EP3723916A1 - Screen cylinder - Google Patents

Screen cylinder

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Publication number
EP3723916A1
EP3723916A1 EP18789112.2A EP18789112A EP3723916A1 EP 3723916 A1 EP3723916 A1 EP 3723916A1 EP 18789112 A EP18789112 A EP 18789112A EP 3723916 A1 EP3723916 A1 EP 3723916A1
Authority
EP
European Patent Office
Prior art keywords
recesses
rod holder
bar
bars
outside
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.)
Granted
Application number
EP18789112.2A
Other languages
German (de)
French (fr)
Other versions
EP3723916B1 (en
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
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Publication of EP3723916A1 publication Critical patent/EP3723916A1/en
Application granted granted Critical
Publication of EP3723916B1 publication Critical patent/EP3723916B1/en
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 cylindrical screening device with a plurality of profiled bars, in which a plurality of annular, perpendicular to the cylinder axis and spaced rod holder are provided on the inside or outside with open-edged recesses, the shape of the bar feet of the profiled bars substantially complementary and corresponds to the slightly are larger than the rod feet and in which the profile bars are used parallel to each other and parallel to the cylinder axis in the recesses
  • the invention also relates to methods for producing the screening device.
  • cylindrical screening devices that can be produced by the method of this type is the sorting of pulp suspensions, as is done in pressure sorters of the paper-producing industry.
  • the fibers contained in the suspension should pass through the sieve, while the unwanted solid constituents are rejected at the gap and are led out of the sieve device again.
  • the openings have a substantially elongated shape, that is slots or gaps, allows fibrous particles to pass through more easily than the cubic ones, even though both species should be of similar size.
  • the object of the invention is to reduce the production cost with the best possible strength and increased life of the screening device.
  • this object is achieved in that at least two of each profile bar associated recesses differ in shape from each other in such a way that between them results in a slight offset of the corresponding contact surface with the profile bar.
  • the offset in more than two rod holders when the direction of the offset viewed in the axial direction alternately reversed.
  • the different recesses can be efficiently separated out of the rod holders by means of laser, wire or water jet cutting or the like.
  • the rod holder Since the rod holder is already present as a ring and is usually made in one piece, the production is simplified considerably. In addition to an exact cylindrical shape, this results in a high accuracy in the recesses and thus the screen openings.
  • laser cutting or wire EDM may result in slight deviations in shape, so that a particularly simple manufacturer driving consists in the recesses being cut out by means of a laser or erosion wire moving along the inside or outside of the respective rod holder and the beginning of the section of at least two rod holders of the screen cylinder offset from one another.
  • the contact surface of axially adjacent recesses of the profiled bars is to be offset, this can be achieved particularly simply by arranging the beginning of the section of the respectively adjacent bar holder of the screen cylinder offset relative to one another. If an additional fixation of the profiled bars in the recesses is required or desired, then a permanent positive connection between the profiled bars and the recesses can be generated by radially acting from outside forces.
  • the radial force is applied to the profile bars and indirectly via this on the rod holder.
  • the inside of the same during the radial force should not be subjected to supporting or bending forces.
  • the punches should be guided radially movably at least during the radial force action and / or be fixed axially to the cylinder axis.
  • FIG. 1 shows a schematic longitudinal section through a cylindrical strainer basket
  • FIGS. 2a + b a schematic cross section through different baskets
  • Figures 3a + b the recess 4 with profiled bar 1 before and after the radial force
  • FIG. 4 shows an axial partial section through a plurality of rod holders 3 with profiled bar 1.
  • the rod holder 3 are produced as one-piece rings here by way of example by means of laser cutting, wherein the diameter is slightly larger than the final strainer basket. This is the basis for a high dimensional accuracy of the screen basket.
  • the rod holder 3 have on the inside and in Figure 2b on the outside a plurality of evenly distributed recesses 4 arranged for the profile bars 1.
  • the recesses 4 provide according to Figure 3a sufficient clearance, so that the profile bars 1 easily axially through this can be pushed.
  • the prefabricated screen basket consists of parallel to the cylinder axis 2 extending profile bars 1, which are held over a plurality of axially spaced-apart and perpendicular to the cylinder axis 2 extending rod holder 3.
  • the screen openings of the screen basket are formed by the slots of adjacent profile bars 1.
  • such slots 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, that between them a slight offset of the corresponding contact surface 6 with the profile bar 1 in the circumferential direction 7 results. Although this somewhat impedes the insertion of the profile bars 1 in the recesses 4, but simplifies the other hand, the fixation of the profile bars 1 considerably.
  • the same can also be achieved with an offset in the radial direction or a mixture of both directions.
  • the offset can be deliberately generated by means of the laser.
  • Figure 2 b shows the other case in which the recesses 4 are present on the outside of the rod holder and the radial force is applied to the profile bars 1 and thus only indirectly on the rod holder 3.
