EP0245232A2 - Tube broyeur à billes - Google Patents

Tube broyeur à billes Download PDF

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Publication number
EP0245232A2
EP0245232A2 EP87890052A EP87890052A EP0245232A2 EP 0245232 A2 EP0245232 A2 EP 0245232A2 EP 87890052 A EP87890052 A EP 87890052A EP 87890052 A EP87890052 A EP 87890052A EP 0245232 A2 EP0245232 A2 EP 0245232A2
Authority
EP
European Patent Office
Prior art keywords
ring
disc
kugelrohr
mill according
chamber
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Withdrawn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
EP87890052A
Other languages
German (de)
English (en)
Other versions
EP0245232A3 (fr
Inventor
Wolfgang Dipl.-Ing. Stoiber
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.)
Voestalpine AG
Original Assignee
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 EP0245232A2 publication Critical patent/EP0245232A2/fr
Publication of EP0245232A3 publication Critical patent/EP0245232A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/10—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 one or a few disintegrating members arranged in the 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
    • B02C17/04—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
    • B02C17/06—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 with several compartments

Definitions

  • the invention relates to a ball tube mill with at least two, preferably arranged on a common axis, chambers, at least one of which contains solid steel grinding balls which roll on the rotatable inner wall of the chamber, the ground material being fed through a feed opening to the first chamber is and from this after appropriate comminution in the chamber following in the direction of the material flow.
  • Such ball tube mills are used, for example, for grinding various minerals and sintered products, in particular cement clinker. With such ball mills, grinding can be carried out in the finest form. With the known ball tube mills of this type, however, only materials up to a grain size of approximately 10 to 20 mm can be ground. Precrushing to such a grain size must therefore take place in the crusher before grinding in the ball mill.
  • the invention now aims to enable a pre-comminution of the ground material in an economical and energy-saving manner, and consists essentially in that the first grinding chamber in the direction of the material flow is designed as a prechamber which contains at least one circular ring or a circular disk made of steel as the grinding body , whose outer diameter is smaller than the clear inner diameter of the inner lining of the grinding chamber and corresponds to at least a quarter, preferably at least half, of the clear diameter of the inner lining of the grinding chamber and which or which led in a circumferential groove of the inner lining of the grinding chamber is.
  • the regrind should be drawn in between the bottom of the groove and the running surface of the ring or disc.
  • the crushing of the abandoned The material depends on the fact that the material is gripped by the ring or the disc rolling in the groove, and the feed angle is decisive for this.
  • ⁇ is the angle at which materials of the relevant grain size are drawn in by the ring or the disk.
  • the entry angle 2 ⁇ is assumed to be approximately 30 °.
  • the ring or disk With a diameter of the ring or disk of 1000 mm, there is, for example, the possibility of crushing materials with a maximum grain size of 100 mm between the ring or disk and the groove tread, which is a pressure reduction between the ring or disk and the groove tread. With an even larger diameter of the ring or the disk, material with an even larger grain size between the ring or disk and the groove can be pre-shredded.
  • the invention thus makes it possible to feed regrind with a substantially larger grain size to the ball tube mill and to master the comminution in the ball mill and to save expensive separate crushers. In conventional ball mills, the crushing had to be carried out by a crusher unit up to a grain size of at most 10 to 15 mm, which, however, requires a greater effort.
  • the upstream connection of a pressure comminution chamber in the ball mill only requires a slight extension of the ball tube mill. Since such a ring or a disc can have a very large weight due to its size, the pressure component also results to enable the pressure reduction of the grain between the groove and the running surface of the ring or the disc. It is therefore essential according to the invention that the diameter of the ring or disk corresponds to at least a quarter, preferably at least half, of the inside diameter of the inner lining of the grinding chamber.
