Gas cylinder airtightness detection method and device

Abstract

The invention discloses a gas cylinder airtightness detection method and device, and relates to the field of gas cylinder detection, based on the gas cylinder airtightness detection device, the method comprises the following steps: S1, placing a gas cylinder in a sealed container, and controlling a sealing element A to block an area between the top of the sealed container and the outer side wall of the neck of the gas cylinder; s2, a top opening of the gas cylinder is blocked by a blocking plug, and helium is conveyed to the inner side of the sealing container, the outer side of the gas cylinder and the area located at the bottom of the sealing piece A through a helium conveying mechanism; s3, gas in the gas cylinder is extracted through a gas extracting pump, and whether helium exists or not is detected through a helium mass spectrometer; according to the gas cylinder airtightness detection method and device, the sealed container is arranged, the gas cylinder is placed in the sealed container, and only the helium needs to be filled in the area between the inner side of the sealed container and the outer side of the gas cylinder during detection, so that the filling amount of the helium can be effectively reduced, the time consumed for filling a large amount of helium is shortened, and the detection efficiency is improved. And the detection efficiency is effectively improved.

Description

Technical Field

[0001] The invention relates to a gas cylinder detection technology, and in particular to a gas cylinder air tightness detection method and device. Background Art

[0002] Gas cylinder air tightness testing mainly involves a series of tests on gas cylinders to ensure that their sealing performance meets safety standards. This process includes the use of special testing equipment and methods to ensure that the gas cylinder can maintain its internal pressure under various conditions, thereby ensuring safe use.

[0003] When testing existing gas cylinders, helium is filled into the cylinder, and then a suction gun is used to scan and detect the outside of the cylinder. When the suction gun is facing the leak hole, the helium is sucked into the mass spectrometer chamber of the leak detector along with the surrounding air, thereby generating a leak indication, thereby achieving the purpose of leak detection on the cylinder body. However, when testing gas cylinders in batches, each cylinder needs to be filled with helium, which takes a long time and consumes a large amount of helium, resulting in a high detection cost. Summary of the invention

[0004] The purpose of the present invention is to provide a method and device for detecting the air tightness of a gas cylinder to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above object, the present invention provides the following technical solution: a method for detecting air tightness of a gas cylinder, based on a gas cylinder air tightness detection device, comprising the following steps:

[0006] S1. Place the gas cylinder in a sealed container and operate the sealing member A to seal the area between the top of the sealed container and the outer wall of the neck of the gas cylinder;

[0007] S2, plugging the top opening of the gas cylinder with a sealing plug, and delivering helium to the area inside the sealed container, outside the gas cylinder and located at the bottom of the A seal through the helium delivery mechanism;

[0008] S3, the vacuum pump extracts the gas inside the gas cylinder, and the helium mass spectrometer detects whether there is helium;

[0009] S4, if the helium mass spectrometer does not detect helium, the gas cylinder is not leaking. If the helium mass spectrometer detects helium, the space between the outer side of the gas cylinder and the inner side of the sealed container is separated by one of the B seals, and helium is first delivered to one of the separated spaces, and the vacuum pump extracts the gas inside the gas cylinder, and the helium mass spectrometer detects whether there is helium. If helium is continuously detected, the process proceeds to step S5. If helium is not continuously detected, helium is delivered to the other separated space, and the helium mass spectrometer detects whether there is helium.

[0010] S5. Move the two B seals to compress the space separated when helium is detected, and the helium mass spectrometer detects whether there is helium. If the helium mass spectrometer continues to detect helium, the space compressed by the two B seals is the area where the gas cylinder is leaking.

