A natural gas sampling system

Abstract

The present invention relates to the technical field of natural gas sampling, and specifically to a natural gas sampling system, comprising a delivery pipeline, wherein a sampling positioning cylinder is fixedly arranged on the delivery pipeline, and matching positioning plates are symmetrically fixedly arranged at both ends of the sampling positioning cylinder, a connecting positioning groove is provided on the matching positioning plate, and plug-in locking grooves are symmetrically provided on both sides of the matching positioning plate, and a matching inner supporting plate is fixedly arranged inside the sampling positioning cylinder. When sampling natural gas, sampling can be carried out from the inside of the delivery pipeline, thereby ensuring the accuracy of the sampling detection results. At the same time, when sampling, the sampling cylinder and the delivery pipeline can be directly and quickly connected without complicated installation operations, which is convenient for the staff and also improves the sampling work efficiency. The sampling operation is simple, and only the matching driving plate needs to be pushed down to achieve quick sampling.

Description

Technical Field

[0001] The invention relates to the technical field of natural gas sampling, in particular to a natural gas sampling system. Background Art

[0002] In order to understand the composition and purity of natural gas during the extraction process, it is necessary to sample and test the natural gas. When sampling, the sampling device needs to be connected to the sampling port on the natural gas transmission pipeline for sampling, and the valve is opened to allow the natural gas to enter the sampling device through the sampling port. This traditional sampling method has a certain adverse effect on the detection of natural gas, because the absorption or adsorption of the inner wall of the natural gas pipeline will cause a memory effect. When the actual concentration of the fluid decreases, desorption will occur again, causing the composition of the sample to change, especially when analyzing trace components (such as trace water, oxygen, carbon monoxide, acetylene, etc.). The effect is particularly significant. Therefore, it is impossible to extend into the interior of the natural gas pipeline for sampling, resulting in a greater impact on the detection results of natural gas, making the accuracy of the detection of trace components low. In addition, when sampling, the sampling device cannot be quickly and conveniently connected to the transmission pipeline, which affects the sampling efficiency and makes the operation of the staff more troublesome. Summary of the invention

[0003] The object of the present invention is to provide a natural gas sampling system to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A natural gas sampling system comprises a delivery pipeline, wherein a sampling positioning cylinder is fixedly arranged on the delivery pipeline, and matching positioning plates are symmetrically fixedly arranged at both ends of the sampling positioning cylinder, a connecting positioning groove is provided on the matching positioning plate, and plug-in locking grooves are symmetrically provided on both sides of the matching positioning plate, a matching inner support plate is fixedly arranged inside the sampling positioning cylinder, an extended inner insert cylinder is fixedly arranged on the matching inner support plate, the extended inner insert cylinder is plugged into the interior of the delivery pipeline, and a sealing plug-in ring groove is provided on the matching inner support plate, and the upper tube mouth of the extended inner insert cylinder is located on the inner side of the sealing plug-in ring groove, and a sealing ring cavity for installing is provided at the lower end of the extended inner insert cylinder, and a sealing ring cavity for installing is symmetrically fixedly arranged on the lower end surface of the matching inner support plate There is a matching support carrier rod, which is located inside the conveying pipeline, and a closed fitting plate is installed at the lower end of the extended inner insert tube, and a sealing matching tube is fixedly arranged on the closed fitting plate, and the upper end surface of the closed fitting plate contacts the lower end surface of the extended inner insert tube, and the sealing matching tube is inserted in the installation sealing ring cavity, and a sampling connecting hole is provided on the sealing matching tube, and support matching plates are symmetrically fixed at both ends of the closed fitting plate, and support matching connecting holes are provided on the support matching plate, and a matching support carrier rod is inserted in the support matching connecting hole, and a first matching spring is sleeved on the matching support carrier rod, and when natural gas sampling is performed, an insertable convenient sampling mechanism is installed on the conveying pipeline.

[0006] Preferably, the insertable convenient sampling mechanism includes a sampling barrel, a matching drive plate, a connecting movable plate and a matching movable plate, a sealing ring sleeve is fixedly provided at the lower end of the sampling barrel, and the sampling barrel is partially inserted into the sampling positioning barrel when sampling, and the sealing ring sleeve is inserted into the sealing plug-in ring groove.

