EP1951446B1 - Safety device for sieving granular material - Google Patents

Safety device for sieving granular material Download PDF

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Publication number
EP1951446B1
EP1951446B1 EP06828951A EP06828951A EP1951446B1 EP 1951446 B1 EP1951446 B1 EP 1951446B1 EP 06828951 A EP06828951 A EP 06828951A EP 06828951 A EP06828951 A EP 06828951A EP 1951446 B1 EP1951446 B1 EP 1951446B1
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EP
European Patent Office
Prior art keywords
screening
housing
separator
fine material
screening device
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Not-in-force
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EP06828951A
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German (de)
French (fr)
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EP1951446A1 (en
Inventor
Siegfried Strasser
Albert Süssegger
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KHD Humboldt Wedag AG
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KHD Humboldt Wedag AG
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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
    • 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
    • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
    • B07B9/02—Combinations of similar or different apparatus for separating solids from solids using gas currents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
    • B04C2009/007—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks with internal rotors, e.g. impeller, ventilator, fan, blower, pump

Definitions

  • the invention relates to a sifting device for sifting granular material, with at least one arranged in the sifter housing rod basket with distributed over the rotor circumference turbo elements arranged and with inlets and outlets for sight gas, reformgut, coarse material and fines, wherein at least one of the end faces of the rotatable rod basket in the classifier housing, the outlet opening is arranged for the withdrawal of the view gas laden with the fine material.
  • the fine material is conveyed by the air flow against the centrifugal force of the two rods of the staff basket inside and leaves together with the convey Kunststoff the classifier, while the coarse material passes through the centrifugal force to the outer edge of the classifier housing and there by gravity is discharged downward from the viewing zone.
  • the invention has for its object to further develop a sifter for sifting granular material with at least one rotatable rod basket and a downstream fine material so that space and specific energy consumption for the operation of the overall device can be saved.
  • a dip tube is arranged for the withdrawal of the freed from the fine sight gas flow, while at least one opening for discharging the separated from the classifying air flow fine material is arranged at the periphery of the Wirbelabscheidergeophuses.
  • the fine-material discharge opening may be arranged approximately at the point at which the inlet for the classifying air carrying the visible goods is located in a conventional cyclone separator.
  • the axis of rotation of the bar basket as well as approximately aligned with the central axis of the cyclone vortex separator substantially horizontally be arranged horizontally.
  • the said axes can also be arranged vertically. If the fines discharge opening is arranged in the lowest area of the vortex separator housing, the fines can advantageously be discharged by gravity.
  • the immersion tube which is arranged in the vortex separator, can have through-openings distributed around the dip tube circumference in its end region facing the rotatable rod cage for the low-loss withdrawal of the classifying air.
  • This dip tube end region like the vortex separator housing, can be conically tapered in the direction of the rotatable rod cage.
  • the drawing shows in vertical section a rod basket sifter with directly attached cyclone vortex separator.
  • a classifier housing 10 At least one rod cage 11 with turbo elements 12 arranged distributed over the rotor circumference is rotatable stored, and flying on an approximately horizontally lying shaft 13 which is driven by a motor 14.
  • the rod basket 11 with its turbo elements 12 may be formed instead of cylindrical and conical or frustoconical.
  • a frusto-conical displacement body 15 In the interior of the bar cage 11, a frusto-conical displacement body 15 may be arranged.
  • the grainy good to be seen, the z. B. comes from an airflow mill, is suspended in a classifying air stream 16 introduced into the classifier housing 10, where it is accelerated to the peripheral speed of the rotating rod basket 11.
  • the fine material contained in the feed material is conveyed inward against the centrifugal force between the rods 12 of the rod basket 11 and leaves together with the classifying air centrally the rod basket in the embodiment to the right side, while the coarse material 17 by the centrifugal force to the outer edge of the classifier 10 is pushed and there discharged from the classifier zone by gravity downward through discharge opening 18 from the classifier housing 10.
  • the outlet opening 19 is arranged in the classifier housing 10 for the withdrawal of the view gas laden with the fine material flow 20, which flows out with considerable swirl energy.
  • a cyclone-like Wirbelabscheider 21 with the smaller diameter of its housing cone 22 is grown directly from the appearance, so that the rod basket sifter 10, 11 and the separator 21 form a compact unit.
  • a dip tube 23 is arranged for the withdrawal of the freed from fines prepare for fines from fines prepare for fine.
  • exhaust air 24 can be at least recirculated to the fan housing 23 of the vortex separator 21 in connection fan as circulating air in the classifier housing 10.
  • dip tube 23 in its the rotatable rod basket 11 facing end portion distributed around the dip tube circumference window-like z. B. slot-shaped passage openings 27 for the passage of the classifying air 24 have.
  • the cylindrical dip tube 23 may be conically tapered in its end towards the rotatable rod basket 11, wherein the dip tube 23 may be closed at its end by a closure 28, so that the swirl impingement 20 of the classifying air is forced to flow through the window-like openings 27 into the dip tube 23.
  • a static cascade classifier can be connected in front of the sifter cage 11 in the area of the cascade classifier so that the classifier housing 10 in the region of the cascade classifier is then discharged for coarse material and in the area of the rod basket sifter portion 11 the discharge 18 for the medium 17 and the swirl separator housing 21 are assigned for the fines 26.
  • Such a static cascade classifier has two digestzonenbegrenzungscolour enclosed by the classifier housing and forming between them a visual zone and by the classifying air or hot gas as drying gas about in cross-flow, the obliquely downwards have inclined cascaded or louvered arranged baffles, said two baffle walls and the intermediate viewing zone are arranged at an angle deviating from the vertical angle.
  • Such a static cascade classifier is well suited Gutagglomerate contained in withdraw such.
  • B. slips a Gutbettzerklein mecanics roller press or high-pressure roller mill to dissolve or disagglomerate.
  • a non-rotating, but stationary vane ring can be arranged around the rotating rod basket 11 around.
  • a plurality of cyclonic vortex separators 21 of the same design can be distributed around the circumference of the reformergeophuseö réelle 19 through which exits the fine material and spin-laden reformgasströmung 20, wherein the tangential component of the sortgasströmung 20 in the connection between the classifier housing 10 and the entry into the plurality Vortex separator 21 is maintained.

