A coefficient of friction testing device

Abstract

The utility model provides a kind of coefficient of friction testing device, it is related to rubber wheel testing equipment field, including rack, jacking mechanism and rotary drive mechanism, by jacking mechanism to the measured wheel is accurately adjusted and is applied to the positive pressure, simulates the load condition when rubber wheel actual walking;While using rotary drive mechanism to drive the measured wheel rotation, real restoration rubber wheel in the stress state in rolling process, and then realize high simulation real working condition;Pressure sensor is set in jacking mechanism, real-time monitoring positive pressure;Torque sensor is integrated in rotary drive mechanism, accurately measure driving torque, can in one experiment in succession obtain the measured wheel is in the maximum static friction torque and dynamic friction torque under the stationary state and the rotated state of soon rotating, and then respectively calculate out static friction coefficient and dynamic friction coefficient, realize integrated high-precision sensing measurement, realize static / dynamic friction coefficient integrated test.

Description

Technical Field

[0001] This utility model relates to the field of rubber wheel testing equipment, and in particular to a friction coefficient testing device. Background Technology

[0002] The coefficient of friction is a key physical parameter that measures the magnitude of friction between a rubber roller and its contact surface. It directly affects the traction performance, braking effect, wear resistance, and safety of the rubber roller in practical applications. Accurate and reliable testing of the static and dynamic coefficients of friction is crucial in the production and quality control of various rubber rollers.

[0003] Currently, common methods for testing the coefficient of friction mostly employ the principles of flat plate sliding or pendulum. However, these traditional methods have significant limitations when testing rubber wheels. First, the flat plate sliding method struggles to simulate the continuous rotational motion of a rubber wheel in actual use, failing to effectively distinguish and measure the static friction coefficient (at the moment of startup) from the dynamic friction coefficient (during continuous rolling), resulting in deviations between the test results and actual working conditions. Second, the pendulum method is more suitable for measuring instantaneous impact friction and struggles to accurately quantify stable rolling friction processes. Furthermore, many existing testing devices lack sufficient precision in controlling and measuring the loading pressure, failing to achieve stable, precise, and continuously adjustable normal pressure loading. Since normal pressure is a fundamental parameter for calculating friction, its control precision directly affects the accuracy of the final results. Therefore, solving these problems has become a pressing issue for those skilled in the art. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a friction coefficient testing device. This patent applies a precisely adjustable positive pressure to the wheel under test through a lifting mechanism to simulate the load conditions when the rubber wheel is actually walking; at the same time, it uses a rotary drive mechanism to drive the wheel under test to rotate, so as to truly restore the force state of the rubber wheel during the rolling process, thereby achieving a high degree of simulation of real working conditions.

[0005] This utility model is achieved through the following technical solution: A friction coefficient testing device includes a frame, a lifting mechanism, and a rotary drive mechanism. The lifting mechanism and the rotary drive mechanism are fixedly connected to the frame. The lifting mechanism is located below the rotary drive mechanism and is used to apply positive pressure to the wheel under test. The lifting mechanism includes a lifting component and a friction plate. The lifting component drives the friction plate to adjust up and down. A pressure sensor is provided between the friction plate and the floating end of the lifting component. The rotary drive mechanism includes a rotating component and a transmission component. The rotating component drives the wheel under test through the transmission component, and the wheel under test abuts against the friction surface of the friction plate.

[0006] The lifting mechanism of this patent is used to apply a positive pressure to the wheel under test, simulating the positive pressure experienced by a rubber wheel during movement. The rotary drive mechanism is used to apply a rotational torque to the wheel under test, so that the wheel under test is subjected to both the positive pressure applied by the lifting mechanism and the rotational torque of the rotary drive mechanism. The wheel under test can be tested in two states: a stationary state about to rotate and a state that has already rotated. When the wheel under test is in the state about to rotate, the torque applied by the rotary drive mechanism has reached its maximum value under the constant force applied by the lifting mechanism, and the static friction coefficient can be calculated at this time. When the wheel under test is in the state that has already rotated, the torque applied by the rotary drive mechanism is the torque value of the wheel under test during rolling friction under the constant force applied by the lifting mechanism, and the dynamic friction coefficient can be calculated at this time.

