EP0376001B1 - Rührwerksmühle mit Trennvorrichtung in einem rotierenden Käfig - Google Patents

Rührwerksmühle mit Trennvorrichtung in einem rotierenden Käfig Download PDF

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Publication number
EP0376001B1
EP0376001B1 EP89122340A EP89122340A EP0376001B1 EP 0376001 B1 EP0376001 B1 EP 0376001B1 EP 89122340 A EP89122340 A EP 89122340A EP 89122340 A EP89122340 A EP 89122340A EP 0376001 B1 EP0376001 B1 EP 0376001B1
Authority
EP
European Patent Office
Prior art keywords
zone
agitator mill
grinding
cage
inlet
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
EP89122340A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0376001A1 (de
Inventor
Erwin Weber
Giacomo Dr. Canepa
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
Priority claimed from DE19883844380 external-priority patent/DE3844380C1/de
Application filed by Erich Netzsch GmbH and Co Holding KG filed Critical Erich Netzsch GmbH and Co Holding KG
Publication of EP0376001A1 publication Critical patent/EP0376001A1/de
Application granted granted Critical
Publication of EP0376001B1 publication Critical patent/EP0376001B1/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
    • B02C17/161—Arrangements for separating milling media and ground material

Definitions

  • the invention relates to an agitator mill with a grinding container and an agitator shaft rotatably arranged therein, which jointly delimit a grinding chamber, a grist inlet, a cage which rotates as part of the agitator shaft and is open at one end, and a separating device which in the Cage is arranged, holds back unprocessed regrind and any auxiliary grinding media contained in the grinding chamber, but allows processed regrind to flow out to a regrind outlet, the grinding chamber being subdivided into an inlet zone which adjoins the regrind inlet and at least for a substantial part of its length from the agitator shaft is axially penetrated, and a separation zone which adjoins the inlet zone in the axial direction and is arranged around the cage.
  • the separation zone extends over a maximum of 25% of the total length of the grinding chamber; at least 75% of this total length is taken up by the inlet zone.
  • the separating device has an effective surface, the size of which is generally between 5% and 10% of the size of the inner surface of the grinding container which delimits the grinding chamber. Consequently the separator significantly inhibits the discharge of the ground material from the grinding chamber.
  • the speed component of the regrind flow in the axial direction of the grinding container is therefore relatively low, and there is a high probability that each individual particle of the regrind is crushed to the desired size on the long way between the regrind inlet and the separating device.
  • the throughput per unit of time is not too great for a given size of the known mill. This is particularly evident in cases in which a single pass of the millbase through the grinding chamber of an agitator mill is not sufficient to achieve the desired size reduction, and it is therefore necessary to either pump the millbase several times through the grinding chamber or to pump it several times pump back and forth between a storage container and the grinding chamber.
  • the invention is based on the object of substantially increasing the size reduction per unit time in an agitator mill and thereby achieving a particularly uniform size reduction of the ground material.
  • the object is achieved based on an agitator mill of the type described above in that the separation zone extends over 40% to 80% of the total length of the grinding chamber and the separating device has an effective area, the size of which is at least 20% of the inner surface of the grinding container delimiting the grinding chamber is.
  • the effective area of the separating device is to be understood as that surface of the separating device which is provided with meshes or with annular gaps located between separating rings.
  • An agitator mill according to the invention is flowed through relatively quickly because of the relatively long length of the separation zone and the relatively large effective area of the separation device, so that for each individual regrind particle the likelihood of being sufficiently comminuted in a single pass through the grinding chamber is low. Therefore, the individual particles of the material to be ground have to be conveyed through the grinding chamber much more frequently than in known generic agitator mills before they have undergone the desired comminution. Surprisingly, it has been found that the agitator mill according to the invention can nevertheless achieve a significantly higher comminution performance than in known generic agitator mills. The uniformity of the shredding is further increased. Because of the short average residence time of the individual regrind particles in the agitator mill, the risk of the regrind being damaged by overheating is generally lower than in the prior art.
  • Each of the agitator mills shown has an essentially cylindrical grinding container 10, in which a stirring shaft 12 is mounted coaxially, as well as a grinding material inlet 14 and a separating device 16, to which a grinding material outlet 18 connects.
  • a grinding chamber 20 is formed between the grinding container 10 and the stirring shaft 12 each of the agitator mills shown includes an inlet zone 22 and a separation zone 24.
  • the inlet zone 22 contains the regrind inlet 14 (FIGS. 1 and 7 to 11) or it adjoins this in the axial direction (FIGS. 2 to 6).
