Non-excavation weak magnetic detection device for oil and gas pipeline

Abstract

The invention relates to the technical field of pipeline weak magnetic detection, in particular to an oil and gas pipeline non-excavation weak magnetic detection device which comprises a rail driving mechanism and a weeding mechanism, and the rail driving mechanism comprises a rail robot and a rail assembly; a plurality of groups of track assemblies are spliced with one another to form a complete track structure; the track assembly comprises a support block and a track framework. Clamping grooves are formed in the two bracket blocks; the two rail frameworks are connected to the inner sides of the clamping grooves. Trundles on the track robot are matched with the track framework; the weeding mechanism comprises a plate a, a magnetic field shielding cover, a rotating ring, a motor, a cylinder and a blade; a rotating ring is rotationally arranged on the plate a; the magnetic field shielding cover is connected with the rotating ring; the cylinder body is rotationally arranged on the plate a; the blade is arranged on the outer surface of the barrel; the motor is arranged on the plate a and is in transmission connection with the barrel and the rotating ring. The use flexibility of the track structure is enhanced, and meanwhile it is avoided that grass is blown by wind to interfere with the stability of magnetic field signals.

Description

Technical Field

[0001] This invention relates to the field of pipeline weak magnetic field detection technology, specifically to a trenchless weak magnetic field detection device for oil and gas pipelines. Background Technology

[0002] Trenchless weak magnetic field testing is a non-destructive testing technique used for underground pipeline inspection, primarily for assessing pipeline corrosion, defects, and wall thickness variations.

[0003] Chinese patent CN213361924U discloses a weak magnetic field precision measurement device for hidden danger points of directly buried pipelines. The device uses a track inspection vehicle with a non-ferromagnetic structure to perform track-type weak magnetic field precision measurement at the detected hidden danger points of directly buried pipelines. This can effectively eliminate interference such as vibration in the axial and tangential directions and collect more accurate magnetic field information, which can then be used for the calculation of the remaining wall thickness.

[0004] However, the existing technology has the following drawbacks: there are often grasses at the pipeline laying points, and during the weak magnetic detection process, the magnetic sensor needs to be close to or near the pipeline surface. If the grass is too dense, it may cause poor contact between the magnetic sensor and the ground, reducing the signal quality. In addition, the grass may contain ferromagnetic impurities (such as iron wires and metal fragments), or mechanical vibration caused by wind, which may interfere with the stability of the magnetic field signal. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing a trenchless weak magnetic detection device for oil and gas pipelines.

[0006] The technical solution of the present invention: a trenchless weak magnetic field detection device for oil and gas pipelines, comprising:

[0007] The track drive mechanism includes a track robot, track components, bolt a, and a nut; multiple track components are provided and spliced ​​together to form a complete track structure; the track component includes a support block and a track frame; there are two support blocks with slots on them; there are two track frames connected to the inside of the slots; the casters on the track robot are adapted to the track frame; through holes are provided on the support blocks between adjacent track components; bolt a passes through the through holes and cooperates with the nut to connect the support blocks;

[0008] A weeding mechanism includes plate a, a magnetic field shield, a rotating ring, a motor, a cylinder, blades, an electromagnet, plate b, and plate c. The rotating ring is rotatably mounted on plate a. The magnetic field shield is connected to the rotating ring. Plate b has multiple blades arranged circumferentially on the outer surface of the magnetic field shield. The cylinder is rotatably mounted on plate a. Multiple blades are arranged circumferentially on the outer surface of the cylinder. The motor is mounted on plate a and is connected to the cylinder and the rotating ring for transmission. Plate c is located inside the cylinder. The electromagnet is mounted on plate c.

[0009] A steering adjustment mechanism, connected to the track robot and plate a, is used to adjust the distance between the weeding mechanism and the track robot.

[0010] The detection mechanism, connected to the steering adjustment mechanism, is used to collect the magnetic field of the pipeline.

