Quick-change impact drill bit

Abstract

The utility model discloses a kind of impact drill bits of quick replacement, including drill bit positioning seat, the flange of one end of drill bit positioning seat is connected on impact electric drill, the other end of drill bit positioning seat is rotatably connected with drill bit mounting seat, the part of drill bit mounting seat exposing drill bit positioning seat is inserted with drill bit body, the part of drill bit mounting seat in drill bit positioning seat is fixed with driving shaft, the output end of driving shaft is connected with impact electric drill, limit component is installed on drill bit mounting seat, locking assembly for driving limit component limit drill bit body is installed on drill bit positioning seat, screw sleeve, sleeve is moved in the process of thread rotation along drill bit positioning seat outer wall, drive connecting block to move downwards, so that inclined plane extrudes inclined block, locking block can be embedded in outer concave ring, can hinder connecting column to come out of drill bit mounting seat, reverse rotation sleeve, under the elastic force of reset spring, locking block will automatically separate from outer concave ring.

Description

Technical Field

[0001] This utility model relates to the field of drill bit technology, and in particular to an impact drill bit that can be quickly replaced. Background Technology

[0002] An impact drill bit is a drill bit specifically designed for impact drills. It is mainly used for drilling holes in hard materials such as concrete, granite, and brick walls. It is often used to install fasteners such as expansion bolts and plastic expansion tubes. An impact drill bit consists of a drill tip, a spiral groove, and a clamping section. The drill tip is mostly made of tungsten carbide alloy.

[0003] Chinese Patent Publication No. CN215966499U discloses an alloy drill bit that is easy to install and disassemble, including a drill bit and a drill rod. The bottom of the drill rod is provided with an installation groove. The top of the drill bit is connected to the inside of the installation groove through a first installation mechanism and a second installation mechanism. A limiting mechanism is provided between the first installation mechanism and the installation groove. When installing the drill bit with the drill rod, the operator only needs to first thread the threaded column into the threaded hole b, and then rotate the threaded rod by the handle to make the threaded rod drive the clamping plate to move in opposite directions and clamp the hexagonal prism, thereby achieving the purpose of installing the drill bit with the drill rod. Similarly, the drill bit and drill rod can be disassembled by reversing the operation. The structure is reasonably designed and has the function of facilitating the disassembly and assembly of the drill bit and drill rod, saving time and effort, making it convenient for users to use, and improving production efficiency.

[0004] The aforementioned technology uses a threaded rod to drive the clamping plates to move in opposite directions to hold and fix the drill bit. This requires repeating the operation process twice during disassembly and assembly, which is not conducive to quick drill bit replacement. Furthermore, the clamping plates have a dual function of limiting and transmitting torque, and long-term impact can easily lead to structural wear. Therefore, this utility model discloses a quick-replaceable impact drill bit to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a quick-change impact drill bit to solve the technical problems mentioned in the background art. The traditional technology uses a threaded rod to drive the clamping plates to move in opposite directions to hold and fix the drill bit. The disassembly and assembly process needs to be repeated twice, which is not conducive to quick drill bit replacement. In addition, the clamping plates have the dual function of limiting and transmitting torque, and long-term impact can easily lead to structural wear.

[0006] To achieve the above objectives, the present invention provides the following solution to the aforementioned technical problems: a quick-change impact drill bit, comprising a drill bit positioning seat, one end of which is flanged and connected to an impact drill, and the other end of which is rotatably connected to a drill bit mounting seat. A drill bit body is inserted into the portion of the drill bit mounting seat that protrudes from the drill bit positioning seat. A drive shaft is fixed to the portion of the drill bit mounting seat located within the drill bit positioning seat. The drive shaft is connected to the output end of the impact drill. A limit component is installed on the drill bit mounting seat, and a locking component is installed on the drill bit positioning seat to drive the limit component and limit the drill bit body.

[0007] As a further embodiment of this utility model, the drill bit mounting base is provided with a mounting groove on the side away from the drill bit positioning base, and a spline groove is provided on the inner end face of the mounting groove.

[0008] As a further embodiment of this utility model, the limiting component includes a plurality of first countersunk grooves provided on the inner wall of the mounting groove and a plurality of second countersunk grooves provided on the outer wall of the mounting groove. Adjacent first countersunk grooves and second countersunk grooves are located on the same straight line, and a movable rod is connected through the first countersunk grooves and second countersunk grooves. A locking block is fixedly connected to one end of the movable rod located in the first countersunk groove, and a inclined pressure block is fixedly connected to one end of the movable rod located in the second countersunk groove. A return spring is sleeved on the outside of the movable rod and located between the second countersunk groove and the locking block.

