CN108645790A - Screw axial withdrawal force experiment loading unit - Google Patents

Screw axial withdrawal force experiment loading unit Download PDF

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Publication number
CN108645790A
CN108645790A CN201810790754.XA CN201810790754A CN108645790A CN 108645790 A CN108645790 A CN 108645790A CN 201810790754 A CN201810790754 A CN 201810790754A CN 108645790 A CN108645790 A CN 108645790A
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CN
China
Prior art keywords
connecting rod
shaped structure
screw
link block
top connecting
Prior art date
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Granted
Application number
CN201810790754.XA
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Chinese (zh)
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CN108645790B (en
Inventor
李文娇
董双鹏
张述
赵丙辉
王涛
张晨
付瑞芝
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Tianjin Medicine Equipment Quality Supervision And Inspection Center
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Tianjin Medicine Equipment Quality Supervision And Inspection Center
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N19/00Investigating materials by mechanical methods
    • G01N19/04Measuring adhesive force between materials, e.g. of sealing tape, of coating

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention discloses screw pull-out strength experiment loading units, including middle part link block, middle part link block is square frame-shaped structure, among the top plate of middle part link block and among bottom plate and along top connecting hole and lower part connecting hole is had perpendicular to the direction of top plate and bottom plate, lower part and the top connecting hole of top connecting rod are fixedly linked;The disk-shaped structure of flexible connection block is supported on the plate top surface of middle part link block, the rounding frustum for being flexibly connected block passes through lower part connecting hole, it is flexibly connected block to hang on the bottom plate of middle part link block by disk-shaped structure, be fixed in the mounting hole of rounding frustum at the top of a root bottom part connecting rod.The present apparatus ensures that load is transmitted by screw head and direction and the longitudinal direction of screw are axial conllinear.

