EP2704836B1 - Broyeur et procédé de broyage d'une matière au moyen de ce broyeur - Google Patents

Broyeur et procédé de broyage d'une matière au moyen de ce broyeur Download PDF

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Publication number
EP2704836B1
EP2704836B1 EP11769784.7A EP11769784A EP2704836B1 EP 2704836 B1 EP2704836 B1 EP 2704836B1 EP 11769784 A EP11769784 A EP 11769784A EP 2704836 B1 EP2704836 B1 EP 2704836B1
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EP
European Patent Office
Prior art keywords
grinding
container
mill
mill according
grinding container
Prior art date
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Active
Application number
EP11769784.7A
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German (de)
English (en)
Other versions
EP2704836A2 (fr
Inventor
Michael Dvorak
Herman LEUTGÄB
Michael Lange
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.)
Reishauer AG
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Reishauer AG
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Publication of EP2704836A2 publication Critical patent/EP2704836A2/fr
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Publication of EP2704836B1 publication Critical patent/EP2704836B1/fr
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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
    • B02C17/04—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 with unperforated container
    • B02C17/08—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 with unperforated container with containers performing a planetary movement

Definitions

  • the invention relates to a mill with a motor-driven grinding container and free-moving grinding media therein.
  • Such mills are used in particular for the fine grinding of mineral materials, for example for the production of nanoparticles or nanopowders from such materials.
  • the efficiency between the introduced energy and the energy actually used for breaking the ground material is unsatisfactory. This results in a high wear of the grinding media and the associated contamination of the ground material.
  • the poor efficiency can also have a high temperature development in the millbase, so that an active cooling of the millbase is required to avoid unwanted property changes or reactions of the ground material.
  • WO-A-2009/026990 there is disclosed a laboratory vibratory mill with skewed grinding crushers which are rotated about a vertical axis by a drive having a gearbox with a horizontally oriented plane of movement.
  • the Mahlbechers in relation to the plane of motion of the oscillating drive conditional trajectories of the grinding media in Mahlbecher the front Mahlbecherböden should be included as a stop and grinding surface in the crushing process.
  • the drive is designed with a three-dimensional action. It is thus given a relatively complicated construction with the respective inclined grinding bowl, in addition to that no optimal movements are effected on the grinding media.
  • the invention has for its object to avoid these disadvantages and to provide a mill of the type mentioned above, which is characterized by an efficient generation in particular of nanoparticles and by a good energy efficiency.
  • the invention further provides that the milling container, which can be rotated about its central axis, is rotated by the drive system of the mill about an axis arranged outside the container. This allows it to be moved in two dimensions with a simple drive. Its circular path is arranged in a horizontal plane. The two-dimensional movement thus takes place along the y-axis and the x-axis, whereby an up and down movement in the z-direction would also be possible.
  • the drive system comprises a bearing housing having a drive shaft and a rotary arm, one end of which is rotatably secured to the drive shaft and the other end carries the grinding container, said by means of a gear transmission relative to the rotating arm at the same speed and in opposite Direction of rotation as the turning arm is rotated.
  • This causes the grinding container during its rotation about the axis of rotation of the rotary arm at the same time remains unrotatable about its own central axis.
  • the cuboid grinding container is expediently formed with 85 ° to 95 ° amount inner angles. To simplify the production, it is advantageous if the grinding container has a rectangular cross-section, wherein the side walls may have a slight curvature toward the container center towards the container center.
  • the freely movable grinding media in the grinding container are designed according to the invention as grinding balls, which helps to minimize the friction losses during the grinding process. It is in the sense of an optimized Mahlclients advantageous if the grinding media have a multimodal size distribution. It may also be advantageous in this sense if the number of grinding balls is so dimensioned that their capacity corresponds to about 1/3 of the total contents of the grinding container.
