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EP0414119A1 - Screening cylinder - Google Patents

Screening cylinder Download PDF

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Publication number
EP0414119A1
EP0414119A1 EP90115652A EP90115652A EP0414119A1 EP 0414119 A1 EP0414119 A1 EP 0414119A1 EP 90115652 A EP90115652 A EP 90115652A EP 90115652 A EP90115652 A EP 90115652A EP 0414119 A1 EP0414119 A1 EP 0414119A1
Authority
EP
European Patent Office
Prior art keywords
groove
flank
grooves
shaped grooves
curvature
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
EP90115652A
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German (de)
French (fr)
Other versions
EP0414119B1 (en
Inventor
Kurt Dipl.-Ing. Beisenherz
Waldemar R. Knodel
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.)
Fiedler Heinrich GmbH and Co KG
Original Assignee
Fiedler Heinrich GmbH and Co KG
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Publication date
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Application filed by Fiedler Heinrich GmbH and Co KG filed Critical Fiedler Heinrich GmbH and Co KG
Publication of EP0414119A1 publication Critical patent/EP0414119A1/en
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Publication of EP0414119B1 publication Critical patent/EP0414119B1/en
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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 cylindrical screen baskets for classifying fiber suspensions according to the preamble of claim 1.
  • Sieve baskets of the generic type are e.g. known from DE-PS 34 00 423. Such a design is intended to prevent a sharp increase in the resistance to penetration of the screen. However, the quality of the sorting result and therefore the efficiency of the sorting process are not good. This also applies to a symmetrical, undulating configuration of the surface of the screen.
  • the object of the invention is to further develop a screen basket according to the preamble of claim 1 so that it has the highest possible sorting performance, ie. H. results in a high efficiency and a good quality of the sorting of the fibers through the sieve.
  • the curved design of the grooves, with which discontinuities in the shape of the grooves are avoided, and the rounding at the transition edges prevent the fabric from remaining in places where sharp edges, corners or the like occur, and this is achieved is that an optimal flow ratio, a high flow rate and a high throughput is achieved because the flow is not slowed down by sharp edges or corners, the flushing of the groove is flawless and fibers cannot get stuck.
  • groove-shaped grooves 2 are provided on the inside of the casing parallel to the longitudinal axis, starting from the cylindrical inner wall 3 of the strainer surface. These grooves 2 (with respect to the direction of flow of the fiber suspension shown by the arrow) have a downstream flank 4 of greater curvature and an upstream flank 5 of lesser curvature. Continuous openings 6 run in the radial direction between the grooves 2 and the outside 7 of the strainer basket 1, which open into the grooves 2 at the deepest point according to FIG. can also open into the flank 4, as shown in Fig. 2. With 8, 9, the rounded transition edges of the grooves 2 are shown in the inner wall of the cylindrical screen basket 1.
  • the total width of the grooves 2 is indicated by B, B1 and B2 denote the two hypotenuse sections, which is drawn through the point of greatest depth t of the groove 2 at right angles to the hypotenuse B.
  • the total width B preferably has approximately twice to three times the value of the maximum depth t, while the ratio B1: B2 in the illustration according to FIG. 1 approximately from 1: 2 to 1: 4, and in FIG. 2 the ratio B1: B2 approximately 1: 1 to 4: 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Centrifugal Separators (AREA)

Abstract

A screening cylinder for the grading of fibre suspensions has, on the outside, slot-shaped grooves (2) which are formed arcuately with higher curvature on the downstream flank (4) and with lower curvature on the upstream flank (5); the screening orifices (6) open into the slot-shaped grooves (2) approximately at the lowest point. In a modified embodiment of a screening cylinder of this type, the slot-shaped grooves (2) are formed arcuately with higher curvature on the downstream flank (4) and with lower curvature on the upstream flank (5); the screening orifices (6) open into the flank (5) of lower curvature. <IMAGE>

Description

Die Erfindung bezieht sich auf zylindrische Siebkörbe zum Klassieren von Fasersuspensionen nach dem Oberbegriff des Anspruches 1.The invention relates to cylindrical screen baskets for classifying fiber suspensions according to the preamble of claim 1.

