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EP0374491A2 - Sifter - Google Patents

Sifter Download PDF

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Publication number
EP0374491A2
EP0374491A2 EP89121348A EP89121348A EP0374491A2 EP 0374491 A2 EP0374491 A2 EP 0374491A2 EP 89121348 A EP89121348 A EP 89121348A EP 89121348 A EP89121348 A EP 89121348A EP 0374491 A2 EP0374491 A2 EP 0374491A2
Authority
EP
European Patent Office
Prior art keywords
classifier
rotor
distributor
crop
mill
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
EP89121348A
Other languages
German (de)
French (fr)
Other versions
EP0374491B1 (en
EP0374491A3 (en
Inventor
Michael Dr.-Ing. Von Seebach
Norbert Dipl.-Ing. Patzelt
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
Original Assignee
Krupp Polysius AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Krupp Polysius AG filed Critical Krupp Polysius AG
Publication of EP0374491A2 publication Critical patent/EP0374491A2/en
Publication of EP0374491A3 publication Critical patent/EP0374491A3/en
Application granted granted Critical
Publication of EP0374491B1 publication Critical patent/EP0374491B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/20—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
    • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
    • B02C13/1807—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate
    • B02C13/1835—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate by means of beater or impeller elements fixed in between an upper and lower rotor disc
    • B02C13/1842—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate by means of beater or impeller elements fixed in between an upper and lower rotor disc with dead bed protected beater or impeller elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material
    • B02C21/002—Disintegrating plant with or without drying of the material using a combination of a roller mill and a drum mill
    • B02C21/005—Disintegrating plant with or without drying of the material using a combination of a roller mill and a drum mill the roller mill having cooperating rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
    • 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
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
    • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
    • B02C13/1807—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate
    • B02C2013/1885—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate of dead bed type

