EP4147782A1 - Broyeur agitateur - Google Patents

Broyeur agitateur Download PDF

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Publication number
EP4147782A1
EP4147782A1 EP22191606.7A EP22191606A EP4147782A1 EP 4147782 A1 EP4147782 A1 EP 4147782A1 EP 22191606 A EP22191606 A EP 22191606A EP 4147782 A1 EP4147782 A1 EP 4147782A1
Authority
EP
European Patent Office
Prior art keywords
grinding
agitator
grinding chamber
rotor
discs
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
EP22191606.7A
Other languages
German (de)
English (en)
Inventor
Udo Enderle
Thomas GOLLER
Holger Möschl
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 EP4147782A1 publication Critical patent/EP4147782A1/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
    • 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

Definitions

  • the invention relates to an agitator mill with a grinding chamber containing grinding bodies, an agitator shaft and a plurality of agitator bodies according to the preamble of claim 1.
  • an agitator mill also known as an agitator ball mill
  • 1 an agitator mill 1 with a horizontal agitator shaft 3 is shown schematically.
  • the material to be ground is pumped via the inlet 5 of the agitator mill 1 into or through the grinding chamber 7 enclosed by the grinding container 2 .
  • the material to be ground is usually a suspension of water and solids.
  • a rotational movement of the agitator shaft 3 causes the agitator bodies 8, which are connected in a rotationally fixed manner to the agitator shaft 3 and are frequently also referred to as grinding disks, to rotate.
  • Sleeve-like agitator shaft bushings 12 are often attached to the agitator shaft 3, particularly between the agitator bodies 8, as spacers for the agitator body 8 and protection for the agitator shaft 3, which are not explicitly shown in the figures.
  • the agitator shaft 3 can be driven by an electric motor 9 via a belt drive 10, for example.
  • the drive of the agitator mill 1 is usually located in a housing 11 adjacent to the grinding container 2.
  • the movement of the grinding bodies causes collisions between the solids in the grinding stock suspension pumped through the grinding chamber 7 and the grinding bodies. These collisions result in fine particles splintering off the solids in the ground stock suspension, so that the solids arriving at the outlet 6 of the agitator mill 1 are ultimately significantly smaller than the solids fed in at the inlet 5 .
  • a separating system 4 for example in the form of a sieve or a filter, is fitted in front of the outlet 6.
  • the patent DE34341553A1 also proposes lengthening the grinding discs in such a way that their radial distance from the inner wall of the grinding container is minimized so that it is smaller than the diameter of the grinding media used. This is to prevent, above all, that individual grinding media between the central areas, which are each formed between two grinding discs, can be moved.
  • Such a known agitator mill is proposed with a grinding chamber containing a grinding body and an agitator shaft rotating therein about a horizontal axis.
  • the agitator shaft carries several grinding disks which are connected to it in a rotationally fixed manner and are spaced apart from one another in the direction of the horizontal axis and which can be constructed in one piece or in several parts.
  • These grinding discs induce a movement of the grinding media.
  • the grinding disks usually have grooves and/or continuous slots or openings.
  • adjacent grinding discs are arranged on the agitator shaft in such a way that the ratio of the grinding chamber length b to the radial grinding chamber height a is greater than or equal to 2:3, measured in the axial direction along the above-mentioned horizontal axis.
  • the radial distance c between the outer lateral surface of the grinding disks and the inner wall of the grinding container delimiting the grinding chamber is more than 20% of the radial grinding chamber height a. If the grinding discs are not completely cylindrical along their peripheral surface, for example because they have grooves, slots or flattened areas, then the said ratio is maintained along the majority of the circumference and ideally along the essentially entire or entire circumference.
  • a further, synergistic improvement in the same sense is achieved when the grinding disks have grooves, slits and/or openings. This creates a further improved entrainment effect for the grinding media in the circumferential direction.
  • the grinding media also receive an additional impulse in the direction parallel to the axis of rotation of the agitator shaft when passing through the grooves, slots or openings. As a result, they then move again in the direction of the center of the grinding chamber delimited by the two grinding discs, which, viewed overall, increases the circulation within the grinding chamber, especially transversely or diagonally to the direction of rotation.
  • the grinding chamber height a is the dimension between the inner wall of the grinding container delimiting the grinding chamber 7 and the largest enveloping diameter of the agitator shaft or the agitator shaft bushing that may be attached to the agitator shaft.
  • the grinding chamber length b is the measure of the distance between two adjacent grinding disks, the distance between the edges of the side pointing towards the grinding chamber and thus spanning the grinding chamber being used in each case.
  • the grinding container 2 shows a first variant of the agitator mill 1 with agitator shaft bushings 12, which are shown here only by “dummies” which are not meaningful and are therefore indicated with dots.
  • the grinding container 2, the agitator shaft 3, the separating system 4, the inlet 5, the outlet 6, the grinding disks 8 and the horizontal axis 13 of the agitator shaft can also be seen.
  • the grinding chamber 7 refers to the entire space inside the grinding container that can be occupied by the material to be ground. However, the grinding chamber 14 is a subcategory of the grinding chamber and is drawn in as a border with dashed lines.
  • the agitator shaft forms a rotor disk 15 at its end facing the separating system 4, which delimits the actual grinding chamber from the separating system.
  • the rotor disk 15 is equipped with rotor bars 16 which protrude—often finger-like—from it and are spaced apart from one another as seen in the circumferential direction and form slots between them. These overlap the separating system 4 and, overall, form a quasi-cavity that accommodates the separating system 4 .
  • the rotor disk 15 can advantageously be slotted into a slot area 17 radially below the rotor bars, so it then also has an axially permeable opening radially below the rotor bars 16, which extends into the actual shaft.
  • This design of the rotor disk with the rotor bars 16 is shown schematically by the 2 illustrated. This design makes a noticeable further contribution to increasing the mobility of the grinding media.
  • the rotor disc 15 has a smaller diameter than the grinding discs 8 or than the imaginary body of rotation made up of the individual bodies forming the grinding discs, such as wings or the like.
  • FIG 3 shows a second variant of the agitator mill 1.
  • Square agitator shaft bushings 12 are used.
  • the sectional view on the left also shows the shape of the grinding disc.
  • the rest of the structure of the agitator mill corresponds to the structure of the first variant.
  • the grinding chamber height a, the grinding chamber length b and the radial distance c are also shown here.
  • each grinding disk consists of a plurality of vanes which are arranged one behind the other in the circumferential direction in a rotational alignment and are separated from one another by continuous slots in the circumferential direction.
  • the dimensions of the grinding media are coordinated here, because the slot size, the size of the grinding media and the radial gap distance between the grinding discs and the inner wall of the grinding container or the inner peripheral surface of the grinding container must be selected in such a way that the grinding media remain mobile despite friction and self-locking forces and the blades do not block .

