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EP0347948A2 - Plural-stage mill - Google Patents

Plural-stage mill Download PDF

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Publication number
EP0347948A2
EP0347948A2 EP89113826A EP89113826A EP0347948A2 EP 0347948 A2 EP0347948 A2 EP 0347948A2 EP 89113826 A EP89113826 A EP 89113826A EP 89113826 A EP89113826 A EP 89113826A EP 0347948 A2 EP0347948 A2 EP 0347948A2
Authority
EP
European Patent Office
Prior art keywords
mill
milling
classifier
rotor
stator
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.)
Withdrawn
Application number
EP89113826A
Other languages
German (de)
French (fr)
Other versions
EP0347948A3 (en
Inventor
Günter Jäckering
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.)
Altenburger Maschinen Jaeckering GmbH
Original Assignee
Altenburger Maschinen Jaeckering GmbH
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 Altenburger Maschinen Jaeckering GmbH filed Critical Altenburger Maschinen Jaeckering GmbH
Publication of EP0347948A2 publication Critical patent/EP0347948A2/en
Publication of EP0347948A3 publication Critical patent/EP0347948A3/en
Withdrawn legal-status Critical Current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
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/28—Passing gas through crushing or disintegrating zone gas moving means being integral with, or attached to, crushing or disintegrating element
    • 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
    • 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
    • B02C13/26—Details
    • B02C13/288—Ventilating, or influencing air circulation
    • 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
    • B02C13/26—Details
    • B02C13/30—Driving mechanisms
    • 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
    • B02C2013/145—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with fast rotating vanes generating vortexes effecting material on material impact