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 EP-A-0 221 246.
  • the material distributor designed as a plate is located directly on the top of the rotor and can be rotated together with the rotor.
  • the invention has for its object to design a classifier according to the preamble of claim 1 so that it can be used advantageously in grinding plants equipped with a material bed roller mill, in which the regrind discharged from the material bed roller mill often has a high proportion Contains fines.
  • the crop distributor is driven independently of the rotor by means of a separate drive device.
  • the speed of the crop distributor can be selected so that there is an optimal deagglomeration of the slugs.
  • the material distributor is designed in accordance with the invention in such a way that the dissolution of the material and the uniform spreading into the viewing space is promoted.
  • the classifier 1 illustrated in FIGS. 1-3 contains a driven rotor 2 with a vertical axis, which has blades 3 arranged on its circumference at a distance from one another.
  • the rotor 2 is surrounded by a fixed guide device 4, which contains adjustable guide vanes and via which a visible air flow supplied by means of an inlet spiral 5 enters the viewing space 6 between the guide device 4 and the rotor 2.
  • the rotor 2 is driven from below by a drive motor (not shown) via a shaft 8 which is mounted above the rotor 2 in a bearing 10 carried by radial webs 9.
  • a coarse material hopper 11 for discharging the coarse material dropping out of the viewing space 6 is located below the rotor 2 and the guide apparatus 4.
  • a channel 12 adjoins the open lower end face of the rotor 2, which is used to discharge the fine air stream loaded with fine material.
  • a crop distributor 13 is arranged at a distance above the rotor 2 and is driven independently of the rotor 2 by a separate drive motor 14 via a belt drive 15 and a hollow shaft 16.
  • the hollow shaft 16 is supported in bearings 17, 18.
  • the crop distributor 13 contains a plate-shaped base plate 19 and an annular cover plate 20. Between the base plate 19 and the cover plate 20 there are a number (for example three) guide webs 21 which are inclined in relation to the radial position in the direction of rotation (arrow 22) of the crop distributor. Holding elements 23, 24 are provided in the region of the ends of the guide webs 21. Support plates 25 support the guide webs 21 from the outside.
  • annular crop inlet opening 26 Between the annular cover plate 20 of the crop distributor 13 and the shaft 16 there is an annular crop inlet opening 26, through which the crop fed, for example by means of a conveyor belt 27 and a feed chute 28, is fed to the crop distributor 13.
  • the crop distributor 13 is surrounded at a radial distance by an annular chamber 29 which is open towards the crop distributor 13 and which represents a baffle and deagglomeration zone for the crop thrown outwards by the crop distributor 13. Since the annular chamber 29 has a bottom 30, a filling 31 is formed in this annular chamber 29, onto which the material thrown off by the material distributor 13 strikes and which thus acts as a ver wear protection works.
  • a good cushion is formed on the guide webs 21 of the material distributor 13 - significantly favored by the jamming effect exerted by the holding elements 23, 24 - onto which the material entering through the material inlet opening 26 into the material distributor 13 and flung outward in the radial direction Impact good particles.
  • the wear on the surfaces coming into contact with the good agglomerates is significantly reduced.
  • the material to be sifted (preferably the material to be discharged from a material bed roller mill) is fed to the material distributor 13, thrown by it into the annular chamber 29 and optimally dissolved and homogenized in this impact and deagglomeration zone.
  • the material distributor 13 thrown by it into the annular chamber 29 and optimally dissolved and homogenized in this impact and deagglomeration zone.
  • the largely dissolved and homogenized material falls into the viewing space 6 between the guide device 4 and the rotor 2.
  • the coarse material falls out of the viewing space 6 downwards and is discharged via the coarse material funnel 11
  • the speeds (and, if necessary, the direction of rotation) of rotor 2 and crop distributor 13 can be selected differently, so that both the deagglomeration and the sighting can be optimally adjusted to match the crop.
  • feed chutes 28 can be arranged.
  • screws can also be provided for feeding the ground material.
  • FIGS. 1-3 contains a feed hopper 33, a material bed roller mill 34, a circulation bucket elevator 35, a classifier 1 (corresponding to FIGS. 1-3) which is also designed as a deagglomerator, a separator 36 and a circulating air fan 37.
  • the coarse material discharged via the coarse material hopper 11 of the classifier 1 is returned in the grinding system according to FIG. 4 via a return 38 to the inlet shaft 39 of the material bed roller mill 34.
  • the fine material separated from the classifying air flow in the separator 36 forms the finished product (line 40).
  • the grinding system according to FIG. 4 thus shows the diagram of a purely circular grinding with a material bed roller mill 34. Since the scraps discharged from the roller mill 34 take place in the material distributor of the classifier 1, a separate disagglomeration device is unnecessary; at the same time, the funding path is shortened.
  • a fine mill preferably designed as a tube mill 41, is provided, which is the coarse material discharged via the coarse material hopper 11 of the classifier 1 is fed well.
  • the common discharge of the tube mill 41 and the separator 36 forms the finished product (line 42).
  • returns 43, 44 indicated by dashed lines are also provided, via which - alternatively or additionally - material discharged from the material bed roller mill 34 (return 43) and / or material discharged via the coarse material hopper 11 of the classifier 1 (return 44) can be returned to the inlet shaft 39 of the material bed roller mill 34.
  • FIG. 5 thus shows a grinding plant with pre-grinding in the material bed roller mill 34 and fine grinding in the continuous tube mill 41, alternatively with semolina and / or Scheller return to the material bed roller mill.
  • the disagglomeration of the slugs in classifier 1 significantly simplifies the system and significantly reduces operating costs.
  • the grinding system illustrated in FIG. 6 contains the same elements as the system according to FIG. 5. As with the grinding system according to FIG. 4, all of the coarse material discharged via the coarse material hopper 11 of the classifier 1 is returned to the material bed roller mill 34, while that in the separator 36 separated material is still subjected to regrinding in the tube mill 41.
  • a circulation bucket elevator 45 is provided, which returns the discharge of the tube mill 41 to the feed chute 28 of the classifier 1, so that it together with the discharge material Material bed roller mill 34 reaches the material distributor 13 of the classifier 1.
  • the finished product is withdrawn from separator 36 (line 46).
  • FIG. 8 finally shows a grinding plant which, in addition to the plant parts illustrated in FIG. 5, also contains a circulation bucket elevator 45, a further classifier 47 and a separator 48.
  • the sifter 47 is - in contrast to the sifter 1 - designed in the usual way, i. H. provided with a single drive motor through which the rotor and a suitably designed spreading disc are driven.
  • the ground material discharged from the tube mill 41 is fed to the sifter 47 via the circulation bucket elevator 45.
  • the coarse material separated in the sifter 47 is again fed (together with the discharge material from the separator 36) to the tube mill 41, while the fine material discharged from the sifter 47 forms the finished product after separation in the separator 48.
  • FIG. 9 shows a variant of the supply of goods to the distributor 13, which is particularly suitable for larger versions.
  • the supply of goods takes place here through the correspondingly large shaft 16, via which the crop distributor is driven by the drive motor 14.
  • the material thus reaches the material distributor 13 centrally and is thrown outwards by the latter in the manner already explained and is deagglomerated in the annular chamber 29.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Combined Means For Separation Of Solids (AREA)

Abstract

Die Erfindung betrifft einen Sichter mit einem Rotor und einem Gutverteiler, die gesondert angetrieben sind. Ein derartiger Sichter eignet sich besonders für Mahlanlagen, die mit einer Gutbett-Walzenmühle ausgerüstet sind. Die aus einer solchen Walzenmühle ausgetragenen Schülpen können in dem zugleich als Desagglomerator wirkenden Sichter auf einfache Weise aufgelöst werden.The invention relates to a classifier with a rotor and a crop distributor, which are driven separately. Such a classifier is particularly suitable for grinding plants which are equipped with a material bed roller mill. The scraps discharged from such a roller mill can be easily dissolved in the classifier, which also acts as a deagglomerator.