[0007] Preferably, a sampling tube is fixedly arranged on the inner side of the sealing ring sleeve, the sampling tube is connected with the sampling barrel, and a conical matching channel is opened at the lower end of the sampling tube, a connecting movable hole is opened at the upper end of the sampling barrel, and matching carrier plates are symmetrically fixedly arranged at both ends of the upper side of the sampling barrel.

[0008] Preferably, a positioning bearing column is fixedly provided on the matching carrier plate, a limited position channel is provided on the positioning bearing column, and supporting bearing blocks are symmetrically fixedly provided on both sides of the positioning bearing column, and a matching bearing rod is fixedly provided on the supporting bearing block.

[0009] Preferably, a matching drive plate is installed on the sampling tube, a fixed bearing column is fixedly provided on the upper end of the matching drive plate, a supporting matching rod is fixedly provided on the upper end of the fixed bearing column, a limiting top plate is fixedly provided on the upper end of the supporting matching rod, and installation inner grooves are symmetrically provided at both ends of the matching drive plate, and a limited position socket is provided in the installation inner groove.

[0010] Preferably, a load-bearing inner plug rod is fixedly provided at the lower end of the mating driving plate, and the load-bearing inner plug rod passes through the connecting movable hole and is inserted into the interior of the sampling barrel, and a second mating spring is sleeved on the load-bearing inner plug rod, and a mating inner plug plate is fixedly provided on the load-bearing inner plug rod, and the mating inner plug plate is inserted into the sampling barrel, and a conical sealing block is also fixedly provided at the lower end of the load-bearing inner plug rod, and the conical sealing block is inserted in the conical mating channel.

[0011] Preferably, plug-in connecting rods are symmetrically fixedly provided at both ends of the lower side of the mating driving plate, the plug-in connecting rods are inserted in the limiting channel, and a mating connecting bottom block is fixedly provided at the lower end of the plug-in connecting rod, and a mating connecting rod is hinged on the mating connecting bottom block.

[0012] Preferably, a connecting movable plate is installed on the mating driving plate, a socket socket is opened on the connecting movable plate, a supporting matching rod is inserted in the socket socket, and connecting movable rods are symmetrically hinged at both ends of the connecting movable plate, and a limiting matching block is hinged at the lower end of the connecting movable rod.

[0013] Preferably, the limiting fitting block is inserted in the installation inner groove, and a protruding connecting block is fixedly provided on the limiting fitting block, a connecting movable rod is hinged on the protruding connecting block, and a limiting plug-in rod is also fixedly provided on the limiting fitting block, and the limiting plug-in rod is inserted in the limiting socket.

[0014] Preferably, matching movable plates are symmetrically installed at both ends of the sampling tube, a limiting plug-in channel is opened on the matching movable plate, a connecting base plate is fixedly arranged on the lower side of the limiting plug-in channel, sliding matching holes are symmetrically opened at both ends of the connecting base plate, matching carrier rods are inserted in the sliding matching holes, and a hanging connecting block is fixedly arranged at the lower end of the connecting base plate, a matching positioning carrier plate is fixedly arranged at the lower end of the hanging connecting block, matching positioning strips are symmetrically fixedly arranged on both sides of the matching positioning carrier plate, and the matching positioning carrier plate is hinged to the connecting matching connecting rod.

[0015] Compared with the prior art, the invention has the following advantages:

[0016] 1. When sampling natural gas, sampling can be carried out from the inside of the transmission pipeline, ensuring the accuracy of the sampling test results. At the same time, the sampling tube can be directly and quickly connected to the transmission pipeline during sampling, without the need for complicated installation operations, which is convenient for the staff and also improves the sampling efficiency. The sampling operation is simple, and only needs to push down the drive plate to achieve rapid sampling.

[0017] 2. A closed fitting plate is provided inside the conveying pipeline, which can seal the extended inner insert tube and ensure the sealing of the conveying pipeline when no sampling is taken. When sampling is performed, the sampling tube is inserted into the extended inner insert tube to contact the closed fitting plate, and the sealing ring sleeve is inserted into the sealing plug-in ring groove to ensure the sealing during the sampling process. Then, the matching drive plate is pushed downward to drive the closed fitting plate to move downward, so that the sampling connection hole is exposed inside the conveying pipeline, thereby realizing sampling. After the sampling is completed, the matching drive plate is released to realize the automatic closure of the conveying pipeline. At the same time, a certain negative pressure will be generated inside the sampling tube, which can absorb the natural gas retained in the extended inner insert tube to avoid leakage of natural gas.

