A multifunctional friction test bench based on compression-torsion combined action

Abstract

The present application relates to the technical field of material tribological performance test, and discloses a multifunctional friction test bench based on compression-torsion combined action, which comprises a main frame, a work platform, a vertical loading beam, a rotating transition beam, a compression-torsion panel and a compression-torsion combined actuator, the top of the main frame is provided with a fixed beam, the work platform is arranged at the bottom of the main frame, the vertical loading beam is located below the fixed beam, a vertical servo actuator is connected between the vertical loading beam and the fixed beam, the rotating transition beam is connected below the vertical loading beam, the compression-torsion combined actuator is located at one side of the main frame and is connected with the rotating transition beam through a transmission shaft.The present application can realize the composite loading of compression and torsion at the same time, realize the compression-torsion loading of the structure through the movement of the compression-torsion combined actuator, accurately simulate the friction and wear characteristics under the complex stress state, and is suitable for the research on the mechanical and friction performance of materials and structures under the condition of multi-dimensional stress.

Description

Technical Field

[0001] This invention relates to the field of tribological performance testing technology for materials, specifically to a multifunctional friction test bench based on compression-torsion compound action. Background Technology

[0002] In engineering practice, many mechanical structural components are subjected to complex stress states, including combinations of various loads such as compression, torsion, and tension. Under these complex stress conditions, the friction and wear behavior of materials differs from that under single stress conditions. Therefore, a friction testing device capable of simulating complex stress conditions is needed. Currently, traditional friction testing equipment is mostly limited to single compression or tensile loading, which cannot meet the testing requirements under complex conditions. Summary of the Invention

[0003] The technical problem to be solved by this invention is that existing friction testing equipment is mostly limited to single compression or tensile loading, which cannot meet the testing requirements under complex conditions.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is to provide a multifunctional friction test bench based on pressure-torsion compound action, including a main frame, a working platform, a vertical loading beam, a rotary transition beam, a pressure-torsion panel, and a pressure-torsion compound actuator. The main frame consists of two vertically arranged columns, with a fixed crossbeam at the top between the two columns. The working platform is connected to the bottom of the two columns. The vertical loading beam is located below the fixed crossbeam and parallel to it. A vertical servo actuator is connected between the vertical loading beam and the fixed crossbeam. The rotary transition beam is connected below the vertical loading beam, and a pressure-torsion panel is located below the rotary transition beam. The pressure-torsion compound actuator is located on one side of the main frame. A ball joint or universal coupling is provided inside the rotary transition beam. The pressure-torsion compound actuator is connected to the rotary transition beam via a drive shaft.

[0005] Optionally, the fixed crossbeam is equipped with a servo cylinder connected to a vertical servo actuator. The servo cylinder is externally connected to a constant pressure servo oil source. A vertical servo actuator is also provided inside the rotary transition beam. The output end of the vertical servo actuator is connected to the pressure and torque panel, and the input end is connected to the servo cylinder.

[0006] Optionally, a loading beam sleeve is fixedly connected inside the vertical loading beam. The lower end of the loading beam sleeve extends out of the vertical loading beam and is connected to a loading beam pad. The lower end of the loading beam pad is connected to a rotating transition beam, which is perpendicular to the vertical loading beam.

[0007] Optionally, a linear guide seat is provided between the pressure-torsion panel and the rotary transition beam. The linear guide seat includes a linear guide rail and a slider. The linear guide rail is located at the bottom of the rotary transition beam, and the slider is connected to the top of the pressure-torsion panel. The slider can slide along the linear guide rail, and the linear guide rail is parallel to the rotary transition beam.

[0008] Optionally, a vertical displacement sensor is also included. A sleeve is provided inside the fixed crossbeam, and a fixing pad is provided below the sleeve. The upper end of the vertical servo actuator passes through the fixing pad and the sleeve. The fixed crossbeam, the vertical servo actuator, the sleeve, and the fixing pad all have screw holes. The fixed crossbeam, the vertical servo actuator, the sleeve, and the fixing pad are fixed by at least one fixing bolt passing through the screw holes. The vertical displacement sensor is connected to the upper end of the vertical servo actuator and fixed to the fixed crossbeam.