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  • Combined Means For Separation Of Solids (AREA)
  • Cyclones (AREA)
  • Road Signs Or Road Markings (AREA)
  • Toys (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Crushing And Grinding (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)

Abstract

In a screening device for sorting granular material with at least one rotatable rod basket and a downstream fine material separator a cyclone-type eddy separator is attached with the smaller diameter of its housing cone in order to draw off the screening gas flow charged with fine material and flowing out due to twisting energy in such a way that the rod basket screening device and the separator form a compact unit. A submerged pipe is located in the center of the cyclone-type eddy separator for drawing off the screening gas flow freed of fine material. At least one opening is provided for discharging the fine material at the periphery of the eddy separator housing.

Description

Die Erfindung betrifft eine Sichtereinrichtung zum Sichten von körnigem Gut, mit wenigstens einem im Sichtergehäuse rotierbar angeordneten Stabkorb mit über den Rotorumfang verteilt angeordneten Turboelementen und mit Ein- und Auslässen für Sichtgas, Sichtgut, Grobgut und Feingut, wobei an wenigstens einer der Stirnseiten des rotierbaren Stabkorbs im Sichtergehäuse die Auslassöffnung zum Abzug des mit dem Feingut beladenen Sichtgasstromes angeordnet ist.The invention relates to a sifting device for sifting granular material, with at least one arranged in the sifter housing rod basket with distributed over the rotor circumference turbo elements arranged and with inlets and outlets for sight gas, Sichtgut, coarse material and fines, wherein at least one of the end faces of the rotatable rod basket in the classifier housing, the outlet opening is arranged for the withdrawal of the view gas laden with the fine material.

