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EP0278260B1 - Screening apparatus - Google Patents

Screening apparatus Download PDF

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Publication number
EP0278260B1
EP0278260B1 EP88100660A EP88100660A EP0278260B1 EP 0278260 B1 EP0278260 B1 EP 0278260B1 EP 88100660 A EP88100660 A EP 88100660A EP 88100660 A EP88100660 A EP 88100660A EP 0278260 B1 EP0278260 B1 EP 0278260B1
Authority
EP
European Patent Office
Prior art keywords
screening
machine according
screen
compartment
rotor
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
EP88100660A
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German (de)
French (fr)
Other versions
EP0278260A2 (en
EP0278260A3 (en
Inventor
Walter Musselmann
Herbert Kinzler
Reimund Rienecker
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JM Voith GmbH
Original Assignee
JM Voith GmbH
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Filing date
Publication date
Application filed by JM Voith GmbH filed Critical JM Voith GmbH
Priority to AT88100660T priority Critical patent/ATE61429T1/en
Publication of EP0278260A2 publication Critical patent/EP0278260A2/en
Publication of EP0278260A3 publication Critical patent/EP0278260A3/en
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Publication of EP0278260B1 publication Critical patent/EP0278260B1/en
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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/18—Drum screens
    • B07B1/20—Stationary drums with moving interior agitators

Definitions

  • the invention relates to a sorting apparatus according to the preamble of patent claim 1.
  • a sorting apparatus according to the preamble of patent claim 1.
  • Such an apparatus has become known from GB 372 760.
  • the fiber suspension is passed through three structurally and functionally connected sorting units without pressure.
  • the orifice provided here between two adjacent sorting units represents a certain block for the flow of the suspension from a sieve space into the downstream one, in that this orifice exerts a throttling effect. A sensitive influence on the events in the two adjacent sorting units is not possible.
  • US Pat. No. 3,898,157 discloses an apparatus in which two sorting units are also provided. The entire facility is under pressure. With this facility, no precautions have been taken to properly process material suspensions with different production quantities and different levels of contaminants.
  • the machine used in the last stage of sorting has the task of separating the contaminant (rejects) from the usable fiber material.
  • the separation process must be carried out in such a way that on the one hand the fiber loss is as small as possible, but on the other hand the highest possible efficiency of the removal of impurities is achieved.
  • the last sorting level determines the efficiency of the entire sorting.
  • Known power stage sorters are e.g. Vibration sorter. These machines require relatively large screen areas and high material dilutions for the necessary screen perforations in order to achieve a reasonably satisfactory sorting effect. The sieves are very susceptible to clogging.
  • the invention has for its object to provide a sorting device according to the preamble of the main claim, which makes it easy to adapt to different production quantities and different levels of impurities even with the finest screen perforations, and which keeps the fiber losses during continuous operation of the device small.
  • the result is a simple construction with good variation possibilities, for example also by adjusting the aperture.
  • the sorting apparatus consists of two structurally and functionally connected sorting units 40 and 50.
  • the first sorting unit 40 has a cylindrical sieve 8, which encloses an annular sieve space 1, which is formed between the sieve 8 and a drum-like rotor part 5, which is the first sorting unit 40 assigned.
  • the inlet 19 for the suspension is located at the end of the first sorting unit 40 facing away from the second sorting unit 50, and an outlet from the accepting material space 2 surrounding the sieve 8 is designated by 18.
  • the rotor has sorting elements 16 in the form of wings or foils, which produce a good sorting effect. The rotor is driven via shaft 27 and is not shown here.
  • the second sorting unit 50 consisting of the outer accept material space 4, the inner, annular sieve space 3 or 3 ⁇ , the cylindrical sieve 9 and the rotor part 6 with the sorting elements 17, are shown here, however, simply as radial ribs.
  • the screen space is depressurized here and is freely connected to the atmosphere via its end 3 ⁇ via outlet 31.
  • a screen 11 is interposed between the screen spaces 1 and 3, which leaves a gap 12 on the rotor and thus influences the flow between the two screen spaces in terms of flow. This also maintains the excess pressure in relation to the surrounding atmosphere in the screen space 1.
  • the accepting material space 2 surrounding the sieve space 1 or sieve 8 is sealed off from the atmosphere by an outlet valve 30 on the outlet connection 18 and is thus kept under excess pressure.
  • the excess pressure is preferably between 0.4 and 1.6 bar.
  • the sorting apparatus could also be arranged with a vertical rotor axis.
  • annular disk 7 which acts as a diaphragm, is also provided in the second sieve chamber 3. It leads to a certain congestion in the first part of the sieve chamber 3, so that the rejects only gradually pass into the downstream part of the sieve chamber 3.
  • the dilution water supplied ensures that as many fibers as possible are still washed out and recovered.
  • the diaphragm 11 is accommodated in a diaphragm housing 13 and can also be designed as an adjustable iris diaphragm. This makes it possible to adapt the flow conditions when passing from the first sieve chamber 1 to the second sieve chamber 3, even during operation. This is of particular importance when very different types of substance, e.g. different types of waste paper can be used.
  • a retaining ring 34 on the end of the sieve space 3 ⁇ adjacent to the reject material discharge 31 prevents the suspension from passing through this sieve space too quickly. This leaves enough time for the suspension located here, which is heavily contaminated with impurities, to be dewatered, so that the rejects with a high consistency of e.g. 15, 20 or more% can come out of the rejects outlet 31.
  • the first zone A relates to a pure sorting part with the rotor 5 or 5 ⁇ (the same or similar parts are identified in the current figures with the same reference numerals, but with dashes), followed by a washing zone B, 1 corresponds to the screen space 3, which is separated by damming rings 7 and 7 ⁇ from a third zone C, which acts as a drainage zone.
  • the inner diameter d 1 of the diaphragm 11 is 8 or 8 ⁇ and 9 or 9 ⁇ the same diameter in relation to the diameter of the sieves provided _ d 1 / D is 0.3 to 0.7.
  • the inner diameter of the retaining rings 7 and 7 ⁇ and 34 d2 and d3 to the sieve diameter are d2 / D equal to d3 / D equal to 0.4 to 0.8.
  • the angle of inclination y of the retaining rings 7, 7 ⁇ and 34 against the rotor axis is at least 75 °, preferably between 80 and 83 °.
  • the speed of the rotor blades or elements radially outside is between 10 and 25 m / s.
  • the sorting apparatus is to be used for the final stage sorting (so-called reject sorting) and therefore requires relatively fine sieve openings.
  • hole diameters of sieve 8 or 8 ⁇ between 0.8 and 2.6 mm would be possible, for relatively very fine sorting tasks, perforations in the form of slots between 0.15 and 0.8 mm would be possible.
  • the slot widths for the screen basket 9 or 9 ⁇ of the second screen area would be between 0.15 and 0.5 mm.
  • hole diameter or the choice of holes or slots naturally depends on the waste paper to be sorted, its degree of soiling and the type of soiling. It can be said that the hole widths for relatively fine sorting tasks in the form of round holes can have diameters between 0.6 and 1.4 mm.
  • the pressure build-up in the first sorting part 40, 40 ⁇ enables high throughput due to the orifice and the pressure build-up enables the use of sieves with the finest perforations, as stated in the text.
  • the dilution water can preferably be added by means of lines 26 connected obliquely, for example in the tangential direction, to the strainer basket 9 or 9 'in the region of the washing zone B. Additional measures can be taken here to prevent the dilution water from escaping from the screen area there too quickly.
  • This can e.g. an unperforated area 25 of the strainer basket 9 or 9 ⁇ serving as a locking plate (see FIG. 2). This is also shown in cross section B-B of FIG. 2.
  • the rotor elements which are used to circulate the suspension in the screen space 1 or 1 ⁇ of the first sorting unit 40 or 40onia, can be hydrofoils 16, but also projections 23 with a sharp edge at the front in the direction of rotation with a radial abutting surface, as in FIGS 3 shown. In this case, these rotor elements are continuous strips which extend over the length of the rotor part. However, they can also be divided several times and then be distributed approximately evenly over the outer surface of the rotor drum as shorter elements.
  • this washing zone B which is formed by the first zone of the second sorting unit 50 ⁇ adjacent to the screen space of the first sorting unit 40 ⁇ , one outside of the screen 9 ⁇ on all sides delimited acceptable substance space 14 ⁇ create, as shown in Fig. 3A. It is formed by a circumferential, cylindrical sheet 41 and two ring walls 44 and 45 on each end face. A line 42 leads out of this accepted substance space, the cross section of which can be controlled by the valve 43. This makes it possible in a special way that the washing water also fulfills its function and thus separates as many fibers as possible from the soiling, which are then sorted out by the sieve 9 ⁇ .
  • hydrofoils ie rotor blades provided with an airfoil profile
  • the rotor elements 28 are fastened to the helical surfaces provided on both front ends of the rotor part 5 ⁇ , which are formed by feed screws 36 of a single design.
  • the first rotor part 5 ′′′ carries rotor blades in the form of inclined ribs. Due to the inclined position, the suspension is also transported faster from one axial end to the other of the rotor 5 ′′′.
  • the rotor parts 5 ⁇ and 5 ′′′ of Figures 4 and 5 have as the base body open support drums which are held on one end face by means of support flanges 38 on the rotor shaft 27 ⁇ . These support flanges have holes 39 through which the introduced suspension initially flows in the axial direction near the rotor shaft through the rotor drum to the other axial end of the rotor drum, where it then reverses and arrives at the sorting elements 28 and 24, respectively, through the sieve 8 ⁇ to be sorted. There at the screw conveyors 36 are set up so that they support the flow of the suspension towards the sorting elements 24 and 28, depending on the direction of rotation. In this way, recirculation of the suspension occurs.
  • the recirculation of the impurities retained on the sieve results in a concentrated detection of the specifically light impurities and impurities in the center of the rotor drum 5 ⁇ and a lower long fiber concentration in the overflow portion, ie more long fibers are sorted out through the sieve 8 zunot and fed to the accepted substance. This facilitates both the subsequent washing and dewatering process and, of course, the fiber loss is also reduced.
  • rotor elements in the form of simple ribs or plates are preferably used, in FIGS. 1 to 5 with 15 and 17 respectively. Their radial dimension is between 25% and 45% of the respective inner diameter of the sieve in question.
  • these plates 22 are arranged somewhat obliquely to the generatrix of the outer surface of this rotor part. They are distributed approximately in a helical pattern over the outer surface.
  • Fig. 8 it is shown that the second screen basket 9 ⁇ of the second sorting unit 50 ⁇ can be tapered to the outlet end in the overflow 31.
  • the taper is approximately between 3 and 6 °, as shown.
  • the incline could of course be much stronger.
  • the radially outer edge of the sorting wing 17 ⁇ adapts to this conical sieve shape. This could improve the dewatering of debris (rejects).
  • the screen basket 9 ′′′ of the second sorting unit 50 ′′′ is cylindrical, but a central central axis is inclined obliquely upwards towards the rotor central axis towards the overflow end 31.
  • this inclination could also be chosen to be between 3 and 6 °.
  • the radially outer edge of the rotor blades 17 ′′′ must adapt to this inclination according to FIG. 8.
  • the variant according to FIG. 10 has an annular sieve space 305 in the first part, which is formed between a rotationally symmetrical sieve basket 308 and a drum-like rotor part 300, which carries the sorting elements 16.
  • the diameter of the first sieve 308 is significantly larger than that of the second sieve 311, the difference is therefore more than 20%, preferably more than 50%.
  • Suspensions with a relatively low dirt content, but for high throughputs, can be used here.
  • the suspension is fed in via line 74, while the cleaned fiber suspension is withdrawn from the accepting material chamber 304 via line 75.
  • Dilution water in the second sieve chamber 312 can also be fed in via the line 66 and perforations in the upper, drum-shaped rotor part, and also through the hollow part of the shaft 318 in the transition region between the first and second sieve chambers.
  • a baffle plate 324 is also attached to the rotor shaft 318.
  • the removal of the cleaned fiber suspension behind the second sieve 311 takes place through line 78.
  • the rejects are out occurs the second sieve space 312 on the drum part of the rotor, a plurality of ejection vanes 61 are provided with preferably radial extension in order to better convey the rejects into the discharge channel 60.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Centrifugal Separators (AREA)
  • Filtration Of Liquid (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Removal Of Specific Substances (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

