Air spring pressure maintaining valve testing device and testing method

Abstract

This invention provides a testing device and method for an air spring pressure-holding valve. The testing device includes: an environmental chamber containing a test piece; a first accumulator connected to the test piece and the outside atmosphere via a first three-way valve, used to generate a first constant air pressure P1; a second accumulator connected to the test piece and the outside atmosphere via a second three-way valve, and also connected to an air compressor via a single-way valve, used to generate a second constant air pressure P2, where P1 < P2; a controller controls the opening and closing of the first and second three-way valves to charge the first accumulator with air from the test piece and exhaust air from the first accumulator to the outside atmosphere via the test piece, thereby conducting a durability test on the test piece. This solution achieves a durability test with a fixed pressure difference across the pressure-holding valve by controlling the first accumulator, the second accumulator, the first three-way valve, and the second three-way valve.

Description

Technical Field

[0001] This invention relates to the field of spring testing technology, and more specifically, to a test apparatus and test method for an air spring pressure holding valve. Background Technology

[0002] The function of a pressure-holding valve in an air spring is to maintain a certain air pressure within the spring even when the air spring pipeline is disconnected or leaks, while ensuring that the inflation action is not affected during air spring inflation. Under these requirements, the pressure-holding valve needs to have a certain durability under a specific pressure difference between its two ends, and also meet the testing requirements of high and low temperature environments. Currently, however, there is no known benchtop testing equipment for the durability of air spring pressure-holding valves.

[0003] There is currently no effective solution to the technical problem of lacking a device for durability testing of air spring pressure-holding valves. Summary of the Invention

[0004] The main objective of this invention is to provide a testing device and method for an air spring pressure holding valve, in order to solve the problem that there is a lack of devices in the prior art capable of performing durability tests on air spring pressure holding valves.

[0005] To achieve the above objectives, according to one aspect of the present invention, an air spring pressure-holding valve testing device is provided, comprising: an environmental chamber in which a test piece is placed; a first accumulator connected to the test piece and the outside atmosphere via a first three-way valve, the first accumulator being used to generate a first constant air pressure P1; a second accumulator connected to the test piece and the outside atmosphere via a second three-way valve, the second accumulator also being connected to an air compressor via a one-way valve, the second accumulator being used to generate a second constant air pressure P2, wherein P1 < P2; and a controller connected to the first three-way valve, the second three-way valve, the one-way valve, the environmental chamber, and the air compressor; the controller controls the opening and closing of the first three-way valve and the second three-way valve to charge the first accumulator with air through the test piece, and to exhaust air from the first accumulator to the outside atmosphere through the test piece, thereby performing a durability test on the test piece.

[0006] Further, the first accumulator includes: a first accumulator body, which is connected to the test object and the outside atmosphere respectively through a first three-way valve. The first accumulator body is either an air spring or a cylinder. A first piston is provided inside the first accumulator body. The effective cross-sectional area of ​​the first piston is S1, and the effective cross-sectional area of ​​the first piston remains unchanged during movement. A first mass block is detachably connected to the top of the first accumulator body. The first mass block has a first mass M1. Wherein, M1*g=P1*S1, and g is the acceleration due to gravity. A first height sensor is used to detect the height of the first accumulator body and is connected to the controller.

[0007] Furthermore, the second accumulator includes: a second accumulator body, which is connected to a second three-way valve and a single-way valve. The second accumulator body is either an air spring or a cylinder. A second piston is disposed within the second accumulator body. The effective cross-sectional area of ​​the second piston is S2, and the effective cross-sectional area of ​​the second piston remains unchanged during movement. A second mass block is detachably connected to the top of the second accumulator body. The second mass block has a second mass M2, where M2*g = P2*S2, and g is the acceleration due to gravity. A second height sensor is used to detect the height of the second accumulator body and is connected to a controller.

[0008] Furthermore, the slope of the cross sections of the first piston and the second piston is 0.

[0009] Furthermore, P1 = 8 bar, P2 = 18 bar.

[0010] Furthermore, the volume of the first accumulator body at the initial height is V1, and the volume of the second accumulator body at the initial height is V2, where V1 > 2L and V2 > 4L.

[0011] Furthermore, the environmental chamber is equipped with heating elements, cooling elements, and temperature sensors, all of which are connected to the controller.

