Quick connector of drill bit

Abstract

The utility model discloses a drill bit quick connector which comprises a connecting sleeve, a rotating sleeve, a tightening column and an elastic pre-tightening piece. A connecting part is arranged at one end of the connecting sleeve, and at least three self-tightening structures comprising arc-shaped bottom grooves and tightening slopes are arranged in a sleeve at the other end of the connecting sleeve; the tightening column is matched with the rotating notch, the outer edge of the tightening column protrudes out of the rotating notch, and the elastic pre-tightening piece drives the tightening column and the rotating notch to rotate towards the tightening inclined face. The device has the beneficial effects that the elastic pre-tightening piece drives self-tightening and can be quickly disassembled and assembled without a tool, so that the efficiency is obviously improved; the multiple self-tightening structures cooperate with the tightening columns to adapt to multi-size and multi-shape drill bits and small-size deviation parts; when the electric drill rotates, a pre-tightening enhancing cycle is formed, the elastic fatigue loosening problem is solved, loads are dispersed through multi-column clamping, and the stability and the service life are improved; and the structure is simple and easy to machine, the cost is controllable, and adaptability and economical efficiency are both achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric tool quick connector technical field, concretely relates to a drill quick connector. BACKGROUND

[0002] As an indispensable electric tool in the fields of building construction, decoration and equipment installation, the electric drill can efficiently complete the drilling and breaking of hard materials such as concrete and masonry by virtue of its rotary and impact combined operation mode. In the actual use process of the electric drill, drill bits, chisel bits and other same type drill bit components need to be frequently replaced according to different operation requirements (such as drilling diameter, breaking strength, etc.). Therefore, the connecting joint between the electric drill and the drill bit as the core adaptive component directly affects the operation efficiency and construction quality in terms of disassembly and assembly convenience, connection stability and adaptive compatibility.

[0003] The connecting structure of the electric drill and the drill bit on the market at present mainly includes traditional threaded connection, pin fixed connection and ordinary quick plug connection. Among them, the traditional threaded connection structure is fixed by the screwing of the threaded pair. Although it has a certain connection reliability, when the drill bit is frequently replaced, the threaded pair needs to be repeatedly tightened or loosened with the help of a tool, which is tedious and time-consuming to operate. Especially in the high-altitude operation or narrow space operation scene, the disassembly and assembly efficiency is extremely low, which seriously affects the construction progress.

[0004] The pin fixed connection structure is fixed by inserting the pin through the positioning holes of the electric drill output shaft and the drill bit. Although the disassembly and assembly speed of this structure is slightly improved compared with the threaded connection, it has obvious adaptive limitations. The positioning holes of the drill bit and the connecting shaft need to be accurately aligned to complete the pin installation, and different specifications of the drill bit need to be matched with different sizes of the positioning hole and the pin, which has poor compatibility. At the same time, long-term rotary impact operation can easily cause the pin to wear, deform or even fall off, which has the safety hazard of connection failure.

[0005] The existing ordinary quick plug connection structure mainly adopts the single elastic jaw or steel ball top pressing mode to realize quick fixing. Although it solves the problem of tedious disassembly and assembly of the traditional structure, it still has deficiencies in adaptability and stability. On the one hand, the tightening range of the elastic jaw or the steel ball is limited, and it can only adapt to drill bits of a certain size range. Drill bits with slightly different shapes or small size deviations cannot be reliably fixed. On the other hand, during the high-frequency rotary impact operation of the electric drill, the elastic component is prone to fatigue relaxation, which causes the pre-tightening force of the jaw or the steel ball to decrease, and then the drill bit to loosen and shake, which not only affects the operation accuracy, but also may cause safety accidents due to the falling of the drill bit.

[0006] In view of the problems of low dismounting efficiency, poor compatibility, insufficient connection stability and fatigue failure of the existing electric drill connecting joint, an electric drill connecting structure capable of realizing quick dismounting, adapting to drill bits of various sizes and shapes and maintaining stable pre-tightening force in long-term rotary impact operation is urgently needed to meet the dual requirements of operation efficiency and safety and reliability in actual construction scenes. Utility model content

[0007] In view of the deficiencies in the background art, the utility model provides a drill quick connector.

