Air tightness detection device for air spring

Abstract

The invention discloses an air spring air tightness detection device, and relates to the technical field of air springs, the air spring air tightness detection device comprises a workbench, one side of the upper end surface of the workbench is fixedly provided with an L-shaped fixing frame, the inner top of the L-shaped fixing frame is fixedly provided with a fixing tool seat, and the upper end surface of the workbench is movably provided with a lifting column in a penetrating manner; a hydraulic rod used in cooperation with the lifting column is arranged in the workbench, a lifting plate is fixed to the upper end face of the lifting column, two lower mounting blocks are symmetrically arranged on one side of the upper end face of the lifting plate, and a lower optical signal transmitter and a lower signal receiver are fixed to the opposite faces of the two lower mounting blocks correspondingly. An upper mounting block is movably arranged on the upper end face of each lower mounting block, an upper optical signal transmitter and an upper signal receiver are fixed to the opposite faces of the two upper mounting blocks correspondingly, and an air supply assembly is arranged on the workbench. Compared with a traditional static air tightness test, the method is short in time consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of air springs, and in particular to an air spring air tightness detection device. Background Art

[0002] The working principle of an air spring is to utilize the compressibility of gas to achieve elasticity. Specifically, an air spring is a sealed container filled with compressed air. When the air spring is in operation, a compressed air column is formed inside. As the vibration load increases, the spring height decreases, the internal volume decreases, the spring stiffness increases, the effective load-bearing area of ​​the internal air column increases, and the load-bearing capacity increases accordingly. Conversely, when the vibration load decreases, the spring height increases, the internal volume increases, the spring stiffness decreases, the effective load-bearing area of ​​the internal air column decreases, and the load-bearing capacity also decreases.

[0003] The air tightness test of air springs is an important part of ensuring their performance and quality. Usually, a static air tightness test is used to test the air tightness of air springs. A certain amount of gas is injected into the air spring to be tested through the existing air supply assembly, and then the air pressure in the air spring is observed through a pressure gauge or pressure tester to determine whether the air spring has leaks. Usually, the leakage points on the air springs are small, so using this detection method, the air pressure in the air spring will not change much in a short period of time, so a longer waiting time is required. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art:

[0005] Since the leakage points on the air spring are usually small, the static air tightness test method is used to detect the air tightness of the air spring, and the required detection and observation time is relatively long.

[0006] An air spring air tightness detection device is proposed.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] An air spring air tightness detection device includes a workbench, an L-shaped fixing frame is fixed to one side of the upper end surface of the workbench, a fixed workpiece is fixed to the inner top of the L-shaped fixing frame, a lifting column is movably provided through the upper end surface of the workbench, a hydraulic rod for use with the lifting column is provided in the workbench, a lifting plate is fixed to the upper end surface of the lifting column, two lower mounting blocks are symmetrically provided on one side of the upper end surface of the lifting plate, a lower optical signal transmitter and a lower signal receiver are respectively fixed to the opposite surfaces of the two lower mounting blocks, an upper mounting block is movably provided on the upper end surface of each lower mounting block, and an upper optical signal transmitter and an upper signal receiver are respectively fixed to the opposite surfaces of the two upper mounting blocks.

[0009] As a further technical solution of the present invention, a connecting plate is movably provided on one side of the lower end surface of the lifting plate, and two L-shaped connecting arms are symmetrically fixed to the upper end surface of the connecting plate. The end of each L-shaped connecting arm is fixedly connected to the side wall of the lower mounting block, and two outer through grooves corresponding to the L-shaped connecting arms are symmetrically provided on the upper end surface of the lifting plate. A moving component for cooperating with the connecting plate is provided on the lifting plate, and two lifting units 2 for cooperating with the corresponding upper mounting blocks are symmetrically provided on the connecting plate.

[0010] As a further technical solution of the present invention, the moving component includes a sliding groove opened on one side of the lifting plate, the lower end face of the sliding groove passes through the lifting plate, a sliding seat is provided in the sliding groove, a lifting unit 1 for cooperating with the connecting plate is provided on the sliding seat, and a limiting unit and a driving unit for cooperating with the sliding seat are provided in the sliding groove.

