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EP1143065B1 - Screen and foil for papermaking - Google Patents

Screen and foil for papermaking Download PDF

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Publication number
EP1143065B1
EP1143065B1 EP01107055A EP01107055A EP1143065B1 EP 1143065 B1 EP1143065 B1 EP 1143065B1 EP 01107055 A EP01107055 A EP 01107055A EP 01107055 A EP01107055 A EP 01107055A EP 1143065 B1 EP1143065 B1 EP 1143065B1
Authority
EP
European Patent Office
Prior art keywords
blade
curvature
rotor
screen basket
facing
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.)
Expired - Lifetime
Application number
EP01107055A
Other languages
German (de)
French (fr)
Other versions
EP1143065A3 (en
EP1143065A2 (en
Inventor
Helmuth Dipl.Ing.Dr. Gabl
Axel Dipl.Ing. Pichler
Alexander Dipl.Ing. Gscheider
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Andritz AG
Original Assignee
Andritz AG
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 Andritz AG filed Critical Andritz AG
Priority to AT01107055T priority Critical patent/ATE312230T1/en
Publication of EP1143065A2 publication Critical patent/EP1143065A2/en
Publication of EP1143065A3 publication Critical patent/EP1143065A3/en
Application granted granted Critical
Publication of EP1143065B1 publication Critical patent/EP1143065B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the present invention relates to a novel sorter according to the Preamble of claim 1.
  • Provided fiber, especially wood material, from disturbing Particulate contaminants are in various embodiments become known and are used worldwide in the paper industry.
  • Sorters are known in which arranged on a rotor wing in Rotation direction of aircraft wings have similar cross-sectional shape, in the direction of rotation of a bead-like curve goes out, backwards converges and ends in a narrow-drop shape.
  • Sorters is the one for the passage of the pulp particle suspension provided screen basket facing surface of the wings curved in the manner that the radial distance between the functionally effective wing surface and the facing Siebkorbction in the leading part of the wing first up to reduced to a minimum. After a short, about constant Minimum distance to the facing Siebkorb realization increases the radial distance to back end or the end edge of the wing back to.
  • sorters two basic types of sorters exist, namely on the one hand sorter with a from inside with Sorting material suspension feedable screen basket and inside the screen basket lying wings, so “centrifugal sorter”, and on the other hand sorter with rotating outside of the screen basket and the same at a small distance outside swept wings, with these so-called “centripetal sorters” the sorted material is supplied to the screen basket from the outside and the discharge of the purified pulp suspension is made from the inside.
  • the present invention is based on the observation that the hitherto customary design of the screen basket-near surface of the wings in the form of a Wing area, especially in the leading area of the wing provided distance reduction between the sash and strainer, neither off From a fluidic and energetic point of view, the effectiveness of the Separation process, throughput and separation efficiency is optimal.
  • the invention thus provides a sorter as described above, the by the features cited in the characterizing part of claim 1 is characterized.
  • the curvature of the screen basket facing surface of the wing is important.
  • an improved degree of backwashing is achievable with the formation of different curvatures of the front and rear region of the individual wing in the direction of rotation, ie when the features of claim 3 have been realized.
  • the shape or shape of the wing surface various contour shapes have proven to be favorable. Corresponding features are given in claims 6 and 7, which can achieve favorable flow conditions and separation results. In the case of a stepped configuration of the contour, the steps or points need not be arranged along a straight line, but may have a concave or convex overall course.
  • the contour of the wing widening from the front side to the rear, may again have angles running towards each other in its rear third.
  • the described contour shapes of the wings also contribute to the reduction of the flow resistance as it moves through the fiber suspension.
  • the suction effect can still be increased if - as provided for in accordance with claim 6 - it is ensured that the Wing surfaces extending transversely to the direction of rotor rotation, such as strip-like Have surveys, behind each one compared to the usual Suction effect of the wing surface locally enhanced suction effect occurs.
  • the nature of the arrangement of the individual wings on the rotor can be far in Borders vary, however, are in several rows one above the other and heights and / or circumferentially offset arranged wings particularly preferred.
  • the rotor itself may be formed in one piece. It may be expedient to use an embodiment in which a plurality of individual rotor modules are assembled to form a rotor of any desired axial extent, as specified in claim 10.
  • the invention further relates to a wing according to the preamble of claim 13.
  • a wing according to the preamble of claim 13.
  • the conventional wings it is to be considered disadvantageous that they are solid and heavy, in particular because these wings are constructed wing-shaped in cross-section.
  • the said wings are inventively characterized by the features cited in the characterizing part of claim 13. With such a structure of the wings, it becomes possible to manufacture the wings in lightweight construction and to easily give the wings the desired shape, and to adapt these to different purposes.
  • FIGS. 1, 2 and 3 show schematic sectional views of sorters, respectively according to the prior art.
  • Fig. 4 shows the sectional view of a likewise the State of the art according trained rotor blade.
  • Fig. 5 shows schematically a sectional view of a wing one within the screen basket arranged rotor of a sorter according to the invention.
  • Fig. 6 shows schematically a sectional view of an outside around an inner screen basket rotating wing.
  • Figs. 7, 8 and 9 show schematically different Arrangements of wings.
  • FIGS. 10 to 16 each show plan views inventive wings with different shape contours.
  • Fig.17, 18 and 19 show attachment possibilities of wings to rotors.
  • the sorter 100 shown schematically in FIGS. 1 and 2 in a horizontal and a vertical sectional view, has a housing 5 with a feed 51 for a sorting material suspension with a discharge 52 for accepts which have been cleared of foreign particles. At the base of the housing 5 is an outlet 53 od. Like. For the removal of the separated from the sorted contaminants arranged. In the inner space 500 of the approximately barrel-like or cylindrically shaped housing 5, a cylindrically shaped screen basket 2 with holes or slot-like passage openings 204 for the purified pulp suspension is arranged concentrically.
  • a rotor 31 which is substantially rotationally paraboloidal or conical or cylindrical is rotatably mounted on a shaft 381 driven by a motor 6 about a vertical axis of rotation a3. From the rotor 300 go webs 382 in particular radially, each carrying at its Siebkorbnahen end one on the inner surface 20 of the screen basket 2 shall Concretebaren wings 3.
  • the sorted material supplied under pressure through the inlet 51 passes here into the interior 200 of the screen basket 2 which concentrically narrows more and more in its cross-section through the paraboloidal shape of the rotor 300.
  • the accept material comprising the fine-fibrous contamination-free material
  • the accept material is produced under the action of the the fiber suspension introduced pressure through the openings 204 of the screen basket 2 to the outside in the screen basket 2 surrounding the interior 500 of the housing 5 is pressed, from which the suspension is discharged via the outlet 52.
  • the openings 204 of the screen basket 2 are dimensioned such that the foreign material particles contained in the sorting material suspension, such as glass splinters, coarser sand particles, small stones, metal particles or the like, remain in the screen basket 2, in particular on its inner surface 20 in the region of the passage openings 204 lie. Without appropriate countermeasures, it would happen that the openings 204 become clogged and the passage of the foreign particle-free, fine-fiber accepts suspension would be prevented.
  • the sorter 100 shown in FIG. 3 operates according to the working principle of the sorter 100 shown in Figs. 1 and 2 inverse principle.
  • the housing 5 has a lower inlet 51 for fiber suspension to be sorted, an overhead drain 52 for the de-contaminated Pulp suspension and also a relatively high outlet 53 for Impurities on.
  • a motor 6 about the axis a3 rotatable rotor 300 arranged with a conical cross section.
  • the inner surfaces 30 'of the wings 3' rotate around the strainer basket 2 or around its outer surface 20 'at a relatively close distance.
  • the separation of Acceptance and impurities are analogous as in connection with the Figures 1 and 2 described.
  • the wings 3 ' are substantially about wing-shaped and show the above-discussed disadvantages of increased Energy consumption and not optimal backwashing and thus less effective cleaning of the screen basket 2 or exposure of the openings 204.
  • FIG. 4 shows a part of the screen basket 2 with its passage openings 204 for the accepts suspension.
  • the radial distance ar of the basket-like surface 30 of the blade 3 from the inner surface 20 of the screen basket 2 changes over the length of the wing 3.
  • the wing-wing-like in cross-section 3 has at its front edge 310 and / or in the foremost approach area 31 has a relatively large radial distance arv up. Between this starting region 31 of the blade 3 and a relatively narrow central zone 32, the radial distance ar decreases to a minimum distance arm. From the zone 32, the radial distance ar increases toward the rear region 33 or towards the end edge 330 to a maximum value arh.
  • a pressure accumulation reaching up to the zone 32 is created when the wing 3 is moved in the direction of rotation dr. Only in the wake region 33, in which the distance between the surface 30 and the surface 20 of the screen basket 2 increases, the important for the backwashing of the impurities suction effect is created.
  • the wing 3 is formed on the inside with a flat surface 3001.
  • wing 3 has a cylinder jacket-shaped surface 20 of the screen basket 2 facing, convexly curved outer surface 30.
  • the wing 3 is plate-shaped, for example, from a sheet or plastic material with a constant thickness or material thickness ms formed.
  • the inner surface 3001 is parallel to the outer surface 30 or have these two surfaces 30 and 3001 same curvature.
  • the thickness of the blade 3 is in practice about 5 to 6 mm, the diameter of the screen basket 2 is usually 400 to 3000 mm, its height about 500 up to 1500 mm.
  • FIG. 5 The small side sketches of FIG. 5 are three examples of a preferred one Design of the leading edge 310 of the wing 3 removable, the end face according to a) rectangular cross section, according to b) a similar Cross-sectional shape with rounded edges 3101 and sketch c) a Rounding off 3102 shows.
  • the wing 3 according to the invention which differs substantially from the wings according to the prior art, is positioned relative to the course of the facing surface 20 of the screen basket 2 such that the surface 30 of the wing 3 moves further and further away from its front edge 310 towards the end edge 330 20 removed or the radial distance ar increases from front to back.
  • the smallest radial distance arv is at the leading edge 310, the maximum distance arh at the rear end edge 330.
  • the radius of curvature rsk of the surface 20 of the screen basket 2 is greater than each of the two radii of curvature rf1 and rf2 of the leading portion 31 and the trailing portion 33 of the surface 30 of the blade 3.
  • the surface 30 advantageously has in the region of the front end edge 310th a nearly parallel course to the surface 20.
  • a tangential plane etf applied directly to the front region 31 in the region of the front edge 310 includes, with the radially corresponding tangential plane ets applied to the surface 20, an acute angle ⁇ of a few degrees, which is determined by the radius rf1 of the curvature in the region of the front edge 310.
  • the radial distance ar of the surface 30 increases from the minimum distance arv continuously to a maximum distance arh and by this "inclination" of the blade 3 with respect to the direction of rotation dr or with respect to the screen basket 2 is effective for the backwashing suction during the movement of the wing 3 relative to the screen basket 2 over the entire wing extension in the direction of rotation dr ensured.
  • the radius rf1 of the curvature of the front region 31 of the surface 30 is smaller than the radius rf2 of the curvature in the trailing region 33, wherein a transition region is provided in the intermediate zone 32 between the two different curvatures.
  • An edge which follows the course of a generatrix of the surface 30 between the more curved start-up region 31 and the less curved discharge region 33 of the surface 30 is not desirable.
  • the described change in the degree of curvature over the course of the Wing 3 brings beneficial changes in the flow conditions and leads in the suspension to favorable pressure changes.
  • the bends are preferably circular cylindrical, but can also be designed oval or elliptical.
  • Front edge 310 of the wing 3,3 'applied tangential plane etf an angle ⁇ from 0 to 15 °, preferably from 0 to 8 °, in particular from 0 to 2 °, with the ezs to a radially corresponding generatrix of the wing 3,3' facing Surface 20,20 'of the screen basket 2 applied tangential plane ets includes.
  • a flow-favorable course of the surface 30 and a good suction effect can be achieved.
  • This dimensioning applies to inside and / or outside the screen basket 2 encircling wings 3,3 '.
  • curvature of the screen-like area 30 of the Wing 3 in its front or leading area 31 by 5 to 20%, preferably by 10 to 15%, greater than the curvature of the facing Surface 20 of the screen basket 2 and when the curvature of the screen basket near the surface 30 of the wing 3 in their post-hurry area 33 by 0 to 9%, preferably by 0 to 4%, greater than the curvature of the surface 30 of the screen basket. 2
  • Fig. 6 shows schematically the screen basket 2 of a centripetal sorter with outside order the screen basket 2 rotating wings 3 'with surfaces 30', which has a smaller Have curvature as the outer surface 20 'of the screen basket 2 and with their convex surface 30 'of the outer surface 20' of the screen basket 2 are facing.
  • dashed lines is still hinted that the curvature of the wing 3 'in the may also be "infinite" in size, i.e. the angle ⁇ at the end edge 310 could assume the limit 0 °.
  • FIG. 7 shows a rotor 300 with height offset from each other, arranged zig-zag-shaped, inventively designed wings 3.
  • Fig. 8 is a rotor 300 arranged circumferentially offset from each other Wings 3 shown.
  • Fig. 9 shows a rotor equipped according to the invention 300 with wings arranged along a rising spiral line 3.
  • FIGS. 10 to 16 show wings 3,3 'designed according to the invention with the row according to trapezoidal, triangular and principally trapezoidal overall contour.
  • Wing 3 shown in FIG. 12 has arranged on its surface 30, at an angle ⁇ to Direction of the wing-producing ezf running, in this case approximately parallel to lower side edge 35 arranged, strip-like Verwirbelungserhebept 308th
  • elevations 308 can also groove-shaped depressions in the wing. 3 be formed.
  • the apart from the direction of rotation dr diverging side edges 35 included angle ⁇ is 20 to 60 °, preferably 25 to 50 °.
  • the approximately strip-like elevations 308 and the depressions on the surface 30 of a Wing 3 trigger 3 local vacuum vortices when moving the wing, which support the detachment of adherent foreign particles from the screen basket 2.
  • the side edges 35 are angled convexly formed, with the front, short transverse edge 310 directly subsequent sections 351 enclose the angle ⁇ with each other.
  • the Side edges 35 of the wing 3 of FIG. 14 are in the form of uniform steps 352 executed. The step-like formation of the side edges 35 brings a substantial increase in their total length and thus promotes the turbulence of Pulp suspension during the rotation of the blades 3.
  • the contour shape of the wing 3 of FIG. 15 has diverging in the front region Side edges 35, which approximately in the back third of the surface 30 after Begin to turn inside and back in two short branches Angle to each other and end with the end edge 330.
  • the wing 3 16 has dovetail-shaped contour with a short Leading edge 310 on.
  • FIG. 17 schematically wings 3, 3 'are shown, the on different manner with the outgoing from the rotor 300 arms or Webs 382 and straps 384 can be connected.
  • the wings 3,3 ' consist of bent sheet metal, in particular with a parallel to each other extending outer surface 30 and inner surface 3001.
  • Fig. 17 and 18 is at the wing 3,3 'a foot part 383 formed.
  • the foot part 383 according to FIG. 17 has an inner sleeve-shaped recess 385, into which an extension 386 of the Carrier 382 is introduced.
  • Side tabs 387 take the lateral ones Limitations 388 of the recess 385.
  • the connection between the Projection 386 and the recess 385 takes place - as indicated - with a Screw.
  • the projections 389 and 390 are - as in 384 indicated - screwed together.
  • the illustrated embodiments allow a simple exchange of Wing 3,3 'to, so that provided with such wings sorter to quickly different operating conditions can be adjusted.

