A device for detecting the air tightness of an air spring seat of a metro car

Abstract

The utility model relates to urban rail vehicle air spring seat air tightness test equipment technical field, especially in kind of device for detecting urban rail vehicle air spring seat air tightness. The device includes detection platform, is provided with two groups of air tightness detection device on the detection platform, two groups of air tightness detection device all include air spring seat positioning assembly, air supply pipe support assembly, air spring seat compression assembly, air supply pipe compression assembly, air supply pipe jacking assembly and gas supply assembly, and air spring seat positioning assembly and air supply pipe support assembly are movably installed on the detection platform, and air supply pipe compression assembly is movably installed on the side of detection platform, and air supply pipe jacking assembly is installed in one end of detection platform, and air spring seat compression assembly is compressed air spring seat through sealing compression block, and the sealing compression block is provided with the air passage that links up with gas supply assembly and air spring seat in. The utility model clamps nimblely, can adapt to different specifications air spring seat, ensures the stability of detection process, can satisfy two sets of product pressure test simultaneously, improves detection efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of air tightness testing equipment for urban rail car air spring seats, and in particular to a device for testing the air tightness of urban rail car air spring seats. Background Technology

[0002] In the rail transit industry, the airtightness of the air spring seats in urban rail vehicles is crucial to the stability, safety, and passenger comfort of the vehicle. Poor airtightness of the air spring seats can lead to a decline in the performance of the air springs, causing problems such as increased vehicle vibration and poor ride smoothness, and may even affect the normal operation of related components such as the braking system.

[0003] Currently, there is a certain demand in the industry for air tightness testing of urban rail car spring seats, and various testing technologies and devices have been developed, such as differential pressure testing: simultaneously testing the tested part and a standard part and comparing the pressure difference; water immersion / soap water testing: immersing in water to observe bubbles or applying soap water to detect leak points; ultrasonic testing: capturing the ultrasonic signals generated by the leak to locate the leak point. However, the following problems still exist when using the above-mentioned existing technologies to test the air tightness of spring seats:

[0004] 1. The testing equipment has poor versatility and can only be adapted to specific specifications or models of air spring seats. Different testing fixtures or equipment need to be changed for different specifications or models of air spring seats, which increases the testing cost and cycle.

[0005] 2. Inconvenient handling: Some testing devices are bulky and heavy, making them difficult to move and adjust on the production site, which affects testing efficiency. Therefore, there is room for improvement in related testing technologies and devices.

[0006] Chinese patent application number 202311066220.X discloses a device and method for detecting the airtightness of a rail vehicle body sleeper beam. It includes a pressure-holding device and a sleeper beam sealing device. An air spring inlet pipe is installed on the sleeper beam, comprising a sleeper beam air spring bushing hole, a first vent hole, and a second vent hole. A sleeper beam air spring bushing is installed in the air spring bushing hole and sealed by an air spring guide post sealing plug. A first pipe joint is installed in the first vent hole and sealed by a pipe plug. A second pipe joint is installed in the second vent hole, and one end of the second pipe joint is connected to a reducing connector. The other end of the reducing connector is connected to the pressure-holding device via an outlet pipe, and a first pressure gauge is installed on the outlet pipe. This device can perform air tightness testing on the air spring intake pipe and the vehicle body bolster, but it does not specify the clamping and fixing method of the air spring seat and the air spring intake pipe. During the test, the air spring seat and the air spring intake pipe may be displaced or loosened, which will affect the accuracy and reliability of the air tightness test. In addition, it can only test one air spring seat and air spring intake pipe at a time, which is not efficient. Furthermore, the test process involves the sealing and connection of multiple components, making the operation steps relatively complicated. Utility Model Content

[0007] The purpose of this invention is to solve the technical problems of existing urban rail car air spring seat air tightness testing equipment, such as poor versatility, inconvenient transportation, low testing efficiency, and relatively complex operation steps. It provides a device for testing the air tightness of urban rail car air spring seats. Its installation and clamping method is flexible and stable, can adapt to air spring seats of different specifications, and ensures stability and sealing during the air tightness testing process. The platform can simultaneously meet the pressure holding test of two sets of products, which greatly saves the waiting time for pressure holding test and improves the testing efficiency.

