Air tightness detection device and air tightness detection system

Abstract

The utility model discloses an air tightness detection device and an air tightness detection system, relates to the technical field of air tightness detection, and aims to solve the problem of low air tightness detection efficiency of an air spring piston. An embodiment of the utility model provides an air tightness detection device which is used for detecting whether an air spring piston leaks, the air spring piston comprises a first assembly and a second assembly, the first assembly and the second assembly are connected and define an inflation chamber, and the second assembly is provided with a communication hole communicated with the inflation chamber; the air tightness detection device comprises a box body, a first sealing element and a gas detector, the box body is provided with a sealing cavity and a first inflation channel, when the air spring piston is detected to leak, the air spring piston is placed in the sealing cavity, and the first inflation channel injects detection gas into the inflation cavity; the first sealing piece is arranged in the sealing cavity, so that the first inflation channel is hermetically connected with the communicating hole; the gas detector is communicated with the sealing cavity and is used for detecting the content of the detection gas in the sealing cavity.

Description

Technical Field

[0001] This utility model relates to the field of airtightness testing technology, and in particular to an airtightness testing device and an airtightness testing system. Background Technology

[0002] Air spring pistons typically have a sealed chamber to be filled with air, utilizing the compressibility of air to achieve the piston's elasticity. To prevent air leakage from the chamber, the air spring piston usually needs to undergo an airtightness test.

[0003] In related technologies, the air tightness testing equipment for air spring pistons has a relatively complex structure, which makes the operation of air tightness testing for air spring pistons cumbersome, resulting in low air tightness testing efficiency. Utility Model Content

[0004] The purpose of this invention is to provide an airtightness detection device and an airtightness detection system, which aims to solve the problem of low airtightness detection efficiency of air spring pistons.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] According to a first aspect of this application, the present invention provides an airtightness detection device for detecting whether an air spring piston is leaking. The air spring piston includes a first component and a second component, which are connected and define an inflation chamber. The second component has a communication hole communicating with the inflation chamber. The airtightness detection device includes a housing, a first sealing element, and a gas detector. The housing has a sealed cavity and a first inflation channel communicating with the sealed cavity. When detecting whether the air spring piston is leaking, the air spring piston is placed in the sealed cavity, and the first inflation channel communicates with the communication hole to fill the inflation chamber with detection gas. The first sealing element is disposed in the sealed cavity and surrounds the first inflation channel to seal the first inflation channel with the communication hole. The gas detector communicates with the sealed cavity to detect the content of the detection gas in the sealed cavity.

[0007] The airtightness testing device provided in this application, through the arrangement of a housing, a first sealing element, and a gas detector, allows for the detection of external leakage of an air spring piston. The air spring piston is placed inside a sealed cavity, and the first sealing element surrounds the first inflation channel. This first sealing element seals the inner wall of the housing containing the first inflation channel and the outer wall of the air spring piston containing the air intake channel. This ensures a sealed connection between the first inflation channel and the air intake channel, preventing leakage of the detection gas from the connection point when the detection gas is injected into the inflation chamber through the first inflation channel and the air intake channel. Therefore, when testing the airtightness of the air spring piston, it is only necessary to place the air spring inside the sealed cavity, surround the first inflation channel with the first sealing element, and then inject the detection gas into the inflation chamber. The gas content measured by the gas detector is then observed to determine if the air spring piston is leaking. Thus, the airtightness testing device has a simple structure and is easy to operate, thereby improving the efficiency of airtightness testing.

[0008] In some embodiments, the housing includes a body portion and a base portion. The body portion has a sealed cavity and includes a first wall panel. The base portion is disposed in the sealed cavity and connected to the first wall panel. The base portion is used to place an air spring piston. A first inflation channel extends from the outer surface of the first wall panel to the side surface of the base portion opposite to the first wall panel.

[0009] In some embodiments, the first inflation channel includes a first groove and a first channel, the first groove being recessed from the side surface of the base portion facing away from the first wall panel toward the first wall panel, and the first channel extending from the outer surface of the first wall panel to the first groove.

[0010] In some embodiments, the orthographic projection of the first channel portion onto the plane where the first wall panel is located lies within the orthographic projection of the first groove portion onto the plane where the first wall panel is located.

[0011] In some embodiments, a first seal is disposed on the base portion and surrounds the first groove portion. This facilitates the placement of the first seal, which is positioned between the base portion and the air spring piston when detecting whether the air spring piston is leaking.

[0012] In some embodiments, the housing further includes a first limiting portion, which is disposed on the base portion and surrounds the first seal. When detecting whether the air spring piston is leaking, a portion of the air spring piston is located within the first limiting portion.

[0013] In some embodiments, the housing includes a first part and a second part; the airtightness detection device further includes a first lifting assembly connected to the first part for driving the first part to move between a first position and a second position. When the first part is in the first position, the first part is separated from the second part; when the first part is in the second position, the first part and the second part are sealed together to define the sealing cavity.

[0014] In some embodiments, the airtightness testing device further includes a second seal, which is disposed between the first portion and the second portion when the first portion is in the first position.

[0015] In some embodiments, the base portion is connected to the second portion, and the housing further includes a positioning portion connected to the first portion and disposed opposite to the base portion; when detecting whether the air spring piston is leaking, the positioning portion and the base portion clamp and position the air spring piston from opposite ends of the air spring piston.

[0016] In some embodiments, the first component is further provided with an air inlet communicating with the first chamber; the automatic detection scheme further includes a third seal, which is disposed on the positioning part. When detecting whether the air spring piston is leaking, the second seal surrounds the air inlet and is disposed between the positioning part and the air spring piston.

[0017] In some embodiments, the first component includes a first housing; the second component includes a second housing and a partition, the first housing being connected to the second housing to define an inflation chamber, the partition being disposed inside the second housing and connected to the first housing to divide the inflation chamber into a first chamber and a second chamber; the connecting holes include a first connecting hole and a second connecting hole, the first connecting hole connecting to the first chamber and the second connecting hole connecting to the second chamber; when detecting whether the air spring piston is leaking, both the first connecting hole and the second connecting hole are connected to the first inflation channel.

[0018] In some embodiments, the first housing is provided with an installation channel communicating with a second chamber; the first component also includes a valve, which is installed in the installation channel and the valve core is connected to a second communication hole to open or close the second communication hole; when detecting whether the air spring piston is leaking, the valve core opens the second communication hole.

[0019] In some embodiments, the plane where the inlet of the first connecting hole is located and the plane where the inlet of the second connecting hole is located are both located on the first wall surface of the air spring piston. When detecting whether the air spring piston is leaking, the first wall surface faces the side surface of the base portion that is away from the first wall plate.

[0020] In some embodiments, the surface of the first component facing away from the base is also provided with an air inlet that communicates with the inflation chamber; the automatic detection scheme also includes a third seal, which is disposed on the positioning part. When detecting whether the air spring piston is leaking, the third seal surrounds the air inlet and is disposed between the positioning part and the air spring piston.

