EP0700722A1 - Broyeur agitateur - Google Patents

Broyeur agitateur Download PDF

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Publication number
EP0700722A1
EP0700722A1 EP95113143A EP95113143A EP0700722A1 EP 0700722 A1 EP0700722 A1 EP 0700722A1 EP 95113143 A EP95113143 A EP 95113143A EP 95113143 A EP95113143 A EP 95113143A EP 0700722 A1 EP0700722 A1 EP 0700722A1
Authority
EP
European Patent Office
Prior art keywords
grinding
regrind
separating device
rotor
line
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.)
Withdrawn
Application number
EP95113143A
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German (de)
English (en)
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
Evv-Vermogensverwaltungs-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 Evv-Vermogensverwaltungs-Gmbh filed Critical Evv-Vermogensverwaltungs-Gmbh
Publication of EP0700722A1 publication Critical patent/EP0700722A1/fr
Withdrawn legal-status Critical Current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 according to the preamble of claim 1.
  • an agitator mill of the generic type in which the ground regrind together with auxiliary grinding bodies are removed from the grinding chamber by means of a screw conveyor and fed to a vibrating screen as a separating device.
  • the vibrating sieve the regrind together with grinding bodies that have become too small and fragments of grinding aid bodies are separated; the auxiliary grinding bodies, which still have a sufficient size, are fed to a mixing funnel, to which the millbase to be treated is fed by means of a millbase pump.
  • the ground material to be treated and the auxiliary grinding bodies are fed as a mixture via a line to a further screw conveyor, which feeds this mixture into the agitator mill.
  • the purpose of these measures is to be able to maintain a predetermined pressure in the grinding chamber.
  • the pressure in the grinding chamber should be influenced by changing the speed of the screw conveyors in front of the grinding chamber inlet and behind the grinding chamber outlet. This means that high regrind throughputs cannot be achieved.
  • this embodiment of the known agitator mill means that a reliable grinding aid circulation cannot be achieved.
  • the grinding aid bodies settle in the grinding aid body return line and remain there.
  • this type of agitator mills has not been able to prevail in practice since the Grinding aid circulation did not work.
  • a ball mill for dry grinding is known from US Pat. No. 2,595,117.
  • the ground material and the grinding media are discharged together through a discharge line and brought into a vertical air line that serves as an air classifier.
  • This vertical air line blows air from below, which conveys all smaller particles into a separator.
  • the grinding balls and large pieces of ground material fall down against the air flow and are conveyed back into the mill by means of a screw conveyor.
  • the separator again separates enough finely ground material and not yet ground enough ground material. The latter is also fed to the screw through a line.
  • EP 0 146 852 B1 discloses an agitator mill which has a grinding vessel with a cylindrical inner wall and a cylindrical agitator, a grinding chamber being formed between the agitator and the inner wall of the grinding vessel. At its free end, the agitator has a cavity into which a separating device projects. In this area the agitator is all around the separation device provided with recesses which allow the grinding auxiliary bodies which enter the cavity from the end face of the free shaft end to radially exit into the adjacent grinding chamber. There is a risk that in the area of the free shaft end, ie around the cavity, compression of auxiliary grinding bodies will occur.
  • the invention has for its object to design an agitator mill of the generic type so that a high regrind throughput is achieved.
  • the separating device Since the separating device has a drive which is separate from the drive of the agitator, high throughputs can be achieved in the grinding chamber, although a defined density of auxiliary grinding bodies can still be achieved in the grinding chamber.
  • the separate separating device can be designed and operated in such a way that the problems which otherwise occur in particular in the case of high throughputs in the agitator mill do not occur.
  • the auxiliary grinding media are transported hydraulically to the agitator mill by means of the as yet untreated ground material which serves as a transport medium.
  • the agitator mill can be operated reliably at high throughputs without the risk of blocking. Since the grinding aid body distribution in the grinding chamber is uniform due to the grinding aid circulation, a high reproducibility of the grind fineness is achieved at different throughputs, which can be very high overall.
  • a horizontal agitator mill 1 is shown.
  • This has a frame 2 in the usual way, which is supported on the floor 3.
  • a drive motor 4 which can be speed-controlled if necessary and which is provided with a V-belt pulley 5, of which a drive shaft 8 can be driven in rotation via V-belts 6 and a further V-belt pulley 7.
  • the drive shaft 8 is rotatably mounted in the frame 2 by means of several bearings 9.
  • a substantially cylindrical grinding container 11 is attached to a vertical end wall 10 of the frame 2.
  • the grinding container 11 has a cylindrical wall 12 and is closed at one end facing the wall 10 of the frame 2 by means of a cover 13 and at the opposite end by means of a base 14. It encloses a grinding room 15.
