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EP0093187A1 - 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
EP0093187A1
EP0093187A1 EP82103801A EP82103801A EP0093187A1 EP 0093187 A1 EP0093187 A1 EP 0093187A1 EP 82103801 A EP82103801 A EP 82103801A EP 82103801 A EP82103801 A EP 82103801A EP 0093187 A1 EP0093187 A1 EP 0093187A1
Authority
EP
European Patent Office
Prior art keywords
sieve
screen basket
screen
basket
wall
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.)
Granted
Application number
EP82103801A
Other languages
German (de)
French (fr)
Other versions
EP0093187B2 (en
EP0093187B1 (en
Inventor
Emil Holz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Finckh Fiber Systems GmbH and Co KG
Original Assignee
Hermann Finckh Maschinenfabrik GmbH and Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
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(A1) "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 EP82103801A priority Critical patent/EP0093187B2/en
Priority to AT82103801T priority patent/ATE14763T1/en
Priority to DE8282103801T priority patent/DE3265205D1/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
Application granted granted Critical
Publication of EP0093187B2 publication Critical patent/EP0093187B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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, with an inflow and an outlet side and with sieve openings widening in the forward direction, which are slot-shaped on the inflow side.
  • Sieve baskets of the type in question can be cylindrical or conical and can also be provided with a base and / or a lid.
  • a screen basket of the type mentioned / with slots running in the axial or circumferential direction is known, for example, from US Pat. No. 3,581,903 by 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.
  • 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.
  • the known screen baskets of pressure sorters are not only more expensive, but the reinforcement rings cover a considerable part of the screen basket area, which is why the known screen baskets have to be relatively large.
  • 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 still give the sieve basket wall a reasonably sufficient rigidity, a fact which predetermines the maximum throughput of fiber suspension through a known sieve basket of the type in question Dimensions reduced.
  • the screen plates processed in the manner described cannot be bent into an absolutely round screen 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 screen openings located 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 according to the invention in that the screen basket wall is provided with recesses on the outlet side, each of which extends over a plurality of screen opening slots and which are arranged on all sides at such intervals that the screen basket wall has a network structure on the outlet side between the recesses.
  • the depressions in question can be produced particularly easily, for example by milling, if they are circular-cylindrical.
  • the sheet or other material for the screen basket wall is processed in the stretched, ie flat state, before the screen basket is formed from it.
  • the design according to the invention leads to sieve opening slits of different lengths, which is advantageous, among other things, because in this way a sieve basket is obtained, the stability of which is that of a one with drilled holes provided 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 “C” in FIG. 2 lie at the corners of an equilateral triangle, which was indicated by dash-dot 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 large enough that the value (D - d) is approximately 0.8 to 1.2 mm, while "e” is approximately 0.9 to 1.3 mm.
  • FIG. 4 shows a sieve basket 10 'which also flows through from the outside inwards, with grooves 18' running in the axial direction, so that sieve opening slots 22 'also running in the axial direction. surrender.
  • the strainer basket 10 "shown in FIG. 5 as a third embodiment is intended for through-flow from the inside to the outside, ie in the direction of the arrow B and has circumferential grooves 18" on the inside, while circular cylindrical depressions 20 "lie on the outside 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 screen basket; it would, for example, be readily possible for the grooves 18' to form an acute angle with the vertical .
  • 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 or 18 'or 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 is that the screen basket is perforated everywhere outside of its assembly areas.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Filtering Materials (AREA)
  • Filtration Of Liquid (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

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, mit einer Anström- und einer Auslaßseite und mit sich in Durchlaßrichtung erweiternden Sieböffnungen, die an der Anströmseite schlitzförmig ausgebildet sind. 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, with an inflow and an outlet side and with sieve openings widening in the forward direction, which are slot-shaped on the inflow side. Sieve baskets of the type in question can be cylindrical or conical and can also be provided with a base and / or a lid.

