EP3297761A1 - Rührwerkskugelmühle und verfahren zum betreiben einer rührwerkskugelmühle - Google Patents
Rührwerkskugelmühle und verfahren zum betreiben einer rührwerkskugelmühleInfo
- Publication number
- EP3297761A1 EP3297761A1 EP16714215.7A EP16714215A EP3297761A1 EP 3297761 A1 EP3297761 A1 EP 3297761A1 EP 16714215 A EP16714215 A EP 16714215A EP 3297761 A1 EP3297761 A1 EP 3297761A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaft
- grinding
- agitator
- ball mill
- rotor
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000000227 grinding Methods 0.000 claims abstract description 171
- 239000000463 material Substances 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims description 35
- 238000000926 separation method Methods 0.000 claims description 31
- 230000007704 transition Effects 0.000 claims description 9
- 238000011144 upstream manufacturing Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 18
- 239000000725 suspension Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 3
- 238000003801 milling Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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 and a
- Agitator ball mills are used to make products with the help of
- 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.
- a variety of systems are known. 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 370 ⁇ 22 ⁇ 1 describes a pin agitator ball mill, in which a largely exclusive return of the grinding media is carried out while at the same time as uniform as possible distribution of the grinding media in the grinding chamber.
- the Stiftrandwelle 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
- the rotor also has pins on its inner circumferential surface 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 described in EP 1943022 B1. 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.
- DE 102007043670 describes an agitator ball mill with a separating device arranged in front of the grinding stock outlet within the stirring shaft and having at least one spiral. After you spiral even with few
- DE102010053484 A1 likewise discloses an agitator ball mill with a hollow pin rotor. Within the cavity of the pin rotor is a
- Separating device arranged, which additionally comprises a dynamic element for generating a material flow.
- Mahlmorn be increased. Since the gap width structurally not less than 3 mm to 5 mm can be performed, in particular a complete separation of grinding media with a diameter of less than / equal to 0.2 mm is difficult, or not possible.
- the object of the invention is to achieve a reliable separation of the smallest grinding media.
- Claims 1 and 13 include. Further advantageous embodiments are described by the subclaims.
- 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
- the grinding material inlet is formed at a first end region of the grinding container and at an opposite second
- Mahlgutauslass is arranged a separator.
- 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 stirrer shaft. At the protruding, second end of the inner 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
- the agitator ball mill according to the invention has within the
- Outer jacket surface of the inner shaft is a flow compensation chamber for grinding media educated.
- the displaced by the separator from a Mahlgutauslass Scheme grinding media can at least partially in the
- 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. This gives the grinding media within the
- the stirring shaft comprises
- 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 grinding media of the second flow are at least partially directed towards the first millbase / grinding media product flow in the direction of product flow
- Flow compensation space is forced, whereby within the transition region, a pressure relief takes place.
- 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 grinding zone, the grinding media as already described advantageously in the
- Flow compensation space in the interior of the pin rotor can escape and preferably only in a drive-near area with lesser
- the separating device may have a diameter which is greater than the outer diameter of the stirring shaft.
- the method may alternatively or in addition to those described
- Features include 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 device
- FIG. 1 shows a first embodiment of a device according to the invention
- Figure 2 shows a second embodiment of an inventive
- FIG. 1 shows a first embodiment of a device 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
- 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.
- the agitator 3 is formed as a hollow cylinder and comprises in its cylinder jacket. 7
- Passage openings 8 In the interior 9a of the agitator 3 is coaxial and in
- Separating device 12 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 interior 9a of the agitator 3, in particular the space between the cylinder jacket 7 of the agitator 3 and the inner shaft 0a serves as a flow compensation chamber 13a for the grinding media MK.
- 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 transition region UB between the separation zone TZ and the grinding zone MZ thus two largely opposite flows meet each other. So that they do not interfere with one another, the grinding bodies MK can move out of this compacted transitional area UB into the compensation zone in the
- Flow compensation chamber 13a depending on the pressure and flow conditions, leads to 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
- the separating device 12 is in particular as a rotor disk 15 with openings
- the product outlet 20 facing 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.