[0021] According to a second aspect of this application, the present invention provides an airtightness detection system, including an airtightness detection device.

[0022] In some embodiments, the first component includes a first housing; the second component includes a second housing and a partition, the first housing being connected to the second housing to define an inflation chamber, the partition being disposed inside the second housing and connected to the first housing to divide the inflation chamber into a first chamber and a second chamber; the connecting hole includes a first connecting hole and a second connecting hole, the first connecting hole connecting to the first chamber and the second connecting hole connecting to the second chamber; the airtightness detection system further includes an airtightness detection device for detecting whether the air spring piston is internally leaking, the airtightness detection device including a first sealing fixture, a fourth sealing element and a pressure drop detector, the first sealing fixture having a second inflation channel, when detecting whether the air spring piston is internally leaking, the second connecting hole is sealed, the air spring piston is placed on the first sealing fixture, and the second inflation channel is connected to the second connecting hole to inject detection gas into the first chamber; the fourth sealing element is disposed on the first sealing fixture and surrounding the second inflation channel for sealing the second inflation channel with the second connecting hole; the pressure drop detector is connected to the second inflation channel for detecting the pressure in the first chamber.

[0023] In some embodiments, the first sealing fixture includes a first surface and a second surface disposed opposite to each other, the first surface being used to place an air spring piston; the second inflation channel includes a second channel portion and a second groove portion, the second groove portion being recessed from the first surface toward the second surface, and the second channel portion extending from the second surface to the second groove portion.

[0024] In some embodiments, the orthographic projection of the second channel portion on the first surface lies within the orthographic projection of the second groove portion on the first surface.

[0025] In some embodiments, the fourth seal is disposed around the second groove, and when detecting whether the air spring piston is leaking internally, the fourth seal is located between the first surface and the air spring piston.

[0026] In some embodiments, the first sealing fixture further includes a main body and a second limiting part. The main body includes a first surface and a second surface. The second limiting part is connected to the first surface and is disposed around the third seal. When detecting whether the air spring piston is leaking internally, a portion of the air spring piston is located within the second limiting part.

[0027] In some embodiments, the airtightness testing device further includes a second sealing fixture, which is disposed opposite to the first sealing fixture and is used to press the air spring piston onto the first sealing fixture.

[0028] In some embodiments, the airtightness testing device further includes a second lifting assembly connected to a second sealing fixture, which is used to drive the second sealing fixture to move in a direction away from or close to the first sealing fixture.

[0029] In some embodiments, the first housing is provided with an installation channel communicating with a second chamber; the first component also includes a valve, which is installed in the installation channel and the valve core is connected to a second communication hole to open or close the second communication hole; when detecting whether the air spring piston is leaking internally, the valve core closes the second communication hole.

[0030] In some embodiments, the second sealing fixture is provided with a conductive channel for mounting through holes, and the conductive channel is connected to the mounting channel; the airtightness testing device further includes a power supply and a conductive component, the conductive component being connected to the power supply and passing through the conductive channel; part of the conductive component is located within the mounting channel, and when detecting whether the air spring piston has internal leakage, the conductive component is electrically connected to the valve between the first sealing fixture and the second sealing fixture.

[0031] In some embodiments, the first component further includes an air inlet communicating with the first chamber; the airtightness testing device further includes a fifth seal, which is disposed on the second sealing fixture. When testing whether the air spring piston has internal leakage, the fifth seal surrounds the air inlet and is located between the second sealing fixture and the air spring piston.

[0032] In some embodiments, the air tightness testing system further includes a robotic arm for moving an air spring piston from the air tightness testing device to the air tightness testing equipment. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of a dual-cavity air spring provided in an embodiment of this application;

[0035] Figure 2 for Figure 1 A cross-sectional schematic diagram of the air spring piston in the double-chamber air spring shown.

[0036] Figure 3 This is a schematic diagram of the structure of an airtightness detection system provided in an embodiment of this application;

[0037] Figure 4 for Figure 3 The diagram shows the structure of the airtightness testing device in the airtightness testing system.

[0038] Figure 5 for Figure 3 The diagram shows the structure of the airtightness testing equipment in the airtightness testing system.

[0039] Figure label:

[0040] 1000, Double-chamber air spring;

[0041] 100. Rubber airbag; 110. First main chamber; 200. Base;

[0042] 10. Air tightness testing system;

[0043] 1. Air spring piston; 11. First assembly; 111. First housing; 111a. Mounting channel; 111b. Top cover; 111c. Mounting cylinder; 112. Valve; 112a. Valve seat; 112b. Valve body; 112c. Valve core; 113. Air inlet; 12. Second assembly; 121. Connecting hole; 121a. First connecting hole; 121b. Second connecting hole; 122. Second housing; 122a. Bottom wall; 122b. Peripheral wall; 123. Partition; 13. Inflation chamber; 131. First chamber; 132. Second chamber; 14. Sixth seal; 15. Seventh seal;

[0044] 2. Air tightness testing device; 21. Housing; 211. Sealed cavity; 212. First inflation channel; 212a. First groove; 212b. First channel section; 213. Body section; 213a. First wall panel; 213b. First enclosure panel; 214. Base section; 215. First limiting section; 216. First part; 216a. Second wall panel; 216b. Second enclosure panel; 217. Second part; 218. Positioning part; 22. First sealing element; 23. Gas detector; 24. First lifting assembly; 25. Second sealing element; 26. Third sealing element;

[0045] 3. Air tightness testing equipment; 31. First sealing fixture; 311. Second inflation channel; 311a. Second channel section; 311b. Second groove section; 312. First surface; 313. Second surface; 314. Main body section; 315. Second limiting section; 32. Fourth sealing element; 33. Pressure drop detector; 34. Second sealing fixture; 341. Conductive channel; 35. Second lifting assembly; 36. Power supply; 37. Conductive element; 38. Fifth sealing element;

[0046] 4. Robotic arm. Detailed Implementation

[0047] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0048] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or relative positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Unless otherwise specified, the above-mentioned orientational descriptions can be flexibly set in actual application, provided that the relative positional relationship shown in the accompanying drawings is satisfied.

[0049] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0050] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0051] In embodiments of this invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0052] In this embodiment of the invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in this embodiment of the invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0053] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0054] like Figure 1 As shown, Figure 1 This is a schematic diagram of a dual-chamber air spring according to an embodiment of this application. The dual-chamber air spring 1000 includes an air spring piston 1, a rubber air bladder 100, and a base 200. The rubber air bladder 100 is disposed on the base 200. A first main chamber 110 and a first opening communicating with the first main chamber 110 are formed within the rubber air bladder 100. The air spring piston 1 is disposed at the first opening and connected to the rubber air bladder 100. The air spring piston 1 covers the first opening, so that the first main chamber 110 is a closed chamber.

