Universal self-lubricating bearing service life experiment device

Abstract

The invention belongs to the technical field of bearing wear life test, and particularly relates to a universal self-lubricating bearing life test device, after a tested bearing is installed, a transmission servo motor is controlled to work to drive the tested bearing to swing in a reciprocating manner, and then according to test requirements, the tested bearing is subjected to self-lubricating test. The axial loading servo electric cylinder and the radial loading servo electric cylinder are respectively controlled to output corresponding power, and the axial loading force sensor and the radial loading force sensor are used to acquire the magnitude of the radial load and the axial load of the current tested bearing. Adjustment is carried out by controlling the output power of the axial loading servo electric cylinder and the radial loading servo electric cylinder again; by adjusting the rotating speed of the transmission servo motor and the output loads of the axial loading force sensor and the radial loading force sensor, the health state collection of the tested bearing under different working conditions can be realized. Through the above design, the experiment parameter adjusting range is wide, the measurement precision is high, and the experiment installation operation is simple.

Description

Technical Field

[0001] The present application belongs to the technical field of bearing wear life testing, and in particular relates to a universal self-lubricating bearing life testing device. Background Art

[0002] Self-lubricating bearings are widely used in the aviation industry due to their high load-bearing capacity, excellent impact resistance, good wear resistance, self-aligning, maintenance-free design, and ability to withstand both axial and radial forces. Since the development of self-lubricating bearing production in my country is relatively late compared to other countries, the methods and technologies for measuring their reliability and lifespan are still underdeveloped. Therefore, life testing has become an effective approach to analyze self-lubricating bearing failure mechanisms, establish self-lubricating bearing life models, and derive self-lubricating bearing life formulas. A review of existing self-lubricating bearing life testing platforms at home and abroad revealed that while many institutions have developed various life testing machines for bearing friction and wear testing, these have been plagued by limitations in functionality, complex experimental operations, low data monitoring accuracy, a lack of unified design standards, and difficulties in online monitoring due to various factors, including experimental conditions and requirements. Furthermore, during the bearing assembly process, there are risks of slippage or locking due to the difficulty in accurately controlling interference, as well as data quality degradation caused by interference from multiple components during data transmission.

[0003] It is necessary to develop a high-frequency composite swing self-lubricating bearing life testing machine with a wide range of experimental parameter adjustment, high measurement accuracy, simple experimental installation and operation, automation, universality, and the ability to collect data representing the health status of the bearing online. Summary of the Invention

[0004] The purpose of this application is to provide a universal self-lubricating bearing life test device to solve the problems of existing test devices, such as single test machine function, complex experimental operation, low accuracy of experimental data monitoring, lack of unified design standards, difficulty in online monitoring, poor data quality, and slippage and damage caused by bearing assembly.

[0005] The technical solution of the present application is: a universal self-lubricating bearing life test device, comprising a test bench, a drive mechanism, a radial loading assembly, and an axial loading assembly; the test bench is mounted on the ground, the drive mechanism is mounted on the test bench, and the drive mechanism is used to drive the test bearing to swing back and forth; the test bench is used to support the drive mechanism; the test bearing is mounted on the drive mechanism, and the radial loading assembly and the axial loading assembly are respectively mounted at the radial and axial positions of the test bearing;

[0006] The driving mechanism includes a transmission servo motor, a reducer and a rotating main shaft; the rotating main shaft is provided with a first coupling and a second coupling, the first coupling is connected between the transmission servo motor and the reducer, and the transmission servo motor is used to provide torque power for the reciprocating swing of the test bearing; the reducer is provided with a torque sensor, and the torque sensor and the reducer are used to collect the driving torque in real time; the second coupling is connected between the reducer and the radial loading servo electric cylinder; the rotating main shaft is connected to the driving mechanism, the radial loading assembly and the axial loading assembly in sequence in the axial direction, the test bearing is provided on the rotating main shaft, and the rotating main shaft and the test bearing are interference fit; the radial loading assembly and the axial loading assembly can respectively apply radial load and axial load to the test bearing.

[0007] Preferably, the radial loading assembly includes a radial loading servo electric cylinder, a radial loading force sensor and a test bearing base; the test bearing is coaxially connected between the rotating spindle and the test bearing base, the radial loading force sensor and the radial loading servo electric cylinder are arranged on one side of the test bearing base, the inner end of the radial loading force sensor is connected to the test bearing base through an ear piece, and the outer end is connected to the radial loading servo electric cylinder; the installation direction of the radial loading force sensor is perpendicular to the horizontal axis.

[0008] Preferably, the test bearing is in close contact with one side of the inner hole of the split test bearing base, and the other side is in close contact with another part of the split bearing seat; the split test bearing base is connected by bolts.