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

Abstract

The assembly to sort wood and cellulose materials, for the production of paper and cardboard, has paddles rotating within a sieve body with a structured radial gap (ar) between the paddle and sieve surfaces. An assembly to sort wood and cellulose materials, comprises paddles rotating within a sieve body (2), has a radial gap between the leading end (31) of the paddles in the direction of rotation (dr) and especially the leading end point or leading edge (310) of the paddle surface (30) towards the sieve, and the facing surface (20) of the sieve body, with a minimum gap (arv) at the leading end and an increased maximum gap (arh) at the trailing zone (33) or end edge (330) of the paddle. The paddles of the rotor are arranged in rows over each other, offset by height and/or around the periphery in relation to the sorting and/or peripheral line of the sieve body. The paddles are fitted to their shafts or the rotor body (300) by screws or rivets and/or an adhesive, solder or welding, especially so that the paddles can be replaced. The tangent plane (etf) at the leading end zone or near the tip or the leading edge of the paddle, towards the sieve body, is at an angle ( alpha ) of 0-15 degrees and preferably 0-8 degrees and especially 0-2 degrees with the tangent plane (ets) on the surface of the sieve body towards the paddle at the radial working line (ezs). When the rotor (300) with the paddles is in position, within the sieve body, the paddle surface at right angles to the rotor axis has a curvature which is larger than the curvature of the sieve surface towards the paddles. If the paddles are mounted outside the sieve body, their surface curvature is smaller than the facing outer surface (20') of the sieve body. The paddles have a plate structure, with a constant thickness (ms) from the leading to the trailing ends, preferably of 2-8 mm and especially 5-6 mm. The paddle plates are of curved sheets, with parallel outer and inner surfaces. The paddle surface towards the sieve body has a stronger curvature at the leading zone at the leading tip or edge than in the trailing zones, with a stronger curvature of 5-20% and preferably 10-15% stronger than the curvature of the facing surface of the sieve body. The curvature of the trailing zones of the paddle surface towards the sieve surface is 0-4% stronger than the curvature of the facing sieve surface. The transit between the two curvature structures is at the center one-third of the longitudinal line of the paddle surface, with a steady shift from the stronger to the weaker curve line. The surface of the paddle towards the sieve is parallel to the rotor (300) axis. The end surface of the paddle surface has a narrow rectangle shape, and both leading edge corners (3101, 3102) are rounded. On a plan view, the leading end of the paddle surface, in the direction of rotation, is narrower than the trailing end, in the shape of a triangle, delta, trapezoid or swallowtail. The side edges of the paddle surface are aligned outwards and back from the leading end by an angle of 40-120 degrees and preferably 60-90 degrees . The side edges are straight, curved or stepped. The paddle surface can be fitted with spaced linear projections or recesses, pitched at an angle of 10-45 degrees and especially 15-30 degrees to the working end (esf). The projections are held in place by solder, welding or an adhesive, or recesses are machined out as grooves. The separate paddles at the rotor together form an expanding spiral configuration in the direction of rotation. The rotor (300), fitted with the paddles, forms rotor modules, with the paddles fitted by carrier bars to the shafts from the rotor center. The ratio of the minimum paddle surface/sieve surface gap to the maximum gap (arh) is 0.05-0.5 and preferably 0.1-0.3. An Independent claim is included for paddles with mountings to be fitted to the carrier bars a sleeves, openings, drillings or shoulders, or threaded holes for screw fasteners.

Description

Die vorliegende Erfindung betrifft einen neuartigen Sortierer gemäß dem Oberbegriff des Patentanspruches 1.The present invention relates to a novel sorter according to the Preamble of claim 1.

Derartige Sortieranlagen für die Trennung von für die Herstellung von Papier, Pappe u. dgl. vorgesehenem Faser-, insbesondere Holzmaterial, von störenden Verunreinigungen in Partikelform sind in verschiedenen Ausführungsformen bekannt geworden und stehen weltweit in der Papierindustrie im Einsatz.Such sorting machines for the separation of paper for the production of Cardboard & Paper Like. Provided fiber, especially wood material, from disturbing Particulate contaminants are in various embodiments become known and are used worldwide in the paper industry.

Es sind Sortierer bekannt, bei denen auf einem Rotor angeordnete Flügel in Rotationsrichtung eine Flugzeugtragflächen ähnliche Querschnittsform aufweisen, die in Drehrichtung von einer wulstartigen Rundung ausgeht, nach rückwärts hin zusammenläuft und etwa schmal-tropfenförmig endet. Bei den bekannten Sortierern ist die dem für den Durchtritt der Faserstoffteilchen-Suspension vorgesehenen Siebkorb zugewandte Fläche der Flügel in der Weise gekrümmt, dass sich der radiale Abstand zwischen der funktionswirksamen Flügelfläche und der zugewandten Siebkorbfläche im voreilenden Bereich des Flügels zuerst bis zu einem Minimum verringert. Nach einem kurzen, etwa gleichbleibenden Minimalabstand zur zugewandten Siebkorbfläche steigt der radiale Abstand zum rückwärtigen Ende bzw. zur Endkante des Flügels hin wieder an. Damit soll erreicht werden, dass im vorderen, den sich verringernden Abstand zum Siebkorb hin aufweisenden Anlaufbereich des Flügels, eine Art staudruckunterstütztes Durchquetschen der Sortiergut-Suspension durch die Öffnungen des Siebkorbes erreicht wird. Im rückwärtigen, nachlaufenden Bereich des Flügels, welcher sich von der ihm zugekehrten Siebkorbfläche in steigendem Maße entfernt, wird eine Art Sogwirkung auf das vorher schon auf die andere Seite des Siebkorbes gedrängte Suspensionsgut ausgeübt, um eine Rück- und Abspülwirkung am Siebkorb zu erreichen. Diese Sogwirkung ist bekannt und es bestand in der Fachwelt bisher die Meinung, dass eine Querschnittsform der Flügel, etwa nach Art eines schmalen, gekrümmten Tropfens, für die Effektivität des Rotors und der Flügel für eine hohe Rückspülwirkung und für die Erziehung eines möglichst geringen Strömungswiderstandes bei der Bewegung des Flügels durch den Faserbrei optimal ist. There are sorters are known in which arranged on a rotor wing in Rotation direction of aircraft wings have similar cross-sectional shape, in the direction of rotation of a bead-like curve goes out, backwards converges and ends in a narrow-drop shape. In the known Sorters is the one for the passage of the pulp particle suspension provided screen basket facing surface of the wings curved in the manner that the radial distance between the functionally effective wing surface and the facing Siebkorbfläche in the leading part of the wing first up to reduced to a minimum. After a short, about constant Minimum distance to the facing Siebkorbfläche increases the radial distance to back end or the end edge of the wing back to. So that should be achieved that in the front, the decreasing distance to the strainer basket pointing start region of the wing, a kind staudruckunterstütztes Squeezing the sorting material suspension through the openings of the screen basket is reached. In the rear, trailing area of the wing, which itself is increasingly removed from the screen basket surface facing him becomes one Type suction on the previously on the other side of the screen basket crowded Suspensionsgut exerted to a back and Abspülwirkung the To reach strainer basket. This suction effect is known and existed in the Experts have until now the opinion that a cross-sectional shape of the wings, approximately after Type of a narrow, curved drop, for the effectiveness of the rotor and the Wings for a high backwashing effect and for the education of a possible low flow resistance during the movement of the wing by the Fiber pulp is optimal.

