Natural gas pipeline sampling device and method

Abstract

The present invention discloses a natural gas pipeline sampling device and method, which relate to the technical field of natural gas pipeline sampling. The device includes a natural gas pipeline, a sampling needle tube, a pre-sampling mechanism and a buffer pressure reducing mechanism. A mounting cylinder is vertically installed on the upper end of the natural gas pipeline, a mounting plate is horizontally installed on the inner wall of the mounting cylinder, a plurality of through-holes are opened on the mounting plate, a fixing frame is installed on the side wall of the mounting cylinder above the mounting plate, and a rubber plug is installed inside the fixing frame. The present invention utilizes a threaded rod to drive a first sealing block to move upward, so that the natural gas inside the natural gas pipeline enters the interior of the mounting cylinder above the mounting plate through the through-hole, and the second sealing block blocks the through-hole to prevent the natural gas inside the natural gas pipeline from continuing to enter the interior of the mounting cylinder above the mounting plate, and then the elastic strip is bent upward to allow the natural gas to enter the interior of the buffer cylinder, thereby realizing the pressure reduction of the natural gas inside the mounting cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas pipeline sampling, in particular to a natural gas pipeline sampling device and method. Background Art

[0002] Natural gas is a gaseous fossil fuel composed primarily of methane. It is primarily found in oil and gas fields, with smaller amounts also found in coal seams. Like crude oil, natural gas is buried underground in closed geological formations, sometimes in the same layers as crude oil, and sometimes in its own formation.

[0003] When transporting natural gas to special units, such as steel mills, it is necessary to sample the natural gas. However, the natural gas in the natural gas pipeline has a certain pressure. If the pressure is not reduced and sampling is done directly, it is easy to cause natural gas jet leakage, affecting the safety of sampling and inconvenience for users.

[0004] In view of the above problems, an improved natural gas pipeline sampling device and method are now designed. Summary of the Invention

[0005] The object of the present invention is to provide a natural gas pipeline sampling device and method to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A natural gas pipeline sampling device includes a natural gas pipeline, a sampling needle tube, a pre-sampling mechanism and a buffer pressure reducing mechanism. A mounting cylinder is vertically installed on the upper end of the natural gas pipeline. The natural gas pipeline and the mounting cylinder are communicated with each other. A mounting plate is horizontally installed on the inner wall of the mounting cylinder. A plurality of through holes are opened on the mounting plate. A fixing frame is installed on the side wall of the mounting cylinder above the mounting plate. The fixing frame and the mounting cylinder are communicated with each other. A rubber plug for sealing the fixing frame is installed inside the fixing frame. When sampling, the needle head of the sampling needle tube passes through the rubber plug and enters the interior of the mounting cylinder to sample natural gas.

[0008] The pre-sampling mechanism is arranged above the mounting plate and is used to extract the natural gas in the natural gas pipeline into the mounting cylinder above the mounting plate.

[0009] The buffering and decompression mechanism is arranged above the mounting plate and is used to buffer and decompress the natural gas extracted above the mounting plate, thereby reducing the pressure of the natural gas and improving the safety and efficiency of the sampling operation.

[0010] As a further solution of the present invention: the pre-sampling mechanism includes a first sealing block, which is slidably connected to the inner wall of the mounting cylinder above the mounting plate, and a threaded rod is rotatably connected to the center position of the upper end of the first sealing block. The upper end of the threaded rod vertically passes through the center position of the top of the mounting cylinder and is installed with a rotating disk for driving the threaded rod to rotate. The threaded rod is connected to the center position of the top of the mounting cylinder through a threaded connection, and a vent is provided at the upper end of the mounting cylinder. A temporary storage component for storing air inside the mounting cylinder above the first sealing block is provided on the vent, and a sealing component for sealing the perforation after extracting natural gas is provided at the lower end of the first sealing block.

