EP3573762B1 - Rührwerksmühle - Google Patents

Rührwerksmühle Download PDF

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Publication number
EP3573762B1
EP3573762B1 EP18710995.4A EP18710995A EP3573762B1 EP 3573762 B1 EP3573762 B1 EP 3573762B1 EP 18710995 A EP18710995 A EP 18710995A EP 3573762 B1 EP3573762 B1 EP 3573762B1
Authority
EP
European Patent Office
Prior art keywords
stirring shaft
shaft section
stirring
grinding
length
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.)
Active
Application number
EP18710995.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3573762A1 (de
Inventor
Horst Pausch
Gerhard Kolb
Holger Moeschl
Udo Enderle
Witali Sudermann
Lars-Peter Weiland
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.)
Netzsch Feinmahltechnik GmbH
Original Assignee
Netzsch Feinmahltechnik 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 Netzsch Feinmahltechnik GmbH filed Critical Netzsch Feinmahltechnik GmbH
Publication of EP3573762A1 publication Critical patent/EP3573762A1/de
Application granted granted Critical
Publication of EP3573762B1 publication Critical patent/EP3573762B1/de
Active 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
    • B02C17/163—Stirring means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/21—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by their rotating shafts
    • B01F27/212—Construction of the shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/836—Mixing plants; Combinations of mixers combining mixing with other treatments
    • B01F33/8361—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating
    • B01F33/83613—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating by grinding or milling
    • 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
    • B02C2017/165—Mills in which a fixed container houses stirring means tumbling the charge with stirring means comprising more than one agitator