[0011] As a further technical solution of the present invention, the limiting unit includes two limiting slots opened on the inner wall of the sliding slot, a limiting slider is slidably arranged in each limiting slot, and the limiting slider is fixedly connected to the side wall of the sliding seat.

[0012] As a further technical solution of the present invention, the driving unit includes a screw rod 1 rotatably arranged on the inner wall of the sliding groove, the screw rod 1 threadedly penetrates the sliding seat, and one end of the screw rod 1 movably penetrates the lifting plate and is fixed with a handwheel 1.

[0013] As a further technical solution of the present invention, the lifting unit 1 includes a screw rod 2 rotatably arranged on the lower end surface of the sliding seat, the lower end thread of the screw rod 2 passes through the connecting plate and is fixed with a handwheel 2, and the sliding seat is provided with a limit member 1 used in conjunction with the connecting plate.

[0014] As a further technical solution of the present invention, the limiting member 1 includes two limiting columns fixed to the lower end surface of the sliding seat, and the lower end of each limiting column movably passes through the connecting plate.

[0015] As a further technical solution of the present invention, each lifting unit two includes a rotating column rotatably arranged on the connecting plate, the lower end of the rotating column rotates through the connecting plate and is fixed with a handwheel three, the upper end of the rotating column rotates through the corresponding lower mounting block and is fixed with a screw rod three, the screw rod three threads penetrates the upper mounting block, each lower mounting block is provided with a limit part two for cooperating with the upper mounting block, a linkage part is provided between the two rotating columns, and the upper end surface of the lifting plate has two inner through grooves symmetrically provided for cooperating with the rotating column.

[0016] As a further technical solution of the present invention, each second limiting member includes two limiting blocks symmetrically fixed to the upper end surface of the lower mounting block, and the upper end surface of each limiting block is movable and penetrates into the upper mounting block.

[0017] As a further technical solution of the present invention, the linkage member includes two pulleys, each pulley is fixedly sleeved on the outer surface of the corresponding rotating column, and a transmission belt is sleeved between the two pulleys.

[0018] Beneficial effects of the present invention:

[0019] 1. When in use, the air spring body to be tested is placed on the upper end surface of the lifting plate, and then the hydraulic rod drives the lifting column, lifting plate and air spring body to rise until the upper end surface of the air spring body is in contact with the lower end surface of the fixed fixture seat, and then the air spring body is installed and fixed to the lower end surface of the fixed fixture seat, and then a certain amount of gas is filled into the air spring body through the air supply assembly, and then the air supply assembly stops working. At this time, the amount of gas in the air spring body remains unchanged, and then the hydraulic rod drives the lifting column, lifting plate and air spring body to rise to the specified height again. At this time, the elastic airbag of the air spring body is squeezed and deformed. At this time, the outermost edge of the lower section of the elastic airbag of the air spring body is at the lower optical signal transmitter and the lower signal The outermost edge of the upper part of the elastic airbag of the air spring body is between the upper optical signal transmitter and the upper signal receiver, which just blocks the optical signal between the upper optical signal transmitter and the upper signal receiver. Since the air spring body is in a squeezed state at this time, if the air spring body leaks, the gas will be quickly discharged, which will cause the upper part or lower part of the elastic airbag of the air spring body to deform and shrink. At this time, the upper signal receiver or the lower signal receiver receives the optical signal and feeds back that the air spring body is leaking. Compared with the traditional static air tightness test, this detection process takes less time.

[0020] 2. The connecting plate, L-shaped connecting arm, lower mounting block and upper mounting block can be moved horizontally by the provided moving assembly, and the upper mounting block can be moved vertically by the provided lifting unit 2, so that the lower optical signal transmitter, lower signal receiver, upper optical signal transmitter and upper signal receiver can be adjusted to appropriate positions, which is suitable for use with other air spring bodies of different specifications and sizes.

