A hard metal drill bit

Abstract

The utility model discloses a hard alloy drill bit belongs to drill bit technical field, include: the first end part of connection is established with first connecting recess and a plurality of first screw hole, the first end part of first section drill body is established with second connecting recess, and the second end part is provided with first connecting boss, first connecting boss is established with third screw hole, and third screw hole extends to and communicates with second connecting recess, the second end part of second section drill body is provided with the second connecting boss of adaptation with second connecting recess, and the second end part of second connecting boss is established with the fourth screw hole of adaptation with third screw hole. The first screw hole is cooperated with first screw, and the third screw hole is cooperated with second screw. The utility model discloses a screw and first section drill body and second section drill body can be detachably connected together, and the structure is simple, and the assembly is convenient, and, through the non - circular connecting recess and connecting boss, realize the torque transmission, avoid the screw to bear the torsion, improve the strength and stability of drill bit.

Description

Technical Field

[0001] This utility model relates to the field of drill bit technology, specifically to a cemented carbide drill bit. Background Technology

[0002] Existing carbide drill bits typically employ a segmented design for the drill body. This segmented structure can reduce operating costs to some extent and facilitate maintenance or replacement of failed sections. In existing technologies, the connection between the two drill body sections is achieved through welding. While this welding connection initially ensures the structural integrity and torque transmission stability of the drill body, it has significant technical drawbacks in practical applications: Firstly, the welded connection is a non-removable fixed structure. When the carbide working section of the drill bit fails due to wear, chipping, or other issues and needs replacement, the failed section cannot be separated, necessitating the disposal of the entire drill bit. This not only wastes the still-usable base connection section, significantly increasing user costs, but also leads to resource waste and environmental pressure due to increased discarded drill bits. Secondly, if the base connection section experiences localized faults such as thread damage, it also cannot be replaced individually and must be scrapped entirely, further exacerbating operating costs. Therefore, this utility model includes a carbide drill bit. Utility Model Content

[0003] The purpose of this invention is to provide a cemented carbide drill bit.

[0004] To solve the above-mentioned technical problems, the purpose of this utility model is achieved as follows: A carbide drill bit includes: a connecting part, wherein a first connecting groove is provided at a first end of the connecting part along its axial direction, and a plurality of first screw holes are provided in the first connecting groove in the circumferential direction along its radial direction, wherein the first screw holes extend inward from the outer wall of the connecting part to communicate with the first connecting groove. The first section of the drill body has a second connecting groove along its axial direction at its first end and a first connecting protrusion at its second end. The first connecting protrusion is adapted to the first connecting groove and has a plurality of second screw holes that correspond one-to-one with the first screw holes. The end of the first connecting protrusion is recessed inward to form an installation groove, and a third screw hole is formed at the bottom of the installation groove. The third screw hole extends to communicate with the second connecting groove. The second section of the drill body has a second connecting protrusion at its second end that is adapted to the second connecting groove, and a fourth threaded hole at the end of the second connecting protrusion that is adapted to the third threaded hole. The cross-sectional shapes of the first connecting groove and the second connecting groove are not circular; A first screw is fitted into the first screw hole, and the first screw fits into the second screw hole; a second screw is fitted into the third screw hole, and the second screw fits into the fourth screw hole.

[0005] Based on the above scheme and as a preferred embodiment of the above scheme, the cross-sectional shapes of the first connecting groove and the second connecting groove are regular polygons.

[0006] Based on the above scheme and as a preferred embodiment of the above scheme, the number of the first screw holes is equal to the number of sides of the first connecting groove cross section, and they are evenly distributed along the circumference of the connecting portion.

[0007] Based on the above scheme and as a preferred embodiment of the above scheme, a settling hole is provided at the end of the first screw hole.

[0008] Based on the above scheme and as a preferred embodiment of the above scheme, the cross-section of the mounting groove is a regular polygon.

[0009] Based on the above scheme and as a preferred embodiment of the above scheme, a settling hole corresponding to the third screw hole is provided in the mounting groove.

[0010] Based on the above solution and as a preferred embodiment of the above solution, the first connecting groove is provided with an insertion protrusion that matches the mounting groove.

[0011] Compared with the prior art, this utility model has the following advantages and beneficial effects: the first section of the drill body and the second section of the drill body are detachably connected together by screws, which is simple in structure and easy to assemble; in addition, torque transmission is achieved by non-circular connecting grooves and connecting protrusions, avoiding the screws from bearing torque and improving the strength and stability of the drill bit. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 This is a cross-sectional view of the present invention.

[0014] Figure 3 This is an exploded view of the present invention.

[0015] Figure 4 This is a schematic diagram of the connecting part and the first screw structure of this utility model.

[0016] Figure 5 This is a schematic diagram of the first section of the drill body and the second screw structure of this utility model.

[0017] Figure 6 This is a schematic diagram of the first and second sections of the drill body of this utility model.

[0018] In the figure: 1. Connecting part; 2. First connecting groove; 3. First screw hole; 4. First section of drill body; 5. Second connecting groove; 6. First connecting protrusion; 7. Second screw hole; 8. Mounting groove; 9. Third screw hole; 10. Second section of drill body; 11. Second connecting protrusion; 12. Fourth screw hole; 13. First screw; 14. Second screw; 15. Insertion protrusion. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solution of this utility model, the preferred embodiments of this utility model are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. For better illustration of this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0020] like Figure 1 and Figure 2 As shown, a cemented carbide drill bit includes: a connecting part 1, a first drill body 4, and a second drill body 10.

