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EP0913200B1 - Rührwerksmühle - Google Patents

Rührwerksmühle Download PDF

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Publication number
EP0913200B1
EP0913200B1 EP98119177A EP98119177A EP0913200B1 EP 0913200 B1 EP0913200 B1 EP 0913200B1 EP 98119177 A EP98119177 A EP 98119177A EP 98119177 A EP98119177 A EP 98119177A EP 0913200 B1 EP0913200 B1 EP 0913200B1
Authority
EP
European Patent Office
Prior art keywords
grinding
grinding chamber
interior
chamber
exterior
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.)
Expired - Lifetime
Application number
EP98119177A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0913200A1 (de
Inventor
Norbert Dr. Stehr
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.)
Buehler AG
Original Assignee
Draiswerke 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
Priority claimed from DE19834397A external-priority patent/DE19834397B4/de
Application filed by Draiswerke GmbH filed Critical Draiswerke GmbH
Publication of EP0913200A1 publication Critical patent/EP0913200A1/de
Application granted granted Critical
Publication of EP0913200B1 publication Critical patent/EP0913200B1/de
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
    • B02C17/166—Mills in which a fixed container houses stirring means tumbling the charge of the annular gap type

Definitions

  • the invention relates to an agitator mill according to the preamble of Claim 1.
  • Such an agitator mill is known from DE 40 10 928 A1. at this known agitator mill have the outside grinding chamber and the Indoor grinding room - as far as can be seen from the drawing of this publication is - same radial extension.
  • the regrind flows through a regrind feed chamber, through a transition area on the overflow channels over into the outside grinding room and through the deflection room into the inside grinding room.
  • the grinding aids run in a circle through the outside grinding chamber, the deflection chamber, the inside grinding chamber and the overflow channels back into the outside grinding room or into the one opening into it Transition area.
  • the regrind flows from the end of the interior grinding chamber to the separator.
  • the separator is not used in noteworthy measure for separating grinding aids on the one hand and Regrind on the other hand; nevertheless - also in this application - the term Separating device used because it is general in the technical language has prevailed. As follows from the above explanation the separation of the auxiliary grinding bodies from the regrind before the separating device.
  • each frustoconical rejuvenate i.e. the cross section of the grinding room is on everyone Cone-shaped side of the central longitudinal axis of the rotor and stator.
  • the Grist flows through the agitator mill from the inside out, i.e. it flows into the narrow diameter of the inner grinding chamber, flows through it then the radially expanding inner grinding chamber, the deflection chamber and then the radially widening outside grinding room. From there it flows radially inwards through a one-sided boundary of the agitator Space to a separator through which the regrind is discharged becomes.
  • the entry of an overflow channel is arranged downstream of this separating device, the inlet of which is arranged radially inside the separating device, So this is subordinate. From there, the grinding aids flow through Overflow channels in the rotor in the initial area of the inner grinding chamber.
  • the boundary walls of the grinding chamber are smooth-walled.
  • the width of the grinding gap, i.e. the radial width of the grinding chamber is constant; the distance to However, the axis of rotation increases steadily. It follows from this that the shear gradient increases over the path of the regrind from the inside to the outside. this leads to to the fact that it is either too low in the inside grinding room or in the outside grinding room is too high, which leads to an uneven loading of the Grist leads. (The shear gradient is defined as the quotient of speed the rotating surface and gap width.)
  • an agitator mill is known, the one Has agitator shaft with a cage which is part of the agitator shaft.
  • the cage is attached to a support part, between and the lid of the grinding container and an adjacent area of the inner wall of the grinding container a friction gap is formed.
  • the regrind is in this friction gap by friction of the walls of the grinding container delimiting these friction gaps and the agitator shaft activated.
  • the invention is based, an agitator mill of the generic type Kind in such a way that on the one hand intensive crushing and dispersing the regrind particles is maintained; that the crushed Grist particles but get a finely smoothed surface.
  • Claim 4 gives preferred lower ranges for the ratio of the cross-sectional areas from outside grinding room and inside grinding room.
  • the requirements 4 and 5 give preferred upper limits for the ratio of Cross-sectional areas of the outside grinding area and inside grinding area.
  • claims 6 to 9 are preferred limit values for the radial width indicated by outside grinding room and inside grinding room.