The sorting apparatus consists of two sorting units 40 and 50 connected in series, where at least the first sorting unit 40 is maintained at a pressure above that of the atmosphere and the screen spaces 1 and 3 lie within the cylindrical screens 8 and 9 and are directly connected in series, but with an interposed baffle 11 which influences and determines the transition between the two screen spaces in terms of flow behaviour. Preferably, at least the element 3', adjacent to the rejected material discharge 31, of the screen space of the second sorting unit 50 as well as the associated element of the accepted stock space is freely connected to the atmosphere. Preferably, this element forms the dewatering zone while the other, that element of the second sorting unit adjacent to the first sorting unit 40, forms a wash zone in which the fibres are already separated to a large extent from the rejected material. <IMAGE>

Description

Die Erfindung betrifft einen Sortierapparat entsprechend dem Oberbegriff des Patentanspruchs 1. Ein solcher Apparat ist be­kanntgeworden aus GB 372 760. Dabei wird die Fasersuspension drucklos durch drei konstruktiv und funktionell hintereinander­geschaltete Sortiereinheiten hindurchgesetzt. Die hierbei zwi­schen zwei einander benachbarten Sortiereinheiten vorgesehene Blende stellt eine gewisse Sperrung für den Durchfluß der Suspen­sion von einem Siebraum in den nachgeschalteten dar, indem diese Blende eine Drosselwirkung ausübt. Eine feinfühlige Einflußnahme auf das Geschehen in den beiden einander benachbarten Sortierein­heiten ist hierdurch nicht möglich.The invention relates to a sorting apparatus according to the preamble of patent claim 1. Such an apparatus has become known from GB 372 760. The fiber suspension is passed through three structurally and functionally connected sorting units without pressure. The orifice provided here between two adjacent sorting units represents a certain block for the flow of the suspension from a sieve space into the downstream one, in that this orifice exerts a throttling effect. A sensitive influence on the events in the two adjacent sorting units is not possible.

