Gas leakage detection device for natural gas pipeline transportation

Abstract

The invention discloses a natural gas pipeline conveying gas leakage detection device, and belongs to the field of gas pipeline detection. A natural gas pipeline conveying gas leakage detection device comprises a first detection ring and a second detection ring rotationally connected to the first detection ring, and further comprises installation rings symmetrically and fixedly connected to the inner walls of the first detection ring and the second detection ring, and walking mechanisms are fixedly connected to the installation rings; the driving device is used for driving the first detection ring and the second detection ring to spirally walk along the pipeline surface; the air storage tank is fixedly connected to the outer wall of the first detection ring and the outer wall of the second detection ring, and the inner wall of the first detection ring and the inner wall of the second detection ring are fixedly connected with an air extracting pump communicated with the air storage tank; the problems that natural gas pipeline detection is not comprehensive, and the pipeline is difficult to repair in time can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas pipeline detection, and particularly to a leakage detection device for natural gas pipeline transportation. Background Art

[0002] A natural gas pipeline refers to a pipeline that transports natural gas from the production site or treatment plant to the urban gas distribution center or industrial enterprise users, also known as a gas transmission pipeline. Using natural gas pipelines to transport natural gas is a way to transport large amounts of natural gas on land. After long-term use, the pipeline will age, or due to long-term contact with corrosive substances, the pipeline will corrode, and being damaged by external forces will all cause pipeline leakage, which will not only pollute the surrounding environment but also easily lead to safety accidents.

[0003] Currently, when detecting leaks in large natural gas pipelines, it is usually through staff holding detection equipment and moving along the pipeline surface, or through a moving device moving along the direction of the pipeline to conduct inspections on the pipeline. The above methods are all difficult to comprehensively detect the pipeline. On the one hand, it is not convenient to detect the leakage location of the pipeline and there are certain safety hazards. On the other hand, after the leakage location is detected, due to the presence of natural gas in the surrounding environment, professionals cannot repair it in time, resulting in continuous waste of natural gas and increasing the safety hazards of the surrounding environment. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art that the detection of natural gas pipelines is not comprehensive and it is difficult to repair the pipelines in time, and to propose a leakage detection device for natural gas pipeline transportation.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions: A leakage detection device for natural gas pipeline transportation, including a first detection ring and a second detection ring rotatably connected to the first detection ring, and further including: a mounting ring symmetrically and fixedly connected to the inner walls of the first detection ring and the second detection ring, a traveling mechanism fixedly connected to the mounting ring for driving the first detection ring and the second detection ring to travel spirally along the pipeline surface; a gas storage tank fixedly connected to the outer walls of the first detection ring and the second detection ring, an air extraction pump fixedly connected to the inner walls of the first detection ring and the second detection ring and communicated with the gas storage tank; a plugging mechanism arranged on the inner walls of the first detection ring and the second detection ring, the plugging mechanism being connected to the air extraction pump for plugging the leakage location; a detector fixedly connected to the inner walls of the first detection ring and the second detection ring for detecting the leakage condition and location of the pipeline.

[0006] For the convenience of comprehensively detecting air leakage in the pipeline, preferably, the traveling mechanism includes multiple groups of clamping seats fixedly connected to the mounting ring. A first spring is fixedly connected inside the clamping seat. The end of the clamping seat is rotatably connected to a rotating shaft, a guide wheel is fixedly connected to the rotating shaft, and a driving bevel gear is fixedly connected to the end of the rotating shaft. Among them, the clamping seats are evenly distributed on the mounting ring, and the rotating shafts on both sides are vertically distributed. When the guide wheels rotate, one side of the guide wheels rotates along the axial direction of the pipeline, and the guide wheels on the other side rotate along the circumferential direction of the pipeline.

