EP3297761B1 - Broyeur à billes à agitateur et procédé de fonctionnement d'un broyeur à billes à agitateur - Google Patents

Broyeur à billes à agitateur et procédé de fonctionnement d'un broyeur à billes à agitateur Download PDF

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Publication number
EP3297761B1
EP3297761B1 EP16714215.7A EP16714215A EP3297761B1 EP 3297761 B1 EP3297761 B1 EP 3297761B1 EP 16714215 A EP16714215 A EP 16714215A EP 3297761 B1 EP3297761 B1 EP 3297761B1
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EP
European Patent Office
Prior art keywords
grinding
agitator
shaft
ball mill
agitator shaft
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Active
Application number
EP16714215.7A
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German (de)
English (en)
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EP3297761A1 (fr
Inventor
Klaus Ott
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Netzsch Feinmahltechnik GmbH
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Netzsch Feinmahltechnik GmbH
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Publication of EP3297761A1 publication Critical patent/EP3297761A1/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
    • B02C17/16—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
    • B02C17/16—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
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B02C17/166—Mills in which a fixed container houses stirring means tumbling the charge of the annular gap type

Definitions

  • the present invention relates to a stirred ball mill according to the preamble of claim 1, and to a method for operating such a stirred ball mill.
  • Agitated ball mills are used to crush products using grinding media.
  • the grinding media When discharging product from the stirred ball mill, the grinding media should remain in the grinding chamber of the stirred ball mill. This is achieved in particular by a targeted separation of the grinding media within the agitator ball mill.
  • Sieve arrangements are provided, for example, in order to remove any grinding media present in the exiting product stream. Especially when using the smallest grinding media, there is often a blockage of the screen, which in turn leads to an increase in pressure within the agitator ball mill and to shutdown the agitator ball mill.
  • One possible cause for the blockage of the screen is insufficiently dispersed particles, which are present as agglomerates of a size that exceed the slot width of the filter / screen.
  • Another cause is that the grinding media are swept by the product flow to the screen and in combination with the product form a so-called filter cake on the screen, which causes a pressure increase.
  • EP 370022B1 describes a pin agitator ball mill, in which a largely exclusive return of the grinding media at the same time as possible uniform distribution of the grinding media in the grinding chamber.
  • the Stiftrhackwelle is at least partially hollow cylindrical and forms an outer grinding chamber and an internal grinding chamber.
  • the outer grinding chamber and the inner grinding chamber formed essentially annular cylindrical.
  • the outer grinding chamber is located between the inner wall of the grinding container and the outer circumferential surface of the studded rotor.
  • the rotor also has pins on its inner circumferential surface as stirring elements. In the interior of the rotor protrudes into a cylindrical inner stator, on whose outer circumferential surface also pins are arranged as stirring elements.
  • the inner grinding chamber is formed between the inner circumferential surface of the rotor and the outer circumferential surface of the cylindrical mecanicstators. Through the flow of the grinding chamber from the outside inwards a return of the grinding media is achieved from the inside to the outside due to centrifugal forces.
  • a similar pin agitator ball mill is in the EP 1943022 B1 described. It is provided that the pins are arranged on the outer circumferential surface of the rotor overlapping each other on a helical line such that they exert in the rotational drive of the rotor in a rotational direction of the grinding media in a rotational direction of the grinding body opposite to the flow direction impulse and thus a transfer prevent the grinding media in the interior between the inner circumferential surface of the rotor and the inner stator.
  • Mahlgut- discharge channel which is located within the rotor and is limited by the rotor and the stator, there are therefore no or very few grinding media.
  • the DE 102007043670 describes an agitator ball mill with a separator arranged in front of the Mahlgutauslass within the stirring shaft, which has at least one spiral. After having achieved a reliable separation of the grinding media from the material to be ground even after a few turns of the spiral, it may be advantageous to drive the separating device by means of its own drive.
