Quick-percussion, wear-resistant and long-service-life down-the-hole percussive drill tool

Abstract

The invention discloses a quick-percussion, wear-resistant and long-service-life down-the-hole percussive drill tool. A check valve spring is arranged between a check valve and an air distributor; a drill bit sleeves a front joint; a bush is connected with the tail of the drill bit in a sleeving manner; a snap ring is arranged between the front joint and the bush; a piston is a hollow cylinder; a piston large end is arranged on the piston; a piston small path is arranged at one end of the piston large end; a piston tail path is arranged at the other end of the piston large end; one section of the piston large end is a smooth cylinder; the other section of the piston large end is uniformly provided with air grooves; an air polyhedron is arranged between the piston small path and the piston large end; an annular ventilating groove is formed between the air polyhedron and the piston large end; the piston tail path is connected with a cylindrical end; a piston tail end is arranged at the tail end of the cylindrical end; plain-sawn air grooves are uniformly formed in the piston tail end; front air holes are uniformly formed in one end of an inner cylinder; tail oblique air holes are uniformly formed in the other end of the inner cylinder; and a trapping lug boss is arranged on an inner cavity of the inner cylinder. The quick-percussion, wear-resistant and long-service-life down-the-hole percussive drill tool is high in drilling speed, not easy to jam, low in failure rate and low in energy consumption; work efficiency is greatly improved; and energy and cost are saved.

Description

technical field [0001] The invention belongs to the technical field of impactor manufacturing, in particular to a fast-moving, wear-resistant, high-life 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 foundation ...

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 / s), the material requirements are not high; with the rapid development of my country's modern industry, the production of high-performance air compressors with high wind pressure (above 3.4Mpa), 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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