Description

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

Ein Sichter gemäß dem Oberbegriff des Anspruches 1 ist beispielsweise durch die EP-A-0 221 246 bekannt. Der als Teller ausgebildete Gutverteiler be­findet sich bei diesem bekannten Sichter unmittelbar auf der Oberseite des Rotors und ist gemeinsam mit dem Rotor drehbar.A classifier according to the preamble of claim 1 is known for example from EP-A-0 221 246. In this known classifier, the material distributor designed as a plate is located directly on the top of the rotor and can be rotated together with the rotor.

Der Erfindung liegt die Aufgabe zugrunde, einen Sich­ter entsprechend dem Oberbegriff des Anpruches 1 so auszubilden, daß er vorteilhaft in mit einer Gutbett-­Walzenmühle ausgerüsteten Mahlanlagen Verwendung fin­den kann, in denen das aus der Gutbett-Walzenmühle ausgetragene Mahlgut (Schülpen) vielfach einen hohen Anteil Feingut enthält.The invention has for its object to design a classifier according to the preamble of claim 1 so that it can be used advantageously in grinding plants equipped with a material bed roller mill, in which the regrind discharged from the material bed roller mill often has a high proportion Contains fines.

Diese Aufgabe wird erfindungsgemäß durch das kenn­zeichnende Merkmal des Anspruches 1 gelöst. Zweckmäßi­ge Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.This object is achieved by the characterizing feature of claim 1. Appropriate embodiments of the invention are the subject of the dependent claims.

Bei dem erfindungsgemäßen Sichter ist der Gutverteiler unabhängig vom Rotor mittels einer gesonderten An­triebseinrichtung angetrieben. Die Drehzahl des Gut­verteilers kann infolgedessen so gewählt werden, daß sich eine optimale Desagglomeration der Schülpen er­gibt. In konstruktiver Hinsicht wird der Gutverteiler erfindungsgemäß so ausgebildet, daß die Auflösung des Gutes und die gleichmäßige Einstreuung in den Sicht­raum begünstigt wird.In the classifier according to the invention, the crop distributor is driven independently of the rotor by means of a separate drive device. As a result, the speed of the crop distributor can be selected so that there is an optimal deagglomeration of the slugs. In terms of design, the material distributor is designed in accordance with the invention in such a way that the dissolution of the material and the uniform spreading into the viewing space is promoted.

Die Erfindung wird im folgenden anhand der Zeichnungen im einzelnen erläutert. Es zeigen

  • Fig. 1 einen Vertikalschnitt durch ein Aus­führungsbeispiel des erfindungsgemäßen Sichters,
  • Fig. 2 einen horizontalen Teilschnitt durch den Gutverteiler,
  • Fig. 3 einen Vertikal-Teilschnitt durch den Gutverteiler und den ihn umgebenden Ringraum,
  • Fig. 4 bis 8 Schemadarstellungen von Mahlanlagen mit dem erfindungsgemäßen Sichter,
  • Fig. 9 eine Variante des Sichters (Detail­darstellung).
The invention is described below with reference to the drawings explained in detail. Show it
  • 1 is a vertical section through an embodiment of the classifier according to the invention,
  • 2 shows a horizontal partial section through the crop distributor,
  • 3 is a partial vertical section through the material distributor and the annular space surrounding it;
  • 4 to 8 are schematic representations of grinding plants with the classifier according to the invention,
  • Fig. 9 shows a variant of the classifier (detailed view).

Der in den Fig. 1 - 3 veranschaulichte Sichter 1 ent­hält einen angetriebenen Rotor 2 mit vertikaler Achse, der an seinem Umfang mit Abstand voneinander angeord­nete Blätter 3 aufweist.The classifier 1 illustrated in FIGS. 1-3 contains a driven rotor 2 with a vertical axis, which has blades 3 arranged on its circumference at a distance from one another.

Der Rotor 2 wird von einem feststehenden Leitapparat 4 umgeben, der einstellbare Leitschaufeln enthält und über den ein mittels einer Eintrittsspirale 5 zuge­führter Sichtluftstrom in den Sichtraum 6 zwischen Leitapparat 4 und Rotor 2 eintritt.The rotor 2 is surrounded by a fixed guide device 4, which contains adjustable guide vanes and via which a visible air flow supplied by means of an inlet spiral 5 enters the viewing space 6 between the guide device 4 and the rotor 2.

Der Rotor 2 wird von unten her durch einen (nicht dar­gestellten) Antriebsmotor über eine Welle 8 angetrieben, die oberhalb des Rotors 2 in einem von radialen Stegen 9 getragenen Lager 10 gelagert ist.The rotor 2 is driven from below by a drive motor (not shown) via a shaft 8 which is mounted above the rotor 2 in a bearing 10 carried by radial webs 9.

Unterhalb von Rotor 2 und Leitapparat 4 befindet sich ein Grobguttrichter 11 zur Abführung des aus dem Sichtraum 6 ausfallenden Grobgutes.A coarse material hopper 11 for discharging the coarse material dropping out of the viewing space 6 is located below the rotor 2 and the guide apparatus 4.

