Gas pipeline gas sampling mechanism

Abstract

The present application relates to a kind of gas pipeline gas sampling mechanism, it is related to gas detection technical field, it includes outer casing, the inside of the outer casing is provided with sampling assembly and spiral assembly, the sampling assembly includes sampling tube, electronic inlet sampling valve, absorber and flowmeter, temperature gauge is inserted on the flowmeter, the spiral assembly includes No. 1 rotation lever, gear, rack, tension frame and grooved wheel, the lateral surface of the grooved wheel is provided with pipe groove, the inside of the outer casing is provided with battery.The present application is cooperated by driving assembly, traction transmission structure and spiral assembly, realizes the self-adapting adjustment of the diameter of sampling tube ring, cooperates with the synchronous dragging action of single-groove guide pulley, completes the automatic expansion and contraction and regular spiral storage of sampling tube, avoids the problems of pipe body winding, bending and exposed pollution, simultaneously, equipment integration emptying pipe, optical sensor and glass observation window improve the accuracy and reliability of gas sampling detection.

Description

Technical Field

[0001] This invention relates to the field of gas detection technology, and in particular to a gas sampling mechanism for gas pipelines. Background Technology

[0002] Currently, outdoor sampling is a core preliminary step in the detection of hydrogen sulfide content in natural gas pipelines. Existing gas pipeline sampling devices mainly consist of a sampling tube, absorber, flow meter, and exposed thermometer. The gas in the pipeline is introduced into the absorber through the sampling tube, and then the flow meter and thermometer work together to monitor sampling parameters, meeting basic sampling and testing requirements. However, in actual outdoor use, these sampling devices have revealed many compatibility issues. For example, the sampling tube is a fixed-length rigid tube without a dedicated storage structure, making it susceptible to damage from impacts during outdoor transport. Furthermore, the exposed tube is prone to contamination by impurities, affecting the accuracy of subsequent tests. Additionally, the thermometers are mostly exposed and fixed, unable to be disassembled for storage, making them prone to damage during outdoor transport. External impacts can damage the equipment, reducing its lifespan. Furthermore, existing systems lack automated control for the opening and closing of sampling tubes, making manual operation cumbersome and prone to tangling and bending, affecting gas flow efficiency. The absorber's liquid level monitoring structure is rudimentary, making accurate liquid level determination difficult. Too low a level leads to insufficient absorption, while too high a level allows liquid to flow into the flow meter, causing equipment malfunction and affecting test results. Excess gas in the sampling tubes is difficult to expel quickly, leading to gas mixing and further reducing sample purity. The lack of a visual observation structure prevents staff from monitoring the absorber's operating status and instrument readings in real time, necessitating frequent disassembly and inspection, resulting in low operational efficiency.

[0003] However, there is currently no gas sampling mechanism for gas pipelines that can achieve automated storage and retraction of sampling tubes, and take into account both accurate liquid level monitoring and equipment portability. Various improvement solutions only optimize single problems and lack overall structural design. They cannot fundamentally solve a series of problems such as poor equipment portability, cumbersome operation, and easy impact on detection accuracy when sampling outdoors. They are difficult to meet the needs of efficient, accurate and convenient use of natural gas pipeline outdoor sampling. To address the aforementioned issues, this application proposes a gas sampling mechanism for gas pipelines. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a gas sampling mechanism for gas pipelines, which solves the problems of poor outdoor portability, easy contamination and entanglement of sampling tubes, and cumbersome sampling operations of existing gas sampling mechanisms for gas pipelines.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a gas sampling mechanism for a gas pipeline, comprising an outer shell, wherein a sampling component and a swirling component are disposed inside the outer shell, the sampling component comprising a sampling tube, an electronic inlet sampling valve, an absorber, and a flow meter, wherein the side surface of the electronic inlet sampling valve is fixedly connected to the outer shell, the electronic inlet sampling valve and the absorber are connected through the sampling tube, the output end of the absorber is connected to the input end of the flow meter through the sampling tube, the side surface of the absorber is fixedly connected to the outer shell, the lower surface of the flow meter is detachably connected to the outer shell, and a thermometer is inserted into the flow meter; The rotating assembly includes a first rotating rod, a gear, a rack, a tensioning frame, and a grooved wheel. Both ends of the first rotating rod are rotatably connected to the outer casing. The gear is sleeved and fixedly connected to the side surface of the first rotating rod, and the side surface of the gear meshes with the rack. The end of the rack away from the gear is fixedly connected to the tensioning frame. Both ends of the grooved wheel are rotatably connected to the tensioning frame, and the side surface of the grooved wheel is in contact with the tensioning frame. There are four racks, tensioning frames, and grooved wheels, arranged in a circular array. The side surface of the grooved wheel is provided with a tube groove, through which the sampling tube passes sequentially and is wound around the tube groove. A battery is installed inside the outer casing.