Weiters ist aus der EP 0 887 459 A1 (VOITH SULZER PAPIERTECHNIK) ein Sortierer bekannt, der Räumflügel mit einem sich vom vordersten Ende zum hintersten Ende (in Drehrichtung gesehen) vergrößernden Abstand des Flügels zur Siebkorboberfläche aufweist. Eine ähnliche Ausgestaltung ist der US 5,232,552 zu entnehmen, wobei hier im Wesentlichen sich praktisch über die gesamte Höhe erstreckende Flügel vorgesehen sind, wobei aber auch andere Anordnungen, insbesondere in der Höhe in mehrere Abschnitte geteilte und gegebenefalls versetzt angeordnete Flügel, angeführt sind. Die Verwirbelung tritt somit nur periodisch auf.Furthermore, from EP 0 887 459 A1 (VOITH SULZER PAPIERTECHNIK) Grader known, the Räumflügel with a from the foremost end to rearmost end (seen in the direction of rotation) increasing the distance of the wing to Siebkorboberfläche has. A similar embodiment is the US 5,232,552, here essentially essentially over the Whole height extending wings are provided, but also other Arrangements, especially in height divided into several sections and Possibly arranged staggered wings are listed. The turbulence occurs thus only periodically.

Zum Stand der Technik ist ergänzend noch festzuhalten, dass zwei Grundtypen von Sortierern existieren, nämlich einerseits Sortierer mit einem von innen her mit Sortiergut-Suspension beschickbaren Siebkorb und innerhalb des Siebkorbes liegenden Flügeln, also "Zentrifugal-Sortierer", und anderseits Sortierer mit außerhalb des Siebkorbes rotierenden und denselben in geringem Abstand außen überstreichenden Flügeln, wobei bei diesen sogenannten "Zentripetal-Sortierern" das Sortiergut dem Siebkorb von außen zugeführt wird und die Abführung der gereinigten Faserstoff-Suspension von dessen Innerem erfolgt.To the state of the art, it should additionally be noted that two basic types of sorters exist, namely on the one hand sorter with a from inside with Sorting material suspension feedable screen basket and inside the screen basket lying wings, so "centrifugal sorter", and on the other hand sorter with rotating outside of the screen basket and the same at a small distance outside swept wings, with these so-called "centripetal sorters" the sorted material is supplied to the screen basket from the outside and the discharge of the purified pulp suspension is made from the inside.

Bei Zentripetal-Sortierern mit innenliegendem Siebkorb und außen umlaufenden Flügeln trägt der Drehschaft des Rotors im einlaufseitigen bzw. oberen Bereich des Siebkorbes einen nach außen hin den Siebkorb übergreifenden, etwa stern-oder scheibenförmigen Träger mit abwärts ragenden Fortsätzen, an welchem die um den Siebkorb rotierenden Flügel befestigt sind.For centripetal sorters with internal strainer basket and external rotating Wings carries the rotary shaft of the rotor in the inlet side or upper region the Siebkorbes an outwardly the screen basket cross, such as star or disc-shaped carrier with downwardly projecting extensions, on which the attached to the screen basket rotating wings.

Der vorliegenden Erfindung liegt nun die Beobachtung zugrunde, dass die bisher übliche Ausbildung der siebkorbnahen Fläche der Flügel in Form einer Tragflügelfläche, insbesondere die im voreilenden Bereich des Flügels vorgesehene Abstandsverringerung zwischen Flügel und Siebkorb, weder aus strömungstechnischer und energetischer Sicht noch bezüglich Effektivität des Trennvorganges, Durchsatzmengen und Trennleistung optimal ist.The present invention is based on the observation that the hitherto customary design of the screen basket-near surface of the wings in the form of a Wing area, especially in the leading area of the wing provided distance reduction between the sash and strainer, neither off From a fluidic and energetic point of view, the effectiveness of the Separation process, throughput and separation efficiency is optimal.

Unerwartet wurde gefunden, dass bei entsprechender Abänderung der Abstandsverhältnisse zwischen der dem Siebkorb zugekehrten Fläche der einzelnen Flügel und der dem jeweiligen Flügel zugekehrten Siebkorbfläche sowie auch durch spezielle Wahl der Querschnittsform der Flügel eine beachtliche Verbesserung der Betriebsergebnisse und der Qualität des gereinigten Gutes erreicht werden kann.Unexpectedly it was found that with appropriate modification of the Distance conditions between the screen basket facing surface of single wing and the respective wing facing Siebkorbfläche and also by special choice of the cross-sectional shape of the wings a considerable Improvement of the operating results and the quality of the cleaned goods can be achieved.

Gegenstand der Erfindung ist somit ein wie eingangs beschriebener Sortierer, der durch die im Kennzeichen des Anspruches 1 angeführten Merkmale charakterisiert ist.The invention thus provides a sorter as described above, the by the features cited in the characterizing part of claim 1 is characterized.

Durch die Anordnung der einzelnen Flügel bzw. durch die kontinuierliche Vergrößerung des Abstandes zwischen dem Siebkorb und der Fläche der Flügel wird jeglicher Druckstau vermieden. Es hat sich gezeigt, dass der auf die Sortiergut-Suspension für deren Durchlauf durch den Sortierer ausgeübte Druck durchaus ausreichend ist, um genügend große Mengen Faserstoff-Suspension durch die Öffnungen des Siebkorbes durchzudrücken und dass es keiner zusätzlichen Drucksteigerung durch einen dafür speziell mit sich verringerndem Abstand zur Siebkorbfläche gebildeten Anlaufbereich der Rotorflügel bedarf, um diesen Vorgang effektiv zu gestalten. Dadurch, dass der Anlaufbereich bzw. der voreilende Bereich des Flügels praktisch keinen oder nur einen kleinen Winkel mit der minimal beabstandeten Siebkorbfläche einschließt lassen sich innerhalb der Bereiche der vorgesehenen Winkel eine hohe Rückspülungsrate und ein wirksames Abheben von Partikelmaterial von der Siebkorbfläche infolge einer verstärkten Sogwirkung erreichen. Die geringeren Fliehkräfte aufgrund der - eine Tragflügelform vermeidenden -plattenartigen Querschnittsform der Flügel ermöglichen eine kostensparende Leichtbauweise, welche auch den Einsatz leichterer Flügelhalterungen ermöglicht.Due to the arrangement of the individual wings or by the continuous Increase of the distance between the sieve basket and the surface of the wings any pressure build-up is avoided. It has been shown that on the Sorting material suspension for the passage through the sorter pressure exerted is quite sufficient to sufficiently large quantities of pulp suspension squeeze through the openings of the screen basket and that there are none additional pressure increase by a specially with decreasing Distance from the sieve basket surface formed starting region of the rotor blades needs to to make this process effective. Due to the fact that the starting area or the leading edge of the wing practically no or only a small angle with the minimally spaced Siebkorbfläche can be within the Areas of intended angles have a high backwash rate and a Effective lifting of particulate material from the Siebkorbfläche due to a achieve increased suction effect. The lower centrifugal forces due to - one Wing shape avoiding plate-like cross-sectional shape of the wings allow a cost-saving lightweight construction, which also use lighter wing mounts allows.

Vielmehr wird durch die nunmehr vom gesamten Flügel aufgrund des nach rückwärts ansteigenden Abstandes zur Siebkorbfläche hin bewirkte erhöhte Sogwirkung ein wesentlich effektiveres Rückspülen und damit Abheben der vom Sortiergut abgetrennten Partikel bzw. Verunreinigungen von der Siebkorbwandung erreicht. Die erfindungsgemäß angeordneten und ausgebildeten Flügel üben über ihre gesamte Länge und Erstreckung in Drehrichtung, also vollflächig, in der Faserstoff-Suspension einen relativ zu deren sonstiger Druckbeaufschlagung im Gehäuse des Sortierers niedrigeren Druck bzw. "Unterdruck" aus. Damit wird die Rücksaugwirkung auf einen Teil der schon durch die Öffnungen des Siebkorbes hindurchgetretenen Fasergut-Suspension gesteigert, und es kommt zu einer Rückspülung durch die Öffnungen im Siebkorb. Durch das verbesserte Abheben der zurückgehaltenen Verunreinigungen verbessert sich das Trennverhalten und die Trennleistung der erfindungsgemäßen Sortierer.Rather, by the now from the entire wing due to the backward increasing distance to Siebkorbfläche out caused increased Suction effect a much more effective backwashing and thus lifting of the Sorted material separated particles or impurities from Siebkorbwandung reached. The inventively arranged and trained wings practice over their entire length and extension in the direction of rotation, ie the entire surface, in the Pulp suspension a relative to their other pressurization in the Enclosure of the sorter lower pressure or "negative pressure" off. This will be the Suction effect on a part of already through the openings of the screen basket increased due to the suspended fiber suspension, and it comes to a Backwash through the openings in the strainer basket. Due to the improved takeoff the retained impurities improve the separation behavior and the separation efficiency of the sorter according to the invention.

Wesentliche Vorteile der Sortierer bzw. der Flügel gemäß der Erfindung sind folgende:

  • Geringerer Energieverbrauch infolge geringeren Druckaufbaus im Anlaufbereich der Flügel und des somit geringeren Strömungswiderstandes.
  • Geringere Pulsationserzeugung durch Positionierung des engsten Strömungsquerschnittes zwischen Flügel und Siebkorbwandung unmittelbar an bzw. im Bereich der Flügelvorderkante.
  • Erzeugung hoher Turbulenzen an den Kanten der Flügel und dadurch verbesserte Siebfreilegung für hohe Durchsatz- und Trennleistungen.
  • Geringe Druckstöße in Richtung Siebfläche bzw. den dahinterliegenden Raum und dadurch deutlich verbesserte Sortiergüte.
  • Geringere Rotordrehzahl bei gleichbleibender Durchsatzleistung und somit geringerer Energiebedarf.
Substantial advantages of the sorters or the wings according to the invention are as follows:
  • Lower energy consumption due to lower pressure build-up in the starting area of the vanes and thus lower flow resistance.
  • Lower pulsation generation by positioning the narrowest flow cross-section between the sash and Siebkorbwandung directly on or in the area of the leading edge of the wing.
  • Generation of high turbulence at the edges of the wings and thus improved sieve exposure for high throughput and separation performance.
  • Low pressure surges in the direction of the screen surface or the space behind it and thus significantly improved sorting quality.
  • Lower rotor speed with constant throughput and thus lower energy consumption.