[0008] The technical scheme adopted by the utility model is: a drill quick connector, comprising:

[0009] A connecting sleeve has a connecting part connected with an electric drill at one end, and at least three self-tightening structures are arranged in the sleeve at the other end, the self-tightening structure comprises an arc-shaped bottom groove and a tightening inclined surface, and the tightening inclined surface is arranged on one side in the rotation direction of the electric drill;

[0010] A rotating sleeve is provided with rotating notches matched with the self-tightening structures on the outer wall thereof;

[0011] A tightening column is provided with a connecting port at one end, the tightening column is rotationally matched with the rotating notches, and the outer edge of the tightening column can be protrusively arranged from the side wall portions on both sides of the rotating notches;

[0012] An elastic pre-tightening piece is used to rotate the rotating sleeve and the tightening column to one side of the tightening inclined surface.

[0013] Further, one end of the elastic pre-tightening piece is connected with the first connecting hole on the rotating sleeve, and the other end is connected with the second connecting hole on the sleeve.

[0014] Further, the elastic pre-tightening piece is two, and is arranged at both ends of the rotating sleeve.

[0015] Further, it further comprises a rotating cover rotationally matched with one end of the connecting sleeve, the rotating cover is provided with a connecting hole in the middle, one end of the rotating sleeve is provided with a connecting end connected with the connecting hole, and the connecting hole and the connecting end are provided with limiting surfaces preventing the relative rotation of the connecting end and the connecting hole.

[0016] Further, the rotating notches are provided with transverse grooves, the outer wall of the middle part of the tightening column is provided with a ring-shaped groove, and the transverse grooves and the ring-shaped groove are provided with elastic rings.

[0017] Further, the outer wall of the tightening column is provided with a friction-increasing concave line.

[0018] Further, one end of the sleeve is provided with an internal screw hole, and one end of the connecting part is provided with an external screw thread section for threaded connection with the internal screw hole.

[0019] The utility model discloses beneficial effect is:

[0020] 1. Improve the dismounting efficiency, realize the quick replacement of drill bit: the patent through the collaborative design of connecting sleeve, rotating sleeve, tightening column and elastic pre-tightening piece, the quick dismounting structure without tool auxiliary is constructed.When replacing drill bit, only need to insert the drill bit into the connecting port of tightening column, and the elastic pre-tightening piece can drive the rotating sleeve to rotate to the side of tightening slope, so that the tightening column is tightened inward and fixed drill bit under the action of tightening slope, and when dismounting, only need to rotate the rotating sleeve reversely to release the tightening column, and the drill bit is taken out.The whole process does not need to borrow spanner, screwdriver and other tools, and the operation steps are simplified, compared with the repeated screwing of traditional threaded connection and the accurate alignment and insertion of pin connection, the dismounting time is greatly shortened, especially suitable for the frequent head replacement demand in complex scenes such as high-altitude operation and narrow space, and the construction efficiency is effectively improved.

[0021] 2. Excellent compatibility, compatible with drill bits of multiple sizes and multiple shapes: at least three self-tightening structures are arranged in the connecting sleeve, and the adjustable tightening range of the tightening column is designed, so that the tightening column can be self-adaptively adjusted according to the actual size and shape of the inserted drill bit.Compared with the fixed tightening range of the elastic clamping jaw and the steel ball in the existing ordinary quick insertion connection, the structure can be adapted to drill bits of different diameters and different shapes (such as hexagonal and round handles), and can still reliably fix the drill bits with slight size deviation, without the need to provide special joints for drill bits of different specifications, thereby reducing the tool adaptation cost and improving the universality and application range of the joint.

