Hand-tight drill chuck

Abstract

The utility model provides a hand-tight drill chuck which is provided with a positioned inner supporting ring, the inner supporting ring comprises a first ring-shaped base body, the first ring-shaped base body is arranged outside a drill body in a sleeved mode, an inner supporting piece is arranged on the first ring-shaped base body, the inner supporting piece is provided with an outer side face facing the inner wall of a rotary sleeve, and the outer side face is provided with an outer side face facing the inner wall of the rotary sleeve. An extrusion structure is arranged between the nut and the step, and in the rotating work of the hand-tight drill chuck, the inner supporting sheets are pushed and extruded to the radial outer side to be elastically deformed and opened so as to be tightly extruded with the inner wall of the rotating sleeve; the hand-tight drill chuck is provided with a flexible filling layer, the flexible filling layer is located between the outer side face of the inner supporting piece and the inner wall of the rotary sleeve, and when the inner supporting piece elastically deforms and expands towards the radial outer side and is in squeezing fit with the inner wall of the rotary sleeve, the gap between the outer side face and the inner wall of the rotary sleeve is filled with the flexible filling layer, and the friction area is increased. According to the utility model, better inertia self-loosening prevention performance can be provided, and the rotating sleeve can be protected.

Description

Technical Field

[0001] The utility model relates to a drill chuck, in particular to a hand-tightened drill chuck. Background Art

[0002] A hand-tight drill chuck comprises a drill body, jaws, a nut, and a rotating sleeve. The nut and jaws are threaded together, and the rotating sleeve and nut are connected directly or via a connecting structure. Manually operating the rotating sleeve and rotating the nut moves the jaws forward or backward, tightening or loosening the drill bit. Some hand-tight drill chucks also feature a locking mechanism. This mechanism typically consists of a gear ring fixed to the drill body and a spring clip connected to the nut. The spring clip is located radially outward of the gear ring and is locked by the rotating sleeve.

[0003] With the development of lithium battery technology, electric drills are spinning at ever-increasing speeds. When drilling, the moment the drill comes to a stop from a high speed, inertia is generated. This can cause the drill chuck to loosen due to the sudden stop of the drill. This inertia causes the rotating sleeve to unlock, causing the nut to rotate in the direction of opening the drill chuck jaws, loosening the drill bit. Even with a locking mechanism, the current lithium battery technology can render the drill chuck's locking state ineffective. Utility Model Content

[0004] The purpose of this utility model is to provide a hand-tightened drill chuck that is anti-loosening and provides better anti-inertial self-loosening performance of the hand-tightened drill chuck. To this end, the utility model adopts the following technical solutions:

[0005] The nut and the jaws are threadedly connected, and the rotating sleeve is connected to the nut through a connecting structure, so as to drive the nut to rotate. The nut is sleeved on the drill body and supported by a step in the middle of the drill body; the hand-tight drill chuck is characterized in that the hand-tight drill chuck is further provided with a positioned inner support ring, the inner support ring includes a first annular base, the first annular base is sleeved on the drill body, the first annular base is provided with an inner support sheet, the inner support sheet is provided with an outer side surface facing the inner wall of the rotating sleeve, the inner support sheet can be elastically deformed radially outward to be extruded and matched with the rotating sleeve, and the hand-tight drill chuck is provided with an extrusion structure between the nut and the step. During the rotation of the hand-tight drill chuck, the extrusion structure squeezes the inner support ring backward and radially outward based on the reverse thrust received by the nut, so as to push the inner support sheet to elastically deform and open radially outward to be squeezed tightly with the inner wall of the rotating sleeve;

[0006] The hand-tight drill chuck is provided with a flexible filling layer, which is located between the outer side surface of the inner support plate and the inner wall of the rotating sleeve. When the inner support plate elastically deforms and opens radially outward and is tightly fitted with the inner wall of the rotating sleeve, the flexible filling layer fills the gap between the outer side surface and the inner wall of the rotating sleeve, thereby increasing the friction area.

