An experimental apparatus for detecting the coefficient of friction and cavitation phenomena on the surface of sliding bearing friction pairs.

Abstract

This invention discloses an experimental apparatus for detecting the surface friction coefficient and cavitation phenomenon of a sliding bearing friction pair, comprising a loading component, a rotating component, a gas bearing component, a force measuring component, a lubrication component, and a photographing component. The loading component has an experimental workpiece connected to its end, and the rotating component has a transparent disk connected to its end, located below the loading component. The experimental workpiece rotates relative to the transparent disk, generating friction, and cavitation occurs after reaching a certain rotational speed. The gas bearing component and the force measuring component are both connected to the loading component; the lubrication component is connected below the experimental workpiece; and the photographing component is mounted above the transparent disk. This invention, by setting a specific load and rotational speed, can accurately detect the surface friction coefficient of a sliding bearing friction pair in real time and can visually record cavitation phenomena. It has advantages such as high measurement accuracy, good resistance to vibration interference, and a reasonable layout.

Description

Technical Field

[0001] This invention relates to the field of friction coefficient detection and air suspension technology, and more specifically, to an experimental apparatus for detecting the friction coefficient and cavitation phenomenon on the surface of a sliding bearing friction pair. Background Technology

[0002] Tribology plays a crucial role in practical engineering applications and the study of material surface science mechanisms. It provides the theoretical foundation for the design and development of mechanical equipment such as bearing mating pairs and piston-piston-cylinder mating pairs. Meanwhile, friction and wear experiments provide important experimental evidence for the development of tribological theory. The two studies are mutually supportive and influential, and equally important. As the requirements for friction reduction performance of relatively moving surfaces in precision machinery continue to increase, surface configuration technologies such as microtexturing and surface material modification technologies are receiving increasing attention. The difference in friction reduction effect between optimized surface configuration technologies and modification technologies is relatively small, which places high demands on the accuracy of surface friction coefficient detection in friction and wear experiments.

[0003] Hydrostatic gas bearing technology uses externally supplied gas to form a thin gas film between two moving parts, serving as a lubricating medium and providing support and lubrication. This significantly reduces friction between the moving parts. Compared to other bearing technologies, it offers advantages such as high precision, high reliability, and cleanliness.

[0004] Furthermore, cavitation occurs during the high-speed rotation of oil-lubricated friction pairs, which affects the load-bearing capacity, friction coefficient, and wear shedding of the friction pairs. Therefore, observing cavitation through friction and wear experiments is of great significance. Currently available friction and wear testing equipment generally uses torque sensors to measure the friction coefficient, relying on rolling bearings as supporting and connecting components. This cannot eliminate the influence of rolling bearing friction. Additionally, the use of motor drives introduces significant vibration interference. These factors greatly affect the measurement accuracy of the friction coefficient. Moreover, cavitation occurs within the lubricating oil film between the friction pairs, which is only a few micrometers thick. The cavitation bubbles themselves are also extremely small, and there is further obstruction from the friction pairs themselves. These factors make it difficult for current friction and wear equipment to directly record cavitation phenomena. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an experimental device capable of accurately detecting the friction coefficient of sliding bearing friction pairs and visually recording the cavitation phenomenon of lubricating oil. This experimental device is fully functional, simple in structure, easy to operate, rationally laid out, and highly accurate in measurement.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] An experimental apparatus for detecting the coefficient of friction and cavitation phenomenon on the surface of a sliding bearing friction pair is provided. It includes a loading assembly 9 for providing load, a rotating assembly 1 for providing rotational motion, a gas bearing assembly 8 for transmitting frictional torque, a force measuring assembly 7 for measuring mechanical signals, a lubrication assembly 4 for providing oil lubrication, and a photographing assembly 10 for visually recording cavitation phenomena. The loading assembly 9 is connected to an experimental workpiece 6 at its end, and the rotating assembly 1 is connected to a transparent disk 5 at its end, located below the loading assembly 9. The experimental workpiece 6 rotates relative to the transparent disk 5, generating friction, and cavitation occurs after reaching a certain rotational speed. The gas bearing assembly 8 and the force measuring assembly 7 are both connected to the loading assembly 9. The lubrication assembly 4 is connected below the experimental workpiece 6. The photographing assembly 10 is mounted above the transparent disk 5.