US-PS 3 898 157 offenbart eine Vorrichtung, bei der ebenfalls zwei Sortiereinheiten vorgesehen sind. Die gesamte Einrichtung steht dabei unter Druck. Bei dieser Einrichtung sind keinerlei Vorkehrungen dafür getroffen, Stoffsuspensionen bei unterschied­lichen Produktionsmengen und unterschiedlichen Störstoffgehalten einwandfrei zu verarbeiten.US Pat. No. 3,898,157 discloses an apparatus in which two sorting units are also provided. The entire facility is under pressure. With this facility, no precautions have been taken to properly process material suspensions with different production quantities and different levels of contaminants.

Die in der letzten Stufe einer Sortierung (z.B. Sortierung von Altpapier) eingesetzte Maschine hat die Aufgabe, den Störstoff (Spuckstoff) vom brauchbaren Fasermaterial zu trennen. Der Trenn­vorgang muß so erfolgen, daß einerseits der Faserverlust mög­lichst gering ist, andererseits jedoch ein möglichst hoher Stör­stoff-Abscheidewirkungsgrad erreicht wird. Bekanntlich bestimmt ja die letzte Sortierstufe den Wirkungsgrad der gesamten Sor­tierung.The machine used in the last stage of sorting (eg sorting waste paper) has the task of separating the contaminant (rejects) from the usable fiber material. The separation process must be carried out in such a way that on the one hand the fiber loss is as small as possible, but on the other hand the highest possible efficiency of the removal of impurities is achieved. As is well known, the last sorting level determines the efficiency of the entire sorting.

Bekannte Endstufensortierer sind z.B. Vibrationssortierer. Diese Maschinen erfordern bei den notwendigen Sieblochungen relativ große Siebflächen und hohe Stoffverdünnungen, um überhaupt einen einigermaßen zufriedenstellenden Sortiereffekt zu erreichen. Dazu sind die Siebe sehr verstopfungsanfällig.Known power stage sorters are e.g. Vibration sorter. These machines require relatively large screen areas and high material dilutions for the necessary screen perforations in order to achieve a reasonably satisfactory sorting effect. The sieves are very susceptible to clogging.

In den letzten Jahren wurden daher Endstufensortierer entwickelt, die diese Vibrationssortierer ersetzen sollen, bei gleichzeitig möglichst hohem Auswurftrockengehalt, wie z.B. in DE-A 30 06 482 beschrieben. Von Nachteil bei dieser Maschine ist der nur auf mittlere Reinheitsansprüche beschränkte Einsatz und der für reine Sortieraufgaben relativ hohe Energiebedarf.Power stage sorters have been developed in recent years to replace these vibration sorters with the highest possible ejection dry content, e.g. described in DE-A 30 06 482. Disadvantages of this machine are its use, which is limited to medium cleanliness requirements, and the relatively high energy requirement for pure sorting tasks.

Ein weiterer neuer Endstufensortierer ist der Rejektsortierer gemäß DE-A 32 38 742. Es handelt sich bei dieser Maschine eben­falls um einen reinen Sortierer. Bei sehr engen Löchern der Sor­tiersiebe ist der Stoffverlust oft beträchtlich.Another new final stage sorter is the reject sorter according to DE-A 32 38 742. This machine is also a pure sorter. With very narrow holes in the sorting screens, the loss of material is often considerable.

Der Erfindung liegt die Aufgabe zugrunde, eine Sortiereinrichtung gemäß dem Oberbegriff des Hauptanspruches zu schaffen, die auch bei feinsten Siebperforierungen eine leichte Anpassung an unter­schiedliche Produktionsmengen und an unterschiedliche Störstoff­gehalte möglich macht, und die dabei die Faserverluste bei konti­nuierlicher Betriebsweise der Einrichtung klein hält.The invention has for its object to provide a sorting device according to the preamble of the main claim, which makes it easy to adapt to different production quantities and different levels of impurities even with the finest screen perforations, and which keeps the fiber losses during continuous operation of the device small.

Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst.This object is achieved by the characterizing features of claim 1.

Durch den Überdruck im Siebraum der ersten Sortiereinheit kann mit relativ feiner Perforierung des dortigen Siebes und hohem Durchsatz bei gutem Sortierwirkungsgrad gearbeitet werden.Due to the overpressure in the screen space of the first sorting unit, it is possible to work with relatively fine perforation of the screen there and high throughput with good sorting efficiency.

Es ergibt sich eine einfache Konstruktion mit guter Variations­möglichkeit, z.B. auch durch die Anpassung der Blende.The result is a simple construction with good variation possibilities, for example also by adjusting the aperture.

Nachfolgend wird die Erfindung anhand Axial- und Querschnitten der in den Figuren dargestellter Ausführungsbeispiele erläutert.The invention is explained below with reference to axial and cross sections of the exemplary embodiments shown in the figures.

Einander entsprechende Teile sind dabei in den verschiedenen Fi­guren mit dem gleichen Bezugszeichen, jedoch mit einem oder meh­reren Beistrichen versehen, gekennzeichnet.Corresponding parts are identified in the various figures with the same reference numerals, but with one or more commas.

Der Sortierapparat besteht aus zwei konstruktiv und funktionell hintereinandergeschalteten Sortiereinheiten 40 und 50. Die erste Sortiereinheit 40 weist ein zylindrisches Sieb 8 auf, das einen ringförmigen Siebraum 1 umschließt, der zwischen dem Sieb 8 und einem trommelartigen Rotorteil 5 gebildet ist, das der ersten Sortiereinheit 40 zugeordnet ist. Der Einlaß 19 für die Suspen­sion befindet sich am der zweiten Sortiereinheit 50 abgewandten Ende der ersten Sortiereinheit 40, und ein Auslaß aus dem das Sieb 8 umgebenden Gutstoffraum 2 ist mit 18 bezeichnet. In diesem Falle weist der Rotor Sortierelemente 16 in Form von Flügeln oder Foils auf, die eine gute Sortierwirkung hervorrufen. Der Antrieb des Rotors erfolgt über die Welle 27 und ist hier nicht darge­stellt. Bei einem im wesentlichen gleichen Aufbau zeigt die zwei­te Sortiereinheit 50, bestehend aus äußerem Gutstoffraum 4, inne­rem, ringförmigem Siebraum 3 bzw. 3ʹ, zylindrischem Sieb 9 und Rotorteil 6 mit den Sortierelementen 17. Diese sind hier jedoch einfach als radiale Rippen ausgebildet. Der Siebraum ist hier drucklos und steht über sein Ende 3ʹ über Auslaß 31 frei mit der Atmosphäre in Verbindung. Das gleiche gilt für den Gutstoffraum 4, der über den Auslaß 21 frei mit der Atmosphäre in Verbindung steht. Zwischen den Siebräumen 1 und 3 ist eine Blende 11 zwi­schengeschaltet, die an dem Rotor einen Spalt 12 freiläßt und so­mit strömungsmäßig den Übergang zwischen den beiden Siebräumen beeinflußt. Hierdurch wird auch der Überdruck gegenüber der umge­benden Atmosphäre im Siebraum 1 aufrechterhalten. Der den Sieb­raum 1 bzw. Sieb 8 umgebende Gutstoffraum 2 ist durch ein Auslaß­ventil 30 am Auslaßstutzen 18 gegen die Atmosphäre abgeschottet und wird somit unter Überdruck stehend gehalten. Der Überdruck liegt vorzugsweise zwischen 0,4 und 1,6 bar.The sorting apparatus consists of two structurally and functionally connected sorting units 40 and 50. The first sorting unit 40 has a cylindrical sieve 8, which encloses an annular sieve space 1, which is formed between the sieve 8 and a drum-like rotor part 5, which is the first sorting unit 40 assigned. The inlet 19 for the suspension is located at the end of the first sorting unit 40 facing away from the second sorting unit 50, and an outlet from the accepting material space 2 surrounding the sieve 8 is designated by 18. In this case, the rotor has sorting elements 16 in the form of wings or foils, which produce a good sorting effect. The rotor is driven via shaft 27 and is not shown here. With essentially the same structure, the second sorting unit 50, consisting of the outer accept material space 4, the inner, annular sieve space 3 or 3ʹ, the cylindrical sieve 9 and the rotor part 6 with the sorting elements 17, are shown here, however, simply as radial ribs. The screen space is depressurized here and is freely connected to the atmosphere via its end 3ʹ via outlet 31. The same applies to the accept material space 4, which is freely connected to the atmosphere via the outlet 21. A screen 11 is interposed between the screen spaces 1 and 3, which leaves a gap 12 on the rotor and thus influences the flow between the two screen spaces in terms of flow. This also maintains the excess pressure in relation to the surrounding atmosphere in the screen space 1. The accepting material space 2 surrounding the sieve space 1 or sieve 8 is sealed off from the atmosphere by an outlet valve 30 on the outlet connection 18 and is thus kept under excess pressure. The excess pressure is preferably between 0.4 and 1.6 bar.

