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EP0700723B1 - Agitator mill - Google Patents

Agitator mill Download PDF

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Publication number
EP0700723B1
EP0700723B1 EP95113212A EP95113212A EP0700723B1 EP 0700723 B1 EP0700723 B1 EP 0700723B1 EP 95113212 A EP95113212 A EP 95113212A EP 95113212 A EP95113212 A EP 95113212A EP 0700723 B1 EP0700723 B1 EP 0700723B1
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EP
European Patent Office
Prior art keywords
grinding
agitator
chamber
cage
auxiliary
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95113212A
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German (de)
French (fr)
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EP0700723A1 (en
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Draiswerke GmbH
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Draiswerke GmbH
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Publication of EP0700723A1 publication Critical patent/EP0700723A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • 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
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge

Definitions

  • the invention relates to an agitator mill.
  • EP 0 058 886 A2 (corresponding to US Pat. No. 4,496,106) is an agitator mill known, which has a grinding aid return line, which opens out of the grinding container in front of a grinding aid separating device and those at the other end of the grinding container back into the grinding room flows into.
  • a regrind feed line opens immediately before this junction into the grinding aid return line.
  • the grinding aid and also not yet sufficiently comminuted regrind should the centrifugal effect generated by the agitator through the auxiliary grinder outlet opening be thrown out and through the grinding media return line to be led back.
  • Through the mouth of the grinding aid return line a suction effect is intended in the regrind feed line are generated, which still supports the centrifuging effect.
  • An agitator mill is known from EP 0 370 022 B1 (corresponding to US Pat. No. 5,062,577) known, which also has a cylindrical grinding chamber has cylindrical inner stator.
  • a cup-shaped rotor In the annulus between the wall and the inner stator is immersed in a cup-shaped rotor that has an annular one Outer grinding room and an annular inner grinding room, those in the area of the free end of the rotor with one another through a deflection space are connected.
  • In the area of the rotor base there are overflow channels educated.
  • a regrind inlet area is also assigned to this area.
  • the area of these overflow channels is a grinding aid retention device downstream in the direction of flow.
  • the regrind inlet area is added regrind, which together with auxiliary grinding bodies through the outside grinding area, the deflection area and the inside grinding area flows, interacting due to the rotation of the rotor is ground and dispersed with the grinding aids.
  • the Auxiliary grinding media are removed before reaching the auxiliary grinding media retention device through the overflow channels back into the regrind inlet area hurled.
  • the ground material exits through the retention device.
  • an agitator mill which one Grinding bowl with a cylindrical inner wall and a cylindrical one Agitator, wherein between the agitator and the inner wall of the An annular cylindrical grinding chamber is formed.
  • the agitator has at its free end a cavity into which a separating device protrudes. In this area the agitator is all around Separator provided with recesses that the of the Front of the free shaft end of the grinding aid body entering the cavity Let it radially exit into the neighboring grinding chamber. It there is a risk that in the area of the free shaft end, ie around the Cavity around, pressing of grinding aids occurs.
  • SU-PS 737 004 is an agitator mill with a vertical agitator known.
  • the ground material is fed into the area of the bottom of the grinding container and below the lid of the grinding container through a cylinder sieve deducted.
  • the agitator shaft is hollow and to her open end adjacent to the floor. About the height of the agitator shaft there are several openings. Through this configuration should be achieved that auxiliary grinding bodies that settle on the ground, rise through the agitator shaft and spread over the height of the grinding chamber be thrown into the grinding chamber.
  • the invention has for its object to provide an agitator mill in which pressing of grinding aids is avoided.
  • Grist feed opening and grist outlet are located at the same end of the grinding room.
  • the one from the cage-like section ejected grinding aids enter the regrind inlet space, from where they flow with the regrind into the actual grinding chamber brought where the grinding process takes place.
  • the grinding aid retainer will be like the one after the EP 0 370 022 B1 (corresponding to US Pat. No. 5,062,577) not in any way relevant dimensions with auxiliary grinding bodies, is therefore not subject to any significant wear.
  • auxiliary grinding bodies ensures what contributes to an optimization of the grinding result and to a trouble-free Operation with high throughputs contributes, since none in the overall system Grinding auxiliary body pressures occur.
  • the measures according to the invention can be used with vertical mills, horizontal mills Agitator or inclined to the horizontal or vertical Agitator can be applied.
  • a lying agitator mill This has one in the usual way Stand 1, which is supported on the floor 2. On the front side 3 of the stand 1, a support arm 4 is attached.