[0008] The technical solution adopted by this utility model to achieve the above-mentioned objective is as follows: a device for testing the air tightness of the spring seat of a light rail car, comprising a testing platform, on which two sets of air tightness testing devices are provided. Each set of air tightness testing devices includes a spring seat positioning component, an air supply pipe support component, a spring seat pressing component, an air supply pipe pressing component, an air supply pipe tightening component, and an air supply component. The spring seat positioning component and the air supply pipe support component are movably mounted on the testing platform. The air supply pipe pressing component is movably mounted on the side of the testing platform. The air supply pipe tightening component is mounted at the end of the testing platform. The spring seat pressing component and the air supply component are respectively mounted on a bracket. The bracket is mounted on the testing platform and is located close to the spring seat positioning component. The spring seat pressing component presses the spring seat through a sealing block. The sealing block is connected to the upper end of the spring seat, and an air passage communicating with the air supply component and the spring seat is provided inside the sealing block.

[0009] Furthermore, the air spring seat positioning assembly includes positioning blocks, and two positioning blocks are provided. Each positioning block has a strip-shaped hole, and a first adjusting bolt passes through the strip-shaped hole. The detection platform has symmetrically provided inclined strip-shaped adjusting holes. The positioning blocks are inclinedly installed at the strip-shaped adjusting holes by the first adjusting bolt and the first fastening nut.

[0010] Furthermore, the air supply duct support assembly includes two sets of support adjustment components, each set including an adjustment block and a support plate. There are two adjustment blocks, each with a threaded hole. A second adjustment bolt passes through the threaded hole. A strip groove is provided on the detection platform. The adjustment block is installed in the strip groove by the second adjustment bolt and the second fastening nut. The support plate is inserted between the two adjustment blocks, and the upper end of the support plate has an arc-shaped groove that matches the air supply duct.

[0011] Furthermore, the support plate includes a first support plate and a second support plate. The upper end of the first support plate is provided with a first arc-shaped groove, and the upper end of the second support plate is provided with a second arc-shaped groove. The curvature of the first arc-shaped groove and the curvature of the second arc-shaped groove are different.

[0012] Furthermore, the air spring seat clamping assembly includes a mounting base, a first clamping nut, and a first clamping bolt. The mounting base is mounted on a bracket, and a vertical first clamping nut is installed at the end of the mounting base. The first clamping nut is threadedly connected to the first clamping bolt, and a first clamping head is provided at the lower end of the first clamping bolt.

[0013] Furthermore, the air supply pipe clamping assembly includes a mounting plate, a first base, an L-shaped support arm, a second clamping nut, and a second clamping bolt. The mounting plate is installed on the side of the testing platform and has multiple mounting screw holes arranged in two rows. The first base is installed on the mounting screw holes by mounting bolts. One end of the L-shaped support arm is installed on the first base, and the other end of the L-shaped support arm is fitted with a vertical second clamping nut. The second clamping nut is threadedly connected to the second clamping bolt, and the lower end of the second clamping bolt is provided with a second clamping head.

[0014] Furthermore, the air supply pipe clamping assembly also includes a clamping block, and the second clamping head clamps the air supply pipe through the clamping block. The clamping block includes a first clamping block and a second clamping block. The lower end of the first clamping block is provided with a third arc-shaped groove, and the lower end of the second clamping block is provided with a fourth arc-shaped groove. The curvature of the third arc-shaped groove and the curvature of the fourth arc-shaped groove are different.

