EP2036613B1 - Stirring ball mill - Google Patents

Stirring ball mill Download PDF

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Publication number
EP2036613B1
EP2036613B1 EP08014106A EP08014106A EP2036613B1 EP 2036613 B1 EP2036613 B1 EP 2036613B1 EP 08014106 A EP08014106 A EP 08014106A EP 08014106 A EP08014106 A EP 08014106A EP 2036613 B1 EP2036613 B1 EP 2036613B1
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EP
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Prior art keywords
ball mill
stirring ball
mill according
spiral
agitator shaft
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EP08014106A
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German (de)
French (fr)
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EP2036613A3 (en
EP2036613A2 (en
Inventor
Horst Pausch
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Netzsch Feinmahltechnik GmbH
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Netzsch Feinmahltechnik GmbH
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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
    • 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
    • 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

Definitions

  • the invention relates to a stirred ball mill with a cylindrical grinding container having at least one Mahlguteinlraw and at least one Mahlgutauslenfin, wherein in the Mahlgut actuallyer a connected to a drive agitator shaft is arranged, which transfers a portion of the drive energy to Mahltos stresses that are loosely arranged in the grinding container and a before the Mahlgutauslledge arranged separation device.
  • This separating device has a plurality of arcuate conveying or wing elements, which are arranged between two discs on.
  • the wing members extend from the outer edge of the discs toward the center thereof, the members terminating in part at different distances from the Mahlgutauslenfin.
  • the object of the invention is therefore to improve a separator even for KleinstmahlMech to the effect that even during the start-up and shut-down phase of the agitator ball mill penetration of Mahlos phenomena is prevented in the Mahlgutauslenfin.
  • the invention thus provides a stirred ball mill, comprising a cylindrical grinding container having at least one grinding stock inlet and a grinding stock outlet, wherein the grinding container horizontally arranged as shown in the embodiment has a stirring shaft connected to a drive, which transmits a part of the drive energy to the grinding auxiliary body.
  • a separator is used which has at least one spiral.
  • the separation alignment consists of two spirals.
  • a further preferred embodiment provides that the spirals are arranged at a constant distance from each other.
  • Another preferred embodiment of the invention is provided to achieve a self-locking of Mahltos emotions each other when the separator is stopped.
  • the spiral extends with its radially inner end directly to Mahlgutauslescu.
  • the Mahlgutauslenfin may extend on both sides of the longitudinal center of the spiral.
  • the width of the spiral (s) is at least one third of its diameter.
  • the spiral sits between the agitator shaft surface and the longitudinal axis of the agitator shaft.
  • the stirring shaft which has radial openings in this area.
  • the slot-shaped openings are inclined counter to the direction of rotation of the stirring shaft.
  • the openings of the agitator shaft may be advantageous to make the openings of the agitator shaft tangential or asymmetrical to its longitudinal axis.
  • the stirring shaft in the spiral / n with stirring elements consisting of Rhakstäben or cams and which are offset by at least 45 ° to each other.
  • the spiral / n contrary to the normal design, in which they consist of sheet metal, consist of individual spaced-apart rods and webs. These rods and webs can, but need not be touching, connected to each other.
  • the diameter of the spiral (s) is at least 30% of the grinding chamber diameter.
  • the diameter of the spiral (s) is at least 30% of the diameter of the cavity in the agitator shaft.
  • the separating device is used with a drive arranged independently of the stirring shaft, it may be advantageous if the spirals are inserted between two full-surface sealing surfaces.
  • the side faces located on the spirals end surfaces have openings through which Mahlos stresses can flow back into the grinding chamber.
  • the radially outer ends of the spirals are offset by at least 90 ° to each other.
  • the agitator ball mill consists of a housing 10 in which a drive 12 is seated in the form of an electric motor.
  • the drive is connected by means of a drive belt 14 with a drive shaft 16 in connection.
  • This drive shaft passes into the bearing shaft 18, which in turn is connected to the agitator shaft 20.
  • the grinding chamber 48 is bounded by the grinding container 26 which surrounds the stirring shaft 20 and the grinding container bottom 28.
  • the separating device 30, with which the Mahltosharm 54 are separated from the ground material, sitting within the Stirring shaft 20. For cooling or heating of the grinding container this is double-walled with a coolable or heatable jacket 32 surrounded.
  • FIG. 2 shows the arrangement of a spiral 36, within the agitator shaft 20, in the surface of stirring rods 38 are used.
  • the millbase flows here centrally from the grinding container 26 via a line 40, which merges into a pipeline 42.
  • the FIG. 3 discloses the design of a spiral used, for example, for separating the auxiliary grinding bodies from the material to be ground.
  • This spiral 36 extends here over 720 °.
  • the grinding material flowing into the spiral passes through the pipeline 40 to the grinding stock outlet.
  • the grinding auxiliary bodies are conveyed back into the grinding chamber 48 via passages 46 in the agitating shaft before they enter the worm gear 44.
  • FIGS. 4 and 5 Examples of the arrangement of the spiral can be seen, in which the spirals 36 each extend through 360 °.
  • the spiral consists of rods, in FIG. 6 from triangular-shaped profiles. Through this in the In the widest sense, rough surfaces of the spirals are said to support the self-locking effect that occurs during stoppage of the stirrer shaft. To increase this self-locking effect, the design of the spiral in FIGS. 4 and 6 be increased by extending the spiral.
  • FIG. 5 illustrates the design of the passages 46, the lateral surfaces 50 are directed tangentially to the central axis of the agitator shaft.
  • FIG. 7 is a separator 30 can be seen, which has one or more spirals 36. Depending on how long the path of the individual Mahlos stresses in the spiral, the fewer turns must make the separate drive 52 to accomplish a penetration of Mahlos stresses in the Mahlgutauslescu.
  • FIGS. 9 and 10 let recognize that the separator operates with a right- and left-handed spiral. It does not matter in the end that the spiral rotates in the opposite direction of rotation as the agitator shaft. The function of the spiral is independent of the direction of rotation of the stirrer shaft.
  • FIG. 11 agitator ball mill rotates the separator 30 synchronously with the agitator shaft 20.
  • the spiral 36 of the separator abuts with its left side on the agitator shaft and is clamped to the right side by a clamping element 56 with the agitator shaft.
  • Centrally in the longitudinal center of the spiral is located in the region of the longitudinal axis of the agitator shaft 20 of the inlet 58 of the Mahlgutauslasses 34th Die
  • FIG. 12 illustrates in this case, the length of the spiral 36, which here covers a range of 630 °.
  • the design of the separator according to the FIGS. 13, 14 and 15 is especially designed for high-viscosity substances. Since in high-viscosity materials, the forces of resistance between the product and the Mahlos stressesn are very high, you need a longer way to separate the Mahlos redesign, why in FIG. 13 two spirals 36 are provided.
  • the outer surfaces of the spirals act as deflectors until the beginning of the other screw. This means that these surfaces 60 produce a pulsating effect in the direction of the grinding chamber and thus already cause a deflection of the auxiliary grinding bodies in the direction of the grinding chamber at the periphery of the separating device.
  • the auxiliary grinding bodies are constantly forced to return to the grinding chamber by the frictional forces on the spiral walls and the reverse conveying direction.
  • FIG. 14 will be the use of in the FIG. 13 described spirals 36 shown.
  • the separator is located here directly on the front side of the overhung agitator shaft 20.
  • the product flows centrally via the agitator shaft 20 and bearing shaft 18 from.
  • the grinding container bottom 28 has a projection 60.
  • the spiral 36 is open in the direction of projection so that Mahlospian can flow back into the grinding chamber 48 on a short path.
  • the outer region of the spiral 36 is bounded by a ring 62.
  • FIGS. 16 and 17 show separation devices with two spirals, each extending over a range of 500 ° and 560 °.
  • the two spirals have screw threads with always constant wall distance A.
  • the separating device 30 rotates together with the agitator shaft 20, the product outlet being effected by the agitator shaft 20 and the bearing shaft 18.
  • the separator is a projection 60 designed, which is used for flow formation.
  • the agitator shaft has in this embodiment, no grinding pins 31, but cam 62.
  • FIGS. 18, 19, 20 and 21 demonstrate the location and design of separators with spirals whose spacing is as in FIG. 18 constant, in FIG. 19 reducing and in FIG. 20 are executed widening.
  • the FIG. 18 corresponds to the here FIG. 16 in which the distance A remains constant over the entire arrangement of the two spirals 36.
  • the spirals 36 are arranged so that the distance B is reduced from the grinding chamber to the outlet.
  • This variant is used in particular when low-viscosity material is used and thus it must be expected that the agitator ball mill will be put out of operation for a short time. Due to the reducing distance between the two spirals, the self-inhibiting effect between the spiral walls and the auxiliary grinding bodies is enhanced. Due to the arrangement of the two spirals according to FIG. 20 you can achieve a faster flow of the product after separation from the Mahlos stressesn.
  • the illustrated geometry of the two spirals 36 shows that the distance C increases in the direction from the grinding chamber to the Mahlgutauslenfin.
  • FIG. 23 Another possibility for conveying auxiliary grinding bodies from the area of the separating device laterally out of the spiral passages back into the grinding chamber is in FIG. 23 shown.
  • the separating device 30 is seated within a cavity 64 which is open on one side within the agitator shaft.
  • the spiral 36 is held by the agitator shaft 20.
  • the ring has a slot 68 through which the Mahlos emotions can flow via the cavity 64 back into the grinding chamber.
  • the processed ground material leaves the grinding chamber from the central region within the spiral / s 36 via a dip tube 70. As out FIG. 22 shows, this separator has only one spiral 36.

