CN215492414U - Artificial knee joint wear testing machine - Google Patents
Artificial knee joint wear testing machine Download PDFInfo
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- CN215492414U CN215492414U CN202121908171.6U CN202121908171U CN215492414U CN 215492414 U CN215492414 U CN 215492414U CN 202121908171 U CN202121908171 U CN 202121908171U CN 215492414 U CN215492414 U CN 215492414U
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Abstract
The application discloses artifical knee joint abrasion tester, it includes: the workbench, the second sensor and the swing mechanism; four guide posts and a horizontal top plate are arranged on the workbench; the guide posts are arranged in a rectangular shape; the horizontal top plate is fixed with the top end of the guide pillar; a cam is arranged on the horizontal top plate; the cam is connected with the first motor; the cam is connected with the transmission shaft, the transmission shaft is connected with the spring, and the spring is propped against the connecting plate; the connecting plate is provided with a first sensor and is connected with the middle plate through a telescopic column; the middle plate is movably connected with four guide posts; the middle plate is provided with a first sensor; the middle plate is connected with the left fixing plate and the right fixing plate; a second motor is arranged on the left fixing plate; the second motor is connected with the swinging plate; the swing plate is movably connected with the right fixed plate; the swing plate is provided with a second clamp; a pulley is arranged on the horizontal top plate; the middle plate is connected with a balancing weight through a steel wire rope; the steel wire rope is wound around the pulley; and a driving second sensor is arranged above the bottom plate to swing. More comprehensive wear test data can be obtained.
Description
Technical Field
The application relates to the technical field of medical equipment testing, in particular to an artificial knee joint abrasion testing machine.
Background
With the progress of the technology, the artificial frame body is implanted into the human body to replace the bone joint to help the patient to obtain the free mobility, which is a common technology in the medical field at present. After the artificial prosthesis is implanted into a human body, the artificial prosthesis can generate relative motion with the self bone and tissue of the human body in the service process. In the process, if the artificial frame body is abraded, the generated small particles can be retained in the human body and cause health risks. Therefore, the artificial prosthesis is required to be subjected to wear tests after being manufactured. The artificial knee joint wear test in the prior art mainly comprises a comprehensive wear test and a joint simulation test. The joint simulation test is mainly carried out on various disc-cutting type friction and wear testing machines in a sliding contact mode. The problems existing in the technical scheme are as follows: in addition, the human knee joint motion mode is a complex multi-freedom motion mode combining flexion, rolling, sliding, lateral movement and axial rotation, and the conventional cutting disc type friction and wear testing machine is not enough to test the friction and wear performance. In addition, in the prior art, a single sample to be detected is detected, so that detection interference caused by external burst factors cannot be eliminated. Therefore, how to develop a new artificial knee joint wear tester to overcome the above problems is a direction that needs to be studied by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The application provides an artifical knee joint abrasion testing machine can avoid the interference of outside proruption factor, makes artifical knee joint sample realize being close to the various motion mode of natural knee joint simultaneously, obtains more comprehensive abrasion test data.
The technical scheme is as follows:
an artificial knee joint wear tester, comprising: a work table; the upper end face of the workbench is provided with four guide pillars which are equal in length, extend in the vertical direction respectively and are arranged in a rectangular shape; the top ends of the four guide columns are respectively connected with a horizontal top plate; a cam is arranged on the horizontal top plate; the cam is connected with the first motor; the first motor is used for driving the cam to rotate; the cam is connected with the upper end of the transmission shaft and is used for driving the transmission shaft to reciprocate along the vertical direction; the lower end of the transmission shaft is connected with the upper end of the spring, and the lower end of the spring is propped against the upper end face of the connecting plate; the lower end face of the connecting plate is provided with a telescopic column, and the connecting plate is connected with the middle plate through the telescopic column; four corners of the middle plate are respectively movably connected to the four guide posts; a first sensor is arranged on the upper end face of the middle plate, a first placing groove is formed in the first sensor, and the first placing groove is used for placing comparison samples; the first sensor is used for sensing and comparing the pressure value applied to the sample; the middle plate is respectively connected with the left fixing plate and the right fixing plate through bolts; a second motor is arranged on the left fixing plate; the second motor is connected with the swinging plate and is used for driving the swinging plate to reciprocate along the horizontal direction; the swinging plate is movably connected with the right fixed plate; a pulley block is arranged on the horizontal top plate; the middle plate is connected with one end of a steel wire rope, and the other end of the steel wire rope penetrates through the pulley block to be connected with a balancing weight; the workbench is also provided with a positioning seat and a swinging mechanism; the positioning seat is positioned below the middle plate, a second placing groove is formed in the positioning seat, and the second placing groove is used for placing a sample to be tested; a second sensor is arranged below the positioning seat and used for sensing the pressure value of the sample to be detected; the swing mechanism is connected with the positioning seat and used for driving the positioning seat to swing.
