EP0093187B2 - Screen drum for a pulp stock screening apparatus - Google Patents

Screen drum for a pulp stock screening apparatus Download PDF

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Publication number
EP0093187B2
EP0093187B2 EP82103801A EP82103801A EP0093187B2 EP 0093187 B2 EP0093187 B2 EP 0093187B2 EP 82103801 A EP82103801 A EP 82103801A EP 82103801 A EP82103801 A EP 82103801A EP 0093187 B2 EP0093187 B2 EP 0093187B2
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EP
European Patent Office
Prior art keywords
filter basket
cavities
grooves
wall
filter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP82103801A
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German (de)
French (fr)
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EP0093187B1 (en
EP0093187A1 (en
Inventor
Emil Holz
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Voith Finckh Fiber Systems GmbH and Co KG
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Hermann Finckh Maschinenfabrik GmbH and Co
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8189017&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0093187(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Hermann Finckh Maschinenfabrik GmbH and Co filed Critical Hermann Finckh Maschinenfabrik GmbH and Co
Priority to AT82103801T priority Critical patent/ATE14763T1/en
Priority to DE8282103801T priority patent/DE3265205D1/en
Priority to EP82103801A priority patent/EP0093187B2/en
Priority to CA000426764A priority patent/CA1205044A/en
Priority to US06/488,672 priority patent/US4529519A/en
Priority to JP58076320A priority patent/JPS58202007A/en
Priority to FI831508A priority patent/FI74058B/en
Publication of EP0093187A1 publication Critical patent/EP0093187A1/en
Publication of EP0093187B1 publication Critical patent/EP0093187B1/en
Publication of EP0093187B2 publication Critical patent/EP0093187B2/en
Application granted granted Critical
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/16—Cylinders and plates for screens

