Post-pulling type combined drill bit

Abstract

The utility model relates to the technical field of combined drill bits, in particular to a rear-pulling type combined drill bit which prevents generated scraps from being too long and wound on the surface of a drill rod, improves use convenience and improves machining efficiency. Comprising a drill rod and a chip groove, and the chip groove is formed in the outer side wall of the drill rod; the tool bit fixing groove is formed in the top end of the drill rod, the lower portion of the tool bit is embedded into the tool bit fixing groove, the connecting assembly is arranged between the drill rod and the tool bit, the connecting assembly is used for fixedly connecting the drill rod and the tool bit, and the two alloy blades are installed at the end of the drill rod through the fixing assembly. The fixing assembly is used for positioning the two sets of alloy blades, and one side of the two sets of alloy blades exceeds the outer side wall of the drill rod to serve as a cutting part.

Description

Technical Field

[0001] This utility model relates to the technical field of combined drill bits, and in particular to pull-back combined drill bits. Background Technology

[0002] Traditional drill bits, due to their relatively simple structural design, have cutting edge layouts and shapes that are difficult to adapt to the complex changes in different geological conditions, resulting in slow drilling speeds and increased construction time and costs. Furthermore, when drilling into soft materials, unreasonable cutting edge design may cause material to clog the drill bit, further reducing drilling efficiency.

[0003] For example, the prior art patent with authorization announcement number CN206200197U discloses a cubic boron nitride spiral drill bit, including a spiral drill bit body. The spiral drill bit body includes a clamping part, a cutting part connected to one end of the clamping part, and a drill tip disposed at the front end of the cutting part. The clamping part, the cutting part, and the drill tip rotate along the same central axis. The cutting part and the drill tip are provided with spiral grooves for chip removal. The spiral grooves smoothly transition from the drill tip to the cutting part. The drill tip is made of polycrystalline cubic boron nitride material. The drill tip is welded and fixedly connected to the cutting part.

[0004] However, it was found during the use of this drill bit that its structural design was relatively simple, which reduced its effectiveness. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a pull-back combined drill bit that avoids excessively long debris from wrapping around the drill rod surface, thereby improving ease of use and processing efficiency.

[0006] This utility model discloses a pull-back combined drill bit, comprising a drill rod and a chip removal groove, the chip removal groove being disposed on the outer wall of the drill rod; it also includes a connecting component, a fixing component, alloy cutting inserts, a cutting head, and a cutting head fixing groove. The cutting head fixing groove is disposed at the top of the drill rod, and the lower part of the cutting head is embedded in the cutting head fixing groove. A connecting component is provided between the drill rod and the cutting head, which is used to fix the drill rod and the cutting head together. Two alloy cutting inserts are mounted on the end of the drill rod through the fixing component, which is used to position the two alloy cutting inserts, and one side of each alloy cutting insert extends beyond the outer wall of the drill rod as a cutting section. When the drill bit rotates, the drill rod drives the cutting head to rotate through the cutting head fixing groove, and at the same time, the drill rod drives the two alloy cutting inserts to move circumferentially, so that the cutting head and the two alloy cutting inserts cooperate to drill the material. Afterwards, the chip removal groove discharges the drilled chips to the surrounding area, and one side of each alloy cutting insert cuts the generated chips, thereby preventing the generated chips from being too long and wrapping around the surface of the drill rod, improving ease of use and processing efficiency.

[0007] Preferably, the connecting assembly includes a first internal threaded hole, a second internal threaded hole, and a screw. The first internal threaded hole is located at the top of the drill rod, and the second internal threaded hole is located at the bottom of the cutter head. The positions of the first internal threaded hole and the second internal threaded hole correspond. The upper part of the screw is screwed onto the second internal threaded hole, and the lower part of the screw is screwed onto the first internal threaded hole. An operating through hole is provided on the drill rod. The lower part of the screw is screwed onto the first internal threaded hole, and then the cutter head is screwed onto the upper part of the screw through the second internal threaded hole, thereby fixing the cutter head and the drill rod together. At the same time, the lower part of the cutter head is limited by the cutter head fixing groove, thereby improving the stability of the cutter head. When it is necessary to tighten the cutter head, a special wrench is used to tighten the screw through the operating through hole on the drill rod, so that the cutter head 3 forms a downward compressive force, improving the convenience of the cutter head installation and tightening.

[0008] Preferably, the fixing component includes a mounting groove, a third internal threaded hole, and a bolt. The mounting groove is located on the outer wall of the drill pipe, and the third internal threaded hole is located in the mounting groove. The alloy cutting tool is embedded in the mounting groove, and the bolt passes through the alloy cutting tool and is screwed into the third internal threaded hole. The alloy cutting tool is installed in the mounting groove, and then the alloy cutting tool is fixed by the bolt engaging with the third internal threaded hole, thereby improving the connection between the alloy cutting tool and the drill pipe and improving the stability of the alloy cutting tool in use.

