CN206573384U - The fixture determined for bone plate bending strength and equivalent bending stiffness - Google Patents
The fixture determined for bone plate bending strength and equivalent bending stiffness Download PDFInfo
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- CN206573384U CN206573384U CN201720130387.1U CN201720130387U CN206573384U CN 206573384 U CN206573384 U CN 206573384U CN 201720130387 U CN201720130387 U CN 201720130387U CN 206573384 U CN206573384 U CN 206573384U
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Abstract
The utility model discloses a kind of fixture determined for bone plate bending strength and equivalent bending stiffness, belong to bone plate quality inspection technical field, the fixture includes upper fixture and the lower clamp being used in conjunction with each other, upper fixture includes upper fixture body, the lower surface of upper fixture body is provided with two downwardly projecting inner side roll shafts, and the lower surface of inner side roll shaft is arcwall face；Lower clamp includes lower clamp body, and the upper surface of lower clamp body is provided with two outside roll shafts protruding upward, and the upper surface of outside roll shaft is arcwall face；Three displacement transducers are set side by side between two outside roll shafts, the displacement transducer positioned at both sides is corresponding with two inner side roll shafts respectively.The utility model improves the accuracy of testing efficiency and test result, reduces testing cost.
Description
Technical field
The utility model is related to bone plate quality inspection technical field, specifically a kind of to be used for bone plate bending strength
The fixture determined with equivalent bending stiffness, the bending strength and equivalent bending stiffness being particularly suitable for use in using four-point method to bone plate
It is measured.
Background technology
Bone plate is state key supervision high risk medical instrument, is the shape according to skeleton, according to Bionic Design
Fixing device, the orthopaedic disease commonly used to treat fixation for treatment the need for a variety of causes causes.Before it comes into operation
Quality inspection it is extremely important, the physical rehabilitation situation with patient is closely related.Clinical suspicious Medical devices adverse event is main
Show as Plate break, bending, loosening etc..
Therefore, the indexs such as bending strength, the equivalent bending stiffness of performance generation material impact of bone plate are all needed
Carry out strict detection.
At present, the test method that measure bone plate bending strength and equivalent bending stiffness are generally used has two kinds：1) two
The corresponding position measurement deflection value of linear center between individual inner side roll shaft；2) in the correspondence position measurement of two inner sides roll shaft center
Deflection value.Then its bending strength and equivalent bending stiffness are calculated according to corresponding formula, present method is in concrete operations
Have the following disadvantages：
In continuous mode, it is necessary to which sample is depressed into fracture or substantially surrender when applying test force, based on this, determine
After one group of above-mentioned deflection value, the sample will be scrapped, and determine another group of deflection value, it is necessary to take a sample in addition.At present
One bone plate of testing program be only capable of measure one group of deflection value, it is impossible to realize simultaneously measure two groups of deflection values.Even if with a collection of
Can also there is individual difference between secondary product, different samples, it is impossible to contrast the otherness of two kinds of test method measurement results,
It is unfavorable for accurate, science, objective appraisal bone plate quality.
Utility model content
For above-mentioned deficiency of the prior art, the purpose of this utility model is to provide a kind of strong for synthetism plate benging
The fixture that degree and equivalent bending stiffness are determined, the fixture can realize the amount of deflection that two kinds of test methods are determined on same sample
It is worth and records two groups of load-deflection curves, corresponding bending strength and equivalent flexural is provided according to corresponding calculation formula simultaneously
Rigidity, improves the degree of accuracy of efficiency and testing result, reduces cost.
The technical scheme in the invention for solving the technical problem is：It is used for synthetism plate benging there is provided one kind strong
The fixture that degree and equivalent bending stiffness are determined, including the upper fixture and lower clamp being used in conjunction with each other, upper fixture include upper fixture
Body, the lower surface of upper fixture body is provided with two downwardly projecting inner side roll shafts, and the lower surface of inner side roll shaft is equal diameter cylinder；
Lower clamp includes lower clamp body, the upper surface of lower clamp body provided with two outside roll shafts protruding upward, outside roll shaft it is upper
Surface is equal diameter cylinder；Three displacement transducers, the displacement sensing positioned at both sides are set side by side between two outside roll shafts
Device is corresponding with two inner side roll shafts respectively.