[0018] 3. In addition, when the matching drive plate is pushed during sampling, the matching movable plate can be driven to move so that the matching positioning strip can be inserted into the plug-in locking groove, thereby realizing a fixed connection between the sampling tube and the conveying pipeline, ensuring stability during sampling. At the same time, under the action of the matching movable plate, the matching drive plate can be automatically locked, ensuring the firmness of the connection between the sampling tube and the conveying pipeline. After the sampling is completed, the matching drive plate can be unlocked by pulling up the connecting movable plate, thereby unlocking the sampling tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the assembly of the delivery pipeline and the sampling tube.

[0020] Figure 2 for Figure 1 A magnified schematic diagram of center A.

[0021] Figure 3 This is a schematic diagram of the structure of the transmission pipeline.

[0022] Figure 4 Schematic diagram of the internal structure of the transmission pipeline.

[0023] Figure 5 It is a schematic diagram of the structure of a closed laminated board.

[0024] Figure 6 This is a schematic diagram of the assembly of the sampling tube.

[0025] Figure 7 This is a schematic diagram of the half-section structure of the sampling tube.

[0026] Figure 8 To match the structural diagram of the driver board.

[0027] In the figure: 1. conveying pipeline; 11. sampling positioning cylinder; 12. matching positioning plate; 13. connecting positioning groove; 14. plug-in locking groove; 15. matching inner bearing plate; 16. extending inner insert cylinder; 17. sealing plug-in ring groove; 18. installing sealing ring cavity; 19. matching supporting rod; 2. closing fitting plate; 21. sealing matching cylinder; 22. sampling connecting hole; 23. supporting matching plate; 24. supporting matching connecting hole; 25. first matching spring; 3. sampling cylinder; 31. sealing ring sleeve; 32. extending into sampling tube; 33. conical matching channel; 34. connecting movable hole; 35. matching carrier plate; 36. positioning bearing column; 37. limiting channel; 38. supporting carrier block; 39. matching carrier rod; 4. Matching drive plate; 41. Fixed bearing column; 42. Support matching rod; 43. Limiting top plate; 44. Installing inner groove; 45. Limiting plug hole; 46. Bearing inner plug rod; 461. Second matching spring; 47. Matching inner plug plate; 48. Conical blocking block; 49. Connecting connecting rod; 491. Matching connecting bottom block; 492. Connecting matching connecting rod; 5. Connecting movable plate; 51. Sleeve plug hole; 52. Connecting movable rod; 53. Limiting matching block; 54. Protruding connecting block; 55. Limiting plug rod; 6. Matching movable plate; 61. Limiting plug-in channel; 62. Connecting bottom plate; 63. Sliding matching hole; 64. Drooping connecting block; 65. Matching positioning carrier plate; 66. Matching positioning insert strip. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0029] See also Figures 1 to 8 , the present invention provides a technical solution:

[0030] A natural gas sampling system includes a delivery pipeline 1, on which a sampling positioning cylinder 11 is fixedly provided, and matching positioning plates 12 are symmetrically fixedly provided at both ends of the sampling positioning cylinder 11, and a connecting positioning groove 13 is provided on the matching positioning plate 12, and plug-in locking grooves 14 are symmetrically provided on both sides of the matching positioning plate 12, and a matching inner support plate 15 is fixedly provided inside the sampling positioning cylinder 11, and an extended inner insert cylinder 16 is fixedly provided on the matching inner support plate 15, and the extended inner insert cylinder 16 is plugged into the interior of the delivery pipeline 1, and a sealing plug-in ring groove 17 is provided on the matching inner support plate 15, and the upper tube mouth of the extended inner insert cylinder 16 is located on the inner side of the sealing plug-in ring groove 17, and the lower end of the extended inner insert cylinder 16 is provided with a mounting sealing ring cavity 18, and a matching support carrier rod 19 is symmetrically fixedly provided on the lower end surface of the matching inner support plate 15, and the matching support carrier rod 19 is located in Inside the conveying pipeline 1, a closed fitting plate 2 is installed at the lower end of the extended inner insert tube 16, and a sealing matching tube 21 is fixedly arranged on the closed fitting plate 2. The upper end surface of the closed fitting plate 2 contacts the lower end surface of the extended inner insert tube 16. The sealing matching tube 21 is inserted in the installation sealing ring cavity 18 to play a sealing role, and a sampling connecting hole 22 is provided on the sealing matching tube 21. Support matching plates 23 are symmetrically fixed at both ends of the closed fitting plate 2. Support matching connecting holes 24 are provided on the support matching plates 23. A matching support rod 19 is inserted in the support matching connecting hole 24. A first matching spring 25 is sleeved on the matching support rod 19, and the two ends of the first matching spring 25 are respectively welded on the lower end surface of the matching inner support plate 15 and the supporting matching plate 23. When sampling natural gas, an insertable convenient sampling mechanism is installed on the conveying pipeline 1.