[0008] This invention provides an experimental apparatus for accurately detecting the surface friction coefficient of a sliding bearing friction pair and visually recording cavitation phenomena. A loading component 9 provides a precise load to the experimental workpiece 6. A rotating component 1 drives a transparent disk 5 to rotate at a certain speed. A lubrication component 4 provides oil lubrication. The experimental workpiece 6 and the transparent disk 5 rotate relative to each other within the lubrication component 4, generating friction. A force measuring component 7 detects the mechanical signals generated during the friction process in real time. A gas bearing component 8 provides gas lubrication, reducing additional friction during the transmission of frictional torque. A recording component 10 visually records the cavitation phenomena generated during the friction process. Through the coordinated connection of these components, this invention can accurately measure the surface friction coefficient of a sliding bearing friction pair and visually record the cavitation phenomena of the lubricating oil.

[0009] Furthermore, the shooting assembly 10 includes a high-speed camera 101 for shooting and recording cavitation phenomena and a tripod 102 for supporting the high-speed camera.

[0010] Furthermore, the gas bearing assembly 8 includes a thrust hydrostatic gas bearing 81, a thrust hydrostatic bearing worktable 82 for placing the thrust hydrostatic gas bearing, a radial porous gas bearing 83, and a radial gas bearing seat 84 for mounting and fixing the radial porous gas bearing, wherein the radial gas bearing seat is fixedly mounted on the radial gas bearing support frame 85.

[0011] Furthermore, the force measuring component 7 includes a pressure sensor 71 for detecting the applied force, a tension sensor 72 for detecting the tangential frictional force, and a force transmission component 73 for transmitting the tangential frictional force. The data detected by the pressure sensor 71 and the tension sensor 72 are transmitted to the signal acquisition system.

[0012] Furthermore, the lubrication assembly 4 includes a transparent oil cylinder 41 for storing lubricating oil and two transparent oil cylinder covers 42 for preventing oil splashing. The transparent oil cylinder covers 42 are placed above the transparent oil cylinder 41, and the transparent oil cylinder 41 is rigidly connected to the loading assembly 9.

[0013] Furthermore, the loading assembly 9 includes a lever 911, a tray 912 hinged to the counterweight end of the lever for holding weights, a support assembly 92 hinged to the loading end of the lever for transmitting radial loads, a load-bearing platform 3, and a hinge seat 913 and a pad 914 with a limiting groove installed at the bottom of the load-bearing platform. The lever 911 and the hinge seat 913 are hinged to the lever fulcrum hole. The loading end of the lever 911 is placed above the limiting groove of the pad 914. The limiting groove of the pad 914 is used to limit the left and right swing of the lever 911 and keep it horizontal during unloading.

[0014] Furthermore, the support assembly 92 includes a first support rod 921, a second support rod 922, and a hydraulic cylinder support rod 923 for transmitting radial loads; the first support rod 921 is hinged to one end of the lever 911 below, and the second support rod 922 is connected to the thrust hydrostatic bearing worktable 82 above, with the first support rod 921 and the second support rod 922 connected via a pressure sensor 71; the hydraulic cylinder support rod 923 is rigidly connected to the thrust gas hydrostatic bearing 81 below and to the bottom of the transparent hydraulic cylinder 41 above, and its horizontal displacement is restricted by a radially porous gas bearing 83.

[0015] Furthermore, the radial porous gas bearing 83 and the cylinder support rod 94 cooperate to form a radial gas bearing working pair. The radial gas bearing working pair uses gas as a suspension medium, allowing the cylinder support rod 923 to rotate freely without introducing additional friction.