An die offene untere Stirnseite des Rotors 2 schließt sich ein Kanal 12 an, der zur Abführung des mit Fein­gut beladenen Sichtluftstromes dient.A channel 12 adjoins the open lower end face of the rotor 2, which is used to discharge the fine air stream loaded with fine material.

Mit Abstand oberhalb des Rotors 2 ist ein Gutverteiler 13 angeordnet, der unabhängig vom Rotor 2 durch einen gesonderten Antriebsmotor 14 über einen Riementrieb 15 und eine Hohlwelle 16 angetrieben ist. Die Hohlwelle 16 ist in Lagern 17, 18 gelagert.A crop distributor 13 is arranged at a distance above the rotor 2 and is driven independently of the rotor 2 by a separate drive motor 14 via a belt drive 15 and a hollow shaft 16. The hollow shaft 16 is supported in bearings 17, 18.

Der Gutverteiler 13 enthält eine tellerförmige Grund­platte 19 sowie eine ringförmige Deckplatte 20. Zwi­schen der Grundplatte 19 und der Deckplatte 20 sind eine Anzahl (beispielsweise drei) Führungsstege 21 angeordnet, die gegenüber der radialen Lage in Dreh­richtung (Pfeil 22) des Gutverteilers geneigt sind. Im Bereich der Enden der Führungsstege 21 sind Halte­elemente 23, 24 vorgesehen. Stützbleche 25 stützen die Führungsstege 21 nach außen ab.The crop distributor 13 contains a plate-shaped base plate 19 and an annular cover plate 20. Between the base plate 19 and the cover plate 20 there are a number (for example three) guide webs 21 which are inclined in relation to the radial position in the direction of rotation (arrow 22) of the crop distributor. Holding elements 23, 24 are provided in the region of the ends of the guide webs 21. Support plates 25 support the guide webs 21 from the outside.

Zwischen der ringförmigen Deckplatte 20 des Gutvertei­lers 13 und der Welle 16 ist eine ringförmige Gutein­trittsöffnung 26 vorhanden, über die das beispiels­weise mittels eines Förderbandes 27 und eine Aufgabe­schurre 28 zugeführte Gut dem Gutverteiler 13 aufge­geben wird.Between the annular cover plate 20 of the crop distributor 13 and the shaft 16 there is an annular crop inlet opening 26, through which the crop fed, for example by means of a conveyor belt 27 and a feed chute 28, is fed to the crop distributor 13.

Der Gutverteiler 13 wird mit radialem Abstand von einer Ringkammer 29 umgeben, die zum Gutverteiler 13 hin offen ist und die eine Prall- und Desagglomera­tionszone für das vom Gutverteiler 13 nach außen ge­worfene Gut darstellt. Da die Ringkammer 29 einen Boden 30 aufweist, bildet sich in dieser Ringkammer 29 eine Gutschüttung 31 aus, auf die das vom Gutverteiler 13 abgeworfene Gut auftrifft und die somit als Ver­ schleißschutz wirkt.The crop distributor 13 is surrounded at a radial distance by an annular chamber 29 which is open towards the crop distributor 13 and which represents a baffle and deagglomeration zone for the crop thrown outwards by the crop distributor 13. Since the annular chamber 29 has a bottom 30, a filling 31 is formed in this annular chamber 29, onto which the material thrown off by the material distributor 13 strikes and which thus acts as a ver wear protection works.

In ähnlicher Weise bildet sich auch an den Führungs­stegen 21 des Gutverteilers 13 - wesentlich begünstigt durch die von den Halteelementen 23, 24 ausgeübte Stauwirkung - ein Gutpolster aus, auf das die durch die Guteintrittsöffnung 26 in den Gutverteiler 13 eintretenden und in radialer Richtung nach außen ge­schleuderten Gutpartikel auftreffen. Auf diese Weise wird der Verschleiß an den mit den Gutagglomeraten in Berührung kommenden Flächen wesentlich verringert.In a similar manner, a good cushion is formed on the guide webs 21 of the material distributor 13 - significantly favored by the jamming effect exerted by the holding elements 23, 24 - onto which the material entering through the material inlet opening 26 into the material distributor 13 and flung outward in the radial direction Impact good particles. In this way, the wear on the surfaces coming into contact with the good agglomerates is significantly reduced.

