CN214517781U - Clamping jaw of drill chuck and drill chuck - Google Patents

Abstract

The clamping jaw comprises a clamping jaw body and a clamping jaw cutting edge, wherein one side of the clamping jaw body is provided with a clamping inclined plane, the clamping inclined plane extends obliquely relative to the axis of the clamping jaw body, and a clamping jaw groove is formed in the clamping inclined plane; the clamping jaw cutting edge can shrink in order to enter into the clamping jaw recess when cooling to recover back and clamping jaw recess interference fit at cooling contraction state, thereby need not hot working, also need not extra connecting pieces such as welding flux and can reliably install the clamping jaw cutting edge in the clamping jaw recess on the clamping jaw body, can avoid the clamping jaw to take place the heat altered shape.

Description

Clamping jaw of drill chuck and drill chuck

Technical Field

The present disclosure relates to the field of drilling tool technology, and in particular, to a clamping jaw of a drill chuck and a drill chuck.

Background

The drill chuck is one of the main accessories in the electric tool industry and the machine tool industry, is widely applied to electric hand drills, drilling machines and the like, is matched with electric drills and is used for clamping working heads of drilling tools and the like.

The drill chuck comprises: the drill body and the clamping jaw installed on the drill body. The clamping of drilling tools and the like is realized through the matching of a plurality of clamping jaws. The clamping jaw is provided with a clamping jaw edge, and when clamping is carried out, the clamping jaw edge is contacted with the drilling tool to clamp the drilling tool. In order to obtain a better clamping effect, the hardness and the wear resistance of a clamping jaw edge are improved by quenching the clamping jaw in the prior art, however, the processing mode belongs to hot processing, and the clamping jaw is subjected to thermal deformation such as distortion, tilting and the like, so that the normal use of the clamping jaw is influenced.

Based on this, another prior art manufactures the clamping jaw margin with the hardness meeting the requirements by firstly manufacturing the clamping jaw margin, and then welds the manufactured clamping jaw margin with the hardness meeting the requirements on the clamping jaw body through welding agent to form the clamping jaw, but the welding also belongs to hot working, the clamping jaw can be thermally deformed in the production process, and the existence of the welding agent can influence the assembly precision of the clamping jaw margin.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem mentioned above or at least partially solve the technical problem mentioned above, the present disclosure provides a clamping jaw of a drill chuck and a drill chuck.

In a first aspect, the present disclosure provides a clamping jaw of a drill chuck, which includes a clamping jaw body and a clamping jaw margin, wherein one side of the clamping jaw body is provided with a clamping inclined plane, the clamping inclined plane extends obliquely relative to an axis of the clamping jaw body, and a clamping jaw groove is formed on the clamping inclined plane; the jaw margin may contract upon cooling to enter the jaw recess and to interferingly engage the jaw recess after the cooling contraction state has been restored.

Optionally, the notch of the jaw groove has a convex portion that can be bent toward the direction of the jaw margin to press against the jaw margin after the jaw margin enters the jaw groove.

Optionally, the two side notches of the jaw groove are provided with the convex parts.

Optionally, the convex part is formed by performing multi-point riveting on the notch;

alternatively, the convex portion is formed by roll caulking the notch.

Optionally, the jaw margin comprises a margin body and a clamping portion disposed on a side of the margin body facing out of the notch of the jaw groove;

and at least part of the surface of the blade edge body, which is matched with the clamping jaw groove, is provided with an anti-skidding structure.

Optionally, the anti-slip structure comprises a plurality of anti-slip protrusions arranged at intervals along the surface of the blade edge body, and the anti-slip protrusions protrude in a direction away from the blade edge body.

Optionally, the cross-sectional dimension of the stud decreases progressively in a direction away from the land body.

Optionally, the anti-slip structure is arranged on the side wall of the blade edge body corresponding to the groove wall of the clamping jaw groove;

and/or the bottom wall of the blade edge body corresponding to the groove bottom of the clamping jaw groove is provided with the anti-skidding structure.