Ein Siebkorb der eingangs/erwähnten Art mit in axialer oder Umfangsrichtung verlaufenden Schlitzen ist z.B. aus der US-PS 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 screen basket of the type mentioned / with slots running in the axial or circumferential direction is known, for example, from US Pat. No. 3,581,903 by 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 Siebkörbe 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. 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 Ringzonen zum Anbringen der Verstärkungsringe nicht dieselben Verformungseigenschaften aufweisen wie die dazwischen liegenden, mit Sieböffnungen versehenen Bereiche.In the known screen basket, for each of the screen openings from the later outlet side of the screen basket wall, boat-shaped depressions are milled out of the sheet in plan view, whereupon slots are sawn into the sheet from the same sheet side with a thin circular saw blade, each on the "keel" of the Wells are arranged. The milling out of the depressions is not only necessary because the sieve openings should widen 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 necessitates a relatively thick sieve basket wall into which the required ones are required fine slots could not be sawn otherwise. 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 known screen baskets of pressure sorters are not only more expensive, but the reinforcement rings cover a considerable 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 those required for the rotor. Drive power leads. 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 still give the sieve basket wall a reasonably sufficient rigidity, a fact which predetermines the maximum throughput of fiber suspension through a known sieve basket of the type in question Dimensions reduced. Also, the screen plates processed in the manner described cannot be bent into an absolutely round screen 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 screen openings located 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. Diese Aufgabe lässt sich erfindungsgemäss dadurch lösen, daß man die Siebkorbwand an der Auslaßseite mit Vertiefungen versieht, deren jede sich über mehrere Sieböffnungsschlitze erstreckt und die allseitig in solchen Abständen voneinander angeordnet sind, daß die Siebkorbwand auf der Auslaßseite zwischen den Vertiefungen eine Netzstruktur aufweist. 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.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 according to the invention in that the screen basket wall is provided with recesses on the outlet side, each of which extends over a plurality of screen opening slots and which are arranged on all sides at such intervals that the screen basket wall has a network structure on the outlet side between the recesses. The depressions in question can be produced particularly easily, for example by milling, if they are circular-cylindrical. Of course, the sheet or other material for the screen basket wall is processed in the stretched, ie flat state, before the screen basket is formed from it.

Verleiht man den Vertiefungen nicht gerade 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 slits, the design according to the invention leads to sieve opening slits of different lengths, which is advantageous, among other things, because in this way a sieve basket is obtained, the stability of which is that of a one with drilled holes provided 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 previously required reinforcement rings, 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 Merkmale, Einzelheiten und Vorteile der Erfindung ergeben sich aus den beigefügten Ansprüchen und/oder aus der nachfolgenden Beschreibung sowie der beigefügten zeichnerischen Darstellung bevorzugter Ausführungsformen des erfindungsgemässen Siebkorbs; in der Zeichnung zeigen:

  • Fig. 1 Eine Seitenansicht einer teilweise aufgebrochenen ersten Ausführungsform des Siebkorbs;
  • Fig. 2 eine vergrösserte Darstellung eines Mantelbereichs des Siebkorbs von aussen gesehen;
  • Fig. 3 einen Schnitt nach der Linie 3-3 in Figur 2;
  • Fig. 4 eine der Figur 1 entsprechende Darstellung einer zweiten Ausführungsform;
  • Fig. 5 eine den Figuren 1 und 4 entsprechende Darstellung einer dritten Ausführungsform;
  • Fig. 6 eine der Fig. 3 entsprechende Darstellung einer vierten Ausführungsform (Ansicht der Auslaßseite eines Teils der Siebkorbwand), und
  • Fig. 7 eine Ansicht der Anströmseite eines Teils der Siebkorbwand der vierten Ausführungsform.
Further features, details and advantages of the invention result 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:
  • Fig. 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.
  • 4 shows a representation corresponding to FIG. 1 of a second embodiment;
  • 5 shows a representation corresponding to FIGS. 1 and 4 of a third embodiment;
  • Fig. 6 is a representation corresponding to FIG. 3 of a fourth embodiment (view of the outlet side of a part of the screen basket wall), and
  • Fig. 7 is a view of the upstream side of a part of the screen basket wall of the fourth embodiment.

Die Figuren 1 bis 3 zeigen einen Siebkorb 10 für einen Drucksortierer, 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 Siebkorwand 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 “C” in FIG. 2, lie at the corners of an equilateral triangle, which was indicated by dash-dot 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 Summe 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.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 slightly 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 large enough that the value (D - d) is approximately 0.8 to 1.2 mm, while "e" is approximately 0.9 to 1.3 mm.

