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EP2189221B1 - Stirring ball mill - Google Patents

Stirring ball mill Download PDF

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Publication number
EP2189221B1
EP2189221B1 EP09006371.0A EP09006371A EP2189221B1 EP 2189221 B1 EP2189221 B1 EP 2189221B1 EP 09006371 A EP09006371 A EP 09006371A EP 2189221 B1 EP2189221 B1 EP 2189221B1
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EP
European Patent Office
Prior art keywords
grinding
ball mill
gap
size reduction
reduction device
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EP09006371.0A
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German (de)
French (fr)
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EP2189221A2 (en
EP2189221A3 (en
Inventor
Theron Harbs
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Netzsch Feinmahltechnik GmbH
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Netzsch Feinmahltechnik GmbH
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Priority to PL09006371T priority Critical patent/PL2189221T3/en
Publication of EP2189221A2 publication Critical patent/EP2189221A2/en
Publication of EP2189221A3 publication Critical patent/EP2189221A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B02C17/161—Arrangements for separating milling media and ground material

Definitions

  • Agitator ball mill with a mixing vessel surrounding a stirring shaft, which is provided with a product inlet and a product outlet, wherein the Mahltospian located within the grinding container are activated by the rotation of the stirring shaft and retained by a separating or classifying device in the grinding chamber.
  • This agitator ball mill goes out of the FIG. 1 of the DE 44 12 408 A1 out.
  • This agitator ball mill has a double-walled grinding container, which is suitable for cooling.
  • the coaxial with the grinding container arranged agitator shaft is connected to a gear and a drive.
  • the grinding container has a Mahlguteinlcorro in its lid and centrally in its bottom a Mahlgutauslenfin.
  • Mahltosenia located in the grinding chamber located on the stirrer shaft, provided with holes grinding discs, the Mahltos emotions in motion, whereby the energy that acts from the engine to the grinding discs, transfers to the Mahltos emotions.
  • a separating device may also be provided.
  • a vertically arranged agitator ball mill known from the DD 217 434 B1 is a vertically arranged agitator ball mill known.
  • This agitator ball mill works with a stirring shaft to which a screw-shaped grinding element is attached.
  • a pre-shredding device connected to the stirrer shaft, which consists of a crushing cone and a crushing ring fastened to the grinding container wall.
  • the material to be ground or the material to be fed passes directly to the top side of the conveyor via a screw conveyor Brechkegels and from there into the crushing gap. After pre-shredding the material falls into the grinding container, where it is processed by the stirring shaft and the Mahl morn located in the grinding container.
  • the filling level in the grinding container is monitored by a level measuring device. This is not possible with horizontally arranged mills and mills whose grinding space is fully utilized. In these cases, the material to be ground with the Mahlöskörpem in the field of Vorzerkleir michs heard.
  • the patent application WO 2006/11638 A2 discloses a vertical agitating ball mill which is provided in the inlet area, the material feed, with a pre-shredding device.
  • the pre-shredding is realized via two actively connected rings, wherein one of the rings is at least partially adjustable.
  • EP 0 276 811 A2 and EP 0 276 812 A2 disclose vertical agitator ball mills. These agitator ball mills are provided in the region of the outlet for the ground material with separating devices for separating Mahlangeskörpem and regrind. For separating elements are arranged on annular rotors, with which the Mahltos redesign be transported back by the centrifugal force in the grinding container. There are always several individual elements arranged on a rotatable rotor.
  • the aim of the invention is to combine a grinding and dispersing with a pre-crushing, which is largely protected against the wear that can cause the Mahlgut- / MahlosSystemgemisch.
  • Mahl ⁇ sharmas Due to the pressure prevailing in the grinding container and the percentage high Mahlos stresses circulllung in the grinding container, during the operation of the ball mill, Mahlos stresses reach the grinding gap of Vorzerklein ceremoniess observed and here to wear or other
  • Impairments Because of this, it is provided according to the invention to protect the grinding gap by a dynamic gap protection.
  • the gap protection is arranged as a rotating part after the pre-shredder.
  • the effect of the gap protection is improved according to the invention in that in this case a ring element is used, which is connected to the rotor of the pre-shredder.
  • the ring element hurls the Mahltosisson radially in the region of the grinding gap and simultaneously generates a negative pressure zone at the end of the gap transition to the grinding chamber whereby the product easily passes from the grinding zone into the grinding chamber.
  • the ring element on the grinding chamber-side end of the grinding gap on a neck which is designed wedge-shaped.
  • This design has the advantage that between the approach and the ring element, a distance can be maintained, which corresponds to 2 to 10 times the width of the grinding gap. This distance can be adapted in case of complicated construction of the attachment of the ring element, the size of the pre-shredded material or Mahlöskörpem.
  • the dynamic ring element overlaps the grinding gap in a ratio of 2 to 10 times the width of the grinding gap.
