EP0058886A2 - Agitator mill - Google Patents

Agitator mill Download PDF

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Publication number
EP0058886A2
EP0058886A2 EP82101000A EP82101000A EP0058886A2 EP 0058886 A2 EP0058886 A2 EP 0058886A2 EP 82101000 A EP82101000 A EP 82101000A EP 82101000 A EP82101000 A EP 82101000A EP 0058886 A2 EP0058886 A2 EP 0058886A2
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EP
European Patent Office
Prior art keywords
grinding
return
channel
agitator
agitator mill
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Granted
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EP82101000A
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German (de)
French (fr)
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EP0058886B1 (en
EP0058886A3 (en
Inventor
Horst Gross
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Draiswerke GmbH
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Draiswerke GmbH
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Publication of EP0058886A2 publication Critical patent/EP0058886A2/en
Publication of EP0058886A3 publication Critical patent/EP0058886A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B02C17/166—Mills in which a fixed container houses stirring means tumbling the charge of the annular gap type

Definitions

  • the invention relates to an agitator mill according to the preamble of claim 1.
  • Such an agitator mill with a cylindrical grinding chamber between an agitator formed by an agitator shaft with a cylindrical hollow body on the one hand and the inner wall of the grinding container on the other hand is known from DE-AS 11 84 188.
  • Such very narrow cylindrical grinding spaces with a gap width of about 5 to 15 mm have the advantage that the individual particles of the ground material in suspension or dispersion are exposed to grinding and shear forces very uniformly, so that the scatter in the fineness of grinding becomes very small . Since the radial extension of the actual grinding chamber is very small, the auxiliary grinding bodies accumulate in front of the separating device, since backflow is not sufficiently ensured, although the auxiliary grinding bodies move freely in the cylindrical grinding chamber flow in the grinding material / auxiliary grinding body flow during the grinding process.
  • This known principle of grinding aid return has the disadvantage that it is not possible to influence the return of the grinding aid, since the return is carried out by the high-speed stirrer which is practically inaccessible when the agitator mill is closed.
  • the invention is therefore based on the object of developing an agitator mill of the generic type in such a way that a return of the auxiliary grinding bodies is made possible in a simple manner, which in particular also enables the return to be influenced.
  • the return channel formed on the grinding container By returning the auxiliary grinding bodies through the return channel formed on the grinding container, the return is realized in a structurally very simple manner. Since the return channel is formed on the grinding container, an observation window can be attached in a very simple manner, through which an optical control is possible. Furthermore, the regrind also circulates through this channel, preferably the regrind particles which have not yet been comminuted sufficiently. The reason for this is that the auxiliary grinding bodies and also the corresponding portions of the ground material are returned by the centrifuging action of the agitator. A suction effect is generated by the opening of the return duct into the ground material inlet duct, which still supports the centrifuging effect. In addition, there is good premixing of regrind and auxiliary grinding media in the regrind inlet channel.
  • a great advantage of the configuration according to the invention is that the additional measures according to claim 3 are made possible.
  • the possibility of cross-section adjustment ensures that the agitator mill data, such as maximum energy utilization, i. high efficiency, is achievable.
  • the grinding media return can be influenced as a function of pressure, viscosity, throughput speed, temperature and grinding media size, which in turn allows the desired fineness of the grinding stock to be optimally influenced.
  • Claims 4 to 7 represent particularly advantageous measures for the design of the return channel and the adjustability of the free cross section of the return channel.
  • the adjustability of the free cross section can be regulated as a function of the operating parameters of the agitator mill, for example as a function of the power consumption of the drive motor.
  • the agitator mill shown in the drawing has in the usual way a stand 1, on the top of which a projecting support arm 2 is attached, to which in turn a cylindrical grinding container 3 is attached.
  • an electric drive motor 4 is accommodated, which is provided with a V-belt pulley 5, of which a V-belt pulley 8, which is non-rotatably connected to an agitator shaft 7, can be driven in rotation by means of the V-belt 6.
  • the grinding container 3 has a cooling jacket 9, which is delimited by a cylindrical inner wall 10 and a cylindrical outer wall 12 which is arranged concentrically to the central longitudinal axis 11 of the grinding container 3.
  • the inner wall 10 and the outer wall 12 are connected to one another at the top and bottom by annular flanges 13, 14.
  • a cooling water connection 15 opens at the bottom and a cooling water outlet 16 at the top.
  • a helically coiled pipeline 17 is arranged in the cooling jacket and bears against the inner wall 10 and the outer wall 12. In the subspaces of the cooling jacket 9 located between them, the cooling water is guided in a helical manner on its way from bottom to top, whereby the cooling effect is improved.
  • the pipeline 17 itself can be used to transport a heat transfer medium, for example a heating medium.
  • the grinding container 3 is closed at its lower end by a base plate 18 which is attached to the lower flange 13, for example by means of screws 19.
  • a mill feed channel 2o is formed, which opens approximately concentrically into the interior 21 of the grinding container 3, and can be pumped into this interior 21 from below through the material to be ground.
  • a cylindrical hollow body 22 which is closed on its end faces, is concentrically attached, which together with the stirrer shaft 7 forms a stirrer.
  • a narrow cylindrical ring space 23 which forms the actual grinding chamber.
  • the radial width b of this cylindrical ring space 23 is approximately 5 to 10 mm.
  • the interior 21 of the grinding container 3 - as far as it is not filled by the hollow body 22 - its volume filled 7o to 8 0% with auxiliary grinding bodies 24, the diameter do, is from 1 to 3 mm.
  • the following applies to the ratio of the gap width to the diameter of the auxiliary grinding bodies 24: b / d 5 to 20 .
  • a separating device 25 essentially consists of a ring 26 connected to the hollow body 22, that is to say rotating with the agitator, and a mating ring 27 fixedly connected to the grinding container 3, which overlap one another radially at a small axial distance, whereby a separating gap 28 is formed, the - determined by the axial distance between the ring 26 and the counter ring 27 - width is smaller than the smallest diameter d of the grinding aid body 24 used.
  • This separation gap 28 opens into a discharge space 29 which is formed between the stationary counter ring 27 and a cover 30 of the grinding container 3 .
  • a regrind outlet line 31 opens out, through which the ground regrind is discharged.
  • the separating device 25 is known for example from DE-PS 14 82 391.
  • the lid 3o is detachably fastened together with the counter ring 27 by means of screws 32 to the upper flange 14 of the grinding container 3.
  • the lid 3o itself is attached to a holding device 33, which is attached to the underside of the support arm 2, so that the grinding container 3 can be flanged from below in a conventional manner.
  • a tubular return channel 34 for regrind and auxiliary grinding body 24 is attached, which opens at the bottom into the regrind inlet channel 2o.
  • the return channel 34 is connected to the upper end of the cylinder ring space 23 via a return pipe which extends approximately radially to the longitudinal axis 11.
  • the inlet opening 36 of the nozzle 35 is thus just covered by the cylindrical hollow body 22.
  • the free cross section of the connector 35 or the channel 34 can be changed. This is achieved in the embodiment according to FIG. 2 in that an adjusting element 37 in the form of a displaceable piston is inserted from the outside into the socket 35, which can be inserted into the socket 35 at different depths, so that the entry into the return channel is either complete is released or partially covered.
  • This piston-shaped adjusting element is provided with a deflection surface 38, which deflects the ground material and in particular the grinding media on their way from the socket 35 into the channel 134 without any appreciable energy conversion.
  • a position of the adjusting element 37 is indicated in broken lines in FIG. 2, in which the free inlet cross section of the return channel 34 is approximately half closed.
  • the operation is as follows:
  • the free interior of the grinding vessel 3 is - as mentioned - filled 7o to 8 0% with auxiliary grinding bodies 24th
  • the agitator shaft 7 and thus the hollow body 22 are driven at high speed by the drive motor 4, ie for example at a speed of 100 rpm.
  • the mill feed channel 2o Through the mill feed channel 2o, the millbase is pressed into the interior 21 by means of a pump, which together with the mill auxiliary bodies 24 through the cylinder ring space 23, that is, the actual grinding chamber, rises to the top, the auxiliary grinding bodies 24 being acted upon by the hollow body 22 with angular momentum, which lead to intensive movements of the auxiliary grinding bodies 24 in the material to be ground, as a result of which fine grinding and Dispersion effect is achieved.
  • auxiliary grinding bodies 24 When the auxiliary grinding bodies 24 reach the height of the inlet opening 36 of the return nozzle 35, at least most of them are pressed by the centrifugal action into the return nozzle and pass through this and the return channel 34, from where they again enter the grinding material inlet. Channel 2o arrive. In this they are already mixed intensively with the regrind that is pumped in, so that they are relatively evenly distributed in the regrind as they enter the interior 21 of the grinding container 3.
  • ground material is of course also conveyed back and fed again to the grinding and dispersing effect. This is essentially ground material which has not yet been ground sufficiently finely and has therefore not yet emerged from the grinding container through the separating device 25.
  • the larger, i.e. not yet sufficiently finely ground, particles are thrown into the wall area and therefore preferentially reach the return nozzle 35. Since a suction effect on the reflux channel from the regrind inlet channel 2o Channel 34 is exerted, the centrifugal effect at the inlet opening 36 of the nozzle 35 is increased. This suction effect is further reinforced by the fact that the mill feed channel 2o widens at the mouth 39 of the channel 34 in the channel 120 - seen in the pumping direction 4o. In addition, a deflection partial surface 41 is also formed at this point in order to keep the flow losses during transport of the grinding aid bodies as low as possible.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Abstract

