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WO2022263093A1 - Ensemble barre profilée - Google Patents

Ensemble barre profilée Download PDF

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Publication number
WO2022263093A1
WO2022263093A1 PCT/EP2022/063554 EP2022063554W WO2022263093A1 WO 2022263093 A1 WO2022263093 A1 WO 2022263093A1 EP 2022063554 W EP2022063554 W EP 2022063554W WO 2022263093 A1 WO2022263093 A1 WO 2022263093A1
Authority
WO
WIPO (PCT)
Prior art keywords
flank
profile
angle
bar
head
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.)
Ceased
Application number
PCT/EP2022/063554
Other languages
German (de)
English (en)
Inventor
Michael Reinstein
Mari Toivola
Thomas Mickelat
Christoph Tichy
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.)
Andritz Fiedler GmbH
Original Assignee
Andritz Fiedler 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
Priority claimed from DE102022112037.6A external-priority patent/DE102022112037A1/de
Application filed by Andritz Fiedler GmbH filed Critical Andritz Fiedler GmbH
Publication of WO2022263093A1 publication Critical patent/WO2022263093A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/44—Edge filtering elements, i.e. using contiguous impervious surfaces
    • B01D29/445—Bar screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
    • B01D33/073—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for inward flow filtration
    • 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
    • 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
    • D21D5/06—Rotary screen-drums