Definitions

  • the invention relates to a mill with a plurality of grinding stages, consisting of an essentially cylindrical stator common to all grinding stages, a rotor equipped with a plurality of grinding plates arranged one above the other in several stages, with a conveying device for a carrier gas which supplies the mill with the regrind interspersed, as well as with a finger sifter in the outlet area of the mill.
  • a mill of this type is known from the publication "Ultra-Rotor” from the company “Altenburger Maschinen".
  • the crushing principle of this mill which works with air as the carrier gas, is based on the fact that the regrind particles within the large number of air vortices generated by the grinding plates are accelerated to a high speed and preferably execute mutual impacts. These mutual impacts break the particles apart. Only a small part of the shredding processes occurs when the regrind particles meet the stationary or rotating machine parts. The fact that the mutual collisions of the particles in the air flow predominate means that the ground material is reduced particularly gently.
  • the finger classifier arranged in the outlet area of the mill is arranged on the shaft of the rotor and thus has a speed corresponding to the rotor.
  • the present invention has for its object to provide a mill of the type mentioned, in which the sifter properties can be changed, without the need for assembly work.
  • this object is achieved in that the finger classifier is equipped with a separate drive. This makes it possible to set the speed - and thus the properties - of the finger sifter independently of the speed of the rotor. Not only the setting of a certain grain size of the grinding result but also an adaptation of the grinding process to the product properties are possible by simply changing the speed of the finger sifter.
  • stator or the stator housing is denoted by 1, the rotor generally by 2, the feed hopper by 3 and the feed screw by 4.
  • the mill is equipped with five superimposed grinding stages 5.
  • Each grinding stage is formed by a plurality of grinding plates 7 fastened on the circumference of a circular disc 6 (e.g. about 50).
  • the grinding plates 7 each extend radially and parallel to the axis of rotation 8 of the rotor.
  • the discs 6 carrying the grinding plates 7 are fastened to the hub sections 9, which in turn are connected to the shaft 11 of the rotor 2.
  • the shaft 11 is supported above and below the rotor 2 in bearings 12, 13.
  • the drive, not shown, is located below the lower bearing 12.
  • the radial impeller 15 is additionally fastened, specifically immediately below the lowest grinding stage 5. Its axial inlet 16 is directed downward and faces a space 17 into which the feed shaft for the ground material with the screw 4 and an air supply duct 18 open . For better guidance of the ground material and the air when it enters the impeller 15 is the one occurs 16 surrounding edge 19 is provided, which extends perpendicular to the plane of the wheel 15 in the direction of the central space 17.
  • a disk 21 is attached to the shaft 11, on the circumference of which the classifier fingers 22 are attached.
  • the classifier fingers 22 there is an essentially circular outlet opening 23, to which the ring channel 24 and the outlet opening 25 connect.
  • the outlet opening 25 is connected either directly or via a separator, not shown, to the fan 26, the motor of which is designated 27.
  • the impeller 15 is shown again. It has a total of eight blades 28 curved to the rear.
  • the ground material and the amount of air required for both transport and grinding enter the space 17 and from there enter the fan wheel 15 axially and centrally.
  • the regrind and the air are set in rotation and conveyed radially outwards. This results in a uniform distribution of the ground material on the inner wall of the stator, which is followed by an equally uniform ascent of the ground material through the grinding stages 5.
  • the impeller 15 has a dissolving effect, that is, given if existing lumps of ground material are broken up.
  • the product and air then pass through the grinding stages 5.
  • Sufficiently finely ground material is able to pass through the rotating classifier fingers with the carrier air.
  • the regrind-air mixture leave the mill 1 and are then separated from one another in the separators (not shown). Grist held back by the classifier fingers leaves the mill through the overflow flap 29 and is returned to the grist inlet.
  • the impeller 15 and the fan 26 effect the conveyance of the carrier gas and thus the conveyance of the ground material.
  • the delivery rate of the fan 15 corresponds to the speed of the rotor 2, so it does not change when the rotor speed is constant. If, according to an advantageous development of the invention, the speed of the motor 27 and thus the power of the fan 26 can be regulated, then the residence time of the product in the area of the grinding stages 5 can be influenced. Also the adaptation of the carrier gas flow conditions required for the transport of a product, which is dependent on many properties of the product to be ground, e.g. depend on its specific weight, is particularly simple with the help of the controllable fan 26.
  • the upper fan 26 is on a high delivery rate to ensure that the heavy product is conveyed safely.
  • the product is moist and the moisture is to be evaporated during the grinding process, it is expedient to throttle the upper fan 26. This increases the residence time of the air-material mixture in the mill, so that the desired drying occurs during the grinding.
  • the drying capacity can be increased further by supplying hot air to the mill 1 via the channel 18.
  • the upper fan must be throttled so that the desired grinding effect can be achieved better.
  • the finger sifter located above the rotor 2 to be equipped with its own drive so that the speed of the finger sifter can be set independently of the speed of the rotor 2.
  • This measure not only makes it possible to influence the grain size of the product, it also allows the grinding process to be adapted to the product properties. If, for example, a specifically light product is to be ground particularly finely and particularly gently, then a strong carrier gas flow and a particularly high speed of rotation of the finger sifter must be used.
  • the strong carrier gas flow keeps the temperature of the ground material low. However, it also has the effect that the material passes through the mill particularly quickly, that is to say it is not ground sufficiently finely.
  • the fast rotating finger classifier therefore does not let the product come out of the mill. It is returned to the mill entrance. During this time, it is subject to a break from grinding, so that it cools down further before it is subjected to the grinding process again.
  • FIG. 3 shows an embodiment for a separate finger classifier drive.
  • a sleeve 31 is assigned to the upper end of the shaft 11 of the mill 1, which is only shown in part, which is rotatably supported on the shaft 11 via the bearings 32, 33. Outside the sleeve 31, another bearing 34 is featured see through which the sleeve 31 is supported in the mill housing. The sleeve 31 is thereby rotatably supported independently of the rotating shaft 11.
  • the lower end of the sleeve 31 protrudes into the mill housing and there carries the disk 21 with the classifier fingers 22. It passes through the wall of the mill housing and is sealed therein with sealing rings, which are not described in detail. Outside the mill, it protrudes so far that it can be coupled to a controllable drive motor 35 by means of belts 36.
  • the fingers 22 usually have a rod-like shape. As a result of their radial arrangement, the gap between the fingers increases in the radial direction. In order to achieve an approximately constant gap width in the radial direction, it is expedient within the scope of the invention to use classifier fingers, the width of which increases in the radial direction. Exemplary embodiments for this are shown in FIGS. 4 and 5. With classifier fingers of this type, an advantageous influence on the action of the classifier, e.g. an equalization of the classifying effect.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Discharge Heating (AREA)

Abstract

A grinding mill containing a plurality of milling sections and composed of: a single cylindrical stator common to all milling sections; a rotor mounted in the stator for rotation about the longitudinal axis of the stator and having a plurality of milling plates spaced apart along the longitudinal axis and each disposed in a respective milling section; and a blower facility fastened to the rotor for rotation therewith and disposed near the bottom of the stator below the lowermost milling section for conveying material to be ground and conveyor gas through a central opening in the bottom of the stator to the milling sections. An auxiliary flow inducing device is connected to the outlet of the mill. The mill further includes a finger sifter mounted adjacent the outlet end of the milling sections and rotated at a rate selected independently of the rate of rotation of the rotor. Each milling plate can be formed to have an irregular working surface.

