EP0115057A2 - Pneumatic separator in the field of fine material - Google Patents

Pneumatic separator in the field of fine material Download PDF

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Publication number
EP0115057A2
EP0115057A2 EP83113017A EP83113017A EP0115057A2 EP 0115057 A2 EP0115057 A2 EP 0115057A2 EP 83113017 A EP83113017 A EP 83113017A EP 83113017 A EP83113017 A EP 83113017A EP 0115057 A2 EP0115057 A2 EP 0115057A2
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EP
European Patent Office
Prior art keywords
classifying
air
wheels
axis
classifier
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Granted
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EP83113017A
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German (de)
French (fr)
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EP0115057A3 (en
EP0115057B1 (en
Inventor
Roland Dr.-Ing. Nied
Herbert Dipl.-Ing. Horlamus
Fritz Kaiser
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Hosokawa Alpine AG
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Alpine AG
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Priority to AT83113017T priority Critical patent/ATE27556T1/en
Publication of EP0115057A2 publication Critical patent/EP0115057A2/en
Publication of EP0115057A3 publication Critical patent/EP0115057A3/en
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Publication of EP0115057B1 publication Critical patent/EP0115057B1/en
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    • 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

Definitions

  • the invention relates to an air classifier, consisting of a vertical-axis viewing chamber with a cylindrical upper part and a funnel-shaped lower part and a viewing device arranged in the upper part in the form of a rotating classifying wheel, which is flowed from the outside to the inside in a direction opposite to its centrifugal direction has running blades, the visual goods either being fed together with the visual air flowing in through the lower opening of the lower part or directly into the visual chamber, the coarse material being discharged through the lower opening of the lower part and the fine material together with the visual air coming out of the classifying wheel through an upward direction the outlet pipe emerging from the classifier is withdrawn.
  • An air classifier of the type mentioned above, in which the material to be viewed is fed into the classifying chamber, dispersed in the classifying air. is z. B. in GB-PS 927 876 described.
  • DE-PS 17 57 582 shows a wind separator of the same type with direct supply of the material to be classified into the viewing chamber.
  • the separation limit which can be achieved with such air classifiers essentially depends on the diameter and the peripheral speed of the classifying wheel. For a given size, the lower the separation limit, the higher the peripheral speed or speed of the classifying wheel is selected. Increasing the class of the visible wheel also results in a rapid increase in wear and energy requirements, so that economical work is only possible down to a certain cut-off limit.
  • the peripheral speed of the classifying wheel and the radial speed of the classifying air are kept constant when entering the classifying wheel on the classifying wheel circumference, the separating limit becomes larger as the classifying wheel diameter increases and thus correspondingly increases Throughput is also larger, ie it is shifted to a larger grain area. Therefore, if a large classifying wheel is to cut just as finely as a small one, the peripheral speed must also be increased. However, this means that, in addition to increased wear and energy requirements, strength and storage problems also arise.
  • the invention is therefore based on the object of providing an air classifier of the type required, with which high throughputs can be achieved economically, even in the finest range, while avoiding the disadvantages mentioned above.
  • This object is achieved in that at least two identical, individually driven classifying wheels designed for fine classifying are arranged as classifying devices in the classifying chamber of the air classifier.
  • the arrangement according to the invention has the following advantages: there is a compact design in which only one fine material line and a lateral conveying or metering device opening into the classifying chamber are required for the classifying material supply.
  • the visible material can also be dispersed in the visible air in a manner known per se and can be supplied with it through the lower opening of the lower part of the air classifier.
  • the air classifier z. B. can also be assembled particularly easily with an air-powered fine mill, in particular with a fluidized bed jet mill, by attaching it from below to the lower part of the air classifier.
  • the ground material then carried up by the grinding air from the mill becomes the feed material of the classifier and the grinding air itself becomes the visible air.
  • the classifying wheels can be arranged in such a way that their axes of rotation are arranged in a plane perpendicular to the classifier axis or on the surface of an imaginary circular cone, the axis of which is the classifier axis.
  • the arrangement of a common, centrally located outlet port for classifying air and fine material is particularly simple.
  • an arrangement of the classifying wheels can also be advantageous, in which the axes of rotation of the classifying wheels run in a plane perpendicular to the classifying axis and parallel to one another and adjacent classifying wheels are arranged offset from one another by at least the classifying wheel height. Any number of classifying wheels can be accommodated in the smallest possible space, without neighboring classifying wheels being able to influence one another through the coarse material they each throw off.
  • Classifying wheels are preferably used which, in a manner known per se, have a multiplicity of narrow blades which run radially or obliquely to the classifying wheel circumference, because their spraying grain strength and their insensitivity to fluctuations in the quantity and distribution of the task size make them particularly suitable for solving the task at hand.
  • the exemplary embodiment shows a wind sifter 1 with a vertical axis 2, the viewing chamber of which consists of the cylindrical upper part 3 and the funnel-shaped lower part 4.
  • a cylindrical container 5 connected to the funnel-shaped lower part 4 with attached outlet funnel 6 is provided, the outer diameter of which is larger than the diameter of the lower opening of the funnel-shaped lower part 4, and into which the classifying air line 14 opens tangentially.
  • four classifying wheels 7 are arranged in a star shape, the rotational axes 8 of which lie in a plane perpendicular to the classifying axis 2 and extend radially to the latter.
  • the classifying wheels 7 are designed as paddle wheels which have a multiplicity of narrow blades 9 which run radially or obliquely to the class of the classifying wheels.
  • Each classifying wheel 7 is seated on a shaft 10 which is mounted in a bearing housing 11 which is laterally attached to the upper part 3.
  • Each classifying wheel 7 is driven by a three-phase motor via pulleys (not shown here), all three-phase motors being controlled jointly by a frequency converter.
  • the flow pattern of the incoming classifying air is determined by the guide vanes 15, which are aligned parallel to the classifying axis 2.
  • An airtight discharge element, for. B. a cell lock (not shown) for the excreted, falling down coarse is well attached to the flange of the discharge funnel 6 during operation of the air classifier 1.
  • a guide surface 16 is arranged concentrically to the sighting axis within the sighting chamber 3, 4, which is formed at the bottom as a cylinder jacket and at the top as an upwardly widening truncated cone jacket, the upper edge of which runs at a distance from the sighting wheels 7.
  • the cylinder diameter corresponds to the diameter of the lower opening of the lower part 4.
  • the guide surface 16 is connected to the upper part 3 via three struts 17. A height adjustability to adapt to different operating conditions is not provided in the embodiment shown here.
  • the dosing screw 18 attached to the side of the upper part 3 is used for supplying visible material.
  • the upper part 3 is designed divided on the flange 19 so that the lower part of the upper part 3 with guide surface 16, lower part 4, cylindrical container 5 and discharge funnel 6 can be removed as a coherent component for inspection or cleaning purposes.
  • the fine classifier formed by the classifying wheels 7, the separating limit of which is set independently of the quantity and grain distribution of the goods offered works together with a simple coarse classifier located in the area of the guide vanes 15, the separating limit of which depends very much on the material load in such a way that the separation limit moves into the fine range with increasing load and vice versa.
  • This has the effect that, in the start-up phase, coarse material automatically accumulates in the classifying chamber until the separation limit of the coarse classifier corresponds to that of the classifying wheels at a certain material load, thus achieving the continuous operating state.
  • These properties of the described air classifier contribute to the fact that high material throughputs with a sharp separation of fine material and coarse material down to the very finest range, ie. H. Separation limits less than 8 ⁇ m can be achieved.

