EP4049758A1 - Rotor résistant à l'usure - Google Patents

Rotor résistant à l'usure Download PDF

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Publication number
EP4049758A1
EP4049758A1 EP21158944.5A EP21158944A EP4049758A1 EP 4049758 A1 EP4049758 A1 EP 4049758A1 EP 21158944 A EP21158944 A EP 21158944A EP 4049758 A1 EP4049758 A1 EP 4049758A1
Authority
EP
European Patent Office
Prior art keywords
rotor
ceramic ring
wall
agitator mill
stator
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.)
Pending
Application number
EP21158944.5A
Other languages
German (de)
English (en)
Inventor
Cornel Fraefel
Eduard Nater
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Buehler AG
Original Assignee
Buehler AG
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 Buehler AG filed Critical Buehler AG
Priority to EP21158944.5A priority Critical patent/EP4049758A1/fr
Priority to TW111102367A priority patent/TWI832144B/zh
Priority to US18/547,098 priority patent/US20240042454A1/en
Priority to JP2023547620A priority patent/JP2024507484A/ja
Priority to KR1020237032002A priority patent/KR20230148343A/ko
Priority to CN202280013712.XA priority patent/CN116801985A/zh
Priority to PCT/EP2022/025055 priority patent/WO2022179750A1/fr
Publication of EP4049758A1 publication Critical patent/EP4049758A1/fr
Pending 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
    • 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
    • B02C17/18—Details
    • B02C17/183—Feeding or discharging devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C2210/00—Codes relating to different types of disintegrating devices
    • B02C2210/02—Features for generally used wear parts on beaters, knives, rollers, anvils, linings and the like