In a second aspect, the present disclosure provides a drill chuck comprising a drill body and a clamping jaw as described above;

the drill body is provided with a clamping jaw inclined hole, and the clamping jaw is positioned in the clamping jaw inclined hole;

the drill body is provided with a nut, the clamping jaw body is provided with a thread which is used for being meshed with the nut in a matching mode, and the thread is located on one side, back to the other side, of the clamping jaw body, of the clamping inclined plane.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

the clamping jaw and the drill chuck of the drill chuck, through set up the clamping jaw recess on the centre gripping inclined plane, carry out cooling treatment to the clamping jaw margin that accords with the requirements such as hardness that has made, make the clamping jaw margin shrink, thereby make the entering into to the clamping jaw recess that the clamping jaw margin can be smooth and easy, treat that the clamping jaw margin cooling shrinkage state resumes the back, the interference fit can be realized with the clamping jaw recess to the clamping jaw margin, thereby make the clamping jaw margin inlay establish in the clamping jaw recess, need not to carry out hot working, also need not extra connecting pieces such as welding flux and can realize the effective fixed of clamping jaw margin in the clamping jaw recess, thereby avoided clamping jaw margin and clamping jaw body to take place the perk, thermal deformation such as distortion, and guaranteed the assembly precision of clamping jaw, and then guaranteed the normal use of clamping jaw.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a schematic view of a jaw according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of a jaw of an embodiment of the present disclosure from another perspective;

FIG. 3 is an exploded view of a jaw margin of a jaw in accordance with an embodiment of the present disclosure shown unassembled in the jaw recess;

FIG. 4 is a schematic structural view from yet another perspective of a jaw according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural view (partially in section) of a drill chuck according to an embodiment of the present disclosure;

FIG. 6 is a partial cross sectional view of a drill chuck according to an embodiment of the present disclosure;

FIG. 7 is a side view block diagram of a jaw according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural view of a drill chuck according to an embodiment of the present disclosure;

FIG. 9 is an enlarged view of the structure at I in FIG. 8;

FIG. 10 is a schematic structural view of a jaw according to an embodiment of the present disclosure before multi-point riveting;

fig. 11 is a schematic structural view illustrating a notch being riveted by using a riveting roller blade according to an embodiment of the present disclosure;

FIG. 12 is a side sectional view corresponding to FIG. 11;

FIG. 13 is a schematic structural view of a notch according to an embodiment of the present disclosure when the notch is not riveted;

fig. 14 is a schematic view illustrating a state in which a convex portion formed on a notch according to an embodiment of the present disclosure is pressed against a jaw margin;

FIG. 15 is a schematic view of a plurality of jaws and a bit shank according to an embodiment of the disclosure;

FIG. 16 is a schematic view of the bottom wall of a jaw margin embodying the present disclosure having anti-slip structure disposed thereon;

FIG. 17 is a schematic side view of a jaw margin according to an embodiment of the present disclosure with anti-slip structure on the side walls;

fig. 18 is a schematic structural view of a clamping jaw according to an embodiment of the disclosure (a clamping jaw edge is provided with an anti-slip structure).

Wherein, 100, drill chuck; 1. a clamping jaw; 11. a jaw body; 111. clamping the inclined plane; 112. a jaw recess; 113. a convex portion; 114. a thread; 115. riveting points; 12. a jaw margin; 121. a land body; 122. a clamping portion; 123. anti-skid projections; 2. a drill body; 21. a clamping jaw inclined hole; 3. a nut; 4. a nut sleeve; 5. a bushing; 6. a front cover; 7. riveting a roller cutter; 8. a drill bit shank.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

The drill chuck comprises: the drill body and the clamping jaw installed on the drill body. The clamping of drilling tools and the like is realized through the matching of a plurality of clamping jaws. The clamping jaw is provided with a thread which is matched and meshed with the nut on the drill body. The clamping jaw is provided with a clamping jaw edge, and when clamping is carried out, the clamping jaw edge is contacted with the drilling tool to clamp the drilling tool. In order to obtain a better clamping effect, the hardness and the wear resistance of a clamping jaw edge are improved by quenching the clamping jaw in the prior art, however, the processing mode belongs to hot processing, the clamping jaw is subjected to thermal deformation such as distortion and tilting, and particularly the thermal deformation of the clamping jaw edge and a thread affects the normal use of the clamping jaw.

