PERCUSSION DEVICE Russian patent published in 2007 - IPC E21C37/00 

FIELD: engineering of percussion devices meant for destroying, crushing and pressing rocks and other rock-like materials; possible use, for example, in mining industry as replaceable rigging on excavators, tractors and other similar machines.

SUBSTANCE: percussion device contains body, along the axis of which striker piston with circular shelf is positioned, together with body forming idle running chamber connected constantly to source of working liquid under pressure and piston hydro-pneumatic accumulator as well as working stroke chamber with circular braking hollows located in its end walls having diameter same as circular shelf of striker, connected in turns to draining or forcing lines through slide valve distributor. Slide valve distributor is made in form of a coaxial three-stepped bushing enveloping the striker piston, and is located in working stroke chamber, in each end wall of which except for braking hollow one circular control hollow is made, enveloping it from outside, closest one of which to idle running chamber is connected to braking hollow enveloped by it, and other one, positioned on opposite end wall of working stroke chamber, by means of pilot slide valve is connected in turns to either force line or working stroke chamber. Plunger of pilot slide valve is made in form of piston with rod, positioned in end wall of piston hydro-pneumatic accumulator on the side of its liquid hollow and together with aforementioned wall it forms piston hollow, connected to force line, and rod hollow, connected to draining line, while the rod of aforementioned plunger by its free end is constantly positioned in liquid hollow of hydro-pneumo-accumulator and is in contact with the end of its piston directed to the inside of this hollow.

EFFECT: simplified operation of device and increased reliability of same.

3 cl, 1 dwg