PRESS HYDRAULIC CONTROL SYSTEM Russian patent published in 2003 - IPC

FIELD: mechanical engineering; units for control of hydraulic presses. SUBSTANCE: proposed hydraulic control system includes power supply source communicated with actuating hydraulic cylinders through hydraulic distributors. Control pump is connected with end cavities of hydraulic distributors of actuating hydraulic cylinders. Programmer mounted on rod of drive is used for change- over of control hydraulic distributors. Working fluid reservoir is made in form of housing with piston which forms rod and piston chambers. Piston of drive of working fluid reservoir is made in form of hydraulic cylinder with four-way two-position distributor connected with control pump and working fluid reservoir by means of pipe lines. Mounted on end face of rod of hydraulic cylinder of working fluid reservoir is valve mounted in spaced relation in piston between seat and stop for drainage of leakage from rod chamber to piston chamber. EFFECT: enhanced reliability. 2 dwg