Der Sortierapparat könnte entgegen der Darstellung mit horizonta­ler Rotorachse auch mit vertikaler Rotorachse angeordnet sein. Im dargestellten Falle ist wegen der Horizontalanordnung noch eine als Blende wirkende, schräg angeordnete Ringscheibe 7 im zweiten Siebraum 3 vorgesehen. Sie führt zu einem gewissen Stau im ersten Teil des Siebraumes 3, so daß nur allmählich der Spuckstoff in den nachgeschalteten Teil des Siebraumes 3 übertritt. Durch das zugeführte Verdünnungswasser wird hierdurch gewährleistet, daß möglichst viele Fasern noch ausgewaschen und wiedergewonnen werden.Contrary to the representation with a horizontal rotor axis, the sorting apparatus could also be arranged with a vertical rotor axis. In the case shown, because of the horizontal arrangement, an obliquely arranged annular disk 7, which acts as a diaphragm, is also provided in the second sieve chamber 3. It leads to a certain congestion in the first part of the sieve chamber 3, so that the rejects only gradually pass into the downstream part of the sieve chamber 3. The dilution water supplied ensures that as many fibers as possible are still washed out and recovered.

Die Blende 11 ist in einem Blendengehäuse 13 untergebracht und kann auch als verstellbare Irisblende ausgebildet sein. Hierdurch ist eine Anpassung der Strömungsverhältnisse beim Übertritt vom ersten Siebraum 1 zum zweiten Siebraum 3 auch während des Betrie­bes möglich. Dies hat seine besondere Bedeutung, wenn stark un­terschiedliche Stoffarten, z.B. verschiedene Altpapiersorten, verwendet werden.The diaphragm 11 is accommodated in a diaphragm housing 13 and can also be designed as an adjustable iris diaphragm. This makes it possible to adapt the flow conditions when passing from the first sieve chamber 1 to the second sieve chamber 3, even during operation. This is of particular importance when very different types of substance, e.g. different types of waste paper can be used.

Durch einen Stauring 34 am dem Spuckstoffabzug 31 benachbarten Ende des Siebraumes 3ʹ wird ein zu schnelles Hindurchtreten der Suspension durch diesen Siebraum verhindert. Hierdurch bleibt genügend Zeit, daß die hier befindliche, stark mit Verunreinigun­gen durchsetzte Suspension entwässert wird, so daß der Spuckstoff mit hoher Konsistenz von z.B. 15, 20 oder mehr % aus dem Spuck­stoffauslaß 31 abgehen kann.A retaining ring 34 on the end of the sieve space 3ʹ adjacent to the reject material discharge 31 prevents the suspension from passing through this sieve space too quickly. This leaves enough time for the suspension located here, which is heavily contaminated with impurities, to be dewatered, so that the rejects with a high consistency of e.g. 15, 20 or more% can come out of the rejects outlet 31.

Es ergeben sich auf diese Weise praktisch drei Zonen, wie in Fi­gur 2 mit den Großbuchstaben A, B und C angedeutet. Dabei be­trifft die erste Zone A einen reinen Sortierteil mit dem Rotor 5 bzw. 5ʹ (gleiche bzw. ähnlich wirkende Teile werden in den lau­fenden Figuren jeweils mit den gleichen Bezugszeichen, jedoch mit Beistrichen versehen, gekennzeichnet), daran schließt sich eine Waschzone B an, die in Fig. 1 dem Siebraum 3 entspricht, die ge­trennt ist durch Stauring 7 bzw. 7ʹ von einer dritten Zone C, die als Entwässerungszone wirkt.This results in practically three zones, as indicated in FIG. 2 with the capital letters A, B and C. The first zone A relates to a pure sorting part with the rotor 5 or 5ʹ (the same or similar parts are identified in the current figures with the same reference numerals, but with dashes), followed by a washing zone B, 1 corresponds to the screen space 3, which is separated by damming rings 7 and 7ʹ from a third zone C, which acts as a drainage zone.

Dabei werden folgende Durchmesserverhältnisse bevorzugt: Innen­durchmesser d₁ der Blende 11 beträgt im Verhältnis zum Durch­messer der Siebe 8 bzw. 8ʹ und 9 bzw. 9ʹ _ gleiche Durchmesser vorausgesetzt _ d₁/D gleich 0,3 bis 0,7. Die Innendurchmesser der Stauringe 7 bzw. 7ʹ und 34 d₂ bzw. d₃ zum Siebdurchmesser betragen d₂/D gleich d₃/D gleich 0,4 bis 0,8. Der Neigungswinkel y der Stauringe 7, 7ʹ und 34 gegen die Rotorachse beträgt mindestens 75°, vorzugsweise zwischen 80 und 83°.The following diameter ratios are preferred: The inner diameter d 1 of the diaphragm 11 is 8 or 8 ʹ and 9 or 9 ʹ the same diameter in relation to the diameter of the sieves provided _ d 1 / D is 0.3 to 0.7. The inner diameter of the retaining rings 7 and 7ʹ and 34 d₂ and d₃ to the sieve diameter are d₂ / D equal to d₃ / D equal to 0.4 to 0.8. The angle of inclination y of the retaining rings 7, 7ʹ and 34 against the rotor axis is at least 75 °, preferably between 80 and 83 °.

Die Geschwindigkeit der Rotorflügel oder -elemente radial außen beträgt zwischen 10 und 25 m/s.The speed of the rotor blades or elements radially outside is between 10 and 25 m / s.