[0011] Preferably, a gear ring is connected to the rotating ring; gear a is connected to the cylinder; gear b is connected to the output end of the motor; gear b meshes with both the gear ring and gear a.

[0012] Preferably, plate a is connected to multiple U-shaped blocks that span the toothed ring to ensure the stability of the rotational connection between plate a and the rotating ring.

[0013] Preferably, the steering adjustment mechanism includes a turntable, a T-shaped plate, a clamping plate, a fixing plate, and bolts b; the turntable is rotatably mounted on the track robot; there are two T-shaped plates connected to the turntable; there are four clamping plates, with two clamping plates on each side of the T-shaped plate; the T-shaped plate has multiple evenly distributed bolt holes; the clamping plate has a pair of holes a; the fixing plate has holes b, and bolts b are inserted into the holes b; bolts b pass through holes a and are threadedly connected to the bolt holes.

[0014] Preferably, the T-shaped plate is provided with a scale; one end of the clamping plate is provided with a pointer that works in conjunction with the scale to precisely adjust the moving distance of the clamping plate.

[0015] Preferably, the detection mechanism includes an adjusting screw, a mounting block, a guide rod, a plate d, and a magnetic sensor; the mounting block is connected to the T-shaped plate; the guide rod is slidably connected to the mounting block; the guide rod is connected to the plate d; the adjusting screw is threadedly connected to the mounting block and rotatably connected to the plate d; and the magnetic sensor is connected to the plate d.

[0016] Preferably, a support caster is rotatably connected to plate a, and the support caster is adapted to the track frame to support the weeding mechanism.

[0017] Compared with the prior art, the above-mentioned technical solution of the present invention has the following beneficial technical effects:

[0018] By incorporating a track drive mechanism, appropriate track components are selected based on the pipeline laying trajectory. Bolts and nuts are used to splice the pipeline components, enabling the spliced ​​track structure to be laid according to the pipeline trajectory. This significantly enhances the flexibility of use, as the track structure is no longer limited to a straight shape but can be laid according to the pipeline laying trajectory.

[0019] By incorporating a weeding mechanism, the grass above the pipe can be cut and cleared away. At the same time, ferromagnetic objects such as wires in the grass can be magnetically attracted and recovered, preventing mechanical vibrations caused by wind from interfering with the stability of the magnetic field signal, and also preventing ferromagnetic objects in the grass from affecting the magnetic field of the pipe. Attached Figure Description

[0020] Figure 1 This is a perspective view of one embodiment of the present invention;

[0021] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle;

[0022] Figure 3 This is a schematic diagram of the external structure of the weeding mechanism in one embodiment of the present invention;

[0023] Figure 4 For this Figure 3 Enlarged structural diagram at point B;

[0024] Figure 5 This is a schematic diagram of the structure of the track robot and the detection mechanism in one embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the assembly structure of the weeding mechanism in one embodiment of the present invention;

[0026] Figure 7 This is a schematic cross-sectional view of the cylinder and gear a in one embodiment of the present invention.

[0027] Reference numerals: 1. Track robot; 2. Turntable; 3. T-plate; 301. Bolt hole; 4. Mounting block; 5. Clamping plate; 501. Hole a; 6. Plate a; 7. U-block; 8. Gear b; 9. Gear a; 10. Support caster; 11. Track frame; 12. Support block; 13. Magnetic field shield; 14. Magnetic sensor; 15. Plate d; 16. Guide rod; 17. Adjusting screw; 18. Plate b; 19. Blade; 20. Rotary ring; 21. Gear ring; 22. Cylinder; 23. Plate c; 24. Electromagnet; 25. Fixing plate; 26. Bolt b; 27. Pointer. Detailed Implementation

[0028] Example 1, as Figure 1-3 as well as Figure 6-7 As shown, the present invention proposes a trenchless weak magnetic detection device for oil and gas pipelines, which includes a track drive mechanism, a weeding mechanism, a steering adjustment mechanism, and a detection mechanism.

