EP0179048B1 - Ball mill - Google Patents

Ball mill Download PDF

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Publication number
EP0179048B1
EP0179048B1 EP19850890253 EP85890253A EP0179048B1 EP 0179048 B1 EP0179048 B1 EP 0179048B1 EP 19850890253 EP19850890253 EP 19850890253 EP 85890253 A EP85890253 A EP 85890253A EP 0179048 B1 EP0179048 B1 EP 0179048B1
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Prior art keywords
balls
grooves
radius
section
cross
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EP19850890253
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German (de)
French (fr)
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EP0179048A2 (en
EP0179048A3 (en
Inventor
Erich Pichlmaier
Manfred Zoller
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Voestalpine AG
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Voestalpine AG
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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
    • B02C17/00Disintegrating 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
    • B02C17/18Details
    • B02C17/22Lining for containers

Definitions

  • a ball mill in which the inner lining has approximately circumferential grooves with a circular segment-shaped cross section is known, for example, from AT-PS 283 092.
  • the distance between the adjacent grooves is smaller than the diameter of the largest ball.
  • the ground material is ground in the grooves and the number of these grooves is limited by the axial extension of the ball mill.
  • the grinding balls wear out during operation, which reduces their radius. At certain intervals, some of the worn balls are removed and replaced with new balls. In operation, the balls in the pile of balls automatically arrange themselves so that the larger, new ones are at the bottom and interact with the grooves. Since the balls to be removed are taken from above, the smaller, worn balls are replaced. The radius of the largest grinding balls is therefore to be understood as the radius of such an exchanged new grinding ball.
  • the balls in the grooves adjust so that the balls run at distances from one another in the grooves. Such a distance promotes the penetration of new regrind into the grooves, and this improves the grinding effect.
  • the design is such that the center distance of the adjacent grooves from one another is equal to the radius of the largest grinding ball multiplied by / 3-. The result of this is that the balls adjust themselves in the grooves in such a way that the balls in each groove lie close together in a row.
  • the balls are arranged like a honeycomb, and in this case the densest ball position results.
  • the radius of the rounding, via which the flanks of the webs merge in cross section is preferably 0.15 to 0.17 of the radius of the groove cross section.
  • Such a dimensioning of the rounding is sufficient to counteract a destruction of the web between adjacent grooves.
  • a rounding off with a larger radius would be effective Reduce seed groove cross-section, and a too large reduction in the groove cross-section is disadvantageous for the grinding effect, since the grinding takes place between the grooves and the balls.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Bearings For Parts Moving Linearly (AREA)
  • Milling Processes (AREA)

Description

Die Erfindung bezieht sich auf eine rotierbare Kugelmühle mit einer Innenauskleidung, welche ungefähr in Umfangsrichtung parallel zueinander verlaufende Rillen aufweist und innerhalb welcher Mahlkugeln angerodnet sind, wobei die benachbarten Rillen durch ungefähr in Umfangsrichtung verlaufende Stege gegeneinander abgegrenzt sind. Hiebei können die ungefähr in Umfangsrichtung verlaufenden Rillen in senkrecht zur Rotationsachse stehenden Ebenen angeordnet sein oder sie können auch schraubenlinienförmig verlaufen. Bei solchen Kugelmühlen besteht die Innenauskleidung üblicherweise aus in die zylindrische Wandung eingesetzten Panzerplatten. Die Mahlung des in die Kugelmühle eingebrachten Mahlgutes erfolgt im Kugelhaufen zwischen den einzelnen Kugeln und zwischen der jeweils äusseren Kugelschicht und der Innenauskleidung. Es gibt Kugelmühlen mit glatter Innenauskleidung, wobei die Berührung zwischen der Innenauskleidung und den Kugeln eine Punktberührung ist, so dass der Mahleffekt zwischen Kugeln und Innenauskleidung verhältnismässig gering ist. Die herabfallenden Kugeln schlagen auf die nackte Innenauskleidung auf, wodurch einerseits ein grosser Verschleiss und andererseits eine starke Lärmentwicklung entsteht. Eine Kugelmühle, bei welcher die Innenauskleidung ungefähr in Umfangsrichtung verlaufende Rillen mit kreissegmentförmigem Querschnitt aufweist, ist beispielsweise aus der AT-PS 283 092 bekannt. Bei einer anderen bekannten Ausbildung (FR-A 2 476 503) ist der Abstand der benachbarten Rillen voneinander kleiner dem Durchmesser der grössten Kugel. Die Mahlung des Mahlgutes erfolgt in den Rillen, und die Anzahl dieser Rillen ist durch die axiale Erstreckung der Kugelmühle beschränkt.The invention relates to a rotatable ball mill with an inner lining which has grooves running approximately parallel to one another in the circumferential direction and within which grinding balls are arranged, the adjacent grooves being delimited from one another by webs running approximately in the circumferential direction. The grooves running approximately in the circumferential direction can be arranged in planes perpendicular to the axis of rotation or they can also run helically. In such ball mills, the inner lining usually consists of armor plates inserted into the cylindrical wall. The grinding material introduced into the ball mill is ground in the ball pile between the individual balls and between the respective outer ball layer and the inner lining. There are ball mills with a smooth inner lining, the contact between the inner lining and the balls being a point contact, so that the grinding effect between the balls and the inner lining is relatively small. The falling balls hit the bare inner lining, which on the one hand creates a lot of wear and on the other hand creates a lot of noise. A ball mill in which the inner lining has approximately circumferential grooves with a circular segment-shaped cross section is known, for example, from AT-PS 283 092. In another known design (FR-A 2 476 503), the distance between the adjacent grooves is smaller than the diameter of the largest ball. The ground material is ground in the grooves and the number of these grooves is limited by the axial extension of the ball mill.

