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EP3790669B1 - Dispositif de tamisage - Google Patents

Dispositif de tamisage Download PDF

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Publication number
EP3790669B1
EP3790669B1 EP19737660.1A EP19737660A EP3790669B1 EP 3790669 B1 EP3790669 B1 EP 3790669B1 EP 19737660 A EP19737660 A EP 19737660A EP 3790669 B1 EP3790669 B1 EP 3790669B1
Authority
EP
European Patent Office
Prior art keywords
bars
screening device
screen
profile
treatment area
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.)
Active
Application number
EP19737660.1A
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German (de)
English (en)
Other versions
EP3790669A1 (fr
Inventor
Michael Reinstein
Jürgen LEHMANN
Thomas Mickelat
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
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Filing date
Publication date
Application filed by Andritz Fiedler GmbH filed Critical Andritz Fiedler GmbH
Publication of EP3790669A1 publication Critical patent/EP3790669A1/fr
Application granted granted Critical
Publication of EP3790669B1 publication Critical patent/EP3790669B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/18—Drum screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/12—Apparatus having only parallel elements

Definitions

  • the invention relates to a screening device which is preferably designed in the form of a screening basket, wherein the screening device has screening slots or gaps formed between profiled screening bars, and the screening bars are received at their base area in receiving recesses of support elements adapted to the base area geometry and are permanently fastened to these.
  • screening devices are also referred to as "bar screening devices”. These screening devices can be designed in a flat form as screening plates or in a rounded form as screening baskets.
  • Profiled sieve bars and sieve devices are known, which are preferably designed in the form of a sieve basket. These devices have specially profiled sieve bars, in such a way that the respective radii upstream and downstream of the slot-generating flanks in the head area of the sieve bar have a common center.
  • the sieve device made from such sieve bars is cylindrical and can be divided into segments or areas in the axial direction, whereby the areas with different profile depths always have an essentially constant slot width.
  • the production of these specially designed sieve bars and their head area is complex, and Therefore, there is a need for a more cost-effective production of screening devices of this generic type.
  • a method for producing a screening device with controlled, uneven sorting slots as well as screening devices and their use are known. From this, the adjustability of the profile depth in a cylindrical rod screen basket is known.
  • the screen basket has variable slot widths and/or different profile depths, whereby both core sizes can always be varied.
  • a screening device preferably in the form of a screen basket with a cylindrical design, is made from these profile rods known from this.
  • the US 5,255,790 A discloses a screen basket for sorting/classifying, in particular fiber suspensions, consisting of parallel bars between which slot-shaped screen gaps are formed.
  • the end faces of the bars facing the entry side of the fiber suspension are inclined and provided with ribs or beads.
  • a screening device of the generic type having the features of the preamble of claim 1 is described in WO 2018/039719 A1 described.
  • the invention therefore aims to provide a screening device made of conventional screening bars, which for example have a triangular profile, in which the sorting efficiency is improved, a low tendency to clogging is available and higher throughput quantities can be achieved as well as an overall gentle sorting process can be realized.
  • a screening device in the form of a screening basket is provided with screening slots or gaps formed between profiled screening bars, in which the screening bars are triangular in profile and are received at their base area in receiving recesses of support elements adapted to the geometry of the base area and are permanently attached to these.
  • the screening device is divided in the flow direction, starting from a material inlet side to the reject outlet side, into at least a first treatment area A and a second treatment area B, with the diameter on the material inlet side being larger than on the reject outlet side.
  • the screening device is characterized in that the profile bars are arranged in such a way that, with a constant slot width between adjacent profile bars, the profile bars have a profile depth t1 in the first treatment area A and a profile depth t2 in the second treatment area B, wherein the profile depth t1 in the first treatment area A is smaller than the profile depth t2 in the second treatment area B, wherein the profile depth increases in steps starting from the material inlet side to the direct outlet side.
  • the screening device according to the invention is designed in such a way that there are different profile depths and/or different angles at a tangent to the screening device surface, but essentially a constant slot width is present, so that screening treatments or sorting treatments with different implementation conditions can be carried out in the direction of flow of the screening device from the material inlet side to the reject outlet side. This allows higher throughput quantities to be achieved and in particular improved sorting efficiency is achieved.
  • the sieve device according to the invention thus provides an overall more efficient and gentle sorting process.