Bekannt sind derartige dynamische Sichter, auch Stabkorbsichter genannt, bei denen das Sichtgut in der Sichtzone durch den rotierenden Stabkorb auf die Umfangsgeschwindigkeit des Stabkorbes beschleunigt wird und durch das Zusammenwirken der auf die Sichtgutteilchen wirkenden Fliehkraft (Zentrifugalkraft) und der Reibungskraft der Luftströmung eine Auftrennung des Sichtgutes in ein Grobgut und in ein Feingut herbeigeführt wird, z. B. Publikation " KHD Symposium '92" Band 1, 1993, der KHD Humboldt Wedag AG, Aufsatz von A. Süßegger Sichter-Report '92 Seite 63ff , insbesondere Seite 65 Bild 1. Dabei wird das Feingut durch die Luftströmung entgegen der Fliehkraft zweischen die Stäbe des Stabkorbes nach innen gefördert und verlässt gemeinsam mit der Sichtluft den Sichter, während das Grobgut durch die Fliehkraft zum äußeren Rand des Sichtergehäuses gelangt und dort durch Schwerkraft nach unten aus der Sichtzone ausgetragen wird.Are known such dynamic classifiers, also called Stabkorbsichter, in which the Sichtgut is accelerated in the viewing zone by the rotating rod basket to the peripheral speed of the Stabkorbes and by the interaction of the centrifugal force acting on the Sichtgutteilchen (centrifugal force) and the friction force of the air flow separation of the visual material into a coarse material and a fine material is brought about, for. B. Publication " KHD Symposium '92 "volume 1, 1993, the KHD Humboldt Wedag AG, essay by A. Süßegger Sichter-Report '92 page 63ff , in particular page 65 Figure 1. Here, the fine material is conveyed by the air flow against the centrifugal force of the two rods of the staff basket inside and leaves together with the Sichtluft the classifier, while the coarse material passes through the centrifugal force to the outer edge of the classifier housing and there by gravity is discharged downward from the viewing zone.

Bei den bekannten dynamischen Stabkorbsichtern wird der mit dem Feingut beladene Sichtluftstrom nach Verlassen des Sichters über eine mehr oder weniger lange Rohrleitung zu einem Abscheider wie z. B. Zyklon zur Abtrennung des Feinguts von der Sichtluft geleitet, wozu entsprechender Platz benötigt wird. Hinzu kommt, dass die Verbindungsrohrleitung zwischen Stabkorbsichter und nachgeschaltetem Feingutabscheider einen spürbaren Druckverlust verursacht. Dies alles gilt prinzipiell auch dann, wenn die Verbindungsrohrleitung zwischen dem Stabkorbsichter und einem nachgeschalteten Zyklonabscheider verhältnismäßig kurz ist, wie bei der bekannten Sichtereinrichtung der DE-A 102 21 739 der Fall.In the known dynamic rod sifter the loaded with the fines view air stream after leaving the classifier over a more or less long pipe to a separator such. B. cyclone directed to the separation of the fine material from the classifying air, what appropriate space is needed. In addition, the connecting pipe between Stabkorbsichter and downstream fine material causes a noticeable pressure loss. All this applies in principle even if the connecting pipe between the rod basket separator and a downstream cyclone separator is relatively short, as in the known separator device of DE-A 102 21 739 the case.

Der Erfindung liegt die Aufgabe zugrunde, eine Sichtereinrichtung zum Sichten von körnigem Gut mit wenigstens einem rotierbaren Stabkorb und einem nachgeschalteten Feingutabscheider so weiter zu entwickeln, dass Platz und spezifischer Energiebedarf zum Betrieb der Gesamteinrichtung eingespart werden.The invention has for its object to further develop a sifter for sifting granular material with at least one rotatable rod basket and a downstream fine material so that space and specific energy consumption for the operation of the overall device can be saved.

Diese Aufgabe wird gemäß der Erfindung mit einer Sichtereinrichtung mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.This object is achieved according to the invention with a classifying device with the features of claim 1. Advantageous embodiments of the invention are specified in the subclaims.

