A gas cylinder airtightness detection device

Abstract

The application relates to a gas cylinder airtightness detection device, which comprises a base, the upper end of the base is provided with a clamping rotating structure, the clamping rotating structure clamps a gas cylinder, the upper end of the base is provided with a lifting structure, the lifting structure is provided with a sealing shell which is sleeved on the outer wall of the gas cylinder, the upper end of the sealing shell is provided with a gas pressure sensing structure, and the inner cavity bottom of the sealing shell is provided with four air bag shells in a circumferential array. The outer wall of the gas cylinder is clamped by four sealing pads and air bags, so that the gas cylinder can be effectively sealed when encountering uneven outer walls, the detection accuracy is improved, the outer surface of the gas cylinder is cleaned by the expansion and rotation of the cylindrical air bag, the air bag can be self-cleaned when the air bag is deflated and the air bag rotates, the gap between the sealing pads can be filled when the air bag is inflated again, and the stability of the result is improved.

Description

Technical Field

[0001] This invention relates to the field of gas cylinder testing, specifically a gas cylinder airtightness testing device. Background Technology

[0002] Carbon dioxide cylinders are typically used for high-pressure storage of carbon dioxide gas. The pressure in these cylinders is significantly higher than atmospheric pressure. Because carbon dioxide gas is stored under high pressure, if the cylinder is not properly sealed, the gas can easily leak. This can not only lead to gas loss but also pose a threat to safety.

[0003] A gas cylinder airtightness testing device, disclosed in CN117906882B, includes a base plate. An air pump is mounted on the upper side of the base plate, and an air pump outlet is connected to an air filling pipe. The device also includes an air filling column fixed at the center of the upper side of the base plate, with a back-pressure sealing mechanism at its lower outer end. A gas cylinder positioning mechanism is located on the lower side of the base plate. This invention utilizes the back-pressure sealing mechanism to increase the diameter of the first, second, and third sealing rings during gas cylinder filling testing. This allows the three rings to tightly adhere to the inner wall of the gas cylinder opening, effectively sealing the opening. The three sealing rings create a triple seal, improving the sealing effect and preventing leakage after high-pressure air is introduced into the gas cylinder, thus improving the accuracy of airtightness testing.

[0004] However, when refilling gas cylinders, the surface of the cylinders has pits and dust after long-term use. If only a sealing ring is used for sealing, the airtightness will be reduced. During the inspection, carbon dioxide gas can easily leak out from the dents in the cylinder body, affecting the accuracy of the test. At the same time, a lot of 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 this invention is to provide a gas cylinder airtightness testing device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a gas cylinder airtightness testing device, comprising a base, a clamping and rotating structure provided at the upper end of the base, a gas cylinder being clamped on the clamping and rotating structure, a lifting structure provided at the upper end of the base, a sealing shell sleeved on the outer side wall of the gas cylinder being installed on the lifting structure, and a pressure sensing structure being installed at the upper end of the sealing shell.

[0007] The inner cavity of the sealing shell has four airbag shells arranged in a circular array on the bottom, and each airbag shell can slide towards the sealing shell. An airbag is fixedly connected inside the cavity of each airbag shell. The upper end of each airbag shell abuts against four arc-shaped strips, and each arc-shaped strip can slide towards the sealing shell. A sealing gasket is fixedly connected to the side of each arc-shaped strip near the sealing shell. Four air inlets communicating with the corresponding airbags are slidably connected to the outer wall of the sealing shell.

[0008] A connecting tube is fixedly connected to the upper end of the airbag near the sealing shell. Two non-contact positioning plates are rotatably connected to the upper end of the connecting tube. A cylindrical airbag is fixedly installed between the two positioning plates. A rotating ring is rotatably connected to the inner wall of the positioning plate near the connecting tube. A rotating column is rotatably connected to the inner wall of the rotating ring. An L-shaped rod is fixedly connected to the side of the rotating column away from the connecting tube. A grinding column is fixedly connected to the side of the L-shaped rod away from the rotating column. A grinding wheel is sleeved on the outer wall of the grinding column. Several teeth are circumferentially arranged on the outer wall of the grinding wheel. A rotating structure is provided at the end of the rotating column away from the L-shaped rod. The rotating structure can drive the L-shaped rod to rotate and adjust its position.

[0009] The cylindrical airbag is equipped with a driving structure at the end away from the connecting tube, and the driving structure can drive the cylindrical airbag to rotate.

