Air pressure resistant service life testing machine and testing method for sealed bearing

Abstract

The invention relates to bearing test equipment, and particularly discloses a sealed bearing air pressure resistance service life testing machine and a testing method. The air-pressure-resistant service life testing machine for the sealed bearing comprises a test bed, a clamping module, a driving module and a pressurizing module, 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 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; the inner ring clamping assembly comprises a mandrel and an inner locking ring, an inner ring check block is arranged on an inner ring clamping subsection, and an inner ring clamping interval is formed between the inner locking ring and the inner ring check block. The pressurizing module comprises a high-pressure air source and an air pressure monitoring unit. The air pressure resistant service life testing machine for the sealed bearing 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 invention relates to a bearing testing device, in particular to a sealed bearing air pressure resistance life testing machine and a testing method. Background Art

[0002] Bearings are an important component in contemporary mechanical equipment. Their main function is to support mechanical rotating bodies, reduce the friction coefficient during their movement, and ensure their rotation accuracy. Service life is one of the key performance parameters of bearings, and the factors considered in evaluating the service life of bearings vary depending on the operating conditions of different bearings. For example, sealed bearings are a common type of bearings. In addition to the precision life and damage life, the life of sealed bearings should also include the sealing life. Among sealed bearings, there are also special working conditions such as pneumatic seals and hydraulic seals. In the seal life test of the above special working conditions, it is necessary to fully simulate the pneumatic working conditions.

[0003] At present, the bearing seal life test process in the industry is usually static testing, and there is a lack of bearing seal life test equipment and methods under dynamic operation. Static testing cannot simulate the impact of factors such as seal ring operation wear and operating temperature rise on seal life, and the reliability of the test results has certain limitations. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a sealed bearing air pressure resistance life tester and test method, which can well simulate the dynamic operation of the sealed bearing and apply air pressure on one side of the sealed bearing, and has the advantage of reliable test results.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: A sealed bearing air pressure resistance life tester, comprising at least:

[0006] A test bench, wherein the test bench is provided with a mounting seat;

[0007] A clamping module, wherein the clamping module comprises an outer ring clamping assembly and an inner ring clamping assembly;

[0008] The outer ring clamping assembly comprises a clamping seat, a spacer and an outer locking cover, wherein the clamping seat is connected to the mounting seat; 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;

[0009] 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; 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;

[0010] The inner ring clamping assembly comprises a mandrel and an inner locking ring, one end of the mandrel comprises 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; in the connected state, the inner ring clamping interval is aligned with the outer ring clamping interval;

[0011] A driving module, wherein the driving module is used to drive the spindle 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 test module assembly and the whole machine assembly.

[0014] 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 block, then place the test bearing into the test cavity 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 and the outer locking cover to complete the assembly of the test module. 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 mounting seat, and the mandrel is connected to the drive module.

[0015] Since the test bench, drive module and pressurization module are relatively difficult to move, step-by-step installation can improve installation efficiency. After the test module is assembled, an independent static air tightness test can be carried out in advance. If the static air tightness test fails, there is no need to carry out a dynamic operation test, which saves test time and improves test efficiency.

[0016] After the test bearing is installed, the test chamber forms a closed area. The setting of the pressurizing module can pass gas of specific pressure into the test chamber to simulate high-pressure working conditions in the dynamic operation mode. It has the advantages of realistic working condition simulation and reliable test results.

[0017] Preferably, the mounting seat comprises a base and an upper cover, wherein the base and the upper cover are separately arranged and detachably connected; and the clamping seat is located between the base and the upper cover.

[0018] Preferably, the drive 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.

[0019] 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.

[0020] Preferably, a lubrication module is further included, wherein the lubrication module includes an oil inlet pipe, an oil outlet end of the oil inlet pipe extends from the rear end into the outer ring mounting hole and is arranged toward the outer ring clamping interval.

[0021] The setting of the lubrication module can provide continuous lubrication guarantee for the test bearing, replenish lubricating oil in time under high-speed operation, and can also adapt to the test requirements of single-sided sealed bearings and double-sided sealed bearings at the same time.

[0022] Preferably, the lubrication module further comprises 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.

[0023] The oil baffle plate can cooperate with the outer ring mounting hole to form a lubrication cavity to reduce the splash of lubricating oil, and the core shaft and the oil baffle plate are not in contact, which can provide space for the high-speed operation of the core shaft. In addition, due to the gap between the core shaft and the oil baffle plate, the lubrication cavity is not a sealed structure, so the lubricating oil is supplied by extending the oil inlet pipe and spraying it directly to the test bearing. Under the premise of ensuring sufficient lubrication, the flow of lubricating oil is reduced, thereby reducing the possibility of lubricating oil flowing out of the gap between the core shaft and the oil baffle plate.