Eine Rührwerksmühle besteht aus einem Mahlbehälter (3) und einem in dem Mahlbehälter (3) angeordneten, hochtourig antreibbaren Rührwerk, zwischen dem und der Wand des Mahlbehälters (3) ein schmaler Zylinderring-Haum (23) als teilweise mit Mahlhilfskörpern gefüllter Mahlraum ausgebildet ist, in den an einem Ende ein Mahlgutzulauf-Kanal (20) einmündet, und an dessen anderem Ende eine Trenneinrichtung (25) zur Trennung von gemahlenem Mahlgut und Mahlhilfskörpern (24) vorgesehen ist. Um einen Rücklauf der Mahlhilfskörper (24) in einfacher Weise zu ermöglichen und insbesondere auch eine Beeinflussung des Rücklaufs zu ermöglichen, ist aus dem Mahlraum (Zylinderring-Raum 23) in der Nähe der Trenneinrichtung (25) ein Rücklauf-Kanal (34) in die Nähe des Mahlgutzulauf-Kanals (20) ortsfest am Mahlbehälter (3) zurückgeführt, wobei der freie Querschnitt des Rücklauf-Kanals (34) veränderbar ist.An agitator mill consists of a grinding container (3) and an agitator which can be driven at high speed and which is arranged in the grinding container (3), between which and the wall of the grinding container (3) a narrow cylindrical ring bowl (23) is formed as a grinding chamber partially filled with grinding aids, into which a grist inlet channel (20) opens at one end, and at the other end a separating device (25) is provided for separating ground grist and grinding aids (24). In order to allow the auxiliary grinding bodies (24) to return in a simple manner and, in particular, to also allow the return to be influenced, a return channel (34) is located in the grinding chamber (cylinder ring space 23) near the separating device (25) Close to the grinding material inlet channel (20) is guided back to the grinding container (3) in a stationary manner, the free cross section of the return channel (34) being changeable.