Durch das Merkmal der Erfindung, bei der Sichtereinrichtung mit rotierbarem Stabkorb an der Sichtergehäuseöffnung zum Abzug des mit Drallenergie ausströmenden mit dem Feingut beladenen Sichtgasstromes unmittelbar einen vom Aussehen zyklonartigen Wirbelabscheider mit dem kleineren Durchmesser seines Gehäusekonusses anzubauen und aus dem Stabkorbsichter und dem nachgeschalteten Feingutabscheider eine kompakte Baueinheit zu bilden, ohne die üblich gewesenen Verbindungsrohrleitungen einzusetzen, werden Material- und Raumbedarf der Gesamteinrichtung eingespart. Ferner ergibt sich daraus eine deutliche Reduzierung des spezifischen Energiebedarfs für die Gesamteinrichtung, und zwar in erster Linie durch den Wegfall des durch die Rohrleitungen sonst verursachten Strömungswiderstandes bzw. Druckverlustes für die Sichtluft, der sonst durch ein Mehr an elektrischer Antriebsleistung für das nachgeschaltete Saugzuggebläse bzw. für den Ventilator kompensiert werden muss. Hinzu kommt ein Wegfall der Beschleunigungsverluste für die Sichtluft und das Feingut, die ein einem Stabkorbsichter nachgeschalteter Abscheidezyklon herkömmlicher Bauweise zwangsweise im Einlauf verursacht. Die Einsparung an spezifischem Energiebedarf resultiert besonders dadurch, dass bei der erfindungsgemäßen Sichtereinrichtung die Drallenergie des aus dem Stabkorb ausströmenden mit dem Feingut beladenen Sichtgasstromes für den Feingut-Abscheidevorgang im unmittelbar angebauten zyklonartigen Wirbelabscheider genutzt wird, so dass der zyklonartige Wirbelabscheider einen tangentialen Strömungseinlauf nicht benötigt.By the feature of the invention, in the sifter with rotatable rod basket on the Sichtergehäuseöffnung to extract the swirling energy flowing with the fines laden sight gas stream directly grow a cyclone-like vortex separator with the smaller diameter of its housing cone and from the rod basket sifter and the downstream fine material a compact unit To form, without using the usual compound pipes, material and space requirements of the entire device can be saved. Furthermore, this results in a significant reduction of the specific energy requirement for the overall device, primarily by the elimination of the otherwise caused by the pipes flow resistance or pressure loss for the classifying air, which otherwise has to be compensated by a more electrical drive power for the downstream induced draft fan or for the fan. In addition, there is a loss of acceleration losses for the classifying air and the fine material, which caused a Stabkorbsichter downstream separation cyclone conventional design forcibly in the inlet. The saving in specific energy requirement results in particular from the fact that in the classifying device according to the invention the swirl energy of the stream of visible gas flowing out of the rod basket is used for the fine material deposition in the directly attached cyclone-type vortex separator, so that the cyclone-like vortex separator does not require a tangential flow inlet.

Vielmehr tritt die Strömung in den angebauten zyklonartigen Wirbelabscheider der erfindungsgemäßen Einrichtung an der Stelle ein, an der sich bei einem konventionellen Zyklonabscheider die Konusspitze mit dem Grobgutaustrag befindet. Im Zentrum des zyklonartigen Wirbelabscheiders ist ein Tauchrohr zum Abzug des vom Feingut befreiten Sichtgasstromes angeordnet, während an der Peripherie des Wirbelabscheidergehäuses wenigstens eine Öffnung zum Austrag des vom Sichtluftstrom abgetrennten Feinguts angeordnet ist. So kann beim zyklonartigen Wirbelabscheider die Feingutaustragsöffnung etwa an der Stelle angeordnet sein, an dem sich bei einem konventionellen Zyklonabscheider der Einlass für die das Sichtgut tragende Sichtluft befindet.Rather, the flow enters the attached cyclone vortex separator of the device according to the invention at the point at which the Konusspitze with the coarse material discharge is in a conventional cyclone. In the center of the cyclonic vortex separator, a dip tube is arranged for the withdrawal of the freed from the fine sight gas flow, while at least one opening for discharging the separated from the classifying air flow fine material is arranged at the periphery of the Wirbelabscheidergehäuses. Thus, in the cyclone-type vortex separator, the fine-material discharge opening may be arranged approximately at the point at which the inlet for the classifying air carrying the visible goods is located in a conventional cyclone separator.

Nach einem weiteren Merkmal der Erfindung können die Drehachse des Stabkorbs sowie dazu etwa fluchtend angeordnet die Zentralachse des zyklonartigen Wirbelabscheiders im wesentlichen horizontal liegend angeordnet sein. Die genannten Achsen können aber auch vertikal angeordnet sein. Wenn die Feingut-Austragsöffnung im untersten Bereich des Wirbelabscheidergehäuses angeordnet wird, kann das Feingut mit Vorteil einfach per Schwerkraft ausgetragen werden.According to a further feature of the invention, the axis of rotation of the bar basket as well as approximately aligned with the central axis of the cyclone vortex separator substantially horizontally be arranged horizontally. The said axes can also be arranged vertically. If the fines discharge opening is arranged in the lowest area of the vortex separator housing, the fines can advantageously be discharged by gravity.

