Air tightness detection device for air spring

Abstract

The utility model relates to an air spring air tightness detection device which comprises an airtight box, the top of the airtight box is provided with an air pipe and a helium detector, one end of the air pipe is connected with an air port of an air spring through a screwed joint, the other end of the air pipe is connected with a helium tank through a gas tank valve, the air pipe is provided with a barometer, and the helium detector is connected with the helium tank. The helium detector is used for monitoring the concentration of helium in the airtight box, a positioning socket is arranged at the bottom of the airtight box, the positioning socket is in threaded connection with the bottom of the air spring, and a sealing door plate is arranged on one side of the airtight box. According to the utility model, the air spring is arranged in the airtight box, the air tightness of the air spring is detected by accurately monitoring the air pressure in the air spring and the helium concentration change in the airtight box in a closed environment, and the detection efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of fluid tightness detection of air springs, and particularly relates to an air spring air tightness detection device. Background Art

[0002] Air springs are used for vibration reduction of rail transit vehicles, and air tightness detection of air springs is an important task. Chinese Patent Application No. 202311716826.3 discloses an air spring water detection machine, which includes an upper frame, a lower frame and a control machine. A glass water tank is arranged inside the lower frame, and a lifting oil cylinder for driving the upper frame to move is arranged outside the glass water tank. A lifting platform plate is arranged on the upper frame, and a clamping device is installed on the lifting platform plate. The clamping device includes an upper airbag tooling and a lower airbag tooling for fixing the air spring. During the detection process, the air spring can be repeatedly pressed through a clamping oil cylinder to simulate the compression of the air spring, and the air spring can be driven to rotate through a reduction gear to simulate the torsion of the air spring, so that the detection result is more in line with the actual scenario and the detection result is more accurate. However, after underwater detection, the air spring needs to be dried again, and the detection process is complex and inconvenient, and the detection efficiency is not high. Summary of the Utility Model

[0003] In order to simplify the detection process of air spring air tightness and improve the detection efficiency, the utility model provides an air spring air tightness detection device, which places the air spring in an airtight box and detects the air tightness of the air spring by accurately monitoring the change of air pressure in the air spring and the helium concentration in the airtight box in a closed environment, so as to improve the detection efficiency.

[0004] The purpose of the utility model is realized through the following technical solutions: an air spring air tightness detection device includes an airtight box. A trachea and a helium detector are arranged on the top of the airtight box. One end of the trachea is connected to the air port of the air spring through a threaded joint, and the other end of the trachea is connected to a helium gas cylinder through a gas tank valve. A pressure gauge is arranged on the trachea. The helium detector is used to monitor the helium concentration in the airtight box. A positioning socket is arranged at the bottom of the airtight box, and the positioning socket is threadedly connected to the bottom of the air spring. A sealing door panel is arranged on one side of the airtight box.

[0005] In a preferred embodiment, the positioning socket is provided with a threaded pipe seat, a rubber gasket is arranged in the middle of the threaded pipe seat, a positioning hole is arranged at the bottom of the airtight box, the lower part of the threaded pipe seat is threadedly connected to the positioning hole, and the upper part of the threaded pipe seat is threadedly connected to the bottom of the air spring.

[0006] In a preferred embodiment, the top of the sealing door panel is connected to the airtight box through a hinge, and the side part of the sealing door panel is fixed to the airtight box through a buckle.

[0007] In a preferred embodiment, an air pipe through-hole and a helium detector mounting hole are provided at the top of the airtight box.

[0008] In a preferred embodiment, a display screen and an audible and visual alarm are provided on the helium detector.

[0009] In a preferred embodiment, the helium gas cylinder is fixed on a gas cylinder trolley, and the gas cylinder trolley is provided with an anti-tipping chain and universal wheels.

[0010] The utility model has the following advantages compared with the prior art:

[0011] The detection sensitivity of the utility model is extremely high, and the helium detector can very accurately detect tiny helium leaks. Since helium has a small molecular weight, it is easier to penetrate tiny pores, so even very small leaks can be accurately detected. And the non-destructive characteristic of helium detection enables the entire detection process to not require any form of damage or modification to the air spring under test. It can protect the appearance and structure of the product, and also avoid performance degradation or damage caused by detection, thereby extending the service life of the product. From the aspects of operation simplicity and safety, compared with the traditional method, the detection process is more simplified and the operation is more convenient. At the same time, the non-toxic and harmless property of helium also ensures the safety of the detection process and avoids potential safety hazards caused by the use of harmful substances. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of the utility model;