Definitions

  • the invention relates to a screen basket for sorters for sorting fiber suspensions, according to the preamble of claim 1.
  • Screen baskets of the type in question can be cylindrical or conical and optionally also be provided with a bottom and / or a lid.
  • a strainer basket of the type mentioned at the beginning with slots running in the axial or circumferential direction is e.g. B. from US-A-3 581 903 of the applicant.
  • Sieve baskets of this type are produced from a sheet metal which is bent and closed to form a circular cylinder and into which the sieve openings have been incorporated in the flat state.
  • the measure to design the sieve openings in such a way that they widen in the forward direction is used because it has been shown that in connection with the cleaning blades or strips of the rotors of the sorters having such a sieve basket there is a risk of blockages which almost completely avoids sieve openings.
  • boat-shaped depressions are first milled out of the sheet in plan view for each of the strainer openings from the later outlet side of the strainer wall, whereupon slots are sawn into the sheet from the same sheet side with a thin circular saw blade, each arranged on the keel of the depressions are.
  • the milling out of the recesses is not only necessary because the sieve openings are to expand in the forward direction for the reason described above, but the pressure difference prevailing in the case of so-called pressure sorters between the inflow and outlet sides of the sieve basket requires a relatively thick sieve basket wall, into which the fine ones required are required Otherwise slots could not be sawn.
  • the milled recesses must also be made with a much greater length than the sieve opening slots, which further increases the weakening of the screen basket wall.
  • the transverse spacing of the sieve opening slots from one another must be chosen to be relatively large, so that the webs remaining between the sieve openings give the sieve basket wall a reasonably sufficient rigidity, a circumstance which predetermines the maximum throughput of fiber suspension through a known sieve basket of the type in question Dimensions reduced.
  • the sieve plates processed in the manner described cannot be bent into an absolutely round strainer basket, because the ring zones not provided with milled recesses and sawn slots for attaching the reinforcement rings do not have the same deformation properties as the areas with sieve openings in between.
  • the invention had for its object to provide a screen basket for sorters for sorting fiber suspensions and in particular for pressure sorters, which has widening in the forward direction and slot-shaped screen openings on the upstream side and whose wall has a greater strength for a given wall thickness even without reinforcement rings or the like than the known strainer baskets of the type described.
  • this object can be achieved by the features of the characterizing part of claim 1.
  • the wells in question can be z. B. particularly easy to produce by milling if they are circular cylindrical.
  • the sheet or other material for the screen basket wall is stretched, i.e. processed flat state before it is formed into the screen basket.
  • the design according to the invention leads to sieve opening slots of different lengths, which is advantageous, among other things, because this results in a sieve basket, the stability of which resembles that of a perforated hole Sieve basket comes close.
  • the screen basket wall can also be bent into an absolutely round screen basket without great difficulty if the depressions form a regular pattern and are, in particular, circular-cylindrical, because then there are no preferred directions of the screen basket wall with regard to the bending rigidity.
  • a sieve basket with a predetermined maximum throughput can be reduced in such a way that the drive energy for the rotor can be reduced by up to 20%, and further energy savings are made possible by eliminating the recesses which have not been milled out Areas of the wall of the known screen baskets the total screen area can be reduced by up to about 23%.
  • FIGS 1 to 3 show a screen basket 10 for a pressure sorter, in which the fiber suspension to be sorted, the screen basket from the outside in, i.e. Flow in the direction of arrow A in Figure 1.
  • the screen basket wall 12 has an upper and a lower ring area 14 and 16 without screen openings for mounting the screen basket in the pressure sorter.
  • the outside of the screen basket wall is provided with circumferential grooves 18 arranged at equal intervals from one another, while circular cylindrical recesses 20 have been milled out of the inside of the screen basket wall, the depth of which is so great that sieve opening slots 22 result in the overlap region of the circumferential grooves 18 and the recesses 20 .
  • the centers of the depressions 20, which have been designated by “C” in FIG. 2 lie at the corners of an equilateral triangle which was indicated by dash-dotted lines in FIG. 2 for three mutually adjacent depressions.
  • the non-perforated areas 24 of the screen basket wall 12 form a network structure between the depressions 20, which gives the screen basket wall 12 the required rigidity.
  • the depth of the recesses 20 and depth “e” of the grooves 18 should be so large that the value (D - d) is approximately 0.8 to 1.2 mm, while «e» is approximately 0.9 to 1.3 mm.
  • FIGS. 1 to 3 shows a sieve basket 10 'which likewise flows through from the outside inwards, with grooves 18' running in the axial direction, so that sieve opening slots 22 'running in the axial direction surrender.
  • the strainer basket 10 'shown in FIG. 5 as a third embodiment is designed for through-flow from the inside out, i.e. provided in the direction of arrow B and it has circumferential grooves 18 "on the inside, while circular cylindrical depressions 20" lie on the outer side of the strainer basket.
  • the screen opening slots also run here in the circumferential direction and were designated 22 ".
  • grooves 18, 18 'and 18 do not necessarily have to run in the circumferential direction or in the direction of the axis of the strainer basket, for example it would easily be possible for the grooves 18' to unite with the vertical form an acute angle.
  • Such a strainer basket according to the invention is characterized by an even greater stability, since the weakening of the strainer basket wall due to the grooves 18 and 18 'present outside the depressions is eliminated.
  • the invention thus created a screen basket in which the sum of the clear openings of the screen basket wall and their stability are greater than in the known screen baskets with slot-like screen openings widening in the direction of passage (given values for the screen basket height and the screen basket diameter), which under Another reason for this is that the screen basket is perforated everywhere outside its assembly areas.

Abstract

Screen cage for pressure sorters, with which, in order to increase the stability of the screen cage wall and the sum total of the inside screen cage apertures, the screen cage wall has a regular pattern of cylindrical recesses on its outlet side and grooves extending parallel to each other on its inflow side, the grooves and the recesses together forming screen aperture slots.

Description

Die Erfindung betrifft einen Siebkorb für Sortierer zum Sortieren von Fasersuspensionen, gemäß dem Oberbegriff des Anspruchs 1. Siebkörbe der in Rede stehenden Art können zylindrisch oder konisch ausgebildet und gegebenenfalls auch mit einem Boden und/oder einem Deckel versehen sein.The invention relates to a screen basket for sorters for sorting fiber suspensions, according to the preamble of claim 1. Screen baskets of the type in question can be cylindrical or conical and optionally also be provided with a bottom and / or a lid.