[0009] Optionally, a vertical displacement sensor is also included. A sleeve is provided inside the fixed crossbeam, and a fixed pad is provided below the sleeve. The upper end of the vertical servo actuator passes through the fixed pad and the sleeve. The vertical servo actuator, the sleeve, and the fixed pad all have screw holes. The vertical servo actuator, the sleeve, and the fixed pad are fixed by at least one fixing bolt passing through the screw holes. A second linear guide rail is provided inside the fixed crossbeam, and a second slider is provided on the second linear guide rail. The upper end of the fixing bolt is connected to the second slider. The lower end of the fixed crossbeam is hollowed out, and the second slider can slide along the second linear guide rail, so that the vertical servo actuator, the sleeve, and the fixed pad can move inside the fixed crossbeam. The vertical displacement sensor is connected to the upper end of the second slider.

[0010] Optionally, a multi-channel control system is also included. The multi-channel control system is located on the side of the main frame and includes a programmable controller, a human-machine interface, a data acquisition module, and an analog / digital input / output interface. The multi-channel control system is connected to a constant pressure servo oil source, a servo cylinder, a vertical servo actuator, and a vertical displacement sensor via wired connection.

[0011] Optionally, the vertical loading beam is provided with multiple clamping wheels, which are respectively located at the four corners on both sides of the vertical loading beam.

[0012] Optionally, the clamping wheel includes a clamping wheel housing, a clamping wheel body, and a clamping wheel ball bearing. The clamping wheel housing is welded to the vertical loading beam. A connecting shaft is provided on the end of the clamping wheel away from the vertical loading beam. The clamping wheel ball bearing is sleeved on the connecting shaft. The clamping wheel body is located outside the clamping wheel ball bearing.

[0013] Optionally, the work platform is provided with a dedicated fixture mounting slot.

[0014] In summary, the present invention has at least one of the following beneficial effects:

[0015] 1. The present invention is a multifunctional friction test bench based on compression-torsion compound action, which can simultaneously realize the compound loading of compression and torsion. Through the movement of the compression-torsion compound actuator, compression-torsion loading is realized on the structure, which can accurately simulate the friction and wear characteristics under complex stress conditions. It is suitable for studying the mechanical and frictional properties of materials and structures under multidimensional stress conditions.

[0016] 2. The test bench of this invention features high precision, multi-channel collaborative control, and flexible adjustment. Through precise control and multi-channel collaborative operation, the test bench can provide high-precision test results under multi-dimensional stress environment, and is particularly suitable for aerospace, mechanical manufacturing and other fields.

[0017] 3. The device of this invention has a compact structure and complete functions. The modular design of the device facilitates installation and maintenance, and it is easy to operate and highly stable, which reduces the use and maintenance costs of the test equipment. The combined design of the vertical servo actuator with the fixed crossbeam and loading beam improves the loading efficiency of the system and ensures the reliability of operation under high stress conditions. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the multifunctional friction test bench based on the compression-torsion compound action of the present invention;

[0019] Figure 2 This is a schematic diagram of the connection structure between the vertical displacement sensor and the vertical servo actuator in this invention;

[0020] Figure 3 This is a schematic diagram of the clamping wheel structure of the present invention;

[0021] Figure 4 This is a schematic diagram showing the detailed structure of the rotating transition beam of the present invention;

[0022] In the diagram: 1. Vertical displacement sensor; 2. Fixed crossbeam; 3. Vertical servo actuator; 4. Clamping wheel; 5. Vertical loading beam; 6. Rotary transition beam; 8. Working platform; 9. Fixing bolt; 10. Sleeve; 11. Fixing pad; 12. Loading beam sleeve; 13. Loading beam pad; 14. Main frame; 15. Clamping wheel housing; 16. Clamping wheel; 17. Clamping wheel ball bearing; 18. Pressure and torsion panel. Detailed Implementation

[0023] The following combination Figure 1-4 The present invention will be described in further detail below.

