EP3723916B1 - Tamis cylindrique - Google Patents

Tamis cylindrique Download PDF

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Publication number
EP3723916B1
EP3723916B1 EP18789112.2A EP18789112A EP3723916B1 EP 3723916 B1 EP3723916 B1 EP 3723916B1 EP 18789112 A EP18789112 A EP 18789112A EP 3723916 B1 EP3723916 B1 EP 3723916B1
Authority
EP
European Patent Office
Prior art keywords
bar
recesses
profiled
holders
bars
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
EP18789112.2A
Other languages
German (de)
English (en)
Other versions
EP3723916A1 (fr
Inventor
Werner Brettschneider
Ingo Kauer
Melanie Schädler
Ralf Burger
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 Patent GmbH
Original Assignee
Voith Patent GmbH
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Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP3723916A1 publication Critical patent/EP3723916A1/fr
Application granted granted Critical
Publication of EP3723916B1 publication Critical patent/EP3723916B1/fr
Active legal-status Critical Current
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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
    • 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
    • B07B1/4618—Manufacturing of screening surfaces
    • 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 method for producing a cylindrical screening device with a large number of profiled bars, in which a plurality of ring-shaped bar holders which run perpendicular to the cylinder axis and are spaced apart from one another are provided on the inside or outside with open-edged recesses, the shape of which is essentially complementary to the bar feet of the profiled bars and which are slightly larger than the rod feet and in which the profile rods are inserted into the recesses parallel to one another and parallel to the cylinder axis.
  • cylindrical screening devices that can be produced by the method of this type is the screening of fibrous suspensions, as is carried out in pressure screens in the paper-making industry.
  • the fibers contained in the suspension should pass through the screen, while the unwanted solid components are rejected at the gap and guided out of the screening device again.
  • openings have an essentially oblong shape, i.e. slots or gaps, fibrous particles can pass through more easily than cubic ones, even if both types should be of a similar size.
  • a possible method to produce such screen baskets shows the DE 10 2006 007 660 A1 , in which the profile bars are clamped by plastic deformation of the c-shaped retaining rings provided with depressions for the bars.
  • profile rods are used for such manufacturing processes.
  • the method is used on strainer baskets where the bars are inserted on the inside rim of the retaining rings. Such an arrangement of the rods is chosen when the suspension is to pass through the slots from the inside to the outside (centrifugal mode of operation).
  • bending forces are introduced from the outside at the butt ends, with the butt ends being supported on support rollers on the inside.
  • the radius of curvature of the retaining rings is increased.
  • the DE 10 2013 224528 B3 describes a solution in which the rods are used on the inner edge of the retaining rings and are fixed by forces acting radially from the outside on the retaining rings.
  • the object of the invention is to reduce the production costs while improving the strength and increasing the service life of the screening device.
  • the object was achieved in that at least two of the recesses assigned to a profile bar differ from one another in terms of their shape in such a way that there is a slight offset between them of the corresponding contact surface with the profile bar.
  • the profile bars jam in these recesses.
  • the offset is so small that it is still possible for the profile bars to be pushed in axially or pressed radially into these recesses.
  • the result is a stable construction of the cylindrical screen basket and a stable position of the bar holders, so that further fixing of the profile bars in the recesses is usually not necessary.
  • the offset is particularly effective with more than two rod holders if the direction of the offset is alternately reversed when viewed in the axial direction.
  • the different recesses can be efficiently cut out of the rod holders by means of laser, wire, water jet cutting or the like.