Siebkörbe der gattungsgemäßen Art sind z.B. aus der DE-PS 34 00 423 bekannt. Mit einer derartigen Ausführung soll eine starke Erhöhung des Durchtrittswiderstandes des Siebes verhindert werden. Hierbei wird jedoch kein gute Qualität des Sortierergebnisses und damit kein guter Wirkungsgrad des Sortiervorganges erreicht. Dies trifft auch zu für eine symmetrische, wellenförmige Ausgestaltung der Oberfläche des Siebes.Sieve baskets of the generic type are e.g. known from DE-PS 34 00 423. Such a design is intended to prevent a sharp increase in the resistance to penetration of the screen. However, the quality of the sorting result and therefore the efficiency of the sorting process are not good. This also applies to a symmetrical, undulating configuration of the surface of the screen.

Aufgabe der Erfindung ist es demgegenüber, einen Siebkorb nach dem Oberbegriff des Anspruches 1 so weiter zu ent­wickeln, daß er eine möglichst hohe Sortierleistung, d. h. einen hohen Wirkungsgrad und eine gute Qualität der Sortie­rung der Fasern durch das Sieb ergibt.In contrast, the object of the invention is to further develop a screen basket according to the preamble of claim 1 so that it has the highest possible sorting performance, ie. H. results in a high efficiency and a good quality of the sorting of the fibers through the sieve.

Gemäß der Erfindung wird dies mit den Merkmalen des Kennzei­chens des Anspruches 1 bzw. Anspruches 2 erreicht.According to the invention, this is achieved with the features of the characterizing part of claim 1 or claim 2.

Durch die gekrümmte Ausgestaltung der Rillen, mit der Unstetigkeiten in der Form der Rillen vermieden werden, und durch die Rundung an den Übergangskanten läßt sich vermeiden, daß der Stoff an Stellen, an denen scharfe Kanten, Ecken oder dergleichen auftreten, liegenbleibt, und daß erreicht wird, daß ein optimales Strömungsverhältnis, eine hohe Strömungsge­schwindigkeit und eine hohe Durchsatzmenge erreicht wird, da der Durchfluß nicht durch scharfe Kanten oder Ecken abge­bremst wird, die Spülung der Nut einwandfrei ist und Fasern nicht hängenbleiben können.The curved design of the grooves, with which discontinuities in the shape of the grooves are avoided, and the rounding at the transition edges prevent the fabric from remaining in places where sharp edges, corners or the like occur, and this is achieved is that an optimal flow ratio, a high flow rate and a high throughput is achieved because the flow is not slowed down by sharp edges or corners, the flushing of the groove is flawless and fibers cannot get stuck.

Nachstehend wird die Erfindung in Verbindung mit der Zeich­nung anhand eines Ausführungsbeispieles erläutert. Es zeigt:

  • Fig. 1 eine Schnittdarstellung durch die Wandung eines Siebkorbes nach einer Ausführungsform der Erfindung,
  • Fig. 2 eine Schnittdarstellung durch die Wandung eines Siebkorbes nach einer weiteren Ausführungsform der Erfindung, und
  • Fig. 3 eine Schnittdarstellung durch die Wandung einer ebenen Siebplatte.
The invention is explained below in connection with the drawing using an exemplary embodiment. It shows:
  • 1 is a sectional view through the wall of a screen basket according to an embodiment of the invention,
  • Fig. 2 is a sectional view through the wall of a screen basket according to a further embodiment of the invention, and
  • Fig. 3 is a sectional view through the wall of a flat screen plate.