Description

Die Erfindung betrifft eine Rührwerksmühle gemäß dem Oberbegriff des Anspruches 1.The invention relates to an agitator mill according to the preamble of claim 1.

Eine derartige Rührwerksmühle mit einem zylinderringförmigen Mahlraum zwischen einem durch eine Rührwerkswelle mit zylindrischem Hohlkörper gebildeten Rührwerk einerseits und der Innenwand des Mahlbehälters andererseits ist aus der DE-AS 11 84 188 bekannt. Derartige sehr schmale zylinderringförmige Mahlräume mit einer Spaltweite von etwa 5 bis 15 mm haben den Vorteil, daß die einzelnen Partikel des in einer Suspension bzw. Dispersion befindlichen Mahlgutes sehr gleichmäßig Mahl- und Scherkräften ausgesetzt werden, so daß die Streuung in der Mahlfeinheit sehr klein wird. Da die radiale Erstreckung des eigentlichen Mahlraumes sehr gering ist, stauen sich die Mahlhilfskörper vor der Trenneinrichtung, da eine Rückströmung nicht ausreichend gewährleistet ist, obwohl die Mahlhilfskörper während des Mahlvorganges im zylinderringförmigen Mahlraum in-der Mahlgut-Mahlhilfskörper-Strömung sich frei bewegen.Such an agitator mill with a cylindrical grinding chamber between an agitator formed by an agitator shaft with a cylindrical hollow body on the one hand and the inner wall of the grinding container on the other hand is known from DE-AS 11 84 188. Such very narrow cylindrical grinding spaces with a gap width of about 5 to 15 mm have the advantage that the individual particles of the ground material in suspension or dispersion are exposed to grinding and shear forces very uniformly, so that the scatter in the fineness of grinding becomes very small . Since the radial extension of the actual grinding chamber is very small, the auxiliary grinding bodies accumulate in front of the separating device, since backflow is not sufficiently ensured, although the auxiliary grinding bodies move freely in the cylindrical grinding chamber flow in the grinding material / auxiliary grinding body flow during the grinding process.

Um einen Rücktransport der Mahlhilfskörper von der Mahlgutaustragsseite, also aus dem Bereich der Trenneinrichtung, zu erreichen, ist es aus der DE-PS 15 o7 5o4 bereits bekannt, bei einer Rührwerksmühle mit einem durch Scheiben auf einer Rührwerkswelle gebildeten Rührwerk in diesen Scheiben Löcher anzubringen, die eine radiale Komponente haben, so daß die von oben in ein solches Loch in einer Scheibe eintretenden Mahlhilfskörper jeweils nach unten beschleunigt werden, wodurch eine Art Rücklauf-Kanal gebildet wird.In order to achieve a return transport of the auxiliary grinding bodies from the grinding material discharge side, that is to say from the area of the separating device, it is already known from DE-PS 15 o7 5o4 to make holes in these disks in an agitator mill with an agitator formed by disks on an agitator shaft, which have a radial component, so that the grinding aid bodies entering such a hole in a disk from above are each accelerated downwards, thereby forming a type of return channel.

Aus der DE-OS 28 11 899 ist eine Rührwerksmühle mit einer Mahlhilfskörper-Rückführung bekannt, die nach dem gleichen Prinzip arbeitet, bei der also in dem Rührwerk ein oder mehrere Rücklaufkanäle mit einer radialen Richtungskomponente angebracht sind.From DE-OS 28 11 899 an agitator mill with a grinding aid return is known, which works on the same principle, in which one or more return channels with a radial directional component are thus installed in the agitator.

Dieses bekannte Prinzip der Mahlhilfskörper-Rückführung weist den Nachteil auf, daß eine Beeinflussung des Mahlhilfskörper-Rücklaufs nicht möglich ist, da der Rücklauf durch das hochtourig antreibbare, bei geschlossener Rührwerksmühle praktisch nicht zugängliche Rührwerk erfolgt.This known principle of grinding aid return has the disadvantage that it is not possible to influence the return of the grinding aid, since the return is carried out by the high-speed stirrer which is practically inaccessible when the agitator mill is closed.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Rührwerksmühle der gattungsgemäßen Art so weiterzubilden, daß ein Rücklauf der Mahl-Hilfskörper in einfacher Weise ermöglicht wird, die insbesondere auch eine Beeinflussung des Rücklaufs ermöglicht.The invention is therefore based on the object of developing an agitator mill of the generic type in such a way that a return of the auxiliary grinding bodies is made possible in a simple manner, which in particular also enables the return to be influenced.

