EP0837178B1 - Process for making screens and screen obtained by this method - Google Patents

Process for making screens and screen obtained by this method Download PDF

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Publication number
EP0837178B1
EP0837178B1 EP97114817A EP97114817A EP0837178B1 EP 0837178 B1 EP0837178 B1 EP 0837178B1 EP 97114817 A EP97114817 A EP 97114817A EP 97114817 A EP97114817 A EP 97114817A EP 0837178 B1 EP0837178 B1 EP 0837178B1
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EP
European Patent Office
Prior art keywords
screen
process according
supports
strips
profiled bars
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Expired - Lifetime
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EP97114817A
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German (de)
French (fr)
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EP0837178A1 (en
Inventor
Werner Lange
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Voith Patent GmbH
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Lange Werner
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    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/496—Multiperforated metal article making
    • Y10T29/49604—Filter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming

Definitions

  • the invention relates to a method according to the preamble of claim 1 and a Such a method and itself have become known from US Pat. No. 2,588,533 A.
  • a sieve produced in this way can e.g. be a strainer basket in pressure sorters the pulp and paper industry is used to the fibrous suspension to be treated in a kind of re-screening.
  • non-fibers are said to be Contamination due to their size retained on a screen element and then be deposited.
  • the fibers can together with some of the water Pass sorting openings.
  • There are other uses of such devices e.g. around to fractionate fiber-containing suspensions according to the fiber length or to e.g. to let unwanted fines through the sieve element and the fibers hold back.
  • the screen element inserts are called screen baskets if they rotationally symmetrical, e.g. are cylindrical. To clog the Preventing sorting openings will usually move close to them Used reamer. Sieves which are produced by the method according to the invention, can also be used outside of the pulp and paper industry.
  • sorting openings for the seven.
  • Man distinguishes between essentially round openings and elongated ones, the elongated openings in the extreme case are gaps that extend over the entire axial extent the sieve baskets run.
  • the manufacturing processes are at the sorting openings adapted, which is why they are often essential for perforated screen baskets and slotted screen baskets differentiate.
  • Modern manufacturing processes have already been found for slotted screens in which the sorting openings, i.e. the gaps, are arranged in parallel Rods are formed. However, this procedure is still due to the large number of Bars very expensive.
  • the sorting openings are generally known through Methods such as Drilling or electrical erosion, placed in a sheet metal plate.
  • Drilling or electrical erosion placed in a sheet metal plate.
  • Stamped sheets are used in special cases. Even if the production processes rationalized by automatically working machines, especially the boring mills they are still quite expensive.
  • the invention has for its object to provide a method for producing sieves and a sieve create, with which the costs can be reduced without the quality deteriorating becomes.
  • the effort involved in the production of screens of different sizes should also be be small.
  • Such sieve strips are easier to drill than the complete sieve plates because they are narrower and can be easily machined in a relatively small boring machine.
