EP2484450B2 - Stirring-typ ball mill - Google Patents

Stirring-typ ball mill Download PDF

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Publication number
EP2484450B2
EP2484450B2 EP12000233.2A EP12000233A EP2484450B2 EP 2484450 B2 EP2484450 B2 EP 2484450B2 EP 12000233 A EP12000233 A EP 12000233A EP 2484450 B2 EP2484450 B2 EP 2484450B2
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EP
European Patent Office
Prior art keywords
grinding container
grinding
ball mill
agitator
suspension
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EP12000233.2A
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German (de)
French (fr)
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EP2484450A3 (en
EP2484450B1 (en
EP2484450A2 (en
Inventor
Eberhard Lipp
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Lipp Mischtechnik GmbH
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Lipp Mischtechnik GmbH
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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
    • 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
    • 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
    • B02C17/18—Details
    • 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
    • B02C17/18—Details
    • B02C17/183—Feeding or discharging 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
    • 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
    • B02C17/18—Details
    • B02C17/24—Driving mechanisms

Definitions

  • the invention relates to an agitator ball mill with a grinding container and an axially extending agitator shaft which is connected at at least one end to the wall of the grinding container via a rotary feedthrough. According to the preamble of the attached main claim.
  • agitator ball mills are used to comminute the solids of liquid, disperse systems or suspensions.
  • grinding media are mostly balls made of steel, glass or ceramic materials.
  • the axially arranged agitator shaft can be found inside the grinding container, on which agitator elements such as disks or rods are arranged in a rotationally fixed manner.
  • the rotation of this stirrer shaft causes the grinding media to move intensively.
  • Said suspension is pumped through the grinding container of the agitator ball mill with simultaneous rotation of the agitator shaft, the solid particles within the suspension being comminuted by the impact and shear forces acting on them, which are generated by the grinding media.
  • a suitable device is then provided at the outlet of the grinding container, by means of which the grinding bodies are held in the grinding container while the suspension with the comminuted solids contained therein can exit.
  • a particular problem from a structural point of view for the safe operation of an agitator ball mill is the sealing of the rotary leadthrough at the entry of the agitator ball shaft into the grinding container.
  • grinding media will damage the rotating unions present here, be it through impact or through friction. This risk is particularly high when mechanical seals are used for the rotary feedthrough.
  • a protective disk covering the rotary leadthrough is arranged in the grinding container adjacent to the rotary leadthrough.
  • Corresponding devices are known from DE 10 2008 058 585 A1 , of the EP 0 074 633 B1 or the U.S. 5,330,112 A .
  • the object of the present invention is therefore to develop previously known agitator ball mills.
  • the agitator ball mill according to the invention is defined by claim 1.
  • the protective disk is attached to the agitator shaft.
  • the position of the protective disk can be fixed well within the grinding container without having to provide a fastening for the protective disk that would hinder the throughput of ground material.
  • the protective disk is provided on its side facing the rotary feedthrough with conveyor vanes extending essentially in the radial direction. The resulting flow of incoming suspension, first in the radial direction and then past the protective disk in the axial direction, produces a particularly good conveying effect for suspension through the grinding container.
  • the suspension in the axial direction, .d. H. is introduced into the grinding container parallel to the direction of the agitator shaft.
  • a convergent annular gap which is present on the circumference of the protective disk between it and the surrounding wall of the grinding container, can ensure, on the one hand, that suspension is fed evenly into the grinding container.
  • this convergent annular gap also breaks up coarse agglomerations of solid materials in the suspension, for which purpose the shear stresses within the suspension that occur when the suspension passes through said convergent gap can be used.
  • the radial dimensions of the convergent gap in particular at its end facing the interior of the grinding container, are selected so that grinding bodies with their usual dimensions cannot penetrate the gap.
  • the grinding container is provided with a ball drain on its wall, which is located in the area of the side of the protective disk facing the grinding container.
  • FIG. 1 you can see the side view of an agitator ball mill.
  • a vertically arranged agitator shaft 3 is driven via an electric motor 1 with the interposition of a gear arranged in a gear box 2.
  • This agitator shaft is equipped with agitating elements aligned in the axial direction in the form of rods 4 which mesh with counter rods 5 which are arranged on the wall 6 of the grinding container 7 and project radially inward.
  • the wall 6 is designed with two shells, so that it forms a cooling jacket 8, into which cooling water is introduced through a cooling water inlet 9 and is discharged again from a cooling water outlet 10.
  • the agitator shaft 3 is also designed to be correspondingly cooled.
  • the interior of the grinding container 7 is for the most part filled with grinding bodies 11 which take up a volume of 60 to 80% of the free space in the grinding container 7.
  • a suspension is now pumped through the interior of the grinding container 7.
  • the grinding media 11 are set in motion, the solid particles in the suspension mentioned being comminuted by the impact and shear forces of the grinding media that collide with one another.
  • annular gap 12 At the upper end of the grinding container there is an annular gap 12 through which the suspension with the comminuted solid particles passes in order to leave the grinding container 7 through a suspension outlet 13. Its dimensions, in particular the clear width of the annular gap 12, prevent the grinding media from being discharged from the grinding container 11.
  • a protective disk 16 is provided on the agitator shaft 3 in this area. This extends in the radial direction over the actual rotary leadthrough 14 and thus prevents individual grinding media 11 from hitting the rotary leadthrough 14 and damaging it.
  • the protective disk 16 is formed in one piece with the agitator shaft 3 and also has conveying vanes 17 extending in the radial direction on its side facing the rotary leadthrough 14. With these conveying vanes 17, suspension which enters the grinding container 7 parallel to the axis of the agitator shaft 3 through a feed pipe 18 is conveyed into the grinding container 3 as with a pump wheel of a centrifugal pump.
  • This suspension is deflected in the radial direction after exiting the feed pipe 18 and is then, as shown in FIG Figure 2 can be seen, pressed through a convergent gap 19 aligned in the axial direction, as a result of which the suspension is specifically accelerated and thus subjected to shear, which leads to a breakdown of agglomerations of particles within the suspension.
  • the clear width of the convergent gap lying in the radial direction is selected so that it is smaller at the end of the annular gap facing the interior of the grinding container 7 than a conventional size of a grinding body 11. This prevents undesired penetration of grinding bodies 11 into the gap 19 and thus also prevented in the space between the protective disk 16 and the rotary leadthrough 14 and the rotary leadthrough 14 is thus reliably protected from wear caused by grinding media.
  • This ball emptying opening 22 is provided in the wall 6 of the flour container 7 and can be closed by a plug 23. When this plug 23 is removed, the grinding bodies 11 present in the grinding container 7 can be removed for replacement through the ball emptying opening 22.
  • the rotary feedthrough 14 is protected by the protective disk 16 and thus the agitator ball mill can be designed to be more reliable.

