A device and method for testing oil seal friction torque

Abstract

The present invention relates to the field of sealing technology, and discloses a test device for oil seal friction torque, including a support frame, a linear guide rail, a connecting frame, a driving device, an input shaft, a torque sensor, an output shaft, an oil seal seat, an oil tank and a thrust unit; the driving device is connected to one end of the input shaft, the other end of the input shaft is connected to the torque sensor, the torque sensor is connected to one end of the output shaft, and the other end of the output shaft is used to install the tested oil seal; the linear guide rail and the oil tank are sequentially arranged on the support frame, the driving device is arranged on the connecting frame, the thrust unit is respectively connected to the connecting frame and the linear guide rail, and the thrust unit can push the connecting frame to move horizontally on the linear guide rail. The beneficial effects of the present invention are: the friction torque and temperature rise of the oil seal during the rotation process can be accurately detected, and support is provided for the selection of the oil seal, the design of the connection structure and the optimization of the process parameters.

Description

Technical Field

[0001] The invention relates to the technical field of sealing, and in particular to a testing device and method for oil seal friction torque. Background Art

[0002] Oil seals are widely used in the mainframes of engineering machinery (rotary drilling rig power head, road roller vibrating wheel, dust suppression vehicle fan output shaft, etc.) and core components (drive axles, gearboxes, hydraulic pump motor input / output shafts), and are used to seal hydraulic oil, lubricating oil and other media. During operation, if the friction torque between the oil seal and the shaft contact surface is too large, the oil seal is prone to wear and thermal aging, resulting in oil leakage. If the friction torque is too low, the oil seal and the shaft are not in close contact, resulting in oil leakage. Severe oil leakage will cause insufficient lubrication of the mainframe and core components, resulting in abnormal noise, wear and other failures of gears, bearings and other parts, affecting the reliability of the whole machine and core components. Detecting and analyzing the friction torque and temperature of the oil seal after assembly is of great significance to improving the reliability of the oil seal connection.

[0003] At present, there are few public reports and literature on the detection of oil seal friction torque. China has carried out some technical research on the measurement of oil seal friction torque in the fields of automobile, chemical industry, aerospace, etc., and has achieved certain research results, mainly including the following patents:

[0004] (1) Invention patent application CN112729715A discloses a valve oil seal test device and test method thereof, which can simulate the actual working conditions of the engine to verify the test oil seal. At the same time, a collection chamber with a closed inner cavity is used to uniformly establish negative pressure, so that each test oil seal faces the same positive and negative pressure environment, thereby realizing the detection of oil seal leakage; however, it cannot realize the detection of friction torque and temperature of the oil seal during rotation.

[0005] (2) Invention patent application CN106500973A discloses a rotary rubber oil seal testing machine, which is suitable for testing the wear resistance of oil seals of different materials and types. The wear resistance of oil seals under different pressures can be tested by changing the sealing pressure. However, it cannot detect the friction torque and temperature of the oil seal during rotation.

[0006] (3) Invention patent application CN111189567A discloses a test bench for measuring the friction torque of oil seals. By testing the pressure value of the pressure block on the pressure sensor, the force value measured by the pressure sensor is multiplied by the vertical distance from the pressure sensor to the rear axle axis to obtain the friction torque of the oil seal. The relative positions of the sensor and the pressure block relative to the oil seal need to be adjusted to achieve the friction torque test under forward and reverse rotation. However, the friction torque value is obtained through indirect measurement and calculation, and the test error is large; the test process needs to adjust the installation position of the sensor and the pressure block, and the test process is complicated. Summary of the invention