  • a drive motor 5 which may be speed-controllable housed, which is provided with a V-belt pulley 6, of the via V-belt 7 and a further V-belt pulley 8 a drive shaft 9 is drivable.
  • the drive shaft 9 is in the stand 1 by means of several Bearing 10 rotatably mounted.
  • the grinding container 12 has a cylindrical wall 13 and is on one, the stand 1 facing End by means of a cover 14 and at the opposite end closed by a bottom 15. It encloses a grinding room 16.
  • an agitator shaft 18 is arranged in grinding chamber 16, which penetrates the lid 14.
  • the grinding chamber 16 is by means of seals 19 sealed between the cover 14 and the shaft 18.
  • the shaft is 18 flying, i.e. no longer stored in the area of the floor. It is over provided their length in the grinding chamber 16 with stirring tools 20, in which it in the present case, stirring discs 21 are involved.
  • openings 22 can be formed in a conventional manner.
  • a regrind feed connection 23 attached, which opens into the grinding chamber 16.
  • FIG. 2 has the regrind feed opening 24 of the inlet connection opening into the grinding chamber 16 23 the shape of a circular ring section.
  • the agitator shaft 18 is hollow, i.e. it shows itself inner regrind auxiliary return duct extending over its length 25, which serves as regrind auxiliary body return space and adjacent to the lid 14 of the grinding container 12 by means of inlet channels 26 is connected to the grinding chamber. These inlet channels 26 are from the grinding chamber 16 to the regrind auxiliary body return duct 25 in the direction of Bottom 15 inclined, as can be clearly seen in FIG. 1. Outdoors The end of the agitator shaft 18, ie adjacent to the bottom 15, is a cage-like one Section 27 attached, which delimits an interior 28.
  • cage-like section 27 is attached to the agitator shaft 18 Washer 29 and one extending from this to the bottom 15 Cylinder 30 formed in parallel to the central longitudinal axis 17 extending through channels 31 are located.
  • the one with through channels 31 provided cage-like section 27 defines a wall 13 annular regrind inlet space into which the regrind feed opening 24 opens out, which extends over the full radial width of the inlet space 32.
  • the cylinder 30 extends very close to the bottom 15, so that between the open end of the cage 27 by a ring 33 closed cylinder 30 and the bottom 15 only a gap 34 very small width a is in the range of less than 1 mm to a few Millimeters, for example 3 mm.
  • a grinding aid retaining device 35 is arranged at which is a cylindrical slotted screen 36. This concludes a ground material outlet 37 penetrating the bottom 15.
  • the grinding chamber 16 is to a large extent with auxiliary grinding bodies 40 in the size of 0.2 to 3.0 mm, usually up to 2.0 mm, diameter filled.
  • the ground material is removed from a storage container 41 by means of a pump 42 entered through the regrind supply pipe 23 into the inlet space 32. It flows according to the flow direction arrows 43 together with the grinding auxiliary bodies 40 the grinding chamber 16 in the direction of the cover 14, wherein Grist and grinding aid 40 from the high-speed driven Stirring tools 20 are applied, which in a known manner Grinding and dispersing process takes place.
  • Reflux-grinding aid flow is diverted and through the inlet channels 26 in the regrind auxiliary body return duct 25 of the agitator shaft 18 is guided, this mixture until it enters the interior 28 of the cage 27 flows through.
  • the deflection disk 39 ensures that the material to be ground and the grinding aid flow is deflected radially outwards, with regrind and grinding aid body 40 in the gap 44 between the washer 29 and Deflection disk 39 accelerates in the direction of rotation 45 of the agitator shaft 18 become. If the grinding aid body 40 from the gap 44 adjacent to the Cylinders 30 enter the interior 28 of the cage 27, they become radial to the axis 17 to the outside through the passage channels 31 in the Grist inlet space 32 flung off. The regrind is, however, by the slotted screen 36 and then the grist outlet 37 from the mill derived. The auxiliary grinding bodies flung into the regrind inlet space 32 40 are of the regrind fed through the inlet connection 23 detected and transported back to the grinding chamber 16.
  • Fig. 3 is a device 46 for cleaning the in the agitator shaft 18 trained regrind auxiliary body return channel 25 of regrind and grinding auxiliary bodies 40 are shown.
  • the drive shaft 9 is alike as the agitator shaft 18 is designed as a hollow shaft and is with the Agitator shaft 18 rotatably connected. In it is a sliding sleeve 47 in Direction of the central longitudinal axis 17 guided. It is opposite the drive shaft 9 and thus also with respect to the agitator shaft 18 non-rotatable.
  • the pipe coupling 48 is provided with a hose connection 51, in the a hose can be screwed in through which compressed gas or for cleaning Flushing liquid can be supplied under pressure.
  • the sliding sleeve 47 extends over the connection 52 between the Drive shaft 9 and the agitator shaft 18, at this end the sliding sleeve 47, an annular locking piston 53 is attached.
  • the sealing piston 53 lies against the inner wall 54 of the return duct 25 sealing.
  • it consists of a suitable material, for example made of PTFE or the like.
  • the length b of the sealing piston 53 in the direction of the axis 17 is at least somewhat larger than the diameter c of the inlet channels 26 or their extension in the direction of the axis 17, so that the inlet channels 26 are closed with the sealing piston 53 can be, as shown in Fig. 3 below.
  • the sliding sleeve 47 is again a displacement d between their two in FIG.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Abstract

