CN209117481U - Test fixture - Google Patents
Test fixture Download PDFInfo
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- CN209117481U CN209117481U CN201821321772.5U CN201821321772U CN209117481U CN 209117481 U CN209117481 U CN 209117481U CN 201821321772 U CN201821321772 U CN 201821321772U CN 209117481 U CN209117481 U CN 209117481U
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- load bar
- locating slot
- sleeve
- test fixture
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Abstract
The utility model discloses a kind of test fixtures, comprising: the sliding part being set on bone nail that can be slided has positioning region on the sliding part；Load bar, the loading end of the load bar and the positioning region location fit；For applying stressed force application apparatus, the load bar is set to the driving end of the force application apparatus；For detecting the force snesor of the applied force of the force application apparatus.Test fixture provided by the utility model can effectively improve the accuracy of test result.
Description
Technical field
The utility model relates to technical field of medical equipment, in particular to a kind of test fixture.
Background technique
In bone surgery, need that bone plate and bone nail is made to cooperate implantation at an angle in the privileged site of human body.It is based on
Multi-angle plants the demand of nail, and universal lock fixed system is promoted.
But the mechanical strength of universal lock system decreases compared to common locking system, needs to cooperate nail-plate
The intensity of structure (bone plate and bone nail match structure) is tested.
As shown in Figure 1, current test fixture includes the force for applying stressed actuator 1, being set to actuator 1
The force snesor 2 at end, the upper fixture 3 for being set to the one end of sensor 2 far from actuator 1, the load bar being held in upper fixture 3
4 and the lower fixture 6 that is correspondingly arranged with load bar 4.The bone plate of nail-plate fit structure is held on fixture 6, and load bar 4 is matched to nail-plate
The bone nail 5 for closing structure applies pressure.Wherein, the spacing A between load bar 4 and bone plate and the distance between bone nail 5 and lower fixture 6
It is adjusted to Reasonable Parameters.It is pressed by load bar 4 to bone nail 5, and test nail-plate cooperation knot is obtained according to obtained relevant parameter
The intensity of structure.
But due to the bending of bone nail 5 in detection process, this allows for the contact position of load bar 4 and bone nail 5 and mode meeting
Additional axial force is brought to bone nail 5, which is the axial component along bone nail 5.This allows for nail-plate fit structure
Test process is interfered, so that test data cannot really react the bond strength of bone plate and bone nail 5, so that test
As a result accuracy is lower.
Therefore, test result accuracy how is improved, it has also become this field urgent problem to be solved.
Utility model content
In view of this, the present invention provides a kind of test fixtures, to improve test result accuracy.
To achieve the above object, the utility model provides the following technical solutions:
A kind of test fixture characterized by comprising
The sliding part being set on bone nail that can be slided has positioning region on the sliding part；
Load bar, the loading end of the load bar and the positioning region location fit；
For applying stressed force application apparatus, the load bar is set to the driving end of the force application apparatus；
For detecting the force snesor of the applied force of the force application apparatus.
It can be seen from the above technical scheme that test fixture provided by the utility model, starts force application apparatus, force dress
The driving end set drives load bar to move to the direction close to bone nail, and load bar is contacted with the sliding part positioning on bone nail.Pass through
Sliding part is set on bone nail, the loading end and positioning region location fit of load bar, during the test, the applied force of load bar
It acts on bone nail, is bent bone nail；Since what sliding part can slide is set on bone nail, load bar is opposite with sliding part fixed
Position, and sliding part can be as the bending of bone nail be relative to bone nail sliding, in order to adjust force position of the load bar on bone nail
It sets, effectively avoid or reduces load bar and give bone nail bring axial force, so that test data is truer, effectively increase test
As a result accuracy.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the utility model
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of test fixture；
Fig. 2 is the structural schematic diagram of the test fixture in the utility model embodiment；
Fig. 3 is the partial enlargement diagram of part A in Fig. 2；
Fig. 4 is the structural schematic diagram of the load bar in the utility model embodiment；
Fig. 5 is the structural schematic diagram of the sliding part in the utility model embodiment.
Specific embodiment
The utility model discloses a kind of test fixtures, to improve test result accuracy.
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
As Figure 2-Figure 5, the utility model embodiment provides a kind of test fixture, including 7 force application apparatus of sliding part,
Force snesor and load bar 4.What sliding part 7 can slide is set on bone nail 5, has positioning region on sliding part 7；Load bar 4
Loading end 41 and positioning region location fit.For force application apparatus for applying pressure, load bar is set to the driving end of force application apparatus；
Force snesor is used to detect the applied force of the force application apparatus, and applied force may be converted to the sensor of electric signal output.