[0009] As a further embodiment of this utility model, a connecting post is fixedly connected to one end of the drill bit body, and an outer concave ring for adapting to the locking block is provided on the outer side of the connecting post, and a spline post for adapting to the spline groove is provided at the end of the connecting post away from the drill bit body.

[0010] As a further embodiment of this utility model, the locking assembly includes guide grooves located on both sides of the drill bit positioning seat, an adjusting sleeve slidably embedded inside the drill bit positioning seat, and a sleeve threadedly connected to the outer wall of the drill bit positioning seat. Two connecting blocks are fixedly connected to the outer wall of the adjusting sleeve, and the two connecting blocks are set through the guide grooves. The inner wall of the sleeve is provided with an inner concave ring adapted to the connecting blocks.

[0011] As a further embodiment of this utility model, a receiving groove is provided on one side of the adjusting sleeve, and a sloping surface is provided on the inner wall of the edge of the receiving groove, and the sloping surface is in contact with the inclined pressure block.

[0012] As a further embodiment of this utility model, the end of the drive shaft away from the drill bit positioning seat passes through the adjusting sleeve and the drill bit positioning seat in sequence and is inserted into the output end of the impact drill.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model provides a quick-change impact drill bit. When the sleeve is turned, it rotates along the thread on the outer wall of the drill bit positioning seat, causing the connecting block to move downward. This causes the inclined surface to press against the inclined pressure block, and the locking block is embedded in the outer concave ring, which can prevent the connecting column from coming out of the drill bit mounting seat. When the sleeve is rotated in the opposite direction, the locking block will automatically disengage from the outer concave ring under the elastic force of the return spring, making it easy to disassemble and assemble the drill bit body.

[0015] 2. This utility model provides a quick-change impact drill bit. The spline groove and spline column can smoothly transmit torque, enabling the impact drill bit to rotate at high speed. Furthermore, through high-precision spline connection, the torque transmission efficiency is close to 100%, avoiding the sliding wear problem of traditional hexagonal shank or round shank. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0017] Figure 1 This is an external view of a quick-change impact drill bit according to the present invention;

[0018] Figure 2 This is a cross-sectional view of a quick-change impact drill bit according to the present invention.

[0019] Figure 3 This utility model provides a quick-change impact drill bit attachment Figure 2 Enlarged view of the structure at point A in the image;

[0020] Figure 4 This is a cross-sectional view of the adjusting sleeve in a quick-change impact drill bit according to this utility model.

[0021] The components represented by each number in the attached diagram are listed below: 1. Drill bit positioning seat; 2. Drill bit mounting seat; 3. Drill bit body; 4. Drive shaft; 5. Limiting assembly; 6. Locking assembly; 21. Mounting groove; 22. Spline groove; 31. Connecting post; 32. Outer concave ring; 33. Spline post; 51. First countersunk groove; 52. Second countersunk groove; 53. Movable rod; 54. Locking block; 55. Inclined pressure block; 56. Return spring; 61. Guide groove; 62. Adjusting sleeve; 63. Inner concave ring; 64. Sleeve; 65. Connecting block; 66. Sloping surface. Detailed Implementation

[0022] The present invention will be further described below with reference to the embodiments.

[0023] Please see Figures 1-4 This utility model provides a quick-change impact drill bit, including a drill bit positioning seat 1. One end of the drill bit positioning seat 1 is flanged and connected to the impact drill, and the other end of the drill bit positioning seat 1 is rotatably connected to a drill bit mounting seat 2.

[0024] Specifically, a flange is fixed to the end of the drill bit positioning seat 1. The flange can be fixed to the end screw of the impact drill, thereby fixing the drill bit positioning seat 1. The drill bit positioning seat 1 and the drill bit mounting seat 2 are connected by a bearing, which can reduce friction.

[0025] Furthermore, the drill bit body 3 is inserted into the part of the drill bit mounting base 2 that is exposed from the drill bit positioning base 1. The drill bit mounting base 2 is provided with a mounting groove 21 on the side away from the drill bit positioning base 1. A spline groove 22 is provided on the inner end face of the mounting groove 21.