[0007] To facilitate adjusting the moving mode of the device, further, a driving motor fixedly connected to the first detection ring is also included. The output end of the driving motor is fixedly connected to a driving wheel. A telescopic shaft is rotatably connected to the side of the mounting ring and the first detection ring close to the driving bevel gear. The telescopic shaft includes a fixed part and a movable part. An electromagnet is fixedly connected to the bottom of the fixed part. A permanent magnet block is fixedly connected to the side of the movable part close to the fixed part. A second spring is fixedly connected between the electromagnet and the permanent magnet block. The end of the movable part is fixedly connected to a driven bevel gear meshing with the driving bevel gear. A driven wheel is fixedly connected to the fixed part. A first belt is sleeved between the driving wheel and the driven wheel. Among them, a sealing limit strip is provided between the fixed part and the movable part, enabling the movable part to move along the direction of the fixed part. When the electromagnet is energized, it shows magnetism and there is a suction force with the permanent magnet block.

[0008] To facilitate driving the device to move spirally along the pipeline, furthermore, the gas storage tank includes multiple groups and is evenly distributed on the outer walls of the first detection ring and the second detection ring. The shaft end of the air extraction pump is fixedly connected to a linkage wheel. Multiple positioning wheels matching the linkage wheel are rotatably connected to the inner walls of the first detection ring and the second detection ring. A second belt is sleeved between the linkage wheel and the positioning wheels. Among them, the positioning wheels are located between adjacent groups of linkage wheels. The second belt is detachable. The air inlet end of the air extraction pump is close to the outer wall of the pipeline.

[0009] To facilitate unwinding the sealing tape, furthermore, the plugging mechanism includes an adjusting seat fixedly connected to the side of the second detection ring close to the second belt. A third spring is fixedly connected inside the adjusting seat. The end of the adjusting seat is rotatably connected to a winding roller. A first rotating wheel and a second rotating wheel are rotatably connected to the adjusting seat. Among them, the shaft end of the first rotating wheel is connected to the shaft end of the winding roller. The second belt is located between the first rotating wheel and the second rotating wheel.

[0010] To ensure the stability of plugging the air leakage position, further, it further includes a compression seat fixedly connected to the inner wall of the second detection ring. A fifth spring is fixedly connected inside the compression seat. A pressure wheel is rotatably connected to the end of the compression seat. A clamping member is arranged on one side of the compression seat close to the pressure wheel. Among them, the plugging tape on the winding roller is in close fit with the outer wall of the pressure wheel through the clamping member. The clamping member can stretch along the surface of the winding roller, and the compression seat and the clamping seat are connected and communicated through a pipeline.

[0011] To improve the plugging effect of the plugging tape, further, it further includes a tensioning seat fixedly connected to the side of the second detection ring close to the adjustment seat. A fourth spring is fixedly connected inside the tensioning seat. A cleaning roller is rotatably connected to the end of the tensioning seat. A second belt pulley is fixedly connected to the shaft end of the cleaning roller on the side close to the second runner. A fourth belt is sleeved between the second belt pulley and the first belt pulley. Among them, the surface of the cleaning roller is in a brush shape.

[0012] To facilitate the detection of the air leakage position of the pipeline, further, multiple groups of detectors are evenly distributed on the inner walls of the first detection ring and the second detection ring. The detectors are electrically connected to the electromagnet, the driving motor, and the air extraction pump.

[0013] To ensure the stability of the device moving along the pipeline, further, multiple groups of rollers are rotatably connected to the outer wall of the guide wheel. The rollers are evenly distributed on the guide wheel, and the rotation direction of the rollers is perpendicular to the rotation direction of the guide wheel.

[0014] To ensure the stability of the device during movement, preferably, it further includes a fixed clamping plate fixedly connected to the outer wall of the first detection ring. A ratchet tooth is fixedly connected to the outer wall of the second detection ring. The fixed clamping plate and the ratchet tooth are close to each other, and the side of the ratchet tooth close to the fixed clamping plate is inclined.

[0015] Compared with the prior art, the present invention provides a natural gas pipeline transportation air leakage detection device, which has the following beneficial effects: 1. For this natural gas pipeline transportation air leakage detection device, through the traveling mechanism, the device can be driven to move spirally along the surface of the pipeline, so as to facilitate the all-round air leakage detection of the pipeline, and thus the air leakage position of the pipeline can be accurately detected, which can not only improve the efficiency of pipeline air leakage detection, but also improve the effect of pipeline air leakage detection.