Definitions

  • the invention relates to a rotor for an agitator mill, and in particular to a wear-resistant, dimensionally stable plastic rotor.
  • Agitator mills have a wide range of applications when grinding and dispersing solids in liquids. They are used, for example, in the production of adhesives, printing inks, cosmetics, pharmaceuticals or for the production of raw materials (especially silicon) for battery pastes.
  • a grinding chamber is usually formed in a vertical agitator mill by a rotor rotating about a vertically oriented central longitudinal axis and a stator, in which dispersions are prepared, if appropriate using grinding aids, for example ceramic balls.
  • grinding tools for example in the form of round pins, can be attached to the rotor and/or the stator.
  • the material to be ground is fed into the grinding chamber via a product inlet, where it is ground and discharged via a product outlet.
  • Such an agitator mill is, for example, from EP 1 992 412 A1 known.
  • One object of the present invention is to provide an inexpensive rotor for an agitator mill, which is dimensionally stable and, in particular, resistant to common solvents and can be used in particular for the production of battery pastes.
  • the wet grinding of abrasive solids should be made possible without disruptive wear in the end product.
  • the basic idea of the invention is to use a rotor body for the rotor of an agitator mill, which has a wear element made of ceramic in the area of high energy densities, particularly in the lower area of the process zone, ie at the lower end of the rotor.
  • a wear element made of ceramic in the area of high energy densities, particularly in the lower area of the process zone, ie at the lower end of the rotor.
  • a rotor which has a generally cylindrical rotor body, the outer wall of which defines an inner surface of a grinding chamber through which a material to be ground flows during operation of the agitator mill.
  • a ceramic ring is arranged in an area of the rotor with high energy input. This area is the side of the rotor opposite where the product enters the bead mill. On a vertical agitator mill, this is the lower section of the rotor body.
  • a surface of the ceramic ring forms in particular a portion of the outer wall of the rotor forming the inner surface of the grinding chamber.
  • the section preferably extends to grinding tools that are arranged on the outer wall of the rotor. In this way, the ceramic ring can be secured against twisting and/or falling off by the grinding tools.
  • the ceramic ring is preferably connected to the rotor body, in particular screwed, glued or positively connected. If, according to a preferred embodiment, the rotor body is made of plastic, the ceramic ring can also be cast into the rotor body.
  • the ceramic ring can have an essentially L-shaped cross section, with the long side of the L-shaped ceramic ring, ie its limb, being arranged on the outer surface of the rotor.
  • the ceramic ring can have a substantially U-shaped cross section, the legs of which are arranged on the outer surface and the inner surface of the rotor.
  • the ratio L/D of the length L of the portion of the outer wall of the rotor formed by the ceramic ring to the outer diameter D of the rotor is between 0.05 and 0.5.
  • the ratio S1/S2 of the thickness S1 of the portion of the ceramic ring that forms the outer wall of the rotor to that of the overall rotor wall thickness S2 is preferably between 0.1 and 0.9.
  • the plastic rotor can have at least one of the following materials: PA, PET, PEEK, PVDF and POM.
  • the ceramic ring in turn can have at least one of the following materials: ZrO 2 , SSiC, SiSiC and Si 3 N 4 .
  • the present invention also provides an agitator mill with a rotor according to the invention.
  • the agitator mill according to the invention also has a stator with an inner wall of the stator, with the rotor being arranged inside the stator. Furthermore, a product inlet and a product outlet is provided and the grinding chamber is between the inner wall of the stator and the Outer wall of the rotor formed. The material to be ground can be fed into the grinding chamber via the product inlet and out of the grinding chamber via the product outlet.
  • the agitator mill can have an inner stator arranged within a section of the rotor, with a product outlet being formed between the rotor and an outer wall of the inner stator.
  • 0.8 ⁇ d22/d1 ⁇ 0.98 preferably applies to a ratio of an outer diameter d22 of the inner stator to an inner diameter d1 of the rotor.
  • the invention also relates to the use of the rotor according to the invention in an agitator mill for the production of dispersions, in particular a battery paste, and a method for producing the rotor.
  • the method includes the step of connecting, in particular gluing, screwing or positively connecting, a ceramic ring to the rotor body.
  • the agitator mill shown has a grinding container or stator 2 with an internal grinding chamber 8 in the usual way.
  • the grinding chamber 8 is at least partially filled with grinding media 43 .
  • the agitator mill also has an internal stator 22 and a rotor 35 which can be rotated about a central longitudinal axis 19 .
  • First tools 38 are attached to the rotor 35 and protrude into the grinding chamber 8 .
  • Second tools 74 are attached to the inner wall 9 of the container or stator, which protrude into the grinding chamber 8 .
  • the processed grist is passed through a gap between rotor 35 and inner stator 22 to a protective screen 30, which keeps grinding media 43 out, and flows out via a drain line 31.
  • the figure 2 shows a cross-sectional view of a rotor for a as in figure 1 vertical agitator mill shown.
  • the rotor according to the illustrated embodiment of the invention has a generally cylindrical rotor body 351 with an outer wall 32 .
  • the rotor body 351 with the outer diameter D can be made of plastic or steel, with plastic being preferred.
  • the rotor forms, together with the in figure 1 Stator shown, when the agitator mill is in operation, a grinding chamber through which the material to be ground flows.
  • the greatest wear on the rotor of a vertical agitator mill is usually caused in the lower area of the rotor, namely the area in which high energy densities occur due to gravitation and the deflection of the material to be ground with the grinding media, in combination with the high rotor speed.
  • the area where the greatest wear is caused is the area opposite the product inlet during operation. It is precisely in this area that an annular wear ring is provided according to the present invention, which is made of a hard and therefore very wear-resistant ceramic material.
  • the materials ZrO 2 , SSiC, SiSiC and Si 3 N 4 should be mentioned here, for example.
  • the rotor 35 can be made for the most part from an inexpensive basic rotor body, but with the wear-prone sections being replaced by the wear-resistant ceramic material.
  • the ceramic ring 352 may have a generally L-shaped profile, with the short side of the L forming the underside and the long side, i.e. the leg of the L, forming the lower portion of the outer side 32 where the greatest wear is caused.
  • the ceramic ring 352 thus forms the lower section of the length L of the outside 32 and the underside of the rotor with the total wall thickness S2.
  • the ceramic ring 352 is connected to the rotor body, for example screwed, glued or, in the case of a plastic rotor body, cast into the plastic.
  • the ceramic ring 352 preferably extends to the bottom row of the grinding tools 38, as in the section marked X in FIG figure 2 shown. In this way, the ceramic ring 352 can additionally be secured by the tools 38, in particular against twisting or falling off.
  • figure 3 12 shows a cross-sectional view of a rotor according to another embodiment of the present invention.
  • a ceramic wear member is attached to the lower portion of the rotor body 351 .
  • this is again realized in the form of a ceramic ring 352, which - unlike in figure 2 - Has an essentially U-shaped profile, so that - in addition to the underside and a section of the outside 32 - a section of the surface of the inside of the rotor is reinforced by the wear element through the second leg of the U, i.e. a section of the product outlet.
  • the ceramic ring 352 can again extend at least to the bottom row of the grinding tools 38, as in the section of FIG figure 3 shown.
  • the invention also provides an agitator mill using the rotor of the invention.
  • an agitator mill using the rotor of the invention.
  • the rotor 35 as exemplified in the figure 1 is shown, by a rotor according to the invention, such as the example figures 2 or 3 shows, replaced.
  • Typical expansions of such an agitator mill result in values between 0.6 and 0.95 for a ratio of an outer diameter of the rotor 35 to an inner diameter of the stator 2 .
  • the ratio of the outside diameter of the inner stator 22 to the inside diameter of the rotor 35 is, for example, 0.8 to 0.98.
  • the rotor according to the invention can be produced in particular by connecting a ceramic ring 352 to the rotor body 351 . This can be done in particular by gluing, screwing or positive connection. If the rotor body 352 is made of plastic, the ceramic ring 352 can also be cast in the plastic body 351 .
EP21158944.5A 2021-02-24 2021-02-24 Rotor résistant à l'usure Pending EP4049758A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP21158944.5A EP4049758A1 (fr) 2021-02-24 2021-02-24 Rotor résistant à l'usure
TW111102367A TWI832144B (zh) 2021-02-24 2022-01-20 攪拌磨機及用於其中的轉子
US18/547,098 US20240042454A1 (en) 2021-02-24 2022-02-17 Wear-resistant rotor
JP2023547620A JP2024507484A (ja) 2021-02-24 2022-02-17 耐磨耗性回転子
KR1020237032002A KR20230148343A (ko) 2021-02-24 2022-02-17 내마모성 회전자
CN202280013712.XA CN116801985A (zh) 2021-02-24 2022-02-17 耐磨转子
PCT/EP2022/025055 WO2022179750A1 (fr) 2021-02-24 2022-02-17 Rotor résistant à l'usure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21158944.5A EP4049758A1 (fr) 2021-02-24 2021-02-24 Rotor résistant à l'usure