[0015] Furthermore, the air supply pipe tightening assembly includes a second base, a strip-shaped support arm, a tightening nut, and a tightening bolt. The second base is installed at one end of the testing platform. The strip-shaped support arm is installed on the second base in an adjustable manner. The tightening nut is horizontally installed at the upper end of the strip-shaped support arm. The tightening bolt is threaded onto the tightening nut. The front end of the tightening bolt is provided with a tightening head. The tightening head tightens the air supply pipe through a pipe plug. The pipe plug is connected to the end of the air supply pipe.

[0016] Furthermore, the air supply pipe tightening assembly also includes a tightening block for tightening the air supply pipe.

[0017] Furthermore, the air supply assembly includes a mounting base, an air supply line, and an air supply hose. The mounting base is mounted on a bracket, and the air supply line is hung on the mounting base. A pressure gauge and a valve are installed on the air supply line. One end of the air supply line is connected to the air supply device, and the other end of the air supply line is connected to one end of the air supply hose. The other end of the air supply hose is connected to the air passage inside the sealing block.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] (1) This utility model provides a device for testing the air tightness of the air spring seat of a city rail car. The testing platform is equipped with an air spring seat positioning component, an air supply pipe support component, an air spring seat clamping component, an air supply pipe clamping component, and an air supply pipe top clamping component. Through the positioning and clamping cooperation between the components, the testing position of the product can be better defined. The installation and clamping method of this device is flexible and stable, and can adapt to air spring seats of different specifications. It can also ensure stability and sealing in the air tightness testing process. The platform can simultaneously meet the pressure holding test of two sets of products, which greatly saves the waiting time for the pressure holding test and improves the testing efficiency.

[0020] (2) This utility model provides a device for testing the air tightness of the air spring seat of a city rail vehicle. The positioning block is adjustablely set on the testing platform. The positioning size can be adjusted according to the diameter of the air spring seat to ensure the accurate positioning of the air spring seat in the horizontal direction. This ensures that the air spring seat pressing component can achieve a tight fit with the air spring seat through the sealing pressure block above it, thus improving the versatility of the device.

[0021] (3) This utility model provides a device for testing the air tightness of the air spring seat of a city rail car. The sealing block is designed to press from the top, which not only makes it easy to observe whether the block and the product are aligned and improves the alignment time of the sealing block, but also ensures the sealing performance. The sealing block is tightly fitted to the air spring seat by tightening bolts, which can ensure reliable sealing.

[0022] (4) This utility model provides a device for testing the air tightness of the air spring seat of a city rail car. The adjusting block is adjustable and set on the testing platform. It can adjust the position according to different models of air supply pipes. At the same time, it can replace the matching support plate according to different models of air supply pipes to adapt to air supply pipes of different diameters. The support plate is designed as a detachable structure, which is convenient to replace and can save the time of changing the type. It is suitable for pressure holding tests of air supply pipes in multiple projects.

[0023] (5) The present invention provides a device for testing the air tightness of the air spring seat of a city rail vehicle. The end air supply pipe clamping component is designed with an adjustable height structure, which can meet the clamping operation of air supply pipes at different heights, thereby ensuring the sealing reliability during the testing process, improving the testing accuracy, and enhancing the overall performance of the device. Attached Figure Description

[0024] Figure 1 This is a structural diagram of the device for detecting the airtightness of the air spring seat in a light rail vehicle.

[0025] Figure 2 This is a top view of the device for detecting the airtightness of the air spring seat of a light rail vehicle according to this utility model.

[0026] Figure 3 This is a bottom view of the device for detecting the airtightness of the air spring seat of a light rail car according to this utility model.

[0027] Figure 4 This is a schematic diagram illustrating the application of the present invention in the device for detecting the airtightness of the air spring seat in urban rail vehicles.