Zusammengefaßt ist die Funktion des Sichters gemäß den Fig. 1 - 3 wie folgt:The function of the classifier according to FIGS. 1-3 is summarized as follows:

Das zu sichtende Gut (vorzugsweise das Austragsgut einer Gutbett-Walzenmühle) wird dem Gutverteiler 13 aufgegeben, von diesem in die Ringkammer 29 geschleu­dert und in dieser Prall- und Desagglomerationszone optimal aufgelöst und vergleichmäßigt. Durch den Spalt 32 zwischen der Ringkammer 30 und dem Gutverteiler 13 fällt das weitgehend aufgelöste und vergleichmäßigte Gut in den Sichtraum 6 zwischen Leitapparat 4 und Rotor 2. Während das Grobgut aus dem Sichtraum 6 nach unten ausfällt und über den Grobguttrichter 11 abge­führt wird, wird das Feingut vom Sichtluftstrom durch den Rotor 2 mitgenommen und verläßt den Sichter über den unterhalb des Rotors 2 angeschlossenen Kanal 12.The material to be sifted (preferably the material to be discharged from a material bed roller mill) is fed to the material distributor 13, thrown by it into the annular chamber 29 and optimally dissolved and homogenized in this impact and deagglomeration zone. Through the gap 32 between the annular chamber 30 and the material distributor 13, the largely dissolved and homogenized material falls into the viewing space 6 between the guide device 4 and the rotor 2. While the coarse material falls out of the viewing space 6 downwards and is discharged via the coarse material funnel 11, Fine material entrained in the air flow through the rotor 2 and leaves the classifier via the channel 12 connected below the rotor 2.

Die Drehzahlen (und im Bedarfsfalle auch die Dreh­richtung) von Rotor 2 und Gutverteiler 13 können un­terschiedlich gewählt werden, so daß in Anpassung an das jeweilige Gut sowohl die Desagglomeration, als auch die Sichtung optimal eingestellt werden können.The speeds (and, if necessary, the direction of rotation) of rotor 2 and crop distributor 13 can be selected differently, so that both the deagglomeration and the sighting can be optimally adjusted to match the crop.

Abweichend von dem in Fig. 1 dargestellten Ausführungs­ beispiel können im Bedarfsfalle mehrere Aufgabeschur­ren 28 (vorzugsweise gleichmäßig über den Umfang ver­teilt) angeordnet werden. Statt eines Förderbandes 27 mit nachgeschalteter Aufgabeschurre 28 können bei­spielsweise auch Schnecken zur Zuführung des Mahlgutes vorgesehen werden.Deviating from the embodiment shown in FIG. 1 For example, if necessary, several feed chutes 28 (preferably evenly distributed over the circumference) can be arranged. Instead of a conveyor belt 27 with a downstream feed chute 28, for example, screws can also be provided for feeding the ground material.

Die Fig. 4 - 8 veranschaulichen einige Ausführungs­beispiele von Mahlanlagen mit dem erfindungsgemäßen Sichter.4-8 illustrate some embodiments of grinding plants with the classifier according to the invention.

Die Mahlanlage gemäß Fig. 4 enthält einen Aufgabebun­ker 33, eine Gutbett-Walzenmühle 34, ein Umlaufbecher­werk 35, einen zugleich als Desagglomerator ausgebil­deten Sichter 1 (entsprechend den Fig. 1 - 3), einen Abscheider 36 sowie einen Umluftventilator 37.4 contains a feed hopper 33, a material bed roller mill 34, a circulation bucket elevator 35, a classifier 1 (corresponding to FIGS. 1-3) which is also designed as a deagglomerator, a separator 36 and a circulating air fan 37.

Das über den Grobguttrichter 11 des Sichters 1 ausge­tragene Grobgut wird bei der Mahlanlage gemäß Fig. 4 über eine Rückführung 38 zum Einlaufschacht 39 der Gutbett-Walzenmühle 34 zurückgeführt. Das im Abschei­der 36 aus dem Sichtluftstrom abgeschiedene Feingut bildet das Fertiggut (Leitung 40). Die Mahlanlage gemäß Fig. 4 zeigt somit das Schema einer reinen Um­laufmahlung mit einer Gutbett-Walzenmühle 34. Da die Auflösung der aus der Walzenmühle 34 ausgetragenen Schülpen im Gutverteiler des Sichters 1 erfolgt, er­übrigt sich eine gesonderte Desagglomerier-Einrich­tung; zugleich verkürzt sich der Förderweg.The coarse material discharged via the coarse material hopper 11 of the classifier 1 is returned in the grinding system according to FIG. 4 via a return 38 to the inlet shaft 39 of the material bed roller mill 34. The fine material separated from the classifying air flow in the separator 36 forms the finished product (line 40). The grinding system according to FIG. 4 thus shows the diagram of a purely circular grinding with a material bed roller mill 34. Since the scraps discharged from the roller mill 34 take place in the material distributor of the classifier 1, a separate disagglomeration device is unnecessary; at the same time, the funding path is shortened.

Bei dem Ausführungsbeispiel gemäß Fig. 5 ist zusätz­lich zu den bereits anhand Fig. 4 erläuterten Elemen­ten der Mahlanlage eine vorzugsweise als Rohrmühle 41 ausgebildete Feinmühle vorgesehen, der das über den Grobguttrichter 11 des Sichters 1 ausgetragene Grob­ gut zugeführt wird. Der gemeinsame Austrag der Rohr­mühle 41 und des Abscheiders 36 bildet das Fertiggut (Leitung 42).In the exemplary embodiment according to FIG. 5, in addition to the elements of the grinding system already explained with reference to FIG. 4, a fine mill, preferably designed as a tube mill 41, is provided, which is the coarse material discharged via the coarse material hopper 11 of the classifier 1 is fed well. The common discharge of the tube mill 41 and the separator 36 forms the finished product (line 42).