  • the rotating part of the pre-shredding device is connected to the stirrer shaft.
  • the stationary part of the pre-shredding device communicates with the grinding container. This is particularly advantageous when this area of the grinding container is cooled. Even the cooling of one of the parts of the pre-shredding device keeps the product temperature constant during the pre-shredding.
  • the toothed disks are arranged so that their surfaces directed towards the grinding chamber of the rotating and stationary parts of the pre-shredding device simultaneously form the inlet-side grinding chamber boundary.
  • the gap formed by the stationary and the rotating part of the pre-shredding device is advantageously kept smaller than the diameter of the grinding auxiliary body located in the grinding chamber. In this case, a gap width of 0.2 - 2 mm is selected.
  • either the rotating or the stationary part of the pre-shredding device can be axially adjustable, whereby the gap width can be changed during, before or after the production process.
  • both the rotating and the stationary part of the pre-shredding device are axially adjustable via threads on the agitator shaft or on the grinding container. Lock nuts fix the corrected working position.
  • the rotating and / or the stationary part of the pre-shredding device can be corrected by electrical or hydraulic actuators in their position.
  • the initiatable via external command elements piston or electric drives thus allow a direct intervention on the pre-crushing and thus also an intervention on the fineness of the grinding process supplied product.
  • FIG. 1 shows an agitator ball mill 10 with a grinding container 12 which is surrounded by a cooling jacket 14.
  • grinding chamber 16 In grinding chamber 16 are Mahltosterrorism 18, which are shown purely for demonstration only in a certain area of the grinding chamber.
  • the stirring shaft 20 In the grinding chamber itself is the stirring shaft 20, are placed on the grinding discs 22, with holes 24. The stirring shaft is rotated by a drive, not shown in rotation.
  • a preclassifier 26 which consists of a cage-like structure with a plurality of rods 28 and at least one closely spaced to the cage, provided with holes disc 30th can exist.
  • a separator in the form of a sieve 32 downstream of the preclassifier.
  • the product leaves the grinding chamber through the product outlet 34, which is arranged centrally in the grinding container bottom 36.
  • the grinding vessel bottom itself is connected by screws 38 to a grinding vessel flange 40.
  • the product inlet 42 Through the product inlet 42, the product passes into the inlet chamber 44, to which the seal 46 abuts, which in turn sits on the drive shaft 48.
  • the pre-shredding device 50 From the inlet chamber, the product passes to the pre-shredding device 50, which is composed of a stationary part 52 and a rotating part 54.
  • the standing part 52 overlaps both the coolant channel 56 and the Mahl alternerdeckel 58.
  • the standing and thus the rotating part of the pre-crushing device may be moved towards the grinding chamber, so that the standing ring can be tempered more intensively by the coolant flowing in the coolant channel.
  • the grinding chamber facing surface 60 of the stationary part and the surface 62 of the rotating part form the inlet side grinding chamber boundary.
  • the annular grinding gap has a width of 0.2 - 2 mm.
  • FIG. 2 shows the arrangement of a dynamic gap protection 68, which is designed as a ring element 80.
  • the gap protection 68 that is to say the ring element 80, is connected via screws 38 both to the rotating toothed disk 70 and to the rotating part 54 of a hub.
  • the hub has central bores 72, by means of which the attachment to the agitator shaft 20 takes place.
  • FIG. 3 shows a not covered by the invention arrangement of a gap protection 68, which is adjacent only to the grinding gap.
  • Its ring member 80 is made of wear-resistant material such as ceramic, high-alloy steel or the like.
  • the ring member 80 does not overlap the gap in this embodiment. In this case, the proximity of the rotating part 70 to the grinding gap and possibly the generated radial flow is sufficient to keep the grinding gap 64 at its mouth to the grinding chamber 16 free of auxiliary grinding bodies.
  • the ratio of the width a of the refining gap 64 to the radial overlap c through the shoulder is 1: 3.
  • the axial distance b of the projection 74 to the end of the grinding gap 64 is compared to the width a of the grinding gap 64 in a ratio of 1: 4. This distance ratio allows a resistance-free entry of the pre-shredded product in the grinding chamber 16, since the approach 74 or its, the grinding gap 64 opposite surface does not inhibit the inflow.
  • the projection 74 of the gap protection 68 is in this embodiment as a wedge-shaped or nose-shaped approach.
  • the bevel reduces the wear on the circumference of the ring member 80 and minimizes turbulence.
  • FIGS. 6 and 7 show a variant embodiment in which the gap protection 68 does not work dynamically but statically. For this lies the ring element

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

Description

Rührwerkskugelmühle mit einem eine Rührwelle umgebenden Mahlbehälter, der mit einem Produkteinlaß und einem Produktauslaß versehen ist, wobei die innerhalb des Mahlbehälters befindlichen Mahlhilfskörper durch die Rotation der Rührwelle aktiviert und von einer Trenn- oder Klassiereinrichtung im Mahlraum zurückgehalten werden.Agitator ball mill with a mixing vessel surrounding a stirring shaft, which is provided with a product inlet and a product outlet, wherein the Mahlhilfskörper located within the grinding container are activated by the rotation of the stirring shaft and retained by a separating or classifying device in the grinding chamber.

