EP0038794A2 - Grinding plant - Google Patents

Grinding plant Download PDF

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Publication number
EP0038794A2
EP0038794A2 EP81890069A EP81890069A EP0038794A2 EP 0038794 A2 EP0038794 A2 EP 0038794A2 EP 81890069 A EP81890069 A EP 81890069A EP 81890069 A EP81890069 A EP 81890069A EP 0038794 A2 EP0038794 A2 EP 0038794A2
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EP
European Patent Office
Prior art keywords
discharge chamber
grinding drum
grinding
discharge
discharge opening
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.)
Granted
Application number
EP81890069A
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German (de)
French (fr)
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EP0038794B1 (en
EP0038794A3 (en
Inventor
Gerhard Frenzel
Franz Scheucher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Austroplan Osterreichische Planungsgesellschaft Mbh
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Austroplan Osterreichische Planungsgesellschaft Mbh
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Publication of EP0038794A2 publication Critical patent/EP0038794A2/en
Publication of EP0038794A3 publication Critical patent/EP0038794A3/en
Application granted granted Critical
Publication of EP0038794B1 publication Critical patent/EP0038794B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the 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
    • B02C17/04—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 with unperforated container
    • 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
    • B02C17/18—Details

Definitions

  • the invention relates to a grinding system with a rotating, lying arranged grinding drum, at one end of which there is an axial inlet opening and at the other end of which an axial discharge opening is provided, the grinding system being a conveying device which conveys the material to be ground from the discharge opening of the grinding drum to a level above the discharge opening having.
  • the ground material emerges from the grinding drum around the radius of the discharge opening below the central axis of the grinding drum, which makes it difficult to convey the ground material further to other downstream machines downstream of the grinding drum.
  • the regrind is to be conveyed from the discharge opening, for example to a wind sifter, in a grinding system with a closed circuit, the regrind has to be conveyed from the discharge opening of the grinding drum to the intake opening of the wind sifter by means of a bucket elevator.
  • a bucket elevator is not only energy-intensive - the regrind is moved vertically over a very long conveyor length - but also requires a hall of a specific design with a foundation pit and with at least one floor above the grinding drum. Ahlstrom for maintenance and repairs to such M are needed on each floor own mounting alskräne l, the construction and investment costs so that when this system is very large.
  • the invention aims at avoiding these disadvantages and difficulties and has as its object to provide an M ahlstrom of the initially described type to create, in which it is possible the grinding drum downstream of downstream equipment smaller on .
  • Participants level as the grinding drum and together with the grinding drum on as Arrange the base area and thus enable minimal conveying path lengths for the regrind.
  • the discharge opening opens into a discharge chamber which rotates about an approximately horizontal axis and has a rotationally symmetrical design, the jacket parts of which convey the ground material extend from a level below to a level above the discharge opening and the discharge chamber above the discharge opening is a removal device for the regrind.
  • the discharge chamber By this discharge chamber, the discharge of the ground material is allowed above the discharge of the grinding drum, so that the ground material, without a loading c herwerk to need, can be conveyed to the downstream of the grinding drum downstream machines.
  • the grinding system according to the invention therefore makes it possible to set up a sifter arranged downstream of the grinding drum directly next to the grinding drum and at the same level as this, so that it can be found with a hall with a small footprint and without a floor above a hallway. Furthermore, the entire system can be easily maintained using a single overhead traveling crane, which reduces investment costs and significantly reduces repair times.
  • the classifier immediately bar next to the grinding drum there is a very short conveying path length between the grinding drum and classifier, which also reduces the energy requirement compared to conventional grinding systems.
  • the discharge chamber is preferably arranged coaxially with the grinding drum, is overhung on the grinding drum and is fixed to it in a rotationally fixed manner.
  • the discharge chamber has a larger, preferably at least more than 1.75 times larger diameter than the grinding drum.
  • Grinding drums are operated at a speed at which the centrifugal force acting on the ground material or the grinding elements provided inside the drum is lower in the upper region of the drum than the radially directed component of the gravity of the grinding material or the grinding elements.
  • the grinding media and regrind particles located in the grinding drum detach from the drum wall and, after being conveyed upwards by the drum, fall down.
  • the diameter of the discharge chamber is larger than that of the grinding drum, then (ßb a certain diameter), the larger centrifugal force caused by the larger radius causes the material to be grounded against the lateral surfaces of the discharge chamber also above the axis of rotation, i.e. that the regrind is conveyed with certainty to the highest point of the discharge chamber, without special installations in the discharge chamber being required.
  • a stationary scraper protrudes from the front of the discharge chamber into the interior of the discharge chamber in its part located above the discharge opening, with scraper edges of the scraper are arranged at a short distance from the jacket parts of the discharge chamber which convey the regrind.
  • An expedient embodiment of the system is characterized in that the end face of the discharge chamber is provided with a cover which is arranged in a stationary manner and is sealed off from the rotating discharge chamber and has a discharge opening for the regrind, and that the scraper is fastened to the cover at the discharge opening.
  • the discharge chamber has a smaller diameter than is required for conveyance by means of centrifugal force, it is cup-shaped in the discharge chamber at the lateral surfaces thereof, ending at a distance from the discharge opening Arrange blades and let a continuous conveyor protrude into the interior of the discharge chamber for the removal of the material conveyed by the blades.
  • FIGS. 1 and 2 in a schematic representation of a grinding plant with a closed circuit of conventional design in side and end view together with the hall shown in section
  • FIGS. 3 and 4 a grinding plant according to the invention also in side view. and show front view of the hall shown in cross-section.
  • Fig. 5 illustrates the discharge chamber in section along the line V-V of Fig. 4.
  • Fig. 6 shows the material flow within the discharge chamber. 7 shows another embodiment of the discharge chamber.
  • the material to be ground (raw material) is conveyed via a conveyor belt 1 to a feed lock 2, from which the raw material flows through an axial inlet opening 3 into the cylindrical grinding drum 4.
  • the grinding drum 4 is rotatably mounted with respect to the foundation 7 by means of two hollow end journals, also called neck bearings 5, 6, formed with a smaller radius than the grinding drum, and by means of a pinion 10 driven by an electric motor 8 via a gear 9, which in a on the jacket the grinding drum 4 engages peripherally arranged ring gear 11, driven.
  • the ground goods are left after leaving the grinding drum 4 is passed through an axial discharge opening 12 via an air conveyor trough 13 to a vertical conveyor 14 which is designed as a bucket elevator.
  • This bucket elevator 14 is set up in a foundation pit 15 and conveys the ground material to a floor 16 above the grinding drum 4. From this bucket elevator 14, the ground material is fed to an air classifier 17, from which, after separation of the ground material into coarse and fine material (finished product ) the coarse material is in turn fed to the feed lock 2 by means of a conveyor device 18, whereas the fine material leaves the grinding system by means of a continuous conveyor 19.
  • the classifier could also be a cyclone air classifier.
  • a grinding plant according to the invention is shown.
  • the grinding drum and its drive are designed essentially the same as in the known system.
  • the discharge opening in the system according to the invention opens into a discharge chamber 20 which is arranged coaxially with the grinding drum 4 and is rotatably connected to it and therefore rotates together.
  • the discharge chamber is designed to be rotationally symmetrical and has a conically widening inlet part 21, an adjoining jacket 22 which extends in the radial direction and a cylindrical jacket 23 extending from the circumference of this jacket, which at its outer end, ie on the end face 24 of the discharge chamber, has an annular, radially, inwardly extending board 25 is provided.
  • the discharge chamber 20 is provided with a stationary cover 27 which is mounted on a stationary frame 26 and which has a central opening 28 for the removal of air or other gases (vapors) which is (are) sucked off via a line 29.
  • the stationary cover has a cylindrical rim 30, which is opposite the radially inward rim 25 of the discharge chamber by means of a seal, not shown, for example a laby Rinth seal is largely sealed against sucked-in false air.
  • the stationary cover 27 Above the discharge opening 12 of the grinding drum 4, the stationary cover 27 has a discharge opening 31 for the ground material. Laterally next to the discharge opening 31, a scraper 32 is mounted on the stationary cover 27, which has scraper edges 33 which are at a short distance 34 from the radial and cylindrical jacket 22, 23.
  • An air conveyor trough 35 is connected to the discharge opening 31, in which the ground material arrives at a diaphragm 36.
  • a channel 37 is provided below the diaphragm for the supply of compressed air.
  • the ground material itself is fed in the conveying channel 38 arranged above the diaphragm by means of the compressed air passing through the diaphragm to a wind sifter 17 arranged directly next to the grinding drum 4, ie at approximately the same level.
  • the ground material is sifted into coarse and finished material.
  • the coarse material in turn is conveyed to the feed lock 2 of the grinding drum 4 by means of a conveyor device 39, which is preferably designed as a conveyor belt.
  • all system parts are arranged on the hallway 41 and can be operated by means of a single overhead traveling crane 42 in the event of a repair, etc.
  • the length 43 and width 44 of the hall corresponds approximately to the length 43 and width 44 of a hall of a known system having the same power, as is shown in FIGS. 1 and 2.
  • the function of the discharge chamber 20 is as follows: the grinding drum 4 rotates at a subcritical speed n, ie the grinding material is accelerated when the mill rotates due to friction on the grinding drum and is carried up by the centrifugal force on the drum casing. Once the radially directed component of gravity is larger than the centri force, the grinding media and regrind particles loosen from the drum wall and fall down again.
  • the diameter D of the discharge chamber 20 is designed according to the invention such that the centrifugal force acting on the cylindrical jacket 23 of the discharge chamber 20 is always greater than the radially directed component of gravity, as a result of which the ground material emerging through the discharge opening 12 from the grinding drum 4 initially due to the effect of gravity reaches the peripheral jacket parts 22, 23, 25 of the discharge chamber 20 and then adheres to them as a result of the centrifugal force until it is raised to the stripper 32 provided above the discharge opening., The stripper 32 detaches the ground material from the jacket parts 22, 23, 25 of the discharge chamber 20, after which the regrind is conveyed through the discharge opening 31 to the air conveyor trough 35.
  • the minimum diameter D min for the discharge chamber can be calculated from the critical speed n crit ' at which the material adheres to the cylindrical surface and the diameter d of the grinding drum as follows:
  • the speed n of a mill is calculated according to the formula and the critical speed n crit is estimated from the formula calculated.
  • Another advantage of the system according to the invention is that the discharge chamber 20, which has a larger diameter D than the discharge opening 12, greatly reduces the flow velocity of the gases emerging from the discharge opening 12. As a result, easy separation of the dust-like ground material from the vapors and thus relief of the dedusting units is granted.
  • FIG. 7 shows a variant 46 of the discharge chamber according to the invention, in which the diameter is selected so that the material does not adhere to the cylindrical lateral surface due to the centrifugal force.
  • the regrind is conveyed up here by means of cup-shaped blades 47, which are fastened to the cylindrical or radial lateral surface, and slips from the blades as soon as they have reached their uppermost position, onto an air conveyor trough projecting into the interior of the discharge chamber 46 through a discharge opening 48, the ATE M rial similar to the embodiment shown in FIGS. 3 and 4 promotes plant to an air classifier.
  • the diameter of the discharge chamber 46 can be kept as small as possible (also smaller than the diameter d of the grinding drum); the minimum diameter is only determined by the necessary delivery head that the regrind has to travel from the discharge opening to the air classifier. For this reason, this embodiment is particularly suitable for slow-running grinding drums with large diameters.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