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  • Combined Means For Separation Of Solids (AREA)
  • Cell Separators (AREA)

Abstract

A particle classifier comprising a casing, at least two separating wheels, a guide baffle, and a discharge conduit. The casing has a classification chamber and one or more openings that are provided to conduct air and particulate material into the classification chamber and to discharge course particles therefrom. The separating wheels are mounted in the classification chamber, and each wheel includes a multitude of blades forming openings for conducting fine particles into the interiors of the separating wheels. The guide baffle conducts air and particulate material entrained therewith upward to the separating wheels. The discharge conduit conducts from the separation chamber fine particles passing between the blade of the separating wheels.

Description

Die Erfindung bezieht sich auf einen Windsichter, bestehend aus einer vertikalachsigen Sichtkammer mit zylindrischem Oberteil und trichterförmigem Unterteil und aus einer im Oberteil angeordneten Sichtvorrichtung in Form eines entgegen seiner Schleuderrichtung von der Sichtluft von außen nach innen durchströmten rotierenden Sichtrades, welches kranzförmig angeordnete, parallel zur Rotationsachse verlaufende Schaufeln aufweist, wobei das Sichtgut entweder zusammen mit der durch die untere öffnung des Unterteils einströmenden Sichtluft oder unmittelbar in die Sichtkammer zugeführt, das Grobgut durch die untere öffnung des Unterteils abgeführt und das Feingut zusammen mit der Sichtluft aus dem Sichtrad durch einen nach oben aus dem Sichter austretenden Auslaßstutzen abgezogen wird.The invention relates to an air classifier, consisting of a vertical-axis viewing chamber with a cylindrical upper part and a funnel-shaped lower part and a viewing device arranged in the upper part in the form of a rotating classifying wheel, which is flowed from the outside to the inside in a direction opposite to its centrifugal direction has running blades, the visual goods either being fed together with the visual air flowing in through the lower opening of the lower part or directly into the visual chamber, the coarse material being discharged through the lower opening of the lower part and the fine material together with the visual air coming out of the classifying wheel through an upward direction the outlet pipe emerging from the classifier is withdrawn.