Eine Rührwerkskugelmühle dieser Art geht aus der Figur 1 der DE 44 12 408 A1 hervor. Diese Rührwerkskugelmühle verfügt über einen doppelwandigen Mahlbehälter, der zur Kühlung geeignet ist. Innerhalb des Mahlbehälters ist die koaxial zum Mahlbehälter angeordnete Rührwelle mit einem Getriebe und einem Antrieb verbunden. Der Mahlbehälter hat in seinem Deckel einen Mahlguteinlaß und zentrisch in seinem Boden einen Mahlgutauslaß. Das Produkt tritt über den Einlaß in den Mahlraum und wird hier durch die im Mahlraum befindlichen Mahlhilfskörper bearbeitet. Dazu setzen die auf der Rührwelle befindlichen, mit Löchern versehenen Mahlscheiben die Mahlhilfskörper in Bewegung, wodurch sich die Energie, die vom Motor auf die Mahlscheiben wirkt, auf die Mahlhilfskörper überträgt. Die dabei zur Verfügung stehende kinetische Energie führt zur Dispergierung bzw. Vermahlung des in den Mahlbehälter eingeführten Produkts. Je nachdem wie man die Rührwerkskugelmühle betreibt, ob im Ein- oder Mehrpassagenverfahren, gelangt das Produkt anschließend entweder in seiner gewünschten Endfeinheit oder als Zwischenprodukt in den Bereich einer Vorklassierstufe, die die Mahlhilfskörper und ggf. auch Produkte in entsprechender Größe im Mahlraum zurückhält. Zusätzlich zum Vorklassierer kann auch eine Trenneinrichtung vorgesehen sein.An agitator ball mill of this kind goes out of the FIG. 1 of the DE 44 12 408 A1 out. This agitator ball mill has a double-walled grinding container, which is suitable for cooling. Within the grinding container, the coaxial with the grinding container arranged agitator shaft is connected to a gear and a drive. The grinding container has a Mahlguteinlaß in its lid and centrally in its bottom a Mahlgutauslaß. The product passes through the inlet into the grinding chamber and is processed here by the Mahlhilfskörper located in the grinding chamber. For this purpose, located on the stirrer shaft, provided with holes grinding discs, the Mahlhilfskörper in motion, whereby the energy that acts from the engine to the grinding discs, transfers to the Mahlhilfskörper. The available kinetic energy leads to the dispersion or grinding of the introduced into the grinding container product. Depending on how one operates the agitator ball mill, whether in single or multi-pass process, the product then passes either in its desired final fineness or as an intermediate in the range of Vorklassierstufe which retains the Mahlhilfskörper and possibly also products of appropriate size in the grinding chamber. In addition to the pre-classifier, a separating device may also be provided.

Aus der DD 217 434 B1 ist eine vertikal angeordnete Rührwerkskugelmühle bekannt. Diese Rührwerkskugelmühle arbeitet mit einer Rührwelle an der ein schneckenförmiges Mahlelement befestigt ist. Im Einlaßbereich der Mühle befindet sich eine mit der Rührwelle verbundene Vorzerkleinerungseinrichtung, die aus einem Brechkegel und einem an der Mahlbehälterwand befestigten Brechring besteht. Das Mahlgut bzw. Aufgabegut gelangt über einen Schneckenförderer direkt auf die Oberseite des Brechkegels und von da aus in den Brechspalt. Nach erfolgter Vorzerkleinerung fällt das Material in den Mahlbehälter, in dem es von der Rührwelle und den im Mahlbehälter befindlichen Mahlkörpern bearbeitet wird. Die Füllstandshöhe im Mahlbehälter wird über ein Füllstandsmeßgerät überwacht. Dies ist bei horizontal angeordneten Mühlen und bei Mühlen, deren Mahlraum vollständig ausgenutzt wird, nicht möglich. In diesen Fällen gelangt das Mahlgut mit den Mahlhilfskörpem in den Bereich der Vorzerkleirierungseinrichtung.From the DD 217 434 B1 is a vertically arranged agitator ball mill known. This agitator ball mill works with a stirring shaft to which a screw-shaped grinding element is attached. In the inlet region of the mill, there is a pre-shredding device connected to the stirrer shaft, which consists of a crushing cone and a crushing ring fastened to the grinding container wall. The material to be ground or the material to be fed passes directly to the top side of the conveyor via a screw conveyor Brechkegels and from there into the crushing gap. After pre-shredding the material falls into the grinding container, where it is processed by the stirring shaft and the Mahlkörpern located in the grinding container. The filling level in the grinding container is monitored by a level measuring device. This is not possible with horizontally arranged mills and mills whose grinding space is fully utilized. In these cases, the material to be ground with the Mahlhilfskörpem in the field of Vorzerkleirierungseinrichtung.