According to the other prior art, the clamping jaw edge is manufactured firstly, the clamping jaw edge meeting the requirements on hardness and the like is manufactured, then the manufactured clamping jaw edge meeting the requirements on hardness and the like is welded on the clamping jaw body through welding agents to form the clamping jaw, but the welding also belongs to hot working, the clamping jaw can be thermally deformed in the production process, and the existence of the welding agents can influence the assembly precision of the clamping jaw edge.

Based on this, this embodiment provides a clamping jaw and drill chuck of drill chuck, need not hot-working, also need not connecting pieces such as welding flux and can realize the assembly of clamping jaw margin for the clamping jaw margin that hardness etc. meet the requirements is firm to be fixed in the clamping jaw recess.

The clamping jaw and the drill chuck are explained by the following specific embodiments:

example one

Referring to fig. 1 to 4, the present embodiment provides a clamping jaw 1 of a drill chuck, comprising: a jaw body 11 and a jaw margin 12.

The jaw body 11 has a gripping ramp 111 and threads 114 thereon. The clamping bevel 111 is located on one side of the clamping jaw body 11, and the thread 114 is located on the side of the clamping jaw body 11 opposite to the clamping bevel 111. In specific implementation, the jaw body 11 may be a cylinder, and of course, may have other shapes. The clamping ramp 111 extends obliquely with respect to the axis of the jaw body 11, i.e. the clamping ramp 111 has an angle with the axis of the jaw body 11. Wherein, a clamping jaw groove 112 is arranged on the clamping inclined plane 111. The jaw margin 12 may contract upon cooling to enter the jaw recesses 112 and to provide an interference fit with the jaw recesses 112 after the cooling contraction state has been restored.

Here, the jaw edge 12 is a jaw edge 12 having satisfactory hardness, wear resistance, and the like. Namely, a clamping jaw blade 12 with hardness and wear resistance meeting specific use requirements is manufactured by using a clamping jaw blank, and the clamping jaw blade 12 is cooled.

Specifically, the clamping jaw edge 12 with hardness and the like meeting the requirements can be placed in a cooling box with a preset cooling temperature for cooling, the preset cooling temperature can be below-100 ℃, the clamping jaw edge 12 is contracted, then the contracted clamping jaw edge 12 is placed in the clamping jaw groove 112, after the cooling contraction state of the clamping jaw edge 12 is recovered, for example, the environment where the clamping jaw 1 provided with the clamping jaw edge 12 is located at the moment is the environment when the drill chuck is used, therefore, when the cooling contraction clamping jaw edge 12 is in the environment, the temperature of the cooling contraction clamping jaw edge is gradually recovered, for example, the environment temperature is normal temperature, when the clamping jaw edge 12 is recovered to the normal temperature, the clamping jaw edge 12 is expanded and is in interference fit with the clamping jaw groove 112, and therefore effective fixation of the clamping jaw edge 12 is achieved. That is, the cooling contraction state restoration here is not to perform hot working on the jaw edge 12, but to perform restoration of the cooling contraction state thereof by heat exchange between the jaw edge 12 and the air in the environment where the jaw body 11 is located. The ambient temperature at which the cooled jaw margin 12 is placed into the jaw recesses 112 is higher than the temperature at which the jaw margin 12 is cooled.

It should be noted that, when the jaw edge 12 is contracted, the jaw edge 12 is only relatively reduced in size, and after the contracted and cooled contracted state is restored, the jaw edge 12 is not deformed such as tilted and twisted.

When placing the cooled jaw margin 12 into the jaw groove 112, the jaw margin 12 may be lowered into the jaw groove 112 from above the notch. Alternatively, the jaw margin 12 may enter the jaw recess 112 from one end of the jaw recess 112. The specific placement can be set according to the actual situation such as the shape of the jaw groove 112, and this embodiment is not limited to this.

