Clamping module and sealed bearing air-pressure-resistant service life testing machine

Abstract

The utility model relates to bearing test equipment, and particularly discloses a clamping module and a sealed bearing air pressure resistance life testing machine. Wherein the clamping module comprises an outer ring clamping assembly and an inner ring clamping assembly, the outer ring clamping assembly comprises a clamping seat, a spacer bush and an outer locking cover, and an outer ring mounting hole is formed in the clamping seat. An outer ring check block is arranged in the outer ring mounting hole, and an outer ring clamping interval is formed between the spacer bush and the outer ring check block. And the outer locking cover is positioned at the front end of the outer ring mounting hole and is hermetically locked with the clamping seat. The inner ring clamping assembly comprises a mandrel and an inner locking ring, an inner ring check block is arranged at one end of the mandrel, the inner locking ring is detachably connected with the clamping section, and an inner ring clamping interval is formed between the inner locking ring and the inner ring check block. The clamping module can well simulate the dynamic operation of the sealed bearing, can apply air pressure to the single side of the sealed bearing, and has the advantage of reliable test result.

Description

Technical Field

[0001] The utility model relates to a bearing test device, in particular to a clamping module and a gas pressure endurance life test machine for a sealed bearing. Background Art

[0002] A bearing is an important component in contemporary mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotational accuracy. Service life is one of the key performance parameters of a bearing. According to the usage conditions of different bearings, the considerations for evaluating the service life of a bearing are also different. For example, a sealed bearing is a common type of bearing. The life of a sealed bearing should include not only the accuracy life, failure life, etc., but also the sealing life. Among sealed bearings, there are also special working conditions such as gas pressure sealing and hydraulic sealing. In the sealing life test under the above special working conditions, it is necessary to fully simulate the gas pressure working condition.

[0003] Currently, the bearing sealing life test process in the industry is usually static testing, lacking bearing sealing life test equipment and methods under dynamic operation. Static testing cannot simulate the influence of factors such as the running wear and running temperature rise of the sealing ring on the sealing life, and there are certain limitations in the reliability of the test results. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a clamping module and a gas pressure endurance life test machine for a sealed bearing, which can well simulate the dynamic operation of the sealed bearing, can apply gas pressure to one side of the sealed bearing, and has the advantage of reliable test results.

[0005] To solve the above technical problem, the technical solution provided by the utility model is as follows: A clamping module includes an outer ring clamping assembly and an inner ring clamping assembly. The outer ring clamping assembly includes a clamping seat, a spacer sleeve, and an outer locking cover. An outer ring mounting hole is provided on the clamping seat. One end of the outer ring mounting hole is the front end, and the other end is the rear end.

[0006] An outer ring stop block is provided in the outer ring mounting hole. A test chamber is formed between the outer ring stop block and the front end of the outer ring mounting hole. The spacer sleeve is placed in the test chamber. An outer ring clamping interval is formed between the spacer sleeve and the outer ring stop block. An outer sealing ring is provided in the outer ring clamping interval. The outer locking cover is located at the front end of the outer ring mounting hole and is hermetically locked with the clamping seat. A pressure inlet is provided on the outer locking cover, and the pressure inlet is communicated with the test chamber.

[0007] The inner ring clamping assembly described above includes a mandrel and an inner locking ring. One end of the mandrel includes an inner ring clamping segment, on which an inner ring stopper is provided. The inner locking ring is detachably connected to the clamping segment, and an inner ring clamping interval is formed between the inner locking ring and the inner ring stopper. An inner sealing ring is provided within the inner ring clamping interval. In the connected state, the inner ring clamping interval is aligned with the outer ring clamping interval, and a part of the mandrel extends from the rear end of the outer ring clamping hole.

[0008] When assembling the test module, first insert the mandrel into the inner ring of the test bearing, and lock the inner ring of the test bearing in the inner ring clamping interval through the inner locking ring and the inner ring stopper. Subsequently, place the test bearing into the test chamber from the front end of the outer ring clamping hole, and lock the outer ring of the test bearing in the outer ring clamping interval through the spacer sleeve and the outer locking cover to complete the assembly of the test module.

[0009] After installing the test bearing, a sealed interval is formed in the test chamber, and a gas with a specific pressure can be introduced. There is a relative movement basis between the inner ring clamping assembly and the outer ring clamping assembly, which can simulate high-pressure working conditions in the dynamic operation mode, having the advantages of real working condition simulation and reliable test results.

