An airtightness test device for a wheel rim lubrication nozzle

Abstract

The present invention relates to the technical field of airtightness test equipment, and specifically discloses an airtightness test equipment for a wheel flange lubrication nozzle, including: a test frame, a test water tank fixedly installed on the inner wall of the bottom of the test frame, and a support plate fixedly installed on the inner wall of the test frame and located above the test water tank. A driving member is fixedly installed on the top of the support plate, and the output end of the driving member slidably penetrates through the support plate and is provided with a lifting portion. In this application, by simulating the usage environmental conditions of the lubrication nozzle and continuously monitoring the airtightness of each lubrication nozzle in the simulated environment, recording the leakage time and leakage points of all nozzles, the sealing performance differences of the nozzles under different conditions can be clearly compared. According to the leakage conditions of all nozzles, the overall tolerance limit of the lubrication nozzle under specific working conditions can be accurately understood, and its adaptability to the actual working conditions can be evaluated. Compared with directly introducing air for testing, the comprehensiveness and accuracy of the test results are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of airtightness test equipment, and more specifically, it relates to an airtightness test equipment for a wheel rim lubrication nozzle. Background Art

[0002] Airtightness is one of the key performance indicators of a wheel rim lubrication nozzle. Through airtightness testing, defects such as poor sealing, tiny cracks or holes that may exist in the nozzle during the production process can be detected in a timely manner. If these problems are not detected before leaving the factory, they will affect the normal use of the product. Therefore, the lubrication nozzle needs to undergo an airtightness test before leaving the factory to ensure its sealing reliability under complex working conditions.

[0003] Currently, when conducting an airtightness test on a lubrication nozzle: The staff places the lubrication nozzle to be tested on a test bench, fixes the nozzle tightly on the test bench by sealing the nozzle opening with a sealing head, then connects the nozzle to a closed pressure system and immerses it in water, and introduces dry air at normal temperature (25°C) and normal pressure (1 atm) into the nozzle. The test pressure is fixed at a static value (such as 0.6 MPa), and then a high-definition camera is used to monitor the situation in the water in real time. If bubbles appear in the water, it is determined that the nozzle has a leak. However, this test method still has certain defects: 1. When there is a water flow impact in the test environment, the fixing force provided by fixing the nozzle tightly on the test bench by sealing the nozzle opening with a sealing head is limited and cannot effectively resist the impact force of the water flow. The lubrication nozzle is extremely likely to displace along the water flow direction, and the tiny vibrations generated during the operation of the test equipment may also gradually accumulate, causing the lubrication nozzle to slowly deviate from its original positioning position.

[0004] 2. When testing, the humidity, temperature fluctuations, gas containing particulate impurities, and pressure transient changes in the use environment of the lubrication nozzle are not simulated. The rubber seal of the lubrication nozzle is prone to swelling in a long-term humid environment, resulting in the loss of sealing interference. Hard particles in the air environment are easily carried by the air flow into the nozzle interior, which is likely to cause wear of the seal. When the lubrication nozzle is in use, the pressure will suddenly rise. The nozzle is prone to delayed rebound of the sealing head under such impact, resulting in instantaneous leakage. The thermal expansion coefficients of the metal shell and the seal of the nozzle are significantly different. When the temperature fluctuates, the seal is overly squeezed and deformed, causing gaps in the sealing surface, and the separation is aggravated when the temperature drops, resulting in periodic leakage caused by periodic fluctuations. The current airtightness test fails to simulate the actual working conditions of the lubrication nozzle, making it difficult to accurately evaluate the adaptability of the lubrication nozzle under actual working conditions. Summary of the Invention

[0005] The present invention provides an airtightness test equipment for a wheel rim lubrication nozzle to solve the above technical problems.

[0006] The present invention provides a wheel rim lubrication nozzle airtightness test device, including: a test rack, a test water tank fixedly installed on the inner wall of the bottom of the test rack, and a support plate fixedly installed on the inner wall of the test rack and located above the test water tank. A driving member is fixedly installed on the top of the support plate, and the output end of the driving member slidably penetrates through the support plate and is provided with a lifting portion.

[0007] The lifting portion includes a lifting plate fixedly installed at the output end of the driving member, and a plurality of lifting guide columns fixedly installed at the bottom of the lifting plate and distributed in a circumferential manner. The bottom ends of the plurality of lifting guide columns are jointly installed with a bearing platform for bearing the airtightness of the test lubrication nozzle, and an installation plate is jointly installed on the outer sides of the plurality of lifting guide columns.

