An oscillating friction and wear testing machine

Abstract

This invention discloses an oscillating friction and wear testing machine, belonging to the field of testing machines. It includes a frame with an upper and lower platform fixed to the upper part, and a loading mechanism. The loading mechanism is vertically positioned below the lower platform. A loading piston is positioned on the lower platform corresponding to the loading mechanism. A drive motor and an end-face testing spindle are positioned on the upper platform. A drive synchronous pulley and a first rotating disk are fixed on the output shaft of the drive motor. An eccentric pin is provided on the first rotating disk and hinged to a first connecting rod. The end-face testing spindle is rotatably mounted on the upper platform and coaxially arranged with the loading piston. A driven synchronous pulley and a second rotating disk are fixed on the end-face testing spindle. An eccentric pin is provided on the second rotating disk for hinged to the first connecting rod. On the lower platform, a bearing drive seat and a bearing driven seat are correspondingly positioned on both sides of the loading piston. A bearing drive shaft and a bearing driven shaft are rotatably mounted inside the bearing drive seat and the bearing driven seat, respectively. A bearing drive shaft is fixedly connected to a bearing connecting rod.

Description

Technical Field

[0001] This invention relates to an oscillating friction and wear testing machine, belonging to the technical field of testing machines. Background Technology

[0002] A flanged sliding bearing is a type of sliding bearing that integrates a flange structure. This flange structure can transmit and withstand radial loads, axial loads, and a certain amount of torque. When conducting friction and wear tests on this type of sliding bearing, it is necessary to simulate oscillating motion, and to perform both shaft-bearing friction and wear tests under oscillating motion and end-face friction and wear tests on its flange structure under oscillating motion.

[0003] Most existing friction and wear testing machines employ linear reciprocating motion mechanisms or unidirectional rotary motion mechanisms, which cannot simulate oscillating motion and therefore cannot perform oscillating friction and wear tests. Furthermore, existing friction and wear testing machines typically can only simulate one type of motion and can only perform friction and wear tests on a single friction pair. To perform tests on different friction pair types, users often need to configure multiple testing machines, resulting in significant investment. Summary of the Invention

[0004] To address the aforementioned deficiencies in the existing technology, this invention provides a swing friction and wear testing machine capable of simulating swing motion and applicable to various types of friction pairs.

[0005] This invention is achieved through the following technical solution: a swing friction and wear testing machine, comprising a frame and a loading mechanism, characterized in that: an upper platform and a lower platform located below the upper platform are fixed on the upper part of the frame; the loading mechanism is vertically arranged below the lower platform; a vertically arranged, axially movable and rotatable loading piston is provided on the lower platform corresponding to the loading mechanism; a drive motor and an end-face test spindle are provided on the upper platform; the drive motor is vertically fixedly installed on the upper platform; a drive synchronous pulley and a first rotating disk are fixed on the output shaft of the drive motor; and an eccentric pin is provided on the first rotating disk. The end-face test spindle is hinged to the first connecting rod and is rotatably mounted on the upper platform via a spindle seat and coaxially mounted with the loading piston. A driven synchronous pulley and a second rotating disk are fixed on the end-face test spindle. An eccentric pin for hinged to the first connecting rod is provided on the second rotating disk. On the lower platform, a fixed bearing active shaft seat and a movable bearing driven shaft seat are provided on both sides of the loading piston. A bearing active shaft is rotatably mounted in the bearing active shaft seat, and a bearing driven shaft is rotatably mounted in the bearing driven shaft seat. A bearing connecting rod for hinged to the first connecting rod is fixedly connected to the bearing active shaft.

