Closed-type direct-reversed circulation impactor

Abstract

A closed-type direct-reversed circulation impactor is a boring and drilling tool for rapid rock drilling and is applied to various geotechnical engineering construction. The closed-type direct-reversed circulation impactor comprises a concentric three-channel short circuit, an upper joint, an upper outer pipe, a reducing ventilation sleeve, a spacer bush, a central air distribution seat, a cylinder sleeve, a lower outer pipe, a core tube, a piston, a jump ring, a retaining sleeve, a semicircle clamp, a spine housing and a drill bit. The scheme of connection of a three-channel concentric drilling rig and central air distribution is adopted, maximum effective working area of the working piston of the impactor is achieved, single impacting energy of the closed-type direct-reversed circulationimpactor is remarkably improved, and drilling efficiency of the impactor is further improved; the problem about infiltration of flushing liquid in contact seal is further solved by designing bidirectional synergetic check valves on the basis of the above structure, the air-intake check valve and the air-return check valve are operated synergetically to commonly complete opening and closing operations, operation reliability of the impactor is improved, operation life of the impactor is prolonged, and long-term, stable and efficient operation of the impactor is benefited.

Description

technical field [0001] The invention is a kind of drilling and drilling equipment for drilling rocks, which is used in various geotechnical engineering constructions, including foundation engineering, mining, hydrology and water well drilling, geological exploration, oil drilling and geothermal wells and other geotechnical drilling. field. Background technique [0002] Pneumatic hammer is an effective drilling tool for quickly drilling hard rock, and has been widely used in various geotechnical engineering. However, in the actual use of the project, there are many technical problems and deficiencies when drilling in strata with complex geological conditions, strata rich in groundwater, and deep holes. Especially with the increase of borehole diameter, the problem of chip removal is prominent. To a certain extent, it limits the application and development of this technology. [0003] The closed positive and negative cycle pneumatic impactor uses two working media, using com...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a closed reverse circulation impactor for the problems of insufficient single impact work and the partial blockage of the air return passage and large pressure loss along the way of the existing closed reverse circulation impactor. Positive and negative cycle impactor

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