Publications (1)

Publication Number Publication Date
EP4049758A1 true EP4049758A1 (fr) 2022-08-31

Family

ID=74732744

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21158944.5A Pending EP4049758A1 (fr) 2021-02-24 2021-02-24 Rotor résistant à l'usure

Country Status (7)

Country Link
US (1) US20240042454A1 (fr)
EP (1) EP4049758A1 (fr)
JP (1) JP2024507484A (fr)
KR (1) KR20230148343A (fr)
CN (1) CN116801985A (fr)
TW (1) TWI832144B (fr)
WO (1) WO2022179750A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1992412A1 (fr) 2005-10-11 2008-11-19 Bühler Ag Moulin mélangeur agitateur
DE102014101727B3 (de) * 2013-11-08 2015-03-19 Netzsch-Feinmahltechnik Gmbh Verschleißschutzanordnung für eine Rührwerksmühle
CH715322A2 (de) * 2018-09-13 2020-03-13 Netzsch Feinmahltechnik Rührwelle für eine Rührwerkskugelmühle, Rührwerkskugelmühle und Verfahren zum Herstellen einer Rührwelle für eine Rührwerkskugelmühle.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE102018122408B4 (de) * 2018-09-13 2023-11-09 Netzsch Feinmahltechnik Gmbh Rührwerkskugelmühle, Verschleißschutzhülse für eine Rührwerkskugelmühle und Verfahren zum Herstellen einer Verschleißschutzhülse für eine Rührwerkskugelmühle
CN110328021A (zh) * 2019-07-17 2019-10-15 北矿机电科技有限责任公司 超细磨用搅拌盘及立式搅拌装置及立式超细搅拌磨机

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1992412A1 (fr) 2005-10-11 2008-11-19 Bühler Ag Moulin mélangeur agitateur
DE102014101727B3 (de) * 2013-11-08 2015-03-19 Netzsch-Feinmahltechnik Gmbh Verschleißschutzanordnung für eine Rührwerksmühle
CH715322A2 (de) * 2018-09-13 2020-03-13 Netzsch Feinmahltechnik Rührwelle für eine Rührwerkskugelmühle, Rührwerkskugelmühle und Verfahren zum Herstellen einer Rührwelle für eine Rührwerkskugelmühle.

Also Published As

Publication number Publication date
TW202233305A (zh) 2022-09-01
CN116801985A (zh) 2023-09-22
TWI832144B (zh) 2024-02-11
JP2024507484A (ja) 2024-02-20
KR20230148343A (ko) 2023-10-24
US20240042454A1 (en) 2024-02-08
WO2022179750A1 (fr) 2022-09-01

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