Definitions

  • the longitudinal slots forming part of a separating device extend in the second agitator shaft section slightly into the first agitator shaft section of smaller diameter. They end approximately in a radial plane with the sieve forming part of the separating device.
  • the ground material flows through the grinding container from the ground material inlet to the opposite end of the grinding chamber and then enters the cavity within the second agitator shaft section together with the grinding auxiliary bodies carried along by the flow of the ground material. Since the cavity is essentially cylindrical, the webs delimited by the slots are larger in the end area of the agitator shaft than in the area of the cover of the sieve. In the entry area of the cavity there is therefore an increased ejection of grinding auxiliary bodies and coarse grinding material particles. This is intended to increase the radial flow of auxiliary grinding bodies from the separating device back into the grinding chamber.
  • an agitator mill similar to the known agitator mill described above is known, in which the agitator shaft has a constant profile over its full length.
  • recesses running in the longitudinal direction of the agitator shaft are formed, which open into the slots that surround the cavity with the sieve in the second agitator shaft section.
  • the purpose of the recesses, which are symmetrical to a respective radius, is to convey the grinding auxiliary bodies directly into the slots of the separating device, so that there is increased return to the grinding chamber. A sufficiently uniform and compression-free distribution of the grinding auxiliary bodies in the grinding chamber is not yet achieved by these known measures.
  • an agitator mill with a horizontally arranged grinding container which has a cylindrical inner wall.
  • a stirring shaft that can be driven in a drive direction of rotation about a common central longitudinal axis is arranged in the grinding container.
  • the agitator mill has a grinding chamber delimited by the inner wall and the agitator shaft, into the first end of which a ground material inlet opens.
  • the agitator shaft is either continuously cylindrical with a constant diameter or has areas with different diameters.
  • the agitator shaft has a cavity adjacent to the outlet in which a separating device is arranged. In the area of this cavity, the agitator shaft is provided with longitudinal slots which open from the grinding chamber into the cavity.
  • this area is viewed as a separation zone, the length of which in the direction of the axis of the agitator shaft accounts for 40 to 80% of the total length of the grinding chamber.
  • the purpose of these measures is to significantly increase the shredding performance per unit of time and to achieve particularly uniform shredding of the ground material. A sufficiently uniform and compression-free distribution of the grinding auxiliary bodies in the grinding chamber is not achieved by these known measures.
  • an agitator mill with a pot-shaped agitator is known, which is arranged in a likewise pot-shaped grinding container. Both the pot-shaped inner agitator and the outer agitator can be rotated. They are arranged in a vessel.
  • the grinding material is fed from the inside through a separating device that allows the grinding material to pass through but retains the auxiliary grinding particles.
  • the outer, rotatable grinding container has separating devices that allow the grinding material to pass through.
  • the ground material is fed from the inside. It flows through the grinding chambers to the outside and is discharged from an external grinding chamber.
  • an agitator mill with a coolable agitator shaft which has a grinding container in which an agitator is arranged.
  • the agitator has coolable elements with gaps between them.
  • the grinding space between the agitator and the grinding container wall is filled with grinding auxiliary bodies and the material to be ground flows through from an inlet to an outlet.
  • the ground material is guided to the open end of the agitator and enters there into a cavity of the agitator in which a sieve is arranged.
  • Auxiliary grinding bodies are thrown radially outwards through the spaces between the cooled elements of the agitator.
  • the invention is therefore based on the object of developing an agitator mill according to the preamble of claim 1 in such a way that a largely uniform distribution of the grinding auxiliary bodies in the grinding chamber is achieved while avoiding compression.
  • the first agitator shaft section has at least one short-circuit channel which penetrates the bottom of the cavity and connects the first grinding space area to the cavity, which is at least partially formed in the transition section, and that the at least a short-circuit channel is positioned radially outwards against the drive direction of rotation.