Es sind weiterhin in Fig. 5 gestrichelt angedeutete Rückführungen 43, 44 vorgesehen, über die - alterna­tiv oder zusätzlich - aus der Gutbett-Walzenmühle 34 ausgetragenes Gut (Rückführung 43) und/oder über den Grobguttrichter 11 des Sichters 1 ausgetragenes Gut (Rückführung 44) zum Einlaufschacht 39 der Gutbett-­Walzenmühle 34 zurückgeleitet werden kann.In FIG. 5, returns 43, 44 indicated by dashed lines are also provided, via which - alternatively or additionally - material discharged from the material bed roller mill 34 (return 43) and / or material discharged via the coarse material hopper 11 of the classifier 1 (return 44) can be returned to the inlet shaft 39 of the material bed roller mill 34.

Fig. 5 zeigt damit eine Mahlanlage mit Vormahlung in der Gutbett-Walzenmühle 34 und Feinmahlung in der Durchlauf-Rohrmühle 41, und zwar alternativ mit Grieß- und/oder Schülpenrückführung zur Gutbett-Walzenmühle. Auch hier ergibt die im Sichter 1 erfolgende Desagglo­meration der Schülpen eine wesentliche Vereinfachung der Anlage und eine deutliche Senkung der Betriebs­kosten.FIG. 5 thus shows a grinding plant with pre-grinding in the material bed roller mill 34 and fine grinding in the continuous tube mill 41, alternatively with semolina and / or Schülpen return to the material bed roller mill. Here, too, the disagglomeration of the slugs in classifier 1 significantly simplifies the system and significantly reduces operating costs.

Die in Fig. 6 veranschaulichte Mahlanlage enthält die gleichen Elemente wie die Anlage gemäß Fig. 5. Wie bei der Mahlanlage gemäß Fig. 4 wird das gesamte über den Grobguttrichter 11 des Sichters 1 ausgetragene Grobgut zur Gutbett-Walzenmühle 34 zurückgeführt, während das im Abscheider 36 abgeschiedene Gut noch einer Nachmah­lung in der Rohrmühle 41 unterzogen wird.The grinding system illustrated in FIG. 6 contains the same elements as the system according to FIG. 5. As with the grinding system according to FIG. 4, all of the coarse material discharged via the coarse material hopper 11 of the classifier 1 is returned to the material bed roller mill 34, while that in the separator 36 separated material is still subjected to regrinding in the tube mill 41.

Die Mahlanlage gemäß Fig. 7 enthält die gleichen Ele­mente wie die Anlagen entsprechend den Fig. 5 und 6. Zusätzlich ist ein Umlaufbecherwerk 45 vorgesehen, das den Austrag der Rohrmühle 41 zur Aufgabeschurre 28 des Sichters 1 zurückführt, so daß es gemeinsam mit dem Austragsgut der Gutbett-Walzenmühle 34 auf den Gutver­teiler 13 des Sichters 1 gelangt. Das Fertiggut wird vom Abscheider 36 abgezogen (Leitung 46).7 contains the same elements as the plants according to FIGS. 5 and 6. In addition, a circulation bucket elevator 45 is provided, which returns the discharge of the tube mill 41 to the feed chute 28 of the classifier 1, so that it together with the discharge material Material bed roller mill 34 reaches the material distributor 13 of the classifier 1. The finished product is withdrawn from separator 36 (line 46).

In Übereinstimmung mit dem Ausführungsbeispiel gemäß Fig. 5 sind alternativ oder zusätzlich verwendbare Rückführungen 43 und 44 vorgesehen, über die Austrags­gut der Gutbett-Walzenmühle 34 bzw. Grobgut des Sich­ters 1 zur Walzenmühle 34 zurückgeführt wird.5, alternatively or additionally usable returns 43 and 44 are provided, via which material to be discharged from the material bed roller mill 34 or coarse material from the classifier 1 is returned to the roller mill 34.

Fig. 8 zeigt schließlich eine Mahlanlage, die außer den in Fig. 5 veranschaulichten Anlagenteilen noch ein Umlaufbecherwerk 45, einen weiteren Sichter 47 und einen Abscheider 48 enthält. Der Sichter 47 ist hierbei - anders als der Sichter 1 - in üblicher Weise ausgebildet, d. h. mit einem einzigen Antriebs­motor versehen, durch den der Antrieb des Rotors und eines geeignet gestalteten Streutellers erfolgt.FIG. 8 finally shows a grinding plant which, in addition to the plant parts illustrated in FIG. 5, also contains a circulation bucket elevator 45, a further classifier 47 and a separator 48. The sifter 47 is - in contrast to the sifter 1 - designed in the usual way, i. H. provided with a single drive motor through which the rotor and a suitably designed spreading disc are driven.