[0009] Preferably, the radial displacement sensor is installed through the radial displacement mounting hole on the top of the split test bearing seat; the temperature sensor is installed through the temperature sensor mounting hole on the side; and the acoustic emission sensor is installed through the acoustic emission sensor slot on the top.

[0010] Preferably, the axial loading assembly includes a second support bearing seat, an axial loading rod, an axial loading plate, an axial loading force sensor and an axial loading servo cylinder; one side of the axial loading rod is in contact with the radial loading assembly, and the other side is connected to the axial loading plate; a cavity is provided in the axial loading rod, and the second support bearing seat is fixedly connected to the cavity. There are two groups of second support bearing seats and they are arranged at intervals along the axial direction of the rotating main shaft. A support bearing is connected between the second support bearing seat and the rotating main shaft; the second support bearing seat is used to support the axial loading rod; the axial loading rod, the axial loading plate, the axial loading force sensor and the axial loading servo cylinder are connected end to end along the axial direction of the axial loading rod, and the end of the axial loading rod away from the axial loading plate is connected to the test bearing base.

[0011] Preferably, the experimental bench is further provided with a first fixed angle box and a second fixed angle box; the first fixed angle box is connected to the transmission servo motor, and the second fixed angle box is connected to the axial loading force sensor and the axial loading servo electric cylinder.

[0012] Preferably, two groups of first support bearing seats are provided between the second coupling and the radial loading assembly, support bearings are provided between the first support bearing seats and the rotating main shaft, and the outside of the first support bearings is connected to the experimental bench.

[0013] The universal self-lubricating bearing life test device of the present application drives the test bearing to swing back and forth by controlling the operation of the transmission servo motor after the test bearing is installed, and then controls the axial loading servo electric cylinder and the radial loading servo electric cylinder to output corresponding powers according to the test requirements, and obtains the radial and axial loads currently borne by the test bearing through the axial loading force sensor and the radial loading force sensor. When deviation occurs, the output power of the axial loading servo electric cylinder and the radial loading servo electric cylinder is controlled again for adjustment; by adjusting the speed of the transmission servo motor and the output load of the axial loading force sensor and the radial loading force sensor, the health status of the test bearing under different working conditions can be collected. Through the above design, the experimental parameters of the present application have a wide adjustment range, high measurement accuracy, and simple experimental installation and operation. By online control and adjustment of the working parameters of the transmission servo motor, the axial loading force sensor and the radial loading force sensor, the automation, universality and online characterization capabilities of the entire test device are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions provided by this application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application.

[0015] Figure 1 This is a schematic diagram of the overall structure of this application;

[0016] Figure 2 This is a schematic diagram of the connection structure of the driving mechanism, radial loading component and axial loading component of this application.

[0017] Figure 3 Schematic diagram of the bearing seat structure to be tested in this application

[0018] 1. Transmission servo motor; 2. First coupling; 3. Reducer; 4. Second coupling; 5. First support bearing seat; 6. Rotating spindle; 7. Test bearing; 8. Radial loading servo electric cylinder; 9. Radial loading force sensor; 10. Test bearing base; 11. Second support bearing seat; 12. Axial loading rod; 13. Axial loading plate; 14. Axial loading force sensor; 15. Axial loading servo electric cylinder; 16. Experimental bench; 17. First fixed angle box; 18. Second fixed angle box. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0020] A universal self-lubricating bearing life test device, such as Figure 1 and Figure 2 As shown, the test bench 16 includes a test bench 16, a drive mechanism, a radial loading assembly, and an axial loading assembly. The test bench 16 is installed on the ground, and the drive mechanism is installed on the test bench 16. The drive mechanism is used to drive the test bearing 7 to oscillate back and forth. The test bench 16 is used to support the drive mechanism. The test bearing 7 is installed on the drive mechanism, and the radial loading assembly and axial loading assembly are respectively installed in the radial and axial positions of the test bearing 7.

[0021] The drive mechanism includes a transmission servo motor 1, a reducer 3, and a rotating spindle 6. The rotating spindle 6 is equipped with a first coupling 2 and a second coupling 4. The first coupling 2 is connected between the transmission servo motor 1 and the reducer 3. The transmission servo motor 1 provides torque for the reciprocating oscillation of the test bearing 7. The reducer 3 is equipped with a torque sensor, which, together with the reducer 3, collects the driving torque in real time and ensures the uniform oscillation of the test bearing 7. The second coupling 4 is connected between the reducer 3 and the radial loading servo cylinder 8. The rotating spindle 6 is a stepped shaft. It is sequentially connected to the drive mechanism, radial loading assembly, and axial loading assembly along its axis. It is assembled to the test bearing 7 through an interference fit. This ensures that there is no relative motion between the inner ring of the test bearing 7 and the rotating spindle 6 during the test. The axial and radial loads are applied along the axis and diameter of the test bearing 7, preventing unintended slippage and deformation. The radial loading assembly and axial loading assembly can respectively apply radial and axial loads to the test bearing 7.

