EP0677329A1 - Ring ball mill - Google Patents

Ring ball mill Download PDF

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Publication number
EP0677329A1
EP0677329A1 EP95105381A EP95105381A EP0677329A1 EP 0677329 A1 EP0677329 A1 EP 0677329A1 EP 95105381 A EP95105381 A EP 95105381A EP 95105381 A EP95105381 A EP 95105381A EP 0677329 A1 EP0677329 A1 EP 0677329A1
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EP
European Patent Office
Prior art keywords
grinding
ball
mill
force
force application
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.)
Withdrawn
Application number
EP95105381A
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German (de)
French (fr)
Inventor
Jürgen Dipl.-Ing. Cordes
Günther Dipl.-Ing. Knorr
Jens-Peter Dipl.-Ing. Thiel
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.)
Claudius Peters AG
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Babcock Materials Handling AG
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Publication date
Application filed by Babcock Materials Handling AG filed Critical Babcock Materials Handling AG
Publication of EP0677329A1 publication Critical patent/EP0677329A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/12Mills with at least two discs or rings and interposed balls or rollers mounted like ball or roller bearings

Definitions

  • the invention relates to a ball ring mill with a mill housing, a grinding track and grinding balls, which are acted upon by an external force and run on the grinding track and comminute the ground material.
  • the grinding track is formed by a lower driven grinding ring, on which the grinding balls run. These, in turn, are pressed against the grinding path by an upper grinding ring which is acted upon by an external force generated in a special device (generally a spring or hydraulic device).
  • a special device generally a spring or hydraulic device.
  • Ball ring mills are used in particular for coal grinding in coal dust furnaces and for gypsum grinding in the production of gypsum. They are subject to considerable wear during operation, which is caused both by the removal of material from the moving parts of the mill and by material fatigue in the parts of the mill which do not directly participate in the actual grinding process.
  • the invention has for its object to provide a ball ring mill of the type mentioned, in which the grinding set (parts that are either directly involved in the grinding process or are used to transfer the grinding force and / or the torque to the immediately grinding parts), has a longer service life than previously known mills and which also reduces wear on the other parts of the mill due to material fatigue.
  • the invention solves this problem in a ball ring mill according to the preamble of the main claim in that a separate pressure device for transmitting the external force to this grinding ball is provided for each grinding ball.
  • the invention has recognized that the one-piece upper grinding ring used in the prior art, which presses the grinding balls onto the grinding track, is disadvantageous in several respects. Disturbances in the grinding process, for example the rolling over of a hard foreign body by a single grinding ball, simultaneously influence all other grinding balls via this one-piece upper grinding ring. This can lead to undesirable vibration excitation, especially in the range of the natural frequencies of many mill parts, so that resonances can occur which can lead to fatigue and destruction of the mill structure. In the mill according to the invention, however, because of the separate pressing device for each grinding ball, the balls are guided individually and are thus decoupled from one another to a greater extent than in the prior art, disturbances in the course of a ball cannot be transferred or to a lesser extent to the other grinding balls.
  • Each pressure device expediently has a spherical cap surface as a pressure surface acting on the grinding ball.
  • a spherical cap surface as a pressure surface acting on the grinding ball.
  • Each pressure device can be connected to a common force application member.
  • This common force application element can be designed, for example, as a shaft which is acted upon by the external force and is arranged centrally with respect to the axis of rotation of the mill. This shaft is then acted upon by the external force in the area of the mill foundation, for example, and guides it via rigidly connected to it Arms into each pressure device.
  • each force application member applies the grinding force to the associated grinding ball completely independently of the other force application members and grinding balls and is accordingly also connected to its own external power source.
  • the grinding balls run largely independently of one another, so that mutual interference in the event of faults such as rolling over foreign bodies is almost completely ruled out.
  • each force application member can be designed as an arm connected to the respective pressing device, which is articulated on a shaft arranged centrally with respect to the axis of rotation of the mill.
  • Each arm is then connected to its own external power source, for example a spring device, and thus applies the grinding force to the associated pressure device.
  • the centrally arranged shaft itself no longer serves as a force application element, but merely as an abutment for deriving the grinding force into the mill housing.
  • each force application member is designed as a toggle lever which is acted upon by the external force and which is articulated on the pressure device and on the mill housing.
  • a compression spring arranged between the mill housing and the toggle lever can be provided as the external power source.
  • the area of the mill housing in which the toggle levers are articulated generally the housing area surrounding the grinding chamber, must be designed to be sufficiently stable to be able to absorb and derive the grinding force as an abutment.
  • the pressure devices have spherical cap surfaces as pressure surfaces acting on the grinding balls, there is a rubbing movement between the grinding balls and the pressure devices during the grinding process. So that the wear caused by this friction of grinding balls and Pressure devices remains low, a lubrication that reduces this friction is expediently provided. Under certain circumstances, the dust corresponding to the grinding process can serve as a lubricant. However, it is advantageous if lubrication devices are provided for injecting a special lubricant between the contact surfaces of balls and pressure devices. For example, coal, water or a coal-water dispersion can serve as a lubricant. Instead of coal, another solid to be ground can also be used as a lubricant. Liquid lubricants are injected by means of a high-pressure pump through a corresponding opening in the pressure devices.
