Air spring airtightness detection device

Abstract

According to the air spring airtightness detection device provided by the invention, the pressure applying mechanism pushes the second positioning tool to move towards the first positioning tool, so that the air spring is clamped and fixed between the first positioning tool and the second positioning tool with a pre-tightening force; meanwhile, the air spring is expanded to the air tightness detection state only by inflating the air spring for pressure maintaining, the air pressure in the air spring is detected in real time only by using the detection system, and the detection system can compare the detected pressure value with a preset standard pressure value so as to judge whether the air tightness of the air spring is qualified or not; the whole inflated air spring does not need to be manually put into water, and the air leakage phenomenon of the air spring does not need to be detected by manually observing whether continuous air bubbles emerge around equipment, so that the air tightness detection working intensity of the air spring is effectively reduced, the detection procedures are reduced, and the air tightness detection efficiency of the air spring is improved; and the accuracy and precision of air tightness detection of the air spring can be improved.

Description

Technical Field

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

[0002] Air springs are springs made from the elasticity of compressed air. They are currently widely used in self-adjusting air suspensions for passenger cars. The quality of air springs often determines the ride comfort of passenger cars, and the air tightness of air springs directly determines the quality of the entire air spring. Currently, when testing the air tightness of air springs, the assembled air springs are generally installed on the tooling manually, the air springs are adjusted to the working height, and air is inflated into the air springs. The inflated air springs are then placed in water as a whole. It is necessary to manually observe whether there are continuous bubbles around the equipment to detect whether the air springs are leaking. This not only results in low efficiency of air tightness testing due to high work intensity, but is also prone to defects in accuracy and precision of air tightness testing. Summary of the invention

[0003] Based on the above-mentioned problems existing in the prior art, the purpose of an embodiment of the present invention is to provide an air spring air tightness detection device to solve the problems in the prior art that the air spring air tightness detection work intensity is high, resulting in low air tightness detection efficiency, and the accuracy and precision of air spring air tightness detection are low.

[0004] To achieve the above object, the technical solution adopted by the present invention is to provide an air spring air tightness detection device, comprising:

[0005] Test bench;

[0006] A first positioning tool is arranged on the test bench;

[0007] A second positioning tool, used to cooperate with the first positioning tool to clamp and position the air spring at the air tightness detection station on the test bench;

[0008] A pressure mechanism, used for pushing the second positioning fixture to move toward the first positioning fixture, and applying a force to compress the air spring on the first positioning fixture, so as to clamp and fix the air spring between the first positioning fixture and the second positioning fixture with a pre-tightening force, and the second positioning fixture is connected to a power output end of the pressure mechanism;

[0009] An air charging system, used to charge the air spring with air so that the air pressure inside the air spring is maintained at a preset pressure value; and

[0010] The detection system is used to detect the air pressure inside the air spring in real time, and compare the detected pressure value with a preset standard pressure value to determine whether the air tightness of the air spring is qualified.

[0011] Furthermore, the pressure-applying mechanism includes a support frame arranged on the test bench and a linear drive mechanism arranged on the support frame, and the second positioning fixture is connected to a power output end of the linear drive mechanism.

[0012] Furthermore, the linear drive mechanism is an electric cylinder, which includes a cylinder body fixedly arranged on the support frame, a drive motor arranged on the cylinder body and a telescopic rod installed in the cylinder body, and the air spring air tightness detection device also includes a guide mechanism for guiding the axial movement of the telescopic rod.

[0013] Furthermore, the guide mechanism includes a plurality of guide columns arranged in parallel and at intervals on the test bench and a positioning member fixedly connected to one end of the telescopic rod away from the cylinder body, each of the guide columns having a first end away from the test bench and a second end close to the test bench along its axial direction, the first end of each of the guide columns being slidably mounted on the support frame along the axial direction, and the second end of each of the guide columns being fixedly connected to the positioning member.

