Artificial hip joint wear test system

Abstract

The artificial hip joint wear test system comprises a first linear motor; the first clamp is used for clamping a contrast sample and can be driven by the first linear motor to reciprocate up and down in the vertical direction; the first load sensor is arranged between the first linear motor and the first clamp; the follow-up platform is arranged between the first clamp and the micro-separation platform and is connected with the balancing weight through a steel wire rope bypassing the fixed pulley so as to just counteract the preset weight, so that the control sample and the test sample are subjected to the same vertical downward load; a micro-separation platform; the second clamp is used for clamping a test sample; the second load sensor is arranged between the micro-separation platform and the second clamp; and the three-axis rotating mechanism is connected with the second clamp and is used for applying rotating force to the test sample in at least one of the X-axis direction, the Y-axis direction and the Z-axis direction. The control sample provides a reference that can be observed over time, which helps to compare and differentiate the long-term wear characteristics of new materials or designs of the test sample.

Description

Technical Field

[0001] The invention relates to the technical field of medical device detection, and in particular to an artificial hip joint wear testing system. Background Art

[0002] With the development of medical technology, artificial hip prostheses are increasingly widely used in clinical practice, but their postoperative complications have always been a major problem that plagues clinicians and patients. Prosthesis loosening is the main complication of artificial hip replacement, which directly affects the success of the operation and the retention time of the hip prosthesis in the body. After the artificial hip prosthesis is implanted in the human body, it will produce relative movement with the body's own bones and tissues and wear. The wear particles generated during the wear process will induce bone dissolution and cause aseptic loosening. Therefore, artificial hip prostheses need to be subjected to wear tests after they are manufactured.

[0003] At present, the existing technology generally uses hydraulic loading or cam loading to apply load to artificial hip prostheses. The hydraulic loading method is difficult to meet the requirements of applying precise loads in artificial hip prosthesis wear tests, and is not suitable for hip wear tests with small loads and high number of cycles. The cam loading method is to output the cam outer contour curve as the load curve of the artificial hip prosthesis through cam rotation. The load curve applied by the cam is single, which is not suitable for hip wear tests where the hip prosthesis is subjected to multiple loads under complex working conditions.

[0004] In addition, for artificial hip prostheses using new materials or new designs, how to evaluate and / or detect the differences in their long-term wear characteristics under conventional single-direction loading and under multiple load loading in complex working conditions, and then evaluate the effects of new materials and / or new designs, is also an urgent problem that needs to be solved.

[0005] Therefore, it is necessary to study an artificial hip joint wear testing system to solve one or more of the above-mentioned technical problems. Summary of the invention

[0006] In order to solve at least one of the above technical problems, according to one aspect of the present invention, an artificial hip joint wear testing system is provided, comprising:

[0007] A first linear motor can be used to apply a load vertically downward;

[0008] A first clamp, used to clamp the control sample and driven by the first linear motor to reciprocate up and down in the vertical direction;

[0009] A first load sensor is disposed between the first linear motor and the first fixture and is used to measure the load value applied to the control sample in real time;

[0010] A follower platform is disposed between the first fixture and the micro-separation platform and connected to a counterweight block via a wire rope passing around a fixed pulley to just offset the predetermined weight so that the control sample and the test sample are subjected to the same vertical downward load;

[0011] The micro-separation platform comprises a first slider guide mechanism that slides freely along a first direction in a horizontal plane and a second slider guide mechanism that slides freely along a second direction in the horizontal plane, wherein the first slider guide mechanism is integrally arranged on a slider of the second slider guide mechanism, and the first direction is perpendicular to the second direction;

[0012] A second fixture, used to clamp the test sample;

[0013] A second load sensor, disposed between the micro-separation platform and the second fixture and used to measure the load value applied to the test sample in real time; and

[0014] The three-axis rotation mechanism is connected to the second fixture and is used to apply a rotation force to the test sample in at least one direction of the three-axis directions of XYZ.

[0015] According to another aspect of the present invention, the artificial hip joint wear testing system also includes a workbench, which is provided with two guide pillars, and a movable crossbeam whose height position can be adjusted along the two guide pillars is arranged between the two guide pillars, and the first linear motor and the fixed pulley are fixed to the movable crossbeam.

[0016] According to yet another aspect of the present invention, the first fixture and the second fixture each include a top seat and a bottom seat, and the control sample and the test sample are clamped between the top seat and the bottom seat.

