Bio-friction and wear testing machine capable of achieving multi-friction motion

Abstract

The present invention discloses a bio-friction and wear testing machine capable of achieving multi-friction motion, which includes a frame. Above the frame, there is an empty platform. On the platform, there is a crank group mechanism. The crank group mechanism includes a flexible trapezoidal crank located at the center of the platform. The input shaft of the flexible trapezoidal crank is a transmission shaft, and the transmission shaft is connected to the vertical transmission hinge mechanism through a coupling to receive the rotational torque of the motor. The flexible trapezoidal crank is connected to four rigid elliptical cranks through connecting rods. On the rigid elliptical cranks, there are also vertical output shafts, and the output shafts extend downward and are respectively connected to a reciprocating swing mechanism and a ball-and-socket joint imitating a human joint for friction and wear testing. The crank group mechanism can not only accurately control the swing amplitude and frequency of the reciprocating swing mechanism, but also adapt to various complex working environments and meet the operation requirements under different application scenarios.

Description

Technical Field

[0001] The present invention belongs to the technical field of joint friction test devices, and particularly relates to a biological friction and wear testing machine capable of realizing multi-friction movements. Background Art

[0002] Diseases caused by joint friction and wear, joint diseases have become an increasingly common problem, attracting extensive attention in the medical field. Artificial joint replacement surgery has become the main means of treating joint diseases. However, in daily life, friction and wear of artificial joints are inevitable, which will lead to the generation of tiny wear debris. These wear debris may trigger inflammatory reactions, cause new lesions, and even accelerate joint wear, thus seriously affecting the long-term performance of artificial joints and the quality of life of patients. To prevent these problems, researchers and doctors must strictly evaluate the wear resistance of artificial joints before their widespread application. This process is usually completed by specialized friction and wear testing machines, which can simulate the mechanical conditions that joints bear during in-vivo activities to test the durability of the materials and designs of artificial joints. Currently, the replacement technologies for hip joints and knee joints are quite mature, and the corresponding friction and wear testing machines have been widely developed and used. These testing machines ensure that only materials that have passed strict tests and meet the wear resistance requirements can be used clinically. Compared with hip joints and knee joints, the replacement surgeries for other joints such as shoulder joints, elbow joints or finger joints started relatively late, and the related friction and wear testing machines are relatively few. Since the wear debris generated by artificial joint materials during in-vivo activities may cause serious consequences such as osteolysis, evaluating the friction and wear performance of these materials is crucial for selecting appropriate replacement materials. Through friction and wear tests, researchers can better understand the wear mechanisms of artificial joints under different conditions, so as to design more durable and adaptable artificial joints. This can not only improve the success rate of surgeries, relieve the pain of patients after surgery, but also extend the service life of artificial joints, which is of extremely important significance for improving the medical level and quality of life. In addition, with the development of technology, new artificial joint materials and design concepts are constantly emerging, such as nanomaterials, biomedical materials, etc. The introduction of these new materials and design concepts makes the wear resistance evaluation of artificial joints more complex. Therefore, researchers and doctors need to continuously update and improve the friction and wear testing machines to meet the evaluation needs of new artificial joints. The universality of joint diseases and the widespread application of artificial joint replacement surgery have made the wear resistance evaluation of artificial joints an important research field. Summary of the Invention

[0003] The object of the present invention is to provide a biological friction and wear testing machine capable of realizing multi-friction movements, which solves the problems that the existing biological friction and wear testing machines can perform fewer types of friction and wear tests and have lower efficiency.

