PRESS HYDRAULIC SYSTEM Russian patent published in 1999 - IPC

FIELD: hydraulic drives; hydraulic systems of vulcanizing presses. SUBSTANCE: hydraulic system includes hydraulic compensator with spring-loaded piston, pump and actuating cylinders with two-position hydraulic distributors. System includes also program carriers, program carrier drive whose cavities are connected to two-position hydraulic distributor and three-position hydraulic distributor mounted at pump outlet and connected to hydraulic distributors of actuating cylinders. System is also provided with camshaft and auxiliary shaft with gear wheels thrown into engagement with toothed rack secured on rod of program carrier drive. Program carriers mounted on camshaft are made in form of two flat cams which may shift relative to each other. thus increasing (decreasing) angle of contact of cams with spool valve of distributor. EFFECT: reduced overall dimensions; easy adjustment; saving of working fluid. 1 dwg