Description

Screw axial withdrawal force experiment loading unit
Technical field
The present invention relates to screw axial withdrawal force experiment loading units.
Background technology
Fracture is one of most common illness of orthopaedic disease.Metal bone screw is that surgeon's progress bone fixation operation carries A kind of means have been supplied, have been one of most common means of current treatment fracture.After in screw placement human body, carried in addition to bearing work Can lotus be firmly fixed at knochenbruch be one of important performance that screw is cured.U.S. material association file publishing ASTM F543 defines medical metal bone screw standard criterion and test method, and wherein appendix A 3 axially extracts medical bone screw Power test method provided, China has also formulated professional standard YY/T 1504-2016, and specification medical bone screw pulls out The test method of output.Screw pull-out strength experimental rig schematic diagram is provided in standard, sees Fig. 1.Structural screws shown in FIG. 1 are pulled out Service test device, in order to make load along screw head transmit and it is conllinear with the longitudinal axis of screw, device should have aid spiral shell Nail head and the slot not contacted with screw rod.1 in Fig. 1 be load axis, 2 be loading device, 3 be drill bushing, 4 be fastening span, 5 It is test block for screw-in depth, 6,7 is test block clamp and base station.
It generally directly clamps ailhead in industry using collet at present and carries out pull, but be easy to press from both sides ailhead so bad And screw pull-out strength can not be measured, effect is very undesirable.
Invention content
It is an object of the invention to overcome the deficiencies in the prior art, and providing one kind can be such that load is transmitted by screw head And direction and the longitudinal direction of screw are axial conllinear, meet and apply tensile load to screw, and is replaceable with different size slots Connecting rod, realize to different size medical metal bone screw pullout of strength experiment loading units.
The screw pull-out strength experiment loading unit of the present invention, including a top connecting rod and middle part link block, it is described Middle part link block is square frame-shaped structure, among the top plate of the middle part link block and among bottom plate and along perpendicular to top plate Top connecting hole and lower part connecting hole are had with the direction of bottom plate, axis edge is provided on the top of the top connecting rod Horizontally arranged horizontal connection through-hole, the horizontal connection through-hole are used for by fixing piece joint test machine, described Top connecting rod the hypomere body of rod on be provided with external screw thread, on the external screw thread be equipped with retaining ring, top connecting rod and When testing machine connects, retaining ring is used to fix the two and lock, and lower part and the top connecting hole of the top connecting rod are fixed It is connected;
One flexible connection block includes the disk-shaped structure that diameter is more than lower part connecting hole, in the top surface of the disk-shaped structure Centre is fixed with montant, is downwardly projected among the bottom surface of the disk-shaped structure and is provided with rounding frustum, in the rounding The centre of frustum is provided with mounting hole, is fixed in mounting hole at the top of a root bottom part connecting rod, on the bottom connector rails It is provided with the straight slot of the perforation body of rod, is provided with the card for catching on ailhead in the horizontal direction in the horizontal bottom wall of the straight slot Slot, the card slot are used to catch on the ailhead of screw to be pulled out in bone block, and the straight slot is used to accommodate the nail of screw to be pulled out Bar;
The disk-shaped structure of the flexible connection block is supported on the plate top surface of middle part link block, is flexibly connected falling for block The frustum of a cone passes through lower part connecting hole, the flexible connection block to be hung on the bottom plate of middle part link block by disk-shaped structure, institute The axis collinear of the top connecting rod and bottom connector rails stated.
Advantages of the present invention:
1, whole device ensures that load is transmitted by screw head and direction and the longitudinal direction of screw are axial conllinear.
2, the design of flexible connection block when ensure that installation bottom connector rails it can be made smoothly to hook up and down and left and right activity Firmly ailhead.
3, the connecting rod with different size slots can be connected by being flexibly connected below block, to complete to add different-diameter screw It carries.
4, the design of slot ensure that the load to head and not contacted with nail rod, avoid the power for generating other directions.
Description of the drawings
Fig. 1 is existing screw pull-out strength experimental rig schematic diagram;
Fig. 2 is the stereogram of the screw pull-out strength experiment loading unit of the present invention;
Fig. 3 is the stereogram for the screw pull-out strength experiment loading unit for looking up direction;
Fig. 4 is the stereogram of the top connecting rod in device shown in Fig. 3;
Fig. 5 is the stereogram of the retaining ring in device shown in Fig. 3;
Fig. 6 is the stereogram of the middle part link block in device shown in Fig. 3;
Fig. 7 is the stereogram of the flexible connection block in device shown in Fig. 3;
Fig. 8 is the stereogram of the bottom connector rails in device shown in Fig. 3.
Specific implementation mode
The present invention is described in detail in the following with reference to the drawings and specific embodiments.
The screw pull-out strength experiment loading unit of the present invention as illustrated in figs. 2 through 8, including a top connecting rod 1 and middle part Link block 3, the middle part link block are square frame-shaped structure, among the top plate of the middle part link block and among bottom plate simultaneously And along top connecting hole and lower part connecting hole is had perpendicular to the direction of top plate and bottom plate, in the top connecting rod 1 Top be provided with the horizontally disposed horizontal connection through-hole of axis, the horizontal connection through-hole is used for through fixing piece company Testing machine is connect, external screw thread is provided on the hypomere body of rod of the top connecting rod 1, equipped with locking on the external screw thread Ring 2, when top connecting rod 1 is connected with testing machine, retaining ring is used to fix the two and lock, under the top connecting rod 1 Portion is fixedly linked with top connecting hole, and the preferred top connecting rod 1 is connected with top connecting hole by being interference fitted.Examination It tests machine and uses existing equipment.
One flexible connection block 4 includes the disk-shaped structure that diameter is more than lower part connecting hole, on the top of the disk-shaped structure It is fixed with montant among face, is downwardly projected among the bottom surface of the disk-shaped structure and is provided with rounding frustum, is fallen in described The centre of the frustum of a cone is provided with mounting hole, and the top of a root bottom part connecting rod 5 is fixed in mounting hole.In the bottom connector rails It is provided with the straight slot 6 of the perforation body of rod on 5, is provided in the horizontal direction in the horizontal bottom wall of the straight slot for catching on ailhead Card slot 7, the card slot are used to catch on the ailhead of screw to be pulled out in bone block, and the straight slot 6 is for accommodating screw to be pulled out Nail rod.
The straight slot of this structure middle and lower part connecting rod reserves enough spaces to ailhead, and the design of slot ensure that screw Loading and not contacted with the nail rod of screw to be pulled out for head, avoids the power for generating other directions.
The disk-shaped structure of the flexible connection block 4 is supported on the plate top surface of middle part link block, flexible connection block 4 Rounding frustum passes through lower part connecting hole, the flexible connection block 4 to be hung on the bottom plate of middle part link block by disk-shaped structure, Bottom connects when the design of the axis collinear of the top connecting rod 1 and bottom connector rails 5, flexible connection block 4 ensure that installation Extension bar can be upper and lower and controls activity, so that it is smoothly caught on ailhead, facilitates axial alignment.
Each component is all made of steel manufacture in the present apparatus, and the straight slot of bottom connector rails may be designed to different sizes, activity Connecting rod of the link block connection with different size slots, to complete the load to different-diameter screw.
The application method of the present apparatus is:
The top connecting rod of the present apparatus is connected with testing machine and (can make connecting rod according to the connection size of testing machine), is used Pin is fixed, and the test block for screwing in screw is loaded in below testing machine, and the measurement of nigration machine makes device reach suitable position, So that ailhead is vertically arranged in straight slot 6, be stuck in card slot 7, withdrawal force then is applied to screw in the way of Fig. 1.