[0014] Furthermore, the positioning member is a positioning plate, and the projections of a plurality of the guide columns connected in sequence on the positioning plate can form a regular polygon, and the projection of the telescopic rod on the positioning plate is located at the geometric center of the regular polygon.

[0015] Furthermore, the air spring air tightness detection device also includes a photoelectric detection device or a probe detector for detecting whether the air spring reaches a preset expansion diameter after being inflated.

[0016] Furthermore, the inflation system includes an air source, an air tank connected to the air source, an air pipe connecting the air tank to the air spring, and a control valve for controlling the opening or closing of the air tank. The air spring is pressure tested for 24 hours, and the detection system detects that the pressure drop of the air spring is less than or equal to 0.02MPa, which is qualified.

[0017] Furthermore, the detection system includes a pressure sensor for detecting the internal pressure of the air spring, a data storage device for recording the detection data of the pressure sensor, a processor for comparing the pressure data recorded in the data storage device with a preset standard pressure value, and a display device for displaying a graph of the internal pressure of the air spring changing over time.

[0018] Furthermore, the first positioning fixture is provided with a first positioning groove for accommodating and positioning the bottom end of the air spring, and the second positioning fixture is provided with a second positioning groove for accommodating and positioning the top end of the air spring. The air spring air tightness detection device also includes a first seal for closing the bottom end opening of the air spring and a second seal for closing the top end opening of the air spring. The first positioning fixture presses the first seal into the bottom end opening of the air spring with a pre-tightening force, and the second positioning fixture presses the second seal into the top end opening of the air spring with a pre-tightening force.

[0019] Furthermore, the first positioning fixture is provided with a mounting hole for matching and connecting an inflation joint, the air spring is provided with an inflation hole connected to the inflation joint, and the inflation joint is connected to an air supply pipe of the inflation system.

[0020] Compared with the prior art, the one or more technical solutions in the embodiments of the present invention have at least one of the following beneficial effects:

[0021] The air spring air tightness detection device in the embodiment of the present invention pushes the second positioning fixture toward the first positioning fixture through the pressure-applying mechanism, so that the air spring is clamped and fixed between the first positioning fixture and the second positioning fixture with a preload force. At the same time, the air spring only needs to be expanded to the air tightness detection state by inflating and maintaining the pressure in the air spring. It only needs to use the detection system to detect the air pressure inside the air spring in real time, and the detection system can compare the detected pressure value with the preset standard pressure value to determine whether the air tightness of the air spring is qualified. There is no need to manually put the inflated air spring into water as a whole, and there is no need to manually observe whether there is continuous air bubbling around the equipment to detect whether the air spring has any leakage. This not only effectively reduces the workload of air spring air tightness detection, reduces the detection process, and improves the efficiency of air spring air tightness detection, but also can improve the accuracy and precision of air spring air tightness detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 A schematic diagram of the three-dimensional structure of an air spring air tightness detection device provided in an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the main structure of an air spring air tightness detection device provided by an embodiment of the present invention;

[0025] Figure 3 A schematic side view of the structure of an air spring air tightness detection device provided by an embodiment of the present invention;

[0026] Figure 4 An assembly diagram of a pressure mechanism and a guide mechanism provided in an embodiment of the present invention;

[0027] Figure 5 Another assembly diagram of the pressure mechanism and the guide mechanism provided by the embodiment of the present invention;

[0028] Figure 6 A schematic diagram of the structure of a first positioning fixture and a second positioning fixture supporting a positioning air spring provided in an embodiment of the present invention;

[0029] Figure 7 A schematic diagram of the three-dimensional structure of an air spring provided in an embodiment of the present invention;

[0030] Figure 8 Another schematic diagram of the three-dimensional structure of the air spring provided in an embodiment of the present invention.