  • the inside of the rod holder 3 is exposed during the radial force no supporting or bending forces, it comes to a, albeit small reduction in the diameter of the rod holder 3 and a plastic deformation of the rod holder 3 in the region of the recesses 4, in the sequence of which the space between profile bar 1 and bar holder 3, as shown in Figure 3b, is closed.
  • the radial force is thereby realized according to the figures 2a + b over a plurality of radially evenly distributed over the cylinder circumference arranged punch 5, which are directed radially from the outside to the rod holder 3 or profile bars 1 and thereby in particular to the cylinder axis 2 of the screen basket.
  • the, in the pressing direction pointing pressing surface of all punches 5 each formed by a circular section whose radius corresponds to the outer radius of the screening device after the pressing process. Since the outer radius of the sieve device formed by the rod holders 3 or profiled bars 1 is slightly larger than before after the pressing process, there is a small clearance at the beginning of the pressing process between the bar holders 3 or profiled bars 1 and the pressing surface in the middle part of the punch 5.
  • This game can be taken at the beginning of pressing and the associated lower pressing forces in purchasing and decreases with progressive pressure. This transformation is very gentle and even, so that it comes to the rod holders 3 to no overuse
  • the punches 5 are guided axially and radially in guide grooves.

Abstract

The invention relates to a cylindrical screen device with a plurality of profiled bars (1), wherein the inner or outer face of a plurality of mutually spaced annular bar holders (3), which run perpendicularly to the cylinder axis (2), is provided with recesses (4) that are open at the edges, have a shape which substantially corresponds to the bases of the profiled bars (1) in a complementary manner, and are slightly larger than the bar bases, and the profiled bars (1) are inserted into the recesses (4) parallel to one another and parallel to the cylinder axis (2). The invention also relates to a method for producing the screen device. The production complexity is to be reduced while improving the strength and increasing the service life of the screen device. This is achieved in that at least two of the recesses (4) paired with each profiled bar (1) differ in form such that a slight offset of the corresponding contact surface (6) with the profiled bar (1) is produced between the recesses.

Description

Siebzylinder  screen cylinder
Die Erfindung betrifft eine zylindrische Siebvorrichtung mit einer Vielzahl von Profilstäben, bei der mehrere ringförmige, senkrecht zur Zylinderachse verlaufende und voneinander beabstandete Stabhalter an der Innen- oder Außenseite mit randoffenen Aussparungen versehen sind, deren Form den Stabfüßen der Profilstäbe im Wesentlichen komplementär entspricht und die geringfügig größer als die Stabfüße sind und bei der die Profilstäbe parallel zueinander und parallel zur Zylinderachse in die Aussparungen eingesetzt werden The invention relates to a cylindrical screening device with a plurality of profiled bars, in which a plurality of annular, perpendicular to the cylinder axis and spaced rod holder are provided on the inside or outside with open-edged recesses, the shape of the bar feet of the profiled bars substantially complementary and corresponds to the slightly are larger than the rod feet and in which the profile bars are used parallel to each other and parallel to the cylinder axis in the recesses
Die Erfindung betrifft auch Verfahren zur Herstellung der Siebvorrichtung. The invention also relates to methods for producing the screening device.
Ein bekanntes Beispiel für den Einsatz von zylindrischen Siebvorrichtungen, die nach dem Verfahren dieser Art herstellbar sind, ist das Sortieren von Faserstoffsuspensionen, wie es in Drucksortierern der papiererzeugenden Industrie durchgeführt wird. A well-known example of the use of cylindrical screening devices that can be produced by the method of this type is the sorting of pulp suspensions, as is done in pressure sorters of the paper-producing industry.
Dabei sollen die in der Suspension enthaltenen Fasern durch das Sieb hindurch treten, während die nicht gewünschten festen Bestandteile an dem Spalt abgewiesen und aus der Siebvorrichtung wieder herausgeleitet werden.  In this case, the fibers contained in the suspension should pass through the sieve, while the unwanted solid constituents are rejected at the gap and are led out of the sieve device again.
Dadurch, dass die Öffnungen eine im Wesentlichen längliche Form haben, also Schlitze oder Spalten sind, werden faserige Teilchen leichter durchgelassen als die kubischen, auch wenn beide Arten in ähnlicher Größenordnung vorliegen sollten. The fact that the openings have a substantially elongated shape, that is slots or gaps, allows fibrous particles to pass through more easily than the cubic ones, even though both species should be of similar size.
Mit einer derartigen Sortiertechnologie ist daher ein sehr guter Ausscheidungseffekt von nicht faserigen Störstoffen aus Faserstoffsuspensionen möglich. With such a sorting technology, therefore, a very good precipitation effect of non-fibrous contaminants from pulp suspensions is possible.
