EP1826315B1 - Rotor for pressure screen for fibrous suspensions - Google Patents

Rotor for pressure screen for fibrous suspensions Download PDF

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Publication number
EP1826315B1
EP1826315B1 EP06026125A EP06026125A EP1826315B1 EP 1826315 B1 EP1826315 B1 EP 1826315B1 EP 06026125 A EP06026125 A EP 06026125A EP 06026125 A EP06026125 A EP 06026125A EP 1826315 B1 EP1826315 B1 EP 1826315B1
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EP
European Patent Office
Prior art keywords
screen basket
drum
suspension
foils
cylinder
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Not-in-force
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EP06026125A
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German (de)
French (fr)
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EP1826315A2 (en
EP1826315A3 (en
Inventor
Werner Brettschneider
Rainer Meisenberg
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP1826315A2 publication Critical patent/EP1826315A2/en
Publication of EP1826315A3 publication Critical patent/EP1826315A3/en
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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
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils

Definitions

  • the invention relates to a device for cleaning suspensions according to the preamble of claim 1.
  • Such a device comprises a strainer basket, a housing enclosed thereby, which has an inlet for the suspension to be purified, an accepts outlet for the purified suspension and a reject outlet for impurities.
  • the apparatus further comprises a scraper device having scraper blades that pass close to the inner or outer surface of the screen basket.
  • the researcher can - seen in an axially perpendicular cross-section - have a wing profile. This causes the following: During the circulation of the clearing the wings exert with their front (head) area a pressure on the suspension to be cleaned in the direction of the Siebkorb Structure to the contained in the suspension accepts through the openings - slots, holes - Drift through strainer basket.
  • the rearward (tail) area is designed to exert a suction effect to suck out particles stuck in the openings of the screen basket, generally impurities.
  • the practitionerrappell can thus have a wing profile, but also designed differently. They are generally referred to as "Foil”.
  • Cleaning devices of this type are generally constructed vertically. This means that the screen baskets have a vertical axis, and accordingly also the axis of rotation of the clearing device is vertical. However, it is also possible a horizontal construction.
  • the cleaning devices are generally passed through the centrifugal principle. This means that the suspension to be cleaned is supplied to the interior of the screen basket.
  • the accept then passes through the openings of the screen basket to the outside, while the impurities - the so-called rejects - migrate down the inner surface of the screen basket, favored by the action of the clearing device, and be discharged through a reject outlet at the lower end of the screen basket.
  • the clearing device is usually located in the interior of the screen basket, and the intuitionrologyn or foils migrate along the inner surface of the screen basket.
  • Centrifugal operated cleaning or sorting machines have a disadvantage.
  • the space between the outside of the screen basket and the housing wall is usually very limited. It is therefore difficult to design and arrange the clearing device in such a way that it still effectively fulfills its function in the limited space.
  • the external arrangement of the broaching their removal must be done before the sieve can be removed, which is a disadvantage, since sieves must be serviced more often.
  • a screening device which can be operated centripetally.
  • a so-called cleaning drum is used, which is intended to achieve a pumping effect by utilizing the centrifugal force and with the aid of radially acting nozzles inserted into the cleaning drum. This will remove any material that is on the screen surface.
  • the invention has for its object to make a cleaning device of the type mentioned in such a way that a high sorting efficiency can be achieved that the structural complexity is relatively low, that the wear of the passing elements is low, and that the clearing effect of Clearing device is high.
  • the said drum has openings through which the material to be sorted can migrate in the direction of the screen basket. These can be kept relatively large area, since the drum is only a space-saving support element for the Foil wings.
  • the drum can be manufactured and designed in different ways. So it is possible to produce the drum as a perforated stainless steel cylinder. It can be produced from sheet metal by bending and only subsequently provided with openings, for example, by laser cutting or water jet cutting. This ensures the roundness of the drum. Only then are the Foil elements welded or screwed on. Screwed Foil elements can be easily replaced if they are worn or damaged. Both the drum body and the Foil elements can optionally be made of plastic.
  • the drum can be designed as a cage. It can be constructed, for example, of circumferential rings and paraxial rods, the rings and / or the rods carry multifoil elements.
  • the drum is generally provided with a lid. This can be welded or screwed to the jacket of the drum. In or on the cover may advantageously be a connection bushing for mounting the rotor to a shaft.
  • the cleaning device has a screen basket 1, which is cylindrical.
  • the screen basket 1 is located in a housing 2.
  • the housing 2 has an inlet 3 for the suspension to be cleaned, an outlet 4 for the accept and an outlet 5 for the rejects.
  • the strainer basket 1 can be of any type. In general, it consists of a precious metal sheet with round or slot-shaped screen openings.
  • the strainer basket 1 is surrounded by a drum 6.
  • the drum essentially consists of a cover plate 7 and a cylinder 8.
  • the drum 6 can be set in rotation by a drive 10 connected to the cover plate 7.
  • the cylinder 8 has openings, such as holes or slots. They are distributed over the entire cylindrical surface, so that therefore the remaining flow cross-sections are the same. However, an uneven distribution can also be chosen.
  • the cylinder 8 may also be constructed in the form of a cage of axially or obliquely extending rods and rings running in helix so that the perforations lie between the rods or rings.
  • the area of the openings can increase from bottom to top or vice versa. It is understood that the dimensions of these openings are considerably larger than the sieve opening, since no separation is to be made in them.
  • the cylinder 8 carries on its inside a variety of foils 9, which can take over the actual task of Siebfreihaltens optimally. They can have airfoil profile. They are attached in a larger number by means of spacers 13 on the cylinder 8 of the drum 6, for example by screws or welding. See the FIGS. 4 . 5 and 6 , They can be staggered, which has the advantage that disturbing pressure pulsations in the material leaving the device streams are avoided - see again FIG. 6 , Also, a large number of foils 9, based on the square mesh basket area improved the Räum Sign and evened the burden of Siebkorbes 1. Conveniently, a value between 2 and 10 foils per square meter screen area.
  • the invention makes it possible that even in tight spaces in the cleaning device, a reamer can be used at this point.
  • the radial thickness A is formed essentially by the wall thickness of the cylinder 8 plus twice the protruding height B of a foil.
  • the device shown is centripetally flowed through, that is, the suspension flows in relation to the screen basket 1 viewed from outside to inside. It first enters an annular space 11, formed from the cylinder 8 and the cylindrical housing wall. The suspension then passes through the perforations in the cylinder 8 of the drum 6 and passes to the screen basket 1. There, the accepts portion of the suspension is passed through the strainer 1 radially inwardly, so that it enters an annular space 12 and the accepts 4 flows. The reject, however, remains outside of the screen basket 1 and exits from the reject outlet 5.
  • FIG. 1 illustrates the centripetal flow of the screen basket.

