Hard rock double-edge cutting drill bit for tungsten ore mining

Abstract

The utility model belongs to the technical field of tungsten ore mining, particularly relates to a hard rock double-edge cutting drill bit for tungsten ore mining, and aims to solve the problems that the conventional drill bit is low in drilling efficiency and quick in abrasion, the load of a single drill bit is concentrated, thermal fatigue is easy to aggravate, the maintenance cost of an integral structure is high, and the cooling coverage is insufficient. Comprising a first drill bit part and a second drill bit part, the first drill bit part is fixedly installed at one end of the second drill bit part, and the outer diameter of the second drill bit part is larger than that of the first drill bit part. The stepped sawtooth blade can shear and crush rock mass, and the reaming precision is improved; the modular connection structure facilitates quick replacement of worn parts; the double-path cooling system covers the whole working face to complete cooling and chip removal. The edge wear-resistant convex balls roll and trim the hole wall, drill jamming can be effectively prevented, and the service life of the drill bit is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of tungsten mining technology, and in particular to a hard rock double-edged cutting drill bit for tungsten mining. Background Technology

[0002] When drilling in hard rock geological conditions such as tungsten mines, traditional drill bits typically employ a single-stage drilling structure, with the cutting edge directly contacting the rock strata and forming a hole through rotational cutting. However, as the drilling depth increases, the frictional resistance between the hole wall and the drill bit increases significantly, leading to decreased drilling efficiency and accelerated drill bit wear. Especially when enlarging the hole diameter is required, traditional drill bits necessitate repeated lifting and lowering of the drill bit to replace the reaming tool, which is cumbersome and increases the risk of hole wall collapse.

[0003] In existing technologies, some drill bits achieve hole enlargement by increasing their outer diameter. However, this design has the following drawbacks: First, a single drill bit must simultaneously undertake both excavation and hole enlargement tasks, resulting in uneven distribution of cutting load and accelerated wear of the cutting edge. Second, during hole enlargement, the contact area between the drill bit and the hole wall increases, heat dissipation conditions deteriorate, and the high-temperature environment exacerbates material thermal fatigue. Third, traditional drill bits adopt an integral structure, and when a local cutting edge wears out, the entire bit needs to be replaced, resulting in high maintenance costs.

[0004] Furthermore, hard rock drilling places stringent requirements on the cooling system. Conventional cooling methods typically deliver water through channels inside the drill pipe, but the water flow path is limited and cannot cover the entire cutting area, easily leading to localized overheating and unsatisfactory drilling results.

[0005] To address the aforementioned issues, this utility model document proposes a hard rock double-edged cutting drill bit for tungsten mining. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies, such as low drilling efficiency and rapid wear of traditional drill bits, concentrated load on a single drill bit which easily exacerbates thermal fatigue, high maintenance costs of integral structures, and insufficient cooling coverage. The proposed invention is a hard rock double-edged cutting drill bit for tungsten mining.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A hard rock double-edged cutting drill bit for tungsten mining includes:

[0009] A first drill head and a second drill head, wherein the first drill head is fixedly connected to one end of the second drill head, and the outer diameter of the second drill head is larger than the outer diameter of the first drill head, wherein the first drill head is used to excavate rock strata to form a hole, and the second drill head is used to expand the hole;

[0010] A filler, placed inside the second drill bit, is used to cut rock strata;

[0011] The connector is fixed inside the second drill head by threads, and one end of it abuts against the filler to fix the filler.

[0012] A water-passing structure is used to introduce water to cool the drill bit;

[0013] During drilling, the first drill bit cuts into the rock strata, the second drill bit then enlarges the hole, the filler material assists in cutting, and the water-conducting structure guides water to reduce the temperature of the drill bit.

[0014] In one possible design, one end of the second drill bit is provided with a conical arc surface, which connects to the first drill bit and has multiple mounting slots; the filler includes a support column and multiple drill bit blades, which are fixed to the outer circumferential wall of the support column. Each drill bit blade has stepped serrated protrusions that penetrate the mounting slots and extend to the outside of the second drill bit to shear and break the rock mass to achieve hole enlargement.

