EP1468739B1 - Agitator ball mill - Google Patents

Agitator ball mill Download PDF

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Publication number
EP1468739B1
EP1468739B1 EP04405182A EP04405182A EP1468739B1 EP 1468739 B1 EP1468739 B1 EP 1468739B1 EP 04405182 A EP04405182 A EP 04405182A EP 04405182 A EP04405182 A EP 04405182A EP 1468739 B1 EP1468739 B1 EP 1468739B1
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EP
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Prior art keywords
grinding
ball mill
agitator ball
agitator
separating
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EP04405182A
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German (de)
French (fr)
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EP1468739A1 (en
Inventor
Martin Heinzelmann
Stefan Spornberger
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Willy A Bachofen AG
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Willy A Bachofen AG
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Application filed by Willy A Bachofen AG filed Critical Willy A Bachofen AG
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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
    • B02C17/163—Stirring means
    • 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 invention relates to a stirred ball mill with a separating member having the features specified in the preamble of claim 1.
  • Agitated ball mills are used, for example, for the comminution and dispersion of solids in a liquid phase or for the digestion of microorganisms.
  • the housing of the grinding chamber of a stirred ball mill consists of a longitudinal wall and two arranged at the two ends of the longitudinal wall end walls. It has a good inlet serving for feeding the ground material and a good outlet serving for discharging the material.
  • a rotatable about the chamber axis agitator is also arranged to convey the grinding media located in the mill radially to the stirring shaft and thereby comminute the continuously passed through the grinding chamber Good by impact and shear forces or to disperse.
  • Agitator ball mills which have to solve this problem various constructions, in such a way that the entrained grinding bodies circulation in the mill is made possible with return to the grinding zone.
  • the known solutions are very often insufficient for grinding media D ⁇ 0.1 mm.
  • Clogging of the outlet can lead to a significant increase in pressure and prevent the actual grinding and dispersing process.
  • grinding media also comes out of the mill and the grinding and dispersing process increasingly deteriorates.
  • the millbase is contaminated with grinding media.
  • the centrifugal acceleration of the grinding media depends on the speed of the stirring disks and thus also on the property of the product, which, for example, in the case of shear-sensitive products and thus low rotational speeds may lead to a too low centrifugal acceleration of the grinding bodies or to the exit of the grinding bodies.
  • Vertical agitated ball mills also have the disadvantage of inhomogeneous media distribution in the milling chamber, resulting in poor grinding or dispersing performance.
  • the invention is based on the object to provide a horizontal axis agitator ball mill with a novel separating member which does not have the aforementioned disadvantages and with which a good can be gently and uniformly ground with KleinstmahlMechn having a diameter D ⁇ 0.1 mm, without that they leave the grinding room.
  • FIG. 1 a longitudinal section through a part of a horizontal grinding chamber with a separating member of the inventive type
  • FIG. 2a a cross section through the in the FIG. 1 represented separating element
  • FIG. 2b a section along the line IIb the FIG. 2a
  • FIG. 3 a longitudinal section through a second embodiment of the invention
  • FIG. 4 a plan view of an alternative embodiment of a separating member of the inventive type.
  • the in the FIG. 1 only partly shown and designated as a whole with 50 grinding chamber of a stirred ball mill has a housing 40 with a horizontal axis 60. Der Gezzausehelter 40 ist mit London Genosuse 40sky.
  • the housing 40 has an elongated, substantially cylindrical longitudinal wall 30 and two arranged at both ends of the longitudinal wall 30 end walls 35 and 36, of which the end wall 36 serving for supplying the material to be ground good inlet 37 and the end wall 35 a for discharging the Has good serving good outlet 38.
  • an agitator 1 is arranged, which has a plurality, for example two, along the axis 60 distributed, paddle wheel-like stirring elements 2.
  • the axis 60 coaxial shaft 4 of the agitator 1 is connected with its end wall 36 piercing end to a drive device, not shown in the drawing.
  • separating member 80 In the end wall 35 of the grinding chamber 50 is a coaxial with the axis 60 arranged separating member 80 which is connected to an external drive 18. This external drive 18 causes the separating member 80 in a rotational movement independent of the agitator 1.
  • the grinding stock outlet 38 leads coaxially to the axis 60 from the separating member 80 to the rotary feedthrough 17th
  • a seal 45 is provided in the end wall 35, which ensures that no regrind with grinding media from the annular gap between separating device 80 and end wall 35 penetrates through to the outside. This seal 45 complies with the requirements of the grinding media size ⁇ 0.1mm.
  • the separating member 80 has a seated on the shaft 9 and releasably secured to this circular disc 5 and the end wall 35 facing circular disc 7 with a coaxial with the axis 60 arranged, tubular Gut-outlet 38, which projects into the end wall 35 and in the rotary feedthrough 17 ends.
  • the two mutually parallel discs 5 and 7 of the separating member 80 are at a predetermined distance from each other. This is determined by a plurality of, around the disk center point symmetrically distributed, from the disk edge inwardly leading, in plan view arcuate conveying or wing elements 12. In the preferred embodiment according to the FIGS. 2a, 2b the circular disc 7 sits on the wing elements 12 and is connected via this with the disc 5 releasably or permanently.
  • a ring cage 10 may be further inserted with a screen plate ring 6 located on its outer surface.
  • the ring cage 10 is preferably pressed and sealed with O-rings 11 and can be mounted either with or without screen plate ring 6.
  • the choice of the use of the screen plate ring 6 can be adapted to the respective product properties.
  • a product to be ground or liquid to be dispersed in liquid form is continuously introduced into the interior 3 of the grinding chamber 50 through the inlet 37 and in the direction of arrow 71 and into the grinding stock outlet 38 transported.
  • These may, for example, primarily be products from nanotechnology, but also dye suspension, enamel paints, printing inks, agrochemicals, filler suspension, video tape coating composition, cosmetics, foodstuffs, pharmaceuticals or microorganisms.
  • the grinding media present in the interior 3 of the grinding chamber 50 grind and / or disperse during the operation of the stirred ball mill the product continuously passed through the grinding chamber 50, whereupon the product produced in the grinding chamber leaves the latter - in a continuous liquid flow - through the separating member 80 in the direction of arrow 72 ,
  • the use of small grinding media D ⁇ 0.1 mm is mainly used to break up the agglomerates and aggregates without destroying the primary particles.
  • rotating separator 80 is now designed and dimensioned so that the mixture formed from the grinding media and the ground and / or dispersed Good flows into the space between the two discs 5 and 7, whereupon due to the centrifugal force and the different specific gravity for grinding serving grinding media separated by the conveying elements 12 from the material to be ground and transported back into the interior 3 of the grinding chamber 50.
  • the millbase itself passes through the circular cavity 8 of the separating member 80 to the Gutauslauf 38, where it leaves the grinding chamber 50. Due to the rotation of the separating member 80, the product must overcome a relative pressure against the centrifugal force when flowing through this separating member.
  • This pressure which is between 0.5 and 3bar depending on the operating state, is applied by the feed pump (not shown).
  • the housing of the separating member 80 and also the seal 45 on the drive shaft 9 must be pressure-resistant, for the latter is In most cases, the use of a double mechanical seal is required.
  • the determining operating variables are the peripheral speed of the separating member 80 and the radial flow velocity in the flow channels.
  • the peripheral speed is determined by the speed.
  • the radial flow velocity results from the free cross section and the volume flow of the product through the pump.
  • the in the FIG. 3 shown grinding chamber 51 corresponds substantially to the grinding chamber according to FIG. 1 , That is, the separating element designated here by 82 is located opposite the agitator 22 on a separate drive shaft and the grinding stock outlet 39 leads coaxially to the axis 61 from the separating member 82 to the rotary feedthrough 17.
  • the drive 28 is arranged parallel to the axis 61 in this case and puts the separating shaft 83 bearing shaft via a sub / translation in an independent of the agitator 22 rotational movement.
  • a Siebabstreifer 65 is also provided in this variant, which serves to strip off at best on the sieve 6 fixed grinding media, so that no adverse pressure increase takes place and all grinding media can be returned by the rotational movement of the separating member 82 of the grinding chamber.
  • a vane-wheel-like separating element 85 which is shown in the view, differs from the separating elements 80 and 82 described above in that, between the arcuate vane elements 12, additionally straight or slightly curved conveying elements 86 are provided, which extend inwards from the edge of the disc. As a result, a secondary flow forms inside.
  • the separating members 80 and 82 are optionally provided with or without straight conveying elements 86, the conveying elements 12 and 86 either to the Slices 5 or 7 be attached and it can be equipped with or without screen plate ring 6, the separating elements.
  • the sizes of the separating elements are dependent on the peripheral speeds to be selected and can vary greatly from case to case.
  • stirring elements described above can numerically arbitrarily combined with each other and / or with other known stirrers and it may be additionally formed with pressure relief valves or the like, the grinding chamber to compensate for any pressure fluctuations, in particular pressure increases.
  • the longitudinal wall of the grinding chamber may be additionally enveloped by a cylindrical shell, which together with it defines a circular cross-section, a gap in the cooling or heating of the material present in the interior of a cooling or heating fluid can be introduced.