[0010] Preferably, the drive structure includes a sliding plate, which is installed on the side away from the positioning piece of the connecting tube. A slatted plate is fixedly connected to the inner wall of the connecting tube. A rotating shaft is rotatably connected to one side of the slatted plate. One end of the rotating shaft is fixedly connected to the positioning piece on one side of the sliding plate. A motor is fixedly connected to the side of the sliding plate away from the positioning piece, and the output end of the motor is fixedly connected to the rotating shaft. A positioning rod is fixedly connected to the lower side of the sliding plate away from the motor, and the positioning rod is fixedly connected to the outer wall of an airbag shell at a corresponding position.

[0011] Preferably, the pressure sensing structure includes a piston shell, which is fixedly connected to the upper end of the sealing shell. A piston rod is slidably connected to the inner wall of the piston shell, and a spring is sleeved on the outer wall of the piston rod. A sensor is fixedly connected to the upper end of the piston shell.

[0012] Preferably, the rotating structure includes a second rotating shaft, which is fixedly connected to the lower surface of the rotating column at a position away from the central axis. A connecting rod is fixedly connected to the outer side wall of the second rotating shaft. A third rotating shaft is fixedly connected to the end of the connecting rod away from the second rotating shaft. A first piston rod is fixedly connected to the side of the third rotating shaft away from the connecting rod.

[0013] Preferably, the airbag shell has a piston chamber on the side near the piston rod, and the piston chamber is slidably connected to the piston rod. A spring is fixed between the piston rod and the bottom of the inner cavity of the piston chamber, and an air inlet communicating with the airbag is provided on the inner wall of the piston chamber.

[0014] Preferably, the clamping and rotating structure includes four electric actuators, which are arranged in a circular array around the center of the base on the upper end of the base. Each electric actuator has an electric wheel fixedly connected to its output end, and the electric wheels are able to abut against the outer wall of the gas cylinder.

[0015] Preferably, the lifting structure includes an electric actuator two, which is fixedly connected to the upper end of the base, and a sleeve is fixedly connected to the output end of the electric actuator two, which is sleeved on the outer wall of the sealing shell.

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

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

[0018] The cylindrical airbag, driven by a motor, rotates to scrape and clean the outer wall of the gas cylinder. During the cleaning process, a grinding wheel rotates on the outside of the grinding column, heating the cavity of the cylindrical airbag and increasing its expansion effect. After cleaning, the airbag and the cylindrical airbag are deflated, causing the cylindrical airbag to collapse. Then, the sealing gasket moves to clamp and seal the gas cylinder. At this time, the collapsed cylindrical airbag pumps against one end of the sealing gasket to clean the airbag itself. Simultaneously, the grinding wheel cleans the wrinkles and creases of the collapsed cylindrical airbag through vibration. Then, the cylindrical airbag expands again to fill the gap between the sealing gaskets. At the same time, the expanding airbags press against each other and contact the outer wall of the gas cylinder, further improving the sealing effect. The clamping and sealing improves the adaptability to gas cylinders. When it is necessary to re-inflate and test airbags with uneven outer walls or those that have been under repair for a year, it can adapt to the differences in appearance and perform sealing tests. Attached Figure Description

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

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

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

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

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

[0024] Figure 5 This is a cross-sectional view of the cylindrical airbag of the present invention.

[0025] Figure 6 This is a schematic cross-sectional view of the overall structure of the present invention;

[0026] Figure 7 This is a bottom view of the cylindrical airbag structure of the present invention;

[0027] Figure 8 For the present invention Figure 5 A magnified view of a section at point A in the middle;

[0028] Figure 9 This is a schematic diagram of the structure for removing the cylindrical airbag according to the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Base; 2. Gas cylinder; 3. Sealing shell; 4. Airbag shell; 5. Airbag; 6. Air inlet pipe; 7. Arc-shaped strip; 8. Connecting pipe; 9. Positioning plate; 91. Outer ring; 92. Inner ring; 10. Cylindrical airbag; 11. Rotating ring; 12. Plum blossom-shaped piece; 13. Rotating shaft one; 14. Sliding plate; 15. Motor; 16. Positioning rod; 17. Sealing gasket; 18. Rotating column; 19. Rotating shaft two; 20. Connecting... 21. Connecting rod; 22. Rotating shaft three; 23. Piston rod one; 24. Spring one; 25. Piston chamber; 26. Air inlet; 27. L-shaped rod; 28. Grinding column; 29. ​​Grinding wheel; 30. Electric push rod one; 31. Electric wheel; 32. Electric push rod two; 33. Sleeve; 34. Piston housing; 35. Piston rod two; 36. Spring two; 37. Sensor; 38. Cylinder one; 39. Cylinder two. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figures 1-9 The present invention provides a technical solution: a gas cylinder air tightness detection device, including a base 1, a clamping and rotating structure is provided at the upper end of the base 1, a gas cylinder 2 is clamped on the clamping and rotating structure, a lifting structure is provided at the upper end of the base 1, a sealing shell 3 is installed on the lifting structure and sleeved on the outer side wall of the gas cylinder 2, and a pressure sensing structure is installed at the upper end of the sealing shell 3.