[0013] Figure 2 is a schematic structural diagram of the positioning socket in the utility model;

[0014] Figure 3 is a schematic structural diagram of the airtight box in the utility model;

[0015] Figure 4 is another schematic structural diagram of the utility model;

[0016] Reference numerals: 1 - airtight box; 2 - air pipe; 3 - helium detector; 4 - threaded joint; 5 - gas cylinder valve; 6 - helium gas cylinder; 7 - pressure gauge; 8 - positioning socket; 9 - sealing door panel; 10 - threaded pipe seat; 11 - rubber gasket; 12 - positioning hole; 13 - hinge; 14 - buckle; 15 - air pipe through-hole; 16 - helium detector mounting hole; 17 - display screen; 18 - audible and visual alarm; 19 - gas cylinder trolley; 20 - air spring; 21 - threaded hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The following further describes in detail the implementation mode of the present utility model in conjunction with the accompanying drawings and embodiments. The detailed descriptions and drawings of the following embodiments are used to exemplarily illustrate the principle of the present utility model, but cannot be used to limit the scope of the present utility model, that is, the present utility model is not limited to the described preferred embodiments, and the scope of the present utility model is defined by the claims.

[0018] In the description of the present utility model, it should be noted that unless otherwise stated, the meaning of "a plurality" is two or more; the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0019] Embodiment 1

[0020] See Figure 1 、 Figure 4 As shown in

[0021] See Figure 2 、 Figure 3 In this embodiment, an air spring airtightness detection device provided includes an airtight box 1. A trachea 2 and a helium detector 3 are provided at the top of the airtight box 1. One end of the trachea 2 is connected to the air port of the air spring through a threaded joint 4, and the other end of the trachea 2 is connected to a helium gas cylinder 6 through a gas cylinder valve 5. A pressure gauge 7 is provided on the trachea 2. The helium detector 3 is used to monitor the helium concentration in the airtight box 1. A positioning socket 8 is provided at the bottom of the airtight box 1. The positioning socket 8 is threadedly connected to the bottom of the air spring 20. A sealing door panel 9 is provided on one side of the airtight box 1.

[0022] See Figure 3 In this embodiment, the positioning socket 8 is provided with a threaded pipe seat 10. A rubber gasket 11 is provided in the middle of the threaded pipe seat 10. External threads are provided on both the upper and lower parts of the threaded pipe seat 10. A positioning hole 12 is provided at the bottom of the airtight box 1. The positioning hole 12 is a blind hole and is provided with internal threads on the surface. The lower part of the threaded pipe seat 10 is threadedly connected to the positioning hole 12, and the upper part of the threaded pipe seat 10 is threadedly connected to the threaded hole 21 at the bottom of the air spring.

[0023] See Figure 3, the airtight box 1 is used to ensure the detection of the change in helium concentration under airtight conditions. A customized acrylic airtight box can be selected, which can effectively isolate the potential interference of the external environment on the detection. The high transparency of the acrylic material greatly improves the intuitiveness of the detection and enables clear observation of the detection process. The acrylic airtight box has the advantages of easy processing and easy cleaning, can flexibly adapt to different detection requirements, and can be customized to meet the experimental requirements. The top of the airtight box 1 is provided with an air pipe through hole 15 and a helium detector installation hole 16. The air pipe 2 uses an inflatable hose, and the air pipe passes through the airtight box from the air pipe through hole.

[0024] In this embodiment, the helium detector is used to detect whether there is helium leakage. The SGA-500 of Shenguoa can be selected, which has the advantages of high precision, high stability and long service life. The helium detector 3 is provided with a display screen 17 and an audible and visual alarm 18. The display screen intuitively displays the helium concentration. The alarm point, zero point and target point can be adjusted without opening the cover through the remote control, and the upper and lower limit alarms can be set within the full range.

[0025] In this embodiment, the pressure gauge is used to judge whether the pressure in the air spring reaches the standard. The Hongqi remote transmission pressure gauge XTZ-150, the Leierda YNTZ150 shock-resistant remote transmission pressure gauge, etc. can be selected. The remote transmission pressure gauge not only has excellent measurement characteristics such as high resolution, high precision and wide temperature range, but also can remotely transmit the measurement result to the control system or display instrument through an electric signal. It is suitable for occasions that require remote monitoring or automatic control. Through seamless electric signal transmission, the remote transmission pressure gauge can easily be integrated with other devices or systems to realize real-time sharing and processing of data.