[0007] In view of the problems in the prior art, the present invention provides a testing device and method for the friction torque of an oil seal, which has a simpler structure, is easier to implement, has low cost, is convenient to adjust, and has flexible detection action.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] In the first aspect, the present invention proposes a test device for oil seal friction torque, comprising a support frame, a linear guide rail, a connecting frame, a driving device, an input shaft, a torque sensor, an output shaft, an oil seal seat, an oil tank and a thrust unit; the driving device is connected to one end of the input shaft, the other end of the input shaft is connected to the torque sensor, the torque sensor is connected to one end of the output shaft, and the other end of the output shaft is used to install the tested oil seal; the linear guide rail and the oil tank are sequentially arranged on the support frame, the driving device is arranged on the connecting frame, the thrust unit is respectively connected to the connecting frame and the linear guide rail, the thrust unit can push the connecting frame to move horizontally on the linear guide rail, and then the connecting frame drives the driving device, the input shaft, the torque sensor and the output shaft to move horizontally; the oil seal seat is arranged on the oil tank, and the oil seal seat matches the tested oil seal. The torque sensor is arranged between the input shaft and the output shaft, and is used to detect the torque of the output shaft and the input shaft.

[0010] In combination with the first aspect, further, the thrust unit includes an electric cylinder, a connecting shaft, a connecting block and a slider; one end of the connecting shaft is connected to the electric cylinder, and the other end is connected to the connecting block; the connecting block is connected to the slider; the slider is matched with the linear guide rail, the slider can move horizontally and linearly on the linear guide rail, and the slider is also connected to the connecting frame. The power of the electric cylinder drives the slider to move horizontally and linearly on the linear guide rail through the connecting shaft and the connecting block in turn; while the slider moves, it drives the connecting frame connected thereto to move horizontally and linearly, thereby driving the motor arranged on the connecting frame, the input shaft connected to the motor, the torque sensor and the output shaft to move horizontally and linearly.

[0011] In combination with the first aspect, further, the connecting frame is also connected to the connecting block. The connecting frame is not only connected to the slider, but also connected to the connecting block. Such an arrangement makes the overall structure more stable.

[0012] In combination with the first aspect, further, the driving device comprises a motor and a transmission belt, and the motor drives the input shaft rotating shaft through the transmission belt. Preferably, the transmission belt is a V-belt.

[0013] In combination with the first aspect, further, an infrared thermometer is included, the infrared thermometer is arranged on the support frame, and is used to measure the temperature of the tested oil seal. Further, the infrared thermometer can move left and right according to the length of the output shaft to ensure the accuracy of the temperature test.

[0014] In combination with the first aspect, further, it also includes a coupling, the torque sensor is connected to the output shaft through the coupling, one end of the coupling is connected to the torque sensor, and the other end is connected to the output shaft.

[0015] In combination with the first aspect, further, it also includes an oil tank fixing seat and a fixing bracket, the oil tank is arranged on the support frame through the oil tank fixing seat; the linear guide rail is arranged on the support frame through the fixing bracket.

[0016] In combination with the first aspect, further, the thrust unit also includes a connecting support, and the electric cylinder is connected to the fixed bracket via the connecting support.

[0017] In combination with the first aspect, further, the electric cylinder and the connecting shaft are connected by threads; the connecting shaft and the connecting block are connected by threads; the oil seal seat is installed on the oil tank by bolts, and the oil seal seat can be quickly replaced according to the size of the oil seal being tested.

[0018] In combination with the first aspect, further, the connecting block is a T-shaped block, and the connecting frame is a T-shaped frame.

[0019] In combination with the first aspect, further, the oil tank is provided with a temperature sensor and a pressure sensor, the temperature sensor is used to detect the temperature of the oil in the oil tank cavity; the pressure sensor is used to detect the pressure of the oil in the oil tank cavity.

[0020] In combination with the first aspect, further, the oil tank is provided with two coaxially arranged oil seal seats, and the two oil seal seats are respectively arranged at the left and right ends of the oil tank, so that the friction torque and temperature under the coordinated action of the two oil seals can be measured simultaneously. When it is necessary to measure the friction torque and temperature under the coordinated action of the two oil seals, the two tested oil seals are adaptively installed on the output shaft according to the distance between the two oil seal seats, and the two tested oil seals installed on the output shaft are simultaneously pushed into the corresponding oil seal seats by the electric cylinder for testing.