[0006] By adopting the above technical solution and setting up a rotating component, when the gear rotates, it can push the rack, and the rack can push the tensioning frame to slide linearly. The grooved wheel on the tensioning frame abuts against the sampling tube, and the diameter of the sampling tube wrapped around the grooved wheel expands or shrinks, thereby lengthening or shortening the exposed length of the sampling tube. This not only improves the portability of the entire equipment, but also allows the sampling tube to be stored when not in use to prevent contamination.

[0007] Preferably, a vent pipe is provided on the sampling tube between the electronic air intake sampling valve and the absorber, and a spiral clamp is provided in the middle of the vent pipe.

[0008] By adopting the above technical solution and setting up an venting pipe, excess gas stored in the sampling tube can be discharged in advance, thereby increasing the purity of the gas entering the absorber and making the detection results more accurate. The screw clamp is used to open and close the venting pipe.

[0009] Preferably, the inner wall of the spiral clamp is provided with optical sensors, and the number of optical sensors is three and they are linearly distributed.

[0010] By adopting the above technical solution and setting up three optical sensors, when the liquid level is between the two optical sensors at the higher height, the liquid level is at the normal liquid level. When the liquid level is lower than the optical sensor at the middle height, liquid needs to be added into the absorber. When the liquid level is lower than the optical sensor at the lowest height, the liquid level is too low, and the measurement process needs to be stopped. When the liquid level is higher than the height of the highest optical sensor, the liquid level is too high, and liquid may flow into the pipe connected to the flow meter, affecting the detection.

[0011] Preferably, the interior of the outer casing is provided with a slot, and a glass observation window is inserted into the slot.

[0012] By adopting the above technical solution and setting a glass observation window, it is convenient to observe the absorption of the absorber and the readings on the flow meter and thermometer.

[0013] Preferably, the tensioning frame is provided with limiting grooves inside, and the number of limiting grooves corresponds one-to-one with the pipe grooves and the diameters are equal.

[0014] By adopting the above technical solution and setting a limiting groove that matches the tube groove, the sampling tube will not get tangled or collide with each other when it is being put into and taken out of the tube groove, thus improving the efficiency of taking out and taking out.

[0015] Preferably, the inner wall of the outer shell is provided with linear guide rails arranged in a ring array, and the side surface of the linear guide rails is slidably connected to the tensioning frame.

[0016] By adopting the above technical solution and setting linear guide rails, the tensioning frame can only slide along the linear guide rails, thereby making the process of expanding or shrinking the diameter of the rotating component smoother and more precise.

[0017] Preferably, a drive assembly is provided inside the outer casing. The drive assembly includes a motor, a second rotating rod, and a single-groove guide wheel. The side surface of the motor is fixedly connected to the outer casing, the output end of the motor is fixedly connected to the second rotating rod, and the side surface of the second rotating rod is fixedly connected to the single-groove guide wheel.

[0018] By adopting the above technical solution and setting up a drive component, a motor drives the second rotating rod, which in turn drives the single-groove guide wheel to rotate. The single-groove guide wheel pulls the sampling tube, which is tightly attached to the inner wall of the groove, outward or inward, thereby realizing the function of extending and shortening the sampling tube.

[0019] Preferably, an anti-slip component is provided above the single-groove guide wheel. The anti-slip component includes a threaded rod, a lifting frame, a nut, and a pressing wheel. The lower end of the threaded rod is threadedly connected to the lifting frame, the two sides of the lifting frame are slidably connected to the outer casing, the lower end of the lifting frame is rotatably connected to the pressing wheel, and the upper end of the threaded rod is threadedly connected to the nut. By adopting the above technical solution and setting the anti-slip component, the rotating threaded rod pushes the lifting frame to drive the pressing wheel to move up and down, thereby causing the pressing wheel to press the side surface of the sampling tube, thus pressing the sampling tube between the single-groove guide wheel and the pressing wheel, increasing the friction and preventing slippage during the opening and closing process. After the height of the pressing wheel is adjusted, the nut is tightened to prevent the threaded rod from loosening, thus fixing the distance between the single-groove guide wheel and the pressing wheel, and fixing the pressure on the sampling tube.