[0031] The insertable convenient sampling mechanism includes a sampling tube 3, a matching driving plate 4, a connecting movable plate 5 and a matching movable plate 6. A sealing ring sleeve 31 is fixedly provided at the lower end of the sampling tube 3, and the sampling tube 3 is partially inserted into the sampling positioning tube 11 during sampling, and the sealing ring sleeve 31 is inserted into the sealing plug-in ring groove 17 to further ensure the sealing during sampling.

[0032] A sampling tube 32 is fixedly arranged on the inner side of the sealing ring sleeve 31. The sampling tube 32 is connected to the sampling barrel 3, and a conical matching channel 33 is provided at the lower end of the sampling tube 32. A connecting movable hole 34 is provided at the upper end of the sampling barrel 3, and matching carrier plates 35 are symmetrically fixedly arranged at both ends of the upper side of the sampling barrel 3. In addition, the outer diameter of the sampling tube 32 is equal to the inner diameter of the extended inner insert barrel 16.

[0033] A positioning bearing column 36 is fixedly provided on the matching carrier plate 35, a limiting channel 37 is provided on the positioning bearing column 36, and supporting blocks 38 are symmetrically fixedly provided on both sides of the positioning bearing column 36, and a matching carrying rod 39 is fixedly provided on the supporting blocks 38. In addition, when sampling is performed, the positioning bearing column 36 is inserted into the connecting positioning groove 13 and contacts with the inner wall of the connecting positioning groove 13, so as to position the sampling tube 3.

[0034] A matching drive plate 4 is installed on the sampling tube 3, and a fixed bearing column 41 is fixedly provided on the upper end of the matching drive plate 4, a supporting matching rod 42 is fixedly provided on the upper end of the fixed bearing column 41, and a limiting top plate 43 is fixedly provided on the upper end of the supporting matching rod 42, and installation inner grooves 44 are symmetrically opened at both ends of the matching drive plate 4, and a limited position plug hole 45 is opened in the installation inner groove 44.

[0035] A load-bearing inner plug rod 46 is fixedly provided at the lower end of the matching driving plate 4, and the load-bearing inner plug rod 46 passes through the connecting movable hole 34 and is inserted into the interior of the sampling tube 3, and a second matching spring 461 is sleeved on the load-bearing inner plug rod 46, and the second matching spring 461 is located on the outside of the sampling tube 3, and the two ends of the second matching spring 461 are respectively welded to the matching driving plate 4 and the sampling tube 3, and a matching inner plug plate 47 is fixedly provided on the load-bearing inner plug rod 46, and the matching inner plug plate 47 is inserted in the sampling tube 3, and the diameter of the matching inner plug plate 47 is equal to the inner diameter of the sampling tube 3, and a conical blocking block 48 is also fixedly provided at the lower end of the load-bearing inner plug rod 46, and the conical blocking block 48 is inserted in the conical matching channel 33. With the cooperation of the conical surface, the sealing performance of the sampling tube 32 can be fully guaranteed. In addition, the diameter of the load-bearing inner plug rod 46 is smaller than the inner diameter of the sampling tube 32.

[0036] The two ends of the lower side of the mating driving plate 4 are symmetrically fixed with plug-in connecting rods 49, which are inserted into the limiting channel 37, and the lower end of the plug-in connecting rod 49 is fixed with a mating connecting bottom block 491, on which a connecting mating connecting rod 492 is hinged.