[0015] In one possible design, the connector includes a connecting plug and a connecting tube, with the connecting tube fixed to one end of the connecting plug; the outer wall of the connecting plug is threaded and threaded to the inner wall of the second drill bit, and one end of the connecting plug presses against the drill bit; the inner wall of the connecting tube is threaded for connecting an external drive rod.

[0016] In one possible design, the water passage structure includes a water outlet channel formed inside the first drill head, which passes through the first drill head and connects to the inside of the second drill head; a water delivery channel is formed inside the filler, and one end of the filler is sealed to fit the inner wall of the second drill head, so that the water delivery channel and the water outlet channel are connected; an installation through hole is formed inside the connecting plug, and the support column is sealed and slidably fitted with the inner wall of the installation through hole, and the installation through hole connects to the connecting pipe to introduce an external water source.

[0017] In one possible design, the water-passing structure further includes multiple connecting holes formed on the outer wall of the filler, the multiple connecting holes being located in the gap between adjacent drill bits and all communicating with the water supply channel; the conical arc surface of the second drill head is provided with multiple water outlet holes, the multiple water outlet holes being located between adjacent mounting slots, for discharging water to cool the outside of the drill bit.

[0018] In one possible design, the circumferential edge of the second drill bit is fixedly embedded with multiple wear-resistant protrusions, which are evenly distributed to roll and break the rock mass at the edge of the hole and prevent the drill from getting stuck.

[0019] In one possible design, during drilling, external water flows into the installation through-hole through the connecting pipe, enters the water supply channel through the gap between the support column and the installation through-hole, and part of the water flows out to the front end of the first drill bit through the water outlet channel. The other part is diverted through the connecting hole and sprayed out from the water outlet hole to cover the cutting area and cool it down.

[0020] In one possible design, when subjected to axial load, the connecting plug is threaded to press against the drill bit, keeping the filler in rigid contact with the inner wall of the second drill head; during maintenance, the connecting pipe can be rotated in the opposite direction to remove the connecting plug and take out the filler for replacement.

[0021] In this application, when the drill bit is started, an external drive device rotates the entire drill bit via a connecting pipe. The first drill bit contacts the rock strata first, and its front cutting edge cuts into the hard rock to form an initial hole. As the drilling depth increases, the conical arc surface of the second drill bit contacts the hole wall, at which point the second drill bit, with its larger outer diameter, begins to radially expand the hole. Multiple drill bits fixed to the support column extend from the outer edge of the second drill bit through mounting slots. The stepped serrated protrusions on the surface of the drill bits shear and break the rock mass of the hole wall, achieving continuous hole enlargement.

[0022] During drilling, external water flows into the mounting hole of the connecting plug through the internal channel of the connecting pipe. The water flows into the water delivery channel through the sealing gap between the mounting hole and the support column. This channel guides the water flow to the outlet channel, ensuring it can be discharged through the front end of the first drill bit. It also diverts the water flow through the connecting holes on the outer wall of the filler. The diverted cooling water is then sprayed out through the outlet holes on the conical arc surface of the second drill bit, directly acting on the cutting areas of both the first and second drill bits. Simultaneously, the water flows along the borehole wall, effectively reducing the temperature of the drill bit's cutting section.

[0023] When the drill bit is subjected to axial load, the connecting plug is threaded into the inner cavity of the second drill bit, and its end face continuously presses against the root plane of the drill bit. This pressure is transmitted to the support column, ensuring that the filler material remains in close contact with the inner wall of the second drill bit. The wear-resistant convex balls embedded in the circumferential edge of the second drill bit rotate with the drill bit, generating a rolling and crushing effect on the rock mass at the edge of the hole, preventing stuck drill bit caused by irregular shrinkage of the hole wall.

