EP0146852B1 - Agitator mill - Google Patents

Agitator mill Download PDF

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Publication number
EP0146852B1
EP0146852B1 EP84114919A EP84114919A EP0146852B1 EP 0146852 B1 EP0146852 B1 EP 0146852B1 EP 84114919 A EP84114919 A EP 84114919A EP 84114919 A EP84114919 A EP 84114919A EP 0146852 B1 EP0146852 B1 EP 0146852B1
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EP
European Patent Office
Prior art keywords
agitator
cavity
grinding
shaft
separating means
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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.)
Expired
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EP84114919A
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German (de)
French (fr)
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EP0146852A1 (en
Inventor
Giacomo Dr. Canepa
Klaus Ott
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Erich Netzsch GmbH and Co Holding KG
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Erich Netzsch GmbH and Co Holding KG
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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
    • B02C17/161—Arrangements for separating milling media and ground material

Definitions

  • the separating device In a known agitator mill of this type (SU-A-737004), which is designed as a vertical agitator mill with a vertical agitator shaft, the separating device consists of a cylindrical screen basket which is arranged as an upper extension of the grinding chamber around the agitator shaft.
  • the bottom of the grinding bowl is bowl-shaped and has its deepest area immediately below the open inner shaft end. Grinding bodies that settle in this area are carried upwards into the cavity of the agitator shaft by a flow that forms during operation, pass through the recesses, which are arranged radially, back into the grinding area and are activated by bowl-shaped agitating elements that surround the device the cutouts are arranged on the agitator shaft.
  • an uppermost stirring element in the form of an inverted bowl is arranged in order to guide grinding media downward from the upper region of the grinding chamber. Due to the general, bottom-up flow of regrind, this top stirring element cannot prevent the sieve basket from being constantly hit by grinding media that have been activated directly by the stirrer shaft or by the top stirring element and therefore impact the sieve basket with great kinetic energy , so that it wears out quickly.
  • the invention is therefore based on the object of designing an agitator mill in such a way that its separating device is largely removed from the impact of grinding bodies activated directly by the agitator shaft and nevertheless does not tend to clog.
  • the object is achieved according to the invention in an agitator mill of the type described in the introduction in that the separating device is arranged at least essentially within the cavity.
  • the invention has the advantage that the separating device, whatever it may be in the individual, is protected within the cavity open at the end in the end section of the agitator shaft, so that grinding media activated directly by the agitator shaft have hardly any possibility of impacting the separating device . Nevertheless, the risk of the separating device becoming clogged is avoided by the rotation of the agitator shaft.
  • At least one conveying element is preferably formed on the agitator shaft, which promotes an axial flow of grinding media and grinding stock from the inner shaft end through the cavity to the recesses.
  • the conveying element can be formed by the wall of the cavity itself, for example in that the cavity widens conically away from the inner shaft end.
  • the separating device is preferably arranged at least approximately coaxially with the agitator shaft. Depending on the position of the agitator shaft in the room and on the type and nature of the material to be ground, it may also be expedient if the separating device is arranged parallel or at an angle to the axis of the agitator shaft.
  • the separating device can be arranged on a tube which extends through part of the grinding chamber from the inner shaft end into the cavity.
  • the separating device can be installed and removed particularly easily together with the tube.
  • the pipe is expediently guided to be pulled outward in a pipe socket which extends from an end wall of the grinding container into the cavity.
  • the tube is guided to be pulled outwards in a sleeve which is arranged on an end wall of the grinding container and is adjustable between a normal operating position, in which it is arranged essentially outside the grinding chamber, and a position for exchanging the Separating device in which the sleeve protrudes into the cavity and seals off the agitator shaft in a manner that restricts the grinding media.
  • the separating device is connected through the generally hollow stirring shaft to the regrind outlet, which is arranged at an outer shaft end.
  • the separating device can have a tubular sieve cartridge.
  • the separating device can be fastened to the agitator shaft and circulate with it.
  • the separation device has two per se Known, coaxial with the agitator shaft, forming an annular gap on separating disks, one of which is rotatable and the other is arranged in a fixed position.
  • the lying agitator mill shown in FIGS. 1 to 3 has a box-shaped frame 10 on which a substantially cylindrical grinding container 12 and axially next to this a bearing housing 14 are fastened.
  • the frame 10 contains a drive motor, not shown, and is connected to the bearing housing 14 by a gear housing 16, in which a gear, also not shown, with an adjustable transmission ratio is arranged.
  • the grinding container 12 contains a circular cylindrical grinding chamber 18 in which an agitator 20 is arranged.
  • the agitator 20 consists essentially of an agitator shaft 22 which is mounted in the bearing housing 14 and extends coaxially with the grinding container 12 through almost the entire grinding chamber 18, and a number of rod-shaped stirring elements 24 which are attached to the agitator shaft 22 at equal axial intervals and protrude into spaces between counter-bars 26 attached to the grinding container 12.
  • a grinding material inlet 28 through which a suspension or slurry of grinding material and liquid is continuously pumped into the grinding chamber 18 during operation.
  • a grinding material outlet 30 is arranged, through which the finished grinding material is continuously pumped out.
  • the regrind outlet 30 is formed by a threaded connector at the end of a tube 32 to which a flange 34 is attached.
  • the flange 34 is screwed to a cover which forms an end wall 36 of the grinding container 12 facing away from the gear housing 16.
  • the tube 32 extends - coaxially with the stirring shaft 22 in the example shown - through the end wall 36 and the adjacent area of the grinding chamber 18 to an end section 38 of the stirring shaft 22.
  • the end section 38 is detachably screwed to the main part of the stirring shaft 22 and points a cavity 40 open at the end or end, in which a separating device 42 is arranged.
  • the separating device 42 is formed by a cylindrical sieve cartridge which has the same diameter as the tube 32 and consists of one piece with it.
  • the separator 42 extends coaxially with the agitator shaft 22 over the greater part of the length of the cavity 40 and has a closed end 44, the distance from the axially inner end of the cavity 40 as well as the radial width of the annular space between the cylindrical part of the filter cartridge and Inner wall of the end portion 38 corresponds to approximately 15 to 20% of the diameter of the cavity 40.
  • slot-shaped, axially parallel recesses 46 are machined, each of which has an annular sector-shaped cross section and extend over the greater part of the length of the cavity 40, so that the filter cartridge 42 is enclosed by these recesses almost over its entire length.
  • the recesses 46 extend in the shape of an annular sector over an angular range of 45 ° in each case and allow webs 48 of the same cross-section to stand between them, so that the end section 38 as a whole resembles a cylindrical cage which is open at one end face.
  • Three of the rod-shaped stirring elements 24 are fastened to each of the webs 48, so that the end section 38 is completely comparable with the main part of the stirring shaft 22 with regard to the fitting with stirring elements.
  • the agitator shaft 22 rotates, depending on its diameter and the nature of the material to be ground, at a speed which is customary in agitator mills in the order of magnitude of, for example, 200 to 3000 revolutions per minute, as a result of which the mixture of grinding media 50 and material to be ground 52 contained in the grinding chamber 18 is activated becomes.
  • a vacuum is generated in the tube 32 by a pump device, not shown, which allows the grinding media 50 and grinding stock 52 to flow from the grinding chamber 18 into the cavity 40.
  • the finished grinding material passes through the sieve cartridge 42 into the tube 32, while the grinding media 50 are retained and flow back into the grinding chamber 18 through the cutouts 46. This backflow. Mung is promoted by centrifugal forces resulting from the action of the webs 48 and the stirring elements 24 attached to them on the grinding media 50.
  • FIG. 4 shows a simplified axial section of an embodiment in which the separating device 42 is also designed as a sieve cartridge and is arranged in the cavity 40 of the end section 38 of the stirring shaft 22.
  • the separating device 42 is fastened to the end of a tube 54 which extends through the bearing housing 14 (FIG. 1) within the overall hollow stirrer shaft 22 and is connected there to a regrind outlet which is the regrind outlet 30 shown in FIGS. 1 and 3 replaced.
  • FIGS. 5 and 6 are comparable in their overall arrangement with FIG. 2; here too, the separating device 42 is arranged on a tube 32 which extends through part of the grinding chamber 18. However, the separating device 42 is formed by two annular cutting disks 56 and 58 which are arranged coaxially with the agitator shaft 22
  • the cutting disc 56 is attached to the agitator shaft 22 and rotates with it; the cutting disc 58 is attached to the tube 32 and is therefore stationary.
  • Fig. 7 shows a modification which differs from Fig. 5 and 6 in that the two cutting discs 56 and 58 are approximately the same size and axially opposed to each other, so that they form a substantially flat, radial annular gap 60.
  • the cutting discs 56 and 58 could also be conical and delimit a conical annular gap between them.
  • FIG. 8 and 9 show two further embodiments in which the separating device 42, which is likewise formed by two separating disks 56 and 58 and is arranged in the cavity 40, has no component rotating with the agitator shaft 22.
  • the rotatable cutting disc 56 is fastened to a shaft 62 which is arranged coaxially within the tube 32 with the agitator shaft 22 and can be driven by its own motor 64 which is flanged to the end wall 36.
  • the stationary cutting disc 58 is in each case attached to the tube 32, as shown in FIG. 8 radially outside the rotating disc 56; 9, however, axially next to this.
  • a conveying element 66 is arranged around the separating device 42, which is again formed here by a sieve cartridge, which has the shape of a spiral and is fastened within the cavity 40 to the end section 38 of the agitator shaft 22.
  • the conveying element 66 is coiled in such a way that it conveys grinding media 50 and regrind 52 within the cavity 40 from its open end, ie to the left in FIG. 10, when the agitator shaft 22 is driven in its operating direction of rotation.
  • the sieve cartridge which forms the separating device 42, is flowed around substantially uniformly by grinding media 50 and grinding stock 52.
  • the inner wall of the hollow end portion 38 widens in a truncated cone shape away from the open end of the cavity 40.
  • this design has the effect that the centrifugal forces acting on the grinding body 50 and the material to be ground 52 generate propulsive forces in the direction of the expansion of the cavity 40, that is to say away from its open end.
  • the inner wall of the end section 38 thus itself forms a conveying element 66.
  • the separating device 42 which in turn is formed by a sieve cartridge, expands in a manner corresponding to the cavity 40, but only to a diameter which is somewhat smaller than the smallest inner diameter of the cavity 40, so that as in all other embodiments, the separating device 42 can be pulled axially out of the end section 38 and replaced.
  • the conveyor elements 66 shown in FIGS. 10 and 11 can be combined with one another.
  • a pipe socket 68 is arranged on the end wall 36 or a comparable end part of the grinding container 12 according to FIG Screening cartridge trained separator 42 is pulled out.
  • the pipe socket 68 projects into an extension 70 of the cavity 40, but ends at or shortly before the start of the recesses 46, so that it does not hinder the flow of grinding media 50 and regrind 52 through the cavity 40 and the recesses 46 during normal operation .
  • a sleeve 72 can be provided according to FIGS. 13 and 14, which is axially adjustably guided on the end wall 36 and / or a holder 74 fastened to it.
  • 13 shows the normal operating position, in which the sleeve 72 does not protrude into the grinding chamber 18 or only protrudes slightly.
  • the sleeve 72 can be moved into a position in which it engages in a recess 76 in the end section 38, as a result of which the interior of the sleeve 72 is completely sealed off from the surrounding cavity 40 and from the grinding chamber 18. In this position, the sleeve 72 can be fastened so that the separating device 42 can be replaced while the agitator shaft 22 is running, without grinding media 50 or grinding stock 52 being able to flow out.