[0004] The technical solution adopted by the present invention is as follows: a bio-friction and wear testing machine capable of realizing multi-friction motion, including a frame. Above the frame, there is an empty platform. On the platform, there is a crank group mechanism. The crank group mechanism includes a flexible trapezoidal crank located at the center of the platform. The input shaft of the flexible trapezoidal crank is a transmission shaft. The transmission shaft is connected to the vertical transmission hinge mechanism through a coupling to receive the rotational torque of the motor. The vertical transmission hinge mechanism is used to convert the transmission direction of power;

[0005] The flexible trapezoidal crank is connected to four rigid elliptical cranks through connecting rods. On the rigid elliptical cranks, there are also vertical output shafts. The output shafts extend downward and are respectively connected to a reciprocating swing mechanism and a ball-and-socket joint imitating a human joint for friction and wear testing.

[0006] The crank group drive mechanism is a new type of planar linkage mechanism that uses a crank and connecting rod to achieve synchronous rotation between multiple parallel shafts. The crank group drive mechanism is a planar linkage mechanism with virtual constraints composed of multiple cranks and a connecting rod truss. It has components such as cranks and connecting rods. When the mechanism works, the transmission shaft transmits motion and power to all output shafts through the connecting rod truss. The steering and rotational speed of the transmission shaft and each working shaft are the same. Therefore, any two cranks and the connecting rod truss in the entire mechanism can be simplified into a parallelogram double-crank mechanism. The main and driven cranks rotate at a fixed axis at the same speed, and the connecting rod truss makes a translational motion. Such a mechanism does not complete all motions and functions step by step through transmission pairs like traditional gear transmission, belt transmission, and chain transmission. It is a new type of mechanism that mainly uses the connecting rod support to drive multiple cranks to achieve synchronous rotation between multiple parallel shafts, and it is also evolved from a parallelogram double-crank mechanism.

[0007] The characteristics of the present invention also lie in that,

[0008] At the connection between the flexible trapezoidal crank and the four rigid elliptical cranks, four connecting rods are pressed by a fixing ring, and bearings are installed in the inner hole of the fixing ring. When the flexible trapezoidal crank makes a rotational motion, since bearings are installed in the fixing ring, it will drive the connecting rods fastened to the crank by the fixing ring to swing, thereby driving the four rigid elliptical cranks to make a rotational motion, and further driving the output shafts connected to the rigid elliptical cranks to make a rotational motion.

[0009] The output shafts include a first working shaft, a second working shaft, a third working shaft, and a fourth working shaft;

[0010] The first working shaft has a certain corner; the second working shaft is a vertical shaft, and the middle part of the shaft is connected by a coupling;

[0011] Both the third working shaft and the fourth working shaft are connected to the reciprocating swing mechanism through couplings. The lower end of the reciprocating swing mechanism is connected to a universal joint; the positions of the reciprocating swing mechanisms connected to the third working shaft and the fourth working shaft are different, and the formed swing orientations are also different;

[0012] The ends of the first working axis, the second working axis, the third working axis, and the fourth working axis are all connected to the ball socket through screws and flanges. A ball head is connected to the fixed column through screws on the lifting platform. The ball socket and the ball head are in corresponding positions and are connected by spherical contact imitating human joints; the ball socket and the ball head constitute a bionic joint tissue, and each working axis can drive the ball socket to perform a friction and wear test along the loop of the ball head.

[0013] A solution pool is also arranged on the lifting platform, and the solution pool can fully cover the ball socket and the ball head; the height of the solution pool is lower than the flanges connected to the working axes.

[0014] The vertical transmission hinge mechanism includes a fixed bracket. The fixed bracket connects the horizontal output shaft of the motor to the vertical transmission shaft of the crank group mechanism. The motor output shaft and the transmission shaft are also connected through a Z-shaped hinge and a movable connecting rod. One end of the movable connecting rod connected to the motor output shaft or the transmission shaft is hinged, realizing power transmission on the vertical axis and motion conversion between multiple planes, and then completing precise displacement control in the vertical direction.

[0015] Lifting guide rails are arranged at the bottom of the lifting platform, and the lifting guide rails are connected to hydraulic rods. The lifting guide rails and the hydraulic rods work together to achieve the stable and safe up and down movement of the lifting platform.