In die Wandung des Siebkorbes 1 sind auf der Mantelinnenseite parallel zur Längsachse verlaufende nutenförmige Rillen 2, ausgehend von der zylindrischen Innenwand 3 der Siebfläche, vorgesehen. Diese Rillen 2 haben (in bezug auf die durch Pfeil dargestellte Durchflußrichtung der Fasersuspension) eine stromabwärts gelegene Flanke 4 stärkerer Krümmung und eine stromaufwärts gelegene Flanke 5 geringerer Krümmung. Zwischen den Rillen 2 und der Außenseite 7 des Siebkorbes 1 verlaufen in radialer Richtung durchgehende Öffnungen 6, die nach Fig. 1 an der tiefsten Stelle in die Rillen 2 münden, die aber für spezielle Fasersuspensionen bzw. bestimmte Anwendungsfälle in die Flanke 5 oder ggf. auch in die Flanke 4 münden können, wie in Fig. 2 dargestellt. Mit 8, 9 sind die gerundeten Übergangskanten der Rillen 2 in die Innenwand des zylindrischen Siebkorbes 1 dargestellt.In the wall of the strainer basket 1, groove-shaped grooves 2 are provided on the inside of the casing parallel to the longitudinal axis, starting from the cylindrical inner wall 3 of the strainer surface. These grooves 2 (with respect to the direction of flow of the fiber suspension shown by the arrow) have a downstream flank 4 of greater curvature and an upstream flank 5 of lesser curvature. Continuous openings 6 run in the radial direction between the grooves 2 and the outside 7 of the strainer basket 1, which open into the grooves 2 at the deepest point according to FIG. can also open into the flank 4, as shown in Fig. 2. With 8, 9, the rounded transition edges of the grooves 2 are shown in the inner wall of the cylindrical screen basket 1.

Die Gesamtbreite der Rillen 2 ist mit B angedeutet, B1 und B2 bezeichnen die beiden Hypotenusenabschnitte, die durch die Stelle größter Tiefe t der Rille 2 im rechten Winkel zur Hypotenuse B gezogen wird. Vorzugsweise hat die Gesamtbreite B etwa den doppelten bis dreifachen Wert der maximalen Tiefe t, während das Verhältnis B1:B2 bei der Darstellung nach Fig. 1 etwa von 1:2 bis 1:4, und in Fig. 2 das Verhältnis B1:B2 etwa 1:1 bis 4:1 beträgt.The total width of the grooves 2 is indicated by B, B1 and B2 denote the two hypotenuse sections, which is drawn through the point of greatest depth t of the groove 2 at right angles to the hypotenuse B. The total width B preferably has approximately twice to three times the value of the maximum depth t, while the ratio B1: B2 in the illustration according to FIG. 1 approximately from 1: 2 to 1: 4, and in FIG. 2 the ratio B1: B2 approximately 1: 1 to 4: 1.

Claims (5)