Denkbar ist auch ein Einsatz zur Trennung unterschiedlicher Faserbestandteile, der sogenannten Faserfraktionierung. Voraussetzung ist allerdings eine hohe Präzision der Schlitzform auf der ganzen Siebfläche.  It is also conceivable to use for the separation of different fiber components, the so-called fiber fractionation. Prerequisite, however, is a high precision of the slot shape on the whole screen surface.
Ein mögliches Verfahren, um solche Siebkörbe herzustellen, zeigt die DE 10 2006 007 660 A1 , bei der die Profilstäbe durch plastisches Verformen der mit Vertiefungen für die Stäbe vorgesehenen c-förmigen Halteringe eingeklemmt werden. Hierzu werden für derartige Herstellungsverfahren besonders geeignete Profilstäbe verwendet. Mit Hilfe dieses Verfahrens gelang es, die Herstellung wesentlich zu verbilligen. Das Verfahren wird bei Siebkörben verwendet, bei denen die Stäbe am Innenrand der Halteringe eingesetzt werden. Eine solche Anordnung der Stäbe wird gewählt, wenn die Suspension von innen nach außen die Schlitze passieren soll (zentrifugale Fahrweise). A possible method for producing such baskets is shown in DE 10 2006 007 660 A1, in which the profiled bars are clamped by plastic deformation of the c-shaped retaining rings provided with depressions for the bars. For this purpose, particularly suitable profile bars are used for such production methods. With the help of this method, it was possible to significantly increase the production cheapen. The method is used in screen baskets in which the rods are inserted at the inner edge of the retaining rings. Such an arrangement of the bars is selected if the suspension is to pass through the slots from the inside to the outside (centrifugal driving).
Zur Umformung der Halteringe werden an den Stoßenden von außen Biegekräfte eingeleitet, wobei sich die Stoßenden auf der Innenseite auf Stützwalzen abstützen. To transform the retaining rings bending forces are initiated at the butt ends from the outside, wherein the butt ends are supported on the inside on support rollers.
Ein alternatives Verfahren, um solche Siebkörbe herzustellen, zeigt die DE 44 35 538 A1. Dieses Verfahren wird bei Siebkörben verwendet, bei denen die Stäbe am Außenrand der Halteringe eingesetzt werden. Eine solche Anordnung der Stäbe wird gewählt, wenn die Suspension von außen nach innen die Schlitze passieren soll (zentripetale Fahrweise). An alternative method for producing such baskets is shown in DE 44 35 538 A1. This method is used in screen baskets in which the bars are inserted at the outer edge of the retaining rings. Such an arrangement of the bars is selected if the suspension is to pass through the slots from the outside to the inside (centripetal procedure).
Zur Fixierung der Profilstäbe wird dabei der Krümmungsradius der Halteringe vergrößert.  For fixing the profile bars while the radius of curvature of the retaining rings is increased.
Wichtig ist, dass die Dimensionen der Sieböffnungen mit sehr geringen Toleranzen eingehalten werden. Um sie von Verstopfungen frei zu halten, sind zumeist Räumer erforderlich, die in geringerem Abstand an der Siebfläche vorbei bewegt werden und die hydraulische Impulse erzeugen. Siebvorrichtungen für den Einsatz in Drucksortierern müssen daher sehr präzise gefertigt sein und hohen Belastungen standhalten. It is important that the dimensions of the screen openings are kept to very tight tolerances. In order to keep them free of blockages, scrapers are usually required, which are moved at a smaller distance past the screen surface and generate the hydraulic impulses. Screening devices for use in pressure sorters must therefore be manufactured very precisely and withstand high loads.
Die Aufgabe der Erfindung ist es den Herstellungsaufwand bei möglichst verbesserter Festigkeit und gesteigerter Lebensdauer der Siebvorrichtung zu vermindern. The object of the invention is to reduce the production cost with the best possible strength and increased life of the screening device.
Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass sich zumindest zwei der jeweils einem Profilstab zugeordneten Aussparungen hinsichtlich ihrer Form derart voneinander unterscheiden, dass sich zwischen ihnen ein geringfügiger Versatz der entsprechenden Kontaktfläche mit dem Profilstab ergibt. According to the invention, this object is achieved in that at least two of each profile bar associated recesses differ in shape from each other in such a way that between them results in a slight offset of the corresponding contact surface with the profile bar.
Infolge des wenn auch geringen Versatzes der Aussparungen kommt es zum Verklemmen der Profilstäbe in diesen Aussparungen. Dabei ist der Versatz allerdings so gering, dass ein axiales Einschieben oder ein radiales Eindrücken der Profilstäbe in diese Aussparungen möglich bleibt. Due to the albeit small offset of the recesses, it comes to jamming of the profile bars in these recesses. However, the offset is so small that an axial insertion or a radial indentation of the profiled bars remains possible in these recesses.
