PRESS HYDRAULIC DRIVE Russian patent published in 2000 - IPC

FIELD: metal workings; high-capacity continuous-action plants. SUBSTANCE: invention relates to hydraulic drives of forging-and-pressing machines. It can be used in high-speed presses of metal tile making plants. Press hydraulic drive has hydraulic station, press hydraulic cylinder, control hydraulic distributor whose outlets are coupled with spaces of press hydraulic cylinder through pilot-controlled check valve. Nonreturn valve is installed in line connecting pilot-controlled check valve with piston space of press hydraulic cylinder. Moreover, piston space of press hydraulic cylinder is coupled through additional pilot-controlled check valve with hydraulic accumulator and safety valve. Such design makes it possible to use hydraulic drive in high-speed pressure of high-capacity plants owing to increasing operating speed of hydraulic drive using energy of working liquid at press working stroke to increase approach velocity. EFFECT: enlarged operating capabilities. 1 dwg