[0016] 2. For this natural gas pipeline transportation air leakage detection device, the air leakage position of the pipeline is detected by the detector, and the position of the plugging mechanism is adjusted through the traveling mechanism, so as to facilitate the plugging of the air leakage position of the pipeline by the plugging mechanism. In addition, the natural gas in the surrounding environment can be extracted by the air extraction pump to reduce the safety hazards in the surrounding environment and at the same time reduce the waste of natural gas.

[0017] 3. The gas pipeline leakage detection device can drive the cleaning roller to clean the stains on the surface of the pipeline leakage position before plugging the leakage position of the pipeline through the plugging mechanism and the air extraction pump, so as to improve the plugging effect of the subsequent leakage position, further reduce the waste of natural gas, and also facilitate the subsequent staff to repair the leakage position.

[0018] The parts not involved in this device are the same as the prior art or can be implemented by the prior art. The present invention can overcome the problems of incomplete detection of gas pipelines and difficulty in timely repairing pipelines. Brief Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of a gas pipeline transportation leakage detection device proposed by the present invention Figure 1 ; Figure 2 is a schematic structural diagram of a gas pipeline transportation leakage detection device proposed by the present invention Figure 2 ; Figure 3 is a schematic partial structural diagram of a gas pipeline transportation leakage detection device proposed by the present invention Figure 1 ; Figure 4 is a schematic partial structural diagram of a gas pipeline transportation leakage detection device proposed by the present invention Figure 2 ; Figure 5 is a schematic cross-sectional structural diagram of the clamping seat and the telescopic shaft in a gas pipeline transportation leakage detection device proposed by the present invention; Figure 6 is a schematic cross-sectional structural diagram of the second detection ring in a gas pipeline transportation leakage detection device proposed by the present invention; Figure 7 is a gas pipeline transportation leakage detection device proposed by the present invention Figure 3 Schematic diagram of the structure of part A therein; Figure 8 is a gas pipeline transportation leakage detection device proposed by the present invention Figure 4 Schematic diagram of the structure of part B therein.

[0020] In the figure: 1. First detection ring; 2. Second detection ring; 3. Fixed clamping plate; 4. Ratchet teeth; 5. Mounting ring; 6. Clamping seat; 7. First spring; 8. Rotating shaft; 9. Guide wheel; 10. Driving bevel gear; 11. Roller; 12. Telescopic shaft; 13. Electromagnet; 14. Permanent magnet block; 15. Second spring; 16. Driven bevel gear; 17. Driven wheel; 18. Driving motor; 19. Driving wheel; 20. First belt; 21. Air storage tank; 22. Air pump; 23. Linking wheel; 24. Positioning wheel; 25. Second belt; 26. Adjusting seat; 27. Third spring; 28. Winding roller; 29. First runner; 30. Second runner; 31. First pulley; 32. Tensioning seat; 33. Fourth spring; 34. Cleaning roller; 35. Second pulley; 36. Fourth belt; 37. Compression seat; 38. Fifth spring; 39. Pressing wheel; 40. Clamping member; 41. Detector. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0022] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0023] Embodiment: Refer to Figures 1 - 8, A natural gas pipeline leakage detection device, including a first detection ring 1 and a second detection ring 2 rotatably connected to the first detection ring 1, further including: an installation ring 5, symmetrically and fixedly connected to the inner walls of the first detection ring 1 and the second detection ring 2, a traveling mechanism fixedly connected to the installation ring 5 for driving the first detection ring 1 and the second detection ring 2 to travel spirally along the surface of the pipeline; a gas storage tank 21, fixedly connected to the outer walls of the first detection ring 1 and the second detection ring 2, an air extraction pump 22 fixedly connected to the inner walls of the first detection ring 1 and the second detection ring 2 and communicating with the gas storage tank 21; a plugging mechanism, arranged on the inner walls of the first detection ring 1 and the second detection ring 2, connected to the air extraction pump 22 for plugging the leaking position; a detector 41, fixedly connected to the inner walls of the first detection ring 1 and the second detection ring 2 for detecting the leakage condition and position of the pipeline, the detector 41 includes multiple groups, evenly distributed on the inner walls of the first detection ring 1 and the second detection ring 2, and the detector 41 is electrically connected to an electromagnet 13, a driving motor 18 and the air extraction pump 22.