[0024] When the drill bit needs replacement or maintenance, the reverse rotation of the external drive device causes the connecting pipe to disengage from the threaded connection, thereby releasing the axial constraint on the filler. At this point, the worn filler can be removed from the second drill bit for replacement or grinding maintenance. The drill bit, through the modular combination of multiple components, allows for rapid disassembly and maintenance.

[0025] Beneficial effects: In this utility model, the tungsten mine is operated using a hard rock double-edged cutting drill bit. Through the dual-drill bit collaborative operation mechanism, the hard rock drilling process is effectively optimized. The first drill bit undertakes the initial tunneling task, and its front cutting edge quickly forms a guide hole with concentrated cutting force, reducing the initial drilling resistance. The second drill bit then performs hole enlargement operation. Its outer diameter is larger than that of the first drill bit. It achieves progressive hole enlargement by contacting the hole wall with a conical arc surface, avoiding stress concentration caused by sudden changes in hole diameter.

[0026] In this invention, the tungsten mine uses a hard rock double-edged cutting drill bit, and the combination design of the filler and the second drill head significantly improves the hole enlargement efficiency; multiple sets of drilling blades fixed on the support column contact the rock strata through stepped sawtooth protrusions, forming a shearing-crushing dual action mechanism. The continuous tooth profile of the stepped sawtooth can peel away the rock body step by step, reducing the cutting load of a single tooth; after the blade extends outward through the mounting groove, its working radius covers the outer edge of the second drill head, ensuring that the hole enlargement diameter is accurately controllable;

[0027] In this invention, the tungsten mining utilizes a hard rock double-edged cutting drill bit, and the modular connection structure enables rapid drill bit maintenance. The connector is locked to the inner cavity of the second drill head via threads, and its end face directly presses against the root of the drill bit, transferring the axial load to the support column and ensuring that the filler remains in rigid contact with the inner wall of the drill bit. When it is necessary to replace worn parts, the filler can be removed as a whole simply by loosening the connector, without disassembling the drill bit body, thus significantly improving maintenance efficiency.

[0028] In this invention, the tungsten mine uses a hard rock double-edged cutting drill bit, and a multi-dimensional water supply system improves the working environment. After the external water source is introduced through the connecting pipe, it is distributed to the water delivery channel through the sealing gap between the installation through hole and the support column, forming a dual path of main water flow and branch water flow. The main water flow reaches the front end of the first drill head directly through the water outlet channel, directly cooling the initial cutting area. The branch water flow is diverted to the conical surface of the second drill head through the connecting hole, and sprayed to the reaming working face through the water outlet hole, realizing full-section cooling and cuttings scouring.

[0029] In this utility model, the tungsten mine adopts a hard rock double-edged cutting drill bit, and the embedded design of wear-resistant convex balls enhances the adaptability of the drill bit; the wear-resistant convex balls evenly distributed on the edge of the second drill head roll and crush the hole wall during rotation, which can not only eliminate irregular protrusions on the hole wall and prevent drill jamming accidents, but also reduce frictional resistance through point contact and extend the service life of the drill bit.

[0030] In this invention, the drill bit achieves progressive hole enlargement through the coordinated operation of two drill bits, avoiding stress concentration; the stepped sawtooth blades can shear and break the rock mass, improving the hole enlargement accuracy; the modular connection structure facilitates quick replacement of worn parts; the dual-path cooling system covers the entire working surface to complete cooling and chip removal; the edge wear-resistant convex balls are rolled to finish the hole wall, which can effectively prevent the drill from getting stuck and extend the service life of the drill bit. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural schematic diagram of the hard rock double-edged cutting drill bit for tungsten mining proposed in this utility model;

[0032] Figure 2 This is a cross-sectional structural diagram of the hard rock double-edged cutting drill bit for tungsten mining proposed in this utility model.