  • the measures according to the invention ensure that a material to be ground that is largely free of auxiliary grinding bodies is conveyed directly in the short circuit into the separating device, i.e. directly in front of the sieve. There will be fine regrind particles are discharged directly through the regrind outlet. A portion of the already sufficiently fine ground material is therefore only subjected to a grinding process in the first grinding chamber area.
  • the design of the at least one short-circuit channel increases the centrifugal effect, which has a correspondingly strong effect on grinding auxiliary bodies and coarse grinding material particles.
  • the at least one short-circuit channel formed in the first agitator shaft section extends in the direction of the central longitudinal axis over 10 to 100%, or at least 70%, or at least 80%, or at least 90% of the length L24 of the first agitator shaft section extends, then it can be achieved that the ground material supplied to the separating device in the short circuit is already freed of grinding auxiliary bodies and coarse ground material particles to the desired extent. This effect is achieved in a particularly pronounced manner if the at least one short-circuit channel has an inner diameter D39 that is smaller than the inner diameter D27 of the cavity.
  • a horizontal agitator mill has a machine frame 1 which is supported on the floor 2.
  • a drive motor 3 is arranged, which is coupled to a drive shaft 5 by means of a belt drive 4.
  • a horizontal grinding container 6 is attached to it.
  • This has a first grinding container lid 7, which is attached to the machine frame 1 and in which the drive shaft 5 is rotatably mounted by means of roller bearings 8.
  • the grinding container 6 also has a cylindrical inner wall 9, which is surrounded by a temperature control jacket 10, into which temperature control medium, usually coolant, is introduced through an inlet 11 and discharged through an outlet 12.
  • temperature control medium usually coolant
  • the grinding container 6 is closed by a second grinding container lid 13.
  • the connection between the inner wall 9 and the temperature control jacket 10 with the first cover 7 and the second cover 13 takes place by means of flanges 14, 15 and associated screw connections 16.
  • a grinding chamber 17 is delimited by the cylindrical inner wall 9 and the first cover 7 and the second cover 13, into which a grinding material inlet 18 formed in the first cover 7 opens and from which one in the second The ground material outlet 19 arranged on the cover 13 opens out.
  • a grinding auxiliary body filler connection 20 and an auxiliary grinding body outlet connection 21 also open into the grinding chamber 17, both of which are also formed on the second cover 13.
  • An agitator shaft 22 is arranged in the grinding chamber 17, which is connected in a rotationally fixed manner to the drive shaft 5 and can be driven by the latter about a common horizontal central longitudinal axis 23 of the drive shaft 5, grinding chamber 17 and agitator shaft 22.
  • the agitator shaft 22 is not mounted in the grinding chamber 17; It is therefore freely mounted via its coupling to the drive shaft 5.
  • the agitator shaft 22 has two sections, namely a first agitator shaft section 24 with an outer diameter D24 following the ground material inlet 18 and then a second agitator shaft section 25 with an outer diameter D25. The following applies: D25 > D24.
  • a transition section 26 between the first stirring shaft section 24 of smaller diameter D24 and the second stirring shaft section 25 of larger diameter D25 is assigned to the first stirring shaft section 24.
  • the first stirring shaft section 24 is essentially designed as a solid material section, while the second stirring shaft section 25 has a cavity 27 which is open towards the second cover 13.
  • the length L27 of the cavity 27 in the direction of the first stirring shaft section 24 is less than the length L25 of the second stirring shaft section 25. The following therefore applies: L27 ⁇ L25.
  • the second stirring shaft section 25 faces outwards open longitudinal slots 28 running parallel to the axis 23, which - like Figure 4 can be removed - based on the drive rotation direction 29 of the agitator shaft 22 are set radially outwards against the direction of rotation 29.
  • the second stirring shaft section 25 is closed at its end adjacent to the second cover 13 by means of an end ring 30, which also closes the longitudinal slots 28 in the direction parallel to the axis 23.
  • a separating device 31 is formed concentrically to the axis 23, which consists of the longitudinal slots 28 and a cylindrical sieve 32, which is closed at the end to the first agitator shaft section 24 by means of a cover 33 and that on its other side End is held in a base 34, which is attached to the second lid 13 and has the regrind outlet 19.
  • the sieve 32 extends into the vicinity of the end of the cavity 27 adjacent to the first agitator shaft section 24.
  • the stirring shaft 22 is equipped with stirring elements 35, 36 in the form of stirring pins, each of which is mounted at a circumferential distance of 90 degrees from one another on the circumference of the stirring shaft 22 and radially to the axis 23.
  • stirring elements 35, 36 arranged in a plane perpendicular to the axis 23.