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

Abstract

The agitating ball mill has separating system formed from a separating component (80) which has two circular discs (5,7) co-axial to the chamber axis, and between which are installed several transporting or vane elements distributed symmetrically around the disc center point and leading inwards from the disc edge. During the operation of the separating device the transporting or vane elements create a back pressure on the material and milling body mix so by centrifugal force and different specific densities the milling bodies are separated from the product and transported back to the inner chamber (3) of the mill.

Description

Die Erfindung betrifft eine Rührwerkskugelmühle mit einem Trennorgan mit den im Oberbegriff des Anspruchs 1 angegebenen Merkmalen.The invention relates to a stirred ball mill with a separating member having the features specified in the preamble of claim 1.

Rührwerkskugelmühlen werden beispielsweise zur Zerkleinerung und Dispergierung von Feststoffen in einer Flüssigkeitsphase oder zum Aufschluss von Mikroorganismen verwendet.Agitated ball mills are used, for example, for the comminution and dispersion of solids in a liquid phase or for the digestion of microorganisms.

Auf dem Markt bekannte und für den kontinuierlichen Betrieb vorgesehene Rührwerkskugelmühlen besitzen eine zylindrische, horizontal- oder vertikalachsige Mahlkammer mit verschiedenartigen Trennorganen zum Abtrennen der Mahlkörper vom Produkt im Produktauslassbereich.Known on the market and intended for continuous operation agitator ball mills have a cylindrical, horizontal or vertical axis grinding chamber with various separation organs for separating the grinding media from the product in the Produktauslassbereich.

