A water pressure penetration testing device and method for automotive sealing strips

Abstract

This invention relates to the field of automotive sealing strips, specifically disclosing a water pressure penetration testing device and method for automotive sealing strips. The device includes a water inlet terminal, a test box, and a water outlet terminal connected in sequence, and a pressurizing component connected to the water inlet terminal; an observation window disposed on the test box, facing the sealing strip; and several mounting blocks, detachably installed inside the test box and facing the observation window. The sealing strip to be tested is detachably installed between the mounting blocks and the observation window. The thickness of the mounting blocks is different, or the thickness of the mounting blocks can be varied. This solution allows for the selection of mounting blocks of appropriate thickness based on the pressure between the sealing surface of the sealing strip and the observation window, or by changing the thickness of the mounting blocks during the testing process to control the pressure between the sealing surface of the sealing strip and the observation window, thereby simulating different sealing pressures and sealing reaction forces between the sealing strip and the contact component during actual installation.

Description

Technical Field

[0001] This invention relates to the field of automotive sealing strip technology, and in particular to a water pressure penetration testing device and method for automotive sealing strips. Background Technology

[0002] Automotive weatherstripping is a key functional component in the vehicle body structure, widely used in areas such as car doors and tailgates. Rigorous sealing performance testing of automotive weatherstripping is essential to ensure its core functionality and improve the overall quality and reliability of the vehicle. Currently, common sealing performance tests for automotive weatherstripping involve measuring the leakage rate under a fixed volume of water to determine if it falls within acceptable limits.

[0003] However, since automotive sealing strips are mostly made of rubber, after the sealing strip blocks external liquids or gases, the contact surface between the sealing strip and the contact component is also subjected to the pressure of the liquid or gas. When the pressure of the liquid or gas at this point increases to a limit, it will cause local sealing failure of the sealing strip. This phenomenon is called contact surface pressure penetration. However, the current common automotive sealing strip sealing performance test is to obtain sealing performance test data by changing the water pressure, which makes it difficult to perform water pressure penetration test on the sealing strip under specific compression conditions. As a result, it is difficult to accurately obtain water pressure penetration data of automotive sealing strips, leading to slow updates in sealing strip design. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a water pressure penetration testing device and method for automotive sealing strips. This solves the problem that current commonly used automotive sealing strip sealing performance testing methods, when the pressure at the sealing surface of the sealing strip is constant, can only detect when the pressure of liquid or gas increases to its limit to determine whether the sealing force of the sealing surface is within the allowable standard, making it difficult to perform water pressure penetration testing.

[0005] To achieve the above objectives, the basic solution of the present invention is as follows: A water pressure penetration testing device for automotive sealing strips, comprising an inlet terminal, a test box, and an outlet terminal connected in sequence, and further comprising:

[0006] A pressurization assembly connected to the water inlet terminal;

[0007] An observation window is located on the experimental box, directly opposite the sealing strip.

[0008] Several mounting pads are detachably installed inside the experimental box and directly opposite the observation window. The sealing strip to be tested is detachably installed between the mounting pads and the observation window. The thickness of the mounting pads is different, or the thickness of the mounting pads can vary.

[0009] The technical principle of this invention is as follows: When performing water pressure penetration testing on the sealing strip to be tested, the sealing strip to be tested is installed on the mounting pad. At this time, the mounting pad of appropriate thickness can be selected according to the pressure between the sealing surface of the sealing strip to be tested and the observation window. Alternatively, the thickness of the mounting pad can be changed during the testing process to control the pressure between the sealing surface of the sealing strip to be tested and the observation window, making the testing state of the sealing strip to be tested more diverse. This allows for the simulation of different sealing pressures and sealing reaction forces between the sealing strip and the hand component during actual installation, making it easier to obtain the water pressure penetration resistance performance of the sealing surface of the sealing strip to be tested under different sealing reaction forces.