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

Durch die Rückführung der Mahlhilfskörper durch den am Mahlbehälter ausgebildeten Rücklauf-Kanal wird der Rücklauf in konstruktiv sehr einfacher Weise realisiert. Da der Rücklauf-Kanal am Mahlbehälter ausgebildet ist, kann in sehr einfacher Weise ein Beobachtungsfenster angebracht werden, durch das eine optische Kontrolle möglich ist. Weiterhin erfolgt durch diesen Kanal auch ein Umlauf des Mahlgutes, und zwar bevorzugt der noch nicht ausreichend zerkleinerten Mahlgutpartikel. Dies hat seinen Grund darin, daß die Mahlhilfskörper und auch die entsprechenden Anteile des Mahlgutes durch die Zentrifugierwirkung des Rührwerks rückgeführt wird. Durch die Einmündung des Rücklaufkanals in den Mahlgutzulauf-Kanal wird eine Saugwirkung erzeugt, die die Zentrifugierwirkung noch unterstützt. Außerdem erfolgt eine gute Vormischung von Mahlgut und Mahlhilfskörpern im Mahlgutzulauf-Kanal.By returning the auxiliary grinding bodies through the return channel formed on the grinding container, the return is realized in a structurally very simple manner. Since the return channel is formed on the grinding container, an observation window can be attached in a very simple manner, through which an optical control is possible. Furthermore, the regrind also circulates through this channel, preferably the regrind particles which have not yet been comminuted sufficiently. The reason for this is that the auxiliary grinding bodies and also the corresponding portions of the ground material are returned by the centrifuging action of the agitator. A suction effect is generated by the opening of the return duct into the ground material inlet duct, which still supports the centrifuging effect. In addition, there is good premixing of regrind and auxiliary grinding media in the regrind inlet channel.

Ein großer Vorteil der erfindungsgemäßen Ausgestaltung liegt darin, daß die ergänzenden Maßnahmen nach Anspruch3 ermöglicht werden. Durch die Möglichkeit der Querschnittsverstellung wird erreicht, daß eine Optimierung der Rührwerksmühlen-Daten, wie beispielsweise maximale Energieausnutzung, d.h. hoher Wirkungsgrad, erreichbar ist. Durch die Veränderbarkeit des Querschnitts des Rücklauf-Kanals kann der Mahlkörper-Rücklauf in Abhängigkeit von Druck, Viskosität, Durchsatzgeschwindigkeit, Temperatur und Mahlkörpergröße beeinflußt werden, wodurch wiederum die gewünschte Feinheit des Mahlgutes optimal beeinflußbar ist.A great advantage of the configuration according to the invention is that the additional measures according to claim 3 are made possible. The possibility of cross-section adjustment ensures that the agitator mill data, such as maximum energy utilization, i. high efficiency, is achievable. By changing the cross-section of the return channel, the grinding media return can be influenced as a function of pressure, viscosity, throughput speed, temperature and grinding media size, which in turn allows the desired fineness of the grinding stock to be optimally influenced.

Die Ansprüche 4 bis 7 geben besonders vorteilhafte Maßnahmen für die Ausgestaltung des Rücklauf-Kanals und die Verstellbarkeit des freien Querschnitts des Rücklauf-Kanals wieder. Die Verstellbarkeit des freien Querschnittes kann in Abhängigkeit von Betriebsgrößen der Rührwerksmühle, beispielsweise in Abhängigkeit von der Leistungsaufnahme des Antriebsmotors, geregelt werden.Claims 4 to 7 represent particularly advantageous measures for the design of the return channel and the adjustability of the free cross section of the return channel. The adjustability of the free cross section can be regulated as a function of the operating parameters of the agitator mill, for example as a function of the power consumption of the drive motor.

Der erwähnte, die Zentrifugalwirkung unterstützende Saugeffekt wird durch die Maßnahmen nach Anspruch 8 noch vergrößert.The aforementioned suction effect, which supports the centrifugal effect, is further increased by the measures according to claim 8.

Weitere Vorteile und Merkmale der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels anhand der Zeichnung. In der Zeichnung zeigt

  • Fig. 1 eine Rührwerksmühle gemäß der Erfindung und
  • Fig. 2 den Mahlbehälter der Rührwerksmühle im Längsschnitt.
Further advantages and features of the invention result from the following description of an exemplary embodiment with reference to the drawing. In the drawing shows
  • Fig. 1 is an agitator mill according to the invention and
  • Fig. 2 shows the grinding vessel of the agitator mill in longitudinal section.

Die in der Zeichnung dargestellte Rührwerksmühle weist in üblicher Weise einen Ständer 1 auf, an dessen Oberseite ein vorkragender Tragarm 2 angebracht ist, an dem wiederum ein zylindrischer Mahlbehälter 3 befestigt ist. In dem Ständer 1 ist ein elektrischer Antriebsmotor 4 untergebracht, der mit einer Keilriemenscheibe 5 versehen ist, von der über Keilriemen 6 eine mit einer Rührwerkswelle 7 drehfest verbundene Keilriemenscheibe 8 drehend antreibbar ist.The agitator mill shown in the drawing has in the usual way a stand 1, on the top of which a projecting support arm 2 is attached, to which in turn a cylindrical grinding container 3 is attached. In the stand 1, an electric drive motor 4 is accommodated, which is provided with a V-belt pulley 5, of which a V-belt pulley 8, which is non-rotatably connected to an agitator shaft 7, can be driven in rotation by means of the V-belt 6.