The mill with a stirring mechanism has a material container (12) with a cylindrical wall (13) and a first face wall, ie. a cover (14) and a second face wall, ie. a floor (15), limiting a material chamber (16). In the material container there is a stirring mechanism, which has a stirring mechanism shaft (18) located outside the material chamber and with a free end, and a stirring tool (20) attached to it. A drive motor (5) provides high speed drive to the stirring mechanism, with a cage-type section (27) at the free end of the stirring mechanism shaft, next to the second face wall, and limiting an inner space (28). A ring-cylindrical material inlet chamber (32) is provided between the cage-type section limiting an inner space and the wall of the material container.

Description

Die Erfindung betrifft eine Rührwerksmühle.The invention relates to an agitator mill.

Aus der EP 0 058 886 A2 (entsprechend US-PS 4 496 106) ist eine Rührwerksmühle bekannt, die eine Mahlhilfskörper-Rückführ-Leitung aufweist, die vor einer Mahlhilfskörper-Trenneinrichtung aus dem Mahlbehälter ausmündet und die am anderen Ende des Mahlbehälters wieder in den Mahlraum einmündet. Unmittelbar vor dieser Einmündung mündet eine Mahlgutzuführleitung in die Mahlhilfskörper-Rückführ-Leitung. Die Mahlhilfskörper und auch noch nicht ausreichend zerkleinertes Mahlgut sollen aufgrund der vom Rührwerk erzeugten Zentrifugalwirkung durch die Mahlhilfskörper-Auslaßöffnung ausgeschleudert werden und durch die Mahlkörper-Rückführ-Leitung zurückgeführt werden. Durch die Einmündung der Mahlhilfskörper-Rücklaufleitung in die Mahlgut-Zuführleitung soll eine Saugwirkung erzeugt werden, die die Zentrifugierwirkung noch unterstützt. Außerdem soll eine gute Vormischung von Mahlgut und Mahlhilfskörpern in der Mahlgut-Zuführleitung entstehen. Es hat sich gezeigt, daß durch die Ausgestaltung der bekannten Rührwerksmühle ein zuverlässiger Mahlhilfskörper-Umlauf nicht erreichbar ist. Die Mahlhilfskörper setzen sich in der Mahlhilfskörper-Rückführ-Leitung fest und verbleiben dort. Obwohl derartige Rührwerksmühlen von der Grundkonzeption her erhebliche Vorteile aufweisen, wenn mit hohem Mahlgut-Durchsatz gearbeitet werden soll, bei dem also ein ausgeprägter Transport der Mahlhilfskörper im Mahlraum zur Trenneinrichtung erfolgt, hat sich diese Art von Rührwerksmühlen in der Praxis nicht durchsetzen können, da der Mahlhilfskörper-Umlauf nicht zufriedenstellend arbeitet. EP 0 058 886 A2 (corresponding to US Pat. No. 4,496,106) is an agitator mill known, which has a grinding aid return line, which opens out of the grinding container in front of a grinding aid separating device and those at the other end of the grinding container back into the grinding room flows into. A regrind feed line opens immediately before this junction into the grinding aid return line. The grinding aid and also not yet sufficiently comminuted regrind should the centrifugal effect generated by the agitator through the auxiliary grinder outlet opening be thrown out and through the grinding media return line to be led back. Through the mouth of the grinding aid return line a suction effect is intended in the regrind feed line are generated, which still supports the centrifuging effect. Furthermore a good premix of regrind and auxiliary grinding media in the Grist feed line is created. It has been shown that by the design the well-known agitator mill a reliable grinding auxiliary circulation is not available. The grinding aids settle in the Grinding auxiliary body return line firmly and remain there. Although such The basic concept of agitator mills offers considerable advantages if you want to work with high regrind throughput, at thus a pronounced transport of the grinding aids in the grinding chamber Separation device takes place, this type of agitator mills in the Can not enforce practice because the grinding aid circulation is not satisfactory is working.

Aus der EP 0 370 022 B1 (entsprechend US-PS 5 062 577) ist eine Rührwerksmühle bekannt, die einen zylindrischen Mahlraum mit einem ebenfalls zylindrischen Innen-Stator aufweist. In den Ringraum zwischen der Wand und dem Innen-Stator taucht ein topfförmiger Rotor ein, der einen ringförmigen Außenmahlraum und einen ringförmigen Innenmahlraum begrenzt, die im Bereich des freien Endes des Rotors durch einen Umlenkraum miteinander verbunden sind. Im Bereich des Rotorbodens sind Überströmkanäle ausgebildet. Diesem Bereich ist auch ein Mahlguteinlaßbereich zugeordnet. Außerdem ist dem Bereich dieser Überströmkanäle eine Mahlhilfskörper-Rückhalteeinrichtung in Strömungsrichtung nachgeordnet. Durch den Mahlguteinlaßbereich wird Mahlgut zugegeben, das zusammen mit Mahlhilfskörpern durch den Außenmahlraum, den Umlenkraum und den Innenmahlraum strömt, wobei es aufgrund der Rotation des Rotors im Zusammenwirken mit den Mahlhilfskörpern gemahlen und dispergiert wird. Die Mahlhilfskörper werden vor Erreichen der Mahlhilfskörper-Rückhalteeinrichtung durch die Überströmkanäle zurück in den Mahlguteinlaßbereich geschleudert. Das Mahlgut tritt durch die Rückhalteeinrichtung aus. Durch diese Ausgestaltung wird eine außerordentlich gleichbleibende Mahlgutfeinheit bei gleichzeitiger weitestgehender Verschleißfreiheit der Rückhalteeinrichtung erreicht, wodurch außerdem Betriebsstörungen ausgeschlossen werden.An agitator mill is known from EP 0 370 022 B1 (corresponding to US Pat. No. 5,062,577) known, which also has a cylindrical grinding chamber has cylindrical inner stator. In the annulus between the wall and the inner stator is immersed in a cup-shaped rotor that has an annular one Outer grinding room and an annular inner grinding room, those in the area of the free end of the rotor with one another through a deflection space are connected. In the area of the rotor base there are overflow channels educated. A regrind inlet area is also assigned to this area. In addition, the area of these overflow channels is a grinding aid retention device downstream in the direction of flow. By the The regrind inlet area is added regrind, which together with auxiliary grinding bodies through the outside grinding area, the deflection area and the inside grinding area flows, interacting due to the rotation of the rotor is ground and dispersed with the grinding aids. The Auxiliary grinding media are removed before reaching the auxiliary grinding media retention device through the overflow channels back into the regrind inlet area hurled. The ground material exits through the retention device. By this configuration becomes an extraordinarily constant grind fineness with simultaneous largely free wear of the restraint reached, which also eliminates malfunctions become.

Aus der EP 0 146 852 B1 ist eine Rührwerksmühle bekannt, die einen Mahlbehälter mit einer zylindrischen Innenwand und ein zylindrisches Rührwerk aufweist, wobei zwischen dem Rührwerk und der Innenwand des Mahlbehälters ein ringzylindrischer Mahlraum gebildet wird. Das Rührwerk weist an seinem freien Ende einen Hohlraum auf, in den eine Trenneinrichtung hineinragt. In diesem Bereich ist das Rührwerk rings um die Trenneinrichtung herum mit Ausnehmungen versehen, die die von der Stirnseite des freien Wellenendes in den Hohlraum gelangenden Mahlhilfskörper radial wieder in den benachbarten Mahlraum austreten lassen. Es besteht die Gefahr, daß im Bereich des freien Wellenendes, also um den Hohlraum herum, eine Verpressung von Mahlhilfskörpern eintritt. From EP 0 146 852 B1 an agitator mill is known, which one Grinding bowl with a cylindrical inner wall and a cylindrical one Agitator, wherein between the agitator and the inner wall of the An annular cylindrical grinding chamber is formed. The agitator has at its free end a cavity into which a separating device protrudes. In this area the agitator is all around Separator provided with recesses that the of the Front of the free shaft end of the grinding aid body entering the cavity Let it radially exit into the neighboring grinding chamber. It there is a risk that in the area of the free shaft end, ie around the Cavity around, pressing of grinding aids occurs.

