Airtightness test equipment for wheel flange lubrication nozzle

Abstract

The invention relates to the technical field of air tightness test equipment, and particularly discloses rim lubrication nozzle air tightness test equipment which comprises a test rack, a test pool fixedly mounted on the inner wall of the bottom of the test rack and a supporting plate fixedly mounted on the inner wall of the test rack and located above the test pool, and a driving part is fixedly mounted on the top of the supporting plate. The output end of the driving part slidably penetrates through the supporting plate and is provided with a lifting part, in the application, by simulating the use environment conditions of the lubricating nozzles, continuously monitoring the air tightness of the lubricating nozzles in the simulated environment and recording the leakage time and leakage points of all the nozzles, the sealing performance differences of the nozzles under different conditions can be clearly compared, and the sealing performance of the nozzles under different conditions can be accurately compared. According to the leakage conditions of all the nozzles, the overall tolerance limit of the lubricating nozzle under the specific working condition can be accurately known, the adaptive capacity of the lubricating nozzle to the actual working condition is evaluated, and the comprehensiveness and the accuracy of the test result are greatly improved compared with the mode that air is directly introduced for testing.

Description

Technical Field

[0001] The invention relates to the technical field of air tightness testing equipment, and more specifically, to an air tightness testing equipment for a wheel rim lubrication nozzle. Background Art

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

[0003] At present, when the lubrication nozzle is undergoing an air tightness test: the staff places the lubrication nozzle to be tested on the test bench, and fixes the nozzle tightly on the test bench while sealing the nozzle opening with a sealing head. Then, the nozzle is connected to a closed pressure system and immersed in water. Dry air at room temperature (25°C) and pressure (1atm) is introduced into the nozzle. The test pressure is fixed to a static value (such as 0.6MPa). 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 is leaking. However, this test method still has certain defects: 1. When there is water flow impact in the test environment, the fixing force provided by fixing the nozzle tightly on the test bench while 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 very easy to move along the direction of the water flow, 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. The test did not simulate the humidity, temperature fluctuations, gas containing particulate impurities and transient pressure changes in the use environment of the lubrication nozzle. The rubber seal of the lubrication nozzle is prone to swelling in a long-term humid environment, resulting in loss of sealing interference. Hard particles in the air environment are carried into the nozzle by the airflow, which can easily cause wear of the seal. When the lubrication nozzle is used, a sudden pressure rise will occur. Under such impact, the nozzle is prone to delayed rebound of the sealing head, causing instantaneous leakage. The thermal expansion coefficients of the metal shell of the nozzle and the seal are significantly different. When the temperature fluctuates, the seal is over-extended and deformed, resulting in gaps on the sealing surface. The temperature drop aggravates the separation, and periodic fluctuations cause periodic leakage. The current air tightness test fails to simulate the actual working conditions of the lubrication nozzle, making it difficult to accurately evaluate the adaptability of the lubrication nozzle in actual working conditions. Summary of the invention

[0005] The invention provides a wheel rim lubrication nozzle air tightness test device to solve the above technical problems.

[0006] The present invention provides a wheel rim lubrication nozzle air tightness test device, comprising: a test frame, a test water pool 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 pool, a driving member is fixedly installed on the top of the support plate, and the output end of the driving member slides through the support plate and is provided with a lifting part.

[0007] The lifting part includes a lifting plate fixedly installed at the output end of the driving part, a plurality of lifting guide columns fixedly installed at the bottom of the lifting plate and distributed in a circle, a bearing platform for testing the air tightness of the lubrication nozzle is commonly installed at the bottom ends of the plurality of lifting guide columns, and a mounting plate is commonly installed on the outer sides of the plurality of lifting guide columns.

[0008] A testing unit for performing air tightness tests on the lubrication nozzle under different conditions and a sealing unit for cooperating with the testing unit to seal, position and fix the corresponding lubrication nozzle are arranged between the mounting plate and the supporting platform.