[0010] Preferably, outer sealing rings are respectively provided between the spacer sleeve and the outer ring mounting hole, and between the outer locking cover and the clamping seat.

[0011] A sealed bearing air pressure endurance testing machine includes a test bench, a driving module, a pressurizing module, and the clamping module described above. An installation seat is provided on the test bench, the clamping seat is connected to the installation seat, and the driving module is used to drive the mandrel to rotate;

[0012] The pressurizing module includes a high-pressure gas source and a gas pressure monitoring unit. The high-pressure gas source is connected to the pressurizing port, and the gas pressure monitoring unit is used to monitor the pressure in the test chamber.

[0013] During the test, the installation operation of the test bearing can be carried out in two steps, namely the assembly of the test module and the assembly of the whole machine. After completing the assembly of the test module, install the test module as a whole on the test bench, where the clamping seat is installed on the installation seat and the mandrel is connected to the driving module.

[0014] Since it is relatively difficult to move the test bench, the driving module, and the pressurizing module, the step-by-step installation can improve the installation efficiency. And after completing the assembly of the test module, an independent static airtightness test can be carried out in advance. If the static airtightness test fails, there is no need to carry out the dynamic operation test, saving test time and improving the test efficiency.

[0015] Preferably, the installation seat includes a base and an upper cover. The base and the upper cover are separately provided and detachably connected; the clamping seat is located between the base and the upper cover.

[0016] Preferably, the driving module includes a power unit and a transmission assembly. The transmission assembly includes a transmission seat and a transmission shaft. The transmission seat is arranged on the test bench, and the transmission shaft is rotatably and movably connected to the transmission seat through a companion bearing; one end of the transmission shaft is connected to the power unit, and the other end is connected to the core shaft.

[0017] The setting of the transmission assembly can improve the stability of torque transmission, reduce interference factors such as vibration transmitted to the core shaft, and ensure the smooth operation of the core shaft and the test bearing.

[0018] Preferably, a lubrication module is further included. The lubrication module includes an oil delivery unit, and the oil delivery unit is used to deliver lubricating oil from the rear end to the outer ring mounting hole.

[0019] The setting of the lubrication module can provide continuous lubrication guarantee for the test bearing, timely supplement lubricating oil during high-speed operation, and can also meet the test requirements of single-side sealed bearings and double-side sealed bearings at the same time.

[0020] Preferably, the lubrication module further includes an oil baffle. The oil baffle is located at the rear end of the outer ring mounting hole and is connected to the clamping seat; in the connected state, the core shaft passes through the oil baffle and there is a gap between the core shaft and the oil baffle.

[0021] The oil baffle can cooperate with the outer ring mounting hole to form a lubrication cavity, reduce the splashing of lubricating oil, and the core shaft does not contact the oil baffle, which can provide space for the high-speed rotation of the core shaft.

[0022] Preferably, the lubrication module includes an oil inlet pipe. The oil outlet end of the oil inlet pipe extends into the outer ring mounting hole from the rear end and is arranged towards the outer ring clamping section.

[0023] Due to the gap between the core shaft and the oil baffle, the lubrication cavity is not a sealed structure. Therefore, the lubricating oil is supplied by the way that the oil inlet pipe extends in and directly sprays towards the test bearing. On the premise of ensuring sufficient lubrication, the flow rate of the lubricating oil is reduced, and further the possibility of the lubricating oil flowing out from the gap between the core shaft and the oil baffle is reduced.

[0024] Preferably, the lubrication module further includes an oil temperature monitoring unit. The oil temperature monitoring unit is used to monitor the temperature of the lubricating oil.

[0025] The oil temperature monitoring unit can indirectly detect the temperature of the test bearing by detecting the temperature of the lubricating oil, providing a basis for the progress of the test.

