CN110052634B

CN110052634B - Quick clamping drill chuck

Info

Publication number: CN110052634B
Application number: CN201910338990.2A
Authority: CN
Inventors: 于成银; 魏宁波
Original assignee: Roehm Weida Machinery Shandong Co ltd
Current assignee: Roehm Weida Machinery Shandong Co ltd
Priority date: 2019-04-25
Filing date: 2019-04-25
Publication date: 2024-04-23
Anticipated expiration: 2039-04-25
Also published as: CN110052634A

Abstract

The invention provides a quick clamping drill chuck which solves the technical problem of lower working efficiency of the existing drill chuck, and comprises a drill body, clamping jaws, nuts, steel balls, clamping springs and a rear cover, wherein the clamping jaws are respectively arranged in drill body grooves which are uniformly distributed along the circumferential direction on the drill body, the rear end of the drill body is fixed with the rear cover through the clamping springs, drill body threads are arranged on the outer circle of the front end of the drill body, the nuts are in threaded connection with the drill body through the drill body threads, grooves are formed in the inner wall of the nuts, two sides of the grooves are respectively provided with a nut clamping positioning surface and a nut loosening positioning surface, the nut loosening positioning surface protrudes out of the inner wall of the nuts and is perpendicular to the inner wall of the nuts, and two side surfaces of the front end of the clamping jaws are respectively provided with a clamping jaw clamping positioning surface and a clamping jaw loosening positioning surface.

Description

Quick clamping drill chuck

Technical Field

The invention relates to the technical field of drilling tools, in particular to a rapid clamping drill chuck.

Background

The existing drill chuck is generally composed of a drill body, clamping jaws, nuts and an outer sleeve, wherein the clamping jaws are respectively arranged in three equally-divided inclined holes of a main body, the nuts are arranged in nut grooves of the main body, the nuts and threads of the clamping jaws form thread transmission and can do spiral movement, so that the working states of clamping and loosening are realized; however, during the working time of the drill chuck, in order to ensure the clamping performance, the pitches of the clamping jaw and the nut are relatively small, so that the working efficiency is seriously affected when the clamping jaw is operated from the maximum clamping range to the minimum clamping range or from the slightly larger clamping range, and the number of operating turns is generally about 20.

Disclosure of Invention

The invention provides a quick clamping drill chuck with lower working efficiency, which aims at the technical problem of lower working efficiency of the existing drill chuck.

The clamping jaw is respectively arranged in drilling body grooves which are uniformly distributed along the circumferential direction on the drilling body, the rear end of the drilling body is fixed with the rear cover through the clamping spring, the outer circle of the front end of the drilling body is provided with drilling body threads, the nut is in threaded connection with the drilling body through the drilling body threads, the inner wall of the nut is provided with a groove, two sides of the groove are respectively provided with a nut clamping locating surface and a nut loosening locating surface, the nut loosening locating surface protrudes out of the inner wall of the nut and is perpendicular to the inner wall of the nut, two side surfaces of the front end of the clamping jaw are respectively provided with a clamping jaw clamping locating surface and a clamping jaw loosening locating surface, and the front end of the clamping jaw is arranged in the groove of the nut through the clamping jaw clamping locating surface and the clamping jaw loosening locating surface.

Preferably, the number of the clamping jaws is 2 or 3, and the number of the grooves is the same as the number of the clamping jaws.

Preferably, the clamping jaw is provided with a clamping jaw round pin hole, the drill body is provided with a round pin hole, a round pin is arranged at the clamping jaw round pin hole, the clamping jaw is fixed on the drill body through the round pin, and the clamping jaw can rotate around the round pin.

Preferably, the clamping jaw is provided with a positioning ball groove, and the steel ball is matched with the positioning ball groove.

Preferably, the spherical surface of the positioning ball groove comprises three transition arcs, namely a low arc, a medium arc and a high arc.