[0024] It should be noted that a one-way valve is usually arranged between the gas storage tank 21 and the air extraction pump 22. When the air extraction pump 22 works, gas can be extracted into the gas storage tank 21, and when the air extraction pump 22 stops working, the gas in the gas storage tank 21 will not be discharged. Among them, the specific structure of the detector 41 can refer to the technical solutions in the prior art, which can be known to those skilled in the art and will not be elaborated here. In addition, an alarm can be set so that when the detector 41 detects leakage, the staff can be reminded in time.

[0025] Refer to Figure 1 、 Figure 2 and Figure 5 , The traveling mechanism includes multiple groups of clamping seats 6 fixedly connected to the installation ring 5. A first spring 7 is fixedly connected inside the clamping seat 6. A rotating shaft 8 is rotatably connected to the end of the clamping seat 6. A guide wheel 9 is fixedly connected to the rotating shaft 8. A driving bevel gear 10 is fixedly connected to the end of the rotating shaft 8. Among them, the clamping seats 6 are evenly distributed on the installation ring 5, and the rotating shafts 8 on both sides are vertically distributed. When the guide wheel 9 rotates, one of the guide wheels 9 rotates along the axial direction of the pipeline, and the other guide wheel 9 rotates along the circumferential direction of the pipeline.

[0026] After opening the first detection ring 1 and the second detection ring 2, the device can be sleeved on the pipeline. Under the action of the first spring 7, the guide wheel 9 can be closely attached to the outer wall of the pipeline to ensure the stability of the device during movement. When the device moves along the pipeline, one of the guide wheels 9 makes the device move along the axial direction of the pipeline, and the other guide wheel 9 makes the device rotate along the axial direction of the pipeline, so that the device moves spirally along the pipeline, which is convenient for comprehensive leakage detection of the pipeline and for the staff to accurately find the leakage position of the pipeline.

[0027] Reference Figure 3 、 Figure 5 and Figure 7 , it further includes a drive motor 18 fixedly connected to the first detection ring 1. The output end of the drive motor 18 is fixedly connected with a drive wheel 19. A telescopic shaft 12 is rotatably connected to the side of the mounting ring 5 and the first detection ring 1 close to the drive bevel gear 10. The telescopic shaft 12 includes a fixed part and a movable part. The bottom of the fixed part is fixedly connected with an electromagnet 13. A permanent magnet block 14 is fixedly connected to the side of the movable part close to the fixed part. A second spring 15 is fixedly connected between the electromagnet 13 and the permanent magnet block 14. The end of the movable part is fixedly connected with a driven bevel gear 16 meshing with the drive bevel gear 10. A driven wheel 17 is fixedly connected to the fixed part. A first belt 20 is sleeved between the drive wheel 19 and the driven wheel 17. Wherein, a sealing limit strip is arranged between the fixed part and the movable part, so that the movable part can move along the direction of the fixed part. When the electromagnet 13 is energized, it shows magnetism and there is a suction force between it and the permanent magnet block 14.

[0028] Initially, the driven bevel gear 16 is always meshed with the drive bevel gear 10 under the action of the second spring 15. When starting the drive motor 18, the drive bevel gears 10 on both sides are driven to rotate synchronously through the linkage wheel 23, the first belt 20 and the driven wheel 17, so that the guide wheels 9 on both sides rotate synchronously, realizing the spiral movement of the equipment. When the detector 41 detects natural gas, the electromagnet 13 close to the side of the guide wheel 9 rotating along the axial direction of the pipeline is energized, generating a suction force with the permanent magnet block 14, so that the driven bevel gear 16 in the corresponding direction is disengaged from the drive bevel gear 10, that is, the equipment stops moving along the axial direction of the pipeline, and the equipment rotates circumferentially along the pipeline, so as to accurately find the leakage position of the pipeline.