Three displacement transducers are respectively left side displacement transducer, middle displacement transducer and right side displacement transducer, in
Between displacement transducer be located at two outside roll shaft between center, left side displacement transducer and right side displacement transducer are right respectively
Answer two inner side roll shafts.
Further, inner side roll shaft is arranged on upper fixture body by upper adjustable plate, and the lower surface of upper fixture body is provided with
Upper hopper chute, upper adjustable plate can drive inner side roll shaft to slide and realized in the optional position of upper hopper chute along upper hopper chute and position.Upper regulation
Plate can drive inner side roll shaft movement, can be according to different rule so as to the distance between convenient two inner side roll shafts of regulation
The bone plate of lattice is adjusted, and expands the versatility of fixture.
Further, upper hopper chute is that matched upper mounting blocks are provided with T-slot, upper hopper chute, and upper mounting blocks can edge
Upper hopper chute is slided；Upper adjustable plate is arranged on upper mounting blocks by upper regulating bolt.Upper mounting blocks are located at wider at the top of T-slot
Step in part, T-slot can form spacing to upper mounting blocks, it is to avoid it comes off.
Further, upper adjustable plate and inner side roll shaft are split-type structural, the two ends of inner side roll shaft respectively by spring with
Upper adjustable plate is connected.Upper adjustable plate and inner side roll shaft are split-type structural, and same upper adjustable plate can coordinate different-diameter
Roll shaft, be convenient for changing the operation that roll shaft makes, also reduce the cost of fixture, improve the versatility of fixture.Set spring will
Inner roller axis limit is on upper adjustable plate, it is to avoid inner side roll shaft comes off, meanwhile, spring is arranged on two ends, do not interfere with
The working face of side roller axle.
Further, outside roll shaft is arranged on the lower clamp body by lower adjustable plate, on the upper surface of lower clamp body
Provided with gliding groove, lower adjustable plate can drive outside roll shaft to slide and realized in the optional position of gliding groove along gliding groove and position.Under
Adjustable plate can drive outside roll shaft movement, can be according to not so as to the distance between convenient two outside roll shafts of regulation
The bone plate of same specification is adjusted, and expands the versatility of fixture.
Further, matched lower mounting blocks are provided with gliding groove, lower mounting blocks can be slided along gliding groove；Lower
Section plate is L shaped plate, and the lateral part of lower adjustable plate is arranged on lower mounting blocks by lower regulating bolt, longitudinal portion of lower adjustable plate
The top divided is provided with the outside roll shaft.Lower adjustable plate is installed by lower regulating bolt, can after lower regulation bolt looseness
To realize the movement of lower adjustable plate, so that the regulation of outside roll shaft position is realized, after correct position is adjusted to, by lower regulation spiral shell
Bolt is tightened, and realizes the positioning of lower adjustable plate, so as to realize the positioning of outside roll shaft, bolt mounting means is easy to operate, into
This is low.
Further, lower adjustable plate and the outside roll shaft are split-type structural, and lower adjustable plate is matched somebody with somebody with the outside roll shaft
One end or two ends at conjunction are provided with roll shaft stopping means.Roll shaft stopping means is used can be by outer side roller on lower adjustable plate
Laminated structure, platy structure or block structure that the end of axle is blocked, keep off in the end of outer side roller axle avoiding it in axis
Direction is moved, under being placed on that can be consolidated under gravity due to outside roll shaft on adjustable plate, thus lower adjustable plate with
Attachment structure need not be set between the roll shaft of outside.
Further, the outside of lower adjustable plate is provided with least two limiting plates, and the top of limiting plate is protruded in outer side roller axle
Top, the bottom of limiting plate is arranged in the limiting plate regulating tank on lower adjustable plate by screw, and limiting plate regulating tank is water
Rise as high as the banks.Provided with limiting plate, tested bone plate sample is located between two limiting plates when in use, and two limiting plates are by specimen holder
Firmly, it is ensured that the axis of sample and inner side roll shaft and the axis perpendicular of outside roll shaft, it is to avoid sample is shifted over.
