Gas cylinder airtightness detection device

Abstract

The invention relates to the technical field of gas cylinder detection, in particular to a gas cylinder airtightness detection device which comprises a base, a clamping rotating structure is arranged at the upper end of the base, a gas cylinder is clamped on the clamping rotating structure, a lifting structure is arranged at the upper end of the base, and a sealing shell arranged on the outer side wall of the gas cylinder in a sleeving mode is installed on the lifting structure. An air pressure sensing structure is installed at the upper end of the sealing shell, four air bag shells are arranged on the bottom of an inner cavity of the sealing shell in a circumferential array mode, the outer wall of a gas cylinder is clamped through the four sealing gaskets and the air bags, effective sealing can be conducted when the outer wall of the gas cylinder is uneven, and the detection accuracy is improved; and meanwhile, the outer surface of the gas cylinder is cleaned by the cylindrical gas bag through expansion rotation of the cylindrical gas bag, when the gas bag is wizened, self-cleaning can be achieved when the gas bag rotates through sagging of the gas bag, gaps between the sealing gaskets can be filled when the gas bag is subjected to secondary expansion, and the result stability is improved.

Description

Technical Field

[0001] The present invention relates to the field of technical gas cylinder detection, and specifically to a gas cylinder airtightness detection device. Background Art

[0002] Carbon dioxide gas cylinders are usually used for high-pressure storage of carbon dioxide gas. The pressure of these gas cylinders is significantly higher than the atmospheric pressure. Since carbon dioxide gas is stored under high pressure, if the gas cylinder has poor sealing performance, the gas is likely to leak, which will not only cause gas loss but also pose a threat to the use safety.

[0003] A gas cylinder airtightness detection device with the publication number of CN117906882B includes a base plate. An air inflation pump is installed on the upper side of the base plate. The air outlet end of the air inflation pump is connected to an air inflation pipe. It further includes: an air inflation column fixed at the central position on the upper side of the base plate, and a back pressure sealing mechanism is arranged at the lower end outside the air inflation column; a gas cylinder positioning mechanism is arranged on the lower side of the base plate. Through the back pressure sealing mechanism of the present invention, when detecting the airtightness of the gas cylinder by inflating the gas cylinder, the diameters of the first sealing ring, the second sealing ring, and the third sealing ring therein become larger, so that the three of them can closely fit on the inner wall of the opening of the gas cylinder, thereby achieving the effect of sealing the opening of the gas cylinder. Three seals are formed by the first sealing ring, the second sealing ring, and the third sealing ring, improving the sealing effect, preventing leakage after high-pressure air is filled into the gas cylinder, and improving the accuracy of airtightness detection.

[0004] However, when the gas cylinder is refilled for the second time, after long-term use, there are pits and dust on the surface of the gas cylinder. At this time, if only the sealing ring is used for sealing, the airtightness is likely to be reduced, making the carbon dioxide gas easy to flow out from the concave part of the bottle body during the inspection process, affecting the accuracy of the detection. At the same time, more dust on the surface of the gas cylinder will also affect the sealing effect of the sealing ring. Summary of the Invention

[0005] The purpose of the invention is to provide a gas cylinder airtightness detection device to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A gas cylinder airtightness detection device includes a base. A clamping and rotating structure is arranged at the upper end of the base. A gas cylinder is clamped on the clamping and rotating structure. A lifting structure is arranged at the upper end of the base. A sealing shell sleeved on the outer side wall of the gas cylinder is installed on the lifting structure. A pressure sensing structure is installed at the upper end of the sealing shell.