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

Description

Die Erfindung betrifft eine Rührwerkskugelmühle mit einem Mahlbehälter und einer axial in diesem verlaufenden Rührwelle, die an wenigstens einem Ende über eine Drehdurchführung mit der Wandung des Mahlbehälters verbunden ist gemäß dem Oberbegriff des beigefügten Hauptanspruches.The invention relates to an agitator ball mill with a grinding container and an axially extending agitator shaft which is connected at at least one end to the wall of the grinding container via a rotary feedthrough. According to the preamble of the attached main claim.

Es ist bekannt, dass Rührwerkskugelmühlen eingesetzt werden, um die Feststoffe flüssiger, disperser Systeme bzw. Suspensionen zu zerkleinern.It is known that agitator ball mills are used to comminute the solids of liquid, disperse systems or suspensions.

Sie bestehen üblicherweise aus vertikal und horizontal angeordneten zylindrischen Behältern, die meist zu 60 bis 80 Vol.-% mit Mahlkörpern gefüllt sind. Diese Mahlkörper sind meistens Kugeln aus Stahl, aus Glas oder aus keramischen Materialien.They usually consist of vertically and horizontally arranged cylindrical containers which are usually 60 to 80% by volume filled with grinding media. These grinding media are mostly balls made of steel, glass or ceramic materials.

Innerhalb des Mahlbehälters ist die axial angeordnete Rührwelle zu finden, auf der Rührelemente wie Scheiben oder Stäbe verdrehfest angeordnet sind. Durch eine Rotation dieser Rührwelle wird eine intensive Bewegung der Mahlkörper bewirkt.The axially arranged agitator shaft can be found inside the grinding container, on which agitator elements such as disks or rods are arranged in a rotationally fixed manner. The rotation of this stirrer shaft causes the grinding media to move intensively.

