EP0439826B1 - Rührwerksmühle - Google Patents

Rührwerksmühle Download PDF

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Publication number
EP0439826B1
EP0439826B1 EP90125406A EP90125406A EP0439826B1 EP 0439826 B1 EP0439826 B1 EP 0439826B1 EP 90125406 A EP90125406 A EP 90125406A EP 90125406 A EP90125406 A EP 90125406A EP 0439826 B1 EP0439826 B1 EP 0439826B1
Authority
EP
European Patent Office
Prior art keywords
grinding
agitator
chamber
carrier
grinding 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.)
Expired - Lifetime
Application number
EP90125406A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0439826A1 (de
Inventor
Norbert Dr. Ing. Stehr
Philipp Schmitt
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.)
Draiswerke GmbH
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
Application filed by Draiswerke GmbH filed Critical Draiswerke GmbH
Priority to AT90125406T priority Critical patent/ATE98525T1/de
Publication of EP0439826A1 publication Critical patent/EP0439826A1/de
Application granted granted Critical
Publication of EP0439826B1 publication Critical patent/EP0439826B1/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

Definitions

  • the invention relates to an agitator mill according to the preamble of claim 1.
  • the grinding auxiliary bodies are centrifuged out of the material to be ground through the overflow channels before they reach the separating device.
  • the separating device now only has the function of collecting worn auxiliary grinding bodies that are too light to be thrown off directly through the overflow channels, and to serve as a throttle point for building up a counterpressure counteracting the grinding material flow.
  • the agitator is generally provided with agitating tools protruding into the outer grinding chamber or the inner grinding chamber in the manner of a peg.
  • stationary stirring tools protruding into the outer grinding chamber are arranged on the grinding container and stationary stirring tools protruding into the inner grinding chamber are also arranged on the inner stator. In this case, in order to ensure that the auxiliary grinding bodies are centrifuged out through the overflow channels, no stationary stirring tools are attached to the inner stator in the area in front of the overflow channels.
  • the invention has for its object to improve the known agitator mill of the generic type in such a way that even smaller grinding aids can be used to improve the grinding result and to increase the service life of the grinding aids without these being able to reach the separating device.
  • the driver provided and designed in accordance with the invention ensures that the entire material to be ground / grinding aid body in the area at or immediately before the inlet into the overflow channels is accelerated to the inner circumferential speed of the agitator, so that even the smallest particles whose density is greater than the density of the ground material, such as extremely small or worn auxiliary grinding bodies, through which overflow channels are thrown off.
  • the separating device is therefore also no longer subjected to such extremely small or worn grinding auxiliary bodies.
  • the smaller the auxiliary grinding media the better the quality of the ground material.
  • the lifespan of the entire agitator mill is increased with decreasing size of the auxiliary grinding bodies.
  • the development according to claim 2 ensures that the full extent of the respective inlets of the overflow channels in the direction parallel to the central longitudinal axis of the agitator mill in this area can not slow down the flow again.
  • an agitator mill which has a grinding chamber with a cylindrical inner wall and a cylindrical rotor, a grinding chamber being formed between the rotor and the inner wall of the grinding container.
  • the free end of the agitator has a cavity into which a separating device projects.
  • the agitator is provided with recesses all around the separating device, which allow the auxiliary grinding bodies which flow freely into the cavity together with the material to be ground to exit radially.
  • the recesses can be delimited by projections which extend approximately tangentially to the separating device designed as a sieve cartridge without fully reaching it.
  • the advantageous embodiment according to claim 3 ensures that the grinding aid bodies are centrifuged against the inner wall of the agitator even before the grinding material / auxiliary body flow arrives at the overflow channels, so that the auxiliary grinding bodies flow directly into the overflow channels when the overflow channels are reached.
  • the drivers are designed in particular according to claim 4. The higher the viscosity of the material to be ground, the longer it takes for the auxiliary grinding bodies to be centrifuged outwards. It follows that with increasing axial extension of the plate- or strip-shaped drivers, the toughness of the ground material to be treated can increase.