  • the outside diameter of the ring or the disc must be smaller than the inside diameter of the inner lining the grinding chamber, so that the condition is fulfilled that the ring or the disc can roll in the groove of the grinding chamber, and thus a gap for receiving the material to be ground remains between the running surface of the ring or the disc and the groove.
  • the outer diameter of the disk or the ring is preferably 20-40%, preferably approximately 25%, smaller than the diameter of the groove base of the inner lining. Because the grinding element is formed by a ring or a sheath, the axial extension of the prechamber can be relatively small, despite the diameter of the ring or the disc and the high weight of the same or the same, so that the length of the ball tube mill can be kept within limits can.
  • the cross section of the groove is expediently larger than the cross section of the tread of the ring or the disk, the tread of the ring or the disk and the groove having a similar cross-sectional shape. This ensures that an intermediate layer of the ground material is formed between the groove and the running surface of the ring or the disk.
  • the cross section of the running surface of the ring or the disk is semicircular.
  • the cross-section of the tread of the ring or the disk can also be widened compared to a semicircular shape and / or flattened in the central region.
  • the cross section of the groove in the central region is also conveniently flattened. If the running surface of the ring or the disk or the base of the groove has such a flattening in the central region, the grinding surface is widened and the pressure reduction is thus made more effective.
  • the side edges of the groove are preferably drawn away at least on one side thereof away from the axis of the mill. This ensures better guidance of the ring or disk in the groove.
  • the ring or disc be heavy.
  • the ring or the disk made of steel can therefore be hollow and can be completely or partially filled with heavier material, such as lead.
  • the arrangement can also be such that a load weight is pivotally suspended in the axis of the ring or the disc in the plane of the ring or disc. As a result, the center of gravity of the ring or the disk can be arranged deeply, so that the ring or the disk runs better in the groove.
  • the ring or the disk can have an exchangeable armor.
  • the ring or the disk can also be detachably composed of segments. This also makes it possible to replace defective parts of the rings or the disk and, above all, enables the ring or the disk to be installed in an existing ball tube mill, the first chamber of which is designed as a pre-chamber with a corresponding inner lining.
  • the replacement of the inner lining is not a problem since, as is known per se, the armor forming the inner lining can be composed of appropriate elements.
  • rings or disks can also be arranged axially one behind the other in the same antechamber, which run in separate grooves. This represents a duplication of the effect of the pressure reduction.
  • the partition between the pre-chamber and the subsequent grinding chamber can be double-walled, the wall adjacent to the pre-chamber being designed as a sieve and the wall adjacent to the subsequent grinding chamber being designed with a central through-opening.
  • the double walled partition thus delimits a space which is equipped with radial lifting blades for the further transport of the ground material. From this space, the pre-shredded material reaches the subsequent grinding chamber through the central outlet.
  • Fig. 1 shows a partial section through a ball mill equipped with the prechamber.
  • Fig. 2 shows the schematic of the principle of the arrangement of a ring or a disc in the antechamber.
  • Fig. 3 shows a modified shape of the groove and the tread of the disc.
  • Fig. 4 shows the diagram of a ring or a disc with the groove forming the raceway of the prechamber, the relationships between the ring or disc and groove are explained when the material to be ground is drawn in.
  • the ball mill 1 has one or more grinding chambers partially filled with balls 2.
  • the tread of the balls 2 is formed by a groove armor 4.
  • the ground material that has already been comminuted is coarsely ground in the pebble pile 3 and finely ground between the balls 2 and the groove armor 4.
