CN207432088U - A kind of screw clamping device and screw instrument - Google Patents

Abstract

The utility model is related to a kind of screw clamping device, including：Main body is connected with the screw instrument；Clamping device, positioned at the main body along longitudinal direction axis front end simultaneously can clamp screws clip position and unclamp screw released position between move, the clamping device include at least two clamping limbs；Driving mechanism, the clamping device is driven to move, the driving mechanism, which includes at least two groups of connection units for being connected respectively the clamping limb and the corresponding guidance unit for guiding the connection unit movement, every group of connection unit, includes the first connector and the second connector；First connector and the second connector at least while carry out longitudinal shift and transverse shift, and the clamping limb is driven to generate transverse direction and longitudinal direction movement, so as to which the clamping limb translation be driven to clamp or unclamped.The utility model ensures that contact of the clamping limb with screw is always that line contact or face contact so that clamping is more secured.

Description

A kind of screw clamping device and screw instrument

Technical field

The utility model is related to a kind of screw clamping device and screw instruments.

Background technology

In the daily life of the mankind, screw is very common, can be applied to many occasions.Such as filled in house During repairing, it is often necessary to two blocks of separated plates of script be linked together, this is just hammered into screw in plate.Also for example Either hanging articles also may require that on corresponding wall or hammer into screw on ceiling on ceiling on wall.We The thing that the needs such as this kind of plate or wall are hammered by screw is referred to as workpiece.For screw being hammered into the process of workpiece, People mainly consider following factor：Workpiece is always hammered into the normal direction of vertical surface 1. wishing screw.2. screw is screwed into work Too many strength need not be spent during part, plays the effect for saving labourer's muscle power.3. the whole process for being screwed into screw is spent Time try one's best it is short, labourer's the time it takes can be saved.For this purpose, only the work axis of head and the side of workpiece precession It is to ensure the necessary condition that hammers into the predetermined direction of workpiece to being consistent, otherwise deviateing the component in precession direction can cause Workpiece is gradually deviated from predetermined direction in itself, and firmly bigger such deviation is more serious, can not meet the expectation of people.

In this regard, Chinese patent literature CN104108086A discloses a kind of screw clamping device, including main body, at least have The clamping device of two clamping limbs and the driving mechanism for driving clamping device folding, driving mechanism is by two axis pins respectively two Slip in a sliding slot drives the clamping limb to be axially moved and move pivotally, so as to fulfill the folding of clamping limb.This kind of screw clamp The inclined situation of screw can be prevented when screw instrument is screwed into screw by holding device, have very high application value；However, This kind of screw clamping device is when clamping the screw of different-diameter, since its clamping limb is pivotably folding, Contact of the clamping limb with screw is caused to there is a situation where point contact, the clamping of screw is not sufficiently stable so as to cause clamping limb, spiral shell Nail is difficult to be consolidated support or even easily drop.

Utility model content

Therefore, the technical problems to be solved in the utility model is to overcome screw clamping device clamp screws in the prior art The defects of unstable, so as to provide a kind of screw clamping device and screw instrument.

A kind of screw clamping device, for additional screws instrument positioning screw, it is defeated that the screw instrument provides rotary power Go out to the screw, the screw clamping device includes：

Main body is connected with the screw instrument；

Clamping device, positioned at the front end of main body axis along longitudinal direction simultaneously can be in clamp screws clip position and release It is moved between the released position of screw, the clamping device includes at least two clamping limbs；

Driving mechanism, drives the clamping device to move, and the driving mechanism is connected respectively institute including at least two groups The connection unit and the corresponding guidance unit for guiding the connection unit movement, every group of connection unit for stating clamping limb include first Connector and the second connector；

First connector and the second connector at least while carry out longitudinal shift and transverse shift, and then described in driving Clamping limb generates transverse direction and longitudinal direction movement.

Further, the guidance unit includes guiding first connector, the sliding slot of the second connector movement, described Sliding slot is included at least compared with the inclined rake of the longitudinal axis, and first connector, the second connector are located at described The angle of line and longitudinal axis between first connector and the second connector is not changed when being moved in rake.