[0024] This invention discloses a multifunctional friction testing rig based on compressive-torsional combined action. By combining axial compression and torsional loads, it enables systematic testing of the friction and wear characteristics of materials under multiaxial stress states. The aim is to improve the loading simulation capability, data acquisition accuracy, and representativeness of the results, thereby expanding the applicability and engineering adaptability of the testing rig. (Refer to...) Figure 1 The system includes a main frame 14, a working platform 8, a vertical loading beam 5, a rotary transition beam 6, a pressure-torsion panel 18, and a pressure-torsion compound actuator. The main frame 14 consists of two vertically arranged columns, with a fixed crossbeam 2 at the top between the two columns. The working platform 8 is connected to the bottom of the two columns. The vertical loading beam 5 is located below the fixed crossbeam 2 and is parallel to the fixed crossbeam 2. A vertical servo actuator 3 is connected between the vertical loading beam 5 and the fixed crossbeam 2. The rotary transition beam 6 is connected below the vertical loading beam 5. A pressure-torsion panel 18 is located below the rotary transition beam 6. The pressure-torsion compound actuator is located on one side of the main frame 14. A ball joint or universal coupling is provided inside the rotary transition beam 6. The pressure-torsion compound actuator is connected to the rotary transition beam 6 through a drive shaft.

[0025] A servo cylinder connected to a vertical servo actuator 3 is installed on the fixed crossbeam 2. The servo cylinder is connected to a constant pressure servo oil source through a high-pressure hydraulic pipeline. A vertical servo actuator 3 is also installed inside the rotating transition beam 6. The output end of the vertical servo actuator 3 is connected to the pressure and torque panel 18, and the input end is connected to the servo cylinder. Two vertical servo actuators 3 are set to realize multi-dimensional and complex motion and force loading. The output end of the servo cylinder is fixedly connected to the upper end of the vertical servo actuator 3 through a connecting flange, and the loading force is transmitted to the sample end through the vertical loading beam 5 and the rotating transition beam 6 to realize the ballast function. A special fixture mounting slot is provided on the working platform 8.

[0026] In a further implementation, refer to Figure 2A loading beam sleeve 12 is fixedly connected inside the vertical loading beam 5. The lower end of the loading beam sleeve 13 extends out of the vertical loading beam 5 and is connected to a loading beam pad 13. The lower end of the loading beam pad 13 is connected to a rotary transition beam 6, which is perpendicular to the vertical loading beam 5. The system also includes a vertical displacement sensor 1. A sleeve 10 is provided inside the fixed crossbeam 2, and a fixed pad 11 is provided below the sleeve 10. The upper end of the vertical servo actuator 3 passes through the fixed pad 11 and the sleeve 10. The fixed crossbeam 2, the vertical servo actuator 3, the sleeve 10, and the fixed pad 11 all have screw holes. The sleeve 10 and the fixing pad 11 are fixed by at least one fixing bolt 9 passing through the screw hole on them. The vertical displacement sensor 1 is connected to the upper end of the vertical servo actuator 3 and fixed to the fixed crossbeam 2, which has both stability and detachability. It is used to monitor the vertical displacement in real time and improve the accuracy of the test data. The sleeve 10 is installed between the fixing bolt 9 and the hole wall to position and prevent surface damage during the tightening process. The fixing pad 11 is set on the top of the vertical servo actuator 3. The installation height and axis position of the actuator can be finely adjusted by replacing pads of different thicknesses to achieve the centering connection with the loading beam.

[0027] In other embodiments, a vertical displacement sensor 1 is also included. A sleeve 10 is provided inside the fixed crossbeam 2, and a fixed pad 11 is provided below the sleeve 10. The upper end of the vertical servo actuator 3 passes through the fixed pad 11 and the sleeve 10. The vertical servo actuator 3, the sleeve 10, and the fixed pad 11 all have screw holes. The vertical servo actuator 3, the sleeve 10, and the fixed pad 11 are fixed by at least one fixing bolt 9 passing through the screw holes. A linear guide rail 2 is provided inside the fixed crossbeam 2, and a slider 2 is provided on the linear guide rail 2. The upper end of the fixing bolt 9 is connected to the slider 2. The lower end of the fixed crossbeam 2 is hollowed out, and the slider 2 can slide along the linear guide rail 2, so that the vertical servo actuator 3, the sleeve 10, and the fixed pad 11 can move inside the fixed crossbeam 2. The vertical displacement sensor 1 is connected to the upper end of the slider 2.

[0028] In a further implementation, refer to Figure 4 A linear guide seat is provided between the pressure-torsion panel 18 and the rotary transition beam 6. The linear guide seat includes a linear guide rail and a slider. The linear guide rail is located at the bottom of the rotary transition beam 6, and the slider is connected to the top of the pressure-torsion panel 18. The slider can slide along the linear guide rail. The linear guide rail is parallel to the rotary transition beam 6. The linear guide seat is used to adjust the position of the pressure-torsion panel 18 during the loading process to ensure the stability and repeatability of the test.