  • a high degree of automation is possible in the manufacture and assembly of the parts. In in many cases they can have a smaller wall thickness due to the supporting profile bars have as perforated sieves or sieve shells formed from one piece. It is also important, that depending on the requirement and the size of the throughput in practice of different sizes Flat sieves or sieve baskets are required. While according to the state of the art manufactured strainer baskets of different sizes large and complex Manufacturing plants may require in the inventive method same plant sieve baskets of different diameters and different Height. The same applies to flat screens of different sizes.
  • Fig. 1 you can see the components that are used to manufacture the invention Siebes are needed in an already assembled arrangement, but before Deformation step.
  • the sieve strips 2 contain on their long sides 4 over their longitudinal extent shaped surfaces 5. These are here inclined planes, which are located laterally on the elevations 9 on the sieve strips are located.
  • the profile bars 1 contain mutually opposite grooves 8, which in essentially the above-mentioned shaped surfaces 5 of the sieve strips 2 complementary correspond. In this way there is a form-fit connection between the sieve strips and the profile bars possible.
  • the profile bars 1 are in turn with a joining contour 10 provided, drawn here below, and point at the opposite of the joining contour Page 10, the top, elevations 11.
  • the one, partially drawn here 3 has upwardly open recesses 6 which are at a distance a from one another are introduced. In these recesses 6 are the profile bars 1 with the help of their Anchored contour 10.
  • the distance a and the width b of the sieve strips 2 are so chosen that a close-fitting bond between sieve strips and profile bars arises.
  • Fig. 2 shows a variant in which the profile bars 1 on the joining contour 10th have an elevation 11 on the opposite side of the head, the upper edge of which is chamfered and which takes the angle ⁇ to the top 12 of the adjacent sieve strip. It is useful that the top of the profile bar and the top 12 of the Sieve strip on the scraper side of the sieve, with the scraper side what is meant is, on which - as already mentioned at the beginning - a scraper is moved past. Such bevels have in cooperation with the reamer and the inflowing suspension has a turbulence-increasing effect, which mostly leads to Keeping the sorting openings clear is an advantage.
  • the bevel is like this chosen that, seen in the direction of the scraper movement (arrow R), the flow from the Deflects the surface of the sieve strips.
  • Fig. 2 includes a Sieve strips, viewed in the transverse direction, two rows of sorting openings. How many such rows in the transverse direction of the sieve strips depends on the later operating conditions under which the sieve produced according to the invention should be used from.
  • the design of the head side on the profile bars 1 depends on the Operating conditions of the sieve. As already mentioned, measures can be taken at the Head side lead to desired turbulence, which improve the function of the sieve. Therefore, these profile bars are both a carrying function for the sieve strips and also a hydraulic function, especially because of the possibility of design of the headboard. Cases are conceivable in which the head part is kept as small as possible is so that it essentially adjusts to the course of the upper edge of the sieve. Design options are available for this purpose within the scope of the invention. For example, can also, but does not have to be reversed, as shown in Fig. 3, the guide geometry. i.e. that the sieve strips 2 'contain grooves 13 and the profile bars 1' projections 14th
  • Fig. 4 shows a perspective view of the example of an invention manufactured arcuate sieve as a partial view. It can become a strainer or too belong to a sieve cylinder (sieve basket). Because the necessary for the production of the sieve Deformation step has taken place, you can see the final arc shape.
  • Fig. 5 is similar in some respects to Fig. 3, but in contrast to this already completes this shaped sieve.
  • Profile bars 1, sieve strips 2 and carrier 3 are through Residual stresses (arrows F) are positively connected to each other, whereby here has formed the shape of a flat plane screen.

