EP3946741B1 - Broyeur à boulets à agitateur - Google Patents

Broyeur à boulets à agitateur Download PDF

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Publication number
EP3946741B1
EP3946741B1 EP21715572.0A EP21715572A EP3946741B1 EP 3946741 B1 EP3946741 B1 EP 3946741B1 EP 21715572 A EP21715572 A EP 21715572A EP 3946741 B1 EP3946741 B1 EP 3946741B1
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Prior art keywords
stator
rotor
tools
milling tools
length
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EP21715572.0A
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German (de)
English (en)
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EP3946741A1 (fr
Inventor
Eduard Nater
Achim Sturm
Andreas Rieche
Thomas VERSNIK
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Buehler AG
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Buehler AG
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    • 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
    • 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
    • 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
    • B02C17/20—Disintegrating members
    • 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
    • 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
    • B02C17/1835—Discharging devices combined with sorting or separating of material
    • B02C17/184—Discharging devices combined with sorting or separating of material with separator arranged in discharge path of crushing zone
    • 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 present disclosure relates to an agitator ball mill and in particular to an agitator ball mill in which improved fluidization and distribution of the grinding aids within the agitator ball mill is ensured.
  • RWKM agitator bead mill
  • Agitator bead mills for example, are also from the documents DE 4 008 472 A1 , DE 19 638 354 A1 and WO 2006/116338 A2 known.
  • an agitator ball mill which has a rotor with agitator tools which protrude into a grinding chamber.
  • the agitator ball mill also has counter-bars attached to sliding bars.
  • the counter-rods each have the same length.
  • the shifting bars can be adjusted at the top and/or bottom, so that the counter-bars attached to the shifting bars can be pushed into the grinding chamber and pulled out of the grinding chamber.
  • the DE 196 38 354 A1 describes an agitator ball mill with a cylindrical outer stator and a rotor arranged in the outer stator, which form a grinding chamber. Grinding bodies are arranged in the grinding chamber. The grinding chamber tapers in steps towards an inlet opening. Agitator bolts are attached to the outer stator and to the rotor, with the agitator bolts arranged in the area of the tapering grinding chamber being shortened.
  • the present disclosure includes an agitator mill for treating free-flowing material to be ground, with a circular-cylindrical external stator and an agitator, which is mounted rotatably about a common central axis, with a circular-cylindrical rotor.
  • the rotor is arranged inside the outer stator and a grinding chamber is formed between the rotor and the outer stator.
  • the grinding chamber has a constant width between the outer stator and the rotor.
  • a feed channel is located in front of the grinding chamber, through which the material to be ground can be fed into the grinding chamber.
  • a discharge channel is provided through which the material to be ground can leave the grinding chamber.
  • a through-flow direction through the grinding chamber is thus defined by the feed and discharge channel, which direction extends from the feed channel to the discharge channel.
  • the grinding chamber is at least partially filled with auxiliary grinding bodies. Furthermore, rotor grinding tools are attached to the rotor and extend radially in the direction of the outer stator. Furthermore, external stator milling tools are attached to the external stator, which protrude radially with a length into the milling chamber.
  • the external stator grinding tools are arranged in a circumferentially spaced apart manner and form rows. These rows are arranged parallel to each other on the outer stator along the central axis.
  • the external stator grinding tools are also arranged in longitudinal rows, ie perpendicular to the circumferential direction and along the central axis.
  • the external stator grinding tools thus form longitudinal rows in the direction of the central axis, ie along the direction of flow, and also rows perpendicular thereto, ie in a circle around the circumference of the external stator.
  • the external grinding tools of at least one row, preferably three rows, of external stator grinding tools on the side of the grinding chamber facing away from the feed channel have a greater radial length than the remaining external stator grinding tools.
  • the external stator grinding tools at least in the rearmost row(s) in the circumferential direction in the flow direction, i.e. all external stator grinding tools that lie on circles around the circumference of the external stator that are furthest away from the feed channel, have a greater radial length than the other external stator grinding tools.
  • the outer stator preferably has six to twelve rows of outer stator milling tools in the circumferential direction and/or eight to twenty longitudinal rows of outer stator milling tools.