[0026] Preferably, an oil outlet channel is provided on the clamping seat. The oil inlet of the oil outlet channel is located at the bottom of the lubrication cavity, and the oil outlet is located on the side of the clamping seat and is set lower than the oil inlet; the oil temperature monitoring unit includes a temperature sensor arranged in the oil outlet channel. Brief Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of the air pressure endurance life test machine for the sealed bearing of this embodiment;

[0028] Figure 2 It is a partial schematic diagram of the air pressure endurance life test machine for the sealed bearing of this embodiment;

[0029] Figure 3 It is a schematic structural diagram of the mounting seat in the air pressure endurance life test machine for the sealed bearing of this embodiment;

[0030] Figure 4 It is a schematic structural diagram of the cooperation between the clamping module and the mounting seat in the air pressure endurance life test machine for the sealed bearing of this embodiment;

[0031] Figure 5 It is a schematic structural diagram of the clamping module in the air pressure endurance life test machine for the sealed bearing of this embodiment;

[0032] Figure 6 It is a schematic structural diagram of the clamping seat in the air pressure endurance life test machine for the sealed bearing of this embodiment;

[0033] Figure 7 It is a schematic structural diagram of the state where the inner ring clamping assembly clamps the test bearing in the air pressure endurance life test machine for the sealed bearing of this embodiment. Detailed Description of the Embodiment

[0034] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0035] Embodiment

[0036] As Figures 1 - 3 shown, an air pressure endurance life test machine for a sealed bearing includes a test bench 1, a clamping module 2, a driving module, and a pressurizing module (not shown in the figure). An installation seat 11 is provided on the test bench 1. The installation seat 11 includes a base 112 and an upper cover 111. The base 112 and the upper cover 111 are separately arranged and detachably connected.

[0037] As Figures 4 - 7 shown, the clamping module 2 includes an outer ring clamping assembly 22 and an inner ring clamping assembly 21. As Figures 4 - 6As shown, the outer ring clamping assembly 22 includes a clamping seat 221, a spacer sleeve 228, and an outer locking cover 224. The clamping seat 221 is located between the base 112 and the upper cover 111 and is connected to the mounting seat 11. The clamping seat 221 is provided with an outer ring mounting hole 222. One end of the outer ring mounting hole 222 is the front end, and the other end is the rear end.

[0038] As Figures 4 - 6 shown, an outer ring stopper 2221 is provided in the outer ring mounting hole 222. A test chamber 226 is formed between the outer ring stopper 2221 and the front end of the outer ring mounting hole 222. The spacer sleeve 228 is placed in the test chamber 226 and is slidably sealed with the outer ring mounting hole 222. An outer ring clamping section is formed between the spacer sleeve 228 and the outer ring stopper 2221. The outer locking cover 224 is located at the front end of the outer ring mounting hole 222 and is hermetically locked with the clamping seat 221. Specifically, outer sealing rings are provided between the outer ring clamping section, between the spacer sleeve 228 and the outer ring mounting hole 222, and between the outer locking cover 224 and the clamping seat 221.

[0039] As Figure 4 、 Figure 5 and Figure 7 shown, the inner ring clamping assembly 21 includes a mandrel 211 and an inner locking ring 212. One end of the mandrel 211 includes an inner ring clamping section. An inner ring stopper is provided on the inner ring clamping section. The inner locking ring 212 is detachably connected to the clamping section, and an inner ring clamping section is formed between the inner locking ring 212 and the inner ring stopper. An inner sealing ring is provided in the inner ring clamping section.

[0040] In the connected state, the inner ring clamping section is aligned with the outer ring clamping section, and a part of the mandrel 211 extends from the rear end of the outer ring mounting hole 222.

[0041] The driving module is used to drive the mandrel 211 to rotate. Specifically, as Figure 1 and Figure 2 shown, the driving module includes a power unit 32 and a transmission assembly 31. The transmission assembly 31 includes a transmission seat 311 and a transmission shaft 312. The transmission seat 311 is arranged on the test bench 1. The transmission shaft 312 is rotatably and movably connected to the transmission seat 311 through a companion bearing. One end of the transmission shaft 312 is connected to the power unit 32, and the other end is connected to the part of the mandrel 211 extending from the rear end of the outer ring mounting hole 222. The setting of the transmission assembly 31 can improve the stability of torque transmission, reduce interference factors such as vibration transmitted to the mandrel 211, and ensure the smooth operation of the mandrel 211 and the test bearing. The power unit 32 includes a motor, and the motor is belt-driven with the transmission shaft 312.