[0006] In this invention, the loading mechanism applies the test force via a loading piston. This invention can perform friction and wear tests on various friction pair types. When the first connecting rod is connected to the bearing connecting rod, a swing friction and wear test of the bearing-bearing friction pair type can be performed. In this case, the sample assembly for the bearing-bearing test is installed between the bearing drive shaft and the bearing driven shaft. When the drive motor drives the first rotating disk to rotate, the first connecting rod drives the bearing connecting rod to swing back and forth, thereby driving the bearing drive shaft to rotate back and forth within a certain angle range, thus simulating swing motion. The loading mechanism applies the test force via the loading piston. When the first connecting rod is connected to the eccentric pin on the second rotating disk, swing friction tests of ball-disc, pin-disc, and end-face friction pairs can be performed. In the friction and wear test, the upper sample is installed at the lower end of the end face test spindle, and the lower sample is installed on the top of the loading piston through the sample seat. When the drive motor drives the first rotating disk to rotate, it drives the second rotating disk and the end face test spindle to reciprocate within a certain angle range through the first connecting rod. The loading mechanism applies the test force through the loading piston. When the driving synchronous pulley on the output shaft of the drive motor is connected to the driven synchronous pulley on the end face test spindle and the first connecting rod is removed, friction and wear tests in the form of ball-disc, pin-disc, and end face friction pairs under rotational motion can be performed.

[0007] Furthermore, an adjusting screw pair is rotatably mounted on the lower platform, and the driven bearing seat is fixedly connected to the screw nut of the adjusting screw pair. The driven bearing seat can be moved by adjusting the screw pair to facilitate the installation of the bearing sample assembly.

[0008] Furthermore, the loading mechanism is a spring loading mechanism. A spring loading mechanism ensures stable loading force and has a long-term holding adjustment function, which can improve the accuracy of test results.

[0009] Furthermore, the spring loading mechanism includes a loading motor, a loading screw, a loading spring, a mounting frame, a moving plate, and a force-applying seat. The mounting frame is fixed to the bottom of the lower platform. The loading screw is vertically arranged inside the mounting frame and rotatably connected to the bottom plate of the mounting frame. The moving plate is slidably connected to a guide rod provided on the mounting frame. A nut is fixedly provided on the moving plate and connected to the loading screw. One end of the loading spring is connected to the moving plate, and the other end is connected to the force-applying seat. The loading screw is drively connected to the loading motor.

[0010] Furthermore, a spherical force-applying element is provided at the top of the force-applying seat.

[0011] Furthermore, the first connecting rod is hinged to the bearing bush connecting rod. A bearing bush sample assembly is disposed between the bearing bush driving shaft and the bearing bush driven shaft. The two ends of the inner sample main shaft of the bearing bush sample assembly are connected to the bearing bush driving shaft and the bearing bush driven shaft, respectively. A sensor push rod is disposed on each side of the loading sleeve of the bearing bush sample assembly. The upper end of the sensor push rod abuts against the loading sleeve, and the lower end of the sensor push rod is disposed on a bearing bush friction force sensor fixed to the upper platform. The connection between the first connecting rod and the bearing bush connecting rod enables the performance of an oscillating friction and wear test in the form of a bearing-bearing bush friction pair. The friction force is measured by the bearing bush friction force sensor.

[0012] Furthermore, the first connecting rod is hinged to the eccentric pin on the second rotating disk, and an end-face sample holder for mounting the lower sample is provided on the top of the loading piston. The upper sample is mounted on the lower end of the end-face test spindle, and the end-face friction force sensor is fixed to the lower platform corresponding to the side of the loading piston. The connection between the first connecting rod and the eccentric pin on the second rotating disk allows for oscillating friction and wear tests in the form of ball-disc, pin-disc, and end-face friction pairs. The friction force is measured by the end-face friction force sensor.

[0013] The beneficial effects of this invention are: the invention has a simple structure and an ingenious overall design, which can simulate swinging motion and rotational motion. It can perform friction and wear tests of various friction pairs on a single testing machine. It can be widely used for durability testing of components such as sliding bearings and seals, and can also be used for determining the anti-fretting wear performance of lubricating grease. It can greatly reduce the user's equipment investment. Moreover, this invention can achieve high-frequency fretting by using an eccentric mechanism, which improves the applicability of the equipment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention used in a bearing-bearing test according to a specific embodiment;

[0015] Figure 2 yes Figure 1 A side view diagram;

[0016] Figure 3 yes Figure 2 A top-down view;

[0017] Figure 4 This is a schematic diagram of the structure of the present invention used in end-face testing in a specific embodiment;