Further, the upper surface of lower clamp body is provided with sensor adjustment groove, and displacement transducer can be along the sensor
Regulating tank is moved and realized in the sensor adjustment groove optional position and positioned.Sensor is moved along sensor adjustment groove, according to
The bone plate sample of different size, it is possible to achieve the adjustment of sensing station, increases the versatility of fixture.
For ease of using, the lower edge of upper fixture outside is provided with scale, for as adjustment inner side roll shaft away from
From scale；The upper edge of lower clamp outside is provided with scale, the scale for the distance as adjustment outside roll shaft.On
Clamp body and lower clamp body are equipped with scale, and formation refers to scale, the position adjustment for all parts being easy to above it, preferably
, the datum mark of upper fixture body and lower clamp body high scale is centrally located, and scale value is symmetrical arranged from datum mark to both sides, interior
Side roller axle and outside roll shaft are also arranged symmetrically from datum mark to both sides, easy to operate；The width of the width of upper fixture body, upper adjustable plate
Degree is equal sized with the length of inner side roll shaft, the length of the width of lower clamp body, the width of lower adjustable plate and outside roll shaft
Size is also equal, and such upper fixture body is concordant with the side of upper adjustable plate, and lower clamp body and the side of lower adjustable plate are also concordant, adjusts
Adjustable plate and reference mark can more facilitate during lower adjustable plate on section, the assurance to position can be more accurate.
The beneficial effects of the utility model are：
1st, fixture of the present utility model, is provided with the upper fixture body and lower clamp body used cooperatively, and upper fixture body is provided with
Inner side roll shaft, lower clamp body is provided with outside roll shaft, and installation three is used for the displacements for detecting test specimen amount of deflection on lower clamp body
Sensor, three displacement transducers detect respectively sample and two inner side roll shaft contact positions and with two inner sides roll shaft contact position it
Between central spot amount of deflection, the data required for two kinds of assay methods just can be so determined by same sample, without point
Do not measure twice, that is, improve efficiency, turn avoid the error that sample individual difference is brought, while saving sample, reduce
Cost.
2nd, the fixture of the utility model example, the position of inner side roll shaft, outside roll shaft and displacement transducer can be adjusted,
It can adjust its position to meet test requirements document, highly versatile according to different sample models.
3rd, the fixture of the utility model example, provided with for for the spacing limiting plate of sample, it is ensured that the axis of sample with
The axis perpendicular of inner side roll shaft and outside roll shaft, improves the degree of accuracy of measurement result.
4th, the fixture of the utility model example, inner side roll shaft is split-type structural with upper adjustable plate, and outside roll shaft is with lowering
It is also split-type structural to save plate, and one piece of upper adjustable plate/lower adjustable plate can be engaged with multiple inner side roll shaft/outside roll shafts, roller
For axle can have a different Multiple Type of diameter, and roll shaft is compared with other parts, more easily loss, being set to can be independent
The split-type structural of roll shaft is changed, versatility is not only increased, is more convenient for operating, and reduction replacement cost.
5th, the fixture of the utility model example, upper fixture body and lower clamp body are equipped with scale, and formation refers to scale, is easy to
The position adjustment of all parts above it, accuracy that is easy to operate and adding position adjustments.
6th, the fixture of the utility model example, upper adjustable plate and lower adjustable plate include lateral part and longitudinal component, roller
Axle position, will not phase between upper adjustable plate, lower adjustable plate and sample when tested sample deforms in the end of longitudinal component
Hu Gan Wataru, are smoothed out experiment, and the measurement result degree of accuracy is high.
Brief description of the drawings
Fig. 1 is the structural representation of the upper fixture of the utility model embodiment one；
Fig. 2 is Fig. 1 left view；
Fig. 3 is Fig. 1 upward view；
Fig. 4 is the structural representation of the lower clamp of the utility model embodiment one；
Fig. 5 is Fig. 4 left view；
Fig. 6 is Fig. 4 top view；
Fig. 7 is that the structural representation that the China and foreign countries' side roller axle of the utility model embodiment one and lower adjustable plate are engaged (omits roller
Axle stopping means)；
Fig. 8 is that the structural representation that the China and foreign countries' side roller axle of the utility model embodiment two and lower adjustable plate are engaged (omits roller
Axle stopping means)；
Fig. 9 is that the structural representation that the China and foreign countries' side roller axle of the utility model embodiment three and lower adjustable plate are engaged (omits roller
Axle stopping means)；
Figure 10 is the structural representation of bone plate；
The schematic diagram that Figure 11 coordinates for the fixture of the utility model example with bone plate；
Figure 12 is the load-deflection curve schematic diagram in the assay method of the utility model embodiment.