[0008] A test unit for performing airtightness tests on the lubrication nozzle under different conditions and a sealing unit for cooperating with the test unit to seal and position and fix the corresponding lubrication nozzle are provided between the installation plate and the bearing platform.

[0009] The test unit includes a test gas supply pipeline provided in the sealing unit for supplying different gases into the lubrication nozzle. A plurality of limit locking units distributed in a rectangle and corresponding to the sealing unit are provided between the installation plate and the test unit. While the sealing unit seals and positions and fixes the lubrication nozzle, the limit locking units limit and lock the lubrication nozzle and the sealing unit in the horizontal and vertical directions.

[0010] Further, the test unit further includes a positioning component, and the positioning component includes a positioning back plate fixedly installed on the top of the bearing platform and two positioning stop rods fixedly installed on the top of the bearing platform and symmetric to each other.

[0011] Further, the sealing unit includes a plurality of movable sealing components distributed in a rectangle on the top of the bearing platform and corresponding to multiple groups of test units one by one, and a sealing driving component for driving the plurality of movable sealing components to move synchronously to seal the side opening pipelines of the corresponding lubrication nozzles. The sealing driving component includes a driving cylinder fixedly installed on the top of the installation plate and a driving plate fixedly installed at the output end of the driving cylinder. The bottom of the driving plate is fixedly installed with a movable plate through a plurality of buffer springs distributed in a rectangle, and the buffer springs are sleeved on the outer sides of the corresponding lifting guide columns.

[0012] Further, the movable sealing component includes a sliding groove opened on the top of the bearing platform and a slider slidably installed in the sliding groove. A first return spring is jointly installed between the inner wall of the sliding groove far from the center of the bearing platform and the slider. The top of the slider is fixedly installed with a wedge-shaped plate, and a side sealing head for sealing the two side opening pipelines of the lubrication nozzle is fixedly installed on the side of the wedge-shaped plate close to the lubrication nozzle. The top sealing head for sealing the top oil injection port of the lubrication nozzle is fixedly installed at the bottom of the movable plate.

[0013] Further, the sealing drive assembly further includes an extrusion cone fixedly installed at the center of the bottom of the moving plate and used for extruding the wedge plate.

[0014] Further, the test air supply pipeline is fixedly installed in the wedge plate through an installation groove formed in the wedge plate, and the connection between the side sealing head and the side opening pipeline located above is communicated with the test air supply pipeline to supply air into the lubricating nozzle during the test.

[0015] Further, the limit locking unit includes a vertical limit assembly arranged at the bottom of the moving plate and used for vertically limiting the moving sealing assembly and a horizontal locking assembly used for horizontally locking the moving sealing assembly.

[0016] Further, the vertical limit assembly includes a connecting plate fixedly installed at the bottom of the moving plate. One side of the connecting plate close to the center of the bearing table is fixedly installed with a return sleeve through a second return spring. A locking rod that slides through the connecting plate is fixedly installed in the return sleeve. A locking groove matching the locking rod is formed on one side of the positioning back plate close to the locking rod. A limiting plate is fixedly installed on the side of the locking rod away from the center of the bearing table.

[0017] Further, the horizontal locking assembly includes a limit slot formed at the top of the limiting plate and vertically penetrating the limiting plate. A limit pin that slides through the moving plate and matches the limit slot is fixedly installed at the bottom of the driving plate.

[0018] Further, the driving member is a hydraulic cylinder. A plurality of limit rods that slide through the support plate and are distributed in a rectangular shape are fixedly installed at the top of the lifting plate. The limit rods limit and guide the lifting plate when the driving member drives the lifting plate to move up and down.

[0019] The beneficial effects of the present invention are as follows: 1. In this application, the positioning assembly realizes the precise positioning of the lubricating nozzle through the positioning back plate and two symmetrically arranged positioning stop rods. The positioning back plate provides a stable reference surface for the lubricating nozzle in the horizontal direction, and the positioning stop rods effectively limit the circumferential rotation of the lubricating nozzle, ensuring that the lubricating nozzle is fixed in the circumferential direction, thereby ensuring the stable position of the nozzle during the test and laying a foundation for subsequent sealing operations and the accuracy of test results.

[0020] 2. In this application, by simulating the usage environment conditions of the lubricating nozzle and continuously monitoring the airtightness of each lubricating nozzle in the simulated environment, recording the leakage time and leakage points of all nozzles, the sealing performance differences of the nozzles under different conditions can be clearly compared. According to the leakage conditions of all nozzles, the overall tolerance limit of the lubricating nozzle under specific working conditions can be accurately understood, and its adaptability to the actual working conditions can be evaluated. Compared with directly introducing air for testing, the comprehensiveness and accuracy of the test results are greatly improved.