[0021] In a second aspect, the present invention provides a method for testing the friction torque of an oil seal, wherein the oil seal to be tested is tested by the above-mentioned testing device, and the method comprises the following steps:

[0022] Step 1: Start the motor and record the torque N0 of the output shaft when idling through the torque sensor. The infrared thermometer records the temperature T0 of the tested oil seal at this time, that is, record the initial values ​​N0 and T0;

[0023] Step 2: The tested oil seal is installed on the other end of the output shaft. The electric cylinder pushes the slider to make horizontal linear motion on the linear guide rail, which in turn drives the connecting frame, motor, input shaft and output shaft to make linear motion in the horizontal direction. The tested oil seal installed on the other end of the output shaft is pushed into the oil seal seat to complete the installation of the tested oil seal.

[0024] Step 3: After the tested oil seal is installed, start the motor and record the running time t1, t2, t3...t n After that, the corresponding torque sensor values ​​N1, N2, N3...N n , corresponding to the infrared thermometer values ​​T1, T2, T3...T n , where n represents the total number of records, i = 1, 2, 3, ..., n, and the running time is t1 < t2 < t3 < ... < t n , t n Indicates the total running time, N i -N0 is the running time t i The friction torque of the tested oil seal during rotation, T i -T0 is the running time t i The temperature rise of the tested oil seal during its rotation process. After the test is completed, the total running time t can be obtained. n The maximum value of the friction torque MAX(N1-N0,N2-N0,…,N n -N0), the minimum value of friction torque MIN(N1-N0,N2-N0,…,N n -N0), the maximum value of oil seal temperature rise MAX (T1-T0, T2-T0, ..., T n -T0) and the minimum value of oil seal temperature rise MIN (T1-T0, T2-T0,…, T n -T0), and at the same time, the corresponding relationship between the friction torque and the oil seal temperature rise within the same operating time can be obtained, which is of great significance for analyzing whether the failure of the oil seal is caused by failure or aging.

[0025] Compared with the prior art, the present invention provides a device and method for testing the friction torque of an oil seal, which has the following beneficial effects:

[0026] (1) The testing device of the present invention can accurately detect the friction torque of the oil seal during rotation, provide support for the selection of the oil seal, the design of the connection structure and the optimization of the process parameters, improve the connection reliability and stability, and improve the performance of the product. The structure is simpler, easier to implement, low cost, convenient to adjust, and flexible in detection action.

[0027] (2) The test device of the present invention can also detect the temperature rise of the oil seal during the rotation process, and further provide support for the selection of the oil seal, the design of the connection structure and the optimization of the process parameters. (3) The test device of the present invention can realize the rapid installation of the oil seal through the thrust unit, and the loading and testing mechanism can realize the test of the oil seal at different speeds. The torque sensor and infrared thermometer are used to directly measure the friction torque and temperature.

[0028] (3) The testing device of the present invention can simulate the actual assembly conditions and working status of the oil seal, and the indicator design and process personnel can reasonably select key parameters such as interference, surface roughness, and oil seal material.

[0029] (4) The testing device of the present invention can be installed with oil seal seats at both ends of the oil tank, so that the friction torque and temperature under the coordinated action of the two oil seals can be measured simultaneously.

[0030] (5) The testing method of the present invention adopts the testing device of the present invention, which can accurately detect the friction torque and temperature rise of the oil seal during the rotation process, provide support for the selection of the oil seal, the design of the connection structure and the optimization of the process parameters, and the detection action is flexible and easy to adjust. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the three-dimensional structure of the testing device of the present invention;

[0032] Figure 2 It is a schematic diagram of the main structure of the testing device of the present invention.