Nach dem Einführen aller Profilstäbe ergibt sich so eine stabile Konstruktion des zylindrischen Siebkorbes und eine stabile Lage der Stabhalter, so dass eine weitere Fixierung der Profilstäbe in den Aussparungen meist nicht erforderlich ist.  After the insertion of all profile bars, this results in a stable construction of the cylindrical screen basket and a stable position of the rod holder, so that a further fixation of the profile bars in the recesses is usually not required.
Um die Verschränkung zwischen den Profilstäben und den Stabhaltern zu vervollkommnen, ist es vorteilhaft, wenn sich die jeweils axial benachbarten Aussparungen eines Profilstabes hinsichtlich ihrer Form derart voneinander unterscheiden, dass sich zwischen ihnen ein geringfügiger Versatz der entsprechenden Kontaktfläche mit dem Profilstab ergibt. In order to perfect the entanglement between the profiled bars and the rod holders, it is advantageous if the respective axially adjacent recesses of a profiled bar differ from one another with respect to their shape such that a slight offset of the corresponding contact area with the profiled bar results between them.
Besonders wirksam ist der Versatz bei mehr als zwei Stabhaltern, wenn sich die Richtung des Versatzes in axialer Richtung betrachtet abwechselnd umgekehrt. Mit Vorteil lassen sich die unterschiedlichen Aussparungen mittels Laser-, Draht-, Wasserstrahlschneiden o.ä effizient aus den Stabhaltern heraustrennen.  Particularly effective is the offset in more than two rod holders, when the direction of the offset viewed in the axial direction alternately reversed. Advantageously, the different recesses can be efficiently separated out of the rod holders by means of laser, wire or water jet cutting or the like.
Da der Stabhalter bereits als Ring vorliegt und in der Regel einstückig ausgeführt ist, vereinfacht sich die Herstellung wesentlich. Neben einer exakten zylindrischen Form ergibt sich dadurch eine hohe Genauigkeit bei den Aussparungen und damit auch den Sieböffnungen. Since the rod holder is already present as a ring and is usually made in one piece, the production is simplified considerably. In addition to an exact cylindrical shape, this results in a high accuracy in the recesses and thus the screen openings.
Insbesondere beim Laserschneiden oder Drahterodieren können sich geringfüge Formabweichungen ergeben, so dass ein besonders einfaches Herstellerfahren darin besteht, dass die Aussparungen mittels eines an der Innen- oder Außenseite des jeweiligen Stabhalters entlangfahrenden Lasers oder Erodierdrahtes herausgeschnitten werden und der Beginn des Schnitts zumindest zweier Stabhalter des Siebzylinders versetzt zueinander angeordnet ist. In particular, laser cutting or wire EDM may result in slight deviations in shape, so that a particularly simple manufacturer driving consists in the recesses being cut out by means of a laser or erosion wire moving along the inside or outside of the respective rod holder and the beginning of the section of at least two rod holders of the screen cylinder offset from one another.
Soll die Kontaktfläche axial benachbarter Aussparungen der Profilstäbe versetzt sein, so kann dies besonders einfach dadurch erreicht werden, dass der Beginn des Schnitts der jeweils benachbarten Stabhalter des Siebzylinders versetzt zueinander angeordnet ist. Falls eine zusätzliche Fixierung der Profilstäbe in den Aussparungen erforderlich oder gewünscht ist, so kann über radial von außen einwirkende Kräfte ein dauerhafter Formschluss zwischen den Profilstäben und den Aussparungen erzeugt werden.If the contact surface of axially adjacent recesses of the profiled bars is to be offset, this can be achieved particularly simply by arranging the beginning of the section of the respectively adjacent bar holder of the screen cylinder offset relative to one another. If an additional fixation of the profiled bars in the recesses is required or desired, then a permanent positive connection between the profiled bars and the recesses can be generated by radially acting from outside forces.
Diese radialen Kräfte führen zu einer plastischen Verformung der Stabhalter im Bereich der Aussparung und über die Verengung der Aussparungen letztlich zur Klemmung der Profilstäbe in denselben. These radial forces lead to a plastic deformation of the rod holder in the region of the recess and the constriction of the recesses ultimately for clamping the profile bars in the same.
Sind dabei die die Aussparungen nur auf der Innenseite der Stabhalter vorhanden, so erfolgt die radiale Krafteinwirkung direkt auf die Stabhalter If the recesses are present only on the inside of the rod holders, the radial force is applied directly to the rod holders
Im anderen Fall, dass die Aussparungen nur auf der Außenseite der Stabhalter vorhanden sind, erfolgt die radiale Krafteinwirkung auf die Profilstäbe und über diese indirekt auf die Stabhalter. In the other case, that the recesses are present only on the outside of the rod holder, the radial force is applied to the profile bars and indirectly via this on the rod holder.