[0009] The test unit includes a test air supply pipeline arranged in the sealing unit for supplying different gases to the lubrication nozzle. A plurality of limit locking units distributed in a rectangular shape and corresponding to the sealing unit are arranged between the mounting plate and the test unit. While the sealing unit seals and positions the lubrication nozzle, the limit locking unit limits and locks the lubrication nozzle and the sealing unit in horizontal and vertical directions.

[0010] Furthermore, the test unit further comprises a positioning assembly, wherein the positioning assembly 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.

[0011] Furthermore, the sealing unit includes a plurality of movable sealing assemblies which are arranged in a rectangular distribution on the top of the supporting platform and correspond one-to-one to the plurality of test units, and a sealing driving assembly for driving the plurality of movable sealing assemblies to move synchronously to seal the side opening pipes of the corresponding lubrication nozzles. The sealing driving assembly includes a driving cylinder fixedly mounted on the top of the mounting plate and a driving plate fixedly mounted on the output end of the driving cylinder. The bottom of the driving plate is fixedly mounted with the movable plate by a plurality of buffer springs distributed in a rectangular distribution. The buffer springs are sleeved on the outer side of the corresponding lifting guide column.

[0012] Furthermore, the movable sealing assembly includes a slide groove opened on the top of the bearing platform and a slider slidably installed in the slide groove, a return spring 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 the 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.

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

[0014] Furthermore, the test air supply pipeline is fixedly installed in the wedge plate through a mounting groove opened in the wedge plate, and the side sealing head is connected to the side opening pipeline at the top and is connected to the test air supply pipeline to supply air to the lubrication nozzle during the test.

[0015] Furthermore, the limiting and locking unit includes a vertical limiting component arranged at the bottom of the movable plate and used to limit the movable sealing component in the vertical direction, and a horizontal locking component used to lock the movable sealing component in the horizontal direction.

[0016] Furthermore, 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 is fixedly installed in the reset sleeve and slides through the connecting plate, a locking groove matching the locking rod is provided 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.

[0017] Furthermore, the horizontal locking assembly includes a limiting slot opened at the top of the limiting plate and vertically penetrating the limiting plate, and a limiting pin is fixedly installed at the bottom of the driving plate, which slides through the moving plate and cooperates with the limiting slot.

[0018] Furthermore, 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.

[0019] The beneficial effects of the present invention are: 1. In the present application, the positioning assembly realizes precise positioning of the lubrication nozzle through a positioning back plate and two mutually symmetrical positioning baffles. The positioning back plate provides a stable reference surface for the lubrication nozzle in the horizontal direction, and the positioning baffles effectively limit the circumferential rotation of the lubrication nozzle, ensuring that the lubrication nozzle is fixed in the circumferential direction, thereby ensuring that the nozzle position is stable during the test, laying the foundation for the subsequent sealing operation and the accuracy of the test results.

[0020] 2. In the present application, by simulating the environmental conditions for the use of the lubrication nozzles, continuously monitoring the air tightness of each lubrication nozzle in the simulated environment, and recording the leakage time and leakage point 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 actual working conditions can be evaluated. Compared with the test by directly introducing air, the comprehensiveness and accuracy of the test results are greatly improved.

[0021] 3. In the present application, multiple movable sealing assemblies work together with the sealing drive assembly. The movable plate moves downward to drive the extrusion cone to extrude the wedge plate, so that the wedge plate drives the side sealing head to move and fits tightly against the side opening pipe of the lubrication nozzle. At the same time, the upper sealing head at the bottom of the movable plate fits against the top oil injection port to complete all-round sealing. While completing the sealing, the side sealing head presses the lubrication nozzle against the positioning back plate, thereby strengthening the horizontal positioning and fixation. The upper sealing head presses the lubrication nozzle against the top of the carrier platform, thereby stabilizing the vertical positioning and achieving all-round fixation of the lubrication nozzle. The multiple positioning and fixing mechanisms greatly improve the stability of the lubrication nozzle during the test, effectively avoiding sealing failure or test errors caused by displacement or shaking, and ensuring the accuracy and reliability of the air tightness test results.

