System for the remote actuation of articulated mechanisms

A system for the remote actuation of articulated mechanisms, said system comprising:

• at least one actuated group comprising:
• a mechanical joint having at least one degree of freedom;
• at least one receiving hydraulic cylinder connected to said mechanical joint;
• a hydraulic transmission comprising, for each actuated group, a first hydraulic line and a second hydraulic line arranged to actuate said or each receiving hydraulic cylinder in order to generate a mechanical action on said mechanical joint proportional to a pressure difference ΔP=P1−P2, where P1 is the fluid pressure in said first hydraulic line and P2 is the fluid pressure in said second hydraulic line;
• an actuation unit comprising at least one actuation group configured for being connected to a respective actuated group by said first hydraulic line and said second hydraulic line, said or each actuation group comprising at least one transmission hydraulic cylinder (150,150′,150″) arranged to vary said pressure difference ΔP present between said first hydraulic line and said second hydraulic line;
• said or each actuation group comprising a first actuator arranged to actuate said or each transmission hydraulic cylinder in order to generate a pressure difference ΔP=ΔPL,
• wherein said or each actuation group also comprises a second actuator arranged to actuate said or each transmission hydraulic cylinder in order to generate a pressure difference ΔP=ΔPH>5*ΔPL.