Zur Schonung der Stabhalter sollte die Innenseite derselben während der radialen Krafteinwirkung keinen Stütz- oder Biegekräften ausgesetzt werden. To protect the rod holder, the inside of the same during the radial force should not be subjected to supporting or bending forces.
Besonders einfach gestaltet sich die Fierstellung, wenn die radiale Krafteinwirkung über mehrere, radial von außen einwirkende Stempel erfolgt. Diese Stempel sollten vorzugsweise mit gleichem Abstand über den Umfang des Siebzylinders verteilt angeordnet sein. Des Weiteren sollte die, in Pressrichtung, d.h. zur Zentrumsachse der Siebvorrichtung weisende Pressfläche der Stempel konkav ausgebildet sein, wobei diese Pressfläche mit Vorteil senkrecht zur Zylinderachse von einem Kreisabschnitt gebildet wird, dessen Radius dem Außenradius der fertigen, zylindrischen Siebvorrichtung entspricht. Flierdurch gelingt es während des Pressens die Kräfte zunehmend gleichmäßiger auf die radiale Außenseite der Stabhalter zu verteilen. Neben einer gleichmäßigen Formveränderung schont dies die Stabhalter.The Fierstellung designed particularly simple when the radial force is applied via a plurality of radially acting from the outside punch. These punches should preferably be distributed equidistantly over the circumference of the screen cylinder. Furthermore, in the pressing direction, i. to the center axis of the screening device facing pressing surface of the punch to be concave, said pressing surface is formed perpendicular to the cylinder axis with advantage of a circular section whose radius corresponds to the outer radius of the finished, cylindrical screening device. Flierdurch manages to distribute the forces during pressing increasingly uniformly on the radial outer side of the rod holder. In addition to a uniform shape change, this protects the rod holder.
Im Interesse einer exakten Führung sollten die Stempel zumindest während der radialen Krafteinwirkung radial beweglich geführt und/oder axial zur Zylinderachse fixiert sein. In the interest of a precise guidance, the punches should be guided radially movably at least during the radial force action and / or be fixed axially to the cylinder axis.
Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden. In der beigefügten Zeichnung zeigt: The invention will be explained in more detail with reference to an exemplary embodiment. In the attached drawing shows:
Figur 1 : einen schematischen Längsschnitt durch einen zylindrischen Siebkorb;  FIG. 1 shows a schematic longitudinal section through a cylindrical strainer basket;
Figuren 2a+b: einen schematischen Querschnitt durch verschiedene Siebkörbe; Figures 2a + b: a schematic cross section through different baskets;
Figuren 3a+b: die Aussparung 4 mit Profilstab 1 vor und nach der radialen Krafteinwirkung und Figures 3a + b: the recess 4 with profiled bar 1 before and after the radial force and
Figur 4: einen axialen Teilschnitt durch mehrere Stabhalter 3 mit Profilstab 1.  FIG. 4 shows an axial partial section through a plurality of rod holders 3 with profiled bar 1.
Die Stabhalter 3 werden als einstückige Ringe hier beispielhaft mittels Laserschneiden hergestellt, wobei der Durchmesser geringfügig größer als beim endgültigen Siebkorb ist. Dies ist die Grundlage für eine hohe Formgenauigkeit des Siebkorbes. The rod holder 3 are produced as one-piece rings here by way of example by means of laser cutting, wherein the diameter is slightly larger than the final strainer basket. This is the basis for a high dimensional accuracy of the screen basket.
Bei Figur 1 und 2a besitzen die Stabhalter 3 auf der Innenseite und bei Figur 2b auf der Außenseite eine Vielzahl gleichmäßig verteilt angeordneter Aussparungen 4 für die Profilstäbe 1. Die Aussparungen 4 bieten gemäß Figur 3a ausreichend Spiel, so dass die Profilstäbe 1 problemlos axial durch diese geschoben werden können. In Figure 1 and 2a, the rod holder 3 have on the inside and in Figure 2b on the outside a plurality of evenly distributed recesses 4 arranged for the profile bars 1. The recesses 4 provide according to Figure 3a sufficient clearance, so that the profile bars 1 easily axially through this can be pushed.
Im Ergebnis besteht der so vorgefertigte Siebkorb aus parallel zur Zylinderachse 2 verlaufenden Profilstäben 1 , die über mehrere axial voneinander beabstandete und senkrecht zur Zylinderachse 2 verlaufende Stabhalter 3 gehalten werden.  As a result, the prefabricated screen basket consists of parallel to the cylinder axis 2 extending profile bars 1, which are held over a plurality of axially spaced-apart and perpendicular to the cylinder axis 2 extending rod holder 3.
Die Sieböffnungen des Siebkorbes werden von den Schlitzen benachbarter Profilstäbe 1 gebildet. In der Praxis haben solche Schlitze oft eine Weite zwischen 0,05 und 2 mm. The screen openings of the screen basket are formed by the slots of adjacent profile bars 1. In practice, such slots often have a width between 0.05 and 2 mm.