Description

Die Erfindung betrifft eine Rührwerksmühle mit

  • einem Mahlbehälter, der einen mindestens teilweise mit Mahlkörpern und Mahlgut füllbaren Mahlraum enthält und einen Mahlguteinlaß sowie einen Mahlgutauslaß aufweist,
  • einer Rührwelle, die ein inneres Wellenende im Mahlraum aufweist,
  • und einer Trennvorrichtung, die fertig bearbeitetes Mahlgut aus dem Mahlraum zum Mahlgutauslaß abströmen läßt, Mahlkörper jedoch zurückhält,
  • wobei die Rührwelle einen Endabschnitt mit einem am inneren Wellenende offenen Hohlraum aufweist, und
  • der Endabschnitt der Rührwelle im Abstand vom inneren Wellenende rings um den Hohlraum Aussparungen aufweist, die durch das innere Wellenende in den Hohlraum gelangte Mahlkörper in den Mahlraum zurückströmen lassen.
The invention relates to an agitator mill
  • a grinding container which contains a grinding chamber which can be at least partially filled with grinding media and grinding material and has a grinding material inlet and a grinding material outlet,
  • an agitator shaft which has an inner shaft end in the grinding chamber,
  • and a separating device which allows finished millbase to flow out of the grinding chamber to the millbase outlet, but holds back grinding media,
  • wherein the agitator shaft has an end section with a cavity open at the inner shaft end, and
  • the end section of the agitator shaft at a distance from the inner shaft end around the cavity has cutouts which allow grinding media which have entered the cavity through the inner shaft end to flow back into the grinding chamber.

