Mold clamping apparatus for injection molding machine

A mold clamping apparatus for an injection molding machine, for closing and opening a mold including a stationary mold and a movable mold and for clamping the mold closed, said mold clamping apparatus comprising:

• a stationary fixedly holding the stationary mold;
• a movable platen fixedly holding the movable and disposed opposite to the stationary platen;
• tie bars for connecting the movable platen to the stationary platen in a manner that the movable platen moves toward and away from the stationary platen;
• an intermediate mount plate disposed behind the movable platen and movable along the tie bars;
• a rear mount plate fixedly disposed behind the intermediate mount plate;
• a toggle mechanism interconnecting the intermediate mount plate and the rear mount plate to move the intermediate mount plate, said toggle mechanism being electrically driven to move the intermediate mount plate forward and back along the tie bars to close and open the mold;
• a mold clamping ram extending between the intermediate mount plate and the movable platen to exert a mold clamping force on the movable platen;
• and
• clamping force applying means for applying an intensified mold clamping force to the molds, said clamping force applying means including:
• a hydraulic cylinder actuator having a cylinder bore formed in the intermediate mount plate;
• a piston section formed on a rear end of the mold clamping ram and fitted in the cylinder bore;
• a pressure intensifier having therein an intensifier pressure chamber communicating with the hydraulic cylinder actuator;
• a pressure applying member fitted in the intensifier pressure chamber to apply pressure to hydraulic fluid in the intensifier pressure chamber;
• and
• a pressure applying member driving means that is electrically driven to axially shift pressure applying member.