[0055] The air spring piston 1 includes a first component 11 and a second component 12. The first component 11 and the second component 12 are connected and define an inflation chamber 13. The second component 12 is also provided with a communication hole 121 communicating with the inflation chamber 13. The communication hole 121 also communicates with the first main chamber 110 of the rubber airbag 100, so that the first main chamber 110 communicates with the inflation chamber 13.

[0056] The number of air chambers 13 can be one, two, or more than two. This application uses two air chambers 13 as an example for illustration. However, this does not constitute a limitation on the air spring piston 1 of this application.

[0057] Please see Figure 2 and combined Figure 1 , Figure 2 for Figure 1 The diagram shows a cross-sectional view of the air spring piston in a dual-chamber air spring. The first component 11 includes a first housing 111, and the second component 12 includes a second housing 122 and a partition 123. The first housing 111 and the second housing 122 are welded to form an inflation chamber 13. The partition 123 is disposed inside the second housing 122 and welded to the first housing 111 to divide the inflation chamber 13 into a first chamber 131 and a second chamber 132.

[0058] The second component 12 is also provided with a communication hole 121 that communicates with the inflation chamber 13. The communication hole 121 includes a first communication hole 121a and a second communication hole 121b.

[0059] The first connecting hole 121a communicates with the first chamber 131, and the second connecting hole 121b communicates with the second chamber 132. Both the first connecting hole 121a and the second connecting hole 121b communicate with the first main chamber 110 of the rubber airbag 100. This ensures that the first chamber 131 is connected to the first main chamber 110, and the second chamber 132 is also connected to the first main chamber 110. Thus, the connection between the first chamber 131 and the first main chamber 110 forms the main chamber of the dual-chamber air spring 1000, and the second chamber 132 forms the secondary chamber of the dual-chamber air spring 1000. In other words, the first chamber 131 is always connected to the first main chamber 110, while the second chamber 132 can be selectively connected to or disconnected from the first main chamber 110 (i.e., the second connecting hole 121b is blocked).

[0060] Specifically, the first component 11 also includes a valve 112. The valve 112 is used to open or close the second communication port 121b to connect or disconnect the second chamber 132 from the first main chamber 110.

[0061] In some examples, the first housing 111 is provided with an installation channel 111a, and the installation channel 111a communicates with the second chamber 132. Exemplarily, the first housing 111 includes a top cover 111b and an installation cylinder 111c. The second housing 122 includes a bottom wall 122a and a cylindrical peripheral wall 122b. Along the axial direction of the peripheral wall 122b, the bottom wall 122a and the top cover 111b are disposed opposite each other at both ends of the peripheral wall 122b to form an inflatable chamber 13 with the peripheral wall 122b.

[0062] The peripheral wall 122b and the bottom wall 122a can be an integral structure. The top cover 111b is welded to the peripheral wall 122b. For ease of description later, the welding position between the top cover 111b and the peripheral wall 122b is named the first welding position (the first welding position is...). Figure 2 (Middle position X).

[0063] A partition 123 is disposed within the inflation chamber 13 and connects the bottom wall 122a and the top cover 111b, thereby dividing the inflation chamber 13 into a first chamber 131 and a second chamber 132. The partition 123 and the bottom wall 122a can be an integral structure, and the partition 123 is welded to the top cover 111b. For ease of description later, the welding position between the top cover 111b and the partition 123 is referred to as the second welding position (the second welding position is...). Figure 2 (Middle position Y).

[0064] The top cover 111b has a mounting hole connecting the outside to the second chamber 132. The mounting cylinder 111c is located at the mounting hole and connected to the top cover 111b, and is situated within the second chamber 132. The mounting cylinder 111c can be integrally formed with the top cover 111b. The space enclosed by the mounting cylinder 111c is the mounting channel 111a.

[0065] The first component 11 also includes a valve 112. The valve 112 can be an electrically operated valve. The valve 112 is installed within the mounting channel 111a, and its valve core 112c is connected to the second communicating hole 121b to open or close the second communicating hole 121b. Specifically, the valve 112 includes a valve seat 112a, a valve body 112b, and a valve core 112c. The valve seat 112a is fixed within the mounting channel 111a. The valve body 112b is mounted on the valve seat 112a, and the valve core 112c is connected to and movable relative to the valve seat 112a to open or close the second communicating hole 121b.

[0066] In some examples, a sixth seal 14 is provided between the valve body 112b and the inner wall of the mounting channel 111a. The sixth seal 14 is used to seal the gap between the valve body 112b and the inner wall of the mounting channel 111a. Exemplarily, the sixth seal 14 can be a sealing ring, or other sealing structures such as sealant.

[0067] In some examples, the inner wall surface of the second connecting hole 121b is provided with a seventh seal 15. When the valve core 112c of the valve 112 closes the second connecting hole 121b, the seventh seal 15 can seal the gap between the inner wall surface of the second connecting hole 121b and the valve core 112c.

[0068] In some examples, both the first connecting hole 121a and the second connecting hole 121b are located on the bottom wall 122a of the second housing 122. In some examples, the top cover 111b of the first housing 111 is also provided with an air inlet 113. The air inlet 113 communicates with the first chamber 131. The air inlet 113 is used to fill the main chamber of the dual-chamber air spring 1000 with gas.

[0069] The dual-chamber air spring 1000 has a complex structure, making it inconvenient to test its airtightness, resulting in a high scrap rate after assembly. Therefore, it is necessary to test the airtightness of the air spring piston 1 before the dual-chamber air spring 1000 is assembled.

[0070] When performing an airtightness test on the air spring piston 1, it is necessary to test both the external leakage (i.e., leakage from the first chamber 131 and the second chamber 132 to the outside) and the internal leakage (i.e., leakage between the first chamber 131 and the second chamber 132).

[0071] Among them, the detection of external leakage of air spring piston 1 mainly involves detecting whether there is leakage in the weld between the top cover 111b of the first housing 111 and the peripheral wall 122b of the second housing 122 (i.e., the first welding position) and whether there is leakage between the valve body 112b of the valve 112 and the inner peripheral wall 122b of the installation channel 111a (i.e., whether the sixth sealing element 14 is tight).

[0072] The internal leakage detection of the air spring piston 1 mainly involves checking whether there is leakage at the weld between the top cover 111b of the first housing 111 and the partition plate 123 (i.e., the second welding position) and whether there is leakage between the valve core 112c of the valve 112 and the inner peripheral wall 122b of the second connecting hole 121b (i.e., whether the seventh sealing element 15 is tight).

[0073] Based on this, this application provides an airtightness detection system 10. Please refer to... Figure 3 , Figure 3 This is a schematic diagram of the structure of an airtightness testing system 10 provided in an embodiment of this application. The airtightness testing system 10 includes an airtightness testing device 2, an airtightness testing equipment 3, and a robotic arm 4.