  • the further embodiment according to claim 6 reinforces the forced effect with which the auxiliary grinding bodies are centrifuged out of the inner grinding chamber into the overflow channels.
  • a forced guidance with acceleration of the auxiliary grinding bodies towards the overflow channel is already achieved in the inner grinding chamber.
  • the further embodiment according to claim 12 ensures that the regrind already freed from auxiliary grinding bodies is sheared immediately before the separating device and is thus liquefied. This also leads to the fact that ground material with a particularly high apparent toughness can be used without a considerable back pressure being built up in the area in front of the separating device. This increases the throughput of the agitator mill.
  • the further embodiment according to claim 13 ensures that, in the case of extremely sticky regrind, auxiliary grinding bodies cannot adhere to the driver in front of the overflow channel, which would make cleaning the machine more difficult.
  • the agitator mill shown in Fig. 1 has in the usual way a stand 1, on the top of which a projecting support arm 2 is attached, on the turn a cylindrical grinding container 3 is attached.
  • an electric drive motor 4 is accommodated, which is provided with a V-belt pulley 5, of which a V-belt pulley 8, which is non-rotatably connected to a shaft 7, can be rotatably driven via V-belts 6.
  • the grinding container 3 consists of a cylindrical inner cylinder 10, which surrounds a grinding chamber 9 and is surrounded by an essentially cylindrical outer jacket 11.
  • the inner cylinder 10 and the outer jacket 11 delimit a cooling space 12 between them.
  • the lower end of the grinding space 9 is formed by an annular base plate 13 which is fastened to the grinding container by means of screws 14.
  • the grinding container 3 has an upper ring flange 15, by means of which it is fastened to a cover 16 which closes the grinding chamber 9 by means of screws 17.
  • This lid 16 is attached to the underside of a support housing 18, which is attached with its upper end to the support arm 2 of the agitator mill.
  • the support housing 18 has a central cylindrical section 19 which is arranged coaxially to the central longitudinal axis 20 of the grinding container 3. This section 19 is penetrated by the shaft 7, which also runs coaxially to the axis 20, on which a rotor serving as an agitator 21 and located in the grinding chamber 9 is attached.
  • a regrind supply line 22 opens into the area of the central cylindrical section 19 of the support housing 18 adjacent to the milling chamber 9. Above the mouth of this feed line 22, ie between this feed line 22 and the support arm 2, a seal 23 is provided between the agitator 21 and the section 19, which prevents ground material from escaping upwards in the direction of the support arm 2.
  • Attached to the circular base plate 13 is an approximately pot-shaped cylindrical inner stator 24 which projects into the grinding chamber 9 and consists of a cylindrical outer jacket 26 which delimits the grinding chamber 9 and is coaxial with the axis 20o and a cylindrical inner jacket 27 which is also coaxial with the axis 20o. Outer jacket 26 and inner jacket 27 delimit a cooling chamber 28 between them.
  • the cooling chamber 28 is connected to a cooling chamber 29 in the base plate 13, to which cooling water is supplied via a cooling water supply connection 3o, which is discharged via an outlet connection (not shown). Cooling water is supplied to the cooling chamber 12 of the grinding container 3 via a cooling water supply connection 31, which is discharged via a cooling water discharge connection 32.
  • a separating device 34 On its upper end face 33 of the inner stator 24 located in the grinding chamber, a separating device 34 is arranged, which is connected to a ground material discharge line 35.
  • a regrind collecting funnel 36 is provided between the separating device 34 and the discharge line 35.
  • the drain line 35 is provided in the area of the base plate 13 with a handle 37, which in turn is provided with a fastening ring 38 which is detachably connected to the base plate 13 by means of screws 39 or the inner stator 24 which is firmly connected to the latter.
  • the separator 34 is opposite to the annular end face 33 of the inner stator 24 is sealed by means of a seal 40 and can be pulled out of the inner stator 24 together with the drain line 35 and the collecting funnel 36 after loosening the screws 39, for which purpose the handle 37 is used.