Bei einer bekannten Rührwerksmühle dieser Gattung (SU-A-737004), die' als stehende Rührwerksmühle - mit senkrechter Rührwelle - ausgebildet ist, besteht die Trennvorrichtung aus einem zylindrischen Siebkorb, der als obere Verlängerung des Mahlraums rings um die Rührwelle angeordnet ist. Der Boden des Mahlbehälters ist schüsselförmig und hat seinen tiefsten Bereich unmittelbar unterhalb des offenen inneren Wellenendes. Mahlkörper, die sich in diesem Bereich absetzen, werden von einer sich im Betrieb ausbildenden Strömung nach oben in den Hohlraum der Rührwelle getragen, gelangen durch deren Aussparungen, die radial angeordnet sind, wieder in den Mahlraum und werden von schüsselförmigen Rührelementen aktiviert, die rings um die Aussparungen an der Rührwelle angeordnet sind. Unmittelbar unter einer Ebene, die sich im rechten Winkel zur Rührwelle erstreckt und den unteren Rand des Siebkorbes enthält, ist ein oberstes Rührelement in Form einer umgekehrten Schüssel angeordnet, um Mahlkörper aus dem oberen Bereich des Mahlraums nach unten zu lenken. Wegen der allgemeinen, von unten nach oben gerichteten Mahlgutströmung kann dieses oberste RühreJement jedoch nicht verhindern, daß der Siebkorb im Betrieb ständig von Mahlkörpern getroffen wird, die unmittelbar von der Rührwelle oder vom obersten Rührelement aktiviert worden sind und deshalb mit großer Bewegungsenergie auf den Siebkorb aufprallen, so daß dieser rasch verschleißt.In a known agitator mill of this type (SU-A-737004), which is designed as a vertical agitator mill with a vertical agitator shaft, the separating device consists of a cylindrical screen basket which is arranged as an upper extension of the grinding chamber around the agitator shaft. The bottom of the grinding bowl is bowl-shaped and has its deepest area immediately below the open inner shaft end. Grinding bodies that settle in this area are carried upwards into the cavity of the agitator shaft by a flow that forms during operation, pass through the recesses, which are arranged radially, back into the grinding area and are activated by bowl-shaped agitating elements that surround the device the cutouts are arranged on the agitator shaft. Immediately below a plane that extends at right angles to the agitator shaft and contains the lower edge of the strainer basket, an uppermost stirring element in the form of an inverted bowl is arranged in order to guide grinding media downward from the upper region of the grinding chamber. Due to the general, bottom-up flow of regrind, this top stirring element cannot prevent the sieve basket from being constantly hit by grinding media that have been activated directly by the stirrer shaft or by the top stirring element and therefore impact the sieve basket with great kinetic energy , so that it wears out quickly.

Der Erfindung liegt deshalb die Aufgabe zugrunde, eine Rührwerksmühle derart zu gestalten, daß ihre Trennvorrichtung dem Aufprall von unmittelbar durch die Rührwelle aktivierten Mahlkörpern weitgehend entzogen ist und dennoch nicht zum Zusetzen neigt.The invention is therefore based on the object of designing an agitator mill in such a way that its separating device is largely removed from the impact of grinding bodies activated directly by the agitator shaft and nevertheless does not tend to clog.

Die Aufgabe ist bei einer Rührwerksmühle der eingangs beschriebenen Gattung erfindungsgemäß dadurch gelöst, daß die Trennvorrichtung mindestens im wesentlichen innerhalb des Hohlraums angeordnet ist.The object is achieved according to the invention in an agitator mill of the type described in the introduction in that the separating device is arranged at least essentially within the cavity.

Die Erfindung hat den Vorteil, daß die Trennvorrichtung, wie immer sie im einzelnen beschaffen sein mag, innerhalb des stirnseitig offenen Hohlraumes im Endabschnitt der Rührwelle geschützt angeordnet ist, so daß unmittelbar von der Rührwelle aktivierte Mahlkörper kaum eine Möglichkeit haben, gegen die Trennvorrichtung zu prallen. Dennoch wird die Gefahr, daß die Trennvorrichtung sich zusetzt, durch die Drehung der Rührwelle vermieden.The invention has the advantage that the separating device, whatever it may be in the individual, is protected within the cavity open at the end in the end section of the agitator shaft, so that grinding media activated directly by the agitator shaft have hardly any possibility of impacting the separating device . Nevertheless, the risk of the separating device becoming clogged is avoided by the rotation of the agitator shaft.

An der Rührwelle ist vorzugsweise mindestens ein Förderelement ausgebildet, das eine axiale Strömung von Mahlkörpern und Mahlgut vom inneren Wellenende durch den Hohlraum hindurch zu den Aussparungen begünstigt. Das Förderelement kann von der Wand des Hohlraums selbst gebildet sein, beispielweise dadurch, daß der Hohlraum sich vom inneren Wellenende weg kegelförmig erweitert.At least one conveying element is preferably formed on the agitator shaft, which promotes an axial flow of grinding media and grinding stock from the inner shaft end through the cavity to the recesses. The conveying element can be formed by the wall of the cavity itself, for example in that the cavity widens conically away from the inner shaft end.

Die Trennvorrichtung ist vorzugsweise mindestens annähernd gleichachsig mit der Rührwelle angeordnet. Je nach Lage der Rührwerkswelle im Raum und je nach Art und Beschaffenheit des Mahlguts kann es auch zweckmäßig sein, wenn die Trennvorrichtung parallel oder unter einem Winkel zur Achse der Rührwelle angeordnet ist.The separating device is preferably arranged at least approximately coaxially with the agitator shaft. Depending on the position of the agitator shaft in the room and on the type and nature of the material to be ground, it may also be expedient if the separating device is arranged parallel or at an angle to the axis of the agitator shaft.