[0020] Preferably, the end of the second rotating rod away from the motor is fixedly connected to the first traction sheave, the side surface of the first traction sheave is connected to a belt, the inner wall of the belt is connected to the second traction sheave, and the second traction sheave is sleeved and fixedly connected to the side surface of the first rotating rod.

[0021] By adopting the above technical solution, a first traction sheave, a belt, and a second traction sheave are set up so that when the second rotating rod rotates, it can also drive the first traction sheave to rotate. In conjunction with the belt, the second traction sheave is driven to rotate, thereby using the second traction sheave to drive the expansion and contraction of the diameter of the rotating assembly.

[0022] (III) Beneficial Effects In summary, this application includes at least one of the following beneficial technical effects: 1. A gas sampling mechanism for gas pipelines, which achieves adaptive adjustment of the sampling tube diameter by means of the linkage of the drive component, the traction transmission structure and the spiral component. With the synchronous dragging action of the single groove guide wheel, the sampling tube is automatically extended and retracted and neatly spiraled and stored. This avoids problems such as tube entanglement, bending and exposure pollution, improves the outdoor portability and ease of operation of the equipment, and ensures smooth gas flow. At the same time, the combination of the limiting groove and the tube groove makes the sampling tube retraction process smoother and more precise, further improving the stability and operating efficiency of the retraction process.

[0023] 2. A gas sampling mechanism for a gas pipeline, through the coordinated cooperation of anti-slip components and drive components, enables the extrusion wheel and single-groove guide wheel to form an adjustable clamping structure for the sampling tube, effectively increasing the friction force when the sampling tube is extended and retracted, preventing slippage and deviation, and improving the synchronization and accuracy of the extension and retraction of the sampling tube. At the same time, the device integrates an venting pipe, multiple sets of optical sensors and a glass observation window, which can also improve the purity of the sampled gas, monitor the liquid level, and monitor the operating status in real time, thereby improving the accuracy and reliability of gas sampling and detection. Attached Figure Description

[0024] Figure 1This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the outer shell of the present invention; Figure 3 This is a schematic diagram of the spiral assembly structure of the present invention; Figure 4 This is a schematic diagram of the tensioning frame structure of the present invention; Figure 5 This is a schematic diagram of the drive component structure of the present invention; Figure 6 This is a schematic diagram of the internal structure of the absorber of the present invention; Figure 7 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle; Figure 8 for Figure 2 Enlarged schematic diagram of the structure at point B.

[0025] Explanation of reference numerals in the attached figures: 1. Outer casing; 2. Sampling tube; 3. Electronic air intake sampling valve; 4. Absorber; 5. Flow meter; 6. Thermometer; 7. No. 1 rotating rod; 8. Gear; 9. Rack; 10. Tensioner; 11. Grooved wheel; 12. Tube groove; 13. Drain pipe; 14. Spiral clamp; 15. Optical sensor; 16. Slot; 17. Glass observation window; 18. Limiting groove; 19. Linear guide rail; 20. Motor; 21. No. 2 rotating rod; 22. Single groove guide wheel; 23. Threaded rod; 24. Lifting frame; 25. Nut; 26. Extrusion wheel; 27. No. 1 traction sheave; 28. Belt; 29. ​​No. 2 traction sheave; 30. Battery. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1 - Appendix Figure 8 This application will be described in further detail below.