[0011] A gas cylinder air tightness detection device, applicable to the gas cylinder air tightness detection method described above, comprising: a sealed container, an A sealing member, two B sealing members, a sealing plug, an air extraction pump, a helium mass spectrometer, a helium gas delivery mechanism and a mobile drive mechanism;

[0012] A sealing member is arranged at the top of the sealed container, and is used to seal the area between the top of the sealed container and the outer side wall of the neck of the gas bottle;

[0013] The two B seals are both arranged on the inner side of the sealed container, and the two B seals are used to separate the space between the outer side of the gas cylinder and the inner side of the sealed container;

[0014] The sealing plug is used to seal the top opening of the gas cylinder, and an airway is opened on the sealing plug. The top of the airway is connected to the air inlet end of the vacuum pump through a pipeline, and the air outlet pipe of the vacuum pump is connected to the air inlet end of the helium mass spectrometer through the pipeline;

[0015] The bottoms of the two B seals are connected to a moving drive mechanism, and the moving drive mechanism is used to drive the two B seals to move along the length direction of the sealed container;

[0016] The helium delivery mechanism is used to deliver helium to an area inside the sealed container, outside the gas cylinder and located at the bottom of the A seal.

[0017] Furthermore, the A seal includes a sealing plate symmetrically slidably installed on the top of the sealed container, an arc groove is provided on the side where the two sealing plates are close to each other, an arc-shaped airbag is fixedly installed inside the arc groove, one side of the arc-shaped airbag is connected to an A gas supply component for conveying gas into the interior thereof, and the two sealing plates are connected to a B moving drive component that drives them to move radially along the sealed container on the side away from each other.

[0018] Furthermore, the A gas transmission component includes a cylinder, one side of the cylinder is connected to an A tube, the end of the A tube away from the cylinder passes through a sealing plate on one side thereof and is connected to the interior of the arc-shaped airbag, a piston is slidably connected to the inside of the cylinder, and one side of the piston is fixedly connected to an A moving drive component that drives it to move along the length direction of the cylinder.

[0019] Furthermore, the B seal includes an annular plate, an annular groove is formed on the inner side of the annular plate, an annular airbag is fixedly installed inside the annular groove, and one side of the annular airbag is connected to a B gas supply component for supplying gas to the inside thereof.

[0020] Furthermore, the B gas delivery component includes a small air pump, the output end of which is connected to a B tube, which passes through the bottom of the sealed container and the annular plate and is connected to the interior of the annular airbag.

[0021] Furthermore, the outer side wall of the B tube connected to the annular airbag located at the upper part is slidably connected to the annular plate located at the bottom.

[0022] Furthermore, the helium delivery mechanism includes two groups of gas delivery components, the gas delivery components include a gas delivery pump, the input end of the gas delivery pump is connected to an external compression tank storing helium through a pipeline, and the output end of the gas delivery pump is connected to a telescopic tube, one end of the telescopic tube in one group of gas delivery components passes through the bottom of the sealed container and two annular plates, and the top end of the telescopic tube is fixedly connected to the annular plate located at the upper part, and the outer side wall of the telescopic tube is slidably connected to the annular plate located at the lower part and the bottom of the sealed container respectively.

[0023] Further, the mobile drive mechanism includes two groups of mobile components, and the mobile components include two C telescopic driving members, wherein the moving ends of the two C telescopic driving members in one group of mobile components respectively penetrate the bottom of the sealed container and are fixedly connected to the bottom of the annular plate located at the bottom, and the moving ends of the two C telescopic driving members are respectively slidably connected to the bottom of the sealed container;

[0024] The moving ends of the two C telescopic driving members in the other group of moving components respectively penetrate the bottom of the sealed container and the annular plate located at the bottom, and are fixedly connected to the bottom of the annular plate located at the top, and the outsides of the moving ends of the two C telescopic driving members are respectively slidably connected to the bottom of the sealed container and the annular plate located at the bottom.

[0025] Furthermore, a bearing platform is fixedly installed at the bottom of the inner cavity of the sealed container, the bearing platform is used to bear the gas cylinder, and the side wall of the bearing platform is arranged in a hollow shape.

