EP0250921A2 - Air classifier - Google Patents

Air classifier Download PDF

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Publication number
EP0250921A2
EP0250921A2 EP87108132A EP87108132A EP0250921A2 EP 0250921 A2 EP0250921 A2 EP 0250921A2 EP 87108132 A EP87108132 A EP 87108132A EP 87108132 A EP87108132 A EP 87108132A EP 0250921 A2 EP0250921 A2 EP 0250921A2
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EP
European Patent Office
Prior art keywords
air
rotor
classifying
spiral
fine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP87108132A
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German (de)
French (fr)
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EP0250921B1 (en
EP0250921A3 (en
Inventor
Gotthardt Dipl.-Ing. Blasczyk
Heinrich Dipl.-Ing. Henne
Hubert Dipl.-Ing. Eickholt
Otte Dipl.-Ing. Heinemann
Norbert Bredenhöller
Peter Dipl.-Ing. Tiggesbäumker
Ludger Dipl.-Ing. Kimmeyer
Michael Dr.-Ing. Von Seebach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Industrial Solutions AG
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Krupp Polysius AG
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Publication of EP0250921A2 publication Critical patent/EP0250921A2/en
Publication of EP0250921A3 publication Critical patent/EP0250921A3/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
    • 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
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/04—Control arrangements

Definitions

  • the invention relates to a classifier according to the preamble of claim 1.
  • a classifier according to the preamble of claim 1 is known for example from US-A-4296864.
  • the visible space is formed here by the annular space which is present between the stationary air guiding elements arranged at the outlet end of the classifying air supply spiral and the rotor blades.
  • the visible material is placed on the upper face of the rotor, carried outwards and redirected into the viewing space, which it then travels from top to bottom. While the coarse material falls out of the viewing area downwards, the fine material is taken into the rotor by the classifying air and leaves the rotor together with the classifying air through the upper or lower end face.
  • the invention has for its object to develop a classifier according to the preamble of claim 1 to the effect that the selectivity is improved and in particular entrainment of coarse material is avoided by the fine air loaded with sifting air.
  • the spiral for supplying the classifying air is therefore divided by dividing walls into at least two channels one above the other, from which the classifying air flows into the classifying room at different heights. This prevents the sight air from penetrating only part of the height of the sight space.
  • the individual channels with elements for adjusting the amount and / or Ge speed of the air supplied through the individual channels.
  • the amount and / or the speed of the sight air flowing into the individual height areas of the sight space can be optimally adapted to the respective conditions, in particular the load in the individual sight space areas. If the distribution of the classifying air in the vertical direction is controlled and adjusted in this way before entering the classifying room, it is particularly avoided that the classifying air flows into the lower area of the classifying room and leads to undesired entrainment of coarse particles into the fine material room, while the sighting in the upper area of the visual space is deteriorated at the same time.
  • the setting option according to the invention can therefore achieve a significant improvement in the separating power of the classifier.
  • the housing of the sifter shown contains in the upper area a spiral 1 for supplying the viewing air, which opens tangentially into the viewing space 2 and is divided into two channels 5, 6 and 7, one above the other, by two horizontal dividing walls 3, 4.
  • elements designed as adjustable flaps 8, 9, 10 are provided for setting the amount of air supplied to the individual channels 5, 6, 7.
  • the flaps 8, 9, 10 arranged in pairs are actuated, for example, via setting levers 11 and chains 12, the flaps 8, 9 and 10 being adjustable independently of one another.
  • a rotor 13 is arranged in the classifier housing and can be rotated about a vertical axis 14 and is driven via a shaft 15 by a motor (not illustrated) arranged on the classifier housing.
  • the rotor 13 is covered on its circumference with rotor blades 16 which are supported by ring disks 17 which are connected via webs 18 to a bush 19 surrounding the shaft 15.
  • the shaft 15 is supported at the lower end in a bearing 20 which is supported by radial struts 21.
  • the lower end face of the rotor 13 is open and has radially extending struts 22.
  • the upper end face of the rotor 13 is formed by a plate 23 which carries radially arranged distributor strips 24 on its upper side.
  • a deflection ring 27 is provided at a distance from the circumference of the plate 23, which deflects the visible material thrown off the plate 23 downward into the viewing space 2.
  • the classifier housing is provided with a funnel 28 for removing the coarse material. Furthermore, there is a further funnel 29 below the open lower end face of the rotor 13, to which a plurality of connections 30 (for example four connections 30 evenly distributed on the circumference) are connected in the exemplary embodiment shown.
  • Air guiding elements 31 are provided at the outlet end of the spiral 1 for supplying the classifying air. As FIG. 2 shows, these air guide elements 31 are inclined in the sense of the flow direction of the viewing air flowing approximately tangentially into the viewing space 2.
  • the visible material which is fed in via the air conveyor trough 25 and the distributor bell 26 in a uniform distribution to the center of the plate 23 is conveyed outwards by the movement of the rotor 13 and is thereby evened out by the distributor strips 24.
  • the visible material is thrown off the plate 23 with a moderate radial speed component and deflected downward by the deflection ring 27. It then penetrates the view space 2 from top to bottom in the form of a uniform good veil.
  • the classifying air is supplied to the spiral 1 via the channels 5, 6 and 7, the amount of classifying air flowing into the individual height areas of the classifying area 2 being optimally adapted to the respective conditions by adjusting the flaps 8, 9 and 10. Since there is generally a larger load in the upper area of the viewing space 2, it is usually expedient to operate the upper duct 5 with a larger amount of air than the lower duct 7.
  • the fine and coarse goods are separated. While the coarse material falls down and is discharged through the funnel 28, the fine material together with the classifying air reaches the interior of the rotor 13 and is discharged via the connections 30.
  • the air guiding elements 31 at the outlet end the spiral 1 serve to maintain the swirl of the air flow, while the rotor blades 16 primarily fulfill the task of preventing coarse material particles adhering to the fine material from entering the interior of the rotor 13.
  • the sifted air discharged via the connections 30 and loaded with fine material reaches one or more external separators, in which the fine material (finished product) is separated from the sifted air.
  • the classifying air can then be fed to the spiral 1 again via an external air circulation fan (air circulation mode). Instead, however, it is also possible to discard the fine air that has been freed from the fine material (possibly after further dedusting) and to suck in the clear air from the environment (one pass of the clear air through the classifier).
  • the fine air loaded with fine material can also be drawn off through the upper end of the rotor.
  • a system of channels arranged in a star shape is expediently provided on the upper end face of the rotor instead of a closed plate 23, which are only open at their inner and outer ends and through which the visible material fed centrally via the distributor bell 26 is fed to the viewing space 2 .
  • the spiral 1 is arranged in three above one another Nete channels 5, 6 and 7 is divided, it is of course also possible within the scope of the invention to provide only two or more than three channels.
  • the spiral 1 also has a second air inlet opening 32, which is offset on the circumference by approximately 180 ° with respect to the other air inlet opening 33. Also in the area of this second air inlet opening 32, elements (e.g. flaps) are provided for setting the amount of air supplied through the individual channels. Such additional air inlet openings promote the maintenance of the swirl with which the classifying air enters the classroom 2.
  • the setting option according to the invention not only achieves a significant improvement in the separating power of the classifier, but it also reduces the specific air requirement of the classifier overall, which enables considerable energy savings.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