[0012] According to another aspect of the present invention, a test method for an air spring pressure-holding valve is also provided. The test method is performed using the air spring pressure-holding valve test apparatus described above. The test method includes the following steps: detecting a first initial height of a first accumulator body and a second initial height of a second accumulator body; when both the first initial height and the second initial height meet the initial height conditions, adjusting the temperature inside the environmental chamber to a preset temperature, and performing a preset number of durability cycle tests at the preset temperature, wherein there are multiple preset temperatures; wherein the durability cycle test includes at least: adjusting a first three-way valve to connect the first accumulator body to the test piece, adjusting a second three-way valve to connect the second accumulator body to the test piece; controlling the second accumulator body to exhaust gas to the first accumulator body through the second three-way valve, the test piece, and the first three-way valve for a first preset time; adjusting the first three-way valve to connect the first accumulator body to the test piece, adjusting the second three-way valve to connect the test piece to the outside atmosphere; controlling the first accumulator body to exhaust gas to the outside atmosphere through the first three-way valve, the test piece, and the second three-way valve for a second preset time.

[0013] Furthermore, during the durability cycle test, the test method also includes: detecting the first current height of the first accumulator body; if the first current height is greater than the first threshold height, controlling the first three-way valve to perform an exhaust action until the height of the first accumulator body is less than or equal to the first preset height.

[0014] Furthermore, during the durability cycle test, the test method also includes: detecting the second current height of the second accumulator body; if the second current height is less than the second threshold height, opening the one-way valve and controlling the air compressor to charge the second accumulator body until the height of the second accumulator body is greater than or equal to the second preset height.

[0015] By applying the technical solution of this invention, a constant pressure difference is provided to the test piece through the first accumulator and the second accumulator. The durability test with a fixed pressure difference at both ends of the pressure holding valve is achieved by controlling the first three-way valve and the second three-way valve. At the same time, the controller can be set to realize automated testing and improve testing efficiency. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 A schematic diagram of an embodiment of the air spring pressure holding valve test apparatus according to the present invention is shown;

[0018] Figure 2 A schematic flowchart of an embodiment of a test method for an air spring pressure-holding valve according to the present invention is shown;

[0019] Figure 3 A control logic diagram of the air spring pressure holding valve test apparatus according to the present invention is shown.

[0020] The above figures include the following reference numerals:

[0021] 1. First accumulator; 10. First three-way valve; 11. First accumulator body; 12. First mass block; 13. First height sensor;

[0022] 2. Second accumulator; 20. Second three-way valve; 21. Second accumulator body; 22. Second mass block; 23. Second height sensor;

[0023] 3. Environmental storage chamber;

[0024] 4. The part being tested;

[0025] 5. Controller;

[0026] 6. One-way valve;

[0027] 7. Air compressor. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0032] Combination Figure 1 As shown, according to a specific embodiment of this application, an air spring pressure holding valve testing device is provided.

[0033] like Figure 1 As shown, the air spring pressure holding valve test device includes an environmental chamber 3, a first accumulator 1, a second accumulator 2, and a controller 5. The test piece 4 is placed inside the environmental chamber 3. The first accumulator 1 is connected to the test piece 4 and the outside atmosphere through a first three-way valve 10, and is used to generate a first constant air pressure P1. The second accumulator 2 is also connected to the test piece 4 and the outside atmosphere through a second three-way valve 20. The second accumulator 2 is also connected to an air compressor 7 through a one-way valve 6, and is used to generate a second constant air pressure P2, where P1 < P2. The controller 5 is connected to the first three-way valve 10, the second three-way valve 20, the one-way valve 6, the environmental chamber 3, and the air compressor 7. The controller 5 controls the opening and closing of the first three-way valve 10 and the second three-way valve 20 so that the second accumulator 2 charges the first accumulator 1 through the test piece 4, and the first accumulator 1 exhausts air from the test piece 4 to the outside atmosphere, so as to perform a durability test on the test piece 4.

[0034] Using the technical solution of this embodiment, a constant pressure difference is provided to the test piece 4 through the first accumulator 1 and the second accumulator 2. The durability test of maintaining a fixed pressure difference across the pressure-holding valve is achieved by controlling the first three-way valve 10 and the second three-way valve 20. Simultaneously, the controller 5 enables automated testing, improving testing efficiency. In this embodiment, the test piece 4 is the air spring pressure-holding valve.