Der Sortierapparat soll für die Endstufensortierung (sogenannte Reject-Sortierung) verwendet werden, und erfordert daher relativ feine Sieböffnungen. Für mittelfeine Sortierung kämen Lochdurch­messer des Siebes 8 bzw. 8ʹ zwischen 0,8 und 2,6 mm Durchmesser in Frage, für relativ sehr feine Sortieraufgaben Lochungen in Form von Schlitzen zwischen 0,15 und 0,8 mm. Für den Siebkorb 9 bzw. 9ʹ des zweiten Siebraumes würden in diesem Fall die Schlitz­weiten zwischen 0,15 und 0,5 mm betragen.The sorting apparatus is to be used for the final stage sorting (so-called reject sorting) and therefore requires relatively fine sieve openings. For medium-fine sorting, hole diameters of sieve 8 or 8ʹ between 0.8 and 2.6 mm would be possible, for relatively very fine sorting tasks, perforations in the form of slots between 0.15 and 0.8 mm would be possible. In this case, the slot widths for the screen basket 9 or 9ʹ of the second screen area would be between 0.15 and 0.5 mm.

Die Wahl der Lochdurchmesser bzw. die Wahl von Löchern oder Schlitzen hängt natürlich von dem zu sortierenden Altpapier, bzw. dessen Verschmutzungsgrad und Art der Verschmutzungen ab. Man kann sagen, daß die Lochweiten für relativ feine Sortieraufgaben in Form von runden Löchern Durchmesser zwischen 0,6 und 1,4 mm aufweisen können.The choice of hole diameter or the choice of holes or slots naturally depends on the waste paper to be sorted, its degree of soiling and the type of soiling. It can be said that the hole widths for relatively fine sorting tasks in the form of round holes can have diameters between 0.6 and 1.4 mm.

Es ist durch entsprechende Wahl des Blendenquerschnitts (12 siehe Fig. 1) der Blende 11 einerseits und des Auslaufsdrucks (Gegen­druck) aus dem ersten Gutstoffraum 2 (siehe Ventil oder Schieber 30 am Stutzen 18 der Fig. 1) eine leichte Anpassung an unter­schiedliche Produktionsmengen und Störstoffgehalte möglich. So kann z.B. bei kleiner Durchsatzmenge der Gegendruck im Auslauf (18) erhöht oder der Blendendurchsatzquerschnitt vergrößert wer­den, um genügenden Schmutzabzug über den zweiten Sortierteil 50, 50ʹ zu erreichen.It is by appropriate choice of the orifice cross-section (12 see Fig. 1) of the orifice 11 on the one hand and the outlet pressure (back pressure) from the first accept chamber 2 (see valve or slide 30 on the nozzle 18 of Fig. 1) a slight adjustment to different production quantities and Impurity levels possible. For example, with a small throughput, the back pressure in the outlet (18) increased or the diaphragm throughput cross section increased to achieve sufficient dirt removal via the second sorting part 50, 50,.

Grundsätzlich bewirkt der durch die Blende mögliche Druckaufbau im ersten Sortierteil 40, 40ʹ hohen Durchsatz und der Druckaufbau ermöglicht den Einsatz von Sieben mit feinsten Perforationen, wie im Text angegeben.Basically, the pressure build-up in the first sorting part 40, 40ʹ enables high throughput due to the orifice and the pressure build-up enables the use of sieves with the finest perforations, as stated in the text.

Die Zugabe von Verdünnungswasser kann vorzugsweise mittels schräg, etwa in tangentialer Richtung an den Siebkorb 9 bzw. 9ʹ im Bereich der Waschzone B angeschlossenen Leitungen 26 erfolgen. Man kann hier zusätzliche Maßnahmen treffen, um zu verhindern, daß das Verdünnungswasser zu schnell aus dem dortigen Siebraum heraustritt. Dies kann z.B. ein als Sperrblech dienender, unge­lochter Bereich 25 des Siebkorbes 9 bzw. 9ʹ sein (siehe Figur 2). Dies ist auch noch im querschnitt B-B der Fig. 2 dargestellt.The dilution water can preferably be added by means of lines 26 connected obliquely, for example in the tangential direction, to the strainer basket 9 or 9 'in the region of the washing zone B. Additional measures can be taken here to prevent the dilution water from escaping from the screen area there too quickly. This can e.g. an unperforated area 25 of the strainer basket 9 or 9ʹ serving as a locking plate (see FIG. 2). This is also shown in cross section B-B of FIG. 2.

Man kann auch entsprechend Fig. 3 ein zusätzliches Staublech 14 in Form eines Troges unterhalb des Siebes 9 bzw. 9ʹ in diesem Bereich B anbringen. Dadurch entsteht ein Stauraum 14ʹ in diesem Bereich unterhalb des Siebkorbes 9 bzw. 9ʹ, der ein zu schnelles Austreten der Verdünnungsflüssigkeit aus dem dortigen Siebraum verhindert, da die auf dem Blech 14 aufgestaute Flüssigkeit einen Gegenstau zu der Suspension im Siebraum bildet. Die Rotorelemen­te, die zur Umwälzung der Suspension im Siebraum 1 bzw. 1ʹ der ersten Sortiereinheit 40 bzw. 40ʹ dienen, können Hydrofoils 16, aber auch Vorsprünge 23 mit in Drehrichtung vorn liegender, scharfer Kante mit radial liegender Stoßfläche sein, wie in Figur 2 und 3 dargestellt. In diesem Fall sind diese Rotorelemente durchgehende, sich über die Länge des Rotorteils erstreckende Leisten. Sie können aber auch mehrfach unterteilt sein und dann als kürzere Elemente etwa gleichmäßig über die Mantelfläche der Rotortrommel verteilt sein.3, an additional baffle plate 14 in the form of a trough below the screen 9 or 9 'can be attached in this area B. This creates a storage space 14ʹ in this area below the strainer 9 or 9ʹ, which prevents the dilution liquid from escaping from the sieve space there too quickly, since the liquid accumulated on the sheet 14 forms a backlog of the suspension in the sieve space. The rotor elements, which are used to circulate the suspension in the screen space 1 or 1ʹ of the first sorting unit 40 or 40 können, can be hydrofoils 16, but also projections 23 with a sharp edge at the front in the direction of rotation with a radial abutting surface, as in FIGS 3 shown. In this case, these rotor elements are continuous strips which extend over the length of the rotor part. However, they can also be divided several times and then be distributed approximately evenly over the outer surface of the rotor drum as shorter elements.

Um die Sortierleistung zu erhöhen und den Auswaschvorgang in der Waschzone B zu verbessern, kann man auch in dieser Waschzone B, die also von der dem Siebraum des ersten Sortiereinheit 40ʹ be­nachbarten, ersten Zone des zweiten Sortiereinheit 50ʹ gebildet wird, einen außerhalb des Siebes 9ʹ allseitig abgegrenzten Gut­stoffraum 14ʺ schaffen, wie in Fig. 3A dargestellt. Er ist gebil­det durch ein umlaufendes, zylinderförmiges Blech 41 und zwei Ringwände 44 und 45 an jeder Stirnseite. Eine Leitung 42 führt aus diesem Gutstoffraum heraus, dessen Durchtrittsquerschnitt durch das Ventil 43 steuerbar ist. Hierdurch wird in besonderer Weise ermöglicht, daß das Waschwasser seine Funktion auch erfüllt und somit von den Verschmutzungen möglichst viele Fasern trennt, die dann durch das Sieb 9ʹ aussortiert werden.In order to increase the sorting performance and to improve the washing-out process in the washing zone B, one can also use this washing zone B, which is formed by the first zone of the second sorting unit 50ʹ adjacent to the screen space of the first sorting unit 40ʹ, one outside of the screen 9ʹ on all sides delimited acceptable substance space 14ʺ create, as shown in Fig. 3A. It is formed by a circumferential, cylindrical sheet 41 and two ring walls 44 and 45 on each end face. A line 42 leads out of this accepted substance space, the cross section of which can be controlled by the valve 43. This makes it possible in a special way that the washing water also fulfills its function and thus separates as many fibers as possible from the soiling, which are then sorted out by the sieve 9ʹ.