[0011] As a further solution of the present invention: the sealing assembly includes a fixed cylinder corresponding to the perforation one by one, the fixed cylinder is vertically installed at the lower end of the first sealing block, and a third slider is slidably connected to the inner wall of the fixed cylinder, and the upper end of the third slider is installed with a tension spring for driving the third slider to move upward, the upper end of the tension spring is installed at the top of the fixed cylinder, and the lower end of the third slider is installed with a first sliding rod, and the lower end of the first sliding rod passes through the bottom of the fixed cylinder and is installed with a second sealing block for sealing the perforation, the diameter of the perforation is larger than the diameter of the fixed cylinder, and the diameter of the perforation is smaller than the diameter of the second sealing block.

[0012] As a further solution of the present invention: the temporary storage assembly includes a plurality of storage cylinders, each of which is vertically mounted on the vent hole, the storage cylinder and the mounting cylinder are connected to each other, a second slider is slidably connected to the inner wall of the storage cylinder, a second spring for pushing the second slider downward is mounted on the upper end of the second slider, and the upper end of the second spring is mounted on the top of the storage cylinder.

[0013] The function of the temporary storage component is to use the storage cylinder to store the air inside the installation cylinder above the first sealing block, to prevent the air inside the installation cylinder from exchanging with the external air, to prevent external dust and impurities from entering the interior of the installation cylinder, and to ensure the normal operation of the internal components of the installation cylinder.

[0014] As a further solution of the present invention: the buffer decompression mechanism includes a plurality of buffer cylinders, which are horizontally installed in a circular array on the side wall of the mounting cylinder above the fixed frame. The buffer cylinder and the mounting cylinder are connected to each other, and the distance between the buffer cylinder and the top of the mounting cylinder is greater than the height of the first sealing block, and the distance between the buffer cylinder and the mounting plate is greater than the length of the fixed cylinder. The purpose is to make the second sealing block seal the perforation first during the process of extracting natural gas, and then the first sealing block passes over the buffer cylinder, and the natural gas enters the interior of the buffer cylinder, thereby realizing buffer decompression of the natural gas.

[0015] The cam is secured to the chassis and has a first end secured thereto, the second end secured to the chassis having a first end secured thereto and a second end secured thereto engageing the first and second actuator members.

[0016] The function of the buffer decompression mechanism is to bend the elastic strip upward after the natural gas is extracted, so that the block releases the fixed plate. Under the action of the natural gas pressure, the first slider pushes the second slide bar and the fixed plate away from the mounting cylinder and compresses the first spring, so that the natural gas enters the interior of the buffer cylinder, thereby achieving decompression of the natural gas inside the mounting cylinder, making it easier to use the sampling needle to extract the natural gas inside the mounting cylinder, avoiding the situation where the natural gas is sprayed due to excessive pressure, and improving the safety and efficiency of the sampling operation.

[0017] As a further solution of the present invention, a handle is installed on the side wall of the rotating disk to facilitate the staff to rotate the rotating disk.

[0018] As a further solution of the present invention: reinforcing ribs for improving the structural strength of the installation tube are installed on the side walls of the installation tube.

[0019] As a further solution of the present invention: sealing rings are installed on the side walls of the first slider and the second slider.

[0020] As a further solution of the present invention: a friction bump is installed at one end of the fixing plate away from the mounting tube to facilitate workers to push the fixing plate.

[0021] A method for using a natural gas pipeline sampling device comprises the following steps:

[0022] Step 1: When taking samples, the staff rotates the rotating disk, and the rotating disk drives the threaded rod to rotate. Under the action of the thread, the threaded rod moves upward, and the threaded rod drives the first sealing block to move upward. The first sealing block extracts the natural gas inside the natural gas pipeline through the perforation to the top of the mounting plate. At the same time, due to the obstruction of the card block, the first slider will not move. The air above the first sealing block will push the second slider to move and enter the interior of the storage cylinder. At the same time, the first sealing block drives the fixed cylinder, the first sliding rod and the second sealing block to move upward. When the first sealing block approaches the buffer cylinder, the second sealing block first blocks the perforation, and then the first sealing block continues to move upward. The first sealing block drives the fixed cylinder to move, and the fixed cylinder stretches the tension spring until the first sealing block passes the buffer cylinder and moves to the top of the mounting cylinder.