  • the rod holder Since the rod holder is already in the form of a ring and is generally designed in one piece, manufacture is simplified considerably. In addition to an exact cylindrical shape, this results in a high degree of accuracy in the recesses and thus also in the screen openings.
  • Laser cutting or wire EDM results in slight deviations in shape, so that a particularly simple manufacturing process consists in cutting out the recesses using a laser or eroding wire traveling along the inside or outside of the respective rod holder and starting the cut of at least two rod holders of the screen cylinder offset to one another is arranged.
  • the radial force is applied directly to the rod holders.
  • the radial force acts on the profile rods and, via these, indirectly on the rod holders.
  • the inside of the same should not be exposed to any supporting or bending forces during the radial force effect.
  • Production is particularly simple if the radial force is applied via a plurality of stamps acting radially from the outside.
  • stamps should preferably be distributed at equal distances over the circumference of the screen cylinder.
  • the pressing surface of the stamp pointing in the pressing direction, ie toward the central axis of the screening device should be concave, with this pressing surface advantageously being formed perpendicularly to the cylinder axis by a circular section whose radius corresponds to the outer radius of the finished, cylindrical screening device. This makes it possible to distribute the forces increasingly more evenly on the radial outside of the rod holders during pressing. In addition to an even change in shape, this protects the rod holders.
  • the stamps should be guided in a radially movable manner and/or fixed axially to the cylinder axis, at least during the radial action of force.
  • the rod holders 3 are produced here as one-piece rings by means of laser cutting, for example, with the diameter being slightly larger than that of the final screen basket. This is the basis for a high dimensional accuracy of the screen basket.
  • the screen basket prefabricated in this way consists of profile bars 1 running parallel to the cylinder axis 2 , which are held by a plurality of bar holders 3 which are spaced apart axially and run perpendicularly to the cylinder axis 2 .
  • the screen openings of the screen basket are formed by the slots of adjacent profile bars 1.
  • slits often have a width between 0.05 and 2 mm.
  • the respective axially adjacent recesses 4 of a profile bar 1 differ from each other in terms of their shape in such a way that there is a slight offset of the corresponding contact surface 6 with the profile bar 1 in Circumferential direction 7 results. Although this makes it somewhat more difficult to insert the profiled bars 1 into the recesses 4, it simplifies the fixing of the profiled bars 1 considerably.
  • the offset can be deliberately generated by means of the laser.
  • a permanent form fit between the profiled bars 1 and the recesses 4 can be produced by means of forces acting radially from the outside.
  • Figure 2b shows the other case, in which the recesses 4 are present on the outside of the rod holder and the radial force acts on the profile rods 1 and thus only indirectly on the rod holder 3.
  • the radial force is in accordance with the figures 2a +b realized via several punches 5 distributed radially evenly over the cylinder circumference, which are directed radially from the outside onto the rod holder 3 or profile rods 1 and in particular onto the cylinder axis 2 of the screen basket.
  • the pressing surface of all stamps 5 pointing in the pressing direction is formed by a circular segment whose radius corresponds to the outer radius of the screening device after the pressing process. Since the outer radius of the screening device formed by the bar holders 3 or profiled bars 1 is slightly larger before the pressing process than afterwards, there is a small amount of play between the bar holders 3 or profiled bars 1 and the pressing surface in the middle part of the punch 5 at the beginning of the pressing process. This play can be accepted at the beginning of pressing and the associated lower pressing forces and decreases as pressing progresses.
  • the stamps 5 are guided axially and radially in guide grooves.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Glass Compositions (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Photoreceptors In Electrophotography (AREA)