[0021] 3. When the height position of the upper optical signal transmitter and the upper signal receiver needs to be adjusted, the operator can rotate the handwheel three, thereby driving the rotating column and the screw rod three to rotate, and the upper mounting block is driven to rise and fall and translate through the screw rod three. And through the cooperation of the linkage parts, the two lower mounting blocks are prompted to rise and fall and move at the same time, thereby adjusting the height position of the upper optical signal transmitter and the upper signal receiver at the same time, reducing the time for matching and debugging between the upper optical signal transmitter and the upper signal receiver. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a structural schematic diagram of the present invention;

[0023] Figure 2 Schematic diagram of the connection between the workbench and the L-shaped fixing frame in the present invention Figure 1 ;

[0024] Figure 3 Schematic diagram of the connection between the workbench and the L-shaped fixing frame in the present invention Figure 2 ;

[0025] Figure 4 Schematic diagram of the structure of the air spring body in the present invention;

[0026] Figure 5 Schematic diagram of the connection between the connecting plate and the L-shaped connecting arm in the present invention;

[0027] Figure 6 Schematic diagram of the connection between the screw rod 1 and the hand wheel 1 in the present invention;

[0028] Figure 7 Schematic diagram of the internal structure of the sliding groove in the present invention;

[0029] Figure 8 Schematic diagram of the connection between the pulley and the transmission belt in the present invention;

[0030] Figure 9 Schematic diagram of the connection between the rotating column and the screw rod three in the present invention.

[0031] In the figure: 1. workbench; 2. L-shaped fixing frame; 3. fixed tool seat; 4. lifting column; 5. lifting plate; 6. lower mounting block; 7. lower optical signal transmitter; 8. lower signal receiver; 9. upper mounting block; 10. upper optical signal transmitter; 11. upper signal receiver; 12. connecting plate; 13. L-shaped connecting arm; 14. outer through groove; 15. sliding groove; 16. sliding seat; 17. limiting slider; 18. screw rod 1; 19. hand wheel 1; 20. screw rod 2; 21. hand wheel 2; 22. limiting column; 23. rotating column; 24. hand wheel 3; 25. screw rod 3; 26. inner through groove; 27. limiting block; 28. pulley; 29. ​​transmission belt; 30. air spring body. DETAILED DESCRIPTION

[0032] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0033] Reference Figures 1-9An air spring air tightness detection device includes a workbench 1, an L-shaped fixing frame 2 is fixed on one side of the upper end surface of the workbench 1, and a fixed tooling seat 3 is fixed on the inner top of the L-shaped fixing frame 2. The installation method between the fixed tooling seat 3 and the L-shaped fixing frame 2 is detachable, so that the fixed tooling seat 3 can be replaced according to air spring bodies 30 of different specifications and sizes.

[0034] A lifting column 4 is movably provided on the upper end surface of the workbench 1. A hydraulic rod used in conjunction with the lifting column 4 is provided inside the workbench 1. A lifting plate 5 is fixed to the upper end surface of the lifting column 4. Two lower mounting blocks 6 are symmetrically provided on one side of the upper end surface of the lifting plate 5. A lower optical signal transmitter 7 and a lower signal receiver 8 are fixed on opposite surfaces of the two lower mounting blocks 6, respectively. An upper mounting block 9 is movably provided on the upper end surface of each lower mounting block 6. An upper optical signal transmitter 10 and an upper signal receiver 11 are fixed on opposite surfaces of the two upper mounting blocks 9, respectively. An air supply assembly is provided on the workbench 1.

[0035] The air supply assembly is an existing technology, and is composed of conventional components such as an air compressor, an air charging pipe, a pressure gauge and a control valve. The purpose is to fill the air spring body 30 to be tested with gas so that the air spring body 30 can meet the test requirements.