Die Trennvorrichtung kann an einem Rohr angeordnet sein, das sich durch einen Teil des Mahlraums hindurch vom inneren Wellenende her in den Hohlraum erstreckt. Bei dieser Ausführungsform der Erfindung läßt sich die.Trennvorrichtung zusammen mit dem Rohr besonders leicht ein- und ausbauen.The separating device can be arranged on a tube which extends through part of the grinding chamber from the inner shaft end into the cavity. In this embodiment of the invention, the separating device can be installed and removed particularly easily together with the tube.

Zweckmäßigerweise ist das Rohr nach außen herausziehbar in einem Rohrstutzen geführt, der sich von einer Stirnwand des Mahlbehälters in den Hohlraum erstreckt.The pipe is expediently guided to be pulled outward in a pipe socket which extends from an end wall of the grinding container into the cavity.

Es ist es auch vorteilhaft, wenn das Rohr nach außen herausziehbar in einer Hülse geführt ist, die an einer Stirnwand des Mahlbehälters angeordnet und verstellbar ist zwischen einer normalen Betriebsstellung, in der sie im wesentlichen außerhalb des Mahlraums angeordnet ist, und einer Stellung zum Auswechseln der Trennvorrichtung in der die Hülse in den Hohlraum hineinragt und in einer die Mahlkörper zurückhaltenden Weise gegen die Rührwelle abdichtet.It is also advantageous if the tube is guided to be pulled outwards in a sleeve which is arranged on an end wall of the grinding container and is adjustable between a normal operating position, in which it is arranged essentially outside the grinding chamber, and a position for exchanging the Separating device in which the sleeve protrudes into the cavity and seals off the agitator shaft in a manner that restricts the grinding media.

Bei einer anderen Ausführungsform der Erfindung ist die Trennvorrichtung, unabhängig davon, wie sie im einzelnen gestaltet ist, durch die insgesamt hohle Rührwelle hindurch mit dem Mahlgutauslaß verbunden, der an einem äußeren Wellenende angeordnet ist.In another embodiment of the invention, the separating device, regardless of how it is designed in detail, is connected through the generally hollow stirring shaft to the regrind outlet, which is arranged at an outer shaft end.

Beim Gegenstand der Erfindung kann ebenso wie bei der eingangs beschriebenen bekannten Rührwerksmühle die Trennvorrichtung eine rohrförmige Siebpatrone aufweisen. In diesem Fall kann die Trennvorrichtung an der Rührwelle befestigt sein und mit ihr umlaufen.In the subject of the invention, just as in the known agitator mill described at the outset, the separating device can have a tubular sieve cartridge. In this case, the separating device can be fastened to the agitator shaft and circulate with it.

Bei alternativen Ausführungsformen der Erfindung weist die Trennvorrichtung zwei an sich bekannte, gleichachsig mit der Rührwelle angeordnete, einen Ringspalt bildende Trennscheiben auf, von denen eine drehbar und die andere ortsfest angeordnet ist.In alternative embodiments of the invention, the separation device has two per se Known, coaxial with the agitator shaft, forming an annular gap on separating disks, one of which is rotatable and the other is arranged in a fixed position.

Ausführungsbeispiele der Erfindung werden im folgenden anhand schematischer Zeichnungen mit weiteren Einzelheiten beschrieben. Es zeigt :

  • Figur 1 eine Seitenansicht einer liegenden Rührwerksmühle,
  • Figur 2 einen vergrößerten Axialschnitt eines Teils der Rührwerksmühle,
  • Figur 3 den Teil-Querschnitt 111-111 in Fig. 2 und
  • Figur 4 bis 14 Abwandlungen von Fig. 2.
Exemplary embodiments of the invention are described below with the aid of schematic drawings with further details. It shows :
  • FIG. 1 shows a side view of a horizontal agitator mill,
  • FIG. 2 shows an enlarged axial section of part of the agitator mill,
  • Figure 3 shows the partial cross section 111-111 in Fig. 2 and
  • Figure 4 to 14 modifications of Fig. 2nd

Die in Fig. 1 bis 3 dargestellte liegende Rührwerksmühle hat ein kastenförmiges Gestell 10, auf dem ein im wesentlichen zylindrischer Mahlbehälter 12 sowie axial neben diesem ein Lagergehäuse 14 befestigt sind. Das Gestell 10 enthält einen nicht dargestellten Antriebsmotor und ist mit dem Lagergehäuse 14 durch ein Getriebegehäuse 16 verbunden, in dem ein ebenfalls nicht dargestelltes Getriebe mit einstellbarem Übersetzungsverhältnis angeordnet ist.The lying agitator mill shown in FIGS. 1 to 3 has a box-shaped frame 10 on which a substantially cylindrical grinding container 12 and axially next to this a bearing housing 14 are fastened. The frame 10 contains a drive motor, not shown, and is connected to the bearing housing 14 by a gear housing 16, in which a gear, also not shown, with an adjustable transmission ratio is arranged.

Der Mahlbehälter 12 enthält einen kreiszylindrischen Mahlraum 18, in dem ein Rührwerk 20 angeordnet ist. Das Rührwerk 20 besteht im wesentlichen aus einer Rührwelle 22, die im Lagergehäuse 14 gelagert ist und sich gleichachsig mit dem Mahlbehälter 12 durch nahezu den gesamten Mahlraum 18 erstreckt, sowie einer Anzahl stabförmiger Rührelemente 24, die in gleichen axialen Abständen an der Rührwelle 22 befestigt sind und in Zwischenräume zwischen am Mahlbehälter 12 befestigten Gegenstäben 26 hineinragen.The grinding container 12 contains a circular cylindrical grinding chamber 18 in which an agitator 20 is arranged. The agitator 20 consists essentially of an agitator shaft 22 which is mounted in the bearing housing 14 and extends coaxially with the grinding container 12 through almost the entire grinding chamber 18, and a number of rod-shaped stirring elements 24 which are attached to the agitator shaft 22 at equal axial intervals and protrude into spaces between counter-bars 26 attached to the grinding container 12.

