Special anti-impact drill bit

A drill bit and drill body technology, used in drill bits, drilling equipment, earth-moving drilling, etc., can solve the problems of poor gas anti-shock pressure effect, chip removal and blocking, and the drilling depth cannot reach the design target, etc., and improve drilling efficiency. Effect
CN108915599AActive Publication Date: 2018-11-30山东兖能泰德重工有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
山东兖能泰德重工有限公司
Publication Date
2018-11-30

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Abstract

The invention relates to a special anti-impact drill bit. The special anti-impact drill bit comprises a drill body connected with a bit holder at the tail. A cutting edge with combination of curve distribution and a trapezoidal structure is arranged at the front portion of the drill body and is a cylindrical coated alloy welded to a three-wing structure. A cutting part of the drill body is in a curve shape; and the shape of a first outer arc-shaped section is determined according to the following formula (1), the formula of the shape from a first endpoint a to a second endpoint b is shown (please see the specifications for the formula), L1 represents the arc length of the first outer arc-shaped section, R represents the radius of the drill bit, and alpha represents the central angle from the first endpoint a to the second endpoint b. According to the special anti-impact drill bit, the front portion of the drill body is arranged in a trapezoid and curve type combined mode, the combiningstrength of the first outer arc-shaped section and the drill body serves as a benchmark parameter, when the drill bit works, a fixed stress intensity value is maintained, thus the blocking situationis avoided, and the well-drilling efficiency is further improved.
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Description

technical field

[0001] The invention relates to the technical field of drilling tool accessories for engineering drilling and coal seam prospecting, in particular to a special anti-shock drill bit. Background technique

[0002] In many mines in my country, the coal seams have poor air permeability, soft coal quality, high gas content, and even dynamic phenomena or outburst dangers, making it extremely difficult to drill coal seam pre-drainage boreholes. When drilling with conventional water circulation, it is easy to collapse the hole, cause serious drill sticking, and the drilling depth cannot reach the design target, resulting in poor gas discharge and anti-rock impact effects, which cannot well meet the requirements of production and development, and affect the normal production of coal mines. conduct.

[0003] The drill bit in the prior art requires a pile head with a certain height on the top of the pile due to the design requirement in construction, and the existing d...

Claims

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