Claims (2)

1. screw pull-out strength experiment loading unit, it is characterised in that:It is described including a top connecting rod and middle part link block Middle part link block is square frame-shaped structure, among the top plate of the middle part link block and among bottom plate and along perpendicular to top plate Top connecting hole and lower part connecting hole are had with the direction of bottom plate, axis edge is provided on the top of the top connecting rod Horizontally arranged horizontal connection through-hole, the horizontal connection through-hole are used for by fixing piece joint test machine, described Top connecting rod the hypomere body of rod on be provided with external screw thread, on the external screw thread be equipped with retaining ring, top connecting rod and When testing machine connects, retaining ring is used to fix the two and lock, and lower part and the top connecting hole of the top connecting rod are fixed It is connected;
One flexible connection block includes the disk-shaped structure that diameter is more than lower part connecting hole, among the top surface of the disk-shaped structure It is fixed with montant, is downwardly projected among the bottom surface of the disk-shaped structure and is provided with rounding frustum, in the rounding frustum Centre be provided with mounting hole, be fixed in mounting hole at the top of a root bottom part connecting rod, be provided on the bottom connector rails The straight slot for penetrating through the body of rod, is provided with the card slot for catching on ailhead, institute in the horizontal direction in the horizontal bottom wall of the straight slot The card slot stated is used to catch on the ailhead of screw to be pulled out in bone block, and the straight slot is used to accommodate the nail rod of screw to be pulled out;
The disk-shaped structure of the flexible connection block is supported on the plate top surface of middle part link block, is flexibly connected the inverted cone of block Platform passes through lower part connecting hole, and the flexible connection block is hung by disk-shaped structure on the bottom plate of middle part link block, described The axis collinear of top connecting rod and bottom connector rails.
2. screw pull-out strength experiment loading unit according to claim 1, it is characterised in that:The top connecting rod with Top connecting hole is connected by being interference fitted.
CN201810790754.XA 2018-07-18 2018-07-18 Loading device for axial extraction force test of screw Active CN108645790B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810790754.XA CN108645790B (en) 2018-07-18 2018-07-18 Loading device for axial extraction force test of screw

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810790754.XA CN108645790B (en) 2018-07-18 2018-07-18 Loading device for axial extraction force test of screw

Publications (2)

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CN108645790A true CN108645790A (en) 2018-10-12
CN108645790B CN108645790B (en) 2024-02-27

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CN201810790754.XA Active CN108645790B (en) 2018-07-18 2018-07-18 Loading device for axial extraction force test of screw

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10267922A (en) * 1997-03-27 1998-10-09 Inax Corp Diagnozing method of timber
JPH1172424A (en) * 1997-07-01 1999-03-16 Ricoh Co Ltd Drawing strength tester and its test method
KR20070067567A (en) * 2005-12-24 2007-06-28 한국철도기술연구원 Jig for holding a screw spike in drawing test
CN201788122U (en) * 2010-09-15 2011-04-06 济南试金集团有限公司 Tension test device of bolts and screws with minor diameters
CN202372404U (en) * 2011-12-30 2012-08-08 东方蓝天钛金科技有限公司 Bolt and screw tension test fixture
CN103091161A (en) * 2013-01-08 2013-05-08 常州华厦建设工程质量检测有限公司 Tensile strength test clamp of automatic positioning screw
CN203455223U (en) * 2013-07-17 2014-02-26 中建钢构有限公司 Pulling-out force testing clamp for ring groove rivet
CN208537375U (en) * 2018-07-18 2019-02-22 天津市医疗器械质量监督检验中心 Screw axial withdrawal force experiment loading unit

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10267922A (en) * 1997-03-27 1998-10-09 Inax Corp Diagnozing method of timber
JPH1172424A (en) * 1997-07-01 1999-03-16 Ricoh Co Ltd Drawing strength tester and its test method
KR20070067567A (en) * 2005-12-24 2007-06-28 한국철도기술연구원 Jig for holding a screw spike in drawing test
CN201788122U (en) * 2010-09-15 2011-04-06 济南试金集团有限公司 Tension test device of bolts and screws with minor diameters
CN202372404U (en) * 2011-12-30 2012-08-08 东方蓝天钛金科技有限公司 Bolt and screw tension test fixture
CN103091161A (en) * 2013-01-08 2013-05-08 常州华厦建设工程质量检测有限公司 Tensile strength test clamp of automatic positioning screw
CN203455223U (en) * 2013-07-17 2014-02-26 中建钢构有限公司 Pulling-out force testing clamp for ring groove rivet
CN208537375U (en) * 2018-07-18 2019-02-22 天津市医疗器械质量监督检验中心 Screw axial withdrawal force experiment loading unit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
张克玉;华子恺;: "接骨螺钉的失效分析与强度测试", 医用生物力学, no. 03 *

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