Air drill head

Abstract

The present invention relates to the field of drill bit drilling technology, in particular to a pneumatic drill bit. The pneumatic drill bit comprises a drill bit steel body, a fan-shaped fixing block symmetrically arranged on the top of the drill bit steel body, a cross-shaped drill tooth installed between the fan-shaped fixing blocks, and a conical drill tooth arranged at the edge of the cross-shaped drill tooth. The drill bit steel body is a cavity structure, a connecting thread is arranged at the lower end of the inner wall of the drill bit steel body, a first water hole connected to the cavity structure inside the drill bit cylinder steel body is arranged at the center of the cross-shaped drill tooth, a second water hole connected to the cavity structure inside the drill bit steel body is arranged on the fan-shaped fixing block, and a hard alloy coating is arranged on the surface of the conical drill tooth and the surface of the cross-shaped drill tooth. The pneumatic drill bit of the present invention will not break after being used for a long time, has good dispersion of hydraulic impact on the formation, excellent effect, enhanced hardness of the coating material, and greatly improved wear resistance.

Description

Technical Field

[0001] The invention relates to the technical field of drill bit drilling, in particular to a pneumatic drill bit. Background Art

[0002] Cross drill bits are widely used in coal fields, tunnels, metallurgy, geology, water conservancy, construction, and energy. They are mainly used to drill blastholes. Cross drill bits are highly wear-resistant, five or six times more wear-resistant than bits with the same diameter. Existing cross drill bits have the following main deficiencies when in use: (1) Although the drill bit is more wear-resistant than other drill bits, its cross-shaped drill teeth are still prone to breakage after a period of use due to its structural setting, which shortens the service life of the drill bit; (2) The hydraulic impact of the drill bit on the formation is mainly through the water hole in the middle, and the impact effect needs to be improved; (3) The carbide coating thickness of the drill bit is large, the consumables are high, and the wear resistance of the coating needs to be further improved. Summary of the invention

[0003] The purpose of the present invention is to provide a pneumatic drill head that overcomes the shortcomings of the aforementioned prior art, so that the pneumatic drill head will not break after being used for a long time, has good dispersion of hydraulic impact on the formation, has excellent effect, has enhanced hardness of the coating material, and greatly improves wear resistance.

[0004] The technical solution adopted by the present invention to solve the technical problem is:

[0005] A pneumatic drill bit comprises a drill bit steel body, a fan-shaped fixing block symmetrically arranged on the top of the drill bit steel body frontally and rearly and leftward and rightward, a cross-shaped drill tooth installed between the fan-shaped fixing blocks, and a conical drill tooth arranged at the edge of the cross-shaped drill tooth. The drill bit steel body is a cavity structure, a connecting thread is arranged at the lower end of the inner wall of the drill bit steel body, a first water hole connected to the cavity structure inside the drill cylinder steel body is arranged at the center of the cross-shaped drill tooth, a second water hole connected to the cavity structure inside the drill bit steel body is arranged on the fan-shaped fixing block, and a hard alloy coating is arranged on the surface of the conical drill tooth and the surface of the cross-shaped drill tooth.

[0006] Furthermore, a plurality of the conical drill teeth are evenly arranged on the outer wall of the "cross" end of the cross-shaped drill tooth.

[0007] Furthermore, the aperture of the first water hole is larger than the aperture of the second water hole.

[0008] Furthermore, the thickness of the cross-shaped drill teeth is 1.2-1.4 times the thickness of the fan-shaped fixing block.

[0009] Furthermore, the cross-shaped drill teeth are fixed between the fan-shaped fixing blocks by welding.

[0010] Furthermore, the thickness of the cemented carbide coating is 0.5-0.8 mm.

[0011] Furthermore, the cemented carbide coating is mainly composed of the following raw materials in parts by weight: 70-75 parts of tungsten carbide, 0.6-0.8 parts of carbonyl metal powder, 0.1-1.0 parts of vanadium carbide, 1-3 parts of titanium carbide, 0.01-0.03 parts of rare earth oxide, 0.05-0.08 parts of rhodium, and 0.6-1 parts of hafnium carbide.

[0012] Furthermore, the rare earth oxide is composed of yttrium oxide and scandium oxide in a mass ratio of 1:2.

[0013] The beneficial effects of the present invention are as follows: compared with the prior art, the wind drill bit of the present invention forms reinforcement protection for the cross-shaped drill teeth by means of the fan-shaped fixing block arranged on the top of the drill bit steel body, thereby effectively preventing the cross-shaped drill teeth from breaking after a short period of use. The drilling water enters the cavity structure of the drill bit steel body and is ejected from the first borehole and the second borehole. The size of the first borehole is larger than that of the second borehole. The first borehole is mainly used to soften the stratum. The second boreholes surrounding the first borehole have high hydraulic strength, which destroys the stratum around the softened stratum. The first borehole and the second borehole cooperate to greatly improve the drilling efficiency. The hardness of the cemented carbide coating used in the wind drill bit of the present invention is 1.6-1.8 times that of ordinary mining cemented carbide. The coating thickness only needs to be 0.5-0.8mm, which enables the wind drill bit of the present invention to have better wear resistance than ordinary wind drill bits. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the overall structure of the present invention from another angle;

[0016] Among them, 1 is a drill bit steel body, 2 is a fan-shaped fixing block, 3 is a cross-shaped drill tooth, 4 is a conical drill tooth, 5 is a connecting thread, 6 is a first water hole, and 7 is a second water hole. DETAILED DESCRIPTION