Das aus der Rohrmühle 41 ausgetragene Mahlgut wird über das Umlaufbecherwerk 45 dem Sichter 47 zugeführt. Das im Sichter 47 abgeschiedene Grobgut wird (zusam­men mit dem Austragsgut des Abscheiders 36) erneut der Rohrmühle 41 zugeleitet, während das aus dem Sichter 47 ausgetragene Feingut nach Abscheidung im Abschei­der 48 das Fertiggut bildet. Bei der Mahlanlage gemäß Fig. 8 erfolgt somit eine Umlaufmahlung mit der Gut­bett-Walzenmühle 34 (Grobumlauf) und eine Feinmahlung mit der Rohrmühle 41 (Feinumlauf).The ground material discharged from the tube mill 41 is fed to the sifter 47 via the circulation bucket elevator 45. The coarse material separated in the sifter 47 is again fed (together with the discharge material from the separator 36) to the tube mill 41, while the fine material discharged from the sifter 47 forms the finished product after separation in the separator 48. In the grinding system according to FIG. 8, there is thus a continuous grinding with the material bed roller mill 34 (coarse circulation) and a fine grinding with the tube mill 41 (fine circulation).

Fig. 9 zeigt eine Variante der Gutaufgabe auf den Gutverteiler 13, die insbesondere für größere Aus­führungen geeignet ist. Die Gutzufuhr erfolgt hierbei durch die entsprechend groß dimensionierte Welle 16, über die der Gutverteiler vom Antriebsmotor 14 ange­trieben wird. Das Gut gelangt damit zentral auf den Gutverteiler 13 und wird von diesem in der bereits er­läuterten Weise nach außen geschleudert und in der Ringkammer 29 desagglomeriert.FIG. 9 shows a variant of the supply of goods to the distributor 13, which is particularly suitable for larger versions. The supply of goods takes place here through the correspondingly large shaft 16, via which the crop distributor is driven by the drive motor 14. The material thus reaches the material distributor 13 centrally and is thrown outwards by the latter in the manner already explained and is deagglomerated in the annular chamber 29.

Claims (11)