[0022] 3. High connection stability and reliability, long-term pre-tightening force: on the one hand, the elastic pre-tightening piece provides a continuous pre-tightening driving force for the tightening column, so that the tightening column always adheres to the tightening slope and stably clamps the drill bit; on the other hand, the tightening slope is located on one side of the rotation direction of the electric drill, and the rotation torque during the operation of the electric drill drives the rotating sleeve to further rotate to the side of the tightening slope, and drives the tightening column to continuously press the drill bit, forming a positive cycle of "operation rotation-pre-tightening enhancement", which completely solves the problem of pre-tightening force reduction caused by elastic fatigue of the existing quick insertion structure.At the same time, compared with the defect that the pin connection is easy to wear and fall off, the structure cooperates with the multiple tightening columns through the face contact of the tightening slope, disperses the impact load, reduces the wear of the parts, prolongs the service life of the joint, avoids the safety hazards and operation precision deviation caused by the loosening and falling off of the drill bit.

[0023] 4. The structure design is simple and reasonable, and the manufacturing cost is controllable: the core components of the patent only include a connecting sleeve, a rotating sleeve, a tightening column and an elastic pre-tightening piece, each component is simple in structure and easy to process and form, without complex precision manufacturing process; at the same time, the component assembly method is simple, which reduces the production and assembly cost. Compared with the complex transmission structure of some high-end quick connectors, the patent has excellent performance while taking into account the economy, facilitating large-scale production and market promotion, and has high practical value and industrialization prospect.

[0024] In summary, the drill bit quick connector solves the core pain points of the existing connection structure, such as complicated disassembly and assembly, poor adaptability, insufficient stability and short service life, through ingenious self-tightening structure and stress design, and forms multiple advantages in operation efficiency, compatibility, reliability and economy, which can fully meet the actual use requirements in the fields of building construction, decoration and the like.

[0025] In addition to the purposes, features and advantages described above, the utility model has other purposes, features and advantages.

[0026] The utility model will be further described in detail below with reference to the drawings. DRAWINGS

[0027] Fig. 1 It is a structural schematic view of the utility model.

[0028] Fig. 2 It is an explosion schematic view of the utility model.

[0029] Fig. 3 It is a structural schematic view of the rotating sleeve.

[0030] Fig. 4 It is a structural schematic view of the tightening column.

[0031] Fig. 5 It is a sectional schematic view of the utility model.

[0032] Fig. 6 It is a structural schematic view of the sleeve.

[0033] Figs. 1-6 1, connecting sleeve; 2, connecting part; 3, sleeve; 4, arc-shaped bottom groove; 5, tightening inclined surface; 6, rotating sleeve; 7, rotating notch; 8, tightening column; 9, connecting port; 10, elastic pre-tightening piece; 11, first connecting hole; 12, second connecting hole; 13, rotating cover; 14, connecting hole; 15, connecting end; 16, limiting surface; 17, transverse groove; 18, annular groove; 19, prop-up elastic ring; 20, friction-increasing concave line; 21, inner screw hole; 22, outer threaded section. DETAILED DESCRIPTION

[0034] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0035] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0036] The present application provides a drill bit quick connector.

[0037] In the present embodiment, with reference to Figs. 1-6 The drill bit quick connector comprises:

[0038] A connecting sleeve 1 has a connecting portion 2 connected with an electric drill at one end, and at least three self-tightening structures are arranged at intervals in a sleeve 3 at the other end, the self-tightening structure comprises an arc-shaped bottom groove 4 and a tightening inclined surface 5, and the tightening inclined surface is arranged on one side in the rotating direction of the electric drill.

[0039] A rotating sleeve 6 has rotating notches 7 adapted to the self-tightening structure arranged at intervals on the outer wall of the rotating sleeve 6.

[0040] A tightening column 8 has a connecting port 9 arranged at one end, the tightening column is rotationally matched with the rotating notches, and the outer edge of the tightening column can be arranged to protrude from the two side walls of the rotating notches.

[0041] An elastic pre-tightening member 10 is used to rotate the rotating sleeve and the tightening column to one side of the tightening inclined surface.

