Double closing unit for an injection moulding machine

Details Double closing unit for an injection moulding machine Double closing unit for an injection moulding machine

1996-01-05

1998-02-03

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means to close mold

425595, B29C 4567

Patent

active

057141800

DESCRIPTION:

BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION

The invention relates to a double closing unit of an injection moulding machine with at least one injection assembly, a stationary mould mounting plate and two movable mould mounting plates which are connected by way of bar members, and with fast-motion cylinders and pressure cushion systems for building up the closing force, wherein the stationary mould mounting plate are arranged between the two movable mould mounting plates.
In conventional injection moulding machines there is only one closing system with a stationary and a movable mould mounting plate. Only one tool can be respectively held in position in an injection moulding machine of that kind. For reasons of economy attempts have been made to design closing systems in which two tools can be mounted, which tools can be filled with plasticised plastic material either simultaneously or alternately.
An injection moulding machine of that kind is described in EP-Al-0 068 596. In the case of that closing unit the stationary mould mounting plate is arranged at the end and there is only one hydraulic system for building up the pressure. That arrangement involves a mutual dependency in respect of the production procedure in the two moulding tools. The distributor system for the plasticised plastic material is disposed at one of the movable mould mounting plates which as a result is of a very large mass. The relationship with the injection unit is interrupted in each movement operation.
French patent specification No 1 304 803 discloses a closing unit with a central stationary mould plate and two movable mould mounting plates which are arranged at the two sides of the stationary mould plate. That arrangement has two further outer end plates against which the hydraulic cylinders which act on the movable mould mounting plates are supported. Consequently a closing unit of that kind has a total of five plates. DE-Al-33 00 652 discloses a closing unit with a central stationary mould mounting plate and two movable mould mounting plates, the two mould mounting plates being moved by way of high-pressure advance means. The high-pressure advance means bears against an additional end plate. That injection moulding machine therefore has a total of four plates and is therefore still relatively expensive.


SUMMARY OF THE INVENTION

The object of the present is to be provide a double closing unit for an injection moulding machine, which is distinguished by being of a particularly economical design configuration.
In accordance with the invention that object is attained in that the closing unit is designed without end plates and there are only the three mould mounting plates and that the pressure cushion systems and/or the fast-motion cylinders are supported at the stationary mould mounting plate.
The configuration according to the invention of the closing unit, wherein the pressure cushion systems or the fast-motion cylinders are supported at the stationary mould mounting plate, means that it is possible to omit a further end plate. The closing unit has only the three mould mounting plates which are absolutely necessary so that two moulding tools can be arranged simultaneously in the injection moulding machine, with a minimum in terms of structural expenditure.
Various embodiments of the invention are described in greater detail hereinafter with reference to the figures of the accompanying drawings.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagrammatic view of an embodiment, wherein one tool is closed and one tool is open,
FIG. 2 is a plan view of that closing unit with the distribution system for the plasticised plastic material and the locking mechanism,
FIG. 3 shows an embodiment with two injection assemblies,
FIG. 4 shows the arrangement of the fast-motion cylinders,
FIG. 5 diagrmmatically shows a view partly in section through a further embodiment of a closing unit according to the invention, one tool being closed and one tool open,
FIG. 6 is a plan view partly in section of the middle mould mounting plate,
FIG. 7 is a pa

REFERENCES:
patent: 5145353 (1992-09-01), Zakich
patent: 5538415 (1996-07-01), Reinhart et al.

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