Description

Die Erfindung betrifft eine Vorrichtung zum Reinigen von Suspensionen gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a device for cleaning suspensions according to the preamble of claim 1.

Eine solche Vorrichtung umfasst einen Siebkorb, ein von diesem umschlossenes Gehäuse, das einen Einlass für die zu reinigende Suspension, einen Gutstoffauslass für die gereinigte Suspension und einen Spuckstoffauslass für Verunreinigungen aufweist. Die Vorrichtung umfasst ferner eine Räumereinrichtung mit Räumerflügeln, die dicht an der Innen- oder Außenfläche des Siebkorbes entlang streichen. Die Räumerflügel können - in einem achssenkrechten Querschnitt gesehen - ein Tragflügelprofil aufweisen. Hierdurch wird folgendes bewirkt: Beim Umlauf der Räumeinrichtung üben die Tragflügel mit ihrem vorderen (Kopf-)Bereich einen Druck auf die zu reinigende Suspension in Richtung auf die Siebkorbfläche aus, um den in der Suspension enthaltenen Gutstoffanteil durch die Öffnungen - Schlitze, Bohrungen - des Siebkorbes hindurch zu treiben. Der in Umlaufrichtung hintere (Schwanz-) Bereich hingegen ist derart gestaltet, dass er eine Saugwirkung ausübt, um in den Öffnungen des Siebkorbes festsitzende Partikel - im Allgemeinen Verunreinigungen - herauszusaugen. Die Räumerflügel können somit ein Tragflügelprofil aufweisen, aber auch andersartig gestaltet sein. Sie werden im Allgemeinen als "Foil" bezeichnet.Such a device comprises a strainer basket, a housing enclosed thereby, which has an inlet for the suspension to be purified, an accepts outlet for the purified suspension and a reject outlet for impurities. The apparatus further comprises a scraper device having scraper blades that pass close to the inner or outer surface of the screen basket. The Räumerflügel can - seen in an axially perpendicular cross-section - have a wing profile. This causes the following: During the circulation of the clearing the wings exert with their front (head) area a pressure on the suspension to be cleaned in the direction of the Siebkorbfläche to the contained in the suspension accepts through the openings - slots, holes - Drift through strainer basket. The rearward (tail) area, on the other hand, is designed to exert a suction effect to suck out particles stuck in the openings of the screen basket, generally impurities. The Räumerflügel can thus have a wing profile, but also designed differently. They are generally referred to as "Foil".

