EP2484450B2 - Broyeur agitateur à billes - Google Patents

Broyeur agitateur à billes Download PDF

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Publication number
EP2484450B2
EP2484450B2 EP12000233.2A EP12000233A EP2484450B2 EP 2484450 B2 EP2484450 B2 EP 2484450B2 EP 12000233 A EP12000233 A EP 12000233A EP 2484450 B2 EP2484450 B2 EP 2484450B2
Authority
EP
European Patent Office
Prior art keywords
grinding container
grinding
ball mill
agitator
suspension
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.)
Active
Application number
EP12000233.2A
Other languages
German (de)
English (en)
Other versions
EP2484450A3 (fr
EP2484450A2 (fr
EP2484450B1 (fr
Inventor
Eberhard Lipp
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.)
Lipp Mischtechnik GmbH
Original Assignee
Lipp Mischtechnik GmbH
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
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Application filed by Lipp Mischtechnik GmbH filed Critical Lipp Mischtechnik GmbH
Publication of EP2484450A2 publication Critical patent/EP2484450A2/fr
Publication of EP2484450A3 publication Critical patent/EP2484450A3/fr
Application granted granted Critical
Publication of EP2484450B1 publication Critical patent/EP2484450B1/fr
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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
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • 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
    • 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
    • B02C17/183—Feeding or discharging devices
    • 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
    • B02C17/24—Driving mechanisms