[0027] Example: A gas sampling mechanism for a gas pipeline, referring to... Figure 1 and Figure 2The system includes an outer casing 1, inside which are a sampling assembly and a rotating assembly. The sampling assembly includes a sampling tube 2, an electronic air intake sampling valve 3, an absorber 4, and a flow meter 5. The side surface of the electronic air intake sampling valve 3 is fixedly connected to the outer casing 1. The electronic air intake sampling valve 3 and the absorber 4 are connected through the sampling tube 2. The output end of the absorber 4 is connected to the input end of the flow meter 5 through the sampling tube 2. The side surface of the absorber 4 is fixedly connected to the outer casing 1. The lower surface of the flow meter 5 is detachably connected to the outer casing 1. A thermometer 6 is inserted into the flow meter 5. The rotating assembly includes a first rotating rod 7, a gear 8, a rack 9, a tensioning frame 10, and a grooved wheel 11. Both ends of the first rotating rod 7 are rotatably connected to the outer casing 1. The gear 8 is sleeved and fixedly connected to the side surface of the first rotating rod 7. The side surface of the gear 8 meshes with the rack 9. The end of the rack 9 away from the gear 8 is fixedly connected to the tensioning frame 10. Both ends of the grooved wheel 11 are rotated with the tensioning frame 10. The device is dynamically connected. The side surface of the grooved wheel 11 fits against the tensioning frame 10. There are four racks 9, four tensioning frames 10 and four grooved wheels 11 arranged in a circular array. The side surface of the grooved wheel 11 is provided with a tube groove 12. The sampling tube 2 passes through and is wound around the tube groove 12 in sequence. The battery 30 is provided inside the outer shell 1. By setting a rotating component, when the gear 8 rotates, it can push the rack 9. The rack 9 pushes the tensioning frame 10 to slide linearly. The grooved wheel 11 on the tensioning frame 10 abuts against the sampling tube 2. The diameter of the sampling tube 2 wound around the grooved wheel 11 expands or shrinks, thereby lengthening or shortening the exposed length of the sampling tube 2. This not only improves the portability of the whole set of equipment, but also allows the sampling tube 2 to be stored when not in use to prevent contamination. The inner shell 1 is provided with a slot 16. A glass observation window 17 is inserted into the slot 16. By setting the glass observation window 17, it is convenient to observe the absorption of the absorber 4 and the readings on the flow meter 5 and the thermometer 6.

[0028] Reference Figure 2 An exhaust pipe 13 is provided on the sampling tube 2 between the electronic intake sampling valve 3 and the absorber 4. A screw clamp 14 is provided in the middle of the exhaust pipe 13. By providing the exhaust pipe 13, it is easy to discharge the excess gas stored in the sampling tube 2 in advance, so that the gas entering the absorber 4 has higher purity and the detection results are more accurate. The screw clamp 14 is used to open and close the exhaust pipe 13.

[0029] Reference Figure 6The inner wall of the spiral clamp 14 is equipped with three optical sensors 15, which are linearly distributed. By setting three optical sensors 15, when the liquid level is between the two optical sensors 15 with higher heights, the liquid level is at the normal liquid level height. When the liquid level is lower than the optical sensor 15 with the middle height, liquid needs to be filled into the absorber 4. When the liquid level is lower than the optical sensor 15 with the lowest height, the liquid level is too low and the measurement process needs to be stopped. When the liquid level is higher than the height of the highest optical sensor 15, the liquid level is too high and the liquid may flow into the pipe connected to the flow meter 5, affecting the detection.

[0030] Reference Figure 4 The tensioning frame 10 is provided with limiting grooves 18 inside. The number of limiting grooves 18 corresponds one-to-one with the tube grooves 12 and the diameter is equal. By setting limiting grooves 18 that match the tube grooves 12, the sampling tube 2 will not get tangled or collide with each other when it passes through the tube grooves 12, and the collection efficiency is higher.

[0031] Reference Figure 8 The inner wall of the outer shell 1 is provided with linear guide rails 19 arranged in a ring array. The side surface of the linear guide rails 19 is slidably connected to the tensioning frame 10. By setting the linear guide rails 19, the tensioning frame 10 can only slide along the linear guide rails 19, thereby making the process of expanding or shrinking the diameter of the spiral component smoother and more precise.

[0032] Reference Figure 2 , Figure 3 , Figure 5 and Figure 7The housing 1 contains a drive assembly, which includes a motor 20, a second rotating rod 21, and a single-groove guide wheel 22. The side surface of the motor 20 is fixedly connected to the housing 1, and the output end of the motor 20 is fixedly connected to the second rotating rod 21. The side surface of the second rotating rod 21 is fixedly connected to the single-groove guide wheel 22. By setting up the drive assembly, the motor 20 drives the second rotating rod 21, which in turn drives the single-groove guide wheel 22 to rotate. The single-groove guide wheel 22 then pushes the sampling tube 2, which is pressed against the inner wall of the groove, outward. The sampling tube 2 can be extended or shortened by dragging it inwards. An anti-slip assembly is installed above the single-groove guide wheel 22. This assembly includes a threaded rod 23, a lifting frame 24, a nut 25, and a pressing wheel 26. The lower end of the threaded rod 23 is threadedly connected to the lifting frame 24. The two sides of the lifting frame 24 are slidably connected to the outer casing 1. The lower end of the lifting frame 24 is rotatably connected to the pressing wheel 26. The upper end of the threaded rod 23 is threadedly connected to the nut 25. By using the anti-slip assembly, the rotating threaded rod 23 pushes the lifting wheel... The lowering frame 24 drives the extrusion roller 26 to move up and down, thereby causing the extrusion roller 26 to press the side surface of the sampling tube 2, which in turn presses the sampling tube 2 between the single groove guide roller 22 and the extrusion roller 26, increasing the friction and preventing slippage during the raising and lowering process. After the height of the extrusion roller 26 is adjusted, the nut 25 is tightened to prevent the threaded rod 23 from loosening, so that the distance between the single groove guide roller 22 and the extrusion roller 26 is fixed, and the pressure on the sampling tube 2 is fixed. The end of the second rotating rod 21 away from the motor 20 is fixedly connected to the first traction rod. The first traction wheel 27 is connected to the side surface of the first traction wheel 27 by a belt 28. The inner wall of the belt 28 is connected to the second traction wheel 29. The second traction wheel 29 is sleeved and fixedly connected to the side surface of the first rotating rod 7. By setting the first traction wheel 27, the belt 28 and the second traction wheel 29, the second rotating rod 21 can also drive the first traction wheel 27 to rotate when it rotates. In conjunction with the belt 28, the second traction wheel 29 is driven to rotate, thereby using the second traction wheel 29 to drive the expansion and contraction of the spiral assembly.

