| 摘要 |
PURPOSE: An injection device of a die-casting machine is provided which can control the injection speed at real time and comprises a hydraulic circuit in a simple constitution. CONSTITUTION: The injection device comprises a cylinder(2) including a piston(5) for injection and a piston(6) for increasing the pressure, a first flowing path(25) for supplying working liquid for driving the piston(5) for injection, a second flowing path(26) for supplying the working liquid for driving the piston(6) for increasing the pressure, a third flowing path(27) for commonly supplying the working liquid into the first and second flowing paths, a hydraulic source(30) and an accumulator(31) for supplying the working liquid having a prescribed pressure into the third flowing path, and a check valve(22) arranged in the first flowing path, a switch valve(23) arranged in the second flowing path and opening at the driving time of the piston for increasing the pressure and a servo valve(28) arranged in the third flowing path and being adjustable to the opening degree of the valve, wherein the piston(5) for injection and the piston(6) for increasing the pressure are controllably driven based on the opening degree of the servo valve.
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