  • the stirring elements 35 in the first grinding chamber region 37 surrounding the first stirring shaft section 24 are longer than the stirring elements 36 in the second grinding chamber region 38 surrounding the second stirring shaft section 25. This results from the fact that the inner diameter D24 of the first grinding chamber area 37 is smaller than the inner diameter D25 of the second grinding chamber area 38 and that all stirring elements 35, 36 end at the same distance from the inner wall 9 of the grinding container 6.
  • each two longitudinal slots 28 are formed between two stirring elements 35 offset from one another by 90 degrees.
  • the circumferential distance between the stirring elements 35 can be less than 90°. In such a case, no longer two but only one longitudinal slot 28 may be formed between two stirring elements 35 adjacent in a circumferential plane.
  • short-circuit channels 39 are formed in the transition section 26 from the first stirring shaft section 24 of smaller diameter D24 to the second stirring shaft section 25 of larger diameter D25, which surround the first grinding chamber area 37 with the cavity 27 surrounding the first stirring shaft section 24 connect.
  • These short-circuit channels 39 open - like Figure 2 and Figure 4 can be removed - into the longitudinal slots 28 and are - based on the flow direction 40 from the regrind inlet 18 to the regrind outlet 19 - in front of the cavity 27, i.e. in the solid material area of the agitator shaft 22. They therefore open through the bottom 41 of the cavity 27 into the latter.
  • the short-circuit channels 39, 39 ' are positioned against the direction of rotation 29 in the same way as the longitudinal slots 28 - viewed from the central longitudinal axis 23 outwards. They therefore open axially into the longitudinal slots 28. Furthermore, the short-circuit channels 39, 39' - at least in the transition region 26 - have an inner diameter D39, D39' which is smaller than the inner diameter D27 of the cavity 27, so that the short-circuit channels 39, 39' pass directly through the base 41 of the cavity 27 open into this.
  • the inner diameter D39, D39 ' is slightly larger than the outer diameter D33 of the cover 33 of the sieve 32.
  • the exemplary embodiment according to the Figures 8 to 10 differs from the one according to the Figures 5 to 7 only in that the inner diameter D39" of the short-circuit channels 39" is smaller than the outer diameter D33 of the cover 33 of the sieve 32. This can of course also be the case in the exemplary embodiment according to Figures 1 to 4 be the case.
  • the operation method is as follows:
  • the grinding chamber 17, i.e. the free space between the inner wall 9 and the agitator shaft 22, is filled to approximately 90% with only indicated grinding auxiliary bodies 42.
  • the diameter D42 of the grinding auxiliary bodies 42 is in the range from 0.03 mm to 0.8 mm and preferably in the range from 0.03 mm to 0.4 mm.
  • the ground material to be ground or dispersed is pumped through the ground material inlet 18 into the grinding container 6 and flows through the grinding chamber 17 in the flow direction 40 under intensive stress caused by the stirring elements 35, 36 and the grinding auxiliary bodies 42, the average flow rate in the first grinding chamber area 37 being lower than in the second grinding chamber area 38, because of the different large free cross sections of these grinding chamber areas 37, 38.
  • a further part of the material to be ground is conveyed through the second grinding chamber region 38 under further intensive action by the auxiliary grinding bodies 42 and flows around the end ring 30 into the cavity 27 between the sieve 32 and the second agitator shaft section 25, where the auxiliary grinding bodies 42 and Coarse ground material particles are thrown off more pronouncedly than fine ground material particles according to the outwardly directed flow arrows 45 through the longitudinal slots 28 into the second grinding chamber area 38.
  • the risk of compaction and compression of auxiliary grinding bodies 42 in the first grinding chamber area 37 is lower than in the second grinding chamber area 38 If part of the ground material is already fed directly from the first grinding chamber area 37 to the separation device 31 in the short-circuit channels 39, the flow rate of the ground material becomes also reduced in the second grinding chamber area 38, so that the risk of pressing of the grinding auxiliary bodies 42 is reduced there too.
  • the short-circuit channels 39', 39" extend over a greater length L39', L39" in the direction of the regrind inlet 18, then the stream of regrind, which is fed directly to the separating device 31 in the short circuit, is in Comparison to the exemplary embodiment according to Figures 1 to 4 enlarged because, due to the described design of the short-circuit channels 39 ', 39", grinding auxiliary bodies 42 and coarse regrind particles are thrown out radially into the first grinding chamber area 37 from the short-circuit channels 39" in accordance with the directional arrows 46 shown become. This applies in particular to the exemplary embodiment according to Fig. 8 to 10 .