[0033] The implementation principle of this invention is as follows: The motor 20 is started, driving the second rotating rod 21 to rotate. The second rotating rod 21 synchronously drives the single-groove guide wheel 22 and the first traction wheel 27 to rotate. The first traction wheel 27 drives the second traction wheel 29 to rotate via the belt 28. The second traction wheel 29 then drives the first rotating rod 7 and the gear 8 fixed on its surface to rotate. The gear 8 meshes with the rack 9, driving the rack 9 to move. The rack 9 drives the tensioning frame 10 to slide linearly along the linear guide rail 19 on the inner wall of the outer shell 1. Since there are four racks 9, tensioning frame 10, and grooved wheels 11 arranged in a circular array, the sliding of the tensioning frame 10 will drive the grooved wheels 11 to move synchronously, realizing the movement of the grooved wheels 11 around the tube groove 1. The diameter of the sampling tube 2 inside the housing is adjusted, and the single-groove guide wheel 22 rotates to generate a dragging force on the sampling tube 2. In the anti-slip component above the single-groove guide wheel 22, the threaded rod 23 can be pre-rotated to push the lifting frame 24 to slide along the outer shell 1, so that the extrusion wheel 26 moves downward to cooperate with the single-groove guide wheel 22 to clamp the sampling tube 2. Then, tighten the nut 25 to lock the position of the threaded rod 23, ensuring the clamping pressure of the extrusion wheel 26 and the single-groove guide wheel 22 on the sampling tube 2, increasing the friction to prevent the sampling tube 2 from slipping when it is extended or retracted. Under the combined action of the diameter adjustment and the dragging force, the exposed length of the sampling tube 2 can be extended or shortened. After extension, the gas in the gas pipeline is introduced into the sampling tube 2 through the electronic gas inlet sampling valve 3. At this time, the vent pipe can be opened. The spiral clamp 14 on the sampling tube 2 discharges excess gas through the vent pipe 13, ensuring the purity of the gas entering the absorber 4. After the gas enters the absorber 4, three optical sensors 15 linearly distributed on the inner wall of the spiral clamp 14 continuously monitor the liquid level in the absorber 4. Normal operation occurs when the liquid level is between the two higher optical sensors 15. When the liquid level is below the middle optical sensor 15, liquid needs to be added to the absorber 4. Measurement stops when the liquid level is below the lowest optical sensor 15. When the liquid level is above the highest optical sensor 15, immediate action is needed to prevent liquid from flowing into the pipe connecting to the flow meter 5. The absorbed gas enters the flow meter 5 through the sampling tube 2. A thermometer 6 inserted on the flow meter 5 assists in... To monitor gas parameters, staff can observe the absorption status of the absorber 4 and the readings of the flow meter 5 and thermometer 6 in real time through the glass observation window 17 in the slot 16 on the outer casing 1. During the opening and closing of the sampling tube 2, the limiting grooves 18 in the tension frame 10, which correspond one-to-one with the tube groove 12 and have the same diameter, limit the sampling tube 2 to prevent it from getting tangled or colliding with each other. After the test is completed, the motor 20 rotates in the reverse direction, and the above-mentioned linkage structure drives the sampling tube 2 to retract. The groove wheel 11 neatly coils and stores the sampling tube 2, improving the portability of the equipment and preventing the sampling tube 2 from being contaminated. The flow meter 5 is detachably connected to the outer casing 1, and the thermometer 6 is inserted into the flow meter 5 for easy disassembly, storage and equipment maintenance.