Abstract

To produce a sieve, sieve strips (2) are produced with openings (7) for sorting the fibre suspension. The long sides (4) with identical shape surfaces (5) along their length extension. At least two bar carriers have open recesses (6) at one side, at a given gap (a). Profile rods (1) are made, where the profile at the foot has a joint contour (10) to fit into the carrier recess (6). The sides are profiled with grooves (8) or projections (9), to fit into the shape surfaces (5) at the strips (2). The profile rods (1) are positioned in the carrier (3) recesses (6), parallel to each other, by laying or sliding into place, with the sieve strips (2) parallel to each other between them. The carriers (3) are manipulated into their final shape that, at the same time, distorts the mountings for the profile rods (1) and clamps them in place. Also claimed is a sieve where the carrier (3) is bent into a closed ring, with durably bonded butting ends, to give a cylindrical sieve body, or it is bent into an arc to give a sieve on a circle segment, or the carriers are flat to give a flat sieve body.

Description

Die Erfindung betrifft ein Verfahren gemäß dem Oberbegriff des Anspruchs 1 sowie ein Sich gemäß dem Oberbegriff des Anspruchs 17. Ein derartiges Verfahren und Sich sind aus der US-2 588 533 A bekannt geworden. Ein hierdurch hergestelltes Sieb kann z.B. ein Siebkorb sein, der in Drucksortierern der Zellstoff- und Papierindustrie eingesetzt wird, um die faserstoffhaltige Suspension in einer Art Nachsiebung zu behandeln. Dabei sollen in den meisten Fällen faserfremde Verunreinigungen aufgrund ihrer Größe an einem Siebelement zurückgehalten und dann abgeschieden werden. Die Fasern können dabei zusammen mit einem Teil des Wassers die Sortieröffnungen passieren. Es gibt auch andere Anwendungen solcher Apparate, z.B. um faserstoffhaltige Suspensionen nach der Faserlänge zu fraktionieren oder auch um z.B. unerwünschte Feinststoffe durch das Siebelement passieren zu lassen und die Fasern zurückzuhalten. Grundsätzlich sind solche Maschinen weithin bekannt und werden oft eingesetzt. Die Siebelementeinsätze werden Siebkörbe genannt, wenn sie rotationssymmetrisch, z.B. zylindrisch aufgebaut sind. Um ein Verstopfen der Sortieröffnungen zu verhindern, werden meist sich dicht an ihnen vorbeibewegende Räumer verwendet. Siebe, die nach dem erfindungsgemäßen Verfahren hergestellt sind, können auch außerhalb der Zellstoff- und Papierindustrie Verwendung finden.The invention relates to a method according to the preamble of claim 1 and a Such a method and itself have become known from US Pat. No. 2,588,533 A. A sieve produced in this way can e.g. be a strainer basket in pressure sorters the pulp and paper industry is used to the fibrous suspension to be treated in a kind of re-screening. In most cases, non-fibers are said to be Contamination due to their size retained on a screen element and then be deposited. The fibers can together with some of the water Pass sorting openings. There are other uses of such devices, e.g. around to fractionate fiber-containing suspensions according to the fiber length or to e.g. to let unwanted fines through the sieve element and the fibers hold back. Basically, such machines are widely known and are often used. The screen element inserts are called screen baskets if they rotationally symmetrical, e.g. are cylindrical. To clog the Preventing sorting openings will usually move close to them Used reamer. Sieves which are produced by the method according to the invention, can also be used outside of the pulp and paper industry.

Man kann davon ausgehen, daß derartige Maschinen und die darin verwendeten Siebe ihren Zweck in der Regel erfüllen. Wie überall in der Industrie üblich, wird jedoch die ökonomische Seite solcher Trennprozesse sehr wichtig erachtet, weshalb es immer wieder Versuche gegeben hat, die - auch als Verschleißteile anzusehenden - Siebe zu verbilligen. Dabei handelt es sich bei diesen Teilen nämlich um recht teure Gegenstände, die oftmals in bestimmten Abständen zu ersetzen sind. Daher ist das besondere Bemühen der Hersteller solcher Siebe darauf gerichtet, diese möglichst preiswert herstellen zu können. It can be assumed that such machines and the screens used therein usually serve their purpose. As is common throughout the industry, however The economic side of such separation processes is very important, which is why it always does has again attempted to close the screens, which can also be regarded as wearing parts cheaper. These parts are really expensive items, which are often to be replaced at certain intervals. Hence the special effort the manufacturer of such screens aims to produce them as cheaply as possible can.

Bekanntlich gibt es bei den Sieben unterschiedliche Formen der Sortieröffnungen. Man unterscheidet zwischen im wesentlichen runden Öffnungen und länglichen, wobei die länglichen Öffnungen im Extremfall Spalte sind, die über die gesamte Axialerstreckung der Siebkörbe verlaufen. Die Herstellungsverfahren sind an die Sortieröffnungen angepaßt, weshalb sie sich oft für Lochsiebkörbe und Spaltsiebkörbe wesentlich unterscheiden. Bei Spaltsieben sind bereits moderne Herstellungsverfahren gefunden worden, bei denen die Sortieröffnungen, also die Spalte, zwischen parallel angeordneten Stäben gebildet werden. Dieses Verfahren ist aber nach wie vor wegen der Vielzahl der Stäbe sehr aufwendig.As is known, there are different types of sorting openings for the seven. Man distinguishes between essentially round openings and elongated ones, the elongated openings in the extreme case are gaps that extend over the entire axial extent the sieve baskets run. The manufacturing processes are at the sorting openings adapted, which is why they are often essential for perforated screen baskets and slotted screen baskets differentiate. Modern manufacturing processes have already been found for slotted screens in which the sorting openings, i.e. the gaps, are arranged in parallel Rods are formed. However, this procedure is still due to the large number of Bars very expensive.