[0007] On the basis of adopting the above technical solutions, the present invention may also adopt the following further technical solutions, or use these further technical solutions in combination:

[0008] The inner supporting piece is in an arc shape, and a circle of inner supporting pieces is arranged on the first ring-shaped base of the inner supporting ring.

[0009] A plurality of vertical gaps are provided in the circle of inner supporting sheets.

[0010] The first ring-shaped base of the inner support ring is placed on the step; the first ring-shaped base of the inner support ring has a radially outer hollow portion, and the inner support piece is bent and arranged on the outer edge of the hollow portion.

[0011] There is a ring-shaped bearing steel ball cavity between the inner support ring and the nut, and a bearing steel ball is set in the bearing steel ball cavity. The bearing steel ball cavity has an action surface facing backward and radially outward, and when working, the bearing steel ball is squeezed radially outward and the inner support plate is elastically deformed radially outward.

[0012] The flexible filling layer is dimethyl silicone oil in a paste form and is extruded and formed between the outer side surface and the inner wall of the rotating sleeve.

[0013] The viscosity of the dimethyl silicone oil is 500,000-3,000,000 cs.

[0014] The flexible filling layer is made of resin and is extruded and formed between the outer side surface and the inner wall of the rotating sleeve.

[0015] The resin material is thermosetting resin.

[0016] The outer side surface of the inner support sheet is arranged in a concave-convex configuration.

[0017] The outer side surface of the inner support piece is provided with a wavy arc-shaped protrusion along the circumferential direction.

[0018] The hand-tight drill chuck is provided with a locking structure, which is used to prevent the nut from rotating in the opposite direction relative to the drill body when the drill chuck is working.

[0019] The locking structure includes a circle of fixed external teeth and a spring piece, the spring piece is configured to be synchronized with the nut in the rotation direction, the spring piece has an inwardly tilted locking end, the external teeth cooperate with the locking end, and the rotating sleeve is provided with a structure for controlling the locking end.

[0020] The locking structure includes a locking piece and an inner support ring. The locking piece is connected to the nut and rotates synchronously with the nut around the central axis of the drill body. The locking piece is provided with a spring piece, and the spring piece has a locking end that is tilted outward. The inner support piece of the inner support ring is provided with an inner ratchet facing radially inward, and the inner ratchet cooperates with the locking end. The rotating sleeve is provided with a structure for controlling the locking end.

[0021] The locking element includes a second annular base, which is located between the first annular base of the inner support ring and the rear end of the nut. The second annular base of the locking element and the inner support ring together form the annular bearing steel ball cavity, and the second annular base of the locking element is provided with the rearward and radially outward acting surfaces.

[0022] The inner support ring forms a circumferential fit with the drill body to prevent relative rotation through the radially inward protrusion of the inner hole wall of the first annular base.

[0023] The drill body is provided with a plurality of arc grooves by axially punching holes on its edge. The first ring-shaped base of the inner support ring is a sheet-shaped ring body, and an arc protrusion is formed around its inner hole to match the arc grooves.

[0024] The locking element includes a second ring-shaped base, on which multiple groups of locking structures are arranged, each group of locking structures includes the spring piece and an outward control protrusion connected to the spring piece, the end of the spring piece is the outward-tilted locking end, the inner wall of the rotating sleeve is provided with a cam surface that cooperates with the outward control protrusion for control, the locking element is further provided with an outward connecting protrusion that is integrated with the locking element, and the rotating sleeve is provided with a connecting groove that cooperates with the outward connecting protrusion.

[0025] Due to the technical solution of the present invention, under the combined effect of the centrifugal force generated by high-speed rotation and the reaction force received by the drill chuck during the drilling process, the present invention can squeeze the inner support ring backward and outward, so that the inner support sheet on the inner support ring is opened outward, and because only a part of the area of ​​the inner support sheet is actually in contact with the inner wall of the rotating sleeve when the inner support ring is opened outward, the flexible filling layer can adaptively deform and fill the gap between the outer side surface and the inner wall of the rotating sleeve during each squeezing, thereby increasing the friction area and improving the anti-loosening performance. Moreover, the flexible filling layer is bound to have a part located in the squeezed position during each operation, thereby avoiding the loss of cutting performance on the inner wall of the rotating sleeve while ensuring the relaxation performance, thereby ensuring the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is an exploded view of the structure of Example 1 of the present utility model.