1. A grinding plant comprising a rotating horizontally arranged grinding drum (4) on whose one end an axial entrance opening (3) and on whose other end an axial delivery opening (12) are provided, characterised in that the delivery opening (12) runs into a rotating rotationally symmetrically designed delivery chamber (20, 46) arranged coaxially with the grinding drum (4), whose shell parts (22, 23, 25) conveying the grinding stock extend from a level below the delivery opening as far as to such a high level above the delivery opening (12) that it can be conveyed to subsequently arranged follow-on machines (17) without the help of an additional upwards conveyor, and that the delivery chamber (20, 46) comprises a pick-up means (31, 32, 35) for the grinding stock above the delivery opening (12).

Description

Die Erfindung betrifft eine Mahlanlage mit einer rotierenden, liegend angeordneten Mahltrommel, an deren einem Ende eine axiale Eintrittsöffnung und an deren anderem Ende eine axiale Austragsöffnung vorgesehen sind, wobei die Mahlanlage eine das Mahlgut von der Austragsöffnung der Mahltrommel auf ein Niveau oberhalb der Austragsöffnung fördernde Fördereinrichtung aufweist.The invention relates to a grinding system with a rotating, lying arranged grinding drum, at one end of which there is an axial inlet opening and at the other end of which an axial discharge opening is provided, the grinding system being a conveying device which conveys the material to be ground from the discharge opening of the grinding drum to a level above the discharge opening having.