Bei Lochsieben werden die Sortieröffnungen in der Regel durch an sich bekannte Verfahren, wie z.B. Bohren oder Elektro-Erosion, in eine Blechplatte eingebracht. In speziellen Fällen werden gestanzte Bleche verwendet. Auch wenn die Produktionsabläufe durch automatisch arbeitende Maschinen, insbesondere der Bohrwerke, rationalisiert werden konnten, sind sie immer noch recht teuer.In the case of perforated sieves, the sorting openings are generally known through Methods such as Drilling or electrical erosion, placed in a sheet metal plate. In Stamped sheets are used in special cases. Even if the production processes rationalized by automatically working machines, especially the boring mills they are still quite expensive.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Herstellung von Sieben sowie ein Sieb zu schaffen, mit dem die Kosten reduziert werden können, ohne daß die Qualität schlechter wird. Auch soll der Aufwand bei der Produktion von Sieben von unterschiedlicher Größe gering sein.The invention has for its object to provide a method for producing sieves and a sieve create, with which the costs can be reduced without the quality deteriorating becomes. The effort involved in the production of screens of different sizes should also be be small.

Diese Aufgabe wird durch die im Kennzeichen des Anspruchs 1 bzw. 17 genannten Merkmale gelöst.This object is achieved by the features mentioned in the characterizing part of claim 1 and 17, respectively solved.

Derartige Siebstreifen sind einfacher zu bohren als die kompletten Siebbleche, da sie schmaler sind und leicht in einem relativ kleinen Bohrwerk bearbeitet werden können. Bei Herstellung und Montage der Teile ist ein hoher Automatisierungsgrad möglich. In vielen Fällen können sie wegen der mittragenden Profilstäbe eine geringere Wandstärke haben als aus einem Stück geformte, gelochte Siebe oder Siebmäntel. Wichtig ist auch, daß je nach Anforderung und Größe des Durchsatzes in der Praxis unterschiedlich große Plansiebe oder Siebkörbe erforderlich sind. Während nach dem Stand der Technik hergestellte Siebkörbe unterschiedlicher Größen große und aufwendige Fertigungsanlagen erfordern, können bei dem erfindungsgemäßen Verfahren auf derselben Anlage Siebkörbe unterschiedlichen Durchmessers und unterschiedlicher Höhe hergestellt werden. Ähnliches gilt auch für ebene Siebe unterschiedlicher Größe.Such sieve strips are easier to drill than the complete sieve plates because they are narrower and can be easily machined in a relatively small boring machine. A high degree of automation is possible in the manufacture and assembly of the parts. In in many cases they can have a smaller wall thickness due to the supporting profile bars have as perforated sieves or sieve shells formed from one piece. It is also important, that depending on the requirement and the size of the throughput in practice of different sizes Flat sieves or sieve baskets are required. While according to the state of the art manufactured strainer baskets of different sizes large and complex Manufacturing plants may require in the inventive method same plant sieve baskets of different diameters and different Height. The same applies to flat screens of different sizes.

Werden mit Hilfe des erfindungsgemäßen Verfahrens Siebkörbe oder Siebschalen hergestellt, entfällt wegen des Aufbaus aus meheren Siebstreifen das problematische Biegen von gelochten, großflächigen Siebblechen, welches dazu führen kann, daß die Siebkörbe nicht ausreichend präzise herstellbar sind.Using the method according to the invention, sieve baskets or sieve trays manufactured, the problematic is eliminated due to the structure of several sieve strips Bending perforated, large-area sieve plates, which can lead to the Sieve baskets cannot be manufactured with sufficient precision.

Die Erfindung und ihre Vorteile werden erläutert anhand von Zeichnungen. Dabei zeigen:

Fig. 1
Teil eines erfindungsgemäß hergestellten Siebes während der Herstellung;
Fig. 2+3
jeweils Varianten mit unterschiedlichen Profilstäben;
Fig. 4
perspektivisch: Teil eines erfindungsgemäß hergestellten Siebes nach Durchführung der Verformung;
Fig. 5
Teilansicht eines durch das Verfahren hergestellten Plansiebes.
The invention and its advantages are explained with reference to drawings. Show:
Fig. 1
Part of a sieve produced according to the invention during manufacture;
Fig. 2 + 3
Variants with different profile bars;
Fig. 4
perspective: part of a sieve produced according to the invention after the deformation has been carried out;
Fig. 5
Partial view of a plane screen produced by the method.