Der Mahlbehälter 3 weist einen Kühlmantel 9 auf, der durch eine zylindrische Innenwand 1o und eine wie diese konzentrisch zur Mittel-Längsachse 11 des Mahlbehälters 3 angeordnete, ebenfalls zylindrische Außenwand 12 begrenzt wird. Die Innenwand 1o und die Außenwand 12 sind oben und unten durch ringförmige Flansche 13, 14 miteinander verbunden. In diesen so gebildeten Kühlmantel 9 mündet unten ein Kühlwasseranschluß 15 ein und oben ein Kühlwasserablauf 16 aus. Im Kühlmantel ist eine schraubenförmig gewendelte Rohrleitung 17 angeordnet, die an der Innenwand 1o und der Außenwand 12 anliegt. In den zwischen ihr befindlichen Teilräumen des Kühlmantels 9 wird das Kühlwasser auf seinem Weg von unten nach oben schraubenlinienförmig geführt, wodurch die Kühlwirkung verbessert wird. Andererseits kann die Rohrleitung 17 selber zum Transport eines Wärmeübertragungsmediums, beispielsweise eines Heizmediums, dienen.The grinding container 3 has a cooling jacket 9, which is delimited by a cylindrical inner wall 10 and a cylindrical outer wall 12 which is arranged concentrically to the central longitudinal axis 11 of the grinding container 3. The inner wall 10 and the outer wall 12 are connected to one another at the top and bottom by annular flanges 13, 14. In this cooling jacket 9 thus formed, a cooling water connection 15 opens at the bottom and a cooling water outlet 16 at the top. A helically coiled pipeline 17 is arranged in the cooling jacket and bears against the inner wall 10 and the outer wall 12. In the subspaces of the cooling jacket 9 located between them, the cooling water is guided in a helical manner on its way from bottom to top, whereby the cooling effect is improved. On the other hand, the pipeline 17 itself can be used to transport a heat transfer medium, for example a heating medium.

Der Mahlbehälter 3 ist an seinem unteren Ende durch eine Bodenplatte 18 abgeschlossen, die beispielsweise mittels Schrauben 19 am unteren Flansch 13 angebracht ist. In der Bodenplatte 18 ist ein Mahlgutzulauf-Kanal 2o ausgebildet, der etwa konzentrisch in den Innenraum 21 des Mahlbehälters 3 einmündet, und durch den Mahlgut von unten in diesen Innenraum 21 gepumpt werden kann.The grinding container 3 is closed at its lower end by a base plate 18 which is attached to the lower flange 13, for example by means of screws 19. In the base plate 18, a mill feed channel 2o is formed, which opens approximately concentrically into the interior 21 of the grinding container 3, and can be pumped into this interior 21 from below through the material to be ground.

An der konzentrisch zur Längsachse 11 angeordneten Rührwerkswelle 7 ist ein zylindrischer, an seinen Stirnseiten geschlossener Hohlkörper 22 konzentrisch angebracht, der zusammen mit der Rührwerkswelle 7 ein Rührwerk bildet. Zwischen dem Hohlkörper 22 und der zylindrischen Innenwand 1o des Mahlbehälters 3 ist ein schmaler Zylinderring-Raum 23 begrenzt, der den eigentlichen Mahlraum bildet. Die radiale Breite b dieses Zylinderring-Raums 23 beträgt etwa 5 bis 1o mm.On the stirrer shaft 7, which is arranged concentrically to the longitudinal axis 11, a cylindrical hollow body 22, which is closed on its end faces, is concentrically attached, which together with the stirrer shaft 7 forms a stirrer. Between the hollow body 22 and The cylindrical inner wall 10 of the grinding container 3 is delimited by a narrow cylindrical ring space 23 which forms the actual grinding chamber. The radial width b of this cylindrical ring space 23 is approximately 5 to 10 mm.

Der Innenraum 21 des Mahlbehälters 3 ist - soweit er nicht durch den Hohlkörper 22 ausgefüllt wird - zu 7o bis 80% seines Volumens mit Mahlhilfskörpern 24 gefüllt, deren Durchmesser d o,1 bis 3 mm beträgt. Für das Verhältnis der Spaltbreite zum Durchmesser der Mahlhilfskörper 24 gilt: b/d = 5 bis 20.The interior 21 of the grinding container 3 - as far as it is not filled by the hollow body 22 - its volume filled 7o to 8 0% with auxiliary grinding bodies 24, the diameter do, is from 1 to 3 mm. The following applies to the ratio of the gap width to the diameter of the auxiliary grinding bodies 24: b / d = 5 to 20 .

Am oberen Ende wird der Innenraum 21 des Mahlbehälters 3 durch eine Trenneinrichtung 25 abgeschlossen. Diese Trenneinrichtung besteht im wesentlichen aus einem mit dem Hohlkörper 22 verbundenen, also mit dem Rührwerk umlaufenden Ring 26, und einem mit dem Mahlbehälter 3 fest verbundenen Gegenring 27, die einander radial in geringem axialen Abstand überlappen, wodurch ein Trennspalt 28 gebildet wird, dessen - durch den axialen Abstand von Ring 26 und Gegenring 27 bestimmte - Breite kleiner ist als der kleinste Durchmesser d eingesetzter Mahl- hilfskörper 24. Dieser Trennspalt 28 mündet in einen Austragsraum 29, der zwischen dem ortsfesten Gegenring 27 und einem Deckel 3o des Mahlbehälters 3 ausgebildet ist. Aus diesem Austragsraum 29 mündet eine Mahlgutauslauf-Leitung 31 aus, durch die das fertiggemahlene Mahlgut ausgetragen wird. Die Trenneinrichtung 25 ist beispielsweise aus der DE-PS 14 82 391 bekannt. Der Deckel 3o ist gemeinsam mit dem Gegenring 27 mittels Schrauben 32 am oberen Flansch 14 des Mahlbehälters 3 lösbar befestigt. Der Deckel 3o selber wiederum ist an einer Halteeinrichtung 33 angebracht, die an der Unterseite des Tragarms 2 angebracht ist, so daß in üblicher Weise der Mahlbehälter 3 von unten angeflanscht werden kann.At the upper end, the interior 21 of the grinding container 3 is closed off by a separating device 25. This separating device essentially consists of a ring 26 connected to the hollow body 22, that is to say rotating with the agitator, and a mating ring 27 fixedly connected to the grinding container 3, which overlap one another radially at a small axial distance, whereby a separating gap 28 is formed, the - determined by the axial distance between the ring 26 and the counter ring 27 - width is smaller than the smallest diameter d of the grinding aid body 24 used. This separation gap 28 opens into a discharge space 29 which is formed between the stationary counter ring 27 and a cover 30 of the grinding container 3 . From this discharge space 29, a regrind outlet line 31 opens out, through which the ground regrind is discharged. The separating device 25 is known for example from DE-PS 14 82 391. The lid 3o is detachably fastened together with the counter ring 27 by means of screws 32 to the upper flange 14 of the grinding container 3. The lid 3o itself is attached to a holding device 33, which is attached to the underside of the support arm 2, so that the grinding container 3 can be flanged from below in a conventional manner.