[0009] Preferably, it also includes a clamping angle, with 153-155 degree clamping angles provided on both sides of the inner sidewall of the cutter head fixing groove, and the clamping angles are S-shaped in general, and a groove matching the clamping angles is provided at the lower part of the cutter head; to improve the stability of the cutter head installation and positioning.

[0010] Preferably, the chip removal groove is manufactured using the traditional fully ground twist drill production process; the grinding process retains the traditional advantages of twist drills in chip removal, ensuring smooth chip removal, and the use of grinding wheels in the manufacturing process greatly reduces the production cycle, thus reducing the tool usage cost compared to the traditional machining center milling process.

[0011] Preferably, a guide hole is provided inside the drill rod, the guide hole penetrates the inside of the drill rod, the inlet of the guide hole is located at the end of the drill rod, and the outlet of the guide hole is located at the beginning of the drill rod; this improves the convenience of transporting cutting fluid inside the drill rod.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: when the drill rod is rotated by the drill rig, the drill rod drives the cutter head to rotate through the cutter head fixing groove. At the same time, the drill rod drives the two sets of gold blades to move circumferentially, so that the cutter head and the two sets of gold blades cooperate to drill the material. Then, the chips from the drilling are discharged to the surrounding area through the chip removal groove. At the same time, the chips generated are cut by one side of the two sets of gold blades, thereby avoiding the generated chips from being too long and wrapping around the surface of the drill rod, improving the convenience of use and improving the processing efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the isometric structure of this utility model;

[0014] Figure 2 This is a partial isometric schematic diagram of the drill rod and cutter head fixing groove, etc.

[0015] Figure 3 This is a partial isometric view of the cutting head and the second internal threaded hole, etc.

[0016] Figure 4 This is a partial isometric schematic diagram of the cutter head fixing groove and clamping angle, etc.

[0017] Figure 5 This is a partial isometric schematic diagram of the alloy blade and bolt structures.

[0018] The following are labels in the attached diagram: 1. Drill rod; 2. Carbide insert; 3. Cutting head; 4. Cutting head fixing groove; 5. First internal threaded hole; 6. Second internal threaded hole; 7. Screw; 8. Mounting groove; 9. Third internal threaded hole; 10. Bolt; 11. Clamping angle; 12. Chip removal groove. Detailed Implementation

[0019] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete. Example 1

[0020] like Figures 1 to 5 As shown, the pull-back combined drill bit of this utility model includes a drill rod 1 and a chip removal groove 12, which is disposed on the outer side wall of the drill rod 1; it also includes a connecting component, a fixing component, alloy cutting blades 2, a cutting head 3, and a cutting head fixing groove 4. The cutting head fixing groove 4 is disposed at the top of the drill rod 1, and the lower part of the cutting head 3 is embedded in the cutting head fixing groove 4. A connecting component is disposed between the drill rod 1 and the cutting head 3. The connecting component is used to fix the drill rod 1 and the cutting head 3. Two combined alloy cutting blades 2 are mounted on the end of the drill rod 1 through the fixing component. The fixing component is used to position the two combined alloy cutting blades 2, and one side of the two combined alloy cutting blades 2 extends beyond the outer side wall of the drill rod 1 as a cutting part;

[0021] like Figure 2 and Figure 3 As shown, the connecting assembly includes a first internal threaded hole 5, a second internal threaded hole 6, and a screw 7. The first internal threaded hole 5 is located at the top of the drill rod 1, and the second internal threaded hole 6 is located at the bottom of the cutter head 3. The positions of the first internal threaded hole 5 and the second internal threaded hole 6 are corresponding. The upper part of the screw 7 is screwed onto the second internal threaded hole 6, and the lower part of the screw 7 is screwed onto the first internal threaded hole 5. The drill rod 1 is provided with an operating through hole.

[0022] In this embodiment, when the drill rod 1 rotates, the drill rod 1 drives the cutter head 3 to rotate through the cutter head fixing groove 4. At the same time, the drill rod 1 drives the two sets of gold blades 2 to move circumferentially, so that the cutter head 3 and the two sets of gold blades 2 cooperate to drill holes in the material. Then, the chips from the drilling are discharged to the surrounding area through the chip removal groove 12. At the same time, the chips generated are cut off by one side of the two sets of gold blades 2, thereby preventing the generated chips from being too long and wrapping around the surface of the drill rod 1, improving ease of use and processing efficiency. Example 2

[0023] Based on Example 1, such as Figure 2 As shown, the pull-back combined drill bit of this utility model includes a fixing component comprising a mounting groove 8, a third internal threaded hole 9, and a bolt 10. The mounting groove 8 is provided on the outer wall of the drill rod 1, the third internal threaded hole 9 is provided on the mounting groove 8, the alloy cutting edge 2 is embedded in the mounting groove 8, and the bolt 10 passes through the alloy cutting edge 2 and is screwed onto the third internal threaded hole 9.

