EP1143065A2 - Screen and foil for papermaking - Google Patents

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

The present invention relates to a novel sorter according to the Preamble of claim 1.

Such sorting plants for the separation of for the production of paper, Cardboard u. Like. Provided fiber, in particular wood material from disruptive Particulate contaminants are in various embodiments become known and are used worldwide in the paper industry.

Sorters are known in which blades arranged on a rotor in Have an aircraft wing similar cross-sectional shape, which starts from a bulge-like curve in the direction of rotation, backwards converges and ends in a narrow, teardrop shape. These wings extend are in the form of strips and have a length corresponding to the rotor or sieve basket Length on. In general, a cylindrical rotor is provided. Both known sorters is that for the passage of the fiber particle suspension provided screen basket facing surface of the wing in the way curved that the radial distance between the functional Wing surface and the facing screen basket surface in the leading area of the Wing first reduced to a minimum. After a short, about The constant minimum distance to the screen basket surface facing increases radial distance to the rear end or to the end edge of the wing again on. This is to achieve that in the front, the decreasing distance to the strainer area of the wing, a kind back pressure-assisted squeezing of the sorting material suspension through the Openings of the strainer basket is reached. In the rear, trailing area of the wing, which increases from the screen basket surface facing it Measurements removed, a kind of pulling effect on the previous one is already on the other Side of the sieve basket pressed to hold a back and To achieve a rinsing effect on the strainer. This suction effect is known and it So far, experts have believed that a cross-sectional form of Wings, like a narrow, curved drop, for effectiveness of the rotor and the blades for a high backwashing effect and for the achievement the lowest possible flow resistance when moving the wing is optimal through the pulp.

In addition to the state of the art, there are two basic types of sorters exist, namely on the one hand sorters with one from the inside Sorting material suspension for loadable sieve basket and within the sieve basket horizontal blades, so "centrifugal sorter", and on the other hand with sorter rotating outside the strainer basket and the same a short distance outside sweeping wings, with these so-called "centripetal sorters" the goods to be sorted are fed to the screen basket from the outside and the removal of the cleaned fiber suspension from the inside.

For centripetal sorters with an internal sieve basket and an external one The rotary shaft of the rotor carries wings in the inlet-side or upper area of the strainer basket, such as a star or disc-shaped carrier with downwardly projecting projections on which the wings rotating around the strainer basket are attached.

The present invention is based on the observation that the previously usual design of the screen-near surface of the wing in the form of a Wing area, in particular in the leading area of the wing intended reduction in distance between sash and strainer, neither from fluidic and energetic view still with regard to effectiveness of Separation process, throughput quantities and separation performance is optimal.

It was unexpectedly found that, with a corresponding change, the Distance ratios between the face of the screen basket individual wings and the screen basket surface facing the respective wing and also remarkable due to the special choice of the cross-sectional shape of the wings Improvement of the operating results and the quality of the cleaned goods can be achieved.

The invention thus relates to a sorter as described at the beginning, the by the features stated in the characterizing part of claim 1 is characterized.

Due to the arrangement of the individual wings or by the continuous increase in the distance between the screen basket and the Any pressure build-up is avoided on the wing surface. It has been shown that on the sorting material suspension for its passage through the sorter Exerted pressure is quite sufficient to get enough large amounts Push the pulp suspension through the openings of the screen basket and that there is no additional pressure increase from one specifically for it reducing distance to the screen basket area formed the Rotor blades are required to make this process effective.

Rather, by the now of the entire wing due to the backwards increasing distance to the screen basket surface caused increased Suction effect a much more effective backwashing and thus lifting the from Particles or contaminants separated from the screen basket wall reached. The wings arranged and designed according to the invention practice their entire length and extension in the direction of rotation, i.e. over the entire surface, in the Fibrous suspension a relative to their other pressurization in the Housing of the sorter lower pressure or "negative pressure". With that the Suck back on a part of the already through the openings of the strainer passed fiber suspension increased, and there is a Backwashing through the openings in the strainer basket. Thanks to the improved take-off of the retained impurities improves the separation behavior and the separation performance of the sorters according to the invention. By the staggered The arrangement of the individual wings is practically at any time at any point swirling of the strainer basket and thus cleaning of the strainer basket surface. In the case of a rotary paraboloidal rotor, the flow from Entry can be managed cheaply.