[0016] Furthermore, the transparent oil cylinder 41 has an oil inlet hole 411 and an oil outlet hole 412 for the flow of lubricating oil at its left and right ends, respectively, and an oil passage 413 for oil drainage at its bottom. A clamp 93 for fixing the experimental workpiece is installed at the bottom of the transparent oil cylinder.

[0017] Furthermore, the transparent disk 5 and the experimental workpiece 6 rotate relative to each other within the hydraulic cylinder 41 and generate friction. The experimental workpiece 6, the clamp 93, the transparent hydraulic cylinder 41, the hydraulic cylinder support rod 923 are rigidly connected to the thrust hydrostatic gas bearing 81, and generate a relative motion tendency under the influence of frictional torque.

[0018] Furthermore, the thrust hydrostatic gas bearing 81 is placed above the thrust hydrostatic bearing worktable 82 to form a thrust hydrostatic gas bearing working pair. The thrust hydrostatic gas bearing working pair uses gas as a suspension medium and can rotate together with the experimental workpiece 6 without introducing additional friction. The thrust hydrostatic gas bearing 81 is connected to the force transmission component 73 on its side.

[0019] Furthermore, the force transmission component 73 includes a T-shaped force measuring rod 731, a pulley 734, a counterweight 735, and two fixed clamping plates 733. One end of the T-shaped force measuring rod 731 is connected to one end of a tension sensor 72 via a steel wire 732, and the other end of the tension sensor 72 is connected to the fixed clamping plate 733 via a steel wire 732. The other end of the T-shaped force measuring rod 731 is connected to the counterweight 735 via a steel wire 732 and the pulley 734. The pulley 734 is mounted on the other fixed clamping plate 733, and the fixed clamping plate 733 is mounted on a radial gas bearing support frame 85. The radial gas bearing support frame 85 is fixedly mounted on the load-bearing frame 3.

[0020] Furthermore, the rotating assembly 1 includes a motor 11 for providing the rotational motion of the transparent disk, a motor support frame 2 for mounting and fixing the motor, a first rotating shaft 132, a first flexible coupling 12 for reducing motor vibration interference, a second rotating shaft 15, and a second flexible coupling 14 for ensuring the alignment of the loading force. The first rotating shaft 132 is installed in the rolling bearing assembly 13 and is connected to the motor output shaft through the first flexible coupling 12. The second rotating shaft 15 is connected to the first rotating shaft 132 above through the second flexible coupling 14 and is rigidly connected to the transparent disk 5 below.

[0021] Furthermore, the rolling bearing assembly 13 includes a rolling bearing pair 133, a rolling bearing housing 134, and a retaining ring 131. The rolling bearing pair 133 includes two rolling bearings that are face-to-face mounted on the first rotating shaft 132. The retaining ring 131 mounts the rolling bearing pair 133 and the first rotating shaft 132 in the rolling bearing housing 134. The rolling bearing housing 134 is mounted on the load-bearing frame 3. Attached Figure Description

[0022] Figure 1 This is a three-dimensional view of an experimental apparatus for detecting the friction coefficient and cavitation phenomenon on the surface of a sliding bearing friction pair.

[0023] Figure 2 for Figure 1 A cross-sectional view (the camera component is not shown);

[0024] Figure 3 This is a cross-sectional view of the lubrication assembly;

[0025] Figure 4 This is a cross-sectional view of a rolling bearing assembly.

[0026] Figure 5 This is a cross-sectional view of the radial gas bearing working pair.

[0027] Figure 6 A cross-sectional view of the working pair of the thrust hydrostatic gas bearing;

[0028] Figure 7 This is a schematic diagram of the force transmission component.