[0007] On the bottom of the inner cavity of the sealed shell, four airbag shells are circumferentially arrayed, and each airbag shell can slide towards the direction close to the sealed shell. An airbag is fixedly connected inside the cavity of the airbag shell. The upper end of the airbag shell abuts against four arc-shaped strips, and each arc-shaped strip can slide towards the sealed shell. A sealing pad is fixedly connected to the side of each arc-shaped strip close to the sealed shell. Four air intake pipes communicating with the corresponding airbags are slidably connected to the outer side wall of the sealed shell;

[0008] At the upper end of the side of the airbag close to the sealed shell, a connecting pipe is fixedly connected. The upper end of the connecting pipe is rotatably connected with two non-touching positioning pieces. A cylindrical airbag is fixedly installed between the two positioning pieces. On the inner wall of the positioning piece close to the connecting pipe, a rotating ring is rotatably connected. On the inner wall of the rotating ring, a rotating column is rotatably connected. On the side of the rotating column far from the connecting pipe, an L-shaped rod is fixedly connected. On the side of the L-shaped rod far from the rotating column, a polishing column is fixedly connected. A polishing wheel is sleeved on the outer side wall of the polishing column. A number of wheel teeth are circumferentially arrayed on the outer side wall of the polishing wheel. At the end of the rotating column far from the L-shaped rod, a rotating structure is provided, and the rotating structure can drive the L-shaped rod to rotate and adjust its position;

[0009] At the end of the cylindrical airbag far from the connecting pipe, a driving structure is provided, and the driving structure can drive the cylindrical airbag to rotate.

[0010] Preferably, the driving structure includes a sliding plate. The sliding plate is installed on the side of the positioning piece far from the connecting pipe. A plum blossom piece is fixedly connected to the inner side wall of the connecting pipe. One side of the plum blossom piece is rotatably connected with a first rotating shaft. One end of the first rotating shaft is fixedly connected with the positioning piece on one side of the sliding plate. A motor is fixedly connected to the side of the sliding plate far from the positioning piece, and the output end of the motor is fixedly connected with the first rotating shaft. A positioning rod is fixedly connected to the lower side of the end of the sliding plate far from the motor, and the positioning rod is fixedly connected with the outer side wall of the airbag shell.

[0011] Preferably, the air pressure sensing structure includes a piston shell. The piston shell is fixedly connected to the upper end of the sealed shell. A second piston rod is slidably connected to the inner wall of the piston shell. A second spring is sleeved on the outer side wall of the second piston rod. An inductor is fixedly connected to the upper end of the piston shell.

[0012] Preferably, the rotating structure includes a second rotating shaft. The second rotating shaft is fixedly connected to the position on the lower surface of the rotating column far from the central axis. A connecting rod is fixedly connected to the outer side wall of the second rotating shaft. One end of the connecting rod far from the second rotating shaft is fixedly connected with a third rotating shaft. On the side of the third rotating shaft far from the connecting rod, a first piston rod is fixedly connected.

[0013] Preferably, a piston cavity is formed on the side of the airbag shell close to the first piston rod, and the first piston rod is slidably connected with the piston cavity. A first spring is fixedly connected between the first piston rod and the bottom of the inner cavity of the piston cavity. An air inlet hole communicating with the airbag is formed on the inner side wall of the piston cavity.

[0014] Preferably, the clamping and rotating structure includes four electric push rods 1, which are installed at the upper end of the base in a circular array along the center circumference of the base. The output end of each electric push rod 1 is fixedly connected to an electric wheel, and the electric wheels can contact the outer wall of the gas cylinder.

[0015] Preferably, the lifting structure includes a second electric push rod, which is fixed to the upper end of the base, and a sleeve is fixed to the output end of the second electric push rod, and the sleeve is sleeved on the outer side wall of the sealing shell.

[0016] Preferably, four cylinders one are installed in a circular array on the bottom of the inner cavity of the sealing shell, and the output end of each cylinder one is fixedly connected to the airbag shell at the corresponding position, and four cylinders two are installed in a circular array on the inner side wall of the sealing shell, and the output end of each cylinder two is fixedly connected to the arc strip at the corresponding position.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The cylindrical airbag is driven by a motor to rotate and clean the outer wall of the gas cylinder by scratching it. During the cleaning process, the grinding wheel rotates on the outside of the grinding column to heat the cavity of the cylindrical airbag, thereby improving the expansion effect of the cylindrical airbag. Then, when the cleaning is completed, the airbag and the cylindrical airbag are deflated by deflating the airbag and the cylindrical airbag. Then, the sealing pad is moved to clamp and seal the gas cylinder. At this time, the deflated cylindrical airbag is used to whip one end of the sealing pad to clean the cylindrical airbag itself. At the same time, the grinding wheel causes the wrinkles and vibrations of the deflated cylindrical airbag to improve the cleaning effect of the wrinkles. Then, the gap between the sealing pads is filled through the secondary expansion of the cylindrical airbag. At the same time, the expanded airbags conflict with each other and contact the outer wall of the gas cylinder, thereby further improving the sealing effect. The adaptability to the gas cylinder is improved through clamping and sealing. When the airbag with an uneven outer wall or annual repair needs to be re-inflated and then inspected, it can adapt to the differences in its appearance and conduct sealing inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further explained below in conjunction with the accompanying drawings and embodiments:

