CN215953460U - Inner wall defect detector for oil and gas pipeline - Google Patents

Abstract

The utility model discloses an inner wall defect detector for an oil and gas pipeline, which comprises a first cylinder, a third cylinder, a fourth cylinder and a plurality of numerical control boxes arranged on the outer surface of the first cylinder, wherein the outer surfaces of the third cylinder and the fourth cylinder are respectively provided with at least four magnetic stripes formed by closely arranging second magnetic steels along the axial direction, the upper surface of each second magnetic steel is densely distributed with second steel brushes, a detection strip formed by arranging a plurality of second probes along the circumferential direction is arranged between every two adjacent magnetic stripes, and a first fillet groove is formed in the acute angle formed between the lower bottom and the first side edge in four corners of a parallelogram elastic support. The utility model can effectively prevent the straight leather cup from deforming due to the interaction with the pipeline and pressing the straight leather cup onto the dish leather cup, thereby preventing the dish leather cup from deforming to influence the driving stability, further ensuring the moving stability of the device in the pipeline and improving the detection precision of the device on the pipeline.

Description

Inner wall defect detector for oil and gas pipeline

Technical Field

The utility model relates to an inner wall defect detector for an oil and gas pipeline, 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 an inner wall defect detector for an oil and gas pipeline, which can effectively prevent a straight leather cup and the pipeline from deforming due to interaction to press the straight leather cup and the pipeline on a magnetic leakage detection device, further prevent the deformation of the straight leather cup from influencing the driving stability, further ensure the moving stability of the device in the pipeline and further improve the detection precision of the device on the pipeline.

In order to achieve the purpose, the utility model adopts the technical scheme that: an inner wall defect detector for an oil and gas pipeline comprises a first cylinder, a third cylinder, a fourth cylinder and a plurality of numerical control boxes arranged on the outer surface of the first cylinder, wherein the first cylinder, the third cylinder and the fourth cylinder are connected through a chain;

the front end face and the rear end face of the third cylinder and the fourth cylinder are respectively connected with a front flange and a rear flange, each of the front flange and the rear flange is sleeved with a leather cup, the outer side of each leather cup is provided with a leather cup pressing plate connected with the front flange and the rear flange, the outer surfaces of the third cylinder and the fourth cylinder are respectively provided with at least four magnetic stripes formed by second magnetic steel in a close arrangement along the axial direction, the upper surface of each second magnetic steel is densely distributed with second steel brushes, and a detection strip formed by a plurality of second probes in a circumferential arrangement is arranged between the adjacent magnetic stripes;

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;

the first rear flange of the first barrel is connected with the front flange of the third barrel through the chain, the rear flange of the third barrel is connected with the front flange of the fourth barrel through the chain, and the rear flange of the fourth barrel is provided with a plurality of mileage wheels which are in contact connection with the inner wall of the pipeline;

the first front leather cup and the first rear leather cup respectively 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 arranged between the straight leather cup and the disc 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 second probe further comprises a parallelogram elastic support and a sensor arranged on the support, the lower surface of the elastic support is correspondingly arranged on the third barrel and the fourth barrel, an installation gap is formed in the upper surface of the elastic support, an insulating sleeve is coated on the outer side of 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 round groove is formed in each of four corners of the parallelogram elastic support from an acute angle formed between the lower bottom and the first side edge.

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

1. 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.

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

3. 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.

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

5. 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.

6. In the above scheme, the number of the magnetic strips on the third cylinder and the fourth cylinder is respectively 4.

7. In the above scheme, the third cylinder and the fourth cylinder are arranged in a staggered manner in the circumferential direction, so that a connecting line between the circumferential midpoint of any one detection strip on the third cylinder and the circumferential midpoint of one magnetic strip on the fourth cylinder is parallel to the axes of the third cylinder and the fourth cylinder.

8. In the above scheme, a plurality of second adapter boxes are respectively installed on the respective leather cup pressing plates of the third cylinder and the fourth cylinder, and the second adapter boxes are respectively and electrically connected with the respective second probes and the numerical control box.

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

1. the inner wall defect detector for the oil and gas pipeline can move in the pipeline with 15% of deformation, accurately detect the defects in the range of 360 degrees in the circumferential direction of the passing pipeline, effectively identify the defect positions, the defect properties and the like of the pipeline, and provide accurate data guidance for the maintenance of the pipeline.