[0029] In the attached diagram: 1. Rotating assembly: 11. Motor; 12. First flexible coupling; 13. Rolling bearing assembly: 131. Snap ring; 132. First rotating shaft; 133. Rolling bearing pair; 134. Rolling bearing seat; 14. Second flexible coupling; 15. Second rotating shaft; 2. Motor support frame; 3. Load-bearing frame; 4. Lubrication assembly: 41. Transparent oil cylinder; 411. Oil inlet; 412. Oil outlet; 413. Oil drain passage; 42. Transparent oil cylinder cover; 5. Transparent disc; 6. Experimental workpiece; 7. Force measuring assembly: 71. Pressure sensor; 72. Tension sensor; 73. Force transmission assembly: 731. T 732. Force measuring rod; 733. Steel wire; 734. Fixing clamp; 735. Pulley; 736. Counterweight; 8. Gas bearing assembly: 81. Thrust hydrostatic gas bearing; 82. Thrust hydrostatic bearing worktable; 83. Radial porous gas bearing; 84. Radial gas bearing seat; 85. Radial gas bearing support frame; 9. Loading assembly: 911. Lever; 912. Tray; 913. Hinge seat; 914. Pad; 92. Support assembly: 921. First support rod; 922. Second support rod; 923. Hydraulic cylinder support rod; 93. Clamp; 10. Shooting assembly: 101. High-speed camera; 102. Tripod. Detailed Implementation

[0030] The present invention will be further described below with reference to specific embodiments. However, it should be understood that the following specific embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention.

[0031] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0032] Example 1

[0033] like Figures 1 to 7 As shown in this embodiment, an experimental apparatus for detecting the surface friction coefficient and cavitation phenomenon of a sliding bearing friction pair can realistically simulate the rotational motion and friction process of the sliding bearing friction pair in oil lubrication. It can also accurately measure the friction coefficient and mechanical signals such as positive pressure load during the friction process to determine the quality of surface friction performance. In addition, it can also intuitively photograph and record the cavitation phenomenon during the lubrication process to study the influence of cavitation on lubrication performance.

[0034] An experimental apparatus for detecting the coefficient of friction and cavitation phenomenon on the surface of a sliding bearing friction pair includes a loading assembly 9 for providing load, a rotating assembly 1 for providing rotational motion, a gas bearing assembly 8 for transmitting frictional torque, a force measuring assembly 7 for measuring mechanical signals, a lubrication assembly 4 for providing oil lubrication, and a photographing assembly 10 for visually recording cavitation phenomena. The loading assembly 9 is connected to an experimental workpiece 6 at its end, and the rotating assembly 1 is connected to a transparent disk 5 at its end, located below the loading assembly 9. The experimental workpiece 6 rotates relative to the transparent disk 5, generating friction, and cavitation occurs after reaching a certain rotational speed. The gas bearing assembly 8 and the force measuring assembly 7 are both connected to the loading assembly 9. The lubrication assembly 4 is connected below the experimental workpiece 6. The photographing assembly 10 is mounted above the transparent disk 5.

[0035] This embodiment can be used to measure the friction coefficient of sliding bearing friction pairs and record cavitation phenomena during oil lubrication. In practice, the loading component 9 provides a certain load to the experimental workpiece 6, the rotating component 1 drives the transparent disk 5 to rotate, and the lubrication component 4 provides a certain amount of oil lubrication for this rotation. The transparent disk 5 and the experimental workpiece 6 rotate relative to each other and generate friction. The gas bearing component 8 completely transmits the mechanical signal generated during the friction process to the force measuring component 7 without introducing additional friction interference. The force measuring component 7 detects the mechanical signal generated during the friction process in real time. The imaging component 10, which is erected above the transparent disk 5, directly records the cavitation phenomenon generated during the lubrication process. It is suitable for measuring the friction coefficient of various sliding bearing friction pairs and analyzing the friction and lubrication performance. The experimental device is ingeniously designed, reasonably laid out, and has high testing accuracy.