[0016] The reciprocating swing mechanism includes a disc connected to the lower end of the third working axis or the fourth working axis. The disc is located inside the fixed frame; the lower end of the fixed frame is connected through a roller. Earmuffs are nested and connected at positions close to both sides of the fixed frame. The other ends of the two earmuffs are connected through a sliding rod. A slider is arranged on the sliding rod, and the slider is connected to the disc through a connecting shaft. The lower end of the rotating shaft is connected to a universal joint through a connecting rod shaft, thereby driving the ball socket and the ball head to perform reciprocating swing within a circular surface.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] First, the transmission part uses a vertical transmission hinge mechanism and a crank group mechanism to form a stable and efficient output and output four working shafts for friction and wear tests. The vertical transmission hinge mechanism can save space, making the transmission mechanism more compact, thus creating more space for other components. The structure of this mechanism is relatively simple and has a high failure rate, while the vertical transmission hinge mechanism avoids these problems. Its simple design reduces the failure rate and simplifies the maintenance process. The vertical transmission hinge mechanism has high cost-effectiveness. Due to its simple structure, the manufacturing cost is relatively low, providing strong support for the cost control of the entire mechanical system. This mechanism has a high transmission efficiency. Its design enables power to be effectively transmitted between the hinges, thereby improving the efficiency of the entire transmission system. The vertical transmission hinge mechanism also has strong flexibility, such as angle changes and position movements, which greatly enhances the adaptability and flexibility of the equipment. The crank group mechanism is mainly composed of multiple cranks and connecting rods. The mutual cooperation of these components enables the rotational motion to be cleverly converted into multi-output working shafts, thus meeting the motion requirements of many mechanical devices. This conversion of the motion mode not only enables the mechanical device to achieve more complex functions, but also makes the operation of the device more efficient and stable in practical applications. In addition, the crank group mechanism also has a unique function, that is, to amplify the angular velocity of the rotational motion. This function enables the mechanical device to achieve a faster motion speed while maintaining a high efficiency. This transmission method has a simple structure, is easy to manufacture, and has a low cost. Its advantages include: 1. Simple structure: The design of the crank drive mechanism is compact and the structure is simple. 2. High transmission efficiency: Due to less friction during the transmission process, the transmission efficiency is high and the energy loss is small. 3. Wide application range: It is applicable to a variety of equipment and occasions and has wide adaptability. 4. Convenient adjustment: The driving speed and stroke can be changed by adjusting the positional relationship between the crank and the slider to meet the requirements of different working conditions. 5. Stable and reliable: It runs smoothly, has a low failure rate, and has high stability and durability.

[0019] Second, there are four groups of output working shafts and they can conduct friction and wear tests in different ways. The crank group mechanism installed at the top can effectively output four working shafts, greatly improving the efficiency of friction and wear tests, saving time and reducing costs. The friction and wear methods of each output working shaft are different. At the same time, the bionic ball head can be replaced, which can enrich the types of friction and wear and increase the friction and wear patterns of various bone joints. Four independent working shafts are configured, enabling it to conduct multiple different friction and wear tests simultaneously, testing multiple materials, components or systems at the same time, thus greatly improving the experimental efficiency. Each output working shaft adopts a different friction and wear method, and the device can simulate and study various complex friction phenomena. This diversity is crucial for understanding the material behavior, wear mechanism and its influence under different conditions. The design of the crank group mechanism helps to precisely control the movement of each working shaft, ensuring the consistency and repeatability of test conditions. This not only improves the reliability of experimental results but also reduces the uncertainty caused by mechanical errors. By conducting multiple tests simultaneously, the device significantly improves the overall research efficiency. In addition, reducing the time and resource consumption of a single test also helps to reduce experimental costs, making large-scale research projects more feasible. The ability to conduct friction and wear tests in different ways means that the device can simulate a wider range of actual application environments, covering the needs of multiple fields from industrial machinery to biological tissues. Simulate the friction process of joints or other biological tissues to study the long-term performance and biocompatibility of artificial joint implants. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] For the convenience of those skilled in the art to understand, the present invention will be further described below in conjunction with the drawings.

