Drill bit for mining

Abstract

The utility model discloses a mining drill bit which comprises an outer-layer drill bit body, a communicating pipe and a central pipe, the outer-layer drill bit body is arranged on the outer side of the communicating pipe, the central pipe is arranged on the inner side of the communicating pipe, and the outer-layer drill bit body and the central pipe are communicated with gas through a gas channel in the communicating pipe. The outer-layer drill bit further comprises a loosening mechanism and a fixing mechanism, the loosening mechanism is arranged on the side face of the outer-layer drill bit, and the fixing mechanism is arranged on the right side of the outer-layer drill bit; and a dredging mechanism is also arranged on the communicating pipe. The device has the functions that the device can automatically run to be separated from jamming, and manpower and time required by manual adjustment are saved; the circulation effect of reverse circulation airflow can be ensured, and the working efficiency is ensured; and the maintained drill bit can be prevented from being polluted, and the service life of the drill bit is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of mining equipment technology, and in particular relates to a mining drill bit. Background Technology

[0002] In mining equipment, down-the-hole hammer drilling is widely used in various mining operations, using compressed air and a piston to drive the front drill bit to crush and absorb ore.

[0003] In the prior art, such as Chinese Patent (CN206571429U), a mining drill bit for mining machinery is disclosed, belonging to the field of mining machinery. The mining drill bit for mining machinery includes a drill bit body, a bottom tube, an arc-shaped tube, and a core tube. This utility model adopts an annular nozzle structure formed by the gap fit between the arc-shaped tube and the bottom tube. When used in conjunction with the arc-shaped tube, it can largely solve the problem that the reverse circulation of existing reverse circulation drill bits is sometimes not thorough when drilling in fractured or leaky strata, and a considerable portion of the gas carrying rock powder escapes from the outer annulus and is discharged to the surface. Moreover, this utility model uses a bottom tube, an arc-shaped tube, and a core tube connected in combination to replace a single internal tube, which is not only easier to process, but also has a better reverse circulation slag removal effect and lower air consumption. In addition, it can avoid annular leakage and long-term accumulation of a large amount of rock cuttings and rock powder in the outer annular gap between the drill bit and the borehole wall, which would cause difficulties in drilling and avoid borehole accidents such as drill bit burial, drill bit jamming, or even drill bit breakage.

[0004] This method has the following drawbacks: First, during drill bit operation, the drill bit's front teeth may become stuck in the rock formation and cannot continue rotating. In this case, a pneumatic hammer needs to be used manually to loosen the drill bit by tapping the drill rod. Since the exact direction of the jamming is unknown, it is necessary to tap from various directions to loosen the drill bit and release it from the jam, which is time-consuming and laborious. Second, in the reverse circulation mixing zone, eddies are formed under the action of airflow. Dust in the eddies, under the action of water vapor condensation during drilling, will accumulate on the inner wall of the mixing zone. After a long period of accumulation, it will obstruct the air intake of the side injection holes, affecting the reverse circulation gas flow efficiency and reducing the working efficiency of the drill bit. Third, after cleaning and maintenance, the drill bit should be stored away from contact with other metal objects to prevent corrosion of the drill bit body. This device lacks a support structure for drill bit storage, which means that the drill bit will inevitably come into contact with other surfaces during transfer, leading to surface contamination and increasing the risk of corrosion.

[0005] Therefore, this paper provides a drilling bit for mining. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model discloses a mining drill bit. The device can automatically operate to disengage from jamming, saving the manpower and time required for manual adjustment; it can ensure the smooth flow of reverse airflow, ensuring work efficiency; and it can also prevent the drill bit from being contaminated after maintenance, increasing the service life of the drill bit.

[0007] To achieve the above-mentioned technical effects, this utility model provides a mining drill bit, including an outer drill bit, a connecting pipe, and a central pipe. The outer drill bit is disposed on the outside of the connecting pipe, and the central pipe is disposed on the inside of the connecting pipe. The outer drill bit and the central pipe are connected by gas through a gas channel on the connecting pipe. The outer drill bit also includes a loosening mechanism and a fixing mechanism. The loosening mechanism is disposed on the side of the outer drill bit, and the fixing mechanism is disposed on the right side of the outer drill bit. The connecting pipe is also provided with a clearing mechanism.

[0008] Preferably, the loosening mechanism further includes an air hole a, an air hole b, a control valve a, a piston a, a connecting rod, and a protrusion. The air hole a is located inside the outer drill bit, the air hole b is located below the air hole a, the control valve a is located on the air hole a, the control valve b is located on the air hole b and the air hole a and air hole b are connected through the control valve b, the piston a is located inside the air hole a, the connecting rod is located below the piston a, the protrusion is located on the right side of the connecting rod and the left side of the protrusion is hinged to the connecting rod a, and the protrusion is connected to the outer drill bit through a rotating shaft.