[0023] Step 2: The staff bends the elastic strip upward, and the elastic strip drives the block to move upward, releasing the block's obstruction to the fixed plate. Under the action of natural gas pressure, the second slider pushes the second slide rod and the fixed plate away from the mounting cylinder and compresses the first spring, allowing the natural gas to enter the interior of the buffer cylinder, thereby achieving partial pressure of the natural gas.

[0024] Step 3: The staff inserts the needle of the sampling syringe through the rubber stopper into the interior of the mounting cylinder, and extracts the natural gas sample inside the mounting cylinder through the sampling syringe. At the same time, the staff pushes the fixed plate toward the mounting cylinder, and the fixed plate drives the second slide bar and the first slide bar to move until the fixed plate is blocked and locked by the block again, thereby realizing the sampling of natural gas.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention is provided with a pre-sampling mechanism, which uses a threaded rod to drive the first sealing block to move upward, so that the natural gas inside the natural gas pipeline enters the installation cylinder above the installation plate through the perforation. At the same time, the first sealing block drives the fixed cylinder, the first sliding rod and the second sealing block to move upward, and finally the second sealing block blocks the perforation, preventing the natural gas inside the natural gas pipeline from continuing to enter the installation cylinder above the installation plate, thereby facilitating the decompression of the extracted natural gas and improving the safety and efficiency of the sampling operation.

[0027] 2. The present invention is provided with a buffer pressure reducing mechanism. After the natural gas is extracted, the elastic strip is bent upward to release the fixing plate. Under the action of the natural gas pressure, the first slider pushes the second slide bar and the fixing plate away from the mounting cylinder and compresses the first spring, so that the natural gas enters the interior of the buffer cylinder, thereby reducing the pressure of the natural gas inside the mounting cylinder and facilitating the extraction of the natural gas inside the mounting cylinder using a sampling needle, thereby avoiding the situation where the natural gas is ejected due to excessive pressure, and improving the safety and efficiency of the sampling operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0029] Figure 2 It is a structural schematic diagram of the present invention.

[0030] Figure 3 For the present invention Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0031] Figure 4 It is a structural schematic diagram of the blocking component in the present invention.

[0032] Among them: 1. Natural gas pipeline; 2. First slide bar; 3. Fixed cylinder; 4. First sealing block; 5. Second slide bar; 6. Buffer cylinder; 7. First slider; 8. Second slider; 9. Second spring; 10. Storage cylinder; 11. Rotating disk; 12. Threaded rod; 13. Mounting cylinder; 14. Sampling needle tube; 15. Rubber plug; 16. Fixed frame; 17. Mounting plate; 18. Perforation; 19. Second sealing block; 20. First spring; 21. Fixed plate; 22. Block; 23. Elastic strip; 24. Third slider; 25. Tension spring. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] See also Figures 1-4 In an embodiment of the present invention, a natural gas pipeline sampling device includes a natural gas pipeline 1, a sampling needle tube 14, a pre-sampling mechanism and a buffer pressure reducing mechanism. A mounting cylinder 13 is vertically installed at the upper end of the natural gas pipeline 1, and the natural gas pipeline 1 and the mounting cylinder 13 are communicated with each other. A mounting plate 17 is horizontally installed on the inner wall of the mounting cylinder 13, and a plurality of through-holes 18 are opened on the mounting plate 17. A fixing frame 16 is installed on the side wall of the mounting cylinder 13 above the mounting plate 17, and the fixing frame 16 is communicated with the mounting cylinder 13. A rubber plug 15 for sealing the fixing frame 16 is installed inside the fixing frame 16. When sampling, the needle of the sampling needle tube 14 passes through the rubber plug 15 and enters the interior of the mounting cylinder 13 to sample natural gas.

