Scraper bit for coal mine drilling

Abstract

The utility model discloses a scraper drill bit for coal mine drilling, which comprises a plurality of groups of drill bit fins and a drill bit matrix, the drill bit fins are fixed on one side of the drill bit matrix at equal intervals, and the drill bit fins are inclined towards the center of the drill bit matrix. A plurality of side protruding edges are fixed to the side faces of the drill bit fins at equal intervals, and a plurality of upper protruding edges are fixed to the tops of the drill bit fins. According to the drill bit, the drill bit fins are arranged on the outer side of the drill bit matrix, the multiple side protruding edges and the multiple upper protruding edges are arranged on the drill bit fins, side face cutting is achieved through scraping of the side protruding edges, the problem of sediment on the lower side in a hole is solved, meanwhile, for the situation that a drill hole track is raised, the drill hole can sink through repeated scraping of the drill hole, and therefore the drill bit is prevented from being damaged. The method is used for keeping the drill hole straight and improving the drill hole track, and has a good application effect.

Description

Technical Field

[0001] The utility model relates to the technical field of underground coal mine drilling, in particular to a scraper drill bit for coal mine drilling. Background Art

[0002] Broken and soft are typical characteristics of coal seams in the Huainan mining area. During the construction of underground coal seam extraction drilling, serious hole collapse is often caused due to this characteristic, and a large amount of drill cuttings are placed at the bottom of the hole, causing serious deviation of the drilling trajectory. After the introduction of pneumatic directional drilling technology, the same reason has made directional drilling difficult. The drilling trajectory is often upward and deflected, making it difficult to construct along the layer. However, most of the drill bits currently used are diamond composite piece PDC drill bits. The characteristics of this type of drill bit are strong rock cutting ability, but because of the small blade, the grinding ability of the hole wall is very weak. It is suitable for rock drilling, but not for drilling in broken and soft coal seams. For this reason, based on the above-mentioned deficiencies, this application proposes a scraper drill bit for coal mine drilling. Utility Model Content

[0003] The technical problem to be solved by the utility model is: how to improve the hole wall grinding ability to be suitable for drilling in broken soft coal seams.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0005] A scraper drill bit for coal mine drilling, comprising a drill bit blade and a drill bit matrix, wherein the drill bit blades are provided in a plurality of groups and are fixed at equal intervals on one side of the drill bit matrix, and the drill bit blades are inclined toward the center of the drill bit matrix;

[0006] A plurality of side cutting edges are fixed at equal intervals on the side of the drill wing, and a plurality of upper cutting edges are fixed on the top of the drill wing.

[0007] The present application arranges drill wing pieces on the outside of the drill bit body, and arranges a plurality of side cutting edges and upper cutting edges on the drill wing pieces. The side cutting is achieved by scraping with the side cutting edges, thereby solving the problem of sediment on the lower side of the hole. Meanwhile, in the case where the drilling trajectory has already risen, the borehole can be sunk by repeated scraping of the borehole, thereby ensuring that the borehole can be constructed along the coal seam. The present application has good application effects in maintaining drilling straightness and improving drilling trajectory.

[0008] As a further solution of the utility model: the side cutting edge and the upper cutting edge are both made of hard alloy material.

[0009] As a further solution of the utility model: the plurality of side cutting edges are arranged in an inclined shape, and the inclination direction is toward the top of the drill bit wing.

[0010] As a further solution of the utility model: the plurality of upper cutting edges are arranged in an inclined shape, and the inclination direction is away from the central axis of the drill bit matrix.

[0011] As a further solution of the utility model: the drill bit matrix includes a drill bit body, and a hollow groove is provided in the middle position inside the drill bit body.

[0012] As a further solution of the utility model: a drill tapered opening capable of increasing wind pressure is arranged at one end of the drill bit body close to the drill bit wing.

[0013] As a further solution of the utility model: a drill bit mounting buckle is arranged at one end of the drill bit matrix away from the drill bit wing.