[0028] In the diagram: 1. Detection platform, 101. Strip-shaped adjustment hole, 102. Strip-shaped groove, 2. Bracket, 3. Positioning block, 301. Strip-shaped hole, 4. First adjusting bolt, 5. First fastening nut, 6. Adjusting block, 7. Second adjusting bolt, 8. Second fastening nut, 9. First support plate, 901. First arc-shaped groove, 10. Second support plate, 1001. Second arc-shaped groove, 11. Mounting base, 12. First clamping nut, 13. First clamping bolt, 14. First clamping head, 15. Mounting plate, 1501. Mounting screw hole, 16. First base, 17. Mounting bolt, 18. L-shaped support 19. Arm, 20. Second clamping nut, 21. Second clamping bolt, 22. Second clamping head, 22. First clamping block, 2201. Third arc-shaped groove, 23. Second clamping block, 2301. Fourth arc-shaped groove, 24. Second base, 25. Strip arm, 2501. Strip groove, 26. Pin, 27. Tightening nut, 28. Tightening bolt, 29. Tightening head, 30. Pipe plug, 31. Tightening block, 32. Mounting seat, 33. Ventilation pipe, 34. Ventilation hose, 35. Pressure gauge, 36. Valve, 37. Sealing block, 38. Lifting ring, 39. Air spring seat, 40. Air supply pipe. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments, but the present invention is not limited to the specific embodiments.

[0030] like Figure 1-3 The device shown is for testing the air tightness of spring seats in urban rail vehicles. It includes a testing platform 1, on which two sets of air tightness testing devices are installed. Each set of air tightness testing devices includes a spring seat positioning component, an air supply pipe support component, a spring seat pressing component, an air supply pipe pressing component, an air supply pipe tightening component, and an air supply component. The spring seat positioning component and the air supply pipe support component are movably installed on the testing platform 1. The air supply pipe pressing component is movably installed on the side of the testing platform 1. The air supply pipe tightening component is installed at the end of the testing platform 1. The spring seat pressing component and the air supply component are respectively installed on a bracket 2. The bracket 2 is installed on the testing platform 1 and is located close to the spring seat positioning component. The spring seat pressing component presses the spring seat 39 through a sealing block 37. The sealing block 37 is connected to the upper end of the spring seat 39. An air passage communicating with the air supply component and the spring seat 39 is provided inside the sealing block 37.

[0031] The air spring seat positioning assembly includes positioning blocks 3. There are two positioning blocks 3. Each positioning block 3 has a strip hole 301. A first adjusting bolt 4 passes through the strip hole 301. The detection platform 1 has symmetrically inclined strip adjusting holes 101. The positioning blocks 3 are inclinedly installed at the strip adjusting holes 101 by the first adjusting bolt 4 and the first fastening nut 5.

[0032] The positioning block is adjustable on the detection platform, and the positioning size can be adjusted according to the diameter of the air spring seat to ensure the precise positioning of the air spring seat in the horizontal direction. This ensures that the air spring seat pressing component can achieve a tight fit with the air spring seat through the sealing pressure block above it, thus improving the versatility of the device.

[0033] The air supply duct support assembly includes two sets of support adjustment components, each including an adjustment block 6 and a support plate. There are two adjustment blocks 6, each with a threaded hole. A second adjustment bolt 7 passes through the threaded hole. A strip groove 102 is provided on the detection platform 1. The adjustment blocks 6 are installed in the strip groove 102 by the second adjustment bolt 7 and the second fastening nut 8. The support plate is inserted between the two adjustment blocks 6. The upper end of the support plate has an arc-shaped groove that matches the air supply duct 40.

[0034] Preferably, the support plate includes a first support plate 9 and a second support plate 10. The upper end of the first support plate 9 is provided with a first arc-shaped groove 901, and the upper end of the second support plate 10 is provided with a second arc-shaped groove 1001. The curvature of the first arc-shaped groove 901 and the curvature of the second arc-shaped groove 1001 are different.

[0035] The adjustable block is set on the testing platform and its position can be adjusted according to different models of air supply pipes. At the same time, the support plate can be replaced with a matching one according to different models of air supply pipes to adapt to air supply pipes of different diameters. The support plate is designed to be detachable, making it easy to replace and saving changeover time. It is suitable for pressure holding tests of air supply pipes in multiple projects.