Maschinen dieser Art sind in vielfachen Variationen bekannt. Siehe US 4 287 055 A , DE 30 23 902 A1 , US 3 545 621 .Machines of this type are known in many variations. Please refer US 4,287,055 A . DE 30 23 902 A1 . US 3,545,621 ,

Reinigungsvorrichtungen dieser Art sind im Allgemeinen vertikal aufgebaut. Das heißt, dass die Siebkörbe eine vertikale Achse aufweisen, und demgemäß auch die Drehachse der Räumeinrichtung vertikal verläuft. Es ist jedoch auch eine horizontale Bauweise möglich.Cleaning devices of this type are generally constructed vertically. This means that the screen baskets have a vertical axis, and accordingly also the axis of rotation of the clearing device is vertical. However, it is also possible a horizontal construction.

Die Reinigungsvorrichtungen werden im Allgemeinen nach dem Zentrifugalprinzip durchströmt. Dies bedeutet, dass die zu reinigende Suspension dem Innenraum des Siebkorbes zugeführt wird. Der Gutstoff tritt sodann durch die Öffnungen des Siebkorbes nach außen hindurch, während die Verunreinigungen - der sogenannte Spuckstoff - an der Innenfläche des Siebkorbes nach unten wandern, begünstigt durch die Wirkung der Räumeinrichtung, und am unteren Ende des Siebkorbes durch einen Spuckstoffauslass abgeführt werden. Die Räumeinrichtung befindet sich zumeist im Innenraum des Siebkorbes, und die Räumerleisten oder Foils wandern an der Innenfläche des Siebkorbes entlang.The cleaning devices are generally passed through the centrifugal principle. This means that the suspension to be cleaned is supplied to the interior of the screen basket. The accept then passes through the openings of the screen basket to the outside, while the impurities - the so-called rejects - migrate down the inner surface of the screen basket, favored by the action of the clearing device, and be discharged through a reject outlet at the lower end of the screen basket. The clearing device is usually located in the interior of the screen basket, and the Räumerleisten or foils migrate along the inner surface of the screen basket.

Es gibt aber auch zentripetale Maschinen. Dabei wird dem Siebkorb die zu reinigende Suspension von außen her zugeführt. Der Gutstoff tritt somit durch die Öffnungen des Siebkorbes von außen nach innen hindurch. Er wird sodann aus dem Inneren des Siebkorbes abgeführt, während der Spuckstoff an der Außenfläche des Siebkorbes zurückgehalten wird und nach unten sinkt. Die Räumeinrichtung kann hierbei auf der Außenseite des Siebkorbes angeordnet sein, aber auch auf der Innenseite. Siehe US 3 545 621 , dort Figuren 1 und 2.But there are also centripetal machines. The screen to be cleaned suspension is supplied from the outside. The accepts thus passes through the openings of the screen basket from outside to inside. It is then removed from the interior of the screen basket, while the reject is retained on the outer surface of the screen basket and sinks down. The clearing device can be arranged on the outside of the screen basket, but also on the inside. Please refer US 3,545,621 , there Figures 1 and 2 ,

