Drill chuck

Abstract

The utility model relates to the technical field of drill chuck structures, in particular to a drill chuck, which is provided with a drill body, a clamping jaw and a nut, and is characterized in that a rotary sleeve and a movable sleeve are respectively sleeved on the outer side of the drill body, the rotary sleeve is fixedly connected with the nut, the movable sleeve is sleeved on the drill body and axially moves on the drill body, and the movable sleeve is fixedly connected with the nut. The contact surface of the moving sleeve or the contact surface of the rotating sleeve between the moving sleeve and the rotating sleeve is a friction surface, the moving sleeve and the rotating sleeve stop rotating under the action of friction force of the friction surface after being in contact, and the chuck has the advantages of being simple in structure, low in cost, good in clamping effect, capable of prolonging the service life of the chuck and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of drill chuck structures, in particular to a drill chuck. Background Art

[0002] As is well known, when a drill chuck is connected to a drive tool shaft during machining, the inertial force of the nut during the start and stop of the drive tool can easily cause the drill chuck jaws to tighten or loosen excessively. Existing techniques involve incorporating a locking structure into the drill chuck, but this requires high manufacturing process requirements and is costly.

[0003] Patent No. 2014203142419, patent name is self-locking drill chuck. In order to increase the reliability of the clamping of the jaws, axial teeth are respectively provided between the front end of the rear sleeve and the rear end of the front sleeve. The locking between the front sleeve and the rear sleeve is achieved by the meshing and locking of the axial teeth. However, since the clamping position of the nut on the jaws is fixed, excessive clamping will lead to a reduced life of the drill body, and loose clamping will lead to poor clamping effect. Therefore, the teeth between the front end of the rear sleeve and the rear end of the front sleeve must be locked at the clamping position of the nut on the jaws, which requires very high processing precision of the axial teeth and high cost. Once the processing precision does not meet the requirements, the axial teeth of the rear sleeve and the axial teeth of the front sleeve will be docked and unable to mesh. Once meshed, there will be problems of excessive clamping of the nut or loose clamping of the nut. Summary of the Invention

[0004] The purpose of the utility model is to solve the above-mentioned deficiencies in the prior art and to provide a drill chuck with a simple structure, low cost, good clamping effect and extended service life of the chuck.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A drill chuck is provided with a drill body, a clamping jaw and a nut, and is characterized in that a rotating sleeve and a movable sleeve are respectively sleeved on the outer side of the drill body, the rotating sleeve is fixedly connected to the nut, the movable sleeve is sleeved on the drill body and is circumferentially limited and axially movable on the drill body, the contact surface of the movable sleeve or the contact surface of the rotating sleeve between the movable sleeve and the rotating sleeve is set as a friction surface, and after the movable sleeve and the rotating sleeve come into contact, the friction force of the friction surface acts to stop the rotation.

[0007] The friction surface described in the present invention is a friction brake body or friction protrusion that increases the friction force between the movable sleeve and the rotating sleeve in the relative rotation direction. The friction brake body or friction protrusion is arranged on the contact surface of the movable sleeve or the contact surface of the rotating sleeve or the contact surface of the movable sleeve and the contact surface of the rotating sleeve.

[0008] The friction surface of the utility model is one or more of rubber, resin-based, silica gel or polymer plastic.

[0009] The drill body or a component separated from the drill body and fixedly connected to the present invention is provided with a rotation limiting part, and the movable sleeve is provided with a rotation-stopping part cooperating with the rotation limiting part. The rotation limiting part and the rotation-stopping part of the movable sleeve are circumferentially limited and axially slidably connected.

[0010] The inner wall of the movable sleeve of the utility model is provided with a docking groove for the movable sleeve and the rotating sleeve contact surface to be in a docking state, and an avoidance groove for the movable sleeve and the rotating sleeve contact surface to be in a disengaged state. The circumference of the drill body is provided with a clamping groove that cooperates with the docking groove or the avoidance groove. A clamping protrusion is inserted into the clamping groove, and the position of the movable sleeve is achieved by clamping the clamping protrusion into the docking groove or the avoidance groove.