[0017] According to yet another aspect of the present invention, the three-axis rotation mechanism comprises:

[0018] A first support frame and a second support frame arranged in parallel;

[0019] A square outer frame; disposed between the first support frame and the second support frame; and

[0020] A U-shaped frame connected to the inner side of the square outer frame;

[0021] Wherein, the relative outer sides of the square outer frame are provided with X-axis output flanges, and the X-axis output flanges are rotatably connected to the first support frame and the second support frame respectively, and the first rotating motor fixed to the first support frame can drive the square outer frame to rotate around the X-axis via the X-axis output flange;

[0022] The relative outer sides of the U-shaped frame are each provided with a Y-axis output flange, and the Y-axis output flanges are rotatably connected to the inner sides of the square outer frame, respectively, and the second rotary motor fixed on the square outer frame can drive the U-shaped frame to rotate around the Y-axis via the Y-axis output flange;

[0023] A Z-axis output flange is rotatably connected within the U-shaped frame, and a third rotary motor fixed outside the U-shaped frame can drive the test sample to rotate around the Z-axis.

[0024] According to another aspect of the present invention, the second support frame is provided with a first limit device for limiting the rotation angle of the square outer frame, and the square outer frame is provided with a second limit device for limiting the rotation angle of the U-shaped frame.

[0025] According to another aspect of the present invention, the follower platform includes a follower plate, and the first sliding sleeve and the second sliding sleeve are respectively connected to the two sides of the follower plate, and the first sliding sleeve and the second sliding sleeve are respectively and correspondingly freely slidably mounted on one of the two guide pillars.

[0026] According to another aspect of the present invention, the slider of the first slider guide rail mechanism is connected to the follower plate via an upper end plate, and the guide rail of the second slider guide rail mechanism is connected to the second fixture via a lower end plate.

[0027] According to another aspect of the present invention, the micro-separation platform further includes an X-axis displacement sensor and a Y-axis displacement sensor for measuring the displacement of the micro-separation platform in the X-axis direction and the Y-axis direction.

[0028] According to another aspect of the present invention, the artificial hip joint wear testing system also includes a counterweight plate and two counterweight brackets fixed in parallel to the lower side of the movable crossbeam, and the counterweight bracket, fixed pulley, counterweight block, counterweight plate, follower platform and steel wire rope constitute a counterweight structure; the fixed pulleys are divided into two groups and are respectively fixed to the sides of the two counterweight brackets, and each group of fixed pulleys includes two fixed pulleys; there are two steel wire ropes, and the first ends are respectively passed around the corresponding fixed pulley groups and connected to the counterweight block through a hanging ring, and the second ends are connected to the follower platform, the counterweight plate is fixed to the bottom of the counterweight block, and the counterweight block can move up and down with the operation of the first linear motor.

[0029] According to another aspect of the present invention, the number of counterweight blocks and / or counterweight plates is adjustable, the control sample and the test sample have the same structure and receive the same load from the first linear motor, and the test sample also additionally receives the rotational force applied by the three-axis rotation mechanism.

[0030] The present invention can achieve one or more of the following technical effects:

[0031] 1. With the artificial femoral head as the origin, the test sample can be rotated in the X / Y / Z directions and loaded in the vertical direction to truly simulate the movement of the hip joint;

[0032] 2. Provide control group samples and test group samples, and conduct control experiments simultaneously to compare wear rates. Through the control group, researchers can measure the natural wear rate of hip joint materials under the same conditions to help evaluate the improvement effects of new materials or lubricants.

[0033] 3. The control group can filter out the impact of the environment or experimental conditions on the results, making the test results more scientific and reliable.

[0034] 4. In some long-term wear tests, a control group provides a baseline that can be observed over time and helps distinguish the long-term wear characteristics of new materials or designs.

[0035] 5. Providing control group samples and test group samples can avoid the interference of external sudden factors on sample data, which is conducive to removing relevant experimental data when there is damage other than wear;

[0036] 6. Setting up a micro-separation platform can achieve self-alignment of the test sample and the control sample, reducing the error generated when installing the sample; at the same time, the micro-separation platform can also eliminate the constraint force in the horizontal plane between the test sample and the control sample, so that the vertical load is loaded and transmitted to both in equal amounts. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0038] Figure 1 Schematic diagram of a hip prosthesis wear testing machine according to a preferred embodiment of the present invention.