Abstract

The stirring ball mill has a cylindrical meal container (26) that has a meal material inlet (24) and a meal material outlet (34). An agitator shaft (20) is arranged with in the meal container, and is connected with a drive (12). The agitator shaft balances a part of the driving energy on a milling body. A separator (30) is provided, which is formed in a spiral shape.

Description

Die Erfindung betrifft eine Rührwerkskugelmühle mit einem zylindrischen Mahlbehälter der mindestens einen Mahlguteinlaß und mindestens einen Mahlgutauslaß aufweist, wobei im Mahlgutbehälter eine mit einem Antrieb verbundene Rührwelle angeordnet ist, die einen Teil der Antriebsenergie auf Mahlhilfskörper überträgt, die im Mahlbehälter lose angeordnet sind und einer vor dem Mahlgutauslaß angeordneten Trenneinrichtung.The invention relates to a stirred ball mill with a cylindrical grinding container having at least one Mahlguteinlaß and at least one Mahlgutauslaß, wherein in the Mahlgutbehälter a connected to a drive agitator shaft is arranged, which transfers a portion of the drive energy to Mahlhilfskörper that are loosely arranged in the grinding container and a before the Mahlgutauslaß arranged separation device.

Eine Rührwerkskugelmühle dieser Gattung geht aus der EP 1 468 739 A1 hervor. Bei dieser horizontal angeordneten Rührwerksmühle steht der Mahlbehälter mit einem Mahlguteinlaß und einem Mahlgutauslaß in Verbindung. Im Mahlbehälter selbst befindet sich eine Rührwelle, die mit einem Antrieb in Verbindung steht. Die im Mahlraum eingefüllten Mahlhilfskörper werden durch Rührorgane beschleunigt, so daß das zwischen den Mahlhilfskörpern befindliche Mahlgut zerkleinert oder dispergiert wird. Die Feinheit des in dieser Rührwerkskugelmühle produzierten Produkts ist größtenteils abhängig von der Größe der eingesetzten Mahlhilfskörper. Zur Trennung der Mahlhilfskörper vom Mahlgut ist am Ende des Mahlbehälters eine mit dem Mahlgutauslaß verbundene Trenneinrichtung vorgesehen. Diese Trenneinrichtung weist mehrere bogenförmige Förder- bzw. Flügelelemente, die zwischen zwei Scheiben angeordnet sind, auf. Die Flügelelemente erstrecken sich vom äußeren Rand der Scheiben in Richtung dessen Zentrum, wobei die Elemente teilweise in unterschiedlichen Abständen vom Mahlgutauslaß enden.An agitator ball mill of this kind goes out of the EP 1 468 739 A1 out. In this horizontally arranged Rührwerksmühle the grinding container is connected to a Mahlguteinlaß and a Mahlgutauslaß in combination. In the grinding container itself is a stirring shaft, which is in communication with a drive. The Mahlhilfskörper filled in the grinding chamber are accelerated by stirring, so that the grinding material located between the Mahlhilfskörpern is comminuted or dispersed. The fineness of the product produced in this stirred ball mill is largely dependent on the size of the auxiliary grinding bodies used. To separate the Mahlhilfskörper from the material to be ground at the end of the grinding container connected to the Mahlgutauslaß separation device is provided. This separating device has a plurality of arcuate conveying or wing elements, which are arranged between two discs on. The wing members extend from the outer edge of the discs toward the center thereof, the members terminating in part at different distances from the Mahlgutauslaß.