[0036] The air spring seat clamping assembly includes a mounting base 11, a first clamping nut 12 and a first clamping bolt 13. The mounting base 11 is mounted on the bracket 2. The end of the mounting base 11 is fitted with a vertical first clamping nut 12. The first clamping nut 12 is threadedly connected to the first clamping bolt 13. The lower end of the first clamping bolt 13 is provided with a first clamping head 14.

[0037] The air supply duct clamping assembly includes a mounting plate 15, a first base 16, an L-shaped support arm 18, a second clamping nut 19, and a second clamping bolt 20. The mounting plate 15 is installed on the side of the testing platform 1. The mounting plate 15 has multiple mounting screw holes 1501 arranged in two rows. The first base 16 is installed on the mounting screw holes 1501 by mounting bolts 17. By opening multiple mounting screw holes on the mounting plate 15, the installation position of the first base 16 can be adjusted to meet the testing requirements of different product models. One end of the L-shaped support arm 18 is installed on the first base 16, and the other end of the L-shaped support arm 18 is installed with a vertical second clamping nut 19. The second clamping nut 19 is threadedly connected to the second clamping bolt 20, and the lower end of the second clamping bolt 20 is provided with a second clamping head 21.

[0038] Preferably, the air supply pipe clamping assembly further includes clamping blocks. The second clamping head 21 clamps the air supply pipe 40 through the clamping blocks. The clamping blocks include a first clamping block 22 and a second clamping block 23. The lower end of the first clamping block 22 is provided with a third arc-shaped groove 2201, and the lower end of the second clamping block 23 is provided with a fourth arc-shaped groove 2301. The curvature of the third arc-shaped groove 2201 and the curvature of the fourth arc-shaped groove 2301 are different. The arrangement of the first clamping block 22 and the second clamping block 23 can adapt to different models of air supply pipes 40, thereby better meeting the testing requirements.

[0039] The air supply duct clamping assembly includes a second base 24, a strip-shaped support arm 25, a clamping nut 27, and a clamping bolt 28. The second base 24 is installed at one end of the testing platform 1. The strip-shaped support arm 25 is installed on the second base 24 in an adjustable manner. Specifically, the strip-shaped support arm 25 has a vertical strip-shaped groove 2501. The strip-shaped support arm 25 is installed on the second base 24 in an adjustable manner through the strip-shaped groove 2501 and the pin 26. The clamping nut 27 is horizontally installed at the upper end of the strip-shaped support arm 25. The clamping bolt 28 is threaded onto the clamping nut 27. The front end of the clamping bolt 28 is provided with a clamping head 29. The clamping head 29 clamps the air supply duct 40 through a pipe plug 30. The pipe plug 30 is connected to the end of the air supply duct 40. The air supply duct clamping assembly is designed with an adjustable height structure to meet the clamping operation of air supply ducts of different heights, thereby ensuring the sealing reliability during the testing process, improving the testing accuracy, and enhancing the overall performance of the device.

[0040] Preferably, the air supply pipe tightening assembly further includes a tightening block 31 for tightening the air supply pipe. Depending on the length of the air supply pipe 40, when the air supply pipe 40 is short, the tightening block 31 is selected to be used. The tightening head 29 tightens the sealing block 30 through the tightening block 31, thereby ensuring the sealing reliability of the air supply pipe 40.

[0041] The air supply assembly includes a mounting base 32, an air supply line 33, and an air supply hose 34. The mounting base 32 is mounted on the bracket 2. The air supply line 33 is hung on the mounting base 32. A pressure gauge 35 and a valve 36 are installed on the air supply line 33. One end of the air supply line 33 is connected to the air supply device, and the other end of the air supply line 33 is connected to one end of the air supply hose 34. The other end of the air supply hose 34 is connected to the air passage inside the sealing block 37.