[0021] 3. In this application, multiple movable sealing components work in cooperation with the sealing drive component. When the movable plate moves downward, it drives the extrusion cone to extrude the wedge-shaped plate, causing the wedge-shaped plate to drive the side sealing head to move and closely fit the side opening pipeline of the lubricating nozzle. At the same time, the upper sealing head at the bottom of the movable plate fits the top oil injection port to complete the all-round sealing. And while completing the sealing, the side sealing head presses the lubricating nozzle against the positioning back plate, strengthening the positioning and fixing in the horizontal direction; the upper sealing head presses the lubricating nozzle against the top of the bearing platform, stabilizing the positioning in the vertical direction, realizing the all-round fixing of the lubricating nozzle. The multiple positioning and fixing mechanisms greatly improve the stability of the lubricating nozzle during the test, effectively avoiding sealing failure or test errors caused by displacement or shaking, and ensuring the accuracy and reliability of the airtightness test results.

[0022] 4. In this application, under the multi-stage limit locking mechanism, the vertical limit component cooperates with the locking groove on the positioning back plate through the locking rod to complete the locking and limiting in the vertical direction synchronously during the sealing and positioning process; after the vertical limit is completed, the horizontal locking component realizes the locking in the horizontal direction through the cooperation of the limit pin and the limit slot. The two are synchronous and linked, so that the lubricating nozzle is firmly fixed during the test process, greatly improving the stability during the entire test process, effectively resisting external forces such as water pressure and buoyancy in the test water tank, and ensuring the continuous and stable progress of the test. Brief Description of the Drawings

[0023] Figure 1 is a three-dimensional structural schematic diagram of the present invention.

[0024] Figure 2 is a partial three-dimensional structural schematic diagram of the test unit, sealing unit, lifting part, driving part and support plate of the present invention.

[0025] Figure 3 is a partial three-dimensional structural schematic diagram of the lifting plate, lifting guide column, bearing platform, driving cylinder and extrusion cone of the present invention.

[0026] Figure 4 is a partial three-dimensional structural schematic diagram of the driving plate, movable plate, buffer spring and wedge-shaped plate of the present invention.

[0027] Figure 5 is a partial three-dimensional structural schematic diagram of the chute, wedge-shaped plate, side sealing head, lubricating nozzle, positioning back plate and positioning stop rod of the present invention.

[0028] Figure 6 is a partial three-dimensional structural schematic diagram of the connecting plate, second return spring, return sleeve, locking rod and locking groove of the present invention.

[0029] In the figure: 1. Test rack; 2. Test water tank; 3. Support plate; 4. Driving member; 5. Lifting part; 501. Lifting plate; 502. Lifting guide post; 503. Bearing platform; 6. Lubricating nozzle; 7. Testing unit; 701. Positioning component; 702. Test air supply pipeline; 7011. Positioning back plate; 7012. Positioning stop bar; 8. Sealing unit; 801. Movable sealing component; 802. Sealing driving component; 8011. Chute; 8012. Slide block; 8013. Wedge plate; 8014. Side sealing head; 8015. Upper sealing head; 8016. First return spring; 8021. Extrusion cone; 8022. Driving cylinder; 8023. Driving plate; 8024. Movable plate; 8025. Buffer spring; 9. Limit locking unit; 901. Vertical limit component; 902. Horizontal locking component; 9011. Connecting plate; 9012. Second return spring; 9013. Return sleeve; 9014. Locking rod; 9015. Locking groove; 9016. Limit plate; 9021. Limit slot; 9022. Limit pin; 10. Mounting plate; 11. Limit rod. Detailed implementation mode

[0030] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that these embodiments are discussed so that those skilled in the art can better understand and thus implement the subject matter described herein. The functions and arrangements of the elements discussed can be changed without departing from the scope of protection of the content of this specification. Each example can omit, substitute, or add various processes or components as needed. Additionally, the features described relative to some examples can also be combined in other examples.

[0031] Example 1:

[0032] Refer to Figure 1 and Figure 3 , in this embodiment, a rim lubricating nozzle airtightness test device is proposed, including a test rack 1, a test water tank 2 fixedly installed on the inner wall of the bottom of the test rack 1, and a support plate 3 fixedly installed on the inner wall of the test rack 1 and located above the test water tank 2. A driving member 4 is fixedly installed on the top of the support plate 3, and the output end of the driving member 4 slidably penetrates through the support plate 3 and is provided with a lifting part 5.

