CN219657341U - Clamping device for axial withdrawal force test of headless screw - Google Patents
Clamping device for axial withdrawal force test of headless screw Download PDFInfo
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- CN219657341U CN219657341U CN202320296956.5U CN202320296956U CN219657341U CN 219657341 U CN219657341 U CN 219657341U CN 202320296956 U CN202320296956 U CN 202320296956U CN 219657341 U CN219657341 U CN 219657341U
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- headless screw
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- 238000012360 testing method Methods 0.000 title claims abstract description 50
- 238000007586 pull-out test Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 210000000988 bone and bone Anatomy 0.000 description 8
- 238000000605 extraction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The utility model discloses a clamping device for an axial withdrawal force test of a headless screw, which comprises a base and a loading device arranged above the base, wherein the loading device is provided with a clamping device for clamping the headless screw, the clamping device comprises a nut structure for being fixed with the headless screw and a clamping piece for clamping the nut structure, a test block is arranged on the base below the loading device, the headless screw is driven by the loading device to be driven into or pulled out of the test block, the headless screw is fixed through the nut structure, the clamping effect is good, and the problem that the headless screw is easy to fall off is effectively solved.
Description
Technical Field
The utility model relates to the technical field of clamping devices for tests, in particular to a clamping device for a headless screw axial withdrawal force test.
Background
The metal bone screw provides a means for a surgeon to perform bone fixation operation, and is one of the most common means for treating fracture at present. According to the bone screw axial extraction force test device shown in YY/T14-2016 test method for axial extraction force of surgical implant metal bone screw, as shown in FIG. 1, a is a test block clamp and a base, b is a load, c is a loading device, d is a test block, e is a drill bushing, a general bone screw is provided with a clamped head, the screw is clamped and fixed by the loading device, and the screw is screwed into a simulated bone block for 20mm and then extracted when the axial extraction force of the screw is tested.
However, with the development of technology, in order to reduce the wound surface, more people like to use headless screws at present, but for some headless screws, the current loading device cannot effectively clamp and fix the screws.
Disclosure of Invention
In order to solve the technical problems, the utility model aims to provide the clamping device for the axial withdrawal force test of the headless screw, which can be matched with the threads of the screw, can meet the test conditions of screws with different length specifications and achieves the effective clamping and fixing effects.
In view of the above, an embodiment of the present utility model provides a clamping device for an axial pullout force test of a headless screw, including a base, a loading device disposed above the base, on which a clamping device for clamping the headless screw is disposed, the clamping device including a nut structure for screwing with the headless screw and a clamping member for clamping the nut structure, a test block being disposed on the base, the headless screw being driven by the loading device to drive or pull out the test block.
Further, the nut structure comprises a clamping head and a clamping column, wherein the clamping column extends downwards along the bottom of the clamping head, and the clamping column and the clamping head form an inverted boss structure.
Further, the inner wall of the clamping column is provided with internal threads matched with the threads of the headless screw.
Further, the length of the clamping post is matched with the length of the headless screw.
Further, the clamping piece is of a U-shaped structure, a clamping groove is formed in the bottom of the clamping piece, and the clamping groove is clamped on two sides of the bottom of the clamping head.
Further, the clamping piece is fixedly connected to a force application mechanism of the clamping device, and the force application mechanism is fixedly connected with the output end of the driving mechanism.
Further, the test device further comprises a drill sleeve, wherein a through groove for the headless screw to penetrate is formed in the drill sleeve, and the headless screw penetrates through the through groove and drills down into the test block.