[0029] It also includes a multi-channel control system, which is located on the side of the main frame 14 and is fixedly connected to the frame structure by bolts. This facilitates the operator to monitor the status and set parameters during the test. The system includes core control components such as a programmable controller, human-machine interface, data acquisition module, and analog / digital input / output interface. The multi-channel control system is connected to the constant pressure servo oil source, servo cylinder, vertical servo actuator, vertical displacement sensor and other execution and detection components via wired connection to achieve coordinated control and closed-loop feedback adjustment of each channel.

[0030] The system allows setting the loading rate, loading force, and loading mode (unidirectional loading or combined compression and torsion loading). During the test, it collects and processes various sensor signals in real time. A programmable logic controller (PLC) enables logic control and safety interlocking of the loading process. A human-machine interface displays the current test status, loading curve, and key parameters, improving operational convenience and data traceability, and ensuring the accuracy, stability, and high repeatability of the loading process. The multi-channel control system integrates data acquisition and analysis modules, enabling real-time monitoring and recording of parameters such as force, displacement, and torque during the loading process, and automatically generating stress-strain curves for convenient analysis of test results.

[0031] In a further implementation, refer to Figure 3 A vertical loading beam 5 is provided with multiple clamping wheels 4, which are respectively located at the four corners on both sides of the vertical loading beam 5, that is, four clamping wheels 4 are provided on each of the left and right sides of the vertical loading beam 5, for a total of eight, distributed on its upper and lower end faces and both side ends. In other embodiments, at least four clamping wheels 4 are provided, located at the four corners of the lower end of the vertical loading beam 5. Each clamping wheel 4 includes a clamping wheel housing 15, a clamping wheel body 16, and a clamping wheel ball bearing 17. The clamping wheel housing 15 is welded or bolted to the vertical loading beam 5. On the vertical loading beam 5, a connecting shaft is provided on the end of the clamping wheel 15 away from the vertical loading beam 5. The clamping wheel ball bearing 17 is sleeved on the connecting shaft, and the clamping wheel body 16 is located outside the clamping wheel ball bearing 17. During the test loading process, the clamping wheel 4 applies a clamping force in the vertical direction to ensure accurate transmission of the loading force and improve the stability and repeatability of the test results. After the test sample is initially positioned in the special fixture on the working platform 8, it is clamped and fixed simultaneously from multiple directions by the clamping wheel 4 to achieve omnidirectional spatial constraint.

[0032] Specifically, in this embodiment, the working platform 8 is made of high-strength metal material, which has good structural strength and loading stability, and is a key supporting component of the loading system; the linear guide rail seat allows the ballast panel 18 to slide precisely linearly along the guide rail direction (i.e., the longitudinal direction of the test bench), thereby realizing the adjustment of the overall position of the loading system. This structure enables the test sample and the loading mechanism to be precisely aligned before loading, ensuring the consistency of the loading axis, and facilitating sample replacement, switching between different test areas and rapid arrangement of structural modules, providing flexible spatial adaptability for multi-condition friction loading experiments.

[0033] The working principle of this invention is as follows: a constant pressure servo oil source provides stable hydraulic power, and the servo cylinder drives the pressure-torsion compound actuator under the regulation of the multi-channel control system to achieve compound loading on the test sample; the vertical servo actuator 3 provides vertical loading force, the fixed crossbeam 2 is fixed on the main frame 14, and the rotating transition beam 6 completes the precise loading of the sample. The data is collected and analyzed in real time through the vertical displacement sensor 1 and the control system.

[0034] The working process of this invention is as follows: Before the test, the test sample is placed in a special fixture on the working platform 8. The clamping wheels 4 installed at the four corners of the lower end of the vertical loading beam 5 are used to press or clamp the sample from multiple directions to ensure the stability of the sample position and the uniformity of the force during the loading process. At the same time, the constant pressure servo oil source, multi-channel control system, servo cylinder, sensor and actuator and other components are checked and adjusted to confirm that each part is accurately connected, runs normally, and meets the loading conditions. Through the human-machine interface, the operator sets the parameters required for the test in the multi-channel control system, such as the loading force, loading speed, torque, test time, etc.