Für die gewünschte Rückspülung bzw. die Sogwirkung ist die Krümmung der dem Siebkorb zugewandten Fläche des Flügels von Bedeutung. So hat es sich gezeigt, dass ein verbesserter Rückspülgrad bei Ausbildung unterschiedlicher Krümmungen des in Drehrichtung vorderen und rückwärtigen Bereiches des einzelnen Flügels erzielbar ist, d.h. dann, wenn die Merkmale des Anspruches 3 verwirklicht sind.For the desired backwashing or the suction effect, the curvature of the screen basket facing surface of the wing is important. Thus, it has been shown that an improved degree of backwashing is achievable with the formation of different curvatures of the front and rear region of the individual wing in the direction of rotation, ie when the features of claim 3 have been realized.

Die Wahl von unterschiedlichen Krümmungen für die verschiedenen Bereiche der dem Siebkorb zugewandten Flügelfläche gemäß Anspruch 2 erlaubt eine gute Anpassung der Flügelfläche an unterschiedliche Betriebszustände und Materialzusammensetzungen. Von Vorteil sind in diesem Zusammenhang auch die Merkmale des Anspruches 12.The choice of different curvatures for the different areas of the screen basket facing wing surface according to claim 2 allows a good adaptation of the wing surface to different operating conditions and material compositions. Advantageous in this context, the features of claim 12.

Bei eingehenden Untersuchungen zur Optimierung der Querschniftsform der Rotorflügel wurde gefunden, dass die bisher übliche, kostspielige und auch in ihrer technischen Realisierung relativ aufwendige Gestaltung der Rotorflügel mit tragflügelartigem Querschnitt nicht nur nicht notwendig sondern sogar effektivitätsbehindernd sein kann. In - depth investigations to optimize the cross - sectional shape of the Rotor blades were found to be the usual, costly and also in their technical realization relatively complex design of the rotor blades with wing-like cross section not only not necessary but even can be effective.

Es hat sich im Sinne der Effektivität beim Trennen der Faserstoff-Suspension von den Verunreinigungspartikeln als vorteilhaft erwiesen, wenn die Merkmale des Anspruches 3 verwirklicht werden.It has proven to be advantageous in terms of effectiveness in separating the pulp suspension from the impurity particles when the features of claim 3 are realized.

Weiters hat sich gezeigt, dass bestimmte Ausführungsdetails die vorteilhaften Effekte der vorliegenden Erfindung noch zu steigern imstande sind. Dies gilt beispielsweise für die Gestaltung der in Drehrichtung vorderen Kante der Rotorflügel gemäß Anspruch 5.Furthermore, it has been found that certain design details are capable of further enhancing the beneficial effects of the present invention. This applies, for example, to the design of the front edge of the rotor blades in the direction of rotation according to claim 5.

Für die Gestalt bzw. Form der Flügelfläche haben sich verschiedene Konturformen als günstig erwiesen. Entsprechende Merkmale sind den Ansprüchen 6 und 7 zu entnehmen, die günstige Strömungsverhältnisse und Trennergebnisse erreichen lassen. Bei einer stufigen Ausbildung der Kontur müssen die Stufen bzw. Zacken durchaus nicht entlang einer Geraden angeordnet sein, sondern können einen konkav oder konvex gekrümmten Gesamtverlauf aufweisen. Im Sinne der Erfindung kann die sich von der Vorderseite nach hinten verbreiternde Kontur des Flügels in dessen rückwärtigem Drittel wieder im Winkel aufeinander zulaufende Ränder aufweisen. Die beschriebenen Konturformen der Flügel tragen auch zur Verringerung des Strömungswiderstandes bei ihrer Bewegung durch die Faser-Suspension bei.For the shape or shape of the wing surface, various contour shapes have proven to be favorable. Corresponding features are given in claims 6 and 7, which can achieve favorable flow conditions and separation results. In the case of a stepped configuration of the contour, the steps or points need not be arranged along a straight line, but may have a concave or convex overall course. For the purposes of the invention, the contour of the wing, widening from the front side to the rear, may again have angles running towards each other in its rear third. The described contour shapes of the wings also contribute to the reduction of the flow resistance as it moves through the fiber suspension.

Es wurde weiters gefunden, dass die Sogwirkung noch gesteigert werden kann, wenn - wie gemäß Anspruch 6 vorgesehen - dafür gesorgt wird, dass die Flügelflächen sich quer zur Rotordrehrichtung erstreckende, etwa leistenartige Erhebungen aufweisen, hinter welchen jeweils eine im Vergleich zur üblichen Sogwirkung der Flügelfläche lokal verstärkte Sogwirkung auftritt. Die Art der Anordnung der einzelnen Flügel auf dem Rotor kann in weiten Grenzen variieren, jedoch sind in mehreren Reihen übereinander und höhen-und/oder umfangsmäßig versetzt angeordnete Flügel besonders bevorzugt.It has also been found that the suction effect can still be increased if - as provided for in accordance with claim 6 - it is ensured that the Wing surfaces extending transversely to the direction of rotor rotation, such as strip-like Have surveys, behind each one compared to the usual Suction effect of the wing surface locally enhanced suction effect occurs. The nature of the arrangement of the individual wings on the rotor can be far in Borders vary, however, are in several rows one above the other and heights and / or circumferentially offset arranged wings particularly preferred.

Als wirkungsvoll haben sich in der Praxis Rotoren mit Flügeln gemäß Anspruch 9 erwiesen.Rotors with wings according to claim 9 have proven to be effective in practice.

Der Rotor selbst kann einstückig ausgebildet sein. Zweckmäßig kann eine Ausführungsform sein, bei der mehrere Rotoreinzelmodule zu einem Rotor beliebiger Axialerstreckung zusammengesetzt sind, wie im Anspruch 10 angegeben ist. The rotor itself may be formed in one piece. It may be expedient to use an embodiment in which a plurality of individual rotor modules are assembled to form a rotor of any desired axial extent, as specified in claim 10.

Was die Befestigung der Flügel am Rotor bzw. an den von seinem Schaft getragenen Trägern bzw. Stegen betrifft, so wird auf Anspruch 11 verwiesen, dessen Merkmale hohe Robustheit im Betrieb und mechanische Stabilität erreichen lassen.As regards the attachment of the wings to the rotor or to the supports or webs carried by its shaft, reference is made to claim 11, whose characteristics allow high robustness in operation and mechanical stability to be achieved.

Die Erfindung betrifft des weiteren einen Flügel gemäß dem Oberbegriff des Anspruches 13. Bei den herkömmlichen Flügeln ist es als nachteilig anzusehen, dass diese massiv und schwer aufgebaut sind, insbesondere weil diese Flügel im Querschnitt tragflächenförmig aufgebaut sind. Um diese Nachteile zu vermeiden, sind die erwähnten Flügel erfindungsgemäß durch die im Kennzeichen des Anspruches 13 angeführten Merkmale charakterisiert. Bei einem derartigen Aufbau der Flügel wird es möglich, die Flügel in Leichtbauweise herzustellen und in einfacher Weise den Flügeln die gewünschte Form zu verleihen, und diese an unterschiedliche Einsatzzwecke anzupassen.The invention further relates to a wing according to the preamble of claim 13. In the conventional wings, it is to be considered disadvantageous that they are solid and heavy, in particular because these wings are constructed wing-shaped in cross-section. To avoid these disadvantages, the said wings are inventively characterized by the features cited in the characterizing part of claim 13. With such a structure of the wings, it becomes possible to manufacture the wings in lightweight construction and to easily give the wings the desired shape, and to adapt these to different purposes.

Besonders vorteilhaft ist es, wenn die Merkmale der Ansprüche 19 und/oder 20 erfüllt sind, da damit ein einfaches Austauschen der Flügel bei einem Sortierer erreicht werden kann, insbesondere um Flügel einsetzen zu können, die an verschiedene Drehzahlen des Rotors bzw. unterschiedliche Stoffsuspensionen angepaßt sind.It is particularly advantageous if the features of claims 19 and / or 20 are met, as this allows a simple replacement of the wings can be achieved in a sorter, in particular to use wings, adapted to different speeds of the rotor or different pulp suspensions are.

Anhand der Zeichnung wird die Erfindung näher erläutert:Reference to the drawing, the invention is explained in more detail:

Die Fig. 1, 2 und 3 zeigen jeweils schematische Schnittansichten von Sortierern gemäß dem Stand der Technik. Fig. 4 zeigt die Schnittansicht eines ebenfalls dem Stand der Technik entsprechend ausgebildeten Rotorflügels. Fig. 5 zeigt schematisch eine Schnittansicht eines Flügels eines innerhalb des Siebkorbes angeordneten Rotors eines Sortierers gemäß der Erfindung. Fig. 6 zeigt schematisch eine Schnittansicht eines außen um einen innenliegenden Siebkorb rotierend geführten Flügels. Fig. 7, 8 und 9 zeigen schematisch verschiedene Anordnungen von Flügeln. Die Fig. 10 bis 16 zeigen jeweils Draufsichten auf erfindungsgemäße Flügel mit verschiedengestaltigen Konturen. Fig.17,18 und 19 zeigen Befestigungsmöglichkeiten von Flügeln an Rotoren.FIGS. 1, 2 and 3 show schematic sectional views of sorters, respectively according to the prior art. Fig. 4 shows the sectional view of a likewise the State of the art according trained rotor blade. Fig. 5 shows schematically a sectional view of a wing one within the screen basket arranged rotor of a sorter according to the invention. Fig. 6 shows schematically a sectional view of an outside around an inner screen basket rotating wing. Figs. 7, 8 and 9 show schematically different Arrangements of wings. FIGS. 10 to 16 each show plan views inventive wings with different shape contours. Fig.17, 18 and 19 show attachment possibilities of wings to rotors.