  • the grinding chamber 15 is sealed by means of seals 18 between the cover 13 and the agitator shaft 17.
  • the shaft 17 is overhung, that is, it is no longer supported in the region of the bottom 14. It is provided over its length in the grinding chamber 15 with stirring tools 19, which in the present case are stirring disks.
  • a feed pipe 20 opens into the grinding chamber 15, through which feed material to be treated is fed.
  • a discharge connection 21 opens out of the grinding chamber 15, which in the present exemplary embodiment is arranged concentrically to the axis 16 in the base 14.
  • the feed connector 20 is connected to a grinding material feed and grinding aid return line 22.
  • a regrind auxiliary body discharge line 23 connects to the discharge nozzle 21.
  • the regrind auxiliary body discharge line 23 leads from the agitator mill 1 to a separate regrind auxiliary body separating device 24.
  • This separating device 24 which is shown in detail in FIGS. 2 and 3, has a housing 25 which extends over part of the housing 25 forming base plate 26 is supported on a frame 27 only indicated. It has an essentially frustoconical shell 28 connected to the base plate 26, which is closed at its upper end opposite the base plate 26 by a cover plate 29.
  • a pot-like or cage-like rotor 31 is arranged in the housing 25 and can be driven in rotation about a vertical axis 32. An outer space 30 is formed between the rotor 31 and the housing 25.
  • the rotor 31 has a closed disk 33 which is fixedly connected to a hollow shaft 34.
  • This hollow shaft 34 passes through the base plate 26 and is rotatably supported thereon by means of a bearing 35.
  • the hollow shaft 34 and thus the rotor 31 are driven by a motor 36 by means of a V-belt drive 37 which engages the hollow shaft 34.
  • the rotor 31 also has a cylindrical wall 38 adjoining the disk 33. Passage channels 39 are formed in this cylindrical wall 38, which are designed to follow from the inside to the outside in relation to the direction of rotation 40 of the rotor 31, as can be seen in FIG. 3.
  • the channels 39 are closed at the open end of the rotor 31 by means of a ring 41 which closes off its cylindrical wall 38. This ring 41 is located directly adjacent to the cover plate 29.
  • a cylinder screen 44 which can be pulled out upwards and projects through the cover plate 29, projects into the interior 42 of the rotor 31 from above as a grinding aid retaining device 43.
  • a deflection disk 46 is attached to the disk 33, which extends into the vicinity of the cylindrical wall 38 and has a larger diameter a than the diameter b of the cylinder screen 44
  • Driving vanes 47 are attached to the outside of the cylindrical wall 38 of the rotor 31, which have the free cross section between the rotor 31 and fill base plate 26 and jacket 28 on the other hand, leaving a gap 48.
  • a grinding aid return pipe socket 49 opens out of the outer space 30 from the jacket 28.
  • this pipe socket 49 is guided essentially tangentially in a radial plane to the axis 32 from the outer space 30. It is arranged such that the direction of rotation 40 of the circumference of the wings 47 is directed tangentially into it.
  • This pipe socket 49 is designed as a pipe bend deflected by 90 °, which merges into the grinding material supply and grinding auxiliary body return line 22 which runs here in a straight line and parallel to the axis 32 and is arranged directly next to the housing 25. This line 22 leads to the feed connector 20 of the agitator mill 1.
  • a regrind feed line 51 opens into the pipe socket 49, aligned with the line 22, the inside diameter d of which is smaller than the inside diameter D of the regrind supply and grinding aid return line 22. In this way, a higher flow speed in the regrind feed line 51 is achieved compared to the flow speed in the line 22 and the pipe socket 49.
  • the grinding chamber 15 of the agitator mill 1 is filled to a considerable extent with auxiliary grinding bodies 52.
  • the regrind feed line 51 is fed in the usual manner by means of a regrind pump 53 regrind, which passes through the regrind feed and regrind auxiliary return line 22 and the regrind regrind supply feed pipe 20 curved through 180 ° into the grinding chamber 15 of the agitator mill 1 .
  • the grinding stock together with the auxiliary grinding bodies 52 is subjected to an intensive dispersing, grinding and shearing process by the high-speed stirring tools 19, this mixture flowing through the grinding chamber 15 in the direction of the discharge nozzle 21.
  • the discharge nozzle 21 is arranged concentrically to the central longitudinal axis 16, the grinding auxiliary bodies 52 are centrifuged to a large extent radially outwards due to their greater density than the material to be ground.
  • the treated regrind and a smaller proportion of auxiliary grinding bodies 52 therefore flow through the discharge nozzle 21 and through the regrind auxiliary grinding body discharge line 23 becomes the hollow shaft 34 of the separating device 24 fed.
  • the deflection disk 46 ensures that the material to be ground in the grinding aid is deflected radially outward, the material to be ground and auxiliary grinding element 52 being accelerated in the gap 55 between the disk 33 and the deflection plate 46 in the direction of rotation 40 of the rotor 31.
  • auxiliary grinding bodies 52 When the auxiliary grinding bodies 52 enter the interior 42 of the rotor 31 from the gap 55 adjacent to the cylindrical wall 38, they are flung radially outward to the axis 32 through the passage channels 39 into the outer space 30 of the housing 25 located outside the rotor 31.