[0074] The air tightness testing device 2 is used to detect external leakage of the air spring piston 1, and the air tightness testing equipment 3 is used to detect internal leakage of the air spring piston 1. When the air tightness testing system 10 starts running, the robot arm 4 first places the air spring piston 1 into the air tightness testing device 2 to detect external leakage. After the external leakage of the air spring piston 1 is detected, the robot arm 4 transfers the air spring piston 1 from the air tightness testing device 2 to the air tightness testing equipment 3 to detect internal leakage. After the internal leakage is detected, the robot arm 4 removes the air spring piston 1 from the air tightness testing equipment 3 for transport to the next process.

[0075] Using a robotic arm 4 to replace manual transfer of the air spring piston 1 enables automated production line testing of the air tightness of the air spring piston 1. Furthermore, the robotic arm 4 facilitates the transfer of the air spring piston 1 between the air tightness testing device 2 and the air tightness testing equipment 3, improving the efficiency of air tightness testing.

[0076] In some other embodiments, the airtightness detection system 10 may also include only the airtightness detection device 2. For example, the airtightness detection system 10 is used to detect single-chamber air springs. Since a single-chamber air spring has only one chamber, it is not necessary to detect internal leakage.

[0077] The structure, function, and testing process of the airtightness testing device 2 are described in detail below.

[0078] In some embodiments, please refer to Figure 4 , Figure 4 for Figure 3 The diagram shows the structure of the airtightness testing device 2 in the airtightness testing system 10. The airtightness testing device 2 includes a housing 21, a first sealing element 22, and a gas detector 23. The housing 21 has a sealed cavity 211 and a first inflation channel 212 communicating with the sealed cavity 211. When detecting whether the air spring piston 1 is leaking, the air spring piston 1 is placed inside the sealed cavity 211, and the first inflation channel 212 communicates with the connecting hole 121 to fill the inflation chamber 13 with test gas. The first sealing element 22 is located in the sealed cavity 211 and surrounds the first inflation channel 212 to seal the connection between the first inflation channel 212 and the connecting hole 121. The gas detector 23 communicates with the sealed cavity 211 to detect the content of the test gas within the sealed cavity 211.

[0079] With the configuration of housing 21, first seal 22 and gas detector 23, when detecting whether air spring piston 1 is leaking, air spring piston 1 is placed in sealed cavity 211, and first seal 22 is arranged around first inflation channel 212. At this time, first seal 22 can seal the inner wall of housing 21 where first inflation channel 212 is located and the outer wall of air spring piston 1 where air intake channel is located, so that after first inflation channel 212 is connected to air intake channel, first inflation channel 212 and air intake channel can be sealed and connected. That is, when detection gas is filled into inflation chamber 13 through first inflation channel 212 and air intake channel, detection gas will not leak from air spring piston 1 to sealed cavity 211 at the connection between first inflation channel 212 and air intake channel. In this way, it is only necessary to place the air spring into the sealed cavity 211, with the first sealing element 22 surrounding the first inflation channel 212, and then fill the inflation chamber 13 with detection gas. The gas content of the gas detector 23 can be observed to detect whether the air spring piston 1 is leaking. Thus, the air tightness detection device 2 has a simple structure and the operation of air tightness detection is relatively convenient, thereby improving the efficiency of air tightness detection.

[0080] For example, the detection gas can be helium, hydrogen, argon, and xenon, etc.

[0081] For example, the gas detector 23 can be a helium mass spectrometer, a pressure sensor, and a pressure drop tester, etc.

[0082] The inflation chamber 13 includes a first chamber 131 and a second chamber 132. When detecting external leakage of the air spring piston 1, the valve core 112c is controlled by the valve 112 to open the second connecting hole 121b, so that the first connecting hole 121a is connected to the first inflation channel, and the second connecting hole 121b is also connected to the first inflation channel 212. In this way, when the detection gas is filled through the first inflation channel 212, the detection gas can enter the first chamber 131 and the second chamber 132. If the first welding position and the sixth sealing element 14 are not sealed tightly, the detection gas will leak into the sealing cavity 211 and then enter the gas detector 23. The gas detector 23 can detect parameters such as the content and pressure of the detection gas to determine whether there is external leakage of the air spring piston 1.

[0083] For example, the gas detector 23 is a helium mass spectrometer, the gas to be detected is helium, and the amount of helium filled into the first chamber 131 and the second chamber 132 is 5 × 10⁻⁶. 5 Pa-8×10 5 Pa, the helium content detected by the helium detector mass spectrometer exceeded the preset value (6×10) for a preset time (15-20 seconds). -5 Pa×m 3 If / s), then it is determined that the air spring piston 1 is leaking externally.

[0084] In some embodiments, the housing 21 includes a body portion 213 and a base portion 214. The body portion 213 is provided with a sealing cavity 211 and includes a first wall panel 213a. The base portion 214 is disposed in the sealing cavity 211 and connected to the first wall panel 213a. The base portion 214 is used to place the air spring piston 1. The first inflation channel 212 extends from the outer surface of the first wall panel 213a to the side surface of the base portion 214 opposite to the first wall panel 213a.

[0085] The base portion 214 is designed to facilitate the placement of the air spring piston 1 inside the housing 21; the first inflation channel 212 extends from the outer surface of the first wall plate 213a to the side surface of the base portion 214 opposite to the first wall plate 213a, thereby facilitating the inflation of detection gas into the air spring piston 1 through the first inflation channel 212.

[0086] The main body 213 and the base 214 are integrally formed.

[0087] In some embodiments, the housing 21 includes a first part 216 and a second part 217; the airtightness detection device 2 further includes a first lifting assembly 24, which is connected to the first part 216 and is used to drive the first part 216 to move between a first position and a second position. When the first part 216 is in the first position, the first part 216 is separated from the second part 217; when the first part 216 is in the second position, the first part 216 and the second part 217 are sealed together to define a sealing cavity 211.

[0088] The first lifting component 24 drives the first part 216 of the housing 21 to move between the first position and the second position, so that when the air spring piston 1 is placed into the housing 21, no manual operation is required to open and close the housing. This facilitates the placement and removal of the air spring piston 1 in the housing 21, thereby saving labor costs and improving the detection efficiency of the air spring piston 1.

[0089] Furthermore, when the first lifting assembly 24 drives the first part 216 of the housing 21 to the second position, the first lifting assembly 24 can apply a force toward the second part 217 to the first part 216, making the sealing connection between the first part 216 and the second part 217 of the housing 21 tighter, so as to prevent the detection gas from leaking out of the accommodating cavity defined by the first part 216 and the second part 217, thereby making the detection results more accurate.

[0090] The first lifting component 24 can be a cylinder, a hydraulic press, an electric push rod, etc.