Sensor may include sensing element and conversion element in one of the embodiments, wherein sensing element with apply
The contact of power device, can be with direct feeling to pressure；Conversion element can then be converted to the strain that sensing element is experienced or responded
Electric signal, for showing.Specifically, pressure sensor may include piezoresistive pressure sensor, ceramic pressure sensor, piezoelectricity
Pressure sensor, resistance strain type pressure sensor, inductance pressure transducer, capacitance pressure transducer, single-capacitor type pressure
Force snesor, differential capacitance type pressure sensor, resonance type pressure sensor, diaphragm pressure sensor or sapphire pressure sensing
Device.
Test fixture provided by the embodiment of the utility model starts force application apparatus, driving of the upper fixed part in force application apparatus
It is moved under the drive at end to the direction close to bone nail 5, and then load bar 4 is driven to move to bone nail 5, bone plate and bone nail 5 are mutual
Connection structure, load bar 4 are contacted with the positioning of sliding part 7 on bone nail 5.By the way that sliding part 7 is arranged on bone nail 5, load bar 4
Loading end 41 and positioning region location fit, during the test, the applied force of load bar 4 acts on bone nail 5, keeps bone nail 5 curved
It is bent；Since what sliding part 7 can slide is set on bone nail 5, load bar 4 and 7 relative positioning of sliding part, and sliding part 7 can
As the bending of bone nail 5 is slided relative to bone nail 5, in order to adjust contact position of the load bar 4 on bone nail 5, effectively avoid
Or reduce load bar 4 to 5 bring axial force of bone nail, so that test data more can really react the knot of bone plate and bone nail 5
Intensity is closed, the accuracy of test result is effectively increased.
In the present embodiment, positioning region is locating slot 71, and loading end 41 is the bulge-structure for protruding into locating slot 71.By upper
Setting is stated, effectively ensures locating effect.By above-mentioned setting, locating effect is effectively increased, also facilitates adding for positioning region
Work.
Positioning region can also be set to positioning protrusion, loading end 41 has the groove matched with positioning protrusion.
In order to improve sliding stability of the sliding part 7 on bone nail 5, the opposite slippage of sliding part 7 and bone nail 5 is avoided, is slided
Moving part 7 is sleeve；The centre bore of sleeve be can sliding sleeve be set to bone nail 5 on through-hole, positioning region is set on the outer wall of sleeve.
Sliding groove can also be set on the slider 7, and bone nail 5 is slidably matched with sliding groove.In the present embodiment, it is set on the outer wall of sleeve
The positioning region set is locating slot 71.
It is understood that the diameter L2 of the centre bore of sleeve is greater than the diameter of bone nail 5.In the present embodiment, L2=
3.5mm。
Further, in this embodiment sliding part be sleeve, also, positioning region be locating slot.Therefore, loading end is to stretch
Enter the bulge-structure of locating slot.Locating slot 71 is the annular groove being circumferentially arranged along sleeve.By above-mentioned setting, even if sleeve
It is rotated relative to bone nail 5, is also ensured that load bar 4 positions always with sliding part 7.It is of course also possible to which locating slot 71 is arranged
It is independent groove structure, the loading end 41 and 71 relative positioning of locating slot of load bar 4.
Sliding part 7 can also be set to the sliding block with open slot, open slot is slideably positioned on bone nail 5.Wherein, it is
Avoid sliding part 7 from falling off relative to bone nail 5, the opening of open slot can be made to be less than the diameter of bone nail 5, the inside of open slot away from
From the diameter for being greater than or equal to bone nail 5, in order to realize after bone nail 5 is located at the inside of open slot can with sliding part 7 there are phases
To sliding, and cannot be slipped by the opening of open slot.Such as "T"-shaped slot.
As depicted in figs. 3 and 5, center line of the annular groove perpendicular to sleeve.By above-mentioned setting, positioning effect is effectively ensured
Fruit.It is of course also possible to which the center line of annular groove and sleeve is made to be at certain angle of inclination setting.Wherein, when the slot cross-section of annular groove
When for center symmetrical structure, the central axis of annular groove is in the center line of sleeve；When the slot cross-section of annular groove is non-central right
When claiming structure, center line of the plane perpendicular to sleeve where the channel opening side of annular groove.In order to ensure the processing of locating slot 71, subtract
The diameter of the material quantity of few sleeve, sleeve increases along the direction close to locating slot 71.
Further, locating slot 71 is set at the axial centre of sleeve.By above-mentioned setting, so that right centered on sleeve
Claim structure, facilitates installation of the sleeve relative to bone nail 5.