Ein Windsichter der vorstehend genannten Art, bei dem das Sichtgut in der Sichtluft dispergiert in die Sichtkammer zugeführt wird,. ist z. B. in GB-PS 927 876 beschrieben. Einen gattungsgleichen Windsichter mit unmittelbarer Zufuhr des Sichtgutes i-n die Sichtkammer zeigt DE-PS 17 57 582. Die mit solchen Windsichtern erzielbare Trenngrenze hängt im wesentlichen von dem Durchmesser und der Umfangsgeschwindigkeit des Sichtrades ab. Bei gegebener Baugröße ergibt sich also eine umso kleinere Trenngrenze, je höher die Umfangsgeschwindigkeit bzw. Drehzahl des Sichtrades gewählt wird. Mit Erhöhung der Sichtraddrehzahl ist aber auch ein rasches Ansteigen von Verschleiß und Energiebedarf verbunden, so daß ein wirtschaftliches Arbeiten nur bis zu einer bestimmten Trenngrenze herab möglich ist. Andererseits wird die Trenngrenze - wenn die Umfangsgeschwindigkeit des Sichtrades und die Radialgeschwindigkeit der Sichtluft bei ihrem Eintritt in das Sichtrad am Sichtradumfang konstant gehalten werden - mit größer werdendem Sichtraddurchmesser und damit entsprechend steigender Durchsatzmenge ebenfalls größer, d. h. sie wird in einen größeren Kornbereich verschoben. Soll daher ein großes Sichtrad genauso fein trennen wie ein kleines, so muß zusätzlich die Umfangsgeschwindigkeit erhöht werden. Das bedeutet aber, daß neben verstärktem Verschleiß und Energiebedarf dann noch Festigkeits- und Lagerungsprobleme auftreten.An air classifier of the type mentioned above, in which the material to be viewed is fed into the classifying chamber, dispersed in the classifying air. is z. B. in GB-PS 927 876 described. DE-PS 17 57 582 shows a wind separator of the same type with direct supply of the material to be classified into the viewing chamber. The separation limit which can be achieved with such air classifiers essentially depends on the diameter and the peripheral speed of the classifying wheel. For a given size, the lower the separation limit, the higher the peripheral speed or speed of the classifying wheel is selected. Increasing the class of the visible wheel also results in a rapid increase in wear and energy requirements, so that economical work is only possible down to a certain cut-off limit. On the other hand, if the peripheral speed of the classifying wheel and the radial speed of the classifying air are kept constant when entering the classifying wheel on the classifying wheel circumference, the separating limit becomes larger as the classifying wheel diameter increases and thus correspondingly increases Throughput is also larger, ie it is shifted to a larger grain area. Therefore, if a large classifying wheel is to cut just as finely as a small one, the peripheral speed must also be increased. However, this means that, in addition to increased wear and energy requirements, strength and storage problems also arise.

Der Erfindung liegt daher die Aufgabe zugrunde, einen Windsichter der vorausgesetzten Art zu schaffen, mit dem bei Meidung der oben erwähnten Nachteile auch im Feinstbereich in wirtschaftlicher Weise hohe Durchsätze erzielt werden können. Diese Aufgabe wird dadurch gelöst, daß mindestens zwei gleichartige, für eine Feinsichtung ausgelegte, einzeln angetriebene Sichträder als Sichtvorrichtung in der Sichtkammer des Windsichters angeordnet werden. Gegenüber der bloßen Parallelschaltung einzelner kleiner Sichter hat die erfindungsgemäße Anordnung folgende Vorteile: Es ergibt sich eine kompakte Bauform, bei der nur eine Feingutleitung und eine seitliche in die Sichtkammer mündende Förder- bzw. Dosiervorrichtung für die Sichtgutzufuhr erforderlich sind. Das Sichtgut kann aber auch in an sich bekannter Weise in der Sichtluft dispergiert sein und mit ihr durch die untere öffnung des Windsichter-Unterteils zugeführt werden. Damit kann der Windsichter z. B. auch besonders einfach mit einer luftbetriebenen Feinstmühle, insbesondere mit einer Fließbettstrahlmühle zusammengebaut werden,indem diese von unten her am Unterteil des Windsichters befestigt wird. Das dann von der Mahlluft aus der Mühle hochgetragene Mahlgut wird zum Aufgabegut des Sichters und die Mahlluft selbst zur Sichtluft.The invention is therefore based on the object of providing an air classifier of the type required, with which high throughputs can be achieved economically, even in the finest range, while avoiding the disadvantages mentioned above. This object is achieved in that at least two identical, individually driven classifying wheels designed for fine classifying are arranged as classifying devices in the classifying chamber of the air classifier. Compared to the mere parallel connection of individual small classifiers, the arrangement according to the invention has the following advantages: there is a compact design in which only one fine material line and a lateral conveying or metering device opening into the classifying chamber are required for the classifying material supply. However, the visible material can also be dispersed in the visible air in a manner known per se and can be supplied with it through the lower opening of the lower part of the air classifier. So that the air classifier z. B. can also be assembled particularly easily with an air-powered fine mill, in particular with a fluidized bed jet mill, by attaching it from below to the lower part of the air classifier. The ground material then carried up by the grinding air from the mill becomes the feed material of the classifier and the grinding air itself becomes the visible air.