  • the lower row or rows are the rows with external stator grinding tools greater length.
  • the outer stator milling tools of each row in the circumferential direction can each have the same length.
  • the length of the outer stator grinding tools with a greater length can be longer by a factor of 1.5 to 2.5, preferably 1.75 to 2.25 and particularly preferably 2.0 than the length of the other outer stator grinding tools.
  • the length of the remaining external stator grinding tools can be between 5 and 20 mm, preferably between 7 and 15 mm.
  • the rotor milling tools each preferably have the same length, for example 20 mm to 40 mm.
  • the external stator grinding tools and/or the rotor grinding tools are preferably designed in the form of pins.
  • the pins preferably have a cylindrical shape, with the length being at least as great as the diameter of the pins.
  • a separator may be provided within the rotor.
  • the discharge channel for discharging the free-flowing material to be ground can be arranged behind the separating device.
  • the invention is based on the figure 1 described. It shows a cross section through an agitator ball mill according to an example of the invention.
  • FIG. 1 The following is referred to a vertical agitator bead mill (RWKM).
  • FIG 1 Reference is made, ie to a RWKM according to a preferred embodiment, which is arranged during operation in such a way that a central axis 5 is oriented vertically and the direction of flow runs from top to bottom.
  • the direction parallel to the central axis 5 is called the axial direction.
  • the invention can also be used in horizontal or inclined RWKM.
  • RWKM shown has an agitator with a substantially cylindrical rotor 1, the rotor 1 having an outer diameter D1 and an inner diameter d1.
  • the rotor 1 is rotatably mounted about the center axis 5 . According to the embodiment shown, this is aligned vertically.
  • the RWKM has an outer stator 2 with an outer stator inner diameter D2, which surrounds the rotor 1.
  • the inner wall of the outer stator 2 facing the rotor 1 is circular-cylindrical.
  • the rotor 1 and the outer stator 2 are coaxial with the central axis 5.
  • the rotor 1 also has a circular-cylindrical outer wall.
  • a grinding chamber 4 is formed between the outer stator 2 and the rotor 1, which has the same radial thickness over the entire height and in the circumferential direction.
  • the grinding chamber 4 thus has a constant ring gauge.
  • the ground material to be treated is introduced into the grinding chamber 4 via a feed channel 7 .
  • the RWKM has an inner stator 22 with inner stator outer diameter d22, which forms a discharge space 23 with the radially inner side of the rotor 1.
  • the discharge space 23 is via a channel in the figure 1 is formed below the rotor 1, connected to the grinding chamber 4.
  • the dispersed product thus flows from the grinding chamber 4 via the channel into the discharge chamber 23 to a separating device 3, which is arranged above the inner stator 22.
  • the separating device 3 is set up to hold back grinding aids that may have been entrained.
  • a discharge channel 6 is located centrally within the separating device 3 and discharges the finished product from the machine.
  • Rotor grinding tools 11 are attached to the outer wall of the rotor 1 and protrude into the grinding chamber 4 in the radial direction.
  • External stator grinding tools 21, 211 are attached to the inner wall of the external stator 2 and protrude into the grinding chamber 4 in the radial direction.
  • the tools 11, 21, 211 are offset in such a way that when the rotor 1 rotates, there is a sufficient distance between them.
  • the tools 11, 21, 211 are preferably attached in longitudinal rows parallel to the central axis, ie vertically in the embodiment shown, and in the circumferential direction on the circular-cylindrical outer wall of the rotor 1 or the circular-cylindrical inner wall of the outer stator 2.
  • the tools 11, 21, 211 are preferably equally spaced apart from one another in the longitudinal and/or circumferential direction. In other words, the tools 11, 21, 211 are evenly distributed.
  • Each longitudinal row of tools 11, 21, 211 preferably has six to twenty tools 11, 21, 211 per row.
  • six to twelve tools 11, 21, 211 are preferably attached in the circumferential direction per row of tools 11, 21, 211.
  • the invention is not linked to the number of tools 11, 21, 211 in the longitudinal and/or circumferential direction and can be applied to any RWKM with stator and rotor tools.
  • the length below designates the radial length of the tools 11, 21, 211, ie the length that the tools 11, 21, 211 extend radially into the grinding chamber 4, ie in the direction of the outer stator 2 or in the direction of the rotor 1 protrude.
  • the rotor tools 11 have the same length.
  • the rotor tools 11 generally have a length of about 20 mm to 40 mm.
  • the external stator grinding tools 211 point in the rear region of the external stator 2 in the direction of flow, i.e. the lower region in the embodiment shown (cf. figure 1 ) a greater length.
  • the rear area faces the channel connecting grinding chamber 4 and discharge chamber 23 .