[0029] Reference Figures 1 - 4 , the gas storage tank 21 includes multiple groups and is evenly distributed on the outer walls of the first detection ring 1 and the second detection ring 2. The shaft end of the air extraction pump 22 is fixedly connected with a linkage wheel 23. Multiple positioning wheels 24 matching with the linkage wheel 23 are rotatably connected to the inner walls of the first detection ring 1 and the second detection ring 2. A second belt 25 is sleeved between the linkage wheel 23 and the positioning wheels 24. Wherein, the positioning wheels 24 are located between two adjacent groups of linkage wheels 23. The second belt 25 is of a detachable type, and the intake end of the air extraction pump 22 is close to the outer wall of the pipeline.

[0030] During the working process, if the detector 41 does not detect natural gas, the air extraction pump 22 is in a shutdown state. When the detector 41 detects natural gas, the air extraction pump 22 starts to work, so as to pump the natural gas in the surrounding environment into the interior of the gas storage tank 21. It should be noted that the second belt 25 is of a detachable type for easy installation of the second belt 25.

[0031] Reference Figure 4 、Figure 6 and Figure 8 The plugging mechanism includes an adjusting seat 26 fixedly connected to the side of the second detection ring 2 close to the second belt 25. A third spring 27 is fixedly connected inside the adjusting seat 26. A winding roller 28 is rotatably connected to the end of the adjusting seat 26. A first runner 29 and a second runner 30 are rotatably connected to the adjusting seat 26. Among them, the shaft end of the first runner 29 is connected to the shaft end of the winding roller 28. The second belt 25 is located between the first runner 29 and the second runner 30.

[0032] Initially, the winding roller 28 is installed on the adjusting seat 26. When plugging the air leakage position of the pipeline, the second belt 25 drives the winding roller 28 to rotate, unwind the plugging tape, so as to plug the plugging tape on the surface of the pipeline, thereby stopping the air leakage at the air leakage position of the pipeline, reducing the safety hazards of the surrounding environment, and at the same time reducing the waste of natural gas.

[0033] Refer to Figure 4 and Figure 6 It also includes a compression seat 37 fixedly connected to the inner wall of the second detection ring 2. A fifth spring 38 is fixedly connected inside the compression seat 37. A pressing wheel 39 is rotatably connected to the end of the compression seat 37. A clamping member 40 is arranged on the side of the compression seat 37 close to the pressing wheel 39. Among them, the plugging tape on the winding roller 28 is in close contact with the outer wall of the pressing wheel 39 through the clamping member 40. The clamping member 40 can stretch along the surface of the winding roller 28, and the compression seat 37 is connected to the clamping seat 6 through a pipeline.

[0034] After the air leakage position of the pipeline is detected, the clamping seat 6 is in a compressed state, and the gas in the clamping seat 6 is compressed into the inside of the compression seat 37, driving the compression seat 37 to extend outwards, thereby driving the pressing wheel 39 to be in close contact with the outer wall of the pipeline, so as to ensure that the plugging tape can effectively plug the air leakage position of the pipeline. Initially, the end of the plugging tape will be in close contact with the pressing wheel 39 under the action of the clamping member 40. When the plugging tape is in contact with the outer wall of the pipeline, as the first detection ring 1 and the second detection ring 2 rotate, the plugging tape will be separated from the clamping member 40, thus realizing the plugging of the air leakage position.

[0035] Refer to Figure 4 、 Figure 6 and Figure 8 It also includes a tensioning seat 32 fixedly connected to the side of the second detection ring 2 close to the adjusting seat 26. A fourth spring 33 is fixedly connected inside the tensioning seat 32. A cleaning roller 34 is rotatably connected to the end of the tensioning seat 32. A second belt pulley 35 is fixedly connected to the shaft end of the cleaning roller 34 on the side close to the second runner 30. A fourth belt 36 is sleeved between the second belt pulley 35 and the first belt pulley 31. Among them, the surface of the cleaning roller 34 is brush-shaped.

[0036] When the pressing wheel 39 is in contact with the outer wall of the pipeline, the sealing tape is in a tensioned state, and at the same time, it will drive the adjusting seat 26 to extend outwards to ensure the tensioning force of the sealing tape (the winding roller 28 itself has a certain resistance and requires a certain force to make it rotate). At this time, the second belt 25 is in contact with the second runner 30, so as to drive the cleaning roller 34 to rotate through the fourth belt 36. And when the adjusting seat 26 extends outwards, under the action of the fourth spring 33, it drives the tensioning seat 32 to extend outwards, making the cleaning roller 34 close to the outer wall of the pipeline, so as to facilitate the cleaning of the outer wall of the pipeline, enabling the sealing tape to be in close contact with the outer wall of the pipeline, thereby improving the sealing effect of the air leakage position of the pipeline.