[0036] like Figure 3 As shown, the lubrication assembly 4 includes a transparent oil cylinder 41 for storing lubricating oil and two transparent oil cylinder covers 42 to prevent oil splashing. The transparent oil cylinder covers 42 are placed above the transparent oil cylinder 41, and the transparent oil cylinder 41 is rigidly connected to the loading assembly 9. The transparent oil cylinder 41 has an oil inlet hole 411 and an oil outlet hole 412 for the flow of lubricating oil at its left and right ends, respectively. The height of the oil outlet hole 412 is higher than the upper surface of the experimental workpiece 6, and the height of the oil inlet hole 411 is higher than the height of the oil outlet hole 412. The bottom of the transparent oil cylinder 41 has an oil passage 413 for draining oil. In addition, a clamp 93 for fixing the experimental workpiece is also installed. The clamp 93 is installed in the center of the bottom of the transparent oil cylinder 41 by screws. During operation, the drain oil passage 413 is plugged with a plug, the oil pump pumps oil from the oil tank, and the oil flows in through the oil supply pipe from the oil inlet. After reaching the working oil level, the oil flows out from the oil outlet and flows back to the oil tank through the oil return pipe. When draining oil, the plug blocking the drain oil passage 413 is pulled out, and the oil flows back to the oil tank through the drain oil passage.

[0037] like Figure 2 As shown, in this embodiment, the rotating assembly 1 includes a motor 11 for providing rotational motion of the transparent disk 5, a motor support frame 2 for mounting and fixing the motor, a first rotating shaft 132, a first flexible coupling 12 for reducing motor vibration interference, a second rotating shaft 15, and a second flexible coupling 14 for ensuring the alignment of the loading force. The first rotating shaft 132 is mounted in the rolling bearing assembly 13 and connected to the motor output shaft via the first flexible coupling 12. The second rotating shaft 15 is connected to the first rotating shaft 132 at the top via the second flexible coupling 14, and is rigidly connected to the transparent disk 5 at the bottom via screws. Figure 4 As shown, the rolling bearing assembly 13 includes a rolling bearing pair 133, a rolling bearing housing 134, and a retaining ring 131. The rolling bearing pair 133 includes two rolling bearings face-to-face mounted on the first rotating shaft 132. The retaining ring 131 mounts the rolling bearing pair 133 and the first rotating shaft 132 in the rolling bearing housing 134, which is mounted on the load-bearing frame 3. During implementation, the motor 11 operates, and the motor output shaft drives the first rotating shaft 132 to rotate via the first flexible coupling 12. The first rotating shaft 132 then drives the second rotating shaft 15 and the transparent disk 5 to rotate via the second flexible coupling 14. It should be noted that in this embodiment, the first flexible coupling 12 is a claw-shaped or cross-shaped flexible coupling, which allows a certain amount of radial deviation and angular deviation, and has the function of vibration reduction and energy absorption, which can reduce the interference of motor vibration; the second flexible coupling 14 is a rubber flexible coupling with high vibration reduction capacity, which allows a certain amount of radial deviation, axial deviation and angular deviation, which can ensure the centering of the loading force, and has the function of vibration reduction and energy absorption, which can reduce the interference of motor vibration; the motor 11 can be a DC servo motor and the speed of the motor can be steplessly adjusted according to the needs of the working conditions, and the rolling bearing pair 133 can be a tapered roller bearing.

[0038] The loading assembly 9 includes a lever 911, a tray 912 hinged to the counterweight end of the lever for supporting weights, a support assembly 92 hinged to the loading end of the lever for transmitting radial loads, a load-bearing platform 3, and a hinge seat 913 and a pad 914 with a limiting groove installed at the bottom of the load-bearing platform. The lever 911 and the hinge seat 913 are hinged to the lever fulcrum hole. The loading end of the lever 911 is placed above the limiting groove of the pad 914. The limiting groove of the pad 914 is used to limit the left and right swing of the lever 911 and keep it horizontal during unloading. In practice, a certain weight is placed on the lever tray 912. The lever 911 amplifies the load of the weight and transmits the load to the support assembly 92 above the lever 911. The other end of the lever 911 is placed above the limiting groove of the pad 914. During loading, it can limit the left and right swaying, and during unloading, it can provide support to keep the lever 911 horizontal.