Auf der Außenseite der Außenwand 12 ist ein rohrförmiger Rücklauf -Kanal 34 für Mahlgut und Mahlhilfskörper 24 angebracht, der unten in den Mahlgutzulauf-Kanal 2o einmündet. Im oberen Bereich ist der Rücklauf-Kanal 34 über einen sich etwa radial zur Längsachse 11 erstreckenden Rücklaufstutzen an das obere Ende des Zylinderring-Raums 23 angeschlossen. Die Einlaßöffnung 36 des Stutzens 35 ist also gerade noch von dem zylindrischen Hohlkörper 22 überdeckt. Der freie Querschnitt des Stutzens 35 bzw. des Kanals 34 ist veränderbar. Dies wird bei der Ausgestaltung nach Fig. 2 dadurch erreicht, daß von außen in den Sutzen 35 ein Verstellelement 37 in Form eines verschiebbaren Kolbens eingeführt ist, der verschieden tief in den Stutzen 35 einführbar ist, wodurch der Einlauf in den Rücklauf-Kanal entweder vollständig freigegeben wird oder teilweise überdeckt wird. Dieses kolbenförmige Verstellelement ist mit einer Umlenkfläche 38 versehen, die das Mahlgut und insbesondere die Mahlkörper auf ihrem Weg vom Stutzen 35 in den Kana134- ohne nennenswerte Energieumsetzung umlenken. In Fig. 2 ist gestrichelt eine Stellung des Verstellelementes 37 angedeutet, in der der freie Einlaufquerschnitt des Rücklaufkanals 34 etwa zur Hälfte verschlossen ist.On the outside of the outer wall 12, a tubular return channel 34 for regrind and auxiliary grinding body 24 is attached, which opens at the bottom into the regrind inlet channel 2o. In the upper region, the return channel 34 is connected to the upper end of the cylinder ring space 23 via a return pipe which extends approximately radially to the longitudinal axis 11. The inlet opening 36 of the nozzle 35 is thus just covered by the cylindrical hollow body 22. The free cross section of the connector 35 or the channel 34 can be changed. This is achieved in the embodiment according to FIG. 2 in that an adjusting element 37 in the form of a displaceable piston is inserted from the outside into the socket 35, which can be inserted into the socket 35 at different depths, so that the entry into the return channel is either complete is released or partially covered. This piston-shaped adjusting element is provided with a deflection surface 38, which deflects the ground material and in particular the grinding media on their way from the socket 35 into the channel 134 without any appreciable energy conversion. A position of the adjusting element 37 is indicated in broken lines in FIG. 2, in which the free inlet cross section of the return channel 34 is approximately half closed.