Zentripetal betriebene Reinigungs- oder Sortiermaschinen haben einen Nachteil. Der Raum zwischen der Außenseite des Siebkorbes und der Gehäusewand ist meist sehr begrenzt. Es ist daher schwierig, die Räumeinrichtung entsprechend so zu gestalten und anzuordnen, dass sie in dem begrenzten Raum noch ihre Funktion wirksam erfüllt. Außerdem muss bei der Außen-Anordnung der Räumeinrichtung deren Ausbau erfolgen, bevor das Sieb ausgebaut werden kann, was ein Nachteil ist, da Siebe öfters gewartet werden müssen.Centrifugal operated cleaning or sorting machines have a disadvantage. The space between the outside of the screen basket and the housing wall is usually very limited. It is therefore difficult to design and arrange the clearing device in such a way that it still effectively fulfills its function in the limited space. In addition, the external arrangement of the broaching their removal must be done before the sieve can be removed, which is a disadvantage, since sieves must be serviced more often.

Aus der DE 29 08 729 A1 ist eine Siebvorrichtung bekannt, die zentripetal betrieben werden kann. Zur Freihaltung des Siebkorbes wird eine sogenannte Reinigungstrommel verwendet, die unter Ausnutzung der Fliehkraft und mit Hilfe von in die Reinigungstrommel eingesetzten radial wirkenden Düsen eine Pumpwirkung erzielen soll. Dadurch soll Material, das sich auf der Sieboberfläche befindet, entfernt werden.From the DE 29 08 729 A1 a screening device is known which can be operated centripetally. To keep the screen basket free, a so-called cleaning drum is used, which is intended to achieve a pumping effect by utilizing the centrifugal force and with the aid of radially acting nozzles inserted into the cleaning drum. This will remove any material that is on the screen surface.

Der Erfindung liegt die Aufgabe zugrunde, eine Reinigungsvorrichtung der eingangs genannten Art derart zu gestalten, dass sich ein hoher Sortier-Wirkungsgrad erzielen lässt, dass der bauliche Aufwand relativ gering ist, dass der Verschleiß der aneinander vorbeilaufenden Elemente gering ist, und dass die Räumwirkung der Räumeinrichtung hoch ist.The invention has for its object to make a cleaning device of the type mentioned in such a way that a high sorting efficiency can be achieved that the structural complexity is relatively low, that the wear of the passing elements is low, and that the clearing effect of Clearing device is high.

Diese Aufgabe wird durch eine Reinigungsvorrichtung gemäß Anspruch 1 gelöst.This object is achieved by a cleaning device according to claim 1.

Die wesentlichen Merkmale einer solchen Reinigungsvorrichtung sind die folgenden:

  • Die Reinigungsvorrichtung wird von der zu reinigenden Suspension zentripetal durchströmt, das heißt von außen nach innen.
  • Die Räumeinrichtung befindet sich an der Außenseite des Siebkorbes.
  • Die Räumeinrichtung umfasst eine Trommel, die den Siebkorb umgibt und die auf ihrer Innenseite eine Vielzahl von Foil-Flügeln aufweist.
The essential features of such a cleaning device are the following:
  • The cleaning device is flowed centripetally through the suspension to be cleaned, that is from outside to inside.
  • The clearing device is located on the outside of the screen basket.
  • The clearing device comprises a drum which surrounds the screen basket and has on its inside a plurality of Foil wings.

Hierdurch ergibt sich vor allem eine gute Ausnutzung des an dieser Stelle der Reinigungsvorrichtung zur Verfügung stehenden Raumes. Der Verschleiß der beteiligten Bauteile ist gering. Die Störstoffe oder Verunreinigungen werden in geringem Maße zerkleinert. Der Bauaufwand und damit die Herstellungskosten halten sich in Grenzen.This results above all in a good utilization of the space available at this point of the cleaning device. The wear of the components involved is low. The impurities or impurities are crushed to a small extent. The construction costs and thus the production costs are limited.

Die genannte Trommel weist Durchbrechungen auf, durch welche der zu sortierende Stoff in Richtung auf den Siebkorb hindurchwandern kann. Diese können relativ großflächig gehalten werden, da die Trommel lediglich ein platzsparendes Stützelement für die Foil-Flügel ist.The said drum has openings through which the material to be sorted can migrate in the direction of the screen basket. These can be kept relatively large area, since the drum is only a space-saving support element for the Foil wings.