[0026] Compared with the prior art, the present invention provides a method and device for detecting the air tightness of a gas cylinder. By providing a sealed container, the gas cylinder is placed inside the sealed container. During the detection, only the area between the inner side of the sealed container and the outer side of the gas cylinder needs to be filled with helium, thereby effectively reducing the filling amount of helium and reducing the time consumed by filling a large amount of helium, thereby effectively improving the detection efficiency.

[0027] By providing two B seals, the two B seals divide the space inside the sealed container and outside the gas cylinder. The two B seals move and continuously compress the space under the drive of the moving drive mechanism. When the vacuum pump sucks the air inside the gas cylinder and detects it through a helium mass spectrometer, the leaking area of ​​the gas cylinder is determined based on whether helium is continuously detected, thereby accurately obtaining the leaking area of ​​the gas cylinder, improving detection efficiency and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0029] Figure 1 A schematic diagram of the overall external structure provided by an embodiment of the present invention;

[0030] Figure 2 A first partial cross-sectional structural schematic diagram provided by an embodiment of the present invention;

[0031] Figure 3 The embodiment of the present invention provides Figure 2 A is an enlarged schematic diagram;

[0032] Figure 4 A schematic diagram of a first partial three-dimensional structure provided by an embodiment of the present invention;

[0033] Figure 5 A schematic diagram of a second partial three-dimensional structure provided by an embodiment of the present invention;

[0034] Figure 6 A second partial cross-sectional structural schematic diagram provided by an embodiment of the present invention;

[0035] Figure 7 A third partial cross-sectional structural schematic diagram provided for an embodiment of the present invention.

[0036] Description of reference numerals:

[0037] 1. Sealed container; 2. A seal; 21. Sealing plate; 22. Arc-shaped airbag; 23. Cylinder; 24. A tube; 25. Piston; 26. A movable drive member; 27. B movable drive member; 3. B seal; 31. Annular plate; 32. Annular airbag; 33. Small air pump; 34. B tube; 4. Sealing plug; 5. Vacuum pump; 6. Helium mass spectrometer; 7. Helium delivery mechanism; 71. Air delivery pump; 72. Telescopic tube; 8. C telescopic drive member. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] Embodiment 1:

[0040] See also Figure 1 to Figure 2 A method for detecting air tightness of a gas cylinder is provided, based on a gas cylinder air tightness detection device, and comprises the following steps:

[0041] S1. Place the gas cylinder in the sealed container 1, and operate the A sealing member 2 to seal the area between the top of the sealed container 1 and the outer wall of the neck of the gas cylinder;

[0042] S2, sealing the top opening of the gas cylinder with the sealing plug 4, and delivering helium to the area inside the sealed container 1, outside the gas cylinder and located at the bottom of the A sealing member 2 through the helium delivery mechanism 7;

[0043] S3, the vacuum pump 5 extracts the gas inside the gas cylinder, and the helium mass spectrometer 6 detects whether there is helium;

[0044] S4, if the helium mass spectrometer 6 does not detect helium, the gas cylinder is not leaking. If the helium mass spectrometer 6 detects helium, the space between the outer side of the gas cylinder and the inner side of the sealed container 1 is separated by one of the B seals 3, and helium is first delivered to one of the separated spaces, the vacuum pump 5 extracts the gas inside the gas cylinder, and the helium mass spectrometer 6 detects whether there is helium. If helium is continuously detected, the process proceeds to step S5. If helium is not continuously detected, helium is delivered to the other separated space, and the helium mass spectrometer 6 detects whether there is helium.

[0045] S5. Move the two B seals 3 to compress the space separated when helium is detected, and the helium mass spectrometer 6 detects whether there is helium. If the helium mass spectrometer 6 continues to detect helium, the space compressed by the two B seals 3 is the area where the gas cylinder is leaking.

