Efficient down-hole hammer

Abstract

An efficient down-hole hammer comprises a back joint, a check valve, an air distribution rod, a piston, a cylinder, a clamping ring, a drill head and a front joint. The check valve is a one-way valve and comprises a valve seat, a spring and a steel washer. The slotted piston is provide with a hole, a positioning sleeve is arranged at the back end of a valve end cover, and the air distribution rod, a positive vibration-proof rubber ring and a negative vibration-proof rubber ring are clamped in the positioning sleeve together. The efficient down-hole hammer is not provided with an inner cylinder structure, the air distribution mode is greatly innovated, a vibration-proof fine tuning device arranged between the back joint and the air distribution rod can effectively absorb counterforce of piston motion, the air distribution rod can be subjected to automatic fine tuning so as to keep the assembling verticality, the adaptive drill head is not provided with a tail pipe, and therefore high pressure air leakage is reduced, work efficiency is improved and production cost is reduced. In addition, the piston has a reliable service life.

Description

technical field [0001] The invention relates to a pneumatic impact device, in particular to a high-efficiency 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 on the market is a DHD series piston tailpipe valveless double-cylinder structure down-the-hole impactor represented by Ingersoll Rand Corporation of the United States. Its characteristic is that when the piston moves, the big end impacts the drill bit, and the small end of the piston interacts with the inner cylinder for gas distribution and guid...

AI Technical Summary

Problems solved by technology

[0005] 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. What is more prominent is that after the impactor has been working for a period of time, the aging deformation of the rubber will cause jumping and serious The influence of the matching accuracy between the various components reduces the work efficiency and shortens the working life of the impactor;

[0006] 2. The inner cylinder is a thin-walled part with complex processing and high production cost; because it is a vulnerable part, it is one of the key points affecting the service life and stability of the impactor;

[0008] 4. There are more intake and exhaust passages, resulting in greater air pressure loss;

[0009] 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.

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