Definitions

  • the invention relates to an agitator ball mill with a grinding container and an axially extending agitator shaft which is connected at at least one end to the wall of the grinding container via a rotary feedthrough. According to the preamble of the attached main claim.
  • agitator ball mills are used to comminute the solids of liquid, disperse systems or suspensions.
  • grinding media are mostly balls made of steel, glass or ceramic materials.
  • the axially arranged agitator shaft can be found inside the grinding container, on which agitator elements such as disks or rods are arranged in a rotationally fixed manner.
  • the rotation of this stirrer shaft causes the grinding media to move intensively.
  • Said suspension is pumped through the grinding container of the agitator ball mill with simultaneous rotation of the agitator shaft, the solid particles within the suspension being comminuted by the impact and shear forces acting on them, which are generated by the grinding media.
  • a suitable device is then provided at the outlet of the grinding container, by means of which the grinding bodies are held in the grinding container while the suspension with the comminuted solids contained therein can exit.
  • a particular problem from a structural point of view for the safe operation of an agitator ball mill is the sealing of the rotary leadthrough at the entry of the agitator ball shaft into the grinding container.
  • grinding media will damage the rotating unions present here, be it through impact or through friction. This risk is particularly high when mechanical seals are used for the rotary feedthrough.
  • a protective disk covering the rotary leadthrough is arranged in the grinding container adjacent to the rotary leadthrough.
  • Corresponding devices are known from DE 10 2008 058 585 A1 , of the EP 0 074 633 B1 or the U.S. 5,330,112 A .
  • the object of the present invention is therefore to develop previously known agitator ball mills.
  • the agitator ball mill according to the invention is defined by claim 1.
  • the protective disk is attached to the agitator shaft.
  • the position of the protective disk can be fixed well within the grinding container without having to provide a fastening for the protective disk that would hinder the throughput of ground material.
  • the protective disk is provided on its side facing the rotary feedthrough with conveyor vanes extending essentially in the radial direction. The resulting flow of incoming suspension, first in the radial direction and then past the protective disk in the axial direction, produces a particularly good conveying effect for suspension through the grinding container.
  • the suspension in the axial direction, .d. H. is introduced into the grinding container parallel to the direction of the agitator shaft.
  • a convergent annular gap which is present on the circumference of the protective disk between it and the surrounding wall of the grinding container, can ensure, on the one hand, that suspension is fed evenly into the grinding container.
  • this convergent annular gap also breaks up coarse agglomerations of solid materials in the suspension, for which purpose the shear stresses within the suspension that occur when the suspension passes through said convergent gap can be used.
  • the radial dimensions of the convergent gap in particular at its end facing the interior of the grinding container, are selected so that grinding bodies with their usual dimensions cannot penetrate the gap.
  • the grinding container is provided with a ball drain on its wall, which is located in the area of the side of the protective disk facing the grinding container.
  • FIG. 1 you can see the side view of an agitator ball mill.
  • a vertically arranged agitator shaft 3 is driven via an electric motor 1 with the interposition of a gear arranged in a gear box 2.
  • This agitator shaft is equipped with agitating elements aligned in the axial direction in the form of rods 4 which mesh with counter rods 5 which are arranged on the wall 6 of the grinding container 7 and project radially inward.
  • the wall 6 is designed with two shells, so that it forms a cooling jacket 8, into which cooling water is introduced through a cooling water inlet 9 and is discharged again from a cooling water outlet 10.
  • the agitator shaft 3 is also designed to be correspondingly cooled.
  • the interior of the grinding container 7 is for the most part filled with grinding bodies 11 which take up a volume of 60 to 80% of the free space in the grinding container 7.
  • a suspension is now pumped through the interior of the grinding container 7.
  • the grinding media 11 are set in motion, the solid particles in the suspension mentioned being comminuted by the impact and shear forces of the grinding media that collide with one another.
  • annular gap 12 At the upper end of the grinding container there is an annular gap 12 through which the suspension with the comminuted solid particles passes in order to leave the grinding container 7 through a suspension outlet 13. Its dimensions, in particular the clear width of the annular gap 12, prevent the grinding media from being discharged from the grinding container 11.
  • a protective disk 16 is provided on the agitator shaft 3 in this area. This extends in the radial direction over the actual rotary leadthrough 14 and thus prevents individual grinding media 11 from hitting the rotary leadthrough 14 and damaging it.
  • the protective disk 16 is formed in one piece with the agitator shaft 3 and also has conveying vanes 17 extending in the radial direction on its side facing the rotary leadthrough 14. With these conveying vanes 17, suspension which enters the grinding container 7 parallel to the axis of the agitator shaft 3 through a feed pipe 18 is conveyed into the grinding container 3 as with a pump wheel of a centrifugal pump.
  • This suspension is deflected in the radial direction after exiting the feed pipe 18 and is then, as shown in FIG Figure 2 can be seen, pressed through a convergent gap 19 aligned in the axial direction, as a result of which the suspension is specifically accelerated and thus subjected to shear, which leads to a breakdown of agglomerations of particles within the suspension.
  • the clear width of the convergent gap lying in the radial direction is selected so that it is smaller at the end of the annular gap facing the interior of the grinding container 7 than a conventional size of a grinding body 11. This prevents undesired penetration of grinding bodies 11 into the gap 19 and thus also prevented in the space between the protective disk 16 and the rotary leadthrough 14 and the rotary leadthrough 14 is thus reliably protected from wear caused by grinding media.
  • This ball emptying opening 22 is provided in the wall 6 of the flour container 7 and can be closed by a plug 23. When this plug 23 is removed, the grinding bodies 11 present in the grinding container 7 can be removed for replacement through the ball emptying opening 22.
  • the rotary feedthrough 14 is protected by the protective disk 16 and thus the agitator ball mill can be designed to be more reliable.

Landscapes

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

Claims (2)