[0039] Figure 2 for Figure 1 Schematic diagram of the partial structure of the hip prosthesis wear testing machine from another perspective.

[0040] Figure 3 The three-axis rotation mechanism diagram of a hip joint prosthesis wear testing machine according to a preferred embodiment of the present invention.

[0041] Figure 4 The figure is a schematic diagram of the exploded structure of a three-axis rotating mechanism according to a preferred embodiment of the present invention.

[0042] Figure 5 The figure is a schematic diagram of the explosion structure of a follower platform according to a preferred embodiment of the present invention.

[0043] Figure 6 Schematic diagram of the structure of a micro-separation platform (after removing the upper end plate) according to a preferred embodiment of the present invention.

[0044] Figure 7 Schematic diagram of the structure of a micro-separation platform according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0045] The best implementation mode of the present invention is described below through preferred embodiments in conjunction with the accompanying drawings. The specific implementation mode here is to illustrate the present invention in detail and should not be understood as limiting the present invention. Various deformations and modifications can be made without departing from the spirit and essential scope of the present invention, which should be included in the protection scope of the present invention.

[0046] Example 1

[0047] According to a preferred embodiment of the present invention, see Figure 1-7 , provides an artificial hip joint wear test system, comprising:

[0048] A first linear motor 4, which can be used to apply a load vertically downward;

[0049] A first clamp 7, used for clamping the control sample 51 and driven by the first linear motor to reciprocate up and down in the vertical direction;

[0050] A first load sensor 5, disposed between the first linear motor and the first fixture and used for measuring the load value applied to the control sample in real time;

[0051] A follower platform 200 is disposed between the first fixture and the micro-separation platform and connected to a counterweight block 11 via a steel wire rope 10 passing around a fixed pulley 9 to just offset the predetermined weight so that the control sample and the test sample are subjected to the same vertical downward load;

[0052] The micro-separation platform 100 includes a first slider guide mechanism 300 that slides freely along a first direction in a horizontal plane and a second slider guide mechanism 400 that slides freely along a second direction in the horizontal plane. The first slider guide mechanism is integrally arranged on sliders 38 and 39 of the second slider guide mechanism. The first direction is perpendicular to the second direction.

[0053] A second clamp 16, used for clamping the test sample 51;

[0054] A second load sensor 15, disposed between the micro-separation platform and the second fixture and used to measure the load value applied to the test sample in real time; and

[0055] The three-axis rotation mechanism 500 is connected to the second fixture and is used to apply a rotation force to the test sample in at least one direction of the three-axis directions of XYZ.

[0056] According to another preferred embodiment of the present invention, the artificial hip joint wear testing system also includes a workbench 1, the workbench is provided with two guide columns 2, a movable crossbeam 3 whose height position can be adjusted along the two guide columns is arranged between the two guide columns, and the first linear motor and the fixed pulley are fixed to the movable crossbeam.

[0057] According to another preferred embodiment of the present invention, the first fixture and the second fixture both include a top seat and a base, and the control sample and the test sample are clamped between the top seat and the base. For example, the first fixture includes a top seat 71 and a base 8.

[0058] According to another preferred embodiment of the present invention, the three-axis rotation mechanism 500 includes:

[0059] A first support frame 18 and a second support frame 19 arranged in parallel;

[0060] A square outer frame 20 is disposed between the first support frame and the second support frame; and

[0061] A U-shaped frame 21 connected to the inner side of the square outer frame;

[0062] Wherein, the relative outer sides of the square outer frame are provided with X-axis output flanges 25, and the X-axis output flanges are rotatably connected to the first support frame and the second support frame respectively, and the first rotary motor 22 fixed on the first support frame can drive the square outer frame to rotate around the X-axis via the X-axis output flange;

[0063] The relative outer sides of the U-shaped frame 21 are provided with Y-axis output flanges 26, and the Y-axis output flanges 26 are rotatably connected to the inner sides of the square outer frame 20, respectively. The second rotary motor 23 fixed on the square outer frame can drive the U-shaped frame to rotate around the Y-axis via the Y-axis output flanges;

[0064] A Z-axis output flange 127 is rotatably connected inside the U-shaped frame, and a third rotary motor 24 fixed outside the U-shaped frame can drive the test sample 51 to rotate the Z-axis output flange around the Z-axis.

