CN113720541A - Self-tapping performance double-position testing machine for pressing and pulling force, rotating torque and self-tapping performance of medical bone screw - Google Patents
Self-tapping performance double-position testing machine for pressing and pulling force, rotating torque and self-tapping performance of medical bone screw Download PDFInfo
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- CN113720541A CN113720541A CN202110940935.8A CN202110940935A CN113720541A CN 113720541 A CN113720541 A CN 113720541A CN 202110940935 A CN202110940935 A CN 202110940935A CN 113720541 A CN113720541 A CN 113720541A
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- 210000000988 bone and bone Anatomy 0.000 title claims abstract description 89
- 238000012360 testing method Methods 0.000 title claims abstract description 66
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 29
- 239000003638 chemical reducing agent Substances 0.000 claims description 16
- 238000005452 bending Methods 0.000 claims description 13
- 238000009987 spinning Methods 0.000 claims description 6
- 208000010392 Bone Fractures Diseases 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000001054 cortical effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/06—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool
- G01M3/08—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool for pipes, cables or tubes; for pipe joints or seals; for valves; for welds
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Abstract
The invention provides a double-position testing machine for the pressure-pull force, the rotation torque and the self-tapping performance of a medical bone screw, which can test the screwing-in-out torque and the self-tapping performance borne by the medical bone screw in clinical use, and can test the comprehensive mechanics such as the pulling-out force borne by the medical bone screw after being screwed in, the pressure during screwing in and the like. The device comprises a rack, an axial loading system, a rotary loading system and a clamping device; the clamping device comprises a medical bone screw clamping device and a test block clamping device; the axial loading system is used for driving the movable seat to move back and forth along the horizontal direction of the rack, and the movable seat is connected with a medical bone screw clamping device; the output end of the rotary loading system is connected with the test block clamping device; the force measuring device comprises a force measuring sensor and a torque sensor, the torque sensor is connected to the movable seat, and the force measuring sensor is connected between the axial loading system and the movable seat.
Description
Technical Field
The invention relates to a double-position testing machine for the compression-pull force rotation torque self-tapping performance of a medical bone screw, which is used for testing the comprehensive mechanical properties of the medical bone screw such as tensile force, shearing force, torsion and the like when being implanted into a human skeleton and in the skeleton, and belongs to the technical field of testing machines.
Background
The medical bone screw is used for an internal fixing device for fixing a fracture part, is used alone or combined with a bone fracture plate, and is commonly used as a cancellous bone screw, a cortical bone screw, a bone bolt, a hollow screw and the like.
When the medical screw is implanted into a human body, the medical screw needs to bear certain torque and pressure when being screwed into a bone, the medical screw usually bears the comprehensive action of bending stress, tensile force and shearing stress after being implanted into the bone, and the bone screw is easy to break and loosen in clinical failure, so that the internal fixation is finally failed.
Disclosure of Invention
The invention aims to provide a double-position testing machine for the screwing-unscrewing torque and the self-tapping performance of a medical bone screw, which can test the screwing-unscrewing torque and the self-tapping performance borne by the medical bone screw in clinical use, and can test the comprehensive mechanics such as the extraction force borne after the medical bone screw is screwed in, the pressure during screwing in and the like.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a medical bone screw pressing and pulling force rotating torque self-tapping performance double-position testing machine comprises a rack, an axial loading system, a rotary loading system and a clamping device; wherein:
the clamping device comprises a medical bone screw clamping device and a test block clamping device, the medical bone screw clamping device and the test block clamping device are distributed on the rack at intervals, and the central lines of the medical bone screw clamping device and the test block clamping device are positioned on the same horizontal line;
the axial loading system is used for driving the movable seat to move back and forth along the horizontal direction of the rack, and the movable seat is connected with a medical bone screw clamping device;
the output end of the rotary loading system is connected with the test block clamping device;
the force measuring device comprises a force measuring sensor and a torque sensor, the torque sensor is connected to the movable seat, and the force measuring sensor is connected between the axial loading system and the movable seat.