Ein Siebkorb der eingangs erwähnten Art mit in axialer oder Umfangsrichtung verlaufenden Schlitzen ist z. B. aus der US-A-3 581 903 der Anmelderin bekannt. Derartige Siebkörbe werden aus einem zum Kreiszylinder gebogenen und geschlossenen Blech hergestellt, in das im flachgelegten Zustand die Sieböffnungen eingearbeitet worden sind. Zu der Massnahme, die Sieböffnungen so zu gestalten, daß sie sich in Durchlaßrichtung erweitern, greift man, weil sich gezeigt hat, daß sich auf diese Weise in Verbindung mit den Reinigungsflügeln oder -leisten der Rotoren der einen solchen Siebkorb aufweisenden Sortierer die Gefahr von Verstopfungen der Sieböffnungen nahezu völlig vermeiden lässt.A strainer basket of the type mentioned at the beginning with slots running in the axial or circumferential direction is e.g. B. from US-A-3 581 903 of the applicant. Sieve baskets of this type are produced from a sheet metal which is bent and closed to form a circular cylinder and into which the sieve openings have been incorporated in the flat state. The measure to design the sieve openings in such a way that they widen in the forward direction is used because it has been shown that in connection with the cleaning blades or strips of the rotors of the sorters having such a sieve basket there is a risk of blockages which almost completely avoids sieve openings.

Bei dem bekannten Siebkorb werden zunächst für jede der Sieböffnungen von der späteren Auslaßseite der Siebkorbwand her in der Draufsicht schiffchenförmige Vertiefungen aus dem Blech herausgefräst, worauf von derselben Blechseite her mit einem dünnen Kreissägeblatt Schlitze in das Blech gesägt werden, die jeweils am Kiel der Vertiefungen angeordnet sind. Das Herausfräsen der Vertiefungen ist nicht nur deshalb erforderlich, weil sich die Sieböffnungen aus dem vorstehend geschilderten Grund in Durchlaßrichtung erweitern sollen, sondern die bei sogenannten Drucksortierern zwischen Anström- und Auslaßseite des Siebkorbs herrschende Druckdifferenz macht eine relativ dicke Siebkorbwand erforderlich, in die die benötigten feinen Schlitze sonst nicht eingesägt werden könnten. Die für jede einzelne Sieböffnung aus der Siebkorbwand herausgefrästen Vertiefungen schwächen den Siebkorb jedoch derart, daß in der Praxis Verstärkungsringe erforderlich sind, die in axialem Abstand voneinander auf der Aussenseite der Siebkorbwand angebracht werden, damit diese bei einem Einsatz in Drucksortierern der erwähnten Druckdifferenz standzuhalten vermag. Dadurch werden die bekannten Siebkör. be von Drucksortierern jedoch nicht nur verteuert, sondern die Verstärkungsringe decken einen erheblichen Teil der Siebkorbfläche ab, weshalb man die bekannten Siebkörbe relativ gross bemessen muß. Dies führt wiederum zu einem höheren Energiebedarf des Sortierers, denn die am Sortierer-Rotor vorgesehenen Reinigungsflügel oder -leisten müssen eine grössere Länge aufweisen und/oder pro Umdrehung des Rotors einen längeren Weg durchlaufen, was ersichtlich zu einer Erhöhung der für den Rotor benötigten Antriebsleistung führt.In the known strainer, boat-shaped depressions are first milled out of the sheet in plan view for each of the strainer openings from the later outlet side of the strainer wall, whereupon slots are sawn into the sheet from the same sheet side with a thin circular saw blade, each arranged on the keel of the depressions are. The milling out of the recesses is not only necessary because the sieve openings are to expand in the forward direction for the reason described above, but the pressure difference prevailing in the case of so-called pressure sorters between the inflow and outlet sides of the sieve basket requires a relatively thick sieve basket wall, into which the fine ones required are required Otherwise slots could not be sawn. However, the recesses milled out of the screen basket wall for each individual screen opening weaken the screen basket in such a way that reinforcement rings are required in practice, which are attached at an axial distance from one another on the outside of the screen basket wall so that it can withstand the pressure difference mentioned when used in pressure sorters. As a result, the well-known Siebkör. be not only more expensive from pressure sorters, but the reinforcing rings cover a significant part of the screen basket area, which is why the known screen baskets have to be relatively large. This in turn leads to a higher energy requirement of the sorter, because the cleaning blades or strips provided on the sorter rotor must have a greater length and / or have to travel a longer distance per revolution of the rotor, which obviously leads to an increase in the drive power required for the rotor .