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the present invention with the sealing shell removed;

[0022] Figure 3 is a schematic structural diagram of the sealing gasket of the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the airbag of the present invention;

[0024] Figure 5 Schematic cross-sectional structure diagram of the cylindrical airbag of the present invention;

[0025] Figure 6 Schematic cross-sectional structure diagram of the whole of the present invention;

[0026] Figure 7 Schematic bottom-up structure diagram of the cylindrical airbag of the present invention;

[0027] Figure 8 For the present invention Figure 5 Local enlarged view of part A in;

[0028] Figure 9 Schematic structure diagram of the present invention with the cylindrical airbag removed.

[0029] Explanation of reference numerals in the drawings:

[0030] 1. Base; 2. Gas cylinder; 3. Sealing shell; 4. Airbag shell; 5. Airbag; 6. Connecting pipe; 7. Arc-shaped strip; 8. Connecting pipe; 9. Positioning piece; 91. Outer ring; 92. Inner ring; 10. Cylindrical airbag; 11. Rotating ring; 12. Plum blossom piece; 13. First rotating shaft; 14. Sliding plate; 15. Motor; 16. Positioning rod; 17. Sealing gasket; 18. Rotating column; 19. Second rotating shaft; 20. Connecting rod; 21. Third rotating shaft; 22. First piston rod; 23. First spring; 24. Piston chamber; 25. Air inlet hole; 26. L-shaped rod; 27. Grinding column; 28. Grinding wheel; 29. Tooth profile; 30. First electric push rod; 31. Electric wheel; 32. Second electric push rod; 33. Sleeve; 34. Piston shell; 35. Second piston rod; 36. Second spring; 37. Inductor; 38. First cylinder; 39. Second cylinder. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figures 1 - 9 , the present invention provides a technical solution: A gas cylinder airtightness detection device includes a base 1, a clamping and rotating structure is arranged at the upper end of the base 1, a gas cylinder 2 is clamped on the clamping and rotating structure, a lifting structure is arranged at the upper end of the base 1, and a sealing shell 3 sleeved on the outer side wall of the gas cylinder 2 is installed on the lifting structure; the upper end of the sealing shell 3 is installed with a pressure sensing structure;

[0033] On the bottom of the inner cavity of the sealing shell 3, four airbag shells 4 are arranged in a circumferential array, and each airbag shell 4 can slide towards the direction close to the sealing shell 3. An airbag 5 is fixedly connected inside the airbag shell 4. Four arc-shaped strips 7 are abutted against the upper end of the airbag shell 4, and each arc-shaped strip 7 can slide towards the sealing shell 3. A sealing gasket 17 is fixedly connected to the side of each arc-shaped strip 7 close to the sealing shell 3. Four air intake pipes 6 communicating with the corresponding airbags 5 are slidably connected to the outer side wall of the sealing shell 3. The air intake pipes 6 can communicate with an inflation pipe from the outside to inflate and deflate the airbags 5;