[0022] The radial loading assembly includes a radial loading servo cylinder 8, a radial loading force sensor 9, and a test bearing base 10. The test bearing 7 is coaxially connected between the rotating spindle 6 and the test bearing base 10. Sensors for acoustic emission, temperature, and other functions can also be installed on the test bearing base 10. The radial loading force sensor 9 and the radial loading servo cylinder 8 are located on one side of the test bearing base 10. The inner end of the radial loading force sensor 9 is connected to the test bearing base 10 via an ear, and the outer end is connected to the radial loading servo cylinder 8. When the radial loading servo cylinder 8 applies a radial load to the test bearing 7, the radial loading force sensor 9 transmits the radial load value in real time. The radial loading force sensor 9 is installed perpendicular to the horizontal axis.

[0023] Preferably, the test bearing 7 is positioned with the split test bearing base 10 by means of positioning pins; the test bearing 7 is fixed with the split test bearing base 10 by means of bolts to ensure that there is no relative movement between the outer ring of the test bearing 7 and the split test bearing base 10; the test bearing base 10 is prefabricated with holes for installing acoustic emission, temperature, displacement and other sensors, which are used to install sensors and wiring in reserved positions.

[0024] The axial loading assembly includes a second support bearing seat 11, an axial loading rod 12, an axial loading plate 13, an axial loading force sensor 14, and an axial loading servo electric cylinder 15. One side of the axial loading rod 12 is in contact with the radial loading assembly, and the other side is connected to the axial loading plate 13. A cavity is provided in the axial loading rod 12, and the second support bearing seat 11 is fixedly connected to the cavity. There are two groups of second support bearing seats 11, which are spaced apart along the axial direction of the rotating main shaft 6. A support bearing is connected between the second support bearing seat 11 and the rotating main shaft 6. The second support bearing seat 11 is used to support the axial loading rod 12. The axial loading rod 12, the axial loading plate 13, the axial loading force sensor 14, and the axial loading servo electric cylinder 15 are connected end to end along the axial direction of the axial loading rod 12. The end of the axial loading rod 12 away from the axial loading plate 13 is connected to the test bearing base 10.

[0025] The axial loading servo electric cylinder 15 applies an axial load to the test bearing 7 through the axial loading pull rod 12 and the test bearing base 10. During this process, the axial loading force sensor 14 can transmit the value of the axial load in real time.

[0026] The test piece can be disassembled and assembled by disassembling and assembling the 7 test bearings, which is relatively convenient.

[0027] After the test bearing 7 is installed, the test bearing 7 is driven to swing back and forth by controlling the transmission servo motor 1. Then, according to the test requirements, the axial loading servo electric cylinder 15 and the radial loading servo electric cylinder 8 are controlled to output corresponding powers, and the radial loading force sensor 14 and the radial loading force sensor 9 are used to obtain the radial and axial loads currently applied to the test bearing 7. When deviation occurs, the output power of the axial loading servo electric cylinder 15 and the radial loading servo electric cylinder 8 is controlled again for adjustment. By adjusting the speed of the transmission servo motor 1 and the output loads of the axial loading force sensor 14 and the radial loading force sensor 9, the health status of the test bearing 7 under different working conditions can be collected. Through the above design, the experimental parameters of this application have a wide adjustment range, high measurement accuracy, and simple experimental installation and operation.

[0028] By online controlling and adjusting the working parameters of the transmission servo motor 1 , the axial load force sensor 14 and the radial load force sensor 9 , the automation, universalization and online characterization capability of the entire test device are achieved.

[0029] Preferably, two sets of first support bearing seats 5 are provided between the second coupling 4 and the radial loading assembly, support bearings are provided between the first support bearing seats 5 and the rotating main shaft 6 , and the outside of the first support bearings is connected to the experimental bench 16 .

[0030] The first supporting bearing seat 5 and the second supporting bearing seat 11 are both used to support and fix the rotating main shaft 6, ensuring that the rotating main shaft 6 is installed on the same axis that is aligned and horizontal, while reducing vibration.

[0031] Preferably, the test bench 16 is also equipped with a first fixed angle box 17 and a second fixed angle box 18. The first fixed angle box 17 is connected to the transmission servo motor 1, and the second fixed angle box 18 is connected to the axial load force sensor 14 and the axial load servo cylinder 15. The first and second fixed angle boxes 17 and 18 are L-shaped steel structures with reinforced end faces. The bottom of the L-shape is fixed to the upper surface of the test bench 16, and the bottom surface has vertical holes for supporting the transmission servo motor 1 and the axial load servo cylinder 15, respectively.