Im Fall von Fig. 4 sind bezüglich des ersten Rotorteils sogenann­te Hydrofoils, also mit Tragflügelprofil versehene Rotorflügel vorgesehen, die etwa die gleiche Länge wie der Rotorteil haben. In diesem Fall sind die Rotorelemente 28 an an beiden stirnseiti­gen Enden des Rotorteils 5ʺ vorgesehenen Wendelflächen befestigt, die von hier eingängig ausgebildeten Förderschnecken 36 gebildet werden.In the case of FIG. 4, with respect to the first rotor part, so-called hydrofoils, ie rotor blades provided with an airfoil profile, are provided which have approximately the same length as the rotor part. In this case, the rotor elements 28 are fastened to the helical surfaces provided on both front ends of the rotor part 5ʺ, which are formed by feed screws 36 of a single design.

Im Fall der Fig. 5 trägt das erste Rotorteil 5‴ Rotorflügel in Form von schräggestellten Rippen. Durch die Schrägstellung er­folgt auch ein schnellerer Transport der Suspension vom einen zum anderen axialen Ende des Rotors 5‴.In the case of FIG. 5, the first rotor part 5 ‴ carries rotor blades in the form of inclined ribs. Due to the inclined position, the suspension is also transported faster from one axial end to the other of the rotor 5 ‴.

Die Rotorteile 5ʺ und 5‴ der Figuren 4 bzw. 5 weisen als Grund­körper offene Tragtrommeln auf, die an einer Stirnseite mittels Tragflanschen 38 auf der Rotorwelle 27ʹ gehalten sind. Diese Tragflansche weisen Bohrungen 39 auf, durch welche die eingelei­tete Suspension zunächst in axialer Richtung in Nähe der Rotor­welle durch die Rotortrommel zum anderen axialen Ende der Rotor­trommel strömt, wo sie dann umkehrt und zu den Sortierelementen 28 bzw. 24 gelangt, um durch das Sieb 8ʹ sortiert zu werden. Da­ bei sind die Förderschnecken 36 so eingerichtet, daß entsprechend der Drehrichtung sie die Strömung der Suspension zu den Sortier­elementen 24 bzw. 28 hin unterstützen. Es tritt auf diese Weise ein Rezirkulation der Suspension auf. Durch die Rezirkulation des am Sieb zurückgehaltenen Störstoffes wird eine konzentrierte Er­fassung der spezifisch leichten Störstoffe und Verunreinigungen im Zentrum der Rotortrommel 5ʺ und eine geringere Langfaserkon­zentration im Überlaufanteil erreicht, d.h. es werden mehr Lang­fasern durch das Sieb 8ʹ hindurch aussortiert und dem Gutstoff zugeführt. Damit wird sowohl der nachfolgende Auswasch- als auch Entwässerungsvorgang erleichtert und natürlich der Faserverlust auch reduziert.The rotor parts 5ʺ and 5 ‴ of Figures 4 and 5 have as the base body open support drums which are held on one end face by means of support flanges 38 on the rotor shaft 27ʹ. These support flanges have holes 39 through which the introduced suspension initially flows in the axial direction near the rotor shaft through the rotor drum to the other axial end of the rotor drum, where it then reverses and arrives at the sorting elements 28 and 24, respectively, through the sieve 8ʹ to be sorted. There at the screw conveyors 36 are set up so that they support the flow of the suspension towards the sorting elements 24 and 28, depending on the direction of rotation. In this way, recirculation of the suspension occurs. The recirculation of the impurities retained on the sieve results in a concentrated detection of the specifically light impurities and impurities in the center of the rotor drum 5ʺ and a lower long fiber concentration in the overflow portion, ie more long fibers are sorted out through the sieve 8 zugeführt and fed to the accepted substance. This facilitates both the subsequent washing and dewatering process and, of course, the fiber loss is also reduced.

Es werden in bezug auf den zweiten Sortierteil 50, also für die Waschzone B und Entwässerungszone C, vorzugsweise Rotorelemente in Form von einfachen Rippen oder Platten verwendet, in den Figu­ren 1 bis 5 mit 15 bzw. 17 bezeichnet. Deren radiale Dimension beträgt zwischen 25% und 45% des jeweils vorhandenen Innendurch­messers des betreffenden Siebes. Im Falle von Fig. 6 sind diese Platten 22 etwas schräg zur Erzeugenden der Mantelfläche dieses Rotorteils angeordnet. Sie sind etwa schraubenlinienförmig über die Mantelfläche verteilt. In diesem Fall liegt eine Verti­kalaufstellung des Sortierapparats vor; in diesem Fall braucht man keinen Stauring, um am zweiten Rotorteil 5‴ eine untere Wasch- und eine obere Entwässerungszone zu bilden, da selbstver­ständlich aufgrund der Schwerkraft hier das Waschwasser im unte­ren Bereich verbleibt. Im Fall von Fig. 7 hat man auch keinen Stauring, sondern es ist hier die Rotorachse um einen kleinen Winkel z, der zwischen 15 und 45° betragen kann, gegen die Ho­rizontale geneigt, so daß sich der erste Rotorteil 5ʹ relativ mehr unten befindet. Hierbei wird mittels eines Wehres 29, das auch verstellbar ausgebildet sein kann, die Entwässerungszone C von der Waschzone B getrennt. Hier wird auch kein Austrittsstau­ring nötig, sondern man kann auch hier im unteren Bereich der Entwässerungszone C ein Wehr 37 verwenden, das eine entsprechende Stauwirkung hervorruft.In relation to the second sorting part 50, that is to say for the washing zone B and dewatering zone C, rotor elements in the form of simple ribs or plates are preferably used, in FIGS. 1 to 5 with 15 and 17 respectively. Their radial dimension is between 25% and 45% of the respective inner diameter of the sieve in question. In the case of Fig. 6, these plates 22 are arranged somewhat obliquely to the generatrix of the outer surface of this rotor part. They are distributed approximately in a helical pattern over the outer surface. In this case there is a vertical installation of the sorting apparatus; in this case, there is no need for a retaining ring in order to form a lower washing and an upper dewatering zone on the second rotor part 5 ‴, since, of course, the washing water remains in the lower region here due to gravity. In the case of Fig. 7 there is no congestion ring, but here the rotor axis is inclined to the horizontal by a small angle z, which can be between 15 and 45 °, so that the first rotor part 5ʹ is relatively more below. The dewatering zone C is separated from the washing zone B by means of a weir 29, which can also be designed to be adjustable. There is also no need for a discharge ring here, but a weir 37 can also be used in the lower region of the drainage zone C, which causes a corresponding accumulation effect.