[0018] Figure 5 yes Figure 4 A side view diagram;

[0019] In the diagram, 1. Frame, 2. Loading mechanism, 3. Loading piston, 4. Loading sleeve, 5. Outer sample holder, 6. Inner sample spindle, 7. Bearing driven shaft, 8. Bearing driven shaft seat, 9. Upper platform, 10. Drive motor, 11. Bearing connecting rod, 12. Bearing drive shaft, 13. Bearing drive shaft seat, 14. Bearing sample, 15. Lower platform, 16. Drive synchronous pulley, 17. First rotating disk, 18. First connecting rod, 19. Driven synchronous pulley, 20. End face spindle seat, 21. Second rotating disk, 22. End face test spindle, 23. Sensor push rod, 24. Bearing friction sensor, 25. End face friction sensor, 26. End face sample holder, 27. Lower sample, 28. Upper sample, 29. Adjusting screw pair; 201. Loading motor; 202. Base plate; 203. Loading screw; 204. Moving plate; 205. Guide rod; 206. Loading spring; 207. Force application seat; 208. Spherical force application element. Detailed Implementation

[0020] The technical solution of the present invention will be further described below through non-limiting embodiments and in conjunction with the accompanying drawings.

[0021] As shown in the attached figure, a swing friction and wear testing machine includes a frame 1 and a loading mechanism 2. The frame 1 is a frame structure, and a lower platform 15 and an upper platform 9 are fixed on the upper part of the frame 1 by means of columns. The loading mechanism 2 is vertically positioned below the lower platform 15. A loading piston 3 is vertically arranged on the lower platform 15 corresponding to the loading mechanism 2. The loading piston 3 is mounted on the lower platform via a bearing seat and can move axially and rotate. The upper platform 9 is provided with a drive motor 10 and an end-face test spindle 22. The drive motor 10 is vertically fixedly mounted on the upper platform 9. An active synchronous pulley 16 and a first rotating disk 17 are fixed on the output shaft of the drive motor 10. An eccentrically set eccentric pin is fixed on the first rotating disk 17 and is hinged to one end of the first connecting rod 18. The end-face test spindle 22 is vertically rotatably mounted on the upper platform 9 via an end-face spindle seat 20. The end-face spindle seat 20 is fixed on the upper platform 9. The end-face test spindle 22 is coaxially arranged with the loading piston 3. A driven synchronous pulley 19 and a second rotating disk 21 are fixed on the end-face test spindle 22. An eccentrically set eccentric pin for hinged to the first connecting rod 18 is fixed on the second rotating disk 21. On the lower platform 15, a bearing drive seat 13 and a bearing driven seat 8 are provided on both sides of the loading piston 3. The bearing drive seat 13 is fixed on the lower platform 15, and the bearing driven seat 8 is movable to facilitate the installation of the sample assembly. A bearing drive shaft 12 is rotatably arranged inside the bearing drive seat 13, and a bearing driven shaft 7 is rotatably arranged inside the bearing driven seat 8. The bearing drive shaft 12 is fixedly connected to a bearing connecting rod 11 for hinged connection with the first connecting rod 18. To facilitate the movement of the bearing driven seat 8, in this embodiment, an adjusting screw pair 29 is rotatably arranged on the lower platform 15. The bearing driven seat 8 is slidably arranged on a guide rail provided on the lower platform, and the bearing driven seat 8 is fixedly connected to the screw nut of the adjusting screw pair 29. The bearing driven seat 8 can be moved by adjusting the screw pair 29.