[0021] Figure 1 is a three-dimensional structural schematic diagram of the testing machine of the present invention;

[0022] Figure 2 is a schematic diagram of the crank group mechanism seen from above of the testing machine of the present invention;

[0023] Figure 3 is a structural schematic diagram of the installation solution pool of the present invention;

[0024] Figure 4 is of the present invention Figure 3 structural schematic diagram of A therein;

[0025] Figure 5 is of the present invention Figure 3 three-dimensional structural schematic diagram of B therein;

[0026] Figure 6 is a structural schematic diagram of the universal joint of the present invention.

[0027] In the figure: 1. Floor feet, 2. Support rod, 3. Ball head, 4. Ball socket, 5. First working shaft, 6. Second working shaft, 7. Coupling, 8. Vertical transmission hinge mechanism, 81. Fixed bracket, 82. Z-shaped hinge, 83. Movable connecting rod, 9. Crank group mechanism, 91. Rigid elliptical crank, 92. Working shaft, 93. Connecting rod, 94. Bearing, 95. Fixed ring, 96. Transmission shaft, 97. Flexible trapezoidal crank, 10. Motor, 11. Third working shaft, 12. Fourth working shaft, 13. Reciprocating swing mechanism, 131. Fixed frame, 132. Disc, 133. Slide block, 134. Slide bar, 135. Rotating shaft, 136. Ear plate, 14. Universal joint, 15. Lifting platform, 16. Lifting guide rail, 17. Hydraulic rod, 18. Solution tank. Detailed implementation manners

[0028] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the protection scope of the present invention.

[0029] Embodiment 1

[0030] Refer to Figures 1 - 2 As shown, a bio-friction and wear testing machine capable of realizing multi-friction motion includes a frame. An empty platform is arranged above the frame. A crank group mechanism 9 is arranged on the platform. The crank group mechanism 9 includes a flexible trapezoidal crank 97 located at the center of the platform. The input shaft of the flexible trapezoidal crank 97 is a transmission shaft 96. The transmission shaft 96 is connected to the vertical transmission hinge mechanism 8 through a coupling to receive the rotational torque of the motor 10. The vertical transmission hinge mechanism 8 is used to convert the transmission direction of the power;

[0031] The main task of the transmission shaft 96 is to receive the rotational torque of the motor 10 and transmit it to other parts of the mechanism. The transmission shaft 96 is designed to have high torsional rigidity and good concentricity to ensure stable and accurate power transmission during high-speed operation. This mechanism is equipped with four output shafts as working shafts. The working shafts are connected to the cranks, and the movement of the cranks will drive the four working shafts to rotate accordingly.

[0032] The frame of the present invention includes support rods 2 arranged at the four corners. The main functions of the support rods 2 include providing stability, bearing and distributing loads, adjusting the structural position, fixing and installing equipment, optimizing performance, and protecting the structure, etc. Floor feet 1 are arranged at the bottom of the frame, and the floor feet 1 are used to support and balance the overall equipment.

[0033] The flexible trapezoidal crank 97 is connected to four rigid elliptical cranks 91 through connecting rods 93; vertical output shafts 92 are also provided on the rigid elliptical cranks 91, and the output shafts 92 extend downward and are respectively connected to ball heads and ball sockets imitating human joints for friction and wear tests.

[0034] At the connection of the flexible trapezoidal crank 97 and the four rigid elliptical cranks 91, the fixing ring 95 presses the four connecting rods 93, and a bearing 94 is installed in the inner hole of the fixing ring 95; when the flexible trapezoidal crank 97 rotates, due to the installation of the bearing 94 in the fixing ring 95, it will drive the connecting rods 93 fastened to the crank by the fixing ring 95 to swing, thereby driving the four rigid elliptical cranks 91 to rotate, and further driving the output shafts connected to the rigid elliptical cranks 91 to rotate.