  • the thickening of the fiber suspension increases steadily in the direction of the reject outlet side.
  • a greater profile depth is implemented in the area towards the reject outlet side. This increases the turbulence in this area, paper fibers in the suspension are better fluidized, and the tendency to blockage decreases.
  • the dirt load also thickens and concentrates. This dirt load increases wear, so that the greater profile depth in this area increases the volume of material in the flow, thereby improving the creep strength and increasing the service life of the profile or screen basket.
  • the screen bars can be aligned axially to the screen basket axis, or alternatively aligned linearly inclined to the screen axis. Or according to another preferred embodiment, the screen bars can be aligned discontinuously curved to the screen basket axis. The alignment of the screen bars is selected in accordance with and in accordance with the screening tasks and screening treatments.
  • the profile bars have a substantially triangular profile.
  • the slot width can be in a range from 0.05 mm to 0.8 mm, preferably from 0.1 mm to 0.4 mm.
  • the profile bar width is preferably in a range of 2.0 mm to 8 mm, and preferably between 2.0 mm and 4.0 mm.
  • Fig. 1 an embodiment of a screening device, designated overall with 1, is shown, which is divided in the flow direction from the material inlet side (inlet) to the reject outlet side (reject) into at least two different treatment areas A, B.
  • the inlet on the material inlet side 2 and the reject on the reject outlet side 3 are indicated by arrows.
  • the direction of the accept flow is also indicated with arrows in connection with the designation "accept”.
  • Fig. 1 On the right side of Fig. 1 In an enlarged detail view, the corresponding arrangement of profile bars 4 is shown next to the treatment areas A, B.
  • the profile bars 4 are arranged in such a way that, with a constant slot width w between adjacent profile bars 4 in the direction of the screen basket axis, the profile depth t increases from the material inlet side to the reject outlet side, and the diameter of the screening device 1 on the material inlet side 2 is larger than on the reject outlet side 3.
  • the screening device 1 according to the invention is thus designed conically in a predetermined manner, namely in such a way that the diameter of the material inlet side 2 is larger than on the reject outlet side 3.
  • the sieve bars 4' in the treatment area B have a profile head width B, a distance from profile bar 4' to profile bar 4' of P2, a profile bar head width b2, whereby the profile depth is indicated as t2.
  • the sieve bars 4 are arranged with a profile depth t1 in the treatment area A, and the profile bars 4' are arranged with a profile depth t2 in the treatment area B.
  • the slot width w is constant.
  • the profile depth t1 in the treatment area A is smaller than the profile depth t2 in the treatment area B, or in other words, the profile depth t increases from treatment area A, designated there as t1, to treatment area B at t2.
  • the diameter of the screening device 1 on the material inlet side (inlet) 2 is larger than on the reject outlet side 3 (reject).
  • Fig. 2 schematically illustrates a screening device 1 according to Figure 1 in conjunction with an internally rotating rotor 6, which is equipped with blades 7. Since the screening device 1 according to the invention is conical, Fig. 2 the gap between the wings 7 and the inner wall of the screening device 1 becomes smaller starting from the material inlet side 2 in the direction of the reject outlet side 3. This allows the sorting efficiency to be increased significantly.
  • FIG. 3 an alternative design is shown in which the screening device 1 works together with an internally running rotor 6', which is also equipped with blades 7'.
  • the design here is such that the rotor 6' is also conical like the screening device 1, such that starting from the material inlet side 2 in the direction of the reject outlet side 3, the diameter of the rotor 6' becomes smaller.
  • the blades 7' therefore also follow the conical design of the screening device 1.
  • the gap between the blades 7' of the rotor 6' and the inner wall of the conically designed screening device 1 therefore remains essentially approximately constant starting from the material inlet side 2 to the reject outlet side 3.
  • the profile bars 4, 4' are aligned axially to the screen basket axis 4 as a preferred embodiment of the screening device 1.
  • Fig. 5 the profile bars 4, 4' serving as sieve bars are aligned linearly inclined at an angle ⁇ to the sieve basket axis as a preferred embodiment of the sieve device 1.
  • the profile bars 4, 4' are discontinuously curved to the screen basket axis as a preferred embodiment of the screening device 1.
  • the profile bars 4, 4' are arranged in such a way that they are assigned to the corresponding treatment area that, with constant slot widths w between adjacent profile bars 4, 4' in the direction of the screen basket axis, the profile depth t1, t2 increases from the material inlet side 2 to the reject outlet side 3, and the diameter of the screening device 1 on the material inlet side 2 is larger than on the reject outlet side 7, so that a conical design of the screening device 1 according to the invention is obtained.
  • This allows the screening device 1 to be adapted in the flow direction to the respective requirements, circumstances and treatment conditions and to be coordinated with them in a targeted manner.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Combined Means For Separation Of Solids (AREA)

Claims (6)

