Multistage cuttings discharge air-screw motor for underground coal mine drilling

Abstract

A multistage cuttings discharge air-screw motor for underground coal mine drilling comprises a connector, a motor assembly, a universal shaft assembly, and a transmission shaft assembly; the motor assembly inputs compressed air for rotation driving, the universal shaft assembly and the transmission shaft assembly transmit power, a single-bend outer pipe of the universal shaft assembly can provide directional drilling, and the motor assembly is provided with a continuous right-handed spiral groove; when rotating, the screw motor stirs depositing cuttings, assisting air in discharging the cuttings out of a borehole; multistage cuttings discharge is achieved by adding two sets of reverse bypass holes, and it is ensured that the motor can still normally rotate to discharge powder when a bit blocks at the bottom of the borehole or cuttings accumulate at the bottom; by providing a one-way valve, high-pressure gas is avoided carrying the cuttings reversely into the motor, causing damage to the motor. The multistage cuttings discharge air-screw motor is used with an underground while-drilling measuring system in the construction of long boreholes along an underground coal mine broken-soft coalbed, cuttings discharge effect can be improved, intra-borehole resistance is decreased, construction safety is ensured, and construction depth of boreholes along underground coal mine broken-soft coalbeds and coalbed drilling catching ratio are increased.

Description

technical field [0001] The invention relates to the technical fields of mine drilling, oil drilling and coal mine drilling, in particular to a coal mine underground drilling multi-stage drill used in conjunction with a coal mine underground measurement while drilling system for long drilling construction along broken soft coal seams. Slag air screw motor. Background technique [0002] Drilling holes for gas drainage in soft and broken coal seams are prone to hole collapse and drill sticking, which makes it difficult to form holes; while rotary drilling is used, it is difficult to control the drilling trajectory, and it is easy to drill to the top (bottom) of the coal seam. Rock, it is difficult to implement long drilling in the coal seam, resulting in uneven gas drainage, blind areas of drainage, and potential safety hazards. Therefore, at present, the key problem in the drilling construction of gas drainage in soft and broken coal seams is the problem of hole formation bas...

AI Technical Summary

Problems solved by technology

For soft coal seams, the slagging problem must be considered when using the air drilling process to ensure the smoothness of the hole. However, the external flat structure of the general screw motor is similar to the drilling construction of the external flat drill pipe during the drilling process, which is very uncomfortable. Good for slagging

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