[0091] For example, the first lifting component 24 is a cylinder. When the cylinder drives the first part 216 of the housing 21 to the first position, the first part 216 of the housing 21 separates from the second part 217. At this time, the robot 4 puts the air spring piston 1 into the sealed cavity 211 of the housing 21. The seal 22 seals the connecting hole 121 and the first inflation channel 212 to prevent the filled gas from leaking into the sealed cavity 211 from the connection between the connecting hole 121 and the first inflation channel 212. Then the robot 4 exits the sealed cavity 211, and then the cylinder drives the first part 216 to the second position, so that the first part 216 and the second part 217 are sealed together.

[0092] The second part 217 of the box body 21 includes a first wall panel 213a and a first enclosure panel 213b. The first enclosure panel 213b is disposed on one side of the first wall panel 213a in the thickness direction and surrounds the first wall panel 213a in the thickness direction to form a first cavity with the first wall panel 213a that is open on one side.

[0093] The first wall panel 213a can be composed of multiple panels connected end to end in sequence around the thickness direction of the first wall panel 213a, or it can be a cylindrical structure.

[0094] The first part 216 of the box body 21 includes a second wall panel 216a and a second enclosure panel 216b. The second enclosure panel 216b is disposed on one side of the second wall panel 216a in the thickness direction and surrounds the second wall panel 216a in the thickness direction to form a second cavity with the second wall panel 216a that is open on one side.

[0095] The second wall panel 216a can be composed of multiple panels connected sequentially around the thickness of the second wall panel 216a, or it can be a cylindrical structure.

[0096] When the first part 216 is in the second position, the openings of the first cavity and the second cavity face each other, and the first cavity and the second cavity are joined together to form a sealed cavity 211.

[0097] In some embodiments, the first inflation channel 212 includes a first groove 212a and a first channel 212b. The first groove 212a is recessed from the side surface of the base portion 214 facing away from the first wall panel 213a toward the first wall panel 213a. The first channel 212b extends from the outer surface of the first wall panel 213a through the first groove 212a.

[0098] By setting the first groove 212a and the first channel 212b, the detection gas is buffered in the first groove 212a before entering the inflation chamber 13, so as to avoid the detection gas entering the inflation chamber 13 having too great an impact force.

[0099] In some embodiments, the orthographic projection of the first channel portion 212b onto the plane where the first wall panel 213a is located is within the orthographic projection of the first groove portion 212a onto the plane where the first wall panel 213a is located.

[0100] In this way, by setting the size of the diameter of the first groove 212a, it can be ensured that the detection gas can be filled into the inflation chamber 13, without having to set the diameter of the first channel 212b to be too large, thus avoiding the first channel 212b having an excessively large diameter volume, which would affect the structural strength.

[0101] In some embodiments, the first seal 22 is disposed on the base portion 214 and surrounding the first groove portion 212a. When detecting whether the air spring piston 1 is leaking, the first seal 22 is disposed between the base portion 214 and the air spring piston 1.

[0102] The first seal 22 is disposed on the base portion 214 to facilitate its installation. Furthermore, when detecting external leakage of the air spring piston 1, the first seal 22 can seal the lower wall surface of the air spring piston 1 with the base portion 214 to prevent the detection gas from escaping outward from between the lower wall surface of the air spring piston 1 and the base portion 214 into the sealing cavity 211, thereby avoiding affecting the accuracy of the detection results.

[0103] For example, the first seal 22 can be a rubber gasket or a rubber sealing ring, etc.

[0104] In some embodiments, the housing 21 further includes a first limiting portion 215, which is disposed on the base portion 214 and surrounds the first seal 22. When detecting whether the air spring piston 1 is leaking, a portion of the air spring piston 1 is located within the first limiting portion 215.

[0105] When the air spring piston 1 is placed on the base portion 214 of the housing 21, the first limiting portion 215 can position the air spring piston 1, making it easier for the air spring piston 1 to be placed inside the housing 21. Furthermore, the first limiting portion 215 can also limit the air spring piston 1, making the air spring piston 1 more stable when placed inside the housing 21.

[0106] The first limiting part 215 and the base part 214 are integrally formed. For example, the first limiting part 215 can be an annular plate-like structure, a block-like structure, etc. The first limiting part 215 can also be a plurality of plate-like structures, block-like structures, rod-like structures, etc., spaced apart around the first sealing member 22.

[0107] In some embodiments, the airtightness detection device 2 further includes a second seal 25, which is disposed between the first portion 216 and the second portion 217 when the first portion 216 is in the second position.

[0108] The second seal 25 is placed between the first part 216 and the second part 217, so that when the first part 216 is in the second position, the sealing connection between the first part 216 and the second part 217 is better, so as to prevent the detection gas from escaping from the first part 216 and the second part 217 to the outside of the box 21, thereby affecting the detection results.

[0109] The second sealing element 25 can be a rubber gasket or a rubber sealing ring, etc. In some embodiments, the base portion 214 is connected to the second portion 217, and the housing 21 also includes a positioning portion 218, which is connected to the first portion 216 and is disposed opposite to the base portion 214; when detecting whether the air spring piston 1 is leaking, the positioning portion 218 and the base portion 214 clamp and position the air spring piston 1 from the opposite ends of the air spring piston 1.

[0110] After the air spring piston 1 is placed on the base part 214, the air spring piston 1 is clamped from the opposite ends by the positioning part 218 of the first part 216 and the base part 214 of the second part 217, so that the air spring piston 1 is more stable when it is tested in the housing 21, thereby improving the accuracy of the test.

[0111] The positioning part 218 is connected to the second wall panel 216a of the first part 216. The positioning part 218 and the second wall panel 216a of the first part 216 are integrally formed. For example, the positioning part 218 can be a columnar plate structure, a block structure, etc.

[0112] In some embodiments, the plane where the inlet of the first connecting hole 121a is located and the plane where the inlet of the second connecting hole 121b is located are both located on the first wall surface of the air spring piston 1. When detecting whether the air spring piston 1 is leaking, the first wall surface faces the side of the base portion 214 that is away from the first wall plate 213a.

[0113] The housing 21 and the first seal 22 can be configured according to the positions of the first connecting hole 121a and the second connecting hole 121b, thereby simplifying the structure of the external leakage detection device.

[0114] In some examples, the housing 21 and the first seal 22 can be configured according to the number of cavities of the air spring piston 1 and the position of the connecting hole 121, so that the air tightness testing device 2 can perform air tightness testing on single-cavity air spring piston 1 or multi-cavity air spring piston 1, thereby improving the applicability of the air tightness testing device 2.

[0115] In some embodiments, the surface of the first component 11 facing away from the base portion 214 is also provided with an air inlet 113 communicating with the inflation chamber 13; the air tightness detection device also includes a third seal 26, which is disposed on the positioning portion 218. When detecting whether the air spring piston 1 is leaking, the third seal 26 surrounds the air inlet 113 and is disposed between the positioning portion 218 and the air spring piston 1.

