Injection molding machine, hydraulic actuating mechanism of injection molding machine, and control method therefor
AssigneeMitsubishi Heavy Industries, Ltd.
InventorKoji Kubota
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Abstract
The present invention provides a hydraulic actuating mechanism of an injection molding machine, in which a plurality of hydraulic actuators are driven by one hydraulic pump, wherein the hydraulic pump of the hydraulic actuating mechanism is a variable discharge pump having the maximum necessary delivery capacity at least for each of the hydraulic actuators at the time of the highest rotational speed of the pump; the discharged fluid pressure is controlled by a discharge cutoff function of a pressure compensator ancillary to the variable discharge pump; and the pump is driven by a motor whose rotation can be controlled in a stepless mode.
Claims13
An injection molding machine, comprising:
- electrically-driven die opening/closing means;
- and
- a hydraulic actuating mechanism including:
- a plurality of hydraulic actuators driven by one hydraulic pump, the hydraulic pump of said hydraulic actuating mechanism being a variable discharge pump configured to deliver a maximum necessary delivery capacity at least for each of said hydraulic actuators at the time of a highest rotational speed of said pump;
- and
- a plurality of four-way switching valves and at least one two-way switching valve provided between the variable discharge pump and said plurality of hydraulic actuators, the plurality of four-way switching valves and the at least one two-way switching valve being configured to control an operation of the plurality of hydraulic actuators,
- wherein the plurality of hydraulic actuators includes hydraulically-driven die clamping means, a discharged fluid pressure is controlled by a discharge cutoff function of a pressure compensator ancillary to said variable discharge pump, and said pump is driven by a motor whose rotation can be controlled in a stepless mode.
An injection molding machine including a hydraulic actuating mechanism, the injection molding machine comprising:
- an electrically-driven injector;
- a plurality of hydraulic actuators driven by one hydraulic pump, the hydraulic pump of said hydraulic actuating mechanism being a variable discharge pump configured to deliver a maximum necessary delivery capacity at least for each of said hydraulic actuators at the time of a highest rotational speed of said pump;
- and
- a plurality of four-way switching valves and at least one two-way switching valve provided between the variable discharge pump and said plurality of hydraulic actuators, the plurality of four-way switching valves and the at least one two-way switching valve being configured to control an operation of the plurality of hydraulic actuators,
- wherein the plurality of hydraulic actuators includes a hydraulically-driven die clamp, a discharged fluid pressure is controlled by a discharge cutoff function of a pressure compensator ancillary to said variable discharge pump, and said pump is driven by a motor whose rotation can be controlled in a stepless mode.
Dependencies are inferred from the claim text.