Der in Fig. 1 und 2 in einer horizontalen und einer vertikalen Schnittansicht schematisch dargestellte Sortierer 100 weist ein Gehäuse 5 mit einem Zulauf 51 für eine Sortiergut-Suspension mit einem Ablauf 52 für von Fremdpartikeln befreiten Gutstoff auf. An der Basis des Gehäuses 5 ist ein Auslaß 53 od. dgl. für die Abführung der aus dem Sortiergut abgetrennten Verunreinigungen angeordnet. In dem Innenraum 500 des etwa faßartig oder zylindrisch geformten Gehäuses 5 ist ein zylinderförmig ausgebildeter Siebkorb 2 mit loch- oder schlitzartigen Durchtrittsöffnungen 204 für die gereinigte Faserstoff-Suspension konzentrisch angeordnet. Im Innenraum 200 des Siebkorbes 2 ist ein im wesentlichen rotationsparaboloidförmiger oder kegelförmiger oder zylindrischer Rotor 300 auf einem von einem Motor 6 angetriebenem Schaft 381 um eine senkrechte Drehachse a3 drehbar gelagert. Vom Rotor 300 gehen Stege 382 insbesondere radial ab, welche jeweils an ihrem siebkorbnahen Ende einen an der Innenfläche 20 des Siebkorbes 2 vorbeiführbaren Flügel 3 tragen. Das durch den Zulauf 51 unter Druck zugeführte Sortiergut gelangt hier in den durch die paraboloide Gestalt des Rotors 300 nach unten hin in seinem Querschnitt konzentrisch immer mehr eingeengten Innenraum 200 des Siebkorbes 2. Der Gutstoff, umfassend das feinfaserige verunreinigungsfreie Material, wird unter Wirkung des in die Faser-Suspension eingebrachten Drucks durch die Öffnungen 204 des Siebkorbes 2 nach außen in den den Siebkorb 2 umgebenden Innenraum 500 des Gehäuses 5 gedrückt, aus dem die Suspension über den Ablauf 52 abgeführt wird. Die Öffnungen 204 des Siebkorbes 2 sind so dimensioniert, dass die in der SortiergutSuspension enthaltenen Fremdmaterial-Partikel, wie z.B. Glassplitter, gröbere Sandteilchen, kleine Steinchen, Metallteilchen od. dgl., im Siebkorb 2 verbleiben, insbesondere an dessen Innenfläche 20 im Bereich der Durchtrittsöffnungen 204 anliegen. Ohne entsprechende Gegenmaßnahmen würde es dazu kommen, dass sich die Öffnungen 204 zusetzen und der Durchtritt der fremdpartikelfreien, feinfaserigen GutstoffSuspension unterbunden wäre. Um dies zu verhindern, besitzen die bekannten Flügel 3 etwa flugzeugtragflügelartigen Querschnitt und ihr in Drehrichtung dr nachlaufender Bereich 33 ihrer Außenfläche 30 übt infolge seines zunehmenden Abstandes von der Innenfläche 20 des Siebkorbes 2 einen Sog auf die Suspension aus. Damit wird eine Rückspülung eines kleinen Anteils der unmittelbar zuvor durch den Siebkorb 2 filtrierten bzw. außen gedrückten Gutstoff-Suspension in den Siebkorb 2 zurück erreicht. Durch diese Rückspülung werden die die Öffnungen 204 verlegenden Fremdpartikel von der Innenfläche 20 des Siebkorbes 2 abgelöst, sinken zum Grund des Siebkorbes 2 ab und gelangen schließlich zum Auslaß 53.The sorter 100, shown schematically in FIGS. 1 and 2 in a horizontal and a vertical sectional view, has a housing 5 with a feed 51 for a sorting material suspension with a discharge 52 for accepts which have been cleared of foreign particles. At the base of the housing 5 is an outlet 53 od. Like. For the removal of the separated from the sorted contaminants arranged. In the inner space 500 of the approximately barrel-like or cylindrically shaped housing 5, a cylindrically shaped screen basket 2 with holes or slot-like passage openings 204 for the purified pulp suspension is arranged concentrically. In the interior 200 of the strainer basket 2, a rotor 31 which is substantially rotationally paraboloidal or conical or cylindrical is rotatably mounted on a shaft 381 driven by a motor 6 about a vertical axis of rotation a3. From the rotor 300 go webs 382 in particular radially, each carrying at its Siebkorbnahen end one on the inner surface 20 of the screen basket 2 vorbeiführbaren wings 3. The sorted material supplied under pressure through the inlet 51 passes here into the interior 200 of the screen basket 2 which concentrically narrows more and more in its cross-section through the paraboloidal shape of the rotor 300. The accept material, comprising the fine-fibrous contamination-free material, is produced under the action of the the fiber suspension introduced pressure through the openings 204 of the screen basket 2 to the outside in the screen basket 2 surrounding the interior 500 of the housing 5 is pressed, from which the suspension is discharged via the outlet 52. The openings 204 of the screen basket 2 are dimensioned such that the foreign material particles contained in the sorting material suspension, such as glass splinters, coarser sand particles, small stones, metal particles or the like, remain in the screen basket 2, in particular on its inner surface 20 in the region of the passage openings 204 lie. Without appropriate countermeasures, it would happen that the openings 204 become clogged and the passage of the foreign particle-free, fine-fiber accepts suspension would be prevented. To prevent this, have the known wing 3 about aircraft wing-like cross-section and their dr in the direction of rotation tra trailing portion 33 of its outer surface 30 exerts due to its increasing distance from the inner surface 20 of the screen basket 2 a suction on the suspension. This achieves a backwashing of a small portion of the accepts suspension filtered directly through the sieve basket 2 or pressed outwards into the sieve basket 2. As a result of this backwashing, the foreign particles depositing the openings 204 are detached from the inner surface 20 of the screen basket 2, sink to the bottom of the screen basket 2 and finally reach the outlet 53.

Der in der Fig. 3 gezeigte Sortierer 100 arbeitet nach einem zum Arbeitsprinzip des in den Fig. 1 und 2 gezeigten Sortierers 100 inversen Prinzip. Das Gehäuse 5 weist einen unten liegenden Einlauf 51 für zu sortierende Faser-Suspension, einen oben liegenden Ablauf 52 für die von Verunreinigungen befreite Faserstoff-Suspension sowie einen ebenfalls relativ hoch liegenden Auslaß 53 für Verunreinigungen auf. Im Gehäuse 5 ist ein mit einem Motor 6 um die Achse a3 rotierbarer Rotor 300 mit kegelförmigem Querschnitt angeordnet. Am oberen Ende des Rotors 300 ist eine Tragscheibe oder es sind sternförmig radial abgehende Arme bzw. Stege 382 gelagert. Von der Tragscheibe bzw. den Armen 382 gehen nach unten Flügelträger 380 ab, welche die nach innen ragenden Flügel 3' tragen. Die Innenflächen 30' der Flügel 3' rotieren um den Siebkorb 2 bzw. um dessen Außenfläche 20' mit relativ knappem Abstand. Die Trennung von Gutstoff und Verunreinigungen erfolgt analog wie im Zusammenhang mit den Fig.1 und 2 beschrieben. Auch bei dem in der Fig. 3 dargestellten, bekannten Aufbau besitzenden Sortierer 100 sind die Flügel 3' im wesentlichen etwa tragflügelförmig gestaltet und zeigen die oben erörterten Nachteile von erhöhtem Energieaufwand und nicht optimaler Rückspülwirkung und damit weniger effektiver Reinigung des Siebkorbes 2 bzw. Freilegung der Öffnungen 204.The sorter 100 shown in FIG. 3 operates according to the working principle of the sorter 100 shown in Figs. 1 and 2 inverse principle. The housing 5 has a lower inlet 51 for fiber suspension to be sorted, an overhead drain 52 for the de-contaminated Pulp suspension and also a relatively high outlet 53 for Impurities on. In the housing 5 is a with a motor 6 about the axis a3 rotatable rotor 300 arranged with a conical cross section. At the top End of the rotor 300 is a support disk or it is radially star-shaped outgoing arms or webs 382 stored. From the support disk or the arms 382 go down wing carrier 380, which projecting inward Wings 3 'wear. The inner surfaces 30 'of the wings 3' rotate around the strainer basket 2 or around its outer surface 20 'at a relatively close distance. The separation of Acceptance and impurities are analogous as in connection with the Figures 1 and 2 described. Also in the illustrated in Fig. 3, known Construction sorter 100, the wings 3 'are substantially about wing-shaped and show the above-discussed disadvantages of increased Energy consumption and not optimal backwashing and thus less effective cleaning of the screen basket 2 or exposure of the openings 204.

Die schematische Zeichnung gemäß Fig. 4 zeigt einen Teil des Siebkorbes 2 mit seinen Durchtrittsöffnungen 204 für die Gutstoff-Suspension. Der radiale Abstand ar der siebkorbnahen Fläche 30 des Flügels 3 von der Innenfläche 20 des Siebkorbes 2 verändert sich über die Länge des Flügels 3. Der im Querschnitt tragflügelartige Flügel 3 weist an seiner Vorderkante 310 und/oder im vordersten Anlaufbereich 31 einen relativ großen radialen Abstand arv auf. Zwischen diesem Anlaufbereich 31 des Flügels 3 und einer relativ schmalen mittleren Zone 32 nimmt der radiale Abstand ar auf einen minimalen Abstand arm ab. Von der Zone 32 steigt der radiale Abstand ar zum rückseitigen Bereich 33 bzw. zur Endkante 330 hin auf einen maximalen Wert arh an. Im Bereich der Vorderkante 310 über dem vorderen Bereich 31 entsteht ein bis zur Zone 32 reichender Druckstau, wenn der Flügel 3 in Drehrichtung dr bewegt wird. Nur im Nachlaufbereich 33, in dem der Abstand zwischen der Fläche 30 und der Fläche 20 des Siebkorbes 2 zunimmt, wird die für die Rückspülung der Verunreinigungen wichtige Sogwirkung erstellt. Der Flügel 3 ist innenseitig mit einer ebenen Fläche 3001 ausgebildet.The schematic drawing of FIG. 4 shows a part of the screen basket 2 with its passage openings 204 for the accepts suspension. The radial distance ar of the basket-like surface 30 of the blade 3 from the inner surface 20 of the screen basket 2 changes over the length of the wing 3. The wing-wing-like in cross-section 3 has at its front edge 310 and / or in the foremost approach area 31 has a relatively large radial distance arv up. Between this starting region 31 of the blade 3 and a relatively narrow central zone 32, the radial distance ar decreases to a minimum distance arm. From the zone 32, the radial distance ar increases toward the rear region 33 or towards the end edge 330 to a maximum value arh. In the area of the front edge 310 above the front area 31, a pressure accumulation reaching up to the zone 32 is created when the wing 3 is moved in the direction of rotation dr. Only in the wake region 33, in which the distance between the surface 30 and the surface 20 of the screen basket 2 increases, the important for the backwashing of the impurities suction effect is created. The wing 3 is formed on the inside with a flat surface 3001.

Eingehende Untersuchungen haben gezeigt, dass die Tragflügelgestalt der Flügel 3 in Hinblick auf die für die Rotation des Rotors 300 benötigte Energie, die Effektivität der Rückspülung und die Freihaltung der Durchtrittsöffnungen 204 von Fremdpartikeln nicht optimal ist. Dadurch dass der tragflügelartigen Querschnitt aufweisende Flügel 3 gemäß dem Stand der Technik in Drehrichtung dr einen seinen Abstand ar etwa bis in den Bereich der Höhe des Steges 382 (Fig. 1) hin verringernden Anlaufbereich 31 aufweist, kommt es zu einer die Rotation hindernden Staudruckgegenwirkung in der Faserstoff-Suspension, welche den Energieaufwand für die Rotation erhöht. Weiters steht für die für die Rückspülung zur Reinigung der Siebkorböffnungen 204 benötigte Sogwirkung nur ein Teil der gesamten Flügelfläche 30, nämlich der nachlaufende Bereich 33, zur Verfügung. In - depth investigations have shown that the wing shape of the Wing 3 in view of the energy required for the rotation of the rotor 300, the Effectiveness of backwashing and the free passage of the openings 204 of Foreign particles is not optimal. Due to the fact that the wing-like cross-section having blades 3 according to the prior art in the direction of rotation dr a its distance ar approximately up to the area of the height of the web 382 (FIG. 1) decreasing start-up area 31, it comes to a rotation hindering back pressure counteracting effect in the pulp suspension, which the Increased energy expenditure for the rotation. Furthermore, stands for the backwashing required to clean the Siebkorböffnungen 204 suction effect only a part of entire wing surface 30, namely the trailing portion 33 available.