Es ist dabei auch bekannt, zur Erhöhung der Prall- oder Scherkräfte an der radial außen liegenden Wandung des Mahlbehälters mit den Rührelementen kämmende Gegenelemente bzw. Gegenstäbe vorzusehen.It is also known to provide counter-elements or counter-bars that mesh with the agitating elements on the radially outer wall of the grinding container to increase the impact or shear forces.

Die genannte Suspension wird bei gleichzeitiger Rotation der Rührwelle durch den Mahlbehälter der Rührwerkskugelmühle gepumpt, wobei die Feststoffpartikel innerhalb der Suspension durch die auf sie wirkenden Prall- und Scherkräfte zerkleinert werden, die durch die Mahlkörper erzeugt werden.Said suspension is pumped through the grinding container of the agitator ball mill with simultaneous rotation of the agitator shaft, the solid particles within the suspension being comminuted by the impact and shear forces acting on them, which are generated by the grinding media.

Am Austritt des Mahlbehälters ist dann eine geeignete Vorrichtung vorgesehen, durch die die Mahlkörper im Mahlbehälter gehalten werden, während die Suspension mit den darin befindlichen zerkleinerten Feststoffen austreten kann.A suitable device is then provided at the outlet of the grinding container, by means of which the grinding bodies are held in the grinding container while the suspension with the comminuted solids contained therein can exit.

Eine besondere Problematik ist unter konstruktiven Gesichtspunkten für den sicheren Betrieb einer Rührwerkskugelmühle die Abdichtung der Drehdurchführung am Eintritt der Rührwerkskugelwelle in den Mahlbehälter. Hier besteht nämlich die Gefahr, dass Mahlkörper die hier vorhandenen Drehdurchführungen beschädigen, sei es durch Aufprall oder aber durch Reibung. Besonders hoch ist diese Gefahr, wenn für die Drehdurchführung Gleitringdichtungen Verwendung finden.A particular problem from a structural point of view for the safe operation of an agitator ball mill is the sealing of the rotary leadthrough at the entry of the agitator ball shaft into the grinding container. There is a risk here that grinding media will damage the rotating unions present here, be it through impact or through friction. This risk is particularly high when mechanical seals are used for the rotary feedthrough.

Um diese Drehdurchführung zu schützen wird benachbart zu der Drehdurchführung im Mahlbehälter eine die Drehdurchführung abdeckende Schutzscheibe angeordnet. Entsprechende Vorrichtungen sind bekannt aus der DE 10 2008 058 585 A1 , der EP 0 074 633 B1 oder der US 5 330 112 A .In order to protect this rotary leadthrough, a protective disk covering the rotary leadthrough is arranged in the grinding container adjacent to the rotary leadthrough. Corresponding devices are known from DE 10 2008 058 585 A1 , of the EP 0 074 633 B1 or the U.S. 5,330,112 A .

DE 10 2008 058 585 A1 offenbart dabei eine Rührwerkskugelmühle gemäß dem Oberbegriff des Anspruchs 1. Aufgrund dieser Schutzscheibe wird mit einer konstruktiv einfach Maßnahme ein effektiver Schutz der Drehdurchführung gewährleistet. Die Mahlkörper werden durch diese Schutzscheibe daran gehindert, in mechanischen Kontakt mit der Drehdurchführung zu kommen und diese hat somit eine längere Standzeit. Es ergibt sich dabei von selbst, dass der axiale Abstand der Schutzscheibe von der Drehdurchführung grundsätzlich so gewählt ist, dass er kleiner ist als ein üblicher Mahlkörper. So kann zwischen Schutzscheibe und Drehdurchführung kein Mahlkörper gelangen. DE 10 2008 058 585 A1 discloses an agitator ball mill according to the preamble of claim 1. Due to this protective disk, an effective protection of the rotary leadthrough is ensured with a structurally simple measure. This protective disk prevents the grinding media from coming into mechanical contact with the rotating union, which means that it has a longer service life. It follows naturally that the axial distance between the protective disk and the rotary feedthrough is basically chosen so that it is smaller than a conventional grinding body. This means that no grinding media can get between the protective disk and the rotating union.

Aufgabe der vorliegenden Erfindung ist es daher, bisher bekannte Rührwerkskugelmühlen weiterzubilden.The object of the present invention is therefore to develop previously known agitator ball mills.

