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EP0807709B1 - Dispositif pour l'épuration d'une suspension fibreuse - Google Patents

Dispositif pour l'épuration d'une suspension fibreuse Download PDF

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Publication number
EP0807709B1
EP0807709B1 EP97104828A EP97104828A EP0807709B1 EP 0807709 B1 EP0807709 B1 EP 0807709B1 EP 97104828 A EP97104828 A EP 97104828A EP 97104828 A EP97104828 A EP 97104828A EP 0807709 B1 EP0807709 B1 EP 0807709B1
Authority
EP
European Patent Office
Prior art keywords
cross
section
sorting
inflow
sieve element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97104828A
Other languages
German (de)
English (en)
Other versions
EP0807709A1 (fr
Inventor
Manfred Duchow
Peter Schweiss
Hans Friedrich
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 Paper Fiber and Environmental Solutions GmbH and Co KG
Original Assignee
Voith Sulzer Stoffaufbereitung GmbH
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
Application filed by Voith Sulzer Stoffaufbereitung GmbH filed Critical Voith Sulzer Stoffaufbereitung GmbH
Publication of EP0807709A1 publication Critical patent/EP0807709A1/fr
Application granted granted Critical
Publication of EP0807709B1 publication Critical patent/EP0807709B1/fr
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
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils
    • 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
    • D21D5/04—Flat screens
    • 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 device for sorting fibrous material Suspension with a sieve element containing a plurality of sorting openings.
  • Sorting devices are known to be used in the pulp and paper industry used, in which the fibrous suspension treated in a kind of wet screening becomes. In most cases, impurities that are foreign to fibers should be due to their Size retained on the screen element and then separated. The fibers can pass through the sorting openings together with some of the water. In principle, such machines are widely known and are often used.
  • EP 0 119 345 A describes a sorting device with a cylindrical one Sieve element, so-called a sieve basket, which is known on the inlet side strip-shaped surveys is provided and also on the inlet side is available for this movable clearing element.
  • the sieve element contains a large number round sorting openings, the narrowest cross-section of which is the sorting cross-section determines the sorting characteristics.
  • the US 4,276,159 also deals with screening devices, their screening element is cylindrical.
  • the sorting openings have one in Flow direction seen, narrowing cross-sectional profile. This The necking area is relatively long and acute-angled.
  • Sorting openings are round and chamfered on the inlet side so that, in Flow direction seen, the cross section initially narrowed.
  • the strips placed on such screens are usually intended to pre-screen the screen Protect wear. They are therefore often made of particularly wear-resistant material Material, e.g. Carbide, manufactured. In addition to the wear-reducing effect you can also improve the function of the sorting device. Because one Sorting device has at least one clearing element, e.g. is designed as a wing and is moved relatively close to the sorting element can by the Relative movement additional vortices are generated that keep the free Sort opening favors. In the case of fibrous material containing specks, through Interaction of clearing element and bar a very desirable Resolution of the specks can be achieved. In addition, the strips can be attached be that together with the clearing element a deflection of the at the sorting opening cause rejected substances towards the outlet from the sorting device.
  • the sieve element in the sorting device disk-shaped, that is to say flat, sieve element is present on the inlet side strip-shaped surveys is provided and at least one on its inlet side is present relative to this movable clearing element, the sieve element Contains a large number of round sorting openings, the narrowest cross section of which Sorting cross-section is, and on the inlet side an expanded inlet cross-section have a size at least 1.4 times the cross section of the Sort opening is.
  • Fig. 1 is the part of the invention essential to the invention Sorting device shown.
  • the sieve element 1 drawn in section, which contains a number of sorting openings 2.
  • sorting openings 2 There are two examples different configurations of such sorting openings are drawn, in reality the same holes are usually used for one and the same screen element.
  • the illustration is chosen so that the inlet side 4 is at the top, ie the suspension from above to be guided down through the sorting openings 2. Basically, however any position possible.
  • On the inlet side 4 there are three strip-like elevations 5 drawn.
  • a clearing element 3 is moved relative to the sieve element 1. Doing so Usually the sieve element 1 is permanently installed and the clearing element 3 e.g.
  • the clearing element has on its underside 8, which is the sieve element is facing, different distances to the inlet side 4 of the screen element 1.
  • the primary distance a is smaller than the secondary distance behind Distance b.
  • This useful embodiment of the invention can keep the Favor sorting openings 2, since it generates suction impulses.
  • This also gives the Clearing wing just at the point a bead-like reinforcement that is particularly high is claimed.
  • the broaching element 3 has the extension c, which in particularly favorable versions is at least 8 times as long as the secondary distance b. This creates an extensive suction zone under the Clearing element that is useful for keeping the sieve clear.
  • the sorting openings 2 have 4 on the inlet side an inlet cross-section 6 that is larger than the actual sorting cross-section 7.
  • the sorting cross section 7 is known to be the narrowest point of a sorting opening and decisively determines the separation characteristics of the device. Which varied somewhat, Sort openings on the right have turn to the outlet side Extensions. This agent, known per se, is intended to further increase the tendency to constipation to reduce.
  • Fig. 2 the device of Fig. 1 is outlined in supervision.
  • the main thing is the arrangement of the sorting openings 2 and the strip-shaped elevations 5.
  • the arrangement and orientation of these strip-shaped elevations relative to Direction of movement of the rotor can be chosen so that pushing away rejected substances on the strips is favored by the rotor movement.
  • FIG. 3 schematically shows the conditions in the area of the sorting openings 2 a little more detailed.
  • a sorting opening 2 is shown on the left so that the Inlet cross section 6 and the sorting cross section 7 are visible.
  • the measure of Height h indicated with which the strip-shaped elevations 5 above the inlet side 4 of the Sieve element 1 survives. The transition from the inlet cross section 6 to the downstream located narrower cross section, as shown here, in the gradual course of the depth t done.
  • the suspension S enters the sorting housing 9 through the inlet connection 10.
  • the housing is divided by the sieve element 1 into two unequal chambers.
  • the clearing element 3 is in the form of a drivable wing rotor moved so close to the screen element 1 that Clogging of the sorting openings 2 can be prevented.
  • the one on the sieve element 1 Rejected is derived through the outlet nozzle 11 and the accept that the screen could happen through the Gutstoffstutzen 12.
  • the embodiment shown here contains a vertical sieve plate in the form of the Sieve element 1, but other arrangements are possible, e.g. can the sieve element 1 be designed as a horizontal plate; it is also conceivable that further sieve elements are in the same housing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Claims (13)