[0035] The pre-sampling mechanism is disposed above the mounting plate 17 and is used to extract the natural gas in the natural gas pipeline 1 into the mounting cylinder 13 above the mounting plate 17 .

[0036] The buffer decompression mechanism is provided above the mounting plate 17 and is used to buffer and decompress the natural gas extracted above the mounting plate 17, thereby reducing the pressure of the natural gas and improving the safety and efficiency of the sampling operation.

[0037] The pre-sampling mechanism includes a first sealing block 4, which is slidably connected to the inner wall of the mounting cylinder 13 above the mounting plate 17. A threaded rod 12 is rotatably connected to the center position of the upper end of the first sealing block 4. The upper end of the threaded rod 12 vertically passes through the center position of the top of the mounting cylinder 13 and is installed with a rotating disk 11 for driving the threaded rod 12 to rotate. The threaded rod 12 is connected to the center position of the top of the mounting cylinder 13 through a thread. A vent is provided at the upper end of the mounting cylinder 13. A temporary storage component for storing air inside the mounting cylinder 13 above the first sealing block 4 is provided on the vent. A sealing component for sealing the perforation 18 after extracting natural gas is provided at the lower end of the first sealing block 4.

[0038] The sealing assembly includes a fixed cylinder 3 corresponding to the through-hole 18, and the fixed cylinder 3 is vertically installed at the lower end of the first sealing block 4. A third slider 24 is slidably connected to the inner wall of the fixed cylinder 3, and the upper end of the third slider 24 is installed with a tension spring 25 for driving the third slider 24 to move upward. The upper end of the tension spring 25 is installed at the top of the fixed cylinder 3, and the lower end of the third slider 24 is installed with a first slide rod 2. The lower end of the first slide rod 2 passes through the bottom of the fixed cylinder 3 and is installed with a second sealing block 19 for sealing the through-hole 18. The diameter of the through-hole 18 is larger than the diameter of the fixed cylinder 3, and the diameter of the through-hole 18 is smaller than the diameter of the second sealing block 19.

[0039] The function of the pre-sampling mechanism is to use the threaded rod 12 to drive the first sealing block 4 to move upward, so that the natural gas inside the natural gas pipeline 1 enters the installation cylinder 13 above the installation plate 17 through the perforation 18. At the same time, the first sealing block 4 drives the fixed cylinder 3, the first sliding rod 2 and the second sealing block 19 to move upward, and finally the second sealing block 19 blocks the perforation 18 to prevent the natural gas inside the natural gas pipeline 1 from continuing to enter the installation cylinder 13 above the installation plate 17, thereby facilitating the decompression of the extracted natural gas and improving the safety and efficiency of the sampling operation.

[0040] The temporary storage assembly includes several storage cylinders 10, which are vertically installed on the vent hole. The storage cylinder 10 is connected to the mounting cylinder 13. A second slider 8 is slidably connected to the inner wall of the storage cylinder 10. A second spring 9 for pushing the second slider 8 downward is installed at the upper end of the second slider 8. The upper end of the second spring 9 is installed on the top of the storage cylinder 10.

[0041] The function of the temporary storage component is to use the storage cylinder 10 to store the air inside the installation cylinder 13 above the first sealing block 4, to prevent the air inside the installation cylinder 13 from exchanging with the external air, to prevent external dust and impurities from entering the interior of the installation cylinder 13, and to ensure the normal operation of the internal components of the installation cylinder 13.

[0042] The buffer pressure reducing mechanism includes a plurality of buffer cylinders 6, which are horizontally mounted in a circular array on the side wall of the mounting cylinder 13 above the fixed frame 16. The buffer cylinder 6 and the mounting cylinder 13 are communicated with each other. The distance between the buffer cylinder 6 and the top of the mounting cylinder 13 is greater than the height of the first sealing block 4, and the distance between the buffer cylinder 6 and the mounting plate 17 is greater than the length of the fixed cylinder 3. The purpose is to make the second sealing block 19 seal the perforation 18 first during the process of extracting natural gas, and then the first sealing block 4 passes over the buffer cylinder 6, and the natural gas enters the interior of the buffer cylinder 6, thereby realizing buffer pressure reduction of the natural gas.