[0035] In the embodiments of this application, the first three-way valve 10 and the second three-way valve 20 are both two-position three-way solenoid valves.

[0036] Specifically, the first accumulator 1 includes a first accumulator body 11, a first mass block 12, and a first height sensor 13. The first accumulator body 11 is connected to the measured object 4 and the outside atmosphere through a first three-way valve 10. The first accumulator body 11 can be any one of an air spring or a cylinder. A first piston is provided inside the first accumulator body 11. The effective cross-sectional area of ​​the first piston is S1, and the effective cross-sectional area of ​​the first piston remains unchanged during the movement. The first mass block 12 is detachably connected to the top of the first accumulator body 11. The first mass block 12 has a first mass M1, where M1*g = P1*S1, and g is the acceleration due to gravity. The first height sensor 13 is used to detect the height of the first accumulator body 11 and is connected to the controller 5.

[0037] By setting the mass of the matching first mass block 12, a constant air pressure can be ensured for the first accumulator 1, guaranteeing normal test operation. The first height sensor 13 is used to detect the height of the first accumulator body 11, thereby enabling timely adjustment of the height of the first accumulator body 11 and avoiding safety issues. In this embodiment, the first accumulator body 11 is preferably a sleeve-type air spring. The first mass block 12 can overlap with the top of the first accumulator body 11 or be fixedly connected to the piston of the first accumulator body 11. In this embodiment, the effective cross-sectional area remains constant during movement through the piston's cross-sectional design.

[0038] Specifically, the second accumulator 2 includes a second accumulator body 21, a second mass block 22, and a second height sensor 23. The second accumulator body 21 is connected to the second three-way valve 20 and the single-way valve 6. The second accumulator body 21 can be either an air spring or a cylinder. A second piston is installed inside the second accumulator body 21. The effective cross-sectional area of ​​the second piston is S2, and the effective cross-sectional area of ​​the second piston remains unchanged during movement. The second mass block 22 is detachably connected to the top of the second accumulator body 21. The second mass block 22 has a second mass M2, where M2*g = P2*S2, and g is the acceleration due to gravity. The second height sensor 23 is used to detect the height of the second accumulator body 21 and is connected to the controller 5.

[0039] By setting the mass of the matching second mass block 22, a constant air pressure can be ensured for the second accumulator 2, guaranteeing normal test operation. The second height sensor 23 can detect the height of the second accumulator body 21 in real time, thereby enabling timely adjustment of the height of the second accumulator body 21 and avoiding insufficient inflation. In this embodiment, the second accumulator body 21 is preferably a sleeve-type air spring. The second mass block 22 can overlap with the top of the second accumulator body 21 or be fixedly connected to the piston of the second accumulator body 21. In this embodiment, the effective cross-sectional area remains unchanged during movement through the piston cross-section design.

[0040] Furthermore, the slope of the cross-sections of the first and second pistons is 0. This ensures that the internal pressure of the accumulator remains constant during the intake and exhaust processes.

[0041] Wherein, P1 = 8 bar, and P2 = 18 bar. It should be noted that the values ​​of P1 and P2 can be adjusted according to the actual pressure difference required for the test and the performance parameters of each instrument.

[0042] Furthermore, the volume of the first accumulator body 11 at the initial height is V1, and the volume of the second accumulator body 21 at the initial height is V2, where V1 > 2L and V2 > 4L. By ensuring that the first accumulator body 11 and the second accumulator body 21 have a certain initial height, it is possible to guarantee a sufficient gas supply during operation while providing the measured component with a suitable pressure differential.

[0043] Specifically, the environmental chamber 3 is equipped with heating elements, cooling elements, and a temperature sensor, all of which are connected to the controller 5. By incorporating the heating and cooling elements, the temperature within the environmental chamber 3 can be regulated, enabling durability cycling tests under various temperature environments. The temperature sensor detects the temperature within the environmental chamber 3. The controller 5 is connected to the heating elements, cooling elements, and temperature sensor, allowing it to acquire the real-time temperature within the environmental chamber 3 and control the operation of the heating and cooling elements based on the current and target ambient temperatures.