[0042] As Figure 4 andFigure 5 As shown, a pressure port 225 is provided on the outer locking cover 224, and the pressure port 225 communicates with the test chamber 226. The pressure module includes a high-pressure gas source and a pressure monitoring unit. The high-pressure gas source is connected to the pressure port 225 and communicates with the test chamber 226. The pressure monitoring unit is used to monitor the pressure in the test chamber 226.

[0043] During the test, the installation operation of the test bearing can be carried out in two steps, namely, the assembly of the test module and the assembly of the whole machine.

[0044] When assembling the test module, first, the mandrel 211 is inserted into the inner ring of the test bearing 5, and the inner ring of the test bearing 5 is locked in the inner ring clamping section through the inner locking ring 212 and the inner ring stopper. Subsequently, the test bearing 5 is placed into the test chamber 226 from the front end of the outer ring clamping hole, and the outer ring of the test bearing 5 is locked in the outer ring clamping section through the spacer sleeve 228 and the outer locking cover 224, completing the assembly of the test module. After completing the assembly of the test module, the whole test module is installed on the test bench 1, where the clamping seat 221 is installed on the mounting seat 11, and the mandrel 211 is connected to the drive module.

[0045] Since the test bench 1, the drive module, and the pressure module are relatively difficult to move, the step-by-step installation can improve the installation efficiency. And after completing the assembly of the test module, an independent static airtightness test can be carried out in advance. If the static airtightness test fails, there is no need to carry out the dynamic operation test, saving test time and improving the test efficiency.

[0046] After completing the installation of the test bearing, the test chamber 226 forms a closed section. The setting of the pressure module can introduce gas with a specific pressure into the test chamber 226 to simulate high-pressure working conditions in the dynamic operation mode, having the advantages of real working condition simulation and reliable test results.

[0047] It further includes a lubrication module. The lubrication module includes an oil delivery unit and an oil temperature monitoring unit. The oil delivery unit delivers lubricating oil to the test bearing from the rear end of the outer ring mounting hole 222. The oil temperature monitoring unit is used to monitor the temperature of the lubricating oil. The setting of the lubrication module can provide continuous lubrication guarantee for the test bearing, timely supplement lubricating oil during high-speed operation, and can also meet the test requirements of single-side sealed bearings and double-side sealed bearings at the same time.

[0048] Such as Figures 4 - 6As shown, specifically, the oil delivery unit includes an oil inlet pipe 4. The oil outlet end of the oil inlet pipe 4 extends into the outer ring mounting hole 222 from the rear end and is arranged towards the outer ring clamping section. The lubrication module further includes an oil baffle 12. The oil baffle 12 is located at the rear end of the outer ring mounting hole 222 and is connected to the clamping seat 221. In the connected state, the mandrel 211 passes through the oil baffle 12 with a gap therebetween.

[0049] The oil baffle 12 can cooperate with the outer ring mounting hole 222 to form a lubrication cavity 227, reducing the splashing of lubricating oil. And there is no contact between the mandrel 211 and the oil baffle 12, which can provide space for the high-speed rotation of the mandrel 211. In addition, due to the gap between the mandrel 211 and the oil baffle 12, the lubrication cavity 227 is not a sealed structure. Therefore, the lubricating oil is supplied by the way that the oil inlet pipe 4 extends in and directly sprays towards the test bearing. On the premise of ensuring sufficient lubrication, the flow rate of the lubricating oil is reduced, thereby reducing the possibility of the lubricating oil flowing out from the gap between the mandrel 211 and the oil baffle 12.

[0050] As Figures 4 - 6 shown, specifically, an oil outlet channel 223 is provided on the clamping seat 221. The oil inlet of the oil outlet channel 223 is located at the bottom of the lubrication cavity 227, and the oil outlet is located on the side of the clamping seat 221 and is set lower than the oil inlet.

[0051] The lubrication module further includes an oil temperature monitoring unit for monitoring the temperature of the lubricating oil. Specifically, the oil temperature detection unit includes a temperature sensor arranged in the oil outlet channel 223.

[0052] By detecting the temperature of the lubricating oil, the oil temperature monitoring unit can indirectly detect the temperature of the test bearing, providing a basis for the test.

[0053] A method for testing the air pressure endurance life of a sealed bearing uses the sealed bearing air pressure endurance life testing machine as described above;

[0054] It at least includes the following steps:

[0055] S1. Module assembly: Install the test bearing between the inner ring clamping section and the outer ring clamping section. At this time, one end of the mandrel 211 extends out from the rear end of the outer ring clamping hole, and the test cavity 226 is in a sealed state.

