Performance test tool for lip seal ring and test method thereof

Abstract

The application discloses a performance test tool for a lip-shaped sealing ring and a test method thereof, and the tool comprises a driving mechanism, a test shaft, an oil seal sealing structure, a wheel hub and a sliding mechanism; the driving mechanism and the test shaft are coaxially connected; the outer end of the test shaft is fixedly connected with the wheel hub, and the inner end surface of the lip-shaped sealing ring is in transition fit with the outer end surface of the wheel hub; the oil seal sealing structure is fixedly arranged on the outer circumferential surface of the lip-shaped sealing ring, a cavity for containing hydraulic oil is arranged in the oil seal sealing structure, a channel for injecting the hydraulic oil into the cavity is formed in the oil seal sealing structure, and the lip-shaped sealing ring is fixed; and the sliding mechanism is used for causing the lip-shaped sealing ring to be radially offset relative to the test shaft and the wheel hub. The sealing performance and the friction torque of the test shaft and the lip-shaped sealing ring under concentric working conditions and eccentric working conditions are measured under the constant temperature and constant pressure state, the working efficiency is improved, the test requirements in multiple aspects can be met, and the cost is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sealing ring detection tooling, in particular to a performance test tooling for lip-shaped sealing rings and a test method thereof. BACKGROUND

[0002] A sealing element is a kind of component that prevents gas, liquid, and solid from leaking to the outside environment or prevents the outside gas, liquid, and solid from entering the sealed space. A rubber sealing element and a sealing cavity together form a sealing device. Based on the principle of contact sealing, the rubber is compressed and deformed under the action of contact pressure, and the material resilience generates contact pressure on the contact surface, thereby forming contact sealing with the sealing cavity. Offload refers to the deviation or error caused by various factors in actual operation when an ideal perfect working state is preset in industrial product design.

[0003] At present, the method for testing the performance of the sealing ring by changing the offset through the existing test tooling is relatively complex, and it is not convenient to replace the sealing ring to test the sealing performance of sealing rings of different sizes.

[0004] Therefore, there is an urgent need to propose a new solution to solve the above problems. SUMMARY

[0005] The present application provides a performance test tooling for lip-shaped sealing rings and a test method thereof, to solve the problems in the prior art that it is troublesome to change the eccentricity of the rotating shaft, and it is not convenient to replace the sealing ring to test the sealing performance of sealing rings of different sizes.

[0006] The present application provides a performance test tooling for lip-shaped sealing rings, comprising a driving mechanism, a test shaft, an oil seal structure, a hub, and a sliding mechanism.

[0007] The driving mechanism and the test shaft are coaxially connected, and a torque sensor for measuring torque is arranged on the driving mechanism.

[0008] The test shaft is fixedly connected with the hub at the outer end, a space for placing the lip-shaped sealing ring is arranged between the oil seal structure and the hub, and the inner end surface of the lip-shaped sealing ring is in transition fit with the outer end surface of the hub.

[0009] The oil seal structure is fixedly arranged on the outer circumferential surface of the lip-shaped sealing ring, a cavity for containing hydraulic oil is arranged in the oil seal structure, a channel for injecting hydraulic oil into the cavity is formed in the oil seal structure, and the lip-shaped sealing ring is fixed; a temperature sensor and a first pressure sensor for detecting the temperature and pressure of the hydraulic oil, respectively, are arranged on the sealing seat.

[0010] The sliding mechanism is fixedly arranged at the end of the oil seal structure, and the test shaft and the hub are offset relative to the oil seal structure by moving the sliding mechanism.

[0011] Further, the oil seal structure comprises a sealing seat, a sealing sleeve and an oil seal cover arranged from outside to inside, the sealing sleeve is provided with an oil inlet channel for the hydraulic oil to flow into the cavity, and the sealing sleeve and the sealing seat are detachably fixedly connected.