Further, the sliding slot further includes the extension for the Longitudinal extending for connecting the rake；First connection The second connector moves in the rake described in when part moves in the extension, so as to which the clamping limb be driven to carry out Pivoting action and linear longitudinal movement.

Further, the main body includes upper holder, lower fixed frame, and the sliding slot is arranged on the lower fixed frame.

Further, the driving mechanism further include can compared with main body slide sliding rack and driving bias piece, institute Stating sliding rack has the perforation for connecting first, second connector, and the perforation is in extend laterally setting；The driving bias Part longitudinally biases the sliding rack.

Further, the sliding rack is provided with abutting part, and the abutting part is before axis is connected to and helps arm along longitudinal direction End.

A kind of screw instrument, for screw to be hammered into workpiece, including screw clamping device as the aforementioned.

Further, the screw instrument further includes to install the screw clamping device to the mating of screw instrument Mechanism, described adapting mechanism one end are coupled with screw clamping device, and the other end is coupled with screw instrument.

Further, the screw clamping device and the detachable mating of adapting mechanism.

Further, the adapting mechanism includes supporting the stent of the main body and the sliding rack can be driven axial The actuated piece of reciprocating motion.

Further, the stent is elongated member；The actuated piece is axially slidably mounted on the stent On elongated member；A bar hole is formed on the stent, by passing through the connecting portion of the bar hole, the actuated piece It is connected with sliding rack；The bar shaped hole length is not less than the axial displacement described in the actuated piece folding needed for clamping limb.

Further, the screw instrument forms the containing cavities extended longitudinally；The stent can pacify to longitudinal extension In the containing cavities, so as to which the screw clamping device be driven to switch between operating position and off-position.

Further, between the stent and the containing cavities, equipped with holding mechanism and for the stent to be driven to transport The first dynamic bias piece, the holding mechanism keep the stent to be received into the containing cavities, and first bias piece is to institute It states stent and applies the biasing force moved towards longitudinal front end.

Further, the holding mechanism is molded the first retaining surface on the bracket including one and movably sets It puts and is forming the holding for physically coordinating first retaining surface that the stent is prevented to be moved to longitudinal front end of the containing cavities Pin.

Further, the second retaining surface is formed on the actuated piece, the retaining pin coordinates second retaining surface gram The biasing force of clothes driving bias piece keeps the clamping device to be in released position, while overcomes the bias of first bias piece It tries hard to keep and holds the stent in the off-position.

Further, the retaining pin is slidably arranged on the screw instrument, in the screw instrument and the guarantor It holds to be equipped between pin and is intended to coordinate the of the biasing force of first retaining surface or second retaining surface to the retaining pin Two bias pieces.

Further, an operating parts is further included, the operating parts is back and forth removable along the force direction of first bias piece It is arranged on dynamicly on the screw instrument, presses the biasing force that the operating parts overcomes retaining pin application the second bias piece Active force, coordinated with releasing the holding of the retaining pin and first retaining surface or second retaining surface.

Further, operating surface is also formed on the actuated piece, has on the operating parts and coordinates with the operating surface Protrusion, press the operating parts, operating surface described in the male cooperation drives the actuated piece and the sliding rack to overcome institute The biasing force for stating driving bias piece causes the clamping device in operating position to be in released position.

Further, the operating surface and second retaining surface are coplanar.

Technical solutions of the utility model have the following advantages that：

1. the utility model opens clamping limb by the way of translation so that contact of the clamping limb with screw is always that line connects It touches or face contacts, therefore, screw is clamped more stable；Meanwhile the utility model reduces the quantity of sliding slot so that manufacture It is easier.

2. the utility model sets containing cavities on screw instrument, pass through the change of receiving state of the stent in containing cavities To complete switching of the screw clamping device in operating position and off-position so that operation is easier.

Description of the drawings

It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution of the prior art Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it describes below In attached drawing be the utility model some embodiments, for those of ordinary skill in the art, do not paying creativeness On the premise of work, other attached drawings are can also be obtained according to these attached drawings.

