WO2020193003A1 - Trieur sous pression, élément de tamisage et procédé pour la fabrication d'un élément de tamisage - Google Patents

Trieur sous pression, élément de tamisage et procédé pour la fabrication d'un élément de tamisage Download PDF

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Publication number
WO2020193003A1
WO2020193003A1 PCT/EP2020/053864 EP2020053864W WO2020193003A1 WO 2020193003 A1 WO2020193003 A1 WO 2020193003A1 EP 2020053864 W EP2020053864 W EP 2020053864W WO 2020193003 A1 WO2020193003 A1 WO 2020193003A1
Authority
WO
WIPO (PCT)
Prior art keywords
sieve
rotor
sieve element
pressure sorter
axis
Prior art date
Application number
PCT/EP2020/053864
Other languages
German (de)
English (en)
Inventor
Werner Brettschneider
Ingo Kauer
Melanie Schädler
Ralf Burger
Original Assignee
Voith Patent 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 Patent Gmbh filed Critical Voith Patent Gmbh
Publication of WO2020193003A1 publication Critical patent/WO2020193003A1/fr

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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
    • D21D5/16—Cylinders and plates for screens

Definitions

  • the invention relates to a pressure sorter for cleaning a pulp suspension with a sieve element which is rotationally symmetrical about a sieve axis and which divides the pressure sorter into an inlet space and an accepts space, the inlet space at one axial end with a suspension inlet and at the opposite axial end with a reject outlet and the accepts space is in connection with an accept drain and there is a rotor with rotor blades in the inlet chamber, the axis of rotation of which corresponds to the sieve axis and which rotates relative to the sieve element.
  • the invention also relates to a rotationally symmetrical screen element with a large number of profile bars, in which a plurality of ring-shaped bar holders, which run perpendicular to the screen axis and are spaced apart, are provided on the inside or outside with open-edged recesses, the shape of which corresponds essentially to the bar feet of the profile bars and which are slightly larger than the rod feet and in which the profile rods are inserted into the recesses essentially parallel to one another and essentially parallel to the sieve axis, as well as their lowering position.
  • Pressure sorters are used in the preparation of paper pulp suspensions, specifically to process the pulp suspension in wet screening.
  • a pressure sorter contains a screen element which is provided with a large number of openings. The fibers contained in the suspension should pass through the openings as accept, while the unwanted solid components are rejected and passed out of the sorter as rejects.
  • the rotor blades are formed by elevations, for example in DE-OS 3701669.
  • a well-known example of the use of rotationally symmetrical, previously cylindrical screen elements, which can be produced in particular by the method also claimed, is the sorting of pulp suspensions, as is carried out in pressure sorters in the paper-making industry.
  • the fibers contained in the suspension should pass through the sieve element, while the unwanted solid constituents are rejected at the gap and passed out of the sieve device again.
  • the openings have an essentially elongated shape, that is, slits or gaps, fibrous, elongated particles are more easily let through than the cubic, undesired impurities, even if both types should be present in a similar order of magnitude.
  • the This method is used for sieve baskets in which the rods are inserted on the inner edge of the retaining rings. Such an arrangement of the rods is chosen if the suspension is to pass through the slots from the inside to the outside (centrifugal operation). To reshape the retaining rings, bending forces are introduced from the outside at the joint ends, with the joint ends being supported on the inside on support rollers.
  • DE 44 35 538 A1 shows an alternative method for producing such baskets. This method is used with strainer baskets where the rods are inserted on the outer edge of the retaining rings. Such an arrangement of the rods is chosen if the suspension is to pass the slots from the outside to the inside (centripetal operation).
  • the radius of curvature of the retaining rings is increased.
  • EP 31 43 198 A1 describes a sieve device in which the retaining rings are each formed by a rod holder package made up of several rod holders. When the rod holder packages are bent into rings, the profile rods are clamped in the recesses due to the different position of the neutral fibers of the rod holders of a rod holder package.
  • the object of the invention is to improve the sorting.
  • the object was achieved in that the sieve element is conical.
  • the conical shape provides additional design options in a simple manner with regard to the annular gap between the rotor and the screen element on the one hand and the screen openings on the other hand. Because of the thickening occurring in the annular gap towards the reject outlet, it can be advantageous that the width of the annular gap between the rotor and the sieve element decreases continuously from the suspension inlet to the reject outlet. Accordingly, the wider sieve end of the conical sieve element is then located in the area of the inlet.