In figure：1 upper fixture body, mounting flange on 2, adjustable plate on 3,4 limit springs, regulating bolt on 5,6 inner side roll shafts,
Mounting blocks on 7,8 upper hopper chutes, 9 times mounting posts, 10 times adjustable plates, 11 times regulating bolts, 12 limiting plates, 13 outside roll shafts, 14 rollers
Axle stopping means, 151 left side displacement transducers, 152 middle displacement transducers, 153 right side displacement transducers, 16 lower clamp bodies,
17 times mounting blocks, 18 limiting plate regulating tanks, 19 gliding grooves, 20 sensor adjustment grooves, 21 bones plate, 22 through holes.
Embodiment
With reference to specific embodiment, the utility model will be further described：
Embodiment one：
It is a kind of to be used for the fixture of bone plate bending strength and stiffness measuring, including the upper fixture being used in conjunction with each other and lower folder
Tool.
As shown in FIG. 1 to 3, upper fixture includes being provided with two inner sides on upper fixture body 1, the lower surface of upper fixture body 1
Roll shaft 6, inner side roll shaft 6 is arranged on upper fixture body 1 by upper adjustable plate 3, and the lower surface of upper fixture body 1 is provided with upper hopper chute 8,
Upper adjustable plate 3 can drive inner side roll shaft 6 to be slided along upper hopper chute 8 and realize positioning in the optional position of upper hopper chute 8.
Upper hopper chute 8 is that matched upper mounting blocks 7 are provided with T-slot, upper hopper chute 8, and upper mounting blocks 7 can be along upper hopper chute
Slide；Upper mounting blocks 7 are located at part wider at the top of T-slot, as shown in Fig. 2 upper mounting blocks 7 may be alternatively provided as T-shaped, Huo Zheshe
The step being set in the rectangle adaptable with part wider at the top of T-slot, T-slot can form spacing to upper mounting blocks 7, keep away
Exempt from it to come off.Such as Fig. 1, upper adjustable plate 3 includes lateral part and longitudinal component, forms L-shaped structure, and lateral part is used for upper
It is engaged with upper fixture body 1, longitudinal component is under, and its bottom is used for and inner side roll shaft 6 is engaged, two upper adjustable plates 3 are symmetrical
Arrangement, the lateral part of upper adjustable plate 3 is arranged in upper hopper chute 8 by upper regulating bolt 5, can after upper regulating bolt 5 is loosened
To realize the movement of upper adjustable plate 3, so that the regulation of the inner side position of roll shaft 6 is realized, after correct position is adjusted to, by upper regulation
Bolt 5 is tightened, the positioning of adjustable plate 3 in realization, so as to realize the positioning of inner side roll shaft 6.
Upper adjustable plate 3 can drive inner side roll shaft 6 to move, so as between convenient two inner side roll shafts 6 of regulation
Distance, can adjust according to the bone plate of different size, expand the versatility of fixture.For ease of the upper position of adjustable plate 3
It is determined that, the lower edge of the lateral surface of upper fixture body 1 is provided with scale, the scale for the distance as adjustment inner side roll shaft 6；Upper folder
The datum mark of specific 1 high scale is centrally located, and scale value is symmetrical arranged from datum mark to both sides, and inner side roll shaft 6 is also from benchmark
Point is arranged symmetrically to both sides, easy to operate；The length of the width of upper fixture body 1, the width of upper adjustable plate 3 and inner side roll shaft 6
Equal sized, such upper fixture body 1 is concordant with the side of upper adjustable plate 3, and reference mark can be more square during adjustable plate 3 in regulation
Just, the assurance to position can be more accurate.