  • the mill according to the invention is also distinguished by the fact that its mode of operation is easily adaptable to the grinding process provided in each case. In particular, it is easily possible to drive the grinding container at intervals and / or with alternating changes of direction.
  • the grinding container 1 for receiving the ground material is cuboid, with a bottom 2, side walls 3a to 3d and a lid 4, which is removable if necessary.
  • the grinding container 1 has flat walls and a rectangular cross-section and is driven by a drive system 5, which is composed of a bearing housing 6 with a drive shaft 7 and a rotary arm 8 with a gear transmission 9a, 9b, 9c.
  • the grinding container 1 is provided with a trunnion 10 attached to its bottom 4, which is mounted at the outer end of the rotary arm 8. The latter is attached at its other end to the drive shaft 7 and rotates about the axis A at a rotational speed ⁇ A in a vertical plane on a circular path 11 with radius R. In this case, the grinding container 1 is taken and thereby two-dimensionally in the direction of the y-axis and x-axis moved.
  • the grinding container 1 is a number of grinding balls 12 whose size and texture is matched with the ground material, and their capacity corresponds to about 1/3 of the total volume of the grinding container 1. Such a filling amount contributes in practice to optimize the grinding result. It is in this case often advantageous if the grinding balls 12 have a multimodal size distribution.
  • the grinding balls are spherical. But they can also be egg-shaped.
  • the grinding balls 12 are freely movable in the grinding container 1. Since this is non-rotatable about its central axis B, they are hurled back and forth in operation from wall to wall, without a significant portion of their kinetic energy, for example, by collision of the grinding balls is destroyed.
  • the inventive mill thus has a high energy efficiency, which brings not only economic, but also procedural advantages. The latter result from the reduction of friction losses and the associated heat development in the millbase. The avoidance of friction-related impurities and / or heat-related reactions leads to an improvement in the quality of the ground product.
  • the two-dimensional trajectory 12 of the grinding container is horizontal. However, it can also be three-dimensional in the context of the invention by subjecting the grinding container to vibrations in the three dimensions.
  • the arrangement according to the invention also makes it possible to drive the grinding container at intervals and / or with alternating changes of direction. It is also possible within the scope of the invention to design the cross-section of the grinding container 1 slightly different from the rectangular shape, wherein the inner angle of the container preferably vary between 85 ° and 95 °. It is also possible to provide the grinding container 1 with slightly curved or slightly beveled side walls, which have a curvature or slope towards the container center towards the container bottom.
  • the invention further enables the design of the grinding process as a continuous process, namely by simultaneous feeding, pulling out or pressing and sifting out the ground material. in this connection the supply and suction lines are preferably housed in the removable lid 4 of the grinding container 1.
  • the inventive mill is particularly suitable for the production of submicron and nanopowder from macroscopic brittle materials, such as in particular diamond, oxides, or carbides, and for the production of composite powders and with nanoparticles and / or nanotubes, especially CNT reinforce materials, the softer Matrix consists mainly of metals, light metals and their alloys or of plastics and / or mixtures thereof.
  • the material to be ground should be kept constantly in motion so as to make the grinding process more efficient and avoid caking.
  • the invention is sufficiently demonstrated with the illustrated embodiment. Of course, it could still be illustrated by other variants. For example, instead of a gear transmission for driving the mill, toothed belts or the like could be used. With the mill according to the invention also regrind, which has been removed and does not yet have the desired grain size, should be fed again to a grinding process.
  • the grinding container is moved on a circular path in a horizontal plane.
  • the grinding container could be moved by the drive system of the mill in all three dimensions, for example, is still a parent shaking movement.