[0027] Figure 2 This is a cross-sectional view of Example 1 of the utility model before entering the locked state.

[0028] Figure 3 、 Figure 4 They are schematic diagrams of two implementation modes of the inner support ring of Example 1 of the present utility model.

[0029] Figure 5 This is a cross-sectional view of embodiment 1 of the present invention in a locked state.

[0030] Figure 6 This is a schematic diagram of a third implementation of the inner support ring of Example 1 of the present utility model.

[0031] Figure 7 When the third embodiment is adopted for the inner support ring, Figure 5 AA cross-sectional view.

[0032] Figure 8 This is a schematic diagram of the fourth implementation of the inner support ring of Example 1 of the present utility model.

[0033] Figure 9 This is a schematic diagram of the drill body of Example 1 of the present utility model.

[0034] Figure 10 This is a cross-sectional view of Example 2 of the utility model in working condition.

[0035] Figure 11 This is an exploded view of the structure of Example 2 of the present utility model.

[0036] Figure 12 This is an exploded view of the structure of Example 3 of the present utility model.

[0037] Figure 13 This is a cross-sectional view of Example 3 of the utility model in working condition. DETAILED DESCRIPTION

[0038] Example 1, reference Figure 1-9 .

[0039] The utility model provides a hand-tight drill chuck with a locking function, comprising a drill body 1, a clamping jaw 2, a nut 3, and a rotating sleeve. The nut 3 and the clamping jaw 2 are threadedly connected. The rotating sleeve includes an outer sleeve 41 and a bushing 42 fixed to the outer sleeve 41 and arranged in a setting configuration. The bushing 42 in the rotating sleeve is connected to the nut 3 via a connecting structure to drive the nut 3 to rotate. The nut 3 is sleeved outside the drill body 1 and supported by a step 11 in the middle of the drill body.

[0040] The locking drill chuck is provided with a locking structure, which includes a locking piece 5 and a positioned inner support ring 6. The locking piece 5 is connected to the nut 3 and rotates synchronously with the nut 3 around the central axis of the drill body 1. The locking piece 5 is provided with a spring piece 51, and the spring piece 51 has a locking end 52 that is tilted outward. The inner support ring 6 includes a first annular base 60, which is sleeved on the outside of the drill body 1. The first annular base 60 is provided with an inner support piece 61, and the inner support piece 61 is provided with an outer side surface 610 facing the inner wall of the rotating sleeve. The inner support piece 61 can be elastically deformed radially outward to be squeezed and fitted with the rotating sleeve. The inner support piece 61 is provided with an inner ratchet 611 facing radially inward, and the inner ratchet 611 cooperates with the locking end 52. The bushing 42 in the rotating sleeve is provided with a structure for controlling the locking end 52 so that the locking end 52 leaves the inner ratchet 611 or is inserted into the inner ratchet 611. The drill chuck is provided with an extrusion structure between the nut 3 and the step 11. The reverse thrust received by the drill chuck during operation causes the nut 3 to move backward. The reverse thrust received by the nut 3 is transmitted to the extrusion structure, and the extrusion structure extrudes the inner support ring 6 backward and radially outward, causing the inner support ring 6 to bend backward and radially outward (obliquely backward and outward), extruding the inner support piece 61 to elastically deform and open radially outward, and squeeze against the inner wall of the rotating sleeve (the inner wall of the bushing 42 in this embodiment) ( Figure 5 Because the two are in a squeezed state, Figure 2 When the inner support piece 61 rebounds and the two are disengaged in the non-working state, the inner support piece 61 is constrained to enhance the overall locking force of the drill chuck, prevent the nut 3 and the rotating sleeve 42 from loosening by themselves, and prevent the locking from failing due to inertia during operation.