[0029] The track drive mechanism includes a track robot 1, a track assembly, bolts a, and nuts. Multiple track assemblies are connected to form a complete track structure. Each track assembly includes support blocks 12 and a track frame 11. Two support blocks 12 are provided, each with a slot. Two track frames 11 are connected to the inside of the slots. The casters on the track robot 1 are adapted to the track frame 11. Through holes are provided on the support blocks 12 between adjacent track assemblies. Bolts a pass through the through holes and cooperate with nuts to connect the support blocks 12.

[0030] It should be noted that the track robot 1 is an automated robot system that moves on a fixed track. It is commonly used in industries, warehousing, security and service fields. It is existing technology, and its specific structure and working principle will not be described in detail here.

[0031] It should be noted that the track components can be spliced ​​together. The track components can be designed to be straight or curved according to requirements. By splicing the track components together, the track structure is no longer limited to a straight shape but can be laid according to the pipeline laying trajectory, which significantly enhances the flexibility of use. The track robot 1 walks on the track components to drive the inspection mechanism to move, so that the inspection mechanism can move along the pipeline, which is convenient for comprehensive pipeline inspection. At the same time, the track robot 1 can push the weeding mechanism to move, providing driving force for the movement of the weeding mechanism, which can clear the grass above the pipeline and prevent the grass from affecting the inspection operation.

[0032] It is worth noting that, except for the relevant structures inside the magnetic field shield 13, all other structures in this embodiment are made of non-ferromagnetic materials to avoid interfering with the magnetic field of the pipeline.

[0033] The weeding mechanism includes plate a6, magnetic field shield 13, rotating ring 20, motor, cylinder 22, blade 19, electromagnet 24, plate b18, and plate c23. The rotating ring 20 is rotatably mounted on plate a6, and multiple U-shaped blocks 7 spanning the toothed ring 21 are connected to plate a6 to ensure the stability of the rotatable connection between plate a6 and the rotating ring 20. The magnetic field shield 13 is connected to the rotating ring 20 (the magnetic field shield 13 is made of a high-permeability material (such as permalloy, μ-metal) or a high-conductivity material (such as copper, aluminum), and uses magnetic flux shunting or eddy current cancellation mechanisms to achieve magnetic field shielding). Plate b18 has multiple parallel circumferential... The magnetic field shield 13 is distributed on the outer surface; the cylinder 22 is rotatably mounted on plate a6; multiple blades 19 are provided and circumferentially distributed on the outer surface of the cylinder 22; the motor is mounted on plate a6 and is connected to the cylinder 22 and the rotating ring 20 for transmission, and a gear ring 21 is connected to the rotating ring 20; a gear a9 is connected to the cylinder 22; a gear b8 is connected to the output end of the motor; the gear b8 meshes with both the gear ring 21 and the gear a9; plate c23 is located inside the cylinder 22; an electromagnet 24 is mounted on plate c23; a support caster 10 is rotatably connected to plate a6, and the support caster 10 is adapted to the track frame 11 to support the weeding mechanism;

[0034] It should be noted that the motor drives gear b8 to rotate, gear b8 drives gear a9 and gear ring 21 to rotate (gear a9 and gear ring 21 rotate in opposite directions), gear a9 drives cylinder 22 to rotate, and cylinder 22 rotates the blade 19 to rotate, thus cutting the grass. At the same time, under the action of electromagnet 24, ferromagnetic materials such as iron wires on the ground can be attracted to plate c23 inside cylinder 22 (under the action of magnetic attraction, the ferromagnetic materials are attracted to plate c23) for recycling, avoiding interference with the magnetic field of the pipeline. At the same time, gear ring 21 drives rotating ring 20 to rotate, rotating ring 20 drives magnetic field shield 13 to rotate, magnetic field shield 13 drives plate b18 to perform circular motion. The circular motion of plate b18 generates centrifugal force, which at the same time stirs the cut grass to rotate. Under the action of centrifugal force, the grass can be thrown away to prevent the cut grass from accumulating on the track assembly and affecting the movement of track robot 1.