  • the width of the annular gap between the rotor and the sieve element increases continuously from the suspension inlet to the reject outlet.
  • the wider sieve end of the conical sieve element is located in the area of the reject outlet.
  • Rotors that are designed as cylindrical drums are easy to manufacture. The change in the annular gap then takes place exclusively via the conical screen element.
  • the change in width of the annular gap is to be supported by the rotor, it must be designed as a conical drum.
  • the width of the annular gap between the rotor and the sieve element remains constant from the suspension inlet to the reject outlet.
  • the rotor would have to be designed as a conical drum, the wider end of the rotor being at the wider end of the sieve element.
  • the rotor blades should have the same shape and / or the same radial extent.
  • the axis of rotation should advantageously be inclined or perpendicular to the machine plane.
  • the inclination of the conical screen element jacket to the screen axis is less than 2 °, preferably between 0.1 and 1 °, and / or the diameter of the conical screen element differs by a maximum of 10 mm.
  • the open area and / or the size of the sieve openings of the sieve element increases slightly in the direction of the widening conical end of the sieve element.
  • the essence of the invention is that the sieve element is conical.
  • the inclination of the profile rods to the screen axis should be less than 2 °, in particular less than 1 ° and / or the diameter of the conical screen element should differ by a maximum of 10 mm.
  • the bar holders In order to do justice to the inclination of the profile bars, the bar holders should be designed differently. To compensate for the conicity, the rod holders can differ from one another in terms of inner or outer diameter or the depth of their recesses. In addition, with a constant cross-section of the profile bars, via the conicity of the screen element, the distance between the profile bars of the screen element increases slightly in the direction of the widening conical end of the screen element. This can be used to influence the throughput and / or the sorting effect and reduce wear.
  • Such a rotationally symmetrical sieve element is advantageously produced in that a permanent form fit is generated between the profile bars and the recesses via forces acting radially from the outside.
  • the radial force is applied directly to the rod holder.
  • Manufacture is particularly simple if the radial force is applied via a plurality of punches acting radially from the outside.
  • stamps should preferably be distributed equally spaced around the circumference of the screen cylinder.
  • the pressing surface of the punch pointing in the pressing direction, ie towards the center axis of the sieve device should be concave, this pressing surface advantageously being formed perpendicular to the cylinder axis by a circular segment, the radius of which corresponds to the outer radius of the finished, cylindrical sieving device. This makes it possible to distribute the forces increasingly evenly to the radial outside of the rod holder during pressing. In addition to a uniform change in shape, this protects the rod holder.
  • the punches should be guided in a radially movable manner and / or axially fixed to the cylinder axis at least during the radial action of force.
  • FIGS. 1 a + b a schematic perspective view of various rotationally symmetrical screen elements 3;
  • FIGS. 2a + b a schematic cross section through the screen elements 3 according to FIGS. 1 a + b with punches 15;
  • FIGS. 3a + b the recess 14 with the profile bar 6 before and after the radial action of force
  • FIG. 4 a schematic longitudinal section through a pressure sorter
  • FIG. 4 one recognizes a pressure sorter according to the invention with a sieve element 3 in the form of an essentially cylindrical sieve basket with a very small conicity, which cannot be seen here, and a vertical sieve axis 2.
  • This sieve element 3 divides the interior of the pressure sorter into an inlet space 4 and an accepted material space 11.
  • the fiber suspension 1 is fed into the feed space 4 via a suspension feed 8.
  • the part of the pulp suspension 1 rejected by the sieve element 3 is conveyed as reject via the reject outlet 9 from the inlet chamber 4.
  • the suspension inlet 8 can also be located at the lower end and the reject outlet 9 at the upper end of the screen basket.
  • This screen scraper is formed by a rotor 5 rotating in the screen element 3 with rotor blades 12 attached thereto.
  • the rotor 5 here has the shape of a cylindrical drum, the axis of rotation 13 coinciding with the sieve axis 2.
  • All rotor blades 12 here have the same shape and the same radial extent, which leads to a uniform effect on the pulp suspension 1 and the sieve element 3.
  • the rotor blades 12 are designed as elevations on the rotor 5, which accordingly have no radial spacing from the rotor 5.