[0022] The loading mechanism 2 in this invention can adopt various structural forms of loading mechanisms in the prior art. In this embodiment, it is preferred that the loading mechanism 2 is a spring loading mechanism. The spring loading mechanism includes a loading motor 201, a loading screw 203, a loading spring 206, a mounting frame, a moving plate 204, and a force-applying seat 207. The mounting frame is fixed to the bottom of the lower platform 15. The mounting frame includes a base plate 202 and two guide rods 205. The upper ends of the guide rods 205 are fixedly connected to the bottom of the lower platform 15. The base plate 202 is fixedly connected between the lower ends of the guide rods 205. The loading screw 203 is vertically arranged in the mounting frame and rotatably connected to the base plate 202 of the mounting frame. The moving plate 204 is slidably connected to the guide rods 205. A nut is fixedly arranged on the moving plate 204 and connected to the loading screw 203. The loading spring 206 is fitted on the outside of the loading screw 203. The lower end of the loading spring 206 is connected to the moving plate 204, and its upper end is connected to the force-applying seat 207. The loading screw 203 is connected to the loading motor 201 via a transmission connection. When the loading mechanism applies the test force, the loading motor 201 drives the loading screw 203 to rotate, which in turn drives the moving plate 204 to move upward along the guide rod 205. The test force is then applied through the loading spring 206, the force-applying seat 207, and the loading piston 3. To ensure accurate application of the test force, this embodiment preferably includes a spherical force-applying element 208 at the top of the force-applying seat 207.

[0023] The drive motor 10 in this invention is used to provide the driving power for the simulated motion form required for the test. This invention can simulate swing motion or rotational motion, thereby enabling friction and wear tests of various friction pair forms.

[0024] Specifically, as shown in the appendix Figures 1-3 As shown, when the other end of the first connecting rod 18 is hinged to the bearing connecting rod 11, a swing friction and wear test in the form of a bearing-bearing friction pair can be performed. At this time, the bearing sample assembly for the bearing-bearing test is installed between the bearing drive shaft 12 and the bearing driven shaft 7. The two ends of the inner sample main shaft 6 of the bearing sample assembly are connected to the bearing drive shaft 12 and the bearing driven shaft 7, respectively. A sensor top rod 23 is provided on both sides of the loading sleeve 4 of the bearing sample assembly. The upper end of the sensor top rod 23 abuts against the loading sleeve 4, and the lower end of the sensor top rod 23 is provided with a bearing friction force sensor 24 fixed to the upper platform 9. When the output shaft of the drive motor 10 drives the first rotating disk 17 to rotate, it drives the bearing connecting rod 11 to swing back and forth through the first connecting rod 18, thereby driving the bearing drive shaft 12 to rotate back and forth within a certain angle range, thus simulating swing motion. The loading mechanism 2 applies test force to the bearing sample assembly through the loading piston 3, and the bearing friction force sensor 24 measures the friction force during the test.

[0025] As attached Figures 4-5As shown, when the other end of the first connecting rod 18 is hinged to the eccentric pin on the second rotating disk 21, a ball-disc, pin-disc, or end-face friction pair type of oscillating friction and wear test can be performed. At this time, an end-face sample holder 26 is set on the top of the loading piston 3, the lower sample 27 is installed on the end-face sample holder 26, and the upper sample 28 is installed on the lower end of the end-face test spindle 22. The end-face friction force sensor 25 is fixed to the lower platform 15 corresponding to the side of the loading piston 3. When the output shaft of the drive motor 10 drives the first rotating disk 17 to rotate, the second rotating disk 21 and the end-face test spindle 22 are driven to reciprocate within a certain angle range through the first connecting rod 18. The loading mechanism 2 applies the test force through the loading piston 3, and the friction force during the test is measured by the end-face friction force sensor 25.

[0026] After connecting the synchronous belt between the driving synchronous pulley 16 on the output shaft of the drive motor 10 and the driven synchronous pulley 19 on the end-face test spindle 22 and removing the first connecting rod, a friction and wear test in the form of ball-disc, pin-disc, and end-face friction pairs under rotational motion can be performed. At this time, the lower specimen 27 is installed on the end-face specimen seat 26, and the upper specimen 28 is installed at the lower end of the end-face test spindle 22. The drive motor 10 drives the end-face test spindle 22 to rotate through the synchronous belt drive, and the loading mechanism 2 applies the test force through the loading piston 3.

[0027] The test load range of this invention is 50–5000 N, the rotation speed is 1–3000 r / min, the oscillation angle is 1–15°, and the oscillation frequency is 0.1–50 Hz. This invention can be widely applied to the durability testing of components such as sliding bearings and seals, and can also be used to determine the anti-fretting wear performance of lubricating greases.