[0035] It should be noted that weak magnetic field detection usually requires the magnetic sensor 14 to be in close contact with or near the pipe surface. If the grass is too dense, it may cause poor contact between the sensor and the ground, reducing signal quality; the grass may contain ferromagnetic impurities (such as iron wires or metal fragments), or mechanical vibrations caused by wind, which may interfere with the stability of the magnetic field signal. Therefore, it is necessary to cut and clear the grass.

[0036] A steering adjustment mechanism is connected to the track robot 1 and plate a6; it is used to adjust the distance between the weeding mechanism and the track robot 1, so that the motor, electromagnet 24 and other structures inside the magnetic field shield 13 are at a safe distance from the detection mechanism, reducing their impact on the detection mechanism.

[0037] The detection mechanism, connected to the steering adjustment mechanism, is used to collect the magnetic field of the pipeline.

[0038] Example 2, as Figure 2-5 As shown, this invention proposes a trenchless weak magnetic detection device for oil and gas pipelines. Compared to Embodiment 1, this embodiment further details the structure of the steering adjustment mechanism. The steering adjustment mechanism includes a turntable 2, a T-shaped plate 3, a clamping plate 5, a fixing plate 25, and bolts b26. The turntable 2 is rotatably mounted on the track robot 1. Two T-shaped plates 3 are provided and connected to the turntable 2. Four clamping plates 5 are provided, with two plates clamping each side of the T-shaped plate 3. The T-shaped plate 3 has multiple evenly distributed bolt holes 301. The clamping plate 5 has a pair of holes a501. The fixing plate 25 has a hole b, and bolts b26 are inserted into the hole b. Bolts b26 pass through the hole a501 and are threadedly connected to the bolt holes 301. The T-shaped plate 3 has a scale. One end of the clamping plate 5 has a pointer 27 that works with the scale to precisely adjust the movement distance of the clamping plate 5.

[0039] In this embodiment, by removing bolt b26 from bolt hole 301, the limiting position between clamping plate 5 and T-plate 3 is released. At this time, clamping plate 5 can be moved to adjust the distance between the weeding mechanism and the track robot 1. When clamping plate 5 moves, pointer 27 moves. Under the action of the scale on T-plate 3, the moving distance of clamping plate 5 can be accurately controlled, thereby controlling the moving distance of the weeding mechanism, so that the weeding mechanism and the track robot 1 maintain a safe distance. After the adjustment is completed, fixing plate 25 and bolt b26 are moved to the corresponding bolt hole 301, and bolt b26 is threaded through hole a501 and bolt hole 301 to achieve connection between clamping plate 5 and T-plate 3.

[0040] It should be noted that the magnetic field shield 13 can shield 50%-70% of the magnetic interference generated by the motor and electromagnet 24. Therefore, the safe distance between the weeding mechanism and the track robot 1 can be controlled at 2-5m, and can be adjusted appropriately within the safe distance range according to the size of the motor and electromagnet 24.

[0041] It is worth noting that the objects such as iron wires attracted by the electromagnet 24 during its movement are generally small ferromagnetic objects. Usually, it is sufficient to keep them 1-2m away from the detection mechanism. Therefore, after adjusting the safe distance, an additional 1-2m distance needs to be added.

[0042] Example 3, as Figure 5 As shown, this invention proposes a trenchless weak magnetic field detection device for oil and gas pipelines. Compared to Embodiment 2, this embodiment further details the structure of the detection mechanism. The detection mechanism includes an adjusting screw 17, a mounting block 4, a guide rod 16, a plate d15, and a magnetic sensor 14. The mounting block 4 is connected to the T-shaped plate 3. The guide rod 16 is slidably connected to the mounting block 4 and connected to the plate d15. The adjusting screw 17 is threadedly connected to the mounting block 4 and rotatably connected to the plate d15. The magnetic sensor 14 is connected to the plate d15 and establishes an information transmission connection with an external weak magnetic field detection system, which includes, but is not limited to, systems installed on a track robot 1.