• 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 Einzelflügel 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.

The main advantages of the sorters and the wings according to the invention are as follows:

• Lower energy consumption due to lower pressure build-up in the start area of the wing and thus lower flow resistance.
• Lower pulsation generation by positioning the narrowest flow cross-section between the wing and screen basket wall directly on or in the area of the leading edge of the wing.
• Generation of high turbulence at the edges of the individual wings and thus improved sieve exposure for high throughput and separation performance.
• Small 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 therefore lower energy consumption.

According to claim 2 it is provided that the run-up area or the leading area of the wing includes practically no or only a small angle with the minimally spaced screen basket surface. Because of this, a high backwashing rate and an effective lifting of particle material from the screen basket surface can be achieved within the ranges of the intended angles due to an increased suction effect.

The curvature of the surface of the wing facing the strainer basket is important for the desired backwashing or the suction effect. It has been shown that an improved degree of backwashing can be achieved if different curvatures are formed in the front and rear areas of the individual wing in the direction of rotation, i.e. when the features of claim 5 are realized, the choice of different curvatures for the different areas of the the wing surface facing the screen basket allows a good adaptation of the wing surface to different operating conditions and material compositions. In this context, the features of claim 15 are also advantageous.

During in-depth investigations to optimize the cross-sectional shape of the rotor blades, it was found that the previously customary, costly design of the rotor blades with an aerofoil-like cross section, which is also relatively complex in terms of their technical implementation, is not only not necessary but can even hinder effectiveness. The features of claim 4 describe a simpler, inexpensive to manufacture and effective embodiment of the wing. The lower centrifugal forces due to the plate-like cross-sectional shape of the wing, which avoids the shape of an aerofoil, make it possible for the first time for a cost-saving lightweight construction, which also enables the use of lighter wing brackets.

In terms of effectiveness in separating the fiber suspension from the impurity particles, it has proven to be advantageous if the features of claim 5 are realized.

Furthermore, it has been shown that certain design details are able to increase the advantageous effects of the present invention. This applies for example to the design of the front edge in the direction of rotation of the rotor blades according to claim. 7

Various contour shapes have proven to be favorable for the shape or shape of the wing surface. Corresponding features can be found in claims 8, 9 and 10, which allow favorable flow conditions and separation results to be achieved. In the case of a stepped contour, the steps or serrations do not have to be arranged along a straight line, but can have a concave or convex overall curve. In the sense of the invention, the contour of the wing that widens from the front to the rear can again have edges that converge towards one another in its rear third. The described contour shapes of the wings also contribute to reducing the flow resistance as they move through the fiber suspension.

It was also found that the suction effect can be increased if - as provided for in claim 11 - it is ensured that the Wing surfaces extending transversely to the direction of rotor rotation, such as strip-like Have surveys, behind which one in comparison to the usual Suction of the wing surface occurs locally increased suction.

In practice, rotors with blades according to claim 12 have proven to be effective.

The rotor itself can be made in one piece. Appropriately, one Be embodiment in which a plurality of individual rotor modules to a rotor any axial extent are composed, as in claim 13 is specified.

With regard to the fastening of the blades to the rotor or to the supports or webs carried by its shaft, reference is made to claim 14, the features of which allow high robustness in operation and mechanical stability to be achieved.

The invention further relates to a wing according to the preamble of claim 16. In the case of the conventional wings, it is to be regarded as a disadvantage that they are solid and heavy, in particular because these wings are of wing-shaped cross section. To avoid these disadvantages, the wings mentioned are characterized according to the invention by the features stated in the characterizing part of claim 16. With such a structure of the wings, it becomes possible to manufacture the wings in a lightweight construction and to give the wings the desired shape in a simple manner, and to adapt them to different purposes.

It is particularly advantageous if the features of claims 23 and / or 24 are met, since it is thus possible to easily replace the blades in a sorter, in particular in order to be able to use blades that are adapted to different speeds of the rotor or different material suspensions are.

The invention is explained in more detail with reference to the drawing:

1, 2 and 3 each show schematic sectional views of sorters according to the state of the art. Fig. 4 shows the sectional view of the same State-of-the-art designed rotor blade. Fig. 5 shows schematically shows a sectional view of a wing of one within the screen basket arranged rotor of a sorter according to the invention. Fig. 6 shows schematically shows a sectional view of an outside around an inner screen basket rotating wing. 7, 8 and 9 schematically show various Arrangements of wings. 10 to 16 each show top views wings according to the invention with different contours. Fig. 17, 18 and 19 show attachment options of blades on rotors.