Aus der SU-PS 737 004 ist eine Rührwerksmühle mit vertikalem Rührwerk bekannt. Das Mahlgut wird im Bereich des Bodens des Mahlbehälters zugeführt und unterhalb des Deckels des Mahlbehälters durch ein Zylindersieb abgezogen. Die Rührwerkswelle ist hohl ausgebildet und zu ihrem freien, dem Boden benachbarten Ende hin offen. Über die Höhe der Rührwerkswelle sind mehrere Öffnungen angebracht. Durch diese Ausgestaltung soll erreicht werden, daß Mahlhilfskörper, die sich am Boden absetzen, durch die Rührwelle hochsteigen und über die Höhe des Mahlraumes verteilt in den Mahlraum abgeschleudert werden.SU-PS 737 004 is an agitator mill with a vertical agitator known. The ground material is fed into the area of the bottom of the grinding container and below the lid of the grinding container through a cylinder sieve deducted. The agitator shaft is hollow and to her open end adjacent to the floor. About the height of the agitator shaft there are several openings. Through this configuration should be achieved that auxiliary grinding bodies that settle on the ground, rise through the agitator shaft and spread over the height of the grinding chamber be thrown into the grinding chamber.

Der Erfindung liegt die Aufgabe zugrunde, eine Rührwerksmühle zu schaffen, bei der eine Verpressung von Mahlhilfskörpern vermieden wird.The invention has for its object to provide an agitator mill in which pressing of grinding aids is avoided.

Diese Aufgabe wird bei einer Rührwerksmühle mit den Merkmalen des Anspruches 1 gelöst. Mahlgut-Zuführöffnung und Mahlgut-Auslaß befinden sich am selben Ende des Mahlraums. Die aus dem käfigartigen Abschnitt ausgeschleuderten Mahlhilfskörper gelangen in den Mahlgut-Einlaßraum, von wo aus sie mit der Mahlgutströmung in den eigentlichen Mahlraum gebracht werden, wo der Mahlprozeß stattfindet. Die Mahlhilfskörper-Rückhaltevorrichtung wird gleichermaßen, wie diejenige nach der EP 0 370 022 B1 (entsprechend US-PS 5 062 577) nicht in einem irgendwie relevanten Maße mit Mahlhilfskörpern beaufschlagt, unterliegt also keinem wesentlichen Verschleiß. Andererseits ist im eigentlichen Mahlraum eine weitestgehend gleichmäßige Mahlhilfskörperverteilung gewährleistet, was zu einer Optimierung des Mahlergebnisses beiträgt und zu einem störungsfreien Betrieb bei hohen Durchsätzen beiträgt, da im Gesamtsystem keine Mahlhilfskörper-Verpressungen auftreten. Die erfindungsgemäßen Maßnahmen können bei Rührwerksmühlen mit vertikalem Rührwerk, horizontalem Rührwerk oder gegenüber der Horizontalen bzw. Vertikalen geneigtem Rührwerk angewendet werden.This object is achieved in an agitator mill with the features of the claim 1 solved. Grist feed opening and grist outlet are located at the same end of the grinding room. The one from the cage-like section ejected grinding aids enter the regrind inlet space, from where they flow with the regrind into the actual grinding chamber brought where the grinding process takes place. The grinding aid retainer will be like the one after the EP 0 370 022 B1 (corresponding to US Pat. No. 5,062,577) not in any way relevant dimensions with auxiliary grinding bodies, is therefore not subject to any significant wear. On the other hand, there is one in the actual grinding room largely even distribution of auxiliary grinding bodies ensures what contributes to an optimization of the grinding result and to a trouble-free Operation with high throughputs contributes, since none in the overall system Grinding auxiliary body pressures occur. The measures according to the invention can be used with vertical mills, horizontal mills Agitator or inclined to the horizontal or vertical Agitator can be applied.

Weitere vorteilhafte und zum Teil erfinderische Ausgestaltungen ergeben sich aus den Unteransprüchen.Further advantageous and partly inventive configurations result itself from the subclaims.

Weitere Merkmale, Einzelheiten und Vorteile der Erfindung ergeben sich im übrigen aus der nachfolgenden Beschreibung eines Ausführungsbeispiels anhand der Zeichnung. Es zeigt:

Fig. 1
eine Rührwerksmühle in schematischer Ansicht im vertikalen Längsschnitt,
Fig. 2
einen Querschnitt durch die Rührwerksmühle gemäß der Schnittlinie II-II in Fig. 1 und
Fig. 3
eine Einrichtung zum Reinigen der Hohlwelle der Rührwerksmühle.
Further features, details and advantages of the invention result from the following description of an embodiment with reference to the drawing. It shows:
Fig. 1
an agitator mill in a schematic view in vertical longitudinal section,
Fig. 2
a cross section through the agitator mill according to section line II-II in Fig. 1 and
Fig. 3
a device for cleaning the hollow shaft of the agitator mill.

Bei dem in der Zeichnung dargestellten Ausführungsbeispiel handelt es sich um eine liegende Rührwerksmühle. Diese weist in üblicher Weise einen Ständer 1 auf, der auf dem Boden 2 abgestützt ist. An der Vorderseite 3 des Ständers 1 ist ein Tragarm 4 angebracht.It is in the embodiment shown in the drawing a lying agitator mill. This has one in the usual way Stand 1, which is supported on the floor 2. On the front side 3 of the stand 1, a support arm 4 is attached.

Im Ständer 1 ist ein gegebenenfalls drehzahlregelbarer Antriebsmotor 5 untergebracht, der mit einer Keilriemenscheibe 6 versehen ist, von der über Keilriemen 7 und eine weitere Keilriemenscheibe 8 eine Antriebswelle 9 drehantreibbar ist. Die Antriebswelle 9 ist im Ständer 1 mittels mehrerer Lager 10 drehbar gelagert.In the stator 1 there is a drive motor 5 which may be speed-controllable housed, which is provided with a V-belt pulley 6, of the via V-belt 7 and a further V-belt pulley 8 a drive shaft 9 is drivable. The drive shaft 9 is in the stand 1 by means of several Bearing 10 rotatably mounted.