[0014] As a further solution of the utility model: the drill bit fins are in a "flag"-shaped structure, and a slag discharge groove is formed between two groups of drill bit fins.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The present application solves the sediment problem on the lower side of the hole by continuously scraping and cutting the four wings of the four-wing scraper drill bit. At the same time, if the drilling trajectory has risen, the drilling hole can be sunk by repeated scraping and cutting to ensure that the drilling hole can be constructed along the coal seam. The present application has a good application effect for drilling straightness and improving drilling trajectory;

[0017] 2. The drill bit center of this application adopts the design of the entire large-diameter air outlet along the drill bit axis, rather than the side air outlet, which can ensure sufficient air supply without causing major disturbances to the hole wall and reduce the hole collapse phenomenon;

[0018] 3. The side cutting edge of the present application is made of carbide material and is used for coal seam drilling. Its production cost is lower. The side wing piece is relatively narrow and long, mainly to maintain the diameter of the coal hole and the linearity of the trajectory. In addition, the soft coal slag can be discharged from the front end surface of the drill bit along the gap of the side wing piece to form a slag discharge groove for slag discharge;

[0019] 4. The drill bit body is hollow. One end of the drill bit body close to the wing has a certain conical shape. The structure of this constriction is mainly used to increase the compressed air flow rate in the drill tool during the construction process, so as to have a certain impact on the coal cut by the front wing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A cross-sectional view of a scraper drill bit for coal mine drilling according to an embodiment of the utility model;

[0021] Figure 2 It is a right side view of a scraper drill bit for coal mine drilling according to an embodiment of the utility model;

[0022] Description of reference numerals:

[0023] 1. Drill bit blade;

[0024] 2. Side blade;

[0025] 3. drill bit body; 31. drill bit conical mouth; 32. drill bit mounting buckle; 33. drill bit body;

[0026] 4. Use the upper blade;

[0027] 5. Slag discharge chute. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Reference Figure 1 and Figure 2 A scraper drill bit for coal mine drilling, the drill bit is used in the underground soft coal area to eliminate the sudden directional long drilling technology process in the layer, mainly for correcting the directional hole trajectory that does not meet the design requirements formed by the original open and closed drill bit during the "soft coal directional" construction; specifically includes a drill bit wing 1, a side blade 2, a drill bit body 3, an upper blade 4 and a slag discharge groove 5, wherein the drill bit wing 1 is arranged in four groups and is fixed on the front side of the drill bit body 3 in a ring array, and the side blade 2 and the upper blade 4 are both installed on the drill bit wing 1.

[0030] For ease of understanding and description, Figure 1 The right end of the drill bit matrix 3 is the front side, and the left end is the rear side and is used as a reference. It should be understood that this orientation setting is only for the convenience of description and understanding, and cannot be understood as a limitation to the present application.

[0031] Reference Figure 1 and Figure 2 The drill wing 1 is a flag-shaped structure as a whole, that is, a flag-shaped structure, one horizontal end of which is fixed to the drill bit body 3 and can be fixed by welding to ensure the stability of the connection; the other end protrudes from the front side of the drill bit body 3.

[0032] Reference Figure 2The drill wing 1 is inclined toward the center of the drill bit body 3, and a number of side blades 2 are equidistantly fixed on the side of the drill wing 1, and a number of upper blades 4 are fixed on the top of the drill wing 1; further, the side blades 2 and the upper blades 4 are made of cemented carbide material, and the several cemented carbide upper blades 4 on the top of the drill wing 1 are mainly used to cut and sweep coal in the coal seam, and the several cemented carbide side blades 2 on the side of the drill wing 1 are relatively narrow and long, mainly to maintain the aperture of the coal hole and the linearity of the trajectory, and the soft coal slag can be discharged from the front end face of the drill bit along the gap between the adjacent drill wing 1 on the side to form a slag discharge groove 5.

[0033] It should be noted that the side blades 2 and the upper blades 4 are fixed to the drill wing 1 by welding, wherein the number of the side blades 2 and the upper blades 4 depends on the size of the drill wing 1, and is not limited in this application; and several side blades 2 are arranged in an inclined state, and the inclination direction is toward the top of the drill wing 1; several upper blades 4 are arranged in an inclined state, and the inclination direction is away from the central axis of the drill body 3.