Nach einem weiteren Merkmal der Erfindung besteht aber auch die Möglichkeit, dass das an der Peripherie des Wirbelabscheidergehäuses gesammelte Feingut suspendiert in einem Sichtgasteilstrom von einem eigenen Ventilator abgezogen wird, wobei das Tauchrohr des Wirbelabscheiders zum Abzug des restlichen Sichtgasteilstromes zu einem anderen eigenen Ventilator und Staubfilter geführt ist. Die Abluft wenigstens des mit dem Tauchrohr des Wirbelabscheiders in Verbindung stehenden Ventilators kann als Umluft in das Sichtergehäuse rezirkuliert werden.According to a further feature of the invention, however, there is also the possibility that the collected at the periphery of the Wirbelabscheidergehäuses fine suspended in a Sichtgasteilstrom is deducted from its own fan, wherein the dip tube of Wirbelabscheiders led to subtract the remaining Sichtgasteilstromes to another own fan and dust filter is. The exhaust air of at least the fan connected to the immersion tube of the vortex separator can be recirculated as circulating air into the separator housing.

Das im Wirbelabscheider angeordnete Tauchrohr kann in seinem dem rotierbaren Stabkorb zugewandten Endbereich um den Tauchrohrumfang verteilte Durchgangsöffnungen zum strömungsverlustarmen Abzug der Sichtluft aufweisen. Dieser Tauchrohrendbereich kann, genauso wie das Wirbelabscheidergehäuse, in Richtung zum rotierbaren Stabkorb hin konisch verjüngt sein.The immersion tube, which is arranged in the vortex separator, can have through-openings distributed around the dip tube circumference in its end region facing the rotatable rod cage for the low-loss withdrawal of the classifying air. This dip tube end region, like the vortex separator housing, can be conically tapered in the direction of the rotatable rod cage.

Die Erfindung und deren weitere Merkmale und Vorteile werden anhand des in der Zeichnung schematisch dargestellten Ausführungsbeispieles näher erläutert.The invention and its further features and advantages will be explained in more detail with reference to the embodiment schematically illustrated in the drawing.

Die Zeichnung zeigt im Vertikalschnitt einen Stabkorbsichter mit unmittelbar angebautem zyklonartigen Wirbelabscheider.The drawing shows in vertical section a rod basket sifter with directly attached cyclone vortex separator.

In einem Sichtergehäuse 10 ist wenigstens ein Stabkorb 11 mit über den Rotorumfang verteilt angeordneten Turboelementen 12 drehbar gelagert, und zwar fliegend an einer etwa horizontal liegenden Welle 13, die von einem Motor 14 antreibbar ist. Der Stabkorb 11 mit seinen Turboelementen 12 kann statt zylindrisch auch konisch bzw. kegelmantelstumpfförmig ausgebildet sein. Im inneren des Stabkorbs 11 kann ein kegelstumpfförmiger Verdrängungskörper 15 angeordnet sein. Das zu sichtende körnige Gut, das z. B. von einer Luftstrommühle kommt, wird suspendiert in einem Sichtluftstrom 16 in das Sichtergehäuse 10 eingeführt, wo es auf die Umfangsgeschwindigkeit des rotierenden Stabkorbs 11 beschleunigt wird. Das im Aufgabegut enthaltene Feingut wird durch die Luftströmung entgegen der Fliehkraft zwischen die Stäbe 12 des Stabkorbs 11 nach innen gefördert und verlässt gemeinsam mit der Sichtluft zentral den Stabkorb im Ausführungsbeispiel zur rechten Seite hin, während das Grobgut 17 durch die Fliehkraft zum äußeren Rand des Sichtergehäuses 10 abgedrängt wird und dort aus der Sichtzone durch Schwerkrafteinwirkung nach unten durch Austragsöffnung 18 aus dem Sichtergehäuse 10 ausgetragen wird.In a classifier housing 10, at least one rod cage 11 with turbo elements 12 arranged distributed over the rotor circumference is rotatable stored, and flying on an approximately horizontally lying shaft 13 which is driven by a motor 14. The rod basket 11 with its turbo elements 12 may be formed instead of cylindrical and conical or frustoconical. In the interior of the bar cage 11, a frusto-conical displacement body 15 may be arranged. The grainy good to be seen, the z. B. comes from an airflow mill, is suspended in a classifying air stream 16 introduced into the classifier housing 10, where it is accelerated to the peripheral speed of the rotating rod basket 11. The fine material contained in the feed material is conveyed inward against the centrifugal force between the rods 12 of the rod basket 11 and leaves together with the classifying air centrally the rod basket in the embodiment to the right side, while the coarse material 17 by the centrifugal force to the outer edge of the classifier 10 is pushed and there discharged from the classifier zone by gravity downward through discharge opening 18 from the classifier housing 10.

