Air tightness detection device for upper footstock of automobile air spring

Abstract

The utility model discloses an air tightness detection device for an upper footstock of an automobile air spring, and the device comprises a rack which is internally provided with a horizontal plate fixedly; the seat opening sealing mechanism is arranged on the horizontal plate and comprises a movable clamping plate and a fixed clamping plate, the movable clamping plate and the fixed clamping plate are used for clamping an upper top seat, and a gas injection assembly matched with a seat opening of the upper top seat is arranged on the plate face of the fixed clamping plate; the connector sealing mechanism is arranged on the horizontal plate and comprises a sealing plug located between the movable clamping plate and the fixed clamping plate, and the sealing plug can abut against a port of an inflation connector of an upper top base in a sealed mode through a driving piece. And a lifting immersion mechanism and a visual inspection mechanism. According to the utility model, the inflation joint can be sealed during airtightness detection of the upper footstock, additional sealing elements do not need to be manually arranged, the repeated work of manually disassembling and assembling the sealing elements is avoided, the continuity and stability of the airtightness detection process are ensured, and the detection efficiency is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of air spring testing technology, specifically to a device for testing the air tightness of the upper seat of an automotive air spring. Background Technology

[0002] In the field of modern vehicles, air springs, as a key component of suspension systems that integrate comfort and off-road performance, have gained extremely wide application. They operate by filling a sealed container with compressed air, utilizing the compressibility of gas to achieve ideal non-linear elastic performance. During the production process of air springs, ensuring the airtightness of the air spring's top mount is crucial; therefore, the top mount (such as...) needs to be carefully inspected. Figure 11 (As shown) an airtightness test is performed. This component is designed with a larger opening (i.e., seat 36) for connecting the airbag, and a smaller connector (i.e., inflation connector 37) for filling with compressed air when the air spring is in use.

[0003] Before batch airtightness testing, additional sealing components (such as sealing plugs, clamps, etc.) must be uniformly installed on the inflation joints of the entire batch of top mounts to ensure sealing. The top mount is then fixed between two clamping plates, with the seat opening tightly abutting against the surface of one of the clamping plates. Gas is then injected into the top mount through the air injection port on the clamping plate for testing. The sealing components need to be manually disassembled and reassembled before and after testing, a cumbersome process that consumes significant manpower and time, hindering the overall efficiency of airtightness testing and making it difficult to meet the demands of high-efficiency production. Utility Model Content

[0004] The purpose of this utility model is to provide an air tightness testing device for the upper seat of an automotive air spring, which can seal the inflation joint during the air tightness testing of the upper seat without the need for manual installation of additional sealing components, eliminating the repetitive labor of manually disassembling and assembling sealing components, ensuring the continuity and stability of the air tightness testing process, and effectively improving testing efficiency.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a device for detecting the airtightness of an automotive air spring top seat, comprising:

[0006] A frame, wherein a horizontal plate is fixedly installed inside the frame;

[0007] A seat sealing mechanism is provided on the horizontal plate, which includes a movable clamping plate and a fixed clamping plate for clamping the upper top seat. The plate surface of the fixed clamping plate is provided with an air injection component that cooperates with the seat opening of the upper top seat.

[0008] A joint sealing mechanism is provided on the horizontal plate, and includes a sealing plug located between the movable clamping plate and the fixed clamping plate. The sealing plug can be sealed by a drive member by abutting against the port of the inflation joint of the upper top seat.

[0009] A lifting and immersion mechanism, comprising a water tank disposed below the horizontal plate, the water tank having an opening at its upper end and a lifting assembly for controlling its lifting and lowering disposed below it;

[0010] A visual inspection mechanism, comprising an industrial camera positioned above the horizontal plate, the industrial camera being used to detect whether air bubbles emerge from the upper seat immersed in the water tank.