[0041] The inner support piece 61 is in an arc shape. In this embodiment, a circle of inner support pieces 61 is provided on the first ring-shaped base 60 of the inner support ring 6. Figure 3 As shown, a gap 62 is provided in the inner support sheet 61, as shown in FIG. Figure 4 As shown, the inner support piece 61 may not be provided with the gap 62, and may be elastically deformed radially outward within a certain range (for example, based on the deformation of the inner support piece itself, or / and based on the overall elastic deformation of the inner support ring, and tilted outward).

[0042] The hand-tight drill chuck is provided with a flexible filling layer 9, and the flexible filling layer 9 is located between the outer side surface 610 of the inner support sheet 61 and the inner wall of the rotating sleeve. When the inner support sheet 61 elastically deforms and opens radially outward and is tightly fitted with the inner wall of the rotating sleeve, the flexible filling layer 9 fills the gap between the outer side surface 610 and the inner wall of the rotating sleeve to increase the friction area. At the same time, the flexible filling layer 9 can effectively reduce the wear of the inner wall of the rotating sleeve when it contacts the outer periphery of the expanded inner support sheet 61, and play a certain protective role.

[0043] The flexible filling layer is dimethyl silicone oil in a paste form, which is extruded and formed between the outer side surface 610 and the inner wall of the rotating sleeve. The viscosity of the dimethyl silicone oil is preferably 500,000-3,000,000 cs. The flexible filling layer 9 can also be made of resin material, which is soft at room temperature and has a high viscosity, and is extruded and formed between the outer side surface and the inner wall of the rotating sleeve. The above embodiment will not fall off due to its high viscosity. Every time the inner support sheet 61 squeezes the inner wall of the rotating sleeve, it will adaptively deform and fill the gap between the inner support sheet 61 and the inner wall of the rotating sleeve.

[0044] The above resin material is preferably a thermosetting resin.

[0045] like Figure 6 As shown, the outer side surface of the inner support sheet 6 can be set to a concave-convex configuration, such as the serrated shape 64a shown. Or as shown Figure 7 、 8 As shown, the outer side surface of the inner support piece 61 is provided with a wavy arc-shaped protrusion 64 along the circumferential direction. When the inner support piece is squeezed outward, the wavy arc-shaped protrusion 64 or the serrations are tightly fitted with the inner wall of the rotating sleeve.

[0046] An indexing groove 31 may be provided on the nut 3, and the groove walls 32 on both sides of the indexing groove may cooperate with the keys on the inner wall of the rotating sleeve (in this embodiment, the bushing 42 in the rotating sleeve), so that the rotating sleeve 42 and the nut 3 are connected during the tightening process in the locked state and the loosening process after unlocking.

[0047] The first annular base 60 of the inner support ring 6 is placed on the step 11. The inner support ring 6 is pressed against the drill body 1 by the parts in front of it and is axially positioned. The first annular base 60 of the inner support ring 6 has a radially outer hollow portion 63. The inner support piece 61 is bent and arranged at the outer edge of the hollow portion 63, which can reduce the diameter of the drill body 1 while increasing the elastic deformation effect.

[0048] The locking member 5 includes a second annular base 50, which is located between the first annular base 60 of the inner support ring 6 and the rear end of the nut 3. The second annular base 50 of the locking member 5 and the inner support ring 6 together form an annular bearing steel ball cavity, in which a bearing steel ball 7 is arranged. The second annular base 50 has an action surface 501 facing backward and radially outward, and when working, it squeezes the bearing steel ball 7 radially outward and causes the inner support plate 61 to elastically deform radially outward.