  • the cross-sectional area of the rotor blades running in the direction of rotation of the rotor 5 is designed as a rectangle.
  • the rotor blades 12 can, however, also be configured differently, for example with an airfoil profile.
  • the open area and / or the size of the sieve openings of the sieve element 3 can be enlarged in the direction of the widening conical end of the sieve element 3.
  • slightly conical sieve element 3 can also be used to change the course of the annular gap between the rotor 5 and the sieve element 3.
  • FIGS. 5a-c This is to be shown in FIGS. 5a-c as an example and with a greatly exaggerated conicity.
  • the rotor 5 is designed as a cylindrical drum, so that the width of the annular gap between the rotor 5 and the sieve element 3 increases exclusively in accordance with the conical widening of the sieve element 3.
  • the rotor 5 in FIGS. 5b and 5c is designed as an essentially cylindrical drum with a slight conicity.
  • the conical screen element 3 and the conical rotor 5 widen in the same axial direction, so that the width of the annular gap between rotor 5 and Sieve element 3 remains constant in the axial direction, ie from the suspension inlet 8 to the reject outlet 9.
  • the conicity of the sieve element 3 is used for the described influencing of the open area or the size of the sieve openings, without this being associated with a widening of the annular gap.
  • the conical screen element 3 and the conical rotor 5 widen in opposite, axial directions, so that the widening of the annular gap is further increased compared to the embodiment according to FIG. 5a.
  • the conicity of the sieve element 3 is very small, which has a simplifying effect on its clearance position.
  • the inclination of the lateral surface of the sieve element 3 to the sieve axis 2 is less than 1 °.
  • the diameter widens by a maximum of 10 mm.
  • the rotationally symmetrical, here essentially cylindrical but slightly conical screen elements 3 preferably consist of essentially parallel, i.e. likewise slightly conical to the cylinder and sieve axis 2 running profile bars 6, which are held by a plurality of axially spaced apart and perpendicular to the sieve axis 2 bar holders 7.
  • the rod holders 7 are produced here as one-piece rings, for example by means of laser cutting, the diameter being slightly larger than that of the final screen basket. This is the basis for a high degree of dimensional accuracy of the sieve element 3.
  • the bar holder 7 on the inside and in Figure 1b and 2b on the outside a plurality of evenly distributed recesses 14 for the profile bars 6.
  • the recesses 14 offer sufficient play according to Figure 3a, so that the profile bars 6 can easily be pushed axially through this.
  • the sieve openings of the sieve basket i.e. of the screen element 3 are formed by the slots in adjacent profile bars 6.
  • such slots often have a width between 0.05 and 2 mm.
  • FIG. 2 b shows the other case in which the recesses 14 are present on the outside of the rod holders 7 and the radial force is exerted on the profile rods 6 and thus only indirectly on the rod holders 7.
  • the radial force is implemented according to FIGS. 2a + b via several punches 15, which are arranged radially evenly distributed over the cylinder circumference and which are directed radially from the outside onto the bar holder 7 or profile bars 6 and in particular onto the sieve axis 2 of the sieve basket.
  • the pressing surface of all punches 15 pointing in the pressing direction is each formed by a segment of a circle, its 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 rod holders 7 or profile rods 6 is slightly larger before the pressing process than afterwards, there is a little play at the beginning of the pressing process between the rod holders 7 or profile rods 6 and the pressing surface in the middle part of the punch 15. This play can be accepted at the beginning of pressing and the associated lower pressing forces and decreases as the pressing progresses.
  • the punches 15 are guided axially and radially in guide grooves.
  • the rod holders 7 can also be composed of several partial rod holders, which have different heights in the radial direction R, so that their neutral fibers differ from one another.
  • the inclination of the profile bars 6 to the sieve axis 2 is less than 1 ° or, in general, the expansion of the diameter of the conical sieve element 3 is a maximum of 10 mm.
  • the rod holders 7 are designed differently to compensate for the conicity. In addition to varying the inside and / or outside diameter of the rod holders 7, changing the radial depth of the recesses 14 is also possible.
  • the end rings can be attached to the two ends of the sieve element 3 in a plane-parallel-cylindrical manner.
  • the distance between the profile bars 6 of the sieve element 3 increases slightly in the direction of the widening conical end of the sieve element 3. This expansion is usually not critical for the sorting. On the contrary, it can be used consciously to influence throughput and sorting effect along the annular gap. In most cases, larger sieve openings in the direction of the reject outlet 9 will be preferred.