[0034] The embodiments described in the specific implementations of this invention are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A gas sampling mechanism for a gas pipeline, comprising an outer casing (1), characterized in that: The outer casing (1) is equipped with a sampling assembly and a swirling assembly. The sampling assembly includes a sampling tube (2), an electronic air intake sampling valve (3), an absorber (4), and a flow meter (5). The side surface of the electronic air intake sampling valve (3) is fixedly connected to the outer casing (1). The electronic air intake sampling valve (3) and the absorber (4) are connected through the sampling tube (2). The output end of the absorber (4) is connected to the input end of the flow meter (5) through the sampling tube (2). The side surface of the absorber (4) is fixedly connected to the outer casing (1). The lower surface of the flow meter (5) is detachably connected to the outer casing (1). A thermometer (6) is inserted into the flow meter (5). The rotating assembly includes a first rotating rod (7), a gear (8), a rack (9), a tensioning frame (10), and a grooved wheel (11). Both ends of the first rotating rod (7) are rotatably connected to the outer shell (1). The gear (8) is sleeved and fixedly connected to the side surface of the first rotating rod (7). The side surface of the gear (8) is meshed with the rack (9). The end of the rack (9) away from the gear (8) is fixedly connected to the tensioning frame (10). Both ends of the grooved wheel (11) are rotatably connected to the tensioning frame (10). The side surface of the grooved wheel (11) is in contact with the tensioning frame (10). The number of the rack (9), the tensioning frame (10), and the grooved wheel (11) are four and arranged in a circular array. The side surface of the grooved wheel (11) is provided with a tube groove (12). The sampling tube (2) passes through and is wound around the tube groove (12) in sequence. A battery (30) is provided inside the outer shell (1).

2. The gas sampling mechanism for a gas pipeline according to claim 1, characterized in that: An vent pipe (13) is provided on the sampling tube (2) between the electronic air intake sampling valve (3) and the absorber (4), and a spiral clamp (14) is provided in the middle of the vent pipe (13).

3. A gas sampling mechanism for a gas pipeline according to claim 2, characterized in that: The inner wall of the spiral clamp (14) is provided with an optical sensor (15), and the number of optical sensors (15) is three and linearly distributed.

4. A gas sampling mechanism for a gas pipeline according to claim 1, characterized in that: The outer casing (1) has a slot (16) inside, and a glass observation window (17) is inserted inside the slot (16).

5. A gas sampling mechanism for a gas pipeline according to claim 1, characterized in that: The tensioning frame (10) is provided with limiting grooves (18) inside. The number of limiting grooves (18) corresponds one-to-one with the pipe grooves (12) and the diameters are equal.

6. A gas sampling mechanism for a gas pipeline according to claim 1, characterized in that: The inner wall of the outer shell (1) is provided with linear guide rails (19) arranged in a ring array, and the side surface of the linear guide rails (19) is slidably connected to the tensioning frame (10).

7. A gas sampling mechanism for a gas pipeline according to claim 1, characterized in that: The outer casing (1) is equipped with a drive assembly, which includes a motor (20), a second rotating rod (21) and a single-groove guide wheel (22). The side surface of the motor (20) is fixedly connected to the outer casing (1), the output end of the motor (20) is fixedly connected to the second rotating rod (21), and the side surface of the second rotating rod (21) is fixedly connected to the single-groove guide wheel (22).

8. A gas sampling mechanism for a gas pipeline according to claim 7, characterized in that: An anti-slip assembly is provided above the single-groove guide wheel (22). The anti-slip assembly includes a threaded rod (23), a lifting frame (24), a nut (25), and a pressing wheel (26). The lower end of the threaded rod (23) is threadedly connected to the lifting frame (24). The two sides of the lifting frame (24) are slidably connected to the outer shell (1). The lower end of the lifting frame (24) is rotatably connected to the pressing wheel (26). The upper end of the threaded rod (23) is threadedly connected to the nut (25).

9. A gas sampling mechanism for a gas pipeline according to claim 7, characterized in that: The end of the second rotating rod (21) away from the motor (20) is fixedly connected to the first traction wheel (27). The side surface of the first traction wheel (27) is connected to a belt (28). The inner wall of the belt (28) is connected to the second traction wheel (29). The second traction wheel (29) is sleeved and fixedly connected to the side surface of the first rotating rod (7).

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