[0009] Preferably, the fixing mechanism further includes a fixing hole and a fixing support. The fixing hole is located on the right side of the outer drill bit, and the fixing support is located on the right side of the fixing hole, with the left end of the fixing support able to be inserted into the fixing hole.

[0010] Preferably, the fixing hole and the fixing support are connected by a magnetic structure.

[0011] Preferably, the unblocking mechanism further includes an air chamber, a piston b, and a spring. The air chamber is located inside the connecting pipe, the piston b is located inside the air chamber, and the spring is located below the piston b.

[0012] Preferably, the air chamber is provided with air holes at both ends to connect the outer drill bit and the central tube, and the diameter of the air hole on the left is smaller than the diameter of the air hole on the right.

[0013] Preferably, a tapered hole is provided on the left side of the air chamber.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] The device includes an outer drill bit, a connecting pipe, and a central pipe. The outer drill bit incorporates a loosening mechanism that, when it becomes stuck in rock, uses compressed air to propel the drill bit. A protrusion extends from the outer side of the drill bit, pressing against the side rock wall to loosen the stuck area. This process is repeated multiple times to dislodge the drill bit, allowing for automatic operation and saving the manpower and time required for manual adjustments. A clearing mechanism connected to the compressed air source is located in the reverse-circulation airflow mixing area. This mechanism repeatedly sprays airflow as the drill bit drills downwards, promptly blowing away accumulated dust in the mixing area and ensuring efficient reverse-circulation airflow. A mounting and fixing mechanism is located on the side of the outer drill bit, providing support and stability during drill bit maintenance, preventing contamination after maintenance, and extending the drill bit's lifespan. Attached Figure Description

[0016] Figure 1 This is an isometric view of the present invention;

[0017] Figure 2 This is a front view of the present invention;

[0018] Figure 3 yes Figure 2 A sectional view of section a.

[0019] Figure 4 yes Figure 3 A partial schematic diagram of b in the middle;

[0020] Figure 5 yes Figure 3 A partial schematic diagram of c in the middle;

[0021] The attached diagram lists the components represented by each number as follows:

[0022] 1. Outer drill bit; 2. Connecting pipe; 3. Central pipe; 4. Loosening mechanism; 5. Unblocking mechanism; 6. Air hole a; 7. Air hole b; 8. Control valve a; 9. Control valve b; 10. Piston a; 11. Connecting rod; 12. Protrusion; 13. Fixing hole; 14. Fixing support; 15. Air chamber; 16. Piston b; 17. Spring; 18. Tapered hole. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model. Example 1

[0024] like Figures 1 to 5As shown, the prior art in this embodiment has the following problems: The inventors have found the following defects in the prior art: First, during the operation of the drill bit, the drill teeth at the front end may get stuck in the rock strata and cannot continue to rotate. At this time, it is necessary to manually use a pneumatic hammer to tap the drill rod to loosen the drill bit. Since the specific direction of the drill bit being stuck is not clear, it is necessary to tap from various directions to loosen the drill bit and let it get out of the jam. The whole process is time-consuming and laborious. Second, in the reverse circulation mixing area, eddies will be formed under the action of airflow. The dust in the eddies will accumulate on the inner wall of the mixing area due to the condensation of water vapor during drilling. After a long period of accumulation, it will cause the air intake of the side injection holes to be blocked, affecting the reverse circulation gas flow efficiency and reducing the working efficiency of the drill bit. Third, after cleaning and maintenance, the drill bit should be stored in a way that avoids contact with other metal objects to prevent corrosion of the drill bit body. This device lacks a support structure for the drill bit storage, which will inevitably cause the drill bit to come into contact with other surfaces during the transfer process, resulting in contamination of the drill bit surface and increasing the risk of corrosion.

[0025] Therefore, the inventor provides a mining drill bit, including an outer drill bit 1, a connecting pipe 2, and a central pipe 3. The outer drill bit 1 is located outside the connecting pipe 2, and the central pipe 3 is located inside the connecting pipe 2. The outer drill bit 1 and the central pipe 3 are connected by a gas passage on the connecting pipe 2. The outer drill bit 1 also includes a loosening mechanism 4 and a fixing mechanism. The loosening mechanism 4 is located on the side of the outer drill bit 1, and the fixing mechanism is located on the right side of the outer drill bit 1. The connecting pipe 2 is also provided with a clearing mechanism 5.

