EP0260604A2 - Broyeur à agitateur - Google Patents

Broyeur à agitateur Download PDF

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Publication number
EP0260604A2
EP0260604A2 EP87113255A EP87113255A EP0260604A2 EP 0260604 A2 EP0260604 A2 EP 0260604A2 EP 87113255 A EP87113255 A EP 87113255A EP 87113255 A EP87113255 A EP 87113255A EP 0260604 A2 EP0260604 A2 EP 0260604A2
Authority
EP
European Patent Office
Prior art keywords
grinding
pipe section
agitator mill
grinding media
mill according
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.)
Granted
Application number
EP87113255A
Other languages
German (de)
English (en)
Other versions
EP0260604A3 (en
EP0260604B1 (fr
Inventor
Peter Schertenleib
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.)
Erich Netzsch GmbH and Co Holding KG
Original Assignee
Erich Netzsch GmbH and Co Holding KG
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 Erich Netzsch GmbH and Co Holding KG filed Critical Erich Netzsch GmbH and Co Holding KG
Publication of EP0260604A2 publication Critical patent/EP0260604A2/fr
Publication of EP0260604A3 publication Critical patent/EP0260604A3/de
Application granted granted Critical
Publication of EP0260604B1 publication Critical patent/EP0260604B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B02C17/161—Arrangements for separating milling media and ground material