[0007] According to the above technical solution, preferably, the frame includes a support frame and multiple sets of vertically arranged guide columns, and the guide columns are fixedly connected to the support frame.

[0008] According to the above technical solution, preferably, the lifting assembly includes a support plate, a lifting motor, a reducer unit, a lifting column, and a loading plate. The support plate is fixedly connected to the frame. The lifting motor and the reducer unit are both fixed on the support plate. The upper end of the lifting column is fixedly connected to the lower surface of the loading plate. The loading plate is slidably connected to the guide column. The lifting motor drives the lifting column and the loading plate to move up and down through the reducer unit. A pressure sensor is installed on the loading plate. The sensing end of the pressure sensor abuts against the friction plate. The friction plate is detachably fixed in the middle of the operating plate. The operating plate is slidably connected to the guide column.

[0009] According to the above technical solution, preferably, the reducer unit includes a planetary reducer and a worm gear reducer connected in series. The input end of the planetary reducer is connected to the output end of the lifting motor, the output end of the planetary reducer is connected to the input end of the worm gear reducer, and the output end of the worm gear reducer is connected to the lifting column.

[0010] According to the above technical solution, preferably, the rotating component includes a rotating motor and a rotating reducer, both of which are fixedly connected to the frame, and the rotating motor drives the transmission component through the rotating reducer.

[0011] According to the above technical solution, preferably, the transmission assembly includes a first coupling, a torque sensor, a second coupling, and an output shaft connected in series. A rotary motor drives the input end of the first coupling through a rotary reducer. The output end of the first coupling is connected to the input end of the torque sensor. The output end of the torque sensor is connected to the input end of the second coupling. The output end of the second coupling is connected to the output shaft. The wheel under test is coaxially and detachably fixedly connected to the output shaft. The central axes of the first coupling, the torque sensor, the second coupling, and the output shaft coincide.

[0012] According to the above technical solution, preferably, the friction plate has a groove-shaped structure, and the bottom surface of the friction plate is the friction surface that contacts the wheel being tested.

[0013] The beneficial effects of this utility model are: (1) This patent applies a precisely adjustable positive pressure to the test wheel through a lifting mechanism to simulate the load conditions when the rubber wheel is actually walking; at the same time, it uses a rotary drive mechanism to drive the test wheel to rotate, which truly restores the force state of the rubber wheel during the rolling process. This effectively overcomes the shortcomings of traditional flat plate sliding method or pendulum method, which cannot simulate continuous rotational motion and are difficult to distinguish between static and dynamic friction coefficients. Thus, it achieves a high degree of simulation of real working conditions, and the test results are accurate and reliable. (2) The device is equipped with a pressure sensor in the lifting mechanism to monitor the positive pressure in real time; and a torque sensor is integrated in the rotary drive mechanism to accurately measure the drive torque. By continuously applying positive pressure and rotational torque in the same test process, the maximum static friction torque and dynamic friction torque of the tested wheel in the "stationary state about to rotate" and "rotated state" can be obtained in one experiment. Then, the static friction coefficient and dynamic friction coefficient can be calculated respectively, realizing integrated high-precision sensing measurement and realizing integrated testing of static / dynamic friction coefficients. Attached Figure Description

[0014] Figure 1 A schematic diagram of an isometric structure according to an embodiment of the present invention is shown; Figure 2 A schematic diagram of the equiaxed side structure of the lifting mechanism according to an embodiment of the present invention is shown; Figure 3 A schematic diagram of another isometric structure of the lifting mechanism according to an embodiment of the present invention is shown; Figure 4 A schematic diagram of the equiaxed side structure of the rotary drive mechanism according to an embodiment of the present invention is shown; Explanation of reference numerals in the attached figures: 1. Frame; 2. Lifting mechanism; 3. Rotary drive mechanism; 4. Lifting assembly; 5. Friction plate; 6. Pressure sensor; 7. Rotary assembly; 8. Transmission assembly; 9. Test wheel; 10. Support frame; 11. Guide column; 12. Support plate; 13. Lifting motor; 14. Reducer unit; 15. Lifting column; 16. Loading plate; 17. Rotary motor; 18. Rotary reducer; 19. First coupling; 20. Torque sensor; 21. Second coupling; 22. Planetary reducer; 23. Worm gear reducer; 24. Output shaft; 25. Operation panel. Detailed Implementation