Die Rührwerkskugelmühle gemäß der Erfindung wird durch Anspruch 1 definiert. Bei einer erfindungsgemäßen Ausführungsform ist die Schutzscheibe an der Rührwelle befestigt. Hierdurch kann die Position der Schutzscheibe innerhalb des Mahlbehälters gut fixiert werden, ohne dass dabei eine den Durchsatz von Mahlgut behindernde Befestigung für die Schutzscheibe vorgesehen werden muss. Erfindungsgemäß ist vorgesehen, dass die Schutzscheibe auf ihrer der Drehdurchführung zugewandten Seite mit im Wesentlichen in Radialrichtung verlaufenden Förderflügeln versehen ist. Durch die damit erzeugte Strömung von eintretender Suspension zunächst in Radialrichtung und dann an der Schutzscheibe vorbei in Axialrichtung wird eine besonders gute Förderwirkung für Suspension durch den Mahlbehälter erzeugt. Hierzu ist bekannt, dass die Suspension in Axialrichtung, .d. h. parallel zu der Richtung der Rührwelle in den Mahlbehälter eingeführt wird.The agitator ball mill according to the invention is defined by claim 1. In one embodiment according to the invention, the protective disk is attached to the agitator shaft. As a result, the position of the protective disk can be fixed well within the grinding container without having to provide a fastening for the protective disk that would hinder the throughput of ground material. According to the invention it is provided that the protective disk is provided on its side facing the rotary feedthrough with conveyor vanes extending essentially in the radial direction. The resulting flow of incoming suspension, first in the radial direction and then past the protective disk in the axial direction, produces a particularly good conveying effect for suspension through the grinding container. For this purpose it is known that the suspension in the axial direction, .d. H. is introduced into the grinding container parallel to the direction of the agitator shaft.

Durch einen konvergenten Ringspalt, der am Umfang der Schutzscheibe zwischen dieser und der um sie umlaufenden Wandung des Mahlbehälters vorhanden ist, kann einerseits ein gleichmäßiger Eintrag von Suspension in den Mahlbehälter gewährleistet werden. Zum anderen werden aber durch diesen konvergenten Ringspalt grobe Agglomerationen von festen Materialien in der Suspension zusätzlich aufgebrochen, wofür die Scherspannungen innerhalb der Suspension genutzt werden können, die auftreten beim Durchtritt der Suspension durch den genannten konvergenten Spalt. - Es versteht sich auch hier, dass die radialen Abmessungen des konvergenten Spaltes insbesondere an seinem dem Inneren des Mahlbehälters zugewandten Ende so gewählt sind, dass Mahlkörper mit ihren üblichen Maßen nicht in den Spalt eindringen können.A convergent annular gap, which is present on the circumference of the protective disk between it and the surrounding wall of the grinding container, can ensure, on the one hand, that suspension is fed evenly into the grinding container. On the other hand, this convergent annular gap also breaks up coarse agglomerations of solid materials in the suspension, for which purpose the shear stresses within the suspension that occur when the suspension passes through said convergent gap can be used. It goes without saying that the radial dimensions of the convergent gap, in particular at its end facing the interior of the grinding container, are selected so that grinding bodies with their usual dimensions cannot penetrate the gap.

Bei der Erfindung ist der Mahlbehälter an seiner Wandung mit einer Kugelentleerung versehen, die im Bereich der dem Mahlbehälter zugewandten Seite der Schutzscheibe liegt. Über diese relative Anordnung ist zu gewährleisten, dass bei Bedarf die innerhalb der Rührwerkskugelmühle vorhandenen Mahlkörper vollständig aus dem Mahlbehälter entnommen und gegebenenfalls durch unverschlissene ersetzt werden können.In the invention, the grinding container is provided with a ball drain on its wall, which is located in the area of the side of the protective disk facing the grinding container. This relative arrangement must ensure that, if necessary, the grinding media present within the agitator ball mill can be completely removed from the grinding container and, if necessary, replaced by unworn ones.

Weitere Vorteile und Merkmale der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels. Dabei zeigt

Figur 1:
die teilweise aufgeschnittene Seitenansicht einer erfindungsgemäßen Kugelmühle;
Figur 2:
den Kugelauslass einer Kugelmühle gemäß dem Detail II in Figur 1.
Further advantages and features of the invention emerge from the following description of an exemplary embodiment. It shows
Figure 1:
the partially cut-away side view a ball mill according to the invention;
Figure 2:
the ball outlet of a ball mill according to detail II in Figure 1 .