[0035] The output shaft 92 includes a first working shaft 5, a second working shaft 6, a third working shaft 11, and a fourth working shaft 12;

[0036] The first working shaft 5 has a certain corner; the second working shaft 6 is a vertical shaft, and the middle part of the shaft is connected by a coupling 7. The coupling helps to improve the stability and reliability of the entire transmission system, and the rotational movement of the shaft further realizes the surface friction and wear test of the ball head and the ball socket.

[0037] Both the third working shaft 11 and the fourth working shaft 12 are connected to the reciprocating swing mechanism 13 through couplings, and the lower end of the reciprocating swing mechanism 13 is connected to a universal joint 14; the positions of the reciprocating swing mechanisms connected to the third working shaft 11 and the fourth working shaft 12 are different, and the formed swing orientations are also different;

[0038] The ends of the first working shaft 5, the second working shaft 6, the third working shaft 11, and the fourth working shaft 12 are all connected to the ball socket 4 through screws and flanges. A ball head 3 is connected to the fixed column through screws on the lifting platform. The ball socket 4 and the ball head 3 are in corresponding positions and are connected in a spherical contact imitating human joints; the ball socket 4 and the ball head 3 form a bionic joint tissue, and each working shaft can drive the ball socket 4 to perform friction and wear tests along the loop of the ball head 3; this friction and wear method increases the types of friction and wear and also expands the area of friction and wear, which is beneficial to simulating the friction and wear conditions of human joints.

[0039] Embodiment 2

[0040] On the basis of Embodiment 1,

[0041] As Figures 3 - 5As shown, a solution pool 18 is also provided on the lifting platform 15, and the solution pool 18 can fully cover the ball socket 4 and the ball head 3; the height of the solution pool 18 is lower than that of each flange connected to the working shaft. The solution pool 18 is a fixed device installed on the lifting platform, mainly used for storing the solution required for the friction and wear test. The height of the solution pool is lower than that of each flange connected to the working shaft, ensuring the smooth flow of the solution during the test and fully covering the ball head and the ball socket. These two components, as the key components of the friction and wear test, are completely immersed in the solution to carry out the test. Such a design can accurately simulate and evaluate the friction and wear performance of the ball head and the ball socket under real working conditions.

[0042] The vertical transmission hinge mechanism 8 includes a fixed bracket 81. The fixed bracket 81 connects the output shaft of the motor in the horizontal direction with the transmission shaft 96 of the crank group mechanism in the vertical direction. The output shaft of the motor and the transmission shaft 96 are also connected by a Z-shaped hinge 82 and a movable connecting rod 83. One end of the movable connecting rod 83 connected to the output shaft of the motor or the transmission shaft 96 is hinged, realizing the power transmission on the vertical axis and the motion conversion between multiple planes, and then completing the precise displacement control in the vertical direction. The vertical transmission hinge mechanism is specially designed to efficiently transmit power on the vertical axis, realize the motion conversion between multiple planes, and then complete the precise displacement control in the vertical direction. The power input source is a motor, which is linked with the vertical transmission hinge device. With the help of the transmission shaft, huge power is transmitted to the inside of the crank group mechanism, and then the connecting rod drives the rigid elliptical crank to perform various complex motion tasks. In the vertical transmission hinge mechanism 8 of the present invention, its main function is to perform the motion conversion and force transmission functions in the vertical direction. The mechanism 8 is connected to the motor 10 through a coupling in the horizontal direction and connected to the transmission shaft 96 through a coupling in the vertical direction. The motor 10, as the initial power source, converts the horizontal rotational power generated by it into vertical rotational power output through the vertical transmission hinge mechanism 8. Thereafter, the vertical rotational power is further converted through the crank group mechanism 9, and finally output as four vertically rotating working shafts.

