EP0504836A1 - Broyeur agitateur - Google Patents

Broyeur agitateur Download PDF

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Publication number
EP0504836A1
EP0504836A1 EP92104678A EP92104678A EP0504836A1 EP 0504836 A1 EP0504836 A1 EP 0504836A1 EP 92104678 A EP92104678 A EP 92104678A EP 92104678 A EP92104678 A EP 92104678A EP 0504836 A1 EP0504836 A1 EP 0504836A1
Authority
EP
European Patent Office
Prior art keywords
grinding
cavity
agitator
mill according
milling
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
EP92104678A
Other languages
German (de)
English (en)
Other versions
EP0504836B1 (fr
Inventor
Horst Pausch
Klaus Dipl.-Ing. Ott (Fh)
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 EP0504836A1 publication Critical patent/EP0504836A1/fr
Application granted granted Critical
Publication of EP0504836B1 publication Critical patent/EP0504836B1/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 residence time of the grinding media in the cavity around the separating device can be shortened in the known generic agitator mills by conveying elements which are fastened to the inner wall of the hollow end section of the agitator shaft and have, for example, the shape of a helix.
  • Such conveying elements are indeed suitable for accelerating the grinding media detected by them through the outlet openings in the hollow end section of the agitator shaft back into the grinding chamber, but they cannot prevent a part of the grinding media which have flowed axially into the cavity in the intended manner stays in the immediate vicinity of the separating device for an undesirably long time.
  • the invention is therefore based on the object, in a stirrer mill of the type described at the outset, to essentially control the grinding media millbase suspension flowing axially into the cavity in the end region of the stirrer shaft in such a way that even under difficult pressure and viscosity conditions the immediate vicinity of the separating device is largely kept free of grinding media accumulations.
  • the intermediate cage according to the invention has the desired effect in operation, particularly in the case of highly viscous regrind and high pressure gradients between the grinding chamber and the regrind outlet, that it improves the flowability of the regrind and thus its readiness to release the grinding media in the immediate vicinity of the separating device. So that the inner zone is at least largely kept free of grinding media, the deflector prevents the general grinding media millbase flow that has entered the cavity through the inner shaft end of the agitator shaft from direct access to the inner zone of the cavity.
  • the grinding media are prevented from entering the inner zone without exception. This can be the case in particular if the intermediate cage has a sieve whose mesh size is so small that grinding media, or the like through a gap. have accidentally entered the inner zone, cannot pass through the intermediate cage into the outer zone. In such cases, at least one outflow channel is provided for those grinding media that have entered the inner zone, through which these grinding media flow out of the inner zone either directly or via the outer zone into the grinding chamber.
  • the agitator mill shown in FIGS. 1 to 6 has an essentially cylindrical, horizontally arranged grinding container 12, which is removably attached to a bearing housing 14.
  • a gear housing 16 is also attached to the bearing housing 14, in which a controllable drive of a conventional type is accommodated.
  • the grinding container 12 contains a circular cylindrical grinding chamber 18 in which an agitator 20 is arranged.
  • the agitator 20 consists essentially of an agitator shaft 22, which is mounted in the bearing housing 14 and extends coaxially with the grinding container 12 through almost the entire grinding chamber 18, and a number of stirring elements 24.
  • the stirring elements 24 are rod-shaped in the example shown; they are fastened to the agitator shaft 22 at equal axial intervals and project into spaces between counter-bars 26 fastened to the grinding container 12.
  • a grinding material inlet 28 is arranged, through which a suspension or slurry of grinding material and liquid is continuously pumped into the grinding chamber 18 during operation.
  • a grinding material outlet 30 is arranged on the right-hand front side of the grinding container 12 facing away from the grinding material inlet 28 in FIG. 1, through which the finished grinding material continuously flows.
  • the regrind outlet 30 is formed by a threaded connector at the end of a tube 32 which is attached to a flange 34.
  • the flange 34 is screwed to an end wall 36 of the grinding container 12 facing away from the gear housing 16.
  • the tube 32 extends - coaxially with the agitator shaft 22 in the example shown - through the end wall 36 and the adjacent region of the grinding chamber 18 into a cavity 40 which begins at the inner shaft end 38 of the agitator shaft 22 and is open at the end or end.
  • the cavity 40 extends over almost the entire length of the main part of the stirring shaft 22 arranged in the grinding chamber 18.
  • a separating device 42 is arranged in the cavity 40.
  • the separating device 42 is formed by a cylindrical sieve cartridge which is coaxial with the agitator shaft 22 over a little more than a third of the Total length of the cavity 40 extends and has a distance from the inner shaft end 38 which is slightly more than half the total length of the cavity 40. This distance is bridged by a rotationally symmetrical insert 44 which is attached to the flange 34 and contains the tube 32.
  • slot-shaped, axially parallel outlet openings 46 are incorporated into the agitator shaft 22, which begin near the annular inner shaft end 38 and extend from there over the entire remaining length of the cavity 40.
  • the slot-shaped outlet openings 46 Viewed from the inner shaft end 38, the slot-shaped outlet openings 46 have a large width over approximately the first third of their total length and then a considerably smaller width over the rest of their total length; 2, the width of the outlet openings 46 in the first third of their total length is approximately 3: 1 in relation to the width over the entire rest of their total length.
  • the outlet openings 46 are narrow.
  • the outlet openings 46 are inclined backwards with respect to the direction of rotation of the agitator shaft 22 indicated in FIG. 2 by an arrow 48.