The preferred scheme of the medical bone screw pressing and pulling force rotating torque self-tapping performance double-position testing machine is that an axial loading system comprises an axial loading motor, a speed reducer I, a ball screw pair, a moving seat, a guide rail sliding block pair I and a guide plate; the axial loading motor is directly connected with the speed reducer I and is connected with a lead screw of the ball screw pair through a coupler, a nut of the ball screw pair is connected with one end of the guide plate, and the other end of the guide plate is connected with a slide block of the guide rail slide block pair I.
The preferred scheme of the medical bone screw pressing and pulling force spinning torque self-tapping performance double-position testing machine further comprises a longitudinal adjusting device, the longitudinal adjusting device comprises a longitudinal guide rail sliding block pair and a moving plate, the moving plate can be detachably provided with the medical bone screw clamping device, the longitudinal guide rail sliding block pair forms a moving seat and a moving plate, and the moving plate is connected with a torque sensor through a double-position positioning pin.
The preferred scheme of the medical bone screw pressing and pulling force spinning torque self-tapping performance double-position testing machine is that a rotary load applying system comprises a rotary loading motor and a speed reducer II, the rotary loading motor is directly connected with the speed reducer II, and the output end of the speed reducer II is connected with a test block clamping device.
The preferred scheme of the medical bone screw pressing and pulling force spinning torque self-tapping performance two-position testing machine is that a medical bone screw clamping device comprises an ER extension rod, a spring chuck and a locking nut, one end of the ER extension rod is connected with a moving plate, the other end of the ER extension rod is connected with the spring chuck, the other end of the spring chuck is connected with the locking nut used for being connected with a medical bone screw, and the ER extension rod is in taper fit with the spring chuck.
The preferred scheme of medical bone screw pressure-pull force spinning moment of torsion self-tapping performance dibit testing machine, clamping device still include screw drawing power clamping device, screw drawing power clamping device is including tensile seat, press from both sides tight piece and locking screw, the movable plate is connected to tensile seat one end, a plurality of tight pieces of clamp are connected to the tensile seat other end, be equipped with rectangular groove on the tensile seat, press from both sides the piece and can follow the rectangular groove of tensile seat and make a round trip to slide, form the tight space I that presss from both sides tight medical bone screw, and press from both sides between tight piece and the tensile seat and fix a position through locking screw locking.
The preferred scheme of the medical bone screw pressing and pulling force spinning torque self-tapping performance double-position testing machine is characterized in that the clamping device further comprises a bending clamping device, the bending clamping device comprises a screw clamping seat, a pressing plate and a locking screw, the screw clamping seat is of an L-shaped structure, the vertical part of the screw clamping seat is connected to the module clamping device for the test, the horizontal part of the screw clamping seat is provided with an inclined plane, a clamping space II for clamping the medical bone screw is formed between the inclined plane and the pressing plate, and the pressing plate and the inclined plane are connected in a locking mode through the locking screw.
The preferred scheme of the medical bone screw pressing and pulling force rotating torque self-tapping performance double-position testing machine is that a module clamping device for testing is a three-jaw chuck.
The invention has the advantages that:
the medical bone screw clamping device, the test block clamping device, the screw drawing force clamping device and the bending clamping device are arranged, different types of tests are completed by matching with the axial loading system and the rotary loading system, multifunctional comprehensive mechanical tests of screwing-in and screwing-out torque, self-tapping performance, drawing-out force, bending force and the like of the medical bone screw are realized, and quality assurance is provided for the medical bone screw in clinical use.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic front view of an embodiment of the present invention.
FIG. 2 is a schematic side view of an embodiment of the present invention.
FIG. 3 is a schematic top view of an embodiment of the present invention.
FIG. 4 is a schematic diagram of a screwing-in/out torque and a self-tapping force test according to an embodiment of the present invention.
Fig. 5 is a schematic drawing of the pull force test according to the embodiment of the present invention.
Fig. 6 is a schematic view of a press bending test according to an embodiment of the present invention.
Fig. 7 is a schematic structural view of a medical bone screw clamping device according to an embodiment of the invention.
Fig. 8 is a schematic structural view of a screw pullout force clamping device according to an embodiment of the present invention.
