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.

主权项

1. A construction machine comprising:
a prime mover; a hydraulic pump which is driven by the prime mover; a plurality of hydraulic actuators which are driven by hydraulic fluid supplied from the hydraulic pump; a plurality of control valves which control flow rates of the hydraulic fluid supplied to the hydraulic actuators; a plurality of operating devices for operating the control valves; an energy recovery device including a regeneration hydraulic motor which is driven by return hydraulic fluid from a particular hydraulic actuator among the plurality of hydraulic actuators; a power adjustment device which adjusts the power of the prime mover to a value specified by an operator; an operation amount detection device which detects the operation amount of a particular operating device corresponding to the particular hydraulic actuator; and a control unit which controls the flow rate of the hydraulic fluid recovered by the regeneration hydraulic motor based on input signals from the power adjustment device and the operation amount detection device.