  • the regrind on the other hand, is discharged through the cylinder screen 44 from the regrind auxiliary body separating device 24.
  • the grinding auxiliary bodies 52 thrown out of the rotor 31 are pressed into the pipe socket 49 by means of the vanes 47.
  • the above-described higher flow rate of the millbase in the millbase feed line 51 compared to the flow rate in the millbase feed and grinding aid body return line 22 results in a good distribution of the grinding aid bodies 52 in the millbase and thus a pronounced hydraulic transport of the grinding aid bodies 52 back to the agitator mill 1.
  • this higher flow rate prevents the auxiliary grinding bodies 52 from flowing back into the pipe socket 49.
  • FIGS. 4 and 5 show a further embodiment of a regrind auxiliary body separating device 24 '.
  • identical parts are present in this separating device 24 'with the separating device 24 according to FIGS. 2 and 3, identical reference numbers are used; Insofar as functionally identical but structurally different parts are provided, these are identified with identical reference numbers, but with a prime. Under no circumstances is a separate new description required.
  • the separating device 24 ' has a housing 25' with an essentially cylindrical jacket 28 '.
  • the regrind feed line 51 opens into the outer space 30 'of the housing 25' through a feed connector 56. Aligned with the feed connector 56, the casing 28 'of the housing 25' is provided with a bulge 57 which tapers towards the base plate 26 '.
  • a regrind outlet and grinding aid return pipe 58 opens out of the jacket 28 'from the outer space 30' of the housing 25 ', in the vicinity of the base plate 26'.
  • This nozzle 58 is - as can be seen in FIG. 5 - arranged tangentially to the direction of rotation 40.
  • the still untreated fresh regrind and the thrown-off auxiliary grinding bodies 52 are accelerated by the rotor 31 in the direction of rotation 40 and flow through the outer space 30 'approximately helically in the direction of the base plate 26', where they are pressed out of the separating device 24 'by the connecting piece 58. From here, the mixture of auxiliary grinding media 52 and untreated regrind is fed through the grinding material supply and auxiliary grinding body return line 22 to the agitator mill 1.
  • FIGS. 6 and 7 show a further embodiment of a regrind auxiliary body separation device 24 ′′.
  • identical parts are present with the previous embodiments, identical designations are used.
  • Functionally identical, but structurally different parts are identified with identical reference numbers but with a double prime. In this respect, a new description is not required.
  • the rotor 31 ′′ is attached to a solid shaft 59, which is driven directly by a motor 36.
  • the regrind from the agitator mill 1 leads to a discharge body 23 via a feed pipe 60 into the outer space 30 ′′ of the housing 25 ′′, radially to the axis 32 and parallel and adjacent to the base plate 26 ′′.
  • the rotor 31 ′′ has a length c which is greater than the length e of an outlet opening 61 which opens into the grinding aid return pipe socket 49 ′′.
  • the outer space 30 '' is in the area between the rotor 31 '' and the casing 28 ′′ is designed as an annular space 62, the radial extent of which is 10 to 50 mm.
  • the mixture of treated regrind and auxiliary grinding bodies 52 coming from the agitator mill 1 flows into the outer space 30 ′′ between the disk 33 ′′ and the base plate 26 ′. This mixture is accelerated in the direction of rotation 40.
  • the auxiliary grinding bodies 52 are flung through the outlet opening 61 into the auxiliary grinding body return pipe socket 49 ′′; the ground material passes through the passage channels 39 of the rotor 31 ′′ into its interior 42 and flows out through the cylinder sieve 44.
  • FIGS. 8 and 9 show a further embodiment of a regrind auxiliary body separating device 24 '' ', which in many areas corresponds structurally to the separating device 24' 'according to FIGS. 6 and 7. Identical parts are therefore identified with identical reference numerals and functionally identical, but structurally but other parts with the same reference numerals, which are provided with a triple prime. There is no need for a renewed description.
  • the grinding aid outlet opening 61 '' ' is located in the upper region in the cover plate 29' ''.
  • the annular space 62 '' 'between the rotor 31' 'and the cylindrical casing 28' 'is larger than in the separating device 24' 'according to FIGS. 6 and 7, i.e. the radial extent f '' 'of the annular space 62' '' radial to the axis 32 is 25 to 100 mm.
  • the grinding aid body outlet opening 61 '' ' is followed by a grinding aid body return pipe socket 49' '' designed as a 180 ° pipe elbow.
  • the mixture of treated ground material and auxiliary grinding bodies 52 coming from the agitator mill 1 flows through the Outside space 30 '''between the disk 33''of the rotor 31''and the base plate 26''and is accelerated in the direction of rotation 40 and enters the relatively wide annular space 62'''.
  • the treated regrind passes through the passage channels 39 into the interior 42 of the rotor 31 ′′ and flows out through the cylinder sieve 44.
  • the auxiliary grinding bodies 52 are discharged from the outer space 30 '''through the outlet opening 61''' and fed to the hydraulic return transport to the agitator mill 1 via the pipe socket 49 '''.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP95113143A 1994-09-09 1995-08-22 Broyeur agitateur Withdrawn EP0700722A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4432200 1994-09-09
DE4432200A DE4432200C1 (de) 1994-09-09 1994-09-09 Rührwerksmühle