  • the pressure devices can be stationary in relation to the mill housing in grinding operation. However, it is also conceivable to design the pressure devices to be rotatable about the grinding axis. For this purpose, for example in the above-described embodiments with a central shaft, this shaft can be provided with drive devices by means of which it can be set into a rotary movement.
  • Embodiments of the invention have been mentioned above, in which either a common force application element for all pressure devices or separate force application elements are provided for each individual pressure device. Intermediate solutions are also conceivable within the scope of the invention, in which one force application member acts on the plurality, but not all, of the separate pressure devices with the grinding force.
  • a gear 2 is arranged in the foundation 1 of the ball ring mill, to which drive power is supplied via the clutch 3.
  • the transmission 2 has a vertical output hub 4, which is mounted in the transmission 2 in an axial pressure bearing, which receives the grinding pressure.
  • This hub 4 is integrally connected to a turntable 5 on which the lower grinding ring 6 is mounted and connected to it in a rotationally fixed manner.
  • Rolling balls 7 roll on the lower grinding ring 6, each of which is pressed against the lower grinding ring 6 by a separate pressure device 8.
  • the pressure devices 8 have a spherical cap surface facing the lower grinding ring 6 as the pressure surface for the grinding balls 7.
  • a toggle lever 9 is articulated to each pressure device 8, which in turn is articulated at 10 to the mill housing.
  • each grinding ball 7 is acted upon by the grinding force by a separate pressure device 8, toggle lever 9 and compression spring 11.
  • devices can be provided in the drawing which press lubricant between these contact surfaces.
  • the compression springs 11 are not supported directly on the mill housing, but on a hydraulic device, not shown in the drawing, by means of which the spring preload and thus the grinding force can be adjusted.
  • regrind is fed to the grinding chamber 15 via a task 13 provided with a plate feeder 12 and through a nozzle 14.
  • the ground material which is introduced approximately in the center of the grinding chamber 15, is ground between the lower grinding ring 6 and the grinding balls 7 and, due to the centrifugal effect of the rotating lower grinding ring 6, is carried outwards.
  • the lower grinding ring 6 is surrounded by an annular space 16 which is fed with air via a nozzle 17.
  • the air is blown upwards at high speed through an annular gap 18 and takes the ground material with it to the air classifier 19.
  • the ground material is guided past the control flaps 20 into the funnel 21 of the air classifier. Sufficiently ground ground material is discharged through the nozzle 22 with the outflowing air.
  • the desired fineness can be adjusted by adjusting the control flaps 20. If, during operation of the mill, the run of a grinding ball 7 is disturbed, for example, by rolling over foreign bodies, the running of the remaining grinding balls 7 is not affected by this disturbance. It will therefore, neither forces occurring due to the foreign body rollover are transferred to the other grinding balls, nor is there any mutual interference in the sense of undesirable vibration excitation.
  • the mill housing does not directly serve as an abutment for the grinding force, rather an additional shaft 24 is provided which is arranged centrally with respect to the axis of rotation of the mill and is mounted in the gear 2 so that it has tensile forces can record.
  • the shaft 24 can be freely rotated relative to the hub 4, the turntable 5 and the lower grinding ring 6, and it can optionally have its own drive device. Under certain circumstances, the shaft 24 can also be arranged in a stationary manner with respect to the mill housing. In no case is it non-rotatably connected to the hub 4, the turntable 5 and the lower grinding ring 6.
  • Arms or levers 26 are articulated at 25 at the tip of the shaft 24, each of which is articulated at 27 to a pressure device 8.
  • Each lever 26 is spring-loaded by means of a tension spring 28 arranged between this lever and the shaft 24, it transmits this spring force to the associated pressure device 8 and thus to the respective grinding ball 7.
  • a shaft 29 is provided which is arranged centrally with respect to its axis of rotation and which, like the shaft 24 of the embodiment shown in FIG. It can also be driven or possibly also stationary with respect to the mill housing.
  • the shaft 29 does not serve as an abutment for absorbing the grinding force, but rather as the actual force application element; it is acted upon in the transmission 2 by a device (not shown) (for example a spring or hydraulic device) with the external force or grinding force.
  • the shaft 29 is rigidly connected to arms 30, which each lead to the pressure devices 8 and thus apply the grinding force to them.
  • the shaft 29 is thus subjected to the entire grinding force for all grinding balls; this grinding force is distributed via the arms 30 to the respective pressure devices 8 and thus to the grinding balls 7.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

The ball ring mill has a mill housing, a grinding track (6) and grinding balls (7) which are activated by an outside force and run on the grinding track. For each grinding ball a separate pressure mechanism (8) is provided for transmission of the outside force on the grinding balls. Each pressure mechanism has a ball dome surface as pressure surface acting on the grinding balls. Each pressure mechanism is connected to a common force application component. The common force application component is formed as a shaft fed with outside force and arranged centrally in relation to the rotary axis of the mill. <IMAGE>

Description

Die Erfindung betrifft eine Kugelringmühle mit einem Mühlengehäuse, einer Mahlbahn und Mahlkugeln, die von einer Fremdkraft beaufschlagt auf der Mahlbahn ablaufen und das Mahlgut zerkleinern.The invention relates to a ball ring mill with a mill housing, a grinding track and grinding balls, which are acted upon by an external force and run on the grinding track and comminute the ground material.