  1. Dispositif pour épurer une suspension aqueuse (S) contenant une matière fibreuse, à l'aide d'un élément de criblage (1) en forme de disque, qui est pourvu, sur le côté arrivée (4), de reliefs (5) en forme de baguettes et sur le côté arrivée (4) duquel se trouve au moins un élément de dégagement (3), déplaçable par rapport à cet élément de criblage, l'élément de criblage (1) contenant un grand nombre d'ouvertures de tri (2) circulaires, dont la section la plus étroite est la section de tri (7), et qui, sur le côté arrivée (4), présentent une section d'arrivée (6) élargie dont la dimension est égale à au moins 1,4 fois la section de tri (7) de l'orifice de tri (2).
  2. Dispositif selon la revendication 1, caractérisé en ce que la section d'arrivée (6) élargie passe progressivement dans la section plus étroite suivante en aval, qui à son tour est constante vers l'aval ou s'élargit à nouveau.
  3. Dispositif selon la revendication 2, caractérisé en ce que la transition entre la section d'arrivée (6) élargie et la section plus étroite suivante en aval, se produit à une profondeur (t) d'au moins 1 mm.
  4. Dispositif selon la revendication 2 ou 3, caractérisé en ce que la transition entre la section d'arrivée (6) élargie et la section plus étroite suivante en aval, se produit suivant une inclinaison de 45°.
  5. Dispositif selon la revendication 2, 3 ou 4, caractérisé en ce que la section plus étroite suivante en aval est la section de tri (7).
  6. Dispositif selon l'une des revendications précédentes, caractérisé en ce que les sections d'arrivée (6) élargies sont biseautées.
  7. Dispositif selon l'une des revendications précédentes, caractérisé en ce que les reliefs (5) en forme de baguettes présentent une hauteur (h) d'au moins 2 mm au-dessus de la surface de criblage.
  8. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la face inférieure (8) de l'élément de dégagement (3), tournée vers le côté arrivée (4), présente un contour pour lequel la distance primaire (a) entre la face inférieure (8) et le côté arrivée (4) à l'avant, vu dans le sens de déplacement, est inférieure à la distance secondaire (b) à l'arrière.
  9. Dispositif selon la revendication 8, caractérisé en ce que l'étendue (c) de l'élément de dégagement (3) dans le sens de déplacement est au moins égale à 8 fois la distance secondaire (b).
  10. Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'élément de dégagement (3) ou les éléments de dégagement (3) font partie d'un rotor disposé coaxialement à l'élément de criblage (1).
  11. Dispositif selon la revendication 10, caractérisé en ce que l'élément de dégagement (3) comporte des pales dont les bords avant, lorsqu'on observe l'élément de criblage (1), sont incurvés de manière que des zones des bords avant, situées radialement plus loin vers l'extérieur ont, par rapport au rayon, un angle plus obtus que des zones situées plus loin à l'intérieur.
  12. Dispositif selon la revendication 10, caractérisé en ce que les reliefs (5) en forme de baguettes sont orientés suivant un angle de -15° à +15° par rapport au rayon de l'élément de criblage (1).
  13. Dispositif selon l'une des revendications précédentes, caractérisé en ce que les reliefs (5) en forme de baguettes sont des passes de soudure.
EP97104828A 1996-05-18 1997-03-21 Dispositif pour l'épuration d'une suspension fibreuse Expired - Lifetime EP0807709B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19620051A DE19620051A1 (de) 1996-05-18 1996-05-18 Vorrichtung zum Sortieren von faserstoffhaltiger Suspension
DE19620051 1996-05-18