Fig. 9 is a schematic structural view of a press bending clamping device according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, 2 and 3, a medical bone screw pressing and pulling force screwing torque self-tapping performance double-position testing machine comprises a rack 1, an axial loading system, a rotary loading system and a clamping device; wherein:
the clamping device comprises a medical bone screw clamping device 7 and a test block clamping device 9, the medical bone screw clamping device 7 and the test block clamping device 9 are distributed on the rack 1 at intervals, and the central lines of the medical bone screw clamping device 7 and the test block clamping device 9 are positioned on the same horizontal line;
the axial loading system is used for driving the movable seat 4 to move back and forth along the horizontal direction of the rack 1, the movable seat 4 is connected with the medical bone screw clamping device 7, and the axial load is applied to the medical bone screw while the adjustment of the test space can be completed;
the output end of the rotary loading system is connected with a test block clamping device 9 to complete the application of the rotary torque and the self-tapping torque of the medical bone screw;
the force measuring device comprises a force measuring sensor 2 and a torque sensor, the torque sensor is connected to the movable seat 4, and the force measuring sensor 2 is connected between the axial loading system and the movable seat 4.
Referring to fig. 1, the axial loading system includes an axial loading motor 12, a speed reducer i 13, a ball screw pair 15, a moving seat 4, a guide rail slider pair i 8 and a guide plate 16; the axial loading motor 12 is directly connected with the speed reducer I13 and is connected with a lead screw of the ball screw pair 15 through the coupler 14, a nut of the ball screw pair 15 is connected with one end of the guide plate 16, and the other end of the guide plate 16 is connected with a slide block of the guide rail slide block pair I8. The axial loading motor 12 rotationally drives the ball screw to rotate, and the rotary motion is changed into linear motion through guiding of the guide rail slide block pair I8. The part is arranged at the bottom of a rack 1, and a force measuring sensor 2 penetrates through the rack 1 and is connected with a movable seat 4 to realize axial movement push-pull loading.
Referring to fig. 1 and 2, the bone screw clamping device further comprises a longitudinal adjusting device, the longitudinal adjusting device comprises a longitudinal guide rail slider pair 5 and a moving plate 6, the moving plate 6 can be detachably provided with a medical bone screw clamping device 7, the longitudinal guide rail slider pair 5 forms a position between a moving seat 4 and the moving plate 6, and the moving plate 6 is connected with a torque sensor through a two-position positioning pin 3.
Referring to fig. 1, the rotary load applying system comprises a rotary loading motor 11 and a speed reducer ii 10, the rotary loading motor 11 is directly connected with the speed reducer ii 10, and an output end of the speed reducer ii 10 is connected with the test block clamping device 9. The rotary loading motor 11 rotates, the speed is reduced through the speed reducer II 10, the test block clamping device 9 is driven, the test module is screwed into the medical bone screw, screwing-in torque is measured, and the rotary loading motor 11 is turned over, and screwing-out torque is measured.
Referring to fig. 3, 2 torque sensors, i.e. a torque sensor i 18 and a torque sensor ii 19, are mounted on the moving plate 6, and can be selected according to different specifications of medical bone screws, and the torque sensors are mounted with the medical bone screw clamping device 7.
Referring to fig. 1 and 3, a two-position locating pin 3 is used to locate 2 torque sensors of different range specifications. The testing machine adopts two torque sensors with different specifications, and is suitable for medical bone screws with different specifications and different testing requirements (screwing-in torque, screw breaking torque). The torque sensor I18 and the torque sensor II 19 are horizontally arranged on the moving plate 6, the moving plate 6 is connected with the moving seat 4 through the longitudinal guide rail sliding block pair 5, and the two-position positioning pin 3 penetrates through the moving seat 4 to be positioned with the moving plate 6, so that the positioning of 2 different sensors is realized.
Referring to fig. 4 and 7, the medical bone screw clamping device 7 includes an ER extension rod 7.1, a collet chuck 7.2 and a lock nut 7.3, one end of the ER extension rod 7.1 is connected with the moving plate 6, the other end of the ER extension rod 7.1 is connected with the collet chuck 7.2, the other end of the collet chuck 7.2 is connected with the lock nut 7.3 for connecting the medical bone screw 20, and the ER extension rod 7.1 and the collet chuck 7.2 are in taper fit. The medical bone screw 20 is placed into the collet 7.2, then the medical bone screw is inserted into the locking nut 7.3 together, and then the medical bone screw 20 is tightly clamped by screwing along the thread of the ER extension rod 7.1 and deforming and compressing the collet 7.2 along with the screwing of the locking nut 7.3 due to the taper in the ER extension rod 7.1.
