Valveless single-cylinder low or middle wind pressure downhole air hammer

Abstract

A valveless single-cylinder low or middle wind pressure downhole air hammer comprises an outer sleeve with one end being a rear joint and the other end being a drill bit. A check valve is arranged in the outer sleeve and internally provided with a flexible spring. One end of an air distribution pole is provided with a radial hole and matched with a piston in which a central pore path is arranged. The central pore path is provided with an inner ring groove thereon. The lower part of the piston is provided with an upper air hole that is communicated with the inner ring groove through a slant hole, while the upper part thereof is provided with an air duct. One end of an upper slant hole is communicated with the air duct, while the other end thereof is matched with the radial hole. The piston is matched with the drill bit and a guide sleeve. A valve seat is provided with a locating device. The air hammer enlarges the effective working diameter of the cylinder body, causes the piston to obtain high impact energy, simplifies an air distribution path, reduces gas pressure loss, can be used under low or middle wind pressure to improve the down-the-hole rock drilling efficiency and reduce energy consumption. The locating device solves the locating and guiding problem of the air distribution pole, thus causing the hammer to operate with high efficiency and stability.

Description

technical field [0001] The invention relates to a pneumatic percussion drilling equipment, in particular to a valveless single-cylinder type medium and low wind pressure down-the-hole hammer used for drilling blast holes in mines and engineering. Background technique [0002] The low wind pressure down-the-hole impactor currently used is a valved double-cylinder type, the outer casing and the cylinder form an inner and outer cylinder, and the air distribution mechanism has a valve plate, and the compressed air sent to the impactor through the drill pipe is displaced through the valve plate They are respectively sent to the front and rear air chambers of the piston alternately, so that the piston reciprocates to impact the drill bit, and the impact energy is applied to the bottom of the rock blasting hole, and rotates together with the rotary mechanism of the drilling rig to form a hole. This type of down-the-hole impactor has some disadvantages: First, due to the complex str...

AI Technical Summary

Problems solved by technology

This type of down-the-hole impactor has some disadvantages: First, due to the complex structure, there are many parts that need to move with each other, resulting in large air consumption, high energy consumption, and low work efficiency; second, the valve plate moves frequently and is easily damaged, resulting in failure; The third is that the scope of application is small, and it can only be used in low wind pressure (pressure 5-8Kg / cm 2 ) range to use

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