[0043] In this embodiment, the plate d15 is raised and lowered by rotating the adjusting screw 17, and the plate d15 raises and lowers the magnetic sensor 14. The distance between the magnetic sensor 14 and the ground can be adjusted. The guide rod 16 is slidably connected to the mounting block 4, which guides the raising and lowering of the plate d15 and prevents the plate d15 from causing the magnetic sensor 14 to rotate with the adjusting screw 17.

[0044] It should be noted that the inspection height needs to be adjusted according to the burial depth of the pipeline: for burial depth <1.5m, the inspection height is 0.1-0.5m; for burial depth 1.5-3m, the inspection height is 0.3-1m; and for burial depth >3m, the inspection height is 0.5-1.5m.

[0045] In summary, when using this invention, a suitable track component is selected according to the pipeline laying trajectory. Bolt a and nut are used to splice the pipeline components, allowing the resulting track structure to be laid according to the pipeline trajectory. This significantly enhances the flexibility of use, as the track structure is no longer limited to a straight line. Then, the track robot 1 and the weeding mechanism are placed on the track component. The distance between the weeding mechanism and the track robot 1 is adjusted according to the size of the motor and electromagnet 24 used in the weeding mechanism. The clamp is released by removing bolt b26 from the bolt hole 301. The clamping plate 5 is positioned between the plate 5 and the T-shaped plate 3. At this time, the clamping plate 5 can be moved to adjust the distance between the weeding mechanism and the track robot 1. When the clamping plate 5 moves, it drives the pointer 27 to move. Under the action of the scale on the T-shaped plate 3, the moving distance of the clamping plate 5 can be accurately controlled, thereby controlling the moving distance of the weeding mechanism, so that the weeding mechanism and the track robot 1 maintain a safe distance. After the adjustment is completed, the fixing plate 25 and the bolt b26 are moved to the corresponding bolt hole 301, and the bolt b26 is threaded through the hole a501 and connected to the bolt hole 301, thus realizing the connection between the clamping plate 5 and the T-shaped plate 3.

[0046] After adjustment, based on the detected pipeline burial depth, the plate d15 is raised or lowered by rotating the adjusting screw 17, and the plate d15 raises or lowers the magnetic sensor 14, thereby adjusting the distance between the magnetic sensor 14 and the ground.

[0047] After adjustment, the pipe robot is activated. The pipe robot, in conjunction with T-shaped plate 3 and clamping plate 5, propels the weeding mechanism along the track assembly. When the weeding mechanism reaches a curve, turntable 2 rotates, and support casters 10 also rotate, allowing the weeding mechanism to move along the curve. During the movement of the weeding mechanism, the motor drives gear b8 to rotate, which in turn drives gear a9 and gear ring 21 to rotate (gear a9 and gear ring 21 rotate in opposite directions). Gear a9 drives cylinder 22 to rotate, and the rotation of cylinder 22 drives blade 19 to rotate, thus cutting the grass. Simultaneously, the electric... Under the action of magnet 24, ferromagnetic materials such as iron wires on the ground can be attracted to plate c23 inside cylinder 22 (under the action of magnetic attraction, the ferromagnetic materials are attracted to plate c23) for recycling, avoiding interference with the magnetic field of the pipeline; at the same time, toothed ring 21 drives rotating ring 20 to rotate, rotating ring 20 drives magnetic field shield 13 to rotate, magnetic field shield 13 drives plate b18 to make circular motion, the circular motion of plate b18 generates centrifugal force, and at the same time, it moves the cut grass to rotate. Under the action of centrifugal force, the grass can be thrown to all sides to prevent the cut grass from accumulating on the track assembly and affecting the movement of track robot 1.

