EP0179047A2 - Ball mill - Google Patents

Ball mill Download PDF

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Publication number
EP0179047A2
EP0179047A2 EP85890252A EP85890252A EP0179047A2 EP 0179047 A2 EP0179047 A2 EP 0179047A2 EP 85890252 A EP85890252 A EP 85890252A EP 85890252 A EP85890252 A EP 85890252A EP 0179047 A2 EP0179047 A2 EP 0179047A2
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EP
European Patent Office
Prior art keywords
radius
ball
balls
grinding
section
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Withdrawn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
EP85890252A
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German (de)
French (fr)
Other versions
EP0179047A3 (en
Inventor
Erich Pichlmaier
Manfred Zoller
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.)
Voestalpine AG
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Voestalpine AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voestalpine AG filed Critical Voestalpine AG
Publication of EP0179047A2 publication Critical patent/EP0179047A2/en
Publication of EP0179047A3 publication Critical patent/EP0179047A3/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/22—Lining for containers

Definitions

  • the invention relates to a rotatable, cylindrical ball mill with an inner lining, which has approximately circumferential grooves with a circular segment-shaped cross section and within which grinding balls are arranged.
  • 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.
  • 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 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 balls and inner lining is relatively small.
  • 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 circular segment-shaped cross section of the groove has the same diameter as the largest grinding ball.
  • the grooves form a resistance to lateral deflection of the ground material. This will reduce the noise level, but in this way no optimal grinding effect between the inner lining and the balls will be achieved.
  • the object of the invention is to improve the grinding effect between the balls and the inner lining of the ball mill, and the invention essentially exists in that the radius of the groove cross-section is larger than the radius of the largest grinding ball.
  • Grinding balls more useful decrease 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 ball i.e. a new grinding ball, is therefore decisive for the dimensioning of the groove cross section. Characterized in that the radius of the groove cross section is larger than the radius of such a new grinding ball, it is achieved that a layer of the ground material remains between the grinding balls and the groove. The grinding between the grinding balls and the inner lining thus takes place over the entire cross-section of the groove.
  • a regrind pad is formed between the balls and the groove, and this not only improves the grinding effect, but also prevents the ball surface from coming into direct contact with the inner lining. As a result, the wear of the groove or the inner lining, and thus also the wear of the balls, is substantially reduced and the noise development is further reduced.
  • the radius of the groove cross section is 3 to 7%, preferably about 5% of the ball radius larger than the radius of the largest grinding ball.
  • the radius of the groove cross-section is 2 to 3 mm, preferably 2 1/2 mm larger than the radius of the largest grinding ball. In these cases the grinding effect at the bottom of the grooves and on the flanks of the grooves is approximately the same and therefore an optimum grinding is achieved.
  • the drawing shows a cross section through a groove of the inner lining and a ball running in this groove.
  • a new and unworn ball is shown here, that is to say a ball that has the largest radius 4.
  • the circular segment-shaped groove 2 has a larger radius 5 in cross section than the radius 4 of the largest ball 3.
  • a regrind cushion 6 is therefore formed between the groove 2 and the ball 3.
  • the thickness of this ground material cushion corresponds to the difference between the radius 5 of the groove 2 and the radius 4 of the balls 3.
  • the grinding is therefore carried out both at the base 7 of the groove and in the region of the side flanks 8 thereof.
  • the difference between the two radii is approximately 2 1/2 mm in the embodiment of the drawing. With such a difference, the grinding takes place evenly at the base 7 of the groove and in the region of the side flanks thereof.
  • the new grinding balls have a radius of 40 to 60 mm.
  • the radius of the groove is therefore 3 to 7%, on average 5% larger than the radius of the balls.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Abstract

The rotatable drum of a cylindrical ball mill has an inner cladding formed by armour plates (1) and bearing circular segment-shaped grooves (2) running in the circumferential direction. The radius (5) of the groove cross-section is greater than the radius (4) of the largest milling ball (3).