Zwischen den benachbarten Rillen verbleibt ein Steg und dadurch, dass die Mittelabstände der benachbarten Rillen kleiner sind als der Durchmesser der grössten Mahlkugeln, verschmälert sich der Steg zwischen den benachbarten Rillen. Die Rillen überschneiden einander und es würde der Steg zu einem schmalen oder sogar scharfen Grat verkleinert werden. Ein solcher schmaler oder sogar scharfer Grat würde aber durch die herabfallenden Kugeln zersplittert werden. Solche Splitter würden sowohl den Verschleiss der Innenauskleidung als auch den Verschleiss der Kugeln erhöhen und überdies würde durch die Zerstörung der Grate und durch die Vermahlung der Stahlsplitter ein zusätzlicher Energieaufwand entstehen.A web remains between the adjacent grooves and because the center distances of the adjacent grooves are smaller than the diameter of the largest grinding balls, the web between the adjacent grooves narrows. The grooves overlap and the web would be reduced to a narrow or even sharp ridge. Such a narrow or even sharp ridge would be shattered by the falling balls. Such splinters would increase both the wear on the inner lining and the wear on the balls and, moreover, the destruction of the ridges and the grinding of the steel splinters would result in additional energy expenditure.

Der Erfindung liegt die Aufgabe zugrunde, die vorher beschriebenen Nachteile zu vermeiden und die Erfindung besteht darin, dass bei im Querschnitt kreissegmentförmigen Rillen im Querschnitt durch die Stege die Flanken derselben über eine Abrundung ineinander übergehen. Da die Mlttelabstände der benachbarten Rillen voneinander kleiner sind als der Durchmesser der grössten Mahlkugel, können bei gleicher axialer Erstreckung der Kugelmühle mehr Rillen in der Innenauskleidung untergebracht werden. Die Kugeln stellen sich so ein, dass sie in den benachbarten Rillen gegeneinander versetzt liegen, so dass eine grössere Anzahl von Kugeln die Mahlung zwischen Kugeln und Innenauskleidung bewirkt. Dadurch aber, dass im Querschnitt durch die Stege die Flanken derselben über eine Abrundung ineinander übergehen, wird eine Zerstörung und Zersplitterung der Stege weitgehend vermieden und es wird dadurch der Verschleiss der Innenauskleidung und der Kugeln herabgesetzt.The invention is based on the object of avoiding the disadvantages described above and the invention consists in that in the case of grooves which are circular segment-shaped in cross-section, the flanks of the cross-sections merge into one another via a rounding. Since the spacing between the adjacent grooves is smaller than the diameter of the largest grinding ball, more grooves can be accommodated in the inner lining with the same axial extension of the ball mill. The balls adjust so that they are offset from each other in the adjacent grooves, so that a larger number of balls causes grinding between the balls and the inner lining. However, the fact that in cross-section through the webs the flanks of these merge into one another via a rounding-off, destruction and fragmentation of the webs is largely avoided and wear on the inner lining and the balls is thereby reduced.