Die Trommel kann auf unterschiedliche Weise hergestellt und gestaltet sein. So ist es möglich, die Trommel als perforierten Edelstahlzylinder herzustellen. Er kann aus Blech durch Biegen erzeugt und erst nachträglich mit Öffnungen versehen werden, beispielsweise durch Laserschneiden oder Wasserstrahlschneiden. Dadurch wird die Rundheit der Trommel gewährleistet. Erst anschließend werden die Foil-Elemente angeschweißt oder angeschraubt. Angeschraubte Foil-Elemente können leicht ersetzt werden, falls sie verschlissen oder beschädigt sind. Sowohl der Trommelkörper als auch die Foil-Elemente können wahlweise auch aus Kunststoff gefertigt sein.The drum can be manufactured and designed in different ways. So it is possible to produce the drum as a perforated stainless steel cylinder. It can be produced from sheet metal by bending and only subsequently provided with openings, for example, by laser cutting or water jet cutting. This ensures the roundness of the drum. Only then are the Foil elements welded or screwed on. Screwed Foil elements can be easily replaced if they are worn or damaged. Both the drum body and the Foil elements can optionally be made of plastic.

Auch kann die Trommel als Käfig gestaltet sein. Sie kann beispielsweise aus umlaufenden Ringen und achsparallelen Stäben aufgebaut sein, wobei die Ringe und/oder die Stäbe Multifoil-Elemente tragen.Also, the drum can be designed as a cage. It can be constructed, for example, of circumferential rings and paraxial rods, the rings and / or the rods carry multifoil elements.

Die Trommel ist im Allgemeinen mit einem Deckel versehen. Dieser kann mit dem Mantel der Trommel verschweißt oder verschraubt werden. Im oder am Deckel kann mit Vorteil eine Anschlussbüchse für die Befestigung des Rotors an einer Welle vorhanden sein.The drum is generally provided with a lid. This can be welded or screwed to the jacket of the drum. In or on the cover may advantageously be a connection bushing for mounting the rotor to a shaft.

Die Erfindung ist an Hand der Zeichnung näher erläutert. Darin ist im Einzelnen folgendes dargestellt:

Figur 1
zeigt eine Reinigungsvorrichtung in schematischer Darstellung in einem Axialschnitt.
Figur 2
zeigt die Reinigungsmaschine gemäß Figur 1 in einem achssenkrechten Schnitt.
Figur 3
zeigt in vergrößerter Darstellung einen Ausschnitt aus dem Sieb, wiederum in einem achssenkrechten Schnitt.
Figur 4
zeigt in vergrößerter Darstellung in einem achssenkrechten Schnitt die Trommel mit Foils.
Figur 5
zeigt die Trommel mit den Foils in einem Axialschnitt.
Figur 6
ist eine Ansicht auf die Innenseite der Trommel in einer Abwicklungs-Darstellung.
The invention is explained in more detail with reference to the drawing. The following is shown in detail:
FIG. 1
shows a cleaning device in a schematic representation in an axial section.
FIG. 2
shows the cleaning machine according to FIG. 1 in an axial section.
FIG. 3
shows an enlarged view of a section of the sieve, again in an axially perpendicular section.
FIG. 4
shows in an enlarged view in an axial section the drum with foils.
FIG. 5
shows the drum with the foils in an axial section.
FIG. 6
is a view of the inside of the drum in a development representation.

Aus den Figuren 1 und 2 erkennt man die erfindungsgemäße Reinigungsvorrichtung. Sie weist einen Siebkorb 1 auf, der zylindrisch ist. Der Siebkorb 1 befindet sich in einem Gehäuse 2. Das Gehäuse 2 weist einen Zulauf 3 für die zu reinigende Suspension auf, einen Auslauf 4 für den Gutstoff sowie einen Auslass 5 für den Spuckstoff. Der Siebkorb 1 kann von jeglicher Bauart sein. Im Allgemeinen besteht er aus einem Edelmetall-Blech mit runden oder schlitzförmigen Sieböffnungen.From the Figures 1 and 2 one recognizes the cleaning device according to the invention. It has a screen basket 1, which is cylindrical. The screen basket 1 is located in a housing 2. The housing 2 has an inlet 3 for the suspension to be cleaned, an outlet 4 for the accept and an outlet 5 for the rejects. The strainer basket 1 can be of any type. In general, it consists of a precious metal sheet with round or slot-shaped screen openings.