Description

Die Erfindung bezieht sich auf eine rotierbare, zylindrische Kugelmühle mit einer Innenauskleidung, welche ungefähr in Umfangsrichtung verlaufende Rillen mit kreissegmentförmigem Querschnitt aufweist und innerhalb welcher Mahlkugeln angeordnet 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 dieser Ausbildung weist der kreissegmentförmige Querschnitt der Rille den gleichen Durchmesser wie die größte Mahlkugel auf. Bei einer solchen Ausbildung bilden die Rillen einen Widerstand gegen ein seitliches Ausweichen des Mahlgutes. Es wird dadurch die Lärmentwicklung vermindert, jedoch wird auf diese Weise noch kein optimaler Mahleffekt zwischen der Innenauskleidung und den Kugeln erreicht.The invention relates to a rotatable, cylindrical ball mill with an inner lining, which has approximately circumferential grooves with a circular segment-shaped cross section and within which grinding balls are arranged. 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 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 balls and inner lining is relatively small. The falling balls hit the bare inner lining, which causes a lot of wear on the one hand and a lot of noise on the other. 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 this embodiment, the circular segment-shaped cross section of the groove has the same diameter as the largest grinding ball. With such a design, the grooves form a resistance to lateral deflection of the ground material. This will reduce the noise level, but in this way no optimal grinding effect between the inner lining and the balls will be achieved.

Die Erfindung stellt sich zur Aufgabe, den Mahleffekt zwischen den Kugeln und der Innenauskleidung der Kugelmühle zu verbessern, und die Erfindung besteht im wesentlichen darin, daß der Radius des Rillenquerschnittes größer ist als der Radius der größten Mahlkugel.The object of the invention is to improve the grinding effect between the balls and the inner lining of the ball mill, and the invention essentially exists in that the radius of the groove cross-section is larger than the radius of the largest grinding ball.

Die Mahlkugeln nützer: 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. Es ist daher für die Bemessung des Rillenquerschnittes der Radius der größten Mahlkugel, das heißt also einer neuen Mahlkugel, maßgeblich. Dadurch, daß der Radius des Rillenquerschnittes größer ist als der Radius einer solchen neuen Mahlkugel, wird erreicht, daß zwischen den Mahlkugeln und der Rille eine Schicht des Mahlgutes verbleibt. Die Mahlung zwischen den Mahlkugeln und der Innenauskleidung erfolgt somit über den gesamten Querschnitt der Rille. Es bildet sich zwischen den Kugeln und der Rille ein Mahlgutpolster aus, und dadurch wird nicht nur der Mahleffekt verbessert, sondern es wird auch ein unmittelbarer Kontakt der Kugeloberfläche mit der Innenauskleidung vermieden. Dadurch wird wieder der Verschleiß der Rille bzw. der Innenauskleidung, somit auch der Verschleiß der Kugeln wesentlich verringert und es wird die Lärmentwicklung noch weiter verringert.Grinding balls more useful: decrease 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 ball, i.e. a new grinding ball, is therefore decisive for the dimensioning of the groove cross section. Characterized in that the radius of the groove cross section is larger than the radius of such a new grinding ball, it is achieved that a layer of the ground material remains between the grinding balls and the groove. The grinding between the grinding balls and the inner lining thus takes place over the entire cross-section of the groove. A regrind pad is formed between the balls and the groove, and this not only improves the grinding effect, but also prevents the ball surface from coming into direct contact with the inner lining. As a result, the wear of the groove or the inner lining, and thus also the wear of the balls, is substantially reduced and the noise development is further reduced.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist der Radius des Rillenquerschnittes um 3 bis 7 %, vorzugsweise um ungefähr 5 % des Kugelradius größer als der Radius der größten Mahlkugel. Bei einer solchen Bemessung ergibt sich ein ausreichender Mahlgutpolster zwischen den Kugeln und der Rillenoberfläche. Es hat sich gezeigt, daß ein optimaler Effekt erzielt werden kann, wenn der Radius des Rillenquerschnittes um 2 bis 3 mm, vorzugsweise um 2 1/2 mm größer ist als der Radius der größten Mahlkugel. In diesen Fällen ist der Mahleffekt am Grunde der Rillen und an den Flanken der Rillen ungefähr gleich und es wird daher ein Optimum der Mahlung erzielt.According to a preferred embodiment of the invention, the radius of the groove cross section is 3 to 7%, preferably about 5% of the ball radius larger than the radius of the largest grinding ball. With such a design, there is a sufficient ground material cushion between the balls and the groove surface. It has been shown that an optimal effect can be achieved if the radius of the groove cross-section is 2 to 3 mm, preferably 2 1/2 mm larger than the radius of the largest grinding ball. In these cases the grinding effect at the bottom of the grooves and on the flanks of the grooves is approximately the same and therefore an optimum grinding is achieved.