  • the grinding chamber 18 contains a mixture of grinding media 50 and grinding stock 52, which is activated during operation by rotating the agitator shaft 22 at a speed which is customary in agitator mills in the order of magnitude of, for example, 200 to 3000 revolutions per minute, depending on the nature of the grinding stock and Diameter of the agitator shaft and the grinding media.
  • the finished regrind 52 passes through the separating device 42 into the tube 32, while the grinding media 50 are retained and flow back into the grinding chamber 18 through the outlet openings 46. This backflow is promoted by centrifugal forces which result from the action of the inner wall of the stirring shaft 22 around the cavity 40 and the surfaces of the stirring shaft 22 delimiting the outlet openings 46 on the grinding media 50.
  • the agitator mill shown in FIGS. 1 to 6 has the following further features:
  • An annular deflector 54 is fastened to the insert 44 or, in an alternative, is formed in one piece.
  • the deflector 54 together with the inner wall of the agitator shaft 22, defines an annular constriction 56 which is at a distance from the inner shaft end 38 which approximately corresponds to the axial length of the wide sections of the outlet openings 46.
  • the constriction 56 contributes to the fact that a considerable part of the grinding media 50 is excreted from the grinding media grinding material suspension flowing within the cavity 40 before it reaches the part of the cavity 40 lying behind in the axial direction, to the left of the constriction 56 in FIG. 1 .
  • An intermediate cage 60 is arranged behind the deflector 54, to the left in FIG. 1 thereof, which forms the axially inner end of the cavity 40 with a base plate 62 formed thereon and is exchangeably fastened to the agitator shaft 22.
  • the intermediate cage 60 has passages 64, the shape and size of which, by changing the intermediate cage or individual parts thereof, the nature of the ground material 52 and the size of the grinding media 50 can be adjusted. 3 and 4 on the one hand and in FIGS. 5 and 6 on the other hand.
  • the width of the passages 64 is at most thirty times the largest diameter of the grinding media 50.
  • the intermediate cage 60 has an annular free cage end 66, the inner and outer walls of which are conical and converge towards the inner shaft end 38.
  • the insert 44 forms, together with the deflector 54, an annular groove of V-shaped profile facing away from the inner shaft end 38, into which the annular cage end 66 engages in such a way that an annular gap 68 is also formed of a V-shaped profile.
  • the apex region of the annular gap 68 lies approximately in the middle of the total axial length of the cavity 40 and has a width b which is preferably not more than ten times as large as the largest occurring diameter of the grinding media 50. In general, it is particularly advantageous if the width b is about three to five times as large as the largest grinding media diameter.
  • the intermediate cage 60 divides the part of the cavity 40 lying behind the deflector 54, seen from the inner shaft end 38, into an inner zone 70 and an outer zone 72, both of which are arranged in a ring and coaxially with the agitator shaft 22. With the specified dimensions of the passages 64 and the annular gap 68, the intermediate cage 60 does not rule out that grinding media 50 reach the inner zone 70 from the outer zone 72, although the relative grinding media density in the inner zone 70 will always be considerably lower than in the outer zone 72.
  • a plurality of outflow channels 74 are incorporated into the base plate 62 of the intermediate cage 60, 1 to 4 are offset in parallel by one radius each, whereas the outflow channels 74 in the embodiment shown in FIGS. 5 and 6 are arranged radially.
  • Each of the outflow channels 74 opens directly into one of the slot-shaped outlet openings 46 of the stirring shaft 22, so that the grinding media 50 are thrown out of the inner zone 70 in the shortest possible way into the grinding chamber 18.
  • the intermediate cage 60 has a conical inner wall 76, the inner diameter of which increases steadily in the direction of the outflow channels 74, ie away from the inner shaft end 38; in other words, the inner zone 70 widens towards the outflow channels 74. This expansion promotes the readiness of the grinding bodies 50 that have entered the inner zone 70, to the outflow channels 74, and then through these into the grinding chamber 18.
  • the intermediate cage 60 has four relatively wide axially parallel slots 78, which are enclosed by a cylindrical sieve 80.
  • the shape and size of the aforementioned passages 64 of the intermediate cage 60 are determined by the mesh of the sieve 80.
  • the intermediate cage 60 shown in FIGS. 5 and 6 has a plurality of rings 82 which are arranged concentrically to one another and are fastened to the base plate 62 by means of tie rods 84.
  • the rings 82 have interlocking conical sections 86, between which ring gaps remain free, which form the passages 64 of the intermediate cage 60.
  • the ring 82 furthest from the base plate 62 forms the annular free cage end 66.
  • the stirring shaft 22 can be heated or cooled as required; for this purpose channels 88 are provided which extend between the slot-shaped outlet openings 46 into the vicinity of the inner shaft end 38 and are connected via the bearing housing 14 to a heating and / or cooling device of a conventional type, not shown.
  • the insert 44 and the deflector 54 attached to it can be heated or cooled as required;
  • 44 channels 90 are formed in the insert, which are connected to the heating and / or cooling device via the flange 34.
  • the embodiment according to FIG. 7 differs from that shown in FIGS. 1 to 6 in that the intermediate cage 60 is not attached to the agitator shaft 20, but rather on the insert 44 or is formed integrally on it, and in that the insert 44 in the end wall 36 of the grinding container 12 is mounted coaxially with the agitator shaft 20 and is rotatable by means of its own rotary drive 92. There is a choice of several modes of operation.
  • the intermediate cage 60 can rotate in the same or opposite direction of rotation at the same or a different speed as the agitator shaft 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP92104678A 1991-03-21 1992-03-18 Broyeur agitateur Expired - Lifetime EP0504836B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4109332 1991-03-21
DE4109332A DE4109332A1 (de) 1991-03-21 1991-03-21 Ruehrwerksmuehle