[0011] The drill body of the utility model is provided with a docking groove for the contact surfaces of the movable sleeve and the rotating sleeve to be in a docking state, and an avoidance groove for the contact surfaces of the movable sleeve and the rotating sleeve to be in a disengaged state on the circumference thereof; the inner wall of the movable sleeve is provided with a clamping groove that cooperates with the docking groove or the avoidance groove; a clamping protrusion is inserted into the clamping groove, and the position of the movable sleeve is achieved by clamping the clamping protrusion into the docking groove or the avoidance groove.

[0012] The movable sleeve of the utility model is arranged on the rear side of the rotating sleeve or the movable sleeve is arranged on the front side of the rotating sleeve. The movable sleeve and the drill body or the component separated from the drill body and fixedly connected are circumferentially limited and axially slidably connected.

[0013] The movable sleeve described in the utility model is arranged on the rear side of the rotating sleeve, and a friction brake body is provided on the contact surface of the movable sleeve. The friction brake body is an elastic rubber layer, and a friction protrusion is provided on the contact surface of the rotating sleeve. A rotation limiting part is provided on the drill body or a component separated from the drill body and fixedly connected to the drill body, and a rotation-stopping part cooperating with the rotation limiting part is provided on the movable sleeve. The rotation limiting part and the rotation-stopping part of the movable sleeve are axially slidably connected. A docking groove for the movable sleeve and the rotating sleeve contact surface to be in a docking state and an avoidance groove for the movable sleeve and the rotating sleeve contact surface to be disengaged are provided on the circumference of the upper rear part of the drill body. A clamping groove cooperating with the docking groove or the avoidance groove is provided on the inner wall of the movable sleeve. A clamping protrusion is inserted into the clamping groove, and the position positioning of the movable sleeve is achieved by clamping the clamping protrusion into the docking groove or the avoidance groove.

[0014] The movable sleeve of the utility model is arranged on the front side of the rotating sleeve, and the contact surface of the movable sleeve 5 is provided with a friction brake body, and the friction brake body is an elastic rubber layer, and a rotation limit part is provided on the component that is separated and fixedly connected with the drill body, and the movable sleeve is provided with a stopper that cooperates with the rotation limit part, and the rotation limit part is axially slidably connected with the stopper of the movable sleeve. The component that is separated and fixedly connected with the drill body is the front cover, and the rotation limit part is a card slot provided at the rear end of the front cover, and the stopper is a card block that cooperates with the card slot on the movable sleeve, and the rear end of the front cover is inserted into the interior of the movable sleeve and cooperates with the card block in circumferential clamping. The circumferential direction of the drill body is provided with a docking groove for the contact surface of the movable sleeve and the avoidance groove for the contact surface of the movable sleeve and the rotating sleeve to be separated. The inner wall of the movable sleeve is provided with a clamping groove that cooperates with the docking groove or the avoidance groove, and a clamping protrusion is inserted into the clamping groove, and the position positioning of the movable sleeve is achieved by the clamping protrusion being clamped into the docking groove or the avoidance groove.

[0015] The inner circumference of the component separated from the drill body and fixedly connected to the drill body of the utility model is connected to the drill body by interference fit, and the outer circumference of the component separated from the drill body and fixedly connected to the drill body is provided with a rotation limiting portion.

[0016] Due to the adoption of the structure, the utility model has the advantages of simple structure, low cost, good clamping effect, extended service life of the clamp, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of embodiment 1 of the present invention.

[0018] Figure 2 This is an exploded view of Example 1.

[0019] Figure 3 yes Figure 1 Schematic diagram of the structure of the rotating sleeve.

[0020] Figure 4 yes Figure 1 Schematic diagram of the structure of the moving sleeve.

[0021] Figure 5 yes Figure 1 Schematic diagram of the structure of the drill body.

[0022] Figure 6 It is a structural diagram of the components that are separate from and fixedly connected to the drill body in Example 1.

[0023] Figure 7 It is a cross-sectional view of embodiment 2 of the present invention.

[0024] Figure 8 This is an exploded view of Example 2.

[0025] Figure 9 yes Figure 7 Schematic diagram of the structure of the moving sleeve.