Upper adjustable plate 3 and inner side roll shaft 6 are split-type structural, the two ends of inner side roll shaft 6 respectively by limit spring 4 with it is upper
Adjustable plate 3 is connected.The structure type of upper adjustable plate 3 and inner side roll shaft 6 refers to lower adjustable plate 10 and outside roll shaft 13 in Fig. 7
Structure, both structures are identical, and simply position is opposite.Limit spring 4 as depicted in figs. 1 and 2, at the two ends of inner roller axle 6 and
The relevant position of upper adjustable plate 3 sets screw respectively, and the two ends of limit spring 4 are hung on corresponding screw.On
Adjustable plate 3 and inner side roll shaft 6 are split-type structural, and same upper adjustable plate 3 can coordinate the roll shaft of different-diameter, be convenient for changing
The operation that roll shaft makes, also reduces the cost of fixture, improves the versatility of fixture.Limit spring 4 is set to limit inner side roll shaft 6
It is scheduled on adjustable plate 3, it is to avoid inner side roll shaft 6 comes off, meanwhile, limit spring 4 is arranged on two ends, do not interfere with inner roller
The working face of axle 6.
As shown in Fig. 4~Fig. 6, lower clamp includes being provided with lower clamp body 16, the upper surface of lower clamp body 16 outside two
Three displacement transducers are set side by side between side roller axle 13, two outside roll shafts 13, the displacement transducer positioned at both sides is distinguished
It is corresponding with two inner side roll shafts 6.Three displacement transducers are respectively left side displacement transducer 151, middle displacement sensing
Device 152 and right side displacement transducer 153, middle displacement transducer 152 are located at the center between two outside roll shafts 13, left side
Displacement transducer 151 and right side displacement transducer 153 are symmetrically distributed in the both sides of the middle displacement transducer 152.
Outside roll shaft 13 is arranged on the lower clamp body 16 by lower adjustable plate 10, is set on the upper surface of lower clamp body 16
There is gliding groove 19, lower adjustable plate 10 can drive outside roll shaft 13 to slide and realized in the optional position of gliding groove 19 along gliding groove 19
Positioning.Matched lower mounting blocks 17 are provided with gliding groove 19, lower mounting blocks 17 can be slided along gliding groove 19；Lower adjustable plate
10 be L shaped plate, and two lower adjustable plates 10 are symmetrically arranged, and the lateral part of lower adjustable plate 10 is installed by lower regulating bolt 11
On lower mounting blocks 17, the top of the longitudinal component of lower adjustable plate 10 is provided with outside roll shaft 13.By lower regulating bolt 11 come
Lower adjustable plate 10 is installed, after lower regulating bolt 11 is loosened, it is possible to achieve the movement of lower adjustable plate 10, so as to realize outside roll shaft
The regulation of 13 positions, after correct position is adjusted to, lower regulating bolt 11 is tightened, and realizes the positioning of lower adjustable plate 10, so that
The positioning of outside roll shaft 13 is realized, bolt mounting means is easy to operate, and cost is low.
The upper surface of lower clamp body 16 is provided with sensor adjustment groove 20, and displacement transducer can be along the sensor adjustment groove
20 movements simultaneously realize positioning in the optional position of sensor adjustment groove 20.Displacement transducer can directly be pacified by bolt respectively
It is arranged in sensor adjustment groove 20, or by bolt on the mounting blocks in sensor adjustment groove 20, mounting blocks can edge
Sensor adjustment groove 20 is moved.Because gliding groove 19 and sensor adjustment groove 20 is top end opening, under gravity,
Each part can be located in gliding groove 19 or sensor adjustment groove 20 naturally, will not fall off, therefore, and gliding groove 19 and sensor are adjusted
The cross sectional shape of section groove 20 is not limited, from the point of view of processing technology, in the present embodiment, and gliding groove 19 and sensor are adjusted
The cross sectional shape of section groove 20 is set to rectangle.
Lower adjustable plate 10 can drive outside roll shaft 13 to move, so as between convenient two outside roll shafts 13 of regulation
Distance, can be adjusted according to the bone plate of different size, expand the versatility of fixture.Sensor is along sensor adjustment groove
20 movements, according to the bone plate sample of different size, it is possible to achieve the adjustment of sensing station, increase the versatility of fixture.