Bei Verwendung von liegend angeordneten Mahltrommeln mit axialer Austragsöffnung tritt das Mahlgut um den Radius der Austragsöffnung unterhalb der Mittelachse der Mahltrommel aus der Mahltrommel aus, wodurch es mit Schwierigkeiten verbunden ist, das Mahlgut mittels einer Fördereinrichtung zu anderen, der Mahltrommel nachgeordneten Folgemaschinen weiterzufördern. Soll das Mahlgut bei einer Mahlanlage mit geschlossenem Kreislauf von der Austragsöffnung beispielsweise zu einem Windsichter gefördert werden, muß man das Mahlgut mittels eines Becherwerkes von der Austragsöffnung der Mahltrommel zur Aufnahmeöffnung des Windsichters fördern. Ein solches Becherwerk ist nicht nur energieaufwendig - das Mahlgut wird über eine sehr große Förderlänge vertikal bewegt - , sondern benötigt auch eine Halle spezifischer Bauart mit einer Fundamentgrube und mit mindestens einem oberhalb der Mahltrommel angeordneten Geschoß. Zur Wartung und für Reparaturen an einer solchen Mahlanlage benötigt man in jedem Geschoß eigene Montage- laufkräne, sodaß der Bau- und Investitionsaufwand bei dieser Anlage sehr groß ist.When using horizontally arranged grinding drums with an axial discharge opening, the ground material emerges from the grinding drum around the radius of the discharge opening below the central axis of the grinding drum, which makes it difficult to convey the ground material further to other downstream machines downstream of the grinding drum. If the regrind is to be conveyed from the discharge opening, for example to a wind sifter, in a grinding system with a closed circuit, the regrind has to be conveyed from the discharge opening of the grinding drum to the intake opening of the wind sifter by means of a bucket elevator. Such a bucket elevator is not only energy-intensive - the regrind is moved vertically over a very long conveyor length - but also requires a hall of a specific design with a foundation pit and with at least one floor above the grinding drum. Ahlanlage for maintenance and repairs to such M are needed on each floor own mounting aufkräne l, the construction and investment costs so that when this system is very large.

Die Erfindung bezweckt die Vermeidung dieser Nachteile und Schwierigkeiten und stellt sich die Aufgabe, eine Mahlanlage der eingangs beschriebenen Art zu schaffen, bei der es möglich ist, der Mahltrommel nachgeordnete Folgemaschinen auf .gleicher Ebene wie die Mahltrommel und zusammen mit der Mahltrommel auf möglichst kleiner Grundfläche anzuordnen und so minimale Förderweglängen für das Mahlgut zu ermöglichen.The invention aims at avoiding these disadvantages and difficulties and has as its object to provide an M ahlanlage of the initially described type to create, in which it is possible the grinding drum downstream of downstream equipment smaller on .gleicher level as the grinding drum and together with the grinding drum on as Arrange the base area and thus enable minimal conveying path lengths for the regrind.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Austragsöffnung in eine um eine etwa horizontale Achse rotierende, rotationssymmetrisch ausgebildete Austragskammer mündet, deren das Mahlgut fördernde Mantelteile sich von einem Niveau unterhalb bis zu einem Niveau oberhalb der Austragsöffnung erstrecken und die Austragskammer oberhalb der Austragsöffnung eine Abnahmeeinrichtung für das Mahlgut besitzt. Durch diese Austragskammer wird die Abgabe des Mahlgutes oberhalb der Austragsöffnung der Mahltrommel ermöglicht, sodaß das Mahlgut, ohne ein Be- cherwerk zu benötigen, zu den der Mahltrommel nachgeordneten Folgemaschinen gefördert werden kann. Durch die erfindungsgemäße Mahlanlage ist es daher möglich, einen der Mahltrommel nachgeordneten Sichter unmittelbar neben der Mahltrommel und auf gleichem Niveau wie diese aufzustellen, sodaß mit einer Halle mit kleiner Grundfläche und ohne Geschoß über Flur das Auslangen gefunden werden kann. Weiters kann die gesamte Anlage mittels eines einzigen Montagelaufkranes leicht gewartet werden, wodurch der Investitionsaufwand reduziert und Reparaturzeiten erheblich verkürzt werden. Durch die Anordnung des Sichters unmittelbar neben der Mahltrommel ergibt sich eine sehr kurze Förderweglänge zwischen Mahltrommel und Sichter, wodurch auch der Energiebedarf gegenüber herkömmlichen Mahlanlagen reduziert ist.This object is achieved in that the discharge opening opens into a discharge chamber which rotates about an approximately horizontal axis and has a rotationally symmetrical design, the jacket parts of which convey the ground material extend from a level below to a level above the discharge opening and the discharge chamber above the discharge opening is a removal device for the regrind. By this discharge chamber, the discharge of the ground material is allowed above the discharge of the grinding drum, so that the ground material, without a loading c herwerk to need, can be conveyed to the downstream of the grinding drum downstream machines. The grinding system according to the invention therefore makes it possible to set up a sifter arranged downstream of the grinding drum directly next to the grinding drum and at the same level as this, so that it can be found with a hall with a small footprint and without a floor above a hallway. Furthermore, the entire system can be easily maintained using a single overhead traveling crane, which reduces investment costs and significantly reduces repair times. By arranging the classifier immediately bar next to the grinding drum, there is a very short conveying path length between the grinding drum and classifier, which also reduces the energy requirement compared to conventional grinding systems.

Vorzugsweise ist die Austragskammer koaxial zur Mahltrommel angeordnet, an der Mahltrommel fliegend gelagert und an dieser drehfest befestigt. Durch diese Ausgestaltungen läßt sich die Anlage noch kompakter bauen und man benötigt für die Austragskammer keinen eigenen Antrieb.The discharge chamber is preferably arranged coaxially with the grinding drum, is overhung on the grinding drum and is fixed to it in a rotationally fixed manner. With these designs, the system can be built even more compactly and no separate drive is required for the discharge chamber.

