A tower gas sampling device

Abstract

The invention relates to the technical field of tower gas sampling, and discloses a tower gas sampling device, comprising a leakproof shell, wherein the bottom of the leakproof shell is fixedly connected with an anti-leakage mechanism, the left side of the leakproof shell is fixedly connected with a sampling mechanism, and the top of the leakproof shell is fixedly connected with an inflation valve. According to the invention, the gas in a sampling tube is filled into the leakproof shell, so that the air pressure in the leakproof shell is greater than the air pressure in the tower, thereby filling the leakproof shell with the gas in the tower, and when the arc rod is released, under the action of the air pressure in the leakproof shell, the sampling plug is pushed back to the side of the sampling tube away from the leakproof shell, and the sampling tube is filled with the gas in the tower. At this time, the clamping rod is held so that one end of the clamping rod close to the sampling plug is close to each other, so that the clamping rod and the clamping pin can be separated, and the sampling tube can be pulled out of the tube to achieve the purpose of sampling. The sampling is performed in a closed environment during the whole process, and a good anti-leakage purpose can be achieved.

Description

Technical Field

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

[0002] A tower is a device used to carry out physical processes such as separation or absorption, or to change the composition of a complex mixture of gas or liquid. It is also called "tower equipment". The height-to-diameter ratio is large, and certain accessories are installed inside and outside the tower. The internal parts are used to make the gas and liquid, gas and solid, liquid and liquid, or liquid and solid in the material come into close contact, and the surface is constantly renewed to complete the process of mass transfer (usually accompanied by heat transfer).

[0003] Patent website publication number CN 114383902 A discloses a tower gas sampling device and a tower. The tower gas sampling device comprises a sampling gun (1), a sampling tube (2), a pump (4) and an alkali solution absorber (5). The head of the sampling gun (1) extends into the tower through a side hole provided on the tower wall. The tail of the sampling gun (1) is connected to one end of the sampling tube (2). The other end of the sampling tube (2) passes through the pump (4) and enters the alkali solution in the alkali solution absorber (5). The pump (4) is configured to extract gas from the tower. The tower gas sampling device has little impact on the existing system when in use. The sampling analysis is convenient and effective, thereby ensuring the efficient operation of the tower.

[0004] The above-mentioned method is to extend the head of the sampling gun into the interior of the tower through the side hole opened on the tower wall, the tail of the sampling gun is connected with one end of the sampling tube, and the other end of the sampling tube is passed into the alkali solution in the alkali solution absorber after passing through the pump. The pump is configured to extract the gas in the tower, which may easily lead to leakage of the gas in the tower, thereby causing personal injury.

[0005] Therefore, it is necessary to design a tower gas sampling device that is practical and leak-proof. Summary of the invention

[0006] The object of the present invention is to provide a tower gas sampling device to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a tower gas sampling device comprises a leakproof shell, a leakproof mechanism is fixedly connected to the bottom of the leakproof shell, a sampling mechanism is fixedly connected to the left side of the leakproof shell, and an inflation valve is fixedly connected to the top of the leakproof shell;

[0008] The sampling mechanism comprises a placement tube, a sampling tube is inserted in the placement tube, a sampling plug is interference fit in the sampling tube, a pressure rod is fixedly connected in the middle of the sampling plug, an arc rod is fixedly connected at one end of the pressure rod away from the sampling plug, a clamping rod is hinged at the side of the sampling tube away from the leak-proof shell, a clamping pin is clamped at the side of the clamping rod close to the placement tube, and the sampling tube is fixedly connected at both ends of the clamping pin;

[0009] The anti-leakage mechanism includes a second limiting ring, which is fixedly connected to the bottom of the leakage-proof shell, a first spring is fixedly connected to the top of the limiting ring, a plug is fixedly connected to the top of the first spring, an anti-leakage ring seat is fixedly connected to the corresponding plug in the leakage-proof shell, and a first sealing ring and a second sealing ring are arranged in sequence from top to bottom in the anti-leakage ring seat.