Bei aus offenkundiger Vorbenutzung bekannten Kugelringmühlen wird die Mahlbahn von einem unteren angetriebenen Mahlring gebildet, auf dem die Mahlkugeln ablaufen. Diese wiederum werden von einem mit einer in einer besonderen Einrichtung (in der Regel eine Feder- oder Hydraulikeinrichtung) erzeugten Fremdkraft beaufschlagten oberen Mahlring gegen die Mahlbahn gedrückt.In ball ring mills known from prior public use, the grinding track is formed by a lower driven grinding ring, on which the grinding balls run. These, in turn, are pressed against the grinding path by an upper grinding ring which is acted upon by an external force generated in a special device (generally a spring or hydraulic device).

Kugelringmühlen werden insbesondere zur Kohlevermahlung bei Kohlenstaubfeuerungen und zur Gipsvermahlung bei der Gipsherstellung eingesetzt. Sie unterliegen im Betrieb einem erheblichen Verschleiß, der sowohl durch Abtragung von Material von den bewegten Mühlenteilen als auch durch Materialermüdung der am eigentlichen Mahlvorgang nicht unmittelbar teilnehmenden Mühlenteile bewirkt wird.Ball ring mills are used in particular for coal grinding in coal dust furnaces and for gypsum grinding in the production of gypsum. They are subject to considerable wear during operation, which is caused both by the removal of material from the moving parts of the mill and by material fatigue in the parts of the mill which do not directly participate in the actual grinding process.

Der Erfindung liegt die Aufgabe zugrunde, eine Kugelringmühle der eingangs genannten Art zu schaffen, bei der die Mahlgarnitur (Teile, die entweder unmittelbar selbst am Mahlvorgang beteiligt sind oder die zur Übertragung der Mahlkraft und/oder des Drehmoments auf die unmittelbar mahlenden Teile dienen), eine gegenüber vorbekannten Mühlen höhere Standzeit aufweist und bei der auch der Verschleiß an den übrigen Mühlenteilen infolge Materialermüdung vermindert ist.The invention has for its object to provide a ball ring mill of the type mentioned, in which the grinding set (parts that are either directly involved in the grinding process or are used to transfer the grinding force and / or the torque to the immediately grinding parts), has a longer service life than previously known mills and which also reduces wear on the other parts of the mill due to material fatigue.

Die Erfindung löst diese Aufgabe bei einer Kugelringmühle gemäß dem Oberbegriff des Hauptanspruchs dadurch, daß für jede Mahlkugel eine separate Andruckeinrichtung zum Übertragen der Fremdkraft auf diese Mahlkugel vorgesehen ist.The invention solves this problem in a ball ring mill according to the preamble of the main claim in that a separate pressure device for transmitting the external force to this grinding ball is provided for each grinding ball.

Die Erfindung hat erkannt, daß der im Stand der Technik verwendete einteilige obere Mahlring, der die Mahlkugeln auf die Mahlbahn preßt, in mehrerlei Hinsicht nachteilig ist. Störungen des Mahlvorgangs, beispielsweise die Überrollung eines harten Fremdkörpers durch eine einzelne Mahlkugel, beeinflussen über diesen einteiligen oberen Mahlring gleichzeitig auch alle anderen Mahlkugeln. Dies kann zu einer unerwünschten Schwingungsanregung, insbesondere auch im Bereich der Eigenfrequenzen vieler Mühlenteile, führen, so daß Resonanzen auftreten können, die zur Ermüdung und Zerstörung der Mühlenstruktur führen können. Bei der erfindungsgemäßen Mühle werden jedoch aufgrund der separaten Andruckeinrichtung für jede Mahlkugel die Kugeln einzeln geführt und sind somit in stärkerem Maße als im Stand der Technik voneinander entkoppelt, Störungen im Lauf einer Kugel können sich nicht oder in geringerem Maße auf die übrigen Mahlkugeln übertragen.The invention has recognized that the one-piece upper grinding ring used in the prior art, which presses the grinding balls onto the grinding track, is disadvantageous in several respects. Disturbances in the grinding process, for example the rolling over of a hard foreign body by a single grinding ball, simultaneously influence all other grinding balls via this one-piece upper grinding ring. This can lead to undesirable vibration excitation, especially in the range of the natural frequencies of many mill parts, so that resonances can occur which can lead to fatigue and destruction of the mill structure. In the mill according to the invention, however, because of the separate pressing device for each grinding ball, the balls are guided individually and are thus decoupled from one another to a greater extent than in the prior art, disturbances in the course of a ball cannot be transferred or to a lesser extent to the other grinding balls.

Zweckmäßigerweise weist jede Andruckeinrichtung eine Kugelkalottenfläche als auf die Mahlkugel wirkende Andruckfläche auf. Auf diese Weise wird jede Mahlkugel einerseits sicher geführt, andererseits können die Mahlkugeln sich um jede Achse frei drehen, wobei sie sich dann reibend gegenüber ihrer Andruckfläche bewegen.Each pressure device expediently has a spherical cap surface as a pressure surface acting on the grinding ball. In this way, each grinding ball is guided safely on the one hand, on the other hand, the grinding balls can rotate freely about each axis, whereby they then move frictionally against their pressure surface.