Description

Die Erfindung bezieht sich auf eine Mühle mit mehreren Mahl­stufen, bestehend aus einem im wesentlichen zylindrischen, allen Mahlstufen gemeinsamen Stator, einem mit einer Vielzahl von in mehreren Stufen übereinander angeordneten Mahlplatten ausgerüsteten Rotor, mit einer Fördereinrichtung für ein Trägergas, das die Mühle mit dem Mahlgut durchsetzt, sowie mit einem Fingersichter im Auslaßbereich der Mühle.The invention relates to a mill with a plurality of grinding stages, consisting of an essentially cylindrical stator common to all grinding stages, a rotor equipped with a plurality of grinding plates arranged one above the other in several stages, with a conveying device for a carrier gas which supplies the mill with the regrind interspersed, as well as with a finger sifter in the outlet area of the mill.

Eine Mühle dieser Art ist aus der Druckschrift "Ultra-Rotor" der Firma "Altenburger Maschinen" bekannt. Das Zerkleinerungs­prinzip dieser mit Luft als Trägergas arbeitenden Mühle be­ruht darauf, daß die Mahlgutpartikel innerhalb der Vielzahl von Luftwirbeln, die von den Mahlplatten erzeugt werden, auf eine hohe Geschwindigkeit beschleunigt werden und vorzugsweise gegenseitige Stöße ausführen. Diese gegenseitigen Stöße führen zum Auseinanderbrechen der Teilchen. Nur ein geringer Teil der Zerkleinerungsvorgänge erfolgt durch das Zusammentreffen der Mahlgutteilchen mit den feststehenden oder rotierenden Maschinen­teilen. Dadurch, daß die gegenseitigen Zusammenstöße der Parti­kel im Luftstrom überwiegen, wird eine besonders schonende Feinstverkleinerung des Mahlgutes erreicht.A mill of this type is known from the publication "Ultra-Rotor" from the company "Altenburger Maschinen". The crushing principle of this mill, which works with air as the carrier gas, is based on the fact that the regrind particles within the large number of air vortices generated by the grinding plates are accelerated to a high speed and preferably execute mutual impacts. These mutual impacts break the particles apart. Only a small part of the shredding processes occurs when the regrind particles meet the stationary or rotating machine parts. The fact that the mutual collisions of the particles in the air flow predominate means that the ground material is reduced particularly gently.

Bewährt hat sich dieses Zerkleinerungsprinzip insbesondere beim Mahlen von temperaturempfindlichen Produkten. Dadurch, daß sich das Produkt ständig innerhalb turbulenter Luftströme befindet, wird die bei der Zerkleinerung unvermeidbar ent­stehende Wärme sofort abgeführt. Gleichzeitig wird auch gegebenenfalls vorhandene Feuchtigkeit von der Luft aufge­nommen, so daß zusätzlich eine intensive Trocknung feuchter Mahlgüter erreicht werden kann.This shredding principle has proven itself particularly when grinding temperature-sensitive products. Because the product is constantly in turbulent air flows, the heat that is unavoidable during shredding is immediately dissipated. At the same time, any moisture that may be present is also absorbed by the air, so that intensive drying of moist regrind can additionally be achieved.