[0036] When in use, the air spring body 30 to be tested is placed on the upper end surface of the lifting plate 5, and then the hydraulic rod drives the lifting column 4, the lifting plate 5 and the air spring body 30 to rise until the upper end surface of the air spring body 30 is in contact with the lower end surface of the fixed work seat 3, and then the air spring body 30 is installed and fixed to the lower end surface of the fixed work seat 3 (the specific installation method is conventional technical means), and then a certain amount of gas is filled into the air spring body 30 through the air supply component, and then the air supply component stops working. At this time, the amount of gas in the air spring body 30 remains unchanged, and then the hydraulic rod drives the lifting column 4, the lifting plate 5 and the air spring body 30 to rise to the specified height again. At this time, the elastic airbag of the air spring body 30 is squeezed and deformed, and the outermost edge of the lower section of the elastic airbag of the air spring body 30 is at the lower optical signal transmitter 7 and The upper portion of the air spring body 30 is in a squeezed state. If the air spring body 30 leaks, the gas will be quickly discharged, causing the upper or lower portion of the elastic air bag of the air spring body 30 to deform and shrink. At this time, the upper signal receiver 11 or the lower signal receiver 8 receives the light signal and feeds back that the air spring body 30 is leaking. This detection process (formal detection) is shorter than the traditional static air tightness test.

[0037] A connecting plate 12 is movably provided on one side of the lower end surface of the lifting plate 5, and two L-shaped connecting arms 13 are symmetrically fixed to the upper end surface of the connecting plate 12. The end of each L-shaped connecting arm 13 is fixedly connected to the side wall of the lower mounting block 6, and the upper end surface of the lifting plate 5 is symmetrically provided with two outer through grooves 14 for cooperating with the corresponding L-shaped connecting arms 13. The lifting plate 5 is provided with a moving component for cooperating with the connecting plate 12, and two lifting units 2 for cooperating with the corresponding upper mounting blocks 9 are symmetrically provided on the connecting plate 12.

[0038] The provided moving assembly enables the connecting plate 12, the L-shaped connecting arm 13, the lower mounting block 6 and the upper mounting block 9 to move horizontally, and the provided lifting unit 2 enables the upper mounting block 9 to move vertically, so that the lower optical signal transmitter 7, the lower signal receiver 8, the upper optical signal transmitter 10 and the upper signal receiver 11 can be adjusted to appropriate positions, and is suitable for use with air spring bodies 30 of other different specifications and sizes.

[0039] When performing sealing inspection on a batch of air spring bodies 30, the equipment can be tested and adjusted with a qualified air spring body 30 first, and the lower optical signal transmitter 7, the lower signal receiver 8, the upper optical signal transmitter 10 and the upper signal receiver 11 can be adjusted to appropriate positions to facilitate subsequent testing of the air spring body 30.

[0040] During the initial debugging of the positions of the lower optical signal transmitter 7, the lower signal receiver 8, the upper optical signal transmitter 10 and the upper signal receiver 11, the height position is first adjusted. After the lower optical signal transmitter 7, the lower signal receiver 8, the upper optical signal transmitter 10 and the upper signal receiver 11 match the height of the elastic airbag of the air spring body 30, the horizontal position is adjusted to prompt the lower optical signal transmitter 7, the lower signal receiver 8, the upper optical signal transmitter 10 and the upper signal receiver 11 to approach the elastic airbag of the air spring body 30 until the outermost edge of the elastic airbag of the air spring body 30 just blocks the optical signal between the lower optical signal transmitter 7 and the lower signal receiver 8, as well as the optical signal between the upper optical signal transmitter 10 and the upper signal receiver 11.

[0041] During the formal inspection at a later stage, when the outermost edge of the elastic airbag of the air spring body 30 just blocks the optical signal between the lower optical signal transmitter 7 and the lower signal receiver 8, and the optical signal between the upper optical signal transmitter 10 and the upper signal receiver 11, the lower optical signal transmitter 7, the lower signal receiver 8, the upper optical signal transmitter 10, and the upper signal receiver 11 start to be powered on and work. When the air spring body 30 remains in a squeezed state for a period of time, if the lower signal receiver 8 or the upper signal receiver 11 receives a signal, it indicates that the elastic airbag part of the air spring body 30 is leaking.

[0042] The moving component includes a sliding groove 15 opened on one side of the lifting plate 5. The lower end surface of the sliding groove 15 passes through the lifting plate 5. A sliding seat 16 is provided in the sliding groove 15. A lifting unit 1 used in conjunction with the connecting plate 12 is provided on the sliding seat 16. A limiting unit and a driving unit used in conjunction with the sliding seat 16 are provided in the sliding groove 15.