Damit die Sieböffnungsschlitze mit einem Kreissägeblatt hergestellt werden können, müssen die herausgefrästen Vertiefungen ausserdem mit einer weit grösseren Länge als die Sieböffnungsschlitze hergestellt werden, was die Schwächung der Siebkorbwand noch erhöht. Schliesslich müssen die Querabstände der Sieböffnungsschlitze voneinander relativ gross gewählt werden, damit die zwischen den Sieböffnungen stehen bleibenden Stege der Siebkorbwand dieser noch eine einigermassen ausreichende Steifigkeit verleihen, ein Umstand, der den maximalen Durchsatz an Fasersuspension durch einen bekannten Siebkorb der in Rede stehenden Art mit vorgegebenen Abmessungen vermindert. Auch lassen sich die in der geschilderten Weise bearbeiteten Siebbleche nicht zu einem absolut runden Siebkorb biegen, weil die nicht mit herausgefrästen Vertiefungen und gesägten Schlitzen versehenen Ringzoneh zum Anbringen der Verstärkungsringe nicht dieselben Verformungseigenschaften aufweisen wie die dazwischen liegenden, mit Sieböffnungen versehenen Bereiche.So that the sieve opening slots can be made with a circular saw blade, the milled recesses must also be made with a much greater length than the sieve opening slots, which further increases the weakening of the screen basket wall. Finally, the transverse spacing of the sieve opening slots from one another must be chosen to be relatively large, so that the webs remaining between the sieve openings give the sieve basket wall a reasonably sufficient rigidity, a circumstance which predetermines the maximum throughput of fiber suspension through a known sieve basket of the type in question Dimensions reduced. Also, the sieve plates processed in the manner described cannot be bent into an absolutely round strainer basket, because the ring zones not provided with milled recesses and sawn slots for attaching the reinforcement rings do not have the same deformation properties as the areas with sieve openings in between.

Der Erfindung lag die Aufgabe zugrunde, einen Siebkorb für Sortierer zum Sortieren von Fasersuspensionen und insbesondere für Drucksortierer zu schaffen, der sich in Durchlaßrichtung erweiternde und an der Anströmseite schlitzförmig ausgebildete Sieböffnungen aufweist und dessen Wand bei vorgegebener Wanddicke auch ohne Verstärkungsringe oder dergleichen eine grössere Festigkeit aufweist als die bekannten Siebkörbe der geschilderten Art.The invention had for its object to provide a screen basket for sorters for sorting fiber suspensions and in particular for pressure sorters, which has widening in the forward direction and slot-shaped screen openings on the upstream side and whose wall has a greater strength for a given wall thickness even without reinforcement rings or the like than the known strainer baskets of the type described.

Diese Aufgabe lässt sich erfindungsgemäss durch die Merkmale des Kennzeichnens des Anspruchs 1 lösen. Die in Rede stehenden Vertiefungen lassen sich z. B. durch Fräsen besonders einfach herstellen, wenn sie kreiszylindrisch ausgebildet sind. Selbstverständlich wird das Blech oder sonstige Material für die Siebkorbwand im gestreckten, d.h. flachen Zustand bearbeitet, ehe man aus ihm den Siebkorb bildet.According to the invention, this object can be achieved by the features of the characterizing part of claim 1. The wells in question can be z. B. particularly easy to produce by milling if they are circular cylindrical. Of course, the sheet or other material for the screen basket wall is stretched, i.e. processed flat state before it is formed into the screen basket.

Verleiht man den Vertiefungen nicht die Gestalt von Rechtecken mit zu den Sieböffnungsschlitzen parallelen Rändern, so führt die erfindungsgemässe Gestaltung zu Sieböffnungsschlitzen unterschiedlicher Länge, was unter anderem deshalb vorteilhaft ist, weil sich auf diese Weise ein Siebkorb ergibt, dessen Stabilität derjenigen eines mit gebohrten Löchern versehenen Siebkorbs nahe kommt. Auch lässt sich die Siebkorbwand ohne grössere Schwierigkeiten zu einem absolut runden Siebkorb biegen, wenn die Vertiefungen ein regelmässiges Muster bilden und insbesondere kreiszylindrisch ausgebildet sind, weil es dann im Hinblick auf die Biegesteifigkeit keine Vorzugsrichtungen der Siebkorbwand gibt.If the recesses are not given the shape of rectangles with edges parallel to the sieve opening slots, the design according to the invention leads to sieve opening slots of different lengths, which is advantageous, among other things, because this results in a sieve basket, the stability of which resembles that of a perforated hole Sieve basket comes close. The screen basket wall can also be bent into an absolutely round screen basket without great difficulty if the depressions form a regular pattern and are, in particular, circular-cylindrical, because then there are no preferred directions of the screen basket wall with regard to the bending rigidity.