It will be appreciated that the jaw margin 12 is of a material which is cold shrinkable and which expands after the cold shrunk state has been restored, and that the jaw margin 12 does not distort, such as by warping or twisting, during the entire process. The jaw blade 12 may be made of hard alloy, such as tungsten steel, or may be made of a metal material with a surface coated with a hardening substance, or may be made of a plurality of materials such as a hardened metal after a treatment such as carburizing and nitriding quenching, or may be made of a superhard material such as ceramic.

In addition, the shape of jaw margin 12 matches the shape of jaw recess 112, and the dimensions of jaw margin 12 after cooling recovery match the dimensions of jaw recess 112, so that jaw margin 12 can enter jaw recess 112 upon cooling contraction and can nest in jaw recess 112 after cooling recovery. The particular shape and size of the jaw margin 12 may be set according to the actual requirements such as the shape and size of the jaw recesses 112. The jaw groove 112 may be a square groove, a trapezoid groove, or a dovetail groove.

One jaw recess 112 may house one jaw edge 12, or a plurality of jaw edges 12, where the plurality is two or more. When the jaw recess 112 has a plurality of jaw margins 12 therein, the plurality of jaw margins 12 are arranged in sequence along the extending direction of the jaw recess 112, and two adjacent jaw margins 12 may be disposed at intervals.

Referring to fig. 5 to 9, the clamping jaw 1 provided in the present embodiment is specifically used in a drill chuck 100. The drill chuck 100 comprises in particular a drill body 2 and a drill shank 8. Wherein, be provided with clamping jaw inclined hole 21 on the drilling body 2, clamping jaw inclined hole 21 is a plurality of, and a plurality of clamping jaw inclined holes 21 use the axis of drilling body 2 as the central line, along the circumference equipartition of drilling body 2. A jaw 1 is fitted into a jaw angle hole 21. That is, the plurality of jaws 1 enclose a clamping space. Wherein, the drill body 2 is provided with a nut 3, and the nut 3 is matched, meshed and connected with the thread 114 on the clamping jaw 1. The nut 3 is sleeved with a nut sleeve 4, a bushing 5 is arranged outside the nut sleeve 4, and a front sleeve 6 is arranged outside the bushing 5. The nut 3 is connected with the nut sleeve 4, the front sleeve 6 is in press fit with the bushing 5, and the bushing 5 is connected with the nut sleeve 4 through a driving claw.

Referring to fig. 6 and 7, the included angle b formed by the clamping inclined plane 111 and the axis of the clamping jaw body 11 is the same as the included angle a formed by the axis of the clamping jaw inclined hole 21 on the drill body 2 and the axis of the drill body 2. The jaw margin 12 remains parallel to the clamping ramp 111. The inner hole of the nut 3 is provided with a conical thread, and the angle of the conical thread is the same as the angle a formed by the inclined hole 21 of the clamping jaw and the axis of the drill body 2.

When the front sleeve 6 is rotated, the front sleeve 6 drives the nut 3 to rotate through the bushing 5 and the nut sleeve 4, the clamping jaw 1 is driven to move back and forth in the clamping jaw inclined hole 21, and a circle formed by the enclosing of the clamping jaw blades 12 is enlarged and reduced according to the back and forth movement of the clamping jaw 1, so that drilling tools with different diameters can be clamped.

The clamping jaw 1 of the drill chuck 100 provided by the embodiment, through setting the clamping jaw groove 112 on the clamping inclined plane 111, cooling treatment is performed on the clamping jaw margin 12 meeting the requirements such as the manufactured hardness, so that the clamping jaw margin 12 contracts, thereby enabling the clamping jaw margin 12 to smoothly enter the clamping jaw groove 112, after the cooling contraction state of the clamping jaw margin 12 is recovered, the clamping jaw margin 12 can realize interference fit with the clamping jaw groove 112, thereby realizing that the clamping jaw margin 12 is embedded in the clamping jaw groove 112, without hot working, and effectively fixing the clamping jaw margin 12 in the clamping jaw groove 112 without extra connecting pieces such as welding agent, thereby avoiding the clamping jaw margin 12 and the clamping jaw body 11 from thermal deformation such as tilting and twisting, and ensuring the assembly precision of the clamping jaw 1, and further ensuring the normal use of the clamping jaw.