[0042] Preferably, lifting rings 38 are also provided at the four corners of the upper end of the testing platform 1. The lifting rings 38 facilitate the hoisting of tooling when the process layout is changed.

[0043] This utility model relates to a device for detecting the airtightness of air spring seats in urban rail vehicles. When in use: ... Figure 4As shown, first adjust the positions of the two positioning blocks 3, and press the air spring seat 39 against the positioning blocks 3. Then, adjust the position of the adjusting block 6 according to the size of the air supply pipe 40. Next, select a suitable support plate according to the pipe diameter of the air supply pipe 40 and insert it between the two adjusting blocks 6 to ensure accurate placement. Then, select a suitable pipe plug 30 to seal the end of the air supply pipe 40, adjust the strip support arm 25 to a suitable height, and adjust the tightening bolt 28 to tighten the pipe plug 30 to seal the air supply pipe 40. Select a suitable clamping block according to the pipe diameter of the air supply pipe 40, adjust the second clamping bolt 20, and clamp the air supply pipe 40 with the clamping block. Finally, remove the sealing pressure block 37 from the air supply pipe 40. The upper part of the spring seat 39 is pressed and sealed, and its side is connected to the ventilation hose 34. The first clamping bolt 13 is adjusted to press it from above the sealing block 37 to ensure that the spring seat 39 is reliably sealed. Finally, the testing device is started, and a pressure holding test is carried out on both sets of air supply pipes 40 and the spring seat 39. The air tightness test results are observed through the pressure gauge 35. The sealing block 37 is designed to be pressed from the top, which not only makes it easy to observe whether the block and the product are aligned and improves the alignment time of the sealing block, but also ensures the sealing performance. The sealing block 37 is tightly fitted with the spring seat 39 by the clamping bolt, which can ensure reliable sealing.

[0044] This utility model discloses a device for testing the air tightness of spring seats in urban rail vehicles. The testing platform is equipped with a spring seat positioning component, an air supply pipe support component, a spring seat clamping component, an air supply pipe clamping component, and an air supply pipe tightening component. Through the positioning and clamping cooperation between the components, the testing position of the product can be better defined. The installation and clamping method of this device is flexible and stable, can adapt to spring seats of different specifications, and ensures stability and sealing during the air tightness testing process. The platform can simultaneously meet the pressure holding test of two sets of products, greatly saving the waiting time for pressure holding tests and improving the testing efficiency.

[0045] The above description, in conjunction with preferred technical solutions, provides a further detailed explanation of this utility model. It should not be construed that the specific implementation of the utility model is limited to these descriptions. For those skilled in the art, simple deductions and substitutions can be made without departing from the concept of this utility model, and all such modifications and substitutions should be considered within the scope of protection of this utility model.

Claims

1. A device for detecting the air tightness of the air spring seat of a metro vehicle, characterized in that: The device includes a testing platform equipped with two sets of airtightness testing devices. Each set of airtightness testing devices includes a spring seat positioning assembly, an air supply pipe support assembly, a spring seat clamping assembly, an air supply pipe clamping assembly, an air supply pipe tightening assembly, and an air supply assembly. The spring seat positioning assembly and the air supply pipe support assembly are movably mounted on the testing platform. The air supply pipe clamping assembly is movably mounted on the side of the testing platform. The air supply pipe tightening assembly is mounted at the end of the testing platform. The spring seat clamping assembly and the air supply assembly are respectively mounted on a bracket. The bracket is mounted on the testing platform and positioned close to the spring seat positioning assembly. The spring seat clamping assembly clamps the spring seat through a sealing block connected to the upper end of the spring seat. The sealing block has an air passage communicating with the air supply assembly and the spring seat.

2. The device for detecting the airtightness of the air spring seat in a light rail car according to claim 1, characterized in that: The air spring seat positioning assembly includes positioning blocks, and there are two positioning blocks. Each positioning block has a strip-shaped hole, and a first adjusting bolt passes through the strip-shaped hole. The detection platform has symmetrically opened strip-shaped adjusting holes that are inclined. The positioning blocks are inclinedly installed at the strip-shaped adjusting holes by the first adjusting bolt and the first fastening nut.