Die Patentanmeldung WO 2006/11638 A2 offenbart eine senkrecht stehende Rührwerkskugelmühle die im Einlassbereich, der Materialaufgabe, mit einer Vorzerkleinerungsvorrichtung versehen ist. Die Vorzerkleinerung wird über zwei in Wirkverbindung stehende Ringe realisiert, wobei einer der Ringe zumindest teilweise verstellbar ist.The patent application WO 2006/11638 A2 discloses a vertical agitating ball mill which is provided in the inlet area, the material feed, with a pre-shredding device. The pre-shredding is realized via two actively connected rings, wherein one of the rings is at least partially adjustable.

Die europäischen Patentanmeldungen EP 0 276 811 A2 und EP 0 276 812 A2 offenbaren senkrecht stehende Rührwerkskugelmühlen. Diese Rührwerkskugelmühlen sind im Bereich des Auslasses für das Mahlgut mit Trenneinrichtungen zum Separieren von Mahlhilfskörpem und Mahlgut versehen. Zum Separieren sind an ringförmigen Rotoren Elemente angeordnet, mit welchen die Mahlhilfskörper durch die Zentrifugalkraft in der Mahlbehälter zurück transportiert werden. Es sind immer mehrerer Einzelelemente auf einem drehbaren Rotor angeordnet.The European patent applications EP 0 276 811 A2 and EP 0 276 812 A2 disclose vertical agitator ball mills. These agitator ball mills are provided in the region of the outlet for the ground material with separating devices for separating Mahlhilfskörpem and regrind. For separating elements are arranged on annular rotors, with which the Mahlhilfskörper be transported back by the centrifugal force in the grinding container. There are always several individual elements arranged on a rotatable rotor.

Ziel der Erfindung ist es eine Mahl- und Dispergiervorrichtung mit einer Vorzerkleinerung zu kombinieren, die weitestgehend gegen den Verschleiß geschützt ist, den das Mahlgut-/Mahlhilfskörpergemisch verursachen kann.The aim of the invention is to combine a grinding and dispersing with a pre-crushing, which is largely protected against the wear that can cause the Mahlgut- / Mahlhilfskörpergemisch.

Das Ziel wird mit einer Rührwerkskugelmühle mit den im Anspruch 1 angegebenen Merkmalen erreicht.The object is achieved with a stirred ball mill having the features specified in claim 1.

Aufgrund des im Mahlbehälter herrschenden Drucks und der prozentualen hohen Mahlhilfskörperfüllung im Mahlbehälter können, während des Betriebs der Rührwerkskugelmühle, Mahlhilfskörper an den Mahlspalt der Vorzerkleinerungseinrichtung gelangen und hier zu Verschleiß oder anderenDue to the pressure prevailing in the grinding container and the percentage high Mahlhilfskörperfüllung in the grinding container, during the operation of the ball mill, Mahlhilfskörper reach the grinding gap of Vorzerkleinerungseinrichtung and here to wear or other

Beeinträchtigungen führen. Aufgrund dessen ist es gemäss der Erfindung vorgesehen den Mahlspalt durch einen dynamischen Spaltschutz zu schützen.Impairments. Because of this, it is provided according to the invention to protect the grinding gap by a dynamic gap protection.

Hierbei ist der Spaltschutz als rotierendes Teil nach dem Vorzerkleinerer angeordnet.Here, the gap protection is arranged as a rotating part after the pre-shredder.

Die Wirkung des Spaltschutzes wird entsprechend der Erfindung dadurch verbessert, dass hierbei ein Ringelement zur Anwendung kommt, das mit dem Rotor des Vorzerkleinerers verbunden ist. Hierbei schleudert das Ringelement die Mahlhilfskörper im Bereich des Mahlspaltes radial ab und erzeugt gleichzeitig eine Unterdruckzone am Ende des Spaltübergangs zum Mahlraum wodurch das Produkt aus der Vermahlzone leicht in den Mahlraum übertritt.The effect of the gap protection is improved according to the invention in that in this case a ring element is used, which is connected to the rotor of the pre-shredder. In this case, the ring element hurls the Mahlhilfskörper radially in the region of the grinding gap and simultaneously generates a negative pressure zone at the end of the gap transition to the grinding chamber whereby the product easily passes from the grinding zone into the grinding chamber.

In einer erfindungsgemäßen Ausgestaltung der Erfindung weist das Ringelement am mahlraumseitigen Ende des Mahlspalts einen Ansatz auf, der keilförmig gestaltet ist.In an inventive embodiment of the invention, the ring element on the grinding chamber-side end of the grinding gap on a neck, which is designed wedge-shaped.