2. According to the inner wall defect detector for the oil and gas pipeline, the probe structure is arranged, so that the upper surface of the probe and the inner wall of the pipeline to be tested can always keep interference, namely the probe and the inner wall of the pipeline are always kept in a tight fit state, and the detection precision of a sensor in a 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 inner wall defect detector for the oil and gas pipeline comprises a first front leather cup and a first rear leather cup, wherein the first front leather cup and the first rear leather cup respectively comprise a straight leather cup and a disc leather cup, the 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, the straight leather cup, the disc leather cup and the spacer are combined to have good supporting function, and can be matched with liquid or gas in the pipeline to provide enough driving force for the device so as to ensure that the device can keep balance and stable forward in the pipeline, thereby ensuring the accuracy of the device for measuring the inner diameter of the pipeline, and the setting of the spacer can effectively avoid the deformation generated by the interaction of 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 sectional view of the inner wall defect detector for oil and gas pipelines in the utility model;

FIG. 2 is a schematic structural diagram of a cup leather of the inner wall defect detector for the oil and gas pipeline;

FIG. 3 is a schematic structural view of a probe of the inner wall defect detector for the oil and gas pipeline;

FIG. 4 is a schematic view of a partial structure of the inner wall defect detector for an oil and gas pipeline according to the present invention;

FIG. 5 is a partial structural sectional view of the inner wall defect detector for an oil and gas pipeline according to the present invention;

FIG. 6 is a magnetic steel distribution diagram of the inner wall defect detector for oil and gas pipelines.

In the above drawings: 1. a first cylinder; 3. a numerical control box; 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; 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; 103. a leather cup spacer; 15. a mileage wheel; 1a, an elastic bracket; 3a, an insulating sleeve; 4a, a wear-resistant layer; 5a, a first fillet groove; 6a, a second fillet groove; 1b, a third cylinder; 2b, a fourth cylinder; 3b, a front flange; 4b, a rear flange; 5b, a leather cup; 6b, pressing a leather cup plate; 7b, second magnetic steel; 8b, a magnetic strip; 9b, a second steel brush; 10b, a second probe; 11b, a detection strip; 14b, a battery section; 15b and a second junction box.

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: an inner wall defect detector for an oil and gas pipeline comprises a first barrel 1, a third barrel 1b, a fourth barrel 2b and a plurality of numerical control boxes 3 arranged on the outer surface of the first barrel 1, wherein the first barrel 1, the third barrel 1b and the fourth barrel 2b are connected through a chain 6;

the front end face and the rear end face of the third cylinder body 1b and the fourth cylinder body 2b are respectively connected with a front flange 3b and a rear flange 4b, each of the front flange 3b and the rear flange 4b is sleeved with a leather cup 5b, a leather cup pressing plate 6b connected with the front flange 3b and the rear flange 4b is arranged outside the leather cup 5b, the outer surfaces of the third cylinder body 1b and the fourth cylinder body 2b are respectively provided with at least four magnetic stripes 8b formed by second magnetic steel 7b in close arrangement along the axial direction, the upper surface of each second magnetic steel 7b is densely distributed with second steel brushes 9b, detection strips formed by a plurality of second probes 10b in close arrangement along the circumferential direction are arranged between the adjacent magnetic stripes 8b, a magnetic field is generated by the magnetic steel, and magnetic conduction is realized by the steel brushes;

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;

the first rear flange 8 of the first cylinder 1 is connected with the front flange 3b of the third cylinder 1b, the rear flange 4b of the third cylinder 1b is connected with the front flange 3b of the fourth cylinder 2b through the chain 6, the rear flange 4b of the fourth cylinder 2b 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 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 pressing plate 1001 is embedded in the disc cup 102 of the first rear cup 10 and is in pressing contact with the bottom of the disc cup 102;

the second probe 10b 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 correspondingly arranged on the third cylinder 1b and the fourth cylinder 2b, an installation gap is formed in the upper surface of the elastic support 1a, an insulating sleeve 3a wraps 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 circular angle groove 5a is formed in the acute angle formed between the lower bottom and the first side edge of the parallelogram-shaped elastic support 1 a.

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;

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 base of one isosceles trapezoid near the bottom 921, 1021 of the dish cup 92, 102 is smaller than the acute angle formed between the base of the other isosceles trapezoid away from the bottom 921, 1021 of the dish cup 92, 102.

