A down-the-hole impactor

Abstract

A down hole hammer comprises a hammer main body. A rear connector is arranged on the rear portion of the hammer main body. A front connector is arranged on the front portion, a hollow hole channel is formed in a rear connector, a drill bit is connected with the front connector, a drill bit center hole is formed in the drill bit, the drill bit center hole is communicated with an inclined hole formed in the end face of the drill bit, a check valve is arranged at the position of an outlet of the hollow hole channel in the hammer main body, and a distribution rod in the hammer main body and a valve seat of the check valve are of an integrated structure, are used for introducing compressed air to the outside of a cylinder body and further achieve distribution action of piston movement with the cylinder body and a piston. The piston is installed in an inner cylinder and moves in the inner cylinder and an outer sleeve. The front portion of the piston is guided through a guide sleeve, the front end of the piston is matched with the drill bit, and a center air hole in the piston is communicated with the drill bit center hole. The front portion of the piston is guided by the guide sleeve, the front end of the piston is matched with the drill bit, and the center air hole in the piston is communicated with the drill bit center hole. The down hole hammer adopts the innovated piston structure, the distribution rod, the inner cylinder and the rear connector are designed in assembly, and the innovated clamping ring is assembled with the front connector, so that the whole hammer is reasonable in structure and high in working efficiency and meanwhile reduces production cost.

Description

technical field [0001] The invention belongs to the technical field of impactor manufacturing, and in particular relates to a down-the-hole impactor with a new structure. 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 [0003] hole working mechanism. 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. At present, the down-the-hole impactor used on the market is a DHD series valveless double-cylinder structure down-the-hole impactor represented by Ingersoll Rand. 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 guidance. This valveless down-the-hole impactor has the following di...

AI Technical Summary

Problems solved by technology

[0004] 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 Seriously affect the matching accuracy between the various components, thereby reducing work efficiency and shortening the working life of the impactor

[0005] 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 that affect the service life and stability of the impactor

[0007] 4. There are more intake and exhaust passages, resulting in greater air pressure loss

[0008] 5. There are many gas distribution channels on the piston, the gas 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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