HYDRAULIC DRIVE FOR, PRIMARILY, MOBILE ANTENNA UNIT WITH HOISTING MAST

摘要

FIELD: transport. ^ SUBSTANCE: invention relates to hoisting device. Hydraulic drive comprises control system, three-position hydraulic control valves, flow rate regulator, and pump unit with tank arranged on vehicle platform. Pump unit is communicated via first hydraulic control vale, pressure and drain lines with rod and piston chambers of hoisting mast hydraulic cylinder. Antenna support platform is articulated with hoisting mast to turn in vertical plane and communicated with turn hydraulic cylinder. In compliance with this invention, hydraulic drive additionally incorporates first and second flow rate limiters. Pressure line communicating pump unit with hoisting hydraulic cylinder may be communicated with piston end of the latter via first flow rate limiter, first hydraulic lock and second flow rate limiter. Note here that first flow rate limiter limits flow rate in mast hoisting while second one limits flow rate in mast lowering. Note also that pump efficiency exceeds sum of flow rates of regulator and limiter. ^ EFFECT: higher reliability and safety. ^ 3 cl, 6 dwg