Das Gehäuse der Mahlkammer einer Rührwerkskugelmühle besteht aus einer Längswand und zwei an den beiden Enden der Längswand angeordneten Abschlusswänden. Es weist einen zum Zuführen des Mahlgutes dienenden Gut-Einlass und einen zum Abführen des Gutes dienenden Gut-Auslass auf. In der Mahlkammer ist zudem ein um die Kammerachse drehbares Rührwerk angeordnet, um die in der Mühle befindlichen Mahlkörper radial zur Rührwelle zu befördern und dadurch das kontinuierlich durch die Mahlkammer hindurchgeleitete Gut durch Stoss- und Scherkräfte zu zerkleinern bzw. zu dispergieren.The housing of the grinding chamber of a stirred ball mill consists of a longitudinal wall and two arranged at the two ends of the longitudinal wall end walls. It has a good inlet serving for feeding the ground material and a good outlet serving for discharging the material. In the grinding chamber, a rotatable about the chamber axis agitator is also arranged to convey the grinding media located in the mill radially to the stirring shaft and thereby comminute the continuously passed through the grinding chamber Good by impact and shear forces or to disperse.

Bei der kontinuierlichen Durchströmung einer Rührwerkskugelmühle tritt abhängig von der Strömungsgeschwindigkeit und von der Viskosität der Mahlgutsuspension eine Schleppkraft auf, die auf die Mahlkörper wirkt. Dadurch werden die Mahlkörper mit dem Mahlgut vom Eintritt in die Mahlzone bis zum Trennorgan im Bereich des Gut-Auslasses mitgeschleppt. Dies kann zu einer Verpressung der Mahlkörper vor dem Trennorgan führen, welche mit erhöhtem Verschleiss und erhöhter Verstopfungsgefahr verbunden ist. Bei Kleinstmahlkörpern mit einem Durchmesser D ≤ 0,1mm nimmt die Mitschleppwirkung des Produktes um ein Vielfaches zu und ist bei Feinstmahlungen und -dispergierungen insbesondere bei hohen Durchsatzraten kritisch.In the continuous flow through an agitator ball mill, depending on the flow velocity and on the viscosity of the millbase suspension, a drag force acts on the grinding bodies. This will be the Grinding medium entrained with the material to be ground from entry into the grinding zone to the separating element in the region of the good outlet. This can lead to a compression of the grinding media before the separating member, which is associated with increased wear and increased risk of clogging. In the case of very small grinding bodies with a diameter D ≤ 0.1 mm, the entrainment effect of the product increases by a multiple and is critical in the case of very fine grinding and dispersing, especially at high throughput rates.

Es sind Rührwerkskugelmühlen bekannt, die zur Lösung dieses Problems verschiedenste Konstruktionen aufweisen, in der Weise, dass den mitgeschleppten Mahlkörpern eine Zirkulation in der Mühle mit Rückführung in die Mahlzone ermöglicht wird. Die bekannten Lösungen sind aber für Mahlkörper D ≤ 0,1mm sehr oft ungenügend.Agitator ball mills are known, which have to solve this problem various constructions, in such a way that the entrained grinding bodies circulation in the mill is made possible with return to the grinding zone. However, the known solutions are very often insufficient for grinding media D ≦ 0.1 mm.

Bei weiteren bekannten Abtrennsystemen, wie zum Beispiel bei der Verwendung von sogenannten Spaltsiebpatronen, gestaltet sich die Fertigung mit kleinen Spaltweiten von ≤ 0,05mm als sehr schwierig, die zudem in der Praxis kaum brauchbar sind. Zudem ist in diesen Fällen die Wahrscheinlichkeit, dass das Sieb verstopft wird, sehr hoch, falls Mahlkörper mit D ≤ 0,1mm benützt werden müssen, was in der Nanotechnologie und somit auch in der Herstellung von Nanoteilchen nötig ist.In other known separation systems, such as in the use of so-called slit screen cartridges, the production with small gap widths of ≤ 0.05 mm designed as very difficult, which are also hardly usable in practice. In addition, in these cases, the likelihood that the screen is clogged, very high, if grinding media with D ≤ 0,1mm must be used, which is necessary in nanotechnology and thus also in the production of nanoparticles.

Ein weiteres Problem entsteht durch den hohen Druckverlust aufgrund der Anreicherung von Mahlkörpern auf dem Sieb. Bei der sogenannten Reibspaltausführung ist eine ausserordentlich hohe Präzision in der Herstellung erforderlich, um die kleinen Reibspalte von ≤ 0.05mm im ganzen Produktionsverlauf zu gewährleisten.Another problem arises from the high pressure loss due to the accumulation of grinding media on the screen. In the so-called Reibspaltausführung an extremely high precision in the production is required to ensure the small friction gaps of ≤ 0.05mm throughout the production process.

Aus der Offenlegungschrift DE 44 12 408 A1 ist es bekannt, in einer horizontalen Mühle die Mahlkörper zwar durch eine Vorklassierscheibe und einem rotierenden Käfig vom Auslasskörper zum Teil fernzuhalten, dennoch können durch die achsnahen Bohrungen in der Trenneinrichtung, durch die das Produkt hindurchströmen muss, Mahlkörper mitgeschleppt werden und somit zum Auslasskörper gelangen. Da die Mitschleppwirkung des Mahlgutes mit der Abnahme des Mahlkörperdurchmessers um ein Vielfaches zunimmt, ist für solche Anwendungen die Verwendung einer entsprechenden Abtrennvorrichtung, die die Mahlkörper wirksam und zuverlässig vom Produktgut trennt, somit unumgänglich.From the disclosure DE 44 12 408 A1 It is known, in a horizontal mill, the grinding media though Nevertheless, it is possible to entrain grinding bodies through the holes near the axis in the separating device, through which the product must flow, through a preclassifying disk and a rotating cage from the outlet body, and thus reach the outlet body. Since the entrainment action of the material to be ground increases with the decrease of the diameter of the grinding media by a multiple, the use of a corresponding separating device, which effectively and reliably separates the grinding media from the product goods, is therefore essential for such applications.

