Negative pressure airtight testing device for wire harness tube

Abstract

The utility model discloses a negative pressure air tightness testing device for a wire harness tube, the negative pressure air tightness testing device comprises a detection water tank, a swing assembly and a negative pressure assembly, the swing assembly comprises a mounting plate and a main shaft, the mounting plate is arranged at the top end of the detection water tank, and the main shaft is vertically and rotatably arranged on the mounting plate; the bottom end of the main shaft extends into the detection water tank and is in transmission connection with a swing plate, the negative pressure assembly comprises a supporting plate, mounting pipes, a connecting hose and a negative pressure pump, the mounting plate is arranged in the detection water tank, the mounting pipes are arranged on the supporting plate and the swing plate respectively, and the connecting hose is connected with the negative pressure pump. And one connecting hose is arranged on each mounting pipe in a communicating mode, and one negative pressure pump is arranged at the end, away from the corresponding mounting pipe, of each connecting hose in a communicating mode. The device has the effects of simulating the real use condition of the wire harness tube and improving the detection accuracy of the wire harness tube.

Description

Technical Field

[0001] This application relates to the technical field of automotive parts testing, and in particular to a negative pressure airtightness testing device for wire harness tubes. Background Technology

[0002] With the development of the automotive industry, the requirements for vehicle safety and reliability are becoming increasingly stringent. As a crucial component of automobiles, the quality of wiring harnesses directly impacts the stability and lifespan of the entire vehicle's electrical system. Therefore, effectively evaluating the performance of wiring harnesses under complex operating conditions has become an urgent problem to be solved.

[0003] Currently, common testing methods for wire harnesses on the market mainly include single-dimensional inspection methods such as static tensile testing, high-temperature aging testing, and simple bending fatigue testing. While these traditional testing methods can reflect the basic characteristics of wire harnesses to some extent, they still have significant limitations. For example, static tensile testing cannot consider the influence of dynamic torsion; and pressure testing alone cannot accurately reproduce the comprehensive performance under negative pressure conditions. In addition, most existing testing tools are relatively rudimentary in design and cannot meet the needs of modern industrial precision measurement. Overall, existing technologies focus more on verifying single functions and fail to fully consider the various stress superposition situations that may be encountered in actual operating environments.

[0004] Regarding the aforementioned technologies, the inventors believe that traditional one-sided testing cannot accurately reflect the usage conditions of wire harness tubes, especially neglecting the product's durability under the combined effects of negative pressure and torsion. One-sided testing strategies can negatively impact the product's test results. Utility Model Content

[0005] In order to simulate the actual use of wire harness tubes and improve the accuracy of wire harness tube testing, this application provides a negative pressure airtightness testing device for wire harness tubes.

[0006] The negative pressure airtightness testing device for wire harness tubes provided in this application adopts the following technical solution:

[0007] A negative pressure airtightness testing device for wire harness tubes includes a testing water tank, a swing assembly, and a negative pressure assembly. The swing assembly includes a mounting plate and a main shaft. The mounting plate is disposed at the top of the testing water tank. The main shaft is vertically rotatably mounted on the mounting plate, and the bottom end of the main shaft extends into the testing water tank and is connected to the swing plate. The negative pressure assembly includes a support plate, a mounting tube, a connecting hose, and a negative pressure pump. The mounting plate is disposed in the testing water tank. One mounting tube is disposed on both the support plate and the swing plate. One connecting hose is connected to each mounting tube. One negative pressure pump is connected to the end of each connecting hose away from the mounting tube.

[0008] By adopting the above technical solution, during testing, the test tank is filled with liquid, and both ends of the wire harness tube are connected between two mounting pipes. Two negative pressure pumps evacuate the wire harness tube through the mounting pipes. The spindle drives one end of the wire harness tube to reciprocate, simulating the slight twisting of the wire harness tube in a real-world environment. The damage condition of the wire harness tube is monitored by observing changes in the internal air pressure. If the negative pressure can be maintained at a certain value, it proves that the structural strength and durability of the wire harness tube are good under oscillation conditions. Through the cooperation of the test tank, oscillation assembly, and negative pressure assembly, the system effectively simulates the real-world use of the wire harness tube and improves the accuracy of wire harness tube testing.

[0009] Optionally, an installation port is provided on the inner wall of the testing water tank, and the installation pipe provided on the support plate passes through the installation port through the side wall of the testing water tank. The installation plate is detachably connected to the inner wall of the testing water tank.