Die Erfindung betrifft einen Sichter, bei dem die Spirale zur Zuführung der Sichtluft in mehrere übereinanderliegende Kanäle (5, 6, 7) unterteilt ist, in denen Elemente zur Einstellung der durch die einzelnen Kanäle zugeführten Sichtluftmenge vorgesehen sind. Bei einem derartigen Sichter kann die Sichtluftmenge in den einzelnen Bereichen des Sichtraumes optimal angepaßt werden, was zu einer wesentlichen Verbesserung der Trennschärfe führt.The invention relates to a classifier in which the spiral for supplying the classifying air is subdivided into a plurality of channels (5, 6, 7) one above the other, in which elements are provided for setting the quantity of classifying air supplied through the individual channels. With such a classifier, the quantity of classifying air can be optimally adapted in the individual areas of the classifying room, which leads to a significant improvement in the selectivity.

Description

Die Erfindung betrifft einen Sichter ensprechend dem Oberbegriff des Anspruches 1.The invention relates to a classifier according to the preamble of claim 1.

Ein Sichter entsprechend dem Oberbegriff des An­spruches 1 ist beispielsweise durch die US-A-4296864 bekannt. Der Sichtraum wird hierbei durch den Ringraum gebildet, der zwischen den am austrittsseitigen Ende der Sichtluft-Zuführungs­spirale angeordneten ortsfesten Luftleitelementen und den Rotorschaufeln vorhanden ist. Das Sichtgut wird auf die obere Stirnseite des Rotors aufgegeben, nach außen getragen und in den Sichtraum umgelenkt, den es anschließend von oben nach unten durchwan­dert. Während das Grobgut aus dem Sichtraum nach unten ausfällt, wird das Feingut von der Sichtluft mit in den Rotor genommen und verläßt den Rotor zusammen mit der Sichtluft durch die obere oder untere Stirnseite.A classifier according to the preamble of claim 1 is known for example from US-A-4296864. The visible space is formed here by the annular space which is present between the stationary air guiding elements arranged at the outlet end of the classifying air supply spiral and the rotor blades. The visible material is placed on the upper face of the rotor, carried outwards and redirected into the viewing space, which it then travels from top to bottom. While the coarse material falls out of the viewing area downwards, the fine material is taken into the rotor by the classifying air and leaves the rotor together with the classifying air through the upper or lower end face.