[0034] At the upper end of the side of the airbag 5 close to the sealing shell 3, a connecting pipe 8 is fixedly connected. The upper end of the connecting pipe 8 is rotatably connected with two non-touching positioning pieces 9. A cylindrical airbag 10 is fixedly installed between the two positioning pieces 9. The inner wall of the positioning piece 9 close to the connecting pipe 8 is rotatably connected with a rotating ring 11. The inner wall of the rotating ring 11 is rotatably connected with a rotating column 18. The side of the rotating column 18 away from the connecting pipe 8 is fixedly connected with an L-shaped rod 26. The side of the L-shaped rod 26 away from the rotating column 18 is fixedly connected with a grinding column 27. A grinding wheel 28 is sleeved on the outer side wall of the grinding column 27. A number of wheel teeth 29 are arranged in a circumferential array on the outer side wall of the grinding wheel 28. A rotating structure is arranged at the end of the rotating column 18 away from the L-shaped rod 26. The rotating structure can drive the L-shaped rod 26 to rotate and adjust its position. Among them, the positioning piece 9 close to the sliding plate 14 is in a sealed state, and the air inside the cylindrical airbag 10 will not leak. Refer to Figure 9 , the lower positioning piece 9 is separated into an outer ring 91 and an inner ring 92 by the rotating ring 11. When the positioning piece 9 and the cylindrical airbag 10 rotate together, only the outer ring 91 of the lower positioning piece 9 rotates, and at the same time, the rotating ring 11 always remains in its original position. When the airbag 5 expands, it can fill the gaps between each airbag 5;

[0035] A driving structure is arranged at the end of the cylindrical airbag 10 away from the connecting pipe 8. The driving structure can drive the cylindrical airbag 10 to rotate.

[0036] Specifically, refer to Figure 2 , where the airbag shells 4 and the arc-shaped strips 7 are both arranged in a circumferential array along the sealing shell 3. However, relative to the airbag shells 4, each arc-shaped strip 7 is located between two airbag shells 4. The gap between the two arc-shaped strips 7 is at the center position of the airbag 5, and the position of the connecting pipe 8 is also at the center position of the airbag 5. When the airbag 5 is inflated, the cylindrical airbag 10 will also be inflated accordingly. Refer to Figure 3, where the airbag 5 is in a filled state, and the position of the cylindrical airbag 10 is at the upper end of the airbag 5 on the side close to the sealing shell 3. When the airbag 5 is filled, it will drive the cylindrical airbag 10 to fit towards the sealing shell 3. At the same time, when the cylindrical airbag 10 is filled and inflated, it will come into contact with the outer wall of the sealing shell 3. When the driving structure drives the cylindrical airbag 10 to rotate, it will scrape the outer surface of the sealing shell 3. At the same time, if there are depressions on the surface of the gas cylinder 2, the cylindrical airbag 10 can also be embedded into the depressions for cleaning, thereby removing the dust on the outer surface of the sealing shell 3;

[0037] However, after the outer wall of the sealing shell 3 is cleaned, the airbag 5 and the sealing shell 3 start to deflate. At this time, the sealing gasket 17 will be pushed to fit with the outer wall of the sealing shell 3. At this time, the cylindrical airbag 10 will be between the two sealing gaskets 17. At this time, the cylindrical airbag 10 is in a deflated state. At this time, by rotating the cylindrical airbag 10, the deflated cylindrical airbag 10 will whip on the outer wall of the sealing gasket 17, thereby realizing self-cleaning of the cylindrical airbag 10. Then, after the self-cleaning of the cylindrical airbag 10 is completed, the cylindrical airbag 10 and the airbag 5 are inflated again, so that the cylindrical airbag 10 fills the gap between the two arc-shaped strips 7, solving the air leakage problem generated when the sealing shell 3 is sealed by clamping.

[0038] Among them, the driving structure includes a sliding plate 14. The sliding plate 14 is installed on the side of the positioning piece 9 away from the connecting pipe 8. A plum blossom piece 12 is fixedly connected to the inner wall of the connecting pipe 8. One side of the plum blossom piece 12 is rotatably connected to a rotating shaft one 13. One end of the rotating shaft one 13 is fixedly connected to the positioning piece 9 on one side of the sliding plate 14. A motor 15 is fixedly connected to the side of the sliding plate 14 away from the positioning piece 9, and the output end of the motor 15 is fixedly connected to the rotating shaft one 13. A positioning rod 16 is fixedly connected to the lower side of the end of the sliding plate 14 away from the motor 15, and the positioning rod 16 is fixedly connected to the outer wall of the airbag shell 4. Among them, the motor 15 drives the rotating shaft one 13 to rotate, and the rotating shaft one 13 drives the two positioning pieces 9 and the cylindrical airbag 10 to rotate.