The sorter 100 shown schematically in FIGS. 1 and 2 in a horizontal and a vertical sectional view has a housing 5 with an inlet 51 for a sorting material suspension with an outlet 52 for accepting foreign matter freed from foreign particles. An outlet 53 or the like is arranged at the base of the housing 5 for the removal of the contaminants separated from the sorted material. In the interior 500 of the approximately barrel-shaped or cylindrical housing 5, a cylinder-shaped strainer basket 2 with hole-like or slot-like passage openings 204 for the cleaned fibrous suspension is arranged concentrically. In the interior 200 of the strainer basket 2, an essentially rotationally paraboloidal or conical or cylindrical rotor 300 is rotatably mounted on a shaft 381 driven by a motor 6 about a vertical axis of rotation a3. From the rotor 300, webs 382 extend, in particular radially, each of which has a wing 3 which can be guided past the inner surface 20 of the screen basket 2 at its end near the screen basket. The sorted material fed in under pressure through the inlet 51 arrives here in the interior 200 of the screen basket 2, which is increasingly narrow in its cross section due to the paraboloidal shape of the rotor 300. The accepted material, comprising the fine-fiber, contamination-free material, is removed under the effect of the the fiber suspension introduced pressure is pressed through the openings 204 of the screen basket 2 to the outside into the interior 500 of the housing 5 surrounding the screen basket 2, from which the suspension is discharged via the outlet 52. The openings 204 of the sieve basket 2 are dimensioned such that the foreign material particles contained in the sorting material suspension, such as glass fragments, coarser sand particles, small stones, metal particles or the like, remain in the sieve basket 2, in particular on its inner surface 20 in the area of the passage openings 204 concerns. Without appropriate countermeasures, the openings 204 would become clogged and the passage of the fine-fiber, fine-particle suspension free of foreign particles would be prevented. To prevent this, the known wing 3 are aircraft wing-like cross-section approximately and their direction of rotation dr 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 to the suspension of. A backwashing of a small portion of the accept material suspension which has been filtered through the strainer basket 2 or pressed outward immediately before is thus achieved back into the strainer basket 2. As a result of this backwashing, the foreign particles laying the openings 204 are detached from the inner surface 20 of the strainer basket 2, sink to the bottom of the strainer basket 2 and finally reach the outlet 53.

The sorter 100 shown in FIG. 3 operates according to the working principle of the sorter 100 shown in FIGS. 1 and 2, the inverse principle. The housing 5 has an inlet 51 at the bottom for fiber suspension to be sorted, an overhead drain 52 for the freed of contaminants Fibrous suspension and also a relatively high outlet 53 for Impurities. 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 The end of the rotor 300 is a carrier disk or it is radial in a star shape outgoing arms or webs 382 stored. From the support disk or the arms 382 go down wing carrier 380, which protrude inwards Wear wing 3 '. The inner surfaces 30 'of the wings 3' rotate around the screen basket 2 or around its outer surface 20 'at a relatively short distance. The separation of Acceptable substances and impurities take place in the same way as in connection with the Fig.1 and 2 described. Also in the known one shown in FIG. 3 The sorter 3 'having the structure of the sorter 3' is essentially approximately designed wing-shaped and show the above-discussed disadvantages of increased Energy consumption and less than optimal backwashing and therefore less effective cleaning of the strainer basket 2 or exposure of the openings 204.

The schematic drawing according to FIG. 4 shows a part of the screen basket 2 with its through openings 204 for the accept material suspension. The radial distance ar of the surface 30 of the wing 3 near the strainer basket from the inner surface 20 of the strainer basket 2 changes over the length of the wing 3. The wing 3, which is wing-like in cross section, has a relatively large radial distance at its front edge 310 and / or in the foremost run-on area 31 arv on. Between this run-up area 31 of the wing 3 and a relatively narrow central zone 32, the radial distance ar decreases to a minimum distance arm. The radial distance ar from the zone 32 to the rear region 33 or to the end edge 330 increases to a maximum value arh. In the area of the front edge 310 above the front area 31, a pressure build-up extends to the zone 32 when the wing 3 is moved in the direction of rotation dr. Only in the wake area 33, in which the distance between the surface 30 and the surface 20 of the screen basket 2 increases, is the suction effect important for the backwashing of the impurities created. The wing 3 is formed on the inside with a flat surface 3001.