[0010] During the testing process, the observation window allows for easy viewing of the installation status of the sealing strip under test and the condition of the sealing surface, as well as easy monitoring of its status during testing, facilitating precise control of the testing process.

[0011] Furthermore, the pressurization component includes:

[0012] Water inlet pipe, which is connected to the water inlet terminal;

[0013] A booster pump, connected to the inlet pipe;

[0014] A pressure gauge for measuring water pressure data inside the inlet pipe.

[0015] With the above settings, the pressure pump can quickly and accurately adjust the water pressure at the inlet terminal and the end of the test box; at the same time, the pressure gauge can measure and obtain the pressure in real time, thereby obtaining the limit water pressure of the sealing strip under test when leakage occurs, forming corresponding data records, which can provide data guidance for the design of the sealing strip under test.

[0016] Furthermore, it also includes:

[0017] Water outlet pipe, which is connected to the water outlet terminal;

[0018] The water tank is connected to the outlet pipe, inlet pipe, and booster pump.

[0019] With the above setup, the water outlet pipe, water tank, and water inlet pipe can cooperate with the water inlet terminal, test box, and water outlet terminal to form a water flow loop, which facilitates the conduction of circulating water pressure penetration tests and allows for multiple and continuous testing of different groups of sealing strips to be tested.

[0020] Furthermore, it also includes a pressure sensor that measures the pressure between the sealing strip to be tested and the observation window, with the pressure sensor mounted on the observation window.

[0021] The above settings facilitate obtaining the pressure at the sealing surface of the sealing strip under test through the pressure sensor, facilitate adjusting the sealing pressure by installing a pad, facilitate further understanding the correlation between the pressure at the sealing surface of the sealing strip under test and the water pressure, and make it easier to obtain the water pressure penetration resistance of the sealing surface of the sealing strip under test under different sealing reaction forces.

[0022] Furthermore, the mounting pad has a groove for mounting the sealing strip to be tested, and the axis of the groove is perpendicular to the line connecting the inlet terminal and the outlet terminal.

[0023] The above settings facilitate the stable installation of the sealing strip to be tested into the groove of the mounting pad, and ensure that the end of the sealing strip to be tested abuts against the side wall of the test box, thereby achieving stable testing of the sealing strip to be tested.

[0024] Furthermore, it also includes a measurement and observation component, which includes:

[0025] Several capillary tubes are installed side by side on the side of the observation window near the mounting pad. The ends of the capillary tubes can contact or abut against the side of the sealing strip to be tested away from the water inlet terminal.

[0026] The water tank contains water that contains coloring or fluorescent agents.

[0027] With the above setup, the capillary can draw and guide water as soon as a slight leak occurs in the sealing strip under test. At this time, it is convenient to quickly and accurately determine the timing of the leak by using water containing color or fluorescent agent in the capillary, thereby accurately obtaining the pressure gauge data and improving the accuracy of the data. At the same time, water containing color or fluorescent agent makes the judgment of the leak of the sealing strip under test more visible, faster and more accurate.

[0028] Furthermore, the measurement and observation components also include:

[0029] Several absorbent papers are detachably installed on the side of the observation window near the mounting pad, with the edge of the absorbent paper abutting against the end of several capillary tubes away from the sealing strip to be tested.

[0030] With the above setup, the capillary can guide the leaked water to the absorbent paper. If the absorbent paper is found to absorb a lot of water in a local area, it indicates that there may be a risk of leakage in a local area of ​​the sealing strip under test. This risk may be caused by design structure, local defects, etc., and can be easily improved. If the absorbent paper is found to be completely soaked, it indicates that the sealing surface of the sealing strip under test has completely failed. The sealing surface structure of the sealing strip under test can be further improved to achieve waterproof pressure penetration performance.

[0031] Furthermore, the mounting pad includes:

[0032] The mounting plate has a first threaded hole on its lower surface and a second threaded hole that coincides with the first threaded hole at the bottom of the experimental box. Fixing screws can be detachably installed at the first threaded hole and the second threaded hole.