  • Claim 11 reflects measures by which the impact grinding in the outer grinding chamber can be optimized.
  • the claims 11 to 15 indicate a further embodiment in which the Grist before entering the outside grinding area of a predispersion is subjected to a narrow ring-cylindrical vortex.
  • This Effect is brought about in particular by the fact that the ring-cylindrical Vortex gap a very small extension radially to the central longitudinal axis and that the overflow channels enter this vortex gap, so that alternating wall sections of the rotor delimiting the vortex gap and the outlet openings of the overflow channels on the inner wall of the Run past the grinding container.
  • the agitator mill shown in Fig. 1 has in the usual way Stand 1 on which a cylindrical grinding container 3 can be attached.
  • Stand 1 On which a cylindrical grinding container 3 can be attached.
  • an electric drive motor 4 which with a V-belt pulley 5 is provided, one of which via V-belt 6 a drive shaft 7 rotatably connected V-belt pulley 8 rotating is drivable.
  • the grinding container 3 consists of a cylindrical, a grinding chamber 9 surrounding inner wall 10, the a substantially cylindrical outer jacket 11 is surrounded.
  • the Inner cylinder 10 and the outer jacket 11 delimit one between them Cooling chamber 12.
  • the lower end of the grinding chamber 9 is by an annular Base plate 13 formed on the grinding container by means of screws 14 is attached.
  • the grinding container 3 has an upper ring flange 15, by means of which it is fastened to the underside of a support housing 16 by means of screws 17, which is attached to stand 1 of the agitator mill.
  • the grinding chamber 9 is closed by a lid 18.
  • the support housing 16 has a medium Bearing and seal housing 19, which is coaxial to the central longitudinal axis 20 of the grinding container 3 is arranged. This seal housing 19th is driven by the drive shaft 7, which also runs coaxially to the axis 20 enforced, on which an agitator 21 is attached.
  • a regrind feed line opens into the adjacent area of the seal housing 19 22 a.
  • the cooling space 28 is connected to a cooling space 29 in the base plate 13, the cooling water is supplied via a cooling water supply nozzle 30 which via an outlet pipe 30a is discharged.
  • the cooling chamber 12 of the grinding container 3 cooling water is supplied via a cooling water supply nozzle 31, which is discharged via a cooling water discharge nozzle 32.
  • a grinding aid-grinding body separating device 34 is arranged, which is connected to a regrind drain line 35. Between the separator 34 and the drain line 35 is a regrind collecting funnel 36 provided.
  • the drain line 35 is in the range of Base plate 13 provided with a bracket 38, which by means of screws 39 with the base plate 13 or the inner stator fixedly connected to it 24 is releasably connected.
  • the separator 34 is opposite to the annular end face 33 of the inner stator 24 by means of a seal 40 sealed and after loosening the screws 39 together with the Drain line 35 and the collecting funnel 36 from the inner stator 24 after pulled out below.
  • the separator 34 can thus from the Grinding chamber 9 are pulled out without the located in it Grinding auxiliary body 41 must be removed from the grinding chamber, since the Filling the grinding chamber 9 with these auxiliary grinding bodies 41 when not driven Agitator 21 does not reach the front side 33.
  • the basic structure of the agitator 21 is pot-shaped, i.e. it shows one essentially ring-cylindrical rotor 42 by a cylindrical Outer wall 43 and one arranged coaxially thereto and coaxially to the axis 20 cylindrical inner wall 44 is formed. Between the outer wall 43 and the inner wall 44 of the rotor 42, a cooling space 45 is formed.
  • the rotor 42 is attached to a rotor support member 46 which is connected to the Wave 7 is connected.
  • the supply and discharge of cooling water to the cold room 45 is carried out by trained in the shaft 7 and in the rotor support member 46 Cooling water channels 47, 48.
  • the grinding chamber 9 is in a cylindrical ring External grinding chamber 9 'on the one hand and a cylindrical ring Internal grinding chamber 9 ", on the other hand, divided by a deflection chamber 49 are connected to one another in the area of the base plate 13.
  • the ground material flows through the grinding chamber 9 in accordance with the flow direction arrows 52 coming from the regrind feed line 22 a regrind feed space 53 between the rotor support part 46 on the one hand and the cover 18 and the adjacent area of the inner wall 10 on the other hand, down through the outside grinding chamber 9 ', through the deflection chamber 49 radially inwards and from there through the inner grinding chamber 9 '' up to the separator 34.
  • the deflection chamber 49 and the inner grinding chamber 9 " Regrind with rotating driven agitator 21 in cooperation with the grinding auxiliary bodies 41 processed.
  • the ground material leaves the grinding chamber 9 through the separator 34, from where it goes through the regrind drain line 35 flows off.