Auf dem Tragarm 4 ist in entsprechenden Aufnahmen 11 ein im wesentlichen zylindrischer Mahlbehälter 12 abgestützt. Der Mahlbehälter 12 weist eine zylindrische Wand 13 auf und ist an einem, dem Ständer 1 zugewandten Ende mittels eines Deckels 14 und am gegenüberliegenden Ende mittels eines Bodens 15 verschlossen. Er umschließt einen Mahlraum 16.On the support arm 4 is in a corresponding receptacles 11 essentially cylindrical grinding bowl 12 supported. The grinding container 12 has a cylindrical wall 13 and is on one, the stand 1 facing End by means of a cover 14 and at the opposite end closed by a bottom 15. It encloses a grinding room 16.

Konzentrisch zur gemeinsamen Mittel-Längs-Achse 17 von Mahlbehälter 12 und Antriebswelle 9 ist im Mahlraum 16 eine Rührwerks-Welle 18 angeordnet, die den Deckel 14 durchsetzt. Der Mahlraum 16 ist mittels Dichtungen 19 zwischen dem Deckel 14 und der Welle 18 abgedichtet. Die Welle 18 ist fliegend, also im Bereich des Bodens nicht mehr gelagert. Sie ist über ihre Länge im Mahlraum 16 mit Rührwerkzeugen 20 versehen, bei denen es sich im vorliegenden Fall um Rührscheiben 21 handelt. In den Rührscheiben 21 können in üblicher Weise Öffnungen 22 ausgebildet sein. Im Boden 15 und zwar benachbart zur Wand 13, ist ein Mahlgut-Zuführstutzen 23 angebracht, der in den Mahlraum 16 mündet. Wie Fig. 2 entnehmbar ist, hat die in den Mahlraum 16 mündende Mahlgut-Zuführöffnung 24 des Zulaufstutzens 23 die Form eines Kreisringabschnitts.Concentric to the common central longitudinal axis 17 of the grinding container 12 and drive shaft 9, an agitator shaft 18 is arranged in grinding chamber 16, which penetrates the lid 14. The grinding chamber 16 is by means of seals 19 sealed between the cover 14 and the shaft 18. The shaft is 18 flying, i.e. no longer stored in the area of the floor. It is over provided their length in the grinding chamber 16 with stirring tools 20, in which it in the present case, stirring discs 21 are involved. In the stirring disks 21 openings 22 can be formed in a conventional manner. In the ground 15, namely adjacent to the wall 13, is a regrind feed connection 23 attached, which opens into the grinding chamber 16. As can be seen in FIG. 2, has the regrind feed opening 24 of the inlet connection opening into the grinding chamber 16 23 the shape of a circular ring section.

Die Rührwerkswelle 18 ist hohl ausgebildet, d.h. sie weist einen sich über ihre Länge erstreckenden inneren Mahlgut-Mahlhilfskörper-Rückführkanal 25 auf, der als Mahlgut-Mahlhilfskörper-Rückführraum dient und benachbart zum Deckel 14 des Mahlbehälters 12 mittels Einlaßkanälen 26 mit dem Mahlraum verbunden ist. Diese Einlaßkanäle 26 sind vom Mahlraum 16 zum Mahlgut-Mahlhilfskörper-Rückführkanal 25 in Richtung zum Boden 15 hin geneigt, wie Fig. 1 anschaulich entnehmbar ist. Am freien Ende der Rührwerkswelle 18, also benachbart zum Boden 15, ist ein käfigartiger Abschnitt 27 angebracht, der einen Innenraum 28 begrenzt. Der käfigartige Abschnitt 27 wird durch eine an der Rührwerkswelle 18 angebrachte Ringscheibe 29 und einen sich von dieser bis zum Boden 15 erstreckenden Zylinder 30 gebildet, in dem sich parallel zur Mittel-Längs-Achse 17 erstreckende Durchtrittskanäle 31 befinden. Der mit Durchtrittskanälen 31 versehene käfigartige Abschnitt 27 begrenzt zur Wand 13 einen ringförmigen Mahlgut-Einlaßraum, in den die Mahlgut-Zuführöffnung 24 einmündet, die sich über die volle radiale Breite des Einlaßraums 32 erstreckt. Der Zylinder 30 erstreckt sich sehr nah bis an den Boden 15, so daß sich zwischen dem am offenen Ende des Käfigs 27 durch einen Ring 33 abgeschlossenen Zylinder 30 und dem Boden 15 nur ein Spalt 34 sehr geringer Breite a befindet, die im Bereich von weniger als 1 mm bis wenige Millimeter, beispielsweise 3 mm, beträgt. Im Innenraum 28 des Käfigs 27 ist eine Mahlhilfskörper-Rückhalteeinrichtung 35 angeordnet, bei der es sich um ein zylindrisches Spaltsieb 36 handelt. Hieran schließt sich ein den Boden 15 durchsetzender Mahlgut-Auslaß 37 an.The agitator shaft 18 is hollow, i.e. it shows itself inner regrind auxiliary return duct extending over its length 25, which serves as regrind auxiliary body return space and adjacent to the lid 14 of the grinding container 12 by means of inlet channels 26 is connected to the grinding chamber. These inlet channels 26 are from the grinding chamber 16 to the regrind auxiliary body return duct 25 in the direction of Bottom 15 inclined, as can be clearly seen in FIG. 1. Outdoors The end of the agitator shaft 18, ie adjacent to the bottom 15, is a cage-like one Section 27 attached, which delimits an interior 28. Of the cage-like section 27 is attached to the agitator shaft 18 Washer 29 and one extending from this to the bottom 15 Cylinder 30 formed in parallel to the central longitudinal axis 17 extending through channels 31 are located. The one with through channels 31 provided cage-like section 27 defines a wall 13 annular regrind inlet space into which the regrind feed opening 24 opens out, which extends over the full radial width of the inlet space 32. The cylinder 30 extends very close to the bottom 15, so that between the open end of the cage 27 by a ring 33 closed cylinder 30 and the bottom 15 only a gap 34 very small width a is in the range of less than 1 mm to a few Millimeters, for example 3 mm. In the interior 28 of the cage 27, a grinding aid retaining device 35 is arranged at which is a cylindrical slotted screen 36. This concludes a ground material outlet 37 penetrating the bottom 15.