  • the material feed takes place in the axis 5 of the ball mill via a feed hopper 6. From the feed hopper 6, the feed material reaches the prechamber 7, in which a ring or a disk 8 is arranged, which runs in a groove 9 in the inner lining 10 of this prechamber 7.
  • the ring 8 has a semicircular running surface. Instead of the ring, a full disc can naturally also be used.
  • the outer diameter a of the ring 8 is approximately 25% smaller than the diameter D of the base 11 of the groove 9.
  • the regrind fed through the feed hopper 6 can therefore be without get further into the groove 9 and is crushed between the groove 9 and the tread 12 of the ring 8.
  • ground material with a very large grain size can also be drawn in between the tread 12 of the ring 8 and the groove. For example, grain sizes of 150 to 200 mm can be handled in this way.
  • the wall surface 13 is arranged at an angle so that the material fed in through the feed hopper 6 is passed into the groove 9.
  • the wall 14 delimiting the antechamber 7 has slots 15, etc. Expediently concentric circular slots through which the shredded material is conveyed from the pre-chamber 7 into an intermediate space 16 between the wall 14 and a wall 17.
  • In the space 16 there are co-rotating lifting blades, which are not shown and which feed the pre-comminuted regrind to a central opening 18 in the wall 17 through which the pre-comminuted regrind enters the grinding chamber 19 containing the ball 2.
  • the material was already pre-shredded in the pre-chamber 7 so that, for example, regrind in a grain size of about 10 mm is fed to the chamber 17.
  • Fig. 1 an arrangement is shown in which a ring 8 is mounted in the prechamber 7, which runs in a groove 9.
  • the antechamber train it is also possible to use the antechamber train longer and arrange two or more rings 8 axially one behind the other, which run in two or more grooves 9.
  • the pressure reduction effect between the tread 12 of the ring 8 and the base 11 of the groove 9 can be multiplied in this way.
  • Fig. 2 the arrangement of the ring 8 or a disk and the groove base 11 of the groove 9, in which the ring 8 runs, is shown schematically.
  • the arrows 20 and 21 indicate the direction of rotation of the groove 9 and the ring 8 while the ball tube mill 1 is running.
  • FIG. 3 shows a modified form of the running surface of the ring or the disk and of the cross section of the groove 9.
  • a disk 22 is shown here instead of the ring 8.
  • the tread 23 of the disc 22 is flattened and therefore widened.
  • the groove base 24 is also flattened. The available grinding surface is thus widened, so that the grinding effect is improved.
  • the flanks 13 adjoining the groove 9 are again selected to be steep, as a result of which these flanks ensure that the ring 8 or the disk 22 is guided in the groove 9.
  • the ring 8 or the disc 22 have a very large weight due to their size.
  • the weight can be one or more tons. This weight is essential since this weight is used to reduce the pressure.
  • the weight of the ring 8 or the disc 22 can be increased even further in that the ring 8 or the disc 22 is made of steel hollow and receives a lead filling.
  • Fig. 4 the design relationships of the running surface 12 of the ring 8 or the disk 22 are shown schematically, by means of which the material to be subjected to pressure reduction is drawn in between the groove base 11 or 24 and the ring 8 or disk 22.
  • the largest radius R1 of the grinding path formed by the groove base 11, 24 is 2 m and the ring 8 or the disk 22 has a radius R2 of 1.5 m.
  • the grain of material 25 is assumed to be spherical and assigned a radius R3 of 0.2 m.
  • the relationships shown in FIG. 4 then result, the material grain 25 being detected in the narrowing gap between the groove base 11, 24 and the ring 8 or the disk 22 at a point which is relative to the center of the ring 8 or the disc 22 lies at a central angle ⁇ of approximately 85 ° to the vertical 26 and with respect to the axis of the ball tube mill at a central angle ⁇ of approximately 68 ° to the vertical 26.
  • the radial force P acting on the material grain 25 detected in the gap can be broken down into a pressure component D and a counter component G, which tries to force the material grain 25 out of the gap.
  • the angle 2 ⁇ is approximately 15 ° and does not exceed the limit of approximately 30 ° applicable for safe drawing in at any point of the crescent-shaped gap, so that not only material parts with a grain size of 0.4 m are reliably detected, but theoretically also material parts with a grain size up to 1 m (Gap width at the highest point of the Kugelrohr mill).