[0043] A first slider 7 is slidably connected to the inner wall of the buffer cylinder 6, and a second slide rod 5 is installed on the end of the first slide rod 7 away from the mounting cylinder 13, and a fixing plate 21 is installed on the end of the second slide rod 5 away from the first slide rod 7 through the buffer cylinder 6, and a first spring 20 is sleeved on the side wall of the second slide rod 5 for pushing the first slider 7 close to the mounting cylinder 13, and the two ends of the first spring 20 are respectively installed on the buffer cylinder 6 and the first slider 7, and an elastic strip 23 is installed on the side of the upper end of the buffer cylinder 6 away from the mounting cylinder 13, and a block 22 is installed on the lower end of the elastic strip 23 for preventing the fixing plate 21 from moving toward the side away from the mounting cylinder 13, and the block 22 is tightly attached to the end of the fixing plate 21 away from the mounting cylinder 13.

[0044] The function of the buffer decompression mechanism is to bend the elastic strip 23 upward after the natural gas is extracted, so that the block 22 releases the fixed plate 21. Under the action of the natural gas pressure, the first slider 7 pushes the second slide bar 5 and the fixed plate 21 away from the mounting cylinder 13 and compresses the first spring 20, so that the natural gas enters the interior of the buffer cylinder 6, thereby achieving decompression of the natural gas inside the mounting cylinder 13, making it easier to use the sampling needle tube 14 to extract the natural gas inside the mounting cylinder 13, avoiding the situation where the natural gas is sprayed due to excessive pressure, and improving the safety and efficiency of the sampling operation.

[0045] The above invention discloses a natural gas pipeline sampling device. During sampling, the staff rotates the rotating disk 11, and the rotating disk 11 drives the threaded rod 12 to rotate. Under the action of the thread, the threaded rod 12 moves upward, and the threaded rod 12 drives the first sealing block 4 to move upward. The first sealing block 4 extracts the natural gas inside the natural gas pipeline 1 through the perforation 18 to the top of the mounting plate 17. At the same time, due to the obstruction of the blocking block 22, the first slider 7 will not move. The air above the first sealing block 4 will push the second slider 8 to move and enter the interior of the storage cylinder 10. At the same time, the first sealing block 4 drives the fixed cylinder 3, the first slide rod 2 and the second sealing block 19 to move upward. When the first sealing block 4 approaches the buffer cylinder 6, the second sealing block 19 first blocks the perforation 18, and then the first sealing block 4 continues to move upward. The first sealing block 4 drives the fixed cylinder 3 to move, and the fixed cylinder 3 stretches the tension spring 25 until the first sealing block 4 passes the buffer cylinder 6 and moves to the top of the mounting cylinder 13.

[0046] Then the staff bends the elastic strip 23 upward, and the elastic strip 23 drives the block 22 to move upward, releasing the obstruction of the block 22 on the fixed plate 21. Under the action of natural gas pressure, the second slider 8 pushes the second slide rod 5 and the fixed plate 21 to move away from the mounting cylinder 13, and compresses the first spring 20, so that the natural gas enters the interior of the buffer cylinder 6, thereby realizing the partial pressure of the natural gas.

[0047] Then the staff inserts the needle of the sampling needle tube 14 into the interior of the mounting cylinder 13 through the rubber stopper 15, and extracts the natural gas sample inside the mounting cylinder 13 through the sampling needle tube 14. At the same time, the staff pushes the fixed plate 21 toward the mounting cylinder 13, and the fixed plate 21 drives the second slide bar 5 and the first slide block 7 to move until the fixed plate 21 is blocked and locked by the block 22 again, thereby realizing the sampling of natural gas.