[0049] The inner support ring 6 is positioned so as not to rotate relative to the drill body 1. A plurality of arc grooves 12 are formed on the drill body 1 by axially punching holes on its edge. The first ring-shaped base 60 of the inner support ring 6 is a sheet-shaped ring body. During the punching process, an arc protrusion 65 is formed around the inner hole to cooperate with the arc groove 12 to form a circumferential fit to prevent relative rotation. Whether manufacturing the groove 12 or manufacturing and installing the inner support ring 6, it is very convenient.

[0050] The lock element 5 has multiple locking structures disposed on its second annular base 50. Each structure comprises a spring 51 and an outward-directed control protrusion 53 connected to the spring 51. The end of the spring 51 forms a locking end 52 that tilts outward (i.e., away from the center of the circle). The inner wall of the rotating sleeve (in this embodiment, the bushing 42 within the rotating sleeve) is provided with a cam surface that engages with the outward-directed control protrusion 53, causing the locking end 52 to move away from or into the inner ratchet teeth 611. The lock element 5 also has an outward-directed connection protrusion 54 integral with the lock element, and the rotating sleeve (in this embodiment, the bushing 42 within the rotating sleeve) is provided with a connecting groove that engages with the outward-directed connection protrusion. The lock element 5 is connected to the nut 3 by a key 55 on the lock element 5 that engages with a groove 33 on the nut 3.

[0051] Example 2, reference Figure 10 、 11 .

[0052] This embodiment of a mobile phone drill chuck does not have the aforementioned self-locking mechanism. The hand-tight drill chuck comprises a drill body 1, a clamping jaw 2, a nut 3, and a rotating sleeve 4. The nut 3 is threadedly connected to the clamping jaw 2. The interior of the rotating sleeve 4 and the front end of the nut 11 are keyed to drive the nut 3 to rotate. The nut 3 is sleeved onto the drill body 1 and supported by a step 11 in the middle of the drill body.

[0053] Among them, the structure of the inner support ring 6b can adopt the structure of Example 1 except that the inner ratchet is not provided. The figure numbers 60, 61, and 63 respectively represent the first ring-shaped base, the inner support plate, and the suspended portion on the inner support ring 6a. The inner support ring 6b is also placed on the step 11 on the drill body 1 through the first ring-shaped base 60. The extrusion structure adopts an arc-shaped protrusion 34 provided at the rear end of the nut. The implementation method of the flexible filling layer 9 is the same as that of Example 1. It is located between the outer surface of the inner support plate 61 and the inner wall of the rotating sleeve. Therefore, during operation, the inner support plate 61 is squeezed tightly against the inner wall of the rotating sleeve and the gap between the inner support plate 61 and the inner wall of the rotating sleeve is filled with the flexible filling layer 9. For a hand-tightened drill chuck that does not have a self-locking function, it can also prevent it from loosening in the reverse direction due to inertia during operation, thereby affecting the clamping of the drill bit.

[0054] Example 3, reference Figure 12 、 13

[0055] In this embodiment, a hand-tight drill chuck with a locking function is provided. Its locking structure is different from that of embodiment 1, and it adopts an external tooth type locking structure.

[0056] The hand-tight drill chuck is provided with a drill body 1, a clamping jaw 2, a nut 3, and a rotating sleeve. The nut 3 and the clamping jaw 2 are threadedly connected. The rotating sleeve is similar to that in Example 1 and is composed of a bushing 42 and an outer sleeve 41. The nut 3 is sleeved on the outside of the drill body 1 and supported on a step 11 in the middle of the drill body. The rotating sleeve (bushing 42) drives the nut 3 to rotate through a locking structure and a keyway structure (similar to Example 1). The locking structure includes a circle of external teeth 13 fixed to the surface of the drill body and a spring 56. The spring 56 is clamped on the front key of the nut 3 and rotates synchronously with the nut in the rotation direction. The spring 56 has an inward-facing locking end 57. The external teeth 13 cooperate with the locking end 57. The rotating sleeve is provided with a structure for controlling the locking end.