Publications (2)

Publication Number Publication Date
EP0807709A1 EP0807709A1 (fr) 1997-11-19
EP0807709B1 true EP0807709B1 (fr) 2001-11-21

Family

ID=7794658

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97104828A Expired - Lifetime EP0807709B1 (fr) 1996-05-18 1997-03-21 Dispositif pour l'épuration d'une suspension fibreuse

Country Status (2)

Country Link
EP (1) EP0807709B1 (fr)
DE (2) DE19620051A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19747653C2 (de) * 1997-10-29 2002-04-25 Voith Paper Patent Gmbh Sieb für Faserstoffsuspensionen
DE10065931A1 (de) * 2000-12-22 2002-06-27 Voith Paper Patent Gmbh Verfahren zur Herstellung von bei der Nasssiebung von Papierfasersuspensionen verwendbaren Sieben
DE102009015405A1 (de) * 2009-03-27 2010-09-30 Voith Patent Gmbh Sieb
DE102012213642A1 (de) * 2012-08-02 2014-02-06 Voith Patent Gmbh Siebvorrichtung

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR828473A (fr) * 1937-01-28 1938-05-18 Pressoirs Mabille Perfectionnements aux pressoirs continus ou similaires
DE2226050A1 (de) * 1972-05-29 1973-12-13 Voith Gmbh J M Vorrichtung zum stetigen ausscheiden von grobstoff aus faserstoffaufschwemmungen
DE3010952A1 (de) * 1980-03-21 1981-10-08 J.M. Voith Gmbh, 7920 Heidenheim Scheibensortierer zum reinigen von faserstoffsuspensionen
US4276159A (en) * 1980-06-19 1981-06-30 The Black Clawson Company Apparatus for screening paper fiber stock
DE3368957D1 (en) * 1983-01-21 1987-02-12 Black Clawson Co Screening apparatus for paper making stock
FR2572950B1 (fr) * 1984-11-12 1987-01-23 Lamort E & M Perfectionnements aux tamis pour epurateurs et a leur mode de fabrication
JPS61174489A (ja) * 1985-01-28 1986-08-06 株式会社　サトミ製作所 高濃度パルプスクリ−ン
CA1288733C (fr) * 1985-09-05 1991-09-10 The Black Clawson Company Dispositif tamiseur de pates papetieres de fibres
US4795560A (en) * 1987-04-16 1989-01-03 The Black Clawson Company Screen plates
DE4324662A1 (de) * 1993-07-22 1995-01-26 Voith Gmbh J M Sieb

Also Published As

Publication number Publication date
DE19620051A1 (de) 1997-11-20
DE59705439D1 (de) 2002-01-03
EP0807709A1 (fr) 1997-11-19

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