Der Siebkorb 1 ist von einer Trommel 6 umgeben. Die Trommel besteht im Wesentlichen aus einer Deckelplatte 7 und einem Zylinder 8. Die Trommel 6 kann durch einen mit der Deckelplatte 7 verbundenen Antrieb 10 in Rotation versetzt werden. Der Zylinder 8 weist Durchbrechungen auf, beispielsweise Bohrungen oder Schlitze. Sie sind über die gesamte Zylinderfläche verteilt, so dass also die frei bleibenden Durchströmungsquerschnitte gleich sind. Jedoch kann auch eine ungleichmäßige Verteilung gewählt werden. Der Zylinder 8 kann auch käfigförmig aus axial oder schräg verlaufenden Stäben sowie in Schraubenlinie verlaufenden Ringen so aufgebaut sein, dass zwischen den Stäben oder Ringen die Durchbrechungen liegen. Die Fläche der Durchbrechungen kann von unten nach oben zunehmen oder umgekehrt. Es versteht sich, dass die Abmessungen dieser Durchbrechungen beträchtlich größer sind als die Sieböffnung, da in ihnen keine Trennung vorgenommen werden soll.The strainer basket 1 is surrounded by a drum 6. The drum essentially consists of a cover plate 7 and a cylinder 8. The drum 6 can be set in rotation by a drive 10 connected to the cover plate 7. The cylinder 8 has openings, such as holes or slots. They are distributed over the entire cylindrical surface, so that therefore the remaining flow cross-sections are the same. However, an uneven distribution can also be chosen. The cylinder 8 may also be constructed in the form of a cage of axially or obliquely extending rods and rings running in helix so that the perforations lie between the rods or rings. The area of the openings can increase from bottom to top or vice versa. It is understood that the dimensions of these openings are considerably larger than the sieve opening, since no separation is to be made in them.

Der Zylinder 8 trägt auf seiner Innenseite eine Vielzahl von Foils 9, die die eigentliche Aufgabe des Siebfreihaltens optimal übernehmen können. Sie können Tragflächenprofil aufweisen. Sie sind in einer größeren Anzahl mittels Abstandhaltern 13 am Zylinder 8 der Trommel 6 befestigt, beispielsweise durch Schrauben oder Schweißen. Siehe die Figuren 4, 5 und 6. Sie können versetzt angeordnet sein, was den Vorteil hat, dass störende Druckpulsationen in den die die Vorrichtung verlassenden Stoffströmen vermieden werden - siehe wiederum Figur 6. Auch eine große Anzahl von Foils 9, bezogen auf den Quadratmeter Siebkorbfläche verbessert die Räumwirkung und vergleichmäßigt die Belastung des Siebkorbes 1. Günstig ist ein Wert zwischen 2 und 10 Foils pro Quadratmeter Siebfläche.The cylinder 8 carries on its inside a variety of foils 9, which can take over the actual task of Siebfreihaltens optimally. They can have airfoil profile. They are attached in a larger number by means of spacers 13 on the cylinder 8 of the drum 6, for example by screws or welding. See the FIGS. 4 . 5 and 6 , They can be staggered, which has the advantage that disturbing pressure pulsations in the material leaving the device streams are avoided - see again FIG. 6 , Also, a large number of foils 9, based on the square mesh basket area improved the Räumwirkung and evened the burden of Siebkorbes 1. Conveniently, a value between 2 and 10 foils per square meter screen area.