[0042] In the technical solution, the connecting sleeve is rigidly connected with the electric drill through the connecting portion at one end, and at least three self-tightening structures (arc-shaped bottom groove + tightening inclined surface) are arranged in the sleeve at intervals to form a clamping positioning reference, wherein the tightening inclined surface is arranged on one side of the rotating direction of the electric drill to form a structure basis for "force self-adaptation". Secondly, the rotating sleeve is rotationally connected with the tightening column through the outer wall rotating notch, and the outer edge of the tightening column protrudes from the rotating notch, so that the tightening column can be in surface contact with the arc-shaped bottom groove and the tightening inclined surface of the self-tightening structure. Finally, the elastic pre-tightening member provides a continuous pre-tightening torque to drive the rotating sleeve to rotate the tightening column to the side of the tightening inclined surface, and the inclined structure of the tightening inclined surface converts the rotating motion into a radial inward tightening force of the tightening column to achieve clamping and fixing of the drill bit inserted into the connecting port. At the same time, the rotating torque of the electric drill during operation can further drive the rotating sleeve to rotate to the side of the tightening inclined surface to strengthen the tightening effect.

[0043] The self-tightening mechanism driven by the elastic pre-tightening member can automatically tighten and fix the drill bit after insertion, and can be released by reversing the rotating sleeve during disassembly. Compared with the traditional threaded connection and pin connection, the tool dependence is completely eliminated, and the disassembly efficiency and pre-tightening and fastening effect are greatly improved.

[0044] Specifically, one end of the elastic pre-tightening member is connected with the first connecting hole 11 on the rotating sleeve, and the other end is connected with the second connecting hole 12 on the sleeve.

[0045] In this embodiment, the elastic pre-tightening member adopts a "two-point positioning" structure, one end is fixedly connected with the first connecting hole on the rotating sleeve, and the other end is rigidly fixed with the second connecting hole on the sleeve of the connecting sleeve, so that the elastic pre-tightening member is always in a pre-stretched or pre-compressed state, providing a constant directional rotating torque for the rotating sleeve, ensuring that the rotating sleeve continuously fits the tightening column to the tightening inclined surface, and avoiding the decay of the pre-tightening force due to loose connection.

[0046] Specifically, the elastic pre-tightening member is two, which are arranged at both ends of the rotating sleeve.

[0047] In this embodiment, the two elastic pre-tightening members are symmetrically distributed at both ends of the rotating sleeve, and form balanced torque output through "two-end synchronous pre-tightening", so that the rotating sleeve is evenly stressed during rotation, avoiding eccentricity and inclination of the rotating sleeve caused by single pre-tightening member, ensuring that the tightening columns are synchronously fitted to the tightening inclined surface, and achieving uniform clamping.

[0048] Specifically, it further includes a rotating cover 13 rotationally connected with one end of the connecting sleeve, a connecting hole 14 is arranged in the middle of the rotating cover 13, one end of the rotating sleeve is provided with a connecting end 15 connected with the connecting hole 14, and a limiting surface 16 is arranged on the connecting hole and the connecting end to prevent relative rotation of the connecting end and the connecting hole.

[0049] In the embodiment, the rotating cover is rotationally connected with one end of the connecting sleeve, the center connecting hole is assembled with the connecting end of the rotating sleeve, and the limiting surfaces (such as flat surfaces, polygonal surfaces) arranged on the connecting hole and the connecting end form an anti-rotation structure. The design realizes the axial limiting of the rotating sleeve through the rotating cover, and ensures the synchronous rotation of the rotating cover and the rotating sleeve through the limiting surfaces, so that the quick connector can be disassembled and assembled by operating the rotating cover.

[0050] Specifically, a transverse groove 17 is arranged between the rotating grooves, an annular groove 18 is arranged on the outer wall of the middle part of the tightening column, and a supporting elastic ring 19 is arranged on the transverse groove and the annular groove.

