Injection apparatus

摘要

An injection apparatus includes an actuating cylinder, an accommodating chamber, and a volume changing part capable of changing the volume of the accommodating chamber. The actuating cylinder has an operation chamber and a piston accommodated in the operation chamber, and supplies an incompressible fluid to the injection cylinder by forcing out the incompressible fluid inside the operation chamber with the piston. The accommodating chamber is connected to the operation chamber, and holds at least some of the incompressible fluid that flows out from the operation chamber due to the piston being pushed out. The volume changing part expands the volume of the accommodating chamber, at the latest simultaneously with the start of acceleration of the actuating cylinder, and stops the expansion of the volume when the operating speed of the piston of the actuating cylinder has reached a desired speed.

主权项

1. An injection apparatus which injects a molding material into a mold by operating an injection cylinder, and fills the mold with the molding material, comprising:
an actuating cylinder which has an operation chamber and a piston that is accommodated in the operation chamber and supplies an incompressible fluid to the injection cylinder by forcing out the incompressible fluid inside the operation chamber with the piston; an accommodating chamber which is connected to the operation chamber, and holds at least some of the incompressible fluid that flows out from the operation chamber due to the piston being pushed out; and a volume changing part configured to expand the volume of the accommodating chamber, at a period one of before or simultaneously with a start of an acceleration of the piston of the actuating cylinder, and to stop the expansion of the volume when the operating speed of the piston of the actuating cylinder has reached a desired speed, wherein the accommodating chamber is an operation chamber of a housing cylinder which is separate from the actuating cylinder, the volume changing part includes a piston of the housing cylinder and a drive part which drives the piston, and the drive part expands the volume of the operation chamber of the accommodating chamber by operating the piston, at the latest simultaneously with the start of acceleration of the actuating cylinder.