Diese Gestaltung bringt den Vorteil mit sich, dass zwischen dem Ansatz und dem Ringelement ein Abstand eingehalten werden kann, der dem 2- bis 10-fachen der Weite des Mahlspalts entspricht. Dieser Abstand kann bei aufwendiger Konstruktion der Befestigung des Ringelements, der Größe des vorzerkleinerten Gutes oder den Mahlhilfskörpem angepaßt werden.This design has the advantage that between the approach and the ring element, a distance can be maintained, which corresponds to 2 to 10 times the width of the grinding gap. This distance can be adapted in case of complicated construction of the attachment of the ring element, the size of the pre-shredded material or Mahlhilfskörpem.

Entsprechend einer weiteren Ausgestaltung der Erfindung kann es für die Funktion der Vorzerkleinerungsvorrichtung wesentlich sein, dass das dynamische Ringelement den Mahlspalt in einem Verhältnis vom 2- bis 10-fachen der Weite des Mahlspalts überlappt.According to a further embodiment of the invention, it may be essential for the function of the pre-shredding device that the dynamic ring element overlaps the grinding gap in a ratio of 2 to 10 times the width of the grinding gap.

Entsprechend einer bevorzugten Ausführung ist das rotierende Teil der Vorzerkleinerungseinrichtung mit der Rührwelle verbunden.According to a preferred embodiment, the rotating part of the pre-shredding device is connected to the stirrer shaft.

Das stehende Teil der Vorzerkleinerungseinrichtung steht mit dem Mahlbehälter in Verbindung. Dies ist insbesondere dann von Vorteil, wenn dieser Bereich des Mahlbehälters gekühlt wird. Schon die Kühlung eines der Teile der Vorzerkleinerungseinrichtung bewirkt das Konstanthalten der Produkttemperatur während der Vorzerkleinerung.The stationary part of the pre-shredding device communicates with the grinding container. This is particularly advantageous when this area of the grinding container is cooled. Even the cooling of one of the parts of the pre-shredding device keeps the product temperature constant during the pre-shredding.

Bei einer vorteilhaften Weiterbildung der Erfindung sind die Zahnscheiben so angeordnet, dass deren zum Mahlraum gerichtete Flächen des rotierenden und des stehenden Teils der Vorzerkleinerungseinrichtung gleichzeitig die einlassseitige Mahlraumbegrenzung bilden.In an advantageous development of the invention, the toothed disks are arranged so that their surfaces directed towards the grinding chamber of the rotating and stationary parts of the pre-shredding device simultaneously form the inlet-side grinding chamber boundary.

Der vom stehenden und vom rotierenden Teil der Vorzerkleinerungseinrichtung gebildete Spalt wird vorteilhafterweise kleiner gehalten als der Durchmesser der im Mahlraum befindlichen Mahlhilfskörper. Dabei wird eine Spaltweite von 0,2 - 2 mm gewählt. Durch die Anordnung von zusätzlichen Flügeln oder dergleichen auf der zum Mahlraum weisenden Seite des rotierenden Teils kann die Einströmung der vorzerkleinerten Produktteile verbessert und ein Mahlhilfskörperstau im Bereich des Scherspaltes vermieden bzw. reduziert werden.The gap formed by the stationary and the rotating part of the pre-shredding device is advantageously kept smaller than the diameter of the grinding auxiliary body located in the grinding chamber. In this case, a gap width of 0.2 - 2 mm is selected. The arrangement of additional wings or the like on the grinding chamber facing side of the rotating part, the inflow of pre-shredded product parts can be improved and a Mahlhilfskörperstau avoided or reduced in the shear gap.

In einer besonderen erfindungsgemäßen Ausgestaltung kann entweder das rotierende oder auch das stehende Teil der Vorzerkleinerungseinrichtung axial verstellbar sein, wodurch die Spaltweite während, vor oder nach dem Produktionsprozeß verändert werden kann. In einer rein mechanischen Ausgestaltungsmöglichkeit der Erfindung sind sowohl das rotierende wie auch das stehende Teil der Vorzerkleinerungseinrichtung über Gewinde auf der Rührwelle oder am Mahlbehälter axial einstellbar. Über Kontermuttern wird die korrigierte Arbeitsstellung fixiert.In a particular embodiment of the invention, either the rotating or the stationary part of the pre-shredding device can be axially adjustable, whereby the gap width can be changed during, before or after the production process. In a purely mechanical embodiment of the invention, both the rotating and the stationary part of the pre-shredding device are axially adjustable via threads on the agitator shaft or on the grinding container. Lock nuts fix the corrected working position.

In einer Weiterbildung der vorgenannten erfinderischen Gestaltung sind das rotierende und/oder das stehende Teil der Vorzerkleinerungseinrichtung durch elektrische oder hydraulische Stellglieder in ihrer Position korrigierbar. Die über externe Befehlselemente initiierbaren Kolben oder Elektroantriebe erlauben somit einen direkten Eingriff auf die Vorzerkleinerung und damit auch einen Eingriff auf die Feinheit des dem Mahlprozeß zugeführten Produkts.In a development of the aforementioned inventive design, the rotating and / or the stationary part of the pre-shredding device can be corrected by electrical or hydraulic actuators in their position. The initiatable via external command elements piston or electric drives thus allow a direct intervention on the pre-crushing and thus also an intervention on the fineness of the grinding process supplied product.

