DD267149A3

DD267149A3 - SIEVE FOR PRIVACY CENTERS

Info

Publication number: DD267149A3
Application number: DD29783686A
Authority: DD
Inventors: Harald Zielke; Dietrich Wiegner
Original assignee: Stassfurt Veb Chemieanlagenbau
Priority date: 1986-12-18
Filing date: 1986-12-18
Publication date: 1989-04-26

Abstract

Die Erfindung betrifft ein Sieb fuer Prallsiebzentrifugen zur Entfernung des Oberflaechenwassers von beschleunigten Plastgranulat. Der Erfindung liegt die Aufgabe zugrunde, ein Sieb fuer Prallsiebzentrifugen zu entwickeln, das durch seine Ausfuehrung ein Zusetzen der offenen Siebflaechen ausschliesst. Des weiteren ist eine hoehere Durchsatzmenge zwischen zwei Reinigungszyklen der Prallsiebzentrifugen anzustreben. Es wird die Aufgabe dadurch geloest, dass an der Knickstelle (3) eines Siebes (1) eine Aussparung (5) eingearbeitet ist, die im rechten Winkel zu den Oeffnungen (4) angeordnet ist und aus einer - senkrechten Flaeche - (6) und einer - parallelen Flaeche (7) zur Siebebene (8) besteht und dass die Oeffnungen (4) mit der Aussparung (5) in Wirkverbindung stehen. Fig. 1The invention relates to a screen for impact screen centrifuges for removing the surface water of accelerated plastic granules. The invention has for its object to develop a sieve for impact screening centrifuges, which excludes a clogging of the open Siebflaechen by its execution. Furthermore, a higher throughput between two cleaning cycles of the impact screen centrifuges is desirable. The object is achieved in that at the kink (3) of a screen (1) has a recess (5) is incorporated, which is arranged at right angles to the openings (4) and from a - vertical surface - (6) and a - parallel surface (7) to the screen plane (8) and that the openings (4) with the recess (5) are in operative connection. Fig. 1

Description

Ausführungsbeispielembodiment

Die Erfindung wird nachstehend anhand der beiliegenden Zeichnungen mitThe invention will be described below with reference to the accompanying drawings

Fig. 1: Draufsicht des Siebes Fig. 2: Seitenansicht des Siebes Fig.3: Schnitt durch das SiebFig. 1: Top view of the screen Fig. 2: Side view of the screen Fig.3: section through the sieve

erläutert.explained.

Das in Figur 1 bis Figur 3 gezeigte Ausführungsbeispiel eines Siebes 1 für Prallsiebzentrifugen umfaßt— parallel angeordnete Profilstäbe — 2, die an ihrem Ende eine Knickstelle 3 aufweisen, zwischen denen — parallel- bzw. leicht konisch verlaufende Öffnungen—4 angeordnet sind. An der Knickstelle 3 befindet sich eine Aussparung 5, die im rechten Winkel zu den Öffnungen 4 eingearbeitet ist und aus einer—senkrechten Fläche — 6 und einer — parallelen Fläche — 7 zur Siebebene 8 besteht.The embodiment shown in Figure 1 to Figure 3 of a screen 1 for impact screening centrifuges comprises parallel arranged profile bars - 2, which have at their end a kink 3, between which - parallel or slightly tapered openings-4 are arranged. At the kink point 3 is a recess 5 which is incorporated at right angles to the openings 4 and from a vertical surface - 6 and a - parallel surface - 7 to the sieve level 8 is.

Die — parallel- bzw. leicht konisch verlaufenden Öffnungen—4 stehen mit der Aussparung 5 in Wirkverbindung.The - parallel or slightly tapered openings-4 are connected to the recess 5 in operative connection.