[0026] Figure 10 yes Figure 7 Schematic diagram of the middle front cover mechanism. DETAILED DESCRIPTION

[0027] The present invention is further described below with reference to the accompanying drawings:

[0028] As shown in the accompanying drawings, a drill chuck is provided with a drill body 1, a clamping jaw 2, and a nut 3, characterized in that a rotating sleeve 4 and a movable sleeve 5 are respectively sleeved on the outer side of the drill body 1, the rotating sleeve 4 is fixedly connected to the nut 3, the movable sleeve 5 is sleeved on the drill body 1 and moves axially on the drill body 1, and the contact surface of the movable sleeve 5 or the contact surface of the rotating sleeve 4 between the movable sleeve 5 and the rotating sleeve 4 is set as a friction surface. After the movable sleeve 5 and the rotating sleeve 4 come into contact, they are stopped by the friction force of the friction surface.

[0029] The friction surface mentioned above may be not only a flat surface that can increase the friction force but also a non-flat surface (concave-convex surface) that can increase the friction force.

[0030] Furthermore, the friction surface is a friction brake body or friction protrusion that increases the friction force between the movable sleeve 5 and the rotating sleeve 4 in the relative rotation direction. The friction brake body or friction protrusion is arranged on the contact surface of the movable sleeve 5 or the contact surface of the rotating sleeve 4 or the contact surface of the movable sleeve 5 and the contact surface of the rotating sleeve 4.

[0031] Furthermore, the friction surface is one or more of rubber, resin-based, silicone or polymer plastic.

[0032] Furthermore, a rotation limiting portion 6 is provided on the drill body 1 or on a component 7 that is separated from the drill body and fixedly connected, and a rotation-stopping portion 8 that cooperates with the rotation limiting portion 6 is provided on the movable sleeve 5. The rotation limiting portion 6 is axially slidably connected to the rotation-stopping portion 8 of the movable sleeve 5.

[0033] Furthermore, a docking groove 9 for the contact surfaces of the movable sleeve 5 and the rotating sleeve 4 to be in a docking state and an avoidance groove 10 for the contact surfaces of the movable sleeve 5 and the rotating sleeve 4 to be in a disengaged state are provided on the inner wall of the movable sleeve 5. A snap-fitting groove cooperating with the docking groove 9 or the avoidance groove 10 is provided on the circumference of the drill body 1, and a snap-fitting protrusion 11 is inserted into the snap-fitting groove. The position of the movable sleeve 5 is achieved by snapping the snap-fitting protrusion 11 into the docking groove 9 or the avoidance groove 10.

[0034] Furthermore, a docking groove 9 for the contact surfaces of the movable sleeve 5 and the rotating sleeve 4 to be in a docking state and an avoidance groove 10 for the contact surfaces of the movable sleeve 5 and the rotating sleeve 4 to be in a disengaged state are provided on the circumference of the drill body 1. A snap-fitting groove cooperating with the docking groove or the avoidance groove 10 is provided on the inner wall of the movable sleeve 5, and a snap-fitting protrusion 11 is inserted into the snap-fitting groove. The position of the movable sleeve 5 is achieved by snapping the snap-fitting protrusion 11 into the docking groove 9 or the avoidance groove 10.

[0035] Furthermore, the movable sleeve 5 is arranged at the rear side of the rotating sleeve 4 or the movable sleeve 5 is arranged at the front side of the rotating sleeve 4, and the movable sleeve 5 is axially slidably connected to the drill body 1 or the component 7 separated from the drill body and fixedly connected.

[0036] Furthermore, the movable sleeve 5 is arranged on the rear side of the rotating sleeve 4, and a friction brake body is provided on the contact surface of the movable sleeve 5, which is an elastic rubber layer 12. A friction protrusion 13 is provided on the contact surface of the rotating sleeve 4, and a rotation limit part 6 is provided on the drill body 1 or on a component 7 that is separated from the drill body and fixedly connected to the drill body. The movable sleeve 5 is provided with a stop part 8 that cooperates with the rotation limit part, and the rotation limit part 6 is axially slidably connected to the stop part 8 of the movable sleeve 5. A docking groove 9 for the contact surface of the movable sleeve 5 and the rotating sleeve 4 is provided on the circumference of the rear part of the drill body 1 for the contact surface of the movable sleeve 5 and the rotating sleeve 4 to be in a docking state and an avoidance groove 10 for the contact surface of the movable sleeve 5 and the rotating sleeve 4 to be disengaged. A clamping groove 15 that cooperates with the docking groove 9 or the avoidance groove 10 is provided on the inner wall of the movable sleeve 5, and a clamping protrusion 11 is inserted into the clamping groove 15. The position positioning of the movable sleeve 5 is achieved by clamping the clamping protrusion 11 into the docking groove 9 or the avoidance groove 10.