Vor der Einmündung 38 des Hohlraums 25 der Rührwerkswelle 18 in den Innenraum 28 des Käfigs 27 ist an der Ringscheibe 29 eine Umlenkscheibe 39 angebracht, die sich bis in die Nähe des Zylinders 30 erstreckt.Before the mouth 38 of the cavity 25 of the agitator shaft 18 in the Interior 28 of the cage 27 is a deflection plate on the annular disc 29 39 attached, which extends to the vicinity of the cylinder 30.

Der Mahlraum 16 ist zu einem wesentlichen Teil mit Mahlhilfskörpern 40 in der Größe von 0,2 bis 3,0 mm, üblicherweise bis 2,0 mm, Durchmesser gefüllt. The grinding chamber 16 is to a large extent with auxiliary grinding bodies 40 in the size of 0.2 to 3.0 mm, usually up to 2.0 mm, diameter filled.

Das Mahlgut wird aus einem Vorratsbehälter 41 mittels einer Pumpe 42 durch den Mahlgut-Zuführstutzen 23 in den Einlaßraum 32 eingegeben. Es durchströmt entsprechend den Strömungsrichtungpfeilen 43 zusammen mit den Mahlhilfskörpern 40 den Mahlraum 16 in Richtung zum Deckel 14, wobei Mahlgut und Mahlhilfskörper 40 von den hochtourig angetriebenen Rührwerkzeugen 20 beaufschlagt werden, wodurch in bekannter Weise ein Mahl- und Dispergier-Prozeß stattfindet. Vor dem Deckel 14 wird der Mahlgut-Mahlhilfskörper-Strom umgelenkt und durch die Einlaßkanäle 26 in den Mahlgut-Mahlhilfskörper-Rückführkanal 25 der Rührwerkswelle 18 geleitet, den dieses Gemisch bis zum Eintritt in den Innenraum 28 des Käfigs 27 durchströmt. Die Umlenkscheibe 39 sorgt dafür, daß die Mahlgut-Mahlhilfskörper-Strömung radial nach außen umgelenkt wird, wobei Mahlgut und Mahlhilfskörper 40 in dem Spalt 44 zwischen Ringscheibe 29 und Umlenkscheibe 39 in Drehrichtung 45 der Rührwerkswelle 18 beschleunigt werden. Wenn die Mahlhilfskörper 40 aus dem Spalt 44 benachbart zum Zylinder 30 in den Innenraum 28 des Käfigs 27 eintreten, werden sie radial zur Achse 17 nach außen durch die Durchtrittskanäle 31 in den Mahlgut-Einlaßraum 32 abgeschleudert. Das Mahlgut wird dagegen durch das Spaltsieb 36 und anschließend den MahlgutAuslaß 37 aus der Mühle abgeleitet. Die in den Mahlgut-Einlaßraum 32 geschleuderten Mahlhilfskörper 40 werden von dem durch den Zulaufstutzen 23 zugeführten Mahlgut erfaßt und wieder in den Mahlraum 16 transportiert.The ground material is removed from a storage container 41 by means of a pump 42 entered through the regrind supply pipe 23 into the inlet space 32. It flows according to the flow direction arrows 43 together with the grinding auxiliary bodies 40 the grinding chamber 16 in the direction of the cover 14, wherein Grist and grinding aid 40 from the high-speed driven Stirring tools 20 are applied, which in a known manner Grinding and dispersing process takes place. In front of the lid 14 Reflux-grinding aid flow is diverted and through the inlet channels 26 in the regrind auxiliary body return duct 25 of the agitator shaft 18 is guided, this mixture until it enters the interior 28 of the cage 27 flows through. The deflection disk 39 ensures that the material to be ground and the grinding aid flow is deflected radially outwards, with regrind and grinding aid body 40 in the gap 44 between the washer 29 and Deflection disk 39 accelerates in the direction of rotation 45 of the agitator shaft 18 become. If the grinding aid body 40 from the gap 44 adjacent to the Cylinders 30 enter the interior 28 of the cage 27, they become radial to the axis 17 to the outside through the passage channels 31 in the Grist inlet space 32 flung off. The regrind is, however, by the slotted screen 36 and then the grist outlet 37 from the mill derived. The auxiliary grinding bodies flung into the regrind inlet space 32 40 are of the regrind fed through the inlet connection 23 detected and transported back to the grinding chamber 16.

Durch die geschilderten Maßnahmen findet also eine interne Zirkulation der Mahlhilfskörper 40 entsprechend den Strömungsrichtungspfeilen 43 über die volle Länge des Mahlraums 16 statt. Ein Kurzschluß zwischen dem Mahlgut-Zuführstutzen 23 und dem Innenraum 28 des Käfigs 27 ist ausgeschlossen.An internal circulation takes place through the described measures the grinding aid body 40 according to the flow direction arrows 43 over the full length of the grinding chamber 16 instead. A short circuit between the Regrind supply pipe 23 and the interior 28 of the cage 27 is excluded.

In Fig. 3 ist eine Einrichtung 46 zum Reinigen des in der Rührwerkswelle 18 ausgebildeten Mahlgut-Mahlhilfskörper-Rückführkanals 25 von Mahlgut und Mahlhilfskörpern 40 dargestellt. Die Antriebswelle 9 ist gleichermaßen wie die Rührwerkswelle 18 als Hohlwelle ausgebildet und ist mit der Rührwerkswelle 18 drehfest verbunden. In ihr ist eine Schiebehülse 47 in Richtung der Mittel-Längs-Achse 17 verschiebbar geführt. Sie ist gegenüber der Antriebswelle 9 und damit auch gegenüber der Rührwerkswelle 18 unverdrehbar.In Fig. 3 is a device 46 for cleaning the in the agitator shaft 18 trained regrind auxiliary body return channel 25 of regrind and grinding auxiliary bodies 40 are shown. The drive shaft 9 is alike as the agitator shaft 18 is designed as a hollow shaft and is with the Agitator shaft 18 rotatably connected. In it is a sliding sleeve 47 in Direction of the central longitudinal axis 17 guided. It is opposite the drive shaft 9 and thus also with respect to the agitator shaft 18 non-rotatable.