[0065] According to another preferred embodiment of the present invention, the second support frame is provided with a first limiter 25 for limiting the rotation angle of the square outer frame, and the square outer frame is provided with a second limiter 26 for limiting the rotation angle of the U-shaped frame.

[0066] According to another preferred embodiment of the present invention, the follower platform 200 includes a follower plate 27, and the two sides of the follower plate are respectively connected with a first sliding sleeve 28 and a second sliding sleeve 29, and the first sliding sleeve and the second sliding sleeve are respectively and correspondingly freely slidably mounted on one of the two guide pillars.

[0067] According to another preferred embodiment of the present invention, the sliders 40 and 41 of the first slider guide mechanism are connected to the follower plate 27 via the upper end plate 31, and the guide rails 34 and 35 of the second slider guide mechanism are connected to the second fixture via the lower end plate 33. Specifically, the lower end plate 33 is connected to the base 8 of the second fixture.

[0068] According to another preferred embodiment of the present invention, the micro-separation platform further includes an X-axis displacement sensor 46 and a Y-axis displacement sensor 48 for measuring the displacement of the micro-separation platform in the X-axis direction and the Y-axis direction.

[0069] According to another preferred embodiment of the present invention, the artificial hip joint wear testing system also includes a counterweight plate 12 and two counterweight brackets 49 fixed in parallel to the lower side of the movable crossbeam 3, and the counterweight bracket, fixed pulley 9, counterweight block 11, counterweight plate 12, follower platform 200 and steel wire rope 10 constitute a counterweight structure; the fixed pulleys are in two groups and are respectively fixed to the sides of the two counterweight brackets, and each group of fixed pulleys includes two fixed pulleys; there are two steel wire ropes, and the first ends are respectively passed around the corresponding fixed pulley groups and connected to the counterweight block through a lifting ring, and the second ends are connected to the follower platform, the counterweight plate is fixed to the bottom of the counterweight block, and the counterweight block can move up and down with the operation of the first linear motor.

[0070] According to another preferred embodiment of the present invention, the number of the counterweight blocks and / or counterweight plates is adjustable, the control sample and the test sample have the same structure and receive the same load from the first linear motor, and the test sample also additionally receives the rotational force applied by the three-axis rotation mechanism 500.

[0071] It can be understood that the three-axis rotation mechanism is connected to the second fixture and is used to apply a rotational force to the test sample in at least one direction of the three-axis directions of XYZ, and the rotational force is not applied to the control sample.

[0072] Example 2

[0073] According to a preferred embodiment of the present invention, see Figure 1-7, and also provides an artificial hip joint wear test system, comprising: a workbench 1; a guide column 2, the workbench is provided with two guide columns, and the bottom ends of the guide columns are fixed on the workbench surface; a moving beam 3, the moving beam is fixed on the guide column; a first linear motor 4, the first linear motor is fixed on the moving beam 3; a first load sensor 5, the upper end face of which is connected to the output flange 6 of the linear motor and is used to measure the load value applied to the control sample in real time; a first clamp 7, the first clamp is connected to the lower end face of the first load sensor, the first clamp can reciprocate up and down in the vertical direction under the drive of the first linear motor, and the first clamp is used to clamp the control sample 51; a follower platform 200, including a follower plate 27 , the upper end surface of the follower plate 27 is connected to the first fixture base 8, the follower platform is movably connected to the guide column 2, and a pulley 9 is provided on the movable crossbeam; the follower platform is connected to the counterweight 11 through a wire rope 10, and the wire rope 10 passes around the pulley; the micro-separation platform 100, the upper end plate 13 of the micro-separation platform is connected to the lower end surface of the follower plate 27, and the lower end plate 14 is provided with a second load sensor 15; the second fixture 16, the second fixture 16 is connected to the lower end surface of the second load sensor 15, and the second fixture 16 is used to clamp the test sample; a three-axis rotation mechanism, the three-axis rotation mechanism is connected to the second fixture base, the three-axis rotation mechanism is provided with a bottom plate 17, and the lower end surface 17 of the bottom plate is fixed on the workbench 1.

[0074] It can be understood that the moving beam is fixed between the guide pillars during the operation of the first linear motor.