Der in der Fig. 5 in Schnittansicht gezeigte, erfindungsgemäß angeordnete und ausgebildete Flügel 3 weist eine der zylindermantelförmigen Fläche 20 des Siebkorbes 2 zugewandte, konvex gekrümmte Außenfläche 30 auf. Der Flügel 3 ist plattenförmig, z.B. aus einem Blech oder aus Kunststoffmaterial mit gleichbleibender Dicke bzw. Materialstärke ms, gebildet. Vorteilhafterweise verläuft die Innenfläche 3001 parallel zur Außenfläche 30 bzw. besitzen diese beiden Flächen 30 und 3001 gleiche Krümmung.The illustrated in FIG. 5 in sectional view, according to the invention arranged and trained wing 3 has a cylinder jacket-shaped surface 20 of the screen basket 2 facing, convexly curved outer surface 30. The wing 3 is plate-shaped, for example, from a sheet or plastic material with a constant thickness or material thickness ms formed. Advantageously, the inner surface 3001 is parallel to the outer surface 30 or have these two surfaces 30 and 3001 same curvature.

Die Dicke des Flügels 3 beträgt in der Praxis etwa 5 bis 6 mm, der Durchmesser des Siebkorbes 2 beträgt üblicherweise 400 bis 3000 mm, seine Höhe etwa 500 bis 1500 mm.The thickness of the blade 3 is in practice about 5 to 6 mm, the diameter of the screen basket 2 is usually 400 to 3000 mm, its height about 500 up to 1500 mm.

Den kleinen Nebenskizzen zur Fig. 5 sind drei Beispiele für eine bevorzugte Gestaltung der Vorderkante 310 des Flügels 3 entnehmbar, wobei die Stirnfläche gemäß a) rechteckförmigen Querschnitt, gemäß b) eine gleichartige Querschnittsform mit abgerundeten Kanten 3101 und gemäß Skizze c) eine Abrundung 3102 zeigt.The small side sketches of FIG. 5 are three examples of a preferred one Design of the leading edge 310 of the wing 3 removable, the end face according to a) rectangular cross section, according to b) a similar Cross-sectional shape with rounded edges 3101 and sketch c) a Rounding off 3102 shows.

Der sich von den Flügeln gemäß dem Stand der Technik wesentlich unterscheidende erfindungsgemäße Flügel 3 ist relativ zum Verlauf der zugewandten Fläche 20 des Siebkorbes 2 so positioniert, dass sich die Fläche 30 des Flügels 3 von seiner Vorderkante 310 zur Endkante 330 hin immer weiter von der Fläche 20 entfernt bzw. der radiale Abstand ar von vorne nach hinten zunimmt. Der kleinste Radialabstand arv liegt bei der Vorderkante 310, der maximale Abstand arh bei der rückseitigen Endkante 330.The wing 3 according to the invention, which differs substantially from the wings according to the prior art, is positioned relative to the course of the facing surface 20 of the screen basket 2 such that the surface 30 of the wing 3 moves further and further away from its front edge 310 towards the end edge 330 20 removed or the radial distance ar increases from front to back. The smallest radial distance arv is at the leading edge 310, the maximum distance arh at the rear end edge 330.

Gemäß Fig. 5 ist der Krümmungsradius rsk der Fläche 20 des Siebkorbes 2 größer als jeder der beiden Krümmungsradien rf1 und rf2 des voreilenden Bereiches 31 und des nacheilenden Bereiches 33 der Fläche 30 des Flügels 3. Die Fläche 30 weist vorteilhafterweise im Bereich der vorderen Endkante 310 einen nahezu parallelen Verlauf zur Fläche 20 auf. Eine unmittelbar im Bereich der Vorderkante 310 an den vorderen Bereich 31 angelegte Tangentialebene etf schließt mit der radial entsprechenden an die Fläche 20 angelegten Tangentialebene ets einen spitzen Winkel α von wenigen Graden ein, der vom Radius rf1 der Krümmung im Bereich der Vorderkante 310 bestimmt wird.5, the radius of curvature rsk of the surface 20 of the screen basket 2 is greater than each of the two radii of curvature rf1 and rf2 of the leading portion 31 and the trailing portion 33 of the surface 30 of the blade 3. The surface 30 advantageously has in the region of the front end edge 310th a nearly parallel course to the surface 20. A tangential plane etf applied directly to the front region 31 in the region of the front edge 310 includes, with the radially corresponding tangential plane ets applied to the surface 20, an acute angle α of a few degrees, which is determined by the radius rf1 of the curvature in the region of the front edge 310.

Der radiale Abstand ar der Fläche 30 steigt vom Minimalabstand arv kontinuierlich zu einem Maximalabstand arh an und durch diese "Schrägstellung" des Flügels 3 in Bezug auf die Drehrichtung dr bzw. gegenüber dem Siebkorb 2 ist die für das Rückspülen wirksame Sogwirkung bei der Bewegung des Flügels 3 relativ zum Siebkorb 2 über die gesamte Flügelerstreckung in Drehrichtung dr sichergestellt.The radial distance ar of the surface 30 increases from the minimum distance arv continuously to a maximum distance arh and by this "inclination" of the blade 3 with respect to the direction of rotation dr or with respect to the screen basket 2 is effective for the backwashing suction during the movement of the wing 3 relative to the screen basket 2 over the entire wing extension in the direction of rotation dr ensured.

Gemäß einer speziellen Ausführungsform kann vorgesehen sein, dass der Radius rf1 der Krümmung des vorderen Bereiches 31 der Fläche 30 kleiner ist als der Radius rf2 der Krümmung im nacheilenden Bereich 33, wobei in der Zwischenzone 32 zwischen den beiden unterschiedlichen Krümmungen ein Übergangsbereich vorgesehen ist. Eine etwa dem Verlauf einer Erzeugenden der Fläche 30 folgende Kante zwischen dem stärker gekrümmten Anlaufbereich 31 und dem weniger stark gekrümmten Auslaufbereich 33 der Fläche 30 ist nicht wünschenswert.According to a specific embodiment, it may be provided that the radius rf1 of the curvature of the front region 31 of the surface 30 is smaller than the radius rf2 of the curvature in the trailing region 33, wherein a transition region is provided in the intermediate zone 32 between the two different curvatures. An edge which follows the course of a generatrix of the surface 30 between the more curved start-up region 31 and the less curved discharge region 33 of the surface 30 is not desirable.

Die beschriebene Änderung des Grades der Krümmung über den Verlauf des Flügels 3 hin bringt vorteilhafte Änderungen in den Strömungsverhältnissen und führt in der Suspension zu günstigen Druckänderungen. Die Krümmungen sind bevorzugt kreiszylindrisch, können aber auch oval oder elliptisch ausgeführt sein.The described change in the degree of curvature over the course of the Wing 3 brings beneficial changes in the flow conditions and leads in the suspension to favorable pressure changes. The bends are preferably circular cylindrical, but can also be designed oval or elliptical.

Von besonderem Vorteil ist es, wenn die an den voreilenden Endbereich 31 der siebkorbnahen Fläche 30,30' bzw. an den Nahbereich der Spitze oderIt is particularly advantageous if the leading end region 31 of the Siebkorbnahen surface 30,30 'or to the vicinity of the tip or

Vorderkante 310 des Flügels 3,3' angelegte Tangentialebene etf einen Winkel α von 0 bis 15°, vorzugsweise von 0 bis 8°, insbesondere von 0 bis 2°, mit der an eine radial entsprechende Erzeugende ezs der dem Flügel 3,3' zugewandten Fläche 20,20' des Siebkorbes 2 angelegten Tangentialebene ets einschließt. Damit werden ein strömungsgünstiger Verlauf der Fläche 30 und eine gute Sogwirkung erreicht. Diese Dimensionierung gilt für innerhalb und/oder außerhalb des Siebkorbes 2 umlaufende Flügel 3,3'. Front edge 310 of the wing 3,3 'applied tangential plane etf an angle α from 0 to 15 °, preferably from 0 to 8 °, in particular from 0 to 2 °, with the ezs to a radially corresponding generatrix of the wing 3,3' facing Surface 20,20 'of the screen basket 2 applied tangential plane ets includes. Thus, a flow-favorable course of the surface 30 and a good suction effect can be achieved. This dimensioning applies to inside and / or outside the screen basket 2 encircling wings 3,3 '.

Zweckmäßig kann es sein, wenn die Krümmung der siebkorbnahen Fläche 30 des Flügels 3 in ihrem vorderen bzw. voreilenden Bereich 31 um 5 bis 20%, vorzugsweise um 10 bis 15%, größer ist als die Krümmung der zugewandten Fläche 20 des Siebkorbes 2 und wenn die Krümmung der siebkorbnahen Fläche 30 des Flügels 3 in ihrem nach-eilenden Bereich 33 um 0 bis 9%, vorzugsweise um 0 bis 4%, größer ist als die Krümmung der Fläche 30 des Siebkorbes 2.It may be useful if the curvature of the screen-like area 30 of the Wing 3 in its front or leading area 31 by 5 to 20%, preferably by 10 to 15%, greater than the curvature of the facing Surface 20 of the screen basket 2 and when the curvature of the screen basket near the surface 30 of the wing 3 in their post-hurry area 33 by 0 to 9%, preferably by 0 to 4%, greater than the curvature of the surface 30 of the screen basket. 2

Fig. 6 zeigt schematisch den Siebkorb 2 eines Zentripetal-Sortierers mit außen um den Siebkorb 2 rotierenden Flügeln 3' mit Flächen 30', welche eine geringere Krümmung als die Außenfläche 20' des Siebkorbes 2 aufweisen und mit ihrer konvexen Fläche 30' der Außenfläche 20' des Siebkorbes 2 zugewandt sind. Mit strichlierten Linien ist noch angedeutet, dass die Krümmung des Flügels 3' im vorderen Bereich 31' unter Umständen auch "Unendlich" groß sein kann, d.h., dass der Winkel α an der Endkante 310 den Grenzwert 0° annehmen könnte.Fig. 6 shows schematically the screen basket 2 of a centripetal sorter with outside order the screen basket 2 rotating wings 3 'with surfaces 30', which has a smaller Have curvature as the outer surface 20 'of the screen basket 2 and with their convex surface 30 'of the outer surface 20' of the screen basket 2 are facing. With dashed lines is still hinted that the curvature of the wing 3 'in the may also be "infinite" in size, i.e. the angle α at the end edge 310 could assume the limit 0 °.