[0033] The support plate has its lower surface directly opposite the upper surface of the mounting plate, and the side walls of both the mounting plate and the support plate away from the observation window abut against the side wall of the experimental box. The groove is located on the upper surface of the support plate.

[0034] The elastic airbag is fixedly installed between the mounting plate and the support plate, with the side wall of the airbag abutting against the side wall of the experimental box.

[0035] An inflation tube passes through the end of the experimental box near the water outlet terminal and is connected to the air bladder.

[0036] An air pump connected to an inflation tube.

[0037] With the above settings, when adjusting the pressure at the sealing surface of the sealing strip under test, the air pump is controlled to inflate or draw air into the airbag. When the pressure value obtained by the pressure sensor reaches the pressure value required for detection at the sealing surface of the sealing strip under test, the air pump stops inflating or drawing air. This allows for quick and accurate adjustment of the pressure at the sealing surface of the sealing strip under test, facilitating repeated testing of the sealing strip under test and improving testing efficiency and accuracy.

[0038] Furthermore, a lamp post is horizontally installed inside the observation window, with the lamp post opposite a number of capillary tubes.

[0039] With the above settings, the light column can quickly develop the color of water containing fluorescent agents, making it easier to visually distinguish after water is introduced into the capillary, thus improving the accuracy and efficiency of judgment during testing.

[0040] The present invention also aims to provide a method for testing the water pressure penetration of automotive sealing strips, including a water pressure penetration testing device for automotive sealing strips, and further including the following steps:

[0041] Select the appropriate mounting pad according to the thickness of the sealing strip to be tested, remove the observation window on the test box, and install the mounting pad into the test box; install the sealing strip to be tested onto the mounting pad, install the observation window onto the test box, and fit the sealing strip to be tested against the observation window;

[0042] Connect the water inlet terminal, water outlet terminal, water inlet pipe, water outlet pipe, and water tank of the experimental box;

[0043] Fill the water tank with water until the liquid level is above the inlet of the tank;

[0044] The air pump is controlled to inflate or draw air from the airbag. When the pressure value N1 obtained by the pressure sensor reaches the pressure value required for detection at the sealing surface of the sealing strip to be tested, the air pump stops inflating or drawing air.

[0045] Start the pressure pump to vent air from the water inlet pipe and water inlet terminal, and let water enter the water inlet pipe, water inlet terminal and the end of the experimental box near the water inlet terminal;

[0046] The pressure pump continuously pressurizes the capillary tube and absorbent paper through the observation window. When the capillary tube shows color or fluorescence, leakage occurs on the sealing surface of the sealing strip under test. Record the pressure value N2 on the pressure gauge at this time. 3-10 seconds after leakage occurs, turn off the pressure pump and record the water absorption traces on the absorbent paper through the capillary tube.

[0047] Remove the sealing strip to be tested, clean the capillary tube on the observation window, and replace the absorbent paper.

[0048] The technical principle of this invention is as follows: By controlling the pressurization pump, air at the water inlet terminal and the right end of the test box can be expelled, allowing water to enter the right end of the test box for testing, thus reducing the influence of air on the test results. At the same time, by combining the pressure value N1 and the pressure value N2, the sealing surface of the sealing strip under the maximum water pressure during daily vehicle use can reach the corresponding pressure value N1, thereby achieving waterproofing and leakage. This ensures the performance of the sealing strip while meeting the minimum design requirements, improving the economy of the sealing strip and reducing design costs. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the axial direction of a water pressure penetration testing device for an automotive sealing strip according to an embodiment of the present invention.

[0050] Figure 2 for Figure 1 Enlarged view of the inlet terminal, experimental box, and outlet terminal.

[0051] Figure 3 for Figure 2 A longitudinal sectional view of the experimental kit.