[0075] According to another preferred embodiment of the present invention, the three-axis rotation mechanism includes: a first support frame 18, a second support frame 19, an outer frame 20, a U-shaped frame 21, a first rotary motor 22, a second rotary motor 23, a third rotary motor 24, an X-axis output flange 25, a Y-axis output flange 26, and a Z-axis output flange 127. The first support frame 18 and the second support frame 19 are respectively fixed to the upper end surface of the bottom plate 17; the outer side of the outer frame 20 is provided with an X-axis output flange 25 which is rotatably connected to the first and second support frames and driven to rotate around the X-axis by the first rotary motor 22 fixed on the first support frame 18; the outer side of the U-shaped frame 21 is provided with a Y-axis output flange 26 which is rotatably connected to the inner side of the outer frame 20 and driven to rotate around the Y-axis by the second rotary motor 23 fixed on the outer frame 20; the Z-axis output flange 127 is rotatably connected to the inside of the U-shaped frame 21 and driven to rotate around the Z-axis by the third rotary motor 24 fixed outside the U-shaped frame.

[0076] According to another preferred embodiment of the present invention, a first limiter 25 for limiting the rotation angle of the outer frame is provided on the second support frame 19 , and a second limiter 26 for limiting the rotation angle of the U-shaped frame 21 is provided on the outer frame 20 .

[0077] According to another preferred embodiment of the present invention, the follower platform 200 includes: a follower plate 27, a first sliding sleeve 28, and a second sliding sleeve 29; the first sliding sleeve and the second sliding sleeve are respectively connected to both sides of the follower plate; the first sliding sleeve and the second sliding sleeve are respectively provided with a graphite brass sleeve 30, and the graphite brass sleeve 30 is slidably connected to the guide column.

[0078] According to another preferred embodiment of the present invention, the micro-separation platform 100 is used for self-centering of the test sample, and the deviation in the X / Y direction generated when the sample is installed is corrected by the micro-separation platform to ensure that the applied angular displacement is applied to the rotation center of the sample.

[0079] According to another preferred embodiment of the present invention, the micro-separation platform is used to eliminate the constraint force in the horizontal plane and transmit the loading force in the vertical direction to the test specimen, and also includes: an upper end plate 31, a middle plate 32, a lower end plate 33, a first linear guide rail 34, a second linear guide rail 35, a third linear guide rail 36, a fourth linear guide rail 37, a first slider 38, a second slider 39, a third slider 40, a fourth slider 41, a first limit plate 42, a second limit plate 43, a third limit plate 44, and a fourth limit plate 45. The upper end surface of the upper end plate 31 is connected to the lower end surface of the follower plate 27, and the lower end surface of the lower end plate 33 is bolted to the first and second sliders 38 and 39, and the first and second sliders are parallel to the X-axis. The first and second guide rails 34 and 35 are bolted to the upper end surface of the middle plate 32, and are slidably connected to the first slider 39 and the second slider 39 respectively. The lower end surface of the middle plate 32 is bolted to the third and fourth sliders 40 and 41, and the third and fourth sliders are parallel to the Y-axis direction. The third and fourth guide rails 36 and 37 are bolted to the upper end surface of the lower end plate, and are slidably connected to the third and fourth sliders 40 and 41 respectively. The lower end surface of the lower end plate is connected to the second clamp 16. The first guide rail 34 and the second guide rail 35 are respectively provided with a first limit plate 42 and a second limit plate 43 for limiting the displacement in the X direction at both ends, and the third guide rail 36 and the fourth guide rail 37 are respectively provided with a third limit plate 44 and a fourth limit plate 45 for limiting the Y direction at both ends.

[0080] According to another preferred embodiment of the present invention, the micro-separation platform further includes: an X-axis displacement sensor 46, an X-axis displacement sensor fixture 47, a Y-axis displacement sensor 48, and a Y-axis displacement sensor fixture 49. The X-axis displacement sensor 46 and the Y-axis displacement sensor 47 are used to measure the displacement of the micro-separation platform in the X-axis direction and the Y-axis direction, respectively; the X-axis displacement sensor fixture 48 connects the X-axis displacement sensor 46 to the lower end surface of the upper end plate 31 and makes the X-axis sensor 46 parallel to the X-axis. The Y-axis displacement sensor fixture 49 connects the Y-axis displacement sensor 48 to the outer side 42 of the first limit plate and makes the Y-axis sensor 48 parallel to the Y-axis.