An der rechten Stirnseite des rotierenden Stabkorbs 11 ist im Sichtergehäuse 10 die Auslassöffnung 19 zum Abzug des mit dem Feingut beladenen Sichtgasstromes 20 angeordnet, der mit erheblicher Drallenergie ausströmt. An dieser Sichtergehäuseöffnung 19 ist unmittelbar ein vom Aussehen zyklonartiger Wirbelabscheider 21 mit dem kleineren Durchmesser seines Gehäusekonusses 22 angebaut, so dass der Stabkorbsichter 10, 11 und der Abscheider 21 eine kompakte Baueinheit bilden. Im Zentrum des zyklonartigen Wirbelabscheiders 21 ist ein Tauchrohr 23 zum Abzug des vom Feingut befreiten Sichtluftstroms 24 angeordnet, der von einem nicht dargestellten Saugzuggebläse bzw. Ventilator angesaugt wird. An der Peripherie des Wirbelabscheidergehäuses 21, im Ausführungsbeispiel in dessen unterstem Bereich ist eine Öffnung 25 zum Austrag des Feinguts 26 per Schwerkrafteinwirkung angeordnet. Es besteht aber auch die Möglichkeit, dass das an der Peripherie des Wirbelabscheidergehäuses 21 gesammelte Feingut suspendiert in einem Sichtgasteilstrom von einem eigenen nicht dargestellten Ventilator abgezogen wird, der ein anderer Ventilator ist als derjenige, der den Sichtluftstrom 24 abzieht.At the right end side of the rotating rod basket 11, the outlet opening 19 is arranged in the classifier housing 10 for the withdrawal of the view gas laden with the fine material flow 20, which flows out with considerable swirl energy. At this Sichtergehäuseöffnung 19 a cyclone-like Wirbelabscheider 21 with the smaller diameter of its housing cone 22 is grown directly from the appearance, so that the rod basket sifter 10, 11 and the separator 21 form a compact unit. In the center of the cyclone-like vortex separator 21, a dip tube 23 is arranged for the withdrawal of the freed from fines Sichtluftstroms 24, which is sucked in by an induced draft fan or fan, not shown. At the periphery of the Wirbelabscheidergehäuses 21, in the embodiment in the lowermost region of an opening 25 for discharging the fine material 26 by gravity is arranged. But there is also the Possibility that the collected at the periphery of the Wirbelabscheidergehäuses 21 suspended suspended in a Sichtgasteilstrom of its own fan, not shown, which is a different fan than the one which subtracts the classifying air stream 24.

Es versteht sich, dass die Abluft 24 wenigstens des mit dem Tauchrohr 23 des Wirbelabscheiders 21 in Verbindung stehenden Ventilators als Umluft in das Sichtergehäuse 10 rezirkuliert werden kann.It is understood that the exhaust air 24 can be at least recirculated to the fan housing 23 of the vortex separator 21 in connection fan as circulating air in the classifier housing 10.

Wie aus der Zeichnung noch hervorgeht, kann das im Wirbelabscheider 21 angeordnet Tauchrohr 23 in seinem dem rotierbaren Stabkorb 11 zugewandten Endbereich um den Tauchrohrumfang verteilte fensterartige z. B. schlitzförmige Durchgangsöffnungen 27 zum Durchtritt der Sichtluft 24 aufweisen. Ferner geht aus der Zeichnung noch hervor, dass das zylindrische Tauchrohr 23 in seinem Endbereich in Richtung zum rotierbaren Stabkorb 11 hin konisch verjüngt sein kann, wobei das Tauchrohr 23 an seinem Ende durch einen Verschluss 28 verschlossen sein kann, so dass die Drallströrnung 20 der Sichtluft gezwungen ist, durch die fensterartigen Öffnungen 27 hindurch in das Tauchrohr 23 einzuströmen.As can be seen from the drawing, arranged in the vortex separator 21 dip tube 23 in its the rotatable rod basket 11 facing end portion distributed around the dip tube circumference window-like z. B. slot-shaped passage openings 27 for the passage of the classifying air 24 have. Furthermore, it is apparent from the drawing that the cylindrical dip tube 23 may be conically tapered in its end towards the rotatable rod basket 11, wherein the dip tube 23 may be closed at its end by a closure 28, so that the swirl impingement 20 of the classifying air is forced to flow through the window-like openings 27 into the dip tube 23.