[0057] The inner support ring 6c in this embodiment also includes a first annular base 60c, an inner support sheet 67 and a suspended portion 66. The inner support ring 6b is also placed on the step 11 on the drill body 1 through the first annular base 60c. The inner support ring 6c is not provided with an internal ratchet. A bearing consisting of a plastic bearing frame 81 positioning balls 82 is provided between the nut 3 and the first annular base 60c. The bearing serves as an extrusion structure. An inclined surface 35 is provided on the rear end face of the nut 3. When in operation, the nut 3 is subjected to a backward reaction force and pushes the balls 82 through the inclined surface 35, causing the plastic bearing frame 81 to expand backward and outward, squeezing the inner support sheet 67 to expand outward and squeeze the inner wall of the rotating sleeve. The implementation method of the flexible filling layer 9 is the same as that of Example 1. It is located between the outer surface of the inner support sheet 67 and the inner wall of the rotating sleeve (the inner wall of the bushing 42).

[0058] Therefore, during operation, the inner support piece 67 is squeezed against the inner wall of the rotating sleeve and the gap between the inner support piece 67 and the inner wall of the rotating sleeve is filled with the flexible filling layer 9. For a hand-tightened drill chuck with a self-locking function, it can also be prevented from loosening in reverse due to inertia during operation, thereby preventing the locking function from failing.

[0059] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by any technician in this field within the field of the present invention are included in the protection scope of the present invention.

[0060] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0061] In the description of this utility model, it should be understood that terms such as "one end," "the other end," "outer side," "inner side," "horizontal," "end," "length," "outer end," "left," and "right" are used to indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are used solely to facilitate the description of this utility model and to simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "first" and "second" are used solely for brevity of description and do not indicate or imply relative importance.

Claims

1. A hand-tight drill chuck, comprising a drill body (1), a clamping jaw (2), a nut (3), and a rotating sleeve, wherein the nut (3) and the clamping jaw (2) are threadedly connected, and the rotating sleeve is connected to the nut (3) through a connecting structure to drive the nut (3) to rotate, and the nut is sleeved outside the drill body (1) and supported on a step in the middle of the drill body; characterized in that The hand-tight drill chuck is further provided with a positioned inner support ring (6), the inner support ring (6) comprising a first annular base (60), the first annular base (60) being sleeved outside the drill body (1), the first annular base (60) being provided with an inner support sheet (61), the inner support sheet (61) being provided with an outer side surface facing the inner wall of the rotating sleeve, the inner support sheet (61) being elastically deformed radially outward and being pressed together with the rotating sleeve, the hand-tight drill chuck is provided with an extrusion structure between the nut (3) and the step, and during the rotation of the hand-tight drill chuck, the extrusion structure extrudes the inner support ring backward and radially outward based on the reverse thrust received by the nut, pushing the inner support sheet (61) to elastically deform and open radially outward and be pressed together with the inner wall of the rotating sleeve; The hand-tight drill chuck is provided with a flexible filling layer, which is located between the outer side surface of the inner support piece and the inner wall of the rotating sleeve. When the inner support piece (61) elastically deforms and opens radially outward to be tightly fitted with the inner wall of the rotating sleeve, the flexible filling layer fills the gap between the outer side surface and the inner wall of the rotating sleeve, thereby increasing the friction area.

2. A hand-tight drill chuck according to claim 1, characterized in that: The inner support piece (61) is in an arc shape, and a circle of inner support pieces (61) is provided on the first ring-shaped base (60) of the inner support ring (6).

3. A hand-tight drill chuck according to claim 2, characterized in that: A plurality of vertical gaps (62) are provided in the circle of inner support sheets (61).

4. A hand-tight drill chuck according to claim 1, characterized in that: The first ring-shaped base (60) of the inner support ring (6) is placed on the step; the first ring-shaped base (60) of the inner support ring (6) has a radially outer hollow portion (63), and the inner support sheet (61) is bent and arranged at the outer edge of the hollow portion (63).