[0056] Specifically, first insert the mandrel 211 into the inner ring of the test bearing, and lock the inner ring of the test bearing in the inner ring clamping section through the inner locking ring 212 and the inner ring block. Then place the test bearing into the test cavity 226 from the front end of the outer ring clamping hole, and lock the outer ring of the test bearing in the outer ring clamping section through the spacer sleeve 228 and the outer locking cover 224 to complete the assembly of the test module.

[0057] S2. Air tightness detection: Set the working pressure to P 0 , and the static pressure drop threshold to ΔP 1 . The pressurizing module works to introduce the initial pressure P 0 into the test chamber 226 and maintain the pressure for 10 - 30 minutes.

[0058] During the pressure maintenance process, monitor the pressure in the test chamber 226 and obtain the static pressure drop per unit time p 1 in the test chamber 226 in real - time. When p 1 > ΔP 1 , it is determined that the static seal of the test bearing is unqualified and the test is stopped.

[0059] S3. Installation: Install the clamping seat 221 on the mounting seat 11, and connect the mandrel 211 to the driving module.

[0060] S4. Operation: Set the dynamic pressure drop threshold to ΔP 2 , set the dynamic pressure compensation threshold to P S , where P S = 0.8 - 0.9P 0 . The pressurizing module works to introduce the initial pressure P 0 into the test chamber 226, and the driving module works to drive the mandrel 211 and the inner ring of the test bearing to rotate.

[0061] Monitor the pressure in the test chamber 226 and obtain the dynamic pressure drop per unit time p 2 and the running time H in the test chamber 226. When p 2 > ΔP 2 , it is determined that the seal of the test bearing fails, and the running time H at this time is the air pressure resistance life of the test bearing.

[0062] During the operation, monitor the real - time pressure p in the test chamber 226. When p < P S , the pressurizing module works to introduce pressure into the test chamber 226 until P 0 .

[0063] The step - by - step installation of the test bearing can improve the installation efficiency and facilitate the pre - detection of air tightness. Taking the pressure drop speed of the test chamber 226 as an indirect parameter for judging air tightness can lift the restriction on the detection position compared with directly monitoring at the sealing ring, and can complete the detection under the dynamic operation of the bearing.

[0064] During the test, monitor the pressure in the test chamber 226 and replenish the pressure in time after the pressure drops to ensure the stability of the working pressure in the test chamber 226. Compared with continuously introducing pressure, the dynamic pressure compensation form allows the pressure to vary within a certain range, and can judge the sealing performance through the change of pressure on the premise of maintaining the pressure fluctuation amplitude.

[0065] The air pressure resistance life test method of the sealed bearing of the present application can complete the test under the operating state of the bearing, and has the advantages of reliable test results and high efficiency.

[0066] Furthermore, set the warning temperature rise as ΔT 1 , when the temperature rise per unit time t of the lubricating oil > ΔT 1 , then the oil delivery unit increases the lubricating oil flow rate by 1 unit.

[0067] The oil delivery unit continuously supplies lubricating oil for the operation of the test bearing. The oil temperature monitoring unit can indirectly detect the temperature of the test bearing by detecting the lubricating oil temperature, providing a basis for judging the operating state of the test. The temperature parameter of the test bearing will affect the performance of the sealing ring, so it is necessary to control the temperature of the test bearing.

[0068] In view of the non-sealed structure of the lubrication chamber 227, the lubricating oil is transported in a jet form, and the test bearing cannot be completely immersed in the lubricating oil. Therefore, the flow rate of the lubricating oil largely determines the lubrication effect and the cooling effect. When the temperature rise rate of the oil temperature reaches the warning temperature rise, it is determined that the lubrication is insufficient, that is, the lubricating oil is insufficient, and the lubricating oil delivery volume of the oil delivery unit is increased to improve the lubrication state.

[0069] Furthermore, set the shutdown temperature rise as ΔT 2 , when the temperature rise per unit time t of the lubricating oil > ΔT 2 , then stop the test. Specifically, the shutdown temperature rise ΔT 2 is greater than the warning temperature rise ΔT 1， and ΔT 2 = 1.5 - 2ΔT 1 .