Auf der Fig. 1 erkennt man die Bauteile, die zur Herstellung des erfindungsgemäßen Siebes benötigt werden in bereits gefügter Anordnung, jedoch vor dem Verformungsschritt. Dabei sieht man Siebstreifen 2 mit den bereits eingebrachten Sortieröffnungen 7, die hier beispielhaft von oben nach unten, was der geplanten Strömungsrichtung entspricht, sich konisch erweiternde Bohrungen aufweisen. Selbstverständlich sind auch andere Öffnungsformen denkbar. Die Siebstreifen 2 enthalten an ihren Längsseiten 4 über ihre Längserstreckung Formflächen 5. Diese sind hier schräge Ebenen, die sich seitlich auf den Erhebungen 9 an den Siebstreifen befinden. Die Profilstäbe 1 enthalten beidseitig gegenüberliegende Nuten 8, welche im wesentlichen den genannten Formflächen 5 der Siebstreifen 2 komplementär entsprechen. Auf diese Weise ist ein Formfügeverbund zwischen den Siebstreifen und den Profilstäben möglich. Die Profilstäbe 1 ihrerseits sind mit einer Fügekontur 10 versehen, hier unten gezeichnet, und weisen an der der Fügekontur entgegengesetzten Seite 10, der Kopfseite, Erhebungen 11 auf. Der eine, hier teilweise gezeichnete Träger 3 hat nach oben hin offene Ausnehmungen 6, die in einem Abstand a zueinander eingebracht sind. In diese Ausnehmungen 6 sind die Profilstäbe 1 mit Hilfe ihrer Fügekontur 10 verankert. Der Abstand a und die Breite b der Siebstreifen 2 sind so gewählt, daß ein eng anliegender Verbund zwischen Siebstreifen und Profilstäben entsteht.On Fig. 1 you can see the components that are used to manufacture the invention Siebes are needed in an already assembled arrangement, but before Deformation step. You can see sieve strips 2 with the ones already inserted Sorting openings 7, which are exemplary from top to bottom of what is planned Direction of flow corresponds, have conically widening bores. Of course, other opening shapes are also conceivable. The sieve strips 2 contain on their long sides 4 over their longitudinal extent shaped surfaces 5. These are here inclined planes, which are located laterally on the elevations 9 on the sieve strips are located. The profile bars 1 contain mutually opposite grooves 8, which in essentially the above-mentioned shaped surfaces 5 of the sieve strips 2 complementary correspond. In this way there is a form-fit connection between the sieve strips and the profile bars possible. The profile bars 1 are in turn with a joining contour 10 provided, drawn here below, and point at the opposite of the joining contour Page 10, the top, elevations 11. The one, partially drawn here 3 has upwardly open recesses 6 which are at a distance a from one another are introduced. In these recesses 6 are the profile bars 1 with the help of their Anchored contour 10. The distance a and the width b of the sieve strips 2 are so chosen that a close-fitting bond between sieve strips and profile bars arises.