[0012] Further, the side of the sealing seat away from the sealing sleeve is detachably provided with a liquid storage tank, the upper and lower ends of the lip-shaped sealing ring are respectively provided with a first concave part matched with the oil seal cover and a second concave part matched with the hub, and the oil seal cover is in interference fit with the sealing sleeve.

[0013] Further, the side of the hub away from the cavity is provided with a liquid storage tank, the lower end of the liquid storage tank is provided with a leakage guide pipe, and the lower side of the leakage guide pipe is provided with a measuring cup for measuring the leakage amount of the hydraulic oil.

[0014] Further, the sealing seat is provided with an oil supply pipe and an oil return pipe for connecting with an oil tank, the sealing seat is provided with an oil path for conveying the hydraulic oil to the oil inlet channel, the lower end of the sealing seat is fixedly provided with an oil storage box, the first intermediate plate is arranged below the oil storage box, and the oil storage box is provided with an oil discharge pipe.

[0015] Further, the sliding mechanism comprises a sliding table, a sliding rail and an intermediate connecting column, the upper and lower ends of the intermediate connecting column are respectively fixedly connected with the sealing seat and the sliding table, the bottom of the sliding rail is fixedly arranged on the first intermediate plate, and the sliding rail is provided with a track for moving the sliding table.

[0016] Further, the test tool further comprises a high-low temperature box fixedly arranged on the first intermediate plate, the high-low temperature box is used for keeping the temperature of the hydraulic oil constant, the oil in the oil tank enters a forced air cooling oil cooler through a cooling oil return pipe, and then enters a pressure regulator, so that the hydraulic oil reaches a set pressure, and then is conveyed to the cavity through the oil supply pipe, thereby keeping the pressure of the hydraulic oil constant.

[0017] Further, the driving mechanism comprises a first rotating shaft, an intermediate shaft and a second rotating shaft connected with the test shaft in sequence, a first coupling is arranged between the first rotating shaft and the intermediate shaft, a second coupling is arranged between the intermediate shaft and the second rotating shaft, and the torque sensor is arranged on the intermediate shaft.

[0018] The application also provides a testing method of the performance testing tool of the lip-shaped sealing ring, and the testing method for the concentric working condition comprises the following steps: ensuring that the hydraulic oil in the cavity is constant in temperature and pressure, starting a servo motor, the servo motor finally drives the hub and the testing shaft to rotate, when the lip-shaped sealing ring is not sealed well, the liquid in the cavity leaks from the gap between the hub and the lip-shaped sealing ring, enters the liquid storage tank, and finally flows into the measuring cup through the leakage conduit, the sealing performance of the lip-shaped sealing ring 4 is judged according to the leakage amount of the measuring cup 72, and the friction torque between the outer circular surface of the hub and the lip surface of the lip-shaped sealing ring is measured according to the reading of the torque sensor.

[0019] For the eccentric working condition, the following steps are included: ensuring that the hydraulic oil in the cavity is constant in temperature and pressure, adjusting the slide table under the tool to generate a horizontal offset of no more than 0.06 mm along the slide rail, the lip-shaped sealing ring and the oil seal structure move along the slide rail, the hub and the testing shaft remain stationary relative to the first intermediate plate, starting the servo motor, after a period of operation, the sealing performance of the lip-shaped sealing ring is detected by observing the leakage amount in the measuring cup, and the friction torque between the outer circular surface of the hub and the lip surface of the lip-shaped sealing ring is measured according to the reading of the torque sensor.

[0020] Further, the step of ensuring that the hydraulic oil in the cavity is constant in temperature and pressure comprises the following steps:

[0021] The oil temperature of the detection oil is detected by the cold and hot all-in-one machine, the oil is changed, the heat generated by the high-speed rotation of the lip-shaped sealing ring is circulated and dissipated by the cold and hot all-in-one machine, the hydraulic oil pressure in the cavity is kept constant by the stable pressure closed-loop control composed of the first pressure sensor, the internal gear pump and the servo motor;

[0022] The temperature in the cavity is kept in a controllable range by the temperature closed-loop control composed of the temperature sensor and the circulating electromagnetic ball valve, so that the temperature of the hydraulic oil in the cavity is kept constant.