[0044] The air spring pressure-holding valve test apparatus in the above embodiment can meet the test requirements within an environmental variation range of -40℃ to 80℃, performing an alternating cycle of air intake from 18 bar to 8 bar for 3 seconds, followed by air exhaust from 8 bar to the outside atmosphere for 3 seconds. In other words, this embodiment provides a test apparatus capable of stably providing gas pressure, automatically performing temperature alternation, and automatically executing air intake and exhaust actions.

[0045] According to another specific embodiment of this application, a test method for an air spring pressure-holding valve is also provided. The test method uses the aforementioned air spring pressure-holding valve test apparatus. Figure 2 As shown, the test method includes the following steps:

[0046] S1, detect the first initial height of the first accumulator body 11 and the second initial height of the second accumulator body 21;

[0047] S2, when both the first initial height and the second initial height meet the initial height conditions, adjust the temperature inside the environmental chamber 3 to a preset temperature, and perform a preset number of durability cycle tests at the preset temperature, wherein there are multiple preset temperatures;

[0048] The durability cycle test includes at least the following:

[0049] S21, adjust the first three-way valve 10 to connect the first accumulator body 11 with the test piece 4, and adjust the second three-way valve 20 to connect the second accumulator body 21 with the test piece 4;

[0050] S22, control the second accumulator body 21 to exhaust gas to the first accumulator body 11 through the second three-way valve 20, the tested component 4, and the first three-way valve 10 for a first preset time;

[0051] Optionally, the first preset duration is 3 seconds.

[0052] S23, adjust the first three-way valve 10 to connect the first accumulator body 11 with the test piece 4, and adjust the second three-way valve 20 to connect the test piece 4 with the outside atmosphere;

[0053] S24, control the first accumulator body 11 to exhaust gas to the outside atmosphere for a second preset time through the first three-way valve 10, the tested component 4, and the second three-way valve 20.

[0054] Optionally, the second preset duration is 3 seconds.

[0055] Through steps S1-S2, under the condition that both the first initial height and the second initial height meet the initial height conditions, a durability cycle test is performed at a preset temperature for a preset number of cycles. This allows the durability performance of the test component 4 to be tested under various temperatures. The preset number of cycles can be set according to actual needs, for example, 5000 cycles, 10000 cycles, etc.

[0056] It should be noted that in S2, after completing a preset number of durability cycle tests at a certain temperature, the temperature needs to be adjusted to another preset temperature value, and the preset number of durability cycle tests is performed again under this condition. The number of tests at different temperatures can be the same or different. In this embodiment, the test temperature includes at least two environments: extremely cold and extremely hot. Preferably, the test temperature range is -40℃ to 80℃.

[0057] Furthermore, the test methods used in the durability cycle testing process also include:

[0058] S31, detect the first current height of the first accumulator body 11;

[0059] S32, if the first current height is greater than the first threshold height, control the first three-way valve 10 to perform the exhaust action until the height of the first accumulator body 11 is less than or equal to the first preset height.

[0060] Through steps S31-S32, when the current height is greater than the first threshold height, the first three-way valve 10 performs an venting action to lower the height of the first accumulator body 11. This avoids safety issues caused by excessive height of the first accumulator body 11 and ensures normal testing. The first threshold height and the first preset height can be the same or different; for example, the first threshold height can be greater than the first preset height.

[0061] Furthermore, the test methods used in the durability cycle testing process also include:

[0062] S41, detect the second current height of the second accumulator body 21;

[0063] S42, when the second current height is less than the second threshold height, open the one-way valve 6 and control the air compressor 7 to charge the second accumulator body 21 until the height of the second accumulator body 21 is greater than or equal to the second preset height.

[0064] By using steps S41-S42, when the second current height is less than the second threshold height, the air compressor 7 is controlled to inflate the second accumulator body 21 to increase its height, thus preventing insufficient air supply to the second accumulator body 21 from causing subsequent test abnormalities. The second threshold height and the second preset height can be the same or different; for example, the second threshold height can be less than the second preset height.

[0065] This application also provides a preferred embodiment of an air spring pressure holding valve testing device, which realizes durability testing under a fixed pressure difference state at both ends of the pressure holding valve, while taking into account the influence of high and low temperature environments on durability, and realizes automated testing throughout the entire testing process.