Claims (9)

  1. Procédé de fabrication d'un dispositif de tamisage cylindrique avec une pluralité de barres profilées (1), dans lequel plusieurs supports de barre (3) de forme annulaire, s'étendant perpendiculairement à l'axe du cylindre (2) et espacés les uns des autres, sont pourvus d'évidements (4) ouverts sur le bord sur le côté intérieur ou extérieur, dont la forme correspond essentiellement de manière complémentaire aux pieds de barre des barres profilées (1) et qui sont légèrement plus grands que les pieds de barre, et dans lequel les barres profilées (1) sont insérées parallèlement les unes aux autres et parallèlement à l'axe du cylindre (2) dans les évidements (4), les évidements (4) étant découpés au moyen d'une découpe au laser, d'une électroérosion à fil ou analogue sur le côté intérieur ou extérieur du support de barre (3) respectif, caractérisé en ce que le début de la coupe d'au moins deux supports de barre (3) du cylindre de tamisage est agencé de manière décalée l'un par rapport à l'autre, de telle sorte qu'au moins deux des évidements (4) associés respectivement à une barre profilée (1) se distinguent l'un de l'autre au regard de leur forme, de telle sorte qu'un léger décalage de la surface de contact (6) correspondante avec la barre profilée (1) en résulte entre eux.
  2. Procédé selon la revendication 1, caractérisé en ce que le début de la coupe des supports de barre (3) respectivement voisins du cylindre de tamisage est agencé de manière décalée l'un par rapport à l'autre, de telle sorte que les évidements (4) respectivement voisins axialement d'une barre profilée (1) se distinguent les uns des autres au regard de leur forme de telle sorte qu'un léger décalage de la surface de contact (6) correspondante avec la barre profilée (1) en résulte entre eux.
  3. Procédé de fabrication d'un dispositif de tamisage cylindrique selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une liaison de forme durable entre les barres profilées (1) et les évidements (4) est produite par des forces agissant radialement de l'extérieur.
  4. Procédé selon la revendication 3, caractérisé en ce que le côté intérieur des supports de barre (3) n'est pas soumis à des forces de support ou de flexion pendant l'action de la force radiale.
  5. Procédé selon la revendication 3 ou 4, caractérisé en ce que l'action de la force radiale est exercée par le biais de plusieurs poinçons (5) agissant radialement de l'extérieur.
  6. Procédé selon la revendication 5, caractérisé en ce que les poinçons (5) sont agencés de manière répartie de préférence à égale distance sur la circonférence du cylindre de tamisage.
  7. Procédé selon l'une quelconque des revendications 3 à 6, caractérisé en ce que les évidements (4) ne sont présents que sur le côté intérieur des supports de barre (3) et l'action de la force radiale s'effectue sur les supports de barre (3).
  8. Procédé selon l'une quelconque des revendications 3 à 6, caractérisé en ce que les évidements (4) ne sont présents que sur le côté extérieur des supports de barre (3) et l'action de la force radiale s'effectue sur les barres profilées (1).
  9. Procédé selon l'une quelconque des revendications 5 à 8, caractérisé en ce que la surface de pressage des poinçons (5), orientée dans la direction de pressage, est formée perpendiculairement à l'axe du cylindre (2) par un segment de cercle dont le rayon correspond au rayon extérieur du dispositif de tamisage fini.
EP18789112.2A 2017-12-13 2018-10-17 Tamis cylindrique Active EP3723916B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017129765.0A DE102017129765B3 (de) 2017-12-13 2017-12-13 Siebzylinder
PCT/EP2018/078316 WO2019115060A1 (fr) 2017-12-13 2018-10-17 Tamis à tambour

Publications (2)

Publication Number Publication Date
EP3723916A1 EP3723916A1 (fr) 2020-10-21
EP3723916B1 true EP3723916B1 (fr) 2022-12-07

Family

ID=63372293

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18789112.2A Active EP3723916B1 (fr) 2017-12-13 2018-10-17 Tamis cylindrique

Country Status (4)

Country Link
EP (1) EP3723916B1 (fr)
DE (1) DE102017129765B3 (fr)
FI (1) FI3723916T3 (fr)
WO (1) WO2019115060A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019107261B3 (de) * 2019-03-21 2020-03-26 Voith Patent Gmbh Siebherstellverfahren
DE102019107693A1 (de) * 2019-03-26 2020-10-01 Voith Patent Gmbh Drucksortierer

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4435538C2 (de) 1994-10-05 1996-10-02 Voith Gmbh J M Verfahren zur Herstellung eines Flachsiebes
US6131743A (en) * 1997-06-18 2000-10-17 Hermann Finckh Maschinenfabrik Gmbh & Co. Screen basket for fiber suspensions and method for the production thereof
DE102006007660A1 (de) 2006-02-22 2007-08-23 Voith Patent Gmbh Verfahren zur Herstellung einer rotations-symmetrischen, insbesondere zylindrischen Siebvorrichtung
DE102013224528B3 (de) * 2013-11-29 2014-07-24 Voith Patent Gmbh Siebherstellverfahren

Also Published As

Publication number Publication date
EP3723916A1 (fr) 2020-10-21
DE102017129765B3 (de) 2018-09-20
WO2019115060A1 (fr) 2019-06-20
FI3723916T3 (fi) 2023-03-20

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