Ground drilling hammer and the driving method

Abstract

Disclosed herein is a pneumatic operated hammer for rock drilling, the hammer comprising a cylindrical casing, a back head mounted at an upper portion of the casing, a check valve for opening / closing a compressed air passageway in the casing, a guide for supporting the check valve, a piston adapted to ascend and descend with compressed air in the casing, and a button bit for performing a drillingwork through the striking of the piston. The piston is extended to a certain length to conform to the work condition of the pneumatic hammer to thereby prevent a water back-flow phenomenon in which underground water, etc., is introduced into the drilling equipment during the drilling work, compressed air passageways and variable compressed air chambers are formed between the piston and the casingso that when the piston ascends by the compressed air, it abruptly ascends at a load-free state, and the piston has axial portions with a reference diameter and different outer diameters so that it is possible to manufacture a hammer bit having a plurality of variable compressed air chambers formed between the casing the piston to fit for the work capacity. The piston ascended in a load-free state strikes the button bit with its rapid and strong striking force produced by the compressed air supplied from the variable chambers while abruptly descending to thereby perform the drilling work.

Description

technical field [0001] The present invention relates to a pneumatic hammer for rock drilling and drilling operations in formations and rocks and a driving method thereof, and more particularly, to such a pneumatic drilling hammer and a driving method thereof in which some air passages are uniformly Spaced concentrically around the central axis of the back head, the compressed air required for driving the hammer is supplied in a central and distributed manner, extending the piston to a certain length In order to meet the working conditions of the pneumatic drill hammer, thus preventing the phenomenon of water backflow, such as groundwater flowing into the drilling equipment during drilling operations, the outer diameters of the corresponding axial parts of the piston are made to be different between the piston and the piston sleeve. A variable air pressure chamber is formed between them, so that when the piston rises due to the compressed air, it is in an unloaded state and ris...

AI Technical Summary

Problems solved by technology

However, this patent also has some disadvantages, the supply of pressurized air is carried out only through the opening of the central channel of the piston and the outlet of the intake pipe, so that the function of the compressed air for the ascent and descent, such as the ascent and descent movement of the piston, is not are effectively implemented, and because the arithmetic ratio of resistance and density of the components is applied to the hammer, the hammer does not have the function of preventing groundwater or mud backflow during actual drilling operations

[0004] Moreover, because the check valve for selectively blocking the pressurized air is easily worn or exceeds the fatigue strength due to frequent strikes, and thus suffers from partial cracking or damage, resulting in frequent stoppage of the drilling operation

As a result, operating efficiency is reduced and drilling equipment is difficult to repair and maintain

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