[0037] A connecting movable plate 5 is installed on the matching driving plate 4, and a socket socket 51 is opened on the connecting movable plate 5. A supporting matching rod 42 is inserted in the socket socket 51, and connecting movable rods 52 are symmetrically hinged at both ends of the connecting movable plate 5, and a limiting matching block 53 is hinged at the lower end of the connecting movable rod 52.

[0038] The limiting fitting block 53 is inserted in the installation inner groove 44 , and a protruding connecting block 54 is fixedly provided on the limiting fitting block 53 , a connecting movable rod 52 is hinged on the protruding connecting block 54 , and a limiting plug-in rod 55 is also fixedly provided on the limiting fitting block 53 , and the limiting plug-in rod 55 is inserted in the limiting plug hole 45 .

[0039] The two ends of the sampling tube 3 are symmetrically equipped with matching movable plates 6, and a limiting plug-in channel 61 is provided on the matching movable plate 6. A connecting bottom plate 62 is fixedly provided on the lower side of the limiting plug-in channel 61. Sliding matching holes 63 are symmetrically provided at both ends of the connecting bottom plate 62. A matching carrier rod 39 is inserted in the sliding matching hole 63, and a hanging connecting block 64 is fixedly provided at the lower end of the connecting bottom plate 62. A matching positioning carrier plate 65 is fixedly provided at the lower end of the hanging connecting block 64. Matching positioning inserts 66 are symmetrically fixedly provided on both sides of the matching positioning carrier plate 65, and the matching positioning inserts 66 are inserted in the plug-in locking groove 14 when they play a role in fixing the sampling tube 3, and the matching positioning carrier plate 65 is hinged with the connecting matching connecting rod 492. In addition, the height of one end of the connecting matching connecting rod 492 hinged to the matching positioning carrier plate 65 is higher than the height of one end thereof hinged to the matching connecting bottom block 491.