As shown in fig. 6, in the present embodiment, sensor adjustment groove 20 is arranged on the major axis line position of lower clamp body 16, glide
Groove 19 is provided with twice, is symmetrically distributed in the both sides of sensor adjustment groove 20, and the arrangement is easy to processing, is easy to lower adjustable plate
It will not be influenced each other between 10 and the installation of displacement transducer, and lower adjustable plate 10 and displacement transducer.
As shown in fig. 7, lower adjustable plate 10 and the outside roll shaft 13 are split-type structural, lower adjustable plate 10 and the outside
One end or two ends at the cooperation of roll shaft 13 are provided with roll shaft stopping means 14 (not shown in Fig. 7).The knot of roll shaft stopping means 14
Structure refers to Fig. 4~Fig. 6, using the knot for the drawing pin head shapes that can block the end of outside roll shaft 13 on lower adjustable plate 10
Structure, in addition, roll shaft stopping means 14 can also can be kept off in outer side roller using laminated structure, platy structure or block structure etc.
The end of axle 13 is to avoid it from being moved in axis direction, the placement that can be consolidated under gravity due to outside roll shaft
On lower adjustable plate, so attachment structure need not be set between lower adjustable plate and outside roll shaft.
In the present embodiment, inner side roll shaft 6 and outside roll shaft 13 are cylindrical-shaped structure.
The upper edge of the lateral surface of lower clamp body 16 is provided with scale, the mark for the distance as adjustment outside roll shaft 13
Chi.The datum mark of the high scale of lower clamp body 16 is centrally located, and scale value is symmetrical arranged from datum mark to both sides, outside roll shaft 13
Also it is arranged symmetrically from datum mark to both sides, it is easy to operate；The width of lower clamp body 16, the width of lower adjustable plate 10 and outside roll shaft
13 length it is equal sized, such lower clamp body 16 and the side of lower adjustable plate 10 are also concordant, join during the lower adjustable plate 10 of regulation
Examining scale can more facilitate, and the assurance to position can be more accurate.
The outside of lower adjustable plate 10 is provided with least two limiting plates 12, and the top of limiting plate 12 is protruded in outer side roller axle 13
Top, the bottom of limiting plate 12 is arranged in the limiting plate regulating tank 18 on lower adjustable plate 10 by screw, limiting plate regulating tank
18 be level trough.Unscrew after screw, limiting plate 12 can be moved along limiting plate regulating tank 18, be moved to after correct position, tightened spiral shell
Nail, realizes the positioning of limiting plate 12, provided with limiting plate 12, when in use tested bone plate sample be located at two limiting plates 12 it
Between, two limiting plates 12 clamp sample, it is ensured that the axis of the axis of sample and inner side roll shaft 6 and outside roll shaft 13 mutually hangs down
Directly, it is to avoid sample is shifted over.
For ease of understanding of the present utility model, the utility model is further retouched with reference to its assay method
State：
During measure, Material Testing Machine can be used to provide test force, upper fixture is arranged on to the upper installation of Material Testing Machine
On flange 2, in the lower mounting post 9 that lower clamp is arranged on to Material Testing Machine, carried out with using the cylindric roll shaft of the present embodiment
During measure, bias of the bone plate 21 away from central plane of wherein cross sectional curve must not exceed b/6, and b is the width of bone plate 21
Degree.
Operating process comprises the following steps：
Step (1)：As shown in Figure 10 and Figure 11, tested bone plate 21 is arranged between upper fixture and lower clamp, inner side
The upper surface of roll shaft 6 and bone plate 21, outside roll shaft 13 and displacement transducer are contacted with the lower surface of bone plate 21, inner side
Roll shaft 6 is located at the inner side of outside roll shaft 13；
If bone plate 21 is symmetrical, then symmetrically two through holes 22 near symmetrical centre are placed in two
Between side roller axle 6；
If bone plate 21 has a central through hole, then symmetrically central through hole and other close through hole 22 are put
Between two inner side roll shafts 6；
If bone plate is asymmetric, then be placed between two inner side roll shafts 6 two through holes 22, make to be intended to produce
The position of fracture is between two inner side roll shafts 6；
It (is position m) apart from the unit for h, distance that two outside roll shafts 13, which should be placed on equidistant with inner side roll shaft 6,
On, make only one of which through hole 22 between inner side roll shaft 6 and outside roll shaft 13 in the longitudinal direction；
During installation, it should be ensured that the part that two inner side roll shafts 6 do not have through hole 22 with bone plate 21 is in contact, as possible,
The part that two outside roll shafts 13 also should not have through hole 22 with bone plate 21 is in contact；Measurement two inner side roll shafts 6 between away from
From for k (unit is m).