Während die Ausführungsform nach den Figuren 1 bis 3 in Umfangsrichtung verlaufende Sieböffnungsschlitze 22 aufweist, zeigt die Figur 4 einen gleichfalls von aussen nach innen durchströmten Siebkorb 10' mit in axialer Richtung verlaufenden Nuten 18', so daß sich auch in axialer Richtung verlaufende Sieböffnungsschlitze 22' ergeben.While the embodiment according to FIGS. 1 to 3 has sieve opening slots 22 running in the circumferential direction, FIG. 4 shows a sieve basket 10 'which also flows through from the outside inwards, with grooves 18' running in the axial direction, so that sieve opening slots 22 'also 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 Aussenseite 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 intended for through-flow from the inside to the outside, ie in the direction of the arrow B and has circumferential grooves 18" on the inside, while circular cylindrical depressions 20 "lie on the outside 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 screen basket; it would, for example, be readily possible for the grooves 18' to form an acute angle with the vertical .

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 screen basket, but rather, after the introduction of circular cylindrical recesses 20 3 from the outlet side 13 of the screen 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' 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 or 18 'or 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 zurückzuführen 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 is that the screen basket is perforated everywhere outside of its assembly areas.

Claims (13)

1. Siebkorb für Sortierer zum Sortieren von Fasersuspensionen, mit einer Anström- und einer Auslaßseite und mit sich in Durchlaßrichtung erweiternden Sieböffnungen, die an der Anströmseite schlitzförmig ausgebildet sind, dadurch gekennzeichnet, daß die Siebkorbwand an der Auslaßseite Vertiefungen aufweist, deren jede sich über mehrere Sieböffnungsschlitze erstreckt und die allseitig in solchen Abständen voneinander angeordnet sind, daß die Siebkorbwand auf der Auslaßseite zwischen den Vertiefungen eine Netzstruktur aufweist.1. Sieve basket for sorters for sorting fiber suspensions, with an inflow and an outlet side and with widening in the forward direction sieve openings, which are slit-shaped on the inflow side, characterized in that the sieve basket wall has depressions on the outlet side, each of which has several Sieve opening slots extends and which are arranged on all sides at such distances from one another that the screen basket wall has a mesh structure on the outlet side between the depressions. 2. Siekorb nach Anspruch 1, dadurch gekennzeichnet, daß die Vertiefungen kreiszylindrisch ausgebildet sind.2. Sieve basket according to claim 1, characterized in that the depressions are circular cylindrical. 3. Siebkorb nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Vertiefungen ein nach allen Richtungen regelmässiges Muster bilden.3. Screen basket according to claim 1 or 2, characterized in that the depressions form a regular pattern in all directions. 4. Siebkorb nach den Ansprüchen 2 und 3, dadurch gekennzeichnet, daß die Zentren der Vertiefungen - in der Ansicht der flachgelegten Siebkorbwand - die Ecken gleichseitiger Dreiecke bilden.4. Screen basket according to claims 2 and 3, characterized in that the centers of the depressions - in the view of the flat screen basket wall - form the corners of equilateral triangles. 5. Siebkorb nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Restwandstärke der Siebkorbwand am Grund der Vertiefungen ungefähr 1 mm, insbesondere ca. 0,8 bis 1,2 mm,beträgt.5. Screen basket according to one or more of claims 1 to 4, characterized in that the remaining wall thickness of the screen basket wall at the base of the depressions is approximately 1 mm, in particular approximately 0.8 to 1.2 mm. 6. Siebkorb nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Siebkorbwand an der Anströmseite parallel zueinander verlaufende Nuten aufweist, die sich über mehrere Vertiefungen hinweg erstrecken.6. strainer basket according to one or more of claims 1 to 5, characterized in that the strainer basket wall on the upstream side has mutually parallel grooves which extend over a plurality of depressions. 7. Siebkorb nach Anspruch 6, dadurch gekennzeichnet, daß die Nuten in Umfangsrichtung des Siebkorbs verlaufen und jeweils eine geschlossene Ringnut bilden.7. Screen basket according to claim 6, characterized in that the grooves extend in the circumferential direction of the screen basket and each form a closed annular groove. 8. Siebkorb nach Anspruch 6, dadurch gekennzeichnet, daß die Nuten zumindest ungefähr in Richtung der Siebkorbachse verlaufen.8. Screen basket according to claim 6, characterized in that the grooves run at least approximately in the direction of the screen basket axis. 9. Siebkorb nach Anspruch 8, dadurch gekennzeichnet, daß die Nuten im Abstand von den Enden des Siebkorbs enden.9. Screen basket according to claim 8, characterized in that the grooves end at a distance from the ends of the screen basket. 10. Siebkorb nach einem oder mehreren der Ansprüche 6 bis 9, dadurch gekennzeichnet, daß die Nuten in gleichen Abständen voneinander angeordnet sind.10. Sieve basket according to one or more of claims 6 to 9, characterized in that the grooves are arranged at equal distances from one another. 11. Siebkorb nach einem oder mehreren der Ansprüche 6 bis 9, dadurch gekennzeichnet, daß die Nuten eine Tiefe von ungefähr 1 mm, insbesondere von ca. 0,9 bis 1,3 mm, aufweisen.11. Sieve basket according to one or more of claims 6 to 9, characterized in that the grooves have a depth of approximately 1 mm, in particular of approximately 0.9 to 1.3 mm. 12. Siebkorb nach den Ansprüchen 5 und 11, dadurch gekennzeichnet, daß die Tiefe der Nuten geringfügig grösser ist als die Restwandstärke der Siebkorbwand am Grund der Vertiefungen.12. Strainer according to claims 5 and 11, characterized in that the depth of the grooves is slightly greater than the remaining wall thickness of the strainer wall at the bottom of the wells. 13. Siebkorb nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die auf der Anströmseite der Siebkorbwand vorgesehenen, die Sieböffnungsschlitze bildenden Ausnehmungen innerhalb des Bereichs der jeweiligen Vertiefung enden und insbesondere Laser-oder erosionsgeschnitten sind.13. Sieve basket according to one or more of claims 1 to 5, characterized in that the recesses provided on the upstream side of the sieve basket wall and forming the sieve opening slots end within the region of the respective recess and are in particular laser or erosion cut.
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
EP82103801A EP0093187B2 (en) 1982-05-04 1982-05-04 Screen drum for a pulp stock screening apparatus
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
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 true EP0093187A1 (en) 1983-11-09
EP0093187B1 EP0093187B1 (en) 1985-08-07
EP0093187B2 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)