Fig. 1 is the screw tool construction schematic diagram that the utility model is equipped with screw clamping device；

Screw tool construction schematic diagram when Fig. 2 is located at operating position for screw clamping device；

Screw tool construction schematic diagram when Fig. 3 is located at off-position for screw clamping device；

Fig. 4 is the screw tool construction schematic diagram after knockout screw clamping device；

Fig. 5 is the screw instrument decomposition diagram that the utility model is equipped with screw clamping device；

Fig. 6-1 is the decomposition diagram of the utility model screw clamping device；

Fig. 6-2 is the assembling schematic diagram of the utility model screw clamping device；

Fig. 7-1,7-2,7-3,7-4 are that screw is squeezed into workpiece by screw instrument of the utility model equipped with screw clamping device Procedure chart.

Reference sign：

1. screw instrument；2. shell；21. motor；22. axis of operation；23. handle；24. switch；25. battery pack；26. it passes Motivation structure；27. working end；28. work head；3 screw clamping devices；31. sliding rack；311. abutting part；32. main body；On 321. Fixed frame；322. lower fixed frame；4. stent；41 first retaining surfaces；51. the first perforation；52. sliding slot；521. rake；522. prolong Extending portion；531. first connectors；532. second connectors；54. drive bias piece；55. the second perforation；6. clamping limb；7. storage Chamber；8. actuated piece；81. connecting portion；82. the second retaining surface；9. the first bias piece；10 retaining pins；11. the second bias piece；12. Shape hole；13 operating parts；It is 131. raised；14. workpiece.

Specific embodiment

The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described Embodiment is the utility model part of the embodiment, instead of all the embodiments.Based on the embodiment in the utility model, sheet Field those of ordinary skill all other embodiments obtained without making creative work, belong to this practicality Novel protected scope.

, it is necessary to explanation in the description of the utility model, term " " center ", " on ", " under ", it is "left", "right", " perpendicular Directly ", the orientation of the instructions such as " level ", " interior ", " outer " or position relationship are based on orientation shown in the drawings or position relationship, are only The utility model must have specific with the device or element for simplifying description rather than instruction or hint meaning for ease of description Orientation, with specific azimuth configuration and operation, therefore it is not intended that limitation to the utility model.In addition, term " the One ", " second ", " the 3rd " are only used for description purpose, and it is not intended that instruction or hint relative importance.

, it is necessary to which explanation, unless otherwise clearly defined and limited, term " are pacified in the description of the utility model Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integrally Connection；Can be mechanical connection or electrical connection；It can be directly connected, can also be indirectly connected by intermediary, It can be the connection inside two elements.For the ordinary skill in the art, can above-mentioned art be understood with concrete condition Concrete meaning of the language in the utility model.

In addition, as long as technical characteristic involved in the utility model different embodiments disclosed below is each other Not forming conflict can be combined with each other.

It is the screw instrument of one embodiment of the utility model as shown in Figs 1-4, screw instrument here is either belong to The screwdriver or hand-operated tools of electric tool.In the present embodiment, screw instrument 1 includes a shell 2.It is received in shell 2 Have motor 21.Motor 21 extends approximately along an axis direction.Rotation of the motor 21 for generating around axis of operation 22 exports. Screw instrument further includes the handle 23 for gripping.Handle 23 along deviate the axis direction extend so that screw instrument 1 it is whole Body is in handgun shape.Handle 23 is equipped with to start or close the switch 24 of motor 21.For the ease of entire 1 body of screw instrument Long-pending miniaturization, in the bottom of handle 23 provided with the battery pack 25 to 21 power of motor.Battery pack 25 is can be repeatedly It charges, in the charging interface (not shown) that the outside of handle 23 is equipped with to charge to battery pack 25.In shell 2 also Transmission mechanism 26 including power connector motor 21.Transmission mechanism 26 is used to rotation output be transferred to the work of screw instrument 1 End 27.Working end 27 and handle 23 are located at the correspondence both sides of screw instrument 1.For convenience, screw instrument 1 close to work The one side at end 27 is defined as front side (left side in Fig. 1), and screw instrument 1 is positioned as rear side (in Fig. 1 close to the one side of handle 23 Right side).Screw instrument 1 includes the work first 28 positioned at front side.Work first 28 is subject to the driving of motor 21 and surrounds working shaft Line 22 rotates.When work, screw is abutted in work first 28.Screw is subject to the driving of work first 28 and rotates.