Example 2: an inner wall defect detector for an oil and gas pipeline comprises a first barrel 1, a third barrel 1b, a fourth barrel 2b and a plurality of numerical control boxes 3 arranged on the outer surface of the first barrel 1, wherein the first barrel 1, the third barrel 1b and the fourth barrel 2b are connected through a chain 6;

the front end face and the rear end face of the third cylinder body 1b and the fourth cylinder body 2b are respectively connected with a front flange 3b and a rear flange 4b, each of the front flange 3b and the rear flange 4b is sleeved with a leather cup 5b, a leather cup pressing plate 6b connected with the front flange 3b and the rear flange 4b is arranged outside the leather cup 5b, the outer surfaces of the third cylinder body 1b and the fourth cylinder body 2b are respectively provided with at least four magnetic stripes 8b formed by second magnetic steel 7b in close arrangement along the axial direction, the upper surface of each second magnetic steel 7b is densely distributed with second steel brushes 9b, detection strips formed by a plurality of second probes 10b in close arrangement along the circumferential direction are arranged between the adjacent magnetic stripes 8b, a magnetic field is generated by the magnetic steel, and magnetic conduction is realized by the steel brushes;

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;

the first rear flange 8 of the first cylinder 1 is connected with the front flange 3b of the third cylinder 1b, the rear flange 4b of the third cylinder 1b is connected with the front flange 3b of the fourth cylinder 2b through the chain 6, the rear flange 4b of the fourth cylinder 2b 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 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 pressing plate 1001 is embedded in the disc cup 102 of the first rear cup 10 and is in pressing contact with the bottom of the disc cup 102;

the second probe 10b 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 correspondingly arranged on the third cylinder 1b and the fourth cylinder 2b, an installation gap is formed in the upper surface of the elastic support 1a, an insulating sleeve 3a wraps 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 circular angle groove 5a is formed in the acute angle formed between the lower bottom and the first side edge of the parallelogram-shaped elastic support 1 a.

The number of the magnetic strips 8b on the third cylinder 1b and the fourth cylinder 2b is respectively 4; the third cylinder body 1b and the fourth cylinder body 2b are arranged in a staggered mode in the circumferential direction, so that a connecting line of the circumferential middle point of any detection strip on the third cylinder body 1b and the circumferential middle point of one magnetic strip 8b on the fourth cylinder body 2b is parallel to the axial lines of the third cylinder body 1b and the fourth cylinder body 2b, second magnetic steel and second probes are uniformly distributed in the circumferential direction of 360 degrees, and 360-degree omnibearing detection on the pipe wall is achieved;

a plurality of second adapter boxes 15b are respectively arranged on the leather cup pressing plates 6b of the third cylinder 1b and the fourth cylinder 2b, and the second adapter boxes 15b are respectively and electrically connected with the second probes 10b and the numerical control box 3; the wear-resistant layer 4a is a chromium oxide ceramic wafer; the first cylinder 1, the third cylinder 1b and the fourth cylinder 2b are all internally provided with a battery section 14 b;

a circular ring groove is formed in each of the first front flange 7 and the first rear flange 8 of the first cylinder 1, the front flange 3b and the rear flange 4b of the third cylinder 1b and the fourth cylinder 2b, and a sealing ring is embedded in the circular ring groove, so that the sealing performance of the cylinder with a built-in battery is further ensured, and the potential safety hazards such as short circuit and explosion caused by the fact that inflammable oil gas in a pipeline enters the cylinder and contacts the battery are avoided; the first front leather cup 9, the first rear leather cup 10 and the leather cup 5b are all polyurethane leather cups.

By adopting the inner wall defect detector for the oil and gas pipeline, the inner wall defect detector can move in the pipeline with 15% of deformation, accurately detect the defects in the circumferential direction of the passing pipeline within the range of 360 degrees, 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, the arrangement of the fillet groove enables the elastic support to have a buffer area when being extruded in the pipeline, the situations that the support is locally fractured or cannot rebound due to the fact that the stress generated by the elastic support is too large and too concentrated when being rapidly extruded is avoided, the tight fit between the probe and the inner wall of the pipeline can be further guaranteed after the equipment is used for a long time, and the detection precision is guaranteed;

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 (9)