[0033] Figure 3This is a schematic diagram showing the disassembled structure of the tungsten mine mining double-edged cutting drill bit for hard rock proposed in this utility model;

[0034] Figure 4 This is a schematic diagram of the filling component structure of the hard rock double-edged cutting drill bit for tungsten mining proposed in this utility model.

[0035] Figure 5 This is a schematic diagram of the second drill head structure of the hard rock double-edged cutting drill bit proposed in this utility model for tungsten mining.

[0036] In the diagram: 1. First drill head; 2. Second drill head; 3. Filler; 4. Connector; 5. Water outlet channel; 6. Connecting plug; 7. Connecting pipe; 8. Mounting through hole; 9. Support column; 10. Drilling blade; 11. Water delivery channel; 12. Connecting hole; 13. Mounting groove; 14. Water outlet hole; 15. Wear-resistant convex ball. Detailed Implementation

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0038] In one embodiment: Refer to Figure 1-5 A drill bit, comprising: a first drill head 1, a second drill head 2, a filler 3, a connector 4, and a water-passing structure, etc.

[0039] In this embodiment, the first drill head 1 and the second drill head 2 constitute the main structure of the drill bit. The first drill head 1 is fixedly installed at one end of the second drill head 2, and the outer diameter of the second drill head 2 is larger than that of the first drill head 1. In actual mining operations, the first drill head 1 is responsible for tunneling through the rock strata during tungsten mining, while the second drill head 2 is responsible for expanding the drilled hole to meet mining requirements. One end of the second drill head 2 is provided with a conical arc surface that connects to the first drill head 1. This structure helps the drill bit to enter the rock strata more smoothly. Multiple mounting slots 13 are provided on the conical arc surface to provide space for the installation of subsequent components.

[0040] In this embodiment, the filler 3 is disposed inside the second drill head 2 for cutting the rock strata. It consists of a support column 9 and multiple drill bit 10s, which are uniformly fixed to the outer circumference of the support column 9. Each drill bit 10 has multiple stepped serrated protrusions on one side, which enhance the cutting effect. The serrated protrusions of the multiple drill bit 10 pass through the corresponding mounting grooves 13 and extend to the outside of the second drill head 2. When the drill bit rotates, the serrated protrusions contact the rock strata, thereby cutting and enlarging the hole in the rock strata.

[0041] In this embodiment, the connector 4 is threadedly fixed inside the second drill head 2, with one end abutting against the filler 3 to ensure stable installation of the filler 3 inside the second drill head 2. The connector 4 consists of a connecting plug 6 and a connecting tube 7, with the connecting tube 7 fixedly installed at one end of the connecting plug 6. The outer wall of the connecting plug 6 is threaded and connected to the inner wall of the second drill head 2 via threads. One end of the connecting plug 6 is tightly fitted against one side of multiple drilling blades 10, thereby firmly fixing the filler 3 inside the second drill head 2. The inner wall of the connecting tube 7 is also threaded, and its function is to connect and fix it to the external drive rod, which drives the drill bit to rotate.

[0042] In this embodiment, the water-passing structure is used to introduce water during drilling, serving to cool and lubricate the drill bit, extending its service life and improving drilling efficiency. The water-passing structure includes a water outlet channel 5 located inside the first drill head 1, which penetrates the interior of the first drill head 1 and connects to the interior of the second drill head 2. A water delivery channel 11 is provided inside the filler 3, with one end of the filler 3 tightly abutting the inner wall of the second drill head 2, allowing the water delivery channel 11 to mate with the water outlet channel 5. An installation through-hole 8 is provided inside the connecting plug 6, with the support column 9 slidingly sealingly engaging with the inner wall of the installation through-hole 8, and the installation through-hole 8 connecting to the connecting pipe 7. When external water enters the installation through-hole 8 through the connecting pipe 7, it sequentially passes through the water delivery channel 11 and the water outlet channel 5, thus introducing the water source.

