Piston guide sleeve type valveless double-cylinder down-hole hammer

Abstract

A piston guide sleeve type valveless double-cylinder down-hole hammer comprises a rear connector, a check valve, an air distributing rod, a piston, a cylinder body, a guide sleeve, a clamping ring, a drill body and a front connector. The check valve is a one-way valve and is provided with a valve seat and a spring. The piston is a long and thin piston with a duct, the air distributing rod and an air inlet base at the rear end of the check valve are of an integrated structure, an inner cylinder is arranged in the cylinder body and on the outer sides of the air distributing rod and the piston, and in a piston moving process, the matching end of the piston and the air distributing rod is arranged in the inner cylinder all the time. The air distributing rod and the check valve seat are integrated, the structure is simple, functions of location, damping and air suction can be achieved, and the hammer is stable and reliable during working. The piston is free of a radial hole structure, compressed air can reach a front air cavity and a rear air cavity through the shortest paths, and hammer efficiency is improved.

Description

technical field [0001] The invention relates to a pneumatic impact device, in particular to a piston-guiding sleeve type non-valve double-cylinder down-the-hole impactor. Background technique [0002] The valveless down-the-hole hammer is a typical pneumatic impact device. It is the drilling tool of the down-the-hole drilling rig and the working mechanism of the drilling rig for drilling. This equipment is mainly used for drilling blast holes with a diameter of 65-305mm and a hole depth of 60m. The drilling efficiency of a down-the-hole drilling rig depends largely on the performance of the impactor. [0003] At present, the valveless down-the-hole impactor used in the market is a Mission series piston-guided sleeve type valveless single-cylinder structure down-the-hole impactor represented by Sandvik Mission, Sweden, see figure 1 Shown: The Mission series valveless impactor is composed of 16 parts, and the rear joint 1 with API thread is the part that connects the impacto...

AI Technical Summary

Problems solved by technology

[0004] The above valveless single-cylinder down-the-hole impactor has the following disadvantages: 1. The gas distribution rod, valve seat and rear joint are rigidly connected by a horizontal pin, and the horizontal pin is easily deformed or even broken in the early stage; 2. The hole processing with the horizontal pin High precision requirements are difficult to guarantee, and inconvenient loading and unloading; 3. The air distribution rod is long and has a large air supply hole. It works in a floating mode, which is prone to early fractures and reduces the reliability of the impactor during operation; 4. There are More intake and exhaust passages, resulting in greater air pressure loss; 5. There are more air distribution holes on the piston, the air passages are turning and the distance is long, and the gas pressure loss is large, making it sensitive to heat treatment and stress concentration. Work is often damaged early due to technological and structural reasons

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