Jede Andruckeinrichtung kann mit einem gemeinsamen Kraftbeaufschlagungsorgan verbunden sein. Dies bedeutet, daß lediglich eine Fremdkraftquelle (beispielsweise Feder- oder Hydraulikeinrichtung) vorhanden ist, die über dieses gemeinsame Kraftbeaufschlagungsorgan jede Andruckeinrichtung mit der Mahlkraft beaufschlagt. Dieses gemeinsame Kraftbeaufschlagungsorgan kann beispielsweise als mit der Fremdkraft beaufschlagte, zentrisch bezüglich der Drehachse der Mühle angeordnete Welle ausgebildet sein. Diese Welle wird dann beispielsweise im Bereich des Mühlenfundamentes mit der Fremdkraft beaufschlagt und leitet diese über starr mit ihr verbundene Arme in jede Andruckeinrichtung ein.Each pressure device can be connected to a common force application member. This means that there is only one external power source (for example spring or hydraulic device) which acts on each pressing device with the grinding force via this common force application member. This common force application element can be designed, for example, as a shaft which is acted upon by the external force and is arranged centrally with respect to the axis of rotation of the mill. This shaft is then acted upon by the external force in the area of the mill foundation, for example, and guides it via rigidly connected to it Arms into each pressure device.

Besonders vorteilhaft ist es aber, wenn für jede Andruckeinrichtung ein separates Kraftbeaufschlagungsorgan vorgesehen ist. Dies bedeutet, daß jedes Kraftbeaufschlagungsorgan die zugehörige Mahlkugel vollständig unabhängig von den übrigen Kraftbeaufschlagungsorganen und Mahlkugeln mit der Mahlkraft beaufschlagt und dementsprechend auch mit einer eigenen Fremdkraftquelle verbunden ist. Bei dieser vorteilhaften Ausgestaltung der Erfindung laufen die Mahlkugeln weitestgehend unabhängig voneinander, so daß eine gegenseitige Beeinflussung im Falle von Störungen wie beispielsweise Fremdkörperüberrollungen fast völlig ausgeschlossen ist.However, it is particularly advantageous if a separate force application member is provided for each pressure device. This means that each force application member applies the grinding force to the associated grinding ball completely independently of the other force application members and grinding balls and is accordingly also connected to its own external power source. In this advantageous embodiment of the invention, the grinding balls run largely independently of one another, so that mutual interference in the event of faults such as rolling over foreign bodies is almost completely ruled out.

Beispielsweise kann jedes Kraftbeaufschlagungsorgan als mit der jeweiligen Andruckeinrichtung verbundener Arm ausgebildet sein, der an einer zentrisch bezüglich der Drehachse der Mühle angeordneten Welle angelenkt ist. Jeder Arm ist dann mit einer eigenen Fremdkraftquelle, beispielsweise einer Federeinrichtung, verbunden und beaufschlagt so die zugehörige Andruckeinrichtung mit der Mahlkraft. Die zentrisch angeordnete Welle selbst dient in diesem Fall nicht mehr als Kraftbeaufschlagungsorgan, sondern lediglich als Widerlager zur Ableitung der Mahlkraft in das Mühlengehäuse.For example, each force application member can be designed as an arm connected to the respective pressing device, which is articulated on a shaft arranged centrally with respect to the axis of rotation of the mill. Each arm is then connected to its own external power source, for example a spring device, and thus applies the grinding force to the associated pressure device. In this case, the centrally arranged shaft itself no longer serves as a force application element, but merely as an abutment for deriving the grinding force into the mill housing.

Es ist auch möglich, jedes Kraftbeaufschlagungsorgan unmittelbar mit dem Mühlengehäuse zu verbinden. Zu diesem Zweck wird beispielsweise jedes Kraftbeaufschlagungsorgan als mit der Fremdkraft beaufschlagter Kniehebel ausgebildet, der an der Andruckeinrichtung und am Mühlengehäuse angelenkt ist. Als Fremdkraftquelle kann beispielsweise jeweils eine zwischen Mühlengehäuse und Kniehebel angeordnete Druckfeder vorgesehen sein. Der Bereich des Mühlengehäuses, in dem die Kniehebel angelenkt sind, in der Regel also der den Mahlraum umgebende Gehäusebereich, muß ausreichend stabil ausgebildet sein, um als Widerlager die Mahlkraft aufnehmen und ableiten zu können.It is also possible to connect each force application member directly to the mill housing. For this purpose, for example, each force application element is designed as a toggle lever which is acted upon by the external force and which is articulated on the pressure device and on the mill housing. For example, a compression spring arranged between the mill housing and the toggle lever can be provided as the external power source. The area of the mill housing in which the toggle levers are articulated, generally the housing area surrounding the grinding chamber, must be designed to be sufficiently stable to be able to absorb and derive the grinding force as an abutment.