Durch den Wegfall der bisher erforderlichen Verstärkungsringe lässt sich ein Siebkorb vorgegebener maximaler Durchsatzmenge so verkleinern, daß sich die Antriebsenergie für den Rotor um bis zu 20 % verringern lässt, und eine weitere Energieeinsparung wird dadurch ermöglicht, daß wegen des Wegfalls der nicht mit ausgefrästen Vertiefungen versehenen Bereiche der Wand der bekannten Siebkörbe die Gesamtsiebfläche um bis ca. 23 % vermindert werden kann.By eliminating the reinforcement rings previously required, a sieve basket with a predetermined maximum throughput can be reduced in such a way that the drive energy for the rotor can be reduced by up to 20%, and further energy savings are made possible by eliminating the recesses which have not been milled out Areas of the wall of the known screen baskets the total screen area can be reduced by up to about 23%.

Weitere Merkmalen Einzelheiten und Vorteile der Erfindung ergeben sich aus den beigefügten Ansprüchen und/oder aus der nachfolgenden Beschreibung sowie beigefügten zeichnerischen Darstellung bevorzugter Ausführungsformen des erfindungsgemässen Siebkorbs; in der Zeichnung zeigen:

  • Figur 1 Eine Seitenansicht einer teilweise aufgebrochenen ersten Ausführungsform des Siebkorbs;
  • Figur 2 eine vergrösserte Darstellung eines Mantelbereichs des Siebkorbs von aussen gesehen;
  • Figur 3 einen Schnitt nach der Linie 3 - 3 in Figur 2;
  • Figur 4 eine der Figur 1 entsprechende Darstellung einer zweiten Ausführungsform;
  • Figur 5 eine den Figuren 1 und 4 entsprechende Darstellung einer dritten Ausführungsform;
  • Figur 6 eine der Figur 3 entsprechende Darstellung einer vierten Ausführungsform (Ansicht der Auslaßseite eines Teils der Siebkorbwand), und
  • Figur 7 eine Ansicht der Anströmseite eines Teils der Siebkorbswand der vierten Ausführungsform.
Further features Details and advantages of the invention emerge from the appended claims and / or from the following description and the attached drawing of preferred embodiments of the screen basket according to the invention; show in the drawing:
  • Figure 1 is a side view of a partially broken first embodiment of the screen basket;
  • Figure 2 is an enlarged view of a jacket area of the screen basket seen from the outside;
  • 3 shows a section along the line 3 - 3 in Figure 2;
  • Figure 4 is a representation corresponding to Figure 1 of a second embodiment;
  • FIG. 5 shows an illustration corresponding to FIGS. 1 and 4 of a third embodiment;
  • 6 shows a representation corresponding to FIG. 3 of a fourth embodiment (view of the outlet side of a part of the screen basket wall), and
  • Figure 7 is a view of the upstream side of a portion of the screen basket wall of the fourth embodiment.

