PNEUMATIC HAMMER WITH THROTTLE AIR CONTROL VALVE Russian patent published in 2011 - IPC B25D9/04 B21C37/24 B25D17/06 

FIELD: process engineering.

SUBSTANCE: invention relates to construction and mining machinery intended for crushing rocky ground and frozen ground. Pneumatic hammer comprises circuit chamber, hollow cylinder accommodating striker with central channel dividing cylinder space into idle and work chambers, barrel and tube with throttle valve. Cylinder one face accommodates cover with flange and central through hole. Opposite face of said cylinder accommodates working tool. Cylinder sidewall is provided with discharge channels. Circular static augmentor chamber is arranged between barrel wall and cylinder outer side surface. Wall cylinder has augmentor channel to periodically communicate augmentor chamber with work chamber. Said augmentor channel is shaped over its length equal. Along cylinder generator, to striker length over striker end face edges. Cover is provided with throttle calibrated radial groove to communicate circuit chamber with circular static augmentor chamber. Tube is passed through striker central channel and cover central orifice to communicate circuit chamber with idle chamber via throttle valve. Tube side surfaces and those of cover central through hole form throttle annular channel that makes an inlet of work chamber.

EFFECT: work chamber air pressure variation control.

9 cl, 9 dwg