[0011] A further improvement of this utility model is that a seat positioning block is provided on the fixed clamp plate below the air injection component, which cooperates with the outer wall of the seat of the upper top seat, and a connector positioning block is provided on one side of the seat positioning block, which cooperates with the outer wall of the air inlet of the upper top seat.

[0012] A further improvement of this utility model is that the driving component includes a first cylinder, a lever arm, and a rotating shaft erected on the fixed clamping plate. The lever arm is pivotally connected to the rotating shaft to form a lever structure that can rotate around the rotating shaft. One side of the lower end of the lever arm is hinged to the telescopic end of the first cylinder, and the upper end forms a free end. The sealing plug is disposed on one side of the free end.

[0013] A further improvement of this utility model is that an elastic layer is provided on the surface of the sealing plug that abuts against the inflation connector.

[0014] A further improvement of this utility model is that an installation tube perpendicular to the surface of the upper end of the lever arm is provided on one side, and the sealing plug is connected to the opening of the installation tube through a radial spherical bearing.

[0015] A further improvement of this utility model is that the air injection component includes a slider and a positioning tube that cooperates with the inner wall of the upper top seat opening. The slider includes a sliding part and a sealing part disposed at one end of the sliding part. The sliding part is slidably connected inside the positioning tube. The diameter of the sealing part is the same as the outer diameter of the positioning tube. A first sealing ring is provided between the sealing part and the positioning tube and sleeved on the outer periphery of the sliding part. The slider has an air inlet hole.

[0016] A further improvement of this utility model is that the fixed clamp plate is provided with an installation port, one end of the positioning tube is provided with a first limiting ring, the outer diameter of the first limiting ring is larger than the diameter of the installation port and it is detachably fixed on the fixed clamp plate, the inner diameter of the first limiting ring is smaller than the diameter of the sliding part, and a return spring is horizontally provided between the first limiting ring and the sliding part.

[0017] A further improvement of this utility model is that the slider further includes a limiting part disposed on the end face of the sliding part and passing through the first limiting ring, and a second limiting ring with a diameter larger than the inner diameter of the first limiting ring is detachably and fixedly connected to the outer periphery of the limiting part.

[0018] A further improvement of this utility model is that an annular groove is provided on the fixed clamp plate on the outer periphery of the mounting port, and a second sealing ring is provided in the annular groove that can abut against the upper top seat opening.

[0019] A further improvement of this utility model is that two sets of air injection components are provided laterally at intervals on the fixed clamping plate, two upper top seats are clamped between the fixed clamping plate and the moving clamping plate, and two joint sealing mechanisms are provided, each cooperating with one of the two upper top seats.

[0020] The beneficial effects of this utility model are as follows:

[0021] This invention, through the cooperation of a seat sealing mechanism, a joint sealing mechanism, a lifting and immersion mechanism, and a visual inspection mechanism, can achieve airtightness detection of the upper seat. The detection is carried out by taking pictures with an industrial camera, which reduces manpower consumption and improves the accuracy of the detection. Moreover, the lifting and immersion mechanism controls the water tank to lift and lower to immerse the upper seat. Compared with lifting and lowering the upper seat, the distance between the upper seat and the industrial camera remains unchanged, reducing interference and further improving the accuracy of the detection.

[0022] This invention, by setting a sealing plug between the fixed clamping plate and the moving clamping plate, and a corresponding structure to cooperate with the sealing plug, enables the airtightness testing of the upper seat to be performed, thereby eliminating the need for manual installation of additional sealing components, avoiding repetitive manual disassembly and assembly of sealing components, ensuring the continuity and stability of the airtightness testing process, and effectively improving testing efficiency.

[0023] This utility model effectively supports and positions the upper seat through the seat positioning block and the connector positioning block, so that the tube of the inflation connector remains horizontal, so that the sealing plug can abut against it and seal it.

[0024] The driving component of this invention utilizes the lever principle to drive the sealing plug to abut against the inflation connector, ensuring the stability of the seal. Furthermore, the cylinder can be positioned below the upper seat to be tested, making the entire device more compact and reducing space occupation.