  • the separating device used to separate auxiliary grinding bodies 41 34 is arranged in a cylindrical recess 54 of the rotor support part 46. Between the cylindrical wall 55 of the recess 54 and the Separating device 34 are elongated on wall 55 in cross section about triangular driver 56 attached, each between them in cross-section approximately funnel-shaped inlet areas for overflow channels 57 form. Such a configuration with such drivers 56 is out EP 0 439 826 B (corresponding to US Pat. No. 5,133,508).
  • the overflow channels 57 are located in the rotor support part 46, specifically in the Transition area of the rotor support part 46 to the cylindrical rotor 42 and - seen in the direction of flow direction arrows 52 - in front of the separator 34. They connect - based on the flow direction accordingly flow direction arrows 52 - the end of the interior grinding chamber 9 '' with the beginning of the outer grinding chamber 9 ', i.e. with a transition area 58 of the regrind supply space 53, which enters the outer grinding space 9 ' transforms.
  • the overflow channels 57 run in relation to the direction of rotation 59 of the agitator 21 - radially from the inside outward against the Direction of rotation 59, so that in the inner grinding chamber 9 "with a centrifugal acceleration provided auxiliary grinding body 41 through the overflow channels 57 thrown out and thus brought back into the regrind feed space 53 become.
  • the outer grinding chamber 9 ' is a real grinding chamber in which the auxiliary grinding bodies 41 are subjected to an intensive pulse exchange with the rotating stirring tools 51 and the stationary stirring tools 50 be, in which the regrind is subjected to an intensive shearing and dispersing process by impact effects.
  • the individual particles of the millbase fed in the form of a dispersion or suspension are intensively comminuted in the outer milling chamber 9 '.
  • the inner grinding chamber 9 is designed as a grinding gap, the cross-sectional area of which is considerably smaller than the cross-sectional area of the outer grinding chamber 9 '.
  • the outer grinding chamber 9' has an outer diameter Da and an inner diameter Di.
  • the inner grinding chamber which is designed as a grinding gap 9 "has an outer diameter da and an inner diameter di.
  • the flow rate of the material to be ground in the interior grinding space 9 ′′ is at least four or five times greater than in the outer grinding space.
  • Grinding chamber 9 'is correspondingly about d he is 4 or 5 times longer than the dwell time of the material to be ground in the inner grinding chamber 9 '' designed as a grinding gap.
  • the upper limit is a ⁇ 300 mm.
  • As the top Limit applies b ⁇ 15 mm. It applies that the gap width b at least in each case correspond to 4 times the diameter c of the auxiliary grinding bodies 41 should.
  • the upper limit for the diameter c of the auxiliary grinding body 41 is: c ⁇ 1.5 mm.
  • the deflection chamber 49 is oriented towards the inner grinding chamber provided continuously tapering acceleration section 60, which works like a nozzle.
  • the agitator mill described can be arranged vertically or horizontally become, as described - a vertical central-longitudinal axis 20 or have a corresponding horizontally arranged central longitudinal axis. Especially with a horizontal arrangement of the agitator mill the drivers 56 are not required. Otherwise, of course further constructive adjustment measures may be necessary.
  • the embodiment according to FIG. 3 differs from that according to FIG. 2 only by the configuration of the cylindrical peripheral wall 61 of the rotor support part 46's of the rotor 42 '. Between this peripheral wall 61 and the the associated inner wall 10 of the grinding container 3 is a swirl gap 62 formed into the frustoconical area of the regrind feed space 53 flows into.
  • the overflow channels 57 ' open into the vortex gap 62 a.
  • the gap width e of the swirl gap 62 radially to the central longitudinal axis 20 is very small. The following applies: 3 mm ⁇ e ⁇ 8 mm and particularly 4 mm ⁇ e ⁇ 5 mm.
  • the grinding auxiliary body 41 also applies to the ratio of the gap width e to the diameter c 3 c ⁇ e ⁇ 4 c.
  • the flow rate of the ground material is Vortex gap 62 in the direction of the outer grinding chamber 9 'is very high, so that a Escape of grinding aids 41 in the frustoconical area of the regrind feed space 53 is excluded.
  • those interrupted by the respective outlet 64 of the overflow channels 57 ' Wall sections 65 of the circumferential wall 61 with the as it were an overflow channels 57 'forming a recess will alternate an extremely intensive swirling of the auxiliary grinding body 41 achieves what for an extremely intensive predispersion of the ground material in the Vortex gap 62 leads.
  • This configuration therefore makes one extremely Effective series connection of predispersion, impact grinding and polishing grinding of the ground material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP98119177A 1997-10-28 1998-10-10 Rührwerksmühle Expired - Lifetime EP0913200B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19747474 1997-10-28
DE19747474 1997-10-28
DE19834397A DE19834397B4 (de) 1997-10-28 1998-07-30 Rührwerksmühle
DE19834397 1998-07-30