Nach einer bevorzugten Ausführungsform weist.die Austragskammer einen größeren, vorzugsweise einen um mindestens mehr als 1,75-fach größeren Durchmesser auf als die Mahltrommel. Mahltrommeln werden mit einer Drehzahl betrieben, bei der die auf das Mahlgut bzw. die im Inneren der Trommel vorgesehenen Mahlkörper wirkende Zentrifugalkraft im oberen Bereich der Trommel kleiner ist als die radial gerichtete Komponente der Schwerkraft des Mahlgutes bzw. der Mahlkörper. Dadurch lösen sich die in der Mahltrommel befindlichen Mahlkörper und Mahlgutteilchen von der Trommelwand und fallen, nachdem sie von der Trommel ein Stück hochgefördert sind, nach unten. Ist der Durchmesser der Austragskammer größer als der der Mahltrommel, so bewirkt ßb einem bestimmten Durchmesser) die durch den größeren Radius bedingte größere Fliehkraft ein Anliegen des Mahlgutes an den Mantelflächen der Austragskammer auch oberhalb der Drehachse, d.h. daß das Mahlgut mit Sicherheit bis zum höchsten Punkt der Austragskammer gefördert wird, ohne daß besondere Einbauten in der Austragskammer erforderlich sind.According to a preferred embodiment, the discharge chamber has a larger, preferably at least more than 1.75 times larger diameter than the grinding drum. Grinding drums are operated at a speed at which the centrifugal force acting on the ground material or the grinding elements provided inside the drum is lower in the upper region of the drum than the radially directed component of the gravity of the grinding material or the grinding elements. As a result, the grinding media and regrind particles located in the grinding drum detach from the drum wall and, after being conveyed upwards by the drum, fall down. If the diameter of the discharge chamber is larger than that of the grinding drum, then (ßb a certain diameter), the larger centrifugal force caused by the larger radius causes the material to be grounded against the lateral surfaces of the discharge chamber also above the axis of rotation, i.e. that the regrind is conveyed with certainty to the highest point of the discharge chamber, without special installations in the discharge chamber being required.

Zweckmäßig ragt dabei ein ortsfest angeordneter Abstreifer von der Stirnseite der Austragskammer her in das Innere der Austragskammer in deren oberhalb der Austragsöffnung befindlichen Teil, wobei Abstreifkanten des Abstreifers in geringem Abstand von den das Mahlgut fördernden Mantelteilen der Austragskammer angeordnet sind.Appropriately, a stationary scraper protrudes from the front of the discharge chamber into the interior of the discharge chamber in its part located above the discharge opening, with scraper edges of the scraper are arranged at a short distance from the jacket parts of the discharge chamber which convey the regrind.

Eine zweckmäßige Ausgestaltung der Anlage ist dadurch gekennzeichnet, daß die Stirnseite der Austragskammer mit einer stationär angeordneten, gegenüber der rotierenden Austragskammer abgedichteten Abdeckung versehen ist, die eine Abgabeöffnung für das Mahlgut aufweist, und daß der Abstreifer an der Abdeckung bei der Abgabeöffnung befestigt ist.An expedient embodiment of the system is characterized in that the end face of the discharge chamber is provided with a cover which is arranged in a stationary manner and is sealed off from the rotating discharge chamber and has a discharge opening for the regrind, and that the scraper is fastened to the cover at the discharge opening.

Es ist jedoch auch möglich, das Mahlgut in der Austragskammer nicht mit Hilfe der Fliehkraft hochzufördern, sondern, wenn die Austragskammer einen kleineren Durchmesser aufweist als zum Fördern mittels Fliehkraft erforderlich ist, in der Austragskammer an den Mantelflächen derselben becherförmige, im Abstand von der Austragsöffnung endende Schaufeln anzuordnen und einen Stetigförderer bis in das Innere der Austragskammer zur Abnahme des von den Schaufeln geförderten Gutes ragen zu lassen.However, it is also possible not to convey the regrind in the discharge chamber with the aid of centrifugal force, but if the discharge chamber has a smaller diameter than is required for conveyance by means of centrifugal force, it is cup-shaped in the discharge chamber at the lateral surfaces thereof, ending at a distance from the discharge opening Arrange blades and let a continuous conveyor protrude into the interior of the discharge chamber for the removal of the material conveyed by the blades.

Eine bevorzugte optimale Ausführungsform einer Mahlanlage mit einem geschlossenen Kreislauf ist durch die Kombination folgender Merkmale gekennzeichnet:

  • - daß eine liegend angeordnete, rotierende Mahltrommel mit einer axialen Eintritts- und einer axialen Austragsöffnung vorgesehen ist,
  • - daß die Austragsöffnung in eine koaxial zur Mahltrommel angeordnete und an der Mahltrommel drehfest montierte Austragskammer mündet,
  • - daß die Austragskammer einen größeren Durchmesser aufweist als die Mahltrommel, wobei sich der Mantel der Mahltrommel mit unterkritischer und der Mantel der Austragskammer mit überkritischer Umfangsgeschwindigkeit, jedoch mit selber Drehzahl bewegen,
  • - daß die Austragskammer oberhalb der Austragsöffnung eine Abnahmeeinrichtung für das Mahlgut besitzt,
  • - daß von der Abnahmeeinrichtung eine das Mahlgut fördernde Fördereinrichtung zu einem Sichter führt,
  • - daß der Sichter unmittelbar neben der Mahltrommel und in etwa gleicher Höhenlage wie die Mahltrommel und mit dieser auf einer gemeinsamen Etage, insbesondere auf dem Hallenflur angeordnet ist, und
  • - daß vom Sichter eine das Grobgut zur Eintrittsöffnung fördernde Fördereinrichtung vorgesehen ist.
A preferred optimal embodiment of a grinding plant with a closed circuit is characterized by the combination of the following features:
  • that a lying, rotating grinding drum with an axial inlet opening and an axial discharge opening is provided,
  • that the discharge opening opens into a discharge chamber which is arranged coaxially with the grinding drum and is mounted on the grinding drum in a rotationally fixed manner,
  • that the discharge chamber has a larger diameter than the grinding drum, the jacket of the grinding drum moving with subcritical and the jacket of the discharge chamber with supercritical peripheral speed, but at the same speed,
  • - That the discharge chamber above the discharge opening Has a removal device for the regrind,
  • that a conveying device conveying the regrind leads from the removal device to a classifier,
  • - That the classifier is located directly next to the grinding drum and at approximately the same height as the grinding drum and with it on a common floor, in particular on the hallway, and
  • - That the sifter provides a coarse material conveying device to the inlet opening.

Die Erfindung ist nachstehend anhand der Zeichnung näher erläutert, wobei die Fig. 1 und 2 in schematischer Darstellung eine Mahlanlage mit geschlossenem Kreislauf herkömmlicher Bauart in Seiten- und Stirnansicht samt geschnitten dargestellter Halle und die Fig. 3 und 4 eine erfindungsgemäße Mahlanlage ebenfalls in Seiten- und Stirnansicht mitgeschnitten dargestellter Halle zeigen. Fig. 5 veranschaulicht die Austragskammer im Schnitt längs der Linie V-V der Fig. 4. Fig. 6 zeigt den Materialfluß innerhalb der Austragskammer. In Fig. 7 ist eine weitere Ausführungsform der Austragskammer dargestellt.The invention is explained in more detail below with reference to the drawing, with FIGS. 1 and 2 in a schematic representation of a grinding plant with a closed circuit of conventional design in side and end view together with the hall shown in section, and FIGS. 3 and 4 a grinding plant according to the invention also in side view. and show front view of the hall shown in cross-section. Fig. 5 illustrates the discharge chamber in section along the line V-V of Fig. 4. Fig. 6 shows the material flow within the discharge chamber. 7 shows another embodiment of the discharge chamber.