[0033] Refer to Figure 1 , Figure 2 and Figure 3, the lifting part 5 includes a lifting plate 501 fixedly installed at the output end of the driving member 4, and a plurality of lifting guide columns 502 fixedly installed at the bottom of the lifting plate 501 and distributed in a circular pattern. At the top of the lifting plate 501, a plurality of limiting rods 11 are fixedly installed and slide through the support plate 3 in a rectangular distribution. At the bottom ends of the plurality of lifting guide columns 502, a bearing platform 503 for bearing the airtightness of the test lubrication nozzle 6 is jointly installed. On the outer sides of the plurality of lifting guide columns 502, a mounting plate 10 is jointly installed. Between the mounting plate 10 and the bearing platform 503, a test unit 7 for performing airtightness tests on the lubrication nozzle 6 under different conditions and a sealing unit 8 for cooperatively positioning and fixing the corresponding lubrication nozzle 6 in cooperation with the test unit 7 are provided.

[0034] It should be noted that before starting the test, a certain amount of clear water is first injected into the test water tank 2, and the amount of water injection needs to be able to submerge the lubrication nozzle 6. The driving member 4 uses a conventional hydraulic cylinder. At the start of the test, the output end of the driving member 4 pushes the lifting plate 501 downward, driving the lubrication nozzle 6 on the top of the bearing platform 503 to be submerged in the clear water for the test. The limiting rods 11 perform limiting and guiding when the lifting plate 501 moves up and down.

[0035] Refer to Figure 2 、 Figure 3 、 Figure 4 and Figure 5 , the test unit 7 includes a positioning component 701 and a test gas supply pipeline 702 provided in the sealing unit 8 for supplying different gases to the lubrication nozzle 6. Between the mounting plate 10 and the test unit 7, a plurality of limiting and locking units 9 distributed in a rectangular pattern and corresponding to the sealing unit 8 are provided. While the sealing unit 8 cooperates with the positioning component 701 to seal and position-fix the lubrication nozzle 6, the limiting and locking units 9 perform horizontal and vertical limiting and locking on the lubrication nozzle 6 and the sealing unit 8.

[0036] It should be noted that the test unit 7 is set to four. Before the start of the test, the four test gas supply pipelines 702 are first connected to an external gas supply source. The four test gas supply pipelines 702 are respectively connected to a humidity adjustment gas pipeline, a temperature simulation gas pipeline, an impurity simulation gas pipeline, and a pressure fluctuation simulation gas pipeline. The pipeline interfaces are sealed with sealant to prevent gas leakage.

[0037] The humidity adjustment gas pipeline is connected to the gas output after passing through the humidity adjustment module. The humidity is controlled at 60%-80%RH, which is the gas after adding water vapor to dry air and is used to simulate the humidity environment in the lubrication nozzle usage environment.

[0038] The temperature-simulated gas pipeline is connected to the gas output from the temperature regulation module. Since the temperature in the use environment fluctuates with seasons and the operating conditions of the equipment, the temperature range is 28 - 32 °C in summer and 18 - 22 °C in winter. The gas transported by this pipeline will simulate the temperature of the above actual working conditions.

[0039] The impurity-containing simulated gas pipeline is connected to the gas output from the impurity addition module. This gas is added with simulated dust particles such as silicon dioxide and iron oxide according to the actual concentration and particle size distribution of dust particles in the use environment. The particle size is concentrated in the range of 0.1 - 10 microns, and it can simulate the air environment containing impurities in the use environment.

[0040] The pressure-fluctuation-simulated gas pipeline is connected to the gas transmission pipeline equipped with a pressure fluctuation generator. The gas output by it simulates a pressure between 0.8 - 1.2 standard atmospheric pressures and fluctuates at a certain frequency, which can effectively simulate the different pressure change environments that the lubricating nozzle bears under different conditions.

[0041] Pressure sensors (accuracy ±0.1%FS), temperature sensors, humidity sensors, and impurity concentration sensors are respectively installed at the side opening pipelines above the four lubricating nozzles 6, which are respectively used to monitor the internal pressure change of the lubricating nozzle 6, the temperature, humidity, and impurity concentration of the gas entering the lubricating nozzle 6 in real time.

[0042] The above-mentioned temperature and humidity regulation module, impurity addition module, pressure fluctuation generator, pressure sensor, temperature sensor, humidity sensor, and impurity concentration sensor used in the test process are all well-known common knowledge to those skilled in the art, so they will not be described in detail in this application.