[0023] Compared with the prior art, the application has the following beneficial effects:

[0024] 1、The driving mechanism, the testing shaft, the oil seal structure, the lip-shaped sealing ring, the hub and the sliding mechanism are arranged in cooperation, the temperature sensor and the pressure sensor arranged on the sealing seat are used for detecting the oil temperature and the pressure of the hydraulic oil respectively, so that the sealing performance and the friction torque of the testing shaft and the lip-shaped sealing ring under the concentric working condition and the eccentric working condition under the constant temperature and pressure are measured, the working efficiency is improved, the testing requirements in multiple aspects can be met, and the cost is low.

[0025] 2、The present application sets up the slide and the slide rail that cooperate with each other, and the slide and the sealing seat are fixedly connected, when the slide is moved along the slide rail, the lip seal and the oil seal structure move along with the slide rail, the wheel hub and the test shaft keep still relative to the first intermediate plate, so that the eccentric adjustment of the lip seal is completed, compared with the traditional scheme, it is simple and convenient;

[0026] 3、The present application only needs to disassemble and replace the oil seal cover, the lip seal and the oil seal cover of different sizes, so that the performance test of the lip seal of different sizes can be completed, which is simple and convenient, and can meet the performance test requirements of the lip seals of different sizes;

[0027] 4、The present application also provides a performance test method of the lip seal, which is simple in operation and high in efficiency, the hydraulic oil is circulated and delivered in real time through the cold and hot all-in-one machine, the oil temperature is detected through the temperature sensor, and the oil temperature is controlled through the circulating electromagnetic ball valve, so that the simulation of low-temperature working condition is realized, and the sealing performance of the lip seal under high-temperature working condition is tested. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a three-dimensional schematic view of the partial performance test tool of the lip seal in the first embodiment of the present application;

[0029] Figure 2 It is a longitudinal section view of Figure 1 ;

[0030] Figure 3 It is an enlarged schematic view of A in Figure 2 ;

[0031] Figure 4 It is a front view of the test shaft, the oil seal structure, the lip seal and the wheel hub in the second embodiment of the present application;

[0032] Figure 5 It is a B-B section view of Figure 4 ;

[0033] Figure 6 It is a side view of the overall performance test tool of the lip seal;

[0034] Figure 7 It is a structure view of the sealing seat and the oil storage box of the lip seal;

[0035] Figure 8 It is a structure view of the overall performance test tool of the lip seal with the high and low temperature box;

[0036] Figure 9 It is a circuit principle view of the oil seal structure;

[0037] Figure 10 It is a test value of the performance test tool of the present application.

[0038] Reference numerals: 1. Drive mechanism; 11. First rotating shaft; 12. First coupling; 13. Intermediate shaft; 131. Torque sensor; 14. Second coupling; 15. Second rotating shaft; 16. Servo motor; 17. First bearing housing; 18. Second bearing housing; 19. Third bearing housing; 2. Test shaft; 3. Oil seal structure; 31. Sealing seat; 311. Oil supply pipe; 312. Oil return pipe; 32. Sealing outer sleeve; 321. Oil delivery channel; 33. Oil seal cover; 34. O-ring seal; 35. First level gauge; 36. Handle; 37. Temperature sensor; 38. First pressure sensor; 39. Cavity; 4. Lip seal; 5. Hub; 6. Sliding mechanism; 61. Slide table; 62. Slide rail; 63. 7. Intermediate connecting column; 71. Liquid storage tank; 72. Leakage conduit; 83. Measuring cup; 84. Oil storage box; 85. Oil drain pipe; 86. Cooling unit; 87. Power unit; 88. First intermediate plate; 89. Second intermediate plate; 80. High and low temperature chamber; 91. Oil tank; 912. Second liquid level gauge; 913. Air filter; 914. Liquid level relay; 925. Oil filter; 926. Internal gear pump; 927. Servo motor; 938. Overflow valve; 939. Throttle valve; 930. Check valve; 931. Pressure sensor switch; 932. Pressure sensor; 933. Second pressure sensor; 94. Integrated cooling and heating unit; 951. Second pressure sensor; 96. High-pressure ball valve; 97. Circulation solenoid ball valve. Detailed Implementation

[0039] To further understand the invention's content, features, and effects, the following embodiments are provided, along with accompanying drawings. Figures 1-10 The details are as follows.