[0048] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A trenchless weak magnetic field detection device for oil and gas pipelines, characterized in that, include: The track drive mechanism includes a track robot (1), a track assembly, bolts a and nuts; the track assembly is provided in multiple sets and spliced ​​together to form a complete track structure; the track assembly includes a support block (12) and a track frame (11); there are two support blocks (12) and slots are provided on them; there are two track frames (11) and they are connected to the inside of the slots; the casters on the track robot (1) are adapted to the track frame (11); through holes are provided on the support blocks (12) between adjacent track assemblies; bolts a pass through the through holes and cooperate with nuts to realize the connection between the support blocks (12); The weeding mechanism includes plate a (6), magnetic field shield (13), rotating ring (20), motor, cylinder (22), blades (19), electromagnet (24), plate b (18), and plate c (23); the rotating ring (20) is rotatably mounted on plate a (6); the magnetic field shield (13) is connected to the rotating ring (20); plate b (18) has multiple blades circumferentially distributed on the outer surface of the magnetic field shield (13); the cylinder (22) is rotatably mounted on plate a (6); multiple blades (19) are circumferentially distributed on the outer surface of the cylinder (22); the motor is mounted on plate a (6) and is connected to the cylinder (22) and rotating ring (20) for transmission; plate c (23) is located inside the cylinder (22); the electromagnet (24) is mounted on plate c (23); A steering adjustment mechanism, which is connected to the track robot (1) and plate a (6), is used to adjust the distance between the weeding mechanism and the track robot (1). The detection mechanism, connected to the steering adjustment mechanism, is used to collect the magnetic field of the pipeline.

2. The trenchless weak magnetic field detection device for oil and gas pipelines according to claim 1, characterized in that, A gear ring (21) is connected to the rotating ring (20); a gear a (9) is connected to the cylinder (22); a gear b (8) is connected to the output end of the motor; and gear b (8) meshes with both the gear ring (21) and gear a (9).

3. The trenchless weak magnetic field detection device for oil and gas pipelines according to claim 1, characterized in that, Multiple U-shaped blocks (7) spanning the toothed ring (21) are connected to plate a (6) to ensure the stability of the rotational connection between plate a (6) and the rotating ring (20).

4. The trenchless weak magnetic field detection device for oil and gas pipelines according to claim 1, characterized in that, The steering adjustment mechanism includes a turntable (2), a T-plate (3), a clamping plate (5), a fixing plate (25), and bolts b (26); the turntable (2) is rotatably mounted on the track robot (1); there are two T-plates (3) connected to the turntable (2); there are four clamping plates (5), with two plates clamped on both sides of the T-plate (3); the T-plate (3) has multiple evenly distributed bolt holes (301); the clamping plate (5) has a pair of holes a (501); the fixing plate (25) has holes b, and bolts b (26) are inserted into holes b; bolts b (26) pass through holes a (501) and are threadedly connected to bolt holes (301).

5. The trenchless weak magnetic field detection device for oil and gas pipelines according to claim 4, characterized in that, The T-shaped plate (3) has a scale; one end of the clamp (5) has a pointer (27) which, together with the scale, is used to precisely adjust the moving distance of the clamp (5).

6. The trenchless weak magnetic field detection device for oil and gas pipelines according to claim 1, characterized in that, The detection mechanism includes an adjusting screw (17), a mounting block (4), a guide rod (16), a plate d (15), and a magnetic sensor (14); the mounting block (4) is connected to the T-shaped plate (3); the guide rod (16) is slidably connected to the mounting block (4); the guide rod (16) is connected to the plate d (15); the adjusting screw (17) is threadedly connected to the mounting block (4) and rotatably connected to the plate d (15); the magnetic sensor (14) is connected to the plate d (15).

7. The trenchless weak magnetic field detection device for oil and gas pipelines according to claim 1, characterized in that, A support caster (10) is rotatably connected to plate a (6). The support caster (10) is adapted to the track frame (11) and is used to support the weeding mechanism.

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