Der Erfindung liegt die Aufgabe zugrunde, einen Sichter entsprechend dem Oberbegriff des Anspruches 1 dahingehend weiterzuentwickeln, daß die Trennschärfe verbessert und insbesondere ein Mitreißen von Grob­gut durch die mit Feingut beladene Sichtluft ver­mieden wird.The invention has for its object to develop a classifier according to the preamble of claim 1 to the effect that the selectivity is improved and in particular entrainment of coarse material is avoided by the fine air loaded with sifting air.

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

Eingehende Untersuchungen des oben erwähnten be­kannten Sichters ergaben, daß die dort vielfach festzustellende mangelnde Trennschärfe, insbesondere die Gefahr eines Mitreißens von Grobgut in den mit Feingut beladenen Luftstrom, durch eine nicht opti­male Luftverteilung über die Höhe des Sichtraumes bedingt ist. Da das Sichtgut von oben in den Sicht­raum eingeführt wird und bei seiner Abwärtsbewegung durch den Sichtraum das Feingut zunehmend in den Rotor austritt, ergibt sich eine Verringerung der Gutbeladung im unteren Bereich des Sichtraumes. Wird andererseits die Sichtluft durch die untere Stirn­seite des Rotors abgezogen, so hat die durch die Spirale zugeführte Sichtluft das Bestreben, den Sichtraum vorwiegend im unteren Bereich zu durch­setzen. Auf diese Weise ergeben sich im unteren Bereich des Sichtraumes erhöhte Strömungsgeschwindig­keiten, die leicht zu einem Mitreißen von Grobgut­teilchen in den Feingutraum führen.In-depth investigations of the above-mentioned known classifier showed that the lack of selectivity, which can often be found there, in particular the risk of coarse material being entrained in the air stream laden with fine material, is due to a non-optimal air distribution over the height of the viewing area. Since the visible material is introduced into the visible space from above and the fine material increasingly exits into the rotor as it moves downward through the visible space, there is a reduction in the good load in the lower region of the visible space. On the other hand, if the classifying air is drawn off through the lower end of the rotor, the classifying air supplied by the spiral tends to penetrate the classifying area mainly in the lower area. In this way, there are increased flow velocities in the lower region of the visual space, which easily lead to coarse material particles being carried into the fine material space.

Erfindungsgemäß wird daher die Spirale zur Zuführung der Sichtluft durch Trennwände in wenigstens zwei übereinanderliegende Kanäle unterteilt, aus denen die Sichtluft in unterschiedlicher Höhe in den Sicht­raum einströmt. Damit wird vermieden, daß die Sicht­luft nur einen Teil der Höhe des Sichtraumes durch­setzt.According to the invention, the spiral for supplying the classifying air is therefore divided by dividing walls into at least two channels one above the other, from which the classifying air flows into the classifying room at different heights. This prevents the sight air from penetrating only part of the height of the sight space.

Erfindungsgemäß sind ferner die einzelnen Kanäle mit Elementen zur Einstellung der Menge und/oder Ge­ schwindigkeit der durch die einzelnen Kanäle zuge­führten Sichtluft versehen. Auf diese Weise kann man die Menge und/oder die Geschwindigkeit der in die einzelnen Höhenbereiche des Sichtraumes ein­strömenden Sichtluft den jeweiligen Verhältnissen, insbesondere der Gutbeladung in den einzelnen Sichtraumbereichen optimal anpassen. Wird auf diese Weise die Verteilung der Sichtluft in vertikaler Richtung vor Eintritt in den Sichtraum kontrolliert und eingestellt, so wird insbesondere vermieden, daß die Sichtluft verstärkt in den unteren Bereich des Sichtraumes einströmt und hier zu einem uner­wünschten Mitreißen von Grobgutteilchen in den Fein­gutraum führt, während die Sichtung im oberen Be­reich des Sichtraumes gleichzeitig verschlechtert wird. Durch die erfindungsgemäße Einstellmöglich­keit läßt sich daher eine wesentliche Verbesserung der Trennschärfe des Sichters erzielen.According to the invention are also the individual channels with elements for adjusting the amount and / or Ge speed of the air supplied through the individual channels. In this way, the amount and / or the speed of the sight air flowing into the individual height areas of the sight space can be optimally adapted to the respective conditions, in particular the load in the individual sight space areas. If the distribution of the classifying air in the vertical direction is controlled and adjusted in this way before entering the classifying room, it is particularly avoided that the classifying air flows into the lower area of the classifying room and leads to undesired entrainment of coarse particles into the fine material room, while the sighting in the upper area of the visual space is deteriorated at the same time. The setting option according to the invention can therefore achieve a significant improvement in the separating power of the classifier.