Um die Profilstäbe 1 in den Aussparungen 4 zu fixieren, unterscheiden sich, wie in Figur 4 zu erkennen, die jeweils axial benachbarten Aussparungen 4 eines Profilstabes 1 hinsichtlich ihrer Form derart voneinander, dass sich zwischen ihnen ein geringfügiger Versatz der entsprechenden Kontaktfläche 6 mit dem Profilstab 1 in Umfangsrichtung 7 ergibt. Dies erschwert zwar etwas das Einführen der Profilstäbe 1 in die Aussparungen 4, vereinfacht aber andererseits die Fixierung der Profilstäbe 1 erheblich.  In order to fix the profile bars 1 in the recesses 4, as shown in Figure 4, the respective axially adjacent recesses 4 of a profile bar 1 differ from each other in terms of their shape, that between them a slight offset of the corresponding contact surface 6 with the profile bar 1 in the circumferential direction 7 results. Although this somewhat impedes the insertion of the profile bars 1 in the recesses 4, but simplifies the other hand, the fixation of the profile bars 1 considerably.
Gleiches lässt sich aber auch mit einem Versatz in radialer Richtung oder einer Mischung beider Richtungen erreichen. Der Versatz lässt sich einerseits mittels des Lasers bewusst erzeugen. The same can also be achieved with an offset in the radial direction or a mixture of both directions. On the one hand, the offset can be deliberately generated by means of the laser.
Er ergibt sich auf einfache Weise aber auch dadurch, dass die Aussparungen 4 mittels eines an der Innen- oder Außenseite des jeweiligen Stabhalters 3 entlangfahrenden Lasers herausgeschnitten werden und der Beginn des Laserschnitts der jeweils benachbarten Stabhalter 3 bei der Montage des It results in a simple manner but also in that the recesses 4 are cut out by means of a laser moving along on the inside or outside of the respective rod holder 3 laser and the beginning of the laser section of each adjacent rod holder 3 during assembly of the
Siebzylinders versetzt zueinander angeordnet wird. Hierbei wird die Ungenauigkeit die sich beim üblichen Laserschneiden derzeit ergibt, bewusst ausgenutzt. Screen cylinder offset from each other is arranged. Here, the inaccuracy that results in the conventional laser cutting currently, deliberately exploited.
Falls die Klemmung der Profilstäbe 1 in den Aussparungen 4 verstärkt werden soll, so kann über radial von außen einwirkende Kräfte ein dauerhafter Formschluss zwischen den Profilstäben 1 und den Aussparungen 4 erzeugt werden. If the clamping of the profiled bars 1 is to be reinforced in the recesses 4, a permanent positive connection between the profiled bars 1 and the recesses 4 can be generated via forces acting radially from the outside.
Liegen die Aussparungen 4, wie bei Figur 2a, auf der Innenseite der Stabhalter 3, dann erfolgt die radiale Krafteinwirkung direkt auf die Stabhalter 3. If the recesses 4, as in FIG. 2a, lie on the inside of the rod holders 3, then the radial force is applied directly to the rod holders 3.
Figur 2 b zeigt den anderen Fall, bei dem die Aussparungen 4 auf der Außenseite der Stabhalter vorhanden sind und die radiale Krafteinwirkung auf die Profilstäbe 1 und somit nur indirekt auf die Stabhalter 3 erfolgt. In beiden Fällen kommt es, da die Innenseite der Stabhalter 3 während der radialen Krafteinwirkung keinen Stütz- oder Biegekräften ausgesetzt ist, zu einer, wenn auch geringen Verringerung des Durchmessers der Stabhalter 3 sowie einer plastischen Verformung der Stabhalter 3 im Bereich der Aussparungen 4, in deren Folge der Raum zwischen Profilstab 1 und Stabhalter 3, wie in Figur 3b dargestellt, geschlossen wird. Figure 2 b shows the other case in which the recesses 4 are present on the outside of the rod holder and the radial force is applied to the profile bars 1 and thus only indirectly on the rod holder 3. In both cases, since the inside of the rod holder 3 is exposed during the radial force no supporting or bending forces, it comes to a, albeit small reduction in the diameter of the rod holder 3 and a plastic deformation of the rod holder 3 in the region of the recesses 4, in the sequence of which the space between profile bar 1 and bar holder 3, as shown in Figure 3b, is closed.
Wegen der Profilierung der Profilstäbe 1 sowie der komplementären Form wird so eine starke Klemmung der Stabfüße in der jeweiligen Aussparung 4 erreicht.  Because of the profiling of the profile bars 1 and the complementary shape as a strong clamping of the bar feet in the respective recess 4 is achieved.