In the present embodiment, a screw clamping device 3 is also equipped in the front end of the work first 28, for additional screws instrument 1 positioning screw, the screw instrument 1 provide rotary power and export to the screw, and the screw clamping device 3 includes：

Main body 32 is connected with the screw instrument；

Clamping device, positioned at the front end of the main body 32 axis along longitudinal direction simultaneously can be in clamp screws clip position and pine It opens and moves between the released position of screw, the clamping device includes at least two clamping limbs 6；

Driving mechanism, drives the clamping device to move, and the driving mechanism is connected respectively institute including at least two groups The connection unit and the corresponding guidance unit for guiding the connection unit movement, the effect of connection unit for stating clamping limb 6 are Clamping device is fixedly connected with so that clamping device to be driven to move；In the present embodiment, every group of connection unit includes 531 He of the first connector Second connector 532.In an alternative embodiment, the number of connector can also be three or more.

First connector, 531 and second connector 532 at least while carries out longitudinal shift and transverse shift, drives institute It states clamping device and generates transverse direction and longitudinal direction movement, so as to which the translation of clamping limb 6 be driven to clamp or unclamped.Therefore, clamping limb 6 Open-close ways close or open for translation so that and contact of the clamping limb 6 with screw is always that line contact or face contact, therefore, folder Holding effect fruit is more preferable；In the present embodiment, clamping device is a pair compared with 22 symmetrically arranged clamping limb 6 of axis of operation；At one In alternate embodiment, the number of clamping limb 6 or four, in this way, can better auxiliary positioning screw；Certainly, Can be other arbitrary numbers.

The guidance unit includes guiding first connector 531, the sliding slot 52 of the second connector 532 movement, described Sliding slot 52 is included at least compared with the inclined rake 521 of the longitudinal axis, first connector 531, the second connector 532 be located in the rake 521 do not change when moving between 531 and second connector 532 of the first connector line with The angle of longitudinal axis, i.e., the movement of a pair of of clamping limb 6 is slanting linear motion, therefore, show be translation clamp or It unclamps.In the present embodiment, the first connector 531, the second connector 532 are axis pin.

The sliding slot 52 further includes the extension 522 for the Longitudinal extending for connecting the rake 521；First connector 531 second connectors 532 described in when being moved in the extension 522 move in the rake 521, described so as to drive Clamping limb 6 is pivoted movement and linear longitudinal movement.The purpose for setting extension 522 is in order in the last rank of drivescrew Section, by 6 Unscrew of guiding function clamping limb of extension to maximum position, to prevent screw head and clamping limb 6 Interference；Meanwhile in the case where clamping limb 6 is opened to maximum position, clamping device is moved to work first 28 from operating position Rear portion off-position, can eliminate screw clamping device to work first 28 influence.It is working on screw clamping device The handoff procedure of position and off-position will be explained hereinafter.

The main body 32 includes upper holder 321, lower fixed frame 322, and the sliding slot 52 is arranged at the lower fixed frame 322 On.

The driving mechanism further includes can be compared with the sliding rack 31 and driving bias piece 54 that main body 32 is slided, the cunning Moving frame 31 has the first perforation 51 and the second perforation 55 for connecting first connector 531, the second connector 532, and described the One perforation 51 and the second perforation 55 are in extend laterally setting；54 longitudinal direction of driving bias piece biases the sliding rack 31.This reality It applies in example, driving bias piece 54 is the spring being arranged between main body 32 and sliding rack 31；In an alternative embodiment, It drives bias piece 54 or magnetic mechanism, by attracting each other between magnetic mechanism or mutually exclusive reaches the work of driving With.In the present embodiment, sliding rack 31 is provided with abutting part 311, and axis is arranged at the front end for helping arm 6 to abutting part 311 along longitudinal direction； By pressing the withstanding effect between abutting part 311 or abutting part 311 and workpiece 14 sliding rack 31 is promoted to overcome driving bias piece 54 biasing force moves backward, and then opens clamping limb 6.