[0024] Preferably, 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.

[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 test.

[0026] A sealed bearing air pressure resistance life test method, using the sealed bearing air pressure resistance life test machine as described above;

[0027] At least the following steps are included:

[0028] 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 extends out from the rear end of the outer ring clamping hole, and the test cavity is sealed;

[0029] S2. Air tightness test: Set the working pressure to P0 and the static pressure drop threshold to ΔP1, and start the pressurization module to introduce the initial pressure P0 into the test chamber and maintain the pressure for 10 to 30 minutes;

[0030] During the pressure-maintaining process, the pressure in the test chamber is monitored, and the static pressure drop per unit time in the test chamber is obtained in real time as p1; when p1>ΔP1, the static seal of the test bearing is judged to be unqualified, and the test is stopped;

[0031] S3. Installation: Install the clamping seat on the mounting seat, and connect the mandrel to the driving module;

[0032] S4. Operation: Set the dynamic pressure drop threshold to ΔP2, the pressurizing module works, and the initial pressure P0 is introduced into the test chamber. The driving module works, and the core shaft and the inner ring of the test bearing are driven to rotate;

[0033] Monitor the pressure in the test chamber, obtain the dynamic pressure drop per unit time in the test chamber as p2, and the running time as H; when p2>ΔP2, it is determined that the test bearing seal has failed, and the running time H at this time is the air pressure resistance life of the test bearing.

[0034] The test bearing is installed in steps, which can improve the installation efficiency and facilitate the pre-test of air tightness. Compared with direct monitoring at the sealing ring, the pressure drop rate of the test chamber is used as an indirect parameter to determine the air tightness, which can remove the restriction on the detection position and complete the detection under the dynamic operation of the bearing.

[0035] The air pressure resistance life test method of the sealed bearing of the present application can complete the test while the bearing is in operation, and has the advantages of reliable test results and high efficiency.

[0036] As a preferred embodiment, the dynamic pressure compensation threshold is set to P S , P S =0.8~0.9P0;

[0037] In step S4, the real-time pressure p in the test chamber is monitored. When p<P S When , the pressurizing module works and the pressure reaches P0 in the test chamber.

[0038] During the test, the pressure of the test chamber is monitored and the pressure is replenished in time after the pressure drops to ensure the stability of the working pressure in the test chamber. Compared with the continuous pressure input, the dynamic pressure replenishment form allows the pressure to change within a certain range. Under the premise of maintaining the pressure fluctuation range, the sealing performance can be determined by the pressure change.

[0039] Preferably, it further comprises a lubrication module, wherein the lubrication module comprises an oil delivery unit and an oil temperature monitoring unit, and the oil delivery unit delivers lubricating oil from the rear end of the outer ring mounting hole to the test bearing;

[0040] The oil temperature monitoring unit is used to monitor the temperature of the lubricating oil; the warning temperature rise is set to ΔT1, and when the temperature rise per unit time of the lubricating oil t>ΔT1, the oil delivery unit increases the flow rate of the lubricating oil by 1 unit.

[0041] The oil delivery unit continuously delivers 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 temperature of the lubricating oil, providing a basis for determining the state of the test. The temperature parameters of the test bearing will affect the performance of the sealing ring, so the temperature of the test bearing needs to be controlled.

[0042] When the oil temperature rise rate reaches the warning temperature rise, it is judged 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.

[0043] Preferably, the shutdown temperature rise is set to ΔT2, and the test is stopped when the temperature rise per unit time of the lubricating oil is t>ΔT2.

[0044] When the oil temperature rise rate reaches the shutdown temperature rise, the bearing is judged to have failed or the processing is unqualified. It is meaningless to continue the test and it is impossible to obtain accurate seal life parameters. Therefore, the test can be stopped directly and the test bearing can be replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a schematic diagram of the structure of the sealed bearing air pressure resistance life tester of this embodiment;

[0046] Figure 2 It is a partial schematic diagram of the sealed bearing air pressure resistance life tester of this embodiment;

[0047] Figure 3 This is a schematic diagram of the structure of the mounting seat in the sealed bearing air pressure resistance life tester of this embodiment;

[0048] Figure 4 This is a schematic diagram of the structure of the clamping module and the mounting seat in the sealed bearing air pressure resistance life tester of this embodiment;