[0052] In the above-mentioned attached figures: experimental box 10, second threaded hole 101, water inlet terminal 201, water outlet terminal 202, water inlet pipe 203, water outlet pipe 204, water tank 205, pressurizing pump 30, pressure gauge 301, observation window 40, lamp post 401, mounting pad 402, mounting plate 412, first threaded hole 422, support plate 432, groove 442, airbag 452, inflation tube 50, capillary tube 601, absorbent paper 602, pressure sensor 70. Detailed Implementation

[0053] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0054] This embodiment is basically as follows: Figure 1, Figure 2 and Figure 3 As shown in the figure, this embodiment of the invention proposes a water pressure penetration testing device for automotive sealing strips, including an inlet terminal 201, a test box 10, and an outlet terminal 202 connected in sequence, a pressurizing component connected to the inlet terminal 201, an observation window 40, several mounting pads 402, a measuring and observation component, and a pressure sensor 70 for measuring the pressure between the sealing strip to be tested and the observation window 40. The lower surface of the pressure sensor 70 is coplanar with the lower surface of the observation window 40, wherein the observation window 40 is a glass cover plate, and the observation window 40 is detachably fixed to the middle of the upper surface of the test box 10 by screws. The pressure sensor 70 is disposed on the observation window 40, and the observation window 40 is directly opposite the sealing strip. Several mounting pads 402 are detachably installed inside the test box 10 and are directly opposite the observation window 40. The sealing strip to be tested is detachably installed between the mounting pads 402 and the observation window 40.

[0055] Among them, such as Figure 1 and 3 As shown, the mounting pad 402 includes a mounting plate 412, a support plate 432, an elastic airbag 452, an inflation tube 50, and an air pump connected to the inflation tube 50. A first threaded hole 422 is provided on the lower surface of the mounting plate 412, and a second threaded hole 101 coinciding with the first threaded hole 422 is provided at the bottom of the experimental box 10. Fixing screws are detachably installed at the first threaded hole 422 and the second threaded hole 101. The lower surface of the support plate 432 is directly opposite the upper surface of the mounting plate 412, and the side walls of the mounting plate 412 and the support plate 432 away from the observation window 40 are both flush with the experimental box. The side walls of the box 10 abut against each other. The upper surface of the support plate 432 is provided with a groove 442 for the installation of the sealing strip to be tested. The axis of the groove 442 is perpendicular to the line connecting the water inlet terminal 201 and the water outlet terminal 202. The air bladder 452 is made of hard rubber. The air bladder 452 is coplanar with the side walls of the mounting plate 412 and the support plate 432 and abuts against the inner wall of the test box 10. The thickness of the air bladder 452 is 0.5-1cm. The air bladder 452 is fixedly installed between the mounting plate 412 and the support plate 432. The inflation tube 50 passes through the left end of the test box 10 and communicates with the air bladder 452.

[0056] like Figure 1 As shown, the pressurization assembly includes an inlet pipe 203, an outlet pipe 204, a water tank 205, a pressurization pump 30, and a pressure gauge 301 for detecting the water pressure data in the inlet pipe 203. The inlet pipe 203 is connected to the inlet terminal 201, the pressurization pump 30 is connected to the inlet pipe 203, the outlet pipe 204 is connected to the outlet terminal 202, and the water tank 205 is connected to the outlet pipe 204, the inlet pipe 203, and the pressurization pump 30. The pressurization pump 30 and the pressure gauge 301 are both fixedly installed on the water tank 205, and the water tank 205 contains water containing fluorescent agents.

[0057] like Figure 1 and Figure 3 As shown, the measurement and observation assembly includes several capillary tubes 601 and several absorbent papers 602. The capillary tubes 601 are installed side by side on the side of the observation window 40 near the mounting pad 402. The ends of the capillary tubes 601 can contact or abut against the side of the sealing strip to be tested away from the water inlet terminal 201. The absorbent papers 602 are detachably installed on the side of the observation window 40 near the mounting pad 402. The edges of the absorbent papers 602 abut against the ends of the capillary tubes 601 away from the sealing strip to be tested.