[0010] By adopting the above technical solution, the installation port enables the detachable connection between the installation plate and the installation pipe installed on the installation plate and the detection water tank. By selecting installation plates with installation pipes of different specifications, the applicability of the device is expanded.

[0011] Optionally, a sealing rubber ring is provided on the outside of the mounting tube disposed on the support plate, and the sealing rubber ring abuts against the inner wall of the mounting port.

[0012] By adopting the above technical solution, the sealing rubber ring improves the tightness of the connection between the installation pipe and the inner ring wall of the installation port, which helps to reduce the possibility of water leakage in the test tank.

[0013] Optionally, the swing assembly further includes a drive pulley, a driven pulley, and a transmission belt. The drive pulley and the driven pulley are rotatably mounted on the mounting plate. The transmission belt is sleeved on the outside of the drive pulley and the driven pulley. The mounting plate is provided with a drive source for driving the drive pulley to rotate. The mounting plate is provided with two proximity switch receivers, which are located on one side of the drive pulley. The peripheral wall of the drive pulley is provided with a proximity switch transmitter. Both the proximity switch transmitter and the proximity switch receiver are electrically connected to the drive source.

[0014] By adopting the above technical solution, the drive source starts and drives the drive pulley and transmission belt to rotate. The driven pulley rotates under the traction of the transmission belt, which in turn drives the main shaft to rotate. When the proximity switch transmitter on the drive pulley rotates to correspond to the position of one of the proximity switch receivers, the drive source drives the drive pulley to reverse, thereby limiting the rotation angle of the main shaft.

[0015] Optionally, the mounting tube is provided with a connecting assembly, which includes a connecting lug, a sliding rod, and a connecting plate. The connecting lug is connected to the outer annular wall of the mounting tube, the sliding rod is slidably connected to the connecting lug, the sliding rod is arranged parallel to the mounting tube, the connecting plate is connected to the end of the sliding rod away from the connecting hose, and an elastic element is provided between the connecting plate and the connecting lug.

[0016] By adopting the above technical solution, the end of the wire harness tube is connected to the mounting tube, and the sliding rod is rotated and pulled, so that one side of the connecting plate is pressed against the edge of the end of the wire harness tube, thus achieving a quick connection of the wire harness tube. The elastic element ensures that the connecting plate remains pressed against the edge of the end of the wire harness tube throughout the connection process.

[0017] Optionally, the bottom surface of the swing plate is provided with a connecting frame, one side of the connecting frame is open, the inner ring wall of the connecting frame is provided with a snap-fit ​​groove, and a plug-in plate is provided above the mounting tube located below the swing frame, the plug-in plate is inserted into the snap-fit ​​groove of the connecting frame.

[0018] By adopting the above technical solution, the connection frame enables a detachable connection between the mounting tube and the spindle. Operators can select different specifications of mounting tubes to install at the bottom of the spindle according to actual needs, thus expanding the applicability of the device.

[0019] Optionally, the top of the detection water tank is provided with a top plate, and the top surface of the top plate is provided with a slide rail. The slide rail is set in a direction parallel to the connection direction of the two mounting pipes. The mounting plate is slidably connected to the slide rail. The top plate is provided with a driving component for driving the mounting plate to move along the length direction of the mounting plate.

[0020] By adopting the above technical solution, for wire harness tubes of different lengths, the relative position between the mounting plate and the top plate can be adjusted by the driving component set on the top plate, thereby realizing the adjustment of the distance between the two mounting tubes and expanding the applicability of the device.

[0021] Optionally, a liquid level sensor is installed in the detection water tank, and the liquid level sensor is installed at the same height as the installation pipe. A water inlet pipe is connected to the bottom of the detection water tank.

[0022] By adopting the above technical solution, the liquid level sensor detects the liquid level in the detection tank. When the liquid level drops to below the installation pipe, water is injected into the detection tank through the water inlet pipe so that the wire harness tube can always be immersed in water.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By detecting the interaction between the water tank, the swing assembly, and the negative pressure assembly, it can simulate the actual use of wire harness tubes and improve the detection accuracy of wire harness tubes;

[0025] 2. The design of the connecting frame and support plate enables a detachable connection between the mounting tube and the main shaft, expanding the applicability of the device;

[0026] 3. By adjusting the relative position between the mounting plate and the top plate for wire harness tubes of different lengths, the distance between the two mounting tubes can be adjusted, thus expanding the applicability of the device. Attached Figure Description

[0027] Figure 1 This is a schematic diagram illustrating the structure of a negative pressure airtightness testing device for wire harness tubes, as described in this application.