[0037] Furthermore, the movable sleeve 5 is provided on the front side of the rotating sleeve, and a friction brake body is provided on the contact surface of the movable sleeve 5. The friction brake body is an elastic rubber layer 12. A rotation limiter 6 is provided on the component 7 that is separated from the drill body and fixedly connected thereto. The movable sleeve 5 is provided with a rotation-stopping portion 8 that cooperates with the rotation limiter 6. The rotation limiter 6 is axially slidably connected to the rotation-stopping portion 8 of the movable sleeve 5. The component 7 that is separated from the drill body and fixedly connected thereto is a front cover, and the rotation limiter 6 is a card slot provided at the rear end of the front cover. The rotation-stopping portion 8 is a movable sleeve. 5 and a card block that cooperates with the card slot, the rear end of the front cover is inserted into the interior of the movable sleeve 5 and cooperates with the card block in a circumferential manner, and the circumferential direction of the drill body 1 is provided with a docking groove 9 for the movable sleeve 5 and the rotating sleeve 4 contact surface to be in a docking state and an avoidance groove 10 for the movable sleeve and the rotating sleeve contact surface to be disengaged. The inner wall of the movable sleeve 5 is provided with a card groove 15 that cooperates with the docking groove 9 or the avoidance groove 10, and a card protrusion 11 is inserted into the card groove 15. The position positioning of the movable sleeve is achieved by snapping the card protrusion 11 into the docking groove 9 or the avoidance groove 10.

[0038] Furthermore, the inner circumference of the component 7 that is separate from the drill body and fixedly connected is connected to the drill body 1 by interference fit, and the outer circumference of the component 7 that is separate from the drill body and fixedly connected is provided with a rotation limiter 6.

[0039] After the rotating sleeve 4 and the movable sleeve 5 are docked, the friction force in the rotation direction between the rotating sleeve 4 and the movable sleeve 5 is increased, thereby reducing the influence of the inertia force of the drill chuck during use, and preventing the rotating sleeve 4 and the movable sleeve 5 from rotating. Therefore, it can prevent the rotating sleeve 4 from over-tightening or loosening the clamping force between the nut 3 and the clamping jaw 2. Due to the adoption of the above structure, the invention has the advantages of simple structure, low cost, good clamping effect, and extended chuck service life.

[0040] Example 1

[0041] Figure 1 and Figure 2 The drill chuck is shown in FIG1 , which comprises a drill body 1, a clamping jaw 2 and a nut 3. The front end of the clamping jaw 2 passes through the front end of the clamping jaw hole of the drill body 1, and the rear end of the clamping jaw 2 passes through the rear end of the clamping jaw hole and is connected to the nut 3 by a thread. The outer side of the drill body 1 is provided with a rotating sleeve 4 and a movable sleeve 5. The rotating sleeve 4 is fixedly connected to the nut 3. The movable sleeve 5 is provided on the rear side of the rotating sleeve 4. The movable sleeve 5 is sleeved on the drill body 1 and moves axially on the drill body 1. The contact surface of the movable sleeve 5 or the contact surface of the rotating sleeve 4 between the movable sleeve 5 and the rotating sleeve 4 is set as a friction surface. After the movable sleeve 5 and the rotating sleeve 4 contact, they stop rotating due to the friction force of the friction surface. The friction surface is a friction brake body or a friction protrusion that increases the friction force in the relative rotation direction between the movable sleeve 5 and the rotating sleeve 4. The friction brake body or the friction protrusion are respectively provided on the contact surface of the movable sleeve 5 and the contact surface of the rotating sleeve 4.

[0042] Figure 3 The movable sleeve 5 has a friction brake body on its contact surface. The friction brake body is an elastic rubber layer 12. Figure 2 The figure shows a rotating sleeve 4, on the contact surface of which a friction protrusion 13 is provided. By inserting the elastic rubber layer 12 through the friction protrusion 13, the drill body 1 can better achieve a tighter bonding force between the rotating sleeve 4 and the movable sleeve 5 during operation, thereby avoiding the rotation between the rotating sleeve 4 and the movable sleeve 5 caused by the action of inertia force.