[0043] Before starting the test, the lubricating nozzle 6 is fixed by the positioning component 701. Then, the lubricating nozzle 6 is hermetically positioned and fixed by the sealing unit 8. Then, the carrier table 503 is controlled to move downward, and the lubricating nozzle 6 on its top is immersed in clear water. After waiting for the water flow to tend to be stable and stationary, the test is started: first, the temperature, humidity, pressure, and gas impurity concentration parameters inside the four lubricating nozzles 6 in the initial state are measured by sensors respectively. Then, the gas source module, humidity regulation module, impurity addition module, and pressure fluctuation generator are sequentially turned on. The four kinds of gases in the use environment are respectively introduced into the lubricating nozzle 6 through the test gas supply pipeline 702. Then, the changes of various factors and the airtightness of the lubricating nozzle 6 are continuously monitored. Every 15 minutes, the simulated environment parameters are adjusted appropriately. The pressure fluctuation frequency and amplitude are changed by the pressure fluctuation generator. When simulating the use environment in different seasons, the set temperature of the temperature regulation module and the set humidity of the humidity regulation module are adjusted.

[0044] During the test, the water surface conditions at the positions of each lubrication nozzle 6 in the test pool 2 were continuously observed through a high-definition camera. Since bubbles would emerge in the water at the position of a certain lubrication nozzle 6 when it leaked, once bubbles were found, it meant that the lubrication nozzle 6 was leaking. The leakage time of the lubrication nozzle 6 was immediately recorded, and the leakage point was judged based on the position of the bubbles. Finally, until all the lubrication nozzles 6 leaked, the leakage times and leakage points of the four lubrication nozzles 6 were recorded. According to the situation where all the lubrication nozzles 6 leaked, the overall tolerance limit of the lubrication nozzles 6 under specific simulated working conditions was understood, that is, the approximate time range during which the lubrication nozzles 6 could maintain sealing under the conditions of this pressure, humidity, temperature, or impurity-containing gas was understood, providing a direction for the overall design optimization of the lubrication nozzles, such as adjusting the sealing material, improving the structural shape, etc.

[0045] Refer to Figure 2 、 Figure 4 、 Figure 5 and Figure 6 The positioning assembly 701 includes a positioning back plate 7011 fixedly installed on the top of the carrier 503 and two positioning stop bars 7012 fixedly installed on the top of the carrier 503 and symmetric to each other.

[0046] Refer to Figure 4 、 Figure 5 and Figure 6 Before starting the test, the lubrication nozzle 6 was abutted against the positioning back plate 7011 and the two side opening pipes of the lubrication nozzle 6 were placed between the two positioning stop bars 7012. The positioning back plate 7011 provided a fixed reference plane for the lubrication nozzle 6 in the horizontal direction, and the positioning stop bars 7012 restricted the circumferential rotation of the lubrication nozzle 6, so that the lubrication nozzle 6 was fixed between the positioning stop bars 7012 and could not rotate, for positioning the lubrication nozzle 6.

[0047] Refer to Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 The sealing unit 8 includes a plurality of movable sealing components 801 arranged in a rectangular distribution on the top of the carrier 503 and corresponding to multiple groups of positioning components 701 one by one, and a sealing driving component 802 for driving the plurality of movable sealing components 801 to move synchronously to seal the side opening pipes of the corresponding lubrication nozzles 6. The sealing driving component 802 includes a driving cylinder 8022 fixedly installed on the top of the mounting plate 10 and a driving plate 8023 fixedly installed at the output end of the driving cylinder 8022. A movable plate 8024 is fixedly installed at the bottom of the driving plate 8023 through a plurality of buffer springs 8025 distributed in a rectangular shape, and the buffer springs 8025 are sleeved on the outside of the corresponding lifting guide posts 502.

[0048] It should be noted that four high-definition cameras (not shown in the figure) are installed at the bottom of the moving plate 8024 to respectively monitor the test processes of four groups of lubricating nozzles 6 in real time.

[0049] Refer to Figure 3 、 Figure 4 、 Figure 5 and Figure 6 The moving seal assembly 801 includes a chute 8011 opened at the top of the bearing platform 503 and a slider 8012 slidably installed in the chute 8011. A first return spring 8016 is jointly installed between the inner wall of one side of the chute 8011 away from the center of the bearing platform 503 and the slider 8012. A wedge plate 8013 is fixedly installed at the top of the slider 8012. A side seal head 8014 for sealing the two side opening pipes of the lubricating nozzle 6 is fixedly installed on one side of the wedge plate 8013 close to the lubricating nozzle 6. An upper seal head 8015 for sealing the top oil injection port of the lubricating nozzle 6 is fixedly installed at the bottom of the moving plate 8024.

