A concave flat bottom mouth with centralizer pipe guiding drill bit

Abstract

The utility model belongs to the coal mine drilling technology field, and disclose a kind of inner recess formula flat bottom mouth adds centralizing pipe guide drill bit, including outer drill bit, inner drill bit, guide pipe, the top of outer drill bit outer surface and top end are respectively fixedly installed with outer cutting edge, bottom cutting edge, the outer drill bit, inner drill bit and lower guide pipe are connected by fixed joint thread.The utility model is provided with outer drill bit, inner drill bit, guide pipe, the end design of outer drill bit, outer cutting edge and inner drill bit, bottom cutting edge, drill bit body and guide pipe outer diameter are same, outer drill bit has outer cutting edge, diameter is slightly larger than drill bit body 1.5mm or so, after cutting rock layer, drill bit body and guide pipe and the drill hole formed are closely combined, and annular gap with drill hole wall is smaller, avoid the drill hole deflection caused by drill bit shaking;Second recess design utilizes the sharp annular outer cutting edge of outer drill bit, first annular cutting is formed when drilling, and inner drill bit follows cutting rock core.

Description

Technical Field

[0001] This utility model belongs to the field of coal mine underground technology, specifically a concave flat-bottomed drill bit with a straightening pipe for guidance. Background Technology

[0002] Drill bits are the core tools used in drilling projects to break rocks and form wellbores. The drill bit is connected to the drilling rig through the drill rod, receives rotational power and axial pressure, and transfers energy to the cutting teeth. Through rotation or impact, the cutting teeth of the drill bit (such as diamond or cemented carbide) are pressed into the rock, forming cracks and breaking them, thus enabling downward drilling.

[0003] In actual use, drill bits still have certain shortcomings. Traditional drill bits mostly adopt a pointed design at the end. When the drill bit is pressurized and drills into the rock, the tip of the drill bit will contact the rock first. Since the outer diameter of the traditional drill bit and the outer diameter of the drill rod are quite different, the drill bit is prone to deviation and swinging due to the continuous impact between the drill bit tip and the rock. At this time, the drill bit will not be able to drill according to the preset trajectory, resulting in the drilled hole being deviated from the preset drilling trajectory. Therefore, this needs to be improved. Summary of the Invention

[0004] The purpose of this utility model is to address the above problems. This utility model provides a concave flat bottom opening with a guide tube for the drill bit, which has the advantage of preventing the drill bit from deviating.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a concave flat-bottomed drill bit with a guide tube, comprising an outer drill bit, an inner drill bit, and a guide tube. The top and bottom of the outer surface of the outer drill bit are respectively fixedly installed with an outer cutting edge and a bottom cutting edge. The outer drill bit, the inner drill bit, and the lower guide tube are connected by a fixed joint threaded connection.

[0006] As a preferred embodiment of this utility model, the top end of the internal drill bit is provided with four oblique holes, and the four oblique holes are all the same in shape and size.

[0007] As a preferred embodiment of this utility model, a circular hole is provided in the middle of the bottom end of the internal drill bit, and a through hole is provided in the middle of the fixed joint.

[0008] In a preferred embodiment of this invention, the bottom end of the fixed joint is threadedly fitted with a drill rod located inside the guide tube, and the outer surface of the drill rod and the inner surface of the guide tube are movably fitted together.

[0009] In a preferred embodiment of this utility model, the length of the outer drill bit is 20 cm, the length of the inner drill bit is 16 cm, and the length of the guide tube is 150 cm; the outer diameter of the outer drill bit is 94 mm, the outer diameter of the inner drill bit is 93 mm, the outer diameter of the guide tube is 89 mm, and the outer diameter of the fixed joint is the same as the outer diameter of the guide tube.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention features an outer drill bit, an inner drill bit, and a guide tube. The outer drill bit has an external cutting edge, while the inner drill bit has a bottom cutting edge. The drill bit body and the guide tube have the same outer diameter. Firstly, the outer drill bit has an external cutting edge, with a diameter slightly larger than the drill bit body by about 1.5mm. After cutting through the rock strata, the drill bit body and guide tube fit tightly into the formed borehole, with a small annular gap between them and the borehole wall, preventing borehole deviation caused by drill bit movement within the hole. Secondly, the concave design utilizes the sharp annular external cutting edge of the outer drill bit to first make an annular cut during drilling, forming a guide annular hole, and then the inner drill bit follows with further cutting. The core sample is obtained by using an outer drill bit for guided cutting and an inner drill bit for grinding. This dual-drill-bit design allows both the outer and inner drill bits to perform guided grinding of the rock during drilling. The core sample drilled by the outer drill bit is then directly ground away by the inner drill bit, ensuring thorough core grinding and avoiding issues such as changes in the borehole trajectory caused by large pieces. This reduces borehole deviation and ensures the drill bit follows the predetermined path. In summary, compared to traditional drill bits, the drill bit designed in this invention effectively avoids borehole deviation during drilling operations. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the end structure of the present invention; Figure 3 This is a cross-sectional view of the front of the present invention; Figure 4 This is a cross-sectional view of the side of the present invention; Figure 5 This is a partial structural diagram of the internal drill bit of this utility model.

[0012] In the diagram: 1. Outer drill bit; 2. Outer cutting edge; 3. Inner drill bit; 4. Bottom cutting edge; 5. Fixed joint; 6. Guide tube; 7. Inclined hole; 8. Round hole; 9. Through hole; 10. Drill rod. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] like Figures 1 to 5 As shown, this utility model provides a concave flat-bottomed drill bit with a guide tube, including an outer drill bit 1, an inner drill bit 3, and a guide tube 6. The top and bottom of the outer surface of the outer drill bit 1 are respectively fixedly installed with an outer cutting edge 2 and a bottom cutting edge 4. The outer drill bit 1, the inner drill bit 3, and the lower guide tube 6 are connected by a fixed joint 5.