By adopting the technical scheme: the cam makes the transmission shaft down remove at rotatory in-process, and the transmission shaft passes through the spring and conducts pressure to connecting plate and flexible post, and flexible post produces the compression at this in-process, and the sample is compared in the downside oppression of connecting plate, and the synchronous downstream of medium plate drives the synchronous downstream of swing board simultaneously for the downside of swing board oppresses the sample that awaits measuring in step. Therefore, the comparison sample and the sample to be detected synchronously receive the same pressure value, so that the data comparison effect is achieved, and the interference of external burst factors on the sample data is avoided. In the process, the position of the swing plate is finely adjusted in the horizontal direction by arranging the second motor, so that the center of the swing plate is aligned with a sample to be detected and pressed down, and the obtained comparison data is optimized. The swing mechanism is arranged to realize the left-right swing of the sample to be tested in the detection process, so that the wear test of the sample is closer to various motion modes of a natural knee joint, and more comprehensive wear test data is obtained. After the friction test is completed, the middle plate is pulled back to the initial position by operating the counterweight.
Preferably, in the artificial knee joint wear testing machine: the swing mechanism comprises a third motor, a disc and a rocker; the disc is coaxially arranged on a motor shaft of the third motor; the edge of the disc is movably connected with one end of a rocker, and the other end of the rocker is movably connected with the positioning seat.
By adopting the technical scheme: when the third motor is driven, the disc coaxially arranged on the motor shaft is driven to rotate, and one end of the rocker rotates synchronously along with the rotation of the disc. Because the length of the rocker is fixed, the positioning seat can do reciprocating left-right swinging motion under the transmission action of the rocker.
More preferably, in the artificial knee joint wear testing machine: the swing mechanism further comprises a guide rail and a chassis; the positioning seat is movably arranged on the chassis; the chassis is embedded on the guide rail.
By adopting the technical scheme: the chassis is moved on the guide rail, so that the relative position between the disc and the positioning seat is finely adjusted, and the amplitude of the left-right swing of the positioning seat under the transmission action of the rocker is indirectly adjusted.
More preferably, in the artificial knee joint wear testing machine: still include the outer frame body, the outer frame body is located the locating frame, positioning seat and the swing mechanism outside.
By adopting the technical scheme: the outer frame body is arranged to protect the guide pillar, the positioning seat and the swinging mechanism from the outside.
Still more preferably, in the artificial knee joint wear testing machine described above: the bottom of the workbench is provided with universal wheels and liftable feet.
By adopting the technical scheme: the universal wheels are arranged to realize rolling movement of the artificial knee joint abrasion testing machine. The lifting ground feet are arranged to lift the whole workbench after the artificial knee joint wear testing machine moves to the designated position, so that the universal wheels leave the ground, and the workbench is guaranteed to be stable and immovable in the testing process.
Compared with the prior art, the artificial knee joint sample has the advantages that the structure is simple, the realization is easy, the artificial knee joint sample can simulate and make the natural human knee joint to make various motion modes when the abrasion test is carried out, and therefore more comprehensive abrasion test data can be obtained.
Drawings
FIG. 1 is a perspective view of example 1, in which a steel wire rope and a sample to be measured are omitted;
FIG. 2 is a schematic view of the second motor and wobble plate of FIG. 1;
FIG. 3 is a schematic structural diagram of the swing mechanism of FIG. 1;
FIG. 4 is a schematic side view of FIG. 1;
fig. 5 is a schematic front view of fig. 1, in which a sample to be tested is supplemented.