[0010] According to the above technical solution, a second sealing groove is opened in the middle of the sampling tube, a sealing ring is fixedly connected to the sampling tube in the second sealing groove, a first sealing groove is opened on the outer wall of the sampling tube corresponding to the sealing ring, and the sampling tube is clamped with the sealing ring through the first sealing groove. The sealing ring cooperates with the first sealing groove and the second sealing groove to ensure good sealing between the placement tube and the sampling tube, thereby ensuring that gas will not leak arbitrarily during the sampling process.

[0011] According to the above technical solution, a notch is provided on the side of the placement tube away from the leak-proof shell, the locking pin is fixedly connected to the notch of the placement tube, a locking interface is provided on one end of the locking rod corresponding to the locking pin, the locking rod is locked in the middle of the locking pin through the locking interface, and a second spring is fixedly connected to one end of the locking rod away from the locking rod. The elastic force of the second spring can ensure that the locking rods on both sides of the sampling tube can automatically realize the locking of the locking pin, thereby ensuring that after the leak-proof shell is filled with high-pressure gas, the sampling tube will not be ejected from the placement tube due to pressure.

[0012] According to the above technical solution, the sampling tube is fixedly connected with a hinge block on the side away from the leak-proof shell, and the middle hinge of the hinge block is hinged with a clamping rod. The hinge block can easily realize the rotation of the clamping rod, so as to facilitate the later clamping and disengagement between the clamping rod and the clamping pin.

[0013] According to the above technical solution, a blockage is inserted in the anti-leakage ring seat, a stepped hole is arranged in the anti-leakage ring seat, and a clamping ring groove is provided on two step surfaces from top to bottom of the step hole, a first sealing ring is clamped in the clamping ring groove at the top of the step hole, and a second sealing ring is clamped in the clamping ring groove at the bottom of the step hole. The clamping ring groove is provided on two step surfaces from top to bottom of the step hole, which can facilitate the replacement of the first sealing ring and the second sealing ring at any time in the later stage, thereby ensuring that a good sealing effect can be formed after the blockage and the anti-leakage ring seat are inserted, thereby preventing gas leakage.

[0014] According to the above technical solution, a concave surface is provided on the top of the plug, and the plug is in the shape of a stepped shaft. The concave surface provided on the top of the plug can be used to push the plug out from the leak-proof ring seat after the leak-proof shell is filled with high-pressure gas, and the gas in the leak-proof shell is greater than the gas in the tower, so that the gas in the tower can be put into the leak-proof shell to facilitate sampling by the sampling tube.

[0015] According to the above technical solution, the inflation valve includes an inflation tube, which is fixedly connected to the top of the leak-proof outer shell, a rubber ring is fixedly connected in the middle of the inflation tube, an inflation plug is inserted in the rubber ring, a stabilizing rod is fixedly connected in the middle of the inflation plug, a limiting ring 1 is slidably connected to the bottom of the stabilizing rod, the outer ring of the limiting ring 1 is fixedly connected to the inflation tube, and the stabilizing rod is sleeved with a third spring between the limiting ring 1 and the inflation plug.

[0016] According to the above technical solution, the limiting ring is fixedly connected to a limiting pin in the middle, a sliding hole is provided in the middle of the limiting pin, and the limiting ring is slidably connected to a stabilizing rod through the sliding hole, which can ensure that the stabilizing rod can slide stably, thereby ensuring that the inflatable plug can be stably opened and closed.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0018] 1. The present invention is provided with a sampling mechanism, and the entire sampling tube is inserted into the placement tube and is clamped by a clamping rod and a clamping pin. At this time, the arc rod is pressed to push the sampling plug to one side of the leak-proof shell with the cooperation of the pressure rod, so that the gas in the sampling tube is filled into the leak-proof shell, so that the air pressure in the leak-proof shell is greater than the air pressure in the tower, so that the leak-proof shell is filled with the gas in the tower. When the arc rod is released, the sampling plug is pushed back to the side of the sampling tube away from the leak-proof shell under the action of the air pressure in the leak-proof shell, and the sampling tube is filled with the gas in the tower. At this time, the clamping rod is held so that one end of the clamping rod close to the sampling plug is close to each other, so that the clamping rod and the clamping pin can be separated, and the sampling tube can be pulled out of the placement tube to achieve the sampling purpose. The sampling is carried out in a closed environment throughout the process, which can achieve a good leak-proof purpose.