[0039] The support assembly 92 includes a first support rod 921, a second support rod 922, and a hydraulic cylinder support rod 923 for transmitting radial loads. The first support rod 921 is hinged to one end of a lever 911 at its lower end. The second support rod 922 is connected to a thrust hydrostatic bearing worktable 82 at its upper end. The first support rod 921 and the second support rod 922 are connected by a pressure sensor 71. The hydraulic cylinder support rod 923 is rigidly connected to a thrust hydrostatic gas bearing 81 at its lower end by a thread, and rigidly connected to the bottom of a transparent hydraulic cylinder 41 at its upper end by bolts. Its horizontal displacement is limited by a radial porous gas bearing 83. The radial gas bearing seat 84 is fixedly installed on a radial gas bearing support frame 85, and the radial gas bearing support frame 85 is installed on a load-bearing frame 3. During implementation, lever 911 transmits the load to the first support rod 921. The first support rod 921, pressure sensor 71, second support rod 922, and thrust hydrostatic bearing worktable 82 constitute the first vertical rigid transmission chain. The thrust hydrostatic gas bearing 81, hydraulic cylinder support rod 923, transparent hydraulic cylinder 41, clamp 93, and experimental workpiece 6 constitute the second vertical rigid transmission chain. The transparent disk 5, second rotating shaft 15, second elastic coupling 14, first rotating shaft 132, rolling bearing assembly 13, and load-bearing frame 3 constitute the third transmission chain. The first and second transmission chains are connected by the thrust hydrostatic gas bearing workpiece pair, transmitting the load to the friction test workpiece pair between the experimental workpiece 6 and the transparent disk 5. Pressure sensor 71 transmits the collected radial load to the monitoring system for display in real time. The load is transmitted to the load-bearing frame 3 through the third transmission chain, forming a closed loop of force transmission, preventing the motor 11 from directly bearing the radial load.

[0040] like Figure 5 , 6 As shown, the radial porous gas bearing 83 and the hydraulic cylinder support rod 923 cooperate to form a radial gas bearing working pair. The radial gas bearing working pair uses gas as a suspension medium, allowing the hydraulic cylinder support rod 923 to rotate freely without introducing additional friction. The thrust hydrostatic gas bearing 81 is placed above the thrust hydrostatic bearing working table 82 to form a thrust hydrostatic gas bearing working pair. The thrust hydrostatic gas bearing working pair uses gas as a suspension medium and can rotate together with the experimental workpiece 6 without introducing additional friction.

[0041] like Figure 7As shown, the thrust hydrostatic gas bearing 81 is connected to a force transmission assembly 73 on its side. The force transmission assembly 73 includes a T-shaped force measuring rod 731, a pulley 734, a counterweight 735, and two fixed clamping plates 733. One end of the T-shaped force measuring rod 731 is connected to one end of a tension sensor 72 via a steel wire 732. The other end of the tension sensor 72 is connected to the fixed clamping plate 733 via a steel wire 732. The other end of the T-shaped force measuring rod 731 is connected to the counterweight 735 via a steel wire 732 and a pulley 734. The pulley 734 is mounted on the other fixed clamping plate 733. The fixed clamping plate 733 is mounted on a radial gas bearing support frame 85. The radial gas bearing support frame 85 is fixedly mounted on a load-bearing frame 3. During implementation, the counterweight 735 provides a preload to the tension sensor 72 via the steel wire 732, keeping the force transmission component 73 balanced. The transparent disk 5 and the experimental workpiece 6 rotate relative to each other under oil lubrication and generate friction. The second vertical rigid transmission chain generates a relative motion tendency under the influence of friction torque. The T-shaped force measuring rod 731 transmits the tangential force generated by friction to the tension sensor 72 via the steel wire 732. The tension sensor 72 transmits the collected tangential force to the monitoring system in real time. After mechanical calculation processing, the corresponding friction coefficient can be displayed.