[0043] In this embodiment, the water-passing structure also includes multiple connecting holes 12 formed on the outer wall of the filler 3. These connecting holes 12 are respectively located within the gaps between two adjacent drill bits 10 and are all connected to the water supply channel 11. The conical arc surface of the second drill head 2 is provided with multiple water outlet holes 14, which are located between multiple adjacent sets of mounting slots 13. Water introduced into the second drill head 2 enters through the connecting holes 12 and exits through the water outlet holes 14, ensuring that water can be applied to the exterior of both the second drill head 2 and the first drill head 1, effectively cooling and lubricating the working parts of the drill bit.

[0044] This application can be used in the field of tungsten mining technology, or in other fields applicable to this application.

[0045] In another embodiment: Reference Figure 5 Hard rock double-edged cutting drill bits are used in tungsten mining, and their application in the field of tungsten mining technology.

[0046] In this embodiment, a plurality of wear-resistant protrusions 15 are fixedly embedded at the circumferential edge of the second drill head 2, and these wear-resistant protrusions 15 are evenly distributed. During the operation of the drill bit, the wear-resistant protrusions 15 can expand and cut the edge of the drill hole, helping the second drill head 2 to penetrate the hole more stably, thereby improving the stability and efficiency of drilling.

[0047] The working principle and usage process of this technical solution are as follows: When the drill bit is started, the external drive device drives the entire drill bit to rotate through the connecting pipe 7. The first drill head 1 first contacts the rock strata, and its front cutting edge cuts into the hard rock to form an initial hole. As the drilling depth increases, the conical arc surface of the second drill head 2 contacts the hole wall. At this time, the second drill head 2, with a larger outer diameter, begins to radially expand the hole. Multiple drilling blades 10, fixed on the support column 9, extend out of the outer edge of the second drill head 2 through the mounting groove 13. The stepped serrated protrusions on the surface of the blades break the rock mass of the hole wall by shearing, thereby achieving continuous hole expansion.

[0048] During drilling, external water flows into the mounting hole 8 of the connecting plug 6 through the internal channel of the connecting pipe 7. The water flows through the sealing gap between the mounting hole 8 and the support column 9 into the water delivery channel 11. The water delivery channel 11 guides the water flow into the outlet channel 5 to ensure that the water can be discharged through the front end of the first drill head 1. It also allows the water flow to be diverted through the connecting hole 12 on the outer wall of the filler 3. The diverted cooling water is sprayed out through the outlet hole 14 on the conical arc surface of the second drill head 2, directly acting on the cutting areas of the first drill head 1 and the second drill head 2. Simultaneously, the water flows along the borehole wall, effectively reducing the temperature of the drill bit's cutting section.

[0049] When the drill bit is subjected to axial load, the connecting plug 6 is threadedly fastened to the inner cavity of the second drill head 2, and its end face continuously presses against the root plane of the drill bit 10. This pressure is transmitted to the support column 9, ensuring that the filler 3 remains in close contact with the inner wall of the second drill bit. The wear-resistant convex balls 15 embedded in the circumferential edge of the second drill head 2 rotate with the drill bit, generating a rolling and crushing effect on the rock mass at the edge of the hole, preventing the drill from getting stuck due to irregular shrinkage of the hole wall.

[0050] When the drill bit needs replacement or maintenance, the reverse rotation of the external drive device causes the connecting pipe 7 to disengage the connecting plug 6 from the threaded connection, thereby releasing the axial constraint on the filler 3. At this time, the worn filler 3 can be removed from the second drill head 2 for replacement or grinding maintenance. The drill bit, through the modular combination of multiple components, enables corresponding quick disassembly and maintenance.