Fig. 2 zeigt eine Variante, bei der die Profilstäbe 1 auf der der Fügekontur 10 gegenüberliegenden Kopfseite eine Erhebung 11 aufweisen, deren Oberkante abgeschrägt ist und die zur Oberseite 12 des benachbarten Siebstreifens den Winkel α einnimmt. Zweckmäßig ist es, daß die Kopfseite des Profilstabes sowie die Oberseite 12 des Siebstreifens auf der Räumerseite des Siebes liegen, wobei mit Räumerseite die Seite gemeint ist, auf der - wie bereits eingangs erwähnt - ein Räumer vorbeibewegt wird. Derartige Abschrägungen haben im Zusammenwirken mit dem Räumer und der anströmenden Suspension eine turbulenzerhöhende Wirkung, was zumeist zur Freihaltung der Sortieröffnungen von Vorteil ist. In der Regel wird die Abschrägung so gewählt, daß sie, in Räumerbewegungsrichtung (Pfeil R) gesehen, die Strömung von der Oberfläche der Siebstreifen weglenkt. Bei dem in Fig. 2 gezeigten Beispiel enthält ein Siebstreifen, in Querrichtung betrachtet, zwei Reihen von Sortieröffnungen. Wieviele solcher Reihen in Querrichtung der Siebstreifen angeordnet werden, hängt von den späteren Einsatzbedingungen, unter denen das erfindungsgemäß hergestellte Sieb benutzt werden soll, ab.Fig. 2 shows a variant in which the profile bars 1 on the joining contour 10th have an elevation 11 on the opposite side of the head, the upper edge of which is chamfered and which takes the angle α to the top 12 of the adjacent sieve strip. It is useful that the top of the profile bar and the top 12 of the Sieve strip on the scraper side of the sieve, with the scraper side what is meant is, on which - as already mentioned at the beginning - a scraper is moved past. Such bevels have in cooperation with the reamer and the inflowing suspension has a turbulence-increasing effect, which mostly leads to Keeping the sorting openings clear is an advantage. As a rule, the bevel is like this chosen that, seen in the direction of the scraper movement (arrow R), the flow from the Deflects the surface of the sieve strips. In the example shown in Fig. 2, includes a Sieve strips, viewed in the transverse direction, two rows of sorting openings. How many such rows in the transverse direction of the sieve strips depends on the later operating conditions under which the sieve produced according to the invention should be used from.

Die Ausgestaltung der Kopfseite an den Profilstäben 1 richtet sich nach den Einsatzbedingungen des Siebes. Wie bereits erwähnt, können Maßnahmen an der Kopfseite zu gewünschten Turbulenzen führen, die die Funktion des Siebes verbessern. Daher fällt diesen Profilstäben sowohl eine Tragefunktion für die Siebstreifen zu, als auch eine hydraulische Funktion, insbesondere wegen der Möglichkeit zur Ausgestaltung des Kopfteiles. Es sind Fälle denkbar, bei denen der Kopfteil möglichst klein gehalten wird, so daß er sich im wesentlichen an den Verlauf der Oberkante des Siebes angleicht. Hierzu sind im Rahmen der Erfindung Gestaltungsmöglichkeiten vorhanden. Z.B. kann auch, muß aber nicht, wie in Fig. 3 gezeigt, die Führungsgeometrie umgekehrt werden. d.h. daß die Siebstreifen 2' Nuten 13 enthalten und die Profilstäbe 1' Vorsprünge 14.The design of the head side on the profile bars 1 depends on the Operating conditions of the sieve. As already mentioned, measures can be taken at the Head side lead to desired turbulence, which improve the function of the sieve. Therefore, these profile bars are both a carrying function for the sieve strips and also a hydraulic function, especially because of the possibility of design of the headboard. Cases are conceivable in which the head part is kept as small as possible is so that it essentially adjusts to the course of the upper edge of the sieve. Design options are available for this purpose within the scope of the invention. For example, can also, but does not have to be reversed, as shown in Fig. 3, the guide geometry. i.e. that the sieve strips 2 'contain grooves 13 and the profile bars 1' projections 14th

Fig. 4 zeigt in perspektivischer Darstellung das Beispiel eines erfindungsgemäß hergestellten bogenförmigen Siebes als Teilansicht. Es kann zu einer Siebschale oder zu einem Siebzylinder (Siebkorb) gehören. Da der zur Herstellung des Siebes notwendige Verformungsschritt erfolgt ist, erkennt man die endgültige Bogenform.Fig. 4 shows a perspective view of the example of an invention manufactured arcuate sieve as a partial view. It can become a strainer or too belong to a sieve cylinder (sieve basket). Because the necessary for the production of the sieve Deformation step has taken place, you can see the final arc shape.