[0051] In the embodiment, the transverse grooves are arranged between the rotating grooves of the rotating sleeve, and the annular grooves are arranged on the outer wall of the middle part of the tightening column. The supporting elastic ring is arranged on the transverse groove and the annular groove, and is used for supporting the outward opening of the tightening column. The supporting elastic ring is arranged on the inner side of the three rollers. When the three rollers are inwardly closed, the supporting elastic ring becomes a triangle, and outward elastic force is generated. When the shell is reversed to loosen the tightening column, the supporting elastic ring supports the outward reset of the tightening column.

[0052] Specifically, the outer wall of the tightening column is provided with a friction-increasing groove 20.

[0053] In the embodiment, the friction-increasing groove (such as a net-shaped groove, an arc-shaped groove, a straight groove, a diamond-shaped groove, etc.) is arranged on the outer wall of the tightening column. By changing the contact interface structure of the tightening column and the drill handle, the friction coefficient between the two is increased. When the tightening column is radially tightened, the friction-increasing groove is embedded in the surface of the drill handle (especially the small rough surface of the metal handle), forming a double fixing mechanism of “mechanical occlusion + friction clamping”, and improving the clamping reliability.

[0054] Specifically, one end of the sleeve is provided with an internal screw hole, and one end of the connecting part is provided with an external screw thread section which is threadedly connected with the internal screw hole.

[0055] In the embodiment, the internal screw hole 21 is arranged at one end of the sleeve of the connecting sleeve, and the external screw thread section 22 is arranged at one end of the connecting part. The detachable fixed connection of the two is realized through the screwing of the screw pair. Different sizes of sleeves can be replaced to adapt to different sizes and shapes of drill bits.

[0056] Skilled persons should know that although the utility model has been described according to the above specific embodiments, the utility model idea is not limited to the utility model, and any modification using the utility model idea will be included in the patent protection range.

Claims

1. A quick-connect drill bit coupling, characterized in that... The utility model relates to a self-tightening structure of drill bit, including: The connecting sleeve has a connecting part at one end for connecting with an electric drill, and at least three self-tightening structures are arranged at intervals in the sleeve at the other end, the self-tightening structure comprises an arc-shaped bottom groove and a tightening slope, and the tightening slope is arranged on one side in the rotating direction of the electric drill; A rotating sleeve is arranged at intervals on the outer wall of the rotating sleeve, and the rotating groove is matched with the self-tightening structure; A tightening column is provided with a connecting port at one end, the tightening column is rotatably connected with the rotating groove, and the outer edge of the tightening column can protrude from the side walls of the rotating groove; An elastic pre-tightening member is arranged to rotate the rotating sleeve and the tightening column to one side of the tightening slope.

2. The drill bit quick sub of claim 1, wherein: One end of the elastic pre-tightening member is connected with the first connecting hole on the rotating sleeve, and the other end is connected with the second connecting hole on the sleeve.

3. The drill bit quick sub of claim 1, wherein: The elastic pre-tightening member is provided with two elastic pre-tightening members arranged at both ends of the rotating sleeve.

4. The drill bit quick sub of claim 1, wherein: A rotating cover is further arranged to rotate with one end of the connecting sleeve, the rotating cover is provided with a connecting hole in the middle, one end of the rotating sleeve is provided with a connecting end connected with the connecting hole, and the connecting hole and the connecting end are provided with limiting surfaces to prevent the relative rotation of the connecting end and the connecting hole.

5. The drill bit quick sub of claim 1, wherein: The rotating groove is provided with a transverse groove between the rotating grooves, the outer wall of the middle part of the tightening column is provided with a ring-shaped groove, and the transverse groove and the ring-shaped groove are provided with a supporting elastic ring.

6. The drill bit quick sub of claim 1, wherein: The outer wall of the tightening column is provided with a friction-increasing concave line.

7. The drill bit quick sub of claim 1, wherein: One end of the sleeve is provided with an internal screw hole, and one end of the connecting part is provided with an external thread segment for thread connection with the internal screw hole.

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