Step (2)：The axis of the bone plate 21 is calibrated, makes the axis and inner side roll shaft 6 and outside roll shaft of bone plate 21
13 axis is vertical；
Step (3)：As shown in figure 12, the position of displacement transducer 152 applies downward test force F in the middle of correspondence, by
Cumulative plus F value, draws one using load as ordinate, and amount of deflection δ is the load-deflection curve of abscissa, until obtaining or
F value F=Fmax when bone plate is broken, or F values F=P when occurring obvious yield point on bone plate sag curve；
The measurement data of middle displacement transducer 152 is δ 1, and the measurement data of left side displacement transducer 151 is δ 2, right side
The measurement data of displacement transducer 153 is δ 3；
Step (4)：The average amount of deflection δ 4 of the bone plate is calculated according to formula one：
Formula one：δ4=0.5 (δ2+δ3)
The equivalent bending stiffness E of the bone plate is calculated according to formula two or formula three：
Formula two：
Formula three：
In the formula two and formula three：
The horizontal range of h-between inner side roll shaft and outside roll shaft, unit is rice (m)；
Horizontal range between k-inner side roll shaft, unit is rice (m)；
The slope of S-load-deflection curve, unit is Newton/meter (N/m)；
On load-deflection curve, a straight line parallel to curve linear part is drawn, the straight line is transfer line, transfer
The transfer of line opposing curves linear segment is q, and the intersection point of transfer line and load-deflection curve is yield point and this point pair
The load answered is defined as yield load P, and transfer q is calculated by formula four：
Formula four：Q=0.02 (2h+k)；
Bending strength is calculated by formula five:
Formula five：Bending strength=0.5Ph；
If bone plate is not broken before load-deflection curve intersects with transfer line, bending is calculated by formula six
Intensity:
Formula six：Bending strength=0.4Fmax × h.
Embodiment two：
The present embodiment is repeated no more with the identical feature of embodiment one, and the present embodiment feature different from embodiment one exists
In：It is equal diameter cylinder with the faces of sample contacts as shown in figure 8, outside roll shaft 13 is column, the shape of inner side roll shaft 6 can be with
Outside roll shaft is identical.
Embodiment three：
The present embodiment is repeated no more with the identical feature of embodiment one, and the present embodiment feature different from embodiment one exists
In：As shown in figure 9, outside roll shaft 13 is equal diameter semi-cylindrical, the face with sample contacts is arcwall face, the shape of inner side roll shaft 6
Shape can be identical with outside roll shaft.
The shape of inner side roll shaft 6 and outside roll shaft 13 of the present utility model is not limited to the shape described in embodiment, can also set
For other shapes, from the aspect of processing technology, cylindric is preferred embodiment, as long as but making itself and sample
Contact surface is the equal diameter face of cylinder, and arc diameter preferred 8mm, 10mm, the 12mm on the equal diameter face of cylinder can also be
Other values between 8mm~13mm.
Preferred embodiment of the present utility model is the foregoing is only, is not whole embodiments of the present utility model,
Not to limit the utility model, all any modifications within spirit of the present utility model and principle, made, equivalent substitution,
Improve etc., it should be included within protection domain of the present utility model.
In addition to technical characteristic described in specification, remaining technical characteristic is technology known to those skilled in the art.
Claims (9)
1. the fixture determined for bone plate bending strength and equivalent bending stiffness, it is characterized in that, including be used in conjunction with each other
Upper fixture and lower clamp,
The upper fixture includes upper fixture body, and the lower surface of the upper fixture body is provided with two downwardly projecting inner side roll shafts,
The lower surface of the inner side roll shaft is equal diameter cylinder；
The lower clamp includes lower clamp body, and the upper surface of the lower clamp body is provided with two outside roll shafts protruding upward,
The upper surface of the outside roll shaft is equal diameter cylinder；
Three displacement transducers are set side by side between two outside roll shafts, institute's displacement sensors difference positioned at both sides
It is corresponding with two inner side roll shafts.