[0046] Embodiment 2:

[0047] See also Figures 1 to 7 , a gas cylinder air tightness detection device, suitable for the above-mentioned gas cylinder air tightness detection method, comprising: a sealed container 1, an A sealing member 2, two B sealing members 3, a sealing plug 4, an air pump 5, a helium mass spectrometer 6, a helium gas delivery mechanism 7 and a mobile drive mechanism;

[0048] A sealing member 2 is disposed at the top of the sealed container 1, and is used to seal the area between the top of the sealed container 1 and the outer wall of the neck of the gas bottle;

[0049] The two B seals 3 are both arranged on the inner side of the sealed container 1, and the two B seals 3 are used to separate the space between the outer side of the gas cylinder and the inner side of the sealed container 1;

[0050] The sealing plug 4 is used to seal the top opening of the gas cylinder, and an airway is opened on the sealing plug 4. The top of the airway is connected to the air inlet end of the vacuum pump 5 through a pipeline, and the air outlet pipe of the vacuum pump 5 is connected to the air inlet end of the helium mass spectrometer 6 through a pipeline;

[0051] The bottoms of the two B seals 3 are connected to a moving drive mechanism, and the moving drive mechanism is used to drive the two B seals 3 to move along the length direction of the sealed container 1;

[0052] The helium delivery mechanism 7 is used to deliver helium to the area inside the sealed container 1 , outside the gas cylinder and located at the bottom of the A sealing member 2 .

[0053] When the gas cylinder is tested by the existing sniffing gun method, the gas cylinder needs to be filled with helium, and then the outside of the gas cylinder is scanned and detected by the sniffing gun. When the sniffing gun is facing the leak hole, the helium is sucked into the mass spectrometer chamber of the leak detector together with the surrounding air, thereby generating a leak indication, achieving the purpose of leak detection on the gas cylinder body. However, when testing the gas cylinders in batches, each gas cylinder needs to be filled with helium, which takes a long time and consumes a large amount of helium, resulting in a high detection cost.

[0054] To this end, by providing a sealed container 1, the gas cylinder is placed inside the sealed container 1. During detection, only the area between the inner side of the sealed container 1 and the outer side of the gas cylinder needs to be filled with helium, thereby effectively reducing the amount of helium filled and reducing the time consumed by the need for a large amount of helium filling, thereby effectively improving the detection efficiency;

[0055] Two B seals 3 are provided, and the two B seals 3 divide the space inside the filling and sealing container 1 and outside the gas cylinder. The two B seals 3 move and continuously compress the space under the drive of the moving drive mechanism. When the air inside the gas cylinder is sucked by the vacuum pump 5 and detected by the helium mass spectrometer 6, the leakage area of ​​the gas cylinder is determined according to whether helium is continuously detected, so that the leakage area of ​​the gas cylinder can be accurately obtained, the detection efficiency is improved, and the cost is saved.

[0056] In one embodiment of the present invention, the A sealing member 2 comprises a sealing plate 21 symmetrically slidably mounted on the top of the sealed container 1, an arc groove is provided on the side where the two sealing plates 21 are close to each other, an arc-shaped airbag 22 is fixedly mounted inside the arc groove, one side of the arc-shaped airbag 22 is connected to an A gas delivery component for delivering gas to the inside thereof, and the two sealing plates 21 are connected to a B moving driving member 27 for driving them to move radially along the sealed container 1 on the side away from each other;

[0057] When working, the B moving driving member 27 is a telescopic cylinder or a hydraulic cylinder. The B moving driving member 27 is fixedly installed on the outside of the sealed container 1. The moving end of the B moving driving member 27 is fixedly connected to the adjacent sealing plate 21. Under the drive of the B moving driving member 27, the two sealing plates 21 move toward each other to seal the top of the sealed container 1.