In Fig. 8 ist dargestellt, daß der zweite Siebkorb 9ʺ des zweiten Sortiereinheit 50ʺ bis zum Austrittsende im Überlauf 31 verjün­gend konisch ausgebildet sein kann. Die Konizität beträgt etwa zwischen 3 und 6°, wie dargestellt. Die Neigung könnte natür­lich auch noch erheblich stärker sein. In diesem Falle paßt sich die radial äußere Kante der Sortierflügel 17ʹ dieser konischen Siebform an. Hierdurch könnte die Entwässerung des Unrats (Spuck­stoff) verbessert werden.In Fig. 8 it is shown that the second screen basket 9ʺ of the second sorting unit 50ʺ can be tapered to the outlet end in the overflow 31. The taper is approximately between 3 and 6 °, as shown. The incline could of course be much stronger. In this case, the radially outer edge of the sorting wing 17ʹ adapts to this conical sieve shape. This could improve the dewatering of debris (rejects).

Im Fall von Fig. 9 ist der Siebkorb 9‴ des zweiten Sortierein­heit 50‴ zwar zylindrisch ausgebildet, jedoch ist eine zentrale Mittelachse gegen die Rotormittelachse zum Überlaufende 31 hin schräg nach oben geneigt. Diese Neigung könnte ebenfalls wie in Fig. 8 mit zwischen 3 und 6° gewählt werden. Auch in diesem Fall muß sich entsprechend Fig. 8 die radial äußere Kante der Rotorflügel 17‴ dieser Neigung anpassen.In the case of FIG. 9, the screen basket 9 ‴ of the second sorting unit 50 ‴ is cylindrical, but a central central axis is inclined obliquely upwards towards the rotor central axis towards the overflow end 31. As in FIG. 8, this inclination could also be chosen to be between 3 and 6 °. Also in this case, the radially outer edge of the rotor blades 17 ‴ must adapt to this inclination according to FIG. 8.

Die Variante gemäß Fig. 10 weist im ersten Teil einen ringförmi­gen Siebraum 305 auf, der zwischen einem rotationssymmetrischen Siebkorb 308 und einem trommelartigen Rotorteil 300, der die Sor­tierelemente 16ʹ trägt, gebildet ist. Hier ist der Durchmesser des ersten Siebes 308 wesentlich größer als der des zweiten Sie­bes 311, der Unterschied beträgt also mehr als 20%, vorzugsweise mehr als 50%. Hier kommen Suspensionen mit relativ geringerem Schmutzanteil, aber für hohe Durchsatzmengen in Frage. Die Zufüh­rung der Suspension erfolgt über Leitung 74, während der Abzug der gereinigten Fasersuspension aus dem Gutstoffraum 304 über Leitung 75 vorgenommen wird. Dabei kann ebenfalls Verdünnungswas­ser im zweiten Siebraum 312 über die Leitung 66 und Perforationen im oberen, trommelförmigen Rotorteil, ferner auch durch den im oberen Bereich hohlen Teil der Welle 318 im Übergangsbereich zwi­schen ersten und zweiten Siebraum zugeführt werden. Es ist noch eine Stauscheibe 324 an der Rotorwelle 318 angebracht. Der Abzug der gereinigten Fasersuspension hinter dem zweiten Sieb 311 er­folgt durch Leitung 78. Bei dieser Variante ist am Spuckstoffaus­ tritt des zweiten Siebraumes 312 am Trommelteil des Rotors eine Vielzahl von Auswurfflügeln 61 mit vorzugsweise radialer Er­streckung vorgesehen, um den Spuckstoff besser in den Abzugskanal 60 befördern zu können.The variant according to FIG. 10 has an annular sieve space 305 in the first part, which is formed between a rotationally symmetrical sieve basket 308 and a drum-like rotor part 300, which carries the sorting elements 16.. Here the diameter of the first sieve 308 is significantly larger than that of the second sieve 311, the difference is therefore more than 20%, preferably more than 50%. Suspensions with a relatively low dirt content, but for high throughputs, can be used here. The suspension is fed in via line 74, while the cleaned fiber suspension is withdrawn from the accepting material chamber 304 via line 75. Dilution water in the second sieve chamber 312 can also be fed in via the line 66 and perforations in the upper, drum-shaped rotor part, and also through the hollow part of the shaft 318 in the transition region between the first and second sieve chambers. A baffle plate 324 is also attached to the rotor shaft 318. The removal of the cleaned fiber suspension behind the second sieve 311 takes place through line 78. In this variant, the rejects are out occurs the second sieve space 312 on the drum part of the rotor, a plurality of ejection vanes 61 are provided with preferably radial extension in order to better convey the rejects into the discharge channel 60.

Claims (11)

1. Screening machine, especially for the screening of a fibre suspension heavily contaminated with rejects and other contraries, with two screening units (40, 50) following each other with respect to design and function, each of them provided with a rotor-associated rotation-symmetric screen (8, 8ʹ, 9, 9ʹ, 9ʺ, 9‴) enclosing a screening compartment (1, 3, 3ʹ), with screening elements (15, 16, 17ʹ, 17ʺ, 22) which are associated to the rotor (6) and arranged in the screening compartments (1, 3, 3ʹ) and with accepts compartments (2, 4) on the other side of the screen (8, 8ʹ, 9, 9ʹ, 9ʺ, 9‴) being radially arranged outside the screening compartment (1, 3), and with an orifice (11) between the two screening units (40, 50) which influences the flow passage between the two screen­ing compartments (1, 3), characterized by the fact, that the accepts compartment (2) of the first screening unit (40) is maintained under atmospheric excess pressure by a backpressure device (throttle valve 30) and that the accepts compartment (4) and the screening compartment (3) of the 2nd screening unit (50) are in connection with the atmosphere at least in their end sections.
2. Screening machine according to claim 1, characterized by the fact that the diameter difference of the screens (8, 9) is max. 10% of the larger screen diameter.
3. Screening machine according to one of the claims 1 or 2, with the characteristic that the orifice (11), e.g. iris diaphragm, can be regulated.
4. Screening machine according to one of the claims 1 to 3, characterized by an annular disk (7, 7ʹ) arranged in­clined to the rotor axle in the screening compartment (3) of the 2nd screening unit (50); this annular disk is form­ing a gap with the rotor (6) and subdivides the screening compartment (3) in two areas.
5. Screening machine according to one of the claims 1 to 4, characterized by the feature that the 2nd screening unit (50, 50ʹ, etc.) is subdivided into a washing zone (B) ad­jacent to the 1st screening unit and a dewatering zone (C).
6. Screening machine according to claim 5, characterized by the fact that for a subdivision a bottom damming plate (29) with somewhat inclined rotor axle and central axle of the screening units (40, 50, 40ʹ, 50ʹ, etc.) has been provided.
7. Screening machine according to one of the claims 1 to 6, characterized by a damming plate (14, 25) in the bottom range of the screen basket (9ʹ) in the washing zone (B).
8. Screening machine according to one of the claims 1 to 7, characterized by the fact that the first area of the accepts compartment (14ʺ) of the 2nd screening unit (50ʹ) adjacent to the 1st screening unit (40ʹ) is completely separated form the other areas of the accepts compartment of the 2nd screening unit (50ʹ) and is provided with its own outlet (42) with valve (43).
9. Screening machine according to one of the claims 1 to 8, characterized by the design that the screen basket (9ʺ) of the 2nd screening unit (50ʺ) is tapered towards the over­flow end (31).
10. Screening machine according to one of the claims 1 to 9, characterized by the fact that the axle of the screen basket (9‴) of the 2nd screening unit (50‴) has an in­clination between 5° and 10°
11. Screening machine according to one of the claims 1 or 3 to 10, characterized by the fact that for greater throughputs the diameter of the screen basket (308) of the first screening unit is larger by min. 50% than the diameter of the screen basket (311) of the 2nd screening unit.
EP88100660A 1987-02-07 1988-01-19 Screening apparatus Expired - Lifetime EP0278260B1 (en)

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AT88100660T ATE61429T1 (en) 1987-02-07 1988-01-19 REJECT SORTER.