Die Figuren 1 bis 3 zeigen einen Siebkorb 10 für einen Drucksortier, in dem die zu sortierende Fasersuspension den Siebkorb von aussen nach innen, d.h. in Richtung des Pfeils A in Figur 1 durchströmt. Die Siebkorbwand 12 besitzt einen oberen und einen unteren Ringbereich 14 bzw. 16 ohne Sieböffnungen zur Montage des Siebkorbs im Drucksortierer. Dazwischen ist die Aussenseite der Siebkorbwand mit in gleichen Abständen voneinander angeordneten Umfangsnuten 18 versehen, während von der Innenseite her aus der Siebkorbwand kreiszylindrische Vertiefungen 20 herausgefräst wurden, deren Tiefe so gross ist, daß sich im Überdeckungsbereich der Umfangsnuten 18 und der Vertiefungen 20 Sieböffnungsschlitze 22 ergeben. Bei der bevorzugten Ausführungsform des erfindungsgemässen Siebkorbs liegen die Zentren der Vertiefungen 20, die in Figur 2 mit «C» bezeichnet worden sind, an den Ecken eines gleichseitigen Dreiecks das in Figur 2 für drei einander benachbarte Vertiefungen strichpunktiert angedeutet wurde. Auf diese Weise bilden die nichtdurchbrochenen Bereiche 24 der Siebkorbwand 12 zwischen den Vertiefungen 20 eine Netzstruktur, die der Siebkorbwand 12 die erforderliche Steifigkeit verleiht.Figures 1 to 3 show a screen basket 10 for a pressure sorter, in which the fiber suspension to be sorted, the screen basket from the outside in, i.e. Flow in the direction of arrow A in Figure 1. The screen basket wall 12 has an upper and a lower ring area 14 and 16 without screen openings for mounting the screen basket in the pressure sorter. In between, the outside of the screen basket wall is provided with circumferential grooves 18 arranged at equal intervals from one another, while circular cylindrical recesses 20 have been milled out of the inside of the screen basket wall, the depth of which is so great that sieve opening slots 22 result in the overlap region of the circumferential grooves 18 and the recesses 20 . In the preferred embodiment of the sieve basket according to the invention, the centers of the depressions 20, which have been designated by “C” in FIG. 2, lie at the corners of an equilateral triangle which was indicated by dash-dotted lines in FIG. 2 for three mutually adjacent depressions. In this way, the non-perforated areas 24 of the screen basket wall 12 form a network structure between the depressions 20, which gives the screen basket wall 12 the required rigidity.

Aus Fertigungsgründen empfiehlt es sich, die Tiefe «d» der Vertiefungen 20 und Tiefe «e» der Nuten 18 so zu wählen, daß ihre Summa etwas grösser ist als die ursprüngliche Wandstärke «D» der Siebkorbwand 12, und bei der bevorzugten Ausführungsform soll die Tiefe der Vertiefungen 20 so gross sein, daß der Wert (D - d) ca. 0,8 bis 1,2 mm beträgt, während «e» ca. 0,9 bis 1,3 mm gross bemessen wird. Während die Ausführungsform nach den Figuren 1 bis 3 in Umfangsrichtung verlaufende Sieböffnungsschlitze 22 aufweist, zeigt die Figuren 4 einen gleichfalls von aussen nach innen durchströmten Siebkorb 10' mit in axialer Richtung verlaufenden Nuten 18', so daß sich aus in axialer Richtung verlaufende Sieböffnungsschlitze 22' ergeben.For manufacturing reasons, it is advisable to choose the depth "d" of the recesses 20 and depth "e" of the grooves 18 so that their sum is somewhat larger than the original wall thickness "D" of the screen basket wall 12, and in the preferred embodiment, the The depth of the recesses 20 should be so large that the value (D - d) is approximately 0.8 to 1.2 mm, while «e» is approximately 0.9 to 1.3 mm. While the embodiment according to FIGS. 1 to 3 has sieve opening slots 22 which run in the circumferential direction, FIG. 4 shows a sieve basket 10 'which likewise flows through from the outside inwards, with grooves 18' running in the axial direction, so that sieve opening slots 22 'running in the axial direction surrender.

Der in Figur 5 als dritte Ausführungsform dargestellte Siebkorb 10' ist für eine Durchströmung von innen nach aussen, d.h. in Richtung des Pfeils B vorgesehen und er weist auf der Innenseite Umfangsnuten 18" auf, während kreiszylindrische Vertiefungen 20" auf der Aussensoite des Siebkorbs liegen. Die Sieböffnungsschlitze verlaufen also auch hier in Umfangsrichtung und wurden mit 22" bezeichnet.The strainer basket 10 'shown in FIG. 5 as a third embodiment is designed for through-flow from the inside out, i.e. provided in the direction of arrow B and it has circumferential grooves 18 "on the inside, while circular cylindrical depressions 20" lie on the outer side of the strainer basket. The screen opening slots also run here in the circumferential direction and were designated 22 ".

Es liegt auf der Hand, daß die Nuten 18, 18' und 18" nicht unbedingt in Umfangsrichtung oder in Richtung der Achse des Siebkorbs verlaufen müssen; so wäre es z. B. ohne weiteres möglich, daß die Nuten 18' mit der Vertikalen einen spitzen Winkel bilden.It is obvious that the grooves 18, 18 'and 18 "do not necessarily have to run in the circumferential direction or in the direction of the axis of the strainer basket, for example it would easily be possible for the grooves 18' to unite with the vertical form an acute angle.