Aufgrund der geringen Strecke, die die Mahlhilfskörper zwischen den Flügelelementen zurücklegen müssen, läßt sich ein Eindringen von Mahlhilfskörpern während des Stillstands der Trennvorrichtung in den Mahlauslaß nicht verhindern.Due to the small distance that the Mahlhilfskörper must cover between the wing elements, penetration of Mahlhilfskörpern can not be prevented during the standstill of the separator in the Mahlauslaß.

Die Aufgabe der Erfindung besteht deshalb darin, eine Trennvorrichtung auch für Kleinstmahlkörper dahingehend zu verbessern, daß auch während der An- und Auslauflaufphase der Rührwerkskugelmühle ein Eindringen der Mahlhilfskörper in den Mahlgutauslaß verhindert wird.The object of the invention is therefore to improve a separator even for Kleinstmahlkörper to the effect that even during the start-up and shut-down phase of the agitator ball mill penetration of Mahlhilfskörper is prevented in the Mahlgutauslaß.

Gelöst wird diese Aufgabe mit den Merkmalen des Anspruchs 1. Weitere erfindungsgemäße Ausführungsformen werden in den Merkmalen der Unteransprüche angeführt.This object is achieved with the features of claim 1. Further embodiments of the invention are set forth in the features of the subclaims.

Durch die Erfindung wird somit eine Rührwerkskugelmühle geschaffen, mit einem zylindrischen Mahlbehälter, der mindestens einen Mahlguteinlaß und einen Mahlgutauslaß aufweist, wobei der wie im Ausführungsbeispiel dargestellt horizontal angeordnete Mahlbehälter eine mit einem Antrieb verbundene Rührwelle hat, die einen Teil der Antriebsenergie auf die Mahlhilfskörper überträgt. Zur Trennung der Mahlhilfskörper vom Mahlgut wird eine Trenneinrichtung eingesetzt, die mindestens eine Spirale aufweist.The invention thus provides a stirred ball mill, comprising a cylindrical grinding container having at least one grinding stock inlet and a grinding stock outlet, wherein the grinding container horizontally arranged as shown in the embodiment has a stirring shaft connected to a drive, which transmits a part of the drive energy to the grinding auxiliary body. To separate the Mahlhilfskörper from the ground material, a separator is used which has at least one spiral.

Bei einer bevorzugten Ausgestaltung, die bei Kleinstmahlkörpern zum Einsatz kommt, besteht die Trennausrichtung aus zwei Spiralen.In a preferred embodiment, which is used in Kleinstmahlkörpern, the separation alignment consists of two spirals.

Eine weitere vorzugsweise Ausgestaltung sieht vor, daß die Spiralen mit konstanten Abstand zueinander angeordnet sind.A further preferred embodiment provides that the spirals are arranged at a constant distance from each other.

Bei Kleinstmahlkörpern kann es vorteilhaft sein, die Spiralen mit unterschiedlichen Abstand zueinander anzuordnen.In the case of very small grinding bodies, it may be advantageous to arrange the spirals at different distances from one another.

Eine andere vorzugsweise Ausgestaltung der Erfindung ist vorgesehen, um beim Stillstand der Trenneinrichtung eine Selbsthemmung der Mahlhilfskörper untereinander zu erreichen. Hierbei erstreckt sich die Spirale mit ihrem radial inneren Ende direkt bis zum Mahlgutauslaß.Another preferred embodiment of the invention is provided to achieve a self-locking of Mahlhilfskörper each other when the separator is stopped. Here, the spiral extends with its radially inner end directly to Mahlgutauslaß.

Um den Durchsatz in der Rührwerkskugelmühle zu erhöhen, kann sich der Mahlgutauslaß beidseits der Längsmitte der Spirale erstrecken.In order to increase the throughput in the agitator ball mill, the Mahlgutauslaß may extend on both sides of the longitudinal center of the spiral.

Es hat sich gezeigt, daß eine sichere Trennung der Mahlhilfskörper vom Mahlgut von statten geht, wenn die Spirale/n sich um einen Kreisumfang von mindestens 360° um die Längsachse der Rührwelle erstrecken.It has been found that a reliable separation of the Mahlhilfskörper from the material to be ground is done when the spiral / n extend around a circumference of at least 360 ° about the longitudinal axis of the agitator shaft.

In Abhängigkeit vom Durchsatz mit dem die Mühle gefahren wird, kann es vorteilhaft sein, wenn die Breite der Spirale/n mindestens ein Drittel ihres Durchmessers beträgt.Depending on the throughput with which the mill is driven, it may be advantageous if the width of the spiral (s) is at least one third of its diameter.

Nachdem die Spirale/n auch bei wenig Umdrehungen eine sichere Abtrennung der Mahlhilfskörper vom Mahlgut garantieren, kann es vorteilhaft sein, die Spirale/n über einen unabhängigen Antrieb in Rotation zu versetzen.After the spiral / s guarantee a reliable separation of the Mahlhilfskörper from the material to be ground even with little turns, it may be advantageous to enable the spiral / n via an independent drive in rotation.