In Figur 1 erkennt man die Seitenansicht einer Rührwerkskugelmühle. Über einen Elektromotor 1 wird unter Zwischenschaltung eines in einem Getriebekasten 2 angeordneten Getriebes eine vertikal angeordnete Rührwelle 3 angetrieben. Diese Rührwelle ist mit in Axialrichtung ausgerichteten Rührelementen in Form von Stäben 4 besetzt, die mit Gegenstäben 5 kämmen, die an der Wandung 6 des Mahlbehälters 7 angeordnet sind und radial nach innen ragen. Die Wandung 6 ist dabei zweischalig ausgebildet, so dass sie einen Kühlmantel 8 bildet, in den durch einen Kühlwassereingang 9 Kühlwasser eingeleitet und aus einem Kühlwasserausgang 10 dieses wieder abgeleitet wird.In Figure 1 you can see the side view of an agitator ball mill. A vertically arranged agitator shaft 3 is driven via an electric motor 1 with the interposition of a gear arranged in a gear box 2. This agitator shaft is equipped with agitating elements aligned in the axial direction in the form of rods 4 which mesh with counter rods 5 which are arranged on the wall 6 of the grinding container 7 and project radially inward. The wall 6 is designed with two shells, so that it forms a cooling jacket 8, into which cooling water is introduced through a cooling water inlet 9 and is discharged again from a cooling water outlet 10.

Auch die Rührwelle 3 ist entsprechend gekühlt ausgebildet.The agitator shaft 3 is also designed to be correspondingly cooled.

Zwischen den Stäben 4 und den Gegenstäben 5 ist das Innere des Mahlbehälters 7 zum größten Teil mit Mahlkörpern 11 gefüllt, die ein Volumen von 60 bis 80 % des freien Raumes im Mahlbehälter 7 einnehmen.Between the rods 4 and the counter-rods 5, the interior of the grinding container 7 is for the most part filled with grinding bodies 11 which take up a volume of 60 to 80% of the free space in the grinding container 7.

Durch das Innere des Mahlbehälters 7 wird nun eine Suspension gepumpt. Durch die dabei gleichzeitig durchgeführte Rotation der Rührwelle 3 werden dabei die Mahlkörper 11 in Bewegung gesetzt, wobei die Feststoffpartikel in der genannten Suspension durch die Prall- und Scherkräfte der dabei aufeinander-prallenden Mahlkörper zerkleinert werden.A suspension is now pumped through the interior of the grinding container 7. As a result of the simultaneous rotation of the agitator shaft 3, the grinding media 11 are set in motion, the solid particles in the suspension mentioned being comminuted by the impact and shear forces of the grinding media that collide with one another.

Am oberen Ende des Mahlbehälters findet sich dann ein Ringspalt 12, durch den die Suspension mit den zerkleinerten Feststoffpartikeln hindurchtritt, um durch einen Suspensionsaustritt 13 den Mahlbehälter 7 zu verlassen. Durch dessen Abmessungen, insbesondere die lichte Weite des Ringspalts 12 wird dabei verhindert, dass dabei auch die Mahlkörper aus dem Mahlbehälter 11 ausgetragen werden.At the upper end of the grinding container there is an annular gap 12 through which the suspension with the comminuted solid particles passes in order to leave the grinding container 7 through a suspension outlet 13. Its dimensions, in particular the clear width of the annular gap 12, prevent the grinding media from being discharged from the grinding container 11.

Wesentlich ist jetzt allerdings der Bereich, in dem die Rührwelle 3 an einer Drehdurchführung 14 durch die Wandung, insbesondere den Boden 15 des Mahlbehälters 7 hindurchgeführt wird.What is now essential, however, is the area in which the agitator shaft 3 is guided through the wall, in particular the bottom 15 of the grinding container 7, on a rotary feedthrough 14.

Bei der hier dargestellten erfindungsgemäßen Ausführungsform ist in diesem Bereich an der Rührwerkswelle 3 eine Schutzscheibe 16 vorgesehen. Diese erstreckt sich in Radialrichtung über die eigentliche Drehdurchführung 14 und verhindert so, dass einzelne Mahlkörper 11 auf die Drehdurchführung 14 aufschlagen und diese beschädigen können.In the embodiment according to the invention shown here, a protective disk 16 is provided on the agitator shaft 3 in this area. This extends in the radial direction over the actual rotary leadthrough 14 and thus prevents individual grinding media 11 from hitting the rotary leadthrough 14 and damaging it.