Ausführungsbeispiele der Vorzerkleinerungseinrichtung und der Rührwerkskugelmühle gehen aus den nachfolgend beschriebenen Darstellungen hervor. Es zeigen:

Figur 1
eine Rührwerkskugelmühle mit Vorzerkleinerung gemäss der Erfindung;
Figur 2
Schnittdarstellung des rotierenden und stehenden Teil des Vorzerkleinerers aus Figur 1;
Figur 3
Teilansicht des rotierenden Teil, die nicht Teil der Erfindung ist;
Figur 4
Ausschnitt mit Zerkleinerungsspalt der Ausführung aus Figur 1;
Figur 5
Ausschnitt mit Zerkleinerungsspalt der Ausführung aus Figur 1.
Exemplary embodiments of the pre-shredding device and the agitator ball mill will become apparent from the illustrations described below. Show it:
FIG. 1
a stirred ball mill with pre-crushing according to the invention;
FIG. 2
Sectional view of the rotating and stationary part of the pre-shredder FIG. 1 ;
FIG. 3
Partial view of the rotating part, which is not part of the invention;
FIG. 4
Cutout with crushing gap of execution FIG. 1 ;
FIG. 5
Cutout with crushing gap of execution FIG. 1 ,

Die Figur 1 zeigt eine Rührwerkskugelmühle 10 mit einem Mahlbehälter 12, der von einem Kühlmantel 14 umgeben ist. Im Mahlraum 16 befinden sich Mahlhilfskörper 18, die rein zur Demonstration nur in einem bestimmten Bereich des Mahlraums dargestellt sind. Im Mahlraum selbst befindet sich die Rührwelle 20, auf der Mahlscheiben 22, mit Löchern 24 plaziert sind. Die Rührwelle wird von einem nicht dargestellten Antrieb in Rotation versetzt. Zur Trennung der Mahlhilfskörper 18 vom Produkt, das in den Mahlraum eingeführt wird, sitzt am freien Ende der Rührwelle 20 ein Vorklassierer 26, der aus einem käfigartigen Gebilde mit mehreren Stäben 28 und mindestens einer im engen Abstand zum Käfig angeordneten, mit Löchern versehenen Scheibe 30 bestehen kann. Im Ausführungsbeispiel der Figur 1 ist dem Vorklassierer zusätzlich eine Trenneinrichtung in Form eines Siebs 32 strömungstechnisch nachgeschaltet.The FIG. 1 shows an agitator ball mill 10 with a grinding container 12 which is surrounded by a cooling jacket 14. In grinding chamber 16 are Mahlhilfskörper 18, which are shown purely for demonstration only in a certain area of the grinding chamber. In the grinding chamber itself is the stirring shaft 20, are placed on the grinding discs 22, with holes 24. The stirring shaft is rotated by a drive, not shown in rotation. To separate the Mahlhilfskörper 18 from the product, which is introduced into the grinding chamber, sitting at the free end of the stirring shaft 20, a preclassifier 26, which consists of a cage-like structure with a plurality of rods 28 and at least one closely spaced to the cage, provided with holes disc 30th can exist. In the embodiment of FIG. 1 In addition, a separator in the form of a sieve 32 downstream of the preclassifier.

Das Produkt verläßt den Mahlraum durch den Produktauslass 34, der im Mahlbehälterboden 36 zentrisch angeordnet ist. Der Mahlbehälterboden selbst ist durch Schrauben 38 mit einem Mahlbehälterflansch 40 verbunden. Durch den Produkteinlass 42 gelangt das Produkt in die Einlasskammer 44, an die die Dichtung 46 angrenzt, die wiederum auf der Antriebswelle 48 sitzt. Aus der Einlasskammer gelangt das Produkt zur Vorzerkleinerungseinrichtung 50, die sich aus einem stehenden Teil 52 und einem rotierenden Teil 54 zusammensetzt. Das stehende Teil 52 überlappt sowohl den Kühlmittelkanal 56 wie auch den Mahlbehälterdeckel 58. In einer modifizierten Ausbildung der Erfindung kann das stehende und damit auch das rotierende Teil der Vorzerkleinerungseinrichtung in Richtung zum Mahlraum verschoben sein, damit der stehende Ring intensiver durch das im Kühlmittelkanal strömende Kühlmittel temperiert werden kann. Die zum Mahlraum gerichtete Fläche 60 des stehenden Teils und die Fläche 62 des rotierenden Teils bilden die einlassseitige Mahlraumbegrenzung. Der ringförmige Mahlspalt hat eine Weite von 0,2 - 2 mm.The product leaves the grinding chamber through the product outlet 34, which is arranged centrally in the grinding container bottom 36. The grinding vessel bottom itself is connected by screws 38 to a grinding vessel flange 40. Through the product inlet 42, the product passes into the inlet chamber 44, to which the seal 46 abuts, which in turn sits on the drive shaft 48. From the inlet chamber, the product passes to the pre-shredding device 50, which is composed of a stationary part 52 and a rotating part 54. The standing part 52 overlaps both the coolant channel 56 and the Mahlbehälterdeckel 58. In a modified embodiment of the invention, the standing and thus the rotating part of the pre-crushing device may be moved towards the grinding chamber, so that the standing ring can be tempered more intensively by the coolant flowing in the coolant channel. The grinding chamber facing surface 60 of the stationary part and the surface 62 of the rotating part form the inlet side grinding chamber boundary. The annular grinding gap has a width of 0.2 - 2 mm.