[0042] In this embodiment, the imaging assembly 10 includes a high-speed camera 101 for capturing and recording cavitation phenomena and a tripod 102 for supporting the high-speed camera. During implementation, a certain rotational speed and load are set to induce cavitation in the friction pair formed by the experimental workpiece 6 and the transparent disk 5 during oil lubrication. The high-speed camera 101 is placed above the transparent disk 5 via the tripod 102, and the captured cavitation phenomena are transmitted to the monitoring system for display.

[0043] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An experimental apparatus for detecting the coefficient of friction and cavitation phenomena on the surface of a sliding bearing friction pair, characterized in that, The system includes a loading assembly (9) that provides load, a rotating assembly (1) that provides rotational motion, a gas bearing assembly (8) that transmits frictional torque, a force measuring assembly (7) that measures mechanical signals, a lubrication assembly (4) that provides oil lubrication, and a camera assembly (10) that visually records cavitation phenomena. The loading assembly (9) is connected to an experimental workpiece (6) at one end, and the rotating assembly (1) is connected to a transparent disk (5) at one end. The rotating assembly (1) is located above the loading assembly (9). The experimental workpiece (6) rotates relative to the transparent disk (5) and generates friction. Cavitation occurs after reaching a certain speed. The gas bearing assembly (8) and the force measuring assembly (7) are both connected in the loading assembly (9). The lubrication assembly (4) is connected below the experimental workpiece (6). The camera assembly (10) is mounted above the transparent disk (5). The loading assembly (9) includes a lever (911), a tray (912) hinged to the counterweight end of the lever for holding weights, and a support assembly (92) hinged to the loading end of the lever for transmitting radial loads; the support assembly (92) includes a first support rod (921), a second support rod (922), and a hydraulic cylinder support rod (923) for transmitting radial loads; the first support rod (921) is hinged to one end of the lever (911) below; The force measuring component (7) includes a pressure sensor (71) for detecting the applied force, a tension sensor (72) for detecting the tangential friction force, and a force transmission component (73) for transmitting the tangential friction force. The data detected by the pressure sensor (71) and the tension sensor (72) are transmitted to the signal acquisition system. The gas bearing assembly (8) includes a thrust hydrostatic gas bearing (81), a thrust hydrostatic bearing worktable (82) for placing the thrust hydrostatic gas bearing, a radial porous gas bearing (83), and a radial gas bearing seat (84) for mounting and fixing the radial porous gas bearing. The radial gas bearing seat is fixedly installed on the radial gas bearing support frame (85). The second support rod (922) is connected to the thrust hydrostatic bearing worktable (82) above. The first support rod (921) and the second support rod (922) are connected through a pressure sensor (71). The cylinder support rod (923) is rigidly connected to the thrust hydrostatic gas bearing (81) below and to the bottom of the transparent cylinder (41) above, and its horizontal displacement is limited by the radial porous gas bearing (83). The thrust hydrostatic gas bearing (81) is connected to the force transmission assembly (73) on its side. The lubrication assembly (4) includes a transparent oil cylinder (41) for storing lubricating oil and two transparent oil cylinder covers (42) to prevent oil splashing. The transparent oil cylinder covers (42) are placed above the transparent oil cylinder (41), and the transparent oil cylinder (41) is rigidly connected to the loading assembly (9). The shooting assembly (10) includes a high-speed camera (101) for shooting and recording cavitation phenomena and a tripod (102) for supporting the high-speed camera.

2. The experimental apparatus for detecting the friction coefficient and cavitation phenomenon of a sliding bearing friction pair according to claim 1, characterized in that, The loading assembly (9) also includes a load-bearing platform (3) and a hinge (913) and a pad (914) with a limiting groove installed at the bottom of the load-bearing platform. The lever (911) is hinged to the hinge (913) at the lever fulcrum hole. The loading end of the lever (911) is placed above the limiting groove of the pad (914). The limiting groove of the pad (914) is used to limit the left and right swing of the lever (911) and keep it horizontal during unloading.