Die Anordnung der Sichträder kann derart erfolgen, daß ihre Rotationsachsen in einer Ebene senkrecht zur Sichterachse oder auf dem Mantel eines gedachten Kreiskegels, dessen Achse die Sichterachse ist, angeordnet sind. In diesem Fall und bei radial zur Sichterachse verlaufenden Rotationsachsen der Sichträder im erstgenannten Fall ist die Anordnung eines allen Sichträdern gemeinsamen, zentral gelegenen Auslaßstutzens für Sichtluft und Feingut besonders einfach.The classifying wheels can be arranged in such a way that their axes of rotation are arranged in a plane perpendicular to the classifier axis or on the surface of an imaginary circular cone, the axis of which is the classifier axis. In this case and with the axes of rotation of the view running radially to the classifier axis wheels in the former case, the arrangement of a common, centrally located outlet port for classifying air and fine material is particularly simple.

Zur Bewältigung besonders großer Durchsatzmengen kann auch eine Anordnung der Sichträder von Vorteil sein, bei der die Rotationsachsen der Sichträder in einer Ebene senkrecht zur Sichterachse und parallel zueinander verlaufen und jeweils benachbarte Sichträder um mindestens die Sichtradhöhe gegeneinander versetzt angeordnet sind. Dabei lassen sich beliebig viele Sichträder auf möglichst kleinem Raum unterbringen, ohne daß sich benachbarte Sichträder durch das von ihnen jeweilig abgeschleuderte Grobgut gegenseitig beeinflussen können.To cope with particularly large throughputs, an arrangement of the classifying wheels can also be advantageous, in which the axes of rotation of the classifying wheels run in a plane perpendicular to the classifying axis and parallel to one another and adjacent classifying wheels are arranged offset from one another by at least the classifying wheel height. Any number of classifying wheels can be accommodated in the smallest possible space, without neighboring classifying wheels being able to influence one another through the coarse material they each throw off.

Bevorzugt werden Sichträder verwendet, die in an sich bekannter Weise eine Vielzahl schmaler, radial oder schräg zum Sichtradumfang verlaufender Schaufeln aufweisen, denn durch ihre Spritzkornfestigkeit und ihre Unempfindlichkeit gegen Schwankungen der Aufgabemenge und -kornverteilung sind sie besonders zur Lösung der gestellten Aufgabe geeignet.Classifying wheels are preferably used which, in a manner known per se, have a multiplicity of narrow blades which run radially or obliquely to the classifying wheel circumference, because their spraying grain strength and their insensitivity to fluctuations in the quantity and distribution of the task size make them particularly suitable for solving the task at hand.

Der Betrieb mehrerer gleichartiger Sichträder in einer gemeinsamen Sichtkammer setzt natürlich voraus, daß alle Sichträder auf eine gleiche, durch die jeweils geforderte Trenngrenze bestimmte Drehzahl eingestellt werden können und die eingestellte Drehzahl konstant gehalten wird. Zweckmäßig ist es deshalb, hierfür eine für alle Sichträder gemeinsame Steuereinrichtung vorzusehen, z. B. einen Frequenzumformer, über den die Antriebsmotoren aller Sichträder gemeinsam betrieben werden.The operation of several identical sight wheels in a common view chamber naturally presupposes that all sight wheels can be set to the same speed, determined by the required separation limit, and the set speed is kept constant. It is therefore advisable to provide a control device common to all classifying wheels, e.g. B. a frequency converter via which the drive motors of all classifying wheels are operated together.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt.An embodiment of the invention is shown in the drawing.

  • Fig. 1 zeigt einen Längsschnitt durch einen Windsichter mit vier Sichträdern,1 shows a longitudinal section through an air classifier with four classifying wheels,
  • Fig. 2 zeigt einen Querschnitt entlang der Linie I-I durch den Windsichter nach Fig. 1.FIG. 2 shows a cross section along the line I-I through the air classifier according to FIG. 1.

Das Ausführungsbeispiel zeigt einen Windsichter 1 mit lotrechter Achse 2, dessen Sichtkammer aus dem zylindrischen Oberteil.3 und dem trichterförmigen Unterteil 4 besteht. Zur Verbesserung des Wirkungsgrades der Sichtung durch Nachsichtung des nach unten aus dem trichterförmigen Unterteil 4 der Sichtkammer austretenden Grobgutes ist für die Sichtluftzufuhr ein an das trichterförmige Unterteil 4 anschließender zylindrischer Behälter 5 mit angesetzten Auslauftrichter 6 vorgesehen, dessen Außendurchmesser größer ist als der Durchmesser der unteren öffnung des trichterförmigen Unterteils 4, und in den die Sichtluftleitung 14 tangential mündet. Im Oberteil 3 sind sternförmig vier Sichträder 7 angeordnet, deren Rotatiönsachsen 8 in einer Ebene senkrecht zur Sichterachse 2 liegen und radial zu dieser verlaufen. Die Sichträder 7 sind als Schaufelräder ausgebildet, die eine Vielzahl schmaler, radial oder schräg zum Sichtradumfang verlaufender Schaufeln 9 aufweisen. Jedes Sichtrad 7 sitzt auf einer Welle 10, die in einem seitlich am Oberteil 3 befestigten Lagergehäuse 11 gelagert ist. Jedes Sichtrad 7 wird über hier nicht dargestellte Riemenscheiben von einem Drehstrommotor angetrieben,wobei alle Drehstrommotoren gemeinsam von einem Frequenzumformer gesteuert werden.The exemplary embodiment shows a wind sifter 1 with a vertical axis 2, the viewing chamber of which consists of the cylindrical upper part 3 and the funnel-shaped lower part 4. In order to improve the efficiency of the sighting by inspecting the coarse material emerging downwards from the funnel-shaped lower part 4 of the viewing chamber, a cylindrical container 5 connected to the funnel-shaped lower part 4 with attached outlet funnel 6 is provided, the outer diameter of which is larger than the diameter of the lower opening of the funnel-shaped lower part 4, and into which the classifying air line 14 opens tangentially. In the upper part 3, four classifying wheels 7 are arranged in a star shape, the rotational axes 8 of which lie in a plane perpendicular to the classifying axis 2 and extend radially to the latter. The classifying wheels 7 are designed as paddle wheels which have a multiplicity of narrow blades 9 which run radially or obliquely to the class of the classifying wheels. Each classifying wheel 7 is seated on a shaft 10 which is mounted in a bearing housing 11 which is laterally attached to the upper part 3. Each classifying wheel 7 is driven by a three-phase motor via pulleys (not shown here), all three-phase motors being controlled jointly by a frequency converter.