[0058] In addition, a lamp post 401 is horizontally installed inside the observation window 40, and the lamp post 401 is opposite to a number of capillary tubes 601. The lamp post 401 emits ultraviolet light.

[0059] When testing automotive sealing strips using a water pressure penetration testing device, a water pressure penetration testing method for automotive sealing strips is employed, specifically including the following steps:

[0060] This embodiment prepares a water pressure penetration testing device for an automotive sealing strip and a sealing strip to be tested, wherein the sealing strip to be tested is a door strip or door frame strip of an automotive door.

[0061] Select the appropriate mounting pad 402 according to the thickness of the sealing strip to be tested, remove the observation window 40 on the test box 10, install the mounting pad 402 into the test box 10; adhere the sealing strip to be tested to the mounting pad 402, install the observation window 40 into the test box 10, and attach the sealing strip to be tested to the observation window 40.

[0062] Connect the water inlet terminal 201, water outlet terminal 202, water inlet pipe 203, water outlet pipe 204 and water tank 205 of the experimental box 10;

[0063] Add water containing fluorescent agent to water tank 205 until the liquid level exceeds the inlet of water tank 205;

[0064] The air pump is controlled to inflate or inhale the airbag 452. When the pressure value N1 obtained by the pressure sensor 70 reaches the pressure value required for detection at the sealing surface of the sealing strip to be tested, the air pump stops inflating or inhaling.

[0065] Start the pressure pump 30 to vent the water inlet pipe 203 and water inlet terminal 201, and water enters the water inlet pipe 203, water inlet terminal 201 and the end of the experimental box 10 near the water inlet terminal 201;

[0066] The pressurizing pump 30 continuously pressurizes the system, and the lamp post 401 is turned on. The capillary tube 601 and the absorbent paper 602 are observed through the observation window 40. When the capillary tube 601 shows color or fluorescence, leakage occurs on the sealing surface of the sealing strip under test. The pressure value N2 of the pressure gauge 301 is recorded at this time. 4-5 seconds after the leakage occurs, the pressurizing pump 30 is turned off, and the water absorption trace at the absorbent paper 602 through the capillary tube 601 is recorded.

[0067] Disassemble the observation window 40, clean the capillary tube 601 on the observation window 40, and replace the absorbent paper 602;

[0068] Repeat the installation steps of the observation window 40, and control the air pump to inflate or inhale the air bag 452 again. When the pressure value N3 obtained by the pressure sensor 70 reaches another pressure value required for detection at the sealing surface of the sealing strip under test, the air pump stops inflating or inhaling. Repeat the control of the pressurization pump 30 to vent the water inlet pipe 203 and the water inlet terminal 201. The pressurization pump 30 continues to pressurize again. When leakage occurs at the sealing surface of the sealing strip under test, record the pressure value N4 of the pressure gauge 301 and the corresponding water absorption mark on the absorbent paper 602. Clean the capillary tube 601 on the observation window 40 and replace the absorbent paper 602. Repeat this step Y times to obtain the pressure values ​​N1, N3...N obtained by the pressure sensor 70. 2Y-1 Obtain the pressure values ​​N2, N4, ... N from pressure gauge 301. 2Y ;

[0069] Remove the observation window 40, remove the sealing strip to be tested, clean the capillary tube 601 on the observation window 40, and replace the absorbent paper 602.

[0070] In this embodiment, when using a water pressure penetration testing device for automotive sealing strips to perform water pressure penetration testing, the mounting pad 402 and the test box 10 can provide a stable installation and testing space for the sealing strip under test, and the support plate 432 and the groove 442 can provide stable limiting installation for the sealing strip under test; at the same time, it is convenient to observe the installation status of the sealing strip under test and the status of the sealing surface through the observation window 40, and it is also convenient to check the status during the test, so as to accurately control the test process.