Bei der in den Fig. 1 und 2 dargestellten Mahlanlage bekannter Bauart gelangt das zu mahlende Gut (Rohmaterial) über ein Förderband 1 zu einer Aufgabeschleuse 2, von der aus das Rohmaterial durch eine axiale Eintrittsöffnung 3 in die zylindrisch ausgebildete Mahltrommel 4 fließt. Die Mahltrommel 4 ist mittels zweier, mit kleinerem Radius als die Mahltrommel ausgebildeter hohler Endzapfen, auch Halslager 5, 6 genannt, gegenüber dem Fundament 7 drehbar gelagert und mittels eines von einem Elektromotor 8 über ein Getriebe 9 angetriebenes Ritzel 10, das in einen am Mantel der Mahltrommel 4 peripher angeordneten Zahnkranz 11 eingreift, antreibbar. Das gemahlene Gut wird nach Verlassen der Mahltrommel 4 durch eine axiale Austragsöffnung 12 über eine Luftförderrinne 13 zu einem Senkrechtförderer 14 geleitet, der als Becherwerk ausgebildet ist. Dieses Becherwerk 14 ist in einer Fundamentgrube 15 aufgestellt und fördert das gemahlene Gut in eine Etage 16 oberhalb der Mahltrommel 4. Von diesem Becherwerk 14 wird das gemahlene Gut einem Windsichter 17 zugeführt, von dem nach Trennung des gemahlenen Gutes in Grob- und Feingut (Fertiggut) das Grobgut mittels einer Fördereinrichtung 18 wiederum der Aufgabeschleuse 2 zugeführt wird, wogegen das Feingut mittels eines Stetigförderers 19 die Mahlanlage verläßt. Der Sichter könnte auch ein Zyklonumluftsichter sein.In the grinding system of known type shown in FIGS. 1 and 2, the material to be ground (raw material) is conveyed via a conveyor belt 1 to a feed lock 2, from which the raw material flows through an axial inlet opening 3 into the cylindrical grinding drum 4. The grinding drum 4 is rotatably mounted with respect to the foundation 7 by means of two hollow end journals, also called neck bearings 5, 6, formed with a smaller radius than the grinding drum, and by means of a pinion 10 driven by an electric motor 8 via a gear 9, which in a on the jacket the grinding drum 4 engages peripherally arranged ring gear 11, driven. The ground goods are left after leaving the grinding drum 4 is passed through an axial discharge opening 12 via an air conveyor trough 13 to a vertical conveyor 14 which is designed as a bucket elevator. This bucket elevator 14 is set up in a foundation pit 15 and conveys the ground material to a floor 16 above the grinding drum 4. From this bucket elevator 14, the ground material is fed to an air classifier 17, from which, after separation of the ground material into coarse and fine material (finished product ) the coarse material is in turn fed to the feed lock 2 by means of a conveyor device 18, whereas the fine material leaves the grinding system by means of a continuous conveyor 19. The classifier could also be a cyclone air classifier.

In den Fig. 3 und 4 ist eine erfindungsgemäße Mahlanlage dargestellt. Die Mahltrommel und ihr Antrieb sind im wesentlichen gleich ausgeführt wie bei der bekannten Anlage..Die Austragsöffnung mündet jedoch bei der erfindungsgemäßen Anlage in eine koaxial zur Mahltrommel 4 angeordnete und mit dieser drehfest verbundene und daher gemeinsam drehbare Austragskammer 20. Die Austragskammer ist rotationssymmetrisch ausgebildet und weist einen sich kegelförmig erweiternden Einlaufteil 21, einen daran anschließenden, sich in radialer Richtung erstreckenden Mantel 22 und einen von dem Umfang dieses Mantels ausgehenden zylindrischen Mantel 23 auf, der an seinem äußeren Ende, d.h. an der Stirnseite 24 der Austragskammer, mit einem ringförmigen, sich radial, nach innen erstreckenden Bord 25 versehen ist. Stirnseitig ist die Austragskammer 20 mit einer stationären, an einem ortsfesten Gestell 26 montierten Abdeckung 27 versehen, die eine zentrische öffnung 28 für die Abfuhr von Luft oder anderen Gasen (Brüden) aufweist, die über eine Leitung 29 abgesaugt wird (werden). Die stationäre Abdeckung weist einen zylindrischen Bord 30 auf, der gegenüber dem radial nach innen gerichteten Bord 25 der Austragskammer mittels einer nicht dargestellten Dichtung, beispielsweise einer Labyrinthdichtung gegen angesaugte Falschluft weitgehend gedichtet ist. Oberhalb der Austragsöffnung 12 der Mahltrommel 4 weist die stationäre Abdeckung 27 eine Abgabeöffnung 31 für das Mahlgut auf. Seitlich neben der Abgabeöffnung 31 ist an der stationären Abdeckung 27 ein Abstreifer 32 montiert, welcher Abstreifkanten 33 aufweist, die in geringem Abstand 34 von dem radialen und zylindrischen Mantel 22, 23 liegen. An die Abgabeöffnung 31 ist eine Luftförderrinne 35 angeschlossen, in der das Mahlgut auf ein Diaphragma 36.gelangt. Unterhalb des Diaphragmas ist ein Kanal 37 für die Zufuhr von Druckluft vorgesehen. Das Mahlgut selbst wird in dem oberhalb des Diaphragmas angeordneten Förderkanal 38 mittels der das Diaphragma durchsetzenden Druckluft zu einem unmittelbar neben der Mahltrommel 4, d.h. auf etwa gleichem Niveau angeordneten Windsichter 17 zugeführt. In diesem Windsichter 17.bekannter Bauart wird das Mahlgut in Grob- und Fertiggut gesichtet. Das Grobgut gelangt mittels einer Fördereinrichtung 39, die vorzugsweise als Förderband ausgebildet ist, wiederum zur Aufgabeschleuse 2 der Mahltrommel 4. Das Fertiggut wird mittels eines Stetigförderers 40, beispielsweise mittels einer Luftförderrinne abtransportiert.3 and 4, a grinding plant according to the invention is shown. The grinding drum and its drive are designed essentially the same as in the known system. However, the discharge opening in the system according to the invention opens into a discharge chamber 20 which is arranged coaxially with the grinding drum 4 and is rotatably connected to it and therefore rotates together. The discharge chamber is designed to be rotationally symmetrical and has a conically widening inlet part 21, an adjoining jacket 22 which extends in the radial direction and a cylindrical jacket 23 extending from the circumference of this jacket, which at its outer end, ie on the end face 24 of the discharge chamber, has an annular, radially, inwardly extending board 25 is provided. On the face side, the discharge chamber 20 is provided with a stationary cover 27 which is mounted on a stationary frame 26 and which has a central opening 28 for the removal of air or other gases (vapors) which is (are) sucked off via a line 29. The stationary cover has a cylindrical rim 30, which is opposite the radially inward rim 25 of the discharge chamber by means of a seal, not shown, for example a laby Rinth seal is largely sealed against sucked-in false air. Above the discharge opening 12 of the grinding drum 4, the stationary cover 27 has a discharge opening 31 for the ground material. Laterally next to the discharge opening 31, a scraper 32 is mounted on the stationary cover 27, which has scraper edges 33 which are at a short distance 34 from the radial and cylindrical jacket 22, 23. An air conveyor trough 35 is connected to the discharge opening 31, in which the ground material arrives at a diaphragm 36. A channel 37 is provided below the diaphragm for the supply of compressed air. The ground material itself is fed in the conveying channel 38 arranged above the diaphragm by means of the compressed air passing through the diaphragm to a wind sifter 17 arranged directly next to the grinding drum 4, ie at approximately the same level. In this 17th class air classifier, the ground material is sifted into coarse and finished material. The coarse material in turn is conveyed to the feed lock 2 of the grinding drum 4 by means of a conveyor device 39, which is preferably designed as a conveyor belt.