  • the separating device 34 can thus be pulled out of the grinding chamber 9 without the grinding auxiliary bodies 41 located therein having to be removed from the grinding chamber 9, since the filling of the grinding chamber 9 with these auxiliary grinding bodies 41 does not reach the front side 33 when the agitator 21 is not driven.
  • the basic structure of the agitator 21 is pot-shaped, ie it has an essentially cylindrical rotor 42 which has a cylindrical outer wall 43 and a cylindrical inner wall 44 which is arranged coaxially thereto and coaxially with the axis 20.
  • a cooling space 45 is formed between the outer wall 43 and the inner wall 44 of the rotor 42.
  • the rotor 42 is attached to a rotor base 46 which is connected to the shaft 7. The supply and discharge of cooling water to the cooling space 45 takes place via cooling water channels 47, 48 formed in the shaft 7.
  • the grinding chamber 9 is turned into a cylindrical outer grinding chamber 9 'on the one hand and an inside On the other hand divided, which are connected to one another by a deflection space 49 in the area of the base plate 13.
  • stirring tools 5o, 5oa formed above as pins are attached to the outer grinding chamber 9 'or the inner grinding chamber 9' '.
  • conveying devices 51 projecting inward toward the inner stator 24, for example provided with inclined surfaces, can be attached, by means of which the material to be ground and the auxiliary grinding bodies 41, with corresponding rotation of the agitator 21, move upward into the inner grinding chamber 9 ′′ in the direction be promoted to the separator 34.
  • the millbase flows through the millbase 9 in accordance with the flow direction arrows 52 coming from the millbase feed line 22 through a millbase feed chamber 53 between the rotor base 46 and the cover 16, the outer grinding chamber 9 'downwards, through the deflection chamber 49 radially inwards and from there through the inner grinding chamber 9 ′′ up to the separating device 34.
  • the outer grinding chamber 9 ′, the deflection chamber 49 and the inner grinding chamber 9 ′′ it becomes in a rotating driven agitator 21 in cooperation with the auxiliary grinding bodies 41 ground.
  • the ground material leaves the grinding chamber 9 through the separating device 34, from where it flows through the ground material discharge line 35.
  • the separating device 34 consists of a stack of annular disks 54, between each of which a gap 55 is left open, the width of which is smaller than the diameter of the smallest auxiliary grinding bodies 41 used, and as a rule is considerably smaller than half the diameter of the smallest grinding aid body 41 used.
  • This stack of washers 54 is closed at the end by an end plate 56.
  • a retaining ring 57 is provided towards the regrind collecting funnel 36, which is provided with slanted slots 58, by means of which it can be fastened on pins 59 attached to the inner stator 24 in the manner of a bayonet catch.
  • the separating device 34 consisting of the retaining ring 57, the washers 54, the end plate 56 and screws 57a connecting them together, can be easily detached from the collecting funnel 36 with the drain line 35 by pulling it out of the inner stator 24, as already described.
  • these overflow channels 6o - with respect to the direction of rotation 61 of the agitator 21 - run radially from the inside outward against the direction of rotation 61, so that the auxiliary grinding bodies 41 provided with a centrifugal acceleration in the inner grinding chamber 9 '' are thrown off or sucked through these overflow channels 6o and to be brought back into the regrind inlet.
  • drivers 62 are attached, the plate or. are formed like a strip. They cover the overflow channels 6o in the direction of the axis 2o and continue to extend into the inner grinding chamber 9 ′′ counter to the flow direction 52. Their width a radially to the axis 2o is somewhat smaller than the width b of the inner grinding chamber 9 ′′ radially to Axis 2o, so that there is only a small distance between the respective driver 62 and the inner stator 24.
  • a driver is provided in front of an overflow channel 6o as viewed in the direction of rotation 61. The respective driver can - just like the corresponding overflow channel 6o - as seen from the central longitudinal axis 2o run against the direction of rotation 61 of the agitator 21 to the outside.
  • the drivers 62 extend counter to the flow direction 52 into an area in which stationary stirring tools 5 aa are fastened to the inner stator 24. They can extend into the inner grinding chamber 9 ′′ over approximately 10% to 20% of the axial extent of the latter.
  • the material to be ground flows via a relatively narrow, annular, radially extending passage 63 into a narrow, ring-cylindrical antechamber 64 between the rotor base 46 and the separating device 34.
  • the separating device 34 can be dispensed with as a whole.
  • the agitator mill corresponds essentially to that of FIGS. 1 to 4.