[0049] Figure 5 This is a schematic diagram of the structure of the clamping module in the sealed bearing air pressure resistance life tester of this embodiment;

[0050] Figure 6 This is a schematic diagram of the structure of the clamping seat in the sealed bearing air pressure resistance life tester of this embodiment;

[0051] Figure 7 It is a structural schematic diagram of the inner ring clamping assembly clamping the test bearing in the sealed bearing air pressure resistance life testing machine of this embodiment. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0053] Example

[0054] like Figure 1-Figure 3 As shown, a sealed bearing air pressure resistance life tester includes a test bench 1, a clamping module 2, a driving module and a pressurizing module (not shown in the figure), the test bench 1 is provided with a mounting seat 11, the mounting 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.

[0055] like Figure 4-Figure 7 As shown, the clamping module 2 includes an outer ring clamping assembly 22 and an inner ring clamping assembly 21. Figure 4-Figure 6 As shown, the outer ring clamping assembly 22 includes a clamping seat 221, a spacer 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 which is the front end, and the other end is the rear end.

[0056] like Figure 4-Figure 6 As shown, an outer ring stopper 2221 is provided in the outer ring mounting hole 222, and a test cavity 226 is formed between the outer ring stopper 2221 and the front end of the outer ring mounting hole 222. The spacer 228 is placed in the test cavity 226 and is slidably sealed with the outer ring mounting hole 222, and an outer ring clamping interval is formed between the spacer 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 sealed and locked with the clamping seat 221. Specifically, an outer sealing ring is provided in the outer ring clamping interval, between the spacer 228 and the outer ring mounting hole 222, and between the outer locking cover 224 and the clamping seat 221.

[0057] like Figure 4 , Figure 5 and Figure 7 As shown, the inner ring clamping assembly 21 includes a core shaft 211 and an inner locking ring 212, one end of the core shaft 211 includes an inner ring clamping segment, the inner ring clamping segment is provided with an inner ring stopper, the inner locking ring 212 is detachably connected to the clamping segment, and an inner ring clamping interval is formed between the inner locking ring 212 and the inner ring stopper, and the inner ring clamping interval is provided with an inner sealing ring.

[0058] In the connected state, the inner ring clamping section is aligned with the outer ring clamping section, and a portion of the core shaft 211 extends out from the rear end of the outer ring mounting hole 222 .

[0059] The driving module is used to drive the core shaft 211 to rotate. Figure 1 and Figure 2As shown, the driving module includes a power unit 32 and a transmission assembly 31, and 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, and the transmission shaft 312 is rotatably connected to the transmission seat 311 through a test 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 core shaft 211 extending out of 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 core shaft 211, and ensure the smooth operation of the core shaft 211 and the test bearing. The power unit 32 includes a motor, and the motor and the transmission shaft 312 are driven by a belt.

[0060] like Figure 4 and Figure 5 As shown, the outer locking cover 224 is provided with a pressurizing port 225, and the pressurizing port 225 is communicated with the test chamber 226. 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 225 and communicated with the test chamber 226, and the gas pressure monitoring unit is used to monitor the pressure in the test chamber 226.

[0061] During the test, the installation operation of the test bearing can be carried out in two steps, namely the test module assembly and the whole machine assembly.

[0062] 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 interval through the inner locking ring 212 and the inner ring stopper, and then the test bearing 5 is placed into the test cavity 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 interval through the spacer 228 and the outer locking cover 224, and the assembly of the test module is completed. After the test module is assembled, the test module is installed as a whole on the test bench 1, wherein the clamping seat 221 is installed on the mounting seat 11, and the mandrel 211 is connected to the drive module.

[0063] Since the test bench 1, the driving module and the pressurizing module are relatively difficult to move, step-by-step installation can improve installation efficiency. After the test module assembly is completed, an independent static air tightness test can be performed in advance. If the static air tightness test fails, there is no need to perform a dynamic operation test, which saves test time and improves test efficiency.

[0064] After the test bearing is installed, the test chamber 226 forms a closed area. The setting of the pressurizing module can pass gas of specific pressure into the test chamber 226 to simulate high-pressure working conditions in the dynamic operation mode, which has the advantages of realistic working condition simulation and reliable test results.

[0065] It also includes a lubrication module, which 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, and 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, replenish lubricating oil in time under high-speed operation, and can also meet the test requirements of single-sided sealed bearings and double-sided sealed bearings at the same time.

