Piston tail pipe type impacter of valveless single-cylinder type downhole

Abstract

The invention discloses a piston tail pipe type impacter of a valveless single-cylinder type downhole, which comprises a cylinder body, a rear joint, a front joint and a drill bit; an air distributing seat provided with an axial air-distribution seat pore canal is hermetically arranged in a cylinder body; a check valve is arranged on the air distribution seat; an air distribution rod is provided with an air distribution rod big end and an air distribution rod small end; the air distribution rod and a check valve seat are of an integrated structure; the air distribution rod small end is arranged in a piston air-supply chamber on a piston; the inner diameter of a middle part of a piston air-supply chamber is more than the outer diameter of the air distribution rod small end; the piston is provided with a piston big end and a piston small end; a rear air chamber is formed between the air distribution rod and the piston small end; a front annular channel and a rear annular channel are formed between the cylinder body inner wall and the cylinder body outer wall; a piston surface air groove is formed on the outer surface of the piston; and a front air chamber is formed between a drill bit tail pipe and a piston big end. The piston tail pipe type impacter of the valveless single-cylinder type downhole, provided by the invention effectively overcomes the defects of the traditional impacter of the valveless single-cylinder type down hole, and has the advantages of high working efficiency, good reliability and greatly increased pneumatic efficiency.

Description

technical field [0001] The invention relates to a pneumatic percussion drilling equipment, in particular to a piston tailpipe type non-valve single cylinder high-efficiency down-the-hole impactor used in mines, engineering drilling and blasting. Background technique [0002] The main feature of the existing domestic piston tailpipe type valveless single-cylinder down-the-hole impactor is that the large end of the piston impacts the drill bit when the piston moves, and the small end of the piston interacts with the cylinder body for gas distribution and guidance, which has the following disadvantages: [0003] 1. There is a rubber ring between the valve seat and the rear joint, which can absorb a certain amount of energy when the impactor is working, and the rubber is easy to age and deform after the impactor works for a period of time, which will cause vibration and seriously affect all parts. The accuracy of fit between components reduces work efficiency and shortens the wo...

AI Technical Summary

Problems solved by technology

[0003] 1. There is a rubber ring between the valve seat and the rear joint, which can absorb a certain amount of energy when the impactor is working, and the rubber is easy to age and deform after the impactor works for a period of time, which will cause vibration and seriously affect all parts. The precision of fit between parts reduces work efficiency and shortens the working life of the impactor

[0004] 2. The air distribution rod, the valve seat and the rear joint are rigidly connected by means of cross pins. The vibration and reaction force generated by the impactor during operation cannot be eliminated or weakened and are transmitted to the drilling rig, reducing work efficiency and causing machine parts to be damaged and scrapped early.

[0005] 3. The air distribution rod is long and has a large air supply hole. It works in a floating way, which is prone to early fracture and reduces the reliability of the impactor when it is working.

[0006] 4. There are more intake and exhaust passages, resulting in greater air pressure loss

[0007] 5. There are many air distribution channels on the piston, the air channel turns and the distance is long, and the gas pressure loss is large, which makes it sensitive to heat treatment reaction, stress concentration, and often fails early due to process and structural reasons.

Images