Wie aus den Fig. 3 und 4 ersichtlich ist, sind alle Anlagenteile auf dem Hallenflur 41 angeordnet und mittels eines einzigen Montagelaufkranes 42 im Falle einer.Reparatur etc. zu bedienen. Die Länge 43 und Breite 44 der Halle entspricht etwa der Länge 43 und Breite 44 einer Halle einer gleiche Leistung aufweisenden bekannten Anlage, wie sie in den Fig. 1 und 2 dargestellt ist.As can be seen from FIGS. 3 and 4, all system parts are arranged on the hallway 41 and can be operated by means of a single overhead traveling crane 42 in the event of a repair, etc. The length 43 and width 44 of the hall corresponds approximately to the length 43 and width 44 of a hall of a known system having the same power, as is shown in FIGS. 1 and 2.

Die Funktion der Austragskammer 20 ist folgende: Die Mahltrommel 4 dreht sich mit unterkritischer Drehzahl n, d.h. das Mahlgut wird bei Drehung der Mühle infolge von Reibung an der Mahltrommel beschleunigt und durch die Zentrifugalkraft am Trommelmantel hochgetragen. Sobald die radial gerichtete Komponente der Schwerkraft größer als die Zentrifugalkraft wird, lösen sich die Mahlkörper und Mahlgutteilchen von der Trommelwand und fallen wieder nach unten. Der Durchmesser D der Austragskammer 20 ist erfindungsgemäß so ausgelegt, daß die an dem zylindrischen Mantel 23 der Austragskammer 20 wirkende Zentrifugalkraft stets größer ist als die radial gerichtete Komponente der Schwerkraft, wodurch das durch die Austragsöffnung 12 aus der-Mahltrommel 4 austretende Mahlgut zunächst zufolge Schwerkraftwirkung an die peripheren Mantelteile 22, 23, 25 der Austragskammer 20 gelangt und sodann an diesen infolge der Zentrifugalkraft haften bleibt, bis es zu dem oberhalb der Austragsöffnung vorgesehenen Abstreifer 32 gehoben ist.,Der Abstreifer 32 löst das Mahlgut von den Mantelteilen 22, 23, 25 der Austragskammer 20, wonach das Mahlgut durch die Abgabeöffnung 31 zur Luftförderrinne 35 gefördert wird.The function of the discharge chamber 20 is as follows: the grinding drum 4 rotates at a subcritical speed n, ie the grinding material is accelerated when the mill rotates due to friction on the grinding drum and is carried up by the centrifugal force on the drum casing. Once the radially directed component of gravity is larger than the centri force, the grinding media and regrind particles loosen from the drum wall and fall down again. The diameter D of the discharge chamber 20 is designed according to the invention such that the centrifugal force acting on the cylindrical jacket 23 of the discharge chamber 20 is always greater than the radially directed component of gravity, as a result of which the ground material emerging through the discharge opening 12 from the grinding drum 4 initially due to the effect of gravity reaches the peripheral jacket parts 22, 23, 25 of the discharge chamber 20 and then adheres to them as a result of the centrifugal force until it is raised to the stripper 32 provided above the discharge opening., The stripper 32 detaches the ground material from the jacket parts 22, 23, 25 of the discharge chamber 20, after which the regrind is conveyed through the discharge opening 31 to the air conveyor trough 35.

In Fig. 6 ist der Materialfluß in der Austragskammer 20 schematisch dargestellt. Da die Abstreifkanten 33 des Abstreifers 32 in geringem Abstand 34 von den Mantelteilen 22, 23, 25 der Austragskammer angeordnet sind, bleibt stets wie aus Fig. 6 ersichtlich, eine dünne Schicht 45 Mahlgut an dem zylindrischen Mantelteil 23 haften.6, the material flow in the discharge chamber 20 is shown schematically. Since the scraper edges 33 of the scraper 32 are arranged at a short distance 34 from the casing parts 22, 23, 25 of the discharge chamber, a thin layer 45 of regrind always adheres to the cylindrical casing part 23, as can be seen in FIG. 6.

Der Mindestdurchmesser Dmin für die Austragskammer läßt sich aus der kritischen Drehzahl nkrit' bei der das Material an der zylindrischen Mantelfläche haften bleibt, und dem Durchmesser d der Mahltrommel überschlagsmäßig wie folgt berechnen:The minimum diameter D min for the discharge chamber can be calculated from the critical speed n crit ' at which the material adheres to the cylindrical surface and the diameter d of the grinding drum as follows:

Die Drehzahl n einer Mühle wird gemäß der Formel

Figure imgb0001
und die kritische Drehzahl nkrit überschlagsmäßig aus der Formel
Figure imgb0002
errechnet.The speed n of a mill is calculated according to the formula
Figure imgb0001
 and the critical speed n crit is estimated from the formula
Figure imgb0002
 calculated.