Am linken Ende des Mahlbehälters 12 ist ein Mahlguteinlaß 28 angeordnet, durch den im Betrieb eine Suspension oder Aufschlämmung aus Mahlgut und Flüssigkeit kontinuierlich in den Mahlraum 18 gepumpt wird. An der vom Mahlguteinlaß 28 abgewandten, in Fig. 1 und 2 rechts angeordneten Stirnseite des Mahlbehälters 12 ist ein Mahlgutauslaß 30 angeordnet, durch den fertig bearbeitetes Mahlgut ständig abgepumpt wird. Der Mahlgutauslaß 30 ist von einem Gewindestutzen am Ende eines Rohrs 32 gebildet, an dem ein Flansch 34 befestigt ist. Der Flansch 34 ist mit einem Deckel verschraubt, der eine vom Getriebegehäuse 16 abgewandte Stirnwand 36 des Mahlbehälters 12 bildet.At the left end of the grinding container 12 there is a grinding material inlet 28 through which a suspension or slurry of grinding material and liquid is continuously pumped into the grinding chamber 18 during operation. On the end of the grinding container 12 facing away from the grinding material inlet 28 and on the right in FIGS. 1 and 2, a grinding material outlet 30 is arranged, through which the finished grinding material is continuously pumped out. The regrind outlet 30 is formed by a threaded connector at the end of a tube 32 to which a flange 34 is attached. The flange 34 is screwed to a cover which forms an end wall 36 of the grinding container 12 facing away from the gear housing 16.

Das Rohr 32 erstreckt sich - im dargestellten Beispiel gleichachsig mit der Rührwelle 22 - durch die Stirnwand 36 und den angrenzenden Bereich des Mahlraums 18 hindurch bis zu einem Endabschnitt 38 der Rührwelle 22. Der Endabschnitt 38 ist lösbar mit dem Hauptteil der Rührwelle 22 verschraubt und weist einen stirn- oder endseitig offenen Hohlraum 40 auf, in dem eine Trennvorrichtung 42 angeordnet ist.The tube 32 extends - coaxially with the stirring shaft 22 in the example shown - through the end wall 36 and the adjacent area of the grinding chamber 18 to an end section 38 of the stirring shaft 22. The end section 38 is detachably screwed to the main part of the stirring shaft 22 and points a cavity 40 open at the end or end, in which a separating device 42 is arranged.

Die Trennvorrichtung 42 ist bei dem Ausführungsbeispiel gemäß Fig. 1 bis 3 von einer zylindrischen Siebpatrone gebildet, die den gleichen Durchmesser hat wie das Rohr 32 und mit diesem aus einem Stück besteht. Die Trennvorrichtung 42 erstreckt sich gleichachsig mit der Rührwelle 22 über den größeren Teil der Länge des Hohlraums 40 und hat ein geschlossenes Ende 44, dessen Abstand vom axial inneren Ende des Hohlraums 40 ebenso wie die radiale Breite des Ringraumes zwischen dem zylindrischen Teil der Siebpatrone und der Innenwand des Endabschnitts 38 ungefähr 15 bis 20% des Durchmessers des Hohlraums 40 entspricht.In the exemplary embodiment according to FIGS. 1 to 3, the separating device 42 is formed by a cylindrical sieve cartridge which has the same diameter as the tube 32 and consists of one piece with it. The separator 42 extends coaxially with the agitator shaft 22 over the greater part of the length of the cavity 40 and has a closed end 44, the distance from the axially inner end of the cavity 40 as well as the radial width of the annular space between the cylindrical part of the filter cartridge and Inner wall of the end portion 38 corresponds to approximately 15 to 20% of the diameter of the cavity 40.

In den Endabschnitt 38 sind schlitzförmige, achsparallele Aussparungen 46 eingearbeitet, die je einen kreisringsektorförmigen Querschnitt haben und sich über den größeren Teil der Länge des Hohlraums 40 erstrecken, so daß die Siebpatrone 42 nahezu auf ihrer gesamten Länge von diesen Aussparungen umschlossen ist. Im Querschnitt gemäß Fig. 3 erstrecken sich die Aussparungen 46 kreisringsektorförmig über je einen Winkelbereich von 45° und lassen zwischen sich Stege 48 von gleichem Querschnitt stehen, so daß der Endabschnitt 38 insgesamt einem zylindrischen Käfig ähnelt, der an seiner einen Stirnseite offen ist. An jedem der Stege 48 sind drei der stabförmigen Rührelemente 24 befestigt, so daß der Endabschnitt 38 hinsichtlich der Bestückung mit Rührelementen vollständig mit dem Hauptteil der Rührwelle 22 vergleichbar ist.In the end section 38, slot-shaped, axially parallel recesses 46 are machined, each of which has an annular sector-shaped cross section and extend over the greater part of the length of the cavity 40, so that the filter cartridge 42 is enclosed by these recesses almost over its entire length. In the cross-section according to FIG. 3, the recesses 46 extend in the shape of an annular sector over an angular range of 45 ° in each case and allow webs 48 of the same cross-section to stand between them, so that the end section 38 as a whole resembles a cylindrical cage which is open at one end face. Three of the rod-shaped stirring elements 24 are fastened to each of the webs 48, so that the end section 38 is completely comparable with the main part of the stirring shaft 22 with regard to the fitting with stirring elements.

Im Betrieb dreht sich die Rührwelle 22, abhängig von ihrem Durchmesser und der Beschaffenheit des Mahlguts, mit einer bei Rührwerksmühlen üblichen Drehzahl in der Größenordnung von beispielsweise 200 bis 3000 Umdrehungen pro Minute, wodurch das im Mahlraum 18 enthaltene Gemisch aus Mahlkörpern 50 und Mahlgut 52 aktiviert wird. Im Rohr 32 wird durch eine nicht dargestellte Pumpeinrichtung ein Unterdruck erzeugt, der Mahlkörper.50 und Mahlgut 52 aus dem Mahlraum 18 in den Hohlraum 40 strömen läßt. Das fertig bearbeitete Mahlgut gelangt durch die Siebpatrone 42 in das Rohr 32, während die Mahlkörper 50 zurückgehalten werden und durch die Aussparungen 46 in den Mahlraum 18 zurückströmen. Diese Rückströ- . mung wird durch Zentrifugalkräfte gefördert, die aus der Einwirkung der Stege 48 und der an diesen befestigten Rührelemente 24 auf die Mahlkörper 50 resultieren.In operation, the agitator shaft 22 rotates, depending on its diameter and the nature of the material to be ground, at a speed which is customary in agitator mills in the order of magnitude of, for example, 200 to 3000 revolutions per minute, as a result of which the mixture of grinding media 50 and material to be ground 52 contained in the grinding chamber 18 is activated becomes. A vacuum is generated in the tube 32 by a pump device, not shown, which allows the grinding media 50 and grinding stock 52 to flow from the grinding chamber 18 into the cavity 40. The finished grinding material passes through the sieve cartridge 42 into the tube 32, while the grinding media 50 are retained and flow back into the grinding chamber 18 through the cutouts 46. This backflow. Mung is promoted by centrifugal forces resulting from the action of the webs 48 and the stirring elements 24 attached to them on the grinding media 50.