[0019] 2. The present invention is provided with an anti-leakage mechanism. When the gas in the sampling tube rushes into the leak-proof shell, the pressure in the tower is lower than the pressure in the leak-proof shell. At this time, the plug is separated from the anti-leakage ring seat, so that a flow space is formed between the leak-proof shell and the tower. The gas in the tower and the gas in the leak-proof shell are mixed. When the sampling tube is pushed back, the gas pressure in the tower is greater than or equal to the gas pressure in the leak-proof shell. At this time, under the action of the first spring, the plug can be reinserted into the anti-leakage ring seat, and then sealed by the first sealing ring and the second sealing ring, thereby further achieving the purpose of anti-leakage.

[0020] 3. The present invention is provided with an inflation valve. During the sampling process, if the air in the sampling tube is too little to ensure that the air pressure in the leak-proof shell is greater than the air pressure in the tower, a good sampling purpose can be achieved. At this time, inert gas can be directly injected into the leak-proof shell through the inflation valve to increase the air pressure in the leak-proof shell, thereby ensuring that the air pressure in the leak-proof shell is greater than the air pressure in the tower, which can further enhance the purpose of leak-proof sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 It is a schematic diagram of the overall front structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the overall top view structure of the present invention;

[0024] Figure 3 It is a schematic diagram of the overall front cross-sectional structure of the present invention;

[0025] Figure 4 It is a schematic diagram of the separation of the sampling mechanism;

[0026] Figure 5 It is a top view schematic diagram of the placement cylinder and the leakproof housing;

[0027] Figure 6 It is a schematic diagram of the separation of the inflation valve;

[0028] Figure 7 It is a schematic diagram of the separation of the anti-leakage mechanism.

[0029] In the figure: 1. leak-proof shell; 2. inflation valve; 21. inflation tube; 22. rubber ring; 23. inflation plug; 24. stabilizing rod; 25. third spring; 26. limit ring one; 3. sampling mechanism; 31. arc rod; 32. pressure rod; 321. sampling plug; 33. second spring; 34. hinge block; 35. snap-on rod; 36. first sealing groove; 37. snap-on interface; 371. snap-on pin; 38. sampling tube; 381. placement tube; 39. sealing ring; 391. second sealing groove; 4. anti-leakage mechanism; 41. anti-leakage ring seat; 42. first sealing ring; 43. blockage; 44. first spring; 45. limit ring two; 46. snap-on ring groove; 47. second sealing ring. DETAILED DESCRIPTION

[0030] 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.

[0031] The present invention provides the following technical solutions:

[0032] Embodiment 1

[0033] See also Figure 1-5 and Figure 7 The tower gas sampling device comprises a leakproof shell 1, a leakproof mechanism 4 is fixedly connected to the bottom of the leakproof shell 1, a sampling mechanism 3 is fixedly connected to the left side of the leakproof shell 1, and a charging valve 2 is fixedly connected to the top of the leakproof shell 1;