[0066] like Figure 1As shown, the dashed lines represent signal lines, and the thin solid lines represent air paths. Specifically, the air spring pressure-holding valve test device consists of a first accumulator 1, a second accumulator 2, an air compressor 7, an ambient chamber 3, a first three-way valve 10, a second three-way valve 20, a single-way valve 6, an encoder, and connecting pipes and wiring. The encoder is the controller 5 in the aforementioned embodiment. Both the first three-way valve 10 and the second three-way valve 20 are two-position three-way valves.

[0067] The first accumulator 1 and the second accumulator 2 are each composed of a mass block of a specific mass, an accumulator body, and a height sensor.

[0068] The accumulator body is composed of a structure with the same function, such as a sleeve-type air spring, with a piston cross-section slope of 0 to ensure that the internal pressure of the accumulator remains constant during intake and exhaust. The volume of the first accumulator 1 at its initial height is greater than 2L to ensure sufficient air supply during operation; the volume of the second accumulator 2 at its initial height is greater than 4L to ensure sufficient air supply during operation and avoid frequent operation of the air compressor 7.

[0069] It should be noted that the accumulator is not limited to using air springs; it can also be a cylinder, as long as it maintains sufficient volume and effective area and can provide constant air pressure output and constant back pressure during operation.

[0070] The mass of the mass block needs to be matched with the effective cross-sectional dimensions of the piston in the accumulator body to ensure that the accumulator provides the specified gas pressure to meet the test requirements. For example, if the device needs to provide 8 bar back pressure, and the effective cross-sectional diameter is set to 80 mm, according to the calculation formula P = F / S, F = M * g = P * S = 8 * π * (80 / 2)^2, M = 8 * π * (80 / 2)^2 / 9.8 = 410, that is, the mass of the mass block needs to be matched to 410 kg.

[0071] The height of the first accumulator 1 is monitored by a height sensor. When the height exceeds the set value, the first three-way valve 10 is used to perform an exhaust action to the set threshold height. The height of the second accumulator 2 is monitored by a height sensor. When the height is lower than the set value, the compressor is used to replenish the accumulator until the set threshold height is reached.

[0072] The environmental chamber 3 consists of heating elements, cooling elements, and temperature sensors. Automatic temperature control can be achieved through an encoder.

[0073] The encoder is connected to the first height sensor 13, the second height sensor 23, the first three-way valve 10, the second three-way valve 20, the one-way valve 6, the environmental chamber 3, and the air compressor 7. In the air circuit, the first accumulator 1 is connected to the test object 4 and the atmosphere through the first three-way valve 10, and the second accumulator 2 is connected to the test object 4 and the atmosphere through the second three-way valve 20. The second accumulator 2 is also connected to the air compressor 7 through the one-way valve 6. The test object 4 is placed in the environmental chamber 3.

[0074] Figure 3 The control logic diagram of the air spring pressure holding valve test device in this embodiment is as follows: After the equipment is started, the system determines whether the initial heights of the first accumulator 1 and the second accumulator 2 meet the set requirements. If they do, the endurance cycle test is started, and the first three-way valve 10 is adjusted to perform the air intake action. The height status of the first accumulator 1 and the second accumulator 2 is checked again. If there are no problems, the second three-way valve 20 is adjusted to perform the exhaust action. Each cycle is counted once, and the count result determines whether to adjust the temperature of the ambient chamber 3 and whether to end the program. During the process, if the height of the first accumulator 1 is found to be too high, the first three-way valve 10 is adjusted to perform the exhaust action. If the height of the second accumulator 2 is found to be too low, the air compressor 7 and the one-way valve 6 are turned on to charge the second accumulator 2 to the set height.