[0043] Lifting guide rails 16 are provided at the bottom of the lifting platform 15. The lifting guide rails 16 are connected to the hydraulic rods 17, and the lifting guide rails 16 and the hydraulic rods 17 work together to realize the smooth and safe up and down movement of the lifting platform.

[0044] As Figures 5 - 6As shown in the figure, the reciprocating swing mechanism 13 can achieve reciprocating swing on a circular surface, including a disc 132 connected to the lower end of the third working shaft 11 or the fourth working shaft 12. The disc 132 is located inside the fixed frame 131. The lower end of the fixed frame 131 is connected by a roller 135. The rotary shaft 135 is nested and connected with ear plates 136 near both sides of the fixed frame 131. The other ends of the two ear plates 136 are connected by a slide bar 134. A slider 133 is arranged on the slide bar 134. The slider 133 is connected to the disc 132 through a connecting shaft. The slider 133 moves horizontally along the slide bar 134 as the disc 132 rotates. The lower end of the rotary shaft 135 is connected to the universal joint 14 through a connecting rod shaft, thereby driving the ball socket 4 and the ball head 3 to achieve reciprocating swing motion within the circular surface. In this mechanism, the fixed frame 131 provides a stable support base. The two working shafts are connected to the reciprocating swing mechanism to convert the rotary motion into a swing motion composed of a slider and a slide bar. The slide bar drives the rotary shaft to rotate, and the rotary shaft is connected to the universal joint to achieve reciprocating swing on the circular surface.

[0045] In the present invention, the two working shafts are connected to the reciprocating swing mechanism, and its function is to convert the rotary motion of the working shafts into a swing motion achieved through a slider and a slide bar. This conversion enables the universal joint at the end of the slide bar to effectively reciprocate on the circular surface, thereby realizing the efficient reciprocating swing action of the reciprocating swing mechanism within the circular surface. Through such a structural design, the reciprocating swing mechanism can not only accurately control the swing amplitude and frequency, but also adapt to various complex working environments and meet the operation requirements under different application scenarios.

[0046] Embodiment 3

[0047] The test machine of the present invention is composed of a crank group mechanism and can achieve various friction motions. The main components of the test machine include a crank group mechanism, a motor, a vertical transmission hinge mechanism, a support rod, a reciprocating swing mechanism, a ball head, a ball socket, a solution pool, and a lifting platform. The crank group mechanism is composed of cranks and can simulate the complex motions of biological joints, achieving various friction motions to meet the requirements of different friction and wear tests. The motor is connected to the crank group mechanism, and the motor transmits power to the vertical transmission hinge mechanism, thereby driving the operation of the entire test machine. The function of the vertical transmission hinge mechanism is to convert the transmission direction of the power so that effective power transmission can be carried out in space. The support rod is used to support the entire test machine to ensure its stability and safety. The reciprocating swing mechanism can achieve the reciprocating motion of the test machine to simulate the friction and wear conditions in the actual working environment. The ball head and the ball socket are key components of the test machine, and the friction motion between them can simulate the actual working conditions of biological joints. The solution pool is used to store the friction and wear solution to simulate different test environments. The lifting platform can achieve the lifting of the working surface of the test machine so as to carry out friction and wear tests at different heights. By connecting four groups of humanoid ball head and ball socket materials through the crank group mechanism for friction and wear tests, different friction modes are formed to improve the efficiency of friction and wear tests and increase the types of friction and wear tests.