  • the DE102010053484 A1 also discloses an agitating ball mill with a hollow pin rotor. Within the cavity of the pin rotor, a separator is arranged, which additionally comprises a dynamic element for generating a stream of material.
  • the grinding media flow in the outer grinding chamber between the outer surface of the stirrer shaft and the inner circumferential surface of the grinding container along and occur according to the documents EP 370022B1 and DE102010053484 A1 around the open stirrer shaft end in each case into a separation space in the interior of the stirrer shaft.
  • the rotating stirrer shaft causes via centrifugal forces a pre-separation of grinding media and product suspension.
  • the grinding media are thrown back out through slits in the agitator shaft into the grinding zone.
  • the object of the invention is to achieve a reliable separation of the smallest grinding media.
  • the invention relates to a stirred ball mill with a cylindrical grinding container.
  • the invention further relates to a method for operating such a stirred ball mill.
  • the agitator ball mill has a Mahlguteinlass and a Mahlgutauslass.
  • the grinding material inlet is formed at a first end region of the grinding container, and the grinding material outlet is formed at an opposite second end region of the grinding container.
  • a separator is arranged before the Mahlgutauslass.
  • a stirring shaft connected to a drive via a drive shaft is arranged.
  • pins are formed as stirring elements that transmit the drive energy of the stirring shaft at least partially loosely disposed within the grinding container grinding media.
  • the stirring shaft is at least partially hollow cylindrical.
  • An end of the agitator shaft opposite the drive is at least partially open.
  • the separation device is in contrast to the prior art not within, but arranged outside the agitator shaft.
  • the separator also uses the same drive as the stirring shaft.
  • an inner shaft is formed in the hollow cylindrical interior of the agitator shaft, which is also driven by the drive of separator and agitator shaft.
  • a first end of the inner shaft is fixed coaxially to the drive shaft and / or coaxially to the agitator shaft within the hollow cylindrical interior of the agitator shaft.
  • the opposite second end of the inner shaft protrudes from the hollow cylindrical interior of the stirring shaft.
  • the separator is arranged.
  • the arrangement of the separator outside the agitator shaft this can be formed with a larger diameter than in a corresponding arrangement within a hollow cylindrical agitator shaft. Due to the larger diameter, such a separator has a higher peripheral speed and thus produces higher, acting on the grinding media centrifugal forces.
  • the agitator ball mill according to the invention has a grinding zone within the grinding container, in particular in the region between the stirring shaft and the inner lateral surface of the grinding container. Furthermore, in the region of the separating device or in the region of the Mahlgutauslasses a spatially separated from the grinding zone separation zone is formed, in which the grinding media are separated from the millbase.
  • a flow compensation chamber for grinding media educated.
  • the displaced by the separator from a Mahlgutauslass Scheme grinding media can at least partially escape into the flow compensation space between the inner shaft and agitator shaft.
  • the grinding media are returned from the separation zone to the milling zone. If the flow forces in the grinding zone are too high, the grinding media can escape into a flow compensation space within the stirring shaft.
  • the inner shaft is conically formed within the agitator shaft.
  • the outer diameter of the inner shaft preferably decreases in the direction of the grinding material inlet or in the direction of the separating device.
  • the grinding media within the flow compensation chamber receive an additional flow component in the direction of the grinding stock inlet.
  • the stirring shaft comprises passage openings for the grinding bodies and / or the material to be ground. Through these passage openings grinding media, which are located in the flow compensation space, get back out, especially in the grinding zone of the agitator ball mill.
  • the volume of the flow compensation chamber is between 10% and 90% of the volume of the grinding chamber, more preferably the volume of the flow compensation chamber is between 10% and 40% of the volume of the grinding chamber.
  • a second flow in the direction of the grinding zone is applied to the grinding bodies by the separating device.
  • a transition region is formed between the milling zone and the separation zone.