[0071] During testing, the inlet terminal 201, test box 10, outlet terminal 202, inlet pipe 203, outlet pipe 204 and water tank 205 form a water flow loop, which facilitates the cyclic water pressure penetration test and allows for multiple and continuous testing of different groups of sealing strips to be tested.

[0072] After the sealing strip to be tested is installed between the observation window 40 and the support plate 432, the airbag 452 is inflated or inhaled through the air pump and the inflation tube 50, so that the pressure sensor 70 obtains pressure values ​​N1, N3...N 2Y-1 This allows for precise control of the pressure between the sealing strip under test and the observation window 40, thereby simulating different sealing pressures and sealing reaction forces between the sealing strip and the counterparts during actual installation. It also makes it easier to obtain the water pressure penetration resistance of the sealing surface of the sealing strip under test under different sealing reaction forces.

[0073] During testing, by controlling the pressure pump 30, air at the water inlet terminal 201 and the right end of the test box 10 can be expelled, allowing water to enter the right end of the test box 10 for testing, thus reducing the influence of air on the test results. As the pressure pump 30 continues to pressurize, the water pressure at the right end of the test box 10 and at the sealing surface of the sealing strip under test is increased. At this point, the pressure pump 30 obtains the ultimate pressure at which the sealing surface of the sealing strip under test resists water pressure penetration under different sealing reaction forces, thereby forming different pressure values ​​N2, N4, ... N. 2Y .

[0074] At the same time, it can transfer pressure values ​​N1, N3...N 2Y-1 With pressure values ​​N2, N4...N 2Y By combining these parameters, the pressure values ​​N1, N3, ... N of the sealing surface of the tested sealing strip under maximum water pressure during daily vehicle use can be obtained. 2Y-1 This can achieve waterproofing and leakage prevention, ensuring the performance of the sealing strip while meeting the minimum design requirements, improving the economy of the sealing strip, and reducing design costs.

[0075] During the testing of the sealing strip, water leaking from the strip enters the capillary tube 601. The lamp post 401 illuminates the water containing fluorescent agent, allowing testers to quickly observe the timing and extent of the leak. This allows for rapid and accurate recording of the pressure readings on the pressure gauge 301, improving data accuracy. Simultaneously, the capillary tube 601 guides the leaked water to the absorbent paper 602. If the absorbent paper 602 shows significant localized water absorption, it indicates a potential leak risk in a specific area of ​​the sealing strip. This risk may stem from design flaws or other defects, facilitating improvements. If the absorbent paper 602 is completely soaked, it signifies a complete failure of the sealing surface of the strip. Further design improvements to the sealing surface structure are needed to achieve waterproof pressure penetration resistance.

[0076] Through the above process, water pressure penetration testing of the sealing strip under test can be carried out efficiently, repeatably, and in multiple dimensions. The entire device is simple and efficient to operate and control during testing, with minimal consumption of testing materials, thus saving product trial production costs.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A water pressure penetration testing device for automotive sealing strips, comprising an inlet terminal, a test box, and an outlet terminal connected in sequence, characterized in that, Also includes: A pressurization assembly connected to the water inlet terminal; An observation window is provided on the experimental box, and the observation window is directly opposite the sealing strip. A plurality of mounting pads are detachably installed inside the experimental box and facing the observation window. The sealing strip to be tested is detachably installed between the mounting pads and the observation window. The thickness of the plurality of mounting pads is different, or the thickness of the mounting pads can vary.

2. The water pressure penetration testing device for automotive sealing strips as described in claim 1, characterized in that, The pressurization component includes: A water inlet pipe, which is connected to a water inlet terminal; A booster pump, which is connected to the water inlet pipe; A pressure gauge for measuring water pressure data inside the inlet pipe.