[0040] like Figures 1-8 As shown, the present invention provides a performance testing fixture for lip seals, including a drive mechanism 1, a test shaft 2, an oil seal structure 3, a hub 5, and a sliding mechanism 6;

[0041] The aforementioned drive mechanism 1 and test shaft 2 are coaxially connected, and the aforementioned drive mechanism 1 is equipped with a torque sensor 131 for measuring torque;

[0042] The outer end of the test shaft 2 is fixedly connected to a hub 5, and a space for placing a lip seal ring 4 is provided between the oil seal structure 3 and the hub 5. The inner end face of the lip seal ring 4 is transitionally fitted with the outer end face of the hub 5.

[0043] The oil seal structure 3 is fixedly arranged on the outer circumferential surface of the lip seal ring 4, the oil seal structure 3 is internally provided with a cavity 39 for accommodating hydraulic oil, and a channel for injecting hydraulic oil into the cavity 39 is formed on the oil seal structure 3; the sealing seat 31 is provided with a temperature sensor 37 and a first pressure sensor 38 for detecting the oil temperature and pressure of the hydraulic oil, respectively;

[0044] The sliding mechanism 6 is fixedly arranged at the lower end of the oil seal structure 3, and the test shaft 2 and the hub 5 are offset relative to the oil seal structure 3 by moving the sliding mechanism 6.

[0045] The present application sets up the driving mechanism, the test shaft, the oil seal structure, the lip seal ring, the hub and the sliding mechanism which cooperate with each other, and sets up the temperature sensor and the pressure sensor on the sealing seat for detecting the oil temperature and pressure of the hydraulic oil, respectively, so as to test the reliability performance of the rotating lip seal ring product under the concentric condition and the eccentric condition of the test shaft and the lip seal ring, and collect the wide range of feedback sensor data, wherein the data includes torque, pressure and temperature and the like, thereby improving the work efficiency, meeting the test requirements in many aspects, and reducing the cost.

[0046] In the embodiment, as shown in Figures 2-5 The oil seal structure 3 comprises a sealing seat 31, a sealing sleeve 32 and an oil seal cover 33 arranged from outside to inside in sequence, an oil conveying channel 321 for flowing the hydraulic oil into the cavity 39 is formed in the sealing sleeve 32, the sealing sleeve 32 and the sealing seat 31 are detachably fixedly connected, a liquid storage tank 7 is detachably arranged on the side of the sealing seat 31 away from the sealing sleeve 32, first and second recesses are respectively formed at the upper and lower ends of the lip seal ring 4 and are matched with the oil seal cover 33 and the hub 5, and the oil seal cover 33 is in interference fit with the sealing sleeve 32. Specifically, the oil seal cover 33 is connected to the sealing sleeve 32 by a plurality of bolts, the sealing sleeve 32 is connected to the sealing seat 31 by a plurality of bolts, and the liquid storage tank 7 is also connected to the sealing seat 31 by a plurality of bolts. As shown in Figures 4-6 The oil seal structure 3 further comprises a plurality of O-shaped sealing rings 34, a first liquid level meter 35 and handles 36, the first liquid level meter 35 can measure the oil surface height of the hydraulic oil in the cavity 39, the two handles 36 are fixedly arranged on the outer end surface of the sealing sleeve 32 by bolts, so as to facilitate the disassembly and assembly of the sealing sleeve 32, and the O-shaped sealing rings 34 are arranged at the bolt connection positions of the components to achieve the sealing and fastening effect.