  • a first flow of ground material and grinding bodies meets a second flow of grinding bodies in a second direction of flow directed from the grinding material outlet to the grinding material inlet in a first flow direction directed from the grinding material inlet to the grinding material outlet.
  • the media of the second flow are at least partially directed toward the first media-media product flow in the direction of the first media Flow compensation space is forced, whereby within the transition region, a pressure relief takes place.
  • the grinding media then flows back along the length of the flow compensation chamber into the region of the grinding zone which is outside the stirring shaft, in particular into a region of the grinding zone which is formed between the stirring shaft and an inner jacket surface of the grinding container , This can most easily be done in the area of the grinding material entering the agitator ball mill, since there the concentration of grinding media is lowest.
  • the separating device consists of a cylindrical rotor.
  • the separating device consists of a rotor disk arranged on the inner shaft. Rotor fingers are arranged on the outer edge of the rotor disk. The rotor fingers are aligned in particular in the direction of the Mahlgutauslasses, that is opposite to the stirring shaft.
  • the rotor disk has passage openings for the grinding bodies, which can thereby enter into a rotor cage formed by the rotor disk and the rotor fingers.
  • a separating screen is further arranged within the rotor cage.
  • the rotor of the separator sucks the Mahlgut- MahlSystem- mixture on the mill inlet side, classifies the grinding media and urges them back into the milling zone, the grinding media as already described advantageously can escape into the flow compensation space in the interior of the pin rotor and preferably only in a drive close area be transferred with a lower grinding media concentration in the grinding zone.
  • the separator Due to the arrangement of the separator outside the agitator shaft, this can be performed with a larger diameter than a arranged within a stirring shaft separator.
  • the increase in the diameter of the separator causes at the same speed of the stirring shaft an advantageous increase in the forces acting on the grinding media centrifugal forces, so that even small grinding media can be classified with sufficient certainty by the separator.
  • the separating device may have a diameter which is greater than the outer diameter of the stirring shaft.
  • the method may comprise, as an alternative or in addition to the described features, one or more features and / or properties of the device described above.
  • the device may alternatively or additionally comprise one or more features and / or properties of the described method.
  • FIG. 1 shows a first embodiment of a stirred ball mill 1a according to the invention.
  • the agitator ball mill 1a comprises a grinding container 2 with an agitator 3 arranged therein, which is rotationally driven via a drive shaft 4.
  • the grinding container 2 defines an interior space 2 *.
  • the left side in the figure arranged end of the grinding container 2 represents the mill inlet side 14, on which a Mahlguteinlass (not shown) is arranged.
  • a product outlet 20 At the opposite end of the grinding container 2 is a product outlet 20 arranged.
  • stirring elements 5 3 pins 6 are arranged on the outer circumferential surface of the coaxial with the drive shaft 4 extending agitator.
  • an inner shaft 10a is formed at the free, opposite the drive end 11 outside of the agitator 3, a separator 12th is arranged.
  • the interior 2 * of the grinding container 2 is divided by this arrangement, in particular in a grinding zone MZ and a separation zone TZ.
  • the grinding bodies MK are urged by the product flow or the flow of the Mahl stresses- Mahlgut- suspension S in the direction of separation zone TZ.
  • the separating device 12 urges the grinding bodies MK from the separating zone TZ back into the grinding zone MZ.
  • the grinding bodies MK can escape from this compacted transitional area UB into the compensation zone in the flow compensation chamber 13a within the interior 9a of the agitator 3. This causes in particular a pressure relief in the transition region UB.
  • the separating device 12 is arranged in particular as a rotor disk 15 with openings 16 and on the rotor disk 15, facing the product outlet 20 rotor fingers 17, which together with the rotor disk 15 is a so-called one-sided form an open rotor cage or separation rotor 18, wherein the rotor cage in particular has a cylindrical shape.
  • the MahlSystem- Mahlgut- suspension S can flow from the mill inlet side 14 in a separation region TB of the separator 12 and does not have to flow outside the separation rotor 18 of the separator 12 over. So that the grinding media MK can flow unhindered out of the separation region TB, the separation zone TZ is not considered as a grinding chamber.