5. A hand-tight drill chuck according to claim 1, characterized in that: A ring-shaped bearing steel ball cavity is provided between the inner support ring (6) and the nut (3), and a bearing steel ball (7) is arranged in the bearing steel ball cavity. The bearing steel ball cavity has an action surface facing backward and radially outward, and when working, the bearing steel ball is squeezed radially outward and the inner support plate (61) is elastically deformed radially outward.

6. A hand-tight drill chuck according to claim 1, characterized in that: The flexible filling layer is dimethyl silicone oil in a paste form and is extruded and formed between the outer side surface and the inner wall of the rotating sleeve.

7. A hand-tight drill chuck according to claim 6, characterized in that: The viscosity of the dimethyl silicone oil is 500,000-3,000,000 cs.

8. A hand-tight drill chuck according to claim 1, characterized in that: The flexible filling layer is made of resin and is extruded and formed between the outer side surface and the inner wall of the rotating sleeve.

9. A hand-tight drill chuck according to claim 8, characterized in that: The resin material is thermosetting resin.

10. The hand-tight drill chuck according to claim 1, characterized in that: The outer side surface of the inner support sheet is arranged in a concave-convex configuration.

11. A hand-tight drill chuck according to claim 1, characterized in that: The outer side surface of the inner support sheet (61) is provided with a wavy arc-shaped protrusion (64) along the circumferential direction.

12. A hand-tight drill chuck according to claim 1, characterized in that: The hand-tight drill chuck is provided with a locking structure, which is used to prevent the nut from rotating in the opposite direction relative to the drill body when the drill chuck is working.

13. A hand-tight drill chuck according to claim 12, characterized in that: The locking structure includes a circle of fixed external teeth and a spring piece, the spring piece is configured to be synchronized with the nut in the rotation direction, the spring piece has an inwardly tilted locking end, the external teeth cooperate with the locking end, and the rotating sleeve is provided with a structure for controlling the locking end.

14. A hand-tight drill chuck according to claim 12, characterized in that: The locking structure comprises a locking element (5) and an inner support ring (6); the locking element (5) is connected to the nut (3) and rotates synchronously with the nut (3) around the central axis of the drill body (1); the locking element (5) is provided with a spring piece (51); the spring piece (51) has a locking end (52) tilted outward; the inner support piece (61) of the inner support ring (6) is provided with an inner ratchet (611) facing radially inward; the inner ratchet (611) cooperates with the locking end (52); and the rotating sleeve is provided with a structure for controlling the locking end (52).

15. A hand-tight drill chuck according to claim 14, characterized in that: The locking member (5) includes a second annular base (50), the second annular base (50) of the locking member (5) is located between the first annular base (60) of the inner support ring (6) and the rear end of the nut (3), the second annular base (50) of the locking member (5) and the inner support ring (6) together enclose the annular bearing steel ball cavity, and the second annular base (50) of the locking member (5) is provided with the rearward and radially outward action surface (501).

16. The hand-tight drill chuck according to claim 1, characterized in that: The inner support ring (6) forms a circumferential fit with the drill body (1) to prevent relative rotation through the radially inward protrusion of the inner hole wall of its first ring-shaped base (60).

17. A hand-tight drill chuck according to claim 12, characterized in that: The drill body (1) is provided with a plurality of arc grooves (12) by axially punching holes at its edge. The first ring-shaped base (60) of the inner support ring (6) is a sheet-shaped ring body, and an arc protrusion (65) is formed around its inner hole to match the arc grooves (12).

18. The hand-tight drill chuck according to claim 14, characterized in that: The locking element (5) comprises a second ring-shaped base (50), and a plurality of locking structures are arranged on the second ring-shaped base (50) of the locking element (5), each locking structure comprising the spring piece (51) and an outward control protrusion (53) connected to the spring piece (51), the end of the spring piece (51) being the outward-curved locking end (52), the inner wall of the rotating sleeve being provided with a cam surface for controlling and cooperating with the outward control protrusion (53), the locking element (5) being further provided with an outward connecting protrusion (54) integral with the locking element, and the rotating sleeve being provided with a connecting groove for cooperating with the outward connecting protrusion (54).

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