[0047] In the embodiment, as shown in Figure 2 and 3As shown in the figure, the hub 5 is provided with a liquid tank 7 on the side away from the cavity 39, and the lower end of the liquid tank 7 is provided with a leakage conduit 71, and the lower side of the leakage conduit 71 is provided with a measuring cup 72 for measuring the leakage amount of hydraulic oil. The sealing performance of the lip-shaped sealing ring 4 is judged by the leakage amount of the measuring cup 72.

[0048] As shown in the figure, Figure 1 and 7 As shown in the figure, the sealing seat 31 is provided with an oil supply pipe 311 and an oil return pipe 312 for connecting with the oil tank, and the sealing seat 31 is provided with an oil path for delivering hydraulic oil to the oil supply channel 321, and the lower end of the sealing seat 31 is fixedly welded with an oil storage box 81, and the first intermediate plate 84 is arranged below the oil storage box 81, and the oil storage box 81 is provided with an oil discharge pipe 811. When the oil seal is disassembled, the oil return pipe 312 cannot completely discharge the hydraulic oil in the cavity 39 to the outside. When the tool is disassembled, the hydraulic oil is completely leaked out, flows onto the sealing seat 31 through the hole, flows into the oil storage box 81, and finally flows into the oil tank through the oil discharge pipe 811. The oil discharge pipe 811 is used for discharging oil when replacing the lip-shaped sealing ring.

[0049] The replacement of the lip-shaped sealing ring 4 of different sizes includes the following steps: the fasteners on the oil seal cover 33 are removed to separate the oil seal cover 33 and the sealing sleeve 32, the oil seal cover 33 and the lip-shaped sealing ring 4 are removed, the hub 5 is removed, the new oil seal cover 33, the lip-shaped sealing ring 4 and the hub 5 are replaced, the lip-shaped sealing ring 4 and the hub 5 are transitionally matched, the oil seal cover 33 and the lip-shaped sealing ring 4 are interference matched, and the oil seal cover 33 and the sealing sleeve 32 are connected together by the fasteners. Among them Figure 2 and Figure 4 The replacement of the lip-shaped sealing ring 4 of different sizes includes the following steps: the fasteners on the oil seal cover 33 are removed to separate the oil seal cover 33 and the sealing sleeve 32, the oil seal cover 33 and the lip-shaped sealing ring 4 are removed, the hub 5 is removed, the new oil seal cover 33, the lip-shaped sealing ring 4 and the hub 5 are replaced, the lip-shaped sealing ring 4 and the hub 5 are transitionally matched, the oil seal cover 33 and the lip-shaped sealing ring 4 are interference matched, and the oil seal cover 33 and the sealing sleeve 32 are connected together by the fasteners. Among them

[0050] As shown in the figure, Figure 1 The sliding mechanism 6 includes a sliding table 61, a sliding rail 62 and an intermediate connecting column 63, the upper and lower ends of the intermediate connecting column 63 are fixedly connected with the sealing seat 31 and the sliding table 61 respectively, the bottom of the sliding rail 62 is fixedly arranged on the first intermediate plate 84, and the sliding rail 62 is provided with a track for moving the sliding table 61. The sliding table and the sliding rail are matched, and the sliding table and the sealing seat are fixedly connected. When the sliding table is moved along the sliding rail, the lip-shaped sealing ring and the oil seal structure move together with the sliding rail, the hub and the test shaft remain stationary relative to the first intermediate plate, thereby completing the eccentric adjustment of the lip-shaped sealing ring. Compared with the traditional scheme, it is simple and convenient, and the horizontal offset is not more than 0.06mm, and the displacement amount is very small, so the corresponding pipeline does not need to be disassembled.

[0051] In the embodiment, as shown in Figure 6 The second intermediate plate 85 is provided below the first intermediate plate 84, and the cooling unit 82 and the power unit 83 are arranged on the second intermediate plate 85, wherein the cooling unit 82 is a cooling unit of a hydraulic power source, and the power unit 83 includes a servo motor 923.