[0025] The lever arm of this invention has an installation tube perpendicular to its surface on one side of its upper end. The sealing plug is connected to the opening of the installation tube through a radial spherical bearing, which allows the sealing plug to be finely adjusted in the radial and axial directions. This ensures that the end face of the sealing plug is always parallel to and in contact with the surface of the workpiece, thereby making the sealing surface of the sealing plug evenly stressed and improving the sealing effect.

[0026] This invention utilizes a positioning tube, a sealing part, and a first sealing ring in conjunction. After the upper seat cavity is filled with gas, the gas pushes the sliding block, causing the sealing part to engage with the end face of the positioning tube and compress the first sealing ring. This deforms the first sealing ring, making it tightly contact the inner wall of the upper seat opening to achieve a seal. This effectively seals the upper seat opening during airtightness testing, providing a good sealing effect, preventing air leakage, and improving the accuracy of the test.

[0027] This utility model provides a return spring between the limiting block and the sliding part. When the pressure block contacts and presses the upper top seat, the compressed return spring returns to its original position through its elasticity and pushes the sliding part away from the limiting block, thereby moving the sliding part away from the first sealing ring. The first sealing ring, which was deformed by the pressure, can be restored through its elasticity and no longer has close contact with the inner wall of the seat opening of the upper top seat. This makes it easier for workers to remove the upper top seat from the positioning tube and improves the efficiency of removing parts. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural schematic diagram of the present invention.

[0029] Figure 2 This is a three-dimensional structural schematic diagram of the present invention (the frame part is not shown in the figure).

[0030] Figure 3 This is a schematic diagram showing the positional relationship between the water tank and the horizontal plate of this utility model.

[0031] Figure 4 This is a schematic diagram of the main structure of the driving component of this utility model.

[0032] Figure 5 This is a schematic diagram of the lever arm of this utility model.

[0033] Figure 6 This is a schematic diagram of the connector positioning block structure of this utility model.

[0034] Figure 7 This is a cross-sectional schematic diagram of the sealing plug structure of this utility model.

[0035] Figure 8 This is a cross-sectional schematic diagram of the fixed clamping plate structure of this utility model.

[0036] Figure 9 This is a cross-sectional view of the slider component structure of this utility model.

[0037] Figure 10 This is a schematic diagram of the fixed clamping plate structure of this utility model.

[0038] Figure 11 This is a schematic diagram of the upper support structure in the prior art.

[0039] In the diagram, 1-frame, 2-horizontal plate, 3-moving clamping plate, 4-fixed clamping plate, 5-sealing plug, 6-water tank, 7-industrial camera, 8-base positioning block, 9-joint positioning block, 10-first cylinder, 11-lever arm, 12-rotating shaft, 13-elastic layer, 14-mounting tube, 15-slider component, 16-positioning tube, 17-sliding part, 18-sealing part, 19-first sealing ring, 20-air inlet. 21-First limiting ring, 22-Reset spring, 23-Limiting part, 24-Second limiting ring, 25-Second sealing ring, 26-Water tank cylinder, 27-Moving clamp drive cylinder, 28-Protrusion, 29-Limiting rod, 30-Support bar, 31-First positioning arc surface, 32-Second positioning arc surface, 33-Radial joint bearing, 34-Pressure block, 35-Upper top seat body, 36-Seal opening, 37-Inflation connector. Detailed Implementation

[0040] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0041] Example 1: Combination Figures 1-11 It is known that a device for testing the air tightness of an automotive air spring top seat includes:

[0042] Frame 1, with a horizontal plate 2 fixed inside the frame 1;

[0043] Seat sealing mechanism, the seat sealing mechanism is set on horizontal plate 2, which includes a movable clamping plate 3 and a fixed clamping plate 4 for clamping the upper top seat, and an air injection component that cooperates with the seat opening of the upper top seat is provided on the plate surface of the fixed clamping plate 4.