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DE3703831 1987-02-07
DE19873703831 DE3703831A1 (en) 1987-02-07 1987-02-07 PLASTIC SORTER

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EP0278260A2 EP0278260A2 (en) 1988-08-17
EP0278260A3 EP0278260A3 (en) 1989-02-15
EP0278260B1 true EP0278260B1 (en) 1991-03-06

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JP (1) JPS63288290A (en)
KR (1) KR960004539B1 (en)
AT (1) ATE61429T1 (en)
BR (1) BR8800535A (en)
CA (1) CA1330207C (en)
DE (2) DE3703831A1 (en)
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Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE464640B (en) * 1988-06-16 1991-05-27 Kamyr Ab DEVICE FOR SILENCE OF A SUSPENSION OF A FIBER CELLULOSAMASSA
FI80735B (en) * 1988-08-04 1990-03-30 Tampella Oy Ab FOERFARANDE OCH ANORDNING FOER SORTERING OCH BEHANDLING AV MASSA.
SE464473B (en) * 1988-11-17 1991-04-29 Sunds Defibrator Ind Ab A screening device
US5172813A (en) * 1989-05-17 1992-12-22 A. Ahlstrom Corporation Method and an apparatus for treating fiber suspension
SE465038B (en) * 1989-11-22 1991-07-15 Kamyr Ab DEVICE FOR SEPARATION OF PARTICLES FROM A MASS STREAM AND FRACTIONATION OF THESE
US5119953A (en) * 1990-04-02 1992-06-09 Celleco Hedemora Ab Pulp suspension screening and fractionation apparatus
DE69212255T2 (en) * 1991-08-30 1997-02-06 Aikawa Iron Works Co Screening device for papermaking
US5433849A (en) * 1993-09-15 1995-07-18 Lyco Manufacturing, Inc. Double drum waste water screen
GB2319196B (en) * 1996-11-14 1998-11-04 Black Clawson Co Zoned pressure screen
US6155427A (en) * 1996-11-14 2000-12-05 Thermo Black Clawson Inc. Zoned pressure screen
SE509289C2 (en) 1997-04-14 1999-01-11 Sunds Defibrator Ind Ab Screening device with rejection throttle
SE9901148L (en) 1999-03-29 2000-06-12 Valmet Fibertech Ab Screening device with a rotatable and stationary screen means
SE514071C2 (en) 1999-04-08 2000-12-18 Valmet Fibertech Ab Screening device with axially displaceable cleavage ring
AT408771B (en) * 2000-02-03 2002-03-25 Andritz Ag Maschf SORTER FOR CLEANING A FIBER SUSPENSION
KR100485929B1 (en) * 2002-11-14 2005-04-29 한국염색기술연구소 Dust and Offensive Odor Removal System Using in Combination with Rotating Screen and Cyclone Scrubber
AR092114A1 (en) * 2012-08-13 2015-03-25 Lee Tech Llc MULTIPLE AREAS SCREENING DEVICE
US11103811B2 (en) 2016-11-04 2021-08-31 Icm, Inc. Mechanical separation devices
FI20175776A1 (en) 2017-08-31 2019-03-01 Andritz Oy Separator device
US12134049B2 (en) * 2018-06-10 2024-11-05 Icm, Inc. Mechanical separation device

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1092389A (en) * 1912-04-25 1914-04-07 Theodor Qviller Pulp-strainer.
US1209264A (en) * 1915-11-24 1916-12-19 Philip J Clune Sanitary protector.
US1537691A (en) * 1923-08-16 1925-05-12 American Voith Contact Co Centrifugal screen
GB372760A (en) * 1930-12-11 1932-05-11 Horace Waring Improvements in or relating to the drying and/or filtration of mixtures of liquids and solids
GB399300A (en) * 1932-08-05 1933-10-05 Frank Pascall Improvements in sifting or bolting machines for flour and other granular or pulverulent material
US2974796A (en) * 1957-09-04 1961-03-14 Jung Johannes Centrifugal-type pulp separator
US3394809A (en) * 1965-01-25 1968-07-30 Hunter Allen Bruce Pulp screens
FR1448814A (en) * 1965-04-15 1966-08-12 Ingersoll Rand Canada Screening apparatus
US3616904A (en) * 1968-06-11 1971-11-02 Ahlstroem Oy Apparatus for treating discrete materials
FI51221C (en) * 1972-06-21 1976-11-10 Yhtyneet Paperitehtaat Oy Pressure sieve device.
CA1009583A (en) * 1973-03-23 1977-05-03 Sydney W.H. Hooper Two stage pressure pulp screen device with stationary cylindrical screen
SU606635A1 (en) * 1976-02-11 1978-05-15 Государственный проектно-конструкторский институт "Гипромашуглеобогащение" Screen
DE2712749A1 (en) * 1977-03-23 1979-02-08 Finckh Maschf SORTER FOR SITING FIBER SUSPENSIONS
DE2850385C2 (en) * 1978-11-21 1981-02-05 J.M. Voith Gmbh, 7920 Heidenheim Device for separating impurities from pulp suspensions
US4440635A (en) * 1979-03-29 1984-04-03 Haigh M. Reiniger Process and apparatus for the recovery of cellulose fibers from paper-plastic mixtures
US4267035A (en) * 1979-08-27 1981-05-12 The Black Clawson Company Pressurized rotary screening apparatus
DE3006482C2 (en) * 1980-02-21 1983-04-14 J.M. Voith Gmbh, 7920 Heidenheim Rotary sorter
US4302327A (en) * 1980-03-17 1981-11-24 The Black Clawson Company Center flow screening apparatus
FR2498650B2 (en) * 1981-01-23 1986-03-21 Lamort E & M DEVICE FOR PURIFYING AND RECOVERING PULP
US4396502A (en) * 1982-03-18 1983-08-02 Beloit Corporation Screening apparatus for a papermaking machine
DE3221788C1 (en) * 1982-06-09 1983-11-03 J.M. Voith Gmbh, 7920 Heidenheim Rotating sorting drum
US4462900A (en) * 1982-07-16 1984-07-31 Beloit Corporation Centrifugal pulp screening device and method
DE3238742A1 (en) * 1982-10-20 1984-04-26 Escher Wyss Gmbh, 7980 Ravensburg Process for the sorting of fibre material, especially for paper making, and sorting apparatus for carrying out the process

Also Published As

Publication number Publication date
BR8800535A (en) 1988-09-27
ES2021399B3 (en) 1991-11-01
DE3703831C2 (en) 1988-12-08
KR880010188A (en) 1988-10-07
US4911828A (en) 1990-03-27
EP0278260A2 (en) 1988-08-17
DE3861867D1 (en) 1991-04-11
JPS63288290A (en) 1988-11-25
ATE61429T1 (en) 1991-03-15
EP0278260A3 (en) 1989-02-15
DE3703831A1 (en) 1988-09-08
KR960004539B1 (en) 1996-04-06
CA1330207C (en) 1994-06-14

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