DOUBLE-ACTING HYDRAULIC IMPACT MACHINE WITH A CONTROLLED FORWARD STROKE CHAMBER Russian patent published in 2018 - IPC E21B1/24 E21C37/22 E02D7/02 

FIELD: mining; construction.

SUBSTANCE: invention relates to hydraulic shock action devices used in mining and construction for drilling and impact sinking of rod elements in the ground, when crushing oversized materials and etc. Machine comprises a housing with channels for supply and discharge of working fluid, a hydraulic control valve with a control channel, a striker, a hydraulic accumulator, a backward stroke chamber, a forward stroke chamber formed between the housing and the striker, wherein the backward stroke chamber and the accumulator is permanently connected to the pressure line, and the forward stroke chamber through the hydraulic control valve is alternately connected to the pressure line and the accumulator or to the drain. Backward stroke chamber is connected to the forward stroke chamber by a channel with a hydraulic lock installed in it with the possibility of flowing the working fluid in the direct stroke of the striker, bypassing the hydraulic control valve, from the backward stroke chamber to the forward stroke chamber.

EFFECT: hydraulic losses in the connecting lines of the hydraulic system are reduced.

1 cl, 1 dwg