In der Zeichnung ist die Erfindung an Hand eines Ausführungsbeispieles schematisch erläutert. Die Zeichnung zeigt einen Querschnitt durch eine Rille der Innenauskleidung und eine in dieser Rille laufende Kugel.In the drawing, the invention is explained schematically using an exemplary embodiment. The drawing shows a cross section through a groove of the inner lining and a ball running in this groove.

In die rotierende Trommel der Kugelmühle sind Panzerplatten 1 eingesetzt, welche in Umfangsrichtung der Trommel verlaufende Rillen 2 aufweisen. Diese Rillen können entweder in Ebenen senkrecht zur Trommelachse liegen und daher in sich geschlossen sein, oder sie können auch schraubenlinienförmig innerhalb der Trommel verlaufen. In diesen Rillen laufen nun bei der Rotation der trommelförmigen Kugelmühle Kugeln 3. Hiebei ist eine neue und unverschlissene Kugel dargestellt, das heißt also eine Kugel, die den größten Radius 4 aufweist. Die kreissegmentförmige Rille 2 weist im Querschnitt einen größeren Radius 5 auf als der Radius 4 der größten Kugel 3. Es bildet sich daher zwischen der Rille 2 und der Kugel 3 ein Mahlgutpolster 6 aus. Die Stärke dieses Mahlgutpolsters entspricht der Differenz zwischen dem Radius 5 der Rille 2 und dem Radius 4 der Kugeln 3. Die Mahlung erfolgt daher sowohl am Grund 7 der Rille, wie auch im Bereich der Seitenflanken 8 derselben. Die Differenz zwischen den beiden Radien beträgt im Ausführungsbeispiel der Zeichnung ungefähr 2 1/2 mm. Bei einer solchen Differenz erfolgt die Mahlung am Grund 7 der Rille und im Bereich der Seitenflanken derselben gleichmäßig. Die neuen Mahlkugeln weisen je nach der Größe der Kugelmühle einen Radius von 40 bis 60 mm auf. Der Radius der Rille ist daher um 3 bis 7 %, im Mittel um 5 % größer als der Radius der Kugeln.Armored plates 1, which have grooves 2 running in the circumferential direction of the drum, are inserted into the rotating drum of the ball mill. These grooves can either lie in planes perpendicular to the drum axis and therefore be self-contained, or they can also run helically within the drum. Balls 3 now run in these grooves during the rotation of the drum-shaped ball mill. A new and unworn ball is shown here, that is to say a ball that has the largest radius 4. The circular segment-shaped groove 2 has a larger radius 5 in cross section than the radius 4 of the largest ball 3. A regrind cushion 6 is therefore formed between the groove 2 and the ball 3. The thickness of this ground material cushion corresponds to the difference between the radius 5 of the groove 2 and the radius 4 of the balls 3. The grinding is therefore carried out both at the base 7 of the groove and in the region of the side flanks 8 thereof. The difference between the two radii is approximately 2 1/2 mm in the embodiment of the drawing. With such a difference, the grinding takes place evenly at the base 7 of the groove and in the region of the side flanks thereof. Depending on the size of the ball mill, the new grinding balls have a radius of 40 to 60 mm. The radius of the groove is therefore 3 to 7%, on average 5% larger than the radius of the balls.