[0050] Refer to Figure 4 、 Figure 5 and Figure 6 The test air supply pipe 702 is fixedly installed in the wedge plate 8013 through an installation groove opened in the wedge plate 8013. The connection between the side seal head 8014 and the upper side opening pipe is connected to the test air supply pipe 702 to supply air to the lubricating nozzle 6 during the test.

[0051] Refer to Figure 3 、 Figure 4 、 Figure 5 and Figure 6 The seal driving assembly 802 further includes an extrusion cone 8021 fixedly installed at the center of the bottom of the moving plate 8024 and used for extruding the wedge plate 8013. By moving the extrusion cone 8021 downward to extrude the wedge plate 8013, the wedge plate 8013 will drive the side seal head 8014 to move and seal the two side opening pipes of the lubricating nozzle 6.

[0052] Refer to Figure 4 、 Figure 5 and Figure 6, before starting the test, it is necessary to seal and further position and fix the lubricating nozzle 6. Specifically, start the driving cylinder 8022. When the output end of the driving cylinder 8022 pushes the driving plate 8023 downward, it will drive the moving plate 8024 downward synchronously through the buffer spring 8025, making the upper sealing head 8015 gradually approach the top oil injection port of the lubricating nozzle 6. At the same time, the extrusion cone 8021 gradually approaches and squeezes the wedge surface of the wedge plate 8013, thereby driving the side sealing head 8014 to gradually approach the two side opening pipes of the lubricating nozzle 6 through the wedge plate 8013 until the side sealing head 8014 tightly adheres to the two side opening pipes and the upper sealing head 8015 tightly adheres to the top oil injection port of the lubricating nozzle 6, thus completing the sealing of the lubricating nozzle 6. And at this time, the side sealing head 8014 presses the lubricating nozzle 6 against the positioning back plate 7011 to achieve further positioning and fixing of the lubricating nozzle 6 in the horizontal direction. The upper sealing head 8015 presses the lubricating nozzle 6 against the top of the bearing table 503 to achieve further positioning and fixing of the lubricating nozzle 6 in the vertical direction, and further realizes the all-round fixing of the lubricating nozzle 6.

[0053] Refer to Figure 4 , Figure 5 and Figure 6 , the limit locking unit 9 includes a vertical limit component 901 arranged at the bottom of the moving plate 8024 and used for vertically limiting the moving sealing assembly 801 and a horizontal locking component 902 used for horizontally locking the moving sealing assembly 801. The vertical limit component 901 includes a connecting plate 9011 fixedly installed at the bottom of the moving plate 8024. A reset sleeve 9013 is fixedly installed on one side of the connecting plate 9011 close to the center of the bearing table 503 through a second reset spring 9012. A locking rod 9014 that slides through the connecting plate 9011 is fixedly installed inside the reset sleeve 9013. A locking groove 9015 that matches the locking rod 9014 is opened on one side of the positioning back plate 7011 close to the locking rod 9014. A limit plate 9016 is fixedly installed on the side of the locking rod 9014 away from the center of the bearing table 503. When the second reset spring 9012 is in the natural state, the limit plate 9016 abuts against the connecting plate 9011.

[0054] Refer to Figure 4 , Figure 5 and Figure 6 , the horizontal locking component 902 includes a limit slot 9021 opened at the top of the limit plate 9016 and vertically penetrating the limit plate 9016. A limit pin 9022 that slides through the moving plate 8024 and matches the limit slot 9021 is fixedly installed at the bottom of the driving plate 8023. When the locking rod 9014 is inserted into the locking groove 9015, the limit pin 9022 is inserted into the limit slot 9021 to lock the locking rod 9014 and lock the moving sealing assembly 801 in the horizontal direction.

[0055] It should be noted that a slope is provided on the top of the positioning back plate 7011 on the side far from the center of the carrier table 503. When the locking rod 9014 moves downward, it will squeeze the slope, causing the locking rod 9014 to move towards the side close to the connecting plate 9011 and finally be able to snap into the locking groove 9015.

[0056] The deformation of the buffer spring 8025 during the process of sealing, positioning and fixing the lubricating nozzle 6 will not cause the moving plate 8024 to move downward excessively, so that the limit pin 9022 squeezes the limit plate 9016 before it is inserted into the limit slot 9021. Instead, a reasonable space and stroke will be reserved to ensure that the limit pin 9022 can be inserted into the limit slot 9021 after the sealing, positioning and fixing of the lubricating nozzle 6 are completed, realizing the locking of the locking rod 9014, and then locking the moving sealing assembly 801 in the horizontal direction.