Definitions

  • each profile bar comprises a profile bar foot and a profile bar head on the material feed side, which is swept over by a fibrous stock suspension as a material feed with a direction of flow.
  • a screen opening or a screen slot is formed between each two adjacent screen bars, which forms a flow connection to the accept side.
  • DE 199 16 038 A1 discloses a method for wet screening of fibrous stock suspensions in pressure screens and a pressure screen.
  • the profile rods are designed in such a way that the profile rod heads of adjacent profile rods, which are swept over by the fibrous suspension, overlap one another. Also, the screen opening or the respective screen slot formed between two adjacent screen bars has an inclined course counter to the direction of flow of the fibrous suspension.
  • a screen cylinder for cleaning or screening a fibrous stock suspension is known from EP 1 954 874 B1, the acceptance channel being arranged in its entirety in a direction which is directed opposite to the feed flow direction of the fibrous stock suspension. Screen openings or screen slits are thus formed here, which run at an angle to the direction of feed flow and are inclined counter to the direction of feed flow.
  • a screen cylinder for fibrous stock suspensions is known from US Pat. No. 6,119,867, in which the downstream flank of the profile rod head is designed in the form of a recess on the stock feed side, with a kink being obtained in the base of the profile.
  • a further screening device comprising a profile bar arrangement is known from US Pat. No. 4,846,971. 2
  • the invention aims to provide a profile bar arrangement in which the profile of each profile bar is designed in such a way that the pulp suspension is separated more effectively into rejects and accepts, at the same time a longer service life is achieved and there is a lower tendency to clogging.
  • a profile bar arrangement for this purpose, comprising a plurality of profile bars with a profile bar foot and a profile bar head on the stock feed side, which is swept over by a fibrous stock suspension as stock feed with a predetermined flow direction, and which is intended in particular for screening devices or for bar screening devices in the paper industry.
  • a screen opening with a flow connection to the accept side is formed between each two adjacent screen bars.
  • the profile bar arrangement is characterized by the combination of the features of claim 1.
  • the profile bar head is designed such that the upstream flank overlaps with a downstream flank of an adjacent screen bar, resulting in increased turbulence or vortex formation near the screen opening. As a result, the efficiency of the bar screening device can be improved when used as intended.
  • the downstream flank On the material feed side, the downstream flank has a recess which comprises a first feeding flank and a second outgoing flank.
  • An angle (a) is enclosed between the flanks and as a result, i.e. due to the V-shaped profile recess, an increased turbulence volume or increased vortex formation is obtained, as a result of which the effectiveness of the screening device can be increased.
  • the axis of the screen opening is arranged at an angle ⁇ to the tangent line of the flow direction of the stock supply. This results in an inclined course of the screen opening or of the screen slot formed between adjacent screen bars, which is inclined counter to the direction of flow of the fibrous stock suspension as the stock supply. This results in an increased backflow, which reduces the tendency to clog.
  • the angle (a) enclosed between the two flanks of the recess is in a range of 120° and 170°.
  • these features work together in such a way that a screening device, in particular - 3 - receives a bar screening device that has a significantly better overall range of services in terms of sorting efficiency and throughput.
  • the angle ⁇ enclosed between the two flanks of the recess is in a range of 140° and 160°.
  • the angle ( ⁇ ) for the inclination of the screen opening or the screen slot to the tangent line of the flow direction of the stock feed is in a range of about 30° and 90°, preferably about 45° and 60°.
  • the head-side flank of the profile bar has a tangential course which is essentially parallel to the direction of flow of the fibrous stock suspension as the stock supply and forms an essentially tangential wear surface.
  • the configuration of the profile bar is preferably such that the tangential wear surface of the screen bar head has an extension of approximately 0.4 mm to 1.5 mm, preferably approximately 0.5 mm to 1.2 mm.
  • the profile bar according to the invention is designed in such a way that the flanks of two adjacent screen bars downstream after the screen opening enclose an angle g to the acceptance side which is in a range of about 30° and 90°, preferably in a range of about 45° and 60° located.
  • an angle g to the acceptance side which is in a range of about 30° and 90°, preferably in a range of about 45° and 60° located.
  • the first feeding edge of the recess encloses an angle e of between about 0° and 10°, preferably about 2° and 6°, to the tangent line of the flow direction of the fibrous stock suspension as the stock supply.
  • the profile bar arrangement is preferably designed such that the second flank of the material feed-side recess encloses an angle ⁇ of between 5° and 60°, preferably between about 15° and 35°, to the tangent line of the direction of flow of the material feed.
  • Figure 1 shows a schematic perspective overall view of a bar screening device in the paper industry in the form of a bar screen basket
  • FIG. 2 shows a schematic perspective enlarged detail view of part of the bar screen basket according to FIG. 1, and
  • FIG. 3 shows a schematic side view in an enlarged representation of two adjacent profiled bars of the profiled bar arrangement to illustrate the essential angles of the profiling of the profiled bar according to the invention.
  • FIG. 1 shows a schematic perspective representation of a screen basket, designated overall by 1, which is a bar screening device in the paper industry, for example.
  • the screen basket 1 comprises two axially opposite end rings 2, between which two reinforcing rings 3 or support rings are arranged in the example shown, in which profile rods 4 are accommodated.
  • the profile bar 4 has a profile bar contour 5 which includes a profile bar foot 6 and a profile bar head 7 .
  • the respective profile rod head 7 is swept over by a fibrous stock suspension as stock supply in a flow direction F indicated in FIG.
  • a screen opening 9 is formed between each two adjacent profile bars 4 (see FIG. 3 for more details), which forms a flow connection to the accept side 10 of the screen basket 1 .
  • the two reinforcement rings 3 shown in FIG. 2 have recesses 8 into which the respective profile bar 4 is inserted with its profile bar foot 6 in a form-fitting manner.
  • the profile rod head 7 has a special profile design which is essential according to the invention, with the profiles of two adjacent profile rods 4 of the profile rod arrangement overlapping in the head region of the profile rod head 7 .
  • each profile bar head 7 is swept over by a fibrous stock suspension as a stock feed on the stock feed side.
  • the direction of flow of the fibrous stock suspension as stock feed is indicated by F.
  • Each profile bar head 7 is designed in such a way that an upstream flank 11 overlaps with a downstream flank of an adjacent profile bar 4 .
  • the downstream flank 12 of the profile rod head 7 is formed on the material feed side in the form of a recess 13 which comprises a first feeding flank 16 and a second leading flank 17 .
  • These two flanks 16, 17 of the recess 13 on the respective profile rod head 7 include one 6
  • the axis of the screen opening 9 encloses an angle ⁇ to the tangent line of the direction of flow F as the material supply.
  • the overlapping of the profiles of adjacent profile bars 4 at the profile bar head 7 intensifies turbulence, as a result of which the screening efficiency can be improved.
  • the recess 13, which is designed (V-shaped), causes an enlargement of the turbulence space, as a result of which the screening efficiency can be improved even further. Since the axis of the screen opening 9 preferably encloses an angle ß to the tangent line of the flow direction F, a flow direction directed against the flow direction F is obtained at and in the screen opening 9. This generates an increased backflow in the operating state, which reduces the tendency to clog in normal operation leaves.
  • Angle ⁇ is in a range of about 120° and 170°, and preferably in a range of about 140° and 160°.
  • the angle ⁇ for the inclined arrangement of the screen opening 9 is in a range of approximately 30° and 90°, preferably approximately 45° and 60°.
  • each profile bar 4 of the profile bar arrangement has a head-side flank 18 which has such a tangential course that it is essentially parallel to the direction of flow F of the material supply.
  • this head-side flank 18 forms a tangential wear surface which is abrasion-resistant and has a high wear resistance. This is intended to give the bar screening device a longer service life.
  • the flank 18 on the head side, which forms a substantially tangential wear surface preferably has an extent x of approximately 0.4 mm to 1.5 mm, preferably approximately 0.5 mm to 1.2 mm.
  • the downstream flanks 19, 20 of two adjacent profile bars 4 adjoining the screen opening 9 enclose an angle g in the direction of the acceptance side of the screening device and this angle is then in the range of about 30° and 90° °, preferably in a - 7 - ranging from about 45° and 60°. This ensures rapid opening of the passage through the sieve opening 9 in the direction of the acceptance side 10 in order to achieve a significant reduction in the flow resistance in this area in the direction of the acceptance side 10 .
  • the first feeding flank 16 encloses an angle e to the tangent line of the flow direction F of the material feed.
  • This angle e is in a range of approximately 0° and 10°, preferably in a range between approximately 2° and 6°.
  • the angle e gives the profile greater depth and maximizes swirl space.
  • this angle e gives the profile of the recess 13 an additional vortex component in the direction of the subsequent screen opening 9.
  • the second, leading edge 17 of the material feed-side recess 13 encloses an angle d to the tangent line of the flow direction F of the material feed. This angle is between about 5° and 60°, preferably between about 15° and 35°.
  • the special profiling that is essential according to the invention represents an overall combination of measures which interact in the form of a synergistic effect in such a way that a screening device is obtained which is designed in the form of a screen basket 1 and has an overall more favorable performance in the E operating state without possibly costly additional measures.
  • the increased formation of vortices in the area of the recess 13 is essential for improving the overall efficiency of the screening device.
  • the invention is not limited to the preceding preferred exemplary embodiments and their details, but numerous alterations and modifications are possible, which those skilled in the art will make if necessary without departing from the inventive idea, which is seen as providing a screening device overall, preferably a bar screening device - 8 len, which has significantly improved egg properties in the intended operational use and is also particularly wear-resistant.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un ensemble barre profilée comprenant de multiples barres profilées, chacune de ces barres comprenant un pied de barre profilée et une tête de barre profilée côté alimentation en matériau. Une suspension de matériau fibreux, en tant qu'amenée de matériau, passe au-dessus de la tête de barre profilée dans une direction d'écoulement spécifiée, et les barres profilées sont conçues en particulier pour des dispositifs de tamis à barres dans l'industrie du papier. Une ouverture de tamis, en particulier une fente de tamis, est formée entre chaque paire de barres profilées adjacentes, ladite ouverture de tamis formant une liaison d'écoulement avec le côté d'admission du dispositif de tamis. L'invention vise à améliorer globalement la capacité de sortie d'un tel dispositif de tamis à barres lors de son utilisation. À cet effet, la tête de barre profilée de l'ensemble barre profilée est conçue de sorte que le flanc amont chevauche le flanc aval d'une barre profilée adjacente. Le flanc aval sur la tête de barre profilée a la forme d'un évidement, par exemple un évidement en forme de V, côté alimentation en matière, ledit évidement comprenant un premier flanc d'alimentation et un second flanc d'évacuation. Les deux flancs forment un angle (a). En outre, l'axe de l'ouverture de filtre forme avec la ligne tangentielle de la direction d'écoulement de la suspension de matière fibreuse un angle (ß) avec la ligne tangentielle de la suspension de matériau fibreux. Des plages préférées pour les angles sont divulguées, et une surface d'usure tangentielle qui est sensiblement parallèle à la direction d'écoulement de l'alimentation en matériau est formée sur la tête de filtre à barres en particulier.
PCT/EP2022/063554 2021-06-15 2022-05-19 Ensemble barre profilée Ceased WO2022263093A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102021115472.3 2021-06-15
DE102021115472 2021-06-15
DE102022112037.6A DE102022112037A1 (de) 2021-06-15 2022-05-13 Profilstabanordnung
DE102022112037.6 2022-05-13