Wenn die Andruckeinrichtungen Kugelkalottenflächen als auf die Mahlkugeln wirkende Andruckflächen aufweisen, kommt es beim Mahlvorgang zu einer reibenden Bewegung zwischen den Mahlkugeln und den Andruckeinrichtungen. Damit der durch diese Reibung verursachte Verschleiß von Mahlkugeln und Andruckeinrichtungen gering bleibt, ist zweckmäßigerweise eine diese Reibung vermindernde Schmierung vorgesehen. Als Schmiermittel kann unter Umständen der beim Mahlvorgang entsprechende Staub dienen. Es ist aber vorteilhaft, wenn Schmiereinrichtungen zum Einpressen eines besonderen Schmiermittels zwischen die Berührungsflächen von Kugeln und Andruckeinrichtungen vorgesehen sind. Als Schmiermittel kann beispielsweise Kohle, Wasser, oder eine Kohle-Wasser-Dispersion dienen. Statt Kohle kann auch ein anderer zu mahlender Feststoff als Schmiermittel verwendet werden. Das Einpressen flüssiger Schmiermittel geschieht mittels einer Hochdruckpumpe über eine entsprechende Öffnung in den Andruckeinrichtungen.If the pressure devices have spherical cap surfaces as pressure surfaces acting on the grinding balls, there is a rubbing movement between the grinding balls and the pressure devices during the grinding process. So that the wear caused by this friction of grinding balls and Pressure devices remains low, a lubrication that reduces this friction is expediently provided. Under certain circumstances, the dust corresponding to the grinding process can serve as a lubricant. However, it is advantageous if lubrication devices are provided for injecting a special lubricant between the contact surfaces of balls and pressure devices. For example, coal, water or a coal-water dispersion can serve as a lubricant. Instead of coal, another solid to be ground can also be used as a lubricant. Liquid lubricants are injected by means of a high-pressure pump through a corresponding opening in the pressure devices.

Die Andruckeinrichtungen können im Mahlbetrieb gegenüber dem Mühlengehäuse ortsfest sein. Es ist jedoch auch denkbar, die Andruckeinrichtungen um die Mahlachse drehbar auszubilden. Zu diesem Zweck kann beispielsweise bei den oben beschriebenen Ausführungsformen mit einer zentralen Welle, diese Welle mit Antriebseinrichtungen versehen sein, durch die sie in eine Drehbewegung versetzt werden kann.The pressure devices can be stationary in relation to the mill housing in grinding operation. However, it is also conceivable to design the pressure devices to be rotatable about the grinding axis. For this purpose, for example in the above-described embodiments with a central shaft, this shaft can be provided with drive devices by means of which it can be set into a rotary movement.

Vorstehend sind Ausführungsformen der Erfindung genannt worden, bei denen entweder ein gemeinsames Kraftbeaufschlagungsorgan für alle Andruckeinrichtungen oder aber separate Kraftbeaufschlagungsorgane für jede einzelne Andruckeinrichtung vorgesehen sind. Im Rahmen der Erfindung sind auch Zwischenlösungen denkbar, bei denen jeweils ein Kraftbeaufschlagungsorgan eine Mehrzahl, aber nicht alle separaten Andruckeinrichtungen mit der Mahlkraft beaufschlagt.Embodiments of the invention have been mentioned above, in which either a common force application element for all pressure devices or separate force application elements are provided for each individual pressure device. Intermediate solutions are also conceivable within the scope of the invention, in which one force application member acts on the plurality, but not all, of the separate pressure devices with the grinding force.

Drei Ausführungsbeispiele der Erfindung werden im folgenden anhand der Zeichnung erläutert. Darin zeigen:

Fig. 1
einen schematischen Längsschnitt durch eine erste Ausführungsform der erfindungsgemäßen Kugelringmühle;
Fig. 2
einen schematischen Längsschnitt durch eine zweite Ausführungsform;
Fig. 3
einen schematischen Längsschnitt durch eine dritte Ausführungsform der Erfindung.
Three embodiments of the invention are explained below with reference to the drawing. In it show:
Fig. 1
a schematic longitudinal section through a first embodiment of the ball ring mill according to the invention;
Fig. 2
a schematic longitudinal section through a second embodiment;
Fig. 3
a schematic longitudinal section through a third embodiment of the invention.