  • the separation zone 24 follows the inlet zone 22 in the axial direction and is arranged around a cage 25 which is formed on the agitator shaft 12, is at least approximately cylindrical, encloses the separation device 16 and is open at one end at the end.
  • the length of the separation zone 24 is the same as the length of the cage 25.
  • the separating device 16 can be formed by individual separating rings or a mesh screen, is at least approximately cylindrical in all the examples shown and has an effective length which corresponds at least approximately to the length of the cage 25 and thus also to the length of the separating zone 24.
  • the length of the separating device 16, measured in the axial direction of the agitator shaft 12, is approximately half (FIGS. 1 to 8, 10 and 11) to two thirds (FIG. 9) of the total length of the grinding chamber 20. That for the throughput relevant active lateral surface of the separating device 16 has an outer diameter which is only slightly smaller than the inner diameter of the cage 25.
  • the product length by diameter of the active outer surface of the separating device 16 is approximately 20% to 25% of the product length by diameter of the inner outer surface of the grinding container 10.
  • the agitator mills shown in FIGS. 1 to 5 and in FIGS. 7 to 11 are arranged horizontally, that is to say with a horizontal agitator shaft 12; 6, on the other hand, a standing agitator mill is shown.
  • the regrind inlet 14 is formed by bores in the agitator shaft 12.
  • the agitator shaft 12 is slim; its outside diameter is about a quarter to a third of the inside diameter of the grinding container 10. Towards the end of the inlet zone 22, the outside diameter of the stirring shaft 12 increases steadily to approximately two thirds of the inside diameter of the grinding container 10; the agitator shaft 12 maintains this large diameter in the separation zone 24.
  • the part of the agitator shaft 12 arranged in the inlet zone 22 carries agitator elements 26; 1, these are formed by long radial pins which extend up to close to the cylindrical inner wall of the grinding container 10.
  • the cage 25 of the agitator shaft 12 arranged in the separation zone 24 also carries agitator elements 28 which, however, are formed by short radial pins.
  • the grinding chamber 20 is, as indicated in FIG. 1, partially filled with regrind 30 and auxiliary grinding bodies 32.
  • the cage 25 has slots 34 which are parallel to the axis and is open on its end face facing the regrind outlet 18.
  • the separating device 16 is formed by a cylindrical sieve which is arranged coaxially with the stirring shaft 12 and is fastened to the grinding container 10.
  • a packing 36 is arranged coaxially with it, which leaves a relatively narrow annular space 38, which widens towards the grinding material outlet 18, between itself and the separating device 16.
  • Processing of the grinding stock 30 takes place predominantly in the inlet zone 22, in which the auxiliary grinding bodies 32 are strongly activated by the long stirring elements 26.
  • the regrind inlet 14 is not endangered because of its relatively protected arrangement from fast moving Grinding auxiliary bodies 32 are hit in considerable numbers and are therefore quickly worn out.
  • the short stirring elements 28 in the separation zone 24 essentially only have the task of avoiding or loosening up aggregates of auxiliary grinding bodies 32.
  • the ground material 30 mixed with auxiliary grinding bodies 32 flows from the inlet zone 22 through the separation zone 24 and passes through the open end face of the agitator shaft 12 into its cage 25. From there, the processed ground material 30 flows through the separating device 16 and the annular space 38 to the ground material outlet 18.
  • the auxiliary grinding bodies 32 are thrown outwards through the slots 34 and then repeat their cycle.
  • the agitator mill according to FIG. 2 differs from that shown in FIG. 1 essentially in that the ground material inlet 14 is arranged on the end of the grinding container 10 and opens directly into the grinding chamber 20. Furthermore, counter elements 40 in the form of radial pins are attached to the cylindrical inner wall of the grinding container 10 in the inlet zone 22 and extend between the stirring elements 26 to close to the stirring shaft 12.
  • the agitator shaft 12 contains an axial coolant channel 42; this extends from the drive-side end of the agitator shaft 12 on the left in the drawings into the filler body 36 which, according to FIG. 2, is formed in one piece with the agitator shaft 12 or is fastened to it.
  • the separating device 16 is again a cylindrical sieve according to FIG. 2, but, in contrast to FIG. 1, is not attached to the grinding container 10 but to the stirring shaft 12, so that the separating device 16 rotates together with the stirring shaft 12.
  • 22 stirring elements 26 are attached to the agitator shaft 12 in the inlet zone, which are circular or else non-circular disks are formed.
  • the separating device 16 is, to the extent that it corresponds to FIG. 1, attached to the grinding container 10, but is formed according to FIG. 3 by a ring arrangement with radial gaps arranged between the individual rings.
  • the stirring shaft 12 is not provided with stirring elements; the cage 25 arranged around the separating device 16, however, because of its slots 34, ensures sufficient movement of the grinding material 30 and grinding auxiliary bodies 32 in the separation zone 24 for different types of grinding material.