1. The utility model provides an inner wall defect detector for oil gas pipeline which characterized in that: the device comprises a first cylinder (1), a third cylinder (1 b), a fourth cylinder (2 b) and a plurality of numerical control boxes (3) arranged on the outer surface of the first cylinder (1), wherein the first cylinder (1), the third cylinder (1 b) and the fourth cylinder (2 b) are connected through a chain (6);

the front end face and the rear end face of the third cylinder body (1 b) and the rear end face of the fourth cylinder body (2 b) are respectively connected with a front flange (3 b) and a rear flange (4 b), each front flange (3 b) and each rear flange (4 b) are sleeved with a leather cup (5 b), the outer side of each leather cup (5 b) is provided with a leather cup pressing plate (6 b) connected with the front flange (3 b) and the rear flange (4 b), the outer surfaces of the third cylinder body (1 b) and the fourth cylinder body (2 b) are respectively provided with at least four magnetic stripes (8 b) formed by closely arranging second magnetic steels (7 b) along the axial direction, the upper surface of each second magnetic steel (7 b) is densely distributed with second steel brushes (9 b), and detection strips formed by arranging a plurality of second probes (10 b) along the circumferential direction are arranged between the adjacent magnetic stripes (8 b);

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;

the first rear flange (8) of the first barrel (1) is connected with the front flange (3 b) of the third barrel (1 b), the rear flange (4 b) of the third barrel (1 b) is connected with the front flange (3 b) of the fourth barrel (2 b) through the chain (6), the rear flange (4 b) of the fourth barrel (2 b) 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 front leather cup (9) and the first rear leather cup (10) further comprise straight leather cups (91, 101) and disc leather cups (92, 102), the opening parts of the disc leather cups (92, 102) are positioned on one sides opposite to the straight leather cups (91, 101), leather cup spacers (93, 103) are further arranged between the straight leather cups (91, 101) and the disc leather cups (92, 102), and two side surfaces of the leather cup spacers (93, 103) are respectively in contact connection with the straight leather cups (91, 101) and the disc leather cups (92, 102);

the second probe (10 b) further comprises a parallelogram-shaped elastic support (1 a) and a sensor arranged on the support (1 a), the lower surface of the elastic support (1 a) is correspondingly arranged on the third cylinder (1 b) and the fourth cylinder (2 b), an installation gap is arranged on the upper surface of the elastic support (1 a), the outer side of the sensor is wrapped with an insulating sleeve (3 a), the insulating sleeve (3 a) is embedded into the installation gap and fixedly connected with the upper surface of the elastic support (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, and the four corners of the parallelogram-shaped elastic support (1 a), a first round angle groove (5 a) is arranged at an acute angle formed between the lower bottom and the first side edge.

2. The inner wall defect detector for an oil and gas pipeline according to claim 1, characterized in that: 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.

3. The inner wall defect detector for an oil and gas pipeline according to claim 1, characterized in that: the sensor comprises a Hall sensor and an eddy current sensor.

4. The inner wall defect detector for an oil and gas pipeline according to claim 1, characterized in that: 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.

5. The inner wall defect detector for an oil and gas pipeline according to claim 4, characterized in that: the shortest base line of the two isosceles trapezoids corresponds to the bottom (921, 1021) of the dish leather bowl (92, 102).

6. The inner wall defect detector for an oil and gas pipeline according to claim 5, characterized in that: 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.

7. The inner wall defect detector for an oil and gas pipeline according to claim 1, characterized in that: the number of the magnetic strips (8 b) on the third cylinder (1 b) and the fourth cylinder (2 b) is respectively 4.

8. The inner wall defect detector for an oil and gas pipeline according to claim 1, characterized in that: the third cylinder body (1 b) and the fourth cylinder body (2 b) are arranged in a staggered mode in the circumferential direction, so that a connecting line of the circumferential midpoint of any detection strip on the third cylinder body (1 b) and the circumferential midpoint of one magnetic strip (8 b) on the fourth cylinder body (2 b) is parallel to the axial lines of the third cylinder body (1 b) and the fourth cylinder body (2 b).

9. The inner wall defect detector for an oil and gas pipeline according to claim 1, characterized in that: a plurality of second adapter boxes (15 b) are respectively arranged on the leather cup pressing plates (6 b) of the third cylinder body (1 b) and the fourth cylinder body (2 b), and the second adapter boxes (15 b) are respectively and electrically connected with the second probes (10 b) and the numerical control box (3).

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