[0015] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and preferred embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0016] In the description of the utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0017] As shown in the figure, this utility model provides a friction coefficient testing device, including a frame 1, a lifting mechanism 2, and a rotary drive mechanism 3. The lifting mechanism 2 and the rotary drive mechanism 3 are fixedly connected to the frame 1. The lifting mechanism 2 is arranged below the rotary drive mechanism 3 and is used to apply positive pressure to the wheel 9 being tested. The lifting mechanism 2 includes a lifting assembly 4 and a friction plate 5. The lifting assembly 4 drives the friction plate 5 to adjust up and down. A pressure sensor 6 is provided between the friction plate 5 and the floating end of the lifting assembly 4. The rotary drive mechanism 3 includes a rotating assembly 7 and a transmission assembly 8. The rotating assembly 7... The transmission assembly 8 drives the test wheel 9, which abuts against the friction surface of the friction plate 5. The frame 1 includes a support frame 10 and multiple sets of vertically arranged guide columns 11, which are fixedly connected to the support frame 10. The lifting assembly 4 includes a support plate 12, a lifting motor 13, a reducer unit 14, a lifting column 15, and a loading plate 16. The support plate 12 is fixedly connected to the frame 1. The lifting motor 13 and the reducer unit 14 are both fixed on the support plate 12. The upper end of the lifting column 15 is fixedly connected to the lower surface of the loading plate 16, and the loading plate 16 slides against the guide column 11. The lifting motor 13 drives the lifting column 15 and loading plate 16 to move up and down through the reducer unit 14. The pressure sensor 6 is installed on the loading plate 16, and the sensing end of the pressure sensor 6 abuts against the friction plate 5. The friction plate 5 is detachably fixed in the middle of the operating plate 25. The operating plate 25 is slidably connected to the guide column 11. The rotating assembly 7 includes a rotating motor 17 and a rotating reducer 18. Both the rotating motor 17 and the rotating reducer 18 are fixedly connected to the frame 1. The rotating motor 17 drives the transmission assembly 8 through the rotating reducer 18. The transmission assembly 8 includes a first link connected in series. The system includes a first coupling 19, a torque sensor 20, a second coupling 21, and an output shaft 24. A rotary motor 17 drives the input end of the first coupling 19 through a rotary reducer 18. The output end of the first coupling 19 is connected to the input end of the torque sensor 20. The output end of the torque sensor 20 is connected to the input end of the second coupling 21. The output end of the second coupling 21 is connected to the output shaft 24. The measured wheel 9 is coaxially and detachably fixedly connected to the output shaft 24. The central axes of the first coupling 19, the torque sensor 20, the second coupling 21, and the output shaft 24 coincide.

[0018] The lifting mechanism 2 of this patent is used to apply a positive pressure to the tested wheel 9, simulating the positive pressure experienced by a rubber wheel when it is moving. The rotary drive mechanism 3 is used to apply a rotational torque to the tested wheel 9, so that the tested wheel 9 is subjected to the rotational torque of the rotary drive mechanism 3 while the positive pressure is applied by the lifting mechanism 2. The tested wheel 9 can be tested in two states: a stationary state about to rotate and a state that has already rotated. When the tested wheel 9 is in the state about to rotate, the torque applied by the rotary drive mechanism 3 has reached its maximum value under the constant force applied by the lifting mechanism 2, and the static friction coefficient can be calculated at this time. When the tested wheel 9 is in the state that has already rotated, the torque applied by the rotary drive mechanism 3 is the torque value of the tested wheel 9 during rolling friction under the constant force applied by the lifting mechanism 2, and the dynamic friction coefficient can be calculated at this time.