In dem Fundament 1 der Kugelringmühle ist ein Getriebe 2 angeordnet, dem über die Kupplung 3 Antriebsleistung zugeführt wird. Das Getriebe 2 weist eine vertikale Abtriebsnabe 4 auf, die in dem Getriebe 2 in einem Axialdrucklager gelagert ist, das den Mahldruck aufnimmt. Diese Nabe 4 ist einstückig mit einer Drehscheibe 5 verbunden, auf der der untere Mahlring 6 gelagert und mit ihr drehfest verbunden ist. Auf dem unteren Mahlring 6 rollen Mahlkugeln 7 ab, die jeweils von einer separaten Andruckeinrichtung 8 gegen den unteren Mahlring 6 gedrückt werden. Die Andruckeinrichtungen 8 weisen als Andruckfläche für die Mahlkugeln 7 eine dem unteren Mahlring 6 zugewandte Kugelkalottenfläche auf. An jede Andruckeinrichtung 8 ist ein Kniehebel 9 angelenkt, der bei 10 wiederum an das Mühlengehäuse angelenkt ist. Er wird von einer Druckfeder 11, die sich am Mühlengehäuse abstützt, federbeaufschlagt. Jede Mahlkugel 7 wird jeweils von einer separaten Andruckeinrichtung 8, Kniehebel 9 und Druckfeder 11 mit der Mahlkraft beaufschlagt. Zur Schmierung der Berührungsflächen zwischen Kugeln 7 und Andruckeinrichtungen 8 können in der Zeichnung nicht dargestellte Einrichtungen vorgesehen sein, die Schmiermittel zwischen diese Berührungsflächen einpressen. Es kann auch vorgesehen sein, daß sich die Druckfedern 11 nicht unmittelbar am Mühlengehäuse, sondern an einer in der Zeichnung nicht dargestellten Hydraulikeinrichtung abstützen, mittels der die Federvorspannung und damit die Mahlkraft verstellbar ist.A gear 2 is arranged in the foundation 1 of the ball ring mill, to which drive power is supplied via the clutch 3. The transmission 2 has a vertical output hub 4, which is mounted in the transmission 2 in an axial pressure bearing, which receives the grinding pressure. This hub 4 is integrally connected to a turntable 5 on which the lower grinding ring 6 is mounted and connected to it in a rotationally fixed manner. Rolling balls 7 roll on the lower grinding ring 6, each of which is pressed against the lower grinding ring 6 by a separate pressure device 8. The pressure devices 8 have a spherical cap surface facing the lower grinding ring 6 as the pressure surface for the grinding balls 7. A toggle lever 9 is articulated to each pressure device 8, which in turn is articulated at 10 to the mill housing. It is spring-loaded by a compression spring 11, which is supported on the mill housing. Each grinding ball 7 is acted upon by the grinding force by a separate pressure device 8, toggle lever 9 and compression spring 11. To lubricate the contact surfaces between balls 7 and pressure devices 8, devices (not shown) can be provided in the drawing which press lubricant between these contact surfaces. It can also be provided that the compression springs 11 are not supported directly on the mill housing, but on a hydraulic device, not shown in the drawing, by means of which the spring preload and thus the grinding force can be adjusted.

Beim Betrieb der Mühle wird Mahlgut über eine mit einem Tellerspeiser 12 versehene Aufgabe 13 und durch einen Stutzen 14 dem Mahlraum 15 zugeführt. Das ungefähr mittig in den Mahlraum 15 aufgegebene Mahlgut wird zwischen dem unteren Mahlring 6 und den Mahlkugeln 7 zermahlen und aufgrund der Zentrifugalwirkung des sich drehenden unteren Mahlrings 6 nach außen getragen. Der untere Mahlring 6 ist von einem Ringraum 16 umgeben, der über einen Stutzen 17 mit Luft gespeist wird. Die Luft wird mit großer Geschwindigkeit durch einen Ringspalt 18 nach oben geblasen und nimmt dabei das gemahlene Gut mit zum Windsichter 19. Das Mahlgut wird an den Regelklappen 20 vorbei in den Trichter 21 des Windsichters geführt. Ausreichend feingemahlenes Mahlgut wird mit der ausströmenden Luft durch den Stutzen 22 abgeführt. Das nicht genügend zerkleinerte Gut fällt als Sichtgrobes durch das Rückführungsrohr 23 in den Mahlraum 16 zurück. Die gewünschte Mahlfeinheit läßt sich durch Verstellen der Regelklappen 20 einstellen. Wenn im Betrieb der Mühle der Lauf einer Mahlkugel 7 beispielsweise durch Fremdkörperüberrollung gestört wird, wird der Lauf der übrigen Mahlkugeln 7 durch diese Störung nicht beeinflußt. Es werden daher weder durch die Femdkörperüberrollung auftretende Kräfte auf die übrigen Mahlkugeln übertragen noch findet eine gegenseitige Beeinflussung im Sinne einer unerwünschten Schwingungsanregung statt.When the mill is operating, regrind is fed to the grinding chamber 15 via a task 13 provided with a plate feeder 12 and through a nozzle 14. The ground material, which is introduced approximately in the center of the grinding chamber 15, is ground between the lower grinding ring 6 and the grinding balls 7 and, due to the centrifugal effect of the rotating lower grinding ring 6, is carried outwards. The lower grinding ring 6 is surrounded by an annular space 16 which is fed with air via a nozzle 17. The air is blown upwards at high speed through an annular gap 18 and takes the ground material with it to the air classifier 19. The ground material is guided past the control flaps 20 into the funnel 21 of the air classifier. Sufficiently ground ground material is discharged through the nozzle 22 with the outflowing air. The material that has not been comminuted sufficiently falls back into the grinding chamber 16 as a visible coarse material through the return pipe 23. The desired fineness can be adjusted by adjusting the control flaps 20. If, during operation of the mill, the run of a grinding ball 7 is disturbed, for example, by rolling over foreign bodies, the running of the remaining grinding balls 7 is not affected by this disturbance. It will therefore, neither forces occurring due to the foreign body rollover are transferred to the other grinding balls, nor is there any mutual interference in the sense of undesirable vibration excitation.