1. Zylindrischer Siebkorb zum Klassieren von Fasersuspensio­nen, dessen Zylinderwand durchgehende Sieböffnungen aufweist, die auf der Innenseite einem Rotor zugeordnet sind und auf der Außenseite in nutenförmige Rillen münden, welche auf der strömungsseitigen Oberfläche angebracht sind und sich im wesentlichen quer zur Strömungsrichtung der Fasersuspension erstrecken, wobei die stromaufwärts und die stromabwärts gelegenen Flanken der Rillen unterschiedliche Neigung bzw. Neigungswinkel haben,
dadurch gekennzeichnet, daß a) die nutenförmigen Rillen (2) bogenförmig mit stärkerer Krümmung (Breite B1) an der stromabwärts liegenden Flanke (4) und mit schwächerer Krümmung (Breite B2) an der stromaufwärts liegenden Flanke (5) ausgebildet sind, und b) die Sieböffnungen (6) im wesentlichen an der tiefsten Stelle in die nutenförmigen Rillen (2) münden. 1. Cylindrical sieve basket for classifying fiber suspensions, the cylinder wall of which has continuous sieve openings which are assigned a rotor on the inside and open on the outside in groove-shaped grooves which are provided on the flow-side surface and extend essentially transversely to the flow direction of the fiber suspension, the upstream and downstream flanks of the grooves have different inclinations and inclinations,
characterized in that a) the groove-shaped grooves (2) are arcuate with a greater curvature (width B1) on the downstream flank (4) and with a weaker curvature (width B2) on the upstream flank (5), and b) the sieve openings (6) open essentially at the deepest point in the groove-shaped grooves (2). 2. Zylindrischer Siebkorb zum Klassieren von Fasersuspensio­nen, dessen Zylinderwand durchgehende Sieböffnungen aufweist, die auf der Außenseite einem Rotor zugeordnet sind und auf der Innenseite in nutenförmige Rillen münden, welche auf der strömungsseitigen Oberfläche angebracht sind und sich im wesentlichen quer zur Strömungsrichtung der Fasersuspension erstrecken, wobei die stromaufwärts und die stromabwärts gelegenen Flanken der Rillen unterschiedliche Neigung bzw. Neigungswinkel haben,
dadurch gekennzeichnet, daß a) die nutenförmigen Rillen (2) bogenförmig mit stärkerer Krümmung (Breite B1) an der stromabwärts liegenden Flanke (4) und mit schwächerer Krümmung (Breite B2) an der stromaufwärts liegenden Flanke (5) ausgebildet sind, und b) die Sieböffnungen (6) in die Flanke mit schwächerer Krümmung münden, wobei B1 etwa gleich B2 bis etwa 4x B2 ist. 2. Cylindrical sieve basket for classifying fiber suspensions, the cylinder wall of which has continuous sieve openings which are assigned to a rotor on the outside and on the inside lead into groove-shaped grooves which are provided on the flow-side surface and extend essentially transversely to the direction of flow of the fiber suspension, the upstream and downstream flanks of the grooves have different inclinations and inclinations,
characterized in that a) the groove-shaped grooves (2) are arcuate with a greater curvature (width B1) on the downstream flank (4) and with a weaker curvature (width B2) on the upstream flank (5), and b) the screen openings (6) open into the flank with a weaker curvature, B1 being approximately equal to B2 to approximately 4x B2. 3. Siebkorb nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Übergangskanten der Rillen (2) in die Innenwand des zylindrischen Siebkorbes (1) gerundet sind.3. Screen basket according to claim 1 or 2, characterized in that the transition edges of the grooves (2) in the inner wall of the cylindrical screen basket (1) are rounded. 4. Siebkorb nach Anspruch 1, dadurch gekennzeichnet, daß die Gesamtbreite (B) der Rillen (2) aus den Teilbreiten (B1, B2) zusammengesetzt ist, wobei B1 etwa gleich 1/2 B2 bis 1/4 B2 ist.4. Sieve basket according to claim 1, characterized in that the total width (B) of the grooves (2) from the sections (B1, B2) is composed, wherein B1 is approximately equal to 1/2 B2 to 1/4 B2. 5. Siebkorb nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Tiefe t einer Rille (4) etwa gleich der Hälfte der Gesamtbreite (B) der Rille (4) ist.5. Sieve basket according to one of claims 1 to 4, characterized in that the depth t of a groove (4) is approximately equal to half the total width (B) of the groove (4).
EP90115652A 1989-08-17 1990-08-16 Screening cylinder Expired - Lifetime EP0414119B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3927202A DE3927202A1 (en) 1989-08-17 1989-08-17 CYLINDRICAL SIEVE BASKET
DE3927202 1989-08-17

Publications (2)

Publication Number Publication Date
EP0414119A1 true EP0414119A1 (en) 1991-02-27
EP0414119B1 EP0414119B1 (en) 2000-05-24

Family

ID=6387310

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90115652A Expired - Lifetime EP0414119B1 (en) 1989-08-17 1990-08-16 Screening cylinder

Country Status (5)

Country Link
US (1) US5073254A (en)
EP (1) EP0414119B1 (en)
AT (1) ATE193347T1 (en)
DE (2) DE3927202A1 (en)
ES (1) ES2145732T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993007334A1 (en) * 1991-10-04 1993-04-15 Cae Investments B.V. Method of manufacturing a screen product and a screen product manufactured by the method

Families Citing this family (20)