[0033] The meanings of the reference numerals in the figures are:

[0034] 1-torque sensor; 2-input shaft; 3-transmission belt; 4-motor; 5-infrared thermometer; 6-tested oil seal; 7-oil seal seat; 8-oil tank; 9-oil tank fixing seat; 10-output shaft; 11-support frame; 12-coupling; 13-connecting frame; 14-fixed bracket; 15-linear guide; 16-thrust unit; 16.1-electric cylinder; 16.2-connecting support; 16.3-connecting shaft; 16.4-connecting block; 16.5-slider; 17-temperature sensor; 18-pressure sensor. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may also include different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection content of the present invention.

[0038] like Figure 1 As shown, the test device proposed by the present invention includes a support frame 11, a linear guide 15, a connecting frame 13, a driving device, an input shaft 2, a torque sensor 1, an output shaft 10, an oil seal seat 7, an oil tank 8 and a thrust unit 16; the driving device is connected to one end of the input shaft 2, the other end of the input shaft 2 is connected to the torque sensor 1, the torque sensor 1 is connected to one end of the output shaft 10, and the other end of the output shaft 10 is used to install the tested oil seal 6; the linear guide 15 and the oil tank 8 are sequentially arranged on the support frame 11, the driving device is arranged on the connecting frame 13, and the thrust unit 16 is respectively connected to the connecting frame 13 and the linear guide 15, and the thrust unit 16 can push the connecting frame 13 to move horizontally on the linear guide 15, and then the connecting frame 13 drives the driving device, the input shaft 2, the torque sensor 1 and the output shaft 10 to move horizontally; the oil seal seat 7 is arranged on the oil tank 8, and the oil seal seat 7 matches the tested oil seal 6. The torque sensor 1 is disposed between the input shaft 2 and the output shaft 10 , and is used to detect the torque of the output shaft 10 and the input shaft 2 .

[0039] In a specific implementation of this embodiment, Figure 2As shown, the thrust unit 16 includes an electric cylinder 16.1, a connecting shaft 16.3, a connecting block 16.4 and a slider 16.5; one end of the connecting shaft 16.3 is connected to the electric cylinder 16.1, and the other end is connected to the connecting block 16.4, the connecting block 16.4 is connected to the slider 16.5, the slider 16.5 is matched with the linear guide 15, the slider 16.5 can move horizontally and linearly on the linear guide 15, and the slider 16.5 is also connected to the connecting frame 13. The power of the electric cylinder 16.1 drives the slider 16.5 to move horizontally and linearly on the linear guide 15 through the connecting shaft 16.3 and the connecting block 16.4 in turn, and when the slider 16.5 moves, it drives the connecting frame 13 connected thereto to move horizontally and linearly, thereby driving the motor 4 set on the connecting frame 13, the input shaft 2 connected to the motor 4, the torque sensor 1 and the output shaft 10 to move horizontally and linearly.

[0040] In a specific implementation of this embodiment, the connecting frame 13 is also connected to the connecting block 16.4. The connecting frame 13 is not only connected to the slider 16.5, but also connected to the connecting block 16.4. This arrangement makes the overall structure more stable.

[0041] In a specific implementation of this embodiment, the driving device includes a motor 4 and a transmission belt 3, and the motor 4 drives the input shaft 2 to rotate through the transmission belt 3. Preferably, the transmission belt 3 is a V-belt.

[0042] In a specific implementation of this embodiment, the testing device proposed by the present invention further includes an infrared thermometer 5, which is arranged on the support frame 11 and is used to measure the temperature of the tested oil seal 6. Furthermore, the infrared thermometer 5 can move left and right according to the length of the output shaft 10 to ensure the accuracy of the temperature test.

[0043] In a specific implementation of this embodiment, a coupling 12 is further included, and the torque sensor 1 is connected to the output shaft 10 via the coupling 12 . One end of the coupling 12 is connected to the torque sensor 1 , and the other end is connected to the output shaft 10 .

[0044] In a specific implementation of this embodiment, it also includes an oil tank fixing seat 9 and a fixing bracket 14 , and the oil tank 8 is set on the support frame 11 through the oil tank fixing seat 9; the linear guide rail 15 is set on the support frame 11 through the fixing bracket 14.