[0039] Among them, the air pressure sensing structure includes a piston shell 34. The piston shell 34 is fixedly connected to the upper end of the sealing shell 3. A piston rod two 35 is slidably connected to the inner wall of the piston shell 34. A spring two 36 is sleeved on the outer wall of the piston rod two 35. An inductor 37 is fixedly connected to the upper end of the piston shell 34. Among them, when the pressure inside the sealing shell 3 increases when the gas cylinder 2 leaks, it will push the piston rod two 35 to slide upward, so as to contact the inductor 37 to judge whether each area of the gas cylinder 2 leaks.

[0040] Among them, the rotating structure includes a second rotating shaft 19, which is fixedly connected to the position on the lower surface of the rotating column 18 away from the central axis. A connecting rod 20 is fixedly connected to the outer side wall of the second rotating shaft 19. One end of the connecting rod 20 away from the second rotating shaft 19 is fixedly connected to a third rotating shaft 21. A first piston rod 22 is fixedly connected to the side of the third rotating shaft 21 away from the connecting rod 20.

[0041] Among them, a piston chamber 24 is formed on the side of the airbag shell 4 close to the first piston rod 22, and the piston chamber 24 is slidably connected to the first piston rod 22. A first spring 23 is fixedly connected between the first piston rod 22 and the inner cavity bottom of the piston chamber 24. An air inlet hole 25 communicating with the airbag 5 is formed on the inner side wall of the piston chamber 24.

[0042] Specifically, referring to Figure 8 , when the air flow inside the airbag 5 is full, the air flow fills the inside of the piston chamber 24 through the air inlet hole 25, and at the same time pushes the first spring 23 to slide to the right. When the first spring 23 slides to the right, it will push the second rotating shaft 19 to rotate around the rotating column 18, so that the second rotating shaft 19 is located at the position closest to the connecting pipe 8. At this time, the L-shaped rod 26 will rotate and push to make the grinding wheel 28 fit against the outer side wall of the first rotating shaft 13. At this time, when the first rotating shaft 13 rotates, it will contact the teeth 29 on the outer surface of the grinding wheel 28. The teeth 29 play a role in increasing the contact area with the first rotating shaft 13, so that the rotation of the first rotating shaft 13 drives the grinding wheel 28 to rotate. During the rotation of the grinding wheel 28, the inner side wall of the grinding wheel 28 will rub against the outer side wall of the grinding column 27, generating heat. At the same time, when the teeth 29 contact the first rotating shaft 13, the grinding wheel 28 will be pushed to increase the contact with the inside of the grinding column 27, thereby improving the friction effect. Through the heat generated by the friction, the air volume in the cavity of the cylindrical airbag 10 becomes larger, so that the cylindrical airbag 10 expands slightly. And the expansion effect is different from continuously filling gas into the cylindrical airbag 10, which is more gentle and will not cause the cylindrical airbag 10 to expand and rupture, thereby improving the cleaning effect of the cylindrical airbag 10 on the outer surface of the gas cylinder 2. Then when the gas inside the airbag 5 is discharged, due to the elastic reset of the first spring 23, the second rotating shaft 19 is pulled to a position away from the connecting pipe 8. At this time, referring to Figure 8 , the grinding wheel 28 also rotates to contact the leftmost side of the cylindrical airbag 10. When the cylindrical airbag 10 is deflated and impacts the side of the sealing gasket 17 during rotation to clean the surface, wrinkles are likely to be generated at the deflated and drooping position. Dust is likely to be embedded in these wrinkles. At this time, when the wrinkles pass by one side of the grinding wheel 28, due to the large friction between the grinding wheel 28 and the grinding column 27, the rotation of the cylindrical airbag 10 will not be able to drive the grinding wheel 28 to rotate. At this time, the wrinkles formed by the cylindrical airbag 10 will rub against the teeth 29 and the wrinkles will jolt continuously, so as to partially smooth the cylindrical airbag 10 and push out the internal dust through the jolting.