[0022] 4. In the present application, under the multi-stage limit locking mechanism, the vertical limit assembly cooperates with the locking groove on the positioning back plate through the locking rod to synchronously complete the vertical locking limit during the sealing positioning process; after the vertical limit is completed, the horizontal locking assembly cooperates with the limit pin and the limit slot to achieve horizontal locking. The two are synchronized and linked, so that the lubrication nozzle is firmly fixed during the test, which greatly improves the stability of the entire test process, effectively resists external forces such as water pressure and buoyancy in the test water pool, and ensures that the test is carried out continuously and stably. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 2 It is a schematic diagram of the three-dimensional structure of the test unit, sealing unit, lifting part, driving member and supporting plate of the present invention.

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

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

[0027] Figure 5 It is a schematic diagram of the three-dimensional structure of the slide groove, wedge plate, side sealing head, lubrication nozzle, positioning back plate and positioning stop rod part of the present invention.

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

[0029] In the figure: 1. test frame; 2. test water tank; 3. support plate; 4. driving member; 5. lifting part; 501. lifting plate; 502. lifting guide column; 503. bearing platform; 6. lubrication nozzle; 7. test unit; 701. positioning assembly; 702. test air supply pipeline; 7011. positioning back plate; 7012. positioning stop rod; 8. sealing unit; 801. moving sealing assembly; 802. sealing driving assembly; 8011. slideway; 8012. slide block; 8013. wedge plate; 8014. side sealing head; 8015 , upper sealing head; 8016, reset spring one; 8021, extrusion cone; 8022, driving cylinder; 8023, driving plate; 8024, moving plate; 8025, buffer spring; 9, limit locking unit; 901, vertical limit assembly; 902, horizontal locking assembly; 9011, connecting plate; 9012, reset spring two; 9013, reset sleeve; 9014, locking rod; 9015, locking groove; 9016, limit plate; 9021, limit slot; 9022, limit pin; 10, mounting plate; 11, limit rod. DETAILED DESCRIPTION

[0030] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is to enable those skilled in the art to better understand and implement the subject matter described herein. The functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the present specification. Various examples may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0031] Embodiment 1:

[0032] See also Figure 1 and Figure 3 In this embodiment, a wheel rim lubrication nozzle air tightness test device is proposed, including a test frame 1, a test water pool 2 fixedly installed on the bottom inner wall of the test frame 1, and a support plate 3 fixedly installed on the inner wall of the test frame 1 and located above the test water pool 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 slides through the support plate 3 and is provided with a lifting part 5.

[0033] See also Figure 1 , Figure 2 and Figure 3The lifting part 5 includes a lifting plate 501 fixedly installed at the output end of the driving member 4, a plurality of lifting guide columns 502 fixedly installed at the bottom of the lifting plate 501 and distributed in a circle, a plurality of limit rods 11 sliding through the support plate 3 and distributed in a rectangular shape are fixedly installed on the top of the lifting plate 501, a bearing platform 503 for bearing the air tightness test of the lubrication nozzle 6 is commonly installed at the bottom ends of the plurality of lifting guide columns 502, a mounting plate 10 is commonly installed on the outer sides of the plurality of lifting guide columns 502, and a test unit 7 for performing air tightness test on the lubrication nozzle 6 under different conditions and a sealing unit 8 for cooperating with the test unit 7 to seal, position and fix the corresponding lubrication nozzle 6 are arranged between the mounting plate 10 and the bearing platform 503.

[0034] It should be noted that before starting the test, a certain amount of clean water is injected into the test water pool 2. The amount of water injected needs to be able to cover the lubrication nozzle 6. The driving component 4 adopts a conventional hydraulic cylinder. At the beginning of the test, the output end of the driving component 4 pushes the lifting plate 501 downward, driving the lubrication nozzle 6 on the top of the supporting platform 503 to immerse in the clean water for testing. The limit rod 11 limits and guides the lifting plate 501 when it moves up and down.