Die radiale Krafteinwirkung wird dabei gemäß den Figuren 2a+b über mehrere, radial gleichmäßig über den Zylinderumfang verteilt angeordnete Stempel 5 realisiert, die radial von außen auf die Stabhalter 3 bzw. Profilstäbe 1 und dabei insbesondere auf die Zylinderachse 2 des Siebkorbes gerichtet sind. Hierzu wird die, in Pressrichtung weisende Pressfläche aller Stempel 5 jeweils von einem Kreisabschnitt gebildet, dessen Radius dem Außenradius der Siebvorrichtung nach dem Pressvorgang entspricht. Da der von den Stabhaltern 3 bzw. Profilstäben 1 gebildete Außenradius der Siebvorrichtung vor dem Pressvorgang geringfügig größer als danach ist, besteht am Beginn des Pressvorgangs zwischen den Stabhaltern 3 bzw. Profilstäben 1 und der Pressfläche im mittleren Teil der Stempels 5 ein kleines Spiel. Dieses Spiel kann beim Beginn des Pressens und den damit verbundenen, geringeren Presskräften in Kauf genommen werden und vermindert sich mit fortschreitender Pressung. Diese Umformung erfolgt sehr schonend und gleichmäßig, so dass es an den Stabhaltern 3 zu keiner Überbeanspruchung kommt The radial force is thereby realized according to the figures 2a + b over a plurality of radially evenly distributed over the cylinder circumference arranged punch 5, which are directed radially from the outside to the rod holder 3 or profile bars 1 and thereby in particular to the cylinder axis 2 of the screen basket. For this purpose, the, in the pressing direction pointing pressing surface of all punches 5 each formed by a circular section whose radius corresponds to the outer radius of the screening device after the pressing process. Since the outer radius of the sieve device formed by the rod holders 3 or profiled bars 1 is slightly larger than before after the pressing process, there is a small clearance at the beginning of the pressing process between the bar holders 3 or profiled bars 1 and the pressing surface in the middle part of the punch 5. This game can be taken at the beginning of pressing and the associated lower pressing forces in purchasing and decreases with progressive pressure. This transformation is very gentle and even, so that it comes to the rod holders 3 to no overuse
Während der radialen Krafteinwirkung werden die Stempel 5 in Führungsnuten axial und radial geführt. During the radial force, the punches 5 are guided axially and radially in guide grooves.

Claims

Patentansprüche claims
1. Zylindrische Siebvorrichtung mit einer Vielzahl von Profilstäben (1 ), bei der mehrere ringförmige, senkrecht zur Zylinderachse (2) verlaufende und voneinander beabstandete Stabhalter (3) an der Innen- oder Außenseite mit randoffenen Aussparungen (4) versehen sind, deren Form den Stabfüßen der Profilstäbe (1 ) im Wesentlichen komplementär entspricht und die geringfügig größer als die Stabfüße sind und bei der die Profilstäbe (1 ) parallel zueinander und parallel zur Zylinderachse (2) in die Aussparungen(4) eingesetzt werden, dadurch gekennzeichnet, dass sich zumindest zwei der jeweils einem Profilstab (1 ) zugeordneten Aussparungen (4) hinsichtlich ihrer Form derart voneinander unterscheiden, dass sich zwischen ihnen ein geringfügiger Versatz der entsprechenden Kontaktfläche (6) mit dem Profilstab (1 ) ergibt. 1. Cylindrical sieve with a plurality of profiled bars (1), in which a plurality of annular, perpendicular to the cylinder axis (2) extending and spaced rod holder (3) on the inside or outside with open-edged recesses (4) are provided, the shape of the Bar feet of the profiled bars (1) corresponds substantially complementary and which are slightly larger than the bar feet and in which the profiled bars (1) parallel to each other and parallel to the cylinder axis (2) in the recesses (4) are used, characterized in that at least two of each of a profile bar (1) associated recesses (4) with respect to their shape differ from each other such that there is a slight offset between the corresponding contact surface (6) with the profile bar (1) between them.
2. Zylindrische Siebvorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass sich die jeweils axial benachbarten Aussparungen (4) eines Profilstabes (1 ) hinsichtlich ihrer Form derart voneinander unterscheiden, dass sich zwischen ihnen ein geringfügiger Versatz der entsprechenden Kontaktfläche (6) mit dem Profilstab (1 ) ergibt. 2. Cylindrical screening device according to claim 1, characterized in that the respective axially adjacent recesses (4) of a profile bar (1) differ from one another with respect to their shape such that a slight offset of the corresponding contact surface (6) with the profile bar ( 1) results.
3. Verfahren zur Fierstellung einer zylindrischen Siebvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Aussparungen (4) mittels Laserschneiden, Drahterodieren o.ä an der Innen- oder Außenseite des jeweiligen Stabhalters (3) herausgeschnitten werden. 3. A method for Fierstellung a cylindrical screening device according to claim 1 or 2, characterized in that the recesses (4) by means of laser cutting, wire erosion or the like on the inside or outside of the respective rod holder (3) are cut out.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass der Beginn des Schnitts zumindest zweier Stabhalter (3) des Siebzylinders versetzt zueinander angeordnet ist. 4. The method according to claim 3, characterized in that the beginning of the section of at least two rod holder (3) of the screen cylinder is offset from one another.