[0043] Among them, the clamping and rotating structure includes four electric push rods 30, which are installed at the upper end of the base 1 in an array along the center circumference of the base 1. The output end of each electric push rod 30 is fixedly connected to an electric wheel 31, and the electric wheels 31 can contact the outer wall of the gas cylinder 2. The electric wheel 31 clamps the gas cylinder 2 and drives the gas cylinder 2 to rotate, so that the cylindrical airbag 10 can make uniform contact with the outer wall of the gas cylinder 2.

[0044] Among them, the lifting structure includes an electric push rod 32, which is fixed to the upper end of the base 1. The output end of the electric push rod 32 is fixed with a sleeve 33, which is sleeved on the outer wall of the sealing shell 3 and can drive the sealing shell 3 to rise and fall.

[0045] Among them, four cylinders 1 38 are installed in a circular array on the bottom of the inner cavity of the sealing shell 3, and the output end of each cylinder 1 38 is fixedly connected to the airbag shell 4 at the corresponding position, and four cylinders 2 39 are installed in a circular array on the inner wall of the sealing shell 3, and the output end of each cylinder 2 39 is fixedly connected to the arc strip 7 at the corresponding position.

[0046] Working principle: The worker first clamps the gas cylinder 2 between the four electric wheels 31, and then drives the sealing shell 3 to continuously descend through the electric push rod 2 32. After descending to a suitable height, the airbag 5 and the cylindrical airbag 10 are inflated to make the cylindrical airbag 10 contact the outer wall of the gas cylinder 2. Then, the motor 15 drives the cylindrical airbag 10 to rotate to scratch and clean the outer wall of the gas cylinder 2. At the same time, the electric wheel 31 drives the gas cylinder 2 to rotate, so that more areas of the gas cylinder 2 are cleaned. During the cleaning process, the grinding wheel 28 rotates on the outside of the grinding column 27 to heat the cavity of the cylindrical airbag 10 to improve the expansion effect of the cylindrical airbag 10. Then, when the cleaning is completed, the gas is The deflation of the bag 5 and the cylindrical airbag 10 causes the cylindrical airbag 10 to deflate, and then the sealing gasket 17 moves to clamp and seal the gas cylinder 2. At this time, the deflated cylindrical airbag 10 whips one end of the sealing gasket 17 to clean the cylindrical airbag 10 itself. At the same time, the grinding wheel 28 causes the wrinkles and vibrations of the deflated cylindrical airbag 10 to improve the cleaning effect of the wrinkles. Then, the gap between the sealing gaskets 17 is filled through the secondary expansion of the cylindrical airbag 10. At the same time, the expanded airbag 5 conflicts with each other and contacts the outer wall of the gas cylinder 2, further improving the sealing effect, so that the gap through clamping and sealing is resolved, and finally the air pressure sensing structure is used to detect whether the nozzle and the bottle body are leaking.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A gas cylinder air tightness detection device, comprising a base (1), characterized in that: The upper end of the base (1) is provided with a clamping and rotating structure, on which a gas cylinder (2) is clamped, the upper end of the base (1) is provided with a lifting structure, on which a sealing shell (3) sleeved on the outer wall of the gas cylinder (2) is installed, and the upper end of the sealing shell (3) is provided with a gas pressure sensing structure; The bottom of the inner cavity of the sealing shell (3) is provided with four airbag shells (4) in a circular array, and each airbag shell (4) can slide in a direction close to the sealing shell (3); an airbag (5) is fixedly connected in the cavity of the airbag shell (4); the upper end of the airbag shell (4) abuts against four arc-shaped strips (7), and each arc-shaped strip (7) can slide in a direction close to the sealing shell (3); a sealing pad (17) is fixedly connected to one side of each arc-shaped strip (7) close to the sealing shell (3); and four air connection pipes (6) in communication with the airbags (5) at corresponding positions are slidably connected to the outer wall of the sealing shell (3); A connecting tube (8) is fixedly connected to the upper end of the airbag (5) on the side close to the sealing shell (3); two mutually non-contacting positioning pieces (9) are rotatably connected to the upper end of the connecting tube (8); a cylindrical airbag (10) is fixedly installed between the two positioning pieces (9); a rotating ring (11) is rotatably connected to the inner wall of the positioning piece (9) on the side close to the connecting tube (8); a rotating column (18) is rotatably connected to the inner wall of the rotating ring (11); the rotating column (18) An L-shaped rod (26) is fixedly connected to the side away from the connecting tube (8), and a grinding column (27) is fixedly connected to the side of the L-shaped rod (26) away from the rotating column (18). A grinding wheel (28) is sleeved on the outer wall of the grinding column (27), and a plurality of gear teeth (29) are installed in a circumferential array on the outer wall of the grinding wheel (28). A rotating structure is arranged at one end of the rotating column (18) away from the L-shaped rod (26), and the rotating structure can drive the L-shaped rod (26) to rotate and adjust the position; A driving structure is provided at one end of the cylindrical airbag (10) away from the connecting tube (8), and the driving structure can drive the cylindrical airbag (10) to rotate.