  • identical parts with identical reference numerals and functionally identical, structurally but slightly different parts with the same reference number are denoted by a prime , although generally no new description is required; in this respect, reference can be made to the previous description.
  • the overflow channels 6o ' are arranged in the rotor 42' directly at the transition from the rotor base 46 'into the cylindrical region of the rotor 42'. They are - based on the central longitudinal axis 2o - in an area which is approximately radial to the separating device 34.
  • a driver 65 is arranged in front of an overflow duct 6o '.
  • the driver 65 has an approximately plate shape in its area located in the inner grinding chamber 9 ′′, its width a ′ increasing slightly radially to the axis 2o in the direction of flow 52, while the width b of the inner grinding chamber 9 ′′ radially to the axis 2o is essentially constant in this area.
  • the radial distance c of the inner surface 66 facing the inner stator 24 'from the inner stator 24' thus decreases in the direction of flow 52.
  • the leading driving surface 67 facing the overflow channel 6o ' runs parallel to the axis 2o.
  • This driving surface 67 extends - in the same way as the assigned overflow channel 6o 'and in the same way as in the exemplary embodiment according to FIGS. 1 to 4 - as seen from the central longitudinal axis 2o against the direction of rotation 61 of the agitator 21', as shown in FIG. 6 is removable.
  • the trailing rear 68 of the driver 65 opposite the driving surface 67 extends - as can be seen in FIG.
  • the radial width a 'of the driver 65 in the direction of the overflow channel 6o is larger, it is achieved that the material to be ground-grinding aid flow in flow direction 52 is increasingly set in rotation, this rotation seen in flow direction 52 due to the decrease in the distance c is increasingly enforced.
  • the risk of larger auxiliary grinding bodies 41 being squeezed in the area of the smallest distance c between the inner surface 66 of the driver 65 and the outer jacket 26 'of the inner stator 24' is therefore excluded.
  • the driver 65 is provided with a shear projection 7o.
  • This has a leading surface 71 which is approximately aligned with the driving surface 67 and a trailing surface 72 which runs radially outward counter to the direction of rotation 61. Adjacent to the penetration area 73 of the two surfaces 71, 72 is a shear area 74, in which the regrind already free from grinding auxiliary bodies 41 is sheared immediately before it passes through the separating device and is thus made less viscous. The exit of the ground material through the separating device 34 is thus facilitated.
  • the drivers 65 are each fastened to the rotor base 46 'with one or more screws 75.
  • FIGS. 8, 9 largely corresponds to that according to FIGS. 5 to 7. For this reason, identical reference numbers have been used for identical parts, and the same reference numbers with a raised double bar have been used for functionally identical, but structurally but slightly different parts that there is a new description requirement. In this respect, reference can be made to the previous description.
  • the overflow channels 6o ′′ extend in the direction of the axis 2o into the inner grinding chamber 9 ′′, specifically over the full axial extent of the drivers 65 ′′, as can be seen in FIG. 8.
  • the drivers 65 '' are formed in one piece with the rotor base 46 '', i.e. for example, the rotor base 46 ′′ with the drivers 65 ′′ and the overflow channels 6o ′′ is designed as a cast part.
  • the width a ′′ of the driver 65 ′′ does not increase radially to the axis 20 in the flow direction 52.
  • the radial distance c ′′ of the inner surface 66 ′′ of the driver 65 ′′ facing the inner stator 24 ′ from the inner stator 24 ′ is therefore constant in the flow direction 52 within the inner grinding chamber 9 ′′.
  • the width b of the inner grinding chamber 9 ′′ radial to the axis 2o is also essentially constant in this area.
  • the driving surface 67 '' facing the overflow channel 6o '' and leading in the direction of rotation 61 extends to the axis 2o and - just like the associated overflow channel 6o '- is inclined from the central longitudinal axis 2o against the direction of rotation 61 of the agitator 21'' towards the outside, as can be seen in FIG. 9.
  • the trailing rear side 68 ′′ of the driver 65 ′′ opposite the driving surface 67 ′′ runs — as can be seen in FIG. 9 — inclined upwards.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
EP90125406A 1990-01-30 1990-12-24 Rührwerksmühle Expired - Lifetime EP0439826B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90125406T ATE98525T1 (de) 1990-01-30 1990-12-24 Ruehrwerksmuehle.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4002613A DE4002613A1 (de) 1990-01-30 1990-01-30 Ruehrwerksmuehle
DE4002613 1990-01-30