[0043] The driving unit is provided to enable the sliding seat 16 to translate in the sliding groove 15 , and the lifting unit 1 cooperates to drive the connecting plate 12 to translate together.

[0044] The limiting unit includes two limiting sliding grooves formed on the inner wall of the sliding groove 15 . A limiting slider 17 is slidably disposed in each limiting sliding groove. The limiting slider 17 is fixedly connected to the side wall of the sliding seat 16 .

[0045] Through the cooperation of the provided limiting sliding groove and the limiting sliding block 17, on the one hand, the weight of the sliding seat 16 is borne, and on the other hand, the translation of the sliding seat 16 is limited and guided.

[0046] The driving unit includes a screw rod 18 rotatably arranged on the inner wall of the sliding groove 15. The screw rod 18 is threadedly penetrated through the sliding seat 16. One end of the screw rod 18 movably penetrates the lifting plate 5 and is fixed with a hand wheel 19.

[0047] When the sliding seat 16 needs to be driven to translate, the operator can drive the screw rod 18 to rotate through the hand wheel 19, thereby causing the sliding seat 16 to translate.

[0048] The lifting unit 1 includes a screw rod 20 rotatably arranged on the lower end surface of the sliding seat 16. The lower end thread of the screw rod 20 passes through the connecting plate 12 and is fixed with a hand wheel 21. The sliding seat 16 is provided with a limit member 1 used in conjunction with the connecting plate 12.

[0049] When the height positions of the connecting plate 12, the L-shaped connecting arm 13, the lower mounting block 6 and the upper mounting block 9 need to be adjusted, the operator can drive the screw rod 20 to rotate by turning the hand wheel 21, thereby driving the connecting plate 12 to drive the L-shaped connecting arm 13, the lower mounting block 6 and the upper mounting block 9 to move up and down.

[0050] The first limiting member includes two limiting posts 22 fixed to the lower end surface of the sliding seat 16 , and the lower end of each limiting post 22 movably passes through the connecting plate 12 .

[0051] The limit column 22 is provided to cooperate with the lifting and lowering of the connecting plate 12 on the one hand, and to cooperate with the translation of the connecting plate 12 on the other hand. When the sliding seat 16 translates, the connecting plate 12 is mainly driven to translate by the limit column 22 to avoid bending and deformation of the screw rod 20.

[0052] Each lifting unit 2 includes a rotating column 23 rotatably set on the connecting plate 12, the lower end of the rotating column 23 rotates through the connecting plate 12 and is fixed with a handwheel three 24, the upper end of the rotating column 23 rotates through the corresponding lower mounting block 6 and is fixed with a screw rod three 25, and the screw rod three 25 threadedly penetrates the upper mounting block 9, each lower mounting block 6 is provided with a limiter two for use with the upper mounting block 9, a linkage part is provided between the two rotating columns 23, and the upper end surface of the lifting plate 5 is symmetrically provided with two inner through grooves 26 for use with the rotating column 23.

[0053] When the height positions of the upper optical signal transmitter 10 and the upper signal receiver 11 need to be adjusted, the operator can rotate the handwheel three 24, thereby driving the rotating column 23 and the screw rod three 25 to rotate, and the upper mounting block 9 is driven to rise and fall and translate through the screw rod three 25. Moreover, through the cooperation of the linkage parts, the two lower mounting blocks 6 are prompted to rise and fall and move at the same time, thereby adjusting the height positions of the upper optical signal transmitter 10 and the upper signal receiver 11 at the same time, thereby reducing the time for matching and debugging between the upper optical signal transmitter 10 and the upper signal receiver 11.

[0054] Each second limiting member includes two limiting blocks 27 symmetrically fixed to the upper end surface of the lower mounting block 6 , and the upper end surface of each limiting block 27 is movable and penetrates into the upper mounting block 9 .