3. The experimental apparatus for detecting the friction coefficient and cavitation phenomenon of a sliding bearing friction pair according to claim 2, characterized in that, The radial porous gas bearing (83) and the cylinder support rod (923) cooperate to form a radial gas bearing working pair. The radial gas bearing working pair uses gas as a suspension medium, so that the cylinder support rod (923) can rotate freely without introducing additional friction.

4. The experimental apparatus for detecting the friction coefficient and cavitation phenomenon of a sliding bearing friction pair according to claim 3, characterized in that, The transparent oil cylinder (41) has an oil inlet (411) and an oil outlet (412) for the flow of lubricating oil at its left and right ends, respectively, and an oil passage (413) for draining oil at its bottom. A clamp (93) for fixing the experimental workpiece is installed at the bottom of the transparent oil cylinder.

5. The experimental apparatus for detecting the friction coefficient and cavitation phenomenon of a sliding bearing friction pair according to claim 4, characterized in that, The transparent disk (5) and the experimental workpiece (6) rotate relative to each other in the oil cylinder (41) and generate friction. The experimental workpiece (6), the clamp (93), the transparent oil cylinder (41), the oil cylinder support rod (923) are rigidly connected to the thrust hydrostatic gas bearing (81) and generate a relative motion tendency under the drive of friction torque.

6. The experimental apparatus for detecting the friction coefficient and cavitation phenomenon of a sliding bearing friction pair according to claim 5, characterized in that, The thrust hydrostatic gas bearing (81) is placed above the thrust hydrostatic bearing worktable (82) to form a thrust hydrostatic gas bearing working pair. The thrust hydrostatic gas bearing working pair uses gas as a suspension medium and can rotate together with the experimental workpiece (6) without introducing additional friction.

7. The experimental apparatus for detecting the friction coefficient and cavitation phenomenon of a sliding bearing friction pair according to claim 6, characterized in that, The force transmission assembly (73) includes a T-shaped force measuring rod (731), a pulley (734), a counterweight (735), and two fixed clamping plates (733). One end of the T-shaped force measuring rod (731) is connected to one end of a tension sensor (72) via a steel wire (732), and the other end of the tension sensor (72) is connected to the fixed clamping plate (733) via a steel wire (732). The other end of the T-shaped force measuring rod (731) is connected to the counterweight (735) via a pulley (734) via a steel wire (732). The pulley (734) is installed on the other fixed clamping plate (733), and the fixed clamping plate (733) is installed on a radial gas bearing support frame (85). The radial gas bearing support frame (85) is fixedly installed on a load-bearing frame (3).

8. The experimental apparatus for detecting the friction coefficient and cavitation phenomenon of a sliding bearing friction pair according to claim 1, characterized in that, The rotating assembly (1) includes a motor (11) for providing the rotational motion of the transparent disk, a motor support frame (2) for mounting and fixing the motor, a first rotating shaft (132), a first flexible coupling (12) for reducing motor vibration interference, a second rotating shaft (15), and a second flexible coupling (14) for ensuring the alignment of the loading force. The first rotating shaft (132) is installed in the rolling bearing assembly (13) and connected to the motor output shaft through the first flexible coupling (12). The second rotating shaft (15) is connected to the first rotating shaft (132) above through the second flexible coupling (14) and is rigidly connected to the transparent disk (5) below.

9. The experimental apparatus for detecting the friction coefficient and cavitation phenomenon of a sliding bearing friction pair according to claim 8, characterized in that, The rolling bearing assembly (13) includes a pair of rolling bearings (133), a rolling bearing housing (134), and a retaining ring (131). The pair of rolling bearings (133) includes two rolling bearings that are mounted face-to-face on a first rotating shaft (132). The retaining ring (131) mounts the pair of rolling bearings (133) and the first rotating shaft (132) in the rolling bearing housing (134). The rolling bearing housing (134) is mounted on a load-bearing frame (3).

Images