Publications (2)

Publication Number Publication Date
EP0439826A1 EP0439826A1 (de) 1991-08-07
EP0439826B1 true EP0439826B1 (de) 1993-12-15

Family

ID=6399032

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90125406A Expired - Lifetime EP0439826B1 (de) 1990-01-30 1990-12-24 Rührwerksmühle

Country Status (7)

Country Link
US (1) US5133508A (enrdf_load_stackoverflow)
EP (1) EP0439826B1 (enrdf_load_stackoverflow)
JP (1) JPH0665386B2 (enrdf_load_stackoverflow)
AT (1) ATE98525T1 (enrdf_load_stackoverflow)
BR (1) BR9100367A (enrdf_load_stackoverflow)
DE (2) DE4002613A1 (enrdf_load_stackoverflow)
ES (1) ES2048951T3 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19834397B4 (de) * 1997-10-28 2007-04-05 BüHLER GMBH Rührwerksmühle
DE19819967B4 (de) * 1998-05-05 2007-04-26 BüHLER GMBH Rührwerksmühle

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19632757A1 (de) * 1996-08-14 1998-02-19 Draiswerke Gmbh Rührwerksmühle
DE19638354A1 (de) * 1996-09-19 1998-03-26 Draiswerke Inc Mahwah Rührwerksmühle
ES2195251T3 (es) * 1997-10-28 2003-12-01 Draiswerke Gmbh Molino con mecanismo agitador.
US6121344A (en) * 1998-06-19 2000-09-19 Kerr Corporation Optimum particle sized hybrid composite
US6300390B1 (en) 1998-06-09 2001-10-09 Kerr Corporation Dental restorative composite
DE29814714U1 (de) * 1998-08-17 1998-12-10 Draiswerke Gmbh, 68305 Mannheim Rührwerksmühle
RU2149059C1 (ru) * 1998-08-24 2000-05-20 Хвостенков Сергей Иванович Помольно-смесительный агрегат
US6010085A (en) * 1999-03-17 2000-01-04 Kerr Corporation Agitator mill and method of use for low contamination grinding
ES2245195B1 (es) * 2003-09-11 2007-02-16 Oliver Y Batlle, S.A. Molino agitador vertical.
JP2005319403A (ja) * 2004-05-10 2005-11-17 Chuo Kakoki Kk 液状原料の分散装置
JP4918226B2 (ja) * 2005-03-03 2012-04-18 日本コークス工業株式会社 メディア攪拌型湿式粉砕機
EP1724021A1 (de) * 2005-05-19 2006-11-22 Bühler AG Rührwerksmühle
ES2285603T3 (es) * 2005-05-19 2007-11-16 Buhler Ag Molino agitador.
JP2007229686A (ja) * 2006-03-03 2007-09-13 Mitsui Mining Co Ltd メディア攪拌型湿式分散機及び微粒子の分散方法
DE102013021757A1 (de) * 2013-12-20 2015-06-25 Netzsch Trockenmahltechnik Gmbh Maschine mit fliegend gelagertem Rotor
ES3031993T3 (en) * 2019-10-01 2025-07-14 Buehler Ag Agitator mill
US12194470B2 (en) 2020-03-27 2025-01-14 Buhler Ag Agitator ball mill

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0206207A2 (de) * 1985-06-18 1986-12-30 Erich Netzsch GmbH & Co. Holding KG Rührwerksmühle

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH535070A (de) * 1971-03-01 1973-03-31 Bachofen Willy A Fa Vorrichtung zum Feindispergieren von Suspensionen
DE3345680A1 (de) * 1983-12-16 1985-06-20 Gebrüder Netzsch, Maschinenfabrik GmbH & Co, 8672 Selb Ruehrwerksmuehle
EP0249879B1 (en) * 1986-06-20 1990-10-03 Inoue Seisakusho (Mfg) Co., Ltd. Dispersing and grinding apparatus
DE3716587C1 (de) * 1987-05-18 1988-04-28 Draiswerke Gmbh Ruehrwerksmuehle
DE3727863C1 (de) * 1987-08-20 1989-03-02 Netzsch Erich Holding Ruehrwerksmuehle mit Zufuehrrohr fuer Mahlkoerper

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0206207A2 (de) * 1985-06-18 1986-12-30 Erich Netzsch GmbH & Co. Holding KG Rührwerksmühle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19834397B4 (de) * 1997-10-28 2007-04-05 BüHLER GMBH Rührwerksmühle
DE19819967B4 (de) * 1998-05-05 2007-04-26 BüHLER GMBH Rührwerksmühle

Also Published As

Publication number Publication date
ATE98525T1 (de) 1994-01-15
DE4002613A1 (de) 1991-08-01
DE4002613C2 (enrdf_load_stackoverflow) 1991-10-10
BR9100367A (pt) 1991-10-22
ES2048951T3 (es) 1994-04-01
US5133508A (en) 1992-07-28
EP0439826A1 (de) 1991-08-07
JPH0665386B2 (ja) 1994-08-24
DE59003892D1 (de) 1994-01-27
JPH04215859A (ja) 1992-08-06

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