Bei der hier dargestellten Erfindung ist die Schutzscheibe 16 einstückig mit der Rührwelle 3 ausgebildet und weist außerdem auf ihrer der Drehdurchführung 14 zugewandten Seite in Radialrichtung verlaufende Förderflügel 17 auf. Mit diesen Förderflügeln 17 wird Suspension, die parallel zur Achse der Rührwelle 3 durch ein Zuführrohr 18 in den Mahlbehälter 7 eintritt, wie mit einem Pumpenrad einer Zentrifugalpumpe in den Mahlbehälter 3 hineingefördert. Dabei wird diese Suspension, nach dem Austreten aus dem Zuführrohr 18 in Radialrichtung umgelenkt und wird dann, wie dies in der Figur 2 zu erkennen ist, durch einen in Axialrichtung ausgerichteten konvergenten Spalt 19 gedrückt, wodurch die Suspension speziell beschleunigt und damit einer Scherung unterzogen wird, was zu einer Aufspaltung von Agglomerationen von Partikeln innerhalb der Suspension führt. Die in Radialrichtung liegende lichte Weite des konvergenten Spaltes ist dabei so gewählt, dass sie an dem dem Inneren des Mahlbehälters 7 zugewandten Ende des Ringspaltes kleiner ist als ein übliches Maß eines Mahlkörpers 11. Hierdurch wird ein unerwünschtes Eindringen von Mahlkörpern 11 in den Spalt 19 und damit auch in den Raum zwischen Schutzscheibe 16 und Drehdurchführung 14 verhindert und die Drehdurchführung 14 ist so sicher vor einem durch Mahlkörper an ihr verursachten Verschleiß geschützt.In the invention shown here, the protective disk 16 is formed in one piece with the agitator shaft 3 and also has conveying vanes 17 extending in the radial direction on its side facing the rotary leadthrough 14. With these conveying vanes 17, suspension which enters the grinding container 7 parallel to the axis of the agitator shaft 3 through a feed pipe 18 is conveyed into the grinding container 3 as with a pump wheel of a centrifugal pump. This suspension is deflected in the radial direction after exiting the feed pipe 18 and is then, as shown in FIG Figure 2 can be seen, pressed through a convergent gap 19 aligned in the axial direction, as a result of which the suspension is specifically accelerated and thus subjected to shear, which leads to a breakdown of agglomerations of particles within the suspension. The clear width of the convergent gap lying in the radial direction is selected so that it is smaller at the end of the annular gap facing the interior of the grinding container 7 than a conventional size of a grinding body 11. This prevents undesired penetration of grinding bodies 11 into the gap 19 and thus also prevented in the space between the protective disk 16 and the rotary leadthrough 14 and the rotary leadthrough 14 is thus reliably protected from wear caused by grinding media.

Oberhalb der Schutzscheibe 16 fluchtet diese mit ihrer Oberseite 20, mit der Unterkante 21 einer Kugelentleeröffnung 22. Diese Kugelentleeröffnung 22 ist in der Wandung 6 des Mehlbehälters 7 vorgesehen und kann durch einen Stopfen 23 verschlossen werden. Bei einer Entfernung dieses Stopfens 23 können durch die Kugelentleeröffnung 22 die in dem Mahlbehälter 7 vorhandenen Mahlkörper 11 zu einem Auswechseln entnommen werden.Above the protective disk 16, it is aligned with its upper side 20, with the lower edge 21 of a ball emptying opening 22. This ball emptying opening 22 is provided in the wall 6 of the flour container 7 and can be closed by a plug 23. When this plug 23 is removed, the grinding bodies 11 present in the grinding container 7 can be removed for replacement through the ball emptying opening 22.

Wesentlich bei der Erfindung ist auch, dass durch die Schutzscheibe 16 die Drehdurchführung 14 geschützt wird und somit die Rührwerkskugelmühle betriebssicherer auszuführen ist.It is also essential in the invention that the rotary feedthrough 14 is protected by the protective disk 16 and thus the agitator ball mill can be designed to be more reliable.

Der guten Ordnung halber sei noch erwähnt, dass es außerdem möglich ist, eine Rührwelle an beiden Enden mit Drehdurchführungen am Mahlbehälter 7 zu lagern, wobei dann gegebenenfalls auch für eine weitere Drehdurchführung eine entsprechende Schutzscheibe an der Rührwelle vorzusehen wäre.For the sake of clarity, it should also be mentioned that it is also possible to mount an agitator shaft at both ends with rotary feedthroughs on the grinding container 7, in which case a corresponding protective disk would also have to be provided on the agitator shaft for a further rotary feedthrough.