Fig. 4 zeigt einen vereinfachten Axialschnitt einer Ausführungsform, bei der die Trennvorrichtung 42 ebenfalls als Siebpatrone ausgebildet und im Hohlraum 40 des Endabschnitts 38 der Rührwelle 22 angeordnet ist. Hier ist die Trennvorrichtung 42 jedoch am Ende eines Rohrs 54 befestigt, das sich innerhalb der insgesamt hohlen Rührwelle 22 durch das Lagergehäuse 14 (Fig. 1) hindurcherstreckt und dort an einen Mahlgutauslaß angeschlossen ist, der den in Fig. 1 und 3 dargestellten Mahlgutauslaß 30 ersetzt.FIG. 4 shows a simplified axial section of an embodiment in which the separating device 42 is also designed as a sieve cartridge and is arranged in the cavity 40 of the end section 38 of the stirring shaft 22. Here, however, the separating device 42 is fastened to the end of a tube 54 which extends through the bearing housing 14 (FIG. 1) within the overall hollow stirrer shaft 22 and is connected there to a regrind outlet which is the regrind outlet 30 shown in FIGS. 1 and 3 replaced.

Die in Fig. 5 und 6 dargestellten Ausführungsformen sind in ihrer Gesamtanordnung mit Fig. 2 vergleichbar; auch hier ist die Trennvorrichtung 42 an einem Rohr 32 angeordnet, das sich durch einen Teil des Mahlraums 18 hindurcherstreckt. Die Trennvorrichtung 42 ist jedoch von zwei ringförmigen Trennscheiben 56 und 58 gebildet, die mit der Rührwelle 22 gleichachsig angeordnetThe embodiments shown in FIGS. 5 and 6 are comparable in their overall arrangement with FIG. 2; here too, the separating device 42 is arranged on a tube 32 which extends through part of the grinding chamber 18. However, the separating device 42 is formed by two annular cutting disks 56 and 58 which are arranged coaxially with the agitator shaft 22

sind und zwischen sich einen zylindrischen Ringspalt 60 begrenzen. Die Trennscheibe 56 ist an der Rührwelle 22 befestigt und dreht sich mit ihr ; die Trennscheibe 58 ist am Rohr 32 befestigt und ist dadurch ortsfest.are and define a cylindrical annular gap 60 between them. The cutting disc 56 is attached to the agitator shaft 22 and rotates with it; the cutting disc 58 is attached to the tube 32 and is therefore stationary.

Gemäß Fig. 5 ist die ortsfeste Trennscheibe 58 radial außerhalb der drehbaren Trennscheibe 56 angeordnet; gemäß Fig. 6 ist es umgekehrt.5, the fixed cutting wheel 58 is arranged radially outside the rotating cutting wheel 56; 6 is the reverse.

Fig. 7 zeigt eine Abwandlung, die sich von Fig. 5 und 6 dadurch unterscheidet, daß die beiden Trennscheiben 56 und 58 ungefähr gleich groß sind und einander axial gegenüberstehen, so daß sie einen im wesentlichen ebenen, radialen Ringspalt 60 bilden. Die Trennscheiben 56 und 58 könnten auch kegelförmig sein und einen ebenfalls kegelförmigen Ringspalt zwischen sich begrenzen.Fig. 7 shows a modification which differs from Fig. 5 and 6 in that the two cutting discs 56 and 58 are approximately the same size and axially opposed to each other, so that they form a substantially flat, radial annular gap 60. The cutting discs 56 and 58 could also be conical and delimit a conical annular gap between them.

In Fig. 8 und 9 sind zwei weitere Ausführungsformen dargestellt, bei denen die ebenfalls von zwei Trennscheiben 56 und 58 gebildete, im Hohlraum 40 angeordnete Trennvorrichtung 42 kein mit der Rührwelle 22 umlaufendes Bauteil hat. Die drehbare Trennscheibe 56 ist an einer Welle 62 befestigt, die innerhalb des Rohrs 32 gleichachsig mit der Rührwelle 22 angeordnet und von einem eigenen Motor 64 antreibbar ist, der an die Stirnwand 36 angeflanscht ist. Die ortsfeste Trennscheibe 58 ist jeweils am Rohr 32 befestigt, gemäß Fig. 8 radial außerhalb der umlaufenden Scheibe 56 ; gemäß Fig. 9 dagegen axial neben dieser.8 and 9 show two further embodiments in which the separating device 42, which is likewise formed by two separating disks 56 and 58 and is arranged in the cavity 40, has no component rotating with the agitator shaft 22. The rotatable cutting disc 56 is fastened to a shaft 62 which is arranged coaxially within the tube 32 with the agitator shaft 22 and can be driven by its own motor 64 which is flanged to the end wall 36. The stationary cutting disc 58 is in each case attached to the tube 32, as shown in FIG. 8 radially outside the rotating disc 56; 9, however, axially next to this.

Gemäß Fig. 10 ist rings um die Trennvorrichtung 42, die hier wieder von einer Siebpatrone gebildet ist, ein Förderelement 66 angeordnet, das die Form einer Wendel hat und innerhalb des Hohlraums 40 am Endabschnitt 38 der Rührwelle 22 befestigt ist. Das Förderelement 66 ist derart gewendelt, daß es Mahlkörper 50 und Mahlgut 52 innerhalb des Hohlraums 40 von dessen offenem Ende weg, in Fig. 10 also nach links, fördert, wenn die Rührwelle 22 in ihrer Betriebsdrehrichtung angetrieben wird. Infolgedessen wird die Siebpatrone, welche die Trennvorrichtung 42 bildet, von Mahlkörpern 50 und Mahlgut 52 im wesentlichen gleichmäßig umströmt.According to FIG. 10, a conveying element 66 is arranged around the separating device 42, which is again formed here by a sieve cartridge, which has the shape of a spiral and is fastened within the cavity 40 to the end section 38 of the agitator shaft 22. The conveying element 66 is coiled in such a way that it conveys grinding media 50 and regrind 52 within the cavity 40 from its open end, ie to the left in FIG. 10, when the agitator shaft 22 is driven in its operating direction of rotation. As a result, the sieve cartridge, which forms the separating device 42, is flowed around substantially uniformly by grinding media 50 and grinding stock 52.

