Construction machine

摘要

Provided is a construction machine comprising an energy recovery device for recovering hydraulic fluid energy from a hydraulic actuator and being capable of achieving excellent operability even when the power of the prime mover is changed. The construction machine comprises an engine (1), a hydraulic pump (2), a plurality of hydraulic actuators (31 - 34), a plurality of control valves (41 - 44), a plurality of operating devices (71 - 74), an energy recovery device (80), an operation mode selector switch (76), an engine revolution speed dial (77), a pressure sensor (75), and a controller (90) which controls the flow rate of hydraulic fluid recovered by the energy recovery device based on input signals from the operation mode selector switch, the engine revolution speed dial and the pressure sensor.