[0044] The joint sealing mechanism is set on the horizontal plate 2, and includes a sealing plug 5 located between the moving clamp plate 3 and the fixed clamp plate 4. The sealing plug 5 can be sealed by a drive member against the port of the air inflator of the upper seat.

[0045] The lifting and immersion mechanism includes a water tank 6 located below the horizontal plate 2, with an opening at the upper end of the water tank 6 and a lifting component for controlling its lifting and lowering located below it.

[0046] The visual inspection mechanism includes an industrial camera 7 positioned above the horizontal plate 2. The industrial camera 7 is used to detect whether bubbles are emerging from the top seat immersed in the water tank 6.

[0047] At least two vertical connecting rods are vertically provided on the inner top wall of the frame 1, and the horizontal plate 2 is fixedly installed at the lower end of the vertical connecting rods.

[0048] An imaging port is provided on the inner top wall of the frame 1. The industrial camera 7 is mounted on the upper part of the frame, and its lens captures images downwards through the imaging port. The vision inspection mechanism is a conventional industrial camera assembly capable of detecting bubbles, and this invention does not involve any improvement thereto.

[0049] The lifting and immersion mechanism also includes at least three vertical support rods vertically arranged on the inner bottom wall of the frame 1. Reinforcing plates are provided between the vertical support rods. In the initial state, the lower end of the water tank 6 contacts the upper end of the vertical support rods, providing support. Preferably, the lifting assembly controlling the lifting of the water tank 6 is a water tank cylinder 26, with a horizontal abutment plate provided on the telescopic end of the water tank cylinder 26.

[0050] When the water tank 6 needs to be raised, the extension end of the water tank cylinder 26 extends out and contacts the lower end of the water tank 6, lifting the water tank 6 from the vertical support rod to the designated height. By supporting the water tank 6 in its initial state with the vertical support rod, the load on the water tank cylinder 26 can be reduced, extending its service life.

[0051] On the fixed clamping plate 4, below the air injection assembly, there is a seat positioning block 8 that mates with the outer wall of the seat of the upper top seat. On one side of the seat positioning block 8, there is a connector positioning block 9 that mates with the outer wall of the air inlet of the upper top seat. Preferably, the seat positioning block 8 has a first positioning arc surface 31 that mates with the outer wall of the seat of the upper top seat, and the connector positioning block 9 has a second positioning arc surface 32 that mates with the outer wall of the air inlet.

[0052] The driving component includes a first cylinder 10, a lever arm 11, and a rotating shaft 12 erected on the surface of the fixed clamping plate 4. The lever arm 11 is pivotally connected to the rotating shaft 12 to form a lever structure that can rotate around the rotating shaft 12. The lower end of the lever arm 11 is hinged to the telescopic end of the first cylinder 10, and the upper end forms a free end. A sealing plug 5 is provided on one side of the free end.

[0053] The lower end of the lever arm 11 is hinged to the extension end of the first cylinder 10 through a hinge joint. When the first cylinder 10 extends, it pushes the lever arm 11 to rotate around the pivot 12 with the help of the hinge point, causing the upper end of the lever arm 11 to move in the opposite direction so that the sealing plug 5 presses against the inflation connector.

[0054] An elastic layer 13 is provided on the surface of the sealing plug 5 that abuts against the inflation connector. Preferably, the elastic layer 13 is a rubber layer.

[0055] A mounting tube 14 perpendicular to the surface of the lever arm 11 is provided on one side of its upper end. The sealing plug 5 is connected to the opening of the mounting tube 14 via a radial spherical bearing 33. When the lever arm 11 rotates around the pivot 12, the radial spherical bearing 33 allows the sealing plug 5 to be finely adjusted in the radial and axial directions, so that the end face of the sealing plug 5 always remains parallel and in contact with the port face of the inflation connector. Preferably, the sealing plug 5 is connected to the opening of the mounting tube 14 via the radial spherical bearing 33, and the outer ring of the radial spherical bearing 33 is interference-fitted with the inner wall of the mounting tube 14, while the inner ring is fixed to the outer wall of the sealing plug 5 by threads.

