Stepped concave three-wing coreless drill bit

Abstract

The utility model discloses a stepped concave three-wing coreless drill bit which comprises a drill bit body, cutting wings and diamond compacts, a drill rod connecting hole is formed in the bottom end of the drill bit body, the cutting wings are fixedly connected to the top end of the drill bit body, the three cutting wings are evenly distributed around the axis of the drill bit body, and hard alloy gauges are arranged at the front ends of the cutting wings. Water holes are formed in the top ends and the side walls of the cutting wings. The diamond compacts are fixedly connected to the top ends of the cutting wings, each cutting wing is provided with four diamond compacts, the four diamond compacts are distributed in a stepped mode, and the angle between each diamond compact and the axis of the drill bit body is 15 degrees, so that the problem that due to the fact that an existing cutting wing is too wide in width and too large in resistance, the efficiency is low during hard rock drilling is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of drill bits, in particular to a stepped concave three-wing coreless drill bit. Background Art

[0002] Diamond composite drill bits are usually used in coal mine gas drainage drilling, water hole drilling, geological exploration and engineering exploration drilling. Diamond composite sheets belong to a new type of superhard material, with a diamond layer on the surface and a cemented carbide layer on the bottom, which are pressed under high temperature and high pressure. As cutting wings, diamond composite sheets fill the gap between the previous cemented carbide and artificial gold, greatly improving the footage efficiency.

[0003] In the above engineering drilling, the commonly used one is a concave three-wing coreless drill bit. There are three wings at the edge and a concave in the center, with two or three columns. It can work normally when encountering soft rock formations, but when drilling hard rock, the footage is very slow, and it is necessary to increase the pump pressure, pump volume and rotation speed to work normally. At the same time, the increase in pump pressure and rotation speed is very likely to damage or even detach the diamond composite sheets on the cutting wings, ultimately resulting in the stop of drilling. Content of the Utility Model

[0004] The purpose of the utility model is to provide a stepped concave three-wing coreless drill bit to solve the problem that the existing cutting wings are too wide and have too much resistance, resulting in low efficiency when drilling hard rock.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A stepped concave three-wing coreless drill bit, including a drill bit body, cutting wings and diamond composite sheets. The cutting wings are fixedly connected to the top end of the drill bit body. There are three cutting wings evenly distributed around the axis of the drill bit body. The diamond composite sheets are fixedly connected to the top ends of the cutting wings. Each cutting wing is equipped with four diamond composite sheets, and the four diamond composite sheets are distributed in a stepped manner.

[0006] Preferably, the angle formed between the diamond composite sheet and the axis of the drill bit body is 15°.

[0007] Preferably, a cemented carbide gauge is provided at the front end of the cutting wing.

[0008] Preferably, a drill pipe connection hole is opened at the bottom end of the drill bit body.

[0009] Preferably, water holes are opened at the top end and the side wall of the cutting wing.

[0010] Principle and beneficial effects of this technical solution:

[0011] The diamond composite sheets on the cutting wings are distributed in a stepped manner, solving the problem that the diamond composite sheets on the cutting wings of the traditional concave three-wing coreless drill bit are arranged in parallel, resulting in too wide cutting wings and too much resistance, and effectively improving the footage efficiency during drilling. Description of the Drawings

[0012] Figure 1 The front view of a stepped concave three-wing coreless drill bit provided by an embodiment of the present utility model;

[0013] Figure 2 The top view of a stepped concave three-wing coreless drill bit provided by an embodiment of the present utility model;

[0014] In the figure: 1, drill bit body; 2, cutting wing; 3, diamond composite sheet; 4, carbide diameter protection; 5, water hole; 6, drill pipe connection hole. Detailed Embodiment

[0015] The following further describes the present utility model in detail in conjunction with the drawings and embodiments:

[0016] As Figure 1 shown, a stepped concave three-wing coreless drill bit includes a drill bit body, cutting wings and diamond composite sheets. A drill pipe connection hole is opened at the bottom end of the drill bit body. The cutting wings are fixedly connected to the top end of the drill bit body. Three cutting wings are evenly distributed around the axis of the drill bit body. Carbide diameter protection is provided at the front end of the cutting wings. Water holes are opened at the top end and the side wall of the cutting wings. The diamond composite sheets are fixedly connected to the top end of the cutting wings. Four diamond composite sheets are installed on each cutting wing and are distributed in a stepped manner. The angle formed between the diamond composite sheets and the axis of the drill bit body is 15°.

[0017] Specific implementation process:

[0018] When using this coreless drill bit, first, connect the drill bit to the device, drain water and cool down normally through the water holes. At the same time, the grooves between the cutting wings can timely discharge debris. When drilling, the diamond composite sheets on the inner side contact the object first, and the contact area is small. With the same force, the drilling efficiency is higher. The diamond composite sheets on the outer side contact the object later to ensure the size of the drilled hole, and perform an operation similar to reaming on the existing hole.

[0019] The above are only the embodiments of the present utility model. Well-known specific technical solutions or common knowledge such as characteristics are not described in detail here. For those skilled in the art, without departing from the technical solution of the present utility model, several deformations and improvements can still be made, which should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation methods described in the specification can be used to explain the content of the claims.

Claims

1. A stepped concave three-wing coreless drill bit, comprising a drill body, cutting wings and a diamond composite sheet, characterized in that: The cutting wing is fixedly connected to the top of the drill body, and three cutting wings are evenly distributed around the axis of the drill body. The diamond composite sheet is fixedly connected to the top of the cutting wing, and each cutting wing is equipped with four diamond composite sheets. The four diamond composite sheets are distributed in a stepped manner, and the angle between the diamond composite sheet and the axis of the drill body is 15°.

2. A stepped concave three-wing coreless drill according to claim 1, characterized in that: A hard alloy diameter guard is arranged at the front end of the cutting wing.

3. The stepped concave three-wing coreless drill bit according to claim 1, characterized in that: A drill rod connecting hole is provided at the bottom end of the drill bit body.

4. The stepped concave three-wing coreless drill bit according to claim 1, characterized in that: The top end and side wall of the cutting wing are provided with water holes.

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