Referring to fig. 5 and 8, the clamping device further includes a screw drawing force clamping device 22, the screw drawing force clamping device 22 includes a stretching seat 22.1, clamping blocks 22.2 and locking screws 22.3, one end of the stretching seat 22.1 is connected with the moving plate 6, the other end of the stretching seat 22.1 is connected with a plurality of clamping blocks 22.2, a long groove is formed in the stretching seat 22.1, the clamping blocks 22.2 can slide back and forth along the long groove of the stretching seat 22.1 to form a clamping space i for clamping the medical bone screw 20, and the clamping blocks 22.2 and the stretching seat 22.1 are locked and positioned by the locking screws 22.3. The medical bone screw 20 is placed into the stretching seat 22.1, the clamping block 22.2 is adjusted to slide along the strip groove, the medical bone screw 20 is gradually clamped, the locking screw 22.3 is locked at the moment, and the screw cannot be separated at the moment due to the fact that the head part of the screw is larger than the rod part, and a bone screw drawing force test can be completed.
Referring to fig. 6 and 9, the clamping device further includes a bending clamping device 25, the bending clamping device 25 includes a screw clamping seat 25.1, a pressing plate 25.2 and a locking screw 25.3, the screw clamping seat 25.1 is an L-shaped structure, a vertical portion of the screw clamping seat 25.1 is connected to the module clamping device 9 for testing, a horizontal portion of the screw clamping seat 25.1 has an inclined surface, a clamping space ii for clamping the medical bone screw 20 is formed between the inclined surface and the pressing plate 25.2, the pressing plate 25.2 and the inclined surface are connected in a locking manner through the locking screw 25.3, and the inclined surface in this embodiment forms an included angle of 45 degrees with respect to a central line of the medical bone screw clamping device 7. The medical bone screw 20 is placed into the screw clamping seat 25.1, the pressure plate 25.2 is used for compressing the medical bone screw 20, and then the locking screw 25.3 is locked, so that the bending test of the medical bone screw 20 can be completed. The screw holder 25.1 is inserted into the test block holder 9 and the distance is adjusted as required. The medical bone screw pressure head 23 is arranged in the medical bone screw clamping device 7 and locked, the testing machine is started to enable the medical bone screw pressure head 23 to slowly approach the medical bone screw 24 and bend, and the system records data such as a bending force value and displacement.
In this embodiment, the module holding device 9 for test is a three-jaw chuck.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a medical bone screw pressure-pull force spinning moment of torsion self tapping performance dibit testing machine which characterized in that: comprises a rack (1), an axial loading system, a rotary loading system and a clamping device; wherein:
the clamping device comprises a medical bone screw clamping device (7) and a test block clamping device (9), the medical bone screw clamping device (7) and the test block clamping device (9) are distributed on the rack at intervals, and the central lines of the medical bone screw clamping device and the test block clamping device are positioned on the same horizontal line;
the axial loading system is used for driving the movable seat to move back and forth along the horizontal direction of the rack (1), and the movable seat is connected with a medical bone screw clamping device (7);
the output end of the rotary loading system is connected with a test block clamping device (9);
the force measuring device comprises a force measuring sensor (2) and a torque sensor, the torque sensor is connected to the movable seat (4), and the force measuring sensor (2) is connected between the axial loading system and the movable seat (4).
2. The medical bone screw pressure-pulling force screwing torque self-tapping performance two-position testing machine according to claim 1, characterized in that: the axial loading system comprises an axial loading motor (12), a speed reducer I (13), a ball screw pair (15), a moving seat (4), a guide rail sliding block pair I (8) and a guide plate (16); the axial loading motor (12) is directly connected with the speed reducer I (13) and is connected with a lead screw of the ball screw pair (15) through a coupler (14), a nut of the ball screw pair (15) is connected with one end of a guide plate (16), and the other end of the guide plate (16) is connected with a slide block of the guide rail slide block pair I (8).