[0033] Four airbag shells 4 are arranged in a circular array on the bottom of the inner cavity of the sealing shell 3, and each airbag shell 4 can slide towards the sealing shell 3. An airbag 5 is fixedly connected inside the cavity of the airbag shell 4. Four arc-shaped strips 7 are abutted on 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 near the sealing shell 3. Four air inlet pipes 6 are slidably connected to the outer wall of the sealing shell 3 and communicate with the airbags 5 at the corresponding positions. The air inlet pipes 6 can be connected to the inflation pipe from the outside to inflate and deflate the airbags 5.

[0034] A connecting pipe 8 is fixedly connected to the upper end of the airbag 5 near the sealing shell 3. Two non-contact positioning plates 9 are rotatably connected to the upper end of the connecting pipe 8. A cylindrical airbag 10 is fixedly installed between the two positioning plates 9. A rotating ring 11 is rotatably connected to the inner wall of the positioning plate 9 near the connecting pipe 8. A rotating column 18 is rotatably connected to the inner wall of the rotating ring 11. An L-shaped rod 26 is fixedly connected to the side of the rotating column 18 away from the connecting pipe 8. 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. Several teeth 29 are circumferentially arranged on the outer wall of the grinding wheel 28. A rotating structure is provided 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. The positioning plate 9 near the sliding plate 14 is in a sealed state, preventing air leakage from the cylindrical airbag 10. (Reference) Figure 9 The lower positioning piece 9 is divided 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 will rotate, while the rotating ring 11 will always remain in the original position. The airbag 5 can fill the gap between each airbag 5 when it expands.

[0035] A drive structure is provided at the end of the cylindrical airbag 10 away from the connecting tube 8, and the drive structure can drive the cylindrical airbag 10 to rotate.

[0036] For details, please refer to Figure 2 The airbag shell 4 and the arc-shaped strips 7 are arranged in a neat row along the circumference of the sealing shell 3. However, relative to the airbag shell 4, each arc-shaped strip 7 is located between two airbag shells 4, and the gap between two arc-shaped strips 7 is located at the center of the airbag 5. The connecting tube 8 is also located at the center of the airbag 5. When the airbag 5 is inflated, the cylindrical airbag 10 will also inflate. (Refer to...) Figure 3The air bladder 5 is in a full state. The cylindrical air bladder 10 is located at the upper end of the side of the air bladder 5 near the sealing shell 3. When the air bladder 5 is full, it will drive the cylindrical air bladder 10 to fit against the sealing shell 3. At the same time, the full expansion of the cylindrical air bladder 10 will make contact with the outer wall of the sealing shell 3. When the driving structure drives the cylindrical air bladder 10 to rotate, it will scrape the outer surface of the sealing shell 3. At the same time, if there is a dent on the surface of the gas cylinder 2, the cylindrical air bladder 10 can also be embedded in the dent for cleaning, thereby removing the dust from 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 begin to deflate. At this time, the sealing gasket 17 is pushed to fit against the outer wall of the sealing shell 3. The cylindrical airbag 10 is then positioned between the two sealing gaskets 17. The cylindrical airbag 10 is in a deflated state. By rotating the cylindrical airbag 10, the deflated cylindrical airbag 10 will strike the outer wall of the sealing gasket 17, thereby achieving self-cleaning of the cylindrical airbag 10. After the cylindrical airbag 10 has finished self-cleaning, 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 caused by clamping the sealing shell 3.

[0038] The driving structure includes a sliding plate 14, which 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. A rotating shaft 13 is rotatably connected to one side of the plum blossom piece 12. One end of the rotating shaft 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 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 an airbag shell 4 at the corresponding position. The rotating shaft 13 is driven to rotate by the motor 15, and the rotating shaft 13 then drives the two positioning pieces 9 and the cylindrical airbag 10 to rotate.

[0039] The pressure sensing structure includes a piston shell 34, which is fixed to the upper end of the sealing shell 3. A piston rod 35 is slidably connected to the inner wall of the piston shell 34. A spring 36 is sleeved on the outer wall of the piston rod 35. A sensor 37 is fixed to the upper end of the piston shell 34. When the pressure inside the sealing shell 3 increases due to gas leakage in the gas cylinder 2, it will push the piston rod 35 to slide upward, thereby contacting the sensor 37 to determine whether each area of ​​the gas cylinder 2 is leaking.