Bei der in Fig. 2 gezeigten Ausführungsform der erfindungsgemäßen Kugelringmühle dient als Widerlager für die Mahlkraft nicht unmittelbar das Mühlengehäuse, es ist vielmehr eine zentrisch bezüglich der Drehachse der Mühle angeordnete zusätzliche Welle 24 vorgesehen, die in dem Getriebe 2 so gelagert ist, daß sie Zugkräfte aufnehmen kann. Die Welle 24 ist gegenüber der Nabe 4, dem Drehteller 5 und dem unteren Mahlring 6 frei verdrehbar, sie kann ggf. eine eigene Antriebseinrichtung aufweisen. Unter Umständen kann die Welle 24 auch ortsfest bezüglich des Mühlengehäuses angeordnet sein. In keinem Fall ist sie jedoch drehfest mit der Nabe 4, dem Drehteller 5 und dem unteren Mahlring 6 verbunden.In the embodiment of the ball ring mill according to the invention shown in FIG. 2, the mill housing does not directly serve as an abutment for the grinding force, rather an additional shaft 24 is provided which is arranged centrally with respect to the axis of rotation of the mill and is mounted in the gear 2 so that it has tensile forces can record. The shaft 24 can be freely rotated relative to the hub 4, the turntable 5 and the lower grinding ring 6, and it can optionally have its own drive device. Under certain circumstances, the shaft 24 can also be arranged in a stationary manner with respect to the mill housing. In no case is it non-rotatably connected to the hub 4, the turntable 5 and the lower grinding ring 6.

An der Spitze der Welle 24 sind bei 25 Arme oder Hebel 26 angelenkt, die jeweils bei 27 an eine Andruckeinrichtung 8 angelenkt sind. Jeder Hebel 26 ist mittels einer zwischen diesem Hebel und der Welle 24 angeordneten Zugfeder 28 federbeaufschlagt, er überträgt diese Federkraft auf die zugehörige Andruckeinrichtung 8 und damit auf die jeweilige Mahlkugel 7.Arms or levers 26 are articulated at 25 at the tip of the shaft 24, each of which is articulated at 27 to a pressure device 8. Each lever 26 is spring-loaded by means of a tension spring 28 arranged between this lever and the shaft 24, it transmits this spring force to the associated pressure device 8 and thus to the respective grinding ball 7.

Fig. 3 zeigt eine dritte Ausführungsform der Erfindung. Bei dieser Mühle ist eine zentrisch bezüglich ihrer Drehachse angeordnete Welle 29 vorgesehen, die ebenso wie die Welle 24 der in Fig. 2 gezeigten Ausführungsform frei gegenüber der Nabe 4, dem Drehteller 5 und dem unteren Mahlring 6 verdrehbar ist. Sie kann ebenfalls angetrieben oder ggf. auch ortsfest gegenüber dem Mühlengehäuse sein. Die Welle 29 dient hier aber nicht als Widerlager zur Aufnahme der Mahlkraft, sondern als eigentliches Kraftbeaufschlagungsorgan, sie wird im Getriebe 2 von einer nicht gezeigten Einrichtung (beispielsweise einer Feder- oder Hydraulikeinrichtung) mit der Fremdkraft bzw. Mahlkraft beaufschlagt. Die Welle 29 ist starr mit Armen 30 verbunden, die jeweils zu den Andruckeinrichtungen 8 führen und diese so mit der Mahlkraft beaufschlagen. Die Welle 29 wird also mit der gesamten Mahlkraft für sämtliche Mahlkugeln beaufschlagt, diese Mahlkraft wird über die Arme 30 auf die jeweiligen Andruckeinrichtungen 8 und damit auf die Mahlkugeln 7 verteilt.3 shows a third embodiment of the invention. In this mill, a shaft 29 is provided which is arranged centrally with respect to its axis of rotation and which, like the shaft 24 of the embodiment shown in FIG. It can also be driven or possibly also stationary with respect to the mill housing. Here, however, the shaft 29 does not serve as an abutment for absorbing the grinding force, but rather as the actual force application element; it is acted upon in the transmission 2 by a device (not shown) (for example a spring or hydraulic device) with the external force or grinding force. The shaft 29 is rigidly connected to arms 30, which each lead to the pressure devices 8 and thus apply the grinding force to them. The shaft 29 is thus subjected to the entire grinding force for all grinding balls; this grinding force is distributed via the arms 30 to the respective pressure devices 8 and thus to the grinding balls 7.

Claims (9)