  • the amount of grinding media MK is calculated according to the volume of the grinding zone.
  • the volume of the grinding zone is 100%. Normally up to 95% of grinding media is filled.
  • the separating rotor 18 of the separating device 12 sucks on the mill inlet side 14, classifies the grinding bodies MK and forces them back into the grinding zone MZ, wherein the grinding bodies MK can escape into the flow compensation chamber 13a within the agitator shaft 3.
  • the material to be ground P is discharged from the agitator ball mill 1a via the product outlet 20 via a sieve 19 arranged inside the rotor cage 18.
  • first grinding the meal P within the grinding stock / suspension body suspension S takes place with the aid of grinding bodies MK and an agitator 3 with pins 6 in a grinding zone MZ.
  • the pins 6 on the agitator shaft 3 are used in particular for the activation of the grinding bodies MK.
  • the grinding bodies are accelerated by the pins 6, so that the grinding stock P located between the grinding bodies MK is comminuted and / or dispersed.
  • the grinding zone MZ is downstream of a separation zone TZ in the flow direction R.
  • the separation is achieved by a separator 12 comprising a rotor cage assembly.
  • the so-called separation rotor 18 is arranged and fixed to an inner shaft 10a.
  • the inner shaft 10a represents an extension of the drive shaft 4 for the agitator shaft 3 within the agitator shaft 3. This arrangement is advantageous in several respects.
  • the separation rotor 18 can be designed with a large diameter, for example with a diameter which is greater than the diameter of the agitator shaft 3.
  • the separation rotor generates one of the flow direction R of the Ground stock grinding media suspension S counterflow.
  • the grinding bodies MK are ejected from the separating region TB within the separating rotor 18 and forced back into the grinding zone MZ.
  • a circulation flow builds up via the interior 9a of the agitator shaft 3, via which, in particular, grinding bodies MK are fed back again into the grinding chamber MR between the outer lateral surface of the agitator 3 and the inner lateral surface of the grinding container 2.
  • the interior 9a of the agitator shaft 3 represents a flow compensation chamber 13a or a buffer volume for the grinding media MK.
  • the media MK are forced through the separator 12 in the transition region UB, by dodging the grinding media MK in the flow compensation chamber 13a within the agitator 3, the separation zone TZ additionally relieved of grinding media MK.
  • the agitator shaft 3 has outlet slots or passage openings 8 which extend substantially to the inlet region 14 of the agitator ball mill 1a, so that the internal circulation of the grinding media MK over the entire grinding zone MZ can be done to the mill inlet side 14.
  • the arrangement according to the invention advantageously uses only a single drive for the agitator shaft 3 and for driving the separating rotor 18 of the separating device 12. Furthermore, there is no discharge of the product P by the rotating drive shaft, as in many of the known systems, whereby special seals can be omitted. With the inventive, inexpensive and technically simplified design even the smallest grinding media MK can be safely and effectively separated from a grinding material Mahl stresses- suspension S.
  • FIG. 2 shows a second embodiment of a stirred ball mill 1b according to the invention. This corresponds essentially to the first embodiment of an agitator ball mill 1a according to the invention, so that the description of FIG. 1 is referenced.
  • the inner shaft 10b is at least partially conical.
  • the cone of the inner shaft 10b tapers from the drive side or inlet side 14 in the direction of the separating rotor 18 and the product outlet 20.
  • the cylinder jacket 7 of the agitator shaft 3 in contrast, as in the embodiment 1a according to FIG. 1 a cylindrical shape. This has the effect that the cross section of the interior 9b between the inner shaft 10b and the agitator shaft 3 is lower in a first, drive-near region BA than in a second region BE at the open end of the agitator shaft 3 in the immediate vicinity of the separation rotor 18.
  • the speed of the grinding bodies MK increases the further they approach the drive side or the first drive region BA.
  • the length of the equalization zone in the flow compensation chamber 13b results in a backflow of the grinding bodies MK into the grinding zone MZ or the grinding chamber MR between the outer jacket surface of the agitator 3 and the inner jacket surface of the grinding container 2. This can most easily be done in the region of the Product entry into the agitator ball mill 1b, that is, at the opposite end of the separator 3 agitator 3, since there the concentration of grinding media MK least and the speed of the grinding media MK within the interior 9b or flow compensation chamber 13b is the highest.