[0021] Among them, such as Figure 4 As shown, the first end of the connecting part 1 is provided with a first connecting groove 2 along its axial direction, and a plurality of first screw holes 3 along its radial direction are provided around the first connecting groove 2. The first screw holes 3 extend from the outer wall of the connecting part 1 inward to communicate with the first connecting groove 2.

[0022] Preferably, the cross-sectional shape of the first connecting groove 2 is a regular hexagon, and the number of the first screw holes 3 is six, which are evenly distributed around the circumference of the connecting part 1 and correspond one-to-one with each side of the first connecting groove 2.

[0023] like Figure 3 and Figure 6 As shown, the first end of the first section of the drill body 4 has a second connecting groove 5 along its axial direction, and the second end has a first connecting protrusion 6. The first connecting protrusion 6 is adapted to the first connecting groove 2, and has several second screw holes 7 corresponding one-to-one with the first screw holes 3. When the first connecting protrusion 6 is inserted into the first connecting groove 2, the first screw holes 3 and the second screw holes 7 form a single screw hole, in which a first screw 13 is fitted to achieve a detachable and fixed connection between the first section of the drill body 4 and the connecting part 1.

[0024] Meanwhile, a settling hole is provided at the end of the first screw hole 3, and the head of the first screw 13 fits into the settling hole to prevent the first screw 13 from protruding from the outer wall of the connecting part 1.

[0025] like Figure 5 As shown, the first connecting protrusion 6 has an inwardly recessed mounting groove 8 at its end, and a third screw hole 9 is provided at the bottom of the mounting groove 8. The third screw hole 9 extends through the first section of the drill body 4 and communicates with the second connecting groove 5.

[0026] The cross-section of the mounting groove 8 is a regular polygon, preferably a regular hexagon.

[0027] The second end of the second section of the drill body 10 is provided with a second connecting protrusion 11 that matches the second connecting groove 5. The end of the second connecting protrusion 11 has a fourth threaded hole 12 that matches the third threaded hole 9. The cross-section of the second connecting groove 5 is a regular hexagon, and the cross-section of the second connecting protrusion 11 is also a regular hexagon, which can prevent relative rotation after the first section of the drill body 4 and the second section of the drill body 10 are connected. The fourth threaded hole 12 can extend into the second section of the drill body 10.

[0028] The fourth screw hole 12 and the third screw hole 9 are connected together to form an integral screw hole. The second screw 14 is fitted inside the integral screw hole to realize the detachable and fixed connection between the first section of the drill body 4 and the second section of the drill body 10. A settlement hole corresponding to the third screw hole 9 is opened in the mounting groove 8. When connected, the head of the second screw 14 is located in the settlement hole.

[0029] The first connecting groove 2 is provided with an insertion protrusion 15 that matches the mounting groove 8. When the first section of the drill body 4 is connected to the connecting part 1, the first connecting protrusion 6 is inserted into the first connecting groove 2, and at the same time, the insertion protrusion 15 is inserted into the mounting groove 8, which restricts the second screw 14 in the settling hole and prevents the second screw 14 from loosening.

[0030] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A cemented carbide drill bit, characterized in that, include: The connecting part (1) has a first connecting groove (2) along its axial direction at its first end, and a plurality of first screw holes (3) along its radial direction are provided in the first connecting groove (2) around its circumference. The first screw holes (3) extend inward from the outer wall of the connecting part (1) to communicate with the first connecting groove (2). The first section of the drill body (4) has a second connecting groove (5) along its axial direction at its first end and a first connecting protrusion (6) at its second end. The first connecting protrusion (6) is adapted to the first connecting groove (2) and has a plurality of second screw holes (7) corresponding one-to-one with the first screw hole (3). The end of the first connecting protrusion (6) is recessed inward to form an installation groove (8). The bottom of the installation groove (8) has a third screw hole (9) that extends to communicate with the second connecting groove (5). The second section of the drill body (10) has a second connecting protrusion (11) at its second end that is adapted to the second connecting groove (5), and a fourth screw hole (12) at the end of the second connecting protrusion (11) that is adapted to the third screw hole (9). The cross-sectional shapes of the first connecting groove (2) and the second connecting groove (5) are not circular; The first screw (13) is fitted in the first screw hole (3), and the first screw (13) is fitted in the second screw hole (7); the second screw (14) is fitted in the third screw hole (9), and the second screw (14) is fitted in the fourth screw hole (12).

2. A carbide drill bit according to claim 1, characterized in that, The cross-sectional shape of the first connecting groove (2) and the second connecting groove (5) is a regular polygon.

3. A carbide drill bit according to claim 2, characterized in that, The number of the first screw holes (3) is equal to the number of sides of the first connecting groove (2) cross section, and they are evenly distributed along the circumference of the connecting part (1).

4. A cemented carbide drill bit according to claim 1, characterized in that, The first screw hole (3) has a settling hole at its end.

5. A cemented carbide drill bit according to claim 1, characterized in that, The cross-section of the mounting groove (8) is a regular polygon.

6. A carbide drill bit according to claim 1, characterized in that, The mounting groove (8) is provided with a settling hole corresponding to the third screw hole (9).

7. A carbide drill bit according to claim 1, characterized in that, The first connecting groove (2) is provided with an insertion protrusion (15) that is adapted to the mounting groove (8).

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