  • the embodiment according to FIG. 4 differs from that shown in FIG. 3 primarily in that in the inlet zone 22 on the grinding container 10 between the disk-shaped stirring elements 26 are fixed counter-elements 40 which, as in FIG. 2, are formed by radial rods. 4, the stirrer shaft 12 has a solid shaft core 44, on which the disk-shaped stirrer elements 26, a spacer sleeve 46 arranged between them and a hollow shaft part 48 supporting the cage 25 are attached.
  • the outer contours of the agitator shaft 12 are the same as in FIG. 4 as in FIG. 3; the left-hand disc-shaped stirring element 26 in FIG.
  • the separating device 16 is designed as in FIGS. 3 and 4, but according to FIG. 5 it only has the task of retaining coarse regrind particles and only allowing processed regrind to reach the regrind outlet 18.
  • the agitator shaft 12 is overhung in all the examples shown; A bearing 52 and shaft seal 54 is therefore only, as indicated, arranged at one end of the grinding container 10. At this end or in the vicinity thereof, a drive of conventional design is coupled or can be coupled to the agitator shaft 12.
  • the separating device 16 is arranged in each of the agitator mills shown in FIGS. 1 to 5 and in FIGS. 7 to 11 in the half of the grinding container 10 remote from the drive and bearing 52.
  • the separating device 16 is arranged in the drive-side half of the grinding container 10 and connected to the grinding material outlet 18 via a discharge chamber 56 which adjoins the shaft seal 54.
  • the stirring elements 26 are accordingly attached to or in the vicinity of the free end of the stirring shaft 12.
  • the agitator shaft 12 is slim only in the area of the bearing 52 and shaft seal 54 up to the beginning of the inlet zone 22; here it has a diameter of the order of a quarter to a third of the inside diameter of the grinding container 10.
  • a cone 58 belonging to the agitator shaft 12 begins, which has a complementarily conical inner end wall 60 of the grinding container 10 conical friction gap 62 limited.
  • the conical friction gap 62 is followed by a cylindrical friction gap 64 of approximately the same width, which extends to the end of the inlet zone 22.
  • the ground material 30 is activated in the friction gaps 62 and 64 by friction between the walls of the grinding container 10 and the agitator shaft 12 that delimit these friction gaps.
  • the agitator shaft 12 In the separation zone 24, around the separation device 16, the agitator shaft 12 has an outer diameter that is slightly smaller than the largest diameter of the cone 58.
  • Fig. 8 agrees with Fig. 7 in that the outer diameter of the agitator shaft 12 increases axially within the shaft seal 54 at a short distance.
  • the stirring shaft 12 has an outer diameter which is approximately two thirds of the inner diameter of the grinding container 10.
  • the stirring shaft 12 carries stirring elements 26 in the form of relatively short radial pins.
  • Counter-elements 40 also in the form of short radial pins, but attached to the inner wall of the grinding container 10, are only present in the inlet zone 22; the entire separation zone 24 around the separation device 16 is free of such counter-elements 40.
  • the agitator mill according to FIG. 9 corresponds to that shown in FIG. 7 in the design of the cone 58 and the inner end wall 60 of the grinding container 10; thus a conical friction gap 62 and a cylindrical friction gap 64 are also present here.
  • the cylindrical friction gap 64 is, however, much shorter since the cone 58 ends with a collar 66 which is narrow in the axial direction and the cage 25 begins immediately behind it, to the right of this in accordance with FIG. 9. whose outer diameter is considerably smaller than that of the collar 66.
  • the length of the cage 25, and thus the separation zone 24, is approximately three quarters of the length of the grinding chamber 20.
  • the cage 25 is equipped with pin-shaped stirring elements 28, between those fastened to the grinding container 10, pin-shaped counter-elements 40 also project radially inwards.
  • regrind 30 and auxiliary grinding body 32 are relatively strongly activated in the separation zone 24; the auxiliary grinding bodies 32 activated in this way are, however, reliably prevented by the collar 66 from entering the region of the grinding material inlet 14. As a result, it is particularly well protected against wear.
  • the cage 25, starting from its open free end, is divided into three areas which adjoin one another in the axial direction, namely an area 66 starting near the open end of the cage and provided with axially parallel, radially continuous slots 34 is a closed central region 68 which is completely free of such slots and a region 70 which is distant from the open end of the cage and in which radially continuous axially parallel slots 34 are again provided.
  • the closed central region 68 of the cage 25 is approximately half as long as the separation zone 24.
  • the cage 25 is completely closed not only in its central region 68 but also in its region adjacent to the open end of the cage; Radially continuous, axially parallel slots 34 or other openings through which grinding aid bodies 32 can exit the cage 25 are arranged only in the region 70 which is distant from the open end of the cage and extends around the end region 72 of the separating device 16.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP89122340A 1988-12-30 1989-12-04 Rührwerksmühle mit Trennvorrichtung in einem rotierenden Käfig Expired - Lifetime EP0376001B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19883844380 DE3844380C1 (en) 1988-12-30 1988-12-30 Agitator mill with separating device in a rotating cage
DE3844380 1988-12-30
DE3938171 1989-11-16
DE3938171A DE3938171C1 (nl) 1988-12-30 1989-11-16