[0058] In one embodiment of the present invention, the A gas delivery assembly includes a cylinder 23, which is fixedly mounted on the sealing plate 21 through a bracket, and one side of the cylinder 23 is connected to an A tube 24, and one end of the A tube 24 away from the cylinder 23 passes through the sealing plate 21 on one side thereof and is connected to the inside of the arc-shaped airbag 22, and a piston 25 is slidably connected inside the cylinder 23, and one side of the piston 25 is fixedly connected to an A moving driving member 26 that drives it to move along the length direction of the cylinder 23, and the A moving driving member 26 is a telescopic cylinder or a hydraulic cylinder, and the A moving driving member 26 is fixedly mounted on the sealing plate 21, and the telescopic end of the A moving driving member 26 is fixedly connected to the piston 25;

[0059] During operation, the contraction of the A moving drive member 26 drives the piston 25 to move. The movement of the piston 25 presses the gas in the cylinder 23 into the arc-shaped airbag 22 through the A tube 24. The arc-shaped airbag 22 expands to seal the contact area between the sealing plate 21 and the neck of the gas bottle to prevent helium leakage.

[0060] In one embodiment of the present invention, the B sealing member 3 includes an annular plate 31, an annular groove is formed on the inner side of the annular plate 31, an annular airbag 32 is fixedly installed inside the annular groove, a B gas delivery component for delivering gas to the inside of the annular airbag 32 is connected to one side of the annular airbag 32, and the B gas delivery component includes a small air pump 33, and the output end of the small air pump 33 is connected to a B tube 34, the B tube 34 passes through the bottom of the sealed container 1 and the annular plate 31 and is connected to the inside of the annular airbag 32, the outer side wall of the B tube 34 connected to the annular airbag 32 located at the upper part is slidably connected to the annular plate 31 located at the bottom, and the outer side walls of the two B tubes 34 are both slidably connected to the bottom of the sealed container 1;

[0061] The B tube 34 is composed of a metal bellows and a hard tube, so that the annular plate 31 does not interfere with the gas supply to the annular airbag 32 when it moves;

[0062] During operation, air is supplied to the inside of the B tube 34 through a small air pump 33, and then supplied to the annular air bag 32 through the transport of the B tube 34. The annular air bag 32 expands and fits closely to the outer wall of the gas cylinder, thereby cooperating with the annular plate 31 to divide the area inside the sealed container 1 and outside the gas cylinder, and a sealing ring can be fixedly installed on the side of the annular plate 31 close to the inner wall of the sealed container 1, so as to improve the dividing and sealing effect of the B seal 3 on the area inside the sealed container 1 and outside the gas cylinder.

[0063] In one embodiment of the present invention, the helium delivery mechanism 7 includes two groups of gas delivery components, the gas delivery components include a gas delivery pump 71, the input end of the gas delivery pump 71 is connected to an external compression tank storing helium through a pipeline, and the output end of the gas delivery pump 71 is connected to a telescopic tube 72, one end of the telescopic tube 72 in one group of gas delivery components penetrates the bottom of the sealed container 1 and the two annular plates 31, and the top end of the telescopic tube 72 is fixedly connected to the annular plate 31 located at the upper part, and the outer side wall of the telescopic tube 72 is respectively slidably connected to the annular plate 31 located at the lower part and the bottom of the sealed container 1;

[0064] During operation, due to the provision of two sets of gas delivery components, helium can be delivered to the top and lower areas of the upper B seal 3 through the two sets of gas delivery pumps 71 and the telescopic tube 72. Initially, before the annular airbag 32 in the bottom B seal 3 is expanded, the annular airbag 32 in the top B seal 3 is expanded, and then the helium is delivered to the lower area of ​​the top B seal 3 through the gas delivery pump 71 and the telescopic tube 72, so that the lower section and the bottom position of the gas cylinder can be leak-checked. The telescopic tube 72 is provided to prevent the delivery of helium from being interfered with when the annular plate 31 moves.