[0055] The limit block 27 is provided to prevent the upper mounting block 9 from shaking during use. On the other hand, when the screw rod 25 rotates, the upper mounting block 9 is limited and guided.

[0056] The linkage member includes two pulleys 28 . Each pulley 28 is fixedly sleeved on the outer surface of the corresponding rotating column 23 . A transmission belt 29 is sleeved between the two pulleys 28 .

[0057] When one of the rotating columns 23 rotates, the other rotating column 23 can be driven to rotate through the cooperation of the pulley 28 and the transmission belt 29, so as to cooperate with the height adjustment of the upper mounting block 9.

[0058] When the present invention is in use, the air spring body 30 to be tested is placed on the upper end surface of the lifting plate 5, and then the hydraulic rod drives the lifting column 4, the lifting plate 5 and the air spring body 30 to rise until the upper end surface of the air spring body 30 is in contact with the lower end surface of the fixed work seat 3, and then the air spring body 30 is installed and fixed to the lower end surface of the fixed work seat 3 (the specific installation method is conventional technical means), and then a certain amount of gas is filled into the air spring body 30 through the air supply component, and then the air supply component stops working. At this time, the amount of gas in the air spring body 30 remains unchanged, and then the hydraulic rod drives the lifting column 4, the lifting plate 5 and the air spring body 30 to rise to the specified height again. At this time, the elastic airbag of the air spring body 30 is squeezed and deformed, and the outermost edge of the lower section of the elastic airbag of the air spring body 30 is at the lower light signal Between the transmitter 7 and the lower signal receiver 8, the optical signal between the lower optical signal transmitter 7 and the lower signal receiver 8 is blocked. At this time, the outermost edge of the upper part of the elastic airbag of the air spring body 30 is between the upper optical signal transmitter 10 and the upper signal receiver 11, which blocks the optical signal between the upper optical signal transmitter 10 and the upper signal receiver 11. Since the air spring body 30 is in a squeezed state at this time, if the air spring body 30 leaks, the gas will be quickly discharged, which will cause the upper part or the lower part of the elastic airbag of the air spring body 30 to deform and shrink. At this time, the upper signal receiver 11 or the lower signal receiver 8 receives the optical signal, and feedback is given that the air spring body 30 has a leakage phenomenon. Compared with the traditional static air tightness test, this detection process takes less time;

[0059] The connecting plate 12, the L-shaped connecting arm 13, the lower mounting block 6 and the upper mounting block 9 can be moved horizontally by the provided moving assembly, and the upper mounting block 9 can be moved vertically by the provided lifting unit 2, so that the lower optical signal transmitter 7, the lower signal receiver 8, the upper optical signal transmitter 10 and the upper signal receiver 11 can be adjusted to a suitable position, and the air spring body 30 of other different specifications and sizes can be used;

[0060] When the height positions of the upper optical signal transmitter 10 and the upper signal receiver 11 need to be adjusted, the operator can rotate the handwheel three 24, thereby driving the rotating column 23 and the screw rod three 25 to rotate, and the upper mounting block 9 is driven to rise and fall and translate through the screw rod three 25. Moreover, through the cooperation of the linkage parts, the two lower mounting blocks 6 are prompted to rise and fall and move at the same time, thereby adjusting the height positions of the upper optical signal transmitter 10 and the upper signal receiver 11 at the same time, thereby reducing the time for matching and debugging between the upper optical signal transmitter 10 and the upper signal receiver 11.

[0061] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An air spring air tightness detection device, comprising a workbench (1), characterized in that: An L-shaped fixing frame (2) is fixed on one side of the upper end surface of the workbench (1), a fixed tooling seat (3) is fixed on the inner top of the L-shaped fixing frame (2), a lifting column (4) is movably provided on the upper end surface of the workbench (1), a hydraulic rod used in conjunction with the lifting column (4) is provided in the workbench (1), a lifting plate (5) is fixed on the upper end surface of the lifting column (4), two lower mounting blocks (6) are symmetrically provided on one side of the upper end surface of the lifting plate (5), a lower optical signal transmitter (7) and a lower signal receiver (8) are fixed on opposite surfaces of the two lower mounting blocks (6), an upper mounting block (9) is movably provided on the upper end surface of each lower mounting block (6), an upper optical signal transmitter (10) and an upper signal receiver (11) are fixed on opposite surfaces of the two upper mounting blocks (9), and an air supply component is provided on the workbench (1).