Definitions

  • the invention relates to an agitator mill - a grinding room for the treatment of regrind in the presence of grinding bodies, - an agitator in the grinding chamber, a separating device which allows treated grinding material to emerge from the grinding chamber, but retains grinding media in the grinding chamber, - A rotatably drivable tube piece that surrounds the separating device, is open at one end for an axial inflow of grinding stock and grinding media and allows grinding media to flow back into the grinding chamber, and - At least one conveying element, which is arranged within the pipe section, is also driven in rotation and is designed to generate an axial flow.
  • a hollow end section of the agitator is provided as the rotationally drivable tube piece which surrounds the separating device.
  • the separating device is a sieve cartridge which projects through an end wall of the agitator mill that delimits the grinding chamber into the hollow end section of the agitator shaft and is thus largely protected against the direct impact of grinding media activated in the painting chamber.
  • a conveyor element is rings a helix is attached to the sieve cartridge in the hollow end section of the agitator shaft and promotes an annular flow of grinding media and grinding material from the open end face of the hollow end section into its cavity.
  • the hollow end section has a plurality of slot-shaped, axially parallel cutouts as outlets for grinding media.
  • a separating device is a coaxial with the agitator shaft, but separately drivable from it, which has a head piece with radial inlets within the grinding chamber, adjacent to a free end of the agitator shaft .
  • This The headpiece is intended to hurl penetrated grinding media back into the grinding chamber and only admit finished grinding material, so that it can then be guided axially outwards.
  • this device does not have sufficient selectivity for many purposes and can therefore generally not replace a Seib or annular gap arrangement as a separating device.
  • rotary cartridges are also known (DE-A-1 757 942); however, these are not protected against the impact of activated grinding media by a rotating pipe section surrounding them, but rather in that they are each arranged in a separate housing which is connected to the grinding vessel only by lines. This arrangement also has a large space requirement in relation to the performance of the separating devices.
  • the invention is therefore based on the object of developing an agitator mill of the type described at the outset in such a way that a separating device with any desired selectivity and sufficient throughput can also be combined with a slim agitator.
  • the object is achieved in that -
  • the pipe section is arranged separately from the agitator and can be driven independently of it, and -
  • the conveying element is designed to generate a jacket flow, which extends in the pipe section around a central axial inflow of grinding media and grinding stock, is opposed to this and mainly consists of grinding media.
  • At least a section of the inner wall of the pipe section which can be driven in rotation, expanding conically towards its open end, designed as a conveying element.
  • a helix which promotes its open end face in the direction of its operating rotation is arranged on the inner wall of the pipe section which can be driven in rotation.
  • Such an inner tube can be combined with a helix of the configuration described above in such a way that the helix connects the inner tube to the pipe section which can be driven in rotation.
  • At least one transverse wing can be arranged as a conveying element on the bottom of the rotationally drivable pipe section.
  • the type of regrind within the rotationally drivable pipe section according to the invention can reduce the space requirement of this pipe section within the grinding chamber in that the rotatably driven pipe section is arranged at least for the most part outside the grinding chamber and connected to it through an opening which is at least approximately as large as the open end face of the pipe section.
  • a grinding element inlet for introducing grinding elements into the grinding chamber is arranged coaxially with the rotationally drivable tube piece.
  • Grinding media in agitator mills are subject to wear, which can be so considerable, especially when finely grinding abrasive regrind such as ferrites, that the grinding media shrinkage must be compensated for continuously or at short intervals, so that the optimal operation of the agitator mill can be maintained.
  • shrinkage of grinding media that occurs during grinding of a grinding stock, when changing to a different grinding stock, it is usually necessary to replace the entire filling of the grinding media with another one that differs from the previously used grinding media filling in terms of material composition and / or the size of the grinding media or also differs simply in that the new grinding media filling has been cleaned outside the agitator mill.
  • the grinding media inlet arranged coaxially with the rotationally drivable tube piece makes the rotor usable in addition to the tasks that it has in connection with the grinding material outlet as a means of conveying fresh grinding media from the grinding media inlet into the grinding chamber.
  • This enables a rapid supply of paint bodies which can be regulated by the choice of the speed of the rotationally drivable pipe section.
  • the more or less rapidly rotating pipe section also helps to distribute the grinding media introduced through the grinding media inlet in a more or less wide area of the grinding chamber.
  • the latter has the shape of an annular chamber which is arranged around the rotatingly drivable tube piece.
  • the grinding element inlet is a tube which opens between the separating device and the grinding chamber within the pipe section which can be driven in rotation.
  • FIG. 1 to 5 show, in each case in an axial section, the outlet area of an agitator mill in five configurations according to the invention.
  • a wall 10 of a grinding container is indicated, which encloses a grinding chamber 12.
  • the grinding chamber 12 is partially filled with grinding media 14 and grinding stock 16, which are activated together by an agitator 18.