Zweckmäßige Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Appropriate embodiments of the invention are the subject of the dependent claims.

Ein Auführungsbeispiel der Erfindung ist in der Zeichnung veranschaulicht. Es zeigen

  • Fig.1 einen Vertikalschnitt durch den er­findungsgemäßen Sichter,
  • Fig.2 einen Schnitt längs der Linie II der Fig.1,
  • Fig. 3 einen Schnitt längs der Linie III der Fig.2.
An exemplary embodiment of the invention is illustrated in the drawing. Show it
  • 1 shows a vertical section through the classifier according to the invention,
  • 2 shows a section along the line II of FIG. 1,
  • 3 shows a section along the line III of FIG.

Das Gehäuse des dargestellten Sichters enthält im oberen Bereich eine zur Zuführung der Sichtluft dienende Spirale 1, die tangential in den Sicht­raum 2 einmündet und die durch zwei horizontale Trennwände 3, 4 in drei übereinanderliegende Kanäle 5, 6 und 7 unterteilt ist. Im Eintrittsbereich der Spirale (vergleiche Fig.2 und 3) sind als verstell­bare Klappen 8, 9, 10 ausgebildete Elemente zur Einstellung der den einzelnen Kanälen 5, 6, 7 zuge­führten Luftmenge vorgesehen. Die Betätigung der paarweise angeordneten Klappen 8, 9, 10 erfolgt beispielsweise über Stellhebel 11 und Ketten 12, wobei die Klappen 8, 9 und 10 unabhängig voneinander einstellbar sind.The housing of the sifter shown contains in the upper area a spiral 1 for supplying the viewing air, which opens tangentially into the viewing space 2 and is divided into two channels 5, 6 and 7, one above the other, by two horizontal dividing walls 3, 4. In the entry area of the spiral (see FIGS. 2 and 3), elements designed as adjustable flaps 8, 9, 10 are provided for setting the amount of air supplied to the individual channels 5, 6, 7. The flaps 8, 9, 10 arranged in pairs are actuated, for example, via setting levers 11 and chains 12, the flaps 8, 9 and 10 being adjustable independently of one another.

Im Sichtergehäuse ist ein Rotor 13 angeordnet, der um eine vertikale Achse 14 drehbar ist und über eine Welle 15 von einem auf dem Sichtergehäuse ange­ordneten, nicht veranschaulichten Motor angetrieben wird.A rotor 13 is arranged in the classifier housing and can be rotated about a vertical axis 14 and is driven via a shaft 15 by a motor (not illustrated) arranged on the classifier housing.

Der Rotor 13 ist an seinem Umfang mit Rotorschaufeln 16 besetzt, die von Ringscheiben 17 getragen werden, die über Stege 18 mit einer die Welle 15 umgebenden Buchse 19 verbunden sind. Die Welle 15 ist am unteren Ende in einem Lager 20 gelagert, das von radialen Streben 21 getragen wird. Die untere Stirn­seite des Rotors 13 ist offen ausgebildet und weist radial verlaufende Streben 22 auf.The rotor 13 is covered on its circumference with rotor blades 16 which are supported by ring disks 17 which are connected via webs 18 to a bush 19 surrounding the shaft 15. The shaft 15 is supported at the lower end in a bearing 20 which is supported by radial struts 21. The lower end face of the rotor 13 is open and has radially extending struts 22.

Die obere Stirnseite des Rotors 13 wird durch einen Teller 23 gebildet, der an seiner Oberseite radial angeordnete Verteilerleisten 24 trägt.The upper end face of the rotor 13 is formed by a plate 23 which carries radially arranged distributor strips 24 on its upper side.

Zur Aufgabe des Sichtgutes auf den Teller 23 dient eine Luftförderrinne 25, an die sich eine Verteiler­glocke 26 anschließt, die die Welle 15 koaxial um­gibt und deren untere Öffnung 26a über dem Zentrum des Tellers 23 ausmündet.An air conveyor trough 25, to which a distributor bell 26 adjoins, coaxially surrounds the shaft 15 and whose lower opening 26a opens out above the center of the plate 23 serves to feed the material to be viewed onto the plate 23.

Mit Abstand gegenüber dem Umfang des Tellers 23 ist ein Ablenkring 27 vorgesehen, der das vom Teller 23 abgeworfene Sichtgut nach unten in den Sichtraum 2 umlenkt.A deflection ring 27 is provided at a distance from the circumference of the plate 23, which deflects the visible material thrown off the plate 23 downward into the viewing space 2.