[0065] In one embodiment of the present invention, the mobile driving mechanism includes two groups of mobile components, and the mobile components include two C telescopic driving members 8, wherein the moving ends of the two C telescopic driving members 8 in one group of mobile components respectively penetrate the bottom of the sealed container 1 and are fixedly connected to the bottom of the annular plate 31 located at the bottom, and the moving ends of the two C telescopic driving members 8 are respectively slidably connected to the bottom of the sealed container 1;

[0066] The moving ends of the two C telescopic driving members 8 in the other group of moving components respectively penetrate the bottom of the sealed container 1 and the annular plate 31 at the bottom, and are fixedly connected to the bottom of the annular plate 31 at the top, and the outer parts of the moving ends of the two C telescopic driving members 8 are respectively slidably connected to the bottom of the sealed container 1 and the annular plate 31 at the bottom, and the C telescopic driving member 8 is a telescopic cylinder or a hydraulic cylinder;

[0067] During operation, the annular plate 31 is driven to move along the inner wall of the sealed container 1 by the extension and contraction of the C telescopic driving members 8 in the two groups of moving components, thereby realizing the movement of the two B sealing members 3 along the length direction.

[0068] In one embodiment of the present invention, a support platform is fixedly installed at the bottom of the inner cavity of the sealed container 1, and the support platform is used to support the gas cylinder. The side wall of the support platform is hollowed out to allow helium to flow to the bottom of the gas cylinder.

[0069] In one embodiment of the present invention, a mounting bracket is provided, and the C telescopic drive member 8, the sealed container 1, the vacuum pump 5 and the helium mass spectrometer 6 are all fixedly mounted on the mounting bracket.

[0070] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A method for detecting air tightness of a gas cylinder, characterized in that: Based on the gas cylinder air tightness detection device, the following steps are included: S1. Place the gas cylinder in the sealed container (1), and operate the A sealing member (2) to seal the area between the top of the sealed container (1) and the outer wall of the neck of the gas cylinder; S2, sealing the top opening of the gas cylinder with a sealing plug (4), and delivering helium to the area inside the sealed container (1), outside the gas cylinder and located at the bottom of the A sealing member (2) through the helium delivery mechanism (7); S3, the air pump (5) extracts the gas inside the gas cylinder, and the helium mass spectrometer (6) detects whether there is helium; S4, if the helium mass spectrometer (6) does not detect the presence of helium, the gas cylinder is not leaking. If the helium mass spectrometer (6) detects the presence of helium, the space between the outer side of the gas cylinder and the inner side of the sealed container (1) is separated by one of the B seals (3), and helium is first delivered to one of the separated spaces, the vacuum pump (5) extracts the gas inside the gas cylinder, and the helium mass spectrometer (6) detects whether there is helium. If helium is continuously detected, the process proceeds to step S5. If helium is not continuously detected, helium is delivered to the other separated space, and the helium mass spectrometer (6) detects whether there is helium. S5. Move the two B seals (3) to compress the space separated when helium is detected, and the helium mass spectrometer (6) detects whether there is helium. If the helium mass spectrometer (6) continues to detect the presence of helium, the space compressed by the two B seals (3) is the area where the gas cylinder is leaking.

2. A gas cylinder air tightness detection device, characterized in that: A method for detecting air tightness of a gas cylinder applicable to the above-mentioned claim 1, comprising: a sealed container (1), an A sealing member (2), two B sealing members (3), a sealing plug (4), an air extraction pump (5), a helium mass spectrometer (6), a helium gas delivery mechanism (7) and a mobile drive mechanism; A sealing member (2) is arranged at the top of the sealed container (1) and is used to seal the area between the top of the sealed container (1) and the outer wall of the neck of the gas bottle; The two B seals (3) are both arranged on the inner side of the sealed container (1), and the two B seals (3) are used to separate the space between the outer side of the gas cylinder and the inner side of the sealed container (1); The sealing plug (4) is used to seal the top opening of the gas cylinder, and an air passage is provided on the sealing plug (4). The top of the air passage is connected to the air inlet end of the air pump (5) through a pipeline, and the air outlet pipe of the air pump (5) is connected to the air inlet end of the helium mass spectrometer (6) through the pipeline; The bottoms of the two B sealing members (3) are connected to a moving drive mechanism, and the moving drive mechanism is used to drive the two B sealing members (3) to move along the length direction of the sealed container (1); The helium delivery mechanism (7) is used to deliver helium to the area inside the sealed container (1), outside the gas cylinder and located at the bottom of the A sealing member (2).