  • a stirrer shaft 20 belongs to the agitator 18, which is of the usual type and is also only indicated, which can be driven in rotation about its axis 22 and is equipped with stirring elements 24. It can be a standing or lying agitator mill; it does not matter whether the axis 22 is arranged vertically or horizontally.
  • the hollow shaft 28 can be driven in rotation by a motor 30 which, for example, is flanged to the bearing housing 26 as shown in FIGS. 1 to 4 or is placed on the bearing housing as shown in FIG. 5.
  • the hollow shaft 28 belongs to a pipe section 32 which is arranged inside the grinding chamber 12 and which is fastened to the hollow shaft 28 or is formed in one piece.
  • the pipe section 32 is pot-like with a bottom 34 according to FIGS. 1 to 3 and 5 provided on which a separator 36 is attached. 5, however, the pipe section 32 is funnel-shaped and the separating device 36 is arranged in a central region of the filter.
  • the separating device 36 is arranged coaxially with the tube piece 32 and has the shape of a sieve which, according to FIGS. 1 to 4, is flat, but is cylindrical according to FIG. 5.
  • the separating device can also be formed by an annular gap arrangement, for example arranged on the bottom 34, as is also common as such in agitator mills.
  • the mesh size or other passage width of the separating device 36 is dimensioned such that the grinding media 14 are retained in the grinding chamber 12, but finished millbase 16 can flow through the hollow shaft 28 to an outlet 38.
  • the tube piece 32 has a conical inner wall 40 which widens towards its open end face 42. Because of this design, which is particularly pronounced in FIG. 4, the inner wall 40, when the tube piece 32 rotates, acts as a conveying element which strives to have a central axial inflow 44 of grinding media 14 and grinding stock 16 in an opposite, cross-section convert annular sheath stream 46. This conversion primarily affects the grinding media 14, since due to their higher density compared to the grinding stock 16, they gradually move radially outward within the rotating pipe section 32 and thereby reach the area of influence of the conical inner wall 40.
  • the treated regrind 16 flows through the separating device 36 to the outlet 38.
  • the rotationally drivable pipe section 32 has a cylindrical inner wall 40, which as such is unable to exert axial forces on the grinding media 14, but which carries a coil 48 as a conveying element.
  • the helix 48 is designed in such a way that the particles in the operating direction of rotation exert forces on the particles which reach their area of influence with components directed axially toward the free end face 42 of the tube piece 32.
  • the particles concerned are essentially grinding media 14, which have been separated from the central axial inflow 44 by centrifugal forces.
  • a jacket stream 46 consisting of grinding media 14 is created.
  • the helix 48 In order to prevent any action of the helix 48 on the axial inflow 44, the latter is guided through an inner tube 50 which is arranged coaxially with the tube piece 32 and is fixedly connected to it by the helix 48.
  • FIG. 3 differs from FIG. 2 only in that the rotationally drivable pipe section 32 is arranged completely outside the grinding chamber 12 and is nevertheless connected to the grinding chamber 12 over the entire area of its open end face 42.
  • the open end face 42 lies in the plane of the inner side of the wall 10 with respect to the grinding chamber 12, so that the pipe section 32 does not take up any space within the grinding chamber 12 and the stirring shaft 20 can reach approximately as close to the wall 10 as if the pipe section 32 unavailable.
  • An arrangement of the pipe section 32, as shown in Fig. 3, can also be realized in an embodiment which otherwise corresponds to Fig. 1 or a combination of the conical inner wall 40 from fig. 1 with the helix 48 from FIG. 2.
  • a transverse wing 52 can be arranged as a further conveying element within the tube piece 32 which can be driven in rotation in the region of the bottom 34 thereof. This favors the conversion of the central axial inflow 44 from grinding media 14 and grinding stock 16 into the jacket stream 46 consisting of grinding media 14.
  • a grinding element inlet 56 is arranged coaxially with the tube piece 32 which can be driven in rotation.
  • the grinding media inlet 56 is a conical annular space which is arranged around the hollow shaft 28 belonging to the rotatably drivable pipe section 32 and widens towards the grinding chamber 12 with the same cone angle as the funnel-shaped rotatably driven pipe section 32 itself a line 58 which connects a reservoir 60 filled with grinding media 14 to the grinding media inlet 56 and can be shut off by means of a shut-off valve 62.
  • the grinding element inlet 56 is formed by a tube which extends within the hollow shaft 28 over its entire length, is connected to it for common rotation and opens within the region of the tube piece 32 provided with a conical inner wall 40.
  • An annular plate 64 is arranged at the mouth of the grinding media inlet 56; the end of the separating device 36 facing the grinding chamber 12, which is designed as a cylindrical sieve according to FIG. 5, is supported on this. The end of this separating device 36 facing away from the grinding chamber 12 is fastened to the bottom 34 of the pipe section which can be driven in rotation.
  • a pipe socket 66 is inserted, which is formed on a storage container 12 and is provided with an annular seal 68.
  • the pipe socket 66 can contain a gate valve which corresponds to the gate valve 62 shown in FIG. 4.
  • the pipe socket 66 can only be used for refilling grinding media 14 into the grinding media inlet 56 and removed together with the reservoir 60 for normal operation of the agitator mill.
  • the grinding media inlet 56 can be closed with a stopper 70, which, as indicated by dashed lines in FIG. 5, expediently extends over the entire length of the tubular grinding media inlet 56.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP87113255A 1986-09-15 1987-09-10 Broyeur à agitateur Expired - Lifetime EP0260604B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863631375 DE3631375A1 (de) 1986-09-15 1986-09-15 Ruehrwerksmuehle
DE3631375 1986-09-15