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Crushing And Grinding (AREA)
EP18710995.4A 2017-01-30 2018-01-30 Rührwerksmühle Active EP3573762B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017201418.0A DE102017201418B3 (de) 2017-01-30 2017-01-30 Rührwerksmühle
PCT/DE2018/000015 WO2018137731A1 (de) 2017-01-30 2018-01-30 Rührwerksmühle

Publications (2)

Publication Number Publication Date
EP3573762A1 EP3573762A1 (de) 2019-12-04
EP3573762B1 true EP3573762B1 (de) 2023-09-20

Family

ID=61376864

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18710995.4A Active EP3573762B1 (de) 2017-01-30 2018-01-30 Rührwerksmühle

Country Status (11)

Country Link
US (1) US11318475B2 (pl)
EP (1) EP3573762B1 (pl)
KR (1) KR102262780B1 (pl)
CN (2) CN206951328U (pl)
BR (1) BR112019013933A2 (pl)
DE (1) DE102017201418B3 (pl)
ES (1) ES2965736T3 (pl)
HU (1) HUE064447T2 (pl)
PL (1) PL3573762T3 (pl)
RU (1) RU2744212C2 (pl)
WO (1) WO2018137731A1 (pl)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020103848A1 (de) * 2020-02-14 2021-08-19 Netzsch-Feinmahltechnik Gmbh Temperiertes Bauteil und Verfahren zur Herstellung eines temperierten Bauteils
KR20220076666A (ko) * 2020-12-01 2022-06-08 주식회사 엘지에너지솔루션 이차전지 재료 분산용 수평형 비드밀 및 도전재 분산방법
CN115041495B (zh) * 2022-06-13 2024-01-23 中交二公局第七工程有限公司 可快速安装、温度监控及泄漏监测的餐厨废弃物处理设备
DE102022130384A1 (de) * 2022-11-17 2024-05-23 Netzsch-Feinmahltechnik Gmbh Rührwerksmühle mit Korb mit Verdickung

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3938171C1 (pl) * 1988-12-30 1991-01-03 Erich Netzsch Gmbh & Co Holding Kg, 8672 Selb, De
KR950007586A (ko) * 1993-08-23 1995-03-21 배순훈 리모콘전압 검출표시장치
DE4419919C1 (de) * 1994-06-07 1995-02-23 Netzsch Erich Holding Rührwerksmühle
DE10064828B4 (de) 2000-12-22 2007-07-12 Erich Netzsch Gmbh & Co Holding Kg Rührwerksmühle
RU22892U1 (ru) * 2001-10-30 2002-05-10 Роганин Сергей Павлович Горизонтальная бисерная мельница
DE10241924B3 (de) * 2002-09-10 2004-05-27 Netzsch-Feinmahltechnik Gmbh Rührwerksmühle mit kühlbarer Rührwelle
ES2304157T3 (es) * 2003-04-15 2008-09-16 Willy A. Bachofen Ag Molino de bolas con agitador.
ATE491517T1 (de) * 2007-08-17 2011-01-15 Buehler Ag Rührwerksmühle
DE102010049827A1 (de) * 2010-10-27 2012-05-03 Netzsch-Feinmahltechnik Gmbh Rührwerkskugelmühle
DE102010053484A1 (de) * 2010-12-04 2012-06-06 Netzsch-Feinmahltechnik Gmbh Dynamisches Element für die Trenneinrichtung einer Rührwerkskugelmühle
JP5921172B2 (ja) * 2011-12-09 2016-05-24 アシザワ・ファインテック株式会社 横型乾式粉砕機
DE102013111762A1 (de) * 2013-07-08 2015-01-08 Netzsch-Feinmahltechnik Gmbh Rührwerkskugelmühle mit Axialkanälen
CN204074173U (zh) * 2013-12-31 2015-01-07 占天义 搅拌式研磨装置
CN204816705U (zh) * 2015-06-29 2015-12-02 广州派勒机械设备有限公司 具有双重分离系统的超级砂磨机

Also Published As

Publication number Publication date
CN110198787B (zh) 2021-02-26
RU2744212C2 (ru) 2021-03-03
US20200324297A1 (en) 2020-10-15
BR112019013933A2 (pt) 2020-02-11
KR20190109500A (ko) 2019-09-25
ES2965736T3 (es) 2024-04-16
KR102262780B1 (ko) 2021-06-09
DE102017201418B3 (de) 2018-06-28
EP3573762A1 (de) 2019-12-04
CN110198787A (zh) 2019-09-03
RU2019126436A3 (pl) 2021-03-01
PL3573762T3 (pl) 2024-03-04
US11318475B2 (en) 2022-05-03
WO2018137731A1 (de) 2018-08-02
RU2019126436A (ru) 2021-03-01
CN206951328U (zh) 2018-02-02
HUE064447T2 (hu) 2024-03-28

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