[0052] In the embodiment, as shown in Figure 8 The test tool further includes a high-low temperature box 86 fixedly arranged on the first intermediate plate 84, and the high-low temperature box 86 is used to ensure that the temperature of the hydraulic oil is constant. The oil in the oil tank enters a forced air oil cooler through a cooling return oil pipe, and then enters a pressure regulator, so that the hydraulic oil reaches a set pressure, and is then delivered to the cavity 39 through the oil supply pipe 311, thereby ensuring that the pressure of the hydraulic oil is constant.

[0053] In the embodiment, as shown in Figure 2 The driving mechanism 1 includes the first rotating shaft 11, the intermediate shaft 13 and the second rotating shaft 15 connected in sequence with the test shaft 2. The first coupling 12 is arranged between the first rotating shaft 11 and the intermediate shaft 13, the second coupling 14 is arranged between the intermediate shaft 13 and the second rotating shaft 15, and the torque sensor 131 is arranged on the intermediate shaft 13. In addition, the first rotating shaft 11, the intermediate shaft 13 and the second rotating shaft 15 are respectively sleeved with the first bearing seat 17, the second bearing seat 18 and the third bearing seat 19, and the lower ends of the three bearing seats are fixedly arranged on the first intermediate plate 84.

[0054] The application further provides a test method of the performance test tool of the lip seal ring, which includes ensuring that the hydraulic oil in the cavity 39 is constant in temperature and pressure, and testing the sealing performance and the friction torque of the test shaft 2 and the lip seal ring 4 under concentric and eccentric working conditions, wherein:

[0055] For the concentric working condition, the hydraulic oil in the cavity is ensured to be constant in temperature and pressure, the servo motor 16 is started, the servo motor 16 finally drives the hub 5 and the test shaft 2 to rotate together, when the lip seal ring 4 is not sealed well, the liquid in the cavity 39 leaks out from the gap between the hub 5 and the lip seal ring 4, enters the liquid storage tank 7, and then flows into the measuring cup 72 through the leakage guide pipe 71, and the sealing performance of the lip seal ring 4 is determined according to the leakage amount of the measuring cup 72; and the friction torque between the outer circular surface of the hub 5 and the lip surface of the lip seal ring 4 is measured according to the reading of the torque sensor 131.

[0056] For eccentric working condition, ensure the constant temperature and pressure of the hydraulic oil in the cavity, by adjusting the horizontal offset of the slide 61 under the tool along the slide rail 62, the lip seal ring 4 and the oil seal structure 3 move along with the slide rail 62, the hub 5 and the test shaft 2 remain stationary relative to the first intermediate plate 84, start the servo motor 16, after a period of operation, observe the leakage in the measuring cup 72, detect the sealing performance of the lip seal ring 4, and then measure the friction torque between the outer surface of the hub 5 and the lip surface of the lip seal ring 4 through the reading of the torque sensor 131.

[0057] In the embodiment, as shown in the figure, Figure 9 The above-mentioned ensuring the constant temperature and pressure of the hydraulic oil in the cavity 39 includes the following steps:

[0058] The cold and hot all-in-one machine 94 is used to complete the detection of the oil temperature of the hydraulic oil, the oil change, and the heat generated by the high-speed rotation of the lip seal ring 4 is circulated and dissipated, and the steady-state pressure closed loop control composed of the first pressure sensor 38, the internal gear pump 922 and the servo motor 923 is used to keep the hydraulic oil pressure in the cavity 39 constant;

[0059] The temperature closed loop control composed of the temperature sensor 37 and the circulating electromagnetic ball valve 97 is used to make the temperature in the cavity 39 within a controllable range, so as to ensure the constant temperature of the hydraulic oil in the cavity 39 and circulate and dissipate the heat generated by the high-speed rotation of the lip seal ring 4 in time.

[0060] The second pressure sensor 936 is used to test the pressure of the hydraulic oil in the cavity 39, and the second pressure sensor 951 is used to test the pressure of the oil entering the cavity 39.