Die Austrittsöffnungen an den Sichträdern 7 für die feingutbeladene Sichtluft münden über austauschbare Rohrstücke 12 in einen zentralen Auslaßstutzen 13, an dem über eine nicht gezeichnete Rohrleitung ein Abscheider für das Feingut angeschlossen wird.The outlet openings on the classifying wheels 7 for the fine air laden visible air open via exchangeable pipe sections 12 into a central outlet connection 13, to which a separator for the fine material is connected via a pipeline (not shown).

Den Strömungsverlauf der eintretenden Sichtluft bestimmen die parallel zur Sichterachse 2 ausgerichteten Leitschaufeln 15. Ein luftdichtes Austragsorgan, z. B. eine Zellenschleuse (nicht dargestellt) für das ausgeschiedene, nach unten fallende Grobgut ist beim Betrieb des Windsichters 1 am Flansch des Auslauftrichters 6 befestigt.The flow pattern of the incoming classifying air is determined by the guide vanes 15, which are aligned parallel to the classifying axis 2. An airtight discharge element, for. B. a cell lock (not shown) for the excreted, falling down coarse is well attached to the flange of the discharge funnel 6 during operation of the air classifier 1.

Zur weiteren Verbesserung des Wirkungsgrades der Sichtung ist konzentrisch zur Sichterachse innerhalb der Sichtkammer 3, 4 eine Leitfläche 16 angeordnet, die unten als Zylindermantel und oben als sich nach oben erweiternder Kegelstumpfmantel, dessen Oberkante mit Abstand zu den Sichträdern 7 verläuft, ausgebildet ist. Der Zylinderdurchmesser entspricht dabei dem Durchmesser der unteren Öffnung von Unterteil 4. Ober drei Streben 17 ist die Leitfläche 16 mit dem Oberteil 3 verbunden. Eine Höhenverstellbarkeit zur Anpassung an unterschiedliche Betriebsverhältnisse ist bei der hier gezeigten Ausführungsform nicht vorgesehen.To further improve the efficiency of the sighting, a guide surface 16 is arranged concentrically to the sighting axis within the sighting chamber 3, 4, which is formed at the bottom as a cylinder jacket and at the top as an upwardly widening truncated cone jacket, the upper edge of which runs at a distance from the sighting wheels 7. The cylinder diameter corresponds to the diameter of the lower opening of the lower part 4. The guide surface 16 is connected to the upper part 3 via three struts 17. A height adjustability to adapt to different operating conditions is not provided in the embodiment shown here.

Die seitlich am Oberteil 3 befestigte Dosierschnecke 18 dient zur Sichtgutzufuhr.The dosing screw 18 attached to the side of the upper part 3 is used for supplying visible material.

Das Oberteil 3 ist am Flansch 19 geteilt ausgeführt, so daß der untere Teil von Oberteil 3 mit Leitfläche 16, Unterteil 4, zylindrischem Behälter 5 und Auslauftrichter 6 als zusammenhängendes Bauteil für Inspektions- oder Reinigungszwecke abgenommen werden 'kann.The upper part 3 is designed divided on the flange 19 so that the lower part of the upper part 3 with guide surface 16, lower part 4, cylindrical container 5 and discharge funnel 6 can be removed as a coherent component for inspection or cleaning purposes.