Die Funktion des erfindungsgemäßen Siebes für Prallsiebzentrifugen besteht darin, daß das Sieb 1 so in die Zentrifuge eingebaut wird, daß die—parallel- bzw. leicht konisch verlaufenden Öffnungen—4 in Richtung des Plastgranulatstromes angeordnet sind und die Knickstelle 3 am Ende in Richtung des Plastgranulatstromes sich befindet. Beim Auftreffen des beschleunigten Plastgranulates auf die Siebebene 8 werden Plastgranulatteilchen, die in ihrer Größe im Bereich der — parallel- bzw. leicht konisch verlaufenden Öffnungen — 4 liegen und zu Verstopfungen der o. g. Öffnungen 4 führen, durch nachfolgendes Plastgranulat in Richtung der Knickstelle 3 zur Aussparung 5 getrieben.The function of the sieve according to the invention for impact screening centrifuges is that the sieve 1 is installed in the centrifuge, that the-parallel- or slightly tapered openings-4 are arranged in the direction of Plastgranulatstromes and the kink 3 at the end in the direction of Plastgranulatstromes located. Upon impact of the accelerated plastic granules on the screening level 8 Plastgranulatteilchen that are in size in the region of - parallel or slightly tapered openings - 4 and blockages of o. G. Openings 4 lead, driven by subsequent plastic granules in the direction of the kink 3 to the recess 5.

Die Aussparung 5 wirkt als eine Auswurföffnung für die Plastgranulatteilchen, die in den — parallel- bzw. leicht konisch verlaufenden Öffnungen — 4 sich befinden.The recess 5 acts as an ejection opening for the plastic granulate particles, which are located in the - parallel or slightly tapered openings - 4.

Claims

Screen for impact screening centrifuges for removing the surface water of accelerated plastic granules, consisting of - parallel profile bars - (2) having at their end a kink (3), between which - parallel or slightly tapered openings - (4) are arranged , characterized in that at the kink (3) of a screen (1) has a recess (5) is incorporated, which is arranged at right angles to the openings (4) and from a vertical surface - (6) and a parallel surface - (7) to the screen plane (8), and that the opening (4) with the recess (5) is in operative connection.

For this

2 pages drawings

Field of application of the invention

The invention relates to a screen for impact screening centrifuges for removing the surface water of accelerated Plastgranuiat and ensures that no granules can settle in the screen openings.

Characteristic of the known technical solutions

The prior art has as sieves for impact screen centrifuges in general flat screens, the perforation is formed in a slot or hole shape. The sieves have the task of freeing an accelerated granules of its surface water, and are adapted in their execution of the granules. This sieve openings are sought, which are designed so that they can not be clogged with granules. This desired goal is not achieved satisfactorily in practice.

According to the patent WO 82/02345 a sieve with V-shaped openings is known, the cross sections of an upper narrow parallel inlet and a downwardly V-shaped extended outlet and which is installed perpendicular to the product flow in the centrifuge. This solution has the disadvantage that Granulatteile, which are in size in the region of the inlet cross-section, can accumulate, and for wipers or scrapers are used to remove the granule fixed parts.

The disadvantage of this solution is that these wipers or scrapers can not be used in centrifuges, so that the granules fixed in the upper parallel part of the opening can not be removed by the use of wipers or scrapers.

According to US Pat. No. 3,716,144, screens with parallel openings and their manufacture are known. The webs of the sieves are mutually parallel and arranged transversely to the product flow. The disadvantage of this solution is due to the fact that there is no discharge possibility for granulate particles clamped between the webs and the parallel cross section of the openings promotes settling thereof.

Object of the invention

The aim of the invention is to develop a screen for impact screen centrifuges for removing the surface water from accelerated plastic granules, which excludes clogging of the open screen surface by its execution. Furthermore, a higher throughput of dry granules between two cleaning cycles of the impact screen centrifuges is desirable.

Explanation of the essence of the invention

The invention has for its object to develop a sieve for impact screening centrifuges for removing the surface water of accelerated plastic granules, which excludes by its execution clogging of the open screen surface. At the same time, a higher throughput between two cleaning cycles of the impact screen centrifuge is achieved. According to the invention the object is achieved in that at a kink of a sieve a recess which is incorporated at right angles to the openings, is formed from a vertical surface to the plane and a parallel plane to the plane Siebe, is arranged by the openings with the recess is in Wirkverbindun. The function of the inventive solution is characterized in that the sieve is installed in the centrifuge so that the parallel or slightly tapered openings are arranged in the direction of Plastgranulatstromes and the kink is at the end in the direction of Plastgranulatstromes itself. Upon impact of the accelerated plastic granules on the sieve level are Plastgranulatteilchen that lie in their size in the region of the parallel or slightly tapered openings and blockages of the o.g. Run openings, driven by subsequent plastic granules in the direction of the kink to the recess and ejected.