[0043] The drill body 1 or the component 7 that is separated from the drill body and fixedly connected is provided with a rotation limiting portion 6, and the movable sleeve 5 is provided with a rotation-stopping portion 8 that cooperates with the rotation limiting portion 6. The rotation limiting portion 6 is axially slidably connected to the rotation-stopping portion 8 of the movable sleeve 5. Therefore, there are two situations for the position of the rotation-limiting portion of this embodiment. In the first situation, the rotation limiting portion 6 is directly provided on the drill body 1 ( Figure 5 As shown), in the second case, the rotation limiter 6 is provided on a component 7 which is separate from the drill body and fixedly connected thereto ( Figure 6 As shown), the inner circumferential surface of the component is connected to the drill body 1 by interference fit, and a rotation limiting portion 6 is provided on the outer circumferential surface of the component.

[0044] The circumference of the drill body 1 is provided with a docking groove 9 for the contact surface of the movable sleeve 5 and the rotating sleeve 4 to be in a docking state, and an avoidance groove 10 for the contact surface of the movable sleeve 5 and the rotating sleeve 4 to be separated. The inner wall of the movable sleeve 5 is provided with a clamping groove that cooperates with the docking groove or the avoidance groove 10. The clamping protrusion 11 is inserted into the clamping groove. The position of the movable sleeve 5 is achieved by clamping the clamping protrusion 11 into the docking groove 9 or the avoidance groove 10. The clamping protrusion 11 is a first clamping spring ( Figure 1 shown).

[0045] The circumference of the drill body 1 extending from the rear end of the movable sleeve 5 is connected to the second retaining spring 14 to prevent the movable sleeve 5 from falling out, or an avoidance groove 10 is provided on the drill body outside the movable sleeve, and the second retaining spring 14 is connected to the avoidance groove.

[0046] When the above scheme is in use, the engaging protrusion 11 is engaged with the docking groove 9 in the first position, and the engaging protrusion 11 is engaged with the avoidance groove 10 in the second position. When the movable sleeve 5 runs to the first position, the movable sleeve 5 contacts the rotating sleeve 4, and the protruding structure 13 on the rotating sleeve 4 is inserted into the elastic rubber layer 12 of the friction brake body of the movable sleeve 5. The friction between the two reduces the influence of the inertia force during the use of the drill chuck, and no relative rotation occurs. Therefore, no rotation occurs between the nut 3 and the clamping jaw 2, and the clamping jaw 2 does not tighten or loosen the tool. When the movable sleeve 5 runs to the second position, the movable sleeve 5 and the rotating sleeve 4 are separated. At this time, the rotating sleeve 4 can be rotated to clamp or release the tool of the drill chuck.

[0047] Example 2

[0048] Figure 7 and Figure 8 The cam 3 is a kind of cam 3 that is used for rotating the drill body 1, and the cam 3 is a kind of cam 3 that is used for rotating the drill body 1. As shown in FIG, a drill chuck is provided with a drill body 1, a clamping jaw 2 and a nut 3. The front end of the clamping jaw 2 passes through the front end of the clamping jaw hole of the drill body 1, and the rear end of the clamping jaw 2 passes through the rear end of the clamping jaw hole and is connected to the nut 3 by a thread. The outer side of the drill body 1 is provided with a rotating sleeve 4 and a movable sleeve 5. The rotating sleeve 4 is fixedly connected to the nut 3. The movable sleeve 5 is provided on the front side of the rotating sleeve 4. The movable sleeve 5 is sleeved on the drill body 1 and moves axially on the drill body 1. The contact surface of the movable sleeve 5 or the contact surface of the rotating sleeve 4 between the movable sleeve 5 and the rotating sleeve 4 is set as a friction surface. After the movable sleeve 5 and the rotating sleeve 4 contact, the friction force of the friction surface stops the rotation. The friction surface is a friction brake body that increases the friction force in the relative rotation direction between the movable sleeve 5 and the rotating sleeve 4. The friction brake body is provided on the contact surface of the movable sleeve 5 or the contact surface of the rotating sleeve 4 or the contact surface of the movable sleeve 5 and the contact surface of the rotating sleeve 4.