Gemäß Fig. 11 erweitert sich die Innenwand des hohlen Endabschnitts 38 kegelstumpfförmig vom offenen Ende des Hohlraums 40 weg. Diese Gestaltung bewirkt bei sich drehender Rührwelle 22, daß die auf Mahlkörper 50 und Mahlgut 52 einwirkenden Zentrifugalkräfte Vortriebskräfte in Richtung der Erweiterung des Hohlraums 40, also von dessen offenem Ende weg, erzeugen. Die Innenwand des Endabschnitts 38 bildet somit selber ein Förderelement 66. Die wiederum von einer Siebpatrone gebildete Trennvorrichtung 42 erweitert sich in entsprechender Weise wie der Hohlraum 40, jedoch nur auf einen Durchmesser, der etwas kleiner als der kleinste Innendurchmesser des Hohlraums 40 ist, so daß die Trennvorrichtung 42 ebenso wie bei allen anderen Ausführungsformen axial aus dem Endabschnitt 38 herausgezogen und ausgewechselt werden kann.11, the inner wall of the hollow end portion 38 widens in a truncated cone shape away from the open end of the cavity 40. When the agitator shaft 22 rotates, this design has the effect that the centrifugal forces acting on the grinding body 50 and the material to be ground 52 generate propulsive forces in the direction of the expansion of the cavity 40, that is to say away from its open end. The inner wall of the end section 38 thus itself forms a conveying element 66. The separating device 42, which in turn is formed by a sieve cartridge, expands in a manner corresponding to the cavity 40, but only to a diameter which is somewhat smaller than the smallest inner diameter of the cavity 40, so that as in all other embodiments, the separating device 42 can be pulled axially out of the end section 38 and replaced.

Die in Fig. 10 und 11 dargestellten Förderelemente 66 können miteinander kombiniert werden.The conveyor elements 66 shown in FIGS. 10 and 11 can be combined with one another.

Damit die Trennvorrichtung 42 bei laufender Rührwerksmühle, jedoch bei abgeschalteter Pumpeinrichtung, ausgewechselt werden kann, ohne daß Mahlkörper 50 herausfallen, ist gemäß Fig. 12 an der Stirnwand 36 oder einem vergleichbaren Abschlußteil des Mahlbehälters 12 ein Rohrstutzen 68 angeordnet, in dem die auch hier als Siebpatrone ausgebildete Trennvorrichtung 42 herausziehbar geführt ist. Der Rohrstutzen 68 ragt in eine Erweiterung 70 des Hohlraums 40 hinein, endet jedoch am oder kurz vor dem Beginn der Aussparungen 46, so daß er im normalen Betrieb die Strömung von Mahlkörpern 50 und Mahlgut 52 durch den Hohlraum 40 und die Aussparungen 46 hindurch nicht behindert.So that the separating device 42 can be replaced while the agitator mill is running, but with the pump device switched off, without grinding bodies 50 falling out, a pipe socket 68 is arranged on the end wall 36 or a comparable end part of the grinding container 12 according to FIG Screening cartridge trained separator 42 is pulled out. The pipe socket 68 projects into an extension 70 of the cavity 40, but ends at or shortly before the start of the recesses 46, so that it does not hinder the flow of grinding media 50 and regrind 52 through the cavity 40 and the recesses 46 during normal operation .

Anstelle des in Fig. 12 dargestellten ortsfesten Rohrstutzens 68 kann gemäß Fig. 13 und 14 eine Hülse 72 vorgesehen sein, die an der Stirnwand 36 und/oder einer an dieser befestigten Halterung 74 axial verstellbar geführt ist. Fig. 13 zeigt die normale Betriebsstellung, in der die Hülse 72 nicht oder nur geringfügig in den Mahlraum 18 hineinragt. Gemäß Fig. 14 läßt sich die Hülse 72 in eine Stellung verschieben, in der sie in eine Ausdrehung 76 des Endabschnitts 38 eingreift, wodurch das Innere der Hülse 72 vollständig dicht von dem umgebenden Hohlraum 40 und vom Mahlraum 18 abgetrennt wird. In dieser Stellung läßt sich die Hülse 72 befestigen, so daß die Trennvorrichtung 42 bei laufender Rührwelle 22 ausgewechselt werden kann, ohne daß Mahlkörper 50 oder Mahlgut 52 ausströmen können.Instead of the stationary pipe socket 68 shown in FIG. 12, a sleeve 72 can be provided according to FIGS. 13 and 14, which is axially adjustably guided on the end wall 36 and / or a holder 74 fastened to it. 13 shows the normal operating position, in which the sleeve 72 does not protrude into the grinding chamber 18 or only protrudes slightly. 14, the sleeve 72 can be moved into a position in which it engages in a recess 76 in the end section 38, as a result of which the interior of the sleeve 72 is completely sealed off from the surrounding cavity 40 and from the grinding chamber 18. In this position, the sleeve 72 can be fastened so that the separating device 42 can be replaced while the agitator shaft 22 is running, without grinding media 50 or grinding stock 52 being able to flow out.

Claims (11)