Die Mahlkugeln nützen sich im Laufe des Betriebes ab, wodurch sich ihr Radius verringert. Es wird daher in gewissen Zeitabständen ein Teil der abgenützten Kugeln entfernt und durch neue Kugeln ersetzt. Im Betrieb ordnen sich die Kugeln im Kugelhaufen automatisch so, dass die grösseren neuen unten liegen und mit den Rillen zusammenwirken. Da die zu entfernenden Kugeln von oben genommen werden, werden somit jeweils die kleineren, abgenützten Kugeln ausgetauscht. Unter dem Radius der grössten Mahlkugeln ist daher der Radius einer solchen ausgetauschten neuen Mahlkugel zu verstehen.The grinding balls wear out during operation, which reduces their radius. At certain intervals, some of the worn balls are removed and replaced with new balls. In operation, the balls in the pile of balls automatically arrange themselves so that the larger, new ones are at the bottom and interact with the grooves. Since the balls to be removed are taken from above, the smaller, worn balls are replaced. The radius of the largest grinding balls is therefore to be understood as the radius of such an exchanged new grinding ball.

Wenn die Mittelabstände zwischen den benachbarten Rillen nur geringfügig verkleinert werden, so stellen sich die Kugeln in den Rillen so ein, dass in den Rillen die Kugeln in Abständen voneinander laufen. Durch einen solchen Abstand wird das Eindringen von neuem Mahlgut in die Rillen begünstigt, und dies verbessert den Mahleffekt. Gemäss einer bevorzugten Ausführungsform der Erfindung ist jedoch die Bemessung so getroffen, dass der Mittelabstand der benachbarten Rillen voneinander gleich dem Radius der grössten Mahlkugel multipliziert mit /3-ist. Dadurch wird erreicht, dass die Kugeln sich in den Rillen so einstellen, dass die Kugeln in jeder Rille in einer Reihe dicht aneinander liegen. Die Kugeln ordnen sich binenwabenartig an, und es ergibt sich in diesem Fall die dichteste Kugellage. Bei einer solchen bienenwabe lartigen Anordnung der Kugeln liegen die Mittelpunkte der Kugeln in den benachbarten Rillen um 30° gegeneinander versetzt. Der Mittelabstand a der Rillen beträgt 2 x R x cos 30°, wobei unter R der Kugelradius zu verstehen ist, und diese Formel lautet vereinfacht

Figure imgb0001
. Da bei einer solchen Anordnung die Kugeln der in einer Rille liegenden Kugelreihe einander berühren und der Mittelabstand zwischen den benachbarten Rillen verringert ist, kann bei gleicher axialer Erstreckung der Kugelmühle eine grössere Anzahl von Kugeln mit der Innenauskleidung zusammenwirken, und es wird daher ein optimaler Mahleffekt erreicht.If the center distances between the adjacent grooves are only slightly reduced, the balls in the grooves adjust so that the balls run at distances from one another in the grooves. Such a distance promotes the penetration of new regrind into the grooves, and this improves the grinding effect. According to a preferred embodiment of the invention, however, the design is such that the center distance of the adjacent grooves from one another is equal to the radius of the largest grinding ball multiplied by / 3-. The result of this is that the balls adjust themselves in the grooves in such a way that the balls in each groove lie close together in a row. The balls are arranged like a honeycomb, and in this case the densest ball position results. In such a honeycomb l-like arrangement of the balls, the centers of the balls are offset from one another in the adjacent grooves by 30 °. The center distance a of the grooves is 2 x R x cos 30 °, where R is the sphere radius, and this formula is simplified
Figure imgb0001
. With such an arrangement, since the balls of the row of balls lying in a groove touch each other and the center distance between the adjacent grooves is reduced, a larger number of balls can interact with the inner lining with the same axial extent of the ball mill, and therefore an optimal grinding effect is achieved .