[0056] The first cylinder 10 is located between the fixed clamping plate 4 and the moving clamping plate 3 and below the positioning block 8 of the seat body. It can be set below the clamping upper top seat to reduce space occupation.

[0057] Preferably, a support strip 30 is provided on the surface of the clamping plate 4, and the connector positioning block 9 is fixedly mounted on the support strip 30. Optionally, a limiting rod 29 is provided on the support strip 30, on the side of the connector positioning block 9 near the lever arm 11, to prevent the lever arm 11 from rotating excessively. By setting the limiting rod 29, the movement stroke of the sealing plug 5 can be limited, avoiding excessive pressure that could damage the inflation connector.

[0058] The support bar 30 is parallel to the horizontal plate 2 and has a protrusion 28 on it. A limit rod 29 is threadedly connected to the protrusion 28, and the limit rod 29 is parallel to the fixed clamping plate 4. The extension and retraction direction of the first cylinder 10 and the length direction of the rotating shaft 12 are set along the length direction of the horizontal plate 1. The fixed clamping plate 4, the movable clamping plate 3, and the limit rod 29 are set along the width direction of the horizontal plate 2. When the inflation connector 37 is engaged with the second positioning arc surface 32 of the connector positioning support block 9, it remains horizontal, and the length direction of the inflation connector is consistent with the width direction of the horizontal plate 2. The limit rod 29 is threadedly connected to the protrusion 28, which can be adjusted to flexibly limit the movement stroke of the sealing plug.

[0059] The air injection assembly includes a slider 15 and a positioning tube 16 that mates with the inner wall of the upper top seat opening. The slider 15 includes a sliding part 17 and a sealing part 18 disposed at one end of the sliding part 17. The sliding part 17 is slidably connected inside the positioning tube 16. The diameter of the sealing part 18 is the same as the outer diameter of the positioning tube 16. A first sealing ring 19 is provided between the sealing part 18 and the positioning tube 16 and is sleeved on the outer periphery of the sliding part 17. The slider 15 is provided with an air inlet 20. The air inlet 20 communicates with the inner cavity of the upper top seat after compression.

[0060] The fixed clamp plate 4 is provided with an installation port, and one end of the positioning tube 16 is provided with a first limiting ring 21. The outer diameter of the first limiting ring 21 is larger than the diameter of the installation port and it is detachably fixed on the fixed clamp plate 4. The inner diameter of the first limiting ring 21 is smaller than the diameter of the sliding part 17. A return spring 22 is horizontally provided between the first limiting ring 21 and the sliding part 17.

[0061] The two ends of the return spring 22 abut against the opposing surfaces of the first limiting ring 21 and the sliding part 17, respectively. At least one return spring 22 is provided. Preferably, four return springs 22 are arranged in an array along the central circumference of the first limiting ring 21. Preferably, both the first limiting ring 21 and the sliding part 17 have guide grooves on their opposing surfaces to facilitate guiding the return spring 22, with a portion of the return spring 22 located within the guide groove.

[0062] The slider 15 also includes a limiting part 23 disposed on the end face of the sliding part 17 and extending through the first limiting ring 21. A second limiting ring 24 with a diameter larger than the inner diameter of the first limiting ring 21 is detachably and fixedly connected to the outer periphery of the limiting part 23.

[0063] The sliding part 17, the sealing part 18 and the limiting part 23 are all coaxially arranged and are integrated.

[0064] Optionally, the outer periphery of the limiting part 23 is provided with external threads, and the inner ring of the second limiting ring 24 is provided with internal threads, and the two are fixedly connected by threads.