[0066] like Figure 4-Figure 6 As shown, specifically, the oil delivery unit includes an oil inlet pipeline 4, the oil outlet end of the oil inlet pipeline 4 extends from the rear end into the outer ring mounting hole 222 and is arranged toward the outer ring clamping interval. The lubrication module also includes an oil baffle plate 12, which is located at the rear end of the outer ring mounting hole 222 and connected to the clamping seat 221. In the connected state, the core shaft 211 passes through the oil baffle plate 12, and a gap is left between the core shaft 211 and the oil baffle plate 12.

[0067] The oil baffle plate 12 can cooperate with the outer ring mounting hole 222 to form a lubrication cavity 227 to reduce the splashing of lubricating oil, and the core shaft 211 and the oil baffle plate 12 are not in contact, which can provide space for the high-speed operation of the core shaft 211. In addition, due to the gap between the core shaft 211 and the oil baffle plate 12, the lubrication cavity 227 is not a sealed structure, so the lubricating oil is supplied by extending the oil inlet pipe 4 and directly spraying it to the test bearing. Under 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 of the gap between the core shaft 211 and the oil baffle plate 12.

[0068] like Figure 4-Figure 6 As shown, specifically, the clamping seat 221 is provided with an oil outlet channel 223, 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 at the side of the clamping seat 221 and is arranged lower than the oil inlet.

[0069] The lubrication module further comprises an oil temperature monitoring unit, and the oil temperature detection unit is used to monitor the temperature of the lubricating oil. Specifically, the oil temperature detection unit comprises a temperature sensor disposed in the oil outlet channel 223 .

[0070] 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 test.

[0071] A sealed bearing air pressure resistance life test method, using the sealed bearing air pressure resistance life test machine as described above;

[0072] At least the following steps are included:

[0073] 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 core shaft 211 extends from the rear end of the outer ring clamping hole, and the test cavity 226 is in a sealed state.

[0074] Specifically, first, the mandrel 211 is inserted into the inner ring of the test bearing, and the inner ring of the test bearing is locked in the inner ring clamping interval through the inner locking ring 212 and the inner ring stopper. Then, the test bearing is placed into the test cavity 226 from the front end of the outer ring clamping hole, and the outer ring of the test bearing is locked in the outer ring clamping interval through the spacer 228 and the outer locking cover 224, completing the assembly of the test module.

[0075] S2. Air tightness test: set the working pressure to P0 and the static pressure drop threshold to ΔP1, and operate the pressurizing module to introduce an initial pressure P0 into the test chamber 226 and maintain the pressure for 10 to 30 minutes.

[0076] During the pressure maintenance process, the pressure in the test chamber 226 is monitored, and the static pressure drop per unit time in the test chamber 226 is obtained in real time as p1. When p1>ΔP1, the static seal of the test bearing is determined to be unqualified, and the test is stopped.

[0077] S3. Installation: The clamping seat 221 is installed on the mounting seat 11, and the core shaft 211 is connected to the driving module.

[0078] S4. Operation: Set the dynamic pressure drop threshold to ΔP2 and the dynamic pressure replenishment threshold to P S , P S =0.8~0.9P0, the pressurizing module works, and the initial pressure P0 is introduced into the test chamber 226, and the driving module works, and the driving core shaft 211 and the inner ring of the test bearing rotate.

[0079] Monitor the pressure in the test chamber 226, and obtain the dynamic pressure drop per unit time in the test chamber 226 as p2 and the operating time as H; when p2>ΔP2, it is determined that the test bearing seal has failed, and the operating time H at this time is the air pressure resistance life of the test bearing.

[0080] During operation, the real-time pressure p in the test chamber 226 is monitored. When p<P S When , the pressurizing module works and introduces pressure to P0 into the test chamber 226 .

[0081] The test bearing is installed in steps, which can improve the installation efficiency and provide convenience for the pre-test of air tightness. Compared with direct monitoring at the sealing ring, the pressure drop rate of the test chamber 226 is used as an indirect parameter for determining air tightness, which can remove the restriction on the detection position and complete the detection under the dynamic operation of the bearing.

[0082] During the test, the pressure of the test chamber 226 is monitored, and the pressure is replenished in time after the pressure drops to ensure the stability of the working pressure in the test chamber 226. Compared with the continuous pressure input, the dynamic pressure replenishment form allows the pressure to change within a certain range. Under the premise of maintaining the pressure fluctuation range, the sealing performance can be determined by the pressure change.

[0083] The air pressure resistance life test method of the sealed bearing of the present application can complete the test while the bearing is in operation, and has the advantages of reliable test results and high efficiency.

