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    • 5. 发明申请
    • HYDRAULIC DRIVE SYSTEM FOR A PUNCHING APPARATUS
    • WO2020070614A1
    • 2020-04-09
    • PCT/IB2019/058280
    • 2019-09-30
    • SALVAGNINI ITALIA S.P.A.
    • BATTHEU, Claude LucienBATTAGLIA, Ruggero
    • B21D28/00B21D28/24F15B11/16F15B11/02
    • A hydraulic drive system (1) associable with a multi-press punching apparatus (50) for operating in a separate and independent manner a plurality of punching tools (51) along respective operating axes (A), comprises a plurality of hydraulic cylinders (2), each hydraulic cylinder being associated with a respective punching tool (51) and provided with a respective piston (21) defining a thrust chamber (22) and a return chamber (23) inside the hydraulic cylinder (2) and is associated with the corresponding punching tool (51) for moving the latter along the operating axis (A); a first pump (3) of reversible type connected to the thrust chambers (22) and arranged to send oil at a supply pressure (PA) at least in one of said thrust chambers (22) so as to push the respective piston (21) along a working direction and allowing the punching tool (51) associated therewith to interact with the workpiece (100), or to suck oil from at least said thrust chamber (22) to allow the respective piston (21) moving along a return direction and the punching tool (51) disengaging and moving away from the workpiece (100); a plurality of selector valves (4), each selector valve being associated with a respective hydraulic cylinder (2), interposed between the first pump (3) and the thrust chamber (22) and activable in opening to connect the first pump (3) to the thrust chamber (22) so as to operate the hydraulic cylinder (2); a hydraulic accumulator (5) connected to the return chambers (23) and arranged for maintaining in said return chambers (23) oil at a defined preload pressure.