[0035] See also Figure 2 , Figure 3 , Figure 4 and Figure 5 The test unit 7 includes a positioning component 701 and a test gas supply pipe 702 arranged in the sealing unit 8 for supplying different gases to the lubrication nozzle 6. A plurality of limiting and locking units 9 distributed in a rectangular shape and corresponding to the sealing unit 8 are arranged between the mounting plate 10 and the test unit 7. When the sealing unit 8 cooperates with the positioning component 701 to seal and position the lubrication nozzle 6, the limiting and locking units 9 limit and lock the lubrication nozzle 6 and the sealing unit 8 in the horizontal and vertical directions.

[0036] It should be noted that there are four test units 7. Before the test starts, the four test gas supply pipes 702 are connected to the external gas supply source. The four test gas supply pipes 702 are respectively connected to the humidity adjustment gas pipeline, the temperature simulation gas pipeline, the impurity simulation gas pipeline and the pressure fluctuation simulation gas pipeline. The pipeline interfaces are sealed with sealants to prevent gas leakage.

[0037] The humidity regulating gas pipeline is connected to the gas output by the humidity regulating module, and the humidity is controlled at 60%-80%RH. It is the gas obtained by adding water vapor to dry air, and is used to simulate the humidity environment in the use environment of the lubrication nozzle.

[0038] The temperature simulation gas pipeline is connected to the gas output by the temperature regulating module. Since the temperature in the use environment will fluctuate with the season and the operation of the equipment, the temperature range is 28-32℃ in summer and 18-22℃ in winter. The temperature of the gas transported by the pipeline will simulate the above actual operating temperature.

[0039] The impurity-containing simulated gas pipeline is connected to the gas output by the impurity adding module. This gas is added with simulated dust particles such as silicon dioxide and iron oxide based on 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, which can simulate the air environment containing impurities in the use environment.

[0040] The pressure fluctuation simulation gas pipeline is connected to the gas delivery pipeline equipped with a pressure fluctuation generator. The output gas simulation pressure is 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 lubrication nozzle is subjected to under different circumstances.

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

[0042] The temperature and humidity adjustment module, impurity addition module, pressure fluctuation generator, pressure sensor, temperature sensor, humidity sensor and impurity concentration sensor used in the test process are common knowledge to those skilled in the art, and therefore will not be described in detail in this application.

[0043] Before starting the test, the lubrication nozzle 6 is fixed by the positioning component 701, and then the lubrication nozzle 6 is sealed, positioned and fixed by the sealing unit 8, and then the support platform 503 is controlled to move downward, and the lubrication nozzle 6 on its top is immersed in clean water. After waiting for the water flow to stabilize and stop, the test is started: first, the temperature, humidity, pressure and gas impurity concentration parameters inside the four lubrication nozzles 6 in the initial state are measured by sensors respectively, and then the air source module, humidity adjustment module, impurity addition module and pressure fluctuation generator are turned on in turn, and the four gases in the simulated use environment enter the lubrication nozzle 6 through the test air supply pipeline 702 respectively. Then, the changes of various factors and the air tightness of the lubrication nozzle 6 are continuously monitored. Every 15 minutes, the simulated environment parameters are adjusted in time, and the pressure fluctuation frequency and amplitude are changed by the pressure fluctuation generator. When simulating the use environment in different seasons, the temperature adjustment module is adjusted to set the temperature and the humidity adjustment module is adjusted to set the humidity.

[0044] During the test, the water surface conditions at the positions of the lubrication nozzles 6 in the test pool 2 are continuously observed through a high-definition camera. When a lubrication nozzle 6 leaks, bubbles will appear in the water at its position. Once bubbles are found, it means that the lubrication nozzle 6 is leaking. The leakage time of the lubrication nozzle 6 is immediately recorded, and the leakage point is determined according to the position of the bubbles. Finally, until all the lubrication nozzles 6 leak, the leakage time and leakage point of the four lubrication nozzles 6 are recorded. According to the situation that all the lubrication nozzles 6 leak, the overall tolerance limit of the lubrication nozzle 6 under the specific simulated working conditions is understood, that is, the approximate time range for which the lubrication nozzle 6 can remain sealed under the conditions of pressure, humidity, temperature or impure gas is understood, and direction is provided for the overall design optimization of the lubrication nozzle, such as adjusting the sealing material, improving the structural shape, etc.