[0024] As shown in Figure 1, it also includes a clamping angle 11. The inner sidewall of the cutter head fixing groove 4 is provided with a clamping angle 11 of 153-155 degrees on both sides. The clamping angle 11 is S-shaped in general. The lower part of the cutter head 3 is provided with a groove that matches the clamping angle 11.

[0025] like Figure 1 As shown, the chip removal groove 12 is manufactured using the traditional fully ground twist drill production process;

[0026] like Figure 1 As shown, a flow guide hole is provided inside the drill rod 1, which penetrates the inside of the drill rod 1. The inlet of the flow guide hole is located at the end of the drill rod 1, and the outlet of the flow guide hole is located at the beginning of the drill rod 1.

[0027] In this embodiment, the lower part of the screw 7 is screwed onto the first internal threaded hole 5, and then the cutter head 3 is screwed onto the upper part of the screw 7 through the second internal threaded hole 6, thereby fixing the cutter head 3 to the drill rod 1. At the same time, the lower part of the cutter head 3 is limited by the cutter head fixing groove 4, thereby improving the stability of the cutter head 3. When it is necessary to install and tighten the cutter head 3, the screw 7 is tightened by passing a special wrench through the operating through hole on the drill rod 1, so that the cutter head 3 forms a downward compressive force, improving the convenience of installing and tightening the cutter head 3. The alloy blade 2 is installed on the mounting groove 8, and then the alloy blade 2 is fixed by the bolt 10 cooperating with the third internal threaded hole 9, thereby improving the connection between the alloy blade 2 and the drill rod 1 and improving the stability of the alloy blade 2 in use.

[0028] In operation, the pull-back combined drill bit of this utility model rotates the drill rod 1 through the drill head fixing groove 4, which in turn drives the cutter head 3 to rotate. At the same time, the drill rod 1 drives the two combined gold blades 2 to move circumferentially, so that the cutter head 3 and the two combined gold blades 2 cooperate to drill the material. Then, the chips from the drill hole are discharged to the surrounding area through the chip removal groove 12, and the chips generated are cut off by one side of the two combined gold blades 2.

[0029] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A back-reaming combination drill bit comprising a drill shaft (1) and a chip flute (12) provided on the outer lateral wall of the drill shaft (1); characterized in that, It also includes a connecting component, a fixing component, alloy blades (2), a cutting head (3) and a cutting head fixing groove (4). The cutting head fixing groove (4) is set at the top of the drill rod (1). The lower part of the cutting head (3) is embedded in the cutting head fixing groove (4). A connecting component is provided between the drill rod (1) and the cutting head (3). The connecting component is used to fix the drill rod (1) and the cutting head (3). Two sets of alloy blades (2) are installed at the end of the drill rod (1) through the fixing component. The fixing component is used to position the two sets of alloy blades (2). One side of the two sets of alloy blades (2) extends beyond the outer wall of the drill rod (1) as a cutting part.

2. The back-pull combination drill bit of claim 1, wherein, The connecting assembly includes a first internal threaded hole (5), a second internal threaded hole (6), and a screw (7). The first internal threaded hole (5) is located at the top of the drill rod (1), and the second internal threaded hole (6) is located at the bottom of the cutter head (3). The positions of the first internal threaded hole (5) and the second internal threaded hole (6) are corresponding. The upper part of the screw (7) is screwed onto the second internal threaded hole (6), and the lower part of the screw (7) is screwed onto the first internal threaded hole (5). An operating through hole is provided on the drill rod (1).

3. The back-pull combination drill bit of claim 1, wherein, The fixing assembly includes a mounting groove (8), a third internal threaded hole (9), and a bolt (10). The mounting groove (8) is located on the outer wall of the drill rod (1), the third internal threaded hole (9) is located on the mounting groove (8), the alloy blade (2) is embedded in the mounting groove (8), and the bolt (10) passes through the alloy blade (2) and is screwed onto the third internal threaded hole (9).

4. The back-pull combination drill bit of claim 1, wherein, It also includes a clamping angle (11), and the inner side wall of the cutter head fixing groove (4) is provided with a clamping angle (11) of 153-155 degrees. The clamping angle (11) is S-shaped, and the lower part of the cutter head (3) is provided with a groove that matches the clamping angle (11).

5. The back-pull combination drill bit of claim 1, wherein, The chip removal groove (12) is made using the traditional fully ground twist drill manufacturing process.

6. The back-pull combination drill bit of claim 1, wherein, The drill rod (1) has a flow guide hole inside, which penetrates the inside of the drill rod (1). The inlet of the flow guide hole is located at the end of the drill rod (1), and the outlet of the flow guide hole is located at the beginning of the drill rod (1).

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