A rotary drilling tool

Abstract

The invention discloses a novel rotary percussion drilling tool. The tool comprises an anti-dropping switching assembly, a motor assembly, a universal shaft assembly and a driving impact assembly. The interior of the anti-dropping switching assembly is provided with anti-dropping discs. An anti-dropping connecting rod is fixed by a spare fastening nut. An upper spherical joint and a lower spherical joint of the universal shaft assembly are connected to two ends of a spherically-hinged connecting rod through a movably articulated manner. Driving balls are utilized for transferring torque. The upper spherical joint is connected with a rotor of the motor assembly. The lower spherical joint is connected with a driving shaft of the driving impact assembly. One end of the driving shaft is connected with the lower spherical joint and the other end of the driving shaft is connected with a spline mandrel. The bottom of the spline mandrel stretches into a spline housing. The novel rotary percussion drilling tool has following beneficial effects: an impact generator is arranged in an open-type lubricating driving shaft assembly; the drilling tool is simple in structure; functions of rotary drilling and directional drilling for a bent housing of a common screw drill tool and a turbine drill can be fulfilled; and meanwhile, the function of an impact drill is also fulfilled so that drilling speed is effectively increased.

Description

technical field [0001] The invention belongs to the technical field of drilling, in particular to a rotary percussion drilling tool. Background technique [0002] At present, in domestic and foreign drilling construction operations, the relevant rotary and impact combined rock breaking technology has been verified. At present, only a small number of similar tools of large foreign companies have been successfully used in batches, but foreign companies have done a good job of keeping secrets. We It is impossible to see the internal structure of the drilling tool, and it can only be guessed from the appearance and functional description that its structural principle is the built-in impact generator in the drive shaft of the oil-sealed screw drilling tool. The structure of each company may be slightly different, and some domestic companies and research institutions are doing related research, either staying in theoretical research, or some related materials and technology are im...

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Problems solved by technology

[0002] At present, in domestic and foreign drilling construction operations, the relevant rotary and impact combined rock breaking technology has been verified. At present, only a small number of similar tools of large foreign companies have been successfully used in batches, but foreign companies have done a good job of keeping secrets. We It is impossible to see the internal structure of the drilling tool, and it can only be guessed from the appearance and functional description that its structural principle is the built-in impact generator in the transmission shaft of the oil-sealed screw drilling tool

The structure of each company may be slightly different, and some domestic companies and research institutions are doing related research, either staying in theoretical research, or some related materials and technology are immature, and the service life cannot meet the requirements of field use, so there has not been any Bulk promotion and use

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