[0026] Using the above scheme, when the outer drill bit 1 gets stuck in the rock stratum during device operation, the loosening mechanism 4 is activated. As the device continues to operate and attempts to disengage, the loosening mechanism 4 is driven by compressed air, repeatedly pressing against the rock wall and shaking the device until the stuck position is loosened, allowing the outer drill bit 1 to disengage. During normal operation of the device, a stream of compressed air is converted and guided by the unblocking mechanism 5, and then generates an airflow in the mixing vortex area of ​​the connecting pipe 2 and the reverse circulation airflow at the lower end of the central layer. This airflow blows out the dust in the vortex area, allowing the dust to be discharged smoothly and preventing it from accumulating in the mixing area and causing blockage. After the drill bit is used, the fixed support 14 can be inserted into the fixed hole 13, allowing part of the device body to be removed from the contact surface of the placement platform, thus obtaining better storage conditions, preventing pollution and corrosion, and extending service life.

[0027] Based on the above embodiment 1, the inventors made the following improvements: Example 2

[0028] like Figures 1 to 5 As shown:

[0029] Furthermore, the loosening mechanism 4 also includes an air hole a6, an air hole b7, a control valve a8, a control valve b9, a piston a10, a connecting rod 11, and a protrusion 12. The air hole a6 is located inside the outer drill bit 1, the air hole b7 is located below the air hole a6, the control valve a8 is located on the air hole a6, the control valve b9 is located on the air hole b7 and the air hole a6 and the air hole b7 are connected through the control valve b9, the piston a10 is located inside the air hole a6, the connecting rod 11 is located below the piston a10, the protrusion 12 is located on the right side of the connecting rod 11 and the left side of the protrusion 12 is hinged to the connecting rod 11, and the protrusion 12 is connected to the outer drill bit 1 through a rotating shaft.

[0030] When the outer drill bit 1 is stuck, control valve a8 closes and control valve b9 opens, allowing compressed air to enter through air hole b7 and push piston a10 upward. This pushes protrusion 12 through connecting rod 11, causing protrusion 12 to rotate outward and press against the rock wall. Then, control valve a8 opens and control valve b9 closes, allowing compressed air to enter through air hole a6 and push piston a10 downward. This pushes protrusion 12 back through connecting rod 11. The loosening mechanisms 4 in each direction can operate repeatedly in this manner and can be driven independently to achieve the purpose of continuously shaking the outer drill bit 1 in coordination with the rotation of the device itself, thus freeing the device from being stuck.

[0031] Furthermore, the fixing mechanism also includes a fixing hole 13 and a fixing support 14. The fixing hole 13 is located on the right side of the outer drill bit 1, and the fixing support 14 is located on the right side of the fixing hole 13, and the left end of the fixing support 14 can be inserted into the fixing hole 13.

[0032] When using the drill bit, the fixed support 14 can be removed, and when storing the drill bit, the fixed support 14 can be installed to prevent the drill bit from being contaminated and to increase the service life of the drill bit.

[0033] Furthermore, the fixing hole 13 and the fixing support 14 are connected by a magnetic structure;

[0034] The magnetic structure connection facilitates the separation and installation of the fixed support 14 and the fixed hole 13.

[0035] Furthermore, the unblocking mechanism 5 also includes an air chamber 15, a piston b16, and a spring 17. The air chamber 15 is located inside the connecting pipe 2, the piston b16 is located inside the air chamber 15, and the spring 17 is located below the piston b16.

[0036] During normal operation, compressed air enters the air chamber 15 from the outside of the connecting pipe 2, pushing the piston b16 downwards and compressing it. The compressed gas below the piston b16 is then rapidly ejected into the mixing zone between the connecting pipe 2 and the lower end of the central layer, blowing out the dust remaining in the vortex area of ​​the mixing zone. Afterwards, the spring 17 resets the piston b16, thus cooperating with the device to drill downwards, allowing the dust to be discharged smoothly, ensuring the flow effect of the reverse circulation airflow, and ensuring working efficiency.

[0037] Furthermore, air holes are provided at both ends of the air chamber 15 to connect the outer drill bit 1 and the central tube 3, and the diameter of the air hole on the left is smaller than the diameter of the air hole on the right.

[0038] The right-side vent has a larger diameter, allowing more compressed air to enter and push the piston b16 inside the air chamber 15. The air below the piston b16 is compressed and then discharged at high speed from the left-side vent, which has a smaller diameter, thus achieving the purpose of blowing airflow.

[0039] Furthermore, a conical hole 18 is provided on the left side of the air chamber 15;

[0040] The conical hole 18 on the left side of the air chamber 15 can be evenly diffused into the vortex region after the airflow rushes out of the air chamber 15 at high speed.