Die Wirkungsweise ist folgendermaßen: Der freie Innenraum des Mahlbehälters 3 ist - wie erwähnt - zu 7o bis 80 % mit Mahlhilfskörpern 24 gefüllt. Die Rührwerkswelle 7 und damit der Hohlkörper 22 werden von dem Antriebsmotor 4 hochtourig, d.h. beispielsweise mit einer Drehzahl von looo UpM,angetrieben. Durch den Mahlgutzulauf-Kanal 2o wird mittels einer Pumpe Mahlgut von unten in den Innenraum 21 gedrückt, das zusammen mit den Mahlhilfskörpern 24 durch den Zylinderring-Raum 23, also den eigentlichen Mahlraum, nach oben steigt, wobei die Mahlhilfskörper 24 durch den Hohlkörper 22 mit Drehimpulsen beaufschlagt werden, die zu intensiven Bewegungen der Mahlhilfskörper 24 im Mahlgut führen, wodurch in bekannter Weise ein Feinstmahl- und Dispergier-Effekt erreicht wird. Wenn die Mahlhilfskörper 24 die Höhe der Einlaßöffnung 36 des Rücklauf-Stutzens 35 erreichen, werden zumindest die meisten von ihnen durch die Zentrifugalwirkung in den Rücklauf-Stutzen gedrückt und durchlaufen diesen und den Rücklauf-Kanal 34, von wo aus sie wieder in den Mahlgutzulauf-Kanal 2o gelangen. In diesem werden sie bereits mit dem zugepumpten Mahlgut intensiv vermischt, so daß sie bereits beim Eintritt in den Innenraum 21 des Mahlbehälters 3 verhältnismäßig gleichmäßig im Mahlgut verteilt sind. Durch den Rücklauf- Stutzen 35 und den Rücklaufkanal 34 wird selbstverständlich auch Mahlgut zurückgefördert und dem Mahl- und Dispergiereffekt erneut zugeführt. Es handelt sich hierbei im wesentlichen um Mahlgut, das noch nicht ausreichend fein gemahlen ist und daher noch nicht durch die Trenneinrichtung 25 aus dem Mahlbehälter ausgetreten ist. Durch die hohen, auch auf die Mahlgutpartikelchen wirkenden Zentrifugalkräfte werden die größeren, also noch nicht ausreichend fein gemahlenen Partikel mehr in den Wandbereich geschleudert und gelangen daher bevorzugt in den Rücklauf-Stutzen 35. Da vom Mahlgutzulauf-Kanal 2o her ein Saugeffekt auf den Rücklauf-Kanal 34 ausgeübt wird, wird die Zentrifugalwirkung an der Einlaßöffnung 36 des Stutzens 35 noch verstärkt. Dieser Saugeffekt wird wiederum noch dadurch verstärkt, daß der Mahlgutzulauf-Kanal 2o an der Einmündung 39 des Kanals 34 in den Kana120 sich-in Pumprichtung 4o gesehen - erweitert. Außerdem ist auch an dieser Stelle eine Umlenk-Teilfläche 41 ausgebildet, um die Strömungsverluste beim Transport der Mahl- hilfskörper möglichst gering zu halten.The operation is as follows: The free interior of the grinding vessel 3 is - as mentioned - filled 7o to 8 0% with auxiliary grinding bodies 24th The agitator shaft 7 and thus the hollow body 22 are driven at high speed by the drive motor 4, ie for example at a speed of 100 rpm. Through the mill feed channel 2o, the millbase is pressed into the interior 21 by means of a pump, which together with the mill auxiliary bodies 24 through the cylinder ring space 23, that is, the actual grinding chamber, rises to the top, the auxiliary grinding bodies 24 being acted upon by the hollow body 22 with angular momentum, which lead to intensive movements of the auxiliary grinding bodies 24 in the material to be ground, as a result of which fine grinding and Dispersion effect is achieved. When the auxiliary grinding bodies 24 reach the height of the inlet opening 36 of the return nozzle 35, at least most of them are pressed by the centrifugal action into the return nozzle and pass through this and the return channel 34, from where they again enter the grinding material inlet. Channel 2o arrive. In this they are already mixed intensively with the regrind that is pumped in, so that they are relatively evenly distributed in the regrind as they enter the interior 21 of the grinding container 3. Through the return nozzle 35 and the return channel 34, ground material is of course also conveyed back and fed again to the grinding and dispersing effect. This is essentially ground material which has not yet been ground sufficiently finely and has therefore not yet emerged from the grinding container through the separating device 25. Due to the high centrifugal forces, which also act on the regrind particles, the larger, i.e. not yet sufficiently finely ground, particles are thrown into the wall area and therefore preferentially reach the return nozzle 35. Since a suction effect on the reflux channel from the regrind inlet channel 2o Channel 34 is exerted, the centrifugal effect at the inlet opening 36 of the nozzle 35 is increased. This suction effect is further reinforced by the fact that the mill feed channel 2o widens at the mouth 39 of the channel 34 in the channel 120 - seen in the pumping direction 4o. In addition, a deflection partial surface 41 is also formed at this point in order to keep the flow losses during transport of the grinding aid bodies as low as possible.

Claims (8)

1. Rührwerksmühle, bestehend aus einem Mahlbehälter (3) mit einem in dem Mahlbehälter (3) angeordneten, hochtourig antreibbaren Rührwerk, zwischen dem und der Wand des Mahlbehälters (3) ein schmaler Zylinderring-Raum (23) als teilweise mit Mahlhilfskörpern gefüllter Mahlraum ausgebildet ist, in den an einem Ende ein Mahlgutzulauf-Kanal (20) einmündet, und an dessen anderem Ende eine Trenneinrichtung (29 zur Trennung von gemahlenem Mahlgut und Mahlhilfskörpern vorgesehen ist, dadurch gekennzeichnet, daß aus dem Mahlraum (Zylinderring-Raum 23) in der Nähe der Trenneinrichtung (25) ein Rücklauf-Kanal (34) in die Nähe des Mahlgutzulauf-Kanals (20) ortsfest am Mahlbehälter (3) zurückgeführt ist.1. agitator mill, consisting of a grinding container (3) with an arranged in the grinding container (3), high-speed driven agitator, between the and the wall of the grinding container (3) a narrow cylindrical ring space (23) as a partially filled with grinding aids grinding chamber is, in which a grist inlet channel (20) opens at one end, and at the other end a separating device (29 for separating ground grist and grinding aids is provided, characterized in that from the grinding chamber (cylindrical ring space 23) in the In the vicinity of the separating device (25), a return channel (34) is returned to the grinding container (3) in a fixed position in the vicinity of the grinding material inlet channel (20). 2. Rührwerksmühle nach Patentanspruch 1, dadurch gekennzeichnet, daß der Rücklauf-Kanal (34) in den Mahlgutzulauf-Kanal zurückgeführt ist.2. Agitator mill according to claim 1, characterized in that the return channel (34) is fed back into the mill feed channel. 3. Rührwerksmühle nach Patentanspruch 1 oder 2, dadurch gekennzeichnet, daß der freie Querschnitt des Rücklauf- Kanals (34) veränderbar ist.3. agitator mill according to claim 1 or 2, characterized in that the free cross section of the return channel (34) is variable. 4. Rührwerksmühle nach einem der Patentansprüche 1 bis 3, dadurch gekennzeichnet, daß der Rücklauf-Kanal (34) etwa in einer Radialebene über einen Rücklauf-Stutzen (35) aus dem Mahlraum (Zylinderring-Raum 23) ausmündet.4. Agitator mill according to one of the claims 1 to 3, characterized in that the return channel (34) opens out approximately in a radial plane via a return nozzle (35) from the grinding chamber (cylindrical ring chamber 23). 5. Rührwerksmühle nach einem der Patentansprüche 1 bis 4, dadurch gekennzeichnet, daß im Rücklauf-Kanal (34) ein verschiebbares Verstellelement (37) angeordnet ist.5. Agitator mill according to one of the claims 1 to 4, characterized in that a displaceable adjusting element (37) is arranged in the return channel (34). 6. Rührwerksmühle nach den Patentansprüchen 3 bis 5, dadurch gekennzeichnet, daß das Verstellelement (37) im Rücklauf-Stutzen (35) angeordnet ist.6. agitator mill according to claims 3 to 5, characterized in that the adjusting element (37) is arranged in the return nozzle (35). 7. Rührwerksmühle nach Patentanspruch 5 oder 6, dadurch gekennzeichnet, daß an dem Verstellelement (37) eine Umlenkfläche (38) ausgebildet ist.7. agitator mill according to claim 5 or 6, characterized in that a deflection surface (38) is formed on the adjusting element (37). 8. Rührwerksmühle nach einem der Patentansprüche 1 bis 7, dadurch gekennzeichnet, daß der Mahlgutzulauf-Kanal (20) an der Einmündung (39) des Rücklauf-Kanals (34) - in Förderrichtung (40) des Mahlgutes gesehen - eine Erweiterung aufweist.8. agitator mill according to one of the claims 1 to 7, characterized in that the mill feed channel (20) at the mouth (39) of the return channel (34) - seen in the conveying direction (40) of the millbase - has an extension.
EP82101000A 1981-02-19 1982-02-11 Agitator mill Expired EP0058886B1 (en)