Detailed investigations have shown that the wing shape of the Blade 3 in terms of the energy required to rotate the rotor 300, the Effectiveness of backwashing and keeping the passage openings 204 free Foreign particles is not optimal. Because of the wing-like cross section having wing 3 according to the prior art in the direction of rotation dr one its distance ar approximately into the region of the height of the web 382 (FIG. 1) has reducing startup area 31, there is a rotation preventive back pressure counteraction in the fiber suspension, which the Energy expenditure for the rotation increased. It also stands for backwashing only a part of the suction effect required to clean the screen basket openings 204 entire wing surface 30, namely the trailing area 33, is available.

The shown in FIG. 5 in a sectional view, arranged according to the invention and formed wing 3 has one of the cylindrical surface 20 of the Screen basket 2 facing convexly curved outer surface 30. The wing 3 is plate-shaped, e.g. from a sheet or plastic material with constant thickness or material thickness ms, formed. Advantageously The inner surface 3001 runs parallel to or have the outer surface 30 both surfaces 30 and 3001 have the same curvature.

The thickness of the wing 3 is in practice about 5 to 6 mm, the diameter the screen basket 2 is usually 400 to 3000 mm, its height is about 500 up to 1500 mm.

5 are three examples of a preferred one Design of the front edge 310 of the wing 3 can be removed, the end face according to a) rectangular cross-section, according to b) a similar one Cross-sectional shape with rounded edges 3101 and one according to sketch c) Rounding 3102 shows.

The wing 3 according to the invention, which differs significantly from the wings according to the prior art, is positioned relative to the course of the facing surface 20 of the screen basket 2 in such a way that the surface 30 of the wing 3 extends ever further from its front edge 310 to the end edge 330 20 removed or the radial distance ar increases from front to back. The smallest radial distance arv is at the front edge 310, the maximum distance arh at the rear end edge 330.

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 region 31 and the trailing region 33 of the surface 30 of the wing 3. The surface 30 advantageously has in the region of the front end edge 310 an almost parallel course to surface 20. A tangential plane etf applied directly in the area of the front edge 310 to the front area 31 includes an acute angle α of a few degrees with the radially corresponding tangential plane ets , which is determined by the radius rf1 of the curvature in the area of the front edge 310.

The radial distance ar of the surface 30 increases continuously from the minimum distance arv to a maximum distance arh , and this "inclination" of the wing 3 with respect to the direction of rotation dr or relative to the strainer basket 2 is the suction effect effective for backwashing during the movement of the wing 3 relative to the strainer basket 2 ensured over the entire wing extension in the direction of rotation dr .

According to a special embodiment, it can 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, a transition region being provided in the intermediate zone 32 between the two different curvatures. An edge approximately following the course of a generatrix of the surface 30 between the more curved run-up region 31 and the less strongly curved outlet 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 advantageous changes in the flow conditions and leads to favorable pressure changes in the suspension. The curvatures are preferably circular cylindrical, but can also be oval or elliptical.

It is of particular advantage if the end region 31 leading to the front end surface near the screen basket 30, 30 'or to the vicinity of the tip or

Front edge 310 of the wing 3, 3 'applied tangential plane etf an angle α of 0 to 15 °, preferably 0 to 8 °, in particular 0 to 2 °, with the radially corresponding generatrix ezs facing the wing 3, 3' Surface 20, 20 'of the strainer basket 2 includes the tangential plane ets . This results in a streamlined course of the surface 30 and a good suction effect. This dimensioning applies to wings 3, 3 'running inside and / or outside the strainer basket 2.

It may be expedient if the curvature of the surface 30 of the screen basket Wing 3 in its front or leading region 31 by 5 to 20%, preferably by 10 to 15%, greater than the curvature of the facing Surface 20 of the strainer basket 2 and if the curvature of the surface near the strainer basket 30 of the wing 3 in its trailing 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 the outside the screen basket 2 rotating wings 3 'with surfaces 30', which have a smaller Have curvature as the outer surface 20 'of the screen basket 2 and with it convex surface 30 'of the outer surface 20' of the screen basket 2 are facing. With Dashed lines indicate that the curvature of the wing 3 'in front area 31 'may also be "infinite" in size, i.e. that the angle α at the end edge 310 could assume the limit value 0 °.