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  • 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)

Abstract

L'invention concerne un trieur sous pression servant à épurer une suspension de matière fibreuse (1), comprenant un élément tamis (3) symétrique en rotation autour d'un axe de tamis (2), qui divise le trieur sous pression en un compartiment d'alimentation (4) et un compartiment de produit épuré (11), le compartiment d'alimentation (4) étant relié à une extrémité axiale à une arrivée de suspension (8) ainsi qu'à l'extremite axiale opposée à une évacuation de rejets (9) et le compartiment de produit épuré (11) étant relié à une évacuation de produit épuré (10) et un rotor (5) comprenant des pales de rotor (12) se trouvant dans le compartiment d'alimentation (4), l'axe de rotation (13) duquel correspond à l'axe de tamis (2) et lequel tourne par rapport à l'élément tamis (3). Le triage doit etre amelioré par le fait que l'élément tamis (3) est conçu de forme conique.
PCT/EP2020/053864 2019-03-26 2020-02-14 Trieur sous pression, élément de tamisage et procédé pour la fabrication d'un élément de tamisage WO2020193003A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019107693.5 2019-03-26
DE102019107693.5A DE102019107693A1 (de) 2019-03-26 2019-03-26 Drucksortierer

Publications (1)

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WO2020193003A1 true WO2020193003A1 (fr) 2020-10-01

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DE (1) DE102019107693A1 (fr)
WO (1) WO2020193003A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1448814A (fr) * 1965-04-15 1966-08-12 Ingersoll Rand Canada Appareil de tamisage
DE3701669A1 (de) 1987-01-22 1988-08-04 Voith Gmbh J M Sortierfluegel
DE4432842A1 (de) * 1994-09-15 1996-03-28 Voith Sulzer Stoffaufbereitung Verfahren zum Ausbringen unerwünschter Feststoffpartikel aus einer wässerigen Faserstoffsuspension sowie Vorrichtung zu seiner Ausführung
DE4435538A1 (de) 1994-10-05 1996-04-18 Voith Gmbh J M Verfahren zur Herstellung eines Flachsiebes
US5601690A (en) * 1994-07-11 1997-02-11 Gauld Equipment Company Method for screening pulp
WO1998053135A1 (fr) 1997-05-21 1998-11-26 Valmet Corporation Agencement de racle pour appareil d'epuration de pate
DE102006007660A1 (de) 2006-02-22 2007-08-23 Voith Patent Gmbh Verfahren zur Herstellung einer rotations-symmetrischen, insbesondere zylindrischen Siebvorrichtung
WO2009062287A1 (fr) * 2007-11-14 2009-05-22 Filtration Fibrewall Inc. Panier épurateur
EP3143198A1 (fr) 2014-05-15 2017-03-22 Voith Patent GmbH Procédé de fabrication d'un dispositif de criblage
DE102017129765B3 (de) * 2017-12-13 2018-09-20 Voith Patent Gmbh Siebzylinder

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT368560B (de) * 1981-02-18 1982-10-25 Andritz Ag Maschf Sortierer
DE4425740A1 (de) * 1994-07-21 1994-12-01 Voith Gmbh J M Sichter für Papierstoffsuspensionen
ATE281554T1 (de) * 2000-02-19 2004-11-15 Voith Paper Patent Gmbh Sieb für fasersuspensionen sowie verfahren zu seiner herstellung
DE102018101666B3 (de) * 2018-01-25 2018-09-20 Voith Patent Gmbh Siebzylinder

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1448814A (fr) * 1965-04-15 1966-08-12 Ingersoll Rand Canada Appareil de tamisage
DE3701669A1 (de) 1987-01-22 1988-08-04 Voith Gmbh J M Sortierfluegel
US5601690A (en) * 1994-07-11 1997-02-11 Gauld Equipment Company Method for screening pulp
DE4432842A1 (de) * 1994-09-15 1996-03-28 Voith Sulzer Stoffaufbereitung Verfahren zum Ausbringen unerwünschter Feststoffpartikel aus einer wässerigen Faserstoffsuspension sowie Vorrichtung zu seiner Ausführung
DE4435538A1 (de) 1994-10-05 1996-04-18 Voith Gmbh J M Verfahren zur Herstellung eines Flachsiebes
WO1998053135A1 (fr) 1997-05-21 1998-11-26 Valmet Corporation Agencement de racle pour appareil d'epuration de pate
DE102006007660A1 (de) 2006-02-22 2007-08-23 Voith Patent Gmbh Verfahren zur Herstellung einer rotations-symmetrischen, insbesondere zylindrischen Siebvorrichtung
WO2009062287A1 (fr) * 2007-11-14 2009-05-22 Filtration Fibrewall Inc. Panier épurateur
EP3143198A1 (fr) 2014-05-15 2017-03-22 Voith Patent GmbH Procédé de fabrication d'un dispositif de criblage
DE102017129765B3 (de) * 2017-12-13 2018-09-20 Voith Patent Gmbh Siebzylinder

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Publication number Publication date
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