Eine Verstopfung des Auslasses, eventuell hervorgerufen durch die engen Toleranzen am Gut-Auslass, kann zu einem markanten Druckanstieg führen und den eigentlichen Mahl- und Dispergierprozess unterbinden. Bei Versagen der Abtrennfunktion treten zudem Mahlkörper aus der Mühle aus und der Mahlund Dispergierprozess verschlechtert sich zunehmend. Zudem wird in diesem Fall das Mahlgut mit Mahlkörpern verunreinigt.Clogging of the outlet, possibly caused by the tight tolerances at the product outlet, can lead to a significant increase in pressure and prevent the actual grinding and dispersing process. In case of failure of the separation function, grinding media also comes out of the mill and the grinding and dispersing process increasingly deteriorates. In addition, in this case, the millbase is contaminated with grinding media.

Weitere Vorschläge zur Vermeidung des Verstopfens der Trenneinrichtung werden hauptsächlich für vertikale Rührwerkskugelmühlen beschrieben. Eine solche Erfindung wird in Patent EP 0 771 591 A1 gezeigt. Dabei handelt es sich um eine vertikale Rührwerkskugelmühle, in welcher das Mahlgut einen von Mahlkörpern beschickten Mahlbehälter und einen auf dem Rührorgan vor dem Auslauf sitzenden Separator von unten nach oben durchströmt. Da der Separator kein Sieb, Filter oder anderes Mahlkörperrückhaltesystem besitzt, lässt sich diese Erfindung nicht bei einer horizontalachsigen Mühle verwenden, da beim Befüllen mit Mahlkörper bzw. beim Entleeren des Mahlgutes nach Beendigung des Mahlvorganges mit Mahlkörperaustritt beim Auslass zu rechnen ist, welcher das Mahlgut mit Mahlkörper verunreinigt. Ebenfalls ist die Zentrifugalbeschleunigung der Mahlkörper von der Geschwindigkeit der Rührscheiben abhängig und somit auch von der Eigenschaft des Produktes, was zum Beispiel bei scherempfindlichen Produkten und somit tiefen Drehzahlen zu einer zu geringen Zentrifugalbeschleunigung der Mahlkörper führen kann bzw. zum Austritt der Mahlkörper. Vertikale Rührwerkskugelmühlen weisen auch den Nachteil der inhomogenen Mahlkörperverteilung in der Mahlkammer auf, was zu einer schlechten Mahl- bzw. Diespergierleistung führt.Other proposals for preventing clogging of the separator are described primarily for vertical stirred ball mills. Such an invention is in Patent EP 0 771 591 A1 shown. This is a vertical agitator ball mill in which the material to be ground flows through a grinding container loaded with grinding media and a separator seated on the stirring element in front of the outlet from bottom to top. Since the separator has no sieve, filter or other Mahlkörperrückhaltesystem, this invention can not be used in a horizontal axis mill, since when filling with grinding material or when emptying the ground material after completion of the grinding process with Mahlkörperaustritt is expected at the outlet, which the regrind with Grinding media contaminated. Also, the centrifugal acceleration of the grinding media depends on the speed of the stirring disks and thus also on the property of the product, which, for example, in the case of shear-sensitive products and thus low rotational speeds may lead to a too low centrifugal acceleration of the grinding bodies or to the exit of the grinding bodies. Vertical agitated ball mills also have the disadvantage of inhomogeneous media distribution in the milling chamber, resulting in poor grinding or dispersing performance.

Eine gattungsbildende Vertikalmühle mit Mahlkörperrückhaltesystem ist aus DE 4 447 321 A1 bekannt.A generic vertical mill with Mahlkörperrückhaltesystem is made DE 4 447 321 A1 known.

Der Erfindung liegt nun die Aufgabe zugrunde, eine horizontalachsige Rührwerkskugelmühle mit einem neuartigen Trennorgan zu schaffen, das die vorgenannten Nachteile nicht aufweist und mit welcher ein Gut schonend und gleichmässig mit Kleinstmahlkörpern gemahlen werden kann, die einen Durchmesser D ≤ 0,1 mm besitzen, ohne dass diese den Mahlraum verlassen.The invention is based on the object to provide a horizontal axis agitator ball mill with a novel separating member which does not have the aforementioned disadvantages and with which a good can be gently and uniformly ground with Kleinstmahlkörpern having a diameter D ≤ 0.1 mm, without that they leave the grinding room.

Diese Aufgabe wird durch eine Rührwerkskugelmühle mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by a stirred ball mill having the features of claim 1.

Vorteilhafte Ausführungsformen der Erfindung sind Gegenstand der abhängigen Ansprüche.Advantageous embodiments of the invention are the subject of the dependent claims.

Nachfolgend werden anhand der Zeichnung Ausführungsbeispiele der Erfindung beschrieben. In der Zeichnung zeigt
   die Figur 1 einen Längsschnitt durch einen Teil einer horizontalen Mahlkammer mit einem Trennorgan der erfindungsgemässen Art,
   die Figur 2a eine Querschnitt durch das in der Figur 1 dargestellte Trennorgan,
   die Figur 2b einen Schnitt entlang der Linie IIb der Figur 2a,
   die Figur 3 einen Längsschnitt durch eine zweite Ausführungsform der Erfindung,
   die Figur 4 eine Draufsicht auf eine alternative Ausführung eines Trennorgans der erfindungsgemässen Art.Hereinafter, embodiments of the invention will be described with reference to the drawings. In the drawing shows
the FIG. 1 a longitudinal section through a part of a horizontal grinding chamber with a separating member of the inventive type,
the FIG. 2a a cross section through the in the FIG. 1 represented separating element,
the FIG. 2b a section along the line IIb the FIG. 2a .
the FIG. 3 a longitudinal section through a second embodiment of the invention,
the FIG. 4 a plan view of an alternative embodiment of a separating member of the inventive type.