3. The device for detecting the airtightness of the air spring seat in a light rail car according to claim 1, characterized in that: The air supply duct support assembly includes two sets of support adjustment components, each set including an adjustment block and a support plate. There are two adjustment blocks, each with a threaded hole. A second adjustment bolt passes through the threaded hole. A strip groove is provided on the detection platform. The adjustment block is installed in the strip groove by the second adjustment bolt and the second fastening nut. The support plate is inserted between the two adjustment blocks. The upper end of the support plate has an arc-shaped groove that matches the air supply duct.

4. The device for detecting the airtightness of the air spring seat in a light rail car according to claim 3, characterized in that: The support plate includes a first support plate and a second support plate. The upper end of the first support plate is provided with a first arc-shaped groove, and the upper end of the second support plate is provided with a second arc-shaped groove. The arc of the first arc-shaped groove and the arc of the second arc-shaped groove are different.

5. The device for detecting the airtightness of the air spring seat in a light rail car according to claim 1, characterized in that: The air spring seat clamping assembly includes a mounting base, a first clamping nut, and a first clamping bolt. The mounting base is mounted on a bracket, and a vertical first clamping nut is installed at the end of the mounting base. The first clamping nut is threadedly connected to the first clamping bolt, and a first clamping head is provided at the lower end of the first clamping bolt.

6. The device for detecting the airtightness of the air spring seat in a light rail car according to claim 1, characterized in that: The air supply pipe clamping assembly includes a mounting plate, a first base, an L-shaped support arm, a second clamping nut, and a second clamping bolt. The mounting plate is installed on the side of the testing platform and has multiple mounting screw holes arranged in two rows. The first base is installed on the mounting screw holes by mounting bolts. One end of the L-shaped support arm is installed on the first base, and the other end of the L-shaped support arm is fitted with a vertical second clamping nut. The second clamping nut is threadedly connected to the second clamping bolt, and the lower end of the second clamping bolt is provided with a second clamping head.

7. The device for detecting the airtightness of the air spring seat in a light rail car according to claim 6, characterized in that: The air supply pipe clamping assembly further includes a clamping block, and the second clamping head clamps the air supply pipe through the clamping block. The clamping block includes a first clamping block and a second clamping block. The lower end of the first clamping block is provided with a third arc-shaped groove, and the lower end of the second clamping block is provided with a fourth arc-shaped groove. The curvature of the third arc-shaped groove and the curvature of the fourth arc-shaped groove are different.

8. The device for detecting the airtightness of the air spring seat in a light rail car according to claim 1, characterized in that: The air supply pipe tightening assembly includes a second base, a strip-shaped support arm, a tightening nut, and a tightening bolt. The second base is installed at one end of the testing platform. The strip-shaped support arm is installed on the second base in an adjustable manner. The tightening nut is horizontally installed at the upper end of the strip-shaped support arm. The tightening bolt is threaded onto the tightening nut. The front end of the tightening bolt is provided with a tightening head. The tightening head tightens the air supply pipe through a pipe plug. The pipe plug is connected to the end of the air supply pipe.

9. The device for detecting the airtightness of the air spring seat in a light rail car according to claim 8, characterized in that: The air supply pipe tightening assembly also includes a tightening block for tightening the air supply pipe.

10. A device for detecting the airtightness of a light spring seat in a light rail car according to any one of claims 1 to 9, characterized in that: The gas supply assembly includes a mounting base, a gas supply line, and a gas supply hose. The mounting base is mounted on a bracket, and the gas supply line is hung on the mounting base. A pressure gauge and a valve are installed on the gas supply line. One end of the gas supply line is connected to the gas supply device, and the other end of the gas supply line is connected to one end of the gas supply hose. The other end of the gas supply hose is connected to the air passage inside the sealing block.

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