Da für den minimalen Durchmesser Dmin der Austragskammer die kritische Drehzahl mindestens erreicht werden soll, folgt aus der Gleichung

Figure imgb0003
Figure imgb0004
 Since the critical speed for the minimum diameter D min of the discharge chamber should at least be reached, it follows from the equation
Figure imgb0003
Figure imgb0004

Ein weiterer Vorteil der erfindungsgemäßen Anlage ist darin zu sehen, daß durch die einen größeren Durchmesser D als die Austragsöffnung 12 aufweisende Austragskammer 20 die Strömungsgeschwindigkeit der aus der Austragsöffnung 12 austretenden Gase stark herabgesetzt wird. Folglich wird eine leichte Trennung des staubförmigen Mahlgutes von den Brüden und damit eine Entlastung der Entstaubungsaggregate gewährt.Another advantage of the system according to the invention is that the discharge chamber 20, which has a larger diameter D than the discharge opening 12, greatly reduces the flow velocity of the gases emerging from the discharge opening 12. As a result, easy separation of the dust-like ground material from the vapors and thus relief of the dedusting units is granted.

In Fig. 7 ist eine Variante 46 der erfindungsgemäßen Austragskammer dargestellt, bei der der Durchmesser so gewählt ist, daß das Material nicht durch die Fliehkraft an der zylindrischen Mantelfläche haften bleibt. Das Mahlgut wird hier mittels becherförmiger Schaufeln 47, die an der zylindrischen bzw. radialen Mantelfläche befestigt sind, hochgef'ördert und rutscht von den Schaufeln, sobald diese ihre oberste Stellung erreicht haben, auf eine durch eine Abgabeöffnung in das Innere der Austragskammer 46 ragende Luftförderrinne 48 , die das Mate- rial ähnlich wie bei der in den Fig. 3 und 4 dargestellten Anlage zu einem Windsichter fördert. Bei dieser Ausführungsform kann der Durchmesser der Austragskammer 46 so klein wie möglich (auch kleiner als der Durchmesser d der Mahltrommel) gehalten werden; der Mindestdurchmesser wird nur bestimmt durch die notwendige Förderhöhe, die das Mahlgut von der Austragsöffnung zum Windsichter zurücklegen muß. Aus diesem Grund eignet sich diese Ausführungsform besonders für langsam laufende Mahltrommeln mit großen Durchmessern.FIG. 7 shows a variant 46 of the discharge chamber according to the invention, in which the diameter is selected so that the material does not adhere to the cylindrical lateral surface due to the centrifugal force. The regrind is conveyed up here by means of cup-shaped blades 47, which are fastened to the cylindrical or radial lateral surface, and slips from the blades as soon as they have reached their uppermost position, onto an air conveyor trough projecting into the interior of the discharge chamber 46 through a discharge opening 48, the ATE M rial similar to the embodiment shown in FIGS. 3 and 4 promotes plant to an air classifier. In this embodiment, the diameter of the discharge chamber 46 can be kept as small as possible (also smaller than the diameter d of the grinding drum); the minimum diameter is only determined by the necessary delivery head that the regrind has to travel from the discharge opening to the air classifier. For this reason, this embodiment is particularly suitable for slow-running grinding drums with large diameters.

Claims (8)