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

Claims (16)

  1. Broyeur agitateur à billes (1a, 1b) avec un récipient de broyage (2) présentant une entrée de matière à broyer et une sortie de matière à broyer (20), avec un dispositif séparateur (12) disposé devant la sortie de matière à broyer (20), dans lequel un arbre agitateur (3) relié à un entraînement par le biais d'un arbre d'entraînement (4) est disposé dans le récipient de broyage (2), des tiges (6) étant formées en tant qu'éléments agitateurs (5) sur une surface d'enveloppe extérieure de l'arbre agitateur (3), lesquelles transmettre l'énergie d'entraînement de l'arbre agitateur (3) au moins partiellement à des corps de broyage (MK) disposés librement à l'intérieur du récipient de broyage (2), dans lequel l'arbre agitateur (3) présente au moins partiellement une forme de cylindre creux et dans lequel une extrémité de l'arbre agitateur (3) opposée à l'entraînement est au moins partiellement ouverte, caractérisé en ce qu'un arbre interne (10a, 10b) est formé dans l'espace intérieur en forme de cylindre creux (9a, 9b) de l'arbre agitateur (3), dans lequel une première extrémité de l'arbre interne (10a, 10b) est fixé coaxialement sur l'arbre d'entraînement (4) et/ou coaxialement sur l'arbre agitateur (3) à l'intérieur de l'espace intérieur en forme de cylindre creux (9a, 9b) de l'arbre agitateur (3), dans lequel la deuxième extrémité (11) opposée de l'arbre interne (10a, 10b) fait saillie hors de l'espace intérieur en forme de cylindre creux (9a, 9b) de l'arbre agitateur (3) et dans lequel le dispositif séparateur (12) est disposé sur la deuxième extrémité (11) de l'arbre interne (10a, 10b) faisant saillie.
  2. Broyeur agitateur à billes (1a, 1b) selon la revendication 6, dans lequel un flux en direction de la zone de broyage (MZ) peut être appliqué aux corps de broyage (MK) à l'aide du dispositif séparateur (12).
  3. Broyeur agitateur à billes (1a, 1b) selon la revendication 7, dans lequel l'espace de régulation de débit (13a, 13b) à l'intérieur de l'arbre agitateur (3) sert à recevoir au moins une partie des corps de broyage (MK) refluant en direction de la zone de broyage (MZ).
  4. Broyeur agitateur à billes (1a, 1b) selon la revendication 8, dans lequel les corps de broyage (MK) situés dans l'espace de régulation de débit (13a, 13b) peuvent être amenés par les ouvertures de passage (8) dans une région de la zone de broyage (MZ) dans l'espace intérieur du récipient de broyage (2) à l'extérieur de l'arbre agitateur (3).
  5. Broyeur agitateur à billes (1a, 1b) selon l'une des revendications précédentes, dans lequel le dispositif séparateur (12) comporte un rotor cylindrique ou un disque de rotor (15) avec des doigts de rotor (17), dans lequel les doigts de rotor (17) sont dirigés à distance du disque de rotor (15), à l'opposé de l'arbre agitateur (3).
  6. Broyeur agitateur à billes (1a, 1b) selon la revendication 10, dans lequel des ouvertures de passage (16) pour les corps de broyage (MK) sont formées dans le disque de rotor (15). deuxième direction opposée s'échappent au moins partiellement dans l'espace de régulation de débit (13a, 13b) formé entre l'arbre interne (10a, 10b) et le diamètre intérieur de l'arbre agitateur (3).
  7. Procédé selon la revendication 14 ou 15, dans lequel les corps de broyage (MK) sont transférés dans la zone de broyage (MZ) à l'extérieur de l'arbre agitateur (3) par le biais des ouvertures de passage (8) de l'arbre agitateur (3), en particulier dans lequel les corps de broyage (MK) sont transférés dans la zone de broyage (MZ) dans une région de l'arbre agitateur (3) proche de l'entraînement.
EP16714215.7A 2015-05-19 2016-02-24 Broyeur à billes à agitateur et procédé de fonctionnement d'un broyeur à billes à agitateur Active EP3297761B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015107789.2A DE102015107789B3 (de) 2015-05-19 2015-05-19 Rührwerkskugelmühle und Verfahren zum Betreiben einer Rührwerkskugelmühle
PCT/DE2016/000079 WO2016184445A1 (fr) 2015-05-19 2016-02-24 Broyeur à billes-agitateur et procédé pour faire fonctionner un broyeur à billes-agitateur

Publications (2)

Publication Number Publication Date
EP3297761A1 EP3297761A1 (fr) 2018-03-28
EP3297761B1 true EP3297761B1 (fr) 2019-05-15

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EP16714215.7A Active EP3297761B1 (fr) 2015-05-19 2016-02-24 Broyeur à billes à agitateur et procédé de fonctionnement d'un broyeur à billes à agitateur

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EP (1) EP3297761B1 (fr)
DE (1) DE102015107789B3 (fr)
WO (1) WO2016184445A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019123138A1 (de) * 2019-08-29 2021-03-04 Netzsch-Feinmahltechnik Gmbh Rührwelle für eine Rührwerkskugelmühle

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3716587C1 (de) * 1987-05-18 1988-04-28 Draiswerke Gmbh Ruehrwerksmuehle
EP1943022B1 (fr) * 2005-10-11 2010-03-31 Bühler AG Broyeur melangeur
DE102007043670A1 (de) * 2007-09-13 2009-04-02 Netzsch-Feinmahltechnik Gmbh Rührwerkskugelmühle
CN201558723U (zh) * 2009-12-05 2010-08-25 昆山密友粉碎设备有限公司 高性能砂磨机
DE102010053484A1 (de) * 2010-12-04 2012-06-06 Netzsch-Feinmahltechnik Gmbh Dynamisches Element für die Trenneinrichtung einer Rührwerkskugelmühle

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* Cited by examiner, † Cited by third party
Title
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Publication number Publication date
EP3297761A1 (fr) 2018-03-28
DE102015107789B3 (de) 2016-07-07
WO2016184445A1 (fr) 2016-11-24

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