Die Erfindung macht es möglich, dass auch bei engen Platzverhältnissen in der Reinigungsvorrichtung ein Räumer an dieser Stelle eingesetzt werden kann. Das gilt insbesondere dann, wenn die radiale Dicke A der Trommel 6 mit den Foils 9 maximal 20 %, vorzugsweise maximal 10 %, des Außendurchmesser D der Trommel 6 beträgt. Dabei wird die radiale Dicke A im Wesentlichen durch die Wandstärke des Zylinders 8 plus 2 Mal die überstehende Höhe B eines Foils gebildet.The invention makes it possible that even in tight spaces in the cleaning device, a reamer can be used at this point. This applies in particular when the radial thickness A of the drum 6 with the foils 9 is at most 20%, preferably at most 10%, of the outer diameter D of the drum 6. In this case, the radial thickness A is formed essentially by the wall thickness of the cylinder 8 plus twice the protruding height B of a foil.

Die dargestellte Vorrichtung ist zentripetal durchströmt, das heißt die Suspension strömt in Bezug auf den Siebkorb 1 betrachtet von außen nach innen. Sie gelangt zunächst in einen Ringraum 11, gebildet aus dem Zylinder 8 und der zylindrischen Gehäusewand. Die Suspension tritt sodann durch die Durchbrechungen im Zylinder 8 der Trommel 6 hindurch und gelangt zum Siebkorb 1. Dort wird der Gutstoff-Anteil der Suspension durch den Siebkorb 1 radial nach innen hindurch gelassen, so dass er in einen Ringraum 12 eintritt und zum Gutstoffauslass 4 strömt. Der Spuckstoff hingegen verbleibt außerhalb des Siebkorbes 1 und tritt aus dem Spuckstoffauslass 5 aus.The device shown is centripetally flowed through, that is, the suspension flows in relation to the screen basket 1 viewed from outside to inside. It first enters an annular space 11, formed from the cylinder 8 and the cylindrical housing wall. The suspension then passes through the perforations in the cylinder 8 of the drum 6 and passes to the screen basket 1. There, the accepts portion of the suspension is passed through the strainer 1 radially inwardly, so that it enters an annular space 12 and the accepts 4 flows. The reject, however, remains outside of the screen basket 1 and exits from the reject outlet 5.

Figur 1 veranschaulicht die zentripetale Anströmung des Siebkorbes 1. FIG. 1 illustrates the centripetal flow of the screen basket. 1

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Siebkorbstrainer
22
Gehäusecasing
33
Zulauf der zu reinigenden SuspensionFeed of the suspension to be purified
44
Gutstoffauslassaccept outlet
55
Spuckstoffauslassrejects outlet
66
Trommeldrum
77
Deckelplattecover plate
88th
Zylindercylinder
99
FoilFoil
1010
Antriebdrive
1111
Ringraumannulus
1212
Ringraumannulus
1313
Abstandshalterspacer

Claims (6)

  1. Apparatus for cleaning a suspension, preferably a fibre-containing suspension for papermaking;
    having a screen basket to the outer surface of which the suspension to be cleaned is fed and from the inner surface of which the screened accepted material is discharged;
    having a housing (2) which surrounds the screen basket and has a feed (3) for the suspension to be cleaned, an accepted material outlet (4) for the cleaned suspension and a rejected material outlet (5) for impurities;
    having a cleaning device which runs around the screen basket axis on the outer side of the screen basket and has foils which sweep along on the outer surface of the screen basket (1),
    the cleaning device comprising a drum (6) with a cylinder (8) which surrounds the screen basket (1), and
    the cylinder (8) being provided with apertures,
    characterized in that
    the cylinder (8) carries a multiplicity of foils (9) on its inner side facing the screen basket (1), and the number of foils (9) per square metre of screen basket area is between 2 and 10.
  2. Apparatus according to Claim 1,
    characterized in that
    the screen basket (1) is arranged vertically.
  3. Apparatus according to Claim 1 or 2,
    characterized in that
    the drum (6) can be rotated in the circumferential direction about the axis of the screen basket (1).
  4. Apparatus according to one of Claims 1 to 3,
    characterized in that
    the cylinder (8) of the drum is built up from a cage.
  5. Apparatus according to one of Claims 1 to 4,
    characterized in that
    the foils (9) have an aerofoil profile.
  6. Apparatus according to one of the preceding claims,
    characterized in that
    the radial thickness (A) of the drum (6) with the foils (9) is at most 20%, preferably at most 10%, of the external diameter (D) of the drum (6).
EP06026125A 2006-02-24 2006-12-16 Rotor for pressure screen for fibrous suspensions Not-in-force EP1826315B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006008758A DE102006008758A1 (en) 2006-02-24 2006-02-24 Rotor for a pressure sorter for fiber suspensions