1. An agitator mill comprising
a milling body (12) which includes a grinding chamber (18) to be filled at least partly with grinding media (50) and material (52) to be ground and has an inlet (28) for material to be ground and an outlet (30) for processed material,
an agitator shaft (22) having an inner shaft end inside the grinding chamber (18),
and a separating means (42) permitting finished processed material (52) to flow out of the grinding chamber (18) to the outlet (30) for processed material, yet retaining grinding media (50),
wherein the agitator shaft (22) has an end portion (38) formed with a cavity (40) which is open at the inner shaft end, and
the end portion (38) of the agitator shaft (22) includes recesses (46) which are distributed around the cavity (40) and spaced from the inner shaft end and permit grinding media (50) which entered the cavity (40) through the inner shaft end to flow back into the grinding chamber (18) characterized in that the separating means (42) is arranged at least substantially inside the cavity (40).
2. The agitator mill as claimed in claim 1, characterized in that at least one conveying member (66) is formed at the agitator shaft (22) to promote axial flow of grinding media (50) and material (52) to be ground from the inner shaft end through the cavity (40) to the recesses (46).
3. The agitator mill as claimed in claim 2, characterized in that the cavity (40) diverges frusticonically away from the inner shaft end.
4. The agitator mill as claimed in one of claims 1 to 3, characterized in that the separating means (42) is arranged at least approximately coaxially with the agitator shaft (22).
5. The agitator mill as claimed in claim 4, characterized in that the separating means (42) is arranged on a tube (32) which extends through part of the grinding chamber (18) from the inner shaft end into the cavity (40).
6. The agitator mill as claimed in claim 5, characterized in that the tube (32) is guided so as to be pulled out to the exterior in a tubular socket (68) which extends from an end face (36) of the milling body (12) into the cavity (40).
7. The agitator mill as claimed in claim 5, characterized in that the tube (32) is guided so as to be pulled out to the exterior in a sleeve (72) which is arranged at an end wall (36) of the milling body (12) and is adjustable between a normal operating position in which it is disposed substantially outside of the grinding chamber (18) and a position for exchange of the separating means (42), at which position the sleeve (72) protrudes into the cavity (40) and affords sealing against the agitator shaft (22) in a manner to retain the grinding media (50).
8. The agitator mill as claimed in one of claims 1 to 6, characterized in that the separating means (42) communicates through the altogether hollow agitator shaft (22) with the outlet (30) for processed material disposed at an outer shaft end.
9. The agitator mill as claimed in claim 8, wherein the separating means (42) comprises a screen cartridge, characterized in that the separating means (42) is fixed to the agitator shaft (22) and rotates together with the same.
10. The agitator mill as claimed in one of claims 1 to 8, characterized in that the separating means (42) comprises per se known separating discs (56, 58) which are disposed coaxially with the agitator shaft (22) and define an annular gap (60) and of which one is rotatable while the other one is stationary.
EP84114919A 1983-12-16 1984-12-07 Agitator mill Expired EP0146852B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3345680 1983-12-16
DE19833345680 DE3345680A1 (en) 1983-12-16 1983-12-16 AGITATOR MILL

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EP0146852A1 EP0146852A1 (en) 1985-07-03
EP0146852B1 true EP0146852B1 (en) 1987-03-04

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JP (1) JPS61500715A (en)
DE (3) DE3345680A1 (en)
WO (1) WO1985002559A1 (en)

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DE2037258C3 (en) * 1970-07-28 1974-10-17 Draiswerke Gmbh, 6800 Mannheim Closed agitator mill
DE2110336A1 (en) * 1971-03-04 1972-09-07 Draiswerke Gmbh Agitator mill
CH564373A5 (en) * 1973-09-28 1975-07-31 Bicik Vladislav
DE2626757C2 (en) * 1975-07-09 1984-03-15 Meyer AG Zuchwil, Zuchwil Agitator mill, especially colloid mill
SU737004A2 (en) * 1978-03-01 1980-05-30 Среднеазиатский Филиал Специального Конструкторского Бюро Внпо "Союзгазавтоматика" Small-ball mill
JPS5836242A (en) * 1981-08-21 1983-03-03 津田駒工業株式会社 Method and apparatus for controlling jet timing of sub-nozzle in air jet loom
DE3245825C2 (en) * 1982-12-10 1994-01-27 Buehler Ag Geb Agitator mill
DE3345680A1 (en) * 1983-12-16 1985-06-20 Gebrüder Netzsch, Maschinenfabrik GmbH & Co, 8672 Selb AGITATOR MILL

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0206207A2 (en) * 1985-06-18 1986-12-30 Erich Netzsch GmbH & Co. Holding KG Agitator mill
EP0206207A3 (en) * 1985-06-18 1987-11-25 Gebruder Netzsch Maschinenfabrik Gmbh & Co Agitator mill
EP0260604A2 (en) * 1986-09-15 1988-03-23 Erich Netzsch GmbH & Co. Holding KG Agitator mill
EP0260604A3 (en) * 1986-09-15 1989-02-22 Erich Netzsch Gmbh & Co. Holding Kg Agitator mill
DE3716587C1 (en) * 1987-05-18 1988-04-28 Draiswerke Gmbh Agitator mill
WO1988009212A1 (en) * 1987-05-18 1988-12-01 Draiswerke Gmbh Stirring mill
US5062577A (en) * 1987-05-18 1991-11-05 Draiswerke Gmbh Agitator mill
AU616412B2 (en) * 1987-05-18 1991-10-31 Buhler Gmbh Stirring mill
EP0304062A2 (en) * 1987-08-20 1989-02-22 Erich Netzsch GmbH & Co. Holding KG Agitator mill with a feeding tube for disintegrating members
EP0304062A3 (en) * 1987-08-20 1990-01-10 Erich Netzsch GmbH & Co. Holding KG Agitator mill with a feeding tube for disintegrating members
WO1990007378A1 (en) * 1988-12-30 1990-07-12 Erich Netzsch Gmbh & Co. Holding Kg Tumbling mill with separating device in a rotating cage
EP0376001A1 (en) * 1988-12-30 1990-07-04 Erich Netzsch GmbH & Co. Holding KG Agitator mill with a separating device in a rotating cage
DE3844380C1 (en) * 1988-12-30 1990-01-18 Erich Netzsch Gmbh & Co Holding Kg, 8672 Selb, De Agitator mill with separating device in a rotating cage
DE4009092C1 (en) * 1990-03-21 1991-05-23 Erich Netzsch Gmbh & Co Holding Kg, 8672 Selb, De
EP0504836A1 (en) * 1991-03-21 1992-09-23 Erich Netzsch GmbH & Co. Holding KG Agitator mill
DE4109332A1 (en) * 1991-03-21 1992-09-24 Netzsch Erich Holding AGITATOR MILL
DE4240779C1 (en) * 1992-12-04 1994-02-10 Netzsch Erich Holding Mill with stirring action - has annular stator between stirring shaft and grinder-body separator with passages returning bodies to outer grinding chamber
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
US5566896A (en) * 1994-09-09 1996-10-22 Evv-Vermogensverwaltungs-Gmbh Agitator mill
US5624080A (en) * 1994-09-09 1997-04-29 Evv-Vermogensverwaltungs-Gmbh Agitator mill

Also Published As

Publication number Publication date
DE3345680C2 (en) 1988-03-10
DE3521668C2 (en) 1994-07-28
DE3521668A1 (en) 1986-12-18
DE3345680A1 (en) 1985-06-20
JPS61500715A (en) 1986-04-17
US4620673A (en) 1986-11-04
DE3462438D1 (en) 1987-04-09
EP0146852A1 (en) 1985-07-03
DE3521668C3 (en) 1994-07-28
JPH0210699B2 (en) 1990-03-09
WO1985002559A1 (en) 1985-06-20

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