1. Sichter, enthaltend
a) einen angetriebenen Rotor (2) mit vertikaler Achse, der an seinem Umfang mit Abstand vonein­ander angeordnete Blätter (3) aufweist,
b) einen oberhalb des Rotors (2) angeordneten dreh­baren Gutverteiler (13),
c) eine Einrichtung zur Aufgabe von zu sichtendem Gut auf den Gutverteiler (13),
d) einen den Rotor (2) mit Abstand umgebenden fest­stehenden Leitapparat (4) mit einstellbaren Leitschaufeln, wobei das vom Gutverteiler (13) abgeworfene Gut in einen zwischen dem Leitappa­rat (4) und dem Rotor (2) gebildeten Sichtraum (6) gelangt, der von einem durch den Leitapparat zugeführten und durch den Rotor abgeführten Sichtluftstrom durchsetzt wird,
e) einen an eine Stirnseite des Rotors (2) an­schließenden Kanal (12) zur Abführung des mit Feingut beladenen Sichtluftstromes,
f) einen unterhalb von Rotor (2) und Leitapparat (4) angeordneten Grobguttrichter (11) zur Ab­führung des Grobgutes,
gekennzeichnet durch folgendes Merkmal:
g) der Gutverteiler (13) ist unabhängig vom Rotor (2) mittels einer gesonderten Antriebseinrich­ tung angetrieben.1. Sifter containing
a) a driven rotor (2) with a vertical axis, which has blades (3) spaced apart on its circumference,
b) a rotatable crop distributor (13) arranged above the rotor (2),
c) a device for feeding good to be sifted onto the good distributor (13),
d) a fixed guide device (4) with adjustable guide vanes surrounding the rotor (2) at a distance, the good thrown off by the material distributor (13) entering a visual space (6) formed between the guide device (4) and the rotor (2), which is traversed by a sifting air flow fed through the guide apparatus and discharged through the rotor,
e) a channel (12) adjoining an end face of the rotor (2) for discharging the fine air laden with fine material,
f) a coarse material hopper (11) arranged below the rotor (2) and guide apparatus (4) for removing the coarse material,
characterized by the following feature:
g) the crop distributor (13) is independent of the rotor (2) by means of a separate drive unit tion driven. 2. Sichter nach Anspruch 1, dadurch gekennzeichnet, daß der Gutverteiler (13) folgende Elemente ent­hält: a) eine tellerförmige Grundplatte (19), b) eine Anzahl von auf der Grundplatte angeordneten Führungsstegen (21), die gegenüber der radialen Lage in Drehrichtung des Gutverteilers geneigt sind, c) Halteelemente (23, 24) zum Aufbau eines Gutpol­sters auf den Führungsstegen (21). 2. Sifter according to claim 1, characterized in that the crop distributor (13) contains the following elements: a) a plate-shaped base plate (19), b) a number of guide webs (21) arranged on the base plate, which are inclined with respect to the radial position in the direction of rotation of the crop distributor, c) holding elements (23, 24) for building up a good cushion on the guide webs (21). 3. Sichter nach Anspruch 2, dadurch gekennzeichnet, daß der Gutverteiler (13) eine ringförmige Deck­platte (20) aufweist, wobei zwischen dieser Deck­platte (20) und der Antriebswelle (16) des Gutver­teilers (13) eine ringförmige Guteintrittsöffnung (26) vorgesehen ist.3. Sifter according to claim 2, characterized in that the crop distributor (13) has an annular cover plate (20), an annular crop entry opening (26) being provided between this cover plate (20) and the drive shaft (16) of the crop distributor (13) . 4. Sichter nach Anspruch 1, dadurch gekennzeichnet, daß der Gutverteiler (13) mit radialem Abstand von einer zum Gutverteiler hin offenen Ringkammer (29) umgeben ist, die eine Prall- und Desagglomerations­zone darstellt und in der sich eine als Verschleiß­schutz wirkende Gutschüttung (31) ausbildet.4. Sifter according to claim 1, characterized in that the crop distributor (13) is surrounded at a radial distance from an open to the crop distributor ring chamber (29), which represents a baffle and deagglomeration zone and in which acts as a wear protection bulk material (31 ) trains. 5. Sichter nach Anspruch 1, dadurch gekennzeichnet, daß die Antriebswelle des Gutverteilers (13) als Hohlwelle (16) ausgebildet ist .5. Sifter according to claim 1, characterized in that the drive shaft of the crop distributor (13) is designed as a hollow shaft (16). 6. Mahlanlage, enthaltend
a) eine Gutbett-Walzenmühle (34) mit zwei unter hohem Druck gegeneinander gepreßten Walzen,
b) sowie einen Sichter (1) zur Sichtung des in der Walzenmühle zerkleinerten Gutes,
gekennzeichnet durch einen Sichter gemäß Anspruch 1.6. Grinding plant containing
a) a material bed roller mill (34) with two rollers pressed against one another under high pressure,
b) and a classifier (1) for classifying the comminuted material in the roller mill,
characterized by a classifier according to claim 1. 7. Mahlanlage nach Anspruch 6, dadurch gekennzeichnet, daß eine Rückführung (38) für das über den Grobgut­trichter (11) des Sichters (1) ausgetragene Grob­gut zur Walzenmühle (34) vorgesehen ist.7. Grinding plant according to claim 6, characterized in that a return (38) for the coarse material hopper (11) of the classifier (1) discharged coarse material to the roller mill (34) is provided. 8. Mahlanlage nach Anspruch 6, gekennzeichnet durch folgende Merkmale: a) es ist eine vorzugsweise als Rohrmühle (41) ausgebildete Feinmühle zur Aufnahme von über den Grobguttrichter (11) des Sichters (1) aus­getragenem Grobgut vorgesehen; b) es sind weiterhin alternativ oder zusätzlich verwendbare Rückführungen (43, 44) vorhanden, über die aus der Gutbett-Walzenmühle (34) so­wie über den Grobguttrichter (11) des Sichters (1) ausgetragenes Gut zur Walzenmühle rückführ­bar ist. 8. Grinding plant according to claim 6, characterized by the following features: a) a fine mill, preferably designed as a tube mill (41), is provided for receiving coarse material discharged via the coarse material hopper (11) of the classifier (1); b) there are alternatively or additionally usable returns (43, 44) via which material discharged from the material bed roller mill (34) and via the coarse material hopper (11) of the classifier (1) can be returned to the roller mill. 9. Mahlanlage nach Anspruch 8, gekennzeichnet durch eine weitere Rückführung, über die aus der Fein­mühle ausgetragenes Gut erneut dem Sichter (1) zugeführt wird.9. Grinding plant according to claim 8, characterized by a further return, via which material discharged from the fine mill is fed again to the classifier (1). 10. Mahlanlage nach Anspruch 7, gekennzeichnet durch eine vorzugsweise als Rohrmühle (41) ausgebildete Feinmühle zur Nachmahlung von aus dem Sichter (1) als Feingut ausgetragenem Gut.10. Grinding plant according to claim 7, characterized by a preferably designed as a tube mill (41) fine mill for re-grinding from the classifier (1) discharged as fine material. 11. Mahlanlage nach Anspruch 10, gekennzeichnet durch eine weitere Rückführung, über die aus der Fein­mühle (41) ausgetragenes Gut einem mit Einzelan­trieb versehenen weiteren Sichter (47) zugeführt wird.11. Grinding plant according to claim 10, characterized by a further return, via which material discharged from the fine mill (41) is fed to a separator provided with a separate drive (47).
EP89121348A 1988-12-22 1989-11-17 Sifter Expired - Lifetime EP0374491B1 (en)

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US5024754A (en) 1991-06-18
DE3843338A1 (en) 1990-06-28
EP0374491B1 (en) 1994-02-16
ES2050207T3 (en) 1994-05-16
DE58906996D1 (en) 1994-03-24
EP0374491A3 (en) 1991-12-11

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