The screw clamping device 3 is mounted on by adapting mechanism on the screw instrument 1, adapting mechanism one end and screw Clamping device is coupled, and the other end is coupled with screw instrument；Screw clamping device and the detachable mating of adapting mechanism.

The adapting mechanism includes supporting the stent 4 of the main body 32 and can driving 31 axial reciprocating of sliding rack The actuated piece 8 of movement.

The stent 4 is elongated member；The actuated piece 8 be axially slidably install on the bracket 4 length Bar part；In the present embodiment, sliding slot is formed on stent 4, actuated piece 8, which is located at 4 lower section of stent and can be located in sliding slot, to be slided； A bar hole 12 is formed on the stent 4, by passing through the connecting portion 81 of the bar hole 12, the actuated piece 8 is with sliding Frame 31 connects；12 length of bar hole is not less than the axial displacement described in 8 folding of actuated piece needed for clamping limb 6.This reality It applies in example, connecting portion 81 is the connection bump being molded on actuated piece 8.

The course of work of the present embodiment screw clamping device is described below：

When needing folding clamping limb 6, abutting part 311 is pressed so as to which sliding rack 31 be driven to be axially moved；Or operation actuating Part 8 is axially moved, and since the front end of actuated piece 8 forms connecting portion 81, and connecting portion 81 is connected with sliding rack 31, therefore, band Dynamic sliding rack 31 is axially moved；And clamping limb 6 is connected by axis pin on sliding rack 31, therefore, sliding rack 31 drives 6 phase of clamping limb It axially moves for main body 32 and drives the first connector 531 in main body, the second connector 532 first in the inclination of sliding slot 52 It is slided in portion 521, and then clamping limb 6 is driven to translate backward and open or translate forward and close, that is, complete clamping device from folder Hold mutual switching of the position to released position.

The screw instrument forms the containing cavities 7 extended longitudinally；The stent 4 can be mounted on to longitudinal extension described In containing cavities 7, so as to which the screw clamping device 3 be driven to switch between operating position and off-position.

Between the stent 4 and the containing cavities 7, equipped with holding mechanism and for drive the support motion first Bias piece 9, the holding mechanism keep the stent 4 to be received into the containing cavities 7.

First bias piece 9 applies the stent 4 biasing force towards longitudinal front end movement, the holding mechanism bag It includes first retaining surface 41 being molded on the stent 4 and is movably disposed at and form the containing cavities 7 physically The retaining pin 10 for coordinating first retaining surface 41 that the stent 4 is prevented to be moved to longitudinal front end.

The second retaining surface 82 is formed on the actuated piece 8, the retaining pin 10 coordinates second retaining surface 82 to overcome The biasing force of first bias piece 9 keeps the clamping device, i.e. clamping limb 6 is in released position, while overcomes described first partially The biasing force of casting die 9 keeps the stent 4 in the off-position.

The retaining pin 10 is slidably arranged on the screw instrument 1, in the screw instrument 1 and the retaining pin 10 Between be equipped with the retaining pin 10 is intended to coordinate the biasing force of first retaining surface 41 or second retaining surface 82 Second bias piece 11.

Screw instrument 1 further includes an operating parts 13, and the operating parts 13 is reciprocal along the force direction of first bias piece 9 It is movably disposed on the screw instrument 1, presses the operating parts 13 and second bias is overcome to the retaining pin 10 application The active force of the biasing force of part 11, to release the retaining pin 10 and first retaining surface 41 or second retaining surface 82 Keep cooperation.In the present embodiment, the first bias piece 9 is spring, is installed between containing cavities 7 and stent 4；First bias piece 9 is right Stent 4 applies the biasing force moved towards operating position.In other alternative embodiments, the first bias piece 9 or Magnetic mechanism or other elastomeric elements.