[0026] Specifically, the mounting groove 21 is adapted to the connecting post 31, and the spline groove 22 is adapted to the spline post 33, which plays the role of transmitting torque.

[0027] Furthermore, a connecting post 31 is fixedly connected to one end of the drill bit body 3. An outer concave ring 32 for adapting to the locking block 54 is provided on the outer side of the connecting post 31. A spline post 33 for adapting to the spline groove 22 is provided at the end of the connecting post 31 away from the drill bit body 3.

[0028] Specifically, the rotational power of the impact drill is transmitted to the drill bit body 3 through the cooperation of the spline column 33 and the spline groove 22, which prevents the drill bit from slipping during high-speed impact. Compared with the use of hexagonal shank or round shank, the problem of sliding wear can be avoided. It is worth noting that the cooperation between the spline column 33 and the spline groove 22 plays the role of transmitting torque and does not bear the axial limiting force, thus reducing the stress on the spline column 33.

[0029] Furthermore, the portion of the drill bit mounting base 2 located inside the drill bit positioning base 1 is fixed with a drive shaft 4. The drive shaft 4 is connected to the output end of the impact drill. The end of the drive shaft 4 away from the drill bit positioning base 1 passes through the adjusting sleeve 62 and the drill bit positioning base 1 in sequence and is inserted into the output end of the impact drill.

[0030] Specifically, a shaped groove is designed on the end face of the drive shaft 4 away from the drill bit positioning seat 1. This shaped groove is adapted to the output end of the impact drill, so that the drive shaft 4 can both transmit torque and provide coaxial support for the adjusting sleeve 62, ensuring structural stability during rotation.

[0031] Furthermore, a limiting component 5 is installed on the drill bit mounting base 2. The limiting component 5 includes a plurality of first countersunk grooves 51 provided on the inner wall of the mounting groove 21 and a plurality of second countersunk grooves 52 provided on the outer wall of the mounting groove 21. Adjacent first countersunk grooves 51 and second countersunk grooves 52 are located on the same straight line, and a movable rod 53 is connected through the first countersunk grooves 51 and the second countersunk grooves 52. A locking block 54 is fixedly connected to one end of the movable rod 53 located in the first countersunk groove 51, and a inclined pressure block 55 is fixedly connected to one end of the movable rod 53 located in the second countersunk groove 52. A return spring 56 is sleeved on the outside of the movable rod 53 and between the second countersunk groove 52 and the locking block 54.

[0032] Specifically, the first countersunk groove 51 guides the locking block 54, the second countersunk groove 52 guides the inclined pressure block 55, and the return spring 56 provides support for the inclined pressure block 55. In the absence of external force, the locking block 54 is embedded in the first countersunk groove 51 and will not affect the assembly and disassembly of the drill bit body 3. It is worth noting that the outer wall of the locking block 54 gradually narrows from the middle to both ends, which can form a curved surface structure that is conducive to the compression displacement of the connected column 31. One side of the locking block 54 is provided with a tangent with the slope of the inclined surface 66, so that the contact area between the locking block 54 and the inclined surface 66 is large.

[0033] Furthermore, a locking component 6 is installed on the drill bit positioning seat 1 to drive the limiting component 5 to limit the drill bit body 3. The locking component 6 includes guide grooves 61 located on both side walls of the drill bit positioning seat 1, an adjusting sleeve 62 slidably embedded inside the drill bit positioning seat 1, and a sleeve 64 threadedly connected to the outer wall of the drill bit positioning seat 1. Two connecting blocks 65 are fixedly connected to the outer wall of the adjusting sleeve 62. The two connecting blocks 65 are set through the guide grooves 61. The inner wall of the sleeve 64 is provided with an inner concave ring 63 adapted to the connecting blocks 65. A receiving groove is provided on one side of the adjusting sleeve 62. A slope surface 66 is provided on the inner wall of the edge of the receiving groove. The slope surface 66 is in contact with the inclined pressure block 55.

