HYDRAULIC DRIVE OF SELF-PROPELLED CRANE Russian patent published in 2020 - IPC B66C13/00 

FIELD: transport machine building.

SUBSTANCE: invention relates to hoisting-and-transport machine building and can be used in hydraulic drives of jib self-propelled cranes, including equipped with telescopic booms with hydraulic drive. Hydraulic drive of hoisting crane consists of hydraulic control valve of crane operations, hydraulic cylinder, brake valve, the design of which does not provide impact of accompanying load on control line of valve opening to drain. Safety valve is additionally installed in the line of working fluid supply into the rod cavity of the hydraulic cylinder with possibility of adjustment of its opening pressure. Output of the safety valve can be connected both to the drain line and the liquid supply line to the piston cavity of the hydraulic cylinder.

EFFECT: elimination of non-uniform movement and jerks of hydraulic cylinder rod during its retraction.

1 cl, 4 dwg