Heavy tower crane adopting load-sensitive energy-saving hydraulic system

The invention discloses a heavy tower crane adopting a load-sensitive energy-saving hydraulic system. The heavy tower crane comprises a main arm, a weight arm support, a balancing weight, a tower armsupport, a variable-amplitude trolley, a tower crane swing mechanism, a variable-amplitude trolley swing mechanism and a lifting winch. The tower crane swing mechanism is driven by a hydraulic motor II, the variable-amplitude trolley swing mechanism is driven by a hydraulic motor III, the lifting winch is driven by a hydraulic motor I, and full-hydraulic driving is achieved; all the hydraulic motors are connected in a hydraulic system, a hydraulic power pack of the hydraulic system is adopted as the balance weight, the hydraulic power pack and the balancing weight are mounted at the tail end of the weight arm support, the hydraulic power pack achieves the function of the balance weight, and the use number of the balancing weight can be reduced. According to the scheme, a full-hydraulic transmission and control man