Der im Auslaßbereich der Mühle angeordnete Fingersichter ist auf der Welle des Rotors angeordnet und hat damit eine dem Rotor entsprechende Drehzahl. Eine Anpassung der Sichtereigen­schaften, welche z.B. dann erwünscht ist, wenn mit höheren Trägergasraten gearbeitet wird, eine gleichzeitige Veränderung der Korngrößen des Mahlergebnisses jedoch vermieden werden soll, ist bei der vorbekannten Mühle nur dadurch möglich, daß die Sichterfinger ausgetauscht werden. Diese Maßnahme setzt äußerst umständliche Montagearbeiten voraus und hat damit lange Betriebsunterbrechungen zur Folge.The finger classifier arranged in the outlet area of the mill is arranged on the shaft of the rotor and thus has a speed corresponding to the rotor. An adaptation of the sifter properties, which e.g. if it is desired if higher carrier gas rates are used, but a simultaneous change in the grain sizes of the grinding result is to be avoided, it is only possible in the known mill by exchanging the classifier fingers. This measure requires extremely cumbersome assembly work and thus results in long business interruptions.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Mühle der eingangs genannten Art zu schaffen, bei der eine Veränderung der Sichtereigenschaften vorgenommen werden kann, ohne daß Montagearbeiten erforderlich sind.The present invention has for its object to provide a mill of the type mentioned, in which the sifter properties can be changed, without the need for assembly work.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß der Fingersichter mit einem separaten Antrieb ausgerüstet ist. Dadurch ist es möglich, die Drehzahl - und damit die Eigenschaften - des Fingersichters unabhängig von der Drehzahl des Rotors einstellen zu können. Nicht nur die Einstellung einer bestimmten Korngröße des Mahlergebnisses sondern auch eine Anpassung des Mahlvorganges an die Produkteigenschaften sind durch einfaches Verändern der Drehzahl des Fingersichters möglich.According to the invention, this object is achieved in that the finger classifier is equipped with a separate drive. This makes it possible to set the speed - and thus the properties - of the finger sifter independently of the speed of the rotor. Not only the setting of a certain grain size of the grinding result but also an adaptation of the grinding process to the product properties are possible by simply changing the speed of the finger sifter.

Weitere Vorteile und Einzelheiten der Erfindung sollen anhand von in den Figuren 1 bis 5 dargestellten Aus­führungsbeispielen erläutert werden.Further advantages and details of the invention will be explained on the basis of the exemplary embodiments illustrated in FIGS. 1 to 5.

Bei der in Figur 1 dargestellten Mühle sind der Stator bzw. das Statorgehäuse mit 1, der Rotor allgemein mit 2, der Speisetrichter mit 3 und die Speiseschnecke mit 4 bezeich­net.In the mill shown in FIG. 1, the stator or the stator housing is denoted by 1, the rotor generally by 2, the feed hopper by 3 and the feed screw by 4.

Die Mühle ist mit fünf übereinanderliegenden Mahlstufen 5 ausgerüstet. Jede Mahlstufe wird von einer auf dem Umfang einer Kreisscheibe 6 befestigten Vielzahl (z.B. ca. 50) be­festigten Mahlplatten 7 gebildet. Die Mahlplatten 7 erstrecken sich jeweils radial und parallel zur Drehachse 8 des Rotors. Die die Mahlplatten 7 tragenden Scheiben 6 sind an den Naben­abschnitten 9 befestigt, die ihrerseits mit der Welle 11 des Rotors 2 verbunden sind. Die Welle 11 ist oberhalb und unter­halb des Rotors 2 in Lagern 12, 13 gehaltert. Unterhalb des unteren Lagers 12 befindet sich der nicht dargestellte An­trieb.The mill is equipped with five superimposed grinding stages 5. Each grinding stage is formed by a plurality of grinding plates 7 fastened on the circumference of a circular disc 6 (e.g. about 50). The grinding plates 7 each extend radially and parallel to the axis of rotation 8 of the rotor. The discs 6 carrying the grinding plates 7 are fastened to the hub sections 9, which in turn are connected to the shaft 11 of the rotor 2. The shaft 11 is supported above and below the rotor 2 in bearings 12, 13. The drive, not shown, is located below the lower bearing 12.