Fig. 5 ähnelt in manchem der Fig. 3, stellt aber im Gegensatz zu dieser das bereits fertig geformte Sieb dar. Profilstäbe 1, Siebstreifen 2 und Träger 3 sind durch Eigenspannungen (Pfeile F) formschlüssig fest miteinander verbunden, wobei sich hier die Form eines ebenen Plansiebes gebildet hat.Fig. 5 is similar in some respects to Fig. 3, but in contrast to this already completes this shaped sieve. Profile bars 1, sieve strips 2 and carrier 3 are through Residual stresses (arrows F) are positively connected to each other, whereby here has formed the shape of a flat plane screen.

Nicht ausdrücklich dargestellt sind solche Maßnahmen, mit denen an den Kontaktflächen zusätzliche Verbindungen durch Löten, Kleben oder Schweißen hergestellt werden. Die Maßnahmen selbst sind dem Fachmann an sich bekannt. Dadurch läßt sich in schwierigen Anwendungsfällen die Festigkeit des Siebes weiter erhöhen.Such measures are not expressly shown with those on the contact surfaces additional connections can be made by soldering, gluing or welding. The Measures themselves are known to the person skilled in the art. This allows in difficult applications further increase the strength of the sieve.

Das im Vorstehenden beschriebene Sieb eignet sich insbesonders zum Aufbau eines Sichters zum Sortieren von Papierstoffsuspensionen. Dabei wechseln sich

  • in Umfangsrichtung gesehen Siebstreifen (2) mit Profilstäben (1) ab.
  • Die Siebstreifen (2) weisen eine Vielzahl von Sortieröffnungen (7) auf und die Profilstäbe (1) ragen über die angeströmte Fläche der Siebstreifen (2) hinaus.
The sieve described above is particularly suitable for building a sifter for sorting pulp suspensions. This changes
  • seen in the circumferential direction from sieve strips (2) with profile bars (1).
  • The sieve strips (2) have a multiplicity of sorting openings (7) and the profiled bars (1) protrude beyond the flow area of the sieve strips (2).

Claims (21)