Im Sichtergehäuse 10 kann dem wenigstens einen Stabkorb 11 sichtluftströmungsseitig ein statischer Kaskadensichter vorgeschaltet sein, so dass dann dem Sichtergehäuse 10 im Bereich des Kaskadensichters ein Austrag für Grobgut und im Bereich des Stabkorbsichterteils 11 der Austrag 18 dann für das Mittelgut 17 und dem Wirbelabscheidergehäuse 21 der Austrag für das Feingut 26 zugeordnet sind. Ein solcher statischer Kaskadensichter weist zwei vom Sichtergehäuse umschlossene und zwischen sich eine Sichtzone bildende sowie von der Sichtluft bzw. von Heißgas als Trocknungsgas etwa im Querstrom durchströmte Sichtzonenbegrenzungswände auf, die schräg nach unten geneigte kaskadenartig bzw. jalousieartig angeordnete Leitbleche aufweisen, wobei diese beiden Leitblechwände und die dazwischen liegende Sichtzone mit einem von der Vertikalen abweichenden Winkel schräg liegend angeordnet sind. Ein solcher statischer Kaskadensichter ist gut geeignet, im Sichtgut enthaltene Gutagglomerate wie z. B. Pressschülpen einer Gutbettzerkleinerungs-Rollenpresse bzw. Hochdruck-Walzenmühle aufzulösen bzw. zu desagglomerieren.In the classifier housing 10, a static cascade classifier can be connected in front of the sifter cage 11 in the area of the cascade classifier so that the classifier housing 10 in the region of the cascade classifier is then discharged for coarse material and in the area of the rod basket sifter portion 11 the discharge 18 for the medium 17 and the swirl separator housing 21 are assigned for the fines 26. Such a static cascade classifier has two Sichtzonenbegrenzungswände enclosed by the classifier housing and forming between them a visual zone and by the classifying air or hot gas as drying gas about in cross-flow, the obliquely downwards have inclined cascaded or louvered arranged baffles, said two baffle walls and the intermediate viewing zone are arranged at an angle deviating from the vertical angle. Such a static cascade classifier is well suited Gutagglomerate contained in Sichtgut such. B. slips a Gutbettzerkleinerungs roller press or high-pressure roller mill to dissolve or disagglomerate.

Im Sichtergehäuse 10 kann um den rotierenden Stabkorb 11 herum ein nicht rotierender, sondern feststehender Leitschaufelkranz angeordnet sein.In the sifter housing 10, a non-rotating, but stationary vane ring can be arranged around the rotating rod basket 11 around.

Erfindungsgemäß können auch mehrere zyklonartige Wirbelabscheider 21 gleicher Bauart um den Umfang der Sichtergehäuseöffnung 19 verteilt angeordnet sein, durch welche die mit Feingut und Drall beladene Sichtgasströmung 20 austritt, wobei die Tangentialkomponente der Sichtgasströmung 20 in der Verbindung zwischen dem Sichtergehäuse 10 und dem Eintritt in die mehreren Wirbelabscheider 21 erhalten bleibt.According to the invention, a plurality of cyclonic vortex separators 21 of the same design can be distributed around the circumference of the Sichtergehäuseöffnung 19 through which exits the fine material and spin-laden Sichtgasströmung 20, wherein the tangential component of the Sichtgasströmung 20 in the connection between the classifier housing 10 and the entry into the plurality Vortex separator 21 is maintained.

Claims (8)