Operating surface is also formed on the actuated piece 8, there is the protrusion with operating surface cooperation on the operating parts 13 131, the operating parts 13 is pressed, raised 131 cooperation operating surface drives 31 grams of the actuated piece 8 and the sliding rack The biasing force for taking the driving bias piece 54 causes the clamping device i.e. clamping limb 6 in operating position is in unclamp position It puts.

The operating surface and second retaining surface 82 are coplanar.

The use process of present embodiment screw instrument is described below：

When needing using screw clamping device, pressing operations part 13, at this point, retaining pin 10 is under the action of operating parts 13 It moves downward, so as to leave the second retaining surface 82, at this point, stent 4 is popped up forward under the action of the first bias piece 9 to working position It puts, then raised 131 the second retaining surfaces of backstop 82；At this point, screw clamping device 1 is in operating position；Pressing operations part again 13, protrusion 131 drives the second retaining surface 82 to move backward, translates and beats backward so as to operate the clamping limb 6 of screw clamping device 3 It opens, at this point, screw can be packed into；After screw is packed into, unclamps operating parts 13 and complete load screws；As shown in Fig. 7-1 to 7-4, with It screw and is driven into workpiece 14, the abutting part 311 of 3 front end of screw clamping device is contacted with workpiece 14 and gradually pressed by workpiece 14 Contracting, so as to which sliding rack 31 be driven to move backward to open clamping limb 6, and then avoids the influence that clamping limb 6 squeezes into screw； After screw is squeezed into completely, under the bias effect of driving bias piece 54, clamping limb 6 recovers clamped condition.

When clamping function need not be used, sliding rack 31 is pressed, sliding rack 31 drives clamping limb 6 to translate opening backward Afterwards, under the guiding of rake 521 and extension 522, clamping limb 6 first translate opening after rotation be flared to maximum position；Into one Step pressing sliding rack 31, so as to drive stent 4 that the active force of bias piece 9 is overcome to move to off-position backward, at this time second Retaining surface 82 coordinates with retaining pin 10, so as to which actuated piece 8 is locked to off-position together with stent 4 and screw clamping device, Since actuated piece 8 is to the brake function of sliding rack 31, in off-position, claw 6 is stayed open in maximum position, and is located at work Make head rear end；At this point, screw clamping device will not have an impact the work for the head that works；Screw need not be used when the long period During clamping device, screw clamping device can be removed, at this point, further pressing stent 4, the first retaining surface and 41 pin 10 can be kept Locking；In this state, the use of screw instrument 1 is more convenient.

Obviously, the above embodiments are merely examples for clarifying the description, and is not intended to limit the embodiments.It is right For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or It changes.There is no necessity and possibility to exhaust all the enbodiments.And the obvious variation thus extended out or Among the protection domain that variation is created still in the utility model.

Claims (19)

1. a kind of screw clamping device, for additional screws instrument positioning screw, the screw instrument provides rotary power output To the screw, the screw clamping device includes：

Main body is connected with the screw instrument；

Clamping device, positioned at the main body along longitudinal direction axis front end simultaneously can clamp screws clip position and unclamp screw Released position between move, the clamping device include at least two clamping limbs；

Driving mechanism, drives the clamping device to move, and the driving mechanism is connected respectively the folder including at least two groups The connection unit of gripping arm and the corresponding guidance unit for guiding the connection unit movement, every group of connection unit include the first connection Part and the second connector；

It is characterized in that, first connector and the second connector at least while carry out longitudinal shift and transverse shift, and then The clamping limb is driven to generate transverse direction and longitudinal direction movement.

2. screw clamping device according to claim 1, it is characterised in that：The guidance unit includes guiding described first Connector, the sliding slot of the second connector movement, the sliding slot are included at least compared with the inclined rake of the longitudinal axis, institute State the first connector, the second connector is located at when being moved in the rake and does not change first connector and the second connector Between the angle of line and longitudinal axis.

3. screw clamping device according to claim 2, it is characterised in that：The sliding slot further includes the connection rake Longitudinal extending extension；The second connector is in the inclination described in when first connector moves in the extension It is moved in portion, so as to which the clamping limb be driven to be pivoted movement and linear longitudinal movement.