The invention has simple structure, the outer circle of the front end of the drill body is provided with threads, the nut and the threads can be connected together through the threads, the clamping jaw is fixed in the drill body groove through the round pin, and the nut can move back and forth through the threads of the drill body, thereby pushing the clamping jaw to loosen and clamp; the clamping jaw top is equipped with the location ball groove, has three transition circular arcs, and there is slight difference three transition circular arc height, and the steel ball rolls friction when this region is tight, frictional force when reducible drive increases the input, can produce partial sliding friction when unclamping, can increase unclamping moment to guarantee that the clamping state is more reliable, practical convenient.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a cross-sectional view of the structure of the present invention;

FIG. 3 is a cross-sectional view of the drill body;

FIG. 4 is a schematic view of the structure of the drill body;

FIG. 5 is a front view of the jaw;

FIG. 6 is a rear view of the jaw;

FIG. 7 is a schematic view of the structure of the clamping jaw;

FIG. 8 is a schematic view of the structure of the nut;

FIG. 9 is a schematic view of the structure of the nut;

FIG. 10 is an assembly view of the drill body, round pin, jaw, and steel ball;

FIG. 11 is a schematic view of the assembly of the body, round pin, jaw and steel ball;

FIG. 12 is a cross-sectional view of a detent ball groove in a clamping jaw;

FIG. 13 is a cross-sectional view of the jaw released condition;

FIG. 14 is a top cross-sectional view of the jaw released condition;

FIG. 15 is a schematic view showing the combination of the detent ball groove and the ball in the released state;

fig. 16 is a cross-sectional view in a locked state;

FIG. 17 is a top cross-sectional view of the locked position;

fig. 18 is a schematic view showing the combination of the positioning ball groove and the steel ball in the locked state.

The symbols in the drawings illustrate:

1. A drill body; 2. a nut; 3. a clamping jaw; 4. a steel ball; 5. clamping springs; 6. a rear cover; 7. round pins; 8. drilling a body thread; 9. drilling a body groove; 10. round pin holes; 11. positioning ball grooves; 12. clamping jaw clamping positioning surface; 13. the clamping jaw loosens the locating surface; 14. clamping jaw round pin holes; 15. the nut clamps the locating surface; 16. loosening the positioning surface by the nut; 17. a low arc; 18. a middle arc; 19. high arc; 20. a thread; 21. a groove.

Detailed Description

Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1 and 2, the drill comprises a drill body 1, clamping jaws 3, nuts 2, steel balls 4, clamping springs 5 and a rear cover 6, wherein the number of the clamping jaws 3 is 3, the 3 clamping jaws 3 are respectively arranged in 3 drill body grooves 9 uniformly distributed on the drill body 1 along the circumferential direction, as shown in fig. 3, 4 and 5, clamping jaw round pin holes 14 are formed in the clamping jaws 3, round pin holes 10 are formed in the drill body 1, round pins 7 are arranged at the positions of the clamping jaw round pin holes 14, the clamping jaws 3 are fixed on the drill body 1 through the round pins 7, the clamping jaws 3 can rotate around the round pins 7, and the rear end of the drill body 1 is fixed with the rear cover 6 through the clamping springs 5, so that the axial fixation of the drill body 1 is realized.

The excircle of the front end of the drill body 1 is provided with a drill body thread 8, the interior of the nut 2 is provided with a thread 20 matched with the drill body thread 8, the nut 2 is in threaded connection with the drill body 1 through the drill body thread 8, and the nut 2 can rotate through threaded connection and drive the clamping jaw 3 so as to rapidly realize clamping and loosening operations.

As shown in fig. 6, 7, 8, 9, 10 and 11, the inner wall of the nut 2 is provided with grooves 21, the number of the grooves 21 is the same as that of the clamping jaws 3, two sides of the grooves 21 are respectively provided with a nut clamping positioning surface 15 and a nut loosening positioning surface 16, the nut loosening positioning surface 16 protrudes out of the inner wall of the nut 2 and is perpendicular to the inner wall of the nut 2, two side surfaces at the front end of the clamping jaw 3 are respectively provided with a clamping jaw clamping positioning surface 12 and a clamping jaw loosening positioning surface 13, and the front end of the clamping jaw 3 is arranged in the groove 21 of the nut 2 through the clamping jaw clamping positioning surface 12 and the clamping jaw loosening positioning surface 13.