Claims (3)

1. Rotierbare, zylindrische Kugelmühle mit einer Innenauskleidung, welche ungefähr in Umfangsrichtung verlaufende Rillen (2) mit kreissegmentförmigem Querschnitt aufweist und innerhalb welcher Mahlkugeln (3) angeordnet sind, dadurch gekennzeichnet, daß der Radius (5) des Rillenquerschnittes größer ist als der Radius (4) der größten Mahlkugel (3).1. Rotatable, cylindrical ball mill with an inner lining which has approximately circumferential grooves (2) with a circular segment-shaped cross-section and within which grinding balls (3) are arranged, characterized in that the radius (5) of the groove cross-section is larger than the radius ( 4) the largest grinding ball (3). 2. Kugelmühle nach Anspruch 1, dadurch gekennzeichnet, daß der Radius (5) des Rillenquerschnittes um 2 bis 3 mm, vorzugsweise um 2 1/2 mm größer ist als der Radius (4) der größten Mahlkugel (3).2. Ball mill according to claim 1, characterized in that the radius (5) of the groove cross section is 2 to 3 mm, preferably 2 1/2 mm larger than the radius (4) of the largest grinding ball (3). 3. Kugelmühle nach Anspruch 1, dadurch gekennzeichnet, daß der Radius (5) des Rillenquerschnittes um 3 bis 7 %, vorzugsweise um ungefähr 5 % des Kugelradius größer ist als der Radius (4) der größten Mahlkugel (3).3. Ball mill according to claim 1, characterized in that the radius (5) of the groove cross section is larger by 3 to 7%, preferably by about 5% of the ball radius than the radius (4) of the largest grinding ball (3).
EP85890252A 1984-10-15 1985-10-09 Ball mill Withdrawn EP0179047A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT328784A AT380410B (en) 1984-10-15 1984-10-15 BALL MILL
AT3287/84 1984-10-15

Publications (2)

Publication Number Publication Date
EP0179047A2 true EP0179047A2 (en) 1986-04-23
EP0179047A3 EP0179047A3 (en) 1987-01-21

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ID=3548231

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EP85890252A Withdrawn EP0179047A3 (en) 1984-10-15 1985-10-09 Ball mill

Country Status (6)

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EP (1) EP0179047A3 (en)
JP (1) JPS6197048A (en)
AT (1) AT380410B (en)
BR (1) BR8505073A (en)
ES (1) ES8608929A1 (en)
IN (1) IN163069B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0245232A2 (en) * 1986-04-23 1987-11-11 VOEST-ALPINE Aktiengesellschaft Ball drum mill

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD298601A5 (en) * 1989-09-15 1992-03-05 Forschungsinstitut Fuer Aufbereitung,De INTERIOR CLADDING FOR TUBE BALL MILLS
JP3287330B2 (en) 1999-04-22 2002-06-04 日本電気株式会社 High frequency circuit shield structure

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1333946A (en) * 1916-03-09 1920-03-16 Travell Warren Grinding-machine
AT283092B (en) * 1965-04-08 1970-07-27 Boehler & Co Ag Geb Inner lining of ball mills

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT373792B (en) * 1981-01-30 1984-02-27 Ver Edelstahlwerke Ag BALL MILL
JPS60114357A (en) * 1983-11-28 1985-06-20 株式会社栗本鉄工所 Liner for mill

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1333946A (en) * 1916-03-09 1920-03-16 Travell Warren Grinding-machine
AT283092B (en) * 1965-04-08 1970-07-27 Boehler & Co Ag Geb Inner lining of ball mills

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0245232A2 (en) * 1986-04-23 1987-11-11 VOEST-ALPINE Aktiengesellschaft Ball drum mill
EP0245232A3 (en) * 1986-04-23 1988-08-10 VOEST-ALPINE Aktiengesellschaft Ball drum mill

Also Published As

Publication number Publication date
EP0179047A3 (en) 1987-01-21
ES547830A0 (en) 1986-09-01
AT380410B (en) 1986-05-26
JPS6197048A (en) 1986-05-15
IN163069B (en) 1988-08-06
ATA328784A (en) 1985-10-15
ES8608929A1 (en) 1986-09-01
BR8505073A (en) 1986-07-29

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