Im unteren Bereich ist das Sichtergehäuse mit einem Trichter 28 zur Abführung des Grobgutes versehen. Weiterhin befindet sich unterhalb der offenen unteren Stirnseite des Rotors 13 ein weiterer Trichter 29, an den beim dargestellten Ausführungsbeispiel mehrere Anschlüsse 30 (beispielsweise vier gleichmäßig am Umfang verteilte Anschlüsse 30) angeschlossen sind.In the lower area, the classifier housing is provided with a funnel 28 for removing the coarse material. Furthermore, there is a further funnel 29 below the open lower end face of the rotor 13, to which a plurality of connections 30 (for example four connections 30 evenly distributed on the circumference) are connected in the exemplary embodiment shown.

Am austrittseitigen Ende der Spirale 1 zur Zuführung der Sichtluft sind Luftleitelemente 31 vorgesehen. Wie Fig.2 zeigt, sind diese Luftleitelemente 31 im Sinne der Strömungsrichtung der etwa tangential in den Sichtraum 2 einströmenden Sichtluft geneigt.Air guiding elements 31 are provided at the outlet end of the spiral 1 for supplying the classifying air. As FIG. 2 shows, these air guide elements 31 are inclined in the sense of the flow direction of the viewing air flowing approximately tangentially into the viewing space 2.

Die Funktion des dargestellten Sichters ist folgen­dermaßen:The function of the displayed sifter is as follows:

Das über die Luftförderrinne 25 und die Verteiler­glocke 26 in gleichmäßiger Verteilung auf das Zen­trum des Tellers 23 aufgegebene Sichtgut wird durch die Bewegung des Rotors 13 nach außen gefördert und hierbei durch die Verteilerleisten 24 zusätzlich vergleichmäßigt. Das Sichtgut wird mit mäßiger radia­ler Geschwindigkeitskomponente vom Teller 23 abge­worfen und durch den Ablenkring 27 nach unten umge­lenkt. Es durchsetzt dann in Form eines gleichmäßigen Gutschleiers den Sichtraum 2 von oben nach unten.The visible material which is fed in via the air conveyor trough 25 and the distributor bell 26 in a uniform distribution to the center of the plate 23 is conveyed outwards by the movement of the rotor 13 and is thereby evened out by the distributor strips 24. The visible material is thrown off the plate 23 with a moderate radial speed component and deflected downward by the deflection ring 27. It then penetrates the view space 2 from top to bottom in the form of a uniform good veil.

Die Sichtluft wird über die Kanäle 5, 6 und 7 der Spirale 1 zugeführt, wobei durch Einstellung der Klappen 8, 9 und 10 die Menge der in den einzelnen Höhenbereichen des Sichtraumes 2 einströmenden Sicht­luft den jeweiligen Verhältnissen optimal angepaßt wird. Da im allgemeinen im oberen Bereich des Sicht­raumes 2 eine größere Gutbeladung vorhanden ist, ist es meist zweckmäßig, den oberen Kanal 5 mit einer größeren Luftmenge als den unteren Kanal 7 zu betrei­ben.The classifying air is supplied to the spiral 1 via the channels 5, 6 and 7, the amount of classifying air flowing into the individual height areas of the classifying area 2 being optimally adapted to the respective conditions by adjusting the flaps 8, 9 and 10. Since there is generally a larger load in the upper area of the viewing space 2, it is usually expedient to operate the upper duct 5 with a larger amount of air than the lower duct 7.

Im Sichtraum 2 erfolgt die Trennung von Feingut und Grobgut. Während das Grobgut nach unten ausfällt und durch den Trichter 28 abgeführt wird, gelangt das Feingut zusammen mit der Sichtluft in das Innere des Rotors 13 und wird über die Anschlüsse 30 abgeführt. Die Luftleitelemente 31 am austrittseitigen Ende der Spirale 1 dienen zur Aufrechterhaltung des Dralles der Luftströmung, während die Rotorschau­feln 16 vorwiegend die Aufgabe erfüllen, am Feingut anhaftende Grobgutteilchen am Eintritt in das Innnere des Rotors 13 zu hindern.In the viewing room 2, the fine and coarse goods are separated. While the coarse material falls down and is discharged through the funnel 28, the fine material together with the classifying air reaches the interior of the rotor 13 and is discharged via the connections 30. The air guiding elements 31 at the outlet end the spiral 1 serve to maintain the swirl of the air flow, while the rotor blades 16 primarily fulfill the task of preventing coarse material particles adhering to the fine material from entering the interior of the rotor 13.