Die in der Figur 1 nur zum Teil dargestellte und als ganzes mit 50 bezeichnete Mahlkammer einer Rührwerkskugelmühle weist ein Gehäuse 40 mit einer horizontalen Achse 60 auf. Das Gehäuse 40 besitzt dabei eine längliche, im Wesentlichen zylindrische Längswand 30 sowie zwei an beiden Enden der Längswand 30 angeordnete Abschlusswände 35 und 36, von denen die Abschlusswand 36 einen zum Zuführen des Mahlgutes dienenden Gut-Einlass 37 und die Abschlusswand 35 einen zum Abführen des Gutes dienenden Gut-Auslass 38 aufweist.The in the FIG. 1 only partly shown and designated as a whole with 50 grinding chamber of a stirred ball mill has a housing 40 with a horizontal axis 60. Der Gehäusehelter 40 ist mit einem Gehäuse 40 verbunden. The housing 40 has an elongated, substantially cylindrical longitudinal wall 30 and two arranged at both ends of the longitudinal wall 30 end walls 35 and 36, of which the end wall 36 serving for supplying the material to be ground good inlet 37 and the end wall 35 a for discharging the Has good serving good outlet 38.

Im Innenraum 3 ist ein Rührwerk 1 angeordnet, das mehrere, beispielsweise zwei, entlang der Achse 60 verteilte, Schaufelrad-artige Rührorgane 2 aufweist. Die zur Achse 60 koaxiale Welle 4 des Rührwerks 1 ist dabei mit ihrem die Abschlusswand 36 durchstossenden Ende an einer in der Zeichnung nicht dargestellten Antriebsvorrichtung angeschlossen.In the interior 3, an agitator 1 is arranged, which has a plurality, for example two, along the axis 60 distributed, paddle wheel-like stirring elements 2. The axis 60 coaxial shaft 4 of the agitator 1 is connected with its end wall 36 piercing end to a drive device, not shown in the drawing.

In der Abschlusswand 35 der Mahlkammer 50 befindet sich ein koaxial zur Achse 60 angeordnetes Trennorgan 80, das mit einem externen Antrieb 18 verbunden ist. Dieser externe Antrieb 18 versetzt das Trennorgan 80 in eine vom Rührwerk 1 unabhängige Drehbewegung. Der Mahlgut-Auslass 38 führt koaxial zur Achse 60 vom Trennorgan 80 zur Drehdurchführung 17.In the end wall 35 of the grinding chamber 50 is a coaxial with the axis 60 arranged separating member 80 which is connected to an external drive 18. This external drive 18 causes the separating member 80 in a rotational movement independent of the agitator 1. The grinding stock outlet 38 leads coaxially to the axis 60 from the separating member 80 to the rotary feedthrough 17th

In der Abschlusswand 35 ist eine Dichtung 45 vorgesehen, die gewährleistet, dass kein Mahlgut mitsamt Mahlkörpern aus dem Ringspalt zwischen Abtrennvorrichtung 80 und Abschlusswand 35 hindurch nach aussen dringt. Diese Dichtung 45 entspricht den Anforderungen an die Mahlkörpergrösse ≤ 0.1mm.In the end wall 35, a seal 45 is provided, which ensures that no regrind with grinding media from the annular gap between separating device 80 and end wall 35 penetrates through to the outside. This seal 45 complies with the requirements of the grinding media size ≤ 0.1mm.

Wie aus den Figuren 1, 2a und 2b ersichtlich ist, besitzt das Trennorgan 80 eine auf der Welle 9 sitzende und auf dieser lösbar befestigte Kreisscheibe 5 und eine der Abschlusswand 35 zugewandte Kreisscheibe 7 mit einem koaxial zur Achse 60 angeordneten, rohrartigen Gut-Auslauf 38, der in die Abschlusswand 35 hineinragt und in der Drehdurchführung 17 endet.Like from the Figures 1, 2a and 2b it can be seen, the separating member 80 has a seated on the shaft 9 and releasably secured to this circular disc 5 and the end wall 35 facing circular disc 7 with a coaxial with the axis 60 arranged, tubular Gut-outlet 38, which projects into the end wall 35 and in the rotary feedthrough 17 ends.

Die beiden parallel zueinander angeordneten Scheiben 5 und 7 des Trennorgans 80 stehen in vorbestimmtem Abstand voneinander. Dieser wird durch mehrere, um den Scheibenmittelpunkt symmetrisch verteilte, vom Scheibenrand nach innen führende, in der Draufsicht bogenförmige Förder- bzw. Flügelelemente 12 bestimmt. Im bevorzugten Ausführungsbeispiel gemäss den Figuren 2a, 2b sitzt die Kreisscheibe 7 auf den Flügelelementen 12 und ist über diese mit der Scheibe 5 lösbar oder unlösbar verbunden.The two mutually parallel discs 5 and 7 of the separating member 80 are at a predetermined distance from each other. This is determined by a plurality of, around the disk center point symmetrically distributed, from the disk edge inwardly leading, in plan view arcuate conveying or wing elements 12. In the preferred embodiment according to the FIGS. 2a, 2b the circular disc 7 sits on the wing elements 12 and is connected via this with the disc 5 releasably or permanently.