Bei einer weiteren Ausführungsform gemäss den Fig. 6 und 7 sind in Umfangsrichtung des Siebkorbs umlaufende oder in Achsrichtung verlaufende Nuten nicht vorhanden, vielmehr wurden nach dem Einbringen von kreiszylindrischen Vertiefungen 203 von der Auslaßseite 13 der Siebkorbwand 123 her mittels eines Lasers oder durch Funkenerosion Sieböffnungsschlitze 223 in die Siebkorbwand geschnitten, die jeweils innerhalb der Vertiefungen 203 enden.In a further embodiment according to FIGS. 6 and 7, there are no circumferential or circumferential grooves in the circumferential direction of the strainer basket; rather, after the introduction of circular cylindrical recesses 20 3 from the outlet side 13 of the strainer basket wall 12 3 by means of a laser or by spark erosion Screen opening slots 22 3 cut into the screen basket wall, each of which ends within the recesses 20 3 .

Ein solcher erfindungsgemässer Siebkorb zeichnet sich durch eine noch grössere Stabilität aus, da die Schwächung der Siebkorbwand durch die außerhalb der Vertiefungen vorhandenen Nuten 18 bzw. 18' entfällt.Such a strainer basket according to the invention is characterized by an even greater stability, since the weakening of the strainer basket wall due to the grooves 18 and 18 'present outside the depressions is eliminated.

Durch die Erfindung wurde also ein Siebkorb geschaffen, bei dem die Summe der lichten Öffnungen der Siebkorbwand sowie deren Stabilität grösser sind als bei den bekannten Siebkörben mit sich in Durchlaßrichtung erweiternden, schlitzförmigen Sieböffnungen (bei vorgegebenen Werten für die Siebkorbhöhe und den Siebkorbdurchmesser), was unter anderem darauf zurückführen ist, daß der Siebkorb ausserhalb seiner Montagebereiche überall perforiert ist.The invention thus created a screen basket in which the sum of the clear openings of the screen basket wall and their stability are greater than in the known screen baskets with slot-like screen openings widening in the direction of passage (given values for the screen basket height and the screen basket diameter), which under Another reason for this is that the screen basket is perforated everywhere outside its assembly areas.

Claims (13)