Auf der Rotorwelle 11 ist zusätzlich das Radialgebläserad 15 befestigt, und zwar unmittelbar unterhalb der untersten Mahlstufe 5. Sein axialer Eintritt 16 ist nach unten gerich­tet und einem Raum 17 zugewandt, in den der Zuführungsschacht für das Mahlgut mit der Schnecke 4 und ein Luftzuführungs­kanal 18 münden. Zur besseren Führung des Mahlgutes und der Luft bei ihrem Eintritt in das Gebläserad 15 ist ein den Ein­ tritt 16 umgebender Rand 19 vorgesehen, der sich senkrecht zur Ebene des Rades 15 in Richtung des zentral gelegenen Raumes 17 erstreckt.On the rotor shaft 11, the radial impeller 15 is additionally fastened, specifically immediately below the lowest grinding stage 5. Its axial inlet 16 is directed downward and faces a space 17 into which the feed shaft for the ground material with the screw 4 and an air supply duct 18 open . For better guidance of the ground material and the air when it enters the impeller 15 is the one occurs 16 surrounding edge 19 is provided, which extends perpendicular to the plane of the wheel 15 in the direction of the central space 17.

Oberhalb der Mahlstufen 5 ist auf der Welle 11 eine Scheibe 21 befestigt, an deren Umfang die Sichterfinger 22 befestigt sind. Oberhalb der Sichterfinger 22 befindet sich eine im wesentlichen kreisringförmige Austrittsöffnung 23, an die sich der Ringkanal 24 und die Auslaßöffnung 25 anschließen. Die Auslaßöffnung 25 ist entweder direkt oder über nicht dar­gestellte Abscheider mit dem Ventilator 26 verbunden, dessen Motor mit 27 bezeichnet ist.Above the grinding stages 5, a disk 21 is attached to the shaft 11, on the circumference of which the classifier fingers 22 are attached. Above the classifier fingers 22 there is an essentially circular outlet opening 23, to which the ring channel 24 and the outlet opening 25 connect. The outlet opening 25 is connected either directly or via a separator, not shown, to the fan 26, the motor of which is designated 27.

In Figur 2 ist das Gebläserad 15 nochmals dargestellt. Es weist insgesamt acht nach hinten gekrümmte Schaufeln 28 auf.In Figure 2, the impeller 15 is shown again. It has a total of eight blades 28 curved to the rear.

Während des Betriebs der Mühle gelangen das Mahlgut und die sowohl für den Transport als auch für das Mahlen erforderliche Luftmenge in den Raum 17 und treten von dort aus axial-zentral in das Gebläserad 15 ein. Innerhalb des sich schnell drehenden Gebläserades 15 werden das Mahlgut und die Luft in Rotation versetzt und radial nach außen gefördert. Dadurch wird eine gleichmäßige Verteilung des Mahlgutes auf die Statorinnenwand bewirkt, dem sich ein ebenfalls gleichmäßiges Hochsteigen des Mahlgutes durch die Mahlstufen 5 anschließt. Gleichzeitig hat das Gebläserad 15 eine auflösende Wirkung, d.h., gegebenen­ falls vorhandene Mahlgutklumpen werden zerschlagen. Produkt und Luft durchsetzen danach die Mahlstufen 5. Ausreichend fein gemahlenes Gut ist in der Lage, mit der Trägerluft durch die rotierenden Sichterfinger hindurchzutreten. Durch den Kanal 24 und die Auslaßöffnung 25 verlassen das Mahlgut-­Luftgemisch die Mühle 1 und werden anschließend in den nicht dargestellten Abscheidern voneinander getrennt. Von den Sichterfingern zurückgehaltenes Mahlgut verläßt die Mühle durch die Überlaufklappe 29 und wird zum Mahlguteintritt zurückgeführt.During the operation of the mill, the ground material and the amount of air required for both transport and grinding enter the space 17 and from there enter the fan wheel 15 axially and centrally. Within the rapidly rotating fan wheel 15, the regrind and the air are set in rotation and conveyed radially outwards. This results in a uniform distribution of the ground material on the inner wall of the stator, which is followed by an equally uniform ascent of the ground material through the grinding stages 5. At the same time, the impeller 15 has a dissolving effect, that is, given if existing lumps of ground material are broken up. The product and air then pass through the grinding stages 5. Sufficiently finely ground material is able to pass through the rotating classifier fingers with the carrier air. Through the channel 24 and the outlet opening 25, the regrind-air mixture leave the mill 1 and are then separated from one another in the separators (not shown). Grist held back by the classifier fingers leaves the mill through the overflow flap 29 and is returned to the grist inlet.