[0040] The rotating structure includes a second rotating shaft 19, which is fixed to the lower surface of the rotating column 18 away from the central axis. A connecting rod 20 is fixed to the outer wall of the second rotating shaft 19. A third rotating shaft 21 is fixed to the end of the connecting rod 20 away from the second rotating shaft 19. A piston rod 22 is fixed to the side of the third rotating shaft 21 away from the connecting rod 20.

[0041] The airbag shell 4 has a piston chamber 24 on the side near the piston rod 22, and the piston chamber 24 is slidably connected to the piston rod 22. A spring 23 is fixed between the piston rod 22 and the bottom of the inner cavity of the piston chamber 24. An air inlet 25 communicating with the airbag 5 is provided on the inner wall of the piston chamber 24.

[0042] For details, please refer to Figure 8 When the airbag 5 is filled with airflow, the airflow enters the piston chamber 24 through the air inlet 25, simultaneously pushing the spring 23 to slide to the right. When the spring 23 slides to the right, it pushes the rotating shaft 19 to rotate around the rotating column 18, positioning the rotating shaft 19 closest to the connecting pipe 8. At this time, the L-shaped rod 26 rotates, pushing the grinding wheel 28 to contact the outer wall of the rotating shaft 13. When the rotating shaft 13 rotates, it contacts the teeth 29 on the outer surface of the grinding wheel 28. The teeth 29 increase the contact area with the rotating shaft 13, thereby driving the grinding wheel 28 to rotate through the rotation of the rotating shaft 13. During the rotation of the grinding wheel 28, the inner wall of the grinding wheel 28 will contact the outer wall of the grinding column 27. Friction generates heat. Simultaneously, when the tooth 29 contacts the rotating shaft 13, the grinding wheel 28 is pushed, increasing its contact with the interior of the grinding column 27, thus enhancing the friction effect. The heat generated by friction causes the air volume inside the cylindrical air bladder 10 to increase, resulting in a slight expansion of the cylindrical air bladder 10. This expansion is different from continuously filling the cylindrical air bladder 10 with gas; it is more gradual and prevents the cylindrical air bladder 10 from bursting, thereby improving the cleaning effect of the cylindrical air bladder 10 on the outer surface of the gas cylinder 2. Then, when the gas inside the air bladder 5 is expelled, it is elastically reset by the spring 23, causing the rotating shaft 19 to be pulled away from the connecting pipe 8. At this point, refer 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, it cleans the surface by rotating and impacting one side of the sealing gasket 17. Wrinkles are easily formed at the deflated and drooping position. Dust is easily embedded in these wrinkles. When the wrinkles pass 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 wheel tooth 29. At the same time, the wrinkles will constantly bounce, thereby partially smoothing the cylindrical airbag 10 and pushing out the dust inside through the bounce.

[0043] The clamping and rotating structure includes four electric push rods 30, which are arranged in a circular array around the center of the base 1 on the upper end of the base 1. Each electric push rod 30 has an electric wheel 31 fixedly connected to its output end, and the electric wheel 31 can contact the outer wall of the gas cylinder 2. The gas cylinder 2 is clamped by the electric wheel 31 while being rotated, so that the cylindrical air bag 10 can make uniform contact with the outer wall of the gas cylinder 2.

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

[0045] The inner cavity bottom of the sealing shell 3 is equipped with four cylinders 38 in a circumferential 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 equipped with four cylinders 39 in a circumferential array, and the output end of each cylinder 39 is fixedly connected to the arc-shaped strip 7 at the corresponding position.

[0046] Working principle: The worker first clamps the gas cylinder 2 between four electric wheels 31. Then, the electric push rod 32 drives the sealing shell 3 to descend continuously. After descending to a suitable height, the gas bladder 5 and the cylindrical gas bladder 10 are inflated, causing the cylindrical gas bladder 10 to contact the outer wall of the gas cylinder 2. Then, the motor 15 drives the cylindrical gas bladder 10 to rotate and scrape and clean the outer wall of the gas cylinder 2. At the same time, the electric wheels 31 drive the gas cylinder 2 to rotate, thus cleaning a large area of ​​the gas cylinder 2. During the cleaning process, the grinding wheel 28 rotates outside the grinding column 27 to heat the cavity of the cylindrical gas bladder 10, improving the expansion effect of the cylindrical gas bladder 10. Finally, after cleaning, the gas cylinder 2 is deflated. The deflation of the bladder 5 and the cylindrical air bladder 10 causes the cylindrical air bladder 10 to deflate. Then, the sealing gasket 17 moves to clamp and seal the gas cylinder 2. At this time, the deflated cylindrical air bladder 10 is used to pump one end of the sealing gasket 17 to clean the cylindrical air bladder 10 itself. At the same time, the grinding wheel 28 is used to clean the wrinkles of the deflated cylindrical air bladder 10 by vibration. Then, the secondary expansion of the cylindrical air bladder 10 fills the gap between the sealing gaskets 17. At the same time, the air bladder 5 expands and abuts against each other and contacts the outer wall of the gas cylinder 2, further improving the sealing effect and solving the gap caused by clamping and sealing. Finally, the air pressure sensing structure detects whether there is any leakage between the nozzle and the cylinder body.

