Plastic article or earthenware shaping or treating: apparatus – Means feeding fluent stock from plural sources to common...
Patent
1995-07-11
1997-07-08
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Means feeding fluent stock from plural sources to common...
264572, 425145, 425146, B29C 4516
Patent
active
056458665
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a pressure control device and/or pressure regulating device for a fluid medium to be fed to an injection mold in addition to the molten plastics, this pressure control device and/or pressure regulating device being provided between a pressure generator and an injection system associated with the injection mold and having a main line which leads from the pressure generator to the injection system and branches into at least two parallel flow paths, each flow path being outfitted with a media inflow control valve which may be operated to let through or block flow, as required, and wherein a first branch line and second branch line branch off from the main line downstream of the junction of the two flow paths, wherein the second branch line can be switched so as to either let through or block flow via a media outflow control valve and in so doing forms a media outflow from the injection mold.
2. Description of the Related Art
A pressure control device and/or pressure regulating device of this type is already known from DE 37 34 164 A1 and EP-03 10 914 A2 and has also proven fundamentally successful in practice. However, shortcomings persist on the one hand in that an exact and precisely reproducible regulation of pressure cannot always be achieved and, on the other hand, regulation does not function equally reliably for both small and large volumes of media per time unit.
In another pressure control device and/or pressure regulating device known from WO 91/14 559 A1, it is possible to achieve an exact and precise reproducible regulation of pressure; however, the relatively high technical cost for constructing this control device and/or regulating device is disadvantageous. Moreover, in the known arrangement the entire pressure monitoring system can be operated only in exclusive dependence on the existing control arrangement (control panel) so that regulation is not equally dependable for both small and large volumes of media per time unit.
Therefore, the object of the present invention is to ensure faultless operation of the pressure control device and/or pressure regulating device regardless of whether the required throughput volume of media per time unit is small or large and to enable simpler storage of data affecting remote control together with other processing parameters on electrical or magnetic data storage media.
SUMMARY OF THE INVENTION
This object is met according to the invention in that the first branch line leads to one side of a pressure sensor whose other side, the receiver side, is sensitive to the pressure of the medium in the injection mold, in that the media outflow control valve in the second branch line is influenced by the pressure sensor, in that the media inflow control valves in the parallel flow paths of the main line have different flow cross sections, and in that these media inflow control valves can be controlled individually and/or jointly in a stepwise manner by means of the final control elements of a closed loop or regulating circuit so as to let through or block flow depending on the difference between the pressure in the first branch line and the pressure in the mold cavity of the injection mold, which pressure difference is detected by the pressure sensor.
The distinctive character of the proposed solution according to the invention lies not only in the fact that the pressure prevailing in the mold cavity of the injection mold can directly influence the switching state of the media outflow control valve, but that, beyond this, it is possible to allow three different volume flows of the fluid medium per time unit to pass through the main line using only two media inflow control valves.
The pressure control device and/or pressure regulating device according to the invention has the advantage that not only seat valves but also other remote-controllable valves, e.g., proportional valves, can be used for the media inflow control valves as well as for the media outflow control valve, provided t
REFERENCES:
patent: 4030523 (1977-06-01), Cram et al.
patent: 4781554 (1988-11-01), Hendry
patent: 5204050 (1993-04-01), Loren
patent: 5362222 (1994-11-01), Faig et al.
patent: 5423667 (1995-06-01), Jaroschek
patent: 5466141 (1995-11-01), Eckardt et al.
Eckardt Helmut
Ehritt Jurgen
Holzschuh Johann
Renger Michael
Schwesinger Rolf
Battlefeld GmbH
Heitbrink Tim
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