[0034] Specifically, when the sleeve 64 rotates downward, the adjusting sleeve 62 is driven to move axially by the connecting block 65. During the movement, the ramp surface 66 presses against the inclined surface of the inclined pressure block 55, converting the axial force into a radial force, which pushes the movable rod 53 to move inward, causing the locking block 54 to engage with the outer concave ring 32 of the drill bit body 3. When the sleeve 64 rotates in the opposite direction, the adjusting sleeve 62 moves upward, the ramp surface 66 disengages from the inclined pressure block 55, and the return spring 56 pulls the inclined pressure block 55 and the locking block 54 back, releasing the lock. It is worth noting that the inclination angle of the ramp surface 66 is in the range of 30°-45°, which can optimize the mechanical transmission efficiency and avoid jamming.

[0035] Working principle: In use, first insert the connecting post 31 of the drill bit body 3 into the drill bit mounting seat 2, and the spline post 33 is embedded in the spline groove 22. Then, turn the sleeve 64. As the sleeve 64 rotates along the thread on the outer wall of the drill bit positioning seat 1, it drives the connecting block 65 to move down. The inclined surface 66 squeezes the inclined pressure block 55, which compresses the return spring 56. The locking block 54 is embedded in the outer concave ring 32, which can prevent the connecting post 31 from coming out of the drill bit mounting seat 2. After tightening the sleeve 64, start the impact drill. The output end of the impact drill drives the drill bit mounting seat 2 to rotate through the drive shaft 4. The spline groove 22 and the spline post 33 cooperate to smoothly transmit torque, so that the drill bit body 3 can rotate at high speed.

Claims

1. A quick-change impact drill bit, comprising a drill bit positioning seat (1), one end of which is flanged and connected to an impact drill, and the other end of which is rotatably connected to a drill bit mounting seat (2), wherein a drill bit body (3) is inserted into the portion of the drill bit mounting seat (2) protruding from the drill bit positioning seat (1), and a drive shaft (4) is fixed to the portion of the drill bit mounting seat (2) located inside the drill bit positioning seat (1), the drive shaft (4) being connected to the output end of the impact drill, characterized in that, A limiting component (5) is installed on the drill bit mounting base (2), and a locking component (6) is installed on the drill bit positioning base (1) to drive the limiting component (5) to limit the drill bit body (3).

2. The quick-change impact drill bit according to claim 1, characterized in that: The drill bit mounting base (2) has a mounting groove (21) on the side away from the drill bit positioning base (1), and a spline groove (22) is provided on the inner end face of the mounting groove (21).

3. The quick-change impact drill bit according to claim 2, characterized in that: The limiting component (5) includes a plurality of first countersunk grooves (51) provided on the inner wall of the mounting groove (21) and a plurality of second countersunk grooves (52) provided on the outer wall of the mounting groove (21). The adjacent first countersunk grooves (51) and second countersunk grooves (52) are located on the same straight line, and a movable rod (53) is connected through the first countersunk grooves (51) and the second countersunk grooves (52). A locking block (54) is fixedly connected to one end of the movable rod (53) located in the first countersunk groove (51), and a inclined pressure block (55) is fixedly connected to one end of the movable rod (53) located in the second countersunk groove (52). A return spring (56) is sleeved on the outside of the movable rod (53) and between the second countersunk groove (52) and the locking block (54).

4. The quick-change impact drill bit according to claim 3, characterized in that: One end of the drill bit body (3) is fixedly connected to a connecting post (31), and the outer side of the connecting post (31) is provided with an outer concave ring (32) for adapting to the locking block (54). The end of the connecting post (31) away from the drill bit body (3) is provided with a spline post (33) for adapting to the spline groove (22).

5. The quick-change impact drill bit according to claim 4, characterized in that: The locking assembly (6) includes guide grooves (61) on both sides of the drill bit positioning seat (1), an adjusting sleeve (62) slidably embedded inside the drill bit positioning seat (1), and a sleeve (64) threadedly connected to the outer wall of the drill bit positioning seat (1). The outer wall of the adjusting sleeve (62) is fixedly connected to two connecting blocks (65), which protrude from the guide grooves (61). The inner wall of the sleeve (64) is provided with an inner concave ring (63) that matches the connecting blocks (65).

6. The quick-change impact drill bit according to claim 5, characterized in that: The adjusting sleeve (62) has a receiving groove on one side, and the inner wall of the edge of the receiving groove has a slope surface (66), which is in contact with the inclined pressure block (55).

7. The quick-change impact drill bit according to claim 5, characterized in that: The end of the drive shaft (4) away from the drill bit positioning seat (1) passes through the adjusting sleeve (62) and the drill bit positioning seat (1) in sequence and is inserted into the output end of the impact drill.

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