3. The water pressure penetration testing device for automotive sealing strips as described in claim 2, characterized in that, Also includes: A water outlet pipe, which is connected to a water outlet terminal; The water tank is connected to the water outlet pipe, the water inlet pipe, and the booster pump.

4. The water pressure penetration testing device for automotive sealing strips as described in claim 1, characterized in that, It also includes a pressure sensor for measuring the pressure between the sealing strip to be tested and the observation window, the pressure sensor being disposed on the observation window.

5. The water pressure penetration testing device for automotive sealing strips as described in claim 4, characterized in that, The mounting pad has a groove for mounting the sealing strip to be tested, and the axis of the groove is perpendicular to the line connecting the inlet terminal and the outlet terminal.

6. The water pressure penetration testing device for automotive sealing strips as described in claim 1, characterized in that, It also includes a measurement and observation component, which includes: Several capillary tubes are installed side by side on the side of the observation window near the mounting pad. The ends of the capillary tubes can contact or abut against the side of the sealing strip to be tested away from the water inlet terminal. The water tank contains water that contains color or fluorescent agents.

7. The water pressure penetration testing device for automotive sealing strips as described in claim 6, characterized in that, The measurement and observation component also includes: Several absorbent papers are provided, which are detachably installed on the side of the observation window near the mounting pad. The edge of the absorbent paper abuts against the end of several capillaries away from the sealing strip to be tested.

8. The water pressure penetration testing device for automotive sealing strips as described in claim 7, characterized in that, The mounting pad includes: The mounting plate has a first threaded hole on its lower surface and a second threaded hole that coincides with the first threaded hole at the bottom of the experimental box. Fixing screws can be detachably installed at the first threaded hole and the second threaded hole. The support plate has its lower surface facing the upper surface of the mounting plate, and the side walls of the mounting plate and the support plate away from the observation window abut against the side wall of the experimental box. The groove is located on the upper surface of the support plate. An elastic airbag is fixedly installed between a mounting plate and a support plate, with the sidewall of the airbag abutting against the sidewall of the experimental box. An inflation tube passes through one end of the experimental box near the water outlet terminal and is connected to the air bladder; An air pump connected to an inflation tube.

9. The water pressure penetration testing device for automotive sealing strips as described in claim 8, characterized in that, A lamp post is horizontally installed inside the observation window, and the lamp post is opposite to several capillary tubes.

10. A method for testing the water pressure penetration of automotive sealing strips, characterized in that, The device for testing the water pressure penetration of an automotive sealing strip as described in claim 8 or 9 further includes the following steps: Select the appropriate mounting pad according to the thickness of the sealing strip to be tested, remove the observation window on the test box, and install the mounting pad into the test box; install the sealing strip to be tested onto the mounting pad, install the observation window onto the test box, and fit the sealing strip to be tested against the observation window; Connect the water inlet terminal, water outlet terminal, water inlet pipe, water outlet pipe, and water tank of the experimental box; Fill the water tank with water until the liquid level is above the inlet of the tank; The air pump is controlled to inflate or draw air from the airbag. When the pressure value N1 obtained by the pressure sensor reaches the pressure value required for detection at the sealing surface of the sealing strip to be tested, the air pump stops inflating or drawing air. Start the pressure pump to vent air from the water inlet pipe and water inlet terminal, and let water enter the water inlet pipe, water inlet terminal and the end of the experimental box near the water inlet terminal; The pressure pump continuously pressurizes the capillary tube and absorbent paper through the observation window. When the capillary tube shows color or fluorescence, leakage occurs on the sealing surface of the sealing strip under test. Record the pressure value N2 on the pressure gauge at this time. 3-10 seconds after leakage occurs, turn off the pressure pump and record the water absorption traces on the absorbent paper through the capillary tube. Remove the sealing strip to be tested, clean the capillary tube on the observation window, and replace the absorbent paper.

Images