In einen kreisförmigen Hohlraum 8 zwischen den Scheiben 5 und 7 kann ferner ein Ringkäfig 10 mit einem an seiner Aussenfläche befindlichen Siebblechring 6 eingelegt sein. Der Ringkäfig 10 wird dabei vorzugsweise mit O-Ringen 11 verpresst und abgedichtet und kann wahlweise mit oder ohne Siebblechring 6 montiert sein. Die Wahl des Einsatzes des Siebblechringes 6 kann auf die jeweiligen Produkteigenschaften angepasst werden.In a circular cavity 8 between the discs 5 and 7, a ring cage 10 may be further inserted with a screen plate ring 6 located on its outer surface. The ring cage 10 is preferably pressed and sealed with O-rings 11 and can be mounted either with or without screen plate ring 6. The choice of the use of the screen plate ring 6 can be adapted to the respective product properties.

Beim Betrieb einer die Mahlkammer 50 aufweisenden Rührwerkskugelmühle wird durch den Einlass 37 und in Pfeilrichtung 71 ein zu mahlendes oder in einer Flüssigkeit zu dispergierendes Gut in flüssiger Form kontinuierlich in den Innenraum 3 der Mahlkammer 50 geführt und in diesem zum Mahlgut-Auslass 38 hinbefördert. Hierbei kann es sich beispielsweise vornehmlich um Produkte aus der Nanotechnologie, aber auch um Farbstoffsuspension, Lackfarben, Druckfarben, Agrochemikalien, Füllstoffsuspension, Video-Tape Beschichtungsmasse, Kosmetika, Nahrungsmittel, Pharma oder Mikroorganismen handeln. Die im Innenraum 3 der Mahlkammer 50 vorhandenen Mahlkörper vermahlen und/oder dispergieren während des Betriebes der Rührwerkskugelmühle das kontinuierlich durch die Mahlkammer 50 hindurchgeleitete Gut, worauf das in der Mahlkammer erzeugte Produkt diese - in einem kontinuierlichen Flüssigkeitsstrom - durch das Trennorgan 80 in Pfeilrichtung 72 verlässt. Der Einsatz von Kleinst-Mahlkörper D ≤ 0,1 mm dient hauptsächlich dazu, die Agglomerate und Aggregate aufzubrechen ohne dass dadurch die Primärteilchen zerstört werden.During operation of a stirred ball mill having the grinding chamber 50, a product to be ground or liquid to be dispersed in liquid form is continuously introduced into the interior 3 of the grinding chamber 50 through the inlet 37 and in the direction of arrow 71 and into the grinding stock outlet 38 transported. These may, for example, primarily be products from nanotechnology, but also dye suspension, enamel paints, printing inks, agrochemicals, filler suspension, video tape coating composition, cosmetics, foodstuffs, pharmaceuticals or microorganisms. The grinding media present in the interior 3 of the grinding chamber 50 grind and / or disperse during the operation of the stirred ball mill the product continuously passed through the grinding chamber 50, whereupon the product produced in the grinding chamber leaves the latter - in a continuous liquid flow - through the separating member 80 in the direction of arrow 72 , The use of small grinding media D ≤ 0.1 mm is mainly used to break up the agglomerates and aggregates without destroying the primary particles.

Das durch den Antrieb 18 angetriebene in Pfeilrichtung 81 (Fig. 2a) rotierende Trennorgan 80 ist nun derart ausgebildet und bemessen, dass das aus den Mahlkörpern und dem gemahlenen und/oder dispergierten Gut gebildete Gemisch in den Zwischenraum zwischen den beiden Scheiben 5 und 7 einströmt, worauf aufgrund der Zentrifugalkraft und der unterschiedlichen spezifischen Dichte die zum Mahlen dienenden Mahlkörper durch die Förderelemente 12 vom Mahlgut getrennt und zurück in den Innenraum 3 der Mahlkammer 50 befördert werden. Das Mahlgut selbst gelangt durch den kreisförmigen Hohlraum 8 des Trennorgans 80 hindurch zum Gutauslauf 38, wo es die Mahlkammer 50 verlässt. Durch die Rotation des Trennorgans 80 muss das Produkt beim Durchströmen dieses Trennorgans entgegen der Fliehkraft einen relativen Druck überwinden. Dieser Druck, der je nach Betriebszustand zwischen 0.5 und 3bar liegt, wird durch die nicht dargestellte Speisepumpe aufgebracht. Dieser Belastung entsprechend muss das Gehäuse des Trennorgans 80 und ebenso die Dichtung 45 auf der Antriebswelle 9 druckfest ausgeführt sein, für letztere ist dabei in den meisten Fällen die Verwendung einer doppelten Gleitringdichtung erforderlich.The driven by the drive 18 in the direction of arrow 81 ( Fig. 2a ) rotating separator 80 is now designed and dimensioned so that the mixture formed from the grinding media and the ground and / or dispersed Good flows into the space between the two discs 5 and 7, whereupon due to the centrifugal force and the different specific gravity for grinding serving grinding media separated by the conveying elements 12 from the material to be ground and transported back into the interior 3 of the grinding chamber 50. The millbase itself passes through the circular cavity 8 of the separating member 80 to the Gutauslauf 38, where it leaves the grinding chamber 50. Due to the rotation of the separating member 80, the product must overcome a relative pressure against the centrifugal force when flowing through this separating member. This pressure, which is between 0.5 and 3bar depending on the operating state, is applied by the feed pump (not shown). According to this load, the housing of the separating member 80 and also the seal 45 on the drive shaft 9 must be pressure-resistant, for the latter is In most cases, the use of a double mechanical seal is required.