3. A gas cylinder air tightness detection device according to claim 2, characterized in that: The A sealing member (2) comprises a sealing plate (21) symmetrically slidably mounted on the top of the sealed container (1); a circular arc groove is provided on the side where the two sealing plates (21) are close to each other; a circular arc-shaped air bag (22) is fixedly mounted inside the circular arc groove; a gas delivery component A for delivering gas to the inside of the circular arc-shaped air bag (22) is connected to one side of the circular arc-shaped air bag (22); and a moving driving member B (27) for driving the sealing plates (21) to move radially along the sealed container (1) is connected to the side where the two sealing plates (21) are far away from each other.

4. A gas cylinder air tightness detection device according to claim 3, characterized in that: The A gas delivery assembly comprises a cylinder (23), one side of the cylinder (23) is connected to an A tube (24), one end of the A tube (24) away from the cylinder (23) passes through a sealing plate (21) on one side thereof and is connected to the interior of the arc-shaped air bag (22), a piston (25) is slidably connected to the interior of the cylinder (23), and one side of the piston (25) is fixedly connected to an A moving driving member (26) for driving the piston (25) to move along the length direction of the cylinder (23).

5. A gas cylinder air tightness detection device according to claim 2, characterized in that: The B sealing member (3) comprises an annular plate (31), an annular groove is formed on the inner side of the annular plate (31), an annular air bag (32) is fixedly installed inside the annular groove, and a B gas supply assembly for supplying gas to the inside of the annular air bag (32) is connected to one side of the annular air bag (32).

6. A gas cylinder air tightness detection device according to claim 5, characterized in that: The B gas delivery assembly comprises a small air pump (33), the output end of the small air pump (33) is connected to a B tube (34), the B tube (34) penetrates the bottom of the sealed container (1) and the annular plate (31) and is connected to the inside of the annular air bag (32).

7. A gas cylinder air tightness detection device according to claim 6, characterized in that: The outer side wall of the B tube (34) connected to the annular air bag (32) located at the upper part is slidably connected to the annular plate (31) located at the bottom.

8. A gas cylinder air tightness detection device according to claim 2, characterized in that: The helium delivery mechanism (7) comprises two groups of gas delivery components, the gas delivery components comprising a gas delivery pump (71), the input end of the gas delivery pump (71) being connected to an external compression tank storing helium through a pipeline, and the output end of the gas delivery pump (71) being connected to a telescopic tube (72), wherein one end of the telescopic tube (72) in one group of gas delivery components penetrates the bottom of the sealed container (1) and two annular plates (31), and the top end of the telescopic tube (72) is fixedly connected to the annular plate (31) located at the upper part, and the outer side wall of the telescopic tube (72) is respectively slidably connected to the annular plate (31) located at the lower part and the bottom of the sealed container (1).

9. A gas cylinder air tightness detection device according to claim 2, characterized in that: The mobile drive mechanism comprises two groups of mobile components, and the mobile components comprise two C-type telescopic drive members (8), wherein the mobile ends of the two C-type telescopic drive members (8) in one group of mobile components respectively penetrate the bottom of the sealed container (1) and are fixedly connected to the bottom of the annular plate (31) located at the bottom, and the mobile ends of the two C-type telescopic drive members (8) are respectively slidably connected to the bottom of the sealed container (1); The moving ends of the two C telescopic driving members (8) in the other group of moving components respectively penetrate the bottom of the sealed container (1) and the annular plate (31) located at the bottom, and are fixedly connected to the bottom of the annular plate (31) located at the top, and the outsides of the moving ends of the two C telescopic driving members (8) are respectively slidably connected to the bottom of the sealed container (1) and the annular plate (31) located at the bottom.

10. A gas cylinder air tightness detection device according to claim 2, characterized in that: A bearing platform is fixedly installed at the bottom of the inner cavity of the sealed container (1), the bearing platform is used to bear the gas cylinder, and the side wall of the bearing platform is arranged in a hollow shape.

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