[0028] The other parts in this embodiment are all existing technologies and will not be described in detail here.

Claims

1. A swing friction and wear testing machine, comprising a frame (1) and a loading mechanism (2), characterized in that: The frame (1) is fixed with an upper platform (9) and a lower platform (15) located below the upper platform (9). The loading mechanism (2) is vertically arranged below the lower platform (15). The lower platform (15) is provided with a vertically arranged loading piston (3) that can move axially and rotate, corresponding to the loading mechanism (2). The upper platform (9) is provided with a drive motor (10) and an end face test spindle (22). The drive motor (10) is vertically fixed on the upper platform (9). The output shaft of the drive motor (10) is fixed with an active synchronous pulley (16) and a first rotating disk (17). The first rotating disk (17) is provided with an eccentric pin and is hinged to the first connecting rod (18). The end face test spindle (22) is connected to the main shaft of the machine. The bearing seat is rotatably mounted on the upper platform (9) and coaxially mounted with the loading piston (3). A driven synchronous pulley (19) and a second rotating disk (21) are fixed on the end face test spindle (22). An eccentric pin for hinged connection with the first connecting rod (18) is provided on the second rotating disk (21). On the lower platform (15), a bearing active bearing seat (13) and a movable bearing driven bearing seat (8) are provided on both sides of the loading piston (3). A bearing active shaft (12) is rotatably mounted inside the bearing active bearing seat (13). A bearing driven shaft (7) is rotatably mounted inside the bearing driven shaft seat (8). A bearing connecting rod (11) for hinged connection with the first connecting rod (18) is fixedly connected to the bearing active shaft (12).

2. The oscillating friction and wear testing machine according to claim 1, characterized in that: An adjusting screw pair is rotatably provided on the lower platform (15), and the driven shaft seat (8) of the bearing bush is fixedly connected to the screw nut of the adjusting screw pair.

3. The oscillating friction and wear testing machine according to claim 1 or 2, characterized in that: The loading mechanism (2) is a spring loading mechanism.

4. The oscillating friction and wear testing machine according to claim 3, characterized in that: The spring loading mechanism includes a loading motor (201), a loading screw (203), a loading spring (206), a mounting frame, a moving plate (204), and a force-applying seat (207). The mounting frame is fixed to the bottom of the lower platform (15). The loading screw (203) is vertically arranged in the mounting frame and rotatably connected to the bottom plate (202) of the mounting frame. The moving plate (204) is slidably connected to the guide rod (205) provided on the mounting frame. A nut is fixedly provided on the moving plate (204) and connected to the loading screw (203). One end of the loading spring (206) is connected to the moving plate (204), and the other end is connected to the force-applying seat (207). The loading screw (203) is connected to the loading motor (201) in a transmission connection.

5. The oscillating friction and wear testing machine according to claim 4, characterized in that: The top of the force-applying seat (207) is provided with a spherical force-applying element (208).

6. The oscillating friction and wear testing machine according to claim 1 or 2, characterized in that: The first connecting rod (18) is hinged to the bearing connecting rod (11). A bearing sample assembly is provided between the bearing drive shaft (12) and the bearing driven shaft (7). The two ends of the inner sample main shaft (6) of the bearing sample assembly are connected to the bearing drive shaft (12) and the bearing driven shaft (7) respectively. A sensor top rod (23) is provided on both sides of the loading sleeve (4) of the bearing sample assembly. The upper end of the sensor top rod (23) abuts against the loading sleeve (4). The lower end of the sensor top rod (23) is provided with a bearing friction force sensor (24) fixed to the upper platform (9).

7. The oscillating friction and wear testing machine according to claim 1 or 2, characterized in that: The first connecting rod (18) is hinged to the eccentric pin on the second rotating disk (21). The top of the loading piston (3) is provided with an end face sample seat (26) for installing the lower sample. The upper sample is installed at the lower end of the end face test spindle (22). The end face friction sensor (25) is fixed to the lower platform (15) corresponding to the side of the loading piston (3).

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