US 4,484,878 AGranted

Filling level monitoring device

AssigneeHermann Berstorff Maschinenbau GmbH

InventorsDietmar Anders, Jurgen Voigt, Heinrich Kruse

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Abstract

A device for monitoring the filling level of the degassing space in an extruder used for processing thermoplastic materials comprises a level detection orifice located in the degassing dome or jacket of the extruder which opening is connected to a conduit. The conduit leads through a regulator device to a gas source. Connected to the conduit, between the regulator device and the orifice, is a pressure sensor such as a pressure difference switch. If the level of molten material in the dome rises above a preselected level, it blocks the opening and produces a back-pressure in the conduit. The switch is automatically actuated by this back-pressure and produces a signal. Appropriate action can then be taken to prevent the further rise of the molten material in the dome and to prevent blockage of the degassing device.

Claims6

Dependent claims

In an extruding device for processing thermoplastic materials or rubber in which a degassing zone is provided for discharging gas from the material being treated, the improvements comprising:

(a) a degassing dome from which gas is removed from the material, and means communicating with said dome for reducing the pressure in said dome thereby to induce the discharge of said gas,
(b) means defining a level detection orifice in said dome,
(c) conduit means in flow communication with said orifice,
(d) regulator means in flow communication with said conduit means,
(e) means for supplying gas to said conduit means through said regulator means, said regulator means controlling the pressure of the gas, and
(f) pressure detector means in flow communication with said conduit means for detecting the pressure therein,
whereby an increase in pressure in said conduit means due to blockage of said orifice actuates said pressure detector means to signal undesirable material buildup in said dome.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/551,921Filed 15 Nov 1983
Priority: DE 324223915 Nov 1982
Granted: 27 Nov 1984
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

G01F 23/16
By measurement of pressure: indicating, recording, or alarm devices being actuated by mechanical or fluid means, e.g. using gas, mercury, or a…
B29C 48/92
Component parts, details or accessories; Auxiliary operations: measuring, controlling or regulating
B29C 48/03
Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor:…
B29C 2948/92019
Measured parameter: pressure