Publications (1)

Publication Number Publication Date
EP0700722A1 true EP0700722A1 (fr) 1996-03-13

Family

ID=6527852

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95113143A Withdrawn EP0700722A1 (fr) 1994-09-09 1995-08-22 Broyeur agitateur

Country Status (11)

Country Link
US (1) US5624080A (fr)
EP (1) EP0700722A1 (fr)
JP (1) JPH0889834A (fr)
CN (1) CN1119558A (fr)
AU (1) AU3026495A (fr)
BR (1) BR9503977A (fr)
CA (1) CA2157703A1 (fr)
DE (1) DE4432200C1 (fr)
FI (1) FI954133A (fr)
NO (1) NO953519L (fr)
ZA (1) ZA957580B (fr)

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19630186B4 (de) * 1996-07-26 2007-11-15 BüHLER GMBH Rührwerksmühle
DE19635500B4 (de) * 1996-09-03 2008-01-10 Zoz Gmbh Vorrichtung zur Hochenergie- und/oder Feinstmahlung von Feststoffen und Verfahren zu dessen Betrieb
DE19839210B4 (de) 1998-08-28 2007-09-06 BüHLER GMBH Rührwerksmühle
DE10253791A1 (de) * 2001-12-24 2003-07-03 Gustav Eirich Gmbh & Co Kg Rührwerksmühle
WO2004020098A1 (fr) * 2002-08-28 2004-03-11 Bühler AG Moulin a billes a agitateur
DE10338592A1 (de) * 2003-08-22 2005-03-17 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Rührwerksmühle
JP4423500B2 (ja) * 2004-06-17 2010-03-03 関西ペイント株式会社 アニュラー型ビーズミル、該ビーズミルを備える顔料分散システム、及び該顔料分散システムを用いた顔料分散方法
NZ545960A (en) * 2006-03-15 2008-04-30 Environmental Decontamination Milling apparatus
JP5248801B2 (ja) * 2007-04-11 2013-07-31 日本コークス工業株式会社 粉砕分散処理システム
DE102007037446B3 (de) * 2007-08-08 2009-04-09 Netzsch-Feinmahltechnik Gmbh Rührwerksmühle
EP2246113A1 (fr) * 2009-04-29 2010-11-03 Sandvik Intellectual Property AB Processus pour le broyage de cermet ou mélanges de carbure cimenté
DE102010052656A1 (de) 2010-11-26 2012-05-31 Netzsch-Feinmahltechnik Gmbh Hydraulische Mahlkugel Zu- und Abfuhr für Rührwerkskugelmühlen
WO2012123347A2 (fr) * 2011-03-11 2012-09-20 Willy A. Bachofen Ag Broyeur à billes agité
DE102012013279A1 (de) * 2012-07-05 2014-01-09 Roland Nied Verfahren zum Betrieb einer Rührwerkskugelmühle sowie Rührwerkskugelmühle dafür
DE102013021756A1 (de) * 2013-12-20 2015-06-25 Netzsch Trockenmahltechnik Gmbh Mahlkörpermühle und Betriebsverfahren dafür
DE102013021757A1 (de) * 2013-12-20 2015-06-25 Netzsch Trockenmahltechnik Gmbh Maschine mit fliegend gelagertem Rotor
CN104971799A (zh) * 2014-04-03 2015-10-14 无锡赫达科技有限公司 一种环隙式纳米砂磨机
DE102014117191B3 (de) 2014-11-24 2016-05-12 Netzsch-Feinmahltechnik Gmbh Verfahren zum Regulieren der Trennwirkung einer Trennvorrichtung und Trennvorrichtung
DE102014117188B3 (de) * 2014-11-24 2016-05-12 Netzsch-Feinmahltechnik Gmbh Verfahren zum Regulieren der Förderleistung eines Rotors einer Trenneinrichtung einer Rührwerkskugelmühle und Rührwerkskugelmühle zum Zerkleinern von Mahlgut