[0049] Figure 9The movable sleeve 5 has a friction brake body on its contact surface, which is an elastic rubber layer 12. The movable sleeve 5 moves upward and contacts the lower end of the rotating sleeve 4. The lower end of the rotating sleeve 4 squeezes the friction brake body of the movable sleeve 5, which can better achieve a tighter bonding force between the rotating sleeve 4 and the movable sleeve 5 during the operation of the drill body 1, avoiding the rotation between the rotating sleeve 4 and the movable sleeve 5 caused by the inertial force.

[0050] The drill body 1 or the component 7 that is separated from the drill body and fixedly connected is provided with a rotation limiting portion 6, and the movable sleeve 5 is provided with a rotation-stopping portion 8 that cooperates with the rotation limiting portion 6. The rotation limiting portion 6 is axially slidably connected to the rotation-stopping portion 8 of the movable sleeve 5. The rotation limiting portion 6 of this embodiment is provided on the component 7 that is separated from the drill body and fixedly connected. The component 7 that is separated from the drill body and fixedly connected is a front cover ( Figure 10 As shown), the rotation limiting portion 6 is a slot provided at the rear end of the front cover, and the rotation stop portion 8 is Figure 9 The block on the movable sleeve 5 shown matches the slot, the inner circular surface of the front cover is interference-fitted with the lower end of the drill body 1, and the rear end of the front cover is inserted into the movable sleeve 5 and circumferentially engaged with the block.

[0051] The drill body 1 is provided with a docking groove 9 for the contact surface of the movable sleeve 5 and the rotating sleeve 4 in the circumferential direction, and an avoidance groove 10 for the contact surface of the movable sleeve 5 and the rotating sleeve 4 to be separated. The inner wall of the movable sleeve 5 is provided with a clamping groove 15 that cooperates with the docking groove or the avoidance groove 10. The clamping protrusion 11 is inserted into the clamping groove 15. The position of the movable sleeve 5 is achieved by clamping the clamping protrusion 11 into the docking groove 9 or the avoidance groove 10. The clamping protrusion 11 is a first clamping spring ( Figure 7 shown).

[0052] When the above scheme is in use, the snap-in protrusion 11 is snapped into the docking groove 9 in the first position, and the snap-in protrusion 11 is snapped into the avoidance groove 10 in the second position. When the movable sleeve 5 moves to the first position, the movable sleeve 5 contacts the rotating sleeve 4. The friction between the two reduces the influence of the inertial force during the use of the drill chuck, and no relative rotation occurs. Therefore, no rotation occurs between the nut 3 and the clamping jaw 2, and the clamping jaw 2 does not tighten or loosen the tool. When the movable sleeve 5 moves to the second position, the movable sleeve 5 and the rotating sleeve 4 are separated. At this time, the rotating sleeve 4 can be rotated to clamp or release the drill chuck. Optionally, a friction surface is provided on the contact surface between the contact surface of the movable sleeve 5 and the rotating sleeve 4, and the friction surface is one or more of rubber, resin-based, silicone or polymer plastic.

[0053] Therefore, it can be seen from the above embodiments that the present patent provides a friction surface on the contact surface of the movable sleeve 5 or the contact surface between the rotating sleeve 4 to avoid the rotation problem of the rotating sleeve 4 caused by the inertia force during the operation of the drill body 1, and can better tighten the tool with the jaws 2 of the drill chuck, avoiding excessive tightening or loosening of the jaws 2.

Claims

1. A drill chuck, comprising a drill body, a clamping jaw, and a nut, characterized in that The outer sides of the drill body are respectively covered with a rotating sleeve and a movable sleeve, the rotating sleeve is fixedly connected to the nut, the movable sleeve is covered on the drill body and is circumferentially limited and axially movable on the drill body, and the contact surface of the movable sleeve or the contact surface of the rotating sleeve that contacts the movable sleeve is set as a friction surface. After the movable sleeve and the rotating sleeve contact, the friction force of the friction surface stops the rotation.