Die über die Anschlüsse 30 abgeführte, mit Feingut beladene Sichtluft gelangt zu einem oder mehreren äußeren Abscheidern, in denen das Feingut (Fertig­gut) von der Sichtluft getrennt wird. Die Sichtluft kann dann über einen äußeren Umluftventilator erneut der Spirale 1 zugeführt werden (Umluftbetrieb). Stattdessen ist es jedoch auch möglich, die vom Fein­gut befreite Sichtluft (eventuell nach weiterer Ent­staubung) zu verwerfen und die Sichtluft aus der Umgebung anzusaugen (einmaliger Durchgang der Sicht­luft durch den Sichter).The sifted air discharged via the connections 30 and loaded with fine material reaches one or more external separators, in which the fine material (finished product) is separated from the sifted air. The classifying air can then be fed to the spiral 1 again via an external air circulation fan (air circulation mode). Instead, however, it is also possible to discard the fine air that has been freed from the fine material (possibly after further dedusting) and to suck in the clear air from the environment (one pass of the clear air through the classifier).

Im Rahmen der Erfindung sind verschiedene Varianten möglich. So kann man beispielsweise die mit Feingut beladene Sichtluft auch durch die obere Stirnseite des Rotors abziehen. In diesem Falle wird an der oberen Stirnseite des Rotors statt eines geschlosse­nen Tellers 23 zweckmäßig ein System von sternförmig angeordneten Kanälen vorgesehen, die lediglich an ihrem inneren und äußeren Ende offen sind und durch die das zentral über die Verteilerglocke 26 zugeführte Sichtgut dem Sichtraum 2 zugeleitet wird.Various variants are possible within the scope of the invention. For example, the fine air loaded with fine material can also be drawn off through the upper end of the rotor. In this case, a system of channels arranged in a star shape is expediently provided on the upper end face of the rotor instead of a closed plate 23, which are only open at their inner and outer ends and through which the visible material fed centrally via the distributor bell 26 is fed to the viewing space 2 .

Während ferner bei dem dargestellten Ausführungs­beispiel die Spirale 1 in drei übereinander angeord­ nete Kanäle 5, 6 und 7 unterteilt ist, so ist es im Rahmen der Erfindung selbstverständlich auch möglich, nur zwei oder mehr als drei Kanäle vorzu­sehen.Furthermore, in the illustrated embodiment, the spiral 1 is arranged in three above one another Nete channels 5, 6 and 7 is divided, it is of course also possible within the scope of the invention to provide only two or more than three channels.

Eine weitere Variante ist in Fig.2 gestrichelt an­gedeutet. Hierbei weist die Spirale 1 noch eine zweite Lufteintrittsöffnung 32 auf, die am Umfang um etwa 180° gegenüber der anderen Lufteintritts­öffnung 33 versetzt ist. Auch im Bereich dieser zweiten Lufteintrittsöffnung 32 sind Elemente (z.B. Klappen) zur Einstellung der durch die ein­zelnen Kanäle zugeführten Luftmenge vorgesehen. Durch solche zusätzlichen Lufteintrittsöffnungen wird die Aufrechterhaltung des Dralles begünstigt, mit dem die Sichtluft in den Sichtraum 2 eintritt.Another variant is indicated by dashed lines in FIG. Here, the spiral 1 also has a second air inlet opening 32, which is offset on the circumference by approximately 180 ° with respect to the other air inlet opening 33. Also in the area of this second air inlet opening 32, elements (e.g. flaps) are provided for setting the amount of air supplied through the individual channels. Such additional air inlet openings promote the maintenance of the swirl with which the classifying air enters the classroom 2.

Durch die erfindungsgemäße Einstellmöglichkeit wird nicht nur eine wesentliche Verbesserung der Trennschärfe des Sichters erzielt, sondern es wird auch der spezifische Luftbedarf des Sichters ins­gesamt verringert, was eine beachtliche Energie­einsparung ermöglicht.The setting option according to the invention not only achieves a significant improvement in the separating power of the classifier, but it also reduces the specific air requirement of the classifier overall, which enables considerable energy savings.

Claims (7)