Publications (2)

Publication Number Publication Date
EP0504836A1 true EP0504836A1 (fr) 1992-09-23
EP0504836B1 EP0504836B1 (fr) 1995-06-14

Family

ID=6427904

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92104678A Expired - Lifetime EP0504836B1 (fr) 1991-03-21 1992-03-18 Broyeur agitateur

Country Status (2)

Country Link
EP (1) EP0504836B1 (fr)
DE (2) DE4109332A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0700723A1 (fr) * 1994-09-09 1996-03-13 EVV-Vermögensverwaltungs-GmbH Broyeur agitateur
US5853132A (en) * 1996-03-06 1998-12-29 Fuji Photo Film Co., Ltd. Dispersing machine
WO2007042059A1 (fr) * 2005-10-11 2007-04-19 Bühler AG Broyeur melangeur
DE4307083B4 (de) * 1993-03-06 2007-07-12 Zoz Maschinenbau Gmbh Vorrichtung zur Feinstmahlung von Feststoffen
US7699250B1 (en) * 2007-03-02 2010-04-20 Progressive Industries, Inc. Media grinding mill
CN101884947B (zh) * 2005-10-11 2011-07-20 比勒股份公司 搅拌式研磨机
CN104053506A (zh) * 2012-07-05 2014-09-17 耐驰-康多克斯研磨技术有限责任公司 运行搅拌式球磨机的方法及执行该方法的搅拌式球磨机
WO2014187824A1 (fr) 2013-05-21 2014-11-27 Flsmidth A/S Procédés et appareil de surveillance en continu de l'usure dans des circuits de meulage
EP2886211A1 (fr) * 2013-12-20 2015-06-24 NETZSCH Trockenmahltechnik GmbH Machine dotée d'un rotor disposé en porte-à-faux
EP3536406A1 (fr) * 2018-03-07 2019-09-11 Bühler AG Moulin à agitateur