[0035] The loading process consists of two phases:

[0036] (1) Vertical loading: The constant pressure servo oil source provides stable hydraulic power. The multi-channel control system issues loading commands to drive the vertical servo actuator 3 to generate axial movement. The vertical servo actuator 3 is installed in the upper frame structure of the test bench. Its output end is connected to the vertical loading beam 5 and the rotary transition beam 6 through the connecting structure. The loading force is transmitted from the vertical loading beam 5 to the fixed sample to realize the compression loading in the vertical direction. The vertical displacement sensor 1 is installed on the fixed crossbeam 2 to monitor the displacement changes in real time during the loading process and feed the data back to the multi-channel control system for loading adjustment and data acquisition.

[0037] (2) Compression-torsion combined loading: On the basis of completing the vertical compression load, the multi-channel control system further controls the servo cylinder to drive the compression-torsion combined actuator. The compression-torsion combined actuator is installed on one side or behind the loading system and is connected to the rotary transition beam 6 through the transmission shaft. One end of the rotary transition beam 6 is connected to the vertical loading beam 5, and the other end is connected to the output shaft of the compression-torsion combined actuator. Its structure is equipped with ball joints, universal couplings or flexible connectors, so that while the loading beam applies vertical pressure, it can also apply torsional load around the sample axis. This structure enables the loading beam to have the combined motion capability of axial compression and axial torsion, thereby realizing the compression-torsion combined loading of the sample. The rotary transition beam 6 acts as a force transmission and conversion structure during the loading process, and plays the role of introducing the torsional action into the loading beam.

[0038] The linear guide rail base can adjust the front and rear positions of the pressure and torsion panel 18 as needed. Together with the fixed crossbeam 2 and the loading system structure, it can realize the centering and working condition adaptability adjustment before loading, further improve the loading accuracy and test repeatability, and simulate the stress state of materials under actual complex stress environment.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A multifunctional friction test bench based on compressive-torsional compound action, characterized in that, The system includes a main frame (14), a working platform (8), a vertical loading beam (5), a rotary transition beam (6), a pressure-torsion panel (18), and a pressure-torsion coupling actuator. The main frame (14) consists of two vertically arranged columns, with a fixed crossbeam (2) at the top between the two columns. The working platform (8) is connected to the bottom of the two columns. The vertical loading beam (5) is located below the fixed crossbeam (2) and parallel to it. A vertical servo actuator (3) is connected between the vertical loading beam (5) and the fixed crossbeam (2). The rotary transition beam (6) is connected below the vertical loading beam (5). A pressure-torsion panel (18) is located below the rotary transition beam (6). The pressure-torsion coupling actuator is located on one side of the main frame (14). A ball joint or universal coupling is provided inside the rotary transition beam (6). The pressure-torsion coupling actuator is connected to the rotary transition beam (6) via a drive shaft. The loading process includes two parts:

1. Vertical loading: The constant pressure servo oil source provides stable hydraulic power. The multi-channel control system issues loading commands to drive the vertical servo actuator (3) to generate axial movement. The vertical servo actuator (3) is installed in the upper frame structure of the test bench. Its output end is connected to the vertical loading beam (5) and the rotary transition beam (6) through the connecting structure. The loading force is transmitted from the vertical loading beam (5) to the fixed sample to realize the compression loading in the vertical direction. The vertical displacement sensor (1) is installed on the fixed crossbeam (2) to monitor the displacement changes in real time during the loading process and feed the data back to the multi-channel control system for loading adjustment and data acquisition. II. Compression-torsion composite loading: Based on the completion of vertical compression loading, the multi-channel control system further controls the servo cylinder to drive the compression-torsion composite actuator. The compression-torsion composite actuator is installed on one side or behind the loading system and is connected to the rotary transition beam (6) through the transmission shaft. One end of the rotary transition beam (6) is connected to the vertical loading beam (6), and the other end is connected to the output shaft of the compression-torsion composite actuator. Its structure is equipped with ball joints, universal couplings or flexible connectors, so that while the loading beam applies vertical pressure, it can also apply torsional load around the sample axis. This structure enables the loading beam to have the composite motion capability of axial compression and axial torsion, thereby realizing the compression-torsion composite loading of the sample. The rotary transition beam (6) acts as a force transmission and conversion structure during the loading process, and plays the role of introducing the torsional action into the loading beam.