[0045] In a specific implementation of this embodiment, the thrust unit 16 further includes a connecting support 16.2, and the electric cylinder 16.1 is connected to the fixing bracket 14 via the connecting support 16.2.

[0046] In a specific implementation of this embodiment, the electric cylinder 16.1 is connected to the connecting shaft 16.3 by threads; the connecting shaft 16.3 is connected to the connecting block 16.4 by threads; the oil seal seat 7 is installed on the oil tank 8 by bolts, and the oil seal seat 7 can be quickly replaced according to the size of the oil seal 6 being tested.

[0047] In a specific implementation of this embodiment, the connecting block 16.4 is a T-shaped block, and the connecting frame 13 is a T-shaped frame.

[0048] In a specific implementation of the present embodiment, a temperature sensor 17 and a pressure sensor 18 are provided on the oil tank 8. The temperature sensor 17 is used to detect the temperature of the oil in the oil tank 8. If the oil temperature is too high, the oil seal temperature and the friction torque will be too high, so the oil temperature must be kept within a reasonable range; the pressure sensor 18 is used to detect the pressure of the oil in the oil tank 8. The pressure of the oil is related to the leakage amount. During each test, the pressure of the oil must be maintained at a relatively stable value, which should be consistent with the actual oil pressure, generally at 0.05Mpa.

[0049] In a specific implementation of this embodiment, two coaxially arranged oil seal seats 7 are arranged on the oil tank 8, and the two oil seal seats 7 are respectively arranged at the left and right ends of the oil tank 8. This arrangement can simultaneously measure the friction torque and temperature under the coordinated action of the two oil seals. When it is necessary to measure the friction torque and temperature under the coordinated action of the two oil seals, the two tested oil seals 6 are installed on the output shaft 10 according to the distance adaptability of the two oil seal seats 7, and the two tested oil seals 6 installed on the output shaft 10 are simultaneously pushed into the corresponding oil seal seats 7 by the electric cylinder 16.1 for testing.

[0050] The present invention also proposes a method for testing the friction torque of an oil seal, and the oil seal 6 to be tested is tested by the above-mentioned testing device, comprising the following steps:

[0051] Step 1: The starting motor 4 records the torque N0 of the output shaft 10 when idling through the torque sensor 1, and the infrared thermometer 5 records the temperature T0 of the tested oil seal 6 at this time, that is, the initial values ​​N0 and T0 are recorded;

[0052] Step 2: The tested oil seal 6 is installed on the other end of the output shaft 10, and the slider 16.5 is pushed by the electric cylinder 16.1 to make horizontal linear motion on the linear guide rail 15, which in turn drives the connecting frame 13, the motor 4, the input shaft 2 and the output shaft 10 to make linear motion in the horizontal direction, and the tested oil seal 6 installed on the other end of the output shaft 10 is pushed into the oil seal seat 7, completing the installation of the tested oil seal 6;

[0053] Step 3: After the tested oil seal 6 is installed, start the motor 4 and record t1, t2, t3, ..., t nThen, the corresponding values ​​of torque sensor 1 are N1, N2, N3...N n , corresponding to the values ​​T1, T2, T3...T of infrared thermometer 5 n , where n represents the total number of records, i = 1, 2, 3, ..., n, and the running time is t1 < t2 < t3 < ... < t n , t n Indicates the total running time, N i -N0 is the running time t i The friction torque of the tested oil seal 6 during rotation, T i -T0 is the running time t i The temperature rise of the tested oil seal 6 during the rotation process. After the test of the tested oil seal 6 is completed, the total running time t can be obtained. n The maximum value of the friction torque MAX(N1-N0,N2-N0,…,N n -N0), the minimum value of friction torque MIN(N1-N0,N2-N0,…,N n -N0), the maximum value of oil seal temperature rise MAX (T1-T0, T2-T0, ..., T n -T0) and the minimum value of oil seal temperature rise MIN (T1-T0, T2-T0,…, T n -T0), and at the same time, the corresponding relationship between the friction torque and the oil seal temperature rise within the same operating time can be obtained, which is of great significance for analyzing whether the failure of the oil seal is caused by failure or aging.

