ADJUSTABLE IMPACT MACHINE Russian patent published in 2013 - IPC E02D7/10 

FIELD: machine building.

SUBSTANCE: adjustable impact machine includes a housing, a hammer, chamber of forward and backward stroke, a working tool and a control device containing a spool valve and a stock interacting with it, a water motor, an exhaust nozzle, a control nozzle, a turning spring, a throttle and a working medium source. Spool valve is of rotating type, and a shaft is used as stock, on which spool valve, water motor and turning spring operating for closing of spool valve at absence of action of control pulse P_contr of working medium pressure on the water motor from the control nozzle are installed. Exhaust nozzle is connected via outlet and inlet holes of spool valve at its open position to backward-stroke chamber and through the above throttle to the working medium source; at that, exhaust nozzle and control nozzle are oriented to the water motor with possibility of the spool valve opening. Its housing is equipped with a control chamber, and control device is equipped with a vacuum ejector, a check valve and a vacuum control connected to the forward-stroke chamber. Control chamber is connected to control nozzle, and through backward-stroke chamber in upper position of the hammer and the above throttle to the working medium source and through the inlet and outlet holes of the spool valve, vacuum ejector and check valve to forward-stroke chamber, which is made in the form of a vacuum spring.

EFFECT: increasing operating efficiency of adjustable impact machine owing to reducing power consumption; improving operation reliability owing to simplifying the design.

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