[0040] When sampling natural gas, the extended sampling tube 32 is inserted into the extended inner insert tube 16 so that its lower end face contacts the upper end face of the closed fitting plate 2. At this time, the lower end face of the conical sealing block 48 also contacts the closed fitting plate 2. At the same time, the sealing ring sleeve 31 is inserted into the sealing insert ring groove 17 to further ensure the sealing during sampling. The positioning bearing column 36 is inserted into the connecting positioning groove 13 to realize the positioning of the sampling tube 3. Pressing the matching drive plate 4 downward can drive the conical sealing block 48 to move downward, and at the same time drive the closed fitting plate 2 to move downward. As the conical sealing block 48 moves, the conical matching channel 33 will be opened. At the same time, as the closed fitting plate 2 moves, the sampling connection hole 22 on the sealed matching tube 21 will be moved out of the installation. The sealing ring cavity 18 is formed so that the natural gas in the conveying pipeline 1 can enter the extended inner insert cylinder 16 from the sampling connection hole 22, and then enter the sampling cylinder 3 from the tapered matching channel 33, that is, insert sampling is realized, and the sampling quality is guaranteed. In addition, when the matching driving plate 4 moves downward, it will also drive the plug-in connecting rod 49 to move downward, so that under the action of the connecting matching connecting rod 492, the matching movable plate 6 will be driven to move in the direction of the sampling cylinder 3, so that the matching positioning insert strip 66 is plugged into the plug-in locking groove 14, realizing the fixed connection between the sampling cylinder 3 and the conveying pipeline 1, thereby ensuring the stability of the sampling cylinder 3 during the sampling process, and as the matching movable plate 6 moves, it will contact the limiting matching block 53, so that when the matching movable plate 6 Under the action of the limiting matching block 53, the limiting matching block 53 will be pushed to move in the direction of the supporting matching rod 42. In this way, under the action of the connecting movable rod 52, the connecting movable plate 5 will be pushed to move upward relative to the matching driving plate 4 until the limiting matching block 53 reaches the limiting plug-in channel 61. In this way, under the action of gravity, the connecting movable plate 5 moves downward, and then under the action of the connecting movable rod 52, the limiting matching block 53 is pushed to move in the opposite direction and plugged into the limiting plug-in channel 61. Under the action of the top wall in the limiting plug-in channel 61, the limiting matching block 53 cannot move upward, thereby realizing the fixation of the matching driving plate 4, ensuring the reliability of the installation of the sampling tube 3. After the sampling is completed, the connecting movable plate 5 is pulled upward to make the limiting matching block 53 withdraw from the limiting plug-in channel 61. That is, the mating driving plate 4 is in an unlocked state, and then moves upward under the action of the second mating spring 461, thereby resetting the conical blocking block 48, and at the same time, the closed fitting plate 2 is reset under the action of the first mating spring 25. During the resetting process, when the sampling connection hole 22 is inside the installation sealing ring cavity 18, a certain amount of natural gas will remain in the extended inner insert tube 16, and the conical blocking block 48 is not completely reset at this time. With the movement of the conical blocking block 48, the mating inner plug plate 47 will also move upward, so that a certain negative pressure can be formed inside the sampling tube 3. Under the action of the negative pressure, the natural gas retained in the extended inner insert tube 16 can be absorbed into the interior of the sampling tube 3 to avoid leakage of natural gas.After the driving plate 4 is completely reset, the sampling tube 3 can be removed. When the sample in the sampling tube 3 needs to be taken out, the driving plate 4 is pushed to make the extended sampling tube 32 open. At the same time, the natural gas can be discharged more easily under the push of the plug plate 47. In addition, when the sample in the sampling tube 3 is difficult to be completely taken out, a vacuum pump can be used to extract it.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A natural gas sampling system, comprising a delivery pipeline (1), characterized in that: The delivery pipeline (1) is fixedly provided with a sampling positioning cylinder (11), and matching positioning plates (12) are symmetrically fixedly provided at both ends of the sampling positioning cylinder (11), and a connecting positioning groove (13) is provided on the matching positioning plate (12), and plug-in locking grooves (14) are symmetrically provided on both sides of the matching positioning plate (12), and a matching inner support plate (15) is fixedly provided inside the sampling positioning cylinder (11), and an extended inner insert cylinder (16) is fixedly provided on the matching inner support plate (15), and the extended inner insert cylinder (16) is plugged into the interior of the delivery pipeline (1), and a sealing plug-in ring groove (17) is provided on the matching inner support plate (15), and the upper cylinder mouth of the extended inner insert cylinder (16) is located on the inner side of the sealing plug-in ring groove (17), and The lower end of the extended inner insert tube (16) is provided with a mounting seal ring cavity (18), and a matching support rod (19) is symmetrically fixedly arranged on the lower end surface of the matching inner support plate (15), and the matching support rod (19) is located inside the conveying pipeline (1). The lower end of the extended inner insert tube (16) is provided with a closed fitting plate (2), and a sealing matching tube (21) is fixedly arranged on the closed fitting plate (2), and the upper end surface of the closed fitting plate (2) is in contact with the lower end surface of the extended inner insert tube (16). The sealing matching tube (21) is inserted into the mounting seal ring cavity (18), and a sampling connection hole (22) is provided on the sealing matching tube (21). The supporting matching plates (21) are symmetrically fixedly arranged at both ends of the closed fitting plate (2). 