[0054] It should be noted that, in this application, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A test device for oil seal friction torque, characterized in that: It includes a support frame, a linear guide rail, a connecting frame, a driving device, an input shaft, a torque sensor, an output shaft, an oil seal seat, an oil tank and a thrust unit; the driving device is connected to one end of the input shaft, the other end of the input shaft is connected to the torque sensor, the torque sensor is connected to one end of the output shaft, and the other end of the output shaft is used to install the oil seal to be tested; the linear guide rail and the oil tank are sequentially arranged on the support frame, the driving device is arranged on the connecting frame, the thrust unit is respectively connected to the connecting frame and the linear guide rail, the thrust unit can push the connecting frame to move horizontally on the linear guide rail, and then the connecting frame drives the driving device, the input shaft, the torque sensor and the output shaft to move horizontally; the oil seal seat is arranged on the oil tank, and the oil seal seat matches the oil seal to be tested; The oil tank is provided with a temperature sensor and a pressure sensor, wherein the temperature sensor is used to detect the temperature of the oil in the oil tank, and the pressure sensor is used to detect the pressure of the oil in the oil tank; The oil tank is provided with two coaxially arranged oil seal seats, which are respectively arranged at the left and right ends of the oil tank.

2. The oil seal friction torque testing device according to claim 1, characterized in that: The thrust unit includes an electric cylinder, a connecting shaft, a connecting block and a slider; one end of the connecting shaft is connected to the electric cylinder, and the other end is connected to the connecting block, the connecting block is connected to the slider, the slider is matched with the linear guide rail, the slider can move horizontally and linearly on the linear guide rail, and the slider is also connected to the connecting frame.

3. The oil seal friction torque testing device according to claim 1, characterized in that: The driving device comprises a motor and a transmission belt, and the motor drives the input shaft rotation shaft through the transmission belt.

4. The oil seal friction torque testing device according to claim 1, characterized in that: It also includes an infrared thermometer, which is arranged on the support frame and is used to measure the temperature of the tested oil seal.

5. The oil seal friction torque testing device according to claim 1, characterized in that: The utility model also comprises a coupling, and the torque sensor is connected to the output shaft through the coupling.

6. The oil seal friction torque testing device according to claim 2, characterized in that: It also includes an oil tank fixing seat and a fixing bracket. The oil tank is arranged on the supporting frame through the oil tank fixing seat; and the linear guide rail is arranged on the supporting frame through the fixing bracket.

7. The oil seal friction torque testing device according to claim 6, characterized in that: The thrust unit further comprises a connecting support, and the electric cylinder is connected to the fixing support via the connecting support.

8. A method for testing the friction torque of an oil seal, characterized in that: Testing the oil seal to be tested by the testing device according to any one of claims 1 to 7 comprises the following steps: The starting motor records the torque of the output shaft when idling through the torque sensor , the infrared thermometer records the temperature of the oil seal being tested at this time , that is, record the initial value and ; The oil seal to be tested is installed on the other end of the output shaft. The electric cylinder pushes the slider to make horizontal linear motion on the linear guide rail, which in turn drives the connecting frame, the motor, the input shaft and the output shaft to make linear motion in the horizontal direction, and pushes the oil seal to be tested installed on the other end of the output shaft into the oil seal seat to complete the installation of the oil seal to be tested; After the tested oil seal is installed, start the motor and record the running time , , … After that, the corresponding torque sensor value , , … , corresponding to the infrared thermometer value , , … , where n represents the total number of records, , running time , Indicates the total running time; That is, the running time is The friction torque of the tested oil seal during rotation, The running time is The temperature rise of the tested oil seal during its rotation process is measured, and the test of the tested oil seal is completed.

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