Entsprechend einer vorteilhaften Anordnung in der die Spirale/n gegen übermäßigen Verschließ am äußeren Ende geschützt wird, sitzt die Spirale zwischen der Rührwellenoberfläche und der Längsachse der Rührwelle. Innerhalb eines käfigartigen Abschnitts der Rührwelle, die in diesem Bereich radiale Öffnungen aufweist.According to an advantageous arrangement in which the spiral is protected against excessive closure at the outer end, the spiral sits between the agitator shaft surface and the longitudinal axis of the agitator shaft. Within a cage-like portion of the stirring shaft, which has radial openings in this area.

Um das Abströmen der Mahlhilfskörper in diesem käfigartigen Bereich zu fördern, sind die schlitzförmigen Öffnungen entgegen der Drehrichtung der Rührwelle geneigt.In order to promote the outflow of Mahlhilfskörper in this cage-like area, the slot-shaped openings are inclined counter to the direction of rotation of the stirring shaft.

Je nachdem welche Viskositätswerte das Produkt aufweist, kann es von Vorteil sein, die Öffnungen der Rührwelle tangential oder asymmetrisch zu deren Längsachse zu gestalten.Depending on which viscosity values the product has, it may be advantageous to make the openings of the agitator shaft tangential or asymmetrical to its longitudinal axis.

Zur Auflockerung des Mahlhilfskörper-Pakets im Bereich des Auslasses kann es von Vorteil sein, die Rührwelle im Bereich der Spirale/n mit Rührelementen zu versehen, die aus Rührstäben oder Nocken bestehen und die um mindestens 45° zueinander versetzt sind.To loosen the Mahlhilfskörper package in the region of the outlet, it may be advantageous to provide the stirring shaft in the spiral / n with stirring elements consisting of Rührstäben or cams and which are offset by at least 45 ° to each other.

Bei einer weiteren vorzugsweisen Ausgestaltung bestehen die Spirale/n entgegen der Normalausführung, in der sie aus Blech bestehen, aus einzelnen voneinander beabstandeten Stäben und Stegen. Diese Stäbe und Stege können, müssen jedoch nicht berührend miteinander verbunden sein.In a further preferred embodiment, the spiral / n contrary to the normal design, in which they consist of sheet metal, consist of individual spaced-apart rods and webs. These rods and webs can, but need not be touching, connected to each other.

Es ist weiterhin bevorzugt, daß der Durchmesser der Spirale/n wenigstens 30% des Mahlraumdurchmessers beträgt.It is further preferred that the diameter of the spiral (s) is at least 30% of the grinding chamber diameter.

In einer weiteren Gestaltungsvariante ist der Durchmesser der Spirale/n wenigstens 30% des Durchmessers des Hohlraums in der Rührwelle.In a further design variant, the diameter of the spiral (s) is at least 30% of the diameter of the cavity in the agitator shaft.

Kommt die Trenneinrichtung mit unabhängig von der Rührwelle angeordnetem Antrieb zum Einsatz, kann es von Vorteil sein, wenn die Spiralen zwischen zwei vollflächigen Abschlußflächen eingesetzt sind.If the separating device is used with a drive arranged independently of the stirring shaft, it may be advantageous if the spirals are inserted between two full-surface sealing surfaces.

Zur Verbesserung der Rückströmung der Mahlhilfskörper kann es von Vorteil sein, wenn die seitlich an den Spiralen befindlichen Abschlußflächen Öffnungen aufweisen, durch die Mahlhilfskörper in den Mahlraum zurückströmen können.To improve the backflow of the auxiliary grinding body, it may be advantageous if the side faces located on the spirals end surfaces have openings through which Mahlhilfskörper can flow back into the grinding chamber.

Zur Beeinflussung der Strömungsrichtung im Bereich des Auslasses, wird es von Vorteil sein, wenn in die Spirale/n ein seitlich angeordneter Verdränger-Körper eingesetzt wird.To influence the flow direction in the region of the outlet, it will be advantageous if a laterally arranged displacer body is inserted into the spiral (s).

Entsprechend einer erfindungsgemäßen Weiterbildung der Erfindung sind die radial äußeren Enden der Spiralen um mindestens 90° zueinander versetzt.According to an embodiment of the invention, the radially outer ends of the spirals are offset by at least 90 ° to each other.

Die Erfindung wird anhand von Ausführungsbeispielen nachfolgend unter Bezugnahme auf die Zeichnungen lediglich exemplarisch näher erläutert. Es zeigt:

Figur 1
schematische Seitenansicht einer Rührwerkskugelmühle
Figur 2
schematische Seitenansicht der Rührwerksmühle
Figur 3
Vertikalschnitt zu einer Spiral-Anordnung
Figur 4
Vertikalschnitt durch eine Schneckenführung
Figur 5
Teilansicht der Rührwelle mit Spiralabschnitt
Figur 6
Vertikalschnitt der Rührwelle
Figur 7
schematische Seitenansicht einer Rührwerkskugelmühle
Figur 8
schematische Seitenansicht einer Rührwerkskugelmühle
Figur 9
Vertikalschnitt durch eine Rührwelle
Figur 10
Vertikalschnitt durch eine Rührwelle
Figur 11
schematische Seitenansicht eines Mahlbehälters
Figur 12
Vertikalschnitt einer Rührwelle
Figur 13
Vertikalschnitt einer Trenneinrichtung
Figur 14
schematische Seitenansicht eines Mahlbehälters
Figur 15
Teilansicht einer Trenneinrichtung
Figur 16
Vertikalschnitt einer Rührwelle
Figur 17
schematische Seitenansicht eines Mahlbehälters
Figur 18
Vertikalschnitt einer Rührwelle
Figur 19
Vertikalschnitt einer Rührwelle
Figur 20
Vertikalschnitt einer Rührwelle
Figur 21
schematische Seitenansicht eines Mahlbehälters
Figur 22
Vertikalschnitt einer Rührwelle
Figur 23
schematische Seitenansicht eines Mahlbehälters
The invention will be explained in more detail by way of example only with reference to exemplary embodiments with reference to the drawings. It shows:
FIG. 1
schematic side view of a stirred ball mill
FIG. 2
schematic side view of the agitator mill
FIG. 3
Vertical section to a spiral arrangement
FIG. 4
Vertical section through a screw guide
FIG. 5
Partial view of the stirrer shaft with spiral section
FIG. 6
Vertical section of the stirrer shaft
FIG. 7
schematic side view of a stirred ball mill
FIG. 8
schematic side view of a stirred ball mill
FIG. 9
Vertical section through a stirrer shaft
FIG. 10
Vertical section through a stirrer shaft
FIG. 11
schematic side view of a grinding container
FIG. 12
Vertical section of a stirrer shaft
FIG. 13
Vertical section of a separating device
FIG. 14
schematic side view of a grinding container
FIG. 15
Partial view of a separating device
FIG. 16
Vertical section of a stirrer shaft
FIG. 17
schematic side view of a grinding container
FIG. 18
Vertical section of a stirrer shaft
FIG. 19
Vertical section of a stirrer shaft
FIG. 20
Vertical section of a stirrer shaft
FIG. 21
schematic side view of a grinding container
FIG. 22
Vertical section of a stirrer shaft
FIG. 23
schematic side view of a grinding container