[0045] See also Figure 2 , Figure 4 , Figure 5 and Figure 6 The positioning assembly 701 includes a positioning back plate 7011 fixedly mounted on the top of the carrier platform 503 and two positioning blocking rods 7012 fixedly mounted on the top of the carrier platform 503 and symmetrical to each other.

[0046] See also Figure 4 , Figure 5 and Figure 6 Before starting the test, the lubrication nozzle 6 is placed against the positioning back plate 7011 and the two side opening pipes of the lubrication nozzle 6 are placed between the two positioning bars 7012. The positioning back plate 7011 provides a fixed reference surface for the lubrication nozzle 6 in the horizontal direction. The positioning bars 7012 limit the circumferential rotation of the lubrication nozzle 6, so that the lubrication nozzle 6 is fixed between the positioning bars 7012 and cannot rotate, so as to position the lubrication nozzle 6.

[0047] See also 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 platform 503 and corresponding to the plurality 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 mounted on the top of the mounting plate 10 and a driving plate 8023 fixedly mounted on the output end of the driving cylinder 8022. A movable plate 8024 is fixedly mounted on the bottom of the driving plate 8023 through a plurality of buffer springs 8025 distributed in a rectangular shape. The buffer springs 8025 are sleeved on the outer side of the corresponding lifting guide column 502.

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

[0049] See also Figure 3 , Figure 4 , Figure 5 and Figure 6 The movable sealing assembly 801 includes a slide groove 8011 opened on the top of the supporting platform 503 and a slider 8012 slidably installed in the slide groove 8011, and a return spring 8016 is installed between the inner wall of the slide groove 8011 away from the center of the supporting platform 503 and the slider 8012. A wedge plate 8013 is fixedly installed on the top of the slider 8012, and a side sealing head 8014 for sealing the two side opening pipes of the lubrication nozzle 6 is fixedly installed on the side of the wedge plate 8013 close to the lubrication nozzle 6, and an upper sealing head 8015 for sealing the top oil injection port of the lubrication nozzle 6 is fixedly installed on the bottom of the movable plate 8024.

[0050] See also Figure 4 , Figure 5 and Figure 6 The test air supply pipe 702 is fixedly installed in the wedge plate 8013 through the installation groove opened in the wedge plate 8013, and the side sealing head 8014 is connected to the test air supply pipe 702 at the joint of the side opening pipe located above, so as to supply air to the lubrication nozzle 6 during the test.

[0051] See also Figure 3 , Figure 4 , Figure 5 and Figure 6 The sealing drive assembly 802 also includes an extrusion cone 8021 fixedly installed at the bottom center of the movable plate 8024 and used to extrude 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 sealing head 8014 to move and seal the two side opening pipes of the lubrication nozzle 6.

[0052] See also Figure 4 , Figure 5 and Figure 6Before starting the test, the lubrication nozzle 6 needs to be sealed and further positioned and fixed. Specifically, the driving cylinder 8022 is started. The output end of the driving cylinder 8022 pushes the driving plate 8023 to move downward, which will synchronously drive the moving plate 8024 to move downward through the buffer spring 8025, so that the upper sealing head 8015 gradually approaches the top oil injection port of the lubrication 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 lubrication nozzle 6 through the wedge plate 8013. The two side opening pipes, until the side sealing head 8014 is close to the two side opening pipes and the upper sealing head 8015 is close to the top oil injection port of the lubrication nozzle 6, thereby completing the sealing of the lubrication nozzle 6, and at this time, the side sealing head 8014 presses the lubrication nozzle 6 onto the positioning back plate 7011, to achieve further positioning and fixation of the lubrication nozzle 6 in the horizontal direction, and the upper sealing head 8015 presses the lubrication nozzle 6 onto the top of the supporting platform 503, to achieve further positioning and fixation of the lubrication nozzle 6 in the vertical direction, thereby achieving all-round fixation of the lubrication nozzle 6.

