Operating device for shut-off needles in injection-moulding devices with needle valve nozzles

Abstract

An operating device (10) for shut-off needles in tooling for injection-moulding processes using needle valve nozzles has a displaceable element (20) to which at least two shut-off needles (16) can be fastened and which can be moved, between two guide rails (30) mounted so as to be longitudinally displaceable in a first direction (R1), in a second direction (R2) running perpendicularly to the first direction (R1). Between the displaceable element (20) and the guide rails (30), at least two slide elements (50) have been arranged in grooves (40) which run obliquely with respect to the first direction (R1) and to the second direction (R2), and these convert a movement of the guide rails (30) in the first direction (R1) into a displacement movement of the displaceable element (20) in the second direction (R2). In order to ensure that the structure is flexible and easy to operate, and permits inexpensive subsequent extension and / or changes, the invention provides arrangement, at the guide rails, of at least one further displaceable element (120), and arrangement, between the further displaceable element (120) and the further guide rails (130), of at least two slide elements (150) in grooves (140) running obliquely with respect to the first direction (R1) and to the second direction (R2).

Description

technical field [0001] The invention relates to an actuation device for closing a needle in an injection molding tool with a needle closing nozzle according to the preamble of claim 1 , and to an injection molding tool as claimed in claim 21 . Background technique [0002] Needle-closed nozzles are used in injection molding tools to feed a flowable mass at a predeterminable temperature under high pressure to a separable mold insert. They have closing needles which are usually driven pneumatically or hydraulically and which periodically open and close the casting openings in the mold inserts. For this purpose, the shut-off needles are mounted axially displaceably in the tool-side region of the injection molding tool, while in the nozzle-side region, preferably centrally, the flow channel for the material to be processed is passed through. The flow channel terminates in a nozzle end piece which constitutes the nozzle outlet opening. In the closed position, the lower end of t...

AI Technical Summary

Problems solved by technology

There is also a problem here: each closing needle is fixed on its needle carrier element via the elastic intermediate element, which further increases the installation time and manufacturing cost

Other shut-off needles can only be installed by replacing the entire valve pin plate, which is very costly in terms of construction

Furthermore, the use of this actuator, especially in smaller injection molding tools, is limited due to the high construction height of the actuator due to the placed actuating lever and the additionally required holding plate

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