[0031] Among them, the reference numerals in the figure are:

[0032] 1- Test bench;

[0033] 2-first positioning tool; 21-first positioning groove; 22-mounting hole;

[0034] 3-second positioning tool; 31-second positioning groove;

[0035] 4-pressure mechanism; 41-support frame; 42-linear drive mechanism; 421-cylinder body; 422-drive motor; 423-telescopic rod;

[0036] 5- inflation system; 51- gas tank;

[0037] 6-detection system; 61-processor; 62-display;

[0038] 7-guide mechanism; 71-guide column; 72-positioning member; 73-sliding sleeve;

[0039] 8-first seal; 9-second seal; 10-air spring;

[0040] 20-probe detector; 30-explosion-proof warehouse; 40-explosion-proof safety door. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] It should be noted that when an element is referred to as being "connected to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0043] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined. The meaning of "plurality" is one or more, unless otherwise clearly and specifically defined.

[0044] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] Reference throughout the specification to "one embodiment" or "an embodiment" means that the specialized features, structures, or characteristics described in connection with the embodiment are included in at least one embodiment of the present application. Thus, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, not all of which refer to the same embodiment. Furthermore, in one or more embodiments, the specialized features, structures, or characteristics may be combined in any suitable manner.

[0047] Please also read Figures 1 to 6 The air spring 10 air tightness detection device provided by the embodiment of the present invention is now described. Figure 1 , Figure 2 and Figure 3The air spring 10 air tightness detection device provided by the embodiment of the present invention includes a test bench 1, a first positioning fixture 2, a second positioning fixture 3, a pressure mechanism 4, an inflation system 5 and a detection system 6. The first positioning fixture 2 is arranged on the test bench 1, and the second positioning fixture 3 can be arranged on the test bench 1 so as to be movable up and down, so that the second positioning fixture 3 can cooperate with the first positioning fixture 2 to clamp and position the air spring 10 at the air tightness detection station on the test bench 1. The second positioning fixture 3 is connected to the power output end of the pressure mechanism 4, and the pressure mechanism 4 can push the second positioning fixture 3 to move toward the first positioning fixture 2, and the pressure mechanism 4 can apply a force to compress the air spring 10 placed on the first positioning fixture 2, so as to clamp and fix the air spring 10 between the first positioning fixture 2 and the second positioning fixture 3 with a preload force. The inflation system 5 is used to inflate the air spring 10 so that the air pressure inside the air spring 10 maintains a preset pressure value. The detection system 6 is used to detect the air pressure inside the air spring 10 in real time, and the detection system 6 can compare the detected pressure value with the preset standard pressure value to determine whether the air tightness of the air spring 10 is qualified. When performing air tightness detection on the air spring 10, it is only necessary to first position the air spring 10 to be detected on the first positioning fixture 2, and then push the second positioning fixture 3 toward the first positioning fixture 2 through the pressure mechanism 4, until the air spring 10 to be detected reaches the preset product design height, and then inflate the air spring 10 to be detected through the inflation system 5. Next, the pressure mechanism 4 can apply a force to compress the air spring 10 placed on the first positioning fixture 2, so that the air spring 10 is clamped and fixed between the first positioning fixture 2 and the second positioning fixture 3 with a preload, and then the air spring 10 to be tested is continuously inflated through the inflation system 5 until the pressure in the air spring 10 to be tested reaches 1.5 times the design standard pressure of the air spring 10, and the pressure is maintained for 30 seconds to stabilize, and an air tightness test is performed after it stabilizes. During the air tightness test, the air pressure inside the air spring 10 is detected in real time by the detection system 6, and the detection system 6 can compare the detected pressure value with the preset standard pressure value to determine whether the air tightness of the air spring 10 is qualified.