- Separation region TB of the separator 12 flow and must not outside of
- Separating rotor 18 of the separator 12 flow past. 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 after the
- 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.
- a sieve 19 arranged inside the rotor cage 18.
- 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 in the flow direction R a separation zone TZ
- the separation is achieved by a separator 12 comprising a rotor cage assembly.
- the so-called separation rotor 18 is at a
- Inner shaft 10a arranged and fixed.
- 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 made with a large diameter, for example with a
- Diameter which is greater than the diameter of the agitator shaft 3. This increases relative to the agitator shaft 3, the peripheral speed and thus the centrifugal force, whereby a better separation of the grinding body MK is due to centrifugal forces.
- the separation rotor generates one of the flow direction R of the Ground stock grinding media suspension S counterflow. As a result, the grinding bodies MK are thrown out of the separating region TB within the separating rotor 8 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 body MK is returned to the grinding space MR between the outer circumferential surface of the agitator 3 and the
- 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 shaft 3, the separation zone TZ additionally relieved of grinding media MK.
- the agitator shaft 3 is in the position of being shown
- Outlet slots or passage openings 8 which extend substantially to the inlet region 14 of the agitator ball mill 1 a, so that the inner circulation of the grinding body MK over the entire grinding zone MZ to the
- Mill inlet side 14 can take place.
- 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
- Figure 2 shows a second embodiment of an inventive
- Agitator ball mill 1 b This corresponds essentially to the first one
- 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 shell 7 of the agitator shaft 3 has the same as in
- Embodiment 1a according to Figure 1 has a cylindrical shape. This causes the cross section of the inner space 9b between the inner shaft 10b and the
- Agitator shaft 3 in a first, drive-near area BA is lower than in a second area BE at the open end of the agitator shaft 3 in the immediate
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
Description
Claims
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 (de) | 2015-05-19 | 2016-02-24 | Rührwerkskugelmühle und verfahren zum betreiben einer rührwerkskugelmühle |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3297761A1 true EP3297761A1 (de) | 2018-03-28 |
EP3297761B1 EP3297761B1 (de) | 2019-05-15 |
Family
ID=55661003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16714215.7A Active EP3297761B1 (de) | 2015-05-19 | 2016-02-24 | Rührwerkskugelmühle und verfahren zum betreiben einer rührwerkskugelmühle |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3297761B1 (de) |
DE (1) | DE102015107789B3 (de) |
WO (1) | WO2016184445A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112439512A (zh) * | 2019-08-29 | 2021-03-05 | 耐驰精细研磨技术有限公司 | 用于搅拌机球磨器的搅拌轴 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3716587C1 (de) * | 1987-05-18 | 1988-04-28 | Draiswerke Gmbh | Ruehrwerksmuehle |
DE502005009341D1 (de) * | 2005-10-11 | 2010-05-12 | Buehler Ag | Rührwerksmühle |
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 |
-
2015
- 2015-05-19 DE DE102015107789.2A patent/DE102015107789B3/de active Active
-
2016
- 2016-02-24 EP EP16714215.7A patent/EP3297761B1/de active Active
- 2016-02-24 WO PCT/DE2016/000079 patent/WO2016184445A1/de active Application Filing
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112439512A (zh) * | 2019-08-29 | 2021-03-05 | 耐驰精细研磨技术有限公司 | 用于搅拌机球磨器的搅拌轴 |
CN112439512B (zh) * | 2019-08-29 | 2022-03-08 | 耐驰精细研磨技术有限公司 | 用于搅拌机球磨器的搅拌轴 |
Also Published As
Publication number | Publication date |
---|---|
WO2016184445A1 (de) | 2016-11-24 |
DE102015107789B3 (de) | 2016-07-07 |
EP3297761B1 (de) | 2019-05-15 |
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