2. The air spring air tightness detection device according to claim 1, characterized in that: A connecting plate (12) is movably provided on one side of the lower end surface of the lifting plate (5); two L-shaped connecting arms (13) are symmetrically fixed on the upper end surface of the connecting plate (12); the end of each L-shaped connecting arm (13) is fixedly connected to the side wall of the lower mounting block (6); two outer through grooves (14) for cooperating with the corresponding L-shaped connecting arms (13) are symmetrically provided on the upper end surface of the lifting plate (5); a moving component for cooperating with the connecting plate (12) is provided on the lifting plate (5); and two lifting units (2) for cooperating with the corresponding upper mounting blocks (9) are symmetrically provided on the connecting plate (12).

3. The air spring air tightness detection device according to claim 2, characterized in that: The moving assembly comprises a sliding groove (15) provided on one side of the lifting plate (5), the lower end surface of the sliding groove (15) passes through the lifting plate (5), a sliding seat (16) is provided in the sliding groove (15), a lifting unit 1 used in conjunction with the connecting plate (12) is provided on the sliding seat (16), and a limiting unit and a driving unit used in conjunction with the sliding seat (16) are provided in the sliding groove (15).

4. The air spring air tightness detection device according to claim 3, characterized in that: The limiting unit comprises two limiting sliding grooves provided on the inner wall of the sliding groove (15), a limiting sliding block (17) is slidably arranged in each limiting sliding groove, and the limiting sliding block (17) is fixedly connected to the side wall of the sliding seat (16).

5. The air spring air tightness detection device according to claim 3, characterized in that: The driving unit includes a screw rod (18) rotatably arranged on the inner wall of the sliding groove (15), the screw rod (18) threadedly penetrates the sliding seat (16), and one end of the screw rod (18) movably penetrates the lifting plate (5) and is fixed with a hand wheel (19).

6. The air spring air tightness detection device according to claim 3, characterized in that: The lifting unit 1 includes a screw rod 2 (20) rotatably arranged on the lower end surface of the sliding seat (16), the lower end of the screw rod 2 (20) is threadedly passed through the connecting plate (12) and is fixed with a hand wheel 2 (21), and the sliding seat (16) is provided with a limiting member 1 used in conjunction with the connecting plate (12).

7. The air spring air tightness detection device according to claim 6, characterized in that: The first limiting member comprises two limiting columns (22) fixed to the lower end surface of the sliding seat (16), and the lower end of each limiting column (22) movably penetrates the connecting plate (12).

8. The air spring air tightness detection device according to claim 2, characterized in that: Each of the lifting units 2 includes a rotating column (23) rotatably arranged on the connecting plate (12), the lower end of the rotating column (23) rotates through the connecting plate (12) and is fixed with a hand wheel 3 (24), the upper end of the rotating column (23) rotates through the corresponding lower mounting block (6) and is fixed with a screw rod 3 (25), the screw rod 3 (25) is threadedly passed through the upper mounting block (9), each lower mounting block (6) is provided with a limiting member 2 used in conjunction with the upper mounting block (9), a linkage member is provided between the two rotating columns (23), and the upper end surface of the lifting plate (5) is symmetrically provided with two inner through grooves (26) used in conjunction with the rotating column (23).

9. The air spring air tightness detection device according to claim 8, characterized in that: Each of the second limiting members comprises two limiting blocks (27) symmetrically fixed to the upper end surface of the lower mounting block (6), and the upper end surface of each limiting block (27) is movable and penetrates into the upper mounting block (9).

10. The air spring air tightness detection device according to claim 8, characterized in that: The linkage member comprises two pulleys (28), each pulley (28) is fixedly sleeved on the outer surface of the corresponding rotating column (23), and a transmission belt (29) is sleeved between the two pulleys (28).

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