[0048] Compared with the prior art, the air tightness detection device for air spring 10 provided in the embodiment of the present invention pushes the second positioning fixture 3 toward the first positioning fixture 2 through the pressure-applying mechanism 4, so that the air spring 10 is clamped and fixed between the first positioning fixture 2 and the second positioning fixture 3 with a preload force. At the same time, the air spring 10 only needs to be expanded to the air tightness detection state by inflating and pressurizing the air spring 10. It only needs to use the detection system 6 to detect the air pressure inside the air spring 10 in real time, and the detection system 6 can compare the detected pressure value with the preset standard pressure value to determine whether the air tightness of the air spring 10 is qualified. There is no need to manually put the inflated air spring 10 into water as a whole, nor is there any need to manually observe whether there is continuous air bubbling around the equipment to detect whether the air spring 10 has leakage. This not only effectively reduces the workload of air tightness detection of the air spring 10, reduces the detection process, and improves the efficiency of air tightness detection, but also can improve the accuracy and precision of air tightness detection of the air spring 10.

[0049] Please refer to further Figure 4 , Figure 5 and Figure 6 In some embodiments, the pressure mechanism 4 includes a support frame 41 provided on the test bench 1 and a linear drive mechanism 42 provided on the support frame 41, and the second positioning fixture 3 is connected to the power output end of the linear drive mechanism 42. It should be noted that the linear drive mechanism 42 can be but is not limited to a linear drive module such as a cylinder, a hydraulic cylinder, an electric cylinder or an electric push rod. An explosion-proof bin 30 is also provided on the test bench 1, and an explosion-proof safety door 40 is provided on the explosion-proof bin 30. The pressure mechanism 4, the first positioning fixture 2 and the second positioning fixture 3 are all located in the explosion-proof bin 30. When performing an air tightness test on the air spring 10, it is only necessary to close the explosion-proof safety door 40, so that the test personnel can stay away from the air spring 10, thereby ensuring the life safety of the test personnel.

[0050] Please refer to further Figure 4 , Figure 5 and Figure 6In some embodiments, the linear drive mechanism 42 is an electric cylinder, which includes a cylinder body 421 fixedly arranged on the support frame 41, a drive motor 422 arranged on the cylinder body 421, and a telescopic rod 423 installed in the cylinder body 421. The air tightness detection device of the air spring 10 also includes a guide mechanism 7 for guiding the axial movement of the telescopic rod 423. Specifically, the guide mechanism 7 includes a plurality of guide columns 71 arranged on the test bench 1 in parallel and at intervals, and a positioning member 72 fixedly connected to an end of the telescopic rod 423 away from the cylinder body 421. Each guide column 71 has a first end away from the test bench 1 and a second end close to the test bench 1 along its axial direction. The first end of each guide column 71 can be slidably installed on the support frame 41 along the axial direction, and the second end of each guide column 71 is fixedly connected to the positioning member 72. The guide mechanism 7 guides the telescopic rod 423 to drive the second positioning fixture 3 to move toward the first positioning fixture 2 in a straight line, which can enhance the stability of the second positioning fixture 3 and the first positioning fixture 2 to clamp and fix the air spring 10 with a pre-tightening force, and effectively prevent the second positioning fixture 3 from swinging or shifting in position during the movement toward the first positioning fixture 2, thereby causing the air spring 10 to slip off and cause damage to the air spring 10. Specifically, the support frame 41 is provided with a sliding sleeve 73 that slidably cooperates with each guide column 71, which can reduce the sliding friction of the guide column 71.

[0051] It can be understood that in some embodiments, the positioning member 72 is a positioning plate, and the projections of multiple guide columns 71 connected in sequence on the positioning plate can form a regular polygon. The projection of the telescopic rod 423 on the positioning plate is located at the geometric center of the regular polygon, which can further enhance the stability of the second positioning fixture 3 and the first positioning fixture 2 in clamping and fixing the air spring 10 with a preload force, and effectively prevent the second positioning fixture 3 from swinging or shifting in position during the process of moving toward the first positioning fixture 2, causing the air spring 10 to slip and cause damage to the air spring 10.