[0034] Reference Figure 1 The drill bit body 3 is the main body of the drill bit, one end of which is a male buckle (or a female buckle) connected to a directional drill rod (or a screw motor); the other end is welded with four drill bit wings 1; the drill bit body 3 includes a drill bit tapered mouth 31, a drill bit mounting buckle 32 and a drill bit body 33, wherein a hollow groove is provided in the middle of the drill bit body 33, and the end of the hollow groove close to the drill bit wing 1 is a drill bit tapered mouth 31 capable of increasing wind pressure, and the end of the hollow groove away from the drill bit wing 1 is provided with a drill bit mounting buckle 32 for mounting a directional drill rod;

[0035] It should be noted that the drill bit matrix is ​​hollow and shaped like Figure 1 As shown, the end of the hollow drill body close to the wing has a certain conical shape. The structure of this closing mouth is mainly used to increase the compressed air flow rate in the drill tool during the construction process, so as to have a certain impact on the coal cut by the front wing.

[0036] The specific operating principles of this application are as follows:

[0037] The drill bit matrix 3 is the main body of the drill bit, one end of which is a male buckle (or female buckle) connected to the directional drill rod (or screw motor); the other end is welded with four drill bit wings 1, the shape of the wings is like a "flag" type, the front end of the drill bit wing 1 has a certain inclination angle, and a row of hard alloys are welded on the upper sink groove, which is mainly used to cut and sweep coal in the coal seam. Hard alloys are also welded on the side of the wing. The side wings are relatively narrow and long, mainly to maintain the aperture of the coal hole and the linearity of the trajectory, and the soft coal slag can be discharged from the front end face of the drill bit along the gap of the side wings to form a slag discharge groove; the drill bit matrix is ​​hollow and shaped like Figure 1As shown, the end of the hollow drill body close to the wing has a certain conical shape. The structure of this closing mouth is mainly used to increase the compressed air flow rate in the drill tool during the construction process, so as to have a certain impact on the coal cut by the front wing.

[0038] Due to the poor grinding ability at the bottom of the hole (coal hole drilling does not require strong bottom drilling ability), the present application increases the side cutting edge and improves the scraping and cutting ability of the hole wall. Therefore, the drill cuttings deposited at the bottom of the hole can be stirred by continuous scraping and then discharged by compressed air, avoiding the sediment at the bottom of the hole from padding the drill rod, thereby improving the straightness of the drilling hole.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A scraper drill bit for coal mine drilling, comprising a drill bit blade (1) and a drill bit matrix (3), characterized in that: The drill bit fins (1) are arranged in a plurality of groups and are fixed at equal distances on one side of the drill bit matrix (3); the drill bit fins (1) are inclined toward the center of the drill bit matrix (3); A plurality of side cutting edges (2) are fixed at equal intervals on the side of the drill wing (1), and a plurality of upper cutting edges (4) are fixed on the top of the drill wing (1).

2. A scraper drill bit for coal mine drilling according to claim 1, characterized in that: The side cutting edge (2) and the upper cutting edge (4) are both made of hard alloy material.

3. A scraper drill bit for coal mine drilling according to claim 1, characterized in that: The plurality of side cutting edges (2) are arranged in an inclined shape, and the inclination direction is toward the top of the drill bit wing (1).

4. A scraper drill bit for coal mine drilling according to claim 1, characterized in that: The plurality of upper cutting edges (4) are arranged in an inclined manner, and the inclination direction faces away from the central axis of the drill bit matrix (3).

5. A scraper drill bit for coal mine drilling according to claim 1, characterized in that: The drill bit matrix (3) comprises a drill bit body (33), and a hollow groove is provided at the middle position inside the drill bit body (33).

6. A scraper drill bit for coal mine drilling according to claim 5, characterized in that: A drill tapered opening (31) capable of increasing wind pressure is provided at one end of the drill bit matrix (3) close to the drill bit wing (1).

7. A scraper drill bit for coal mine drilling according to claim 5, characterized in that: A drill bit mounting buckle (32) is provided at one end of the drill bit matrix (3) away from the drill bit wing (1).

8. A scraper drill bit for coal mine drilling according to claim 1, characterized in that: The drill bit fins (1) are of a "flag"-shaped structure, and a slag discharge groove (5) is formed between two groups of drill bit fins (1).

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