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Publication number Priority date Publication date Assignee Title
WO1991005911A1 (en) * 1989-10-23 1991-05-02 Beloit Corporation Basket profile for screens
CA2111147A1 (en) * 1993-12-13 1995-06-14 Jacques Riendeau Method of manufacturing a screen cylinder and a screen cylinder produced by the method
US5624558A (en) * 1994-08-04 1997-04-29 Cae Screenplates Inc. Method and apparatus for screening a fiber suspension
US5607589A (en) * 1995-06-06 1997-03-04 Cae Screenplates Inc. Multiple contour screening
FI100010B (en) * 1995-11-28 1997-08-15 Ahlstrom Machinery Oy Screen cylinder
DE19747653C2 (en) * 1997-10-29 2002-04-25 Voith Paper Patent Gmbh Sieve for fiber suspensions
DE19820675A1 (en) * 1998-05-08 1999-11-11 Fiedler Heinrich Gmbh Brewing mash lauter tun base zone filter has curved edges minimizing
JP3396456B2 (en) * 2000-02-04 2003-04-14 三菱重工業株式会社 Stock selection equipment
US7306176B1 (en) 2004-06-21 2007-12-11 Prince Industries, Inc. Compression assembly
JP4376151B2 (en) * 2004-08-09 2009-12-02 相川鉄工株式会社 Screen device
CN200954409Y (en) * 2006-06-27 2007-10-03 香港理工大学 Filters with better performance by reducing clogging
DE102009015405A1 (en) * 2009-03-27 2010-09-30 Voith Patent Gmbh scree
US10576502B2 (en) 2012-05-25 2020-03-03 Derrick Corporation Injection molded screening apparatuses and methods
US11161150B2 (en) 2012-05-25 2021-11-02 Derrick Corporation Injection molded screening apparatuses and methods
US9409209B2 (en) 2012-05-25 2016-08-09 Derrick Corporation Injection molded screening apparatuses and methods
JP6936467B2 (en) * 2017-03-16 2021-09-15 株式会社オプトニクス精密 Filter device
GB2575613A (en) 2017-04-28 2020-01-15 Derrick Corportion Thermoplastic compositions, methods, apparatus, and uses
US11505638B2 (en) 2017-04-28 2022-11-22 Derrick Corporation Thermoplastic compositions, methods, apparatus, and uses
BR112019025843A2 (en) 2017-06-06 2020-07-14 Derrick Corporation screening method and apparatus
US11213857B2 (en) 2017-06-06 2022-01-04 Derrick Corporation Method and apparatus for screening

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FR2539644A1 (en) * 1983-01-26 1984-07-27 Ahlstroem Oy FILTER PLATE, ESPECIALLY FOR THE PAPER INDUSTRY
WO1987003024A1 (en) * 1985-11-14 1987-05-21 Besam Ag Straining means
EP0236843A2 (en) * 1986-03-07 1987-09-16 J.M. Voith GmbH Sorting screen

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DE1140153B (en) * 1958-01-02 1962-11-22 Mannesmann Ag Filter pipe for pipe well
DE3013941A1 (en) * 1980-04-11 1981-10-29 J.M. Voith Gmbh, 7920 Heidenheim SIEVE BASKET
FR2498650B2 (en) * 1981-01-23 1986-03-21 Lamort E & M DEVICE FOR PURIFYING AND RECOVERING PULP
FR2516563A1 (en) * 1981-11-18 1983-05-20 Lamort E & M IMPROVEMENTS ON PAPER PULP CLEANERS AND THEIR SCREWS
FI862725A0 (en) * 1986-06-26 1986-06-26 Ahlstroem Oy SLITFAST HAOLPLATTA.
GB2195911A (en) * 1986-10-08 1988-04-20 Ingersoll Rand Co Screening apparatus for pulp

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
FR2539644A1 (en) * 1983-01-26 1984-07-27 Ahlstroem Oy FILTER PLATE, ESPECIALLY FOR THE PAPER INDUSTRY
WO1987003024A1 (en) * 1985-11-14 1987-05-21 Besam Ag Straining means
EP0236843A2 (en) * 1986-03-07 1987-09-16 J.M. Voith GmbH Sorting screen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993007334A1 (en) * 1991-10-04 1993-04-15 Cae Investments B.V. Method of manufacturing a screen product and a screen product manufactured by the method

Also Published As

Publication number Publication date
EP0414119B1 (en) 2000-05-24
ES2145732T3 (en) 2000-07-16
US5073254A (en) 1991-12-17
ATE193347T1 (en) 2000-06-15
DE59010906D1 (en) 2000-06-29
DE3927202A1 (en) 1991-02-21

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