A kind of high-pressure quick-flushing down-the-hole percussion drilling tool

Abstract

The invention discloses a high-pressure fast punching down-the-hole impact drilling tool. An elastic washer is arranged between the air distribution seat and the rear joint; a snap ring is arranged between the front joint and the bushing; One end of the large end is provided with a small diameter of the piston, and the other end is provided with a piston tail diameter; on the large end of the piston, one section is a smooth cylinder, and the other section is uniformly provided with an air passage groove; an annular ventilation groove is provided between the air passage groove and the smooth cylinder The small diameter of the piston is provided with an annular boss near the big end of the piston; the annular boss forms a buffer air cavity with the big end of the piston, the outer cylinder and the bushing; the piston tail diameter is connected with a cylindrical end; the end of the cylindrical end is provided with a piston tail; One end of the cylinder is evenly equipped with front air holes, and the other end is evenly equipped with tail oblique air holes; the inner wall of the inner cylinder is evenly equipped with arc grooves; a compressed air chamber is arranged between the arc grooves and the tail oblique air holes. It has fast drilling speed, is not easy to get stuck, has low failure rate and low energy consumption, which greatly improves work efficiency and saves energy and cost.

Description

technical field [0001] The invention belongs to the technical field of impactor manufacturing, and in particular relates to a high-pressure quick-flushing down-the-hole impact drilling tool. Background technique [0002] Pneumatic down-the-hole impactor, also known as pneumatic down-the-hole hammer, is a pneumatic mechanical drilling tool that uses compressed air as power to push the hammer (piston) to hit the drill bit to form a hole in the gravel; the impactor and the drill bit are in the rock drilling process In the drill pipe connection, it dives into the hole to break the rock at the same time, and the working efficiency is not affected by the hole depth; hence the name of the down-the-hole hammer. Pneumatic down-the-hole hammer drilling technology is widely used in blast hole construction, hydrological well drilling, geological core exploration, reservoir dam foundation curtain grouting, engineering geological exploration, trenchless pipeline laying, building foundatio...

AI Technical Summary

Problems solved by technology

[0003] The existing pneumatic down-the-hole impactors in our country are limited by the wind pressure provided by the air compressor (below 1.9Mpa) or continue to use the low-pressure down-the-hole drilling rigs and drilling tools imported from abroad in the past, such as figure 1 In addition, the processing technology of the main parts (such as piston and inner cylinder) of the valveless impactor at that time was complicated, and there was a big gap between the material and heat treatment process and foreign countries; For impactors with low impact frequency (below 20 times / second), the use of materials is not demanding; with the rapid development of my country's modern industry, the production of high-performance air compressors with high wind pressure (above 3.5Mpa), my country's existing The use of the impactor often has problems such as hammer breakage, low drilling speed and jamming of the impactor during use, which can no longer meet the needs of modern industrial production.

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