The correspondence between each reference numeral and the part name is as follows:
1. a work table; 2. a guide post; 3. a horizontal top plate; 4. a cam; 5. a first motor; 6. a drive shaft; 7. a spring; 8. a connecting plate; 9. a telescopic column; 10. a middle plate; 11. a first sensor; 12. a left fixing plate; 13. a right fixing plate; 14. a second motor; 15. a swing plate; 16. a pulley; 17. a balancing weight; 18. positioning seats; 19. a second sensor; 20. a third motor; 21. a disc; 22. a rocker; 23. a guide rail; 24. a chassis; 25. an outer frame body; 26. a universal wheel; 27. the ground feet can be lifted; 28. comparing the samples; 29. and (5) testing the sample to be tested.
Detailed Description
Examples 1 of the present application are shown in fig. 1-5:
an artificial knee joint wear tester, comprising: a work table 1; the bottom of the workbench 1 is provided with universal wheels 26 and liftable feet 27.
The upper end surface of the workbench 1 is provided with four guide pillars 2, and the four guide pillars 2 are equal in length, extend along the vertical direction respectively and are arranged in a rectangular shape; the top ends of the four guide columns 2 are respectively connected with a horizontal top plate 3; the horizontal top plate 3 is provided with a cam 4; the cam 4 is connected with a first motor 5; the first motor 5 is used for driving the cam 4 to rotate; the cam 4 is connected with the upper end of the transmission shaft 6 and is used for driving the transmission shaft 6 to reciprocate along the vertical direction; the lower end of the transmission shaft 6 is connected with the upper end of a spring 7, and the lower end of the spring 7 is propped against the upper end face of the connecting plate 8; the lower end face of the connecting plate 8 is provided with a telescopic column 9, and the connecting plate 8 is connected with a middle plate 10 through the telescopic column 9; four corners of the middle plate 10 are respectively movably connected to the four guide posts 2; a first sensor 11 is arranged on the upper end face of the middle plate 10, and a first placing groove is arranged on the first sensor 11 and used for placing a comparison sample 28; the first sensor 11 is used for sensing the pressure value to which the comparison sample 28 is subjected; the middle plate 10 is respectively connected with a left fixing plate 12 and a right fixing plate 13 through bolts; a second motor 14 is arranged on the left fixing plate 12; the second motor 14 is connected with the swinging plate 15 and is used for driving the swinging plate 15 to reciprocate along the horizontal direction; the swinging plate 15 is movably connected with the right fixing plate 13; 16 groups of pulleys are arranged on the horizontal top plate 3; the middle plate 10 is connected with one end of a steel wire rope, and the other end of the steel wire rope penetrates through a pulley 16 group to be connected with a balancing weight 17; the workbench 1 is also provided with a positioning seat 18 and a swinging mechanism; the positioning seat 18 is positioned below the middle plate 10, and a second placing groove is formed in the positioning seat 18 and used for placing a sample 29 to be tested; a second sensor 19 is arranged below the positioning seat 18, and the second sensor 19 is used for sensing the pressure value of the sample 29 to be detected; the swing mechanism is connected with the positioning seat 18 and is used for driving the positioning seat 18 to swing.
Specifically, the method comprises the following steps: the swing mechanism comprises a third motor 20, a disc 21, a rocker 22, a guide rail 23 and a chassis 24; the positioning seat 18 is movably arranged on the chassis 24; the chassis 24 is mounted on the guide rail 23 in a snap-fit manner. The disc 21 is coaxially arranged on a motor shaft of the third motor 20; the edge of the disc 21 is movably connected with one end of a rocker 22, and the other end of the rocker 22 is movably connected with the positioning seat 18. The device also comprises an outer frame body 25, wherein the outer frame body 25 is positioned outside the guide post 2, the positioning seat 18 and the swinging mechanism.
In this example: the first sensor 11 and the second sensor 19 both adopt a weighing sensor NS-TH.