Publications (3)

Publication Number Publication Date
EP0260604A2 true EP0260604A2 (fr) 1988-03-23
EP0260604A3 EP0260604A3 (en) 1989-02-22
EP0260604B1 EP0260604B1 (fr) 1990-11-22

Family

ID=6309627

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87113255A Expired - Lifetime EP0260604B1 (fr) 1986-09-15 1987-09-10 Broyeur à agitateur

Country Status (2)

Country Link
EP (1) EP0260604B1 (fr)
DE (2) DE3631375A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4010926A1 (de) * 1990-04-04 1991-10-10 Fryma Masch Ag Ruehrwerksmuehle
EP0570854A2 (fr) * 1992-05-22 1993-11-24 Wendelin Kneisl Broyeur agitateur avec séparation dynamique des éléments broyeurs
GB2268426A (en) * 1992-07-07 1994-01-12 Joseph Miller Forrest Bead mill
WO2012083915A3 (fr) * 2010-12-04 2012-08-23 Netzsch-Feinmahltechnik Gmbh Élément dynamique conçu pour le dispositif de séparation d'un broyeur à boulets

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1757953A1 (de) * 1968-07-01 1971-06-16 Heidenau Maschf Veb Ruehrwerkskugelmuehle
DE1757942A1 (de) * 1967-07-01 1971-07-08 Vyzk Ustav Organ Syntez Vorrichtung zur Dispergierung fester Teilchen in trockenem Zustand auf hohe Feinheit
DE3245825A1 (de) * 1982-12-10 1984-06-14 Gebrüder Bühler AG, Uzwil Ruehrwerksmuehle
EP0146852B1 (fr) * 1983-12-16 1987-03-04 Gebrüder Netzsch Maschinenfabrik GmbH & Co Broyeur agitateur

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1757942A1 (de) * 1967-07-01 1971-07-08 Vyzk Ustav Organ Syntez Vorrichtung zur Dispergierung fester Teilchen in trockenem Zustand auf hohe Feinheit
DE1757953A1 (de) * 1968-07-01 1971-06-16 Heidenau Maschf Veb Ruehrwerkskugelmuehle
DE3245825A1 (de) * 1982-12-10 1984-06-14 Gebrüder Bühler AG, Uzwil Ruehrwerksmuehle
EP0146852B1 (fr) * 1983-12-16 1987-03-04 Gebrüder Netzsch Maschinenfabrik GmbH & Co Broyeur agitateur

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4010926A1 (de) * 1990-04-04 1991-10-10 Fryma Masch Ag Ruehrwerksmuehle
EP0570854A2 (fr) * 1992-05-22 1993-11-24 Wendelin Kneisl Broyeur agitateur avec séparation dynamique des éléments broyeurs
EP0570854A3 (fr) * 1992-05-22 1994-04-06 Wendelin Kneisl
GB2268426A (en) * 1992-07-07 1994-01-12 Joseph Miller Forrest Bead mill
GB2268426B (en) * 1992-07-07 1997-03-26 Joseph Miller Forrest Bead mill
WO2012083915A3 (fr) * 2010-12-04 2012-08-23 Netzsch-Feinmahltechnik Gmbh Élément dynamique conçu pour le dispositif de séparation d'un broyeur à boulets
CN103298561A (zh) * 2010-12-04 2013-09-11 耐驰粉磨技术有限责任公司 用于搅拌式球磨机的分离装置的动态元件
US8794558B2 (en) 2010-12-04 2014-08-05 Netzsch-Feinmahltechnik Gmbh Dynamic element for the separating device of a stirring ball mill
US8876028B2 (en) 2010-12-04 2014-11-04 Netzsch-Feinmahltechnik Gmbh Method for operating an agitator ball mill
CN103298561B (zh) * 2010-12-04 2015-08-26 Netzsch精细研磨技术有限公司 用于搅拌式球磨机的分离装置的动态元件

Also Published As

Publication number Publication date
DE3766329D1 (en) 1991-01-03
EP0260604A3 (en) 1989-02-22
DE3631375A1 (de) 1988-03-24
EP0260604B1 (fr) 1990-11-22

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