  1. Broyeur-agitateur à billes, comprenant un récipient de broyage (7) et un arbre de malaxage (3) qui s'étend axialement dans ce dernier et est relié par au moins une extrémité à la paroi (15) dudit récipient de broyage (7), par l'intermédiaire d'une traversée rotative (14), un disque de protection (16), recouvrant la traversée rotative (14) et logé dans ledit récipient de broyage (7), au voisinage de ladite traversée rotative (14), étant fixé audit arbre de malaxage (3) et étant pourvu d'ailettes de convoyage (17) qui s'étendent dans le sens radial,
    en ce que les ailettes de convoyage (17) sont situées du côté du disque de protection (16) pointant vers la traversée rotative (14), de manière à engendrer un écoulement de suspension admise qui s'opère tout d'abord dans le sens radial, puis parcourt le récipient de broyage (7) dans le sens axial, en regard dudit disque de protection (16)
    caractérisé par le fait
    qu'une ouverture de vidage (22), coïncidant avec le disque de protection (16), est prévue dans la paroi (6) du récipient de broyage (7).
  2. Broyeur-agitateur à billes, selon la revendication 1,
    caractérisé par
    la présence d'un interstice annulaire convergent (19), entre le disque de protection (16) et la paroi périphérique (6) du récipient de broyage (7).
EP12000233.2A 2011-02-07 2012-01-17 Broyeur agitateur à billes Active EP2484450B2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011010527A DE102011010527A1 (de) 2011-02-07 2011-02-07 Rührwerkskugelmühle

Publications (4)

Publication Number Publication Date
EP2484450A2 EP2484450A2 (fr) 2012-08-08
EP2484450A3 EP2484450A3 (fr) 2016-04-20
EP2484450B1 EP2484450B1 (fr) 2017-05-03
EP2484450B2 true EP2484450B2 (fr) 2020-08-19

Family

ID=45558480

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12000233.2A Active EP2484450B2 (fr) 2011-02-07 2012-01-17 Broyeur agitateur à billes

Country Status (2)

Country Link
EP (1) EP2484450B2 (fr)
DE (1) DE102011010527A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013111564B3 (de) * 2013-10-21 2015-02-12 Netzsch-Feinmahltechnik Gmbh Vorrichtung und verfahren zum starten einer rührwerkskugelmühle
DE102015105103A1 (de) * 2015-04-02 2016-10-06 Netzsch-Feinmahltechnik Gmbh Verschlusssystem für den Mahlbehälter einer Zerkleinerungseinrichtung und Mahlbehälter mit einem derartigen Verschlusssystem und Zerkleinerungseinrichtung mit einem Mahlbehälter
DE102021101527B4 (de) * 2021-01-25 2023-05-17 Wilhelm Niemann Gmbh & Co. Rührwerksmühle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2308821A1 (de) † 1972-05-09 1973-11-29 Jun Edward Henry Cumpston Vorrichtung zum mischen und zerkleinern von material hoher viskositaet
DE3716587C1 (de) † 1987-05-18 1988-04-28 Draiswerke Gmbh Ruehrwerksmuehle
DE4332549A1 (de) † 1992-10-19 1994-04-21 Buehler Ag Rührwerksmühle
EP1468739B1 (fr) † 2003-04-15 2008-03-19 Willy A. Bachofen AG Broyeur agitateur à billes

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3136323A1 (de) * 1981-09-12 1983-03-31 Boehringer Mannheim Gmbh, 6800 Mannheim Verfahren zum betreiben einer kugelmuehle und entsprechende kugelmuehle
JP2566884Y2 (ja) * 1992-05-27 1998-03-30 三井鉱山株式会社 粉砕機
DE102008058585A1 (de) * 2008-11-22 2010-05-27 Netzsch-Feinmahltechnik Gmbh Rührwerkskugelmühle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2308821A1 (de) † 1972-05-09 1973-11-29 Jun Edward Henry Cumpston Vorrichtung zum mischen und zerkleinern von material hoher viskositaet
DE3716587C1 (de) † 1987-05-18 1988-04-28 Draiswerke Gmbh Ruehrwerksmuehle
DE4332549A1 (de) † 1992-10-19 1994-04-21 Buehler Ag Rührwerksmühle
EP1468739B1 (fr) † 2003-04-15 2008-03-19 Willy A. Bachofen AG Broyeur agitateur à billes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Vorbenutzung Rührwerkskugelmühle LME 300 K †

Also Published As

Publication number Publication date
EP2484450A3 (fr) 2016-04-20
EP2484450A2 (fr) 2012-08-08
DE102011010527A1 (de) 2012-08-09
EP2484450B1 (fr) 2017-05-03

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