3), a supporting matching connecting hole (24) is provided on the supporting matching connecting hole (24), a matching supporting rod (19) is inserted into the supporting matching connecting hole (24), a first matching spring (25) is sleeved on the matching supporting rod (19), when natural gas sampling is performed, an insert-type convenient sampling mechanism is installed on the transmission pipeline (1), the insert-type convenient sampling mechanism comprises a sampling barrel (3), a matching driving plate (4), a connecting movable plate (5) and a matching movable plate (6), a sealing ring sleeve (31) is fixedly provided at the lower end of the sampling barrel (3), and the sampling barrel (3) is partially inserted into the sampling positioning barrel (11) when sampling is performed, the sealing ring sleeve (31) is inserted into the sealing insert ring groove (17), and the sealing ring sleeve (3 1), a sampling tube (32) is fixedly arranged on the inner side of the sampling tube (3), the sampling tube (32) is connected with the sampling tube (3), and a conical matching channel (33) is provided at the lower end of the sampling tube (32), a connecting movable hole (34) is provided at the upper end of the sampling tube (3), and matching carrier plates (35) are symmetrically fixedly arranged at both ends of the upper side of the sampling tube (3), a positioning bearing column (36) is fixedly arranged on the matching carrier plate (35), a limiting channel (37) is provided on the positioning bearing column (36), and support blocks (38) are symmetrically fixedly arranged on both sides of the positioning bearing column (36), and a matching carrier rod (39) is fixedly arranged on the supporting block (38), and a matching drive plate (4) is installed on the sampling tube (3),A fixed bearing column (41) is fixedly provided at the upper end of the matching drive plate (4), a supporting matching rod (42) is fixedly provided at the upper end of the fixed bearing column (41), a limiting top plate (43) is fixedly provided at the upper end of the supporting matching rod (42), and mounting inner grooves (44) are symmetrically provided at both ends of the matching drive plate (4), a limiting insertion hole (45) is provided in the mounting inner groove (44), and a bearing inner insertion rod (46) is fixedly provided at the lower end of the matching drive plate (4), the bearing inner insertion rod (46) passes through the connecting movable hole (34) and is inserted into the interior of the sampling tube (3), and the bearing inner insertion rod (46) is fixedly provided at the lower end of the matching drive plate (4), and the bearing inner insertion rod (46) passes through the connecting movable hole (34) and is inserted into the interior of the sampling tube (3), and the bearing inner insertion rod (46) is fixedly provided at the upper end of the matching drive plate (4), and the bearing inner insertion rod (46) is fixedly provided at the upper end of the matching drive plate (4), and the bearing inner insertion rod (46) passes through the connecting movable hole (34) and is inserted into the interior of the sampling tube (3), and the bearing inner insertion rod (43 ...3) is fixedly provided at the upper end of the matching drive plate (4), and the bearing inner insertion rod (43) is fixedly provided at the upper end of the matching drive plate (4), and the bearing inner insertion rod (43) is fixedly provided at the upper end of the matching drive plate (4), and the A second matching spring (461) is sleeved on the rod (46), a matching inner plug plate (47) is fixedly arranged on the load-bearing inner plug rod (46), the matching inner plug plate (47) is plugged into the sampling tube (3), and a conical blocking block (48) is fixedly arranged at the lower end of the load-bearing inner plug rod (46), the conical blocking block (48) is plugged into the conical matching channel (33), and plug-in connecting rods (49) are symmetrically fixedly arranged at both ends of the lower side of the matching drive plate (4), the plug-in connecting rods (49) are plugged into the limiting channel (37), and a matching connecting bottom block (48) is fixedly arranged at the lower end of the plug-in connecting rod (49). 491), a connecting connecting rod (492) is hingedly connected to the matching connecting bottom block (491), a connecting movable plate (5) is installed on the matching driving plate (4), a sleeve plug hole (51) is provided on the connecting movable plate (5), a supporting matching rod (42) is inserted into the sleeve plug hole (51), and connecting movable rods (52) are symmetrically hingedly connected at both ends of the connecting movable plate (5), and a limiting matching block (53) is hingedly connected at the lower end of the connecting movable rod (52), and matching movable plates (6) are symmetrically installed at both ends of the sampling tube (3), and a limiting plug-in passage is provided on the matching movable plate (6). A connecting bottom plate (62) is fixedly provided on the lower side of the limiting insertion channel (61), and sliding matching holes (63) are symmetrically provided at both ends of the connecting bottom plate (62), and matching carrier rods (39) are inserted into the sliding matching holes (63), and a hanging connecting block (64) is fixedly provided at the lower end of the connecting bottom plate (62), and a matching positioning carrier plate (65) is fixedly provided at the lower end of the hanging connecting block (64), and matching positioning insert strips (66) are symmetrically fixedly provided on both sides of the matching positioning carrier plate (65), and the matching positioning carrier plate (65) is hingedly connected to the connecting matching connecting rod (492).

2. A natural gas sampling system according to claim 1, characterized in that: The limiting matching block (53) is inserted into the mounting inner groove (44), and a protruding connecting block (54) is fixedly provided on the limiting matching block (53), a connecting movable rod (52) is hingedly connected to the protruding connecting block (54), and a limiting plug-in rod (55) is also fixedly provided on the limiting matching block (53), and the limiting plug-in rod (55) is inserted into the limiting plug hole (45).

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