1. Sichter, enthaltend a) ein Sichtergehäuse mit einer tangential in den Sichtraum (2) einmündenden, mit Luftleit­elementen (31) versehenen Spirale (1) zur Zuführung der Sichtluft, einem Trichter (28) zur Abführung des Grobgutes sowie wenigstens einem Anschluß (30) zur Abführung der mit Feingut beladenen Sichtluft, b) einen um eine vertikale Achse (14) drehbaren Rotor (13), der an seinem Umfang mit Rotor­schaufeln (16) besetzt ist und im Bereich einer Stirnseite eine Öffnung zum Austritt der mit Feingut beladenen Sichtluft aufweist, c) Einrichtungen (25, 26, 27) zur Aufgabe des Sichtgutes auf die obere Stirnseite des Rotors (13) sowie zur Umlenkung des vom Rotor nach außen geführten Sichtgutes, so daß das Sicht­gut den zwischen den ortsfesten Luftleitele­menten (31) und den Rotorschaufeln (16) ge­bildeten ringförmigen Sichtraum (2) von oben nach unten durchsetzt, gekennzeichnet durch folgende Merkmale:
 d) die Spirale (1) zur Zuführung der Sichtluft ist durch Trennwände (3, 4) in wenigstens zwei übereinanderliegende Kanäle (5, 6, 7) unterteilt, aus denen die Sichtluft in unter­schiedlicher Höhe in den Sichtraum (2) ein­strömt, e) die einzelnen Kanäle (5, 6, 7) sind mit Ele­menten (8, 9, 10) zur Einstellung der Menge und/oder Geschwindigkeit der durch die ein­zelnen Kanäle (5, 6, 7) zugeführten Sichtluft versehen. 1. Sifter containing a) a classifier housing with a tangential in the classroom (2), with air guide elements (31) provided spiral (1) for supplying the classifying air, a funnel (28) for removing the coarse material and at least one connection (30) for removing the Fine air loaded with fine air, b) a rotor (13) which can be rotated about a vertical axis (14) and which is equipped with rotor blades (16) on its circumference and which has an opening in the region of an end face for the outlet of the visual air laden with fine material, c) Devices (25, 26, 27) for feeding the material to be sighted onto the upper end face of the rotor (13) and for deflecting the material to be sighted outwards from the rotor, so that the material to be sighted passes between the stationary air guiding elements (31) and the rotor blades ( 16) formed annular view space (2) from top to bottom, characterized by the following features:
d) the spiral (1) for supplying the classifying air is divided by partition walls (3, 4) into at least two channels (5, 6, 7) one above the other, from which the classifying air flows into the classifying room (2) at different heights, e) the individual channels (5, 6, 7) are provided with elements (8, 9, 10) for adjusting the quantity and / or speed of the visual air supplied through the individual channels (5, 6, 7). 2. Sichter nach Anspruch 1 dadurch gekennzeichnet, daß die Elemente zur Einstellung der durch die einzelnen Kanäle (5, 6, 7) zugeführten Luftmenge durch vorzugsweise im Eintrittsbereich der Spirale (1) angeordnete, verstellbare Klappen (8, 9, 10) gebildet werden.2. Sifter according to claim 1, characterized in that the elements for adjusting the amount of air supplied through the individual channels (5, 6, 7) are preferably formed by adjustable flaps (8, 9, 10) arranged in the entry region of the spiral (1) . 3. Sichter nach Anspruch 1, dadurch gekennzeichnet, daß die Spirale (1) mehrere über den Umfang ver­teilte Lufteintrittsöffnungen (32, 33) aufweist, wobei im Bereich jeder Lufteintrittsöffnung Ele­mente (8, 9, 10) zur Einstellung der durch die einzelnen Kanäle (5, 6, 7) zugeführten Luftmenge vorgesehen sind.3. Sifter according to claim 1, characterized in that the spiral (1) has a plurality of air inlet openings (32, 33) distributed over the circumference, wherein in the region of each air inlet opening elements (8, 9, 10) for setting the through the individual channels ( 5, 6, 7) supplied air quantity are provided. 4. Sichter nach Anspruch 1, dadurch gekennzeichnet, daß zur zentralen Aufgabe des Sichtgutes auf die obere Stirnseite des Rotors (13) eine koaxial zur Antriebswelle (15) des Rotors (13) angeord­nete Verteilerglocke (26) vorgesehen ist, in die eine Luftförderrinne (25) einmündet.4. Sifter according to claim 1, characterized in that a coaxial to the central task of the material on the upper end face of the rotor (13) to the drive shaft (15) of the rotor (13) arranged distributor bell (26) is provided, into which an air conveyor trough (25) opens. 5. Sichter nach Anspruch 1, dadurch gekennzeichnet, daß die untere Stirnseite des Rotors (13) offen ist und im unteren Bereich des Sichtergehäuses wenigstens ein Anschluß (30) zur Abführung der mit Feingut beladenen Sichtluft vorgesehen ist.5. Sifter according to claim 1, characterized in that the lower end face of the rotor (13) is open and in the lower region of the sifter housing at least one connection (30) is provided for removing the fine air laden with fine material. 6. Sichter nach Anspruch 5, dadurch gekennzeichnet, daß die obere Stirnseite des Rotors (13) durch einen zur Verteilung des Sichtgutes dienenden Teller (23) gebildet wird, der an seiner Ober­seite vorzugsweise radial angeordnete Verteiler­leisten (24) trägt.6. Sifter according to claim 5, characterized in that the upper end face of the rotor (13) is formed by a serving for distributing the material to be seen plate (23), which preferably carries radially arranged distributor strips (24) on its upper side. 7. Sichter nach Anspruch 1, dadurch gekennzeichnet, daß die Welle (15) des Rotors (13) an ihrem unteren Ende in einem von radialen Streben (21) getragenen Lager (20) gelagert ist.7. A classifier according to claim 1, characterized in that the shaft (15) of the rotor (13) is mounted at its lower end in a bearing (20) supported by radial struts (21).
EP87108132A 1986-07-03 1987-06-04 Air classifier Expired - Lifetime EP0250921B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3622413A DE3622413C2 (en) 1986-07-03 1986-07-03 Classifier
DE3622413 1986-07-03