Publications (2)

Publication Number Publication Date
EP0376001A1 EP0376001A1 (de) 1990-07-04
EP0376001B1 true EP0376001B1 (de) 1993-04-28

Family

ID=25875826

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89122340A Expired - Lifetime EP0376001B1 (de) 1988-12-30 1989-12-04 Rührwerksmühle mit Trennvorrichtung in einem rotierenden Käfig

Country Status (4)

Country Link
EP (1) EP0376001B1 (nl)
JP (1) JP2680738B2 (nl)
DE (2) DE3938171C1 (nl)
WO (1) WO1990007378A1 (nl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2744212C2 (ru) * 2017-01-30 2021-03-03 Неч-Файнмальтехник Гмбх Бисерная мельница

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5199656A (en) * 1990-10-15 1993-04-06 Union Process, Inc. Continuous wet grinding system
US5080293A (en) * 1990-10-15 1992-01-14 Union Process, Inc. Continuous wet grinding system
DE19510807C2 (de) * 1994-03-24 1997-04-17 Netzsch Erich Holding Rührwerksmühle
DE4432198A1 (de) * 1994-09-09 1996-03-14 Evv Vermoegensverwaltungs Gmbh Rührwerksmühle
DE19538476C2 (de) * 1995-10-16 1997-09-11 Netzsch Erich Holding Vorrichtung zur Erzeugung einer pastösen Suspension
DE19819967B4 (de) * 1998-05-05 2007-04-26 BüHLER GMBH Rührwerksmühle
JP2006205136A (ja) * 2005-01-31 2006-08-10 Tdk Corp 分散装置
JP4684000B2 (ja) * 2005-05-11 2011-05-18 アシザワ・ファインテック株式会社 媒体攪拌型粉砕装置
JP4741931B2 (ja) 2005-05-17 2011-08-10 アシザワ・ファインテック株式会社 循環型メディア撹拌ミル
JP4583387B2 (ja) * 2007-01-30 2010-11-17 オリバー イー バトレ ソシエダッド アノニマ 縦型攪拌粉砕機
DE102010049827A1 (de) * 2010-10-27 2012-05-03 Netzsch-Feinmahltechnik Gmbh Rührwerkskugelmühle
AU2014270495B2 (en) 2013-05-21 2019-02-21 Flsmidth A/S Methods and apparatus for the continuous monitoring of wear in grinding circuits
DE102013021757A1 (de) * 2013-12-20 2015-06-25 Netzsch Trockenmahltechnik Gmbh Maschine mit fliegend gelagertem Rotor
US10493464B2 (en) 2014-12-18 2019-12-03 Aaron Engineered Process Equipment, Inc. Rotary mill
US10086379B2 (en) 2015-02-27 2018-10-02 Aaron Engineered Process Equipment, Inc. Rotary mill
JP6785791B2 (ja) * 2015-04-17 2020-11-18 ビューラー・アクチエンゲゼルシャフトＢｕｅｈｌｅｒ ＡＧ 混合、特に分散のための装置および方法
JP6423988B2 (ja) * 2016-01-28 2018-11-14 株式会社広島メタル＆マシナリー 攪拌ミル及びスラリー中粒子の分散方法
JP7378253B2 (ja) * 2019-09-18 2023-11-13 日本コークス工業株式会社 粉砕処理方法
DE102021123408A1 (de) * 2021-09-09 2023-03-09 Netzsch-Feinmahltechnik Gmbh Rührwerksmühle

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US3172609A (en) * 1960-11-03 1965-03-09 Kaiser Aluminium Chem Corp Apparatus for disintegrating aggregates of solid material
DE1184188B (de) * 1961-06-21 1964-12-23 Draiswerke Gmbh Ruehrwerksmuehle zur Herstellung von Feststoffdispersionen
DE3345680A1 (de) * 1983-12-16 1985-06-20 Gebrüder Netzsch, Maschinenfabrik GmbH & Co, 8672 Selb 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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2744212C2 (ru) * 2017-01-30 2021-03-03 Неч-Файнмальтехник Гмбх Бисерная мельница

Also Published As

Publication number Publication date
DE3938171C1 (nl) 1991-01-03
DE58904209D1 (de) 1993-06-03
JP2680738B2 (ja) 1997-11-19
WO1990007378A1 (de) 1990-07-12
EP0376001A1 (de) 1990-07-04
JPH03503025A (ja) 1991-07-11

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