DIE-CASTING MACHINE WITH ENERGY SAVING EVALUATION SYSTEM
A hydraulic die-casting machine with electric motor actuated by an inverter, provides an energy saving evaluation system with respect to a die-casting machine without inverter.
1 . A die-casting machine with inverter, comprising:
an injection assembly provided with an injection piston for pressurizing cast metal poured into a die and a hydraulic circuit for actuating the injection piston;
a hydraulic pump for feeding the hydraulic circuit through a delivery line;
an electric motor for actuating the hydraulic pump and an inverter for actuating the electric motor;
an evaluation system of the energy savings with respect to a die-casting machine without inverter, comprising:
a) a delivery pressure sensor to detect the pump delivery pressure over a time interval;
b) a consumption detection device for detecting the real energy consumption of the inverter for the time interval;
c) a storage device wherein the data relating to the power absorbed by an electric motor without inverter for a delivery pressure are stored;
d) a processing device to obtain the delivery pressure from the delivery pressure sensor and the absorbed power of a predefined electric motor without an inverter for the predefined delivery pressure from the storage device to calculate an estimated energy consumption over the time interval; and
e) a display device for the representation of data acquired by the processing device.
2 . The die-casting machine according to claim 1 , wherein the processing device calculate a real energy consumption of the machine with inverter and estimated power consumption of the machine without inverter for an entire processing cycle and/or at least one step of the cycle and/or at least one sub-step of the at least one step.
3 . The die-casting machine according to claim 1 , comprising a closing assembly for opening and closing the die-halves forming the die, the closing assembly being hydraulically actuated by the pump.
4 . The die-casting machine according to claim 2 , comprising a closing assembly for opening and closing the die-halves forming the die, actuated hydraulically by means of an additional hydraulic pump actuated by the electric motor.
5 . The die-casting machine according to claim 2 , comprising
a closing assembly for opening and closing the die-halves constituting the die, which is hydraulically actuated by an additional hydraulic pump actuated by an additional electric motor actuated by an additional inverter;
wherein an additional delivery pressure sensor detects the pressure at the delivery of the additional pump;
wherein an additional consumption detection device detect the real energy consumption of the additional inverter; and
wherein the processing device acquire the delivery pressure from the additional delivery pressure sensor, the absorbed power of a predefined additional electric motor without an inverter for the predetermined delivery pressure from the storage device and calculate an additional estimated energy consumption over the time interval.