Die Fig. 7 zeigt einen Rotor 300 mit höhenmäßig gegeneinander versetzten, zig-zag-förmig angeordneten, erfindungsgemäß ausgebildeten Flügeln 3. In Fig. 8 ist ein Rotor 300 mit umfangsmäßig gegeneinander versetzt angeordneten Flügeln 3 dargestellt. Fig. 9 zeigt einen erfindungsgemäß ausgestatteten Rotor 300 mit längs einer ansteigenden Spirallinie angeordneten Flügeln 3.7 shows a rotor 300 with height offset from each other, arranged zig-zag-shaped, inventively designed wings 3. In Fig. 8 is a rotor 300 arranged circumferentially offset from each other Wings 3 shown. Fig. 9 shows a rotor equipped according to the invention 300 with wings arranged along a rising spiral line 3.

Die Fig.10 bis 16 zeigen erfindungsgemäß ausgebildete Flügel 3,3' mit der Reihe nach trapezförmiger, dreieckiger und prinzipiell trapezförmiger Gesamtkontur. Der Flügel 3 gemäß Fig. 12 besitzt auf seiner Fläche 30 angeordnete, im Winkel γ zur Richtung der Flügelerzeugenden ezf verlaufende, in diesem Fall etwa parallel zum unteren Seiten-rand 35 angeordnete, leistenartige Verwirbelungserhebungen 308. Anstelle der Erhebungen 308 können auch nutenförmige Vertiefungen im Flügel 3 ausgebildet werden.FIGS. 10 to 16 show wings 3,3 'designed according to the invention with the row according to trapezoidal, triangular and principally trapezoidal overall contour. Of the Wing 3 shown in FIG. 12 has arranged on its surface 30, at an angle γ to Direction of the wing-producing ezf running, in this case approximately parallel to lower side edge 35 arranged, strip-like Verwirbelungserhebungen 308th Instead of the elevations 308 can also groove-shaped depressions in the wing. 3 be formed.

Der von den gegen die Drehrichtung dr auseinanderstrebenden Seitenrändern 35 eingeschlossene Winkel ω beträgt 20 bis 60°, bevorzugt 25 bis 50°. Die etwa leistenartigen Erhebungen 308 bzw. die Vertiefungen auf der Fläche 30 eines Flügels 3 lösen bei Bewegung des Flügels 3 lokale Unterdruckwirbel aus, welche die Ablösung von festhaftenden Fremdstoffpartikeln vom Siebkorb 2 unterstützen.The apart from the direction of rotation dr diverging side edges 35 included angle ω is 20 to 60 °, preferably 25 to 50 °. The approximately strip-like elevations 308 and the depressions on the surface 30 of a Wing 3 trigger 3 local vacuum vortices when moving the wing, which support the detachment of adherent foreign particles from the screen basket 2.

Beim Flügel 3 gemäß Fig. 13 sind die Seitenkanten 35 konvex abgewinkelt ausgebildet, wobei die an die vordere, kurze Querkante 310 direkt anschließenden Abschnitte 351 den Winkel ω miteinander einschließen. Die Seitenränder 35 des Flügels 3 der Fig. 14 sind in Form gleichmäßiger Stufen 352 ausgeführt. Die stufenartige Ausbildung der Seitenränder 35 bringt eine wesentliche Steigerung ihrer Gesamtlänge und fördert so die Turbulenz der Faserstoff-Suspension bei der Rotation der Flügel 3.When wing 3 of FIG. 13, the side edges 35 are angled convexly formed, with the front, short transverse edge 310 directly subsequent sections 351 enclose the angle ω with each other. The Side edges 35 of the wing 3 of FIG. 14 are in the form of uniform steps 352 executed. The step-like formation of the side edges 35 brings a substantial increase in their total length and thus promotes the turbulence of Pulp suspension during the rotation of the blades 3.

Die Konturform des Flügels 3 der Fig. 15 weist im vorderen Bereich divergierende Seitenränder 35 auf, welche etwa im rückseitigen Drittel der Fläche 30 sich nach innen hin abzubiegen beginnen und in zwei kurzen Ästen nach rückwärts im Winkel aufeinander zu verlaufen und mit der Endkante 330 enden. Der Flügel 3 gemäß der Fig. 16 weist schwalbenschwanzförmige Kontur mit einer kurzen Vorderkante 310 auf.The contour shape of the wing 3 of FIG. 15 has diverging in the front region Side edges 35, which approximately in the back third of the surface 30 after Begin to turn inside and back in two short branches Angle to each other and end with the end edge 330. The wing 3 16 has dovetail-shaped contour with a short Leading edge 310 on.

In Fig. 17, 18 und 19 sind schematisch Flügel 3, 3' dargestellt, die auf unterschiedliche Art und Weise mit den vom Rotor 300 abgehenden Armen bzw. Stegen 382 bzw. Trägern 384 verbunden werden können. Die Flügel 3,3' bestehen aus gebogenem Blech, insbesondere mit einer zueinander parallel verlaufenden Außenfläche 30 und Innenfläche 3001. Gemäß Fig. 17 und 18 ist an den Flügel 3,3' ein Fußteil 383 angeformt. Der Fußteil 383 gemäß Fig. 17 besitzt eine innenliegende hülsen-förmige Ausnehmung 385, in die ein Fortsatz 386 des Trägers 382 eingeführt ist. Seitliche Vorsprünge 387 nehmen die seitlichen Begrenzungen 388 der Ausnehmung 385 auf. Die Verbindung zwischen dem Vorsprung 386 und der Ausnehmung 385 erfolgt - wie angedeutet - mit einer Schraube.In Fig. 17, 18 and 19 schematically wings 3, 3 'are shown, the on different manner with the outgoing from the rotor 300 arms or Webs 382 and straps 384 can be connected. The wings 3,3 ' consist of bent sheet metal, in particular with a parallel to each other extending outer surface 30 and inner surface 3001. According to Fig. 17 and 18 is at the wing 3,3 'a foot part 383 formed. The foot part 383 according to FIG. 17 has an inner sleeve-shaped recess 385, into which an extension 386 of the Carrier 382 is introduced. Side tabs 387 take the lateral ones Limitations 388 of the recess 385. The connection between the Projection 386 and the recess 385 takes place - as indicated - with a Screw.

Bei der Ausführungsform des Flügels 3, 3' gemäß Fig. 18 ist der Endbereich des Fußteils 383 mit einem Vorsprung 389 versehen, der mit einem Vorsprung 390 des Steges 382 zusammenwirkt. Die Vorsprünge 389 und 390 werden - wie bei 384 angedeutet - miteinander verschraubt.In the embodiment of the wing 3, 3 'according to FIG. 18, the end region of the Foot portion 383 provided with a projection 389 having a projection 390th of the web 382 cooperates. The projections 389 and 390 are - as in 384 indicated - screwed together.

Gemäß Fig. 19 kann der Flügel 3,3' mittels bei 384 angedeuteten Schrauben mit einem an dem Träger bzw. Steg 382 befestigten Tragteil 391 verschraubt werden.19, the wing 3,3 'by means of indicated at 384 screws with a fixed to the support or web 382 support member 391 are screwed.

Die dargestellten Ausführungsformen lassen einen einfachen Austausch der Flügel 3,3' zu, so dass ein mit derartigen Flügeln versehener Sortierer rasch an unterschiedliche Betriebszustände angepaßt werden kann.The illustrated embodiments allow a simple exchange of Wing 3,3 'to, so that provided with such wings sorter to quickly different operating conditions can be adjusted.

Claims (20)