4. screw clamping device according to claim 3, it is characterised in that：The main body includes upper holder, lower fixation Frame, the sliding slot are arranged on the lower fixed frame.

5. screw clamping device according to claim 1, it is characterised in that：The driving mechanism further includes can be compared with master Sliding rack and driving bias piece that body slides, the sliding rack have connect first connector, the second connector is worn Hole, the perforation are in extend laterally setting；The driving bias piece longitudinally biases the sliding rack.

6. screw clamping device according to claim 5, it is characterised in that：The sliding rack is provided with abutting part, described Axis is connected to the front end of the clamping limb to abutting part along longitudinal direction.

7. a kind of screw instrument, for screw to be hammered into workpiece, it is characterised in that：Including such as any one of claim 1-6 institutes The screw clamping device stated.

8. screw instrument according to claim 7, it is characterised in that：The screw instrument is further included for by the screw Clamping device is installed to the adapting mechanism of screw instrument, and described adapting mechanism one end is coupled with screw clamping device, the other end with Screw instrument is coupled.

9. screw instrument according to claim 8, it is characterised in that：The screw clamping device is separated with adapting mechanism Formula is coupled.

10. screw instrument according to claim 9, it is characterised in that：The driving mechanism further includes can be compared with main body The sliding rack and driving bias piece, the sliding rack of slip have the perforation for connecting first connector, the second connector, The perforation is in extend laterally setting；The driving bias piece longitudinally biases the sliding rack；The adapting mechanism includes being used for It supports the stent of the main body and the actuated piece of the sliding rack axially reciprocating can be driven.

11. screw instrument according to claim 10, it is characterised in that：The stent is elongated member；The actuating Part is the elongated member axially slidably installed on the bracket；A bar hole is formed on the stent, by wearing The connecting portion of the bar hole is crossed, the actuated piece is connected with sliding rack；The bar shaped hole length is opened not less than the actuated piece Close the axial displacement needed for the clamping limb.

12. the screw instrument according to claim 10 or 11, it is characterised in that：The screw instrument forms to be prolonged along longitudinal direction The containing cavities stretched；The stent can be mounted in the containing cavities to longitudinal extension, so as to which the screw clamping device be driven to exist Switch between operating position and off-position.

13. screw instrument according to claim 12, it is characterised in that：Between the stent and the containing cavities, if There are holding mechanism and the first bias piece for driving the support motion, the holding mechanism keeps the stent to be received into institute It states in containing cavities, first bias piece applies the stent biasing force towards longitudinal front end movement.

14. screw instrument according to claim 13, it is characterised in that：The holding mechanism is molded over described including one The first retaining surface on stent and it is movably disposed at physically cooperation the first retaining surface resistance for forming the containing cavities The retaining pin that only stent is moved to longitudinal front end.

15. screw instrument according to claim 14, it is characterised in that：The second retaining surface is formed on the actuated piece, The retaining pin coordinates second retaining surface to overcome the biasing force of driving bias piece that the clamping device is kept to be in release position It puts, while the biasing force of first bias piece is overcome to keep the stent in the off-position.

16. screw instrument according to claim 15, it is characterised in that：The retaining pin is slidably arranged in the screw On instrument, it is equipped between the screw instrument and the retaining pin and the retaining pin is intended to coordinate first retaining surface Or the second bias piece of the biasing force of second retaining surface.

17. screw instrument according to claim 16, it is characterised in that：Further include an operating parts, the operating parts is along institute The force direction for stating the first bias piece is back and forth movably disposed on the screw instrument, presses the operating parts to the guarantor The active force that pin application overcomes the biasing force of the second bias piece is held, to release the retaining pin and first retaining surface or described The holding cooperation of second retaining surface.

18. screw instrument according to claim 17, it is characterised in that：Operating surface, institute are also formed on the actuated piece The protrusion having on operating parts with operating surface cooperation is stated, presses the operating parts, operating surface band described in the male cooperation It moves the actuated piece and the sliding rack overcomes the biasing force of the driving bias piece to cause the clamping in operating position Mechanism is in released position.

19. screw instrument according to claim 18, it is characterised in that：The operating surface is total to second retaining surface Face.