HYDRAULIC DRIVE PROTECTION SYSTEM Russian patent published in 2016 - IPC F15B20/00 

FIELD: machine building.

SUBSTANCE: system is intended for protecting hydraulic drives of machines from unauthorised discharge of working fluid from hydraulic system. System includes hydraulic tank, pump connected by pressure hydraulic line with hydraulic drive through distributor, and locking device including housing with inlet and outlet cavities, inlet, outlet and drain unions with channels and stop. Locking device is equipped with a rod with axial through channel, one end rigidly fixed in the stop. In the axial through channel of the rod there are radial holes, thread and adjustment screw for adjusting actuation threshold of the locking device. Other end of rod is located in the axial channel of plunger with possibility of piston displacement along the rod. System is equipped with check valve installed on the pressure hydraulic line between the pump and a locking device, two shutoff valves and hydraulic lock, the control cavity of which is connected with drain union with the housing channel and through one shut-off valve is connected to the drain hydraulic line, input cavity of hydraulic lock is connected to pressure hydraulic line between the pump and check valve and an outlet cavity of hydraulic lock is connected to drain hydraulic line. Input cavity of the locking device housing is connected to drain hydraulic line through the inlet connection pipe with channel and other shut-off valve.

EFFECT: higher operational efficiency, response time and universality of the locking device.

1 cl, 1 dwg