[0032] Finally, it should be noted that the drawings of the embodiments disclosed in the present invention only involve structures related to the embodiments disclosed in the present invention. Other structures can refer to common designs. In the absence of conflicts, the same embodiment and different embodiments of the present invention can be combined with each other.

[0033] Finally: 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, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A universal self-lubricating bearing life test device, characterized by: The invention comprises a test bench (16), a driving mechanism, a radial loading assembly and an axial loading assembly; the test bench (16) is arranged on the ground, the driving mechanism is arranged on the test bench (16), and the driving mechanism is used to drive the test bearing (7) to swing back and forth; the test bench (16) is used to carry the driving mechanism; the test bearing (7) is arranged on the driving mechanism, and the radial loading assembly and the axial loading assembly are respectively arranged at the radial and axial positions of the test bearing (7); The driving mechanism comprises a transmission servo motor (1), a reducer (3) and a rotating main shaft (6); a first coupling (2) and a second coupling (4) are provided on the rotating main shaft (6); the first coupling (2) is connected between the transmission servo motor (1) and the reducer (3); the transmission servo motor (1) is used to provide torque power for the reciprocating swing of the test bearing (7); a torque sensor is provided on the reducer (3); the torque sensor and the reducer (3) are used to collect the driving torque in real time; the second coupling (4) is connected between the reducer (3) and the radial loading servo electric cylinder (8); the rotating main shaft (6) is connected to the driving mechanism, the radial loading component and the axial loading component in sequence in the axial direction; the test bearing (7) is provided on the rotating main shaft (6), and the rotating main shaft (6) and the test bearing (7) are interference fit; the radial loading component and the axial loading component can respectively apply radial load and axial load to the test bearing (7).

2. The universal self-lubricating bearing life test device according to claim 1, characterized in that: The radial loading assembly comprises a radial loading servo electric cylinder (8), a radial loading force sensor (9) and a test bearing base (10); the test bearing (7) is coaxially connected between the rotating main shaft (6) and the test bearing base (10); the radial loading force sensor (9) and the radial loading servo electric cylinder (8) are arranged on one side of the test bearing base (10); the inner end of the radial loading force sensor (9) is connected to the test bearing base (10) through an ear piece, and the outer end is connected to the radial loading servo electric cylinder (8); the installation direction of the radial loading force sensor (9) is perpendicular to the horizontal axis.

3. The universal self-lubricating bearing life test device according to claim 2, characterized in that: The tested bearing (7) and the tested bearing base (10) are interference-fitted; the tested bearing (7) and the tested bearing base (10) are assembled in a split manner; and the radial displacement sensor and the temperature sensor are in contact with the outer ring of the tested bearing.

4. The universal self-lubricating bearing life test device according to claim 2, characterized in that: The axial loading assembly comprises a second supporting bearing seat (11), an axial loading rod (12), an axial loading plate (13), an axial loading force sensor (14) and an axial loading servo electric cylinder (15); one side of the axial loading rod (12) is in contact with the radial loading assembly, and the other side is connected to the axial loading plate (13); a cavity is provided in the axial loading rod (12), and the second supporting bearing seat (11) is fixedly connected in the cavity. There are two groups of the second supporting bearing seats (11) and they are arranged along the rotating main shaft (6). The second support bearing seat (11) and the rotating main shaft (6) are arranged at intervals in the axial direction, and a support bearing is connected between the second support bearing seat (11) and the rotating main shaft (6); the second support bearing seat (11) is used to support the axial loading rod (12); the axial loading rod (12), the axial loading plate (13), the axial loading force sensor (14) and the axial loading servo electric cylinder (15) are connected end to end along the axial direction of the axial loading rod (12), and the end of the axial loading rod (12) away from the axial loading plate (13) is connected to the test bearing base (10).

5. The universal self-lubricating bearing life test device according to claim 4, characterized in that: The experimental bench (16) is also provided with a first fixed angle box (17) and a second fixed angle box (18); the first fixed angle box (17) is connected to the transmission servo motor (1), and the second fixed angle box (18) is connected to the axial loading force sensor (14) and the axial loading servo electric cylinder (15).

6. The universal self-lubricating bearing life test device according to claim 1, characterized in that: Two sets of first support bearing seats (5) are provided between the second coupling (4) and the radial loading assembly, support bearings are provided between the first support bearing seats (5) and the rotating main shaft (6), and the outside of the first support bearings is connected to the experimental bench (16).

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