[0116] The third sealing element 26 is provided to seal the plane where the positioning part 218 and the air inlet 113 are located, so as to prevent the detection gas filled into the first chamber 131 from leaking from the air inlet 113 into the sealed cavity 211 and affecting the detection effect.

[0117] The third sealing element 26 can be a rubber gasket or a rubber sealing ring, etc.

[0118] The air inlet 113 is connected to the first chamber 131 of the air spring piston 1.

[0119] In some other embodiments, the air tightness detection system 10 also includes an air tightness detection device 3 for detecting whether the air spring has internal leakage.

[0120] The structure, function, and testing process of the airtightness testing equipment 3 will be described in detail below.

[0121] In some embodiments, please refer to Figure 5 , Figure 5 for Figure 3 The diagram shows the structure of the airtightness testing device 3 in the airtightness testing system 10. The airtightness testing device 3 includes a first sealing fixture 31, a fourth sealing element 32, and a pressure drop detector 33. The first sealing fixture 31 has a second inflation channel 311. When detecting whether the air spring piston 1 has internal leakage, the second connecting hole 121b is blocked, the air spring piston 1 is placed on the first sealing fixture 31, and the second inflation channel 311 communicates with the first connecting hole 121a to inject test gas into the first chamber 131. The fourth sealing element 32 is located on the first sealing fixture 31 and surrounds the second inflation channel 311 to seal the second inflation channel 311 with the first connecting hole 121a. The pressure drop detector 33 communicates with the second inflation channel 311 to detect the pressure inside the first chamber 131.

[0122] By setting up the first sealing fixture 31, the fourth sealing element 32, and the pressure drop detector 33, when detecting whether the air spring piston 1 has internal leakage, the air spring piston 1 is placed on the first sealing fixture 31, and the second connecting hole 121b is blocked. The fourth sealing element 32 is used to seal the plane where the first sealing fixture 31 and the first connecting hole 121a are located, so that the second inflation channel 311 and the air inlet channel can be sealed and connected. That is, when gas is filled into the first chamber 131 through the second inflation channel 311 and the first connecting hole 121a, the detection gas will not leak outward from the first inflation channel 212 and the first connecting hole 121a. In this way, it is only necessary to place the air spring piston 1 on the first sealing fixture 31, make the fourth sealing element 32 surround the second inflation channel 311, block the second connecting hole 121b, and then fill the inflation chamber 13 with detection gas. The change in the value of the pressure drop detector 33 can be observed to detect whether the air spring piston 1 has internal leakage. Thus, the airtightness testing device 3 has a simple structure and the operation of airtightness testing is relatively convenient, thereby improving the efficiency of airtightness testing.

[0123] For example, the detection gas can be hydrogen, argon, or xenon.

[0124] When detecting internal leakage of the air spring piston 1, valve 112 is closed to block the second connecting hole 121b, allowing the detection gas to enter the first chamber 131 through the second inflation channel 311 and the first connecting hole 121a. If the second welding position and the seventh sealing element 15 are not sealed tightly, the detection gas will leak from the first chamber 131 to the second chamber 132, thereby enabling the pressure drop detector 33 connected to the second inflation channel 311 to detect the pressure of the detection gas to determine whether there is internal leakage in the air spring.

[0125] For example, the detection gas is hydrogen, and the hydrogen pressure filled into the first chamber 131 is 5 × 10⁻⁶. 5 Pa-8×10 5 If the pressure drop detector 33 detects that the pressure drop in the first chamber 131 exceeds the preset value (400Pa) for a preset time (5-10 seconds), it is determined that the air piston is leaking internally.

[0126] In some embodiments, the first sealing fixture 31 includes a first surface 312 and a second surface 313 disposed opposite to each other. The first surface 312 is used to place the air spring piston 1. The second inflation channel 311 includes a second channel portion 311a and a second groove portion 311b. The second groove portion 311b is recessed from the first surface 312 toward the second surface 313, and the second channel portion 311a extends from the second surface 313 to the second groove portion 311b.

[0127] The first surface 312 of the first sealing fixture 31 facilitates the placement of the air spring piston 1. The arrangement of the second channel portion 311a and the second groove portion 311b allows the detection gas to be buffered in the second groove portion 311b before entering the inflation chamber 13, thus avoiding excessive impact force of the detection gas entering the first chamber 131.

[0128] In some embodiments, the first sealing fixture 31 further includes a main body 314 and a second limiting part 315. The main body 314 includes a first surface 312 and a second surface 313. The second limiting part 315 is connected to the first surface 312 and is disposed around the fourth seal 32. When detecting whether the air spring piston 1 is leaking internally, a portion of the air spring piston 1 is located inside the second limiting part 315.

[0129] The second limiting part 315 positions the air spring piston 1 during the process of placing it on the first surface 312 of the first sealing fixture 31, making it easier for the air spring piston 1 to be placed on the first sealing fixture 31. The second limiting part 315 can also limit the air spring piston 1, making the air spring piston 1 more stable when placed on the first sealing fixture 31.

[0130] The second limiting part 315 and the main body part 314 are integrally formed.

[0131] In some embodiments, the airtightness testing device 3 further includes a second sealing fixture 34, which is disposed opposite to the first sealing fixture 31 and is used to press the air spring piston 1 onto the first sealing fixture 31.

[0132] After the air spring piston 1 is placed on the first surface 312 of the first sealing fixture 31, the second sealing fixture 34 is used to press the air spring piston 1 on the first surface 312 of the first sealing fixture 31, making the air spring piston 1 more stable during testing, thereby improving the accuracy of the test results.

[0133] In some embodiments, the airtightness testing device 3 further includes a second lifting assembly 35, which is connected to a second sealing fixture 34 and is used to drive the second sealing fixture 34 to move in a direction away from or close to the first sealing fixture 31.

[0134] The second lifting assembly 35 drives the second sealing fixture 34 away from or closer to the first sealing fixture 31, making it easier for the air spring piston 1 to be picked up and placed on the first sealing fixture 31 when performing internal leakage detection, thereby improving the efficiency of internal leakage detection of the air spring piston 1.

[0135] Furthermore, the second lifting assembly 35 can replace manual labor to move the second sealing fixture 34 away from or closer to the first sealing fixture 31, thereby saving labor costs.

[0136] The second lifting component 35 can be a cylinder, a hydraulic press, an electric push rod, etc.

[0137] For example, the second lifting component 35 is a cylinder. When detecting internal leakage of the air spring piston 1, the cylinder drives the second sealing fixture 34 away from the first sealing fixture 31, and the robot arm 4 transfers the air spring piston 1 from the air tightness testing device 2 to the first sealing fixture 31 of the air tightness testing device 3. Then, the cylinder drives the second sealing fixture 34 to approach the first sealing fixture 31, so that the first sealing fixture 31 and the second sealing fixture 34 clamp the air spring piston 1.