  • the rows of external stator grinding tools 21, 211 each have the same length in the circumferential direction. At least the one in the figure 1
  • the lowest (in the direction of flow rear) row of external stator grinding tools 211 preferably the lowest two rows and particularly preferably the lowest three rows, have a greater length than the remaining external stator grinding tools 21. If viewed in the vertical direction, more than one row of external stator grinding tools 211 have a greater length , these outer stator milling tools 211 preferably have the same length.
  • a gradual increase in the length of the external stator grinding tools 21, 211 in the direction of flow can also be expedient.
  • the length of the outer stator grinding tools 211 with greater length can be longer by a factor of 1.5 to 2.5, preferably 1.75 to 2.25 and particularly preferably by a factor of 2.0 than the length of the other outer stator grinding tools 21.
  • the length of the remaining external stator grinding tools 21 can be between 5 and 20 mm, preferably between 7 and 15 mm.
  • the ratio of the rotor outer diameter D1 to the outer stator inner diameter D2, which diameters are respectively measured without considering the grinding tools 11, 21, 211, is defined as follows 0.6 ⁇ D 1 / D 2 ⁇ 0.95 .
  • the ratio of the inner stator outer diameter is d22, where d22 is ignoring the in 1 pins shown is defined to rotor inner diameter d1 as follows 0.8 ⁇ i.e 22 / i.e 1 ⁇ 0.95 .
  • the ratio of the number of External stator milling tools 211 with greater length to the number of the remaining external stator milling tools 21 between 0.1 and 0.5.
  • the outer stator 2 has two outer stator milling tools 211 with a greater length and eight remaining outer stator milling tools 21 .
  • the ratio of the height at which external stator grinding tools 211 protrude with greater length into the grinding chamber 4 to the overall height of the grinding chamber 4 (length of the outer stator 2) is between 0.05 and 0.3, preferably between 0.1 and 0.2.
  • the height at which the longer outer stator grinding tools 211 protrude into the grinding chamber 4 is to be understood as the extension of the length of the longer outer stator grinding tools 211 in the axial direction, i.e. the area of the grinding chamber 4 in which the length in which the outer stator grinding tools 211 are arranged with greater length in the grinding chamber. In other words, in the case of a vertical agitator mill, this corresponds to the height of the process zone (grinding chamber 4), which is covered by the longer external stator grinding tools 211.
  • the ratio of the length by which external stator grinding tools 211 project into the grinding chamber 4 with greater length to the external stator inner diameter D2 is preferably between 0.05 and 0.4, particularly preferably between 0.2 and 0.3. With an extension of the external stator grinding tools 211 with a greater length in the grinding chamber 4 of 150 mm and an external stator inner diameter D2 of 550 mm, a ratio of 0.27 results.
  • auxiliary grinding bodies can occur in the rear area in the direction of flow due to the drag forces, and in particular in vertical RWKM also due to gravity, during the grinding or dispersing process. Even with horizontal or inclined RWKM, auxiliary grinding bodies can become displaced due to the drag forces accumulate in a part of the grinding chamber, especially in the flow direction downwards.
  • the extended external stator grinding tools in the rear area in the flow direction result in improved fluidization of the auxiliary grinding bodies in the entire RWKM. Accumulation of grinding aids in a part of the machine can be effectively prevented. If there is an accumulation of grinding media during operation, this can be loosened up noticeably and set in motion by using longer pins in the lower area of the outer stator.
  • the arrangement enables a lower power consumption in the case of low-viscosity products with low viscosities (thickness) and/or less tackiness.
  • vibrations occurring in the machine due to accumulations of grinding aids can be reduced.
  • the milling tools of the present disclosure are glued in place. This prevents procedural manipulation of the mill during operation.
  • the tools are sealed to the stator by gluing, which avoids a reduction in the cooling surface.
  • the tools of the outer stator are preferably provided in two different, defined lengths. Thus there is only one step of the tool length in the axial direction. This also ensures constant grinding conditions over the entire grinding time.
  • the invention can also be used in an existing RWKM, in particular in a RWKM whose external stator grinding tools are designed to be exchangeable.
  • the external stator grinding tools of the rows in the circumferential direction that are remote from the feed channel are replaced by external stator grinding tools that have a correspondingly greater length.
  • the external stator grinding tools of a desired number of rows are replaced, ie at least the tools of the rearmost row in the direction of flow, preferably those of the three rearmost rows.
  • the invention also includes individual features in the figures, even if they are shown there in connection with other features and/or are not mentioned above.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Claims (12)