Die erfindungsgemäße Rührwerkskugelmühle besteht aus einem Gehäuse 10, in dem ein Antrieb 12 in Form eines Elektromotors sitzt. Der Antrieb steht mittels eines Antriebsriemens 14 mit einer Antriebswelle 16 in Verbindung. Diese Antriebswelle geht in die Lagerwelle 18 über, die wiederum mit der Rührwelle 20 verbunden ist. An der Oberseite des Lagergehäuses 22 befindet sich der Mahlguteinlaß 24. Der Mahlraum 48 wird begrenzt durch den Mahlbehälter 26 der die Rührwelle 20 umgibt und den Mahlbehälter-Boden 28. Die Trenneinrichtung 30, mit der die Mahlhilfskörper 54 vom Mahlgut abgetrennt werden, sitzt innerhalb der Rührwelle 20. Zur Kühlung bzw. Heizung des Mahlbehälters ist dieser doppelwandig mit einem kühl- bzw. heizbaren Mantel 32 umgeben. Das Mahlgut verläßt den Mahlbehälter über einen zentrischen Mahlgutauslaß, der von der Rührwelle über die Lagerwelle bis zur Antriebswelle führt. Die Figur 2 zeigt die Anordnung einer Spirale 36, innerhalb der Rührwelle 20, in deren Oberfläche Rührstäbe 38 eingesetzt sind. Das Mahlgut strömt hier zentrisch aus dem Mahlbehälter 26 über eine Leitung 40, die in eine Rohrleitung 42 übergeht.The agitator ball mill according to the invention consists of a housing 10 in which a drive 12 is seated in the form of an electric motor. The drive is connected by means of a drive belt 14 with a drive shaft 16 in connection. This drive shaft passes into the bearing shaft 18, which in turn is connected to the agitator shaft 20. The grinding chamber 48 is bounded by the grinding container 26 which surrounds the stirring shaft 20 and the grinding container bottom 28. The separating device 30, with which the Mahlhilfskörper 54 are separated from the ground material, sitting within the Stirring shaft 20. For cooling or heating of the grinding container this is double-walled with a coolable or heatable jacket 32 surrounded. The ground material leaves the grinding container via a centric Mahlgutauslaß, which leads from the agitator shaft on the bearing shaft to the drive shaft. The FIG. 2 shows the arrangement of a spiral 36, within the agitator shaft 20, in the surface of stirring rods 38 are used. The millbase flows here centrally from the grinding container 26 via a line 40, which merges into a pipeline 42.

Die Figur 3 offenbart die Gestaltung einer beispielsweise zur Abtrennung der Mahlhilfskörper vom Mahlgut eingesetzten Spirale. Diese Spirale 36 erstreckt sich hier über 720°. Das in die Spirale einfließende Mahlgut gelangt durch die Rohrleitung 40 zum Mahlgutauslaß. Um eine Entlastung der Trenneinrichtung herbeizuführen, werden die Mahlhilfskörper bereits vor dem Eindringen in den Schneckengang 44 über Durchlässe 46 in der Rührwelle zurück in den Mahlraum 48 gefördert.The FIG. 3 discloses the design of a spiral used, for example, for separating the auxiliary grinding bodies from the material to be ground. This spiral 36 extends here over 720 °. The grinding material flowing into the spiral passes through the pipeline 40 to the grinding stock outlet. In order to bring about relief of the separating device, the grinding auxiliary bodies are conveyed back into the grinding chamber 48 via passages 46 in the agitating shaft before they enter the worm gear 44.

In den Figuren 4 und 5 sind Ausführungsbeispiele der Anordnung der Spirale zu entnehmen, bei der sich die Spiralen 36 jeweils um 360° erstrecken. In Figur 4 besteht die Spirale aus Stäben, in Figur 6 aus dreieck-förmigen Profilen. Durch diese im weitesten Sinne als rauh zu bezeichnenden, inneren Oberflächen der Spiralen wird der Selbsthemmeffekt unterstützt, der während des Stillstands der Rührwelle eintritt. Zur Erhöhung dieses selbsthemmenden Effektes kann die Gestaltung der Spirale in Figuren 4 und 6 durch ein Verlängern der Spirale gesteigert werden.In the FIGS. 4 and 5 Examples of the arrangement of the spiral can be seen, in which the spirals 36 each extend through 360 °. In FIG. 4 the spiral consists of rods, in FIG. 6 from triangular-shaped profiles. Through this in the In the widest sense, rough surfaces of the spirals are said to support the self-locking effect that occurs during stoppage of the stirrer shaft. To increase this self-locking effect, the design of the spiral in FIGS. 4 and 6 be increased by extending the spiral.