Um Mahlkörper zu trennen sind die bestimmenden Betriebsgrössen die Umfangsgeschwindigkeit des Trennorgans 80 und die radiale Strömungsgeschwindigkeit in den Strömungskanälen. Die Umfangsgeschwindigkeit wird durch die Drehzahl bestimmt. Die radiale Strömungsgeschwindigkeit ergibt sich aus dem freien Querschnitt und dem Volumenstrom des Produktes durch die Pumpe.In order to separate grinding media, the determining operating variables are the peripheral speed of the separating member 80 and the radial flow velocity in the flow channels. The peripheral speed is determined by the speed. The radial flow velocity results from the free cross section and the volume flow of the product through the pump.

Die in der Figur 3 dargestellte Mahlkammer 51 entspricht im wesentlichen der Mahlkammer gemäss Figur 1. Das heisst, das hier mit 82 bezeichnete Trennorgan befindet sich gegenüber dem Rührwerk 22 auf einer separaten Antriebswelle und es führt der Mahlgut-Auslass 39 koaxial zur Achse 61 vom Trennorgan 82 zur Drehdurchführung 17. Der Antrieb 28 ist in diesem Fall parallel zur Achse 61 angeordnet und versetzt die das Trennorgan 83 tragende Welle über eine Unter/Übersetzung in eine vom Rührwerk 22 unabhängige Drehbewegung. Zusätzlich ist in dieser Variante noch ein Siebabstreifer 65 vorgesehen, der dazu dient, allenfalls auf dem Sieb 6 festsitzende Mahlkörper abzustreifen, so dass keine nachteilige Druckerhöhung stattfindet und alle Mahlkörper durch die Drehbewegung des Trennorgans 82 der Mahlkammer zurückgeführt werden können.The in the FIG. 3 shown grinding chamber 51 corresponds substantially to the grinding chamber according to FIG. 1 , That is, the separating element designated here by 82 is located opposite the agitator 22 on a separate drive shaft and the grinding stock outlet 39 leads coaxially to the axis 61 from the separating member 82 to the rotary feedthrough 17. The drive 28 is arranged parallel to the axis 61 in this case and puts the separating shaft 83 bearing shaft via a sub / translation in an independent of the agitator 22 rotational movement. In addition, a Siebabstreifer 65 is also provided in this variant, which serves to strip off at best on the sieve 6 fixed grinding media, so that no adverse pressure increase takes place and all grinding media can be returned by the rotational movement of the separating member 82 of the grinding chamber.

Das in der Figur 4 in Ansicht dargestellte Schaufelrad-artige Trennorgan 85 unterscheidet sich von den vorstehend beschriebenen Trennorganen 80 und 82 dadurch, dass zwischen den bogenförmigen Flügelelementen 12 noch zusätzlich gerade oder leicht gekrümmte Förderelemente 86 vorgesehen sind, die sich vom Scheibenrand nach innen erstrecken. Dadurch bildet sich im Innern eine sekundäre Strömung.That in the FIG. 4 A vane-wheel-like separating element 85, which is shown in the view, differs from the separating elements 80 and 82 described above in that, between the arcuate vane elements 12, additionally straight or slightly curved conveying elements 86 are provided, which extend inwards from the edge of the disc. As a result, a secondary flow forms inside.

An dieser Stelle sei noch darauf hingewiesen, dass bei einer zur Drehrichtung der Rührwerkswelle entgegengesetzten Rotation des Trennorgans, die Förderelemente gegenüber den in den Figuren 2 und 4 gezeichneten Elementen 12 bzw. 86 selbstverständlich spiegelverkehrt ausgebildet bzw. angeordnet sind.At this point it should be noted that in a direction opposite to the direction of rotation of the agitator shaft rotation of the separating element, the conveying elements with respect to those in the Figures 2 and 4 drawn elements 12 and 86, of course, mirror-inverted trained or arranged.

Das erfindungsgemässe Abtrennsystem einer Rührwerkskugelmühle für Kleinst-Mahlkörper mit einem Durchmesser D ≤ 0,1 mm weist gegenüber den bekannten Abtrennsystemen folgende Vorteile auf:

  • Die Rückhaltung der Kleinst-Mahlkörper im Mahlraum ist durch die geregelte und von der Rührwellen-Drehzahl unabhängige Einstellung der Drehzahl es Trennorgans gewährleistet.
  • Die Herstellungsproblematik der Bauteile ist entschärft worden.
  • Die Verstopfungsproblematik am Spaltsieb und Siebblech ist durch die Verwendung von einfachen dünnen Geweben entschärft oder beim Weglassen der Siebe eliminiert worden.
  • Die Belastung der Abtrennteile ist unbedeutend.
  • Verschleiss am Reibspalt ist nicht existent.
  • Die Herstellungsprobleme einer sehr engen und genauen Reibspaltkonstruktion sind eliminiert.
The separation system according to the invention of an agitator ball mill for very small grinding media with a diameter D ≦ 0.1 mm has the following advantages over the known separation systems:
  • The retention of the smallest grinding media in the grinding chamber is ensured by the regulated and independent of the stirring shaft speed setting the speed of the separating member.
  • The manufacturing problem of the components has been defused.
  • The clogging problem on the slotted screen and screen plate has been defused by the use of simple thin fabrics or eliminated in the omission of the screens.
  • The burden of the separation parts is insignificant.
  • Wear on the friction gap is nonexistent.
  • The manufacturing problems of a very tight and accurate friction gap design are eliminated.

