Injection molding machine and injection apparatus
AssigneeThe Japan Steel Works, Ltd.
InventorsYutaka Nakagawa, Yusuke Yonehara, Toshio Toyoshima
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Abstract
A configuration of oil hydraulic power unit is simplified. In the oil hydraulic power unit, a port B and a port C are communicated to each other. By this, the hydraulic oil supplied to the port B can also be supplied to the port C even in exclusion of the solenoid valve and the flow-rate control valve, and, as a result, the hydraulic oil supplied to the port C contacts a side surface of the piston, and therefore, a backward pressure can be applied to the side surface of the piston. Thus, according to the oil hydraulic power unit, the backward movement of the piston can be achieved even in the exclusion of the solenoid valve and the flow-rate control valve.
Claims14
An injection molding machine comprising:
- an injection apparatus configured to perform an injection operation for a material;
- and
- a mold clamping apparatus configured to mold the material injected from the injection apparatus,
- wherein the injection apparatus includes:
- a screw;
- a piston connected to the screw;
- and
- an oil hydraulic power unit configured to drive the piston in an axial direction,
- wherein the oil hydraulic power unit includes:
- a first port configured to serve as a supply passage for hydraulic oil at a time of a forward movement of the piston;
- a second port configured to serve as a discharge passage for the hydraulic oil at a time of a forward movement of the piston;
- and
- a third port configured to serve as a discharge passage for the hydraulic oil when the second port is closed by the piston at a time of a forward movement of the piston, and
- the second port and the third port are integrated with each other so that the hydraulic oil is supplied to the second port and is also supplied to the third port when the hydraulic oil is discharged from the first port to enable a backward movement of the piston by the hydraulic oil supplied to the third port at a time of the backward movement of the piston.
An injection apparatus for performing an injection operation for a material,
- wherein the injection apparatus includes:
- a screw;
- a piston connected to the screw;
- and
- an oil hydraulic power unit configured to drive the piston in an axial direction,
- wherein the oil hydraulic power unit includes:
- a first port configured to serve as a supply passage for hydraulic oil at a time of a forward movement of the piston;
- a second port configured to serve as a discharge passage for the hydraulic oil at a time of a forward movement of the piston;
- and
- a third port configured to serve as a discharge passage for the hydraulic oil when the second port is closed by the piston at a time of a forward movement of the piston, and
- the second port and the third port are integrated with each other so that the hydraulic oil is supplied to the second port and is also supplied to the third port when the hydraulic oil is discharged from the first port to enable a backward movement of the piston by the hydraulic oil supplied to the third port at a time of the backward movement of the piston.
Dependencies are inferred from the claim text.