Die Wirkungsweise des Windsichters ist folgende:

  • Das durch die Dosierschnecke 18 eingetragene Sichtgut fällt im Umfangsbereich der Sichtkammer 3, 4 nach unten, wo es vorr der durch die Leitschaufeln 15 einströmende Sichtluft kräftig durchgespült wird, was eine vollständige Auflösung von Kornagglomeraten bewirkt. Die gröbsten Gutteilchen fallen nach unten in den Auslauftrichter 6, das übrige Gut wird von der Sichtluft innerhalb der Leitfläche 16 nach oben mitgerissen und den Sichträdern 7 zugeführt. Entsprechend der durch die eingestellte Drehzahl der Sichträder 7 bestimmten Trenngrenze wird es hier nun in Feingut und Grobgut aufgetrennt. Das Feingut tritt mit der Sichtluft durch die Schaufeln 9 hindurch und wird durch die Rohrstücke 12 und den Auslaßstutzen 13 abgeführt. Das durch die Schleuderwirkung der Schaufeln 9 abgewiesene Grobgut fällt im Umfangsbereich der Sichtkammern 3, 4 außerhalb der Leitfläche 16 wieder nach unten, wo es im Bereich der Leitschaufeln 15 von der Sichtluft erneut intensiv durchspült wird, so daß noch an den groben Teilchen haftende Feingutteilchen abgelöst werden. Ein Teil des Grobguts fällt nun in den Auslauftrichter 6 und wird von der darunter angeordneten Zellenschleuse ausgetragen, der Rest wird zusammen mit dem von der Dosierschnecke 18 eingetragenen Sichtgut wieder zu den Sichträdern 7 geführt.
The air classifier works as follows:
  • The visible material entered by the dosing screw 18 falls down in the peripheral region of the viewing chamber 3, 4, where it is flushed through the visible air flowing in through the guide vanes 15, which causes a complete dissolution of grain agglomerates. The coarsest particles of good fall downward into the discharge funnel 6, the remaining good is carried upward by the classifying air within the guide surface 16 and fed to the classifying wheels 7. According to the separation limit determined by the set speed of the classifying wheels 7, it is now separated into fine and coarse material. The fine material passes with the classifying air through the blades 9 and is through the pipe sections 12 and the outlet 13 led away. The coarse material rejected by the centrifugal effect of the blades 9 falls down again in the peripheral region of the viewing chambers 3, 4 outside the guide surface 16, where it is again intensively flushed by the visible air in the region of the guide blades 15, so that fine particles still adhering to the coarse particles are detached will. A part of the coarse material now falls into the discharge funnel 6 and is discharged from the cell lock arranged underneath, the rest is guided back to the classifying wheels 7 together with the visible material entered by the dosing screw 18.

Praktisch arbeitet hier also der von den Sichträdern 7 gebildete Feinsichter, dessen jeweils eingestellte Trenngrenze unabhängig ist von Menge und Kornverteilung des angebotenen Gutes, mit einem einfachen, im Bereich der Leitschaufeln 15 gelegenen Grobsichter zusammen, dessen Trenngrenze sehr stark von der Gutbelastung in der Weise abhängt, daß sich die Trenngrenze bei zunehmender Belastung in den Feinbereich bewegt und umgekehrt. Dies bewirkt, daß sich.in der Anlaufphase in der Sichtkammer automatisch Grobgut solange anreichert bis bei einer bestimmten Gutbelastung die Trenngrenze des Grobsichters der der Sichträder entspricht, womit der Dauerbetriebszustand erreicht ist. Diese Eigenschaften des beschriebenen Windsichters tragen mit dazu bei, daß hohe Gutdurchsätze bei scharfer Trennung von Feingut und Grobgut bis in den Feinstbereich, d. h. Trenngrenzen kleiner 8 um, erzielt werden können.In practice, the fine classifier formed by the classifying wheels 7, the separating limit of which is set independently of the quantity and grain distribution of the goods offered, works together with a simple coarse classifier located in the area of the guide vanes 15, the separating limit of which depends very much on the material load in such a way that the separation limit moves into the fine range with increasing load and vice versa. This has the effect that, in the start-up phase, coarse material automatically accumulates in the classifying chamber until the separation limit of the coarse classifier corresponds to that of the classifying wheels at a certain material load, thus achieving the continuous operating state. These properties of the described air classifier contribute to the fact that high material throughputs with a sharp separation of fine material and coarse material down to the very finest range, ie. H. Separation limits less than 8 µm can be achieved.

Claims (8)