[0081] According to another preferred embodiment of the present invention, the counterweight structure includes a counterweight bracket 49, a fixed pulley 9, a counterweight block 11, a counterweight plate 12, a follower platform and a steel wire rope 10. The counterweight bracket 49 has two pieces, which are respectively fixed to the lower side of the movable crossbeam 3, and the movable crossbeam 3 is installed between the two guide pillars 2; the fixed pulleys 9 have four pieces, two in a group, and are respectively assembled on the outside of the counterweight bracket through a rotating shaft and a retaining spring. The steel wire ropes 10 have two pieces, which pass around the fixed pulleys 9 and are connected to the counterweight block 11 through a hanging ring, the counterweight plate 12 is fixed to the bottom of the counterweight block 11, the counterweight block 11 is fixed to the follower platform, and the counterweight block 11 can move up and down along the Z-axis direction of the linear motor.

[0082] Preferably, the working process is as follows:

[0083] The control sample 50 is installed in the first fixture 7, and the test sample 51 is installed in the second fixture 16. The number of weight plates 12 is adjusted so that the weight structure can just offset the weight of the first linear motor output flange 6, the first fixture 7, the first load sensor 5, the follow-up platform, the micro-separation platform, the second load sensor 15, and the second fixture 16.

[0084] Start the first linear motor 4, and the motor output flange 6 drives the first load sensor 5 and the first clamp 7 to apply a vertically reciprocating load to the control sample 50. Through the above method, the vertically varying load can be equivalently transferred to the experimental group sample 51. At the same time, the three-axis rotation mechanism 500 applies a rotational force in at least one direction of the XYZ three-axis directions to be superimposed on the test sample. In the hip wear test, the role of the control group is to provide a benchmark or reference, allowing researchers to compare the test group (i.e., the group receiving a certain intervention or treatment) with the group that did not receive the intervention. This helps to determine whether a certain treatment, material or design improvement can reduce hip joint wear or have a positive effect on joint function.

[0085] Specifically:

[0086] Comparing wear rates: With a control group, researchers can measure the natural wear rate of hip materials under the same conditions, helping to evaluate the effectiveness of new materials or lubricant improvements.

[0087] Ensure the reliability of the results: The control group can filter out the impact of the environment or experimental conditions on the results, making the test results more scientific and reliable.

[0088] Observing long-term effects: In some long-term wear tests, a control group provides a baseline that can be observed over time, helping to differentiate the long-term wear characteristics of new materials or designs.

[0089] In conclusion, the control group plays an important reference role in hip wear testing, enabling researchers to scientifically and accurately evaluate the actual effects of interventions on hip wear resistance.

[0090] The present invention can achieve one or more of the following technical effects:

[0091] 1. With the artificial femoral head as the origin, the test sample can be rotated in the X / Y / Z directions and loaded in the vertical direction to truly simulate the movement of the hip joint;

[0092] 2. Provide control group samples and test group samples, and conduct control experiments simultaneously to compare wear rates. Through the control group, researchers can measure the natural wear rate of hip joint materials under the same conditions to help evaluate the improvement effects of new materials or lubricants.

[0093] 3. The control group can filter out the impact of the environment or experimental conditions on the results, making the test results more scientific and reliable.

[0094] 4. In some long-term wear tests, a control group provides a baseline that can be observed over time and helps distinguish the long-term wear characteristics of new materials or designs.

[0095] 5. Providing control group samples and test group samples can avoid the interference of external sudden factors on sample data, which is conducive to removing relevant experimental data when there is damage other than wear;

[0096] 6. Setting up a micro-separation platform can achieve self-alignment of the test sample and the control sample, reducing the error generated when installing the sample; at the same time, the micro-separation platform can also eliminate the constraint force in the horizontal plane between the test sample and the control sample, so that the vertical load is loaded and transmitted to both in equal amounts.