2. the fixture according to claim 1 determined for bone plate bending strength and equivalent bending stiffness, it is characterized in that,
The inner side roll shaft is arranged on the upper fixture body by upper adjustable plate, and the lower surface of the upper fixture body is provided with upper cunning
Groove, the upper adjustable plate can drive inner side roll shaft to be slided along the upper hopper chute and fixed in the optional position realization of the upper hopper chute
Position.
3. the fixture according to claim 2 determined for bone plate bending strength and equivalent bending stiffness, it is characterized in that,
The upper hopper chute is that matched upper mounting blocks are provided with T-slot, the upper hopper chute, and the upper mounting blocks can be along upper hopper chute
Slide；The upper adjustable plate is arranged on the upper mounting blocks by upper regulating bolt.
4. the fixture according to claim 2 determined for bone plate bending strength and equivalent bending stiffness, it is characterized in that,
The upper adjustable plate and the inner side roll shaft are split-type structural, the two ends of the inner side roll shaft respectively by spring with it is described on
Adjustable plate is connected.
5. the fixture according to claim 1 determined for bone plate bending strength and equivalent bending stiffness, it is characterized in that,
The outside roll shaft is arranged on the lower clamp body by lower adjustable plate, and the upper surface of the lower clamp body is provided with downslide
Groove, the lower adjustable plate can drive outside roll shaft to be slided along the gliding groove and fixed in the optional position realization of the gliding groove
Position.
6. the fixture according to claim 5 determined for bone plate bending strength and equivalent bending stiffness, it is characterized in that,
Matched lower mounting blocks are provided with the gliding groove, the lower mounting blocks can be slided along gliding groove；The lower adjustable plate
For L shaped plate, the lateral part of lower adjustable plate is arranged on the lower mounting blocks by lower regulating bolt, longitudinal portion of lower adjustable plate
The top divided is provided with the outside roll shaft.
7. the fixture according to claim 5 determined for bone plate bending strength and equivalent bending stiffness, it is characterized in that,
The lower adjustable plate and the outside roll shaft are split-type structural, the lower adjustable plate and one end at the outside roll shaft cooperation
Or two ends are provided with roll shaft stopping means.
8. the fixture according to claim 5 determined for bone plate bending strength and equivalent bending stiffness, it is characterized in that,
The outside of the lower adjustable plate is provided with least two limiting plates, and the top of the limiting plate is protruded in the upper of the outside roll shaft
Side, the bottom of the limiting plate is arranged in the limiting plate regulating tank on lower adjustable plate by screw, the limiting plate regulating tank
For level trough.
9. the fixture according to claim 1 determined for bone plate bending strength and equivalent bending stiffness, it is characterized in that,
The upper surface of the lower clamp body is provided with sensor adjustment groove, and institute's displacement sensors can be moved along the sensor adjustment groove
And realize positioning in the sensor adjustment groove optional position.
Priority Applications (1)
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| CN201720130387.1U CN206573384U (en) | 2017-02-14 | 2017-02-14 | The fixture determined for bone plate bending strength and equivalent bending stiffness |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106885728A (en) * | 2017-02-14 | 2017-06-23 | 山东省医疗器械产品质量检验中心 | The fixture and method determined for bone plate bending strength and equivalent bending stiffness |
| CN116399716A (en) * | 2023-06-09 | 2023-07-07 | 江苏嘉斯康医疗科技有限公司 | Press for bone fracture plate test |
-
2017
- 2017-02-14 CN CN201720130387.1U patent/CN206573384U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106885728A (en) * | 2017-02-14 | 2017-06-23 | 山东省医疗器械产品质量检验中心 | The fixture and method determined for bone plate bending strength and equivalent bending stiffness |
| CN116399716A (en) * | 2023-06-09 | 2023-07-07 | 江苏嘉斯康医疗科技有限公司 | Press for bone fracture plate test |
| CN116399716B (en) * | 2023-06-09 | 2023-08-22 | 江苏嘉斯康医疗科技有限公司 | Press for bone fracture plate test |
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