[0048] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

Claims

1. A natural gas pipeline sampling device, comprising a natural gas pipeline (1), a sampling needle tube (14), a pre-sampling mechanism and a buffer pressure reducing mechanism, characterized in that: A mounting cylinder (13) is vertically mounted on the upper end of the natural gas pipeline (1), the natural gas pipeline (1) and the mounting cylinder (13) are in communication with each other, a mounting plate (17) is horizontally mounted on the inner wall of the mounting cylinder (13), a plurality of through holes (18) are provided on the mounting plate (17), a fixing frame (16) is mounted on the side wall of the mounting cylinder (13) above the mounting plate (17), the fixing frame (16) and the mounting cylinder (13) are in communication with each other, a rubber plug (15) for sealing the fixing frame (16) is mounted inside the fixing frame (16), and when sampling, the needle of the sampling needle tube (14) passes through the rubber plug (15) and enters the interior of the mounting cylinder (13) to sample natural gas; The pre-sampling mechanism is arranged above the mounting plate (17) and is used to extract natural gas from the natural gas pipeline (1) into the mounting cylinder (13) above the mounting plate (17); The buffering and decompression mechanism is arranged above the mounting plate (17) and is used to buffer and decompress the natural gas extracted above the mounting plate (17); The pre-sampling mechanism comprises a first sealing block (4), the first sealing block (4) being slidably connected to the inner wall of the mounting cylinder (13) above the mounting plate (17), a threaded rod (12) being rotatably connected to the center position of the upper end of the first sealing block (4), the upper end of the threaded rod (12) vertically passing through the center position of the top of the mounting cylinder (13) and being installed with a rotating disk (11) for driving the threaded rod (12) to rotate, the threaded rod (12) being connected to the center position of the top of the mounting cylinder (13) by a thread, the upper end of the mounting cylinder (13) being provided with an air vent, the air vent being provided with a temporary storage component for storing air inside the mounting cylinder (13) above the first sealing block (4), and the lower end of the first sealing block (4) being provided with a blocking component for blocking the perforation (18) after extracting natural gas; The blocking assembly includes a fixed cylinder (3) corresponding to the perforation (18), the fixed cylinder (3) is vertically mounted on the lower end of the first sealing block (4), a third slider (24) is slidably connected to the inner wall of the fixed cylinder (3), the upper end of the third slider (24) is mounted with a tension spring (25) for driving the third slider (24) to move upward, the upper end of the tension spring (25) is mounted on the top of the fixed cylinder (3), the lower end of the third slider (24) is mounted with a first slide bar (2), the lower end of the first slide bar (2) passes through the bottom of the fixed cylinder (3) and is mounted with a second sealing block (19) for blocking the perforation (18), the diameter of the perforation (18) is larger than the diameter of the fixed cylinder (3), and the diameter of the perforation (18) is smaller than the diameter of the second sealing block (19).

2. A natural gas pipeline sampling device according to claim 1, characterized in that: The temporary storage assembly comprises a plurality of storage cylinders (10), the storage cylinders (10) being vertically mounted on the vent hole, the storage cylinders (10) being in communication with the mounting cylinder (13), a second slider (8) being slidably connected to the inner wall of the storage cylinder (10), a second spring (9) for pushing the second slider (8) downward being mounted on the upper end of the second slider (8), and the upper end of the second spring (9) being mounted on the top of the storage cylinder (10).