Figur 5 verdeutlicht die Gestaltung der Durchlässe 46, deren seitliche Flächen 50 tangential zur Mittelachse der Rührwelle gerichtet sind. Aus Figur 7 ist eine Trenneinrichtung 30 zu entnehmen, die eine oder mehrere Spiralen 36 aufweist. Je nachdem wie lange der Weg der einzelnen Mahlhilfskörper in der Spirale ist, desto weniger Umdrehungen muß der separate Antrieb 52 vollziehen, um eine Eindringen der Mahlhilfskörper in den Mahlgutauslaß zu bewerkstelligen. FIG. 5 illustrates the design of the passages 46, the lateral surfaces 50 are directed tangentially to the central axis of the agitator shaft. Out FIG. 7 is a separator 30 can be seen, which has one or more spirals 36. Depending on how long the path of the individual Mahlhilfskörper in the spiral, the fewer turns must make the separate drive 52 to accomplish a penetration of Mahlhilfskörper in the Mahlgutauslaß.

In Figur 8 wird Trenneinrichtung 30, ebenfalls mit einem getrennt von der Rührwelle 20 durch den Antrieb 52 in Rotation versetzt. Zusätzlich befindet sich die Trenneinrichtung 30 hier in einem Hohlraum innerhalb der Rührwelle 20 wodurch sie gegen übermäßigen Verschleiß durch die von der Rührwelle 20 aktivierten Mahlhilfskörper 54 weitestgehend geschützt wird. Rein schematisch ist in diesem Ausführungsbeispiel auch dargestellt, wie die Mahlhilfskörperkonzentration vom Mahlraum 48 aus in Richtung zum Mahlgutauslaß 34 abnimmt.In FIG. 8 Separator 30, also with a separate from the agitator shaft 20 by the drive 52 in rotation. In addition, the separator 30 is here in a cavity within the agitator shaft 20 whereby it is largely protected against excessive wear by the Mahlhilfskörper 54 activated by the stirring shaft 20. In this exemplary embodiment, it is also shown purely schematically how the grinding assistant body concentration decreases from the grinding chamber 48 in the direction of the grinding stock outlet 34.

Die Figuren 9 und 10 lassen erkennen, daß die Trenneinrichtung mit einer rechts- sowie linksdrehenden Spirale arbeitet. Es kommt im Endeffekt nicht darauf an, daß die Spirale in entgegengesetzter Drehrichtung wie die Rührwelle umläuft. Die Funktion der Spirale ist unabhängig von der Drehrichtung der Rührwelle.The FIGS. 9 and 10 let recognize that the separator operates with a right- and left-handed spiral. It does not matter in the end that the spiral rotates in the opposite direction of rotation as the agitator shaft. The function of the spiral is independent of the direction of rotation of the stirrer shaft.

Bei der in Figur 11 dargestellten Rührwerkskugelmühle rotiert die Trenneinrichtung 30 mit der Rührwelle 20 synchron. Die Spirale 36 der Trennvorrichtung liegt mit ihrer linken Seite an der Rührwelle an und wird mit der rechten Seite durch ein Spannelement 56 mit der Rührwelle verspannt. Zentrisch in der Längsmitte der Spirale befindet sich im Bereich der Längsachse der Rührwelle 20 der Einlaß 58 des Mahlgutauslasses 34. Die Figur 12 verdeutlicht in diesem Fall die Länge der Spirale 36, die hier einen Bereich von 630° umfaßt.At the in FIG. 11 shown agitator ball mill rotates the separator 30 synchronously with the agitator shaft 20. The spiral 36 of the separator abuts with its left side on the agitator shaft and is clamped to the right side by a clamping element 56 with the agitator shaft. Centrally in the longitudinal center of the spiral is located in the region of the longitudinal axis of the agitator shaft 20 of the inlet 58 of the Mahlgutauslasses 34th Die FIG. 12 illustrates in this case, the length of the spiral 36, which here covers a range of 630 °.

Die Gestaltung der Trenneinrichtung gemäß den Figuren 13, 14 und 15 ist insbesondere für hochviskose Stoffe ausgerichtet. Da in hochviskosen Stoffen die Athäsionskräfte zwischen dem Produkt und dem Mahlhilfskörpern sehr hoch sind, benötigt man einen längeren Weg zur Abtrennung der Mahlhilfskörper, weshalb in Figur 13 zwei Spiralen 36 vorgesehen sind. Dabei wirken die äußeren Oberflächen der Spiralen jeweils bis zum Beginn der weiteren Schnecke wie Abweiser. Das bedeutet, daß diese Flächen 60 einen pulsierenden Effekt in Richtung Mahlraum erzeugen und somit schon am Umfang der Trenneinrichtung ein Umlenken der Mahlhilfskörper in Richtung Mahlraum bewirken. Darüber hinaus werden die Mahlhilfskörper im Verlauf der Spiralgänge, die sich über 1080° erstrecken ständig durch die Reibungskräfte an den Spiralwandungen und die umgekehrte Förderrichtung zu Rückkehr in den Mahlraum gezwungen.The design of the separator according to the FIGS. 13, 14 and 15 is especially designed for high-viscosity substances. Since in high-viscosity materials, the forces of resistance between the product and the Mahlhilfskörpern are very high, you need a longer way to separate the Mahlhilfskörper, why in FIG. 13 two spirals 36 are provided. The outer surfaces of the spirals act as deflectors until the beginning of the other screw. This means that these surfaces 60 produce a pulsating effect in the direction of the grinding chamber and thus already cause a deflection of the auxiliary grinding bodies in the direction of the grinding chamber at the periphery of the separating device. In addition, in the course of the helical flights that extend over 1080 °, the auxiliary grinding bodies are constantly forced to return to the grinding chamber by the frictional forces on the spiral walls and the reverse conveying direction.

In der Figur 14 wird der Einsatz der in der Figur 13 beschriebenen Spiralen 36 dargestellt. Die Trenneinrichtung befindet sich hier direkt an der Stirnseite der fliegend gelagerten Rührwelle 20. Das Produkt fließt zentrisch über die Rührwelle 20 und Lagerwelle 18 ab.In the FIG. 14 will be the use of in the FIG. 13 described spirals 36 shown. The separator is located here directly on the front side of the overhung agitator shaft 20. The product flows centrally via the agitator shaft 20 and bearing shaft 18 from.