As shown in fig. 10-15, the notch of the jaw recess 112 has a tab 113 that can be bent toward the jaw margin 12 to press against the jaw margin 12 after the jaw margin 12 enters the jaw recess 112.

That is, after the jaw margin 12 is placed into the jaw recess 112, the notch of the jaw recess 112 is processed to form the protrusion 113, such that the protrusion 113 is pressed against the jaw margin 12, thereby further ensuring a secure engagement of the jaw margin 12 with the jaw body 11. Specifically, after the jaw margin 12 has been interference fitted into the jaw recess 112, the notch is then treated to form a protrusion 113 that bears against the jaw margin 12.

In some embodiments, the two side notches of jaw recess 112 have a protrusion 113, which may further provide a stop effect on jaw margin 12. Of course, in other embodiments, it is also possible to have only one side of the jaw recesses 112 with this projection 113.

Referring to fig. 10, 13 and 14, in some embodiments, the protrusions 113 are formed by riveting the notches at multiple points. Specifically, the notch has a plurality of riveting points 115, and at least part of the notch is bent toward the jaw blade 12 by riveting the plurality of riveting points 115 to form the convex portion 113.

Referring to fig. 11 to 14, in other embodiments, the convex portion 113 may be formed by roll-riveting the notch. Particularly, the roll riveting can be performed on the notch through the riveting roll knife 7. The projections 113 are conveniently formed by forming the projections by caulking.

It should be noted that, since the screw thread 114 and the jaw margin 12 play a main role when the drilling tool is clamped by the jaws, when the notch is processed to form the convex portion 113, that is, deformation of the notch by riveting and bending does not affect the clamping, and the convex portion can make the jaw margin 12 more stable, so that the clamping is more reliable.

Wherein, the clamping jaw cutting edge 12 specifically includes: a blade edge body 121 and a clamping portion 122 provided on the side of the blade edge body 121 facing the outside of the notch. At least a part of the clamping portion 122 is located outside the notch, and when a drill or the like is clamped by the clamping jaw 1, the clamping portion 122 is in direct contact with the drill.

Referring to fig. 16-18, further, at least part of the surface of the margin body 121 that mates with the jaw groove 112 has an anti-slip structure. The close fit between the jaw margin 12 and the jaw recess 112 may be further enhanced by providing anti-slip features.

When specifically implemented, the anti-skid structure may include: a plurality of studs 123 spaced along the surface of the margin body 121, the studs 123 projecting in a direction away from the margin body 121. Preferably, the cross-sectional dimension of the stud 123 decreases in a direction away from the land body 121. Referring to fig. 16 and 17, the anti-slip protrusions 123 may be formed as trapezoidal protrusions, which are provided to improve anti-slip effect.

Referring to fig. 16, an anti-slip structure may be provided on the bottom wall of the margin body 121 corresponding to the groove bottom of the jaw groove 112. Referring to fig. 17, an anti-slip structure may also be provided on the side wall of the margin body 121 corresponding to the groove wall of the jaw groove 112. Alternatively, the side wall and the bottom wall of the blade edge body 121 are both provided with anti-slip structures. In addition, when the side walls of the blade body 121 are provided with the anti-slip structures, the anti-slip structures may be provided on both side walls of the blade body 121, or may be provided on only one of the side walls.

Example two

Referring to fig. 1 to 18, the present embodiment provides a drill chuck 100, and the drill chuck 100 may be a self-locking drill chuck or a manual locking drill chuck, for example.

The drill chuck 100 of the embodiment comprises a drill body 2, wherein the drill body 2 is provided with a plurality of clamping jaw inclined holes 21, and the plurality of clamping jaw inclined holes 21 are uniformly distributed along the circumferential direction of the drill body 2 by taking the axis of the drill body 2 as a central line. A jaw 1 is fitted into a jaw angle hole 21. That is, the plurality of jaws 1 enclose a clamping space.