3. The medical bone screw pressure-pulling force screwing torque self-tapping performance two-position testing machine according to claim 2, characterized in that: the bone screw clamping device is characterized by further comprising a longitudinal adjusting device, the longitudinal adjusting device comprises a longitudinal guide rail sliding block pair (5) and a moving plate (6), the moving plate (6) can be detachably provided with a medical bone screw clamping device (7), the longitudinal guide rail sliding block pair (5) forms a position between the moving seat (4) and the moving plate (6), and the moving plate (6) is connected with a torque sensor through a two-position positioning pin (3).
4. The medical bone screw pressure-pulling force screwing torque self-tapping performance two-position testing machine according to claim 1, characterized in that: the rotary load applying system comprises a rotary loading motor (11) and a speed reducer II (10), the rotary loading motor (11) is directly connected with the speed reducer II (10), and the output end of the speed reducer II (10) is connected with the test block clamping device (9).
5. The medical bone screw pressure-pulling force screwing torque self-tapping performance two-position testing machine according to claim 1, characterized in that: medical bone screw clamping device (7) include ER extension rod (7.1), collet chuck (7.2) and lock nut (7.3), moving plate (6) are connected to ER extension rod (7.1) one end, collet chuck (7.2) are connected to ER extension rod (7.1) other end, collet chuck (7.2) other end connection is used for connecting lock nut (7.3) of medical bone screw (20), pass through taper fit between ER extension rod (7.1) and collet chuck (7.2).
6. The medical bone screw pressure-pulling force screwing torque self-tapping performance two-position testing machine according to claim 1, characterized in that: clamping device still includes screw drawing power clamping device (22), screw drawing power clamping device (22) are including tensile seat (22.1), press from both sides tight piece (22.2) and locking screw (22.3), movable plate (6) is connected to tensile seat (22.1) one end, a plurality of tight pieces of clamp (22.2) are connected to tensile seat (22.1) other end, be equipped with rectangular groove on tensile seat (22.1), press from both sides tight piece (22.2) and can slide along the rectangular groove of tensile seat (22.1) back and forth, form the tight space I that presss from both sides tight medical bone screw (20), and press from both sides between tight piece (22.2) and tensile seat (22.1) through locking screw (22.3) locking positioning.
7. The medical bone screw pressure-pulling force screwing torque self-tapping performance two-position testing machine according to claim 1, characterized in that: the clamping device further comprises a bending clamping device (25), the bending clamping device (25) comprises a screw clamping seat (25.1), a pressing plate (25.2) and a locking screw (25.3), the screw clamping seat (25.1) is of an L-shaped structure, the vertical part of the screw clamping seat (25.1) is connected to the module clamping device (9) for the test, the horizontal part of the screw clamping seat (25.1) is provided with an inclined plane, a clamping space II for clamping the medical bone screw (20) is formed between the inclined plane and the pressing plate (25.2), and the pressing plate (25.2) and the inclined plane are in locking connection through the locking screw (25.3).
8. The medical bone screw pressure-pulling force screwing torque self-tapping performance two-position testing machine according to any one of claims 1 to 7, characterized in that: the module clamping device (9) for test is a three-jaw chuck.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110940935.8A CN113720541B (en) | 2021-08-17 | 2021-08-17 | Medical bone screw press-pull force rotating torque self-tapping performance double-position testing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110940935.8A CN113720541B (en) | 2021-08-17 | 2021-08-17 | Medical bone screw press-pull force rotating torque self-tapping performance double-position testing machine |
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| Publication Number | Publication Date |
|---|---|
| CN113720541A true CN113720541A (en) | 2021-11-30 |
| CN113720541B CN113720541B (en) | 2024-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110940935.8A Active CN113720541B (en) | 2021-08-17 | 2021-08-17 | Medical bone screw press-pull force rotating torque self-tapping performance double-position testing machine |
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| JPS6242032A (en) * | 1985-08-19 | 1987-02-24 | Tokyo Inst Of Technol | Elastic plastic area tightening screw performance testing device |
| CN2807243Y (en) * | 2005-06-01 | 2006-08-16 | 上海新三思计量仪器制造有限公司 | Double slant opposite-opening type steel strand tension test clamp |
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| Publication number | Publication date |
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| CN113720541B (en) | 2024-07-05 |
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