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4240779C1 (de) * 1992-12-04 1994-02-10 Netzsch Erich Holding Rührwerksmühle
DE102010049827A1 (de) * 2010-10-27 2012-05-03 Netzsch-Feinmahltechnik Gmbh Rührwerkskugelmühle
DE102018122395A1 (de) * 2018-09-13 2020-03-19 Netzsch Feinmahltechnik Gmbh Rührwelle für eine Rührwerkskugelmühle, Rührwerkskugelmühle und Verfahren zum Herstellen einer Rührwelle für eine Rührwerkskugelmühle
DE102021101527B4 (de) 2021-01-25 2023-05-17 Wilhelm Niemann Gmbh & Co. Rührwerksmühle

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0146852B1 (fr) * 1983-12-16 1987-03-04 Gebrüder Netzsch Maschinenfabrik GmbH & Co Broyeur agitateur

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0146852B1 (fr) * 1983-12-16 1987-03-04 Gebrüder Netzsch Maschinenfabrik GmbH & Co Broyeur agitateur

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4307083B4 (de) * 1993-03-06 2007-07-12 Zoz Maschinenbau Gmbh Vorrichtung zur Feinstmahlung von Feststoffen
EP0700723A1 (fr) * 1994-09-09 1996-03-13 EVV-Vermögensverwaltungs-GmbH Broyeur agitateur
US5853132A (en) * 1996-03-06 1998-12-29 Fuji Photo Film Co., Ltd. Dispersing machine
WO2007042059A1 (fr) * 2005-10-11 2007-04-19 Bühler AG Broyeur melangeur
EP1992412A1 (fr) * 2005-10-11 2008-11-19 Bühler Ag Moulin mélangeur agitateur
CN101287554B (zh) * 2005-10-11 2010-06-09 比勒股份公司 搅拌式研磨机
CN101884947B (zh) * 2005-10-11 2011-07-20 比勒股份公司 搅拌式研磨机
KR101128541B1 (ko) 2005-10-11 2012-03-23 뷔홀러 아게 교반기 밀
KR101230133B1 (ko) 2005-10-11 2013-02-05 뷔홀러 아게 교반기 밀
US7699250B1 (en) * 2007-03-02 2010-04-20 Progressive Industries, Inc. Media grinding mill
CN104053506A (zh) * 2012-07-05 2014-09-17 耐驰-康多克斯研磨技术有限责任公司 运行搅拌式球磨机的方法及执行该方法的搅拌式球磨机
WO2014187824A1 (fr) 2013-05-21 2014-11-27 Flsmidth A/S Procédés et appareil de surveillance en continu de l'usure dans des circuits de meulage
EP2886211A1 (fr) * 2013-12-20 2015-06-24 NETZSCH Trockenmahltechnik GmbH Machine dotée d'un rotor disposé en porte-à-faux
US20150174585A1 (en) * 2013-12-20 2015-06-25 Netzsch Trockenmahltechnik Gmbh Machine Having a Cantilever-Mounted Rotor
US11731139B2 (en) * 2013-12-20 2023-08-22 Netzsch Trockenmahltechnik Gmbh Machine having a cantilever-mounted rotor
EP3536406A1 (fr) * 2018-03-07 2019-09-11 Bühler AG Moulin à agitateur
WO2019170663A1 (fr) * 2018-03-07 2019-09-12 Bühler AG Broyeur agitateur
CN111801165A (zh) * 2018-03-07 2020-10-20 布勒股份公司 搅拌磨
JP2021515694A (ja) * 2018-03-07 2021-06-24 ビューラー・アクチエンゲゼルシャフトＢｕｅｈｌｅｒ ＡＧ アジテータミル
RU2754588C1 (ru) * 2018-03-07 2021-09-03 Бюлер Аг Бисерная мельница

Also Published As

Publication number Publication date
DE4109332C2 (fr) 1992-12-24
DE59202485D1 (de) 1995-07-20
DE4109332A1 (de) 1992-09-24
EP0504836B1 (fr) 1995-06-14

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