Publications (3)

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EP0250921A2 true EP0250921A2 (en) 1988-01-07
EP0250921A3 EP0250921A3 (en) 1989-08-30
EP0250921B1 EP0250921B1 (en) 1995-12-27

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EP87108132A Expired - Lifetime EP0250921B1 (en) 1986-07-03 1987-06-04 Air classifier

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US (1) US4792393A (en)
EP (1) EP0250921B1 (en)
DE (2) DE3622413C2 (en)
ES (1) ES2080716T3 (en)
IN (1) IN170755B (en)

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EP0374491A2 (en) * 1988-12-22 1990-06-27 Krupp Polysius Ag Sifter
EP0734787A1 (en) * 1995-03-28 1996-10-02 OMYA GmbH Mounting of the shaft in a centrifugal sifter
CN106061630B (en) * 2014-02-01 2019-03-29 Khd洪保德韦达克有限公司 The staged sifter of annular and the basket-hanging sifter for being connected to downstream

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DE3808023A1 (en) * 1988-03-10 1989-09-21 Krupp Polysius Ag Separator
DE3808022A1 (en) * 1988-03-10 1989-09-21 Krupp Polysius Ag Separator
DE4014342C2 (en) * 1990-05-04 1994-06-23 Heinz Jaeger Air classifier
DE9015363U1 (en) * 1990-11-08 1991-01-17 Christian Pfeiffer Maschinenfabrik GmbH & Co KG, 4720 Beckum Device for material dispersion
DE19511313C2 (en) * 1995-03-28 1997-07-17 Gkn Walterscheid Getriebe Gmbh Switching device for a gear transmission
FR2741286B1 (en) * 1995-11-21 1998-01-23 Fcb AIR SEPARATOR WITH CENTRIFUGAL ACTION
DE19606672A1 (en) * 1996-02-22 1997-08-28 Krupp Polysius Ag Classifier
DE19708956A1 (en) * 1997-03-05 1998-09-10 Krupp Polysius Ag Separator for cement mills etc
DE19811385C2 (en) * 1998-03-16 2003-08-28 Motan Materials Handling Gmbh Granulate flow divider for counterflow classifiers
DE10022536A1 (en) * 2000-05-09 2001-11-29 Loesche Gmbh Mill classifier
EP1561519A1 (en) * 2004-02-04 2005-08-10 Magotteaux International S.A. Particle classifier
DE102006044833B4 (en) * 2006-09-20 2010-01-21 Babcock Borsig Service Gmbh Centrifugal separator and method for sifting
US8172088B2 (en) * 2010-03-08 2012-05-08 Laitram, L.L.C. Air separator
WO2014117031A1 (en) 2013-01-24 2014-07-31 Lp Amina Llc Classifier
EP3127621A4 (en) * 2014-03-31 2017-12-06 Hosokawa Micron Corporation Classifier
CN109821744B (en) * 2019-03-05 2021-02-19 无锡锡麦粮油装备工程有限公司 Air volume adjusting device for powder cleaner
CN111774304A (en) * 2020-06-30 2020-10-16 湖北北新建材有限公司 Device for automatically separating large particles from gypsum

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EP0374491A2 (en) * 1988-12-22 1990-06-27 Krupp Polysius Ag Sifter
EP0374491A3 (en) * 1988-12-22 1991-12-11 Krupp Polysius Ag Sifter
EP0734787A1 (en) * 1995-03-28 1996-10-02 OMYA GmbH Mounting of the shaft in a centrifugal sifter
CN106061630B (en) * 2014-02-01 2019-03-29 Khd洪保德韦达克有限公司 The staged sifter of annular and the basket-hanging sifter for being connected to downstream

Also Published As

Publication number Publication date
DE3622413C2 (en) 1995-08-03
ES2080716T3 (en) 1996-02-16
EP0250921B1 (en) 1995-12-27
EP0250921A3 (en) 1989-08-30
IN170755B (en) 1992-05-16
US4792393A (en) 1988-12-20
DE3622413A1 (en) 1988-01-07
DE3751648D1 (en) 1996-02-08

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