[0053] See also Figure 4 , Figure 5 and Figure 6 The limiting and locking unit 9 includes a vertical limiting component 901 arranged at the bottom of the movable plate 8024 and used for limiting the movable sealing component 801 in the vertical direction, and a horizontal locking component 902 used for locking the movable sealing component 801 in the horizontal direction. The vertical limiting component 901 includes a connecting plate 9011 fixedly installed at the bottom of the movable plate 8024, a reset sleeve 9013 is fixedly installed on the connecting plate 9011 near the center of the bearing platform 503 through a reset spring 9012, a locking rod 9014 sliding through the connecting plate 9011 is fixedly installed in the reset sleeve 9013, a locking groove 9015 matching the locking rod 9014 is provided on the side of the positioning back plate 7011 near the locking rod 9014, a limiting plate 9016 is fixedly installed on the side of the locking rod 9014 away from the center of the bearing platform 503, and the limiting plate 9016 conflicts with the connecting plate 9011 when the reset spring 9012 is in a natural state.

[0054] See also Figure 4 , Figure 5 and Figure 6 The horizontal locking assembly 902 includes a limiting slot 9021 which is opened on the top of the limiting plate 9016 and vertically passes through the limiting plate 9016. A limiting pin 9022 which slides through the moving plate 8024 and cooperates with the limiting 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 limiting pin 9022 is inserted into the limiting slot 9021 to lock the locking rod 9014, so as to lock the movable 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 away from the center of the supporting platform 503. When the locking rod 9014 moves downward, the slope will be squeezed, so that the locking rod 9014 moves toward the side close to the connecting plate 9011 and can finally be stuck in the locking groove 9015.

[0056] The deformation of the buffer spring 8025 during the process of sealing, positioning and fixing the lubrication nozzle 6 will not cause the movable plate 8024 to move downward excessively, so that the limit pin 9022 will squeeze the limit plate 9016 before being 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 completing the sealing, positioning and fixing of the lubrication nozzle 6, thereby locking the locking rod 9014 and further locking the movable sealing assembly 801 in the horizontal direction.

[0057] See also Figure 4 , Figure 5 and Figure 6 In the process that the driving plate 8023 drives the movable plate 8024 to move downward to drive the movable sealing assembly 801 to seal and fix the lubrication nozzle 6, the connecting plate 9011 will also move downward synchronously, driving the locking rod 9014 to move downward and squeeze the inclined surface at the top of the positioning back plate 7011, so that the locking rod 9014 moves toward the side close to the connecting plate 9011, and then continues to move with the connecting plate 9011. The locking rod 9014 moves through the inclined surface transition to the side of the positioning back plate 7011 away from the center of the supporting platform 503, and finally gets stuck in the locking groove 9015.

[0058] When the locking rod 9014 is inserted into the locking groove 9015, it means that the upper sealing head 8015 and the side sealing head 8014 have just completed the sealing positioning and fixation of the lubrication nozzle 6, avoiding deformation of the lubrication nozzle 6 caused by excessive extrusion. At the same time, the locking rod 9014 is inserted into the locking groove 9015 to lock and limit the vertical direction of the movable plate 8024. Then, the driving plate 8023 continues to move and cannot continue to push the movable plate 8024 downward (because the locking rod 9014 is inserted into the locking groove 9015 at this time). The driving plate 8023 continues to move downward and will continue to compress the buffer spring 8025 and drive The limit pin 9022 moves downward, and finally the limit pin 9022 is inserted into the limit slot 9021, locking the locking rod 9014 in the horizontal direction, thereby realizing multi-level locking and limiting of the movable plate 8024, avoiding the movable plate 8024 from moving under water pressure or buoyancy after entering the test water pool 2, thereby ensuring the stability of the extrusion cone 8021, avoiding the loosening of the extrusion cone 8021 and causing the loosening of the sealing positioning of the lubrication nozzle 6, greatly improving the sealing positioning and fixing stability of the lubrication nozzle 6, and directly improving the stability of the airtightness test, making the test results more accurate.