In practice, the working process is as follows:
the comparison sample 28 is first mounted on the first placement tank, while the sample 29 to be measured is mounted on the second placement tank. Then, the second motor 14 is started, and the second motor 14 drives the swing plate 15 to move in the horizontal direction, so that the pre-stressed point is aligned with the center of the sample 29 to be tested. Then, the first motor 5 is started, the first motor 5 drives the cam 4 to rotate, the cam 4 pushes the transmission shaft 6 to move downwards in the rotating process, the transmission shaft 6 transmits the pressure to the connecting plate 8 through the spring 7, and meanwhile the spring 7 compresses. Meanwhile, the telescopic column 9 is stressed and compressed in the process, so that the plate distance between the connecting plate 8 and the middle plate 10 is reduced. Meanwhile, the lower side surface of the connecting plate 8 presses the comparison sample 28, meanwhile, the middle plate 10 is forced to move downwards, the middle plate 10 drives the swing plate 15 to synchronously move downwards, so that the swing plate 15 presses the sample 29 to be detected, and the sample 29 to be detected is synchronously subjected to the same pressure value as the comparison sample 28. At this time, the first sensor 11 and the second sensor 19 synchronously output pressure value readings of the sample to be measured 29 and the comparison sample 28 to achieve the effect of data comparison, so that the interference of external burst factors on the sample data is avoided. In the above experiment process, the third motor 20 in the swing mechanism is started, and the rocker 22 drives the mounting seat to swing left and right, so that the abrasion test of the sample is closer to various movement modes of the natural knee joint, and more comprehensive abrasion test data is obtained. After the friction test is completed, the middle plate 10 is stretched back to the original position by operating the weight 17.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (5)
1. An artificial knee joint wear tester, comprising: a work table;
the upper end face of the workbench is provided with four guide pillars which are equal in length, extend in the vertical direction respectively and are arranged in a rectangular shape; the top ends of the four guide columns are respectively connected with a horizontal top plate;
a cam is arranged on the horizontal top plate; the cam is connected with the first motor; the first motor is used for driving the cam to rotate; the cam is connected with the upper end of the transmission shaft and is used for driving the transmission shaft to reciprocate along the vertical direction; the lower end of the transmission shaft is connected with the upper end of the spring, and the lower end of the spring is propped against the upper end face of the connecting plate; the lower end face of the connecting plate is provided with a telescopic column, and the connecting plate is connected with the middle plate through the telescopic column;
four corners of the middle plate are respectively movably connected to the four guide posts; a first sensor is arranged on the upper end face of the middle plate, a first placing groove is formed in the first sensor, and the first placing groove is used for placing comparison samples; the first sensor is used for sensing and comparing the pressure value applied to the sample; the middle plate is respectively connected with the left fixing plate and the right fixing plate through bolts; a second motor is arranged on the left fixing plate; the second motor is connected with the swinging plate and is used for driving the swinging plate to reciprocate along the horizontal direction; the swinging plate is movably connected with the right fixed plate; a pulley block is arranged on the horizontal top plate; the middle plate is connected with one end of a steel wire rope, and the other end of the steel wire rope penetrates through the pulley block to be connected with a balancing weight;
the workbench is also provided with a positioning seat and a swinging mechanism; the positioning seat is positioned below the middle plate, a second placing groove is formed in the positioning seat, and the second placing groove is used for placing a sample to be tested; a second sensor is arranged below the positioning seat and used for sensing the pressure value of the sample to be detected; the swing mechanism is connected with the positioning seat and used for driving the positioning seat to swing.
2. The artificial knee joint wear tester of claim 1, wherein: the swing mechanism comprises a third motor, a disc and a rocker; the disc is coaxially arranged on a motor shaft of the third motor; the edge of the disc is movably connected with one end of a rocker, and the other end of the rocker is movably connected with the positioning seat.
3. The artificial knee joint wear tester of claim 1, wherein: the swing mechanism further comprises a guide rail and a chassis; the positioning seat is movably arranged on the chassis; the chassis is embedded on the guide rail.
4. The artificial knee joint wear tester according to claim 2, wherein: the outer frame body is positioned on the outer sides of the guide pillar, the positioning seat and the swinging mechanism.
5. The artificial knee joint wear tester of claim 4, wherein: the bottom of the workbench is provided with universal wheels and liftable feet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121908171.6U CN215492414U (en) | 2021-08-13 | 2021-08-13 | Artificial knee joint wear testing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121908171.6U CN215492414U (en) | 2021-08-13 | 2021-08-13 | Artificial knee joint wear testing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215492414U true CN215492414U (en) | 2022-01-11 |
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ID=79759818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121908171.6U Active CN215492414U (en) | 2021-08-13 | 2021-08-13 | Artificial knee joint wear testing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215492414U (en) |
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2021
- 2021-08-13 CN CN202121908171.6U patent/CN215492414U/en active Active
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