[0061] The specific working process is: the oil is discharged into the cavity 39 through the cold and hot inlet, and the pressure sensor connected with the pressure measuring part displays on the upper computer HMI. The first temperature sensor 38 tests the temperature in the cavity 39, and the circulating electromagnetic ball valve 97 is responsible for controlling the oil temperature, and in time, the high-temperature oil is discharged, the low-temperature oil is introduced, and then the hydraulic circuit is used to cool the high-temperature oil, forming a circulating loop, realizing the simulation of high-temperature working condition, and testing the sealing performance of the lip seal ring 4. Figure 10 A set of experimental values of the performance test tool of the present application can show that the device of the present application can complete the leakage performance test of the sealing ring under a specific working condition. The performance test method of the lip seal ring proposed by the present application is simple to operate and has high efficiency. The temperature of the tool environment chamber is stabilized at the preset temperature by the cold and hot all-in-one machine, the heat generated by the friction of the lip seal ring during high-speed and high-pressure rotation is controlled by the temperature sensor and the circulating electromagnetic ball valve to keep the oil temperature at the preset temperature, so as to realize the simulation of low-temperature working condition and test the sealing performance of the lip seal ring under low-temperature working condition.

[0062] The above-mentioned application only expresses the implementation of the embodiment of the application, and cannot be understood as the limitation of the scope of the patent application, nor any form of limitation on the structure of the embodiment of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the embodiment of the application, a number of changes and improvements can be made, which are within the scope of protection of the embodiment of the application.

Claims

1. A performance testing fixture for a lip seal ring, characterized in that: It includes a drive mechanism (1), a test shaft (2), an oil seal structure (3), a hub (5), and a sliding mechanism (6); The drive mechanism (1) and the test shaft (2) are coaxially connected, and a torque sensor (131) for measuring torque is provided on the drive mechanism (1); The outer end of the test shaft (2) is fixedly connected to a hub (5). A space for placing a lip seal (4) is provided between the oil seal structure (3) and the hub (5). The inner end face of the lip seal (4) is transitionally fitted with the outer end face of the hub (5). The oil seal sealing structure (3) is fixedly installed on the outer circumferential surface of the lip seal ring (4). The oil seal sealing structure (3) has a cavity (39) for accommodating hydraulic oil. The oil seal sealing structure (3) has a channel for injecting hydraulic oil into the cavity (39) and fixes the lip seal ring (4). The oil seal sealing structure (3) includes a sealing seat (31), a sealing outer sleeve (32), and an oil seal cover (33) arranged sequentially from the outside to the inside. The sealing outer sleeve (32) has an oil delivery channel (321) for hydraulic oil to flow into the cavity (39). The sealing sleeve (32) and the sealing seat (31) are detachably fixedly connected; the sealing seat (31) is provided with a temperature sensor (37) and a first pressure sensor (38) for detecting the temperature and pressure of hydraulic oil respectively; a liquid storage tank (7) is detachably provided on the side of the sealing seat (31) away from the sealing sleeve (32); the upper and lower ends of the lip seal ring (4) are respectively provided with a first recess that mates with the oil seal cover (33) and a second recess that mates with the wheel hub (5); the oil seal cover (33) and the sealing sleeve (32) are interference fit; The sliding mechanism (6) is fixedly installed at the end of the oil seal structure (3). By moving the sliding mechanism (6), the test shaft (2) and the hub (5) are offset relative to the oil seal structure (3).

2. The performance testing fixture for a lip seal ring according to claim 1, characterized in that: A liquid storage tank (7) is provided on the side of the hub (5) away from the cavity (39). A leakage conduit (71) is provided at the lower end of the liquid storage tank (7). A measuring cup (72) for measuring the amount of hydraulic oil leakage is provided below the leakage conduit (71).