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DE19813106062 DE3106062A1 (en) 1981-02-19 1981-02-19 AGITATOR MILL
DE3106062 1981-02-19

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EP0058886A2 true EP0058886A2 (en) 1982-09-01
EP0058886A3 EP0058886A3 (en) 1984-05-30
EP0058886B1 EP0058886B1 (en) 1986-05-07

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WO1988009212A1 (en) * 1987-05-18 1988-12-01 Draiswerke Gmbh Stirring mill
EP0312932A2 (en) * 1987-10-20 1989-04-26 Tioxide Specialties Limited Grinding process
EP0322623A2 (en) * 1987-12-28 1989-07-05 Inoue Seisakusho (Mfg) Co., Ltd. Dispersing and grinding apparatus
EP0483808A1 (en) * 1990-10-31 1992-05-06 Matsushita Electric Industrial Co., Ltd. Agitating mill and method for milling
DE4432200C1 (en) * 1994-09-09 1996-02-29 Evv Vermoegensverwaltungs Gmbh Agitator mill
EP0700723A1 (en) 1994-09-09 1996-03-13 EVV-Vermögensverwaltungs-GmbH Agitator mill
EP0700721A1 (en) 1994-09-09 1996-03-13 EVV-Vermögensverwaltungs-GmbH Agitator mill
EP0982074A1 (en) 1998-08-28 2000-03-01 DRAISWERKE GmbH Agitator mill

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AU616412B2 (en) * 1987-05-18 1991-10-31 Buhler Gmbh Stirring mill
US5062577A (en) * 1987-05-18 1991-11-05 Draiswerke Gmbh Agitator mill
EP0312932A2 (en) * 1987-10-20 1989-04-26 Tioxide Specialties Limited Grinding process
EP0312932A3 (en) * 1987-10-20 1989-09-27 Ici Australia Operations Proprietary Limited Grinding process
US5033682A (en) * 1987-10-20 1991-07-23 Ici Australia Operations Propreitary Limited Grinding process
EP0322623A2 (en) * 1987-12-28 1989-07-05 Inoue Seisakusho (Mfg) Co., Ltd. Dispersing and grinding apparatus
EP0322623A3 (en) * 1987-12-28 1990-05-23 Inoue Seisakusho (Mfg) Co., Ltd. Dispersing and grinding apparatus
EP0483808A1 (en) * 1990-10-31 1992-05-06 Matsushita Electric Industrial Co., Ltd. Agitating mill and method for milling
US5320284A (en) * 1990-10-31 1994-06-14 Matsushita Electric Industrial Co., Ltd. Agitating mill and method for milling
DE4432200C1 (en) * 1994-09-09 1996-02-29 Evv Vermoegensverwaltungs Gmbh Agitator mill
EP0700723A1 (en) 1994-09-09 1996-03-13 EVV-Vermögensverwaltungs-GmbH Agitator mill
EP0700721A1 (en) 1994-09-09 1996-03-13 EVV-Vermögensverwaltungs-GmbH Agitator mill
EP0700722A1 (en) 1994-09-09 1996-03-13 EVV-Vermögensverwaltungs-GmbH Agitator mill
EP0982074A1 (en) 1998-08-28 2000-03-01 DRAISWERKE GmbH Agitator mill
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Also Published As

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EP0058886B1 (en) 1986-05-07
DK70782A (en) 1982-08-20
DE3106062A1 (en) 1982-09-09
JPS57147449A (en) 1982-09-11
JPH0260380B2 (en) 1990-12-17
DK154475C (en) 1989-05-22
DE3270933D1 (en) 1986-06-12
EP0058886A3 (en) 1984-05-30
DK154475B (en) 1988-11-21
US4496106A (en) 1985-01-29

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