[0034] The sampling mechanism 3 includes a placement tube 381, in which a sampling tube 38 is inserted, and a sampling plug 321 is interference-fitted in the sampling tube 38, a pressure rod 32 is fixedly connected in the middle of the sampling plug 321, and an arc rod 31 is fixedly connected at one end of the pressure rod 32 away from the sampling plug 321, and a clamping rod 35 is hinged on the side of the sampling tube 38 away from the leak-proof shell 1, and a hinge block 34 is fixedly connected on the side of the sampling tube 38 away from the leak-proof shell 1, and a clamping rod 35 is hinged in the middle of the hinge block 34. The hinge block 34 can easily realize the rotation of the clamping rod 35, so as to facilitate the later clamping and disengagement between the clamping rod 35 and the clamping pin 371, and the clamping pin 371 is clamped on the side of the clamping rod 35 close to the placement tube 381, and the sampling tubes 38 are fixedly connected at both ends of the clamping pin 371. By providing the sampling mechanism 3, the entire sampling tube 38 is inserted into the placement tube 38 1, and is clamped by the clamping rod 35 and the clamping pin 371. At this time, the arc rod 31 is pressed to push the sampling plug 321 to the side of the leak-proof shell 1 with the cooperation of the pressure rod 32, so that the gas in the sampling tube 38 is filled into the leak-proof shell 1, so that the air pressure in the leak-proof shell 1 is greater than the air pressure in the tower, so that the leak-proof shell 1 is filled with the gas in the tower. When the arc rod 31 is released, under the action of the air pressure in the leak-proof shell 1, the sampling plug 321 is pushed back to the side of the sampling tube 38 away from the leak-proof shell 1, and the sampling tube 38 is filled with the gas in the tower. At this time, the clamping rod 35 is held so that the end of the clamping rod 35 close to the sampling plug 321 is close to each other, so that the clamping rod 35 and the clamping pin 371 can be separated, and the sampling tube 38 can be pulled out of the placement tube 381 to achieve the sampling purpose. Sampling is carried out in a closed environment throughout the process, which can achieve a good leak prevention purpose.

[0035] A second sealing groove 391 is provided in the middle of the sampling tube 38, and a sealing ring 39 is fixedly connected to the sampling tube 38 in the second sealing groove 391. A first sealing groove 36 is provided on the outer wall of the sampling tube 38 corresponding to the sealing ring 39. The sampling tube 38 is clamped with the sealing ring 39 through the first sealing groove 36. The sealing ring 39 cooperates with the first sealing groove 36 and the second sealing groove 391 to ensure good sealing between the placement tube 381 and the sampling tube 38, thereby ensuring that gas will not leak arbitrarily during the sampling process.

[0036] A notch is provided on the side of the placement tube 381 away from the leak-proof shell 1, and the locking pin 371 is fixedly connected to the notch of the placement tube 381. A locking interface 37 is provided on one end of the locking rod 35 corresponding to the locking pin 371. The locking rod 35 is locked in the middle of the locking pin 371 through the locking interface 37. The locking rod 35 is fixedly connected to the second spring 33 at one end away from the locking rod 35. The elastic force of the second spring 33 can ensure that the locking rods 35 on both sides of the sampling tube 38 can automatically realize the locking of the locking pin 371, thereby ensuring that after the leak-proof shell 1 is filled with high-pressure gas, the sampling tube 38 will not be ejected from the placement tube 381 due to the pressure.

[0037] The anti-leakage mechanism 4 includes a second limiting ring 45, which is fixedly connected to the bottom of the leak-proof housing 1, a first spring 44 is fixedly connected to the top of the limiting ring 45, a plug 43 is fixedly connected to the top of the first spring 44, and an anti-leakage ring seat 41 is fixedly connected to the corresponding plug 43 in the leak-proof housing 1, and a first sealing ring 42 and a second sealing ring 47 are sequentially arranged in the leak-proof ring seat 41 from top to bottom. By providing the anti-leakage mechanism 4, when the gas in the sampling tube 38 rushes into the leak-proof housing 1, the pressure in the tower is less than The pressure in the leak-proof shell 1, at this time, the plug 43 is separated from the leak-proof ring seat 41, so that a flow space is formed between the leak-proof shell 1 and the tower, and the gas in the tower is mixed with the gas in the leak-proof shell 1. When the sampling tube 38 is pushed back, the gas pressure in the tower is greater than or equal to the gas pressure in the leak-proof shell 1. At this time, under the action of the first spring 44, the plug 43 can be reinserted into the leak-proof ring seat 41, and then sealed by the first sealing ring 42 and the second sealing ring 47, the purpose of leak prevention can be further achieved.