Publications (3)

Publication Number Publication Date
EP1826315A2 EP1826315A2 (en) 2007-08-29
EP1826315A3 EP1826315A3 (en) 2009-07-15
EP1826315B1 true EP1826315B1 (en) 2012-06-06

Family

ID=38093598

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06026125A Not-in-force EP1826315B1 (en) 2006-02-24 2006-12-16 Rotor for pressure screen for fibrous suspensions

Country Status (4)

Country Link
US (1) US7597201B2 (en)
EP (1) EP1826315B1 (en)
JP (1) JP2007224491A (en)
DE (1) DE102006008758A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8118173B2 (en) * 2008-12-03 2012-02-21 Westlake Longview Corp. Streamer trap assembly
DE102008063972A1 (en) * 2008-12-19 2010-07-01 Hochland Ag Filter for use in processed cheese production
US8011515B2 (en) * 2009-05-12 2011-09-06 Ovivo Luxembourg S.á.r.l. Two stage pulp screening device with two stationary cylindrical screens
CN102641773B (en) * 2012-05-03 2012-12-19 赣州金环磁选设备有限公司 Grading pump for beneficiation operation and application thereof
JP6117683B2 (en) * 2013-01-10 2017-04-19 相川鉄工株式会社 Papermaking screen device

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3029951A (en) * 1958-09-24 1962-04-17 Bird Machine Co Screening device
US3092578A (en) * 1959-01-16 1963-06-04 Bird Machine Co Screening apparatus
US3456793A (en) * 1966-01-24 1969-07-22 Beloit Corp Dual pressure stock screen
FR1546515A (en) * 1967-06-14 1968-11-22 Lamort E & M Apparatus for cleaning liquids containing suspended solids such as paper pulp
US3933649A (en) * 1971-03-01 1976-01-20 Ahlfors S E E Apparatus for purifying and fractionating particle suspensions
SE374148B (en) * 1972-08-31 1975-02-24 S E E Ahlfors
SE420331B (en) * 1978-03-08 1981-09-28 Svenska Traeforskningsinst PROCEDURE OF A SILAN DEVICE FOR CLEANING THE OPENS IN A SILVER PLATE IN THE FORM OF A DRUM AND DEVICE FOR EXECUTING THE PROCEDURE
DE2830386C2 (en) * 1978-07-11 1982-09-02 Hermann Finckh, Maschinenfabrik GmbH & Co, 7417 Pfullingen Process for sorting fiber suspensions and pressure sorters for carrying out the process
DE3023902A1 (en) * 1980-06-26 1982-01-14 J.M. Voith Gmbh, 7920 Heidenheim Fibre suspension filter - has structured rotating cleaning heads to reduce pressure and volume surges
JPS61153114A (en) * 1984-12-25 1986-07-11 Mitsubishi Heavy Ind Ltd Screening apparatus
DE3503241A1 (en) * 1985-01-31 1986-08-07 J.M. Voith Gmbh, 7920 Heidenheim SORTER, ESPECIALLY VERTICAL Sifter
DE4000248A1 (en) * 1990-01-06 1991-07-11 Emil Holz ROTOR FOR PRESSURE SORTER FOR SORTING FIBER SUSPENSIONS
JPH0657675A (en) * 1992-08-10 1994-03-01 Aikawa Tekko Kk Agitator for paper-making screen
JPH0995888A (en) * 1995-10-02 1997-04-08 Aikawa Iron Works Co Ltd Screen device for production of paper
JP3190305B2 (en) * 1998-02-18 2001-07-23 相川鉄工株式会社 Screen device

Also Published As

Publication number Publication date
EP1826315A2 (en) 2007-08-29
US20070199883A1 (en) 2007-08-30
DE102006008758A1 (en) 2007-08-30
JP2007224491A (en) 2007-09-06
EP1826315A3 (en) 2009-07-15
US7597201B2 (en) 2009-10-06

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