Gemäss der Erfindung beträgt vorzugsweise der Radius der Abrundung, über welche die Flanken der Stege im Querschnitt ineinander übergehen, 0,15 bis 0,17 des Radius des Rillenquerschnittes. Eine solche Bemessung der Abrundung genügt, um einer Zerstörung des Steges zwischen benachbarten Rillen entgegenzuwirken. Eine Abrundung mit grösserem Radius würde den wirksamen Rillenquerschnitt verringern, und eine zu grosse Verringerung des Rillenquerschnittes ist für den Mahleffekt nachteilig, da die Mahlung zwischen den Rillen und den Kugeln erfolgt. Bei der erfindungsgemässen Bemessung der Abrundung der Stege bleibt noch immer eine für einen guten Mahleffekt ausreichende Tiefe der Rille aufrechterhalten.According to the invention, the radius of the rounding, via which the flanks of the webs merge in cross section, is preferably 0.15 to 0.17 of the radius of the groove cross section. Such a dimensioning of the rounding is sufficient to counteract a destruction of the web between adjacent grooves. A rounding off with a larger radius would be effective Reduce seed groove cross-section, and a too large reduction in the groove cross-section is disadvantageous for the grinding effect, since the grinding takes place between the grooves and the balls. When dimensioning the rounding of the webs according to the invention, a depth of the groove sufficient for a good grinding effect is still maintained.

In der Zeichnung ist die Erfindung an Hand eines Ausführungsbeispieles schematisch erläutert. Fig. 1 zeigt einen Querschnitt durch die zwei benachbarten Rillen mit in den Rillen laufenden Kugeln. Fig. 2 zeigt ein Element der die Innenauskleidung bildenden Panzerplatten und die Anordnung der in den Rillen laufenden Kugeln in Draufsicht.In the drawing, the invention is explained schematically using an exemplary embodiment. Fig. 1 shows a cross section through the two adjacent grooves with balls running in the grooves. Fig. 2 shows an element of the armor plates forming the inner lining and the arrangement of the balls running in the grooves in plan view.

Die aus Panzerplatten bestehende Innenauskleidung ist mit 1 bezeichnet. Diese Innenauskleidung weist in Umfangsrichtung verlaufende Rillen 2 auf, in welchen Mahlkugeln 3 laufen: Der Mittelabstand zwischen den benachbarten Rillen 2 ist mit a bezeichnet. Dieser Mittelabstand a ist kleiner als der Durchmesser b der Kugeln. Fig. 1 zeigt, dass die Kugeln 3 gegeneinander versetzt in den benachbarten Rillen 2 laufen. Dadurch, dass der Mittelabstand zwischen den Rillen 2 kleiner gewählt wird, ergibt sich zwischen den Rillen ein schmälerer Steg 4. Die Flanken 5 dieses Steges gehen über eine Abrundung 6 ineinander über. Der Radius dieser Abrundung ist mit 7 bezeichnet. Der Radius 7 dieser Abrundung beträgt 0,15 bis 0,17 des Radius c des Querschnittes der Rillen 2.The inner lining consisting of armor plates is designated by 1. This inner lining has grooves 2 running in the circumferential direction, in which grinding balls 3 run: the center distance between the adjacent grooves 2 is denoted by a. This center distance a is smaller than the diameter b of the balls. Fig. 1 shows that the balls 3 run offset in the adjacent grooves 2. Because the center distance between the grooves 2 is chosen to be smaller, there is a narrower web 4 between the grooves. The flanks 5 of this web merge into one another via a rounding 6. The radius of this rounding is designated by 7. The radius 7 of this rounding is 0.15 to 0.17 of the radius c of the cross section of the grooves 2.

In Fig. 2 ist die dichteste Lage der Kugeln in den Rillen dargestellt. Diese dichteste Lage ist bienenwabenartig, wobei die Verbindungslinien 9 zwischen den Mittelpunkten 8a und 8b der Kugeln 3 unter einem Winkel a von 30° zur Erzeugenden 10 des durch die Innenauskleidung gebildeten Zylinders stehen.2 shows the closest position of the balls in the grooves. This densest layer is honeycomb-like, the connecting lines 9 between the centers 8a and 8b of the balls 3 being at an angle a of 30 ° to the generatrix 10 of the cylinder formed by the inner lining.