Bei der dargestellten Mühle bewirken das Gebläserad 15 und der Ventilator 26 die Förderung des Trägergases und damit die Förderung des Mahlgutes. Die Förderleistung des Gebläses 15 entspricht der Drehzahl des Rotors 2, verändert sich also bei konstanter Rotordrehzahl nicht. Ist entsprechend einer vorteilhaften Weiterbildung der Erfindung die Drehzahl des Motors 27 und damit die Leistung des Ventilators 26 regelbar, dann kann damit Einfluß auf die Verweilzeit des Produktes im Bereich der Mahlstufen 5 genommen werden. Auch die Anpassung der zum Transport eines Produktes erforderlichen Trägergas-­Strömungsverhältnisse, die von vielen Eigenschaften des zu mahlenden Produktes, z.B. seinem spezifischen Gewicht, abhängen, ist mit Hilfe des regelbaren Ventilators 26 be­sonders einfach.In the mill shown, the impeller 15 and the fan 26 effect the conveyance of the carrier gas and thus the conveyance of the ground material. The delivery rate of the fan 15 corresponds to the speed of the rotor 2, so it does not change when the rotor speed is constant. If, according to an advantageous development of the invention, the speed of the motor 27 and thus the power of the fan 26 can be regulated, then the residence time of the product in the area of the grinding stages 5 can be influenced. Also the adaptation of the carrier gas flow conditions required for the transport of a product, which is dependent on many properties of the product to be ground, e.g. depend on its specific weight, is particularly simple with the help of the controllable fan 26.

Hat z.B. ein Produkt ein hohes spezifisches Gewicht, dann ist der obere Ventilator 26 auf eine hohe Förderleistung einzustellen, damit eine sichere Förderung des schweren Produkts gewährleistet ist.For example, if a product has a high specific weight, then the upper fan 26 is on a high delivery rate to ensure that the heavy product is conveyed safely.

Ist das Produkt feucht und soll die Feuchtigkeit während des Mahlprozesses verdampft werden, dann ist es zweckmäßig, den oberen Ventilator 26 zu drosseln. Dadurch wird die Ver­weilzeit des Luft-Material-Gemisches in der Mühle erhöht, so daß die gewünschte Trocknung während der Vermahlung ein­tritt. Die Trocknungsleistung kann noch dadurch erhöht wer­den, daß der Mühle 1 über den Kanal 18 Heißluft zugeführt wird.If the product is moist and the moisture is to be evaporated during the grinding process, it is expedient to throttle the upper fan 26. This increases the residence time of the air-material mixture in the mill, so that the desired drying occurs during the grinding. The drying capacity can be increased further by supplying hot air to the mill 1 via the channel 18.

Auch bei der Verarbeitung schwer mahlbarer Produkte, z.B. mit Faser-Charakter, ist der obere Ventilator zu drosseln, damit die gewünschte Mahlwirkung besser erzielt werden kann.Even when processing products that are difficult to grind, e.g. with fiber character, the upper fan must be throttled so that the desired grinding effect can be achieved better.

Bei der Verarbeitung von Produkten, die eine besonders scho­nende Mahlbehandlung erfordern, ist mit niedrigen Temperatu­ren zu fahren. Dieses kann dadurch erreicht werden, daß mit möglichst viel Luft gearbeitet wird. In Anwendungsfällen dieser Art ist deshalb die Förderleistung des oberen Ven­tilators 26 zu erhöhen.When processing products that require a particularly gentle grinding treatment, it is necessary to drive at low temperatures. This can be achieved by working with as much air as possible. In applications of this type, the delivery rate of the upper fan 26 must therefore be increased.