The utility model has the beneficial effects that: the embodiment of the utility model provides a clamping device for an axial pullout force test of a headless screw, which comprises a base and a loading device arranged above the base, wherein the loading device is provided with a clamping device for clamping the headless screw, the clamping device comprises a nut structure for being fixed with the headless screw and a clamping piece for clamping the nut structure, a test block is arranged on the base, the headless screw is driven by the loading device to be driven into or pulled out of the test block, the headless screw is fixed through the nut structure, the clamping effect is good, and the problem that the headless screw is easy to fall off is effectively solved.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art bone screw axial pullout force test apparatus;
fig. 2 is a schematic structural diagram of a clamping device for axial withdrawal force test of a headless screw according to an embodiment of the present utility model;
fig. 3 is a schematic structural diagram of a clamping device in a clamping device for an axial pullout force test of a headless screw according to an embodiment of the present utility model;
fig. 4 is a cross-sectional view of a nut structure in a clamping device for an axial pullout force test of a headless screw according to an embodiment of the present utility model.
In the figure: 100. a headless screw; 1. a base station; 2. a loading device; 3. a clamping device; 30. a nut structure; 301. a clamping head; 302. a clamping column; 31. a clamping member; 310. a clamping groove; 4. a test block; 5. and (5) a drill sleeve.
Detailed Description
The embodiment of the utility model provides a clamping device for an axial withdrawal force test of a headless screw, which can be matched with threads of the screw, can meet the test conditions of screws with different length specifications, and achieves the effective clamping and fixing effects.
In order to make the objects, features and advantages of the present utility model more comprehensible, the technical solutions in the embodiments of the present utility model are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.
Examples:
fig. 1 is a schematic structural diagram of a conventional bone screw axial extraction force test device, which has the technical problem of instability and easy sliding when clamping a headless screw.
Fig. 2 is a schematic structural diagram of a clamping device for an axial pullout force test of a headless screw according to an embodiment of the present utility model, as shown in fig. 2, the clamping device for an axial pullout force test of a headless screw includes a base 1, a loading device 2 disposed above the base 1, a clamping device 3 for clamping the headless screw 100 is disposed on the loading device 2, the clamping device 3 includes a nut structure 30 for being screwed with the headless screw 100 and a clamping piece 31 for clamping the nut structure 30, a test block 4 is disposed on the base 1, and the headless screw 100 is driven by the loading device 2 to drive or pull out the test block 4.
In a specific embodiment, for testing the axial extraction force of the headless screw 100, the nut structure 30 of the clamping device 3 is designed, and the nut structure 30 is in threaded match with the headless screw 100 and is used for fixing the headless screw 100, so that the technical problem that the existing axial extraction force testing device of the headless screw 100 cannot firmly clamp the headless screw 100 is solved.
Further, the nut structure 30 includes a clamping head 301 and a clamping post 302, the clamping post 302 extends downward along the bottom of the clamping head 301, and the clamping post 302 and the clamping head 301 form an inverted boss structure.
Specifically, the nut structure 30 includes a clamping head 301 and a clamping post 302, where the clamping post 302 and the clamping head 301 are integrally formed to form an inverted boss structure, that is, the clamping post 302 extends downward along the bottom of the clamping head 301, in addition, the clamping head 301 may be designed as a flat cylindrical structure, the clamping post 302 is a long cylindrical structure, and an inner thread matching with the thread of the headless screw 100 is disposed on the inner wall of the clamping post 302, and the fixing of the headless screw 100 is achieved by engaging the inner thread on the inner wall of the clamping post 302 with the outer thread on the headless screw 100.
Further, the length of the clamping post 302 matches the length of the headless screw 100.
Specifically, the length of the clamping post 302 is adjustable, and clamping posts 302 of different lengths are designed according to the length of the headless screw 100, so as to adapt to clamping of the headless screws 100 of different lengths.
Further, the clamping member 31 has a U-shaped structure, a clamping groove 310 is formed at the bottom of the clamping member 31, and the clamping groove 310 is clamped at two sides of the bottom of the clamping head 301.
Specifically, the clamping member 31 has a U-shaped structure, and a clamping groove 310 is formed in the middle of the bottom of the clamping member 31, and the size of the clamping head 301 is larger than that of the clamping groove 310, so that the clamping head 301 is clamped on the clamping groove 310 to achieve fixation.