Aus Figur 2 wird die Anordnung eines dynamischen Spaltschutzes 68 ersichtlich, der als Ringelement 80 ausgebildet ist. Der Spaltschutz 68, sprich das Ringelement 80 steht über Schrauben 38 sowohl mit der rotierenden Zahnscheibe 70 wie auch mit dem rotierenden Teil 54 einer Nabe in Verbindung. Die Nabe weist zentrische Bohrungen 72 auf, mittels derer die Befestigung an der Rührwelle 20 geschieht.Out FIG. 2 shows the arrangement of a dynamic gap protection 68, which is designed as a ring element 80. The gap protection 68, that is to say the ring element 80, is connected via screws 38 both to the rotating toothed disk 70 and to the rotating part 54 of a hub. The hub has central bores 72, by means of which the attachment to the agitator shaft 20 takes place.

Figur 3 zeigt eine von der Erfindung nicht umfasste Anordnung eines Spaltschutzes 68, der nur am Mahlspalt angrenzt. Dessen Ringelement 80 besteht aus verschleißfestem Material, wie Keramik, hochlegiertem Stahl oder dergleichen. Das Ringelement 80 überlappt in dieser Ausführung den Spalt nicht. Hierbei reicht die Nähe vom rotierenden Teil 70 zum Mahlspalt und ggf. die erzeugte radiale Strömung, um den Mahlspalt 64 an seiner Mündung zum Mahlraum 16 frei von Mahlhilfskörpern zu halten. FIG. 3 shows a not covered by the invention arrangement of a gap protection 68, which is adjacent only to the grinding gap. Its ring member 80 is made of wear-resistant material such as ceramic, high-alloy steel or the like. The ring member 80 does not overlap the gap in this embodiment. In this case, the proximity of the rotating part 70 to the grinding gap and possibly the generated radial flow is sufficient to keep the grinding gap 64 at its mouth to the grinding chamber 16 free of auxiliary grinding bodies.

Gemäß der Figur 4 und Figur 5 werden Ausführungsbeispiele erläutert, aus denen die bevorzugten Abstände des Ansatzes 74 sowohl radial wie auch axial zum Mahlspalt 64 und dessen Weite a hervorgehen. Demnach ist das Verhältnis von der Weite a des Mahlspalts 64 zur radialen Überlappung c durch den Ansatz 1:3. Der axiale Abstand b des Ansatzes 74 zum Ende des Mahlspalts 64 steht im Vergleich zur Weite a des Mahlspalts 64 in einem Verhältnis von 1:4. Dieses Abstandsverhältnis erlaubt einen widerstandslosen Eintritt des vorzerkleinerten Produkts in den Mahlraum 16, da der Ansatz 74 bzw. dessen, dem Mahlspalt 64 gegenüberliegende Fläche das Einströmen nicht hemmt.According to the FIG. 4 and FIG. 5 Embodiments are explained, from which the preferred distances of the projection 74 both radially and axially to the grinding gap 64 and its width a emerge. Thus, the ratio of the width a of the refining gap 64 to the radial overlap c through the shoulder is 1: 3. The axial distance b of the projection 74 to the end of the grinding gap 64 is compared to the width a of the grinding gap 64 in a ratio of 1: 4. This distance ratio allows a resistance-free entry of the pre-shredded product in the grinding chamber 16, since the approach 74 or its, the grinding gap 64 opposite surface does not inhibit the inflow.

Der Ansatz 74 des Spaltschutzes 68 stellt sich in diesem Ausführungsbeispiel als keil- oder nasenförmiger Ansatz dar. Die Abschrägung vermindert den Verschleiß am Umfang des Ringelements 80 und minimiert Turbulenzen.The projection 74 of the gap protection 68 is in this embodiment as a wedge-shaped or nose-shaped approach. The bevel reduces the wear on the circumference of the ring member 80 and minimizes turbulence.

