Konecranes builds first hybrid reachstacker
Reachstacker could allow energy savings of up to 30% with regeneration
Konecranes has introduced what it says is the world's first hybrid reach stacker, the 45 tonne capacity SMV 4531 TB5 HLT for container handling. It is powered by a hybrid diesel/electric driveline, with super capacitor based energy storage.
The company says that fuel savings of up to 30% are possible when compared to a conventional diesel reach stacker, with the conservation of the energy normally wasted through braking and heat loss.
The hybrid reach stacker's is a serial configured diesel/electric system consisting of a diesel engine, an electrical generator and an electrical traction motor. The diesel engine runs at constant RPM for optimum fuel efficiency and powers the generator. Propulsion is provided by an electric motor, and the motor also generates electrical energy when braking, minimising the need for mechanical braking and saving energy.
The hydraulic pumps are electrically driven and electronically controlled, and the return flow from the hydraulic cylinders is not converted into heat, but fed backwards through the pumps which now act as hydraulic motors, thus regenerating electrical energy.
Ultimately, the diesel engine could be eliminated altogether if a direct source of electricity was available, such as fuel cells or an energy storage that can be recharged via a connection to the power grid.