Further, the clamping member 31 is fixedly connected to a force applying mechanism of the clamping device 3, and the force applying mechanism is fixedly connected to an output end of the driving mechanism.
Specifically, the clamping member 31 is fixedly connected with the force application mechanism, the force application mechanism is fixedly connected with the output end of the driving mechanism, the driving mechanism drives the force application mechanism to press down the test block 4, the force application mechanism pushes the clamping member 31 to press down the nut structure 30, so that the headless screw 200 drills down the test block 4, then the driving mechanism drives the force application mechanism to pull up the clamping member 31, the clamping member 31 clamps the nut structure 30 to be pulled up, and the headless screw 100 is pulled out of the test block 4.
Further, the drill sleeve 5 is further included, a through groove for the headless screw 100 to penetrate is formed in the drill sleeve 5, and the headless screw 100 penetrates through the through groove and drills down into the test block 4.
Specifically, stability in the pressing stroke of the headless screw 100 is controlled by the drill bushing 5.
In summary, the embodiment of the utility model provides a clamping device for an axial pullout force test of a headless screw, which comprises a base, and a loading device arranged above the base, wherein the loading device is provided with a clamping device for clamping the headless screw, the clamping device comprises a nut structure for fixing the headless screw and a clamping piece for clamping the nut structure, a test block is arranged on the base below the loading device, the headless screw is driven by the loading device to be driven into or pulled out of the test block, the headless screw is fixed through the nut structure, the clamping effect is good, and the problem that the headless screw is easy to fall off is effectively solved.
The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (7)
1. The utility model provides a no head screw axial withdrawal force clamping device for test, its characterized in that, is including base (1), set up loading device (2) of base (1) top, be provided with on loading device (2) and be used for centre gripping no head screw (100) clamping device (3), clamping device (3) including be used for with no head screw (100) screw thread fixed nut structure (30) and be used for centre gripping clamping piece (31) of nut structure (30), test piece (4) have been placed on base (1), no head screw (100) are in under the drive of loading device (2) drive or pull out test piece (4).
2. The clamping device for the axial pullout force test of a headless screw according to claim 1, wherein the nut structure (30) comprises a clamping head (301) and a clamping post (302), the clamping post (302) extending downwardly along a bottom of the clamping head (301), the clamping post (302) and the clamping head (301) forming an inverted boss structure.
3. The clamping device for axial pullout force test of a headless screw according to claim 2, wherein the inner wall of the clamping post (302) is provided with internal threads matching the threads of the headless screw (100).
4. A headless screw axial pullout force testing clamp device according to claim 3, wherein the length of the clamp post (302) matches the length of the headless screw (100).
5. The clamping device for the axial pullout force test of the headless screw according to claim 2, wherein the clamping piece (31) has a U-shaped structure, a clamping groove (310) is formed in the bottom of the clamping piece (31), and the clamping groove (310) is clamped on two sides of the bottom of the clamping head (301).
6. The clamping device for the axial pullout force test of the headless screw according to claim 5, wherein the clamping piece (31) is fixedly connected to a force application mechanism of the clamping device (3), and the force application mechanism is fixedly connected with the output end of the driving mechanism.
7. The clamping device for the axial pullout force test of the headless screw according to claim 5, further comprising a drill bushing (5), wherein a through groove for the headless screw (100) to penetrate is arranged in the drill bushing (5), and the headless screw (100) penetrates through the through groove and drills down into the test block (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320296956.5U CN219657341U (en) | 2023-02-21 | 2023-02-21 | Clamping device for axial withdrawal force test of headless screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320296956.5U CN219657341U (en) | 2023-02-21 | 2023-02-21 | Clamping device for axial withdrawal force test of headless screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219657341U true CN219657341U (en) | 2023-09-08 |
Family
ID=87878293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320296956.5U Active CN219657341U (en) | 2023-02-21 | 2023-02-21 | Clamping device for axial withdrawal force test of headless screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219657341U (en) |
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2023
- 2023-02-21 CN CN202320296956.5U patent/CN219657341U/en active Active
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