  1. Broyeur agitateur destiné à traiter un produit à broyer fluide, avec un stator extérieur cylindrique circulaire (2),
    un agitateur monté de manière à pouvoir tourner autour d'un axe central commun (5) avec un rotor cylindrique circulaire (1), dans lequel le rotor (1) est disposé à l'intérieur du stator extérieur (2), et
    dans lequel une chambre de broyage (4) est conçue entre le rotor (1) et le stator extérieur (2), dans lequel une direction d'écoulement est définie dans la chambre de broyage (4), qui s'étend d'un canal d'alimentation (7) à un canal d'évacuation (6),
    dans lequel la chambre de broyage (4) présente entre le stator extérieur (2) et le rotor (1) une largeur constante,
    dans lequel la chambre de broyage (4) est remplie au moins partiellement avec des corps de broyage auxiliaires, dans lequel plusieurs outils de broyage de rotor (11) sont montés sur le rotor (1), qui s'étendent dans la direction du stator extérieur (2),
    dans lequel plusieurs outils de broyage de stator extérieur (21, 211) sont montés sur le stator extérieur (2), qui font saillie radialement avec une certaine longueur dans la chambre de broyage (4), et
    dans lequel les outils de broyage de stator extérieur (21, 211) sont disposés à une certaine distance les uns à côté des autres dans la direction périphérique et forment des rangées, et
    ces rangées sont disposées parallèlement les unes aux autres sur le stator extérieur (2) le long de l'axe central,
    dans lequel les outils de broyage de stator extérieur (211) d'au moins une rangée, de préférence de trois rangées d'outils de broyage de stator extérieur (211) sur le côté opposé au canal d'alimentation (7) de la chambre de broyage présentent une longueur radiale plus importante que celle des autres outils de broyage de stator extérieur (21), et
    dans lequel les outils de broyage de stator extérieur (21, 211) de chaque rangée présentent respectivement la même longueur dans la direction périphérique.
  2. Broyeur agitateur selon la revendication 1, dans lequel le stator extérieur (2) présente de six à douze rangées d'outils de broyage de stator extérieur (21, 211) dans la direction périphérique et/ou de huit à vingt rangées longitudinales d'outils de broyage de stator extérieur (21, 211) dans la direction de l'axe central (5).
  3. Broyeur agitateur selon l'une quelconque des revendications précédentes, dans lequel un rapport d'un certain nombre d'outils de broyage de stator extérieur (211) avec la plus grande longueur radiale sur un certain nombre d'autres outils de broyage de stator extérieur (21) est compris entre 0,1 et 0,5.
  4. Broyeur agitateur selon l'une quelconque des revendications précédentes, dans lequel le broyeur agitateur est disposé en fonctionnement de telle manière que l'axe central (5) est orienté verticalement et la direction d'écoulement dans la chambre de broyage (4) va de haut en bas, de sorte que la rangée inférieure ou les rangées inférieures dans la direction périphérique sont les rangées avec les outils de broyage de stator extérieur (211) de plus grande longueur.