Publications (2)

Publication Number Publication Date
EP0913200A1 EP0913200A1 (de) 1999-05-06
EP0913200B1 true EP0913200B1 (de) 2003-04-23

Family

ID=26041142

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98119177A Expired - Lifetime EP0913200B1 (de) 1997-10-28 1998-10-10 Rührwerksmühle

Country Status (8)

Country Link
US (1) US5897068A (ja)
EP (1) EP0913200B1 (ja)
JP (1) JPH11197526A (ja)
CN (1) CN1101732C (ja)
BR (1) BR9804288A (ja)
ES (1) ES2195251T3 (ja)
RU (1) RU2155100C2 (ja)
TW (1) TW455508B (ja)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19819967B4 (de) * 1998-05-05 2007-04-26 BüHLER GMBH Rührwerksmühle
DE29814714U1 (de) * 1998-08-17 1998-12-10 Draiswerke Gmbh, 68305 Mannheim Rührwerksmühle
EP1867394A3 (en) * 2000-04-26 2008-03-05 Elan Pharma International Ltd. Apparatus for sanitary wet milling
ATE453454T1 (de) * 2000-04-26 2010-01-15 Elan Pharma Int Ltd Vorrichtung zur sanitären nassvermahlung
JP4451965B2 (ja) * 2000-05-18 2010-04-14 株式会社井上製作所 パイプラインビ−ズミル
ES2285603T3 (es) * 2005-05-19 2007-11-16 Buhler Ag Molino agitador.
KR100928076B1 (ko) * 2008-12-19 2009-11-23 (주)제이분체 나노 분쇄기
EP2393753B1 (en) 2009-02-03 2013-09-25 Timcal S.a. New graphite material
DE102010053484A1 (de) * 2010-12-04 2012-06-06 Netzsch-Feinmahltechnik Gmbh Dynamisches Element für die Trenneinrichtung einer Rührwerkskugelmühle
CN103418462B (zh) * 2012-05-18 2015-07-08 昆山市密友粉体设备工程有限公司 纳米级珠磨机结构以及环保型智能化珠磨机分散混合系统
CN103480463B (zh) * 2012-06-14 2015-01-28 谢小飞 一种离心式无隔网料珠分离介质搅拌磨
CN102814217A (zh) * 2012-08-31 2012-12-12 常州市龙鑫化工机械有限公司 一种高效再循环珠磨机
DE102013111762A1 (de) * 2013-07-08 2015-01-08 Netzsch-Feinmahltechnik Gmbh Rührwerkskugelmühle mit Axialkanälen
EP3799960B1 (de) 2019-10-01 2025-04-02 Bühler AG Rührwerksmühle
JP7454066B2 (ja) * 2020-03-27 2024-03-21 ビューラー アーゲー アジテータボールミル
PL4151314T3 (pl) * 2021-09-20 2024-05-13 Bühler AG Wirnik

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH618893A5 (ja) * 1977-04-29 1980-08-29 Buehler Ag Geb
DE2811899C2 (de) 1978-03-18 1984-12-06 Fryma-Maschinen Ag, Rheinfelden Spalt-Kugelmühle
DE3345680A1 (de) * 1983-12-16 1985-06-20 Gebrüder Netzsch, Maschinenfabrik GmbH & Co, 8672 Selb Ruehrwerksmuehle
DE3444575A1 (de) * 1984-12-06 1986-06-12 Fryma-Maschinen Ag, Rheinfelden Kugelmuehle
GB8431294D0 (en) * 1984-12-12 1985-01-23 Smidth & Co As F L Controlling intermittant voltage supply
DE3716587C1 (de) 1987-05-18 1988-04-28 Draiswerke Gmbh Ruehrwerksmuehle
DE3723558A1 (de) * 1987-07-16 1989-01-26 Netzsch Erich Holding Muehle, insbesondere ruehrwerksmuehle
DE3844380C1 (en) 1988-12-30 1990-01-18 Erich Netzsch Gmbh & Co Holding Kg, 8672 Selb, De Agitator mill with separating device in a rotating cage
DE4002613A1 (de) * 1990-01-30 1991-08-01 Draiswerke Gmbh Ruehrwerksmuehle
DE4010926A1 (de) * 1990-04-04 1991-10-10 Fryma Masch Ag Ruehrwerksmuehle
CH688849A5 (de) * 1993-02-25 1998-04-30 Buehler Ag Ruehrwerksmuehle.
JPH07328405A (ja) * 1994-06-06 1995-12-19 Mitsubishi Heavy Ind Ltd 湿式媒体分散装置
JPH08164342A (ja) * 1994-12-12 1996-06-25 Mitsubishi Heavy Ind Ltd ブレード型湿式媒体分散機
DE19632757A1 (de) * 1996-08-14 1998-02-19 Draiswerke Gmbh Rührwerksmühle

Also Published As

Publication number Publication date
BR9804288A (pt) 1999-12-07
ES2195251T3 (es) 2003-12-01
CN1101732C (zh) 2003-02-19
JPH11197526A (ja) 1999-07-27
RU2155100C2 (ru) 2000-08-27
US5897068A (en) 1999-04-27
EP0913200A1 (de) 1999-05-06
TW455508B (en) 2001-09-21
CN1215632A (zh) 1999-05-05

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