MULTICRANK PRESS WITH HYDRAULIC OVERLOAD SAFEGUARD Russian patent published in 1998 - IPC

FIELD: mechanical engineering; press forging; two- or four-crank with press slide hydraulic overload safeguard. SUBSTANCE: multicrank press with hydraulic overload safeguard makes it possible to provide adjustment of each hydraulic support for required pressure, irrespective of pressure in other support using hydraulically controlled servovalves when multicrank press is used as multiposition transfer one to protect press dies from breakage. Slide is installed in press guides inside which, in each point of connection of drive with slide, hydraulic supports are fitted with connected hydraulically controlled safety servovalves. Pumps are provided which are installed for independent control of pressure of liquid delivered into each hydraulic support. At least two disconnecting valves with stepped pistons are installed in main line connecting servovalves. main line from of each hydraulic support is connected with space above larger piston of one disconnecting valve and with space under smaller piston of other disconnecting valve. EFFECT: enlarged operating capabilities. 1 cl, 2 dwg