  1. Process for the production of screens comprising a plurality of screening openings (7), in which screen strips (2, 2') with screening openings (7) are produced, the screen strips being provided on their longitudinal sides (4) with forming surfaces (5, 5') which are identical over their longitudinal extent, characterised by the following steps:
    at least two strip-shaped supports (3) are provided on one side with recesses (6) with a specific spacing (a) open towards this side,
    profiled bars (1, 1') are produced, the profile of which has a joining contour (10) on one side (bottom) substantially complementary to the recesses (6) in the strip-shaped supports (3) and is moreover provided on either side with opposing grooves (8) or projections (14) at least partially complementary to those of the forming surfaces (5, 5') of the screen strips (2, 2'),
    the profiled bars (1, 1') are inserted or slid into the recesses (6) in the supports (3) in parallel with one another,
    the screen strips (2, 2') are slid between the profiled bars (1, 1') in parallel with one another,
    the supports (3) are brought to their final shape by deformation, the profiled bars (1, 1') inserted in a positive manner being clamped as a result of the deformation.
  2. Process according to claim 1, characterised in that the recesses (6) in the strip-shaped supports (3) are at the same spacing (a) throughout and the screen strips (2, 2') have the same width (b) throughout.
  3. Process according to claim 1 or 2, characterised in that the profile of the profiled bars (1, 1') is provided on the side (top) opposite the joining contour (10) with a protuberance (11) extending beyond the groove (8) or the projection (14).
  4. Process according to claim 3, characterised in that the protuberance (11) is inclined at an angle α of between 0 and 30° relative to the top (12) of the screen strips (2) as viewed in the direction of movement (R) of the scraper.
  5. Process according to claim 1, 2, 3 or 4, characterised in that the forming surfaces (5) on the sides of the screen strips (2) are formed by protuberances (9) and the profiled bars (1) have grooves (8) complementary thereto.
  6. Process according to claim 1, 2, 3 or 4, characterised in that the forming surfaces (5') of the screen strips (2') are formed by grooves (13) and the profiled bars (1') contain projections (14) complementary thereto.
  7. Process according to one of the preceding claims, characterised in that the screen strips (2, 2') contain a plurality of rows of screening openings (7) as viewed in the transverse direction thereof.
  8. Process according to claim 7, characterised in that the screen strips (2, 2') each contain only one row of screening openings (7) as viewed in the transverse direction thereof.
  9. Process according to one of the preceding claims, characterised in that the supports (3) are bent into annular segments by plastic deformation.
  10. Process according to one of claims 1 to 8, characterised in that the supports (3) are bent into self-contained rings by plastic deformation.
  11. Process according to claim 10, characterised in that the abutting surfaces of the supports (3) are permanently joined together, e.g. by soldering or welding.
  12. Process according to claim 9, 10 or 11, characterised in that the centre line of curvature is situated on the side of the screen strips (2, 2') when the supports (3) are deformed.
  13. Process according to one of claims 1 to 8, characterised in that the supports (3) are brought to their final shape by elastic recovery once the supports (3), screen strips (2, 2') and profiled bars (1, 1') have been joined together.
  14. Process according to one of the preceding claims, characterised in that the screening openings (7) are holes with a diameter of between 1 and 6 mm.
  15. Process according to one of the preceding claims, characterised in that a clamped joint is also produced between the forming surfaces of the screen strips (2, 2') and the profiled bars (1, 1') by deformation of the supports (3).
  16. Process according to one of the preceding claims, characterised in that at least part of each clamped joint is additionally reinforced by a permanent joint, e.g. soldering.
  17. Screen comprising a plurality of screening openings (7) produced by the process according to one of the preceding claims, in which the screening openings (7) are situated in parallel screen strips (2, 2') provided on their sides with forming surfaces (5, 5'), characterised in that profiled bars (1) are situated in parallel on screen strips (2, 2') adjacent to the forming surfaces (5, 5') and have contact surfaces which match the forming surfaces of the screen strips and at least partially form a positive connection with the forming surfaces, the profiled bars (1, 1') projecting beyond the screen strips (2, 2') on at least one side where they are at least partially clamped in a positive manner in at least two supports (3), to which end the support (3) is provided at the appropriate points with recesses (6) for the projecting parts of the profiled bars (1, 1').
  18. Screen according to claim 17, characterised in that the supports (3) form a complete circular ring with abutting surfaces permanently joined together, resulting in a cylindrical screen basket.
  19. Screen according to claim 17, characterised in that the supports (3) form a circular-ring section, resulting in a cylindrical screen shell.
  20. Screen according to claim 17, characterised in that the supports (3) are flat, resulting in a flat screen.
  21. Screen according to one of claims 17 to 20, characterised in that it is used to form a separator for screening pulp suspensions, wherein
    a) screen strips (2) alternate with profiled bars (1) as viewed in the circumferential direction,
    b) the screen strips (2) have a plurality of screening openings (7) and
    c) the profiled bars (1) project beyond the surfaces of the screen strips (2) against which the suspension flows.
EP97114817A 1996-08-30 1997-08-27 Process for making screens and screen obtained by this method Expired - Lifetime EP0837178B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19635189A DE19635189C2 (en) 1996-08-30 1996-08-30 Process for the production of sieves
DE19635189 1996-08-30

Publications (2)

Publication Number Publication Date
EP0837178A1 EP0837178A1 (en) 1998-04-22
EP0837178B1 true EP0837178B1 (en) 2001-12-19

Family

ID=7804182

Family Applications (1)

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EP97114817A Expired - Lifetime EP0837178B1 (en) 1996-08-30 1997-08-27 Process for making screens and screen obtained by this method

Country Status (5)

Country Link
US (1) US6092286A (en)
EP (1) EP0837178B1 (en)
AT (1) ATE211194T1 (en)
DE (2) DE19635189C2 (en)
ES (1) ES2170309T3 (en)

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Also Published As

Publication number Publication date
EP0837178A1 (en) 1998-04-22
ATE211194T1 (en) 2002-01-15
DE19635189A1 (en) 1998-03-05
DE19635189C2 (en) 1999-01-28
DE59705868D1 (en) 2002-01-31
ES2170309T3 (en) 2002-08-01
US6092286A (en) 2000-07-25

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