[0138] In some embodiments, the orthographic projection of the second channel portion 311a onto the first surface 312 lies within the orthographic projection of the second groove portion 311b onto the first surface 312.

[0139] In this way, after the gas source is connected to the second channel section 311a, the injected detection gas first enters the second groove section 311b, and then enters the first chamber 131 through the second groove section 311b. The arrangement of the second channel section 311a and the second groove section 311b facilitates connection with the gas source.

[0140] In some embodiments, the fourth seal 32 is disposed around the second groove 311b, and when detecting whether the air spring piston 1 is leaking internally, the fourth seal 32 is located between the first surface 312 and the air spring piston 1.

[0141] The fourth seal 32 is arranged around the second groove 311b to facilitate its installation. Furthermore, when detecting internal leakage in the air spring piston 1, the fourth seal 32 can seal the plane containing the first surface 312 of the first sealing fixture 31 and the lower wall surface of the air spring piston 1 to prevent the detection gas from leaking outward between the first surface 312 and the lower wall surface of the air spring piston 1, thus avoiding affecting the accuracy of the detection results.

[0142] The fourth sealing element 32 can be a rubber gasket or a rubber sealing ring, etc.

[0143] In some embodiments, when detecting whether the air spring piston 1 is leaking internally, the valve core 112c closes the second communication hole 121b.

[0144] The second connecting hole 121b is closed by the valve core 112c of the air spring piston 1, eliminating the need for additional components to block the second connecting hole 121b on the first sealing fixture 31, thereby simplifying the structure of the first sealing fixture 31.

[0145] In some embodiments, the second sealing fixture 34 is provided with a conductive channel 341, which is connected to the installation channel 111a; the airtightness testing device 3 also includes a power supply 36 and a conductive element 37, which is connected to the power supply 36 and passes through the conductive channel 341; part of the conductive element 37 is located in the installation channel 111a, and when detecting whether the air spring piston 1 is leaking internally, the conductive element 37 is electrically connected to the valve 112.

[0146] By connecting the conductive channel 341 to the mounting channel 111a, it is convenient to pass the conductive component 37 connected to the power supply 36 through the conductive channel 341 and the mounting channel 111a, and connect it to the valve 112, so that the valve 112 is energized. Thus, the power supply 36 can control the valve core 112c to open or close the second connecting hole 121b, thereby improving the efficiency of internal leakage detection of the air spring piston 1.

[0147] The conductive component 37 can be a rigid cable or a rod-shaped structure made of conductive metal, such as aluminum, graphene, copper, or carbon nanotubes.

[0148] In some embodiments, the first component 11 is further provided with an air inlet 113 communicating with the first chamber 131; the air tightness testing device 3 further includes a fifth seal 38, which is disposed on the second sealing fixture 34. When detecting whether the air spring piston 1 is leaking internally, the fifth seal 38 surrounds the air inlet 113 and is located between the second sealing fixture 34 and the air spring piston 1.

[0149] The fifth seal 38 is provided to seal the plane where the second sealing fixture 34 and the air inlet 113 are located, so as to prevent the detection gas filled into the first chamber 131 from leaking out through the air inlet 113, so as to avoid affecting the accuracy of the detection results.

[0150] The fifth sealing element 38 can be a rubber gasket or a rubber sealing ring, etc.

[0151] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An airtightness testing device (2) for detecting whether an air spring piston (1) leaks externally, the air spring piston (1) comprising a first component (11) and a second component (12), the first component (11) and the second component (12) being connected and defining an inflation chamber (13), the second component (12) being provided with a communicating hole (121) communicating with the inflation chamber (13); characterized in that, The airtightness testing device (2) includes: The housing (21) is provided with a sealed cavity (211) and a first inflation channel (212) communicating with the sealed cavity (211). When detecting whether the air spring piston (1) is leaking, the air spring piston (1) is placed in the sealed cavity (211), and the first inflation channel (212) is connected to the communicating hole (121) to fill the inflation chamber (13) with detection gas. The first sealing element (22) is disposed in the sealing cavity (211) and surrounds the first inflation channel (212) for sealing connection between the first inflation channel (212) and the connecting hole (121); A gas detector (23) is connected to the sealed cavity (211) and is used to detect the content of the detection gas in the sealed cavity (211).

2. The airtightness testing device (2) according to claim 1, characterized in that, The housing (21) includes: The body part (213) is provided with the sealing cavity (211); the body part (213) includes a first wall panel (213a); The base portion (214) is disposed in the sealed cavity (211) and connected to the first wall plate (213a). The base portion (214) is used to place the air spring piston (1). The first inflation channel (212) extends from the outer surface of the first wall plate (213a) to the side surface of the base portion opposite to the first wall plate (213a).

3. The airtightness testing device (2) according to claim 2, characterized in that, The first inflation channel (212) includes: The first groove (212a) is recessed from the side surface of the base portion (214) facing away from the first wall panel (213a) toward the first wall panel (213a); The first channel portion (212b) extends from the outer surface of the first wall panel (213a) to the first groove portion (212a).

4. The airtightness testing device (2) according to claim 3, characterized in that, The orthographic projection of the first channel portion (212b) onto the plane where the first wall panel (213a) is located lies within the orthographic projection of the first groove portion (212a) onto the plane where the first wall panel (213a) is located.

5. The airtightness testing device (2) according to claim 3, characterized in that, The first seal (22) is disposed on the base portion (214) and surrounding the first groove portion (212a). When detecting whether the air spring piston (1) is leaking, the first seal (22) is disposed between the base portion (214) and the air spring piston (1).

6. The airtightness testing device (2) according to any one of claims 2-5, characterized in that, The housing (21) further includes a first limiting part (215), which is located on the base part (214) and surrounds the first sealing member (22). When detecting whether the air spring piston (1) is leaking, part of the air spring piston (1) is located inside the first limiting part (215).

7. The airtightness testing device (2) according to any one of claims 2-5, characterized in that, The housing (21) includes a first part (216) and a second part (217); The airtightness testing device (2) further includes a first lifting assembly (24), which is connected to the first part (216) and is used to drive the first part (216) to move between a first position and a second position. When the first part (216) is in the first position, the first part (216) is separated from the second part (217). When the first part (216) is in the second position, the first part (216) and the second part (217) are sealed together to define the sealing cavity (211).

8. The airtightness testing device (2) according to claim 7, characterized in that, It also includes a second seal (25) which is disposed between the first portion (216) and the second portion (217) when the first portion (216) is in the second position.

9. The airtightness testing device (2) according to claim 7, characterized in that, The base portion (214) is connected to the second part (217), and the housing (21) further includes a positioning portion (218), which is connected to the first part (216) and is disposed opposite to the base portion (214); When detecting whether the air spring piston (1) is leaking, the positioning part (218) and the base part (214) clamp and position the air spring piston (1) from opposite ends.