1. Filter basket (10) for sorters for sorting fibre suspensions, with a filter basket wall (12) bent to form the filter basket and having an inflowside (15) and an outletside (13) and filter openings (22) becoming wider in the direction of filtering and being designed in the form of slits on the inflowside, characterized in that the filter basket wall (12) has non-rectangular cavities (20, 20', 20", 20 3) on the outletside, each of which extends over a plurality-of filter opening slits (22, 22', 22", 22 3) of differing length and which are arranged all-round at distances from one another such that, on the outlet side, the filter basket wall (12) has a reticular structure between the cavities (20, 20', 20", 203).
2. Filter basket according to claim 1, characterised in that the cavities (20, 20', 20", 203) are formed in the shape of circular cylinders.
3. Filter basket according to claim 1 or 2, characterized in that the cavities (20, 20', 20", 203) form a pattern which is regular in all directions.
4. Filter basket according to claims 2 and 3, characterised in that the centres (C) of the cavities (20, 201, 2011, 203) form the corners of equilateral triangles when the filter basket wall (12) is viewed as being laid flat.
5. Filter basket according to one or more of the claims 1 to 4, characterised in that the thickness of the remainder of the filter basket wall (12) at the base of tile cavities (20, 20. 20", 203) is approximately 1 mm, more particularly approximately 0.8 to 1.2 mm.
6. Filter basket according to one or more of the claims 1 to 5, characterised in that, on the inflow side, the filter basket wall (12) has grooves (18) running parallel with respect to one another, which extend over a plurality of cavities (20, 20', 20", 203).
7. Filter basket according to claim 6, characterised in that the grooves (18) run in the peripheral direction of the filter basket (10) and each form a closed annular groove.
8. Filter basket according to claim 6, characterised in that the grooves (18) run at least approximately in the direction of the axis of the filter basket.
9. Filter basket according to daim 8, characterised in that the grooves (18) end at a distance from the end of the filter basket (10).
10. Filter basket according to one or more of the claims 6 to 9, characterised in that the grooves (18) are arranged at equal distances from one another.
11. Filter basket according to one or more of the claims 6 to 9, characterised in that the grooves (18) have a depth of approximately 1 mm, more particularly 0.9 mm to 1.3 mm.
12. Filter basket according to claims 5 and 11, characterised in that the depth of the grooves (18) is slightly greater than the thickness of the remainder of the filter basket wall (12) at the base or the cavities (20. 20', 20", 203)
13. Filter basket according to one or more of the claims 1 to 5, characterised in that the recesses, which are provided on the inflow side of the filter basket wall (12) and which form the filter opening slits (223), end within the region of the respective cavities (203) and are more particularly cut by means of a laser or erosion.
EP82103801A 1982-05-04 1982-05-04 Screen drum for a pulp stock screening apparatus Expired - Lifetime EP0093187B2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
AT82103801T ATE14763T1 (en) 1982-05-04 1982-05-04 SCREEN BASKET FOR SCREEN FOR SCREENING OF FIBER SUSPENSIONS.
DE8282103801T DE3265205D1 (en) 1982-05-04 1982-05-04 Screen drum for a pulp stock screening apparatus
EP82103801A EP0093187B2 (en) 1982-05-04 1982-05-04 Screen drum for a pulp stock screening apparatus
US06/488,672 US4529519A (en) 1982-05-04 1983-04-26 Screen cage for separators for sorting fibre suspensions
CA000426764A CA1205044A (en) 1982-05-04 1983-04-26 Screen cage for separators for sorting fibre suspensions
JP58076320A JPS58202007A (en) 1982-05-04 1983-05-02 Screen cage of separator for separating fiber suspension
FI831508A FI74058B (en) 1982-05-04 1983-05-03 SILKORG FOER SORTERINGSANORDNING FOER FIBERSUSPENSIONER.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82103801A EP0093187B2 (en) 1982-05-04 1982-05-04 Screen drum for a pulp stock screening apparatus

Publications (3)

Publication Number Publication Date
EP0093187A1 EP0093187A1 (en) 1983-11-09
EP0093187B1 EP0093187B1 (en) 1985-08-07
EP0093187B2 true EP0093187B2 (en) 1990-02-28

Family

ID=8189017

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82103801A Expired - Lifetime EP0093187B2 (en) 1982-05-04 1982-05-04 Screen drum for a pulp stock screening apparatus

Country Status (7)

Country Link
US (1) US4529519A (en)
EP (1) EP0093187B2 (en)
JP (1) JPS58202007A (en)
AT (1) ATE14763T1 (en)
CA (1) CA1205044A (en)
DE (1) DE3265205D1 (en)
FI (1) FI74058B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3607457A1 (en) * 1986-03-07 1987-09-10 Voith Gmbh J M SORTING SCREEN
US4795560A (en) * 1987-04-16 1989-01-03 The Black Clawson Company Screen plates
US4901417A (en) * 1987-08-05 1990-02-20 The Black Clawson Company Method of finishing screen plates
JPS6443318A (en) * 1987-08-10 1989-02-15 Arai Tekkosho Kk Multipurpose cylindrical element for filtration or separation
DE3940334A1 (en) * 1989-12-06 1991-06-13 Finckh Maschf SCREEN FOR PRINT SORTING FOR FIBER SUSPENSIONS
US5513757A (en) * 1994-06-02 1996-05-07 Sulzer Papertec Mansfield Inc. Continuous cut slotted screen basket
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WO2003091497A1 (en) * 2002-04-24 2003-11-06 Frejborg Frey A A screen section, screen cylinder, screening device, and method of screening fibrous material
CN200954409Y (en) * 2006-06-27 2007-10-03 香港理工大学 Filter having better performance through reducing block

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Also Published As

Publication number Publication date
DE3265205D1 (en) 1985-09-12
FI74058B (en) 1987-08-31
JPH0246716B2 (en) 1990-10-17
US4529519A (en) 1985-07-16
FI831508L (en) 1983-11-05
EP0093187B1 (en) 1985-08-07
EP0093187A1 (en) 1983-11-09
CA1205044A (en) 1986-05-27
JPS58202007A (en) 1983-11-25
FI831508A0 (en) 1983-05-03
ATE14763T1 (en) 1985-08-15

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