Es sei an dieser Stelle darauf hingewiesen, dass die anhand der Figuren 1 bis 3 beschriebenen Mahlkammern, Rühr- und Trennorgane nur eine Auswahl von mehreren möglichen Ausführungsformen der Erfindung darstellen und in verschiedener Hinsicht geändert werden können.It should be noted at this point that the basis of the FIGS. 1 to 3 described grinding chambers, stirring and separating members represent only a selection of several possible embodiments of the invention and can be varied in various respects.

So können beispielsweise die Trennorgane 80 und 82 wahlweise mit oder ohne geraden Förderelementen 86 versehen werden, die Förderelemente 12 und 86 entweder sowohl an den Scheiben 5 oder 7 befestigt sein und es können die Trennorgane wahlweise mit oder ohne Siebblechring 6 ausgestattet sein. Auch sind die Baugrössen der Trennorgane von den zu wählenden Umfangsgeschwindigkeiten abhängig und können von Fall zu Fall stark variieren.Thus, for example, the separating members 80 and 82 are optionally provided with or without straight conveying elements 86, the conveying elements 12 and 86 either to the Slices 5 or 7 be attached and it can be equipped with or without screen plate ring 6, the separating elements. The sizes of the separating elements are dependent on the peripheral speeds to be selected and can vary greatly from case to case.

Ferner können die vorstehend beschriebenen Rührorganen zahlenmässig beliebig miteinander und/oder auch mit anderen bekannten Rührorganen kombiniert werden und es kann die Mahlkammer noch zusätzlich mit Druckentlastungsventilen oder dergleichen ausgebildet sein, um allfällige Druckschwankungen, insbesondere Druckerhöhungen auszugleichen. Schliesslich kann die Längswand der Mahlkammer noch zusätzlich von einem zylindrischen Mantel umhüllt sein, der mit ihr zusammen einen im Querschnitt kreisförmigen, Zwischenraum begrenzt, in den zum Kühlen oder Erwärmen des im Innenraum vorhandenen Gutes ein Kühl- oder Heizfluid eingeleitet werden kann.Furthermore, the stirring elements described above can numerically arbitrarily combined with each other and / or with other known stirrers and it may be additionally formed with pressure relief valves or the like, the grinding chamber to compensate for any pressure fluctuations, in particular pressure increases. Finally, the longitudinal wall of the grinding chamber may be additionally enveloped by a cylindrical shell, which together with it defines a circular cross-section, a gap in the cooling or heating of the material present in the interior of a cooling or heating fluid can be introduced.

Claims (7)

  1. Continuously operating horizontal agitator ball mill which serves for the fine grinding and pulverizing of a material, having a cylindrical or conical grinding chamber (50, 51) which serves for accommodating grinding bodies, having a material inlet (37) which is arranged at the end of the grinding chamber (50, 51) and opens out into the interior (3) of the grinding chamber (50, 51), having a material outlet which is arranged at the other end of the grinding chamber and leads out of the interior (3) and having an agitator which comprises a plurality of agitating elements (2) and is coaxial with the chamber axis (60), and also having a separately driven separating system which is arranged upstream of the material outlet and comprises a separating means which has two circular discs (5, 7) which are arranged coaxially with the chamber axis (61) and between which are arranged a plurality of delivery or vane elements which are distributed symmetrically about the disc centre point, characterized in that the separating means (80, 82) is seated on a hollow shaft (9) which is independent of the agitator (1, 22) and in the cavity of which the material outlet (38, 39) is arranged, and in that the delivery or vane elements (12, 86) extend from the periphery of the disc into the vicinity of the material outlet and, during operation of the separating arrangement subject the material/grinding-body mixture to a counterpressure, in which case, on account of the centrifugal force and of the different specific densities, the grinding bodies are separated from the product and delivered back into the interior (3).
  2. Agitator ball mill according to Claim 1, characterized in that the delivery or vane elements are arcuate.
  3. Agitator ball mill according to Claim 2, characterized in that, in addition to the arcuate delivery or vane elements (12), rectilinear, or more or less rectilinear, delivery or vane elements (86) are also provided, and these extend inwards from the periphery of the disc.
  4. Agitator ball mill according to Claim 1, characterized in that the two circular discs (5, 7) are connected to one another in a releasable or non-releasable manner.
  5. Agitator ball mill according to Claim 1 or 2, characterized in that provided between the two circular discs (5, 7) is an annular cage (10) which rotates along therewith and encloses a circular cavity (8).
  6. Agitator ball mill according to Claim 3, characterized in that a screen-plate ring (6) is accommodated in the annular cage (10).
  7. Agitator ball mill according to Claim 6, characterized in that provided on the terminating wall (35) is a screen stripper (65) by means of which any grinding bodies and grinding material which may be adhering to the screen is stripped off and kept in motion.
EP04405182A 2003-04-15 2004-03-24 Agitator ball mill Revoked EP1468739B1 (en)

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ATE389456T1 (en) 2008-04-15
EP1468739A1 (en) 2004-10-20
JP2004314066A (en) 2004-11-11
DE502004006541D1 (en) 2008-04-30
DK1468739T3 (en) 2008-07-21
PL1468739T3 (en) 2008-10-31
ES2304157T3 (en) 2008-09-16
JP4205620B2 (en) 2009-01-07
US20050224612A1 (en) 2005-10-13
US7014134B2 (en) 2006-03-21

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