In Figur 15 weist der Mahlbehälterboden 28 einen Vorsprung 60 auf. In diesem Bereich ist die Spirale 36 in Richtung Vorsprung offen, so daß Mahlhilfskörper auf kurzem Wege zurück in den Mahlraum 48 fließen können. Der Äußere Bereich der Spirale 36 ist durch einen Ring 62 begrenzt.In FIG. 15 the grinding container bottom 28 has a projection 60. In this area, the spiral 36 is open in the direction of projection so that Mahlhilfskörper can flow back into the grinding chamber 48 on a short path. The outer region of the spiral 36 is bounded by a ring 62.

Die Figuren 16 und 17 zeigen Trennvorrichtungen mit zwei Spiralen, die sich jeweils über einen Bereich von 500° und 560° erstrecken. Die beiden Spiralen haben Schneckengänge mit stets konstanten Wandungsabstand A. Die Trenneinrichtung 30 rotiert gemeinsam mit der Rührwelle 20, wobei der Produktauslaß durch die Rührwelle 20 und Lagerwelle 18 erfolgt. Zur Vermeidung von Todzonen in denen keine Mahlgutmahlkörperströmung erzeugt wird, ist der Trennvorrichtung ein Vorsprung 60 gestaltet, der zur Strömungsbildung genutzt wird. Die Rührwelle weist in diesem Ausführungsbeispiel keine Mahlstifte 31, sondern Nocken 62 auf.The FIGS. 16 and 17 show separation devices with two spirals, each extending over a range of 500 ° and 560 °. The two spirals have screw threads with always constant wall distance A. The separating device 30 rotates together with the agitator shaft 20, the product outlet being effected by the agitator shaft 20 and the bearing shaft 18. In order to avoid dead zones in which no Mahlgutmahlkörperströmung is generated, the separator is a projection 60 designed, which is used for flow formation. The agitator shaft has in this embodiment, no grinding pins 31, but cam 62.

Die Figuren 18, 19, 20 und 21 demonstrieren die Lage und die Gestaltung von Trenneinrichtungen mit Spiralen, deren Abstand wie in Figur 18 konstant, in Figur 19 reduzierend und in Figur 20 erweiternd ausgeführt sind. Die Figur 18 entspricht hier der Figur 16, bei der der Abstand A konstant über die gesamte Anordnung der beiden Spiralen 36 bleibt. In Figur 19 sind die Spiralen 36 so angeordnet, daß sich der Abstand B vom Mahlraum zum Auslaß hin reduziert. Diese Variante findet insbesondere dann Einsatz, wenn niedrig viskoses Material zum Einsatz kommt und damit gerechnet werden muß, daß die Rührwerkskugelmühle kurzzeitig außer Betrieb gesetzt wird. Durch den sich reduzierenden Abstand zwischen den beiden Spiralen, wird die selbst hemmende Wirkung zwischen den Spiralwänden und den Mahlhilfskörpern verstärkt. Durch die Anordnung der beiden Spiralen gemäß Figur 20 kann man einen schnelleren Abfluß des Produkts nach der Trennung von den Mahlhilfskörpern erreichen. Die dargestellte Geometrie der beiden Spiralen 36 zeigt, daß sich der Abstand C in der Richtung vom Mahlraum zum Mahlgutauslaß vergrößert.The FIGS. 18, 19, 20 and 21 demonstrate the location and design of separators with spirals whose spacing is as in FIG. 18 constant, in FIG. 19 reducing and in FIG. 20 are executed widening. The FIG. 18 corresponds to the here FIG. 16 in which the distance A remains constant over the entire arrangement of the two spirals 36. In FIG. 19 the spirals 36 are arranged so that the distance B is reduced from the grinding chamber to the outlet. This variant is used in particular when low-viscosity material is used and thus it must be expected that the agitator ball mill will be put out of operation for a short time. Due to the reducing distance between the two spirals, the self-inhibiting effect between the spiral walls and the auxiliary grinding bodies is enhanced. Due to the arrangement of the two spirals according to FIG. 20 you can achieve a faster flow of the product after separation from the Mahlhilfskörpern. The illustrated geometry of the two spirals 36 shows that the distance C increases in the direction from the grinding chamber to the Mahlgutauslaß.

Eine weitere Möglichkeit um Mahlhilfskörper aus dem Bereich der Trennvorrichtung seitlich aus den Spiralgängen zurück in den Mahlraum zu fördern, ist in Figur 23 dargestellt. Hier sitzt die Trennvorrichtung 30 innerhalb eines innerhalb der Rührwelle einseitig offenen Hohlraums 64. Die Spirale 36 wird von der Rührwelle 20 gehalten. An der zum Mahlbehälterboden 28 weisenden Stirnseite der Spirale 36 befindet sich ein Ring 66, der jeden Spiralgang mit dem Hohlraum 64 verbindet und somit den Mahlhilfskörpern die Möglichkeit bietet, aus der Spirale über den Hohlraum in den Mahlraum 48 zurück zu fließen. Der Ring weist einen Schlitz 68 auf, durch den die Mahlhilfskörper über den Hohlraum 64 zurück in den Mahlraum fließen können. Das bearbeitete Mahlgut verläßt den Mahlraum aus dem zentrischen Bereich innerhalb der Spirale/n 36 über ein Tauchrohr 70. Wie aus Figur 22 hervorgeht, weist diese Trenneinrichtung nur eine Spirale 36 auf.Another possibility for conveying auxiliary grinding bodies from the area of the separating device laterally out of the spiral passages back into the grinding chamber is in FIG. 23 shown. Here, the separating device 30 is seated within a cavity 64 which is open on one side within the agitator shaft. The spiral 36 is held by the agitator shaft 20. At the end of the spiral 36 facing the grinding container bottom 28 there is a ring 66 which connects each spiral passage to the cavity 64 and thus offers the auxiliary grinding bodies the opportunity to flow back from the spiral via the cavity into the grinding chamber 48. The ring has a slot 68 through which the Mahlhilfskörper can flow via the cavity 64 back into the grinding chamber. The processed ground material leaves the grinding chamber from the central region within the spiral / s 36 via a dip tube 70. As out FIG. 22 shows, this separator has only one spiral 36.