[0028] Figure 2 This is a partial cross-sectional view used in the embodiments of this application to illustrate the internal structure of the test tank.

[0029] Figure 3 yes Figure 2 Enlarged view of part A in the middle.

[0030] Figure 4 yes Figure 2 Enlarged view of section B in the middle.

[0031] Explanation of reference numerals in the attached diagram: 1. Test water tank; 101. Observation window; 102. Inlet pipe; 103. Inlet valve; 104. Mounting port; 2. Swing assembly; 21. Top plate; 22. Mounting plate; 23. Drive motor; 24. Drive pulley; 25. Driven pulley; 26. Transmission belt; 27. Proximity switch transmitter; 28. Proximity switch receiver; 29. ​​Adjusting cylinder; 3. Negative pressure assembly; 31. Connecting hose; 32. Negative pressure pump; 33. Installation... 34. Tube; 35. Vacuum gauge; 36. Evacuation ring; 37. Communicating ring groove; 38. Communicating hole; 39. Sealing rubber ring; 40. Support plate; 41. Connecting assembly; 42. Connecting ear plate; 43. Slide rod; 44. Limiting block; 55. Connecting tension spring; 66. Connecting plate; 77. Swing plate; 88. Connecting frame; 99. Snap-fit ​​groove; 10. Insertion plate; 11. Wiring harness tube; 12. Inner tube; 13. Outer tube; 14. Edge; 15. Spindle; 16. Liquid level sensor. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-4 This application will be further described in detail below. Embodiments of this application provide a negative pressure airtightness testing device for wire harness tubes, which simulates the actual use of the wire harness tube 8 and improves the accuracy of testing the wire harness tube 8.

[0033] Reference Figure 1 and Figure 2 A negative pressure airtightness testing device for wire harness tubes includes a testing water tank 1, a swing assembly 2, a negative pressure assembly 3, and a connecting assembly 4. An observation window 101 is provided on one side of the testing water tank 1, and the top of the testing water tank 1 is open. A water inlet pipe 102 is connected to the testing water tank 1, located near the top of the testing water tank 1, and a water inlet valve 103 is provided on the water inlet pipe 102.

[0034] Reference Figure 1 and Figure 2 The swing assembly 2 is mounted on the detection water tank 1. The swing assembly 2 includes a top plate 21, a mounting plate 22, a drive motor 23, a drive pulley 24, a driven pulley 25, a transmission belt 26, a proximity switch transmitter 27, a proximity switch receiver 28, and an adjusting cylinder 29. The top plate 21 is horizontally connected to the top of the detection water tank 1. A slide rail is provided along the length of the top surface of the top plate 21. A groove corresponding to the slide rail is provided on the bottom surface of the mounting plate 22, and the mounting plate 22 is slidably connected to the slide rail through the groove. The adjusting cylinder 29 is mounted on the top surface of the top plate 21. The output shaft of the adjusting cylinder 29 is parallel to the slide rail and is connected to the mounting plate 22 for transmission.

[0035] Reference Figure 1 and Figure 2 Both the drive pulley 24 and the driven pulley 25 are rotatably mounted on the mounting plate 22. A transmission belt 26 is fitted over both the drive pulley 24 and the driven pulley 25. The drive motor 23 is mounted on the mounting plate 22, and its output shaft is connected to the drive pulley 24. The main shaft 9 is vertically rotatably mounted on the mounting plate 22, and its top end is connected to the driven pulley 25. The proximity switch transmitter 27 is connected to the peripheral wall of the drive pulley 24. Two proximity quick-closing receivers are connected to the top surface of the mounting plate 22. Both the proximity switch transmitter 27 and the proximity switch receiver 28 are connected to the drive motor 23.