  1. Screen for screening material occurring in the production of paper, board and the like, particularly for screening mechanical pulp, chemical pulp, deinked or non-deinked secondary fibres, broke; for cleaning and fractionating pulp, for white water treatment, for removing impurities, particularly wood, stone, metal or plastic particles, ink, resins or similar, using a cylindrical screen basket (2) mounted in a casing (5) and with openings (204), e.g. slots, for the material to pass through, and a rotor (300) which is shaped either as a paraboloid of revolution, or as a cone or cylinder, having several blades (3, 3'), which can be moved closely along the wall of the screen basket (2) when the rotor rotates, where the material to be screened is fed in at the side of the screen basket (2) along which the blades (3, 3') move and where the blades (3, 3') have convex curvature on the surface (30, 30') facing the screen basket, where the radial clearance (ar) between the frontmost / leading sector (31), viewed in the direction of rotation (dr), particularly the front end point or the front edge (310) of the surface (30, 30') of the blade (3, 3') facing the screen basket and the surface (20, 20') of the screen basket (2) facing this surface (30, 30') corresponds to a minimum clearance (arv) and rises to a maximum clearance (arh) towards the rearmost / trailing sector (33) or the rear edge (330) of the blades (3, 3'), and where the blades (3, 3') of the rotor (3), which is shaped as a paraboloid of revolution, cone or cylinder, are mounted in several rows one above the other, and offset in height and/or round the circumference, each in relation to the generatrix and/or circumferential lines of the screen basket (2) and where the individual blades (3) are secured by means of fastenings or retaining parts, e.g. screws or rivets, and/or using adhesive, soldered or welded connections, particularly renewably, to the carriers or web plates (382) extending outwards from the shaft (381) or the body of the rotor (300), characterised by a tangential plane (etf) at the front sector (31) of the surface (30, 30') facing the screen basket or at the area around the tip of the front edge (310) of the blade (3, 3') enclosing an angle (∝) of 0° to 15°, preferably 0° to 8°, particularly 0° to 2°, with a tangential plane (ets) at a radially corresponding generatrix (ezs) of the surface (20, 20') of the screen basket (2) facing the blade (3, 3'), where the individual blades (3, 3') are plate-type, with the same material thickness (ms) from the front edge or tip (310) to the rear edge (330), advantageously of 2 to 8 mm, particularly of 5 to 6 mm, and preferably the blades (3, 3') are made of bent sheet metal, and the individual blades (3) have largely triangular, deltoid, trapezoidal or dovetail contours in a horizontal projection.
  2. Screen according to Claim 1, characterised by the curvature(s) of the surface (30) formed vertically to the axis (a3) of the rotor (300) being larger than the corresponding curvature of the inner surface (20) of the screen basket (2) facing the surface (30) if the rotor (300) is mounted with blades (3, 3') inside the screen basket (2), and by the curvature(s) of the surface (30') being smaller than or equal to the curvature of the outer surface (20') of the screen basket (2) facing the surface (30') if the blades (3') are mounted outside the screen basket (2).
  3. Screen according to Claim 1 or 2, characterised by the surface (30, 30') of the individual blades (3, 3') facing the screen basket having a larger curvature in a sector (31) beginning at the front tip or front edge (310) than in the sector (33) trailing after this sector (31), where preferably the curvature of the surface (30, 30') of the blade (3) facing the screen basket is greater at the front sector (31) by 5% to 20%, preferably by 10% to 15%, than the curvature of the surface (20, 20') of the screen basket (2) facing it and by the curvature of the surface (30, 30') of the blade (3,3') facing the screen basket being greater in its trailing sector (33) by 0% to 9%, preferably by 0% to 4%, than the curvature of the surface (30, 30') of the screen basket (2) facing it, and where preferably the transition zone from the preferably circular cylindrical curvature of the leading sector (31) of the blade (3, 3') to the preferably circular cylindrical curvature of the trailing sector (33) extends over the middle third of the length of the blade (3, 3'), with the transition from the more strongly curved, leading sector (31) to the less curved trailing sector (33) taking place steadily.
  4. Screen according to one of Claims 1 to 3, characterised by the surface (30, 30') of the blades (3, 3') facing the screen basket having generatrices which run largely parallel to the axis (a3) of the rotor (300).
  5. Screen according to one of Claims 1 to 4, characterised by the face end (310) of the blades (3, 3') being shaped largely as a narrow rectangle, where the two front corners (3101, 3102) may be rounded off.
  6. Screen according to one of Claims 1 to 5, characterised by the contour of the blades (3, 3') or of the surfaces (30, 30') being narrower in a horizontal projection in the leading front sector (310), viewed in the direction of rotation (dr), than in the area of the rear edge (330).
  7. Screen according to one of Claims 1 to 6, characterised by the blades (3, 3') having side edges (35) shaped in a straight or curved, convex or concave line and/or in steps, beginning at a front tip or narrow front edge (310) and diverging at an angle (ω) towards the rear, and by preferably the two side edges (35) extending from the front tip or front edge (310) of the blade (3, 3'), particularly in a straight line and diverging towards the rear, or the linear sections of the two side edges (35), together enclosing an angle (ω) of 40° to 120°, preferably of 60° to 90°.
  8. Screen according to one of Claims 1 to 7, characterised by the surface (30, 30') of the blades (3, 3') facing the screen basket having strip-like elevations or straight-line recesses (308) spaced at a certain distance from one another, running at an acute angle (γ), preferably of 10° to 45°, particularly of 15° to 30°, to the generatrix (ezf) of this surface (30, 30'), and which are formed by attaching, e.g. soldering, welding or gluing on, strip or rod-shaped elements to the surface (30, 30') or by cutting or shaping grooves in the blade material, e.g. by milling.
  9. Screen according to one of Claims 1 to 8, characterised by the individual blades (3, 3') on the rotor (300) being arranged in the shape of an ascending spiral line, viewed in the direction of rotation (dr).
  10. Screen according to one of Claims 1 to 9, characterised by the rotor (300) consisting of several rotor modules that are similar to each other, especially detachably connected with each other and that carry blades (3, 3').
  11. Screen according to one of Claims 1 to 10, characterised by the rotor (300) having several blade supports (380) on carriers, web plates (382) extending outwards from its shaft or the rotor body (381), mounted with uniform clearance to one another, preferably extending in the direction of the generatrix of the periphery of the rotor (300), on which blade supports (380) the blades (3') are mounted.
  12. Screen according to one of Claims 1 to 11, characterised by the ratio of the minimum clearance (arv) to the maximum clearance (arh) between the surface (30, 30') of a blade (3, 3') and the screen basket (2) being 0.05 to 0.5, preferably 0.1 to 0.3.
  13. Blade for screens used for screening material occurring in the production of paper, board and the like, particularly for screening mechanical pulp, chemical pulp, deinked or non-deinked secondary fibres, broke; for cleaning and fractionating pulp, for white water treatment, for removing impurities, particularly wood, stone, metal or plastic particles, ink, resins or similar, particularly according to one of Claims 1 to 12, where the surface (30, 30') of such blade (3, 3') facing the screen basket has a convex curvature, characterised by the blade (3, 3') being shaped as a bent or curved plate, with the same material thickness (ms) from the front edge or tip (310) to the rear edge (330), advantageously of 2 to 8 mm, particularly of 5 to 6 mm, where the blade (3, 3') is made of bent sheet metal, and blade (3) has largely, triangular, deltoid, trapezoidal or dovetail contours in a horizontal projection.
  14. Blade according to Claim 13, characterised by the surface (30, 30') of the blade (3, 3') facing the screen basket showing stronger curvature in a leading sector (31) beginning at the front tip or front edge (310) than in the sector (33) trailing after this sector (31), where preferably the transition zone from a preferably circular cylindrical curvature of the leading sector (31) of the blade (3, 3') extends into a preferably circular cylindrical curvature of the trailing sector (33) in the middle third of the length of the blade (3, 3'), with the transition taking place steadily.
  15. Blade according to one of Claims 13 or 14, characterised by the face end (310) of the blade (3, 3') having a largely narrow rectangular profile, where the two front corner edges (3101, 3102) may be rounded off.
  16. Blade according to one of Claims 13 to 15, characterised by the contour of the blade (3, 3') or of the surfaces (30, 30') being narrower in a horizontal projection in their leading sectors (310), viewed in the direction of rotation (dr), than at the rear edge (330).
  17. Blade according to one of Claims 13 to 16, characterised by the sides (35) of the blade (3, 3') diverging towards the rear from a front tip or narrow front edge (310) at an angle (ω) and having sections shaped in a straight or curved, convex or concave line and/or in steps, where the two side edges (35) or straight sections of the two side edges (35) extending especially in a straight line and diverging towards the rear from the front tip or front edge (310) of blade (3, 3') may enclose an angle (ω) of 40° to 120°, preferably of 60° to 90°.
  18. Blade according to one of Claims 13 to 17, characterised by the surface (30, 30') of the blade (3, 3') facing the screen basket having strip-like elevations and/or straight-line recesses (308) spaced at a certain distance from one another, running at an acute angle (γ), preferably of 10 to 45°, particularly of 15 to 30°, to the generatrix of this surface (30, 30'), and which are formed by attaching, e.g. soldering, welding or gluing on, strip or rod-shaped elements to the surface (30, 30') or by cutting or shaping grooves in the blade material, e.g. by milling.
  19. Blade according to one of Claims 13 to 18, characterised by the blade (3, 3') being connected to a carrier element (383) attached to its inner surface (3001), on which fastening devices, e.g. sleeves, recesses, drill holes, shoulders for mounting on carriers or web plates (382), are provided.
  20. Blade according to one of Claims 13 to 19, characterised by the blade (3,3 ') having screw holes (385) for screwing it to a carrier (382).
EP01107055A 2000-04-03 2001-03-21 Screen and foil for papermaking Expired - Lifetime EP1143065B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT01107055T ATE312230T1 (en) 2000-04-03 2001-03-21 SORTERS AND WINGS FOR PAPER MAKING

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT5522000 2000-04-03
AT0055200A AT408997B (en) 2000-04-03 2000-04-03 SORTERS FOR PAPER PRODUCTION AND WINGS FOR SORTERS

Publications (3)

Publication Number Publication Date
EP1143065A2 EP1143065A2 (en) 2001-10-10
EP1143065A3 EP1143065A3 (en) 2001-12-19
EP1143065B1 true EP1143065B1 (en) 2005-12-07

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EP01107055A Expired - Lifetime EP1143065B1 (en) 2000-04-03 2001-03-21 Screen and foil for papermaking

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US (1) US6588599B2 (en)
EP (1) EP1143065B1 (en)
CN (1) CN1205382C (en)
AT (2) AT408997B (en)
BR (1) BR0101296A (en)
CA (1) CA2342436A1 (en)
DE (1) DE50108272D1 (en)
ES (1) ES2252103T3 (en)
MX (1) MXPA01003401A (en)

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DE102005016192A1 (en) * 2005-04-08 2006-10-12 Voith Paper Patent Gmbh Process for dissolving and cleaning contaminant-containing paper tubes
US20070045157A1 (en) * 2005-08-29 2007-03-01 Kajzer Wieslaw C Recovery of pin chips from a chip washing reject stream
WO2007094967A1 (en) * 2006-02-16 2007-08-23 Kadant Black Clawson Inc. Pulb screen foil and method of use
FI120913B (en) † 2007-09-28 2010-04-30 Andritz Oy Device for sorting of pulp
FI121672B (en) * 2008-10-15 2011-02-28 Advanced Fiber Tech Aft Trust Process for manufacturing a rotor for a screening device and a rotor
DE202009003995U1 (en) * 2009-03-25 2010-08-19 Hugo Vogelsang Maschinenbau Gmbh cutter
FI125599B (en) 2010-11-12 2015-12-15 Valmet Technologies Inc Sheet of fiber pulp sorting machine, fiber pulp sorting machine and method for sorting fiber pulp
CN102383329B (en) * 2011-09-30 2013-08-28 杭州萧山美特轻工机械有限公司 Scattering pressure screen
DE112013002676T5 (en) * 2012-05-25 2015-03-19 Aikawa Fiber Technologies Trust Rotor element and rotor for a screening device
DE102013216433A1 (en) * 2013-08-20 2015-03-12 Voith Patent Gmbh pressure screens
DE102014217275A1 (en) * 2014-08-29 2016-03-03 Siemens Aktiengesellschaft Rotor for a gantry of a computed tomography device
CN104358175B (en) * 2014-12-10 2016-03-02 新乡航空工业(集团)新平机械有限公司 Pressure sieve rotor, pressure sieve rotor manufacture method and use the pressurized screen of this rotor
AT518213B1 (en) * 2016-02-03 2018-06-15 Andritz Ag Maschf ROTOR WING AND SORTER WITH ROTOR WING
CN106381746B (en) * 2016-11-18 2019-05-31 广西大学 A kind of pressure sieve rotor rotor
CN110026332B (en) * 2019-04-04 2024-03-19 浮得净(浙江)科技有限公司 Intelligent flotation feeding online granularity control screen device
CN110373930A (en) * 2019-08-12 2019-10-25 山东晨钟机械股份有限公司 A kind of fine screen rotor and fine screening machine
KR102379138B1 (en) * 2020-11-03 2022-03-25 이강훈 Coffee brewing Method and Apparatus by Mixing force
CN114850024B (en) * 2021-11-01 2023-09-01 湖南恒信伟业建材有限公司 Broken stone split charging treatment equipment for building stones and application method thereof
TWI760290B (en) * 2021-11-08 2022-04-01 聯策科技股份有限公司 Plant fiber extraction machine
CN114247640B (en) * 2021-12-06 2024-03-01 安徽东方钙业有限公司双桥石灰石矿 Roller screen maintenance equipment of shaftless sand screening machine for soil-stone separation technology
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CN116197117B (en) * 2023-02-27 2024-08-30 安徽卧龙泵阀股份有限公司 High-temperature-resistant composite material of pump body anti-corrosion lining and processing device thereof

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Also Published As

Publication number Publication date
EP1143065A3 (en) 2001-12-19
DE50108272D1 (en) 2006-01-12
ES2252103T3 (en) 2006-05-16
ATE312230T1 (en) 2005-12-15
AT408997B (en) 2002-04-25
EP1143065A2 (en) 2001-10-10
US20010045379A1 (en) 2001-11-29
MXPA01003401A (en) 2007-07-25
US6588599B2 (en) 2003-07-08
BR0101296A (en) 2001-11-06
ATA5522000A (en) 2001-09-15
CN1205382C (en) 2005-06-08
CN1318433A (en) 2001-10-24
CA2342436A1 (en) 2001-10-03

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