Landscapes

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

Claims (11)

  1. Broyeur comprenant une enveloppe (1) entraîné par un moteur et des éléments (12) broyeurs, qui y sont mobiles librement, l'enveloppe (1) étant à peu près parallélépipédique et pouvant être déplacée dans deux dimensions par le système (5) d'entraînement ayant un arbre (7) d'entraînement du broyeur, caractérisé en ce que
    l'enveloppe (1) est pourvue d'un tourillon (10) porteur, qui est fixé à son fond (4) et qui est monté à l'extrémité extérieure d'un bras (8) tournant, le bras (8) tournant étant fixé à son autre extrémité à l'arbre (7) d'entraînement et tournant autour de l'axe (A) de l'arbre (7) d'entraînement, cet axe (A) se trouvant dans un plan vertical, et l'enveloppe (1) étant mobile dans un plan horizontal à l'extérieur de cet axe (A) sur une trajectoire (11) circulaire, tandis qu'elle ne peut pas tourner autour de son axe (B) médian, en étant entraînée en rotation à la même vitesse (ωB=ωA) de rotation que le bras (8) tournant, mais en sens contraire au bras (8) tournant.
  2. Broyeur suivant la revendication 1, caractérisé en ce que le système (5) d'entraînement a une boîte (6) de palier avec l'arbre (7) d'entraînement et le bras (8) tournant, dont une extrémité est fixée à l'arbre (7) d'entraînement et dont l'autre extrémité porte l'enveloppe (1), celle-ci étant, au moyen d'un train d'engrenage (9a, 9b, 9c), entraînée en rotation par rapport à l'arbre (8) tournant, à la même vitesse de rotation que le bras tournant mais en sens contraire à celui du bras tournant.
  3. Broyeur suivant la revendication 1 ou 2, caractérisé en ce que l'enveloppe (1) est constituée en ayant des angles intérieurs, allant de préférence de 85° à 95°.
  4. Broyeur suivant la revendication 3, caractérisé en ce que l'enveloppe (1) a une section transversale rectangulaire.
  5. Broyeur suivant la revendication 4, caractérisé en ce que les parois (3a à 3d) latérales de l'enveloppe (1) ont, par rapport au fond (2) de l'enveloppe, une légère courbure ou une inclinaison par rapport au milieu de l'enveloppe.
  6. Broyeur suivant l'une des revendications précédentes 1 à 5, caractérisé en ce que le nombre des éléments de broyage est tel qu'il remplit environ 1/3 de l'espace total de contenance de l'enveloppe (1).
  7. Broyeur suivant l'une des revendications précédentes 1 à 6, caractérisé en ce que les éléments (12) de broyage ont une répartition de dimension multimodale.
  8. Broyeur suivant l'une des revendications précédentes 1 à 7, caractérisé en ce que, dans l'enveloppe (1), sont constitués des éléments (12) de broyage mobiles librement sous la forme de boulets de broyage.
  9. Broyeur suivant la revendication 1, caractérisé en ce que l'enveloppe (1) est mobile à intervalle et avec changement de direction alternée.
  10. Broyeur suivant l'une des revendications 1 à 9, caractérisé en ce qu'un broyage s'effectue sous gaz protecteur sous-vide ou sous gaz réactif et/ou excité.
  11. Procédé pour broyer du produit à broyer par un broyeur suivant les revendications précédentes 1 à 10, caractérisé par envoi, retrait ou refoulement simultané, ainsi que tamisage du produit à broyer, des conduits d'envoi et d'aspiration étant prévus, de préférence dans le couvercle (4) de l'enveloppe (1) .
EP11769784.7A 2010-10-07 2011-10-05 Broyeur et procédé de broyage d'une matière au moyen de ce broyeur Active EP2704836B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH16442010A CH704018B1 (de) 2010-10-07 2010-10-07 Mühle sowie Verfahren zum Mahlen von Mahlgut mit derselben.
PCT/EP2011/004957 WO2012045446A2 (fr) 2010-10-07 2011-10-05 Broyeur et procédé de broyage d'une matière à broyer au moyen de ce broyeur

Publications (2)

Publication Number Publication Date
EP2704836A2 EP2704836A2 (fr) 2014-03-12
EP2704836B1 true EP2704836B1 (fr) 2018-06-27

Family

ID=44799978

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11769784.7A Active EP2704836B1 (fr) 2010-10-07 2011-10-05 Broyeur et procédé de broyage d'une matière au moyen de ce broyeur

Country Status (3)

Country Link
EP (1) EP2704836B1 (fr)
CH (1) CH704018B1 (fr)
WO (1) WO2012045446A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL406540A1 (pl) * 2013-12-16 2015-06-22 Politechnika Krakowska im. Tadeusza Kościuszki Napęd ultraenergetycznego młyna pulsacyjno-rotacyjnego

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009026990A1 (fr) * 2007-07-14 2009-03-05 Retsch Gmbh Broyeur vibrant de laboratoire avec godets de broyage inclinés

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE624660C (de) * 1934-06-21 1936-01-25 Wilhelm Mauss Vorrichtung zum Mahlen von Erzen und aehnlichen Stoffen in senkrechten Trommeln
US2561037A (en) 1945-08-14 1951-07-17 William T Stanley Finishing method and apparatus
FR1084223A (fr) * 1953-05-28 1955-01-18 Ct D Etudes Et De Rech S De L Broyeur à boulets
ITRM20070364A1 (it) * 2007-06-27 2008-12-28 Assing S P A Nuovo mulino industriale ad attrito per produrre nanomateriali attraverso processi meccanochimici

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009026990A1 (fr) * 2007-07-14 2009-03-05 Retsch Gmbh Broyeur vibrant de laboratoire avec godets de broyage inclinés

Also Published As

Publication number Publication date
WO2012045446A3 (fr) 2012-06-07
EP2704836A2 (fr) 2014-03-12
CH704018B1 (de) 2014-08-29
WO2012045446A2 (fr) 2012-04-12
CH704018A2 (de) 2012-04-13

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