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Journal of Mining Sciences

2017 year, number 5

Effect of Powered Closure Stability of Elastic Valve on Efficiency of Air Hammer Drills

V. V. CHERVOV, I. V. TISHCHENKO
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
Keywords: пневмомолот, упругий клапан, давление воздуха, объем камеры, зазор, ход ударника, диаметр камеры, air hammer drill, elastic valve, air pressure, hammer volume, clearance, hammering unit travel, chamber diameter

Abstract

In focus of the studies is the influence exerted by the radial displacement of the hammering unit on the air distribution in the air hammer drill with the ring-shape elastic valve. The minimal allowable volume of the backstroke chamber at the frontmost position of the hammering unit when it contacts the anvil is calculated with regard to the limited maximum pressure in the impact stroke chamber at the moment of the blow. In the capacity of the air hammer drill efficiency criterion, it is suggested to use the length of the powered closure of the elastic valve, that compensates rotation of the hammering unit in the body when the radial clearance between these parts grows. The parameters of the air distribution system are estimated for all sizes of air hammer drills with the ring-shaped elastic valves.