An dem außerhalb der Rührwerkswelle 18 und außerhalb der Antriebswelle 9 liegenden Ende der Schiebehülse 47 ist an dieser eine Rohrkupplung 48 mittels eines Lagers 49 drehbar und mittels einer Dichtung 50 abgedichtet befestigt. Diese Rohrkupplung 48 kann also stationär festgehalten werden, wenn Antriebswelle 9 und Rührwerkswelle 18 drehend angetrieben werden.On the outside of the agitator shaft 18 and outside of the drive shaft 9 lying end of the sliding sleeve 47 there is a pipe coupling 48 rotatable by means of a bearing 49 and sealed by means of a seal 50 attached. This pipe coupling 48 can therefore be held stationary, when drive shaft 9 and agitator shaft 18 are driven in rotation.

Die Rohrkupplung 48 ist mit einem Schlauchanschluß 51 versehen, in den ein Schlauch einschraubbar ist, durch den zum Reinigen Druckgas oder Spülflüssigkeit unter Druck zugeführt werden kann.The pipe coupling 48 is provided with a hose connection 51, in the a hose can be screwed in through which compressed gas or for cleaning Flushing liquid can be supplied under pressure.

Die Schiebehülse 47 erstreckt sich über die Verbindung 52 zwischen der Antriebswelle 9 und der Rührwerkswelle 18 hinaus, wobei an diesem Ende der Schiebehülse 47 ein ringförmiger Verschlußkolben 53 angebracht ist. Der Verschlußkolben 53 liegt gegen die Innenwand 54 des Rückführkanals 25 abdichtend an. Hierzu besteht er aus einem geeigneten Material, beispielsweise aus PTFE oder dergleichen. Die Länge b des Verschlußkolbens 53 in Richtung der Achse 17 ist zumindest etwas größer als der Durchmesser c der Einlaßkanäle 26 bzw. deren Erstreckung in Richtung der Achse 17, so daß mit dem Verschlußkolben 53 die Einlaßkanäle 26 verschlossen werden können, wie in Fig. 3 unten dargestellt ist. Die Schiebehülse 47 ist wiederum um einen Verschiebeweg d zwischen ihren beiden in Fig. 3 oben bzw. unten dargestellten Endlagen verschiebbar, der so groß ist, daß in der einen - in Fig. 3 oben dargestellten - Endlage der Verschlußkolben 53 die Einlaßkanäle 26 nicht abdeckt. In dieser Endlage befindet sich der Verschlußkolben 53 zwischen dem benachbarten Ende der Antriebswelle 9 und den Einlaßkanälen 26. In der anderen - in Fig. 3 unten dargestellten - Endlage, in der die Schiebehülse 47 in den Rückführkanal 25 der Rührwerkswelle 18 eingeschoben ist, deckt der ringförmige Verschlußkolben 53 die Einlaßkanäle 26 ab.The sliding sleeve 47 extends over the connection 52 between the Drive shaft 9 and the agitator shaft 18, at this end the sliding sleeve 47, an annular locking piston 53 is attached. The sealing piston 53 lies against the inner wall 54 of the return duct 25 sealing. For this purpose it consists of a suitable material, for example made of PTFE or the like. The length b of the sealing piston 53 in the direction of the axis 17 is at least somewhat larger than the diameter c of the inlet channels 26 or their extension in the direction of the axis 17, so that the inlet channels 26 are closed with the sealing piston 53 can be, as shown in Fig. 3 below. The sliding sleeve 47 is again a displacement d between their two in FIG. 3 End positions shown above or below, which is so large that in one end position - shown in Fig. 3 - the locking piston 53 does not cover the inlet channels 26. Is in this end position the locking piston 53 between the adjacent end of the drive shaft 9 and the inlet channels 26. In the other - in Fig. 3 below shown - end position in which the sliding sleeve 47 in the return channel 25 of the agitator shaft 18 is inserted, the annular covers Locking piston 53 from the inlet channels 26.

Wenn in der in Fig. 3 unten dargestellten Stellung, in der die Einlaßkanäle 26 durch den Verschlußkolben 53 verschlossen sind, Druckgas oder Spülflüssigkeit unter Druck als Reinigungsmittel durch die Rohrkupplung 48 und die Schiebehülse 47 in den Rückführkanal 25 eingeführt wird, dann fließt dies ausschließlich durch den Rückführkanal 25 und reinigt diesen von Mahlhilfskörpern 40 und Mahlgut. Außerdem wird selbstverständlich auch der Innenraum 28 des käfigartigen Abschnitts 27 und die Mahlhilfskörper-Rückhalteeinrichtung 35 gereinigt. Außerdem erfolgt gegebenenfalls zum Teil eine Reinigung des Mahlgut-Einlaßraumes 32. Eine Dichtung 55 zwischen der Antriebswelle 9 und der Schiebehülse 47 verhindert, daß Druckgas oder Spülflüssigkeit unter Druck zwischen der Antriebswelle 9 und der Schiebehülse 47 nach außen austreten können.When in the position shown in Fig. 3 below, in which the inlet channels 26 are closed by the sealing piston 53, compressed gas or Flushing liquid under pressure as a cleaning agent through the pipe coupling 48 and the sliding sleeve 47 is inserted into the return duct 25, then this flows exclusively through the return duct 25 and cleans this of grinding auxiliary bodies 40 and regrind. It also goes without saying also the interior 28 of the cage-like section 27 and the Grinder auxiliary body retainer 35 cleaned. In addition, if necessary partly cleaning the regrind inlet space 32. A Prevents seal 55 between the drive shaft 9 and the sliding sleeve 47, that pressurized gas or flushing liquid under pressure between the drive shaft 9 and the sliding sleeve 47 can exit to the outside.