[0065] The fixed clamping plate 4 has an annular groove on the outer periphery of the mounting opening, and a second sealing ring 25 is provided in the annular groove to abut against the upper top seat opening. This enables secondary sealing and further improves the sealing effect.

[0066] Preferably, two sets of air injection components are provided horizontally at intervals on the fixed clamping plate 4, and two upper top seats are clamped between the fixed clamping plate 4 and the moving clamping plate 3. The joint sealing mechanism is provided with two and cooperates with the two upper top seats respectively.

[0067] A movable clamping plate drive cylinder 27 is provided on one side of the fixed clamping plate 4. A movable clamping plate 16 is provided on the extended end of the movable clamping plate drive cylinder 27, and a pressure block is provided on the movable clamping plate 16. In some models, the upper end of the top seat is provided with a protrusion. In this case, the pressure block can be provided with a relief opening that matches the protrusion to ensure the stability of clamping.

[0068] Preferably, the moving clamp plate driving cylinder 27 is mounted on the cylinder mounting plate, which is vertically mounted. The moving clamp plate driving cylinder 27 is mounted on its surface. At least one slide rod is slidably connected to the upper part of the cylinder mounting plate along the extension direction of the moving clamp plate driving cylinder 27, and one end of the slide rod is connected to the moving clamp plate 3.

[0069] Preferably, a reinforcing stabilizing bar is connected between the cylinder mounting plate and the fixed clamping plate 4. The reinforcing stabilizing bar improves the stability between the cylinder mounting plate and the fixed clamping plate 4, and prevents the cylinder mounting plate from deforming when the moving clamping plate pushes the cylinder 27 out.

[0070] The working principle of the air tightness testing device for the upper seat of an automotive air spring provided by the utility model is as follows: In use, firstly, place the upper seat on the seat positioning block 8, adjust the upper seat so that the inflation connector 37 on it aligns with the second positioning arc surface 32 on the connector positioning block 9 to maintain a horizontal position, then activate the moving clamp drive cylinder 27 so that the moving clamp 3 and the fixed clamp 4 cooperate to clamp the upper seat, achieving a seal on the upper seat opening 35. Next, activate the first cylinder 10 to push the lever arm 11 to rotate around the rotating shaft 12, causing the upper end of the lever arm 11 to move towards the upper seat, thus sealing the plug. 5. The air inlet 20 is tightly pressed against the port face of the air inlet 37 to seal the air inlet 37. Air is injected into the inner cavity of the upper seat through the air inlet 20. After the air fills the upper seat cavity, the sliding block 15 is pushed back to make the sealing part 18 cooperate with the end face of the positioning tube 16 to squeeze the first sealing ring 19. This deforms the first sealing ring 19 and makes it tightly contact the inner wall of the upper seat opening to prevent leakage at the opening 36. The water tank cylinder 26 is started to drive the water tank 6 to rise. The upper seat is submerged in the water surface of the water tank 6. The industrial camera 7 of the upper vision inspection mechanism takes pictures for inspection. If no air bubbles overflow, the air tightness is qualified; otherwise, it is unqualified.

[0071] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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. Any equivalent structural or procedural transformations made using the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A device for detecting the airtightness of an upper seat of an automotive air spring, characterized in that, include: A frame (1) is provided with a horizontal plate (2) fixed inside the frame (1); Seat sealing mechanism, the seat sealing mechanism is set on the horizontal plate (2), which includes a movable clamping plate (3) and a fixed clamping plate (4) for clamping the upper top seat, and the plate surface of the fixed clamping plate (4) is provided with an air injection component that cooperates with the seat opening of the upper top seat; A joint sealing mechanism is provided on the horizontal plate (2), which includes a sealing plug (5) located between the moving clamp plate (3) and the fixed clamp plate (4). The sealing plug (5) can be sealed by a drive member against the port of the inflation joint of the upper top seat. The lifting and immersion mechanism includes a water tank (6) located below the horizontal plate (2), the upper end of the water tank (6) is open and a lifting component for controlling its lifting and lowering is provided below it; The visual inspection mechanism includes an industrial camera (7) disposed above the horizontal plate (2), the industrial camera (7) being used to detect whether bubbles are emerging from the top seat immersed in the water tank (6).