[0047] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A gas cylinder airtightness testing 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) is installed on the outer side wall of the gas cylinder (2). The upper end of the sealing shell (3) is provided with a pressure sensing structure. The inner cavity bottom of the sealing shell (3) has four airbag shells (4) arranged in a circular array, and each airbag shell (4) can slide towards the sealing shell (3). An airbag (5) is fixedly connected inside 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 towards the sealing shell (3). A sealing gasket (17) is fixedly connected to the side of each arc-shaped strip (7) near the sealing shell (3). Four air inlets (6) connected to the corresponding airbags (5) are slidably connected to the outer wall of the sealing shell (3). The upper end of the airbag (5) near the sealing shell (3) is fixedly connected to a connecting tube (8). The upper end of the connecting tube (8) is rotatably connected to two non-contact positioning plates (9). A cylindrical airbag (10) is fixedly installed between the two positioning plates (9). A rotating ring (11) is rotatably connected to the inner wall of the positioning plate (9) near the connecting tube (8). A rotating column (18) is rotatably connected to the inner wall of the rotating ring (11). An L-shaped rod (26) is fixedly connected to the side of the rotating column (18) away from the connecting tube (8). 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). Several teeth (29) are installed in a circumferential array on the outer wall of the grinding wheel (28). A rotating structure is provided 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. The cylindrical airbag (10) is provided with a driving structure at the end away from the connecting tube (8), and the driving structure can drive the cylindrical airbag (10) to rotate.

2. The gas cylinder airtightness testing device according to claim 1, characterized in that: The drive structure includes a sliding plate (14), which 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). A rotating shaft (13) is rotatably connected to one side of the plum blossom piece (12). One end of the rotating shaft (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 (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 an airbag shell (4) at the corresponding position.

3. The gas cylinder airtightness testing device according to claim 1, characterized in that: The air pressure sensing structure includes a piston shell (34), which is fixed to the upper end of the sealing shell (3). A piston rod (35) is slidably connected to the inner wall of the piston shell (34). A spring (36) is sleeved on the outer wall of the piston rod (35). A sensor (37) is fixed to the upper end of the piston shell (34).

4. The gas cylinder airtightness testing device according to claim 1, characterized in that: The rotating structure includes a second rotating shaft (19), which is fixed to the lower surface of the rotating column (18) away from the central axis. A connecting rod (20) is fixed to the outer side wall of the second rotating shaft (19). A third rotating shaft (21) is fixed to the end of the connecting rod (20) away from the second rotating shaft (19). A piston rod (22) is fixed to the side of the third rotating shaft (21) away from the connecting rod (20).

5. The gas cylinder airtightness testing device according to claim 4, characterized in that: The airbag shell (4) has a piston chamber (24) on the side near the piston rod (22), and the piston chamber (24) is slidably connected to the piston rod (22). A spring (23) is fixed between the piston rod (22) and the bottom of the inner cavity of the piston chamber (24). An air inlet (25) communicating with the airbag (5) is provided on the inner wall of the piston chamber (24).

6. The gas cylinder airtightness testing device according to claim 1, characterized in that: The clamping and rotating structure includes four electric actuators (30), which are arranged in a circular array around the center of the base (1) and mounted on the upper end of the base (1). Each of the electric actuators (30) has an electric wheel (31) fixed to its output end, and the electric wheel (31) can abut against the outer wall of the gas cylinder (2).

7. The gas cylinder airtightness testing device according to claim 1, characterized in that: The lifting structure includes an electric actuator (32), which is fixed to the upper end of the base (1). The output end of the electric actuator (32) is fixed to a sleeve (33), which is sleeved on the outer wall of the sealing shell (3).

8. The gas cylinder airtightness testing device according to claim 1, characterized in that: The inner cavity bottom of the sealing shell (3) is equipped with four cylinders (38) arranged in a circumferential 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 equipped with four cylinders (39) arranged in a circumferential 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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