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EP0236843A2 (en) * 1986-03-07 1987-09-16 J.M. Voith GmbH Sorting screen
EP0287267A2 (en) * 1987-04-16 1988-10-19 The Black Clawson Company Cylindrical Screen Plates
US4901417A (en) * 1987-08-05 1990-02-20 The Black Clawson Company Method of finishing screen plates
US5259512A (en) * 1989-12-06 1993-11-09 Hermann Finckh Maschinenfabrik Gmbh & Co. Screen for pressure sorters for fiber suspensions
WO2003091497A1 (en) * 2002-04-24 2003-11-06 Frejborg Frey A A screen section, screen cylinder, screening device, and method of screening fibrous material

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JPS6443318A (en) * 1987-08-10 1989-02-15 Arai Tekkosho Kk Multipurpose cylindrical element for filtration or separation
US5513757A (en) * 1994-06-02 1996-05-07 Sulzer Papertec Mansfield Inc. Continuous cut slotted screen basket
SE505400C2 (en) * 1995-11-08 1997-08-18 Capricell Ab Barrier for dewatering fiber suspensions
CN200954409Y (en) * 2006-06-27 2007-10-03 香港理工大学 Filters with better performance by reducing clogging
DE102018007294A1 (en) * 2018-09-14 2020-03-19 Guntram Krettek Process for fixing a sheet and filter device produced therewith

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EP0236843A2 (en) * 1986-03-07 1987-09-16 J.M. Voith GmbH Sorting screen
EP0236843A3 (en) * 1986-03-07 1987-11-04 J.M. Voith GmbH Sorting screen
EP0287267A2 (en) * 1987-04-16 1988-10-19 The Black Clawson Company Cylindrical Screen Plates
EP0287267A3 (en) * 1987-04-16 1989-07-05 The Black Clawson Company Screen plates
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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

Also Published As

Publication number Publication date
FI831508L (en) 1983-11-05
JPS58202007A (en) 1983-11-25
ATE14763T1 (en) 1985-08-15
JPH0246716B2 (en) 1990-10-17
EP0093187B2 (en) 1990-02-28
CA1205044A (en) 1986-05-27
FI831508A0 (en) 1983-05-03
DE3265205D1 (en) 1985-09-12
EP0093187B1 (en) 1985-08-07
FI74058B (en) 1987-08-31
US4529519A (en) 1985-07-16

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