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP87890052A 1986-04-23 1987-03-18 Tube broyeur à billes Withdrawn EP0245232A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT108786A ATA108786A (de) 1986-04-23 1986-04-23 Kugelrohrmuehle
AT1087/86 1986-04-23

Publications (2)

Publication Number Publication Date
EP0245232A2 true EP0245232A2 (fr) 1987-11-11
EP0245232A3 EP0245232A3 (fr) 1988-08-10

Family

ID=3506305

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87890052A Withdrawn EP0245232A3 (fr) 1986-04-23 1987-03-18 Tube broyeur à billes

Country Status (2)

Country Link
EP (1) EP0245232A3 (fr)
AT (1) ATA108786A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0965387A1 (fr) 1998-06-17 1999-12-22 Ömag-Montananlagenbau GmbH Broyeur pour le traitement respectivement le broyage de matières solides
RU2236298C1 (ru) * 2003-05-05 2004-09-20 Белгородская государственная технологическая академия строительных материалов Трубная мельница
CN102540898A (zh) * 2010-12-09 2012-07-04 刘荣富 一种新型球磨机节能系统
CN101157200B (zh) * 2007-11-16 2012-11-21 河南黄河旋风股份有限公司 金刚石微粉整形球磨机的钢球配比方法
CN108145390A (zh) * 2018-01-15 2018-06-12 天津辅然分离机械有限公司 推料离心机筛片的制作工艺

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE160215C (fr) * 1904-07-06
US1394334A (en) * 1917-08-23 1921-10-18 Allis Chalmers Mfg Co Comminuting-mill
DE621025C (de) * 1933-12-05 1935-10-31 Karl Querfurth Trommelmuehle mit einer oder mehreren losen Mahlwalzen
DE614965C (de) * 1933-12-12 1935-06-22 Karl Querfurth Verfahren zum Betriebe von Muehlen mit schnell umlaufender Trommel
FR1085844A (fr) * 1952-05-28 1955-02-07 Moulin horizontal à rouleaux pour le broyage du ciment ou d'autres produits
DE1055926B (de) * 1957-10-24 1959-04-23 Loesche Hartzerkleinerungs U Z Federrollenmuehle
US3987969A (en) * 1975-03-10 1976-10-26 Kvaerner Brug A/S Method and disc mill for grinding of material
DE3490332T1 (de) * 1983-06-30 1985-06-27 Kabushiki Kaisha Kobe Seiko Sho, Kobe Walzenmühle
DE3327814A1 (de) * 1983-08-02 1985-03-07 E.-Ulrich Dipl.-Ing. 6551 Frei Laubersheim Mathieu Druckscherkraft rollen- oder walzenmuehle
JPS60199099A (ja) * 1984-03-23 1985-10-08 Hitachi Ltd 高濃度石炭スラリ−の製造方法及び装置
AT380411B (de) * 1984-10-15 1986-05-26 Voest Alpine Ag Kugelmuehle
AT380410B (de) * 1984-10-15 1986-05-26 Voest Alpine Ag Kugelmuehle
DE3618461A1 (de) * 1985-06-04 1986-12-04 Voest-Alpine Ag, Linz Kugelrohrmuehle

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0965387A1 (fr) 1998-06-17 1999-12-22 Ömag-Montananlagenbau GmbH Broyeur pour le traitement respectivement le broyage de matières solides
RU2236298C1 (ru) * 2003-05-05 2004-09-20 Белгородская государственная технологическая академия строительных материалов Трубная мельница
CN101157200B (zh) * 2007-11-16 2012-11-21 河南黄河旋风股份有限公司 金刚石微粉整形球磨机的钢球配比方法
CN102540898A (zh) * 2010-12-09 2012-07-04 刘荣富 一种新型球磨机节能系统
CN108145390A (zh) * 2018-01-15 2018-06-12 天津辅然分离机械有限公司 推料离心机筛片的制作工艺

Also Published As

Publication number Publication date
ATA108786A (de) 1989-07-15
EP0245232A3 (fr) 1988-08-10

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Inventor name: SCHEUCHER, FRANZ