[0026] See Figure 1 , Figure 4 , the helium gas cylinder 6 is fixed on the gas cylinder trolley 19. The gas cylinder trolley is used to ensure the stability and safety of the helium gas cylinder during transportation. The XYZ-120 type gas cylinder trolley can be selected, which is made of high-strength steel and has a strong load-bearing capacity. The gas cylinder trolley 19 is equipped with an anti-tipping chain and universal wheels, which is easy to operate, reduces the burden on the staff and improves work efficiency.

[0027] The selected helium detector is equipped with an upper limit alarm function. Given that the concentration of helium in the atmosphere is approximately 5.2 ppm, the alarm upper limit is set to 10 ppm to prevent the influence of errors that may be caused by human operation. Next, open the sealing buckle of the sealed box, fasten the positioning socket in the exact center of the airtight box, and place a rubber gasket. Then, screw and fix the central threaded hole of the lower bottom plate of the air spring to be tested with the positioning socket (ensure that the diameter of the air spring to be tested is smaller than that of the airtight box, so that there is a certain distance between the air spring and the four sides of the airtight box). After connecting the air spring and the inflation hose through a threaded joint, close the airtight box and fasten the sealing buckle. Turn on the helium detector and monitor its status. At this time, the green indicator light of the audible and visual alarm should be lit, and the liquid crystal display screen on the helium detector should display the current helium concentration in real time. Then open the gas cylinder valve on the helium gas cylinder and observe the reading of the pressure gauge. When the air pressure in the air spring reaches the airtightness test standard of 0.6 MPa, stop inflating and close the gas cylinder valve. If there is a slight change in the helium concentration in the airtight box and it exceeds the set 10 ppm alarm upper limit of the helium detector, the red indicator light of the audible and visual alarm will be lit, indicating that the air spring may be damaged and reminding the operator to pay attention.

[0028] If the helium concentration does not change within the subsequent 5 minutes, a pressure holding test is carried out. At this stage, it is necessary to manually record the pressure drop value of the pressure gauge within the next 30 minutes. If the air pressure drop in the air spring does not exceed 10 KPa and the helium detector shows no change, it means that the airtightness test passes. On the contrary, if the pressure drop exceeds this value or the helium detector shows a change, it indicates that the airtightness test fails. The selected pressure gauge and helium detector are both equipped with a data transmission function. To improve the test efficiency and accuracy, a main control box can be further added as a data collection and processing center. The data of the pressure gauge and the helium detector can be detected and automatically recorded in real time, making the test process more automated and intelligent.

[0029] As described above, it is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. An air spring air tightness detection device, characterized in that: The invention comprises an airtight box (1), wherein an air pipe (2) and a helium detector (3) are arranged on the top of the airtight box (1), one end of the air pipe (2) is connected to the air port of an air spring via a threaded joint (4), and the other end of the air pipe (2) is connected to a helium tank (6) via a tank valve (5), a pressure gauge (7) is arranged on the air pipe (2), and the helium detector (3) is used to monitor the helium concentration in the airtight box (1), a positioning socket (8) is arranged at the bottom of the airtight box (1), and the positioning socket (8) is threadedly connected to the bottom of the air spring, and a sealing door panel (9) is arranged on one side of the airtight box (1).

2. The air spring air tightness detection device according to claim 1, characterized in that: The positioning socket (8) is provided with a threaded tube seat (10), a rubber gasket (11) is provided in the middle of the threaded tube seat (10), a positioning hole (12) is provided at the bottom of the airtight box (1), the lower part of the threaded tube seat (10) is threadedly connected to the positioning hole (12), and the upper part of the threaded tube seat (10) is threadedly connected to the bottom of the air spring.

3. An air spring air tightness detection device according to claim 1 or 2, characterized in that: The top of the sealing door panel (9) is connected to the airtight box (1) via a hinge (13), and the side of the sealing door panel (9) is fixed to the airtight box (1) via a buckle (14).

4. The air spring air tightness detection device according to claim 1, characterized in that: The top of the airtight box (1) is provided with an air pipe through hole (15) and a helium detector installation hole (16).

5. The air spring air tightness detection device according to claim 1, characterized in that: The helium detector (3) is provided with a display screen (17) and an audible and visual alarm (18).

6. The air spring air tightness detection device according to claim 1, characterized in that: The helium gas tank (6) is fixed on a gas tank trolley (19), and the gas tank trolley (19) is provided with an anti-dumping chain and a universal wheel.

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