[0052] Please refer to further Figure 1 , Figure 2 and Figure 6In some embodiments, the air tightness detection device of the air spring 10 further includes a photoelectric detection device or a probe detector 20 for detecting whether the air spring 10 reaches a preset expansion diameter after inflation. The diameter of the air spring 10 after inflation is detected by the photoelectric detection device or the probe detector 20. When the diameter of the air spring 10 after inflation reaches the detection standard, the photoelectric detection device or the probe detector 20 will feedback a signal to the processor 61 of the detection system 6. The processor 61 of the detection system 6 will control the inflation system 5 to stop inflation according to the feedback signal of the photoelectric detection device or the probe detector 20, so as to prevent the inflation system 5 from over-inflating the air spring 10 and causing danger. In addition, when the diameter of the inflated air spring 10 does not meet the detection standard, the photoelectric detection device or the probe detector 20 will feedback a signal to the processor 61 of the detection system 6. The processor 61 of the detection system 6 will control the inflation system 5 to continuously inflate the air spring 10 according to the feedback signal of the photoelectric detection device or the probe detector 20, so as to automatically control the inflation process of the air spring 10, improve the detection efficiency, and at the same time enable the detection personnel to stay away from the inflated air spring 10, thereby ensuring the life safety of the detection personnel.

[0053] Please refer to further Figure 1 , Figure 2 and Figure 3 In some embodiments, the inflation system 5 includes an air source, an air tank 51 connected to the air source, an air pipe connecting the air tank 51 to the air spring 10, and a control valve for controlling the opening or closing of the air tank 51. The air spring 10 is pressure tested for 24 hours, and the detection system 6 detects that the pressure drop of the air spring 10 is less than or equal to 0.02MPa to be qualified.

[0054] Please refer to further Figure 1 , Figure 2 and Figure 3 In some embodiments, the detection system 6 includes a pressure sensor for detecting the internal pressure of the air spring 10, a data storage device for recording the detection data of the pressure sensor, a processor 61 for comparing the pressure data recorded by the data storage device with a preset standard pressure value, and a display 62 for displaying a graph of the internal pressure of the air spring 10 changing over time. The pressure sensor can detect the internal pressure of the air spring 10 in real time, and the display 62 can display the data collected by the pressure sensor in the form of a graph of the internal pressure of the air spring 10 changing over time, so that the detection personnel can intuitively observe the changes in the air pressure inside the air spring 10 to realize the air tightness detection of the air spring 10, and improve the accuracy and precision of the air tightness detection of the air spring 10. It should be noted that the processor 61 can be but not limited to a computer, and the display 62 can be but not limited to a touch screen.

[0055] Please refer to further Figure 4 , Figure 5 and Figure 6 In some embodiments, in order to enhance the stability of the first positioning fixture 2 and the second positioning fixture 3 in clamping and positioning the air spring 10 and prevent the air spring 10 clamped and positioned between the first positioning fixture 2 and the second positioning fixture 3 from slipping, the first positioning fixture 2 is provided with a first positioning groove 21 for accommodating and positioning the bottom end of the air spring 10, and the second positioning fixture 3 is provided with a second positioning groove 31 for accommodating and positioning the top end of the air spring 10. In addition, please refer to Figure 7 and Figure 8 In some embodiments, the air tightness detection device for air spring 10 also includes a first seal 8 for closing the bottom opening of the air spring 10 and a second seal 9 for closing the top opening of the air spring 10. The first positioning tool 2 presses the first seal 8 into the bottom opening of the air spring 10 with a pre-tightening force, and the second positioning tool 3 presses the second seal 9 into the top opening of the air spring 10 with a pre-tightening force, thereby effectively preventing the air spring 10 from leaking during the air tightness detection and affecting the accuracy of the air tightness detection.