[0070] When the temperature rise rate of the oil temperature reaches the shutdown temperature rise, it is determined that the bearing fails or the machining is unqualified. Continuing the test is meaningless and accurate sealing life parameters cannot be obtained. Therefore, the test can be directly stopped and the test bearing can be replaced.

[0071] In summary, the above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A clamping module, characterized in that: It includes an outer ring clamping assembly and an inner ring clamping assembly, wherein the outer ring clamping assembly includes a clamping seat, a spacer and an outer locking cover; the clamping seat is provided with an outer ring mounting hole, one end of the outer ring mounting hole is the front end, and the other end is the rear end; An outer ring stopper is provided in the outer ring mounting hole, and a test cavity is formed between the outer ring stopper and the front end of the outer ring mounting hole; the spacer is placed in the test cavity, and an outer ring clamping interval is formed between the spacer and the outer ring stopper, and an outer sealing ring is provided in the outer ring clamping interval; the outer locking cover is located at the front end of the outer ring mounting hole and is sealed and locked with the clamping seat; a pressurizing port is provided on the outer locking cover, and the pressurizing port is connected with the test cavity; The inner ring clamping assembly includes a core shaft and an inner locking ring, one end of the core shaft includes an inner ring clamping segment, the inner ring clamping segment is provided with an inner ring stopper, the inner locking ring is detachably connected to the clamping segment, and an inner ring clamping interval is formed between the inner locking ring and the inner ring stopper, and an inner sealing ring is provided in the inner ring clamping interval; in the connected state, the inner ring clamping interval is aligned with the outer ring clamping interval, and a part of the core shaft extends out from the rear end of the outer ring clamping hole.

2. The clamping module according to claim 1, characterized in that: External sealing rings are respectively arranged between the spacer and the outer ring mounting hole, and between the outer locking cover and the clamping seat.

3. A sealed bearing air pressure resistance life tester, characterized in that: It comprises a test bench, a driving module, a pressurizing module, and a clamping module as claimed in claim 1 or 2, wherein the test bench is provided with a mounting seat, the clamping seat is connected to the mounting seat, and the driving module is used to drive the spindle to rotate; The pressurizing module comprises a high-pressure gas source and a gas pressure monitoring unit. The high-pressure gas source is connected to the pressurizing port, and the gas pressure monitoring unit is used to monitor the pressure in the test chamber.

4. The sealed bearing air pressure resistance life tester according to claim 3, characterized in that: The mounting seat comprises a base and an upper cover, wherein the base and the upper cover are separately arranged and detachably connected; the clamping seat is located between the base and the upper cover.

5. The sealed bearing air pressure resistance life tester according to claim 3, characterized in that: The driving module includes a power unit and a transmission assembly, the transmission assembly includes a transmission seat and a transmission shaft, the transmission seat is arranged on the test bench, and the transmission shaft is rotatably connected to the transmission seat through a test bearing; one end of the transmission shaft is connected to the power unit, and the other end is connected to the core shaft.

6. The sealed bearing air pressure resistance life tester according to any one of claims 3 to 5, characterized in that: It also includes a lubrication module, which includes an oil delivery unit. The oil delivery unit is used to deliver lubrication oil from the rear end to the outer ring mounting hole.

7. The sealed bearing air pressure resistance life tester according to claim 6, characterized in that: The lubrication module also includes an oil baffle plate, which is located at the rear end of the outer ring mounting hole and connected to the clamping seat; in the connected state, the core shaft passes through the oil baffle plate and a gap is left between the core shaft and the oil baffle plate.

8. The sealed bearing air pressure resistance life tester according to claim 7, characterized in that: The lubrication module comprises an oil inlet pipeline, the oil outlet end of which extends from the rear end into the outer ring mounting hole and is arranged toward the outer ring clamping interval.

9. The sealed bearing air pressure resistance life tester according to claim 6, characterized in that: The lubrication module further comprises an oil temperature monitoring unit, and the oil temperature monitoring unit is used to monitor the temperature of the lubricating oil.

10. The sealed bearing air pressure resistance life tester according to claim 9, characterized in that: The clamping seat is provided with an oil outlet channel, the oil inlet of the oil outlet channel is located at the bottom of the lubrication cavity, the oil outlet is located on the side of the clamping seat and is arranged lower than the oil inlet; the oil temperature monitoring unit includes a temperature sensor arranged in the oil outlet channel.

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