[0017] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0018] like Figure 1 and Figure 2In the illustrated embodiment, a pneumatic drill bit comprises a drill bit steel body 1, a fan-shaped fixing block 2 symmetrically arranged on the top of the drill bit steel body 1 front and back and left and right, a cross-shaped drill tooth 3 installed between the fan-shaped fixing blocks 2 and a conical drill tooth 4 arranged at the edge of the cross-shaped drill tooth 3, wherein the drill bit steel body 1 is a cavity structure, a connecting thread 5 is arranged at the lower end of the inner wall of the drill bit steel body 1, a first water hole 6 connected to the cavity structure inside the drill cylinder steel body 1 is arranged at the center of the cross-shaped drill tooth 3, a second water hole 7 connected to the cavity structure inside the drill bit steel body 1 is arranged on the fan-shaped fixing block 2, and a hard alloy coating is arranged on the surface of the conical drill tooth 4 and the surface of the cross-shaped drill tooth 3.

[0019] In this embodiment, a plurality of the conical drill teeth 4 are evenly arranged on the outer wall of the "cross" end of the cross-shaped drill tooth 3.

[0020] In this embodiment, the aperture of the first water hole 6 is larger than the aperture of the second water hole 7 .

[0021] In this embodiment, the thickness of the cross-shaped drill teeth 3 is 1.3 times the thickness of the fan-shaped fixing block 2 .

[0022] In this embodiment, the cross-shaped drill teeth 3 are fixed between the fan-shaped fixing blocks 2 by welding.

[0023] In this embodiment, the thickness of the cemented carbide coating is 0.6 mm.

[0024] In this embodiment, the cemented carbide coating is mainly composed of the following raw materials in parts by weight: 72 parts of tungsten carbide, 0.7 parts of carbonyl metal powder, 0.5 parts of vanadium carbide, 2 parts of titanium carbide, 0.02 parts of rare earth oxide, 0.06 parts of rhodium, and 0.8 parts of hafnium carbide. The rare earth oxide is composed of yttrium oxide and scandium oxide in a mass ratio of 1:2.

[0025] Working principle: The wind drill bit of the present invention forms reinforcement protection for the cross-shaped drill teeth 3 by means of the fan-shaped fixing block 2 arranged on the top of the drill bit steel body 1, which effectively prevents the cross-shaped drill teeth 3 from breaking after a short period of use. The drilling water enters the cavity structure of the drill bit steel body 1 and is ejected from the first borehole 6 and the second borehole 7. The size of the first borehole 6 is larger than that of the second borehole 7. The first borehole 6 is mainly used to soften the stratum. The four second boreholes 7 surrounding the first borehole 6 have high hydraulic strength, which destroy the stratum around the softened stratum. The first borehole 6 and the second borehole 7 cooperate to greatly improve the drilling efficiency. The hardness of the cemented carbide coating used in the wind drill bit of the present invention is 1.6-1.8 times that of ordinary mining cemented carbide, and the coating thickness only needs to be 0.5-0.8mm, so that the wind drill bit of the present invention has better wear resistance than ordinary wind drill bits.

[0026] The above-mentioned specific implementations are only specific cases of the present invention. The patent protection scope of the present invention includes but is not limited to the product form and style of the above-mentioned specific implementations. Any appropriate changes or modifications made to them by ordinary technicians in the technical field that conform to the claims of the present invention shall fall within the patent protection scope of the present invention.

Claims

1. A pneumatic drill head, characterized in that: The drill bit comprises a steel body, a fan-shaped fixing block symmetrically arranged on the top of the steel body, a cross-shaped drill tooth installed between the fan-shaped fixing blocks, and a conical drill tooth arranged at the edge of the cross-shaped drill tooth. The steel body is a cavity structure, a connecting thread is arranged at the lower end of the inner wall of the steel body, a first water hole connected to the cavity structure inside the steel body of the drill cylinder is arranged at the center of the cross-shaped drill tooth, a second water hole connected to the cavity structure inside the steel body of the drill bit is arranged on the fan-shaped fixing block, and a hard alloy coating is arranged on the surface of the conical drill tooth and the surface of the cross-shaped drill tooth; the aperture of the first water hole is larger than the aperture of the second water hole; the hard alloy coating is mainly composed of the following raw materials in parts by weight: 70-75 parts of tungsten carbide, 0.6-0.8 parts of carbonyl metal powder, 0.1-1.0 parts of vanadium carbide, 1-3 parts of titanium carbide, 0.01-0.03 parts of rare earth oxide, 0.05-0.08 parts of rhodium, and 0.6-1 parts of hafnium carbide.

2. A pneumatic drill head according to claim 1, characterized in that: A plurality of conical drill teeth are evenly arranged on the outer wall of the "cross" end of the cross-shaped drill tooth.

3. The pneumatic drill bit according to claim 1, characterized in that: The thickness of the cross-shaped drill teeth is 1.2-1.4 times the thickness of the fan-shaped fixing block.

4. The pneumatic drill bit according to claim 1, characterized in that: The cross-shaped drill teeth are fixed between the fan-shaped fixing blocks by welding.

5. The pneumatic drill bit according to claim 1, characterized in that: The thickness of the hard alloy coating is 0.5-0.8 mm.

6. The pneumatic drill head according to claim 1, characterized in that: The rare earth oxide is composed of yttrium oxide and scandium oxide in a mass ratio of 1:2.

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