[0019] This patented device features a high degree of integration. A lifting mechanism 2 applies precisely adjustable positive pressure to the tested wheel 9, simulating the load conditions of a rubber wheel during actual movement. Simultaneously, a rotary drive mechanism 3 drives the tested wheel 9 to rotate, realistically replicating the force state of the rubber wheel during rolling. This effectively overcomes the shortcomings of traditional flat plate sliding or pendulum methods, which cannot simulate continuous rotational motion and are difficult to distinguish between static and dynamic friction coefficients. This results in a high degree of simulation of real-world working conditions and accurate, reliable test results. The device incorporates a pressure sensor 6 in the lifting mechanism 2 to monitor the positive pressure in real time. A torque sensor 20 is integrated into the rotary drive mechanism 3 to accurately measure the driving torque. By continuously applying positive pressure and rotational torque during the same test, the maximum static and dynamic friction torques of the tested wheel 9 in both the "stationary state before rotation" and "rotated state" can be obtained in a single experiment. The static and dynamic friction coefficients can then be calculated separately, achieving integrated high-precision sensing measurement and unified testing of static and dynamic friction coefficients.

[0020] Optionally, in one possible implementation, the reducer unit 14 includes a planetary reducer 22 and a worm gear reducer 23 connected in series. The input end of the planetary reducer 22 is connected to the output end of the lifting motor 13, the output end of the planetary reducer 22 is connected to the input end of the worm gear reducer 23, and the output end of the worm gear reducer 23 is connected to the lifting column 15.

[0021] Optionally, in one possible implementation, the friction plate 5 has a groove-shaped structure, and the bottom surface of the friction plate 5 is the friction surface that contacts the wheel 9 being tested. The friction plate 5 can be tested by changing the working conditions and the applied pressure value of the groove surface of the friction plate 5 through different media such as oil spraying and water spraying to test the coefficient of friction when the wheel 9 being tested contacts a plane with different working conditions and different materials.

[0022] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A friction coefficient testing device, characterized in that, The device includes a frame, a lifting mechanism, and a rotary drive mechanism. The lifting mechanism and the rotary drive mechanism are fixedly connected to the frame. The lifting mechanism is located below the rotary drive mechanism and is used to apply positive pressure to the wheel being tested. The lifting mechanism includes a lifting assembly and a friction plate. The lifting assembly drives the friction plate to adjust up and down. A pressure sensor is provided between the friction plate and the floating end of the lifting assembly. The rotary drive mechanism includes a rotating assembly and a transmission assembly. The rotating assembly drives the wheel being tested through the transmission assembly, and the wheel being tested abuts against the friction surface of the friction plate.

2. The friction coefficient testing device according to claim 1, characterized in that, The frame includes a support frame and multiple sets of vertically arranged guide columns, which are fixedly connected to the support frame.

3. The friction coefficient testing device according to claim 2, characterized in that, The lifting assembly includes a support plate, a lifting motor, a reducer unit, a lifting column, and a loading plate. The support plate is fixedly connected to the frame. The lifting motor and the reducer unit are both fixed on the support plate. The upper end of the lifting column is fixedly connected to the lower surface of the loading plate. The loading plate is slidably connected to the guide column. The lifting motor drives the lifting column and the loading plate to move up and down through the reducer unit. The pressure sensor is installed on the loading plate, and the sensing end of the pressure sensor abuts against a friction plate. The friction plate is detachably fixed in the middle of the operating plate. The operating plate is slidably connected to the guide column.

4. The friction coefficient testing device according to claim 3, characterized in that, The reducer unit includes a planetary reducer and a worm gear reducer connected in series. The input end of the planetary reducer is connected to the output end of the lifting motor, the output end of the planetary reducer is connected to the input end of the worm gear reducer, and the output end of the worm gear reducer is connected to the lifting column.

5. The friction coefficient testing device according to claim 1, characterized in that, The rotating assembly includes a rotary motor and a rotary reducer, both of which are fixedly connected to the frame. The rotary motor drives the transmission assembly through the rotary reducer.

6. The friction coefficient testing device according to claim 5, characterized in that, The transmission assembly includes a first coupling, a torque sensor, a second coupling, and an output shaft connected in series. The rotary motor drives the input end of the first coupling through a rotary reducer. The output end of the first coupling is connected to the input end of the torque sensor. The output end of the torque sensor is connected to the input end of the second coupling. The output end of the second coupling is connected to the output shaft. The wheel under test is coaxially and detachably fixedly connected to the output shaft. The central axes of the first coupling, the torque sensor, the second coupling, and the output shaft coincide.

7. The friction coefficient testing device according to claim 1, characterized in that, The friction plate has a groove-shaped structure, and the bottom surface of the friction plate is the friction surface that contacts the wheel being tested.

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