[0084] Furthermore, the warning temperature rise is set to ΔT1. When the temperature rise per unit time of the lubricating oil is t>ΔT1, the oil delivery unit increases the flow rate of the lubricating oil by 1 unit.

[0085] The oil delivery unit continuously delivers 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 temperature of the lubricating oil, providing a basis for determining the state of the test. The temperature parameters of the test bearing will affect the performance of the sealing ring, so the temperature of the test bearing needs to be controlled.

[0086] In view of the non-sealed structure of the lubrication chamber 227, the lubricating oil is delivered in the form of a jet, and the test bearing cannot be completely immersed in the lubricating oil. Therefore, the flow rate of the lubricating oil determines the lubrication effect and the cooling effect to a large extent. When the oil temperature rise rate 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.

[0087] Furthermore, the shutdown temperature rise is set to ΔT2. When the temperature rise per unit time of the lubricating oil is greater than ΔT2, the test is stopped. 1， And ΔT2=1.5~2ΔT1.

[0088] When the oil temperature rise rate reaches the shutdown temperature rise, the bearing is judged to have failed or the processing is unqualified. It is meaningless to continue the test and it is impossible to obtain accurate seal life parameters. Therefore, the test can be stopped directly and the test bearing can be replaced.

[0089] In short, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sealed bearing air pressure resistance life tester, characterized in that: At least: A test bench, wherein the test bench is provided with a mounting seat; A clamping module, 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 and an outer locking cover, wherein the clamping seat is connected to the mounting seat; 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; 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; 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 comprises a mandrel and an inner locking ring, one end of the mandrel comprises 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; in the connected state, the inner ring clamping interval is aligned with the outer ring clamping interval; A driving module, wherein the driving module is used to drive the spindle to rotate; 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.

2. The sealed bearing air pressure resistance life tester according to claim 1, 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.

3. The sealed bearing air pressure resistance life tester according to claim 1, 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.

4. The sealed bearing air pressure resistance life tester according to any one of claims 1 to 3, characterized in that: It also includes a lubrication module, which includes an oil inlet pipeline. The oil outlet end of the oil inlet pipeline extends from the rear end into the outer ring mounting hole and is arranged toward the outer ring clamping interval.

5. The sealed bearing air pressure resistance life tester according to claim 4, 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.

6. The sealed bearing air pressure resistance life tester according to claim 5, 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.

7. A method for testing the air pressure resistance life of a sealed bearing, characterized in that: Using a sealed bearing air pressure resistance life tester as described in any one of claims 1 to 3; At least the following steps are included: 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 extends out from the rear end of the outer ring clamping hole, and the test cavity is sealed; S2. Air tightness test: Set the working pressure to P0 and the static pressure drop threshold to ΔP1, and start the pressurization module to introduce the initial pressure P0 into the test chamber and maintain the pressure for 10 to 30 minutes; During the pressure-maintaining process, the pressure in the test chamber is monitored, and the static pressure drop per unit time in the test chamber is obtained in real time as p1; when p1>ΔP1, the static seal of the test bearing is judged to be unqualified, and the test is stopped; S3. Installation: Install the clamping seat on the mounting seat, and connect the mandrel to the driving module; S4. Operation: Set the dynamic pressure drop threshold to ΔP2, the pressurizing module works, and the initial pressure P0 is introduced into the test chamber. The driving module works, and the core shaft and the inner ring of the test bearing are driven to rotate; Monitor the pressure in the test chamber, obtain the dynamic pressure drop per unit time in the test chamber as p2, and the running time as H; when p2>ΔP2, it is determined that the test bearing seal has failed, and the running time H at this time is the air pressure resistance life of the test bearing.

8. The method for testing the air pressure resistance life of a sealed bearing according to claim 7, characterized in that: Set the dynamic pressure compensation threshold to P S , P S =0.8~0.9P0; In step S4, the real-time pressure p in the test chamber is monitored. When p<P S When , the pressurizing module works and the pressure reaches P0 in the test chamber.

9. The method for testing the air pressure resistance life of a sealed bearing according to claim 7 or 8, characterized in that: It also 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 from the rear end of the outer ring mounting hole to the test bearing; The oil temperature monitoring unit is used to monitor the temperature of the lubricating oil; the warning temperature rise is set to ΔT1, and when the temperature rise per unit time of the lubricating oil t>ΔT1, the oil delivery unit increases the flow rate of the lubricating oil by 1 unit.

10. The air pressure resistance life test method of a sealed bearing according to claim 9, characterized in that: Set the shutdown temperature rise to ΔT2. When the temperature rise per unit time of the lubricating oil t>ΔT2, stop the test.

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