7 shows a rotor 300 with a height offset from one another, wings zig-zag-shaped, designed according to the invention 3. In FIG. 8 is a rotor 300 with circumferentially offset from one another Wings 3 shown. 9 shows a rotor equipped according to the invention 300 with wings 3 arranged along a rising spiral line.

10 to 16 show wings 3, 3 'designed according to the invention with the row after trapezoidal, triangular and generally trapezoidal overall contour. The Wing 3 according to FIG. 12 has 30 arranged on its surface, at an angle γ to Direction of the wing generating ezf, in this case approximately parallel to strip-like swirling elevations 308 arranged at the lower side edge 35. Instead of the elevations 308, groove-shaped depressions in the wing 3 can also be used be formed.

The side edges 35 that diverge against the direction of rotation dr included angle ω is 20 to 60 °, preferably 25 to 50 °. The approximately strip-like elevations 308 or the depressions on the surface 30 of a Wing 3 trigger 3 local vacuum vortices when the wing moves, which support the detachment of firmly adhering foreign matter particles from the strainer basket 2.

13, the side edges 35 are angled convexly formed, the to the front, short transverse edge 310 directly subsequent sections 351 enclose the angle ω with one another. The Side edges 35 of wing 3 of FIG. 14 are in the form of uniform steps 352 executed. The step-like formation of the side edges 35 brings one substantial increase in their overall length, thus promoting the turbulence of the Fibrous suspension during the rotation of the wings 3.

The contour shape of the wing 3 of FIG. 15 has diverging in the front area Side edges 35, which follow approximately in the rear third of the surface 30 begin to turn inside and backwards 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.

17, 18 and 19 diagrammatically show wings 3, 3 'which are on different ways with the arms coming from the rotor 300 or Crosspieces 382 or carriers 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 FIGS. 17 and 18 is on a foot part 383 is molded onto the wing 3, 3 '. 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. Lateral projections 387 take the lateral ones Limits 388 of the recess 385. The connection between the Projection 386 and the recess 385 - as indicated - with one Screw.

In the embodiment of the wing 3, 3 'according to FIG. 18, the end region of the Base part 383 provided with a projection 389, which with a projection 390 of the web 382 cooperates. The projections 389 and 390 are - as with 384 indicated - screwed together.

According to FIG. 19, the wing 3, 3 'can be attached by means of screws indicated at 384 a supporting part 391 fastened to the carrier or web 382 can be screwed.

The illustrated embodiments allow simple replacement of the Wing 3,3 'so that a sorter provided with such wings quickly different operating conditions can be adapted.

Claims (24)