[0059] Embodiment 2:

[0060] This embodiment is an improvement on the first embodiment, and the difference lies in that: on the basis of the existing lubrication nozzle test group, a lubrication nozzle test group is additionally provided, and then a total mixed gas pipeline is installed, and the output ends of the humidity adjustment module, the temperature adjustment module, the impurity addition module and the pressure fluctuation generator are connected to the total mixed gas pipeline through respective independent branch pipelines, and a flow regulating valve and a one-way 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 one-way valve is used to prevent gas backflow, thereby ensuring stable and accurate delivery of the mixed gas.

[0061] During the test, the target parameters of the mixed gas were set, the pressure range was set at 0.8-1.2 standard atmospheres, the humidity was controlled at 60%-80%RH, the temperature simulated 28-32℃ in summer and 18-22℃ in winter, the impurity composition and concentration were based on the actual concentration and particle size distribution of dust particles in the use environment, and silica, iron oxide, etc. were added to simulate dust particles, and the particle size was concentrated in the range of 0.1-10 microns.

[0062] During the test, with other lubrication nozzle tests remaining unchanged, the mixed gas is filled into the lubrication nozzle 6 of the newly added lubrication nozzle test group through the total mixed gas pipeline, and the simulated environmental parameters are adjusted in time every 15 minutes, and the pressure fluctuation frequency and amplitude are changed through the pressure fluctuation generator; when simulating the use environment in different seasons, the temperature setting of the temperature adjustment module and the humidity setting of the humidity adjustment module are adjusted to ensure that the test process can simulate the actual comprehensive working conditions to the greatest extent.

[0063] During the entire test process, the leakage time and leakage point of the newly added lubrication nozzle 6, as well as the pressure, temperature, humidity and impurity concentration change data monitored by the sensor over time are continuously recorded. According to the leakage situation of the newly added lubrication nozzle 6, the overall tolerance limit of the lubrication nozzle 6 under the comprehensive simulated working condition is analyzed, that is, the approximate time range for which the lubrication nozzle 6 can remain sealed under the comprehensive conditions of pressure, humidity, temperature and impurity-containing gas is understood, and the difference in its adaptability to similar actual working conditions is evaluated, providing a more comprehensive and accurate reference basis for the maintenance cycle and service life estimation in actual applications.

[0064] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection 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 air supply pipeline arranged in the sealing unit for supplying different gases to the lubrication nozzle. A plurality of limit locking units distributed in a rectangular shape and corresponding to the sealing unit are arranged between the mounting plate and the test unit. While the sealing unit seals and positions the lubrication nozzle, the limit locking unit limits and locks the lubrication nozzle and the sealing unit in horizontal and vertical directions.

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 sealing unit includes a plurality of movable sealing assemblies which are arranged in a rectangular distribution on the top of the supporting platform and correspond one-to-one to the plurality of test units, and a sealing driving assembly for driving the plurality of movable sealing assemblies to move synchronously to seal the side opening pipes of the corresponding lubrication nozzles. The sealing driving assembly includes a driving cylinder fixedly mounted on the top of the mounting plate and a driving plate fixedly mounted on the output end of the driving cylinder. The bottom of the driving plate is fixedly mounted with the movable plate by a plurality of buffer springs distributed in a rectangular distribution. The buffer springs are sleeved on the outer sides of the corresponding lifting guide columns.

4. The wheel rim lubrication nozzle air tightness test equipment according to claim 3, characterized in that: The movable sealing assembly includes a slide groove opened on the top of the bearing platform and a slider slidably installed in the slide groove, a return spring 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 the 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.

5. The wheel rim lubrication nozzle air tightness test equipment according to claim 4, characterized in that: The sealing drive assembly also includes an extrusion cone which is fixedly mounted at the bottom center of the moving plate and is used for extruding the wedge plate.

6. A wheel rim lubrication nozzle air tightness test equipment according to any one of claims 4-5, 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.

7. The wheel rim lubrication nozzle air tightness test equipment according to claim 3, 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.

8. The wheel rim lubrication nozzle air tightness test equipment according to claim 7, 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.

9. The wheel rim lubrication nozzle air tightness test equipment according to claim 8, 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.

10. 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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