Claims (2)

  1. An agitator ball mill with a grinding container (7) and an agitator shaft (3) extending axially within it, which is connected at at least one end to the wall (15) of the grinding container (7) via a rotary bushing (14), wherein arranged adjacent to the rotary bushing (14) in the grinding container (7) there is a protective plate (16) covering the rotary bushing (14), which is fastened to the agitator shaft (3) and is provided with impeller blades (17) extending in the radial direction,
    with that the impeller blades (17) being arranged on the side of the protective plate (16) directed towards the rotary bushing (14) in order thus to produce a flow of incoming suspension initially in the radial direction and then past the protective plate (16) in the axial direction through the grinding container (7) characterized in that
    provided in the wall (6) of the grinding container (7) there is a drain opening (22) corresponding with the protective plate (16).
  2. An agitator ball mill as claimed in Claim 1, characterised in that between the protective plate (16) and the surrounding wall (6) of the grinding container (7) there is a convergent annular gap (19).
EP12000233.2A 2011-02-07 2012-01-17 Stirring-typ ball mill Active EP2484450B2 (en)

Applications Claiming Priority (1)

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DE102011010527A DE102011010527A1 (en) 2011-02-07 2011-02-07 stirred ball mill

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EP2484450A3 EP2484450A3 (en) 2016-04-20
EP2484450B1 EP2484450B1 (en) 2017-05-03
EP2484450B2 true EP2484450B2 (en) 2020-08-19

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Publication number Priority date Publication date Assignee Title
DE102013111564B3 (en) * 2013-10-21 2015-02-12 Netzsch-Feinmahltechnik Gmbh DEVICE AND METHOD FOR STARTING AN ORIENTED BALL MILL
DE102015105103A1 (en) * 2015-04-02 2016-10-06 Netzsch-Feinmahltechnik Gmbh Closure system for the grinding container of a comminution device and grinding container with such a closure system and comminution device with a grinding container
DE102021101527B4 (en) * 2021-01-25 2023-05-17 Wilhelm Niemann Gmbh & Co. agitator mill

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2308821A1 (en) † 1972-05-09 1973-11-29 Jun Edward Henry Cumpston DEVICE FOR MIXING AND CRUSHING MATERIAL OF HIGH VISCOSITY
DE3716587C1 (en) † 1987-05-18 1988-04-28 Draiswerke Gmbh Agitator mill
DE4332549A1 (en) † 1992-10-19 1994-04-21 Buehler Ag Agitator grinding mill with grinding container of conical inner contour - has material inlet aperture(s) in container region of greatest periphery and outlet aperture(s) in region of smallest periphery
EP1468739B1 (en) † 2003-04-15 2008-03-19 Willy A. Bachofen AG Agitator ball mill

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3136323A1 (en) 1981-09-12 1983-03-31 Boehringer Mannheim Gmbh, 6800 Mannheim METHOD FOR OPERATING A BALL MILL AND CORRESPONDING BALL MILL
JP2566884Y2 (en) 1992-05-27 1998-03-30 三井鉱山株式会社 Crusher
DE102008058585A1 (en) 2008-11-22 2010-05-27 Netzsch-Feinmahltechnik Gmbh stirred ball mill

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2308821A1 (en) † 1972-05-09 1973-11-29 Jun Edward Henry Cumpston DEVICE FOR MIXING AND CRUSHING MATERIAL OF HIGH VISCOSITY
DE3716587C1 (en) † 1987-05-18 1988-04-28 Draiswerke Gmbh Agitator mill
DE4332549A1 (en) † 1992-10-19 1994-04-21 Buehler Ag Agitator grinding mill with grinding container of conical inner contour - has material inlet aperture(s) in container region of greatest periphery and outlet aperture(s) in region of smallest periphery
EP1468739B1 (en) † 2003-04-15 2008-03-19 Willy A. Bachofen AG Agitator ball mill

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Vorbenutzung Rührwerkskugelmühle LME 300 K †

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DE102011010527A1 (en) 2012-08-09
EP2484450B1 (en) 2017-05-03
EP2484450A2 (en) 2012-08-08

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