[0038] A plug 43 is inserted in the leak-proof ring seat 41, and a concave surface is provided on the top of the plug 43. The plug 43 is in the shape of a stepped shaft. After the leak-proof shell 1 is filled with high-pressure gas, the gas in the leak-proof shell 1 is greater than the gas in the tower. The plug 43 can be pushed out from the leak-proof ring seat, so that the gas in the tower is put into the leak-proof shell 1 to facilitate the sampling of the sampling tube 38. A stepped hole is provided in the leak-proof ring seat 41, and a snap-in ring groove 46 is provided on the two step surfaces from top to bottom of the stepped hole. A first sealing ring 42 is snapped in the snap-in ring groove 46 at the top of the stepped hole, and a second sealing ring 47 is snapped in the snap-in ring groove 46 at the bottom of the stepped hole. The snap-in ring groove 46 is provided on the two step surfaces from top to bottom of the stepped hole, which can facilitate the replacement of the first sealing ring 42 and the second sealing ring 47 at any time in the later stage, thereby ensuring that a good sealing effect can be formed after the plug 43 and the leak-proof ring seat 41 are plugged in, thereby preventing gas leakage.

[0039] Embodiment 2

[0040] See also Figure 1-2 and Figure 6 On the basis of the first embodiment, the inflation valve 2 further comprises an inflation tube 21, the inflation tube 21 is fixedly connected to the top of the leak-proof shell 1, a rubber ring 22 is fixedly connected in the middle of the inflation tube 21, an inflation plug 23 is inserted in the rubber ring 22, a stabilizing rod 24 is fixedly connected in the middle of the inflation plug 23, a limiting ring 26 is slidably connected to the bottom of the stabilizing rod 24, the outer ring of the limiting ring 26 is fixedly connected to the inflation tube 21, and the stabilizing rod 24 is sleeved with a third spring 25 between the limiting ring 26 and the inflation plug 23.

[0041] A limiting pin is fixedly connected in the middle of the limiting ring 26, and a sliding hole is provided in the middle of the limiting pin. The limiting ring 26 is slidably connected to the stabilizing rod 24 through the sliding hole, which can ensure that the stabilizing rod 24 can slide stably, thereby ensuring that the inflation plug 23 can be stably opened and closed. By providing an inflation valve 2, during the sampling process, the air placed in the sampling tube 38 is too little, which is not enough to ensure that the air pressure in the leak-proof shell 1 is greater than the air pressure in the tower, so as to achieve a good sampling purpose. At this time, inert gas is directly flushed into the leak-proof shell 1 through the inflation valve 2, so as to increase the air pressure in the leak-proof shell 1, thereby ensuring that the air pressure in the leak-proof shell 1 is greater than the air pressure in the tower, which can further enhance the purpose of leak-proof sampling.

[0042] When in use, the entire sampling tube 38 is inserted into the placement tube 381 and is clamped by the clamping rod 35 and the clamping pin 371. At this time, the arc rod 31 is pressed to push the sampling plug 321 to one side of the leak-proof shell 1 with the cooperation of the pressure rod 32, so that the gas in the sampling tube 38 is filled into the leak-proof shell 1, so that the air pressure in the leak-proof shell 1 is greater than the air pressure in the tower, so that the leak-proof shell 1 is filled with the gas in the tower. Under the action of the air pressure in the shell 1, the sampling plug 321 is pushed back to the side of the sampling tube 38 away from the leak-proof shell 1, and the sampling tube 38 is filled with the gas in the tower. At this time, the clamping rod 35 is held so that the end of the clamping rod 35 close to the sampling plug 321 is close to each other, so that the clamping rod 35 and the clamping pin 371 can be disengaged, and the sampling tube 38 can be pulled out of the placement tube 381 to achieve the sampling purpose. The sampling is carried out in a closed environment throughout the process, which can achieve a good leakage prevention purpose.

[0043] When the gas in the sampling tube 38 rushes into the leak-proof shell 1, the pressure in the tower is lower than the pressure in the leak-proof shell 1. At this time, the plug 43 is separated from the leak-proof ring seat 41, so that a flow space is formed between the leak-proof shell 1 and the tower, and the gas in the tower is mixed with the gas in the leak-proof shell 1. When the sampling tube 38 is pushed back, the gas pressure in the tower is greater than or equal to the gas pressure in the leak-proof shell 1. At this time, under the action of the first spring 44, the plug 43 can be reinserted into the leak-proof ring seat 41, and then sealed by the first sealing ring 42 and the second sealing ring 47, so as to further achieve the purpose of leak prevention.