[0015] Both the outer drill bit 1 and the inner drill bit 3 have flat-bottomed ends. The outer cutting edges 2 are arranged in an evenly spaced circular array on the top of the outer surface of the outer drill bit 1, and the bottom cutting edges 4 are arranged in an evenly spaced circular array on the top of the outer drill bit 1. In addition, the presence of the inner drill bit 3 can grind away the rock core generated by the outer drill bit 1 during drilling. At the same time, the top of the inner drill bit 3 is provided with non-contacting cross-shaped teeth, so that rock particles will not get stuck when grinding the rock core. The continuous grinding of the inner drill bit 3 eliminates the need for the operator to repeatedly remove the drill bit to clean and remove the rock core. The outer diameter of the guide tube 6 is almost the same as the outer diameter of the outer drill bit 1, which can improve the guidance during drilling and prevent the drill bit from deviating.

[0016] The top of the internal drill bit 3 has four oblique holes 7, and the four oblique holes 7 are all the same in shape and size.

[0017] The presence of the inclined hole 7 will be used to supply water during drilling, thereby ensuring the normal operation of the drill bit.

[0018] Among them, the inner drill bit 3 has a round hole 8 in the middle of its bottom end, and the fixed joint 5 has a through hole 9 in the middle end.

[0019] The inclined hole 7 and the round hole 8 are interconnected, and the round hole 8 and the through hole 9 are interconnected, which facilitates the supply of water to the inclined hole 7 through the through hole 9 and the round hole 8 when the drill bit is drilling.

[0020] The bottom end of the fixed joint 5 is threaded with a drill rod 10 located inside the guide tube 6, and the outer surface of the drill rod 10 and the inner surface of the guide tube 6 are movably connected.

[0021] Drill pipe 10 is a traditional drill pipe with a hollow interior, mainly used for connection, transmission and water supply.

[0022] The outer drill bit 1 is 20 cm long, the inner drill bit 3 is 16 cm long, and the guide tube 6 is 150 cm long. The outer diameter of the outer drill bit 1 is 94 mm, the outer diameter of the inner drill bit 3 is 93 mm, the outer diameter of the guide tube 6 is 89 mm, and the outer diameter of the fixed joint 5 is the same as that of the guide tube 6.

[0023] The gap between the outer drill bit 1 and the inner drill bit 3 is very small, which prevents small rock cuttings from entering the gap between the outer drill bit 1 and the inner drill bit 3.

[0024] Working principle and usage process of this utility model: In use, the operator first connects and fixes the outer drill bit 1, inner drill bit 3, guide tube 6, and drill rod 10 to the fixed joint 5 via threads to complete the drill bit assembly. Drilling can then commence. While the outer drill bit 1 is drilling, the presence of the inner drill bit 3 allows for direct grinding of the drilled rock core, eliminating the need for repeated core removal by the operator. Furthermore, during drilling, because the outer diameters of the outer drill bit 1 and the guide tube 6 are similar, and both the ends of the outer drill bit 1 and the inner drill bit 3 are... The flat-bottom design utilizes the sharp annular outer cutting edge 2 of the outer drill bit 1 to first make an annular cut during drilling, forming a guide annular hole. Then, the inner drill bit 3 follows to cut the rock core, achieving the guiding cutting drilling effect of the outer drill bit 1 and the grinding effect of the inner drill bit 3. This allows the outer drill bit 1 and the inner drill bit 3 to perform guiding grinding on the rock during drilling, and then the rock core drilled by the outer drill bit 1 is directly ground away by the inner drill bit 3, ensuring sufficient grinding of the rock core and avoiding problems such as changes in the drilling trajectory caused by large pieces.

[0025] 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.

[0026] 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 concave flat-bottomed drill bit with a guide tube, comprising an outer drill bit (1), an inner drill bit (3), and a guide tube (6), characterized in that: The outer drill bit (1) has an outer cutting edge (2) and a bottom cutting edge (4) fixedly installed on its outer surface. The outer drill bit (1), the inner drill bit (3) and the lower guide tube (6) are connected by a fixed joint (5) threaded together.

2. The concave flat-bottomed drill bit with a guide tube as described in claim 1, characterized in that: The top of the internal drill bit (3) is provided with an oblique hole (7), and there are four oblique holes (7), all of which are the same in shape and size.

3. A concave flat-bottomed drill bit with a guide tube for straightening, as described in claim 1, characterized in that: The inner drill bit (3) has a round hole (8) at the middle of its bottom end, and the fixed connector (5) has a through hole (9) at its middle end.

4. A concave flat-bottomed drill bit with a guide tube for straightening, as described in claim 1, characterized in that: The bottom end of the fixed joint (5) is threaded with a drill rod (10) located inside the guide tube (6), and the outer surface of the drill rod (10) and the inner surface of the guide tube (6) are movably connected.

5. A concave flat-bottomed drill bit with a guide tube for straightening, as described in claim 1, characterized in that: The length of the outer drill bit (1) is 20 cm, the length of the inner drill bit (3) is 16 cm, and the length of the guide tube (6) is 150 cm. The outer diameter of the outer drill bit (1) is 94 mm, the outer diameter of the inner drill bit (3) is 93 mm, the outer diameter of the guide tube (6) is 89 mm, and the outer diameter of the fixed joint (5) is the same as the outer diameter of the guide tube (6).

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