Daraus ergibt sich der Abstand a zwischen den Mittellinien 11 a und 11 b mit

Figure imgb0002
wobei R den Radius der Kugeln bezeichnet.This results in the distance a between the center lines 11 a and 11 b
Figure imgb0002
where R denotes the radius of the balls.

Dies ist die Formel für die dichteste Kugellage. Bei dieser Bemessung des Mittelabstandes a der benachbarten Rillen ist somit die Anzahl der Kugeln, welche die Mahlung an der Innenauskleidung bewirken, am grössten und somit der Mahleffekt am besten.This is the formula for the densest ball position. With this dimensioning of the center distance a of the adjacent grooves, the number of balls which cause the grinding on the inner lining is the greatest and thus the grinding effect is the best.

Claims (3)

1. Rotary, cylindrical ball mill with an inner lining (1), which has approximately circomferential- ly parallel grooves (2) and within which are arranged grinding balls (3), the adjacent grooves (2) being reciprocally bounded by approximately circumferentially directed webs (3) and the centre distances (a) between the adjacent grooves (2) are smaller than the diameter (b) of the largest grinding ball (3), characterized in that the grooves (2) have a circular segmental cross-section and that in cross-section through the webs (4) the flanks (5) thereof pass into one another via a rounded portion (6).
2. Ball mill according to claim 1, characterized in that the centre distance (a) of the adjacent grooves (2) from one another is the same as the radius (b) of the largest grinding ball (3) multi- plied by
Figure imgb0003
3. Ball mill according to claims 1 or 2, characterized in that the radius (7) of the rounded portion (6), via which the flanks (5) of webs (4) in cross-section pass into one another is 0.15 to 0.17 the radius (c) of the groove cross-section.
EP19850890253 1984-10-15 1985-10-09 Ball mill Expired EP0179048B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT3288/84 1984-10-15
AT328884A AT380411B (en) 1984-10-15 1984-10-15 BALL MILL

Publications (3)

Publication Number Publication Date
EP0179048A2 EP0179048A2 (en) 1986-04-23
EP0179048A3 EP0179048A3 (en) 1987-01-28
EP0179048B1 true EP0179048B1 (en) 1988-12-07

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ID=3548244

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Application Number Title Priority Date Filing Date
EP19850890253 Expired EP0179048B1 (en) 1984-10-15 1985-10-09 Ball mill

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EP (1) EP0179048B1 (en)
JP (1) JPS6197049A (en)
AT (1) AT380411B (en)
BR (1) BR8505088A (en)
DE (1) DE3566621D1 (en)
ES (1) ES8608930A1 (en)
IN (1) IN163326B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATA108786A (en) * 1986-04-23 1989-07-15 Voest Alpine Ag BALL TUBE MILL
AT393234B (en) * 1987-08-20 1991-09-10 Boehler Gmbh GRINDING METHOD FOR BALL TUBE MILLS, BALL TUBE MILLS AND GRINDING PLATE
DD298601A5 (en) * 1989-09-15 1992-03-05 Forschungsinstitut Fuer Aufbereitung,De INTERIOR CLADDING FOR TUBE BALL MILLS
CN100384537C (en) * 2006-05-12 2008-04-30 刘旭 Mill lining plate

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1052215B (en) * 1954-09-29 1959-03-05 Walther Hiller Dipl Ing Armored plate for pipe mills
AT283092B (en) * 1965-04-08 1970-07-27 Boehler & Co Ag Geb Inner lining of ball mills
DD154425A3 (en) * 1980-02-22 1982-03-24 Paul Clemens INTERIOR CLADDING OF TUBE BALL MILLS

Also Published As

Publication number Publication date
ES547831A0 (en) 1986-09-01
IN163326B (en) 1988-09-10
JPS6197049A (en) 1986-05-15
DE3566621D1 (en) 1989-01-12
ATA328884A (en) 1985-10-15
ES8608930A1 (en) 1986-09-01
EP0179048A2 (en) 1986-04-23
BR8505088A (en) 1986-07-29
AT380411B (en) 1986-05-26
EP0179048A3 (en) 1987-01-28

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