[0036] Reference Figures 2 to 4 The bottom end of the main shaft 9 is connected to a swing plate 5, and the bottom surface of the swing plate 5 is connected to a connecting frame 6. One end of the connecting frame 6 is open, and a snap-fit ​​groove 61 is formed along the circumferential direction on the inner ring wall of the connecting frame 6. A plug-in plate 7 is inserted into the connecting frame 6. Figure 1The negative pressure assembly 3 includes a connecting hose 31, a negative pressure pump 32, a vacuum gauge 34, an installation pipe 33, a suction ring 35, a sealing rubber ring 36, and a support plate 37. An installation port 104 is provided on one of the vertical side walls of the detection water tank 1. The support plate 37 is bolted to the inner wall of the detection water tank 1 where the installation port 104 is located. An installation pipe 33 is horizontally mounted on the support plate 37, with one end penetrating the support plate 37 and extending out of the detection water tank 1 through the installation port 104. The sealing rubber ring 36 is fitted onto the outer ring wall of the installation port 104, and the sealing rubber ring 36 abuts against the inner wall of the installation port 104. An installation pipe 33 is connected to the bottom end of the plug plate 7. A connecting hose 31 is connected to one end of each of the two installation pipes 33. The end of the connecting hose 31 away from the installation pipe 33 extends out of the detection water tank 1 and is connected to a negative pressure pump 32. The vacuum gauge 34 is connected to one of the connecting hoses 31. The end of the mounting tube 33 away from the connecting hose 31 is closed. The suction ring 35 is connected to the closed end of the mounting tube 33. The end of the suction ring 35 away from the mounting tube 33 is provided with a connecting groove 351 along the circumference. The inner bottom wall of the connecting groove 351 is provided with a connecting hole 352 that communicates with the mounting tube 33.

[0037] Reference Figure 3 The connecting assembly 4 is disposed on the mounting tube 33 and includes a connecting lug 41, a sliding rod 42, a limiting block 43, a connecting tension spring 44, and a connecting plate 45. The connecting lug 41 is disposed on the outer annular wall of the mounting tube 33. The sliding rod 42 passes through the connecting lug 41 and is slidably connected to it. The setting direction of the sliding rod 42 is parallel to the setting direction of the mounting tube 33. The limiting block 43 is connected to the end of the sliding rod 42 near the connecting hose 31, and the connecting plate 45 is perpendicularly connected to the end of the sliding rod 42 away from the connecting hose 31. The connecting tension spring 44 is sleeved on the sliding rod 42, with one end connected to the connecting lug 41 and the other end connected to the connecting plate 45.

[0038] Reference Figure 1 and Figure 3The wire harness tube 8 includes an inner tube 81, an outer tube 82, and edges 83 located at both ends of the outer tube 82. The inner tube 81 is located within the inner cavity of the outer tube 82, with a gap between them. This gap corresponds to the shape of the connecting ring groove 351. During quality inspection of the wire harness tube 8, the end of the wire harness tube 8 is aligned with the vacuum ring 35. The slide rod 42 is rotated and pushed, causing the connecting plate 45 to move to the side of the edge 83 away from the mounting tube 33. The slide rod 42 is then released, and the connecting plate 45 abuts against the edge 83 under the action of the connecting spring, achieving a quick connection between the vacuum ring 35 and the end of the wire harness tube 8. At this time, the connecting ring groove 351 on the vacuum ring 35 is connected to the gap between the outer tube 82 and the inner tube 81. The negative pressure pump 32 is started, and a vacuum operation is performed on the gap between the inner tube 81 and the outer tube 82 through the installation pipe 33 and the connecting hose 31. The vacuum gauge 34 detects the negative pressure inside the wire harness tube 8 in real time.

[0039] Reference Figure 1 and Figure 2 For wire harness tubes 8 of different lengths, the adjusting cylinder 29 drives the mounting plate 22 to move on the top surface of the top plate 21, thereby adjusting the distance between the two mounting tubes 33 and making the device suitable for wire harness tubes 8 of different lengths. The drive motor 23 starts, driving the drive pulley 24 to rotate. The transmission belt 26 and the driven pulley 25 rotate under the drive of the drive pulley 24, thus driving the main shaft 9. When the proximity switch transmitter 27 on the drive pulley 24 corresponds to one of the proximity switch receivers 28, the drive motor 23 rotates in the opposite direction. This reciprocating operation drives the reciprocating rotation of the main shaft 9.

[0040] Reference Figure 1 and Figure 2 The spindle 9 reciprocates under the action of the drive source, simulating real-world usage. The negative pressure value of the vacuum gauge 34 is observed. If the negative pressure value can be maintained within the specified range for a certain period of time, it proves that the wire harness tube 8 is of good quality. The sealing rubber ring 36 seals the gap between the mounting tube 33 and the mounting port 104, reducing the possibility of water leakage from the detection tank 1 through the gap. The level sensor 10 detects the water level in the detection tank 1. When the water level is too low, water is injected into the detection tank 1 through the water inlet pipe 102.

[0041] The implementation principle of the negative pressure airtightness testing device for wire harness tube in this embodiment is as follows: When performing quality inspection on the wire harness tube 8, the end of the wire harness tube 8 is aligned with the vacuum ring 35. The negative pressure pump 32 is started, and a vacuum operation is performed on the gap between the inner tube 81 and the outer tube 82 through the mounting tube 33 and the connecting hose 31. The vacuum gauge 34 detects the negative pressure inside the wire harness tube 8 in real time.