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
EP22191606.7A 2021-09-09 2022-08-23 Broyeur agitateur Pending EP4147782A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021123408.5A DE102021123408A1 (de) 2021-09-09 2021-09-09 Rührwerksmühle

Publications (1)

Publication Number Publication Date
EP4147782A1 true EP4147782A1 (fr) 2023-03-15

Family

ID=83049948

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22191606.7A Pending EP4147782A1 (fr) 2021-09-09 2022-08-23 Broyeur agitateur

Country Status (6)

Country Link
US (1) US20230128694A1 (fr)
EP (1) EP4147782A1 (fr)
JP (1) JP2023039916A (fr)
CN (1) CN115780029A (fr)
BR (1) BR102022017870A2 (fr)
DE (1) DE102021123408A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022122868A1 (de) 2022-09-08 2024-03-14 Netzsch-Feinmahltechnik Gmbh Rührwerksmühle mit besonderen mitnehmern

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10792665B2 (en) * 2016-10-18 2020-10-06 Willy A. Bachofen Ag Agitator ball mill

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3431553A1 (de) 1984-08-28 1986-03-13 Draiswerke Gmbh, 6800 Mannheim Ruehrwerksmuehle
DE69525334T2 (de) 1994-04-11 2002-07-11 ERICH NETZSCH GMBH & CO HOLDING KG Reibmühle
WO2009024159A1 (fr) 2007-08-17 2009-02-26 Bühler AG Broyeur agitateur

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10792665B2 (en) * 2016-10-18 2020-10-06 Willy A. Bachofen Ag Agitator ball mill

Also Published As

Publication number Publication date
KR20230037459A (ko) 2023-03-16
DE102021123408A1 (de) 2023-03-09
US20230128694A1 (en) 2023-04-27
CN115780029A (zh) 2023-03-14
JP2023039916A (ja) 2023-03-22
BR102022017870A2 (pt) 2023-03-21

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