Publications (1)

Publication Number Publication Date
WO2022263093A1 true WO2022263093A1 (fr) 2022-12-22

Family

ID=82020030

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2022/063554 Ceased WO2022263093A1 (fr) 2021-06-15 2022-05-19 Ensemble barre profilée

Country Status (1)

Country Link
WO (1) WO2022263093A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4846971A (en) 1984-11-12 1989-07-11 E&M Lamort Sieves for scrubbers and their method of manufacture
US6119867A (en) 1995-11-28 2000-09-19 Ahlmstrom Machinery Oy Screen cylinder
DE19916038A1 (de) 1999-03-25 2000-09-28 Voith Sulzer Papiertech Patent Verfahren zum Nasssieben von Faserstoffsuspensionen in Drucksortierern und Drucksortierersieb
DE102010030084A1 (de) * 2010-06-15 2011-12-15 Voith Patent Gmbh Sieb
EP1954874B1 (fr) 2005-11-02 2015-02-25 Valmet Technologies, Inc. Cylindre de tamis

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4846971A (en) 1984-11-12 1989-07-11 E&M Lamort Sieves for scrubbers and their method of manufacture
US6119867A (en) 1995-11-28 2000-09-19 Ahlmstrom Machinery Oy Screen cylinder
DE19916038A1 (de) 1999-03-25 2000-09-28 Voith Sulzer Papiertech Patent Verfahren zum Nasssieben von Faserstoffsuspensionen in Drucksortierern und Drucksortierersieb
EP1954874B1 (fr) 2005-11-02 2015-02-25 Valmet Technologies, Inc. Cylindre de tamis
DE102010030084A1 (de) * 2010-06-15 2011-12-15 Voith Patent Gmbh Sieb

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