Small-aperture rock breaking drill bit

Abstract

The invention relates to a small-aperture rock breaking drill bit which comprises a drill bit connecting part; an external blade and a central blade are arranged at the top of the drill bit connectingpart; the external blade is arranged at the outer side of the central blade; external rock cutting blades are arranged on the external blade; the external rock cutting blades are arranged on the outer edge of the drill bit connecting part; central rock cutting blades are arranged on the central blades and arranged between the external rock cutting blades; a drill bit central hole is formed in thecenter of the drill bit connecting part; bilateral inclined holes are formed in the top of the drill bit central hole; and the two ends of the bilateral inclined holes are arranged on the outer sideof the drill bit center hole and the outer side of the drill bit connecting part respectively. The small-aperture rock breaking drill bit has the advantages that the rock breaking speed is increased,and the drilling slag production size is reduced.

Description

technical field [0001] The invention relates to the technical field of roadway (tunnel) support, in particular to a small-diameter rock-breaking drill bit. Background technique [0002] Drilling in coal and rock mass is an important form of coal and rock cutting. According to the needs of the project, the depth and direction of the drilling will be different. In the construction of mine production, geological drilling, oil exploitation, etc., it is often necessary to drill several meters to thousands of meters. For drilling holes with different depths and orientations, the rock-breaking efficiency is the key factor affecting the hole-forming speed. Relevant studies have shown that during the hole-forming process of the existing small-aperture (drilling diameter less than 32mm) wing-type rock-breaking drill bit, the middle area of ​​the hole bottom A columnar structure will be formed. Since the rock column structure cannot be cut by the drill bit blade, it will seriously hind...

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Problems solved by technology

[0002] Drilling in coal and rock mass is an important form of coal and rock cutting. According to the needs of the project, the depth and direction of the drilling will be different. In the construction of mine production, geological drilling, oil extraction, etc., it is often necessary to drill several meters to thousands of meters. For drilling holes with different depths and orientations, the rock-breaking efficiency is the key factor affecting the hole-forming speed. Relevant studies have shown that during the hole-forming process of the existing small-aperture (drilling diameter less than 32mm) wing-type rock-breaking drill bits, the middle area of ​​the hole bottom A columnar structure will be formed. Since the rock column structure cannot be cut by the drill bit blade, it will seriously hinder the drilling process and greatly reduce the rock-breaking efficiency. In addition, the rock column in the center of the hole bottom is broken by the non-cutting force, making the It generates large-sized drilling slag, which may block the slag discharge channel, which will seriously affect the slag discharge efficiency, thereby restricting the hole forming efficiency. Therefore, a small-diameter rock-breaking drill bit is developed to ensure that the rock at the bottom of the hole is completely cut. It can effectively increase the rock-breaking speed and reduce the size of drilling slag, which is of great significance for improving the hole-forming efficiency of small-diameter drilling

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