Kugelringmühle mit einem Mühlengehäuse, einer Mahlbahn (6) und Mahlkugeln (7), die von einer Fremdkraft beaufschlagt auf der Mahlbahn (6) ablaufen, dadurch gekennzeichnet, daß für jede Mahlkugel (7) eine separate Andruckeinrichtung (8) zum Übertragen der Fremdkraft auf die Mahlkugel (7) vorgesehen ist.Ball ring mill with a mill housing, a grinding track (6) and grinding balls (7), which are acted upon by an external force and run on the grinding track (6), characterized in that for each grinding ball (7) there is a separate pressure device (8) for transmitting the external force the grinding ball (7) is provided. Kugelringmühle nach Anspruch 1, dadurch gekennzeichnet, daß jede Andruckeinrichtung (8) eine Kugelkalottenfläche als auf die Mahlkugel (7) wirkende Andruckfläche aufweist.Ball ring mill according to claim 1, characterized in that each pressure device (8) has a spherical cap surface as a pressure surface acting on the grinding ball (7). Kugelringmühle nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß jede Andruckeinrichtung (8) mit einem gemeinsamen Kraftbeaufschlagungsorgan (29) verbunden ist.Ball ring mill according to claim 1 or 2, characterized in that each pressure device (8) is connected to a common force application member (29). Kugelringmühle nach Anspruch 3, dadurch gekennzeichnet, daß das gemeinsame Kraftbeaufschlagungsorgan als mit der Fremdkraft beaufschlagte, zentrisch bezüglich der Drehachse der Mühle angeordnete Welle (29) ausgebildet ist.Ball ring mill according to Claim 3, characterized in that the common force application element is designed as a shaft (29) which is acted on by the external force and is arranged centrally with respect to the axis of rotation of the mill. Kugelringmühle nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß für jede Andruckeinrichtung (8) ein separates Kraftbeaufschlagungsorgan (9, 26) vorgesehen ist.Ball ring mill according to claim 1 or 2, characterized in that a separate force application member (9, 26) is provided for each pressure device (8). Kugelringmühle nach Anspruch 5, dadurch gekennzeichnet, daß jedes Kraftbeaufschlagungsorgan (26) an einer zentrisch bezüglich der Drehachse der Mühle angeordneten Welle 24 angelenkt ist.Ball ring mill according to claim 5, characterized in that each force application member (26) is articulated on a shaft 24 arranged centrally with respect to the axis of rotation of the mill. Kugelringmühle nach Anspruch 5, dadurch gekennzeichnet, daß jedes Kraftbeaufschlagungsorgan (9) unmittelbar mit dem Mühlengehäuse verbunden ist.Ball ring mill according to claim 5, characterized in that each force application member (9) is connected directly to the mill housing. Kugelringmühle nach Anspruch 7, dadurch gekennzeichnet, daß jedes Kraftbeaufschlagungsorgan als mit der Fremdkraft beaufschlagter Kniehebel (9) ausgebildet ist, der an der Andruckeinrichtung (8) und am Mühlengehäuse angelenkt ist.Ball ring mill according to claim 7, characterized in that each force application member is designed as a toggle lever (9) acted upon by the external force, which is articulated on the pressure device (8) and on the mill housing. Kugelringmühle nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß Schmiereinrichtungen zum Einpressen von Schmiermittel zwischen die Berührungsflächen von Kugeln (7) und Andruckeinrichtungen (8) vorgesehen sind.Ball ring mill according to one of claims 1 to 8, characterized in that lubrication devices are provided for injecting lubricant between the contact surfaces of balls (7) and pressure devices (8).
EP95105381A 1994-04-13 1995-04-10 Ring ball mill Withdrawn EP0677329A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9406144U 1994-04-13
DE9406144U DE9406144U1 (en) 1994-04-13 1994-04-13 Ball ring mill

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107051681A (en) * 2017-05-28 2017-08-18 宋双燕 A kind of efficient Chinese medicine lapping device
CN108161015A (en) * 2016-08-25 2018-06-15 梁怡芃 A kind of reducing mechanism
CN109622577A (en) * 2019-02-01 2019-04-16 南昌见诚科技有限公司 A kind of electronic product that security performance is high recycling crushing plant

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Publication number Priority date Publication date Assignee Title
US1332850A (en) * 1916-10-10 1920-03-02 Kutsche Oswald Comminuting apparatus
DE499699C (en) * 1926-10-23 1930-06-11 Hermann Hildebrandt Grinding device with grinding bodies pressed against a grinding track
US2253819A (en) * 1938-04-26 1941-08-26 Harold V Spaulding Ring and ball mill
FR2299912A1 (en) * 1975-02-07 1976-09-03 Fives Cail Babcock IMPROVEMENTS IN SLUDGE TREATMENT FOR THE PRODUCTION OF FINE-PARTICLE MATERIALS
DE2918195A1 (en) * 1979-05-05 1980-11-06 Peters Ag Claudius Ball grinder or crusher - has central power cylinder acting on lower grinding unit to produce grinding pressure on balls

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1332850A (en) * 1916-10-10 1920-03-02 Kutsche Oswald Comminuting apparatus
DE499699C (en) * 1926-10-23 1930-06-11 Hermann Hildebrandt Grinding device with grinding bodies pressed against a grinding track
US2253819A (en) * 1938-04-26 1941-08-26 Harold V Spaulding Ring and ball mill
FR2299912A1 (en) * 1975-02-07 1976-09-03 Fives Cail Babcock IMPROVEMENTS IN SLUDGE TREATMENT FOR THE PRODUCTION OF FINE-PARTICLE MATERIALS
DE2918195A1 (en) * 1979-05-05 1980-11-06 Peters Ag Claudius Ball grinder or crusher - has central power cylinder acting on lower grinding unit to produce grinding pressure on balls

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108161015A (en) * 2016-08-25 2018-06-15 梁怡芃 A kind of reducing mechanism
CN107051681A (en) * 2017-05-28 2017-08-18 宋双燕 A kind of efficient Chinese medicine lapping device
CN109622577A (en) * 2019-02-01 2019-04-16 南昌见诚科技有限公司 A kind of electronic product that security performance is high recycling crushing plant
CN109622577B (en) * 2019-02-01 2023-06-16 南昌见诚科技有限公司 Electronic product recovery crushing equipment with high safety performance

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DE9406144U1 (en) 1995-08-10
PL308077A1 (en) 1995-10-16
PL176560B1 (en) 1999-06-30
FI951754A (en) 1995-10-14
FI951754A0 (en) 1995-04-12

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