[0075] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0076] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0077] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0078] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An air spring hold valve testing device, characterized by, include: An environmental chamber (3) is provided, in which the test object (4) is placed. The first accumulator (1) is connected to the test piece (4) and the outside atmosphere through the first three-way valve (10). The first accumulator (1) is used to generate the first constant air pressure P1. The second accumulator (2) is connected to the test piece (4) and the outside atmosphere through the second three-way valve (20). The second accumulator (2) is also connected to the air compressor (7) through the one-way valve (6). The second accumulator (2) is used to generate a second constant air pressure P2, where P1 < P2. The controller (5) is connected to the first three-way valve (10), the second three-way valve (20), the single-way valve (6), the environmental chamber (3), and the air compressor (7); The controller (5) controls the opening and closing of the first three-way valve (10) and the second three-way valve (20) so that the second accumulator (2) charges the first accumulator (1) through the test piece (4), and the first accumulator (1) exhausts gas to the outside atmosphere through the test piece (4) to conduct a durability test on the test piece (4). The first energy storage device (1) includes: The first accumulator body (11) is connected to the test piece (4) and the outside atmosphere through the first three-way valve (10). The first accumulator body (11) is either an air spring or a cylinder. The first accumulator body (11) is provided with a first piston. The effective cross-sectional area of ​​the first piston is S1, and the effective cross-sectional area of ​​the first piston remains unchanged during the movement. A first mass block (12) is detachably connected to the top of the first energy storage body (11), and the first mass block (12) has a first mass M1; Where M1*g=P1*S1, g is the acceleration due to gravity; The first height sensor (13) is used to detect the height of the first accumulator body (11) and is connected to the controller (5).

2. The air spring pressure-holding valve testing device according to claim 1, characterized in that, The second energy storage device (2) includes: The second accumulator body (21) is connected to the second three-way valve (20) and the single-way valve (6). The second accumulator body (21) is either the air spring or the cylinder. A second piston is provided inside the second accumulator body (21). The effective cross-sectional area of ​​the second piston is S2, and the effective cross-sectional area of ​​the second piston remains unchanged during the movement. The second mass block (22) is detachably connected to the top of the second accumulator body (21), and the second mass block (22) has a second mass M2; Where M2*g=P2*S2, g is the acceleration due to gravity; The second height sensor (23) is used to detect the height of the second accumulator body (21) and is connected to the controller (5).

3. The air spring pressure holding valve testing device according to claim 2, characterized in that, The slope of the cross sections of the first piston and the second piston is 0.

4. The air spring pressure holding valve testing device according to claim 2, characterized in that, P1=8 bar, P2=18 bar.

5. The air spring pressure holding valve testing device according to claim 4, characterized in that, The volume of the first accumulator body (11) at the initial height is V1, and the volume of the second accumulator body (21) at the initial height is V2, wherein V1 > 2L and V2 > 4L.

6. The air spring pressure holding valve testing device according to claim 1, characterized in that, The environmental chamber (3) is equipped with a heating element, a cooling element and a temperature sensor, and the heating element, the cooling element and the temperature sensor are all connected to the controller (5).

7. A test method for an air spring pressure-holding valve, characterized in that, The test method is performed using the air spring pressure-holding valve test apparatus according to any one of claims 1-6, and the test method includes the following steps: The first initial height of the first accumulator body (11) and the second initial height of the second accumulator body (21) are detected; When both the first initial height and the second initial height meet the initial height conditions, the temperature inside the environmental chamber (3) is adjusted to a preset temperature, and a preset number of durability cycle tests are performed at the preset temperature, wherein there are multiple preset temperatures; The durability cycle test includes at least the following: Adjust the first three-way valve (10) to connect the first accumulator body (11) with the test piece (4), and adjust the second three-way valve (20) to connect the second accumulator body (21) with the test piece (4); Control the second accumulator body (21) to exhaust gas to the first accumulator body (11) for a first preset time through the second three-way valve (20), the tested component (4), and the first three-way valve (10); Adjust the first three-way valve (10) to connect the first accumulator body (11) with the test piece (4), and adjust the second three-way valve (20) to connect the test piece (4) with the outside atmosphere; Control the first accumulator body (11) to exhaust gas to the outside atmosphere for a second preset time through the first three-way valve (10), the tested component (4), and the second three-way valve (20).

8. The test method for the air spring pressure-holding valve according to claim 7, characterized in that, During the durability cycle test, the test method further includes: Detect the first current height of the first accumulator body (11); When the first current height is greater than the first threshold height, the first three-way valve (10) is controlled to perform an exhaust action until the height of the first accumulator body (11) is less than or equal to the first preset height.

9. The test method for the air spring pressure-holding valve according to claim 8, characterized in that, During the durability cycle test, the test method further includes: Detect the second current height of the second accumulator body (21); When the second current height is less than the second threshold height, the one-way valve (6) is opened and the air compressor (7) is controlled to charge the second accumulator body (21) until the height of the second accumulator body (21) is greater than or equal to the second preset height.

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