HYDRAULIC SHOCK MACHINE Russian patent published in 2013 - IPC E21B1/28 E02D7/10 E21C37/00 

FIELD: mining.

SUBSTANCE: machine includes case, striker, forward stroke chamber, reverse stroke chamber, and additional chamber in the case, work fluid inlet and discharge ducts between case and striker, control duct and additional duct, tool, work fluid supply, accumulator, hydraulic distribution valve connecting forward stroke chamber either with work fluid supply or with drain to a tank; control chamber of hydraulic distribution valve is permanently connected via control duct to additional chamber, and distribution valve slide is spring-loaded by a load equal to force in control chamber of hydraulic distribution valve at work fluid pressure equal to P3 preset value. Forward stroke chamber is connected via hydraulic distribution valve to work fluid supply, accumulator and reverse stroke chamber by additional duct via reverse valve when strike is delayed and the system reaches preset P3 pressure value before forward stroke of striker, or by additional duct via reverse valve and by work fluid inlet and discharge duct from forward stroke chamber when striker starts forward stroke. Additional chamber is connected to work fluid supply, accumulator and reverse stroke chamber at the end of reverse stroke of striker, and to drain to a tank at the end of forward stroke of striker. Case, striker and work fluid inlet and discharge duct of forward stroke chamber can form closed circuit of work fluid in forward stroke chamber at the end of reverse stroke of striker.

EFFECT: enhanced efficiency of hydraulic shock machine, improved seismic signal due to elimination of repeated impact of striker on tool by delaying the striker before forward stroke starts.

1 dwg