The clamping jaw 3 is provided with the positioning ball groove 11, the steel ball 4 is matched with the positioning ball groove 11, as shown in fig. 12, the spherical surface of the positioning ball groove 11 comprises three transition arcs, namely a low arc 17, a middle arc 18 and a high arc 19, the radian of the high arc 19 in the positioning ball groove 11 is sequentially higher than that of the middle arc 18 and the low arc 17, slight difference exists among the heights of the low arc 17, the middle arc 18 and the high arc 19, the steel ball 4 rolls and rubs when the transition arc area is clamped, and the purposes of reducing friction and improving unlocking moment when the steel ball is loosened can be achieved.

As shown in fig. 13,14 and 15, when the nut 2 rotates clockwise relative to the drill body 1, the nut clamping locating surface 15 drives the clamping jaw clamping locating surface 12, so that the clamping jaw 3 rotates clockwise around the round pin 7, and when the three clamping jaws 3 are in rotary contact, the minimum clamping range can be reached, the drill chuck is in a clamping state, and the steel ball 4 is located in the low arc 17 of the clamping jaw locating ball groove.

As shown in fig. 16, 17 and 18, when the nut 2 is rotated counterclockwise, the nut loosening positioning surface 16 drives the jaw loosening positioning surface 13 so that the jaw 3 rotates around the round pin 7, and a completely loosened state can be achieved with a rotation of less than 90 degrees; meanwhile, the steel ball 4 slides from the low arc 17 of the positioning ball groove 11 to the middle arc 18 of the positioning ball groove 11 and finally reaches the position of the middle high arc 19 of the positioning ball groove 11, and as the high arc 19 of the positioning ball groove 11 is slightly higher than the middle arc 18 of the positioning ball groove and the middle arc 18 of the positioning ball groove 11 is slightly higher than the low arc 17 of the positioning ball groove 11, huge resistance is generated when loosening, and the loosening moment is effectively increased.

However, the foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, so that the substitution of equivalent elements or equivalent variations and modifications within the scope of the invention are intended to fall within the scope of the claims.

Claims

1. The utility model provides a quick clamp drill chuck, its includes bores body, clamping jaw, nut, steel ball, jump ring and back lid, the clamping jaw set up respectively in the circumference evenly distributed's on the bores body bore body inslot, bore body rear end through the jump ring with the back lid is fixed, bore body front end excircle is equipped with bores body screw thread, the nut through bore body screw thread with bore body threaded connection, its characterized in that, the nut inner wall is equipped with the recess, the recess both sides are established respectively and are nut clamp locating surface and nut loosen the locating surface, the nut loosen the locating surface outstanding the nut inner wall and perpendicular to nut inner wall sets up, two sides of clamping jaw front end are established respectively and are clamping jaw clamp locating surface and clamping jaw loosen the locating surface, the clamping jaw front end is through clamping jaw clamp locating surface and clamping jaw loosen the locating surface and be located in the recess of nut, be equipped with the locating ball groove on the clamping jaw, the steel ball with the locating ball groove cooperatees.

2. The quick-grip drill chuck according to claim 1, wherein the number of the jaws is 2 or 3, and the number of the grooves is the same as the number of the jaws.

3. The quick clamping drill chuck according to claim 1, wherein the clamping jaw is provided with a clamping jaw round pin hole, the drill body is provided with a round pin hole, a round pin is arranged at the clamping jaw round pin hole, the clamping jaw is fixed on the drill body through the round pin, and the clamping jaw can rotate around the round pin.

4. The quick clamping drill chuck of claim 1, wherein the spherical surface of the positioning ball groove comprises three transition arcs, low, medium and high.