1. Windsichter, bestehend aus einer vertikalachsigen Sichtkammer mit zylindrischem Oberteil und trichterförmigem Unterteil und aus einer im Oberteil angeordneten Sichtvorrichtung in Form eines entgegen seiner Schleuderrichtung von der Sichtluft von außen nach innen durchströmten rotierenden Sichtrades, welches kranzförmig angeordnete, parallel zur Rotationsachse verlaufende Schaufeln aufweist, wobei das Sichtgut entweder zusammen mit der durch die untere öffnung des Unterteils einströmenden Sichtluft oder unmittelbar in die Sichtkammer zugeführt, das Grobgut durch die untere Öffnung des Unterteils abgeführt und das Feingut zusammen mit der Sichtluft aus dem Sichtrad durch einen nach oben aus dem Sichter austretenden Auslaßstutzen abgezogen wird, dadurch gekennzeichnet , daß die Sichtvorrichtung aus mindestens zwei gleichartigen, für eine Feinsichtung ausgelegten, verfahrensmäßig parallelgeschalteten und einzeln angetriebenen Sichträdern (7) besteht.1. Wind sifter comprising a vertikalachsi g s viewing chamber with a cylindrical upper part and a funnel-shaped lower part and of a arranged in the upper part vision device in the form of a counter to its spin direction of the classifying air from outside to inside flow-through rotating separator wheel, which annularly arranged, extending parallel to the axis of rotation vanes the visual goods either together with the visual air flowing in through the lower opening of the lower part or directly into the visual chamber, the coarse material discharged through the lower opening of the lower part and the fine material together with the visual air from the classifying wheel through an upward from the classifier emerging outlet nozzle is withdrawn, characterized in that the viewing device consists of at least two identical, designed for fine viewing, procedurally connected in parallel and individually driven classifying wheels (7). 2. Windsichter nach Anspruch 1, dadurch gekennzeichnet , daß die Rotationsachsen (8) der Sichträder (7) in einer Ebene senkrecht zur Sichterachse (2) angeordnet sind.2. Air classifier according to claim 1, characterized in that the axes of rotation (8) of the classifying wheels (7) are arranged in a plane perpendicular to the classifier axis (2). 3. Windsichter nach Anspruch 2, dadurch gekennzeichnet , daß die Rotationsachsen (8) der Sichträder (7) radial zur Sichterachse (2) verlaufen.3. Air classifier according to claim 2, characterized in that the axes of rotation (8) of the classifying wheels (7) extend radially to the classifier axis (2). 4. Windsichter nach Anspruch 1, dadurch gekennzeichnet , daß die Rotationsachsen (8) der Sichträder (7) auf dem Mantel eines gedachten Kreiskegels angeordnet sind, dessen Achse die Sichterachse (2) ist.4. Air classifier according to claim 1, characterized in that the axes of rotation (8) of the classifying wheels (7) are arranged on the jacket of an imaginary circular cone, the axis of which is the classifier axis (2). 5. Windsichter nach Anspruch 3 oder 4, dadurch gekennzeichnet , daß die Sichträder (7) einen gemeinsamen, zentral gelegenen Auslaßstutzen (13) für Sichtluft und Feingut besitzen.5. Air classifier according to claim 3 or 4, characterized in that the classifying wheels (7) have a common, centrally located outlet connection (13) for classifying air and fine material. 6. Windsichter nach Anspruch 2, dadurch gekennzeichnet , daß die Rotationsachsen (8) der Sichträder (7) parallel zueinander verlaufen und daß jeweils benachbarte Sichträder um mindestens die Sichtradhöhe gegeneinander versetzt angeordnet sind.6. Air classifier according to claim 2, characterized in that the axes of rotation (8) of the classifying wheels (7) run parallel to one another and that in each case neighboring classifying wheels are arranged offset from one another by at least the classifying wheel height. 7. Windsichter nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet , daß die Sichträder (7) eine Vielzahl schmaler, radial oder schräg zum Sichtradumfang verlaufender Schaufeln (9) aufweisen.7. Air classifier according to one of claims 1 to 6, characterized in that the classifying wheels (7) have a plurality of narrow blades (9) which extend radially or obliquely to the classifying wheel circumference. 8. Windsichter nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet , daß zur Einstellung und Konstanthaltung einer für alle Sichträder (7) gleichen, durch die geforderte Trenngrenze bestimmten Drehzahl eine gemeinsame-Steuereinrichtung vorgesehen ist.8. Air classifier according to one of claims 1 to 7, characterized in that a common control device is provided for setting and maintaining a constant for all classifying wheels (7), determined by the required separation limit.
EP83113017A 1983-01-29 1983-12-23 Pneumatic separator in the field of fine material Expired EP0115057B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83113017T ATE27556T1 (en) 1983-01-29 1983-12-23 WINDSIFTER FOR THE FINEST AREA.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3303078A DE3303078C1 (en) 1983-01-29 1983-01-29 Air classifier for the fine area
DE3303078 1983-01-29

Publications (3)

Publication Number Publication Date
EP0115057A2 true EP0115057A2 (en) 1984-08-08
EP0115057A3 EP0115057A3 (en) 1985-10-30
EP0115057B1 EP0115057B1 (en) 1987-06-03

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EP83113017A Expired EP0115057B1 (en) 1983-01-29 1983-12-23 Pneumatic separator in the field of fine material

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US (1) US4528091A (en)
EP (1) EP0115057B1 (en)
JP (1) JPS59142877A (en)
AT (1) ATE27556T1 (en)
DE (1) DE3303078C1 (en)

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EP0209663A1 (en) * 1985-06-14 1987-01-28 Krupp Polysius Ag Process and device for comminuting material
EP0244744A2 (en) * 1986-05-07 1987-11-11 OMYA GmbH Centrifugal sifter
EP0638365A2 (en) * 1993-08-07 1995-02-15 Hosokawa Alpine Aktiengesellschaft Method and device for separating fine-grained solids into two grain size fractions
US5667075A (en) * 1995-04-07 1997-09-16 Hosokawa Alpine Aktiengesellschaft Classifying wheel for centrifugal-wheel classifiers
DE10151325A1 (en) * 2001-10-17 2003-05-08 Wester Tonbergbau Kg Wind separator unit for sorting particles of high hardness into fine and coarse constituents comprises a rotating separator wheel with inclined bores which serve as passages for fine constituents and air
EP1398086A1 (en) * 2002-09-12 2004-03-17 Ehinger Impianti S.r.l. Particle classifier