Wenn dagegen die Schiebehülse 47 weitestmöglich aus der Antriebswelle 9 herausgezogen ist, dann befindet sich der Verschlußkolben 53 in der in Fig. 3 oben dargestellten Stellung. Wenn jetzt Druckgas oder Spülflüssigkeit unter Druck zugeführt wird, dann fließt ein Teil hiervon durch den Rückführkanal 25 und führt die bereits geschilderten Reinigungsvorgänge aus. Ein weiterer Teil dieses Reinigungsittels fließt durch die Einlaßkanäle 26 und reinigt diese und fließt dann weiter durch den gesamten Mahlraum 16, wobei dieser und die dort befindlichen Mahlhilfskörper 40 gereinigt werden. Bei beiden geschilderten Reinigungsvorgängen wird die Rührwerkswelle 18 angetrieben.On the other hand, if the sliding sleeve 47 as far as possible from the drive shaft 9 is pulled out, then the locking piston 53 is in the Fig. 3 position shown above. If now pressurized gas or flushing liquid is supplied under pressure, then a part of it flows through the Return channel 25 and performs the cleaning processes already described out. Another part of this cleaning agent flows through the inlet channels 26 and cleans it and then continues to flow through the whole Grinding chamber 16, this and the auxiliary grinding bodies 40 located there getting cleaned. In both of the cleaning processes described, the Agitator shaft 18 driven.

Claims (10)

  1. An agitator mill, comprising
    a grinding receptacle (12), of which a cylindrical wall (13) and a first end wall (14) in the form of a lid and a second end wall (15) in the form of a bottom define a grinding chamber (16);
    an agitator unit disposed in the grinding receptacle (12) and having an agitator shaft (18), which is cantilevered outside the grinding chamber (16) and finished by a free end inside the grinding chamber (16), and agitator elements (20) attached to the agitator shaft (18);
    a drive motor (5) for the high-speed actuation of the agitator unit;
    a cage-type section (27), which is attached to the flee end of the agitator shaft (18) in vicinity to the second end wall (15) and defines an inner chamber (28);
    an annular cylindrical grinding-stock inlet chamber (32) between the cage-type section (27) defining an inner chamber (28), and the wall (13) of the grinding receptacle (12);
    a grinding-stock inlet (24) disposed at least in vicinity to the second end wall (15) of the grinding receptacle (12) and opening into the annular cylindrical grinding-stock inlet chamber (32);
    an auxiliary-grinding-body retaining device (35) disposed in the inner chamber (28) of the cage-type section (27);
    a grinding-stock outlet (37) contiguous to the auxiliary-grinding-body retaining device (35) and passing through the second end wall (15);
    a grinding-stock/auxiliary-grinding-body return chamber (25), which is formed in the agitator shaft (18), and which, in vicinity to the first end wall (14) of the grinding receptacle (12), is connected with the grinding chamber (16) via at least one inlet passage (26) in the agitator shaft (18), and which opens via a junction (38) into the inner chamber (28) of the cage-type section (27);
    passages (31) formed in the cage-type section (27) and connecting the inner chamber (28) with the grinding-stock inlet chamber (32).
  2. An agitator mill according to claim 1, wherein the auxiliary-grinding-body retaining device (35) is a filter cylinder (36) projecting into the inner chamber (28).
  3. An agitator mill according to claim 1, wherein between the junction (38) of the return chamber (25) passing into the inner chamber (28) and the auxiliary-grinding-body retaining device (35), a deflector is attached to the cage-type section (27).
  4. An agitator mill according to claim 3, wherein the deflector is a deflector disk (39).
  5. An agitator mill according to claim 3 or 4, wherein the deflector overlaps the auxiliary-grinding-body retaining device (35).
  6. An agitator mill according to claim 1, wherein the cage-type section (27) extends as far as into the close vicinity of the second end wall of the grinding receptacle (12).
  7. An agitator mill according to claim 1, wherein the agitator shaft (18) is provided with a device (46) for cleaning the return chamber (25).
  8. An agitator mill according to claim 7, wherein the device (46) comprises a pipe coupling (48) disposed outside of the grinding receptacle (12).
  9. An agitator mill according to claim 7 or 8, wherein the device (46) comprises a closing piston (53), which is disposed in the return chamber (25) and which is displaceable between an end position in which the at least one inlet passage (26) is released, and an end position in which the inlet passage (26) is closed.
  10. An agitator mill according to claim 9, wherein the closing piston (53) is attached to one end of a sliding sleeve (47), to the other end of which the pipe coupling (48) is fastened.
EP95113212A 1994-09-09 1995-08-23 Agitator mill Expired - Lifetime EP0700723B1 (en)

Applications Claiming Priority (2)

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DE4432203 1994-09-09
DE4432203A DE4432203A1 (en) 1994-09-09 1994-09-09 Agitator mill

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EP0700723B1 true EP0700723B1 (en) 1999-04-21

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JP (1) JP3600324B2 (en)
CN (1) CN1040511C (en)
AT (1) ATE179094T1 (en)
AU (1) AU684985B2 (en)
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CA (1) CA2157702A1 (en)
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Cited By (3)

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Publication number Priority date Publication date Assignee Title
DE102014105149A1 (en) 2014-04-11 2015-10-15 Netzsch-Feinmahltechnik Gmbh Shaft bushing
WO2015154742A1 (en) 2014-04-11 2015-10-15 Netzsch-Feinmahltechnik Gmbh Shaft feed-through
DE102014105149B4 (en) * 2014-04-11 2018-01-25 Netzsch-Feinmahltechnik Gmbh Shaft bushing

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CA2157702A1 (en) 1996-03-10
DE4432203A1 (en) 1996-03-14
ZA957581B (en) 1996-04-15
DE59505693D1 (en) 1999-05-27
US5566896A (en) 1996-10-22
ES2130483T3 (en) 1999-07-01
CN1119557A (en) 1996-04-03
JPH0899045A (en) 1996-04-16
ATE179094T1 (en) 1999-05-15
CN1040511C (en) 1998-11-04
EP0700723A1 (en) 1996-03-13
AU684985B2 (en) 1998-01-08
JP3600324B2 (en) 2004-12-15
AU3051495A (en) 1996-03-21
RU2138334C1 (en) 1999-09-27
BR9503978A (en) 1996-09-24

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