  1. Dispositif de tamisage (1) sous forme d'un panier de tamisage, comprenant des fentes ou interstices de tamisage formées entre des barres de tamisage (4, 4'), dans lequel les barres de tamisage (4, 4') sont en forme de triangle dans le profil et sont reçues sur leur zone de pied dans des évidements de réception d'éléments porteurs adaptés à la géométrie de zone de pied et fixées en permanence sur ceux-ci, dans lequel le dispositif de tamisage (1) est subdivisé dans la direction d'écoulement à partir d'une face d'entrée de matière (2) vers la face de sortie de rejet (3) en au moins une première zone de traitement (A) et une deuxième zone de traitement (B), et le diamètre du dispositif de tamisage (1) sur la face d'entrée de matière (2) est plus grand que sur la face de sortie de rejet (3), caractérisé en ce que les barres profilées (4, 4') sont disposées de telle sorte que lorsque la largeur de fente (w) entre des barres de tamisage (4, 4') voisines dans la première zone de traitement (A) est constante, les barres profilées (4) possèdent une profondeur de profil (t1) et, dans la deuxième zone de traitement (B), une profondeur de profil (t2), dans lequel la profondeur de profil (t1) dans la première zone de traitement (A) est inférieure à la profondeur de profil (t2) dans la deuxième zone de traitement (B), dans lequel la profondeur de profil (t1, t2) augmente en gradins à partir de la face d'entrée de matière (2) vers la face de sortie de rejet (3).
  2. Dispositif de tamisage (1) selon la revendication 1, caractérisé en ce que les barres de tamisage (4, 4') sont orientées axialement par rapport à l'axe de panier de tamisage.
  3. Dispositif de tamisage (1) selon la revendication 1, caractérisé en ce que les barres de tamisage (4, 4') sont réalisées de manière inclinée linéairement par rapport à l'axe de panier de tamisage.
  4. Dispositif de tamisage (1) selon la revendication 1, caractérisé en ce que les barres de tamisage (4, 4') sont orientées de manière courbée de façon discontinue par rapport à l'axe de panier de tamisage.
  5. Dispositif de tamisage (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que la largeur de fente (w) se situe dans une plage de 0,05 mm à 0,8 mm, de préférence 0,1 à 0,4 mm.
  6. Dispositif de tamisage (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que la largeur de barre profilée (b1, b2) se situe dans une plage de 2,0 mm à 8 mm, de préférence 2,0 mm à 4,0 mm.
EP19737660.1A 2018-07-04 2019-07-01 Dispositif de tamisage Active EP3790669B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018005307.6A DE102018005307B3 (de) 2018-07-04 2018-07-04 Siebvorrichtung
PCT/EP2019/000199 WO2020007499A1 (fr) 2018-07-04 2019-07-01 Dispositif de tamisage

Publications (2)

Publication Number Publication Date
EP3790669A1 EP3790669A1 (fr) 2021-03-17
EP3790669B1 true EP3790669B1 (fr) 2025-01-29

Family

ID=66547966

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19737660.1A Active EP3790669B1 (fr) 2018-07-04 2019-07-01 Dispositif de tamisage

Country Status (6)

Country Link
EP (1) EP3790669B1 (fr)
KR (1) KR102479630B1 (fr)
CN (1) CN112703064A (fr)
CA (1) CA3096277A1 (fr)
DE (1) DE102018005307B3 (fr)
WO (1) WO2020007499A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3491888A (en) * 1968-12-27 1970-01-27 Universal Oil Prod Co Self-cleaning screen baskets
DE4104615A1 (de) * 1991-02-15 1992-08-20 Voith Gmbh J M Siebkorb
DE4121897A1 (de) * 1991-07-02 1993-01-07 Fiedler Heinrich Gmbh Siebelement
DE4432842C2 (de) 1994-09-15 1996-09-26 Voith Sulzer Stoffaufbereitung Verfahren zum Ausbringen unerwünschter Feststoffpartikel aus einer wässerigen Faserstoffsuspension sowie Vorrichtung zu seiner Ausführung
DE19609316C2 (de) 1996-03-09 2002-04-18 Voith Sulzer Stoffaufbereitung Verfahren zur Herstellung einer Siebvorrichtung mit kontrolliert ungleichmäßigen Sortierschlitzen sowie Siebvorrichtung und deren Verwendung
DE102007015901B4 (de) * 2007-04-02 2023-07-20 Andritz Fiedler Gmbh Siebvorrichtung
DE102014011679A1 (de) * 2013-08-20 2015-02-26 Andritz Fiedler Gmbh Profilierter Siebstab und Siebvorrichtung aus profilierten Siebstäben
WO2018039719A1 (fr) * 2016-08-30 2018-03-08 Schmacker Investments Pty Ltd Élément de fil métallique et procédé de fabrication de fil métallique

Also Published As

Publication number Publication date
KR102479630B1 (ko) 2022-12-21
CN112703064A (zh) 2021-04-23
CA3096277A1 (fr) 2020-01-09
DE102018005307B3 (de) 2019-06-06
KR20200136989A (ko) 2020-12-08
WO2020007499A1 (fr) 2020-01-09
EP3790669A1 (fr) 2021-03-17

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