Reverse circulation drill for geological prospecting, and power head thereof

Abstract

The invention provides a reverse circulation drill for geological prospecting, and a power head of the reverse circulation drill. The reverse circulation drill for geological prospecting is high in drilling efficiency. The power head comprises a rotating joint, a rotary box and a gas distributor, wherein the rotating joint, the rotary box and the gas distributor respectively comprise a rotating shaft, a main shaft and a mandrel which are hollow shafts arranged in a coaxial through way and are sequentially connected in a sealing way; the outer end of the rotating shaft is provided with a slag discharge hole; the main shaft is connected with a driving motor; the mandrel is internally provided with an inner tube in a coaxial way; the inner end of the inner tube is connected with the inner wall of the mandrel in a sealing way; the inner end of the inner tube is communicated with a hollow part of the main shaft is through; the outer diameter of the inner tube is smaller than the inner diameter of the mandrel; and at least one air inlet is arranged along the circumferential direction of the inner end of the mandrel, and compressed air enters the mandrel from through the air inlet. All the parts of the power head are independent of one another, so that the power head is convenient to assemble and disassemble; therefore, the sampling process is simplified, the quality of a sample is guaranteed, and the exploration efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a power head for a reverse circulation drilling rig. The present invention also relates to a reverse circulation drilling machine with the above-mentioned power head. Background technique [0002] In geological exploration, the power head is an important part of the drilling rig. Its main function is to drive the drill pipe to rotate and transmit the torque to the drill bit through the drill pipe to achieve the purpose of rock-breaking drilling. [0003] Existing exploration drilling rigs are mainly core drilling rigs, which use the rotary action of the tubular drill bit to cut and grind rocks, and continuously drill deep to extract cores. Since the existing core drilling rigs mainly use the grinding process for drilling, its It takes a long time, is inefficient, and cannot meet the requirements of the construction period. [0004] The impact reverse circulation ...

AI Technical Summary

Problems solved by technology

[0005] However, existing reverse circulation drilling rigs are mainly water well drilling rigs, and its working method is to drive mud from between the drill pipe and the borehole, and then extract it from the inside of the drill pipe. It will continue to wear and tear. If it is not replaced in time, the mud will leak into the bearing cavity and the box, which will affect the service life of the bearing and gear.

More importantly, during the drilling process, the cuttings will be discharged from the inside of the drill pipe together with the mud. The cuttings mixed with the mud are difficult to serve as samples for geological exploration and cannot be used for geological exploration

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