Claims

1. A double-edged hard rock cutting drill bit for tungsten mining, characterized in that, include: The first drill head (1) and the second drill head (2) are fixedly connected to one end of the second drill head (2). The outer diameter of the second drill head (2) is larger than the outer diameter of the first drill head (1). The first drill head (1) is used to excavate the rock strata to form a hole, and the second drill head (2) is used to expand the hole. A filler (3) is placed inside the second drill head (2) for cutting rock strata; The connector (4) is fixed inside the second drill head (2) by a thread, and one end of it abuts against the filler (3) to fix the filler (3); A water-passing structure is used to introduce water to cool the drill bit; During drilling, the first drill bit (1) cuts into the rock strata first, the second drill bit (2) then enlarges the hole, the filler (3) assists in cutting, and the water-conducting structure guides water to reduce the temperature of the drill bit.

2. The tungsten ore mining hard rock double-edged cutting drill bit according to claim 1, characterized in that, The second drill head (2) has a tapered arc surface at one end, which is connected to the first drill head (1) and has multiple mounting slots (13); the filler (3) includes a support column (9) and multiple drill bits (10), the multiple drill bits (10) are fixed to the outer circumference of the support column (9), each drill bit (10) has a stepped serrated protrusion, the serrated protrusion penetrates the mounting slot (13) and extends to the outside of the second drill head (2) to shear and break the rock mass to achieve hole enlargement.

3. The tungsten ore mining hard rock double-edged cutting drill bit according to claim 2, characterized in that, The connector (4) includes a connecting plug (6) and a connecting tube (7). The connecting tube (7) is fixed to one end of the connecting plug (6). The outer wall of the connecting plug (6) is threaded and threaded to the inner wall of the second drill head (2). One end of the connecting plug (6) presses against the drill bit (10). The inner wall of the connecting tube (7) is threaded for connecting an external drive rod.

4. The tungsten ore mining hard rock double-edged cutting drill bit according to claim 3, characterized in that, The water passage structure includes a water outlet channel (5) opened inside the first drill head (1), which passes through the first drill head (1) and connects to the inside of the second drill head (2); a water conveying channel (11) is opened inside the filler (3), and one end of the filler (3) is sealed and fitted to the inner wall of the second drill head (2), so that the water conveying channel (11) and the water outlet channel (5) are connected; an installation through hole (8) is opened inside the connecting plug (6), and the support column (9) is sealed and slidably fitted with the inner wall of the installation through hole (8), and the installation through hole (8) is connected to the connecting pipe (7) to introduce external water source.

5. The tungsten ore mining hard rock double-edged cutting drill bit according to claim 4, characterized in that, The water-passing structure also includes multiple connecting holes (12) opened on the outer wall of the filler (3). The multiple connecting holes (12) are located in the gap between adjacent drill bits (10) and are all connected to the water supply channel (11). The conical arc surface of the second drill head (2) is provided with multiple water outlet holes (14). The multiple water outlet holes (14) are located between adjacent mounting slots (13) and are used to discharge water to cool the outside of the drill bit.

6. The tungsten ore mining hard rock double-edged cutting drill bit according to claim 1, characterized in that, The second drill bit (2) has multiple wear-resistant convex balls (15) fixedly embedded on its circumferential edge. The multiple wear-resistant convex balls (15) are evenly distributed and used to roll and crush the rock mass at the edge of the hole to prevent the drill from getting stuck.

7. The tungsten ore mining method using a hard rock double-edged cutting drill bit according to any one of claims 2-6, characterized in that, During drilling, external water flows into the installation through hole (8) through the connecting pipe (7), and enters the water supply channel (11) through the gap between the support column (9) and the installation through hole (8). Part of the water flows out through the water outlet channel (5) to the front end of the first drill head (1), and the other part is diverted through the connecting hole (12) and sprayed out from the water outlet hole (14) to cover the cutting area and cool it down.

8. The hard rock double-edged cutting drill bit for tungsten mining according to claim 3, characterized in that, When subjected to axial load, the connecting plug (6) presses against the drill bit (10) through threaded fastening, so that the filler (3) maintains rigid contact with the inner wall of the second drill head (2); during maintenance, the connecting pipe (7) can be rotated in the opposite direction to remove the connecting plug (6) and take out the filler (3) for replacement.

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