10. The airtightness testing device (2) according to any one of claims 2-5, characterized in that, The first component (11) includes a first housing (111); The second component (12) includes a second housing (122) and a partition (123), wherein the first housing (111) is connected to the second housing (122) to define the inflation chamber (13), and the partition (123) is disposed inside the second housing (122) and connected to the first housing (111) to divide the inflation chamber (13) into a first chamber (131) and a second chamber (132); The connecting hole (121) includes a first connecting hole (121a) and a second connecting hole (121b), wherein the first connecting hole (121a) connects to the first chamber (131) and the second connecting hole (121b) connects to the second chamber (132); When detecting whether the air spring piston (1) is leaking, both the first connecting hole (121a) and the second connecting hole (121b) are connected to the first inflation channel (212).

11. The airtightness testing device (2) according to claim 10, characterized in that, The first housing (111) is provided with an installation channel (111a), which communicates with the second chamber (132); The first component (11) further includes a valve (112), which is installed in the installation channel (111a) and the valve core (112c) of the valve (112) is connected to the second communication hole (121b) to open or close the second communication hole (121b); When detecting whether the air spring piston (1) is leaking, the valve core (112c) opens the second communication hole (121b).

12. The airtightness testing device (2) according to claim 10, characterized in that, The plane where the inlet of the first connecting hole (121a) is located and the plane where the inlet of the second connecting hole (121b) is located are both located on the first wall surface of the air spring piston (1). When detecting whether the air spring piston (1) is leaking, the first wall surface is the side surface of the base part (214) facing away from the first wall plate (213a).

13. The airtightness testing device (2) according to claim 9, characterized in that, The surface of the first component (11) facing away from the base portion (214) is also provided with an air inlet (113) that communicates with the inflation chamber (13); The air tightness detection device (2) further includes a third sealing element (26), which is disposed on the positioning part (218). When detecting whether the air spring piston (1) is leaking, the third sealing element (26) surrounds the air inlet (113) and is disposed between the positioning part (218) and the air spring piston (1).

14. An airtightness detection system, characterized in that, Includes the airtightness detection device (2) according to any one of claims 1-12.

15. The airtightness detection system according to claim 14, characterized in that, The first component (11) includes a first housing (111); The second component (12) includes a second housing (122) and a partition (123), wherein the first housing (111) is connected to the second housing (122) to define the inflation chamber (13), and the partition (123) is disposed inside the second housing (122) and connected to the first housing (111) to divide the inflation chamber (13) into a first chamber (131) and a second chamber (132); The connecting hole (121) includes a first connecting hole (121a) and a second connecting hole (121b), wherein the first connecting hole (121a) connects to the first chamber (131) and the second connecting hole (121b) connects to the second chamber (132); The airtightness testing system further includes an airtightness testing device (3) for detecting whether the air spring piston has internal leakage, the airtightness testing device (3) comprising: The first sealing fixture (31) is provided with a second inflation channel (311). When detecting whether the air spring piston (1) is leaking internally, the second connecting hole (121b) is blocked. The air spring piston (1) is placed on the first sealing fixture (31), and the second inflation channel (311) is connected to the first connecting hole (121a) to inject detection gas into the first chamber (131). The fourth sealing element (32) is disposed on the first sealing fixture (31) and arranged around the second inflation channel (311) for sealing connection between the second inflation channel (311) and the first connecting hole (121a); Pressure drop detector (33), which is connected to the second inflation channel (311), is used to detect the pressure in the first chamber (131).

16. The airtightness detection system according to claim 15, characterized in that, The first sealing fixture (31) includes a first surface (312) and a second surface (313) disposed opposite to each other, wherein the first surface (312) is used to place the air spring piston (1); The second inflation channel (311) includes a second channel portion (311a) and a second groove portion (311b), the second groove portion (311b) is recessed from the first surface (312) toward the second surface (313), and the second channel portion (311a) extends from the second surface (313) to the second groove portion (311b).

17. The airtightness detection system according to claim 16, characterized in that, The orthographic projection of the second channel portion (311a) onto the first surface (312) lies within the orthographic projection of the second groove portion (311b) onto the first surface (312).

18. The airtightness detection system according to claim 17, characterized in that, The fourth seal (32) is disposed around the second groove (311b), and when detecting whether the air spring piston (1) is leaking internally, the fourth seal (32) is located between the first surface (312) and the air spring piston (1).

19. The airtightness detection system according to claim 16, characterized in that, The first sealing fixture (31) also includes: The main body (314) includes the first surface (312) and the second surface (313); The second limiting part (315) is connected to the first surface (312) and is disposed around the fourth sealing member (32); When detecting whether the air spring piston (1) is leaking internally, a portion of the air spring piston (1) is located inside the second limiting part (315).

20. The airtightness detection system according to claim 15, characterized in that, The airtightness testing device (3) also includes: The second sealing fixture (34) is arranged opposite to the first sealing fixture (31) and is used to press the air spring piston (1) onto the first sealing fixture (31).

21. The airtightness detection system according to claim 20, characterized in that, The airtightness testing device (3) also includes: The second lifting assembly (35) is connected to the second sealing fixture (34) and is used to drive the second sealing fixture (34) to move in a direction away from or close to the first sealing fixture (31).

22. The airtightness detection system according to claim 20, characterized in that, The first housing (111) is provided with an installation channel (111a), which communicates with the second chamber (132); The first component (11) further includes a valve (112), which is installed in the installation channel (111a) and the valve core (112c) of the valve (112) is connected to the second communication hole (121b) to open or close the second communication hole (121b); When detecting whether the air spring piston (1) is leaking, the valve core (112c) opens the second communication hole (121b).

23. The airtightness detection system according to claim 22, characterized in that, The second sealing fixture (34) is provided with a conductive channel (341), which is connected to the installation channel (111a); The air tightness testing device (3) further includes a power supply (36) and a conductive element (37). The conductive element (37) is connected to the power supply (36) and passes through the conductive channel (341). A portion of the conductive element (37) is located in the mounting channel (111a), and when detecting whether the air spring piston (1) is leaking internally, the conductive element (37) is electrically connected to the valve (112).

24. The airtightness detection system according to claim 20, characterized in that, The first component (11) is also provided with an air inlet (113) communicating with the first chamber (131); The air tightness testing device (3) also includes a fifth sealing element (38), which is disposed on the second sealing fixture (34). When testing whether the air spring piston (1) is leaking internally, the fifth sealing element (38) surrounds the air inlet (113) and is located between the second sealing fixture (34) and the air spring piston (1).

25. The airtightness detection system according to any one of claims 15-24, characterized in that, It also includes a robotic arm (4) for moving the air spring piston (1) from the air tightness testing device (2) to the air tightness testing equipment (3).

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