Aus den beiden Figuren 6 und 7 geht eine Ausführungsvariante hervor, bei der der Spaltschutz 68 nicht dynamisch, sondern statisch arbeitet. Hierzu liegt das RingelementFIGS. 6 and 7 show a variant embodiment in which the gap protection 68 does not work dynamically but statically. For this lies the ring element

Claims (13)

  1. An agitator ball mill with a grinding container (12) surrounding an agitator shaft (20)
    - with a product inlet (42) and a product outlet (34)
    - an agitator shaft (20) disposed inside the grinding container (12) parallel to the longitudinal axis
    - a separation device retains the auxiliary grinding bodies in the grinding chamber (16),
    - a preliminary size reduction device (50) which is disposed downstream of the grinding stock inlet (42) and upstream of the grinding chamber (16), wherein the preliminary size reduction device (50) comprises a rotary part (54) and a stationary part (52) and forms a grinding gap (64) open towards the grinding chamber (16),
    characterised in that
    the end of the grinding gap (64) on the grinding chamber side is overlapped by a dynamic gap protection (60), wherein the gap protection (68) is constituted as an annular element, which is connected to the rotating part (54) of the preliminary size reduction device (50).
  2. The agitator ball mill according to claim 1,
    characterised in that
    the rotatably disposed annular element (78, 80) in the region of the grinding gap (64) comprises a wedge-shaped projection (74), the thickness whereof is reduced with respect to the thickness of the annular element (78, 80).
  3. The agitator ball mill according to claim 2,
    characterised in that
    the wedge-shaped projection (74) overlaps the grinding gap by 2 to 10 times the width of the grinding gap (64).
  4. The agitator ball mill according to claim 3,
    characterised in that
    the wedge-shaped projection (74) is disposed at an axial distance from the end of the grinding gap (64) of 2 to 10 times the width of the grinding gap (64).
  5. The agitator ball mill according to claim 1,
    characterised in that
    the rotary part (54) of the preliminary size reduction device (50) is connected to the agitator shaft (20).
  6. The agitator ball mill according to claim 1,
    characterised in that
    the stationary part (52) of the preliminary size reduction device (50) is connected to the grinding container (12).
  7. The agitator ball mill according to any one of the preceding claims,
    characterised in that
    the rotary part (54) of the preliminary size reduction device (50) comprises a toothed disc (70).
  8. The agitator ball mill according to claim 7,
    characterised in that
    the toothed disc (70) is formed conically and the teeth (72) disposed on the cone surface.
  9. The agitator ball mill according to claim 1,
    characterised in that
    the rotary and/or the stationary part (54, 52) of the preliminary size reduction device (50) are provided with conical working surfaces.
  10. The agitator ball mill according to claim 9,
    characterised in that
    the grinding gap (64) of the preliminary size reduction device (50) diminishes in the direction of the grinding chamber (16).
  11. The agitator ball mill according to any one of the preceding claims,
    characterised in that
    the grinding gap (64) pointing towards the grinding chamber and constituted by the stationary part (52) and the rotary part (54) of the preliminary size reduction device (50) has a width of 0.2 - 2 mm.
  12. The agitator ball mill according to any one of the preceding claims,
    characterised in that
    the stationary part (52) of the preliminary size reduction device (50) is disposed at least partially in the region of a cooling area for the grinding container (12).
  13. The agitator ball mill according to any one of the preceding claims,
    characterised in that
    both the rotary part as well as the stationary part (54, 52) of the preliminary size reduction device (50) are axially adjustable, as result of which the gap width of the grinding gap can be varied during, before or after the production process, wherein the rotary part (54) moves in the axial direction by means of a thread (78) on the agitator shaft (20) and the stationary and/or rotary part (52, 54) of the preliminary size reduction device (50) can be moved by electrical or hydraulic actuators.
EP09006371.0A 2008-11-22 2009-05-12 Stirring ball mill Active EP2189221B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09006371T PL2189221T3 (en) 2008-11-22 2009-05-12 Stirring ball mill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008058585A DE102008058585A1 (en) 2008-11-22 2008-11-22 stirred ball mill

Publications (3)

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EP2189221A2 EP2189221A2 (en) 2010-05-26
EP2189221A3 EP2189221A3 (en) 2013-04-24
EP2189221B1 true EP2189221B1 (en) 2014-07-16

Family

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US (1) US8028943B2 (en)
EP (1) EP2189221B1 (en)
BR (1) BRPI0902612B1 (en)
DE (1) DE102008058585A1 (en)
DK (1) DK2189221T3 (en)
ES (1) ES2517940T3 (en)
PL (1) PL2189221T3 (en)

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Also Published As

Publication number Publication date
EP2189221A2 (en) 2010-05-26
US20100127108A1 (en) 2010-05-27
ES2517940T3 (en) 2014-11-04
BRPI0902612A2 (en) 2010-09-14
PL2189221T3 (en) 2015-01-30
EP2189221A3 (en) 2013-04-24
US8028943B2 (en) 2011-10-04
DK2189221T3 (en) 2014-10-06
BRPI0902612B1 (en) 2020-04-07
DE102008058585A1 (en) 2010-05-27

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