[0057] Refer to Figure 4 、 Figure 5 and Figure 6 During the process that the driving plate 8023 drives the moving plate 8024 to move downward to drive the moving sealing assembly 801 to seal, position and fix the lubricating nozzle 6, the connecting plate 9011 will also move downward synchronously, driving the locking rod 9014 to move downward and squeeze the slope on the top of the positioning back plate 7011, causing the locking rod 9014 to move towards the side close to the connecting plate 9011, and then continue to move with the connecting plate 9011. The locking rod 9014 moves through the slope and reaches the side of the positioning back plate 7011 far from the center of the carrier table 503, and finally snaps into the locking groove 9015.

[0058] When the locking rod 9014 snaps into the locking groove 9015, it means that the upper sealing head 8015 and the side sealing head 8014 just complete the sealing, positioning and fixing of the lubricating nozzle 6 at this time, avoiding deformation of the lubricating nozzle 6 caused by excessive extrusion. At the same time, the locking rod 9014 snapping into the locking groove 9015 can lock and limit the moving plate 8024 in the vertical direction. Then, when the driving plate 8023 continues to move, it cannot continue to push the moving plate 8024 downward (because the locking rod 9014 is inserted into the locking groove 9015 at this time). The driving plate 8023 continuing to move downward will continue to compress the buffer spring 8025 and drive the limit pin 9022 to move downward. Finally, the limit pin 9022 is inserted into the limit slot 9021 to lock the locking rod 9014 in the horizontal direction, thus realizing the multi-stage locking and limiting of the moving plate 8024, avoiding the movement of the moving plate 8024 under the action of water pressure or buoyancy after entering the test water tank 2, and then ensuring the stability of the extrusion cone 8021, avoiding the loosening of the extrusion cone 8021 resulting in the loosening of the sealing and positioning of the lubricating nozzle 6, greatly improving the stability of the sealing, positioning and fixing of the lubricating nozzle 6, and directly improving the stability of the airtightness test, making the test results more accurate.

[0059] Example 2:

[0060] This example is an improvement on Example 1. The difference lies in that: on the basis of the existing lubricating nozzle test group, an additional lubricating nozzle test group is added, and then a main mixed gas pipeline is installed. The output ends of the humidity adjustment module, temperature adjustment module, impurity addition module, and pressure fluctuation generator are connected to the main mixed gas pipeline through their respective independent branch pipelines. A flow regulating valve and a check valve are installed on each branch pipeline. The flow regulating valve is used to accurately control the mixing ratio of different gas components, and the check valve is used to prevent gas backflow to ensure the stable and accurate delivery of the mixed gas.

[0061] During the test, set the target parameters of the mixed gas. The pressure range is set at 0.8 - 1.2 standard atmospheres, the humidity is controlled at 60% - 80%RH, the temperature simulates 28 - 32°C in summer and 18 - 22°C in winter, and the impurity components and concentrations are based on the actual concentration and particle size distribution of dust particles in the use environment. Simulated dust particles such as silicon dioxide and iron oxide are added, and the particle size is concentrated in the range of 0.1 - 10 microns.

[0062] During the test process, with other lubricating nozzle tests unchanged, the mixed gas is filled into the lubricating nozzle 6 of the newly added lubricating nozzle test group through the main mixed gas pipeline. The simulated environment parameters are adjusted every 15 minutes in a timely manner, and the pressure fluctuation frequency and amplitude are changed through the pressure fluctuation generator. When simulating the use environment in different seasons, adjust the set temperature of the temperature adjustment module and the set humidity of the humidity adjustment module to ensure that the test process can simulate the actual comprehensive working conditions to the greatest extent.

[0063] Throughout the test process, continuously record the leakage time, leakage points of the newly added lubricating nozzle 6, and the changing data of pressure, temperature, humidity, and impurity concentration monitored by the sensor over time. According to the leakage situation of the newly added lubricating nozzle 6, analyze the overall tolerance limit of the lubricating nozzle 6 under this comprehensive simulated working condition, that is, understand the approximate time range during which the lubricating nozzle 6 can maintain its seal under the comprehensive conditions of this pressure, humidity, temperature, and impurity-containing gas, and evaluate the difference in its adaptability to similar actual working conditions, providing a more comprehensive and accurate reference basis for the estimation of the maintenance cycle and service life in actual applications.