[0048] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only the specific implementation manners. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A biological friction and wear testing machine capable of realizing multi-friction motion, characterized in that: It includes a frame, above which there is an overhead platform. On the platform, there is a crank group mechanism (9). The crank group mechanism (9) includes a flexible trapezoidal crank (97) located at the center of the platform. The input shaft of the flexible trapezoidal crank (97) is a transmission shaft (96). The transmission shaft (96) is connected to the vertical transmission hinge mechanism (8) through a coupling to receive the rotational torque of the motor (10). The vertical transmission hinge mechanism (8) is used to convert the transmission direction of the power; The flexible trapezoidal crank (97) is connected to four rigid elliptical cranks (91) through connecting rods (93). On the rigid elliptical crank (91), there is also a vertical output shaft (92). The output shaft (92) extends downward and is respectively connected to the ball head and socket of the human body joint analog for friction and wear tests; At the connection of the flexible trapezoidal crank (97) and the four rigid elliptical cranks (91), a fixing ring (95) presses the four connecting rods (93). A bearing (94) is installed in the inner hole of the fixing ring (95). When the flexible trapezoidal crank (97) makes a rotational motion, since the bearing (94) is installed in the fixing ring (95), it will drive the connecting rods (93) fastened to the crank by the fixing ring (95) to swing, thereby driving the four rigid elliptical cranks (91) to make a rotational motion, and further driving the output shafts connected to the rigid elliptical cranks (91) to make a rotational motion; The output shaft (92) includes a first working shaft (5), a second working shaft (6), a third working shaft (11), and a fourth working shaft (12); The first working shaft (5) has a certain corner. The second working shaft (6) is a vertical shaft, and the middle part of the shaft is connected by a coupling (7); Both the third working shaft (11) and the fourth working shaft (12) are connected to the reciprocating swing mechanism (13) through couplings. The lower end of the reciprocating swing mechanism (13) is connected to a universal joint (14). The positions of the reciprocating swing mechanisms connected to the third working shaft (11) and the fourth working shaft (12) are different, and the formed swing orientations are also different; The ends of the first working shaft (5), the second working shaft (6), the third working shaft (11), and the fourth working shaft (12) are all connected to the ball socket (4) through screws and flanges. On the lifting platform, a ball head (3) is connected to the fixed column through screws. The ball socket (4) and the ball head (3) are in corresponding positions and are connected in a spherical contact manner of the human body joint analog. The ball socket (4) and the ball head (3) constitute a bionic joint tissue, and each working shaft can drive the ball socket (4) to perform friction and wear tests along the loop of the ball head (3); The vertical transmission hinge mechanism (8) includes a fixed bracket (81), and the fixed bracket (81) connects the output shaft of the motor in the horizontal direction to the transmission shaft (96) of the crank group mechanism in the vertical direction. The output shaft of the motor and the transmission shaft (96) are also connected through a Z-shaped hinge (82) and a movable connecting rod (83). One end of the movable connecting rod (83) connected to the output shaft of the motor or the transmission shaft (96) is hinged, so as to achieve power transmission on the vertical axis and realize the motion conversion between multiple planes, and further complete the precise displacement control in the vertical direction. The reciprocating swing mechanism (13) includes a disc (132) connected to the lower end of the third working shaft (11) or the fourth working shaft (12). The disc (132) is located inside the fixed frame (131). The lower end of the fixed frame (131) is connected through a rotating shaft (135). The rotating shaft (135) is nested and connected with ear plates (136) near both sides of the fixed frame (131). The other ends of the two ear plates (136) are connected through a sliding rod (134). A slider (133) is arranged on the sliding rod (134). The slider (133) is connected to the disc (132) through a connecting shaft. The lower end of the rotating shaft (135) is connected to a universal joint (14) through a connecting rod shaft, so as to drive the ball socket (4) and the ball head (3) to perform a reciprocating swing motion within the circular surface.

2. The bio-friction and wear testing machine capable of achieving multi-friction motion according to claim 1, wherein: A solution tank (18) is further arranged on the lifting platform. The solution tank (18) can fully cover the ball socket (4) and the ball head (3). The height of the solution tank (18) is lower than the flanges connected to each working shaft.

3. The bio-friction and wear testing machine capable of achieving multi-friction motion according to claim 1, characterized in that: The bottom of the lifting platform is provided with lifting guide rails (16), and the lifting guide rails (16) are connected to hydraulic rods (17). The lifting guide rails (16) and the hydraulic rods (17) work together to realize the stable and safe up and down movement of the lifting platform.

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