[0097] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. An artificial hip joint wear test system, comprising: A first linear motor can be used to apply a load vertically downward; A first clamp, used to clamp the control sample and driven by the first linear motor to reciprocate up and down in the vertical direction; A first load sensor is disposed between the first linear motor and the first fixture and is used to measure the load value applied to the control sample in real time; A follower platform is disposed between the first fixture and the micro-separation platform and connected to a counterweight block via a wire rope passing around a fixed pulley to just offset the predetermined weight so that the control sample and the test sample are subjected to the same vertical downward load; The micro-separation platform comprises a first slider guide mechanism that slides freely along a first direction in a horizontal plane and a second slider guide mechanism that slides freely along a second direction in the horizontal plane, wherein the first slider guide mechanism is integrally arranged on a slider of the second slider guide mechanism, and the first direction is perpendicular to the second direction; A second fixture, used to clamp the test sample; A second load sensor is disposed between the micro-separation platform and the second fixture and is used to measure the load value applied to the test sample in real time; and The three-axis rotation mechanism is connected to the second fixture and is used to apply a rotation force to the test sample in at least one direction of the three-axis directions of XYZ.

2. The artificial hip joint wear testing system according to claim 1 is characterized in that it also includes a workbench, the workbench is provided with two guide pillars, a movable crossbeam whose height position can be adjusted along the two guide pillars is arranged between the two guide pillars, and the first linear motor and the fixed pulley are fixed to the movable crossbeam.

3. The artificial hip joint wear testing system according to claim 1 or 2, characterized in that The first fixture and the second fixture each include a top seat and a bottom seat, and the control sample and the test sample are clamped between the top seat and the bottom seat.

4. The artificial hip joint wear testing system according to claim 3, characterized in that The three-axis rotation mechanism comprises: A first support frame and a second support frame arranged in parallel; A square outer frame; disposed between the first support frame and the second support frame; and A U-shaped frame connected to the inner side of the square outer frame; Wherein, the relative outer sides of the square outer frame are provided with X-axis output flanges, and the X-axis output flanges are rotatably connected to the first support frame and the second support frame respectively, and the first rotating motor fixed to the first support frame can drive the square outer frame to rotate around the X-axis via the X-axis output flange; The relative outer sides of the U-shaped frame are each provided with a Y-axis output flange, and the Y-axis output flanges are rotatably connected to the inner sides of the square outer frame, respectively, and the second rotary motor fixed on the square outer frame can drive the U-shaped frame to rotate around the Y-axis via the Y-axis output flange; A Z-axis output flange is rotatably connected within the U-shaped frame, and a third rotary motor fixed outside the U-shaped frame can drive the test sample to rotate around the Z-axis.

5. The artificial hip joint wear testing system according to claim 4, characterized in that The second support frame is provided with a first limiting device for limiting the rotation angle of the square outer frame, and the square outer frame is provided with a second limiting device for limiting the rotation angle of the U-shaped frame.

6. The artificial hip joint wear testing system according to claim 2, characterized in that The follower platform comprises a follower plate, and the two sides of the follower plate are respectively connected with a first sliding sleeve and a second sliding sleeve, and the first sliding sleeve and the second sliding sleeve are respectively and correspondingly sleeved on one of the two guide pillars so as to be freely slidable.

7. The artificial hip joint wear testing system according to claim 6, characterized in that The slider of the first slider guide rail mechanism is connected to the follower plate via the upper end plate, and the guide rail of the second slider guide rail mechanism is connected to the second fixture via the lower end plate.

8. The artificial hip joint wear testing system according to claim 7, characterized in that The micro-separation platform also includes an X-axis displacement sensor and a Y-axis displacement sensor, which are used to measure the displacement of the micro-separation platform in the X-axis direction and the Y-axis direction.

9. The artificial hip joint wear testing system according to claim 6, characterized in that It also includes a counterweight plate and two counterweight brackets fixed in parallel to the lower side of the movable crossbeam, and the counterweight bracket, fixed pulley, counterweight block, counterweight plate, follower platform and steel wire rope constitute a counterweight structure; there are two groups of fixed pulleys and they are respectively fixed to the sides of the two counterweight brackets, and each group of fixed pulleys includes two fixed pulleys; there are two steel wire ropes, and the first ends of them pass through the corresponding fixed pulley groups and are connected to the counterweight block through the lifting ring, and the second ends are connected to the follower platform, the counterweight plate is fixed to the bottom of the counterweight block, and the counterweight block can move up and down with the operation of the first linear motor.

10. The artificial hip joint wear testing system according to claim 9, characterized in that The number of the counterweight blocks and / or counterweight plates is adjustable, the control sample and the test sample have the same structure and receive the same load from the first linear motor, and the test sample also additionally receives the rotational force applied by the three-axis rotation mechanism.

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