2. The multifunctional friction test bench based on compressive-torsional compound action according to claim 1, characterized in that, The fixed crossbeam (2) is equipped with a servo cylinder connected to the vertical servo actuator (3). The servo cylinder is externally connected to a constant pressure servo oil source. The rotating transition beam (6) is also equipped with a vertical servo actuator (3). The output end of the vertical servo actuator (3) is connected to the pressure and torque panel (18), and the input end is connected to the servo cylinder.

3. The multifunctional friction test bench based on compression-torsion compound action according to claim 2, characterized in that, The vertical loading beam (5) is fixedly connected to a loading beam sleeve (12). The lower end of the loading beam sleeve (13) extends out of the vertical loading beam (5) and is connected to a loading beam pad (13). The lower end of the loading beam pad (13) is connected to a rotating transition beam (6). The rotating transition beam (6) is perpendicular to the vertical loading beam (5).

4. The multifunctional friction test bench based on compression-torsion compound action according to claim 2, characterized in that, A linear guide seat is provided between the pressure-torsion panel (18) and the rotary transition beam (6). The linear guide seat includes a linear guide rail and a slider. The linear guide rail is located at the bottom of the rotary transition beam (6), and the slider is connected to the top of the pressure-torsion panel (18). The slider can slide along the linear guide rail, and the linear guide rail is parallel to the rotary transition beam (6).

5. The multifunctional friction test bench based on compressive-torsional compound action according to claim 4, characterized in that, It also includes a vertical displacement sensor (1), a sleeve (10) is provided inside the fixed crossbeam (2), a fixed pad (11) is provided below the sleeve (10), the upper end of the vertical servo actuator (3) passes through the fixed pad (11) and the sleeve (10), the fixed crossbeam (2), the vertical servo actuator (3), the sleeve (10) and the fixed pad (11) all have screw holes, the fixed crossbeam (2), the vertical servo actuator (3), the sleeve (10) and the fixed pad (11) are fixed by at least one fixing bolt (9) passing through the screw hole on it, and the vertical displacement sensor (1) is connected to the upper end of the vertical servo actuator (3) and fixed on the fixed crossbeam (2).

6. The multifunctional friction test bench based on compression-torsion compound action according to claim 4, characterized in that, It also includes a vertical displacement sensor (1), a sleeve (10) is provided inside the fixed crossbeam (2), a fixed pad (11) is provided below the sleeve (10), the upper end of the vertical servo actuator (3) passes through the fixed pad (11) and the sleeve (10), the vertical servo actuator (3), the sleeve (10) and the fixed pad (11) all have screw holes, the vertical servo actuator (3), the sleeve (10) and the fixed pad (11) are fixed by at least one fixing bolt (9) passing through the screw hole on it, the fixed crossbeam (2) is provided with a linear guide rail II, the linear guide rail II is provided with a slider II, the upper end of the fixing bolt (9) is connected to the slider II, the lower end of the fixed crossbeam (2) is hollowed out, the slider II can slide along the linear guide rail II, so that the vertical servo actuator (3), the sleeve (10) and the fixed pad (11) can move inside the fixed crossbeam (2), and the vertical displacement sensor (1) is connected to the upper end of the slider II.

7. The multifunctional friction test bench based on compression-torsion compound action according to any one of claims 5-6, characterized in that, It also includes a multi-channel control system, which is located on the side of the main frame (14) and includes a programmable controller, a human-machine interface, a data acquisition module, and an analog / digital input / output interface. The multi-channel control system is connected to a constant pressure servo oil source, a servo cylinder, a vertical servo actuator, and a vertical displacement sensor via wired connection.

8. The multifunctional friction test bench based on compressive-torsional compound action according to claim 1, characterized in that, The vertical loading beam (5) is provided with multiple clamping wheels (4), which are respectively located at the four corners on both sides of the vertical loading beam (5).

9. The multifunctional friction test bench based on compressive-torsional compound action according to claim 8, characterized in that, The clamping wheel (4) includes a clamping wheel housing (15), a clamping wheel body (16), and a clamping wheel ball bearing (17). The clamping wheel housing (15) is welded to the vertical loading beam (5). A connecting shaft is provided on one end of the clamping wheel (15) away from the vertical loading beam (5). The clamping wheel ball bearing (17) is sleeved on the connecting shaft. The clamping wheel body (16) is located outside the clamping wheel ball bearing (17).

10. The multifunctional friction test bench based on compressive-torsional compound action according to claim 1, characterized in that, The work platform (8) is equipped with a special fixture mounting slot.

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