Sorter for the sorting material resulting from the production of paper, cardboard or the like, in particular for the sorting of wood pulp, cellulose, deinked and undinked secondary fiber material, rejects, for cleaning and fractionation of material, for white water treatment, for the separation of impurities, in particular from Wood, stone, metal or plastic particles, printing inks, resins or the like, with a cylindrical screen basket (2) arranged in a housing (5) with passage openings (204), for example slits, and one of a plurality of wings (3,3 ') supporting rotary paraboloidal, conical or cylindrical rotor (300), when rotating the blades (3,3') can be moved a short distance along the wall of the screen basket (2), with the goods to be sorted on that side of the strainer basket (2) is supplied, past which the wings (3, 3 ') are moved and the wings (3, 3') are convexly curved on their surface (30, 30 ') near the strainer basket, thereby characterized chnet that the radial distance (ar) between the front or leading end area (31) in the direction of rotation (dr), in particular the front end point or the front edge (310) of the surface (30, 30 ') of the wing (3, 3') ), and the surface (20, 20 ') of the screen basket (2) facing this surface (30, 30') corresponds to a minimum distance (arv) and to the rearmost area (33) or to the end edge (330) of the wings (3, 3 ') increases to a maximum distance (arh), the blades (3, 3') of the rotor (3) preferably being arranged in several rows one above the other and in terms of height and / or circumference, in each case based on generators and / or circumferential lines of the screen basket (2 ), are arranged offset and preferably the wings (3) on the supports or webs (382) extending from the shaft (381) or the body of the rotor (300) with fastening devices, for example screws or rivets, and / or by means of adhesive , Soldered or welded connection, in particular replaceable, are attached. Sorter according to Claim 1, characterized in that a tangential plane (etf) applied to the front end region (31) of the surface (30, 30 ') near the screen basket or to the vicinity of the tip of the front edge (310) of the wing (3, 3') an angle (α) of 0 to 15 °, preferably 0 to 8 °, in particular 0 to 2 °, with a radially corresponding generatrix (ezs) of the surface (20, 20) facing the wing (3, 3 ') ') of the strainer basket (2) includes the tangential plane (ets). Sorter according to claim 1 or 2, characterized in that when the rotor (300) is arranged with the blades (3, 3 ') within the screen basket (2), the curvature (s) formed perpendicular to the axis (a3) of the rotor (300) (s) of the surface (30) is (are) larger than the corresponding curvature of the inner surface (20) facing the surface (30) of the strainer basket (2) and that when the wings (3 ') are arranged outside the strainer basket (2) Curvature (s) of the surface (30 ') is (are) less than or equal to the curvature of the outer surface (20') of the screen basket (2) facing the surface (30 '). Sorter according to one of claims 1 to 3, characterized in that the individual wings (3, 3 ') plate-like, preferably with a constant material thickness (ms) from the front edge or tip (310) to the end edge (330), advantageously with a thickness of 2 to 8 mm, in particular of 5 to 6 mm, and preferably the wings (3, 3 ') are made of bent sheet metal, in particular with the outer and inner sides parallel to one another. Sorter according to one of claims 1 to 4, characterized in that the screen basket-near surface (30, 30 ') of the individual wings (3, 3') in a region (31) starting at the front tip or front edge (310) has a greater curvature than in the area (33) lagging this area (31), the curvature of the surface (30, 30 ') of the wing (3) near the screen basket in the front area (31) preferably being 5 to 20%, preferably 10 to 15 %, is greater than the curvature of the facing surface (20, 20 ') of the strainer basket (2) and that the curvature of the surface (30, 30') of the wing (3, 3 ') near the strainer basket in its trailing region (33) 0 to 9%, preferably by 0 to 4%, is greater than the curvature of the facing surface (30, 30 ') of the screen basket (2) and preferably the zone of transition from the preferably circular-cylindrical curvature of the leading area (31) of the Wing (3,3 ') in the preferably circular cylindrical curvature of the lagging Be rich (33) runs in the middle third of the longitudinal extent of the wing (3, 3 '), the transition from the more curved, leading area (31) to the less curved, trailing area (33) taking place continuously. Sorter according to one of Claims 1 to 5, characterized in that the surface (30, 30 ') of the wings (3, 3') near the strainer basket has generatrixes which run essentially parallel to the axis (a3) of the rotor (300). Sorter according to one of claims 1 to 6, characterized in that the end face (310) of the wings (3, 3 ') is of essentially narrow rectangular shape, the two front corner edges (3101, 3102) optionally being rounded. Sorter according to one of claims 1 to 7, characterized in that the contour of the wings (3, 3 ') or of the surfaces (30, 30') is formed narrower in plan view in their end region (310) leading in the direction of rotation (dr) than in the area of the end edge (330). Sorter according to one of claims 1 to 8, characterized in that the individual wings (3) have a substantially triangular, deltoid, trapezoidal or dovetail contour in plan view. Sorter according to one of claims 1 to 9, characterized in that the wings (3,3 '), starting from a front tip or narrow front edge (310) at