[0041] In summary, the device includes an outer drill bit 1, a connecting pipe 2, and a central pipe 3. The outer drill bit 1 is equipped with a loosening mechanism 4. When the outer drill bit 1 becomes stuck in the rock strata, it uses compressed air to power the drill bit's operation. A protrusion 12 extends from the outer side of the outer drill bit 1 and abuts against the side rock wall to loosen the stuck position. This process is repeated multiple times to dislodge the drill bit, allowing for automatic operation and saving the manpower and time required for manual adjustments. A clearing mechanism 5, connecting to the compressed air source, is installed in the mixing area of ​​the reverse circulation airflow. This mechanism repeatedly sprays airflow as the drill bit drills downwards, allowing the airflow to promptly blow away dust accumulated in the mixing area, ensuring smooth dust discharge and guaranteeing the effective flow of the reverse circulation airflow, thus improving work efficiency. A fixing mechanism is installed on the side of the outer drill bit 1 for installation. During drill bit maintenance, it provides support and fixation, preventing contamination of the drill bit after maintenance and increasing its service life.

[0042] The working principle of this utility model:

[0043] When the outer drill bit 1 gets stuck in the rock layer during operation, control valve a8 closes and control valve b9 opens, allowing compressed air to enter through air hole b7 and push piston a10 upward. This pushes protrusion 12 through connecting rod 11, causing protrusion 12 to rotate outward and press against the rock wall. Then, control valve a8 opens and control valve b9 closes, allowing compressed air to enter through air hole a6 and push piston a10 downward. This pushes protrusion 12 back through connecting rod 11. The loosening mechanisms 4 in each direction can operate in this manner repeatedly and can be driven independently to achieve the purpose of continuously shaking the outer drill bit 1 in coordination with the rotation of the device itself, thus freeing the device from jamming. This automatic operation saves the manpower and time required for manual adjustment.

[0044] During normal operation of the device, compressed air enters the air chamber 15 from the outside of the connecting pipe 2, pushing the piston b16 downward to compress it. After being compressed, the air below the piston b16 is discharged at high speed from the small diameter left air hole, blowing out the dust remaining in the vortex area of ​​the mixing zone. Then the spring 17 resets the piston b16, thus cooperating with the device to drill downward, allowing the dust to be discharged smoothly, ensuring the flow effect of the reverse circulation airflow, and ensuring work efficiency.

[0045] After the drill bit is used, the fixed support 14 can be inserted into the fixed hole 13, so that part of the device body is separated from the contact surface of the placement platform, so as to obtain better storage conditions, prevent pollution and corrosion, and extend service life.

[0046] This concludes the description of the working principle of the device.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mining drill bit, comprising an outer drill bit (1), a connecting pipe (2), and a central pipe (3), wherein the outer drill bit (1) is disposed outside the connecting pipe (2), and the central pipe (3) is disposed inside the connecting pipe (2), and the outer drill bit (1) and the central pipe (3) are connected to gas through a gas passage on the connecting pipe (2), characterized in that: The outer drill bit (1) also includes a loosening mechanism (4) and a fixing mechanism. The loosening mechanism (4) is located on the side of the outer drill bit (1), and the fixing mechanism is located on the right side of the outer drill bit (1). The connecting pipe (2) is also provided with a clearing mechanism (5).

2. A mining drill bit according to claim 1, characterized in that: The loosening mechanism (4) further includes an air hole a (6), an air hole b (7), a control valve a (8), a control valve b (9), a piston a (10), a connecting rod (11), and a protrusion (12). The air hole a (6) is located inside the outer drill bit (1), the air hole b (7) is located below the air hole a (6), the control valve a (8) is located on the air hole a (6), the control valve b (9) is located on the air hole b (7), and the air hole a (6) and the air hole b (7) are connected through the control valve b (9). The piston a (10) is located inside the air hole a (6), the connecting rod (11) is located below the piston a (10), the protrusion (12) is located on the right side of the connecting rod (11), and the left side of the protrusion (12) is hinged to the connecting rod (11). The protrusion (12) is connected to the outer drill bit (1) through a rotating shaft.

3. A mining drill bit according to claim 1, characterized in that: The fixing mechanism also includes a fixing hole (13) and a fixing support (14). The fixing hole (13) is located on the right side of the outer drill bit (1), and the fixing support (14) is located on the right side of the fixing hole (13) and the left end of the fixing support (14) can be inserted into the fixing hole (13).

4. A mining drill bit according to claim 3, characterized in that: The fixing hole (13) and the fixing support (14) are connected by a magnetic structure.

5. A mining drill bit according to claim 1, characterized in that: The unblocking mechanism (5) further includes an air chamber (15), a piston b (16), and a spring (17). The air chamber (15) is located inside the connecting pipe (2), the piston b (16) is located inside the air chamber (15), and the spring (17) is located below the piston b (16).

6. A mining drill bit according to claim 5, characterized in that: The air chamber (15) is provided with air holes at both ends to connect the outer drill bit (1) and the central tube (3), and the diameter of the air hole on the left is smaller than the diameter of the air hole on the right.

7. A mining drill bit according to claim 5, characterized in that: A tapered hole (18) is provided on the left side of the air cavity (15).

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