3. The performance testing fixture for a lip seal ring according to claim 2, characterized in that: The sealing seat (31) is provided with an oil supply pipe (311) and an oil return pipe (312) for connecting to the oil tank. The sealing seat (31) is provided with an oil passage for supplying hydraulic oil to the oil delivery channel (321). An oil storage box (81) is fixedly provided at the lower end of the sealing seat (31). A first intermediate plate (84) is provided below the oil storage box (81). An oil drain pipe (811) is provided on the oil storage box (81).

4. The performance testing fixture for a lip seal ring according to claim 1, characterized in that: The sliding mechanism (6) includes a slide table (61), a slide rail (62) and an intermediate connecting column (63). The upper and lower ends of the intermediate connecting column (63) are respectively fixedly connected to a sealing seat (31) and the slide table (61). The bottom of the slide rail (62) is fixedly mounted on the first intermediate plate (84). The slide rail (62) is provided with a track for the slide table (61) to move.

5. The performance testing fixture for a lip seal ring according to claim 3, characterized in that: The test fixture also includes a high and low temperature chamber fixedly installed on the first intermediate plate (84). The high and low temperature chamber is used to ensure that the temperature of the hydraulic oil is constant. The oil in the tank enters the air-cooled oil cooler through the cooling return oil pipe, and then is input into the pressure regulator so that the hydraulic oil reaches the set pressure. Then it is delivered to the cavity (39) through the oil supply pipe (311) to ensure that the pressure of the hydraulic oil is constant.

6. The performance testing fixture for a lip seal ring according to claim 1, characterized in that: The drive mechanism (1) includes a first rotating shaft (11), an intermediate shaft (13), and a second rotating shaft (15) connected in sequence to the test shaft (2). A first coupling (12) is provided between the first rotating shaft (11) and the intermediate shaft (13), and a second coupling (14) is provided between the intermediate shaft (13) and the second rotating shaft (15). The torque sensor (131) is provided on the intermediate shaft (13).

7. A testing method using a performance testing fixture for lip seals as described in any one of claims 1 to 6, characterized in that: For concentric working conditions, the following steps are included: ensuring constant temperature and pressure of hydraulic oil in cavity (39), starting servo motor (16), the servo motor (16) ultimately drives hub (5) and test shaft (2) to rotate together. When the lip seal (4) is not sealed well, the liquid in cavity (39) will leak out from the gap between hub (5) and lip seal (4), enter the storage tank (7), and then flow into measuring cup (72) through leakage conduit (71). The leakage amount of measuring cup 72 is used to judge the sealing performance of lip seal 4, and the reading of torque sensor (131) is used to measure the friction torque between the outer circle surface of hub (5) and lip surface of lip seal (4). For eccentric working conditions, the following steps are included: ensure that the hydraulic oil in the cavity (39) is kept at a constant temperature and pressure, adjust the slide table (61) under the tooling to produce a horizontal offset of no more than 0.06mm along the slide rail (62), the lip seal (4) and the oil seal structure (3) move together with the slide rail (62), the hub (5) and the test shaft (2) remain stationary relative to the first intermediate plate (84), start the servo motor (16), and after running for a period of time, observe the leakage in the measuring cup (72) to detect the sealing performance of the lip seal (4), and then measure the friction torque between the outer surface of the hub (5) and the lip surface of the lip seal (4) by the reading of the torque sensor (131).

8. The performance testing method for a lip seal ring according to claim 7, characterized in that, The process of ensuring constant temperature and pressure of the hydraulic oil in the cavity (39) includes the following steps: The hydraulic oil temperature is detected by the integrated cooling and heating machine (94), the oil is changed, and the heat generated by the high-speed rotation of the lip seal (4) is circulated and dissipated through the integrated cooling and heating machine (94). The hydraulic oil pressure in the cavity (39) is kept constant by a steady-state pressure closed-loop control composed of the first pressure sensor (38), the internal gear pump (922) and the servo motor (923). Then, by forming a closed-loop temperature control system with temperature sensor (37) and circulating solenoid ball valve (97), the temperature inside cavity (39) is kept within a controllable range, thereby ensuring that the temperature of hydraulic oil inside cavity (39) remains constant.

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