Wherein, the drill body 2 is provided with a nut 3, and the nut 3 is in matching engagement connection with the thread 114 on the clamping jaw 1. The nut 3 is sleeved with a nut sleeve 4, a bushing 5 is arranged outside the nut sleeve 4, and a front sleeve 6 is arranged outside the bushing 5. The nut 3 is connected with the nut sleeve 4, the front sleeve 6 is in press fit with the bushing 5, and the bushing 5 is connected with the nut sleeve 4 through a driving claw.

When the front sleeve 6 is rotated, the front sleeve 6 drives the nut 3 to rotate through the bushing 5 and the nut sleeve 4, the clamping jaw 1 is driven to move back and forth in the clamping jaw inclined hole 21, and a circle formed by the enclosing of the clamping jaw blades 12 is enlarged and reduced according to the back and forth movement of the clamping jaw 1, so that drilling tools with different diameters can be clamped.

The clamping jaw margin 12 is the clamping jaw margin 12 with hardness and the like meeting requirements, so that the clamping effect of the drill chuck on the drilling tool is improved.

The structure of the clamping jaw 1 in this embodiment is the same as that of the clamping jaw 1 provided in the first embodiment, and the same or similar technical effects can be brought about, which is not described herein again, and specific features and other related features of the clamping jaw 1 can be referred to the description of the first embodiment.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The clamping jaw of the drill chuck is characterized by comprising a clamping jaw body (11) and a clamping jaw margin (12), wherein one side of the clamping jaw body (11) is provided with a clamping inclined plane (111), the clamping inclined plane (111) extends obliquely relative to the axis of the clamping jaw body (11), and a clamping jaw groove (112) is formed in the clamping inclined plane (111); the jaw margin (12) is retractable upon cooling into the jaw recess (112) and is an interference fit with the jaw recess (112) upon restoration of the cool retracted state.

2. A jaw of a drill chuck according to claim 1, characterized in that the notch of the jaw recess (112) has a bulge (113) which is bendable in the direction of the jaw margin (12) to press against the jaw margin (12) after the jaw margin (12) has entered the jaw recess (112).

3. A jaw of a drill chuck according to claim 2, characterized in that the two side notches of the jaw recess (112) each have the raised portion (113).

4. A jaw of a drill chuck according to claim 2, wherein the raised portion (113) is formed by multi-point riveting of the notch.

5. A jaw of a drill chuck according to claim 2, wherein the raised portion (113) is formed by roll staking the notch.

6. A jaw of a drill chuck according to any one of claims 1 to 5, characterized in that the jaw margin (12) comprises a margin body (121) and a grip portion (122) provided on a side of the margin body (121) facing out of the notch of the jaw groove (112);

at least part of the surface of the blade edge body (121) which is matched with the clamping jaw groove (112) is provided with an anti-slip structure.

7. A clamping jaw of a drill chuck according to claim 6, characterized in that the anti-slip structure comprises a plurality of anti-slip protrusions (123) arranged at intervals along the surface of the margin body (121), the anti-slip protrusions (123) protruding away from the margin body (121).

8. A jaw of a drill chuck according to claim 7, characterized in that the cross-sectional dimension of the anti-slip projection (123) is gradually decreasing in a direction away from the margin body (121).

9. The clamping jaw of the drill chuck as claimed in claim 6, characterized in that the anti-slip structure is provided on the side wall of the margin body (121) corresponding to the groove wall of the clamping jaw groove (112);

and/or the bottom wall of the blade edge body (121) corresponding to the groove bottom of the clamping jaw groove (112) is provided with the anti-skidding structure.

10. A drill chuck, characterized by comprising a drill body (2) and a holding jaw according to any one of claims 1 to 9;

a clamping jaw inclined hole (21) is formed in the drill body (2), and the clamping jaw is located in the clamping jaw inclined hole (21);

the drill body (2) is provided with a nut (3), the clamping jaw body (11) is provided with a thread (114) which is used for being matched and meshed with the nut (3), and the thread (114) is positioned on one side, back to the other side, of the clamping jaw body (11) and the clamping inclined plane (111).

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