[0037] Refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , a plurality of groups of rollers 11 are rotatably connected to the outer wall of the guide wheel 9. The rollers 11 are evenly distributed on the guide wheel 9. The rotation direction of the rollers 11 is perpendicular to the rotation direction of the guide wheel 9. It also includes a fixed clamping plate 3 fixedly connected to the outer wall of the first detection ring 1. A ratchet 4 is fixedly connected to the outer wall of the second detection ring 2. The fixed clamping plate 3 and the ratchet 4 are close to each other, and the side of the ratchet 4 close to the fixed clamping plate 3 is inclined.

[0038] The rollers 11 on the surface of the guide wheel 9 can reduce the wear between the guide wheel 9 and the outer wall of the pipeline when the guide wheel 9 rotates, thereby improving the stability of the equipment movement. It should be noted that the fixed clamping plate 3 has elasticity. When opening the first detection ring 1 and the second detection ring 2, pulling the fixed clamping plate 3 outwards can make it disengage from the ratchet 4, so as to facilitate opening the first detection ring 1 and the second detection ring 2, thereby installing the equipment on the pipeline. When closing the first detection ring 1 and the second detection ring 2, directly rotate the first detection ring 1 and the second detection ring 2 along the side close to each other, and under the action of the fixed clamping plate 3 and the ratchet 4, the first detection ring 1 and the second detection ring 2 can be quickly fixed.

[0039] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent replacements or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A gas pipeline transmission leakage detection device, comprising a first detection ring (1) and a second detection ring (2) rotatably connected to the first detection ring (1), characterized in that: Also includes: The mounting ring (5) is symmetrically fixedly connected to the inner walls of the first detection ring (1) and the second detection ring (2); the mounting ring (5) is fixedly connected to a walking mechanism for driving the first detection ring (1) and the second detection ring (2) to move in a spiral shape along the surface of the pipeline; An air storage tank (21) is fixedly connected to the outer walls of the first detection ring (1) and the second detection ring (2); an air pump (22) in communication with the air storage tank (21) is fixedly connected to the inner walls of the first detection ring (1) and the second detection ring (2); A blocking mechanism is arranged on the inner walls of the first detection ring (1) and the second detection ring (2), the blocking mechanism being connected to the air extraction pump (22) and used for blocking the leaking position; The detector (41) is fixedly connected to the inner walls of the first detection ring (1) and the second detection ring (2) and is used to detect the leakage condition and position of the pipeline.

2. A gas pipeline leakage detection device according to claim 1, characterized in that: The walking mechanism comprises a plurality of clamping seats (6) fixedly connected to the mounting ring (5), a first spring (7) being fixedly connected inside the clamping seat (6), an end of the clamping seat (6) being rotatably connected to a rotating shaft (8), a guide wheel (9) being fixedly connected to the rotating shaft (8), and a driving bevel gear (10) being fixedly connected to the end of the rotating shaft (8). The clamping seats (6) are evenly distributed on the mounting ring (5), and the rotating shafts (8) on both sides are vertically distributed. When the guide wheel (9) rotates, the guide wheel (9) on one side rotates along the axial direction of the pipeline, and the guide wheel (9) on the other side rotates along the circumferential direction of the pipeline.

3. A gas pipeline leakage detection device according to claim 2, characterized in that: It also comprises a driving motor (18) fixedly connected to the first detection ring (1), the output end of the driving motor (18) being fixedly connected to a driving wheel (19), the mounting ring (5) and the first detection ring (1) being rotatably connected to a telescopic shaft (12) on a side close to the driving bevel gear (10), the telescopic shaft (12) comprising a fixed portion and a movable portion, the bottom of the fixed portion being fixedly connected to an electromagnet (13), the side of the movable portion close to the fixed portion being fixedly connected to a permanent magnet block (14), a second spring (15) being fixedly connected between the electromagnet (13) and the permanent magnet block (14), an end of the movable portion being fixedly connected to a driven bevel gear (16) meshing with the driving bevel gear (10), the fixed portion being fixedly connected to a driven wheel (17), a first belt (20) being sleeved between the driving wheel (19) and the driven wheel (17), A sealing limit strip is provided between the fixed part and the movable part, so that the movable part can move in the direction of the fixed part. When the electromagnet (13) is energized, it becomes magnetic and has an attractive force with the permanent magnet block (14).