[0044] During the sampling process, the air in the sampling tube 38 is too little to ensure that the air pressure in the leak-proof shell 1 is greater than the air pressure in the tower, so as to achieve a good sampling purpose. At this time, the inert gas is directly flushed into the leak-proof shell 1 through the inflation valve 2 to increase the air pressure in the leak-proof shell 1, thereby ensuring that the air pressure in the leak-proof shell 1 is greater than the air pressure in the tower, which can further enhance the purpose of leak-proof sampling.

[0045] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tower gas sampling device, comprising a leakproof housing (1), characterized in that: The bottom of the leak-proof housing (1) is fixedly connected to a leak-proof mechanism (4), the left side of the leak-proof housing (1) is fixedly connected to a sampling mechanism (3), and the top of the leak-proof housing (1) is fixedly connected to an inflation valve (2); The inflation valve (2) comprises an inflation tube (21), the inflation tube (21) being fixedly connected to the top of the leakproof housing (1), a rubber ring (22) being fixedly connected in the middle of the inflation tube (21), an inflation plug (23) being inserted in the rubber ring (22), a stabilizing rod (24) being fixedly connected in the middle of the inflation plug (23), a limiting ring (26) being slidably connected at the bottom of the stabilizing rod (24), the outer ring of the limiting ring (26) being fixedly connected to the inflation tube (21), and a third spring (25) being sleeved on the stabilizing rod (24) between the limiting ring (26) and the inflation plug (23); The sampling mechanism (3) comprises a placement tube (381), a sampling tube (38) is inserted into the placement tube (381), a sampling plug (321) is interference-fitted into the sampling tube (38), a pressure rod (32) is fixedly connected in the middle of the sampling plug (321), an end of the pressure rod (32) away from the sampling plug (321) is fixedly connected to an arc rod (31), a side of the sampling tube (38) away from the leakproof housing (1) is hingedly connected to a clamping rod (35), a side of the clamping rod (35) close to the placement tube (381) is clamped to a clamping pin (371), and both ends of the clamping pin (371) are fixedly connected to the sampling tube (38); A second sealing groove (391) is provided in the middle of the sampling tube (38), a sealing ring (39) is fixedly connected to the sampling tube (38) in the second sealing groove (391), a first sealing groove (36) is provided on the outer wall of the sampling tube (38) corresponding to the sealing ring (39), and the sampling tube (38) is clamped with the sealing ring (39) via the first sealing groove (36); A notch is formed on the side of the placement tube (381) away from the leakproof housing (1); the engaging pin (371) is fixedly connected to the notch of the placement tube (381); a engaging interface (37) is formed on one end of the engaging rod (35) corresponding to the engaging pin (371); the engaging rod (35) is engaged with the middle of the engaging pin (371) via the engaging interface (37); and a second spring (33) is fixedly connected to one end of the engaging rod (35) away from the engaging rod (35); The anti-leakage mechanism (4) comprises a second limiting ring (45), the second limiting ring (45) being fixedly connected to the bottom of the anti-leakage housing (1), the top of the second limiting ring (45) being fixedly connected to a first spring (44), the top of the first spring (44) being fixedly connected to a plug (43), the anti-leakage ring seat (41) being fixedly connected to the plug (43) in the anti-leakage housing (1), the anti-leakage ring seat (41) being provided with a first sealing ring (42) and a second sealing ring (47) in sequence from top to bottom; A plug (43) is inserted into the anti-leakage ring seat (41), a stepped hole is arranged in the anti-leakage ring seat (41), two step surfaces from top to bottom of the stepped hole are provided with snap ring grooves (46), a first sealing ring (42) is snapped into the snap ring groove (46) at the top of the stepped hole, and a second sealing ring (47) is snapped into the snap ring groove (46) at the bottom of the stepped hole; A limiting pin is fixedly connected in the middle of the limiting ring 1 (26), a sliding hole is provided in the middle of the limiting pin, and the limiting ring 1 (26) is slidably connected to the stabilizing rod (24) through the sliding hole.

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