A through-type down-the-hole impactor cross gas distribution device

Abstract

The invention discloses a cross gas distribution device for a through type down-hole hammer. The cross gas distribution device comprises an upper joint body, a lower joint body and an inner pipe, wherein an annular space formed between the inner pipe and the lower joint body, a vertical through hole in the upper section of the lower joint body, an upper through hole in the upper joint body and an inner circular hole jointly form an air inlet channel; the air inlet channel is communicated with a high-pressure air inlet channel of the through type down-hole hammer; a central hole of the inner pipe and a transverse through hole in the upper section of the lower joint body jointly form an exhaust channel; the exhaust channel is communicated with a low-pressure exhaust channel of the through type down-hole hammer; the air inlet channel and the exhaust channel are mutually independent. The cross gas distribution device for the through type down-hole hammer, disclosed by the invention, is connected between a single-channel drilling rod and the through type down-hole hammer, so that the through type down-hole hammer not only can realize reverse circulation drilling, but also can realize directional circulation drilling or rotary impact compaction drilling in required occasions such as a soft surface layer of a complex formation, and the through type down-hole hammer is enabled to form a reverse blowing operation effect.

Description

Technical field [0001] The invention relates to an auxiliary device for a through-type down-the-hole impactor, in particular to a cross-air distribution device for a through-type down-the-hole impactor. Background technique [0002] Drilling in complex formations often requires a combination of multiple drilling techniques, especially for formations with soil on the surface, sand and pebble layers mixed with boulders and boulders underneath, and strong or moderately weathered rock masses further deep, such as China Most areas within the Sichuan Basin in Southwest China have the above geological characteristics. [0003] High drilling efficiency can be obtained by applying the rotary drilling tool composed of the down-the-hole pneumatic impactor to the above-mentioned types of formations, and the through-type down-the-hole impactor is especially suitable for the above-mentioned complex formations. [0004] However, because the surface soil layer and sand and gravel layer are relative...

AI Technical Summary

Problems solved by technology

[0004] However, due to the relatively loose surface soil and sand and pebble layers, the through-type DTH impactor must follow the casing when drilling in conventional positive circulation, otherwise the hole will easily collapse; there are the following defects in following the casing: first, following the casing The operation of connecting and unloading drilling tools is relatively complicated, and the labor intensity of workers is high; second, the casing is severely worn in the sand and pebble layer, the frequency of repeated use is not high, and the consumption is large

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