[0042] The drive motor 23 reciprocates, driving the reciprocating rotation of the main shaft 9. By observing the negative pressure value of the vacuum gauge 34, if the negative pressure value can be maintained within the specified range for a certain period of time, it proves that the wire harness tube 8 is of good quality.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A negative pressure airtightness testing device for wire harness tubes, characterized in that: The system includes a detection water tank (1), a swing assembly (2), and a negative pressure assembly (3). The swing assembly (2) includes a mounting plate (22) and a main shaft (9). The mounting plate (22) is located at the top of the detection water tank (1). The main shaft (9) is vertically rotatably mounted on the mounting plate (22). The bottom end of the main shaft (9) extends into the detection water tank (1) and is connected to a swing plate (5). The negative pressure assembly (3) includes a support plate (37), a mounting pipe (33), a connecting hose (31), and a negative pressure pump (32). The mounting plate (22) is located in the detection water tank (1). One mounting pipe (33) is provided on both the support plate (37) and the swing plate (5). One connecting hose (31) is connected to each mounting pipe (33). One negative pressure pump (32) is connected to the end of each connecting hose (31) away from the mounting pipe (33).

2. The negative pressure airtightness testing device for wire harness tubes according to claim 1, characterized in that: An installation port (104) is provided on the inner wall of the detection water tank (1). The installation pipe (33) provided on the support plate (37) passes through the installation port (104) and penetrates the side wall of the detection water tank (1). The installation plate (22) is detachably connected to the inner wall of the detection water tank (1).

3. The negative pressure airtightness testing device for wire harness tubes according to claim 2, characterized in that: A sealing rubber ring (36) is fitted around the outside of the mounting tube (33) located on the support plate (37), and the sealing rubber ring (36) abuts against the inner wall of the mounting port (104).

4. The negative pressure airtightness testing device for wire harness tubes according to claim 1, characterized in that: The swing assembly (2) further includes a drive pulley (24), a driven pulley (25), and a transmission belt (26). The drive pulley (24) and the driven pulley (25) are rotatably mounted on the mounting plate (22). The transmission belt (26) is sleeved on the outside of the drive pulley (24) and the driven pulley (25). The mounting plate (22) is provided with a drive source for driving the drive pulley (24) to rotate. The mounting plate (22) is provided with two proximity switch receivers (28). The two proximity switch receivers (28) are located on one side of the drive pulley (24). The peripheral wall of the drive pulley (24) is provided with a proximity switch transmitter (27). The proximity switch transmitter (27) and the proximity switch receiver (28) are both electrically connected to the drive source.

5. A negative pressure airtightness testing device for wire harness tubes according to claim 4, characterized in that: A connecting assembly (4) is provided on the mounting tube (33). The connecting assembly (4) includes a connecting ear plate (41), a sliding rod (42), and a connecting plate (45). The connecting ear plate (41) is connected to the outer ring wall of the mounting tube (33). The sliding rod (42) is slidably connected to the connecting ear plate (41). The sliding rod (42) is arranged parallel to the mounting tube (33). The connecting plate (45) is connected to the end of the sliding rod (42) away from the connecting hose (31). An elastic element is provided between the connecting plate (45) and the connecting ear plate (41).

6. The negative pressure airtightness testing device for wire harness tubes according to claim 1, characterized in that: The bottom surface of the swing plate (5) is provided with a connecting frame (6), one side of the connecting frame (6) is open, and a snap-fit ​​groove (61) is provided on the inner ring wall of the connecting frame (6). A plug-in plate (7) is provided above the mounting tube (33) located below the swing plate (5), and the plug-in plate (7) is inserted into the snap-fit ​​groove (61) of the connecting frame (6).

7. The negative pressure airtightness testing device for wire harness tubes according to claim 1, characterized in that: The top of the detection water tank (1) is provided with a top plate (21), and a slide rail is provided on the top surface of the top plate (21). The slide rail is set in a direction parallel to the connection direction of the two mounting pipes (33). The mounting plate (22) is slidably connected to the slide rail. The top plate (21) is provided with a driving component for driving the mounting plate (22) to move along the length direction of the mounting plate (22).

8. The negative pressure airtightness testing device for wire harness tubes according to claim 1, characterized in that: The detection water tank (1) is equipped with a liquid level sensor (10), the liquid level sensor (10) is installed at the same height as the installation pipe (33), and the bottom of the detection water tank (1) is connected to a water inlet pipe (102).

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