2. A drill chuck according to claim 1, characterized in that The friction surface is a friction brake body or friction protrusion that increases the friction force between the movable sleeve and the rotating sleeve in the relative rotation direction. The friction brake body or friction protrusion is arranged on the contact surface of the movable sleeve or the contact surface of the rotating sleeve or the contact surface of the movable sleeve and the rotating sleeve.

3. A drill chuck according to claim 1 or 2, characterized in that The friction surface is made of one or more materials selected from rubber, resin-based, silicone or polymer plastic.

4. A drill chuck according to claim 1, characterized in that A rotation limiting part is provided on the drill body or on a component separated from the drill body and fixedly connected thereto, and a rotation-stopping part cooperating with the rotation limiting part is provided on the movable sleeve. The rotation limiting part and the rotation-stopping part of the movable sleeve are circumferentially limited and axially slidably connected.

5. A drill chuck according to claim 3, characterized in that The inner wall of the movable sleeve is provided with a docking groove for the movable sleeve and the rotating sleeve contact surface to be in a docking state, and an avoidance groove for the movable sleeve and the rotating sleeve contact surface to be in a disengaged state. The circumference of the drill body is provided with a clamping groove that cooperates with the docking groove or the avoidance groove. The clamping protrusion is inserted into the clamping groove, and the position of the movable sleeve is achieved by clamping the clamping protrusion into the docking groove or the avoidance groove.

6. A drill chuck according to claim 3, characterized in that The circumference of the drill body is provided with a docking groove for the contact surfaces of the movable sleeve and the rotating sleeve to be in a docking state, and an avoidance groove for the contact surfaces of the movable sleeve and the rotating sleeve to be in a disengaged state. The inner wall of the movable sleeve is provided with a clamping groove that cooperates with the docking groove or the avoidance groove. The clamping protrusion is inserted into the clamping groove, and the position of the movable sleeve is achieved by clamping the clamping protrusion into the docking groove or the avoidance groove.

7. A drill chuck according to claim 1, characterized in that The movable sleeve is arranged on the rear side of the rotating sleeve or the movable sleeve is arranged on the front side of the rotating sleeve. The movable sleeve and the drill body or the component separated from the drill body and fixedly connected are circumferentially limited and axially slidably connected.

8. A drill chuck according to claim 7, characterized in that The movable sleeve is arranged on the rear side of the rotating sleeve, and a friction brake body is provided on the contact surface of the movable sleeve, which is an elastic rubber layer. A friction protrusion is provided on the contact surface of the rotating sleeve. A rotation limit part is provided on the drill body or a component separated from the drill body and fixedly connected to the drill body, and a stop part cooperating with the rotation limit part is provided on the movable sleeve. The rotation limit part and the stop part of the movable sleeve are axially slidably connected. A docking groove for the movable sleeve and the rotating sleeve contact surface to be in a docking state and an avoidance groove for the movable sleeve and the rotating sleeve contact surface to be disengaged are provided on the circumference of the upper rear part of the drill body. A clamping groove cooperating with the docking groove or the avoidance groove is provided on the inner wall of the movable sleeve. A clamping protrusion is inserted into the clamping groove, and the position positioning of the movable sleeve is achieved by clamping the clamping protrusion into the docking groove or the avoidance groove.

9. A drill chuck according to claim 7, characterized in that The movable sleeve is provided with a front cover, and the rotation limiting part is a card slot provided at the rear end of the front cover, and the stop part is a card block on the movable sleeve that cooperates with the card slot, and the rear end of the front cover is inserted into the movable sleeve and circumferentially engages with the card block. The circumferential direction of the drill body is provided with a docking groove for the movable sleeve and the rotating sleeve contact surface to be engaged with the rotating sleeve and an avoidance groove for the movable sleeve and the rotating sleeve contact surface to be disengaged. The inner wall of the movable sleeve is provided with a clamping groove that cooperates with the docking groove or the avoidance groove, and a clamping protrusion is inserted into the clamping groove, and the position positioning of the movable sleeve is achieved by the clamping protrusion being engaged with the docking groove or the avoidance groove.

10. A drill chuck according to claim 8 or 9, characterized in that The inner circumference of the component that is separate from and fixedly connected to the drill body is connected to the drill body through interference fit, and the outer circumference of the component that is separate from and fixedly connected to the drill body is provided with a rotation limiting portion.

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