, 102) and the bottom edge thereof is smaller than the acute angle formed between the waist of the other isosceles trapezoid far from the bottom (921, 1021) of the dish leather (92, 102) and the bottom edge thereof.

5. The pipeline defect detection device based on the magnetic leakage method as claimed in claim 2, wherein: the maximum diameter of the opening (922, 1022) of the cup leather (92, 102) is larger than that of the straight cup leather (91, 101).

6. The pipeline defect detection device based on the magnetic leakage method as claimed in claim 2, wherein: the diameter of the leather cup spacers (93, 103) is smaller than the diameter of the bottoms (921, 1021) of the leather cups (92, 102).

7. The pipeline defect detection device based on the magnetic leakage method as claimed in claim 1, wherein: the inner surface of the first side edge is also provided with a second fillet groove (6 a), and the second fillet groove (6 a) is close to an obtuse angle formed between the upper bottom and the first side edge.

8. The pipeline defect detection device based on the magnetic leakage method as claimed in claim 1, wherein: the sensor comprises a Hall sensor and an eddy current sensor.

9. The pipeline defect detection device based on the magnetic leakage method as claimed in claim 1, wherein: batteries are arranged in the first cylinder (1) and the second cylinder (2).