4. A gas pipeline transmission leakage detection device according to claim 3, characterized in that: The gas storage tank (21) comprises a plurality of groups of uniformly distributed on the outer walls of the first detection ring (1) and the second detection ring (2); a linkage wheel (23) is fixedly connected to the shaft end of the air extraction pump (22); a plurality of groups of positioning wheels (24) matching the linkage wheels (23) are rotatably connected to the inner walls of the first detection ring (1) and the second detection ring (2); a second belt (25) is sleeved between the linkage wheel (23) and the positioning wheel (24); The positioning wheel (24) is located between two adjacent sets of linkage wheels (23), the second belt (25) is detachable, and the air inlet end of the vacuum pump (22) is close to the outer wall of the pipeline.

5. A gas pipeline transmission leakage detection device according to claim 4, characterized in that: The blocking mechanism comprises an adjustment seat (26) fixedly connected to a side of the second detection ring (2) close to the second belt (25); a third spring (27) is fixedly connected inside the adjustment seat (26); a winding roller (28) is rotatably connected to the end of the adjustment seat (26); and a first rotating wheel (29) and a second rotating wheel (30) are rotatably connected to the adjustment seat (26). The shaft end of the first rotating wheel (29) is connected to the shaft end of the winding roller (28), and the second belt (25) is located between the first rotating wheel (29) and the second rotating wheel (30).

6. A gas pipeline transmission leakage detection device according to claim 5, characterized in that: It also comprises a compression seat (37) fixedly connected to the inner wall of the second detection ring (2), a fifth spring (38) being fixedly connected inside the compression seat (37), an end of the compression seat (37) being rotatably connected to a pressure wheel (39), and a clamping member (40) being provided on a side of the compression seat (37) close to the pressure wheel (39). The sealing tape on the winding roller (28) is tightly fitted to the outer wall of the pressure wheel (39) via a clamping piece (40); the clamping piece (40) can be extended and retracted along the surface of the winding roller (28); and the compression seat (37) and the clamping seat (6) are connected via a pipeline.

7. A gas pipeline transmission leakage detection device according to claim 5, characterized in that: It also comprises a tensioning seat (32) fixedly connected to a side of the second detection ring (2) close to the adjustment seat (26); a fourth spring (33) is fixedly connected inside the tensioning seat (32); a cleaning roller (34) is rotatably connected to the end of the tensioning seat (32); a second pulley (35) is fixedly connected to the axial end of the cleaning roller (34) close to the second rotating wheel (30); a fourth belt (36) is sleeved between the second pulley (35) and the first pulley (31); and a surface of the cleaning roller (34) is in a brush shape.

8. A gas pipeline transmission leakage detection device according to claim 4, characterized in that: The detectors (41) include a plurality of groups evenly distributed on the inner walls of the first detection ring (1) and the second detection ring (2); the detectors (41) are electrically connected to the electromagnet (13), the drive motor (18) and the air pump (22).

9. A gas pipeline transmission leakage detection device according to claim 2, characterized in that: A plurality of groups of rollers (11) are rotatably connected to the outer wall of the guide wheel (9); the rollers (11) are evenly distributed on the guide wheel (9); and the rotation direction of the rollers (11) is perpendicular to the rotation direction of the guide wheel (9).

10. A gas pipeline transmission leakage detection device according to claim 1, characterized in that: It also comprises a fixed clamping plate (3) fixedly connected to the outer wall of the first detection ring (1), a ratchet (4) fixedly connected to the outer wall of the second detection ring (2), the fixed clamping plate (3) and the ratchet (4) being close to each other, and the side of the ratchet (4) close to the fixed clamping plate (3) being inclined.

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