2. A gas cylinder air tightness detection device according to claim 1, characterized in that: The driving structure comprises a sliding plate (14), wherein the sliding plate (14) is mounted on a side of a positioning plate (9) away from a connecting tube (8), a plum blossom plate (12) is fixedly connected to an inner side wall of the connecting tube (8), one side of the plum blossom plate (12) is rotatably connected to a rotating shaft (13), one end of the rotating shaft (13) is fixedly connected to the positioning plate (9) on one side of the sliding plate (14), a motor (15) is fixedly connected to a side of the sliding plate (14) away from the positioning plate (9), and an output end of the motor (15) is fixedly connected to the rotating shaft (13), a positioning rod (16) is fixedly connected to the lower side of one end of the sliding plate (14) away from the motor (15), and the positioning rod (16) is fixedly connected to the outer side wall of the airbag shell (4).

3. A gas cylinder air tightness detection device according to claim 1, characterized in that: The air pressure sensing structure comprises a piston shell (34), wherein the piston shell (34) is fixedly connected to the upper end of the sealing shell (3), the inner wall of the piston shell (34) is slidably connected to a second piston rod (35), the outer wall of the second piston rod (35) is sleeved with a second spring (36), and the upper end of the piston shell (34) is fixedly connected to a sensor (37).

4. A gas cylinder air tightness detection device according to claim 1, characterized in that: The rotating structure comprises a rotating shaft 2 (19), wherein the rotating shaft 2 (19) is fixedly connected to a position of the lower surface of the rotating column (18) away from the central axis, a connecting rod (20) is fixedly connected to the outer wall of the rotating shaft 2 (19), an end of the connecting rod (20) away from the rotating shaft 2 (19) is fixedly connected to a rotating shaft 3 (21), and a side of the rotating shaft 3 (21) away from the connecting rod (20) is fixedly connected to a piston rod 1 (22).

5. A gas cylinder air tightness detection device according to claim 4, characterized in that: A piston chamber (24) is provided on a side of the airbag housing (4) close to the piston rod (22), and the piston chamber (24) is slidably connected to the piston rod (22). A spring (23) is fixedly connected between the piston rod (22) and the inner chamber bottom of the piston chamber (24). An air inlet hole (25) connected to the airbag (5) is provided on the inner side wall of the piston chamber (24).

6. A gas cylinder air tightness detection device according to claim 1, characterized in that: The clamping and rotating structure comprises four electric push rods (30), which are installed on the upper end of the base (1) in a circular array along the center of the base (1), and the output end of each electric push rod (30) is fixedly connected to an electric wheel (31), and the electric wheel (31) can contact the outer wall of the gas cylinder (2).

7. A gas cylinder air tightness detection device according to claim 1, characterized in that: The lifting structure comprises an electric push rod 2 (32), the electric push rod 2 (32) is fixedly connected to the upper end of the base (1), the output end of the electric push rod 2 (32) is fixedly connected to a sleeve (33), and the sleeve (33) is sleeved on the outer wall of the sealing shell (3).

8. A gas cylinder air tightness detection device according to claim 1, characterized in that: The inner cavity bottom of the sealing shell (3) is provided with four cylinders (38) in a circular array, and the output end of each cylinder (38) is fixedly connected to the airbag shell (4) at the corresponding position. The inner side wall of the sealing shell (3) is provided with four cylinders (39) in a circular array, and the output end of each cylinder (39) is fixedly connected to the arc strip (7) at the corresponding position.

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