  5. Broyeur agitateur selon l'une quelconque des revendications précédentes, dans lequel la longueur des outils de broyage de stator extérieur (211) avec la plus grande longueur radiale est plus longue d'un facteur de 1,5 à 2,5, de préférence de 1,75 à 2,25 et le plus préférentiellement de 2,0 que la longueur des autres outils de broyage de stator extérieur (21).
  6. Broyeur agitateur selon l'une quelconque des revendications précédentes, dans lequel la longueur des autres outils de broyage de stator extérieur (21) est comprise entre 5 et 20 mm, de préférence entre 7 et 15 mm.
  7. Broyeur agitateur selon l'une quelconque des revendications précédentes, dans lequel les outils de broyage de stator extérieur (11) présentent respectivement la même longueur.
  8. Broyeur agitateur selon l'une quelconque des revendications précédentes, dans lequel les outils de broyage de stator extérieur (21, 211) et/ou les outils de broyage de rotor (11) sont réalisés sous la forme de tiges.
  9. Broyeur agitateur selon la revendication 8, dans lequel les tiges présentent une forme cylindrique, dans lequel la longueur est au moins égale au diamètre des tiges.
  10. Broyeur agitateur selon l'une quelconque des revendications précédentes, dans lequel un dispositif de séparation (3) est prévu à l'intérieur du rotor (1).
  11. Broyeur agitateur selon l'une quelconque des revendications précédentes, dans lequel pour un rapport d'un diamètre extérieur de rotor D1 sur un diamètre intérieur de stator extérieur D2 s'applique 0,6 ≤ D 1 / D 2 ≤ 0,95 .
    Figure imgb0007
  12. Broyeur agitateur selon l'une quelconque des revendications précédentes, dans lequel pour un rapport d'un diamètre extérieur de stator intérieur d22 sur un diamètre intérieur de rotor d1 s'applique 0,8 ≤ d 22 / d 1 ≤ 0,95 .
    Figure imgb0008
EP21715572.0A 2020-03-27 2021-03-26 Broyeur à boulets à agitateur Active EP3946741B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP20166428 2020-03-27
PCT/EP2021/057973 WO2021191430A1 (fr) 2020-03-27 2021-03-26 Broyeur à billes à agitateur

Publications (2)

Publication Number Publication Date
EP3946741A1 EP3946741A1 (fr) 2022-02-09
EP3946741B1 true EP3946741B1 (fr) 2023-08-23

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EP21715572.0A Active EP3946741B1 (fr) 2020-03-27 2021-03-26 Broyeur à boulets à agitateur

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Country Link
US (1) US20230158511A1 (fr)
EP (1) EP3946741B1 (fr)
JP (1) JP7454066B2 (fr)
KR (1) KR20220151215A (fr)
CN (1) CN114096354B (fr)
WO (1) WO2021191430A1 (fr)

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Publication number Publication date
CN114096354A (zh) 2022-02-25
EP3946741A1 (fr) 2022-02-09
CN114096354B (zh) 2023-08-15
JP2023521302A (ja) 2023-05-24
KR20220151215A (ko) 2022-11-14
US20230158511A1 (en) 2023-05-25
WO2021191430A1 (fr) 2021-09-30
JP7454066B2 (ja) 2024-03-21

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