As shown in Figures 4 and 5, the groove bottom of locating slot 71 is arc surface；The outer surface of loading end 41 is and locating slot 71
The spherical surface that matches of groove bottom.By above-mentioned setting, during ensuring that 5 stress of bone nail is curved, loading end 41 always with
71 location fit of locating slot.Wherein, when the groove bottom of annular groove is arc surface, the center line of groove bottom is in annular groove
Heart line.In the present embodiment, the central axis of annular groove is in the center line of sleeve.
The slot cross-section of locating slot 71 can also be made to be set as trapezoidal, triangle, rectangle or T-shaped etc..
In the present embodiment, the diameter of the groove bottom (arc surface) of locating slot 71 is D ', the outer surface (ball of loading end 41
Face) diameter be D.Preferably, D '=D.In the present embodiment, D '=D=1.5mm.
It can also make D ' > D, it is only necessary to ensure that loading end 41 can rotate in locating slot 71.
In order to avoid friction loss, sliding part 7 and the relatively stuck situation of bone nail 5 are avoided, sliding part 7 is Elastic Sliding
Part.Rigid sliding part can also be set by sliding part 7, be no longer described in detail herein and within protection scope.
Test fixture provided by the embodiment of the utility model further includes upper fixed part and lower fixed part.Upper fixed part setting
In the driving end of force application apparatus, for fixing load bar；Lower fixed part is correspondingly arranged with load bar, for fixing bone plate.
It is of course also possible to be not provided with fixed part.Load bar 4 can be fixed on force by the modes such as welding or being bonded
The driving end of device；Can also be processed as one the drive rod of force application apparatus and load bar 4 formula structure.
Similarly, lower fixed part can also be not provided with.Pass through the relevant stationary part on the processing platform of force application apparatus itself
Fixed bone plate, in order to position bone nail 5.It is, of course, also possible to clamp bone plate and bone nail fit structure by manpower or tool, surveying
During examination, it will be clamped under bone plate and the mobile driving end for setting force application apparatus of bone nail fit structure by manual operation.
Further, force snesor is set between the driving end of force application apparatus and upper fixed part.That is, force snesor is arranged
In the driving end of force application apparatus, upper fixed part is set to the side at driving end of the force snesor far from force application apparatus.Certainly, may be used
Force snesor is set to other positions, e.g., force snesor is set at upper fixture, is directly carried out to the applied force of load bar
Detection.It may be arranged as other structures, not repeated them here and within protection scope.
In the present embodiment, force application apparatus is actuator.It can certainly be using other equipment as force application apparatus, it is only necessary to
Ensure that it drives end that can move relative to lower fixed part.
Upper fixed part is the upper fixture for clamping the load bar.Or bolt fastening structure or snap connection knot
Structure etc..
Lower fixed part is the lower fixture for clamping bone plate.It may be bolt fastening structure or buckle connecting structure etc..
In test fixture provided in this embodiment, load bar 4 includes the gripping section being held in the upper fixture of test fixture
42 and the loaded segment 43 with loading end 41；The center line of gripping section 42 is not overlapped with the center line of loaded segment 43.By above-mentioned
Setting, it is ensured that the adjustment of force application location of the load bar 4 on bone nail 5, that is, the practical force application location of load bar 4 is gripping section
42 direction of motion.
It is of course also possible to be overlapped the center line of gripping section 42 and the center line of loaded segment 43, that is, the center of load bar 4
Line is straight line.
As shown in figure 4, the center line of gripping section 42 and the center line of loaded segment 43 are parallel to each other.By above-mentioned setting, just
In the force application location for adjusting load bar 4.
In the present embodiment, the spacing L1=L+1/2H between the center line of gripping section 42 and the center line of loaded segment 43；
Wherein, L be loaded segment 43 center line to bone plate distance；H is the thickness of bone plate.By above-mentioned setting, although load bar 4 is logical
It crosses sliding part 7 and is contacted with the position that bone nail 5 is located at outside bone plate, actual loading position is the cooperation position of bone plate and bone nail 5, into
One step improves measuring accuracy.
Test fixture provided by the embodiment of the utility model, as follows in the static buckling testing procedure of nail-plate integrated structure:
1, bone nail 5 is pressed into certain angle (unspecified angle in 0 °~15 °) using nail device in angle or other related tools
It screws in bone plate, and power is screwed to the application of bone nail 5 using corresponding torque spanner or corresponding tool, form nail-plate integrated structure.