Weiterhin ist es im Rahmen der vorliegenden Erfindung zweck­mäßig, den oberhalb des Rotors 2 befindlichen Fingersichter mit einem eigenen Antrieb auszurüsten, so daß die Drehzahl des Fingersichters unabhängig von der Drehzahl des Rotors 2 einstellbar ist. Diese Maßnahme ermöglicht nicht nur eine Einflußnahme auf die Korngröße des Produkts, sie erlaubt auch die Anpassung des Mahlvorgangs an die Produkteigen­schaften. Soll z.B. ein spezifisch leichtes Produkt besonders fein und besonders schonend gemahlen werden, dann ist mit einem starken Trägergasstrom und besonders hoher Drehzahl des Fingersichters zu arbeiten. Der starke Trägergasstrom hält die Temperatur des Mahlgutes niedrig. Er hat aber auch die Wirkung, daß das Gut die Mühle besonders schnell durch­setzt, also nicht ausreichend fein gemahlen wird. Der schnell­drehende Fingersichter läßt deshalb das Produkt nicht aus der Mühle austreten. Es wird zum Mühleneintritt zurückgeführt. In dieser Zeit unterliegt es einer Mahlpause, so daß es sich weiter abkühlt, bevor es erneut dem Mahlprozess unterworfen wird.Furthermore, it is expedient in the context of the present invention, the finger sifter located above the rotor 2 to be equipped with its own drive so that the speed of the finger sifter can be set independently of the speed of the rotor 2. This measure not only makes it possible to influence the grain size of the product, it also allows the grinding process to be adapted to the product properties. If, for example, a specifically light product is to be ground particularly finely and particularly gently, then a strong carrier gas flow and a particularly high speed of rotation of the finger sifter must be used. The strong carrier gas flow keeps the temperature of the ground material low. However, it also has the effect that the material passes through the mill particularly quickly, that is to say it is not ground sufficiently finely. The fast rotating finger classifier therefore does not let the product come out of the mill. It is returned to the mill entrance. During this time, it is subject to a break from grinding, so that it cools down further before it is subjected to the grinding process again.

Figur 3 zeigt eine Ausführungsform für einen separaten Finger­sichter-Antrieb. Dazu ist dem oberen Ende der Welle 11 der nur zum Teil dargestellten Mühle 1 eine Hülse 31 zugeordnet, die über die Lager 32, 33 auf der Welle 11 drehbar gehaltert ist. Außerhalb der Hülse 31 ist ein weiteres Lager 34 vorge­ sehen, über das sich die Hülse 31 im Mühlengehäuse abstützt. Die Hülse 31 ist dadurch unabhängig von der rotierenden Welle 11 drehbar gelagert.Figure 3 shows an embodiment for a separate finger classifier drive. For this purpose, a sleeve 31 is assigned to the upper end of the shaft 11 of the mill 1, which is only shown in part, which is rotatably supported on the shaft 11 via the bearings 32, 33. Outside the sleeve 31, another bearing 34 is featured see through which the sleeve 31 is supported in the mill housing. The sleeve 31 is thereby rotatably supported independently of the rotating shaft 11.

Das untere Ende der Hülse 31 ragt in das Mühlengehäuse hinein und trägt dort die Scheibe 21 mit den Sichterfingern 22. Sie durchsetzt die Wandung des Mühlengehäuses und ist darin mit im einzelnen nicht näher bezeichneten Dichtringen abgedichtet. Außerhalb der Mühle ragt sie so weit hervor, daß sie mit einem regelbaren Antriebsmotor 35 über Riemen 36 koppelbar ist.The lower end of the sleeve 31 protrudes into the mill housing and there carries the disk 21 with the classifier fingers 22. It passes through the wall of the mill housing and is sealed therein with sealing rings, which are not described in detail. Outside the mill, it protrudes so far that it can be coupled to a controllable drive motor 35 by means of belts 36.

Üblicherweise haben die Finger 22 eine stabförmige Gestalt. Infolge ihrer radialen Anordnung nimmt deshalb der zwischen den Fingern befindliche Spalt in radialer Richtung zu. Um eine in radialer Richtung etwa gleichbleibende Spaltbreite zu erzielen, ist es im Rahmen der Erfindung zweckmäßig, Sich­terfinger zu verwenden, deren Breite in radialer Richtung zunimmt. Ausführungsbeispiele dafür sind in den Figuren 4 und 5 dargestellt. Mit Sichterfingern dieser Art kann ein vor­teilhafter Einfluß auf die Wirkung des Fingersichters, z.B. eine Vergleichmäßigung der Sichterwirkung, genommen werden.The fingers 22 usually have a rod-like shape. As a result of their radial arrangement, the gap between the fingers increases in the radial direction. In order to achieve an approximately constant gap width in the radial direction, it is expedient within the scope of the invention to use classifier fingers, the width of which increases in the radial direction. Exemplary embodiments for this are shown in FIGS. 4 and 5. With classifier fingers of this type, an advantageous influence on the action of the classifier, e.g. an equalization of the classifying effect.