3. A natural gas pipeline sampling device according to claim 2, characterized in that: The buffer decompression mechanism comprises a plurality of buffer cylinders (6), the buffer cylinders (6) being horizontally mounted in a circumferential array on the side wall of the mounting cylinder (13) above the fixed frame (16), the buffer cylinder (6) and the mounting cylinder (13) being in communication with each other, the distance between the buffer cylinder (6) and the top of the mounting cylinder (13) being greater than the height of the first sealing block (4), and the distance between the buffer cylinder (6) and the mounting plate (17) being greater than the length of the fixed cylinder (3); A first slider (7) is slidably connected to the inner wall of the buffer cylinder (6), and a second slide bar (5) is installed on the end of the first slide bar (7) away from the mounting cylinder (13). The end of the second slide bar (5) away from the first slide bar (7) passes through the buffer cylinder (6) and is installed with a fixing plate (21). A first spring (20) is sleeved on the side wall of the second slide bar (5) for pushing the first slider (7) close to the mounting cylinder (13). The two ends of the first spring (20) are respectively installed on the buffer cylinder (6) and the first slider (7). An elastic strip (23) is installed on the side of the upper end of the buffer cylinder (6) away from the mounting cylinder (13). A block (22) is installed on the lower end of the elastic strip (23) for preventing the fixing plate (21) from moving toward the side away from the mounting cylinder (13). The block (22) is tightly attached to the end of the fixing plate (21) away from the mounting cylinder (13).

4. A natural gas pipeline sampling device according to claim 1, characterized in that: A handle is mounted on the side wall of the rotating disk (11) to facilitate a worker to rotate the rotating disk (11).

5. A natural gas pipeline sampling device according to claim 1, characterized in that: Reinforcement ribs for improving the structural strength of the installation cylinder (13) are installed on the side walls of the installation cylinder (13).

6. A natural gas pipeline sampling device according to claim 3, characterized in that: Sealing rings are installed on the side walls of the first slider (7) and the second slider (8).

7. A natural gas pipeline sampling device according to claim 3, characterized in that: A friction bump is installed at one end of the fixing plate (21) away from the mounting cylinder (13) to facilitate workers to push the fixing plate (21).

8. A method for using the natural gas pipeline sampling device according to any one of claims 6 or 7, characterized in that: The following steps are involved: Step 1: When sampling, the staff rotates the rotating disk (11), and the rotating disk (11) drives the threaded rod (12) to rotate. Under the action of the thread, the threaded rod (12) moves upward, and the threaded rod (12) drives the first sealing block (4) to move upward. The first sealing block (4) draws the natural gas inside the natural gas pipeline (1) through the perforation (18) to the top of the mounting plate (17). At the same time, due to the obstruction of the block (22), the first slider (7) will not move, and the air above the first sealing block (4) will push the second slider (8) to move. The first sealing block (4) moves upward and enters the interior of the storage cylinder (10). At the same time, the first sealing block (4) drives the fixed cylinder (3), the first slide rod (2) and the second sealing block (19) to move upward. When the first sealing block (4) approaches the buffer cylinder (6), the second sealing block (19) first blocks the perforation (18). Then, the first sealing block (4) continues to move upward. The first sealing block (4) drives the fixed cylinder (3) to move. The fixed cylinder (3) stretches the tension spring (25) until the first sealing block (4) passes over the buffer cylinder (6) and moves to the top of the installation cylinder (13). Step 2: The staff bends the elastic strip (23) upwards, and the elastic strip (23) drives the block (22) to move upwards, releasing the obstruction of the block (22) on the fixed plate (21). Under the action of the natural gas pressure, the second slider (8) pushes the second slide bar (5) and the fixed plate (21) to move away from the mounting cylinder (13), and compresses the first spring (20), so that the natural gas enters the interior of the buffer cylinder (6), thereby realizing the partial pressure of the natural gas; Step 3: The staff inserts the needle of the sampling needle tube (14) through the rubber stopper (15) into the interior of the installation cylinder (13), and extracts the natural gas sample inside the installation cylinder (13) through the sampling needle tube (14). At the same time, the staff pushes the fixed plate (21) toward the installation cylinder (13), and the fixed plate (21) drives the second slide bar (5) and the first slide block (7) to move until the fixed plate (21) is blocked and locked by the block (22) again, thereby realizing the sampling of natural gas.

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