[0056] Please refer to further Figure 4 In some of the embodiments, in order to facilitate the inflation of the air spring 10, the first positioning tool 2 is provided with a mounting hole 22 for matching the connection of the inflation connector, and the air spring 10 is provided with an inflation hole connected to the inflation connector, and the inflation connector is connected to the air pipe of the inflation system 5.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An air spring air tightness detection device, characterized in that: include: Test bench; A first positioning tool is arranged on the test bench; A second positioning tool, used to cooperate with the first positioning tool to clamp and position the air spring at the air tightness detection station on the test bench; A pressure mechanism, used for pushing the second positioning fixture to move toward the first positioning fixture, and applying a force to compress the air spring on the first positioning fixture, so as to clamp and fix the air spring between the first positioning fixture and the second positioning fixture with a pre-tightening force, and the second positioning fixture is connected to a power output end of the pressure mechanism; An air charging system, used to charge the air spring so that the air pressure inside the air spring is maintained at a preset pressure value; as well as The detection system is used to detect the air pressure inside the air spring in real time, and compare the detected pressure value with a preset standard pressure value to determine whether the air tightness of the air spring is qualified.

2. The air spring air tightness detection device according to claim 1, characterized in that: The pressure mechanism includes a support frame arranged on the test bench and a linear drive mechanism arranged on the support frame, and the second positioning fixture is connected to the power output end of the linear drive mechanism.

3. The air spring air tightness detection device according to claim 2, characterized in that: The linear drive mechanism is an electric cylinder, which includes a cylinder body fixedly arranged on the support frame, a drive motor arranged on the cylinder body and a telescopic rod installed in the cylinder body. The air spring air tightness detection device also includes a guide mechanism for guiding the axial movement of the telescopic rod.

4. The air spring air tightness detection device according to claim 3, characterized in that: The guide mechanism includes a plurality of guide columns arranged in parallel and at intervals on the test bench and a positioning member fixedly connected to one end of the telescopic rod away from the cylinder body, each of the guide columns has a first end away from the test bench and a second end close to the test bench along its axial direction, the first end of each of the guide columns can be slidably installed on the support frame along the axial direction, and the second end of each of the guide columns is fixedly connected to the positioning member.

5. The air spring air tightness detection device according to claim 4, characterized in that: The positioning member is a positioning plate. The projections of a plurality of guide posts connected in sequence on the positioning plate can form a regular polygon. The projection of the telescopic rod on the positioning plate is located at the geometric center of the regular polygon.

6. The air spring air tightness detection device according to claim 1, characterized in that: The air spring air tightness detection device also includes a photoelectric detection device or a probe detector for detecting whether the air spring reaches a preset expansion diameter after being inflated.

7. The air spring air tightness detection device according to claim 1, characterized in that: The inflation system includes an air source, an air tank connected to the air source, an air pipe connecting the air tank to an air spring, and a control valve for controlling the opening or closing of the air tank. The air spring is pressure tested for 24 hours, and the air spring is qualified if the detection system detects that the pressure drop is less than or equal to 0.02MPa.

8. The air spring air tightness detection device according to claim 1, characterized in that: The detection system includes a pressure sensor for detecting the internal pressure of the air spring, a data storage device for recording the detection data of the pressure sensor, a processor for comparing the pressure data recorded by the data storage device with a preset standard pressure value, and a display device for displaying a graph of the internal pressure of the air spring changing over time.

9. The air spring air tightness detection device according to claim 1, characterized in that: The first positioning fixture is provided with a first positioning groove for accommodating and positioning the bottom end of the air spring, and the second positioning fixture is provided with a second positioning groove for accommodating and positioning the top end of the air spring. The air spring air tightness detection device also includes a first seal for closing the bottom end opening of the air spring and a second seal for closing the top end opening of the air spring. The first positioning fixture presses the first seal into the bottom end opening of the air spring with a pre-tightening force, and the second positioning fixture presses the second seal into the top end opening of the air spring with a pre-tightening force.

10. The air spring air tightness detection device according to any one of claims 1 to 9, characterized in that: The first positioning fixture is provided with a mounting hole for matching and connecting an inflation joint, the air spring is provided with an inflation hole connected to the inflation joint, and the inflation joint is connected to the air supply pipe of the inflation system.

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