5. Verfahren nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass der Beginn des Schnitts der jeweils benachbarten Stabhalter (3) des Siebzylinders versetzt zueinander angeordnet ist. 5. The method according to claim 3 or 4, characterized in that the beginning of the section of the respectively adjacent rod holder (3) of the screen cylinder is offset from one another.
6. Verfahren zur Herstellung einer zylindrischen Siebvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass über radial von außen einwirkende Kräfte ein dauerhafter Formschluss zwischen den Profilstäben (1 ) und den Aussparungen (4) erzeugt wird. 6. A method for producing a cylindrical screening device according to one of the preceding claims, characterized in that on radially acting from the outside forces a permanent positive connection between the profile bars (1) and the recesses (4) is generated.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass die Innenseite der Stabhalter (3) während der radialen Krafteinwirkung keinen Stütz- oder Biegekräften ausgesetzt wird. 7. The method according to claim 6, characterized in that the inside of the rod holder (3) is exposed during the radial force no supporting or bending forces.
8. Verfahren nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die radiale Krafteinwirkung über mehrere, radial von außen einwirkende Stempel8. The method according to claim 6 or 7, characterized in that the radial force via a plurality of radially acting from the outside punch
(5) erfolgt. (5).
9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass die Stempel (5) vorzugsweise mit gleichem Abstand über den Umfang des Siebzylinders verteilt angeordnet sind. 9. The method according to claim 8, characterized in that the punches (5) are preferably distributed over the circumference of the screen cylinder at the same distance.
10. Verfahren nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass die Aussparungen (4) nur auf der Innenseite der Stabhalter (3) vorhanden sind und die radiale Krafteinwirkung auf die Stabhalter (3) erfolgt. 10. The method according to any one of claims 6 to 9, characterized in that the recesses (4) only on the inside of the rod holder (3) are present and the radial force acting on the rod holder (3).
11. Verfahren nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass die Aussparungen (4) nur auf der Außenseite der Stabhalter (3) vorhanden sind und die radiale Krafteinwirkung auf die Profilstäbe (1 ) erfolgt. 11. The method according to any one of claims 6 to 9, characterized in that the recesses (4) only on the outside of the rod holder (3) are present and the radial force acting on the profile bars (1).
12.Verfahren nach einem der Ansprüche 8 bis 11 , dadurch gekennzeichnet, dass die in Pressrichtung weisende Pressfläche der Stempel (5) senkrecht zur Zylinderachse (2) von einem Kreisabschnitt gebildet wird, dessen Radius dem Außenradius der fertigen Siebvorrichtung entspricht. 12.Verfahren according to any one of claims 8 to 11, characterized in that the pointing in the pressing direction pressing surface of the punch (5) perpendicular to Cylinder axis (2) is formed by a circular section whose radius corresponds to the outer radius of the finished screening device.
EP18789112.2A 2017-12-13 2018-10-17 Screen cylinder Active EP3723916B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017129765.0A DE102017129765B3 (en) 2017-12-13 2017-12-13 screen cylinder
PCT/EP2018/078316 WO2019115060A1 (en) 2017-12-13 2018-10-17 Screen cylinder

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EP3723916A1 true EP3723916A1 (en) 2020-10-21
EP3723916B1 EP3723916B1 (en) 2022-12-07

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DE (1) DE102017129765B3 (en)
FI (1) FI3723916T3 (en)
WO (1) WO2019115060A1 (en)

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DE102019107261B3 (en) * 2019-03-21 2020-03-26 Voith Patent Gmbh SCREENING PROCESS
DE102019107693A1 (en) * 2019-03-26 2020-10-01 Voith Patent Gmbh Pressure sorter

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DE4435538C2 (en) 1994-10-05 1996-10-02 Voith Gmbh J M Process for the production of a flat screen
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 (en) 2006-02-22 2007-08-23 Voith Patent Gmbh Producing a screen for use in a papermaking pressure sorter comprises inserting profile bars into peripheral recesses in a bar holder and forming the holder into a ring with the recesses on the inside
DE102013224528B3 (en) * 2013-11-29 2014-07-24 Voith Patent Gmbh Method for manufacturing cylindrical sieve device, involves inserting profile bars into recesses, where diameter of bar holder is reduced through forces acting radially from outside to positive locking between profile bars and recesses

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DE102017129765B3 (en) 2018-09-20
EP3723916B1 (en) 2022-12-07
FI3723916T3 (en) 2023-03-20
WO2019115060A1 (en) 2019-06-20

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