Claims (29)

  1. A stirring ball mill comprising a cylindrical milling container (26) which has at least one milling material inlet (24) and at least one milling material outlet (34), wherein within the milling container (26), an agitator shaft (20) is arranged which is connected to a drive (12) and which transmits a portion of the drive energy to auxiliary milling bodies (54) which are loosely arranged within the milling container (26), and a separator (30) arranged before the milling material outlet (34),
    characterized in
    that the separator (30) consists of at least one spiral (36).
  2. The stirring ball mill according to claim 1,
    characterized in
    that the separator (30) consists of two spirals (36).
  3. The stirring ball mill according to claim 1,
    characterized in
    that the spirals are arranged at a constant distance from one another.
  4. The stirring ball mill according to claim 1,
    characterized in
    that the spirals (36) are arranged at a different distance from one another.
  5. The stirring ball mill according to claim 1,
    characterized in
    that the radial inner end of the spiral(s) (36) ends directly at the milling material outlet (34).
  6. The stirring ball mill according to claim 1,
    characterized in
    that the milling material outlet (34) extends on both sides from the longitudinal center of the spiral(s) (36).
  7. The stirring ball mill according to claim 1,
    characterized in
    that the spiral(s) (36) extend around a circumference of at least 180°.
  8. The stirring ball mill according to claim 7,
    characterized in
    that the spirals (36) extend around a circumference of at least 360°.
  9. The stirring ball mill according to claim 1,
    characterized in
    that the width of the spiral(s) (36) is at least 1/3 of its (their) diameter.
  10. The stirring ball mill according to claim 1,
    characterized in
    that the spiral(s) (36) is (are) set in rotation by a drive (52) which is independent of the agitator shaft (20).
  11. The stirring ball mill according to any one of the claims 1 to 10,
    characterized in
    that the separator (30) consisting of at least one spiral (36) is arranged between the agitator shaft surface and the longitudinal axis of the agitator shaft (20).
  12. The stirring ball mill according to claim 11,
    characterized in
    that the agitator shaft (20) is formed hollow in the region of the spiral(s) (36) and has openings.
  13. The stirring ball mill according to claim 12,
    characterized in
    that the apertures (46) are formed as parallel slots, the inclination of which is directed against the rotational direction of the agitator shaft (20).
  14. The stirring ball mill according to claim 13,
    characterized in
    that the apertures (46) in the agitator shaft (20) run tangentially or asymmetrically to the longitudinal axis of the same.
  15. The stirring ball mill according to claim 11,
    characterized in
    that the agitator shaft (20) has agitator rods (38) or cams (62) in the region of the spiral(s) (36).
  16. The stirring ball mill according to claim 15,
    characterized in
    that the agitator rods (38) or cams (62) are offset by at least 45° with respect to one another.
  17. The stirring ball mill according to claim 11,
    characterized in
    that the spiral(s) (36) is (are) connected to the agitator shaft (20).
  18. The stirring ball mill according to claim 1,
    characterized in
    that the milling material outlet (34) is implemented through the agitator shaft (20).
  19. The stirring ball mill according to claim 1,
    characterized in
    that the milling material outlet (34) is implemented through a static immersion tube (70) arranged in the center of the spiral (36).
  20. The stirring ball mill according to any one of the preceding claims,
    characterized in
    that the spiral(s) (36) consist of individual rods which are spaced apart from one another.
  21. The stirring ball mill according to any one of the preceding claims,
    characterized in
    that the diameter of the spirals (36) is at least 30% of the milling chamber diameter.
  22. The stirring ball mill according to any one of the preceding claims,
    characterized in
    that the diameter of the spiral(s) (36) is at least 30% of the diameter of the hollow space in the stirring ball mill.
  23. The stirring ball mill according to any one of the preceding claims,
    characterized in
    that the spiral(s) (36) is (are) inserted laterally between two full surface end faces.
  24. The stirring ball mill according to any one of the preceding claims,
    characterized in
    that the spiral (s) (36) has an (have) end face(s) provided with openings on one or both sides.
  25. The stirring ball mill according to any one of the preceding claims,
    characterized in
    that a displacer (60) engages laterally with the spiral (s) (36).
  26. The stirring ball mill according to any one of the preceding claims,
    characterized in
    that the milling container (26) is arranged horizontally.
  27. The stirring ball mill according to any one of the preceding claims,
    characterized in
    that at least one lateral holder on the spiral (36) is provided with slots (68) at one or more positions at a radial distance to the milling material outlet (34).
  28. The stirring ball mill according to any one of the preceding claims,
    characterized in
    that at least one of the inner or outer surfaces of the spiral(s) (36) has a structured surface structure.
  29. The stirring ball mill according to claim 1,
    characterized in
    that the radially outer ends of a plurality of spirals (36) are offset in each case by at least 90° with respect to one another.
EP08014106A 2007-09-13 2008-08-07 Stirring ball mill Active EP2036613B1 (en)

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KR (1) KR101554464B1 (en)
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AT (1) ATE489172T1 (en)
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CN101385989A (en) 2009-03-18
KR20090028412A (en) 2009-03-18
EP2036613A3 (en) 2009-11-25
BRPI0803553A2 (en) 2009-05-05
CN101385989B (en) 2013-02-06
JP2009066595A (en) 2009-04-02
DE502008001873D1 (en) 2011-01-05
ATE489172T1 (en) 2010-12-15
BRPI0803553B1 (en) 2020-09-29
JP4879947B2 (en) 2012-02-22
KR101554464B1 (en) 2015-09-21
TW200916194A (en) 2009-04-16
TWI410281B (en) 2013-10-01
ES2355415T3 (en) 2011-03-25
US7845589B2 (en) 2010-12-07
US20090072060A1 (en) 2009-03-19
DE102007043670A1 (en) 2009-04-02
EP2036613A2 (en) 2009-03-18

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