1. Mahlanlage mit einer rotierenden, liegend angeordneten Mahltrommel (4), an deren einem Ende eine axiale Eintritts5ffnung (3) und an deren anderem Ende eine axiale Austragsöffnung (12) vorgesehen sind, wobei die Mahlanlage eine das Mahlgut von der Austragsöffnung (12) der Mahltrommel auf ein Niveau oberhalb der Austragsöffnung fördernde Fördereinrichtung (20) aufweist, dadurch gekennzeichnet, daß die Austragsöffnung (12) in eine um eine etwa horizontale Achse rotierende, rotationssymmetrisch ausgebildete Austragskammer (20, 46) mündet, deren das Mahlgut fördernde Mantelteile (22, 23, 25) sich von einem Niveau unterhalb bis zu einem Niveau oberhalb der Austragsöffnung (12) erstrecken und die Austragskammer (20, 46) oberhalb der Austragsöffnung (12) eine Abnahmeeinrichtung (31, 32, 35) für das Mahlgut besitzt.1. Grinding plant with a rotating, lying arranged grinding drum (4), at one end of which there is an axial inlet opening (3) and at the other end of which an axial discharge opening (12) is provided, the grinding plant holding the ground material from the discharge opening (12) of the grinding drum to a level above the discharge opening conveying conveyor (20), characterized in that the discharge opening (12) opens into a rotationally symmetrical discharge chamber (20, 46) rotating about an approximately horizontal axis, the jacket parts (22 , 23, 25) extend from a level below to a level above the discharge opening (12) and the discharge chamber (20, 46) above the discharge opening (12) has a removal device (31, 32, 35) for the regrind. 2. Anlage nach Anspruch 1, dadurch gekennzeichnet, daß die Austragskammer (20, 46) koaxial zur Mahltrommel (4) angeordnet ist.2. Plant according to claim 1, characterized in that the discharge chamber (20, 46) is arranged coaxially to the grinding drum (4). 3. Anlage nach Anspruch 2, dadurch gekennzeichnet, daß die Austragskammer (20, 46) an der Mahltrommel (4) fliegend gelagert und drehfest befestigt ist.3. Plant according to claim 2, characterized in that the discharge chamber (20, 46) on the grinding drum (4) is overhung and fixed in a rotationally fixed manner. 4. Anlage nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß die Austragskammer (20) einen größeren, vorzugsweise einen um mindestens mehr als 1,75-fach größeren Durchmesser (D) aufweist als die Mahltrommel (4) (Fig. 3, 4).4. Plant according to claims 1 to 3, characterized in that the discharge chamber (20) has a larger, preferably a by at least more than 1.75 times larger diameter (D) than the grinding drum (4) (Fig. 3, 4). 5. Anlage nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß ein ortsfest angeordneter Abstreifer (32) von der Stirnseite (24) der Austragskammer (20) her in das Innere der Austragskammer in deren oberhalb der Austragsöffnung (12) befindlichen Teil ragt, wobei,Abstreifkanten (33) des Abstreifers in geringem Abstand (34) von den das Mahlgut fördernden Mantelteilen (22, 23, 25) der Austragskammer (20) angeordnet sind (Fig. 3, 4, 5).5. Plant according to claims 1 to 4, characterized in that a fixedly arranged scraper (32) from the end face (24) of the discharge chamber (20) in the interior of the discharge chamber in the above The discharge opening (12) protrudes, the scraper edges (33) of the scraper being arranged at a short distance (34) from the jacket parts (22, 23, 25) of the discharge chamber (20) conveying the ground material (FIGS. 3, 4, 5 ). 6. Anlage nach Anspruch 5, dadurch gekennzeichnet, daß die Stirnseite (24) der Austragskammer (20) mit einer stationär angeordneten, gegenüber der rotierenden Austragskammer abgedichteten Abdeckung (27) versehen ist, die eine Abgabeöffnung (31) für das Mahlgut aufweist, und daß der Abstreifer (32) an der Abdeckung (27) bei der Abgabeöffnung (31) befestigt ist (Fig. 3, 4, 5).6. Plant according to claim 5, characterized in that the end face (24) of the discharge chamber (20) is provided with a stationarily arranged, with respect to the rotating discharge chamber sealed cover (27) which has a discharge opening (31) for the regrind, and that the scraper (32) is attached to the cover (27) at the discharge opening (31) (Fig. 3, 4, 5). 7. Anlage nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß an den Mantelteilen der Austragskammer (46) becherförmige, im Abstand von der Austragsöffnung (12) endende Schaufeln (47) angeordnet sind und daß ein Stetigförderer (48) bis in das Innere der Austragskammer zur Abnahme des von den Schaufeln geförderten Gutes ragt (Fig. 7).7. Plant according to claim 2 or 3, characterized in that on the jacket parts of the discharge chamber (46) cup-shaped, at a distance from the discharge opening (12) ending blades (47) are arranged and that a continuous conveyor (48) into the interior of the Discharge chamber for removing the material conveyed by the blades protrudes (Fig. 7). 8. Anlage nach den Ansprüchen 1 bis 7 mit einem geschlossenen Kreislauf, gekennzeichnet durch die Kombination folgender Merkmale: - daß eine liegend angeordnete, rotierende Mahltrommel (4) mit einer axialen Eintritts- (3) und einer axialen Austragsöffnung (12) vorgesehen ist, - daß die Austragsöffnung (12) in eine koaxial zur Mahltrommel (4) angeordnete und an der Mahltrommel drehfest montierte Austragskammer (20) mündet, - daß die Austragskammer (20) einen größeren Durchmesser (D) aufweist als die Mahltrommel, wobei sich der Mantel der Mahltrommel (4) mit unterkritischer und der Mantel (23) der Austragskammer (20) mit überkritischer Umfangsgeschwindigkeit bewegen, - daß die Austragskammer (20) oberhalb der Austragsöffnung (12) eine Abnahmeinrichtung (31, 32) für das Mahlgut besitzt; - daß von der Abnahmeeinrichtung (31, 32) eine das Mahlgut fördernde Fördereinrichtung (35) zu einem Sichter (17) führt, - daß der Sichter (17) unmittelbar neben der Mahltrommel (4) und in etwa gleicher Höhenlage wie die Mahltrommel und mit dieser auf einer gemeinsamen Etage, insbesondere auf dem Hallenflur (41) angeordnet ist, und - daß vom Sichter (17) eine das Grobgut zur Eintrittsöffnung (3) fördernde Fördereinrichtung (39) vorgesehen ist (Fig. 3, 4). 8. Plant according to claims 1 to 7 with a closed circuit, characterized by the combination of the following features: - That a horizontally arranged, rotating grinding drum (4) with an axial inlet (3) and an axial discharge opening (12) is provided, - That the discharge opening (12) opens into a discharge chamber (20) which is arranged coaxially to the grinding drum (4) and is mounted on the grinding drum in a rotationally fixed manner, - That the discharge chamber (20) has a larger diameter (D) than the grinding drum, the jacket of the grinding drum (4) moving with subcritical and the jacket (23) of the discharge chamber (20) with supercritical peripheral speed, - That the discharge chamber (20) above the discharge opening (12) has a removal device (31, 32) for the regrind; - That from the take-off device (31, 32) leads a conveying device conveying the regrind (35) to a sifter (17), - That the classifier (17) is arranged directly next to the grinding drum (4) and at approximately the same height as the grinding drum and with it on a common floor, in particular on the hallway (41), and - That from the classifier (17) a coarse material to the inlet opening (3) conveying conveyor (39) is provided (Fig. 3, 4).
EP19810890069 1980-04-24 1981-04-22 Grinding plant Expired EP0038794B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT220680A AT366595B (en) 1980-04-24 1980-04-24 MILLING PLANT
AT2206/80 1980-04-24

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EP0038794A2 true EP0038794A2 (en) 1981-10-28
EP0038794A3 EP0038794A3 (en) 1981-12-30
EP0038794B1 EP0038794B1 (en) 1984-10-31

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AT (1) AT366595B (en)
DE (1) DE3166909D1 (en)
DK (1) DK184781A (en)
ES (1) ES8300504A1 (en)
IN (1) IN155719B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115888959A (en) * 2022-11-24 2023-04-04 临沂会宝岭铁矿有限公司 Iron ore presses down dirt breaker

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE697940C (en) * 1939-09-03 1940-10-28 Polysius Akt Ges G Discharge device for circulating drying drums or the like.
DE1128267B (en) * 1958-10-29 1962-04-19 Polysius Gmbh Mill drying system with mechanical material transport
DE1200655B (en) * 1961-06-29 1965-09-09 Ind G M B H Plant for grinding and drying cement raw material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE697940C (en) * 1939-09-03 1940-10-28 Polysius Akt Ges G Discharge device for circulating drying drums or the like.
DE1128267B (en) * 1958-10-29 1962-04-19 Polysius Gmbh Mill drying system with mechanical material transport
DE1200655B (en) * 1961-06-29 1965-09-09 Ind G M B H Plant for grinding and drying cement raw material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115888959A (en) * 2022-11-24 2023-04-04 临沂会宝岭铁矿有限公司 Iron ore presses down dirt breaker
CN115888959B (en) * 2022-11-24 2023-06-27 临沂会宝岭铁矿有限公司 Iron ore dust suppression breaker

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ATA220680A (en) 1981-09-15
EP0038794B1 (en) 1984-10-31
EP0038794A3 (en) 1981-12-30
DE3166909D1 (en) 1984-12-06
IN155719B (en) 1985-02-23
JPS5735946A (en) 1982-02-26
ES501643A0 (en) 1982-11-01
AT366595B (en) 1982-04-26
DK184781A (en) 1981-10-25
ES8300504A1 (en) 1982-11-01

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