an angle (ω) backwards to be diverged and extending in a straight line or curved, have bulging or recessed and / or stepped side edges (35) and preferably the two, from the front tip or the front edge (310) of the wing (3, 3 '), in particular straight and diverging to the rear extending side edges (35) or the linear sections of the two side edges (35) form an angle (ω) of 40 to 120 °, preferably of 60 to 90 °. Sorter according to one of claims 1 to 10, characterized in that the screen-near surface (30, 30 ') of the wings (3, 3') at an acute angle (y), preferably from 10 to 45 °, in particular from 15 to 30 °, for generating (ezf) this surface (30, 30 '), spaced apart, strip-like elevations or rectilinear depressions (308), which by attaching, for example soldering, welding or gluing, strip or rod-shaped elements onto the surface (30, 30 ') or by removing or by forming grooves in the wing material, for example by milling. Sorter according to one of claims 1 to 11, characterized in that the individual blades (3, 3 ') on the rotor (300) in the direction of rotation (dr) are arranged in the form of an increasing spiral line. Sorter according to one of claims 1 to 12, characterized in that the rotor (300) is constructed with a plurality of rotor modules which are identical, in particular releasably connected to one another and carry wings (3, 3 '). Sorter according to one of claims 1 to 13, characterized in that the rotor (300) a plurality of carriers, webs (382) carried by its shaft or the rotor body (381), equally spaced from one another, preferably in the direction of the generators of the periphery of the rotor (300) extending support strips (380) which carry the wings (3 '). Sorter according to one of claims 1 to 14, characterized in that the ratio of the minimum distance (arv) of the area (30,30 ') of a wing (3,3') from the screen basket (2) to the maximum distance (arh) 0, 05 to 0.5, preferably 0.1 to 0.3. Sash for sorters for the sorting material resulting from the production of paper, cardboard or the like, in particular for the sorting of wood pulp, cellulose, deinked and undinked secondary fibrous material, rejects, for cleaning and fractionating material, for treating white water, for separating contaminants, especially of wood, stone, metal or plastic particles. Printer inks, resins or the like, in particular according to one of Claims 1 to 20, in which wing (3, 3 ') the surface (30, 30') near the screen basket is convexly curved, characterized in that the wing (3, 3 ') ) in the form of a curved or curved plate, preferably with a material thickness (ms) which is constant from the front edge or tip (310) to the end edge (330), advantageously with a thickness of 2 to 8 mm, in particular 5 to 6 mm, is formed, wherein the wing (3, 3 ') is preferably formed from bent sheet metal, in particular with mutually parallel outer and inner surfaces. A wing according to claim 16, characterized in that the screen basket-near surface (30,30 ') of the wing (3,3') has a greater curvature in a leading region (31) starting at the front tip or front edge (310) than in FIG the area (33) lagging this area (31), preferably the zone of transition from a preferably circular-cylindrical curvature of the leading area (31) of the wing (3, 3 ') to a preferably circular-cylindrical curvature of the lagging area (33) in the middle Third of the longitudinal extent of the wing (3, 3 ') runs, the transition taking place continuously. Sash according to one of claims 16 or 17, characterized in that the end face (310) of the sash (3,3 ') has an essentially narrow rectangular profile, the two front corner edges (3101, 3102) optionally being rounded. Wing according to one of claims 16 to 18, characterized in that the contour of the wing (3,3 ') or of the surfaces (30,30') in plan view in their (end) leading (end) regions (310) ) is narrower than in the area of the end edge (330). Wing according to one of claims 16 to 19, characterized in that the wing (3) has a triangular, deltoid, trapezoidal or swallowtail contour in plan view. Wing according to one of claims 16 to 20, characterized in that the sides (35) of the wing (3,3 ') starting from a front tip or narrow front edge (310) at an angle (ω) to the rear and apart and straight or have curved, extending or bulging and / or stepped sections, where appropriate the two, from the front tip or the leading edge (310) of the wing (3, 3 '), in particular rectilinearly and diverging towards the rear, extending side edges ( 35) or rectilinear sections of the two side edges (35) form an angle (ω) of 40 to 120 °, preferably of 60 to 90 °. Wing according to one of claims 16 to 21, characterized in that the screen basket near surface (30,30 ') of the wing (3,3') at an acute angle (γ) preferably from 10 to 45 °, in particular from 15 to 30 ° , to produce this surface (30, 30 ') runs, spaced apart, strip-like elevations and / or rectilinear depressions (308), which by attaching, for example soldering, welding or gluing, strip or rod-shaped elements onto the surface (30 , 30 ') or by removing or by forming grooves in the wing material, for example by milling. Wing according to one of claims 16 to 22, characterized in that the wing (3,3 ') on its inner surface (3001) is connected to a supporting part (383) on which fastening devices, for example sleeves, recesses, bores, shoulders for mounting on supports or webs (382). Vane according to one of claims 16 to 23, characterized in that screw holes (385) for screwing onto a carrier (382) are formed in the vane (3, 3 ').

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