Claims (7)

1) Mühle mit mehreren Mahlstufen (5), bestehend aus einem im wesentlichen zylindrischen, allen Mahlstufen (5) ge­meinsamen Stator (1), mit einem mit einer Vielzahl von in mehreren Stufen übereinander angeordneten Mahlplatten (7) ausgerüsteten Rotor (2), mit einer Fördereinrich­tung (26) für ein Trägergas, das die Mühle mit dem Mahl­gut durchsetzt, sowie mit einem Fingersichter (21, 22) im Auslaßbereich der Mühle, dadurch gekennzeichnet, daß der Fingersichter (21, 22) mit einem separaten An­trieb (35) ausgerüstet ist.1) Mill with several grinding stages (5), consisting of an essentially cylindrical stator (1) common to all grinding stages (5), with a rotor (2) equipped with a plurality of grinding plates (7) arranged one above the other in several stages a conveying device (26) for a carrier gas which passes through the mill with the ground material, and with a finger sifter (21, 22) in the outlet area of the mill, characterized in that the finger sifter (21, 22) is equipped with a separate drive (35) is. 2) Mühle nach Anspruch 1, dadurch gekennzeichnet, daß die Drehzahl des Antriebs (35) regelbar ist.2) Mill according to claim 1, characterized in that the speed of the drive (35) is adjustable. 3) Mühle nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß als Antrieb für den Fingersichter (21, 22) ein verstellbarer Getriebemotor (Ölmotor) vorgesehen ist.3) Mill according to claim 1 or 2, characterized in that an adjustable gear motor (oil motor) is provided as the drive for the finger classifier (21, 22). 4) Mühle nach Anspruch 1, 2 oder 3, dadurch gekenn­zeichnet, daß der Fingersichter (21, 22) an einer Hülse (31) befestigt ist, die den oberen Endbereich der Rotorwelle (11) umgibt, auf der Welle (11) drehbar gelagert ist (Lager 32, 33) und sich ihrer­seits über eine Lagerung (34) im Gehäuse der Mühle (1) abstützt.4) Mill according to claim 1, 2 or 3, characterized in that the finger classifier (21, 22) is attached to a sleeve (31) which surrounds the upper end region of the rotor shaft (11), rotatably mounted on the shaft (11) is (bearings 32, 33) and in turn is supported by a bearing (34) in the housing of the mill (1). 5) Mühle nach Anspruch 4, dadurch gekennzeichnet, daß mit dem sich außerhalb der Mühle (1) befindlichen Abschnitt der Hülse (31) der Antriebsmotor (35) gekoppelt ist.5) Mill according to claim 4, characterized in that the drive motor (35) is coupled to the portion of the sleeve (31) located outside the mill (1). 6) Mühle nach einem der Ansprüche 1 bis 5, dadurch ge­kennzeichnet, daß die Breite der Sichterfinger (22) in radialer Richtung nach außen zunimmt.6) Mill according to one of claims 1 to 5, characterized in that the width of the classifier fingers (22) increases in the radial direction to the outside. 7) Mühle nach Anspruch 6, dadurch gekennzeichnet, daß die Breite der Sichterfinger (22) derart in radialer Richtung nach außen zunimmt, daß der von zwei neben­einander angeordneten Sichterfingern (22) gebildete Spalt eine etwa gleichmäßige Breite hat.7) Mill according to claim 6, characterized in that the width of the classifier fingers (22) increases in the radial direction to the outside in such a way that the gap formed by two classifier fingers (22) arranged next to one another has an approximately uniform width.
EP19890113826 1985-12-07 1986-12-03 Plural-stage mill Withdrawn EP0347948A3 (en)

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DE19853543370 DE3543370A1 (en) 1985-12-07 1985-12-07 MILL WITH SEVERAL GRINDINGS
DE3543370 1985-12-07

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Also Published As

Publication number Publication date
DE3543370A1 (en) 1987-06-11
EP0226900B1 (en) 1991-07-17
EP0347948A3 (en) 1990-12-19
ATE65191T1 (en) 1991-08-15
DE3680305D1 (en) 1991-08-22
US4747550A (en) 1988-05-31
EP0226900A2 (en) 1987-07-01
EP0226900A3 (en) 1988-06-22
ES2023804B3 (en) 1992-02-16

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