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DE3508889C1 (en) * 1985-03-13 1992-02-20 Alpine Ag, 8900 Augsburg Air classifier with wear-free classifying wheel
DE3515026C1 (en) * 1985-04-25 1986-09-18 Fa. Christian Pfeiffer, 4720 Beckum Rotary air centrifuge classifier
DE3521638C2 (en) * 1985-06-15 1994-03-31 Kloeckner Humboldt Deutz Ag Scattering classifier for classifying fine-grained material
DE3621221A1 (en) * 1986-06-25 1988-01-14 Pfeiffer Fa Christian METHOD FOR WINDPROOFING AND WINIFIFIER
DD257212A1 (en) * 1987-01-22 1988-06-08 Dessau Zementanlagenbau Veb WINDSICHTER FOR THE SEALING OF SCHUETTGUETERN FINE CORE
US4793917A (en) * 1987-04-15 1988-12-27 Institut Khimii Tverdogo Tela I Pererabotki Mineralnogo Syrya Sibirskogo Otdelenia Akademii Nauk Ussr Centrifugal classifier for superfine powders
DE3838871C2 (en) * 1988-01-22 1994-10-27 Nied Roland Air classifier
DE3814458A1 (en) * 1988-04-28 1989-11-09 Krupp Polysius Ag Air separator
EP0369399B1 (en) * 1988-11-17 1994-08-10 Roland Dr.-Ing. Nied Wind sifter
DE58900995D1 (en) * 1988-12-27 1992-04-23 Roland Nied METHOD FOR FINE SIGHTING AND DEVICE FOR IMPLEMENTING THE METHOD.
DE4140656C1 (en) * 1991-12-10 1992-09-10 Alpine Ag, 8900 Augsburg, De
NO300257B1 (en) * 1995-04-07 1997-05-05 Sinvent As Apparatus for sorting particulate material
DE102005001542B4 (en) * 2005-01-13 2009-06-10 Lehigh Technologies, LLC, Naples Multi-wheel air classifier, separate classifying wheel unit and separate classifier unit
DE102006048850A1 (en) * 2006-10-16 2008-04-17 Evonik Degussa Gmbh Amorphous submicron particles
DE102006048865A1 (en) * 2006-10-16 2008-04-17 Roland Dr. Nied Process for the production of finest particles and jet mill therefor and air classifier and operating method thereof
DE102006048864A1 (en) * 2006-10-16 2008-04-17 Roland Dr. Nied Process for the production of finest particles and jet mill therefor and air classifier and operating method thereof
DE102013002237B3 (en) * 2013-02-11 2014-05-22 Microtec Gmbh Classifier
DE202015009079U1 (en) 2015-08-27 2016-10-07 Josef Fischer Kryogenmahlvorrichtung
EP3135380B1 (en) 2015-08-27 2017-10-11 Josef Fischer Cryogenic grinding device and method

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0209663A1 (en) * 1985-06-14 1987-01-28 Krupp Polysius Ag Process and device for comminuting material
EP0244744A2 (en) * 1986-05-07 1987-11-11 OMYA GmbH Centrifugal sifter
EP0244744A3 (en) * 1986-05-07 1989-05-17 Omya Gmbh Centrifugal sifter
EP0638365A2 (en) * 1993-08-07 1995-02-15 Hosokawa Alpine Aktiengesellschaft Method and device for separating fine-grained solids into two grain size fractions
EP0638365A3 (en) * 1993-08-07 1995-09-13 Hosokawa Alpine Ag Method and device for separating fine-grained solids into two grain size fractions.
US5894935A (en) * 1993-08-07 1999-04-20 Hosokawa Alpine Aktiengesellschaft Method and device to separate a fine-grained solid material into two fractions
US5667075A (en) * 1995-04-07 1997-09-16 Hosokawa Alpine Aktiengesellschaft Classifying wheel for centrifugal-wheel classifiers
DE10151325A1 (en) * 2001-10-17 2003-05-08 Wester Tonbergbau Kg Wind separator unit for sorting particles of high hardness into fine and coarse constituents comprises a rotating separator wheel with inclined bores which serve as passages for fine constituents and air
DE10151325B4 (en) * 2001-10-17 2006-07-27 Wester Tonbergbau Kg air classifier
EP1398086A1 (en) * 2002-09-12 2004-03-17 Ehinger Impianti S.r.l. Particle classifier

Also Published As

Publication number Publication date
US4528091A (en) 1985-07-09
DE3303078C1 (en) 1984-05-30
ATE27556T1 (en) 1987-06-15
EP0115057A3 (en) 1985-10-30
JPS59142877A (en) 1984-08-16
JPS6349548B2 (en) 1988-10-05
EP0115057B1 (en) 1987-06-03

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