[0064] Finally, it should be noted that: Obviously, the above examples are merely illustrations for clearly explaining the present invention and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. A wheel rim lubrication nozzle air tightness test device, comprising: A test rack, a test water pool fixedly mounted on the inner wall of the bottom of the test rack, and a support plate fixedly mounted on the inner wall of the test rack and located above the test water pool, characterized in that a driving member is fixedly mounted on the top of the support plate, and an output end of the driving member slides through the support plate and is provided with a lifting portion; The lifting part includes a lifting plate fixedly mounted on the output end of the driving member, a plurality of lifting guide columns fixedly mounted on the bottom of the lifting plate and distributed in a circumference, a bearing platform for carrying the air tightness test lubrication nozzle is commonly mounted on the bottom ends of the plurality of lifting guide columns, and a mounting plate is commonly mounted on the outer sides of the plurality of lifting guide columns; A test unit for performing air tightness tests on the lubrication nozzle under different conditions and a sealing unit for cooperating with the test unit to seal, position and fix the corresponding lubrication nozzle are arranged between the mounting plate and the bearing platform; The test unit includes a test gas supply pipeline arranged in the sealing unit for supplying different gases to the lubrication nozzle. A plurality of position limiting and locking units corresponding to the sealing unit and distributed in a rectangular shape are arranged between the mounting plate and the test unit. When the sealing unit seals and positions the lubrication nozzle, the position limiting and locking unit performs position limiting and locking on the lubrication nozzle and the sealing unit in the horizontal and vertical directions. The sealing unit includes a plurality of movable sealing assemblies arranged in a rectangular distribution on the top of the bearing platform and corresponding to the plurality of test units one by one, and a sealing driving assembly used to drive the plurality of movable sealing assemblies to synchronously move to seal the side opening pipes of the corresponding lubrication nozzles, the sealing driving assembly includes a driving cylinder fixedly installed on the top of the mounting plate and a driving plate fixedly installed on the output end of the driving cylinder, the bottom of the driving plate is fixedly installed with the movable plate through a plurality of buffer springs distributed in a rectangular shape, and the buffer springs are sleeved on the outer sides of the corresponding lifting guide columns; The movable sealing assembly comprises a slide groove provided on the top of the bearing platform and a slider slidably installed in the slide groove, a return spring 1 is installed between the inner wall of the slide groove away from the center of the bearing platform and the slider, a wedge plate is fixedly installed on the top of the slider, a side sealing head for sealing two side opening pipes of the lubrication nozzle is fixedly installed on the side of the wedge plate close to the lubrication nozzle, and an upper sealing head for sealing the oil injection port at the top of the lubrication nozzle is fixedly installed on the bottom of the movable plate; The sealing drive assembly also includes an extrusion cone which is fixedly installed at the bottom center of the moving plate and is used for extruding the wedge plate.

2. The wheel rim lubrication nozzle air tightness test equipment according to claim 1, characterized in that: The test unit further comprises a positioning assembly, which comprises a positioning back plate fixedly mounted on the top of the bearing platform and two positioning blocking rods fixedly mounted on the top of the bearing platform and symmetrical to each other.

3. The wheel rim lubrication nozzle air tightness test equipment according to claim 1, characterized in that: The test air supply pipeline is fixedly installed in the wedge plate through the installation groove opened in the wedge plate, and the side sealing head is connected to the test air supply pipeline at the joint of the side opening pipeline located above, so as to supply air to the lubrication nozzle during the test.

4. The wheel rim lubrication nozzle air tightness test equipment according to claim 1, characterized in that: The limiting and locking unit comprises a vertical limiting component which is arranged at the bottom of the movable plate and is used to limit the movable sealing component in the vertical direction, and a horizontal locking component which is used to lock the movable sealing component in the horizontal direction.

5. The wheel rim lubrication nozzle air tightness test equipment according to claim 4, characterized in that: The vertical limit assembly includes a connecting plate fixedly installed on the bottom of the movable plate, a reset sleeve is fixedly installed on the side of the connecting plate close to the center of the bearing platform through a reset spring, a locking rod that slides through the connecting plate is fixedly installed in the reset sleeve, a locking groove that matches the locking rod is opened on the side of the positioning back plate close to the locking rod, and a limit plate is fixedly installed on the side of the locking rod away from the center of the bearing platform.

6. The wheel rim lubrication nozzle air tightness test equipment according to claim 5, characterized in that: The horizontal locking assembly includes a limiting slot which is opened on the top of the limiting plate and vertically penetrates the limiting plate, and a limiting pin which slides through the moving plate and matches with the limiting slot is fixedly installed at the bottom of the driving plate.

7. The wheel rim lubrication nozzle air tightness test equipment according to claim 1, characterized in that: The driving member is a hydraulic cylinder, and a plurality of limiting rods which slide through the support plate and are distributed in a rectangular shape are fixedly installed on the top of the lifting plate. The limiting rods limit and guide the lifting plate when the driving member drives the lifting plate to move up and down.

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