2, the bone plate of nail-plate integrated structure is clamped in lower fixture, sets bone nail 5 apart from lower clamp distance first
Size (such as 1cm), and load bar 4 is accommodated with upper fixture, apply the shearing force pushed, the point of application to the sleeve in 5 bar portion of bone nail
The distance of lower plane apart from bone plate is A (such as 4mm)；Drive ram is applied with centainly pushing speed (such as 1mm/min) to bone nail 5
Add the shearing force of pushing.
3, it is continuously applied lower pressure, until force value is reduced to certain proportion (such as 50%) or the pushing of bone nail 5 of maximum, force
Distance reaches certain size (such as 2mm), stops test, and the deformation force of acquisition units size (such as 1mm), maximum, force and corresponding
The data such as the deformation force of depression distance and 2mm.
Wherein, L1=L+1/2H；L be loaded segment 43 center line to the bone plate distance；H is the thickness of bone plate.It is logical
Above-mentioned setting is crossed, facilitates operation in order to test.Also, the internal diameter of sleeve and the diameter of 5 bar portion of bone nail match.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
Claims (10)
1. a kind of test fixture characterized by comprising
The sliding part being set on bone nail that can be slided has positioning region on the sliding part；
Load bar, the loading end of the load bar and the positioning region location fit；
For applying stressed force application apparatus, the load bar is set to the driving end of the force application apparatus；
For detecting the force snesor of the applied force of the force application apparatus.
2. test fixture as described in claim 1, which is characterized in that the positioning region is locating slot, and the loading end is to stretch
Enter the bulge-structure of the locating slot.
3. test fixture as described in claim 1, which is characterized in that the sliding part is sleeve；
The centre bore of the sleeve be can sliding sleeve be set to the bone nail on through-hole, the positioning region is set to the sleeve
On outer wall.
4. test fixture as claimed in claim 3, which is characterized in that the positioning region is locating slot, and the loading end is to stretch
Enter the bulge-structure of the locating slot；
The locating slot is the annular groove being circumferentially arranged along the sleeve.
5. test fixture as claimed in claim 4, which is characterized in that center line of the annular groove perpendicular to the sleeve.
6. test fixture as claimed in claim 3, which is characterized in that the positioning region is locating slot, and the loading end is to stretch
Enter the bulge-structure of the locating slot；
The diameter of the sleeve increases along the direction close to the locating slot；And/or the locating slot is set to the sleeve
At axial centre.
7. test fixture as described in claim 1, which is characterized in that the sliding part is elastic sliding part.
8. test fixture as described in claim 1, which is characterized in that further include:
It is set to the driving end of the force application apparatus, for fixing the upper fixed part of the load bar；
It is correspondingly arranged with the load bar, for fixing the lower fixed part of bone plate.
9. such as the described in any item test fixtures of claim 1-8, which is characterized in that the load bar includes being held on test work
Gripping section in the upper fixture of dress and the loaded segment with the loading end；
The center line of the gripping section is not overlapped with the center line of the loaded segment.
10. test fixture as claimed in claim 9, which is characterized in that the center line of the gripping section and the loaded segment
Center line is parallel to each other；
Spacing L1=L+1/2H between the center line of the gripping section and the center line of the loaded segment；
Wherein, L be the loaded segment center line to bone plate distance；
H is the thickness of bone plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821321772.5U CN209117481U (en) | 2018-08-14 | 2018-08-14 | Test fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821321772.5U CN209117481U (en) | 2018-08-14 | 2018-08-14 | Test fixture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209117481U true CN209117481U (en) | 2019-07-16 |
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ID=67197061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821321772.5U Active CN209117481U (en) | 2018-08-14 | 2018-08-14 | Test fixture |
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| CN (1) | CN209117481U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113984516A (en) * | 2021-05-25 | 2022-01-28 | 合泰盟方电子（深圳）股份有限公司 | Method and device for detecting corner strength of inductance product |
-
2018
- 2018-08-14 CN CN201821321772.5U patent/CN209117481U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113984516A (en) * | 2021-05-25 | 2022-01-28 | 合泰盟方电子（深圳）股份有限公司 | Method and device for detecting corner strength of inductance product |
| CN113984516B (en) * | 2021-05-25 | 2024-03-22 | 合泰盟方电子（深圳）股份有限公司 | Inductance product corner strength detection method and detection device thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | "change of name, title or address" |
Address after: 430065, Tsing Ling Town Industrial Zone, Hongshan District, Hubei, Wuhan Province, No. 18 Patentee after: Wuhan Mindray Technology Co., Ltd Address before: 430070 Hubei, Wuhan Ling Ling Industrial Park, green Ling Road, No. 18, Hongshan Patentee before: WUHAN DRAGONBIO ORTHOPEDIC PRODUCTS Co.,Ltd. |
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| CP03 | "change of name, title or address" |