CN105689060A (zh) * 2016-04-11 2016-06-22 上海儒特机电设备有限公司 一种外置出料的研磨机
CN106000152A (zh) * 2016-06-30 2016-10-12 宜兴市前成生物有限公司 一种用于氨基酸搅拌器中的搅拌叶
CN106111268B (zh) * 2016-07-09 2019-10-18 宝应县有机食品质量监督检验中心 一种梭形浆片的研磨化工机械系统
CN106179628B (zh) * 2016-07-09 2019-07-12 青岛大学 一种具有大小两种珠体的研磨化工机械系统
CN106111270B (zh) * 2016-07-09 2018-04-13 青岛大学 一种多浆片的研磨化工机械系统
CN106179627B (zh) * 2016-07-09 2019-07-12 青岛大学 一种送料速度模糊控制的研磨化工机械系统
DK3311921T3 (en) * 2016-10-18 2019-01-14 Bachofen Willy A Ag Stirring Ball Mill
BR102018009587A2 (pt) 2018-05-11 2019-11-26 Metso Brasil Industria E Comércio Ltda. Sistema de alimentação de corpos de cominuição em moinhos verticais
CN113843024A (zh) * 2021-10-13 2021-12-28 潍坊学院 一种塑料添加剂生产研磨装置
WO2024200024A1 (fr) 2023-03-31 2024-10-03 Bühler AG Broyeur à billes à agitateur avec séparation externe de milieux de broyage

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2595117A (en) 1950-03-08 1952-04-29 Smidth & Co As F L Method and apparatus for grinding
DE3038794A1 (de) 1980-10-14 1982-05-27 Gebrüder Bühler AG, 9240 Uzwil Ruehrwerkskugelmuehle
EP0058886A2 (fr) 1981-02-19 1982-09-01 Draiswerke GmbH Broyeur agitateur
EP0146852A1 (fr) 1983-12-16 1985-07-03 Gebrüder Netzsch Maschinenfabrik GmbH & Co Broyeur agitateur
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
DE4025987A1 (de) * 1990-08-16 1992-02-20 Buehler Ag Ruehrwerksmuehle

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4062497A (en) * 1976-07-01 1977-12-13 Application Dynamics, Inc. Grinding mill system having proportioning feeder

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2595117A (en) 1950-03-08 1952-04-29 Smidth & Co As F L Method and apparatus for grinding
DE3038794A1 (de) 1980-10-14 1982-05-27 Gebrüder Bühler AG, 9240 Uzwil Ruehrwerkskugelmuehle
EP0058886A2 (fr) 1981-02-19 1982-09-01 Draiswerke GmbH Broyeur agitateur
US4496106A (en) 1981-02-19 1985-01-29 Draiswerke Gmbh Agitator-grinder
EP0146852A1 (fr) 1983-12-16 1985-07-03 Gebrüder Netzsch Maschinenfabrik GmbH & Co Broyeur agitateur
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
DE4025987A1 (de) * 1990-08-16 1992-02-20 Buehler Ag Ruehrwerksmuehle

Also Published As

Publication number Publication date
NO953519L (no) 1996-03-11
US5624080A (en) 1997-04-29
BR9503977A (pt) 1996-09-24
CA2157703A1 (fr) 1996-03-10
NO953519D0 (no) 1995-09-07
FI954133A0 (fi) 1995-09-04
ZA957580B (en) 1996-04-15
JPH0889834A (ja) 1996-04-09
DE4432200C1 (de) 1996-02-29
FI954133A (fi) 1996-03-10
AU3026495A (en) 1996-03-21
CN1119558A (zh) 1996-04-03

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