  1. Screening device for sorting granular material with at least one with at least one rotatable rod basket (11) located in the screening housing (10) with turbo elements (12) distributed across the circumference of the rotor and with inlets and outlets for screening gas (16), material to be screened, coarse material (17) and fine material, whereby the outlet opening for the drawing-off of the screening gas flow (20) charged with the fine material is located at at least one of the narrow ends of the rotatable rod basket (11) in the screening housing (10),
    characterised by the following properties:
    a. At the screening housing opening (19) for drawing off the screening gas flow charged with fine material (20), a cyclone-type eddy separator (21) is attached with the smaller diameter of its housing cone (22), so that the rod basket screening device (10, 11) and the separator (21) form a compact unit,
    b. In the centre of the cycione-type eddy separator (21) there is a submerged pipe (23) for drawing off the screening gas flow (24) freed from the fine material,
    c. At there periphery of the eddy separator housing (21) there is at least one opening (25) for discharging the fine material (26).
  2. Screening device according to claim 1,
    characterised by the rotating axis (13) of the rod basket (11) and the central axis of the cyclone-type eddy separator (21) aligned to it being able to be set up mainly horizontally.
  3. Screening device according to claim 1,
    characterised by the discharge opening for the fine material (25) being situated in the lowest section of the eddy separator housing (21) and the fine material (26) being discharged by means of gravitational force.
  4. Screening device according to claim 1,
    characterised by the fine material (26) collected at the periphery of the eddy separator housing (21) and suspended in a screening gas partial flow is drawn off by a separate fan, whereby the submerged pipe (23) of the eddy separator (21) leads to its own fan and dust filter for drawing off the residual screening gas partial flow.
  5. Screening device according to claim 4,
    characterised by the exhaust air (24) at least of the fan connected to the submerged pipe (23) of the eddy separator (21) being able to be recirculated as ambient air in the screening housing (10).
  6. Screening device according to claim 1,
    characterised by the submerged pipe (23) arranged in the eddy separator (21) having through openings (27) distributed around the circumference of the submerged pipe in the end section facing the rotatable rod basket (11).
  7. Screening device according to claims 1 or 6,
    characterised by the cylindrical submerged pipe (23) in the eddy separator (21) facing the rotatable rod basket (11) being tapered conically.
  8. Screening device according to claims 1 to 7,
    characterised by the a static cascade screening device at least being included on the screening air flow side in the screening housing (10), so that discharge is near the cascade screening device in the screening housing (10) for coarse material, near the rod basket screening section (11) for medium-sized material (17) and near the eddy separator housing (21) for fine material (26).
EP06828951A 2005-11-10 2006-11-08 Safety device for sieving granular material Not-in-force EP1951446B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005053617A DE102005053617A1 (en) 2005-11-10 2005-11-10 Classifying device for sifting granular material
PCT/EP2006/010670 WO2007054270A1 (en) 2005-11-10 2006-11-08 Safety device for sieving granular material

Publications (2)

Publication Number Publication Date
EP1951446A1 EP1951446A1 (en) 2008-08-06
EP1951446B1 true EP1951446B1 (en) 2011-01-05

Family

ID=37649275

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06828951A Not-in-force EP1951446B1 (en) 2005-11-10 2006-11-08 Safety device for sieving granular material

Country Status (9)

Country Link
US (1) US8083070B2 (en)
EP (1) EP1951446B1 (en)
CN (1) CN101291747A (en)
AT (1) ATE494079T1 (en)
DE (2) DE102005053617A1 (en)
DK (1) DK1951446T3 (en)
EA (1) EA200800425A1 (en)
TW (1) TW200734071A (en)
WO (1) WO2007054270A1 (en)

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JP2010227924A (en) * 2009-03-03 2010-10-14 Ricoh Co Ltd Classifier and classifying method
TWI400153B (en) * 2010-03-25 2013-07-01 Yolinew Technology Co Ltd Auto disconnecting component machine
CN102744135B (en) * 2012-07-20 2014-07-23 北京建筑大学 Airflow screening grinder
DE102014001384B4 (en) * 2014-02-01 2018-03-29 Khd Humboldt Wedag Gmbh Ring-shaped cascade classifier with downstream rod basket sifter
DE102014010045A1 (en) 2014-06-27 2015-12-31 Khd Humboldt Wedag Gmbh Classifier with vanes with guiding elements
CN105080838B (en) * 2015-08-11 2018-03-27 上海友助机械有限公司 A kind of aerosol particle thing particle diameter screening installation
CN107520112B (en) * 2017-09-30 2024-05-28 无锡科安自动化装备有限公司 Granular food screening device

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Also Published As

Publication number Publication date
DK1951446T3 (en) 2011-05-02
DE502006008680D1 (en) 2011-02-17
ATE494079T1 (en) 2011-01-15
US20080290002A1 (en) 2008-11-27
EP1951446A1 (en) 2008-08-06
EA200800425A1 (en) 2008-10-30
CN101291747A (en) 2008-10-22
US8083070B2 (en) 2011-12-27
WO2007054270A1 (en) 2007-05-18
DE102005053617A1 (en) 2007-06-14
TW200734071A (en) 2007-09-16

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