2. The airtightness testing device for the upper seat of an automotive air spring according to claim 1, characterized in that: On the fixed clamp plate (4), below the air injection component, there is a seat positioning block (8) that cooperates with the outer wall of the seat of the upper top seat. On one side of the seat positioning block (8), there is a connector positioning block (9) that cooperates with the outer wall of the air inlet of the upper top seat.

3. The airtightness testing device for the upper seat of an automotive air spring according to claim 1, characterized in that: The driving component includes a first cylinder (10), a lever arm (11), and a rotating shaft (12) erected on the surface of the fixed clamping plate (4). The lever arm (11) is pivotally connected to the rotating shaft (12) to form a lever structure that can rotate around the rotating shaft (12). The lower end of the lever arm (11) is hinged to the telescopic end of the first cylinder (10), and the upper end forms a free end. The sealing plug (5) is disposed on one side of the free end.

4. The airtightness testing device for the upper seat of an automotive air spring according to claim 1, characterized in that: The sealing plug (5) has an elastic layer (13) on the surface that abuts against the inflation connector.

5. The airtightness testing device for the upper seat of an automotive air spring according to claim 3, characterized in that: The upper end of the lever arm (11) is provided with an installation tube (14) perpendicular to its surface, and the sealing plug (5) is connected to the opening of the installation tube (14) through a radial spherical bearing (33).

6. The airtightness testing device for the upper seat of an automotive air spring according to claim 2, characterized in that: The air injection assembly includes a slider (15) and a positioning tube (16) that cooperates with the inner wall of the upper top seat opening. The slider (15) includes a sliding part (17) and a sealing part (18) disposed at one end of the sliding part (17). The sliding part (17) is slidably connected inside the positioning tube (16). The diameter of the sealing part (18) is the same as the outer diameter of the positioning tube (16). A first sealing ring (19) is provided between the sealing part (18) and the positioning tube (16) and sleeved on the outer periphery of the sliding part (17). The slider (15) is provided with an air inlet (20).

7. The airtightness testing device for the upper seat of an automotive air spring according to claim 6, characterized in that: The fixed clamp plate (4) is provided with an installation port, and one end of the positioning tube (16) is provided with a first limiting ring (21). The outer diameter of the first limiting ring (21) is larger than the diameter of the installation port and it is detachably fixed on the fixed clamp plate (4). The inner diameter of the first limiting ring (21) is smaller than the diameter of the sliding part (17). A return spring (22) is horizontally provided between the first limiting ring (21) and the sliding part (17).

8. The airtightness testing device for the upper seat of an automotive air spring according to claim 7, characterized in that: The slider (15) further includes a limiting part (23) disposed on the end face of the sliding part (17) and passing through the first limiting ring (21). The outer periphery of the limiting part (23) is detachably fixedly connected to a second limiting ring (24) with a diameter greater than the inner diameter of the first limiting ring (21).

9. The airtightness testing device for the upper seat of an automotive air spring according to claim 7, characterized in that: The fixed clamp plate (4) is provided with an annular groove on the outer periphery of the mounting port, and a second sealing ring (25) is provided in the annular groove that can abut against the upper top seat opening.

10. The airtightness testing device for the upper seat of an automotive air spring according to claim 1, characterized in that: Two sets of air injection components are provided horizontally at intervals on the fixed clamping plate (4). Two upper top seats are clamped between the fixed clamping plate (4) and the moving clamping plate (3). The joint sealing mechanism is provided with two and cooperates with the two upper top seats respectively.

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