EP0570854A2 - Rührwerksmühle mit einer dynamischen Mahlkörperabtrennung - Google Patents

Rührwerksmühle mit einer dynamischen Mahlkörperabtrennung Download PDF

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Publication number
EP0570854A2
EP0570854A2 EP93107850A EP93107850A EP0570854A2 EP 0570854 A2 EP0570854 A2 EP 0570854A2 EP 93107850 A EP93107850 A EP 93107850A EP 93107850 A EP93107850 A EP 93107850A EP 0570854 A2 EP0570854 A2 EP 0570854A2
Authority
EP
European Patent Office
Prior art keywords
grinding
agitator
cutting disc
mill according
agitator mill
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.)
Withdrawn
Application number
EP93107850A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0570854A3 (enrdf_load_stackoverflow
Inventor
Wendelin Kneisl
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0570854A2 publication Critical patent/EP0570854A2/de
Publication of EP0570854A3 publication Critical patent/EP0570854A3/xx
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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
    • B02C17/161—Arrangements for separating milling media and ground material

Definitions

  • the invention relates to an agitator ball mill according to the preamble of claim 1.
  • the precoating capacity be it due to very small auxiliary grinding bodies due to the amount of ground material being pumped through or a corresponding increase in viscosity
  • auxiliary grinding bodies are compacted on the separating device, which leads to high wear on the agitator and on the auxiliary grinding bodies and can also lead to complete blockage of the agitator ball effort.
  • viscosity increases and thixotropy can therefore jeopardize the effectiveness of the separation device. Grinding auxiliary bodies on these sieve cartridges or sieves are also broken to an increased extent.
  • the gap height must be made very small due to the grinding aids used today (> 0.2 mm).
  • a disadvantage of this arrangement is the comparatively high flow velocity and thus high precoat forces at the gap entrance, which preferably feeds broken grinding media, which have become small due to abrasion, into the gap, which crushes there and thus contributes to increased wear of the dynamic gap and makes it impossible to use micro grinding media makes.
  • the invention now strives for a solution for the separation of regrind and auxiliary grinding bodies, which avoids the disadvantages described above in the known agitator ball mills. Accordingly, the invention consists primarily in that as a separating device, a rotating cutting disc in which a sieve or sieves are attached, the effective surface of which is ideally attached perpendicular to the axial agitator shaft, which can have any slot widths, and a grinding ring attached to the grinding ring of the annular gap thereof Gap width is adjustable, is provided.
  • the millbase suspension preferably exits through the sieves due to the different flow resistance. For this reason, it is possible to minimize the gap height of the annular gap, so that the smallest auxiliary grinding bodies can be used, which are then not subjected to high flow forces directly at the separation gap.
  • the separating device has the additional advantage that broken auxiliary bodies, which have become too small, are not conveyed into the annular gap, which significantly improves the wear behavior of the annular gap.
  • the above-mentioned behavior is particularly effective when the diameter of the annular gap is approximately equal to that of the largest agitator diameter. Because of the mass-proportional centrifugal force, large grinding aids of the grinding aid fraction used move around the annular gap, which cannot be conveyed into the annular gap. Those auxiliary grinding bodies which are conveyed to the effective sieve surface by the flow are exposed to various forces. Due to the pull-in condition, the flow force acts perpendicular to the effective surface, which is ideally arranged perpendicular to the axial axis. The centrifugal force acts in the radial direction and forms an angle of 90 degrees with the flow force. This results in a resultant in the radial direction.
  • the centrifugal force increases in the radial direction proportional to the radius, so that the resultant grows in the radial direction and grinding aid bodies and fragments get back into the stress zone.
  • This effect is most favorable when the effective screen surface forms an angle of 90 degrees with the axial axis. If you incline this angle to the axial axis, the resultant becomes ever smaller. If the angle is 0 or 180 degrees, the effective sieve surface is parallel to the radial axis as is the case with known agitator ball mills.
  • the new separating device can in principle be used in any conventional agitator ball mill and thus contributes to a higher output or throughput with less wear on auxiliary grinding bodies. For this reason, it can be a standing or a lying agitator ball mill, so it does not matter whether the axial axis is arranged vertically or horizontally.
  • the agitator ball mill shown in Fig. 1 has a box-shaped frame, not shown, to which a substantially cylindrical grinding container 11 and axially next to this a bearing housing 12 is attached.
  • the frame, not shown contains a drive motor, not shown, which is provided with a V-belt pulley and drives a stirrer 13 of a conventional type via V-belts.
  • the agitator 13 consists essentially of an agitator shaft 14 which is mounted in the bearing housing 12 and extends coaxially with the grinding container 11 almost through the entire grinding chamber 15 and is equipped with conventional stirring elements or stirring tools 16 such as disks or pins, or the entire agitator 13 is designed as a rotor.
  • the grinding container consists of a cylindrical inner cylinder 17 which surrounds a grinding chamber 15 and at the same time forms the grinding container wall 20 and which, according to FIG. 1, also forms the grinding container wall 20.
  • the separating device is formed by a separating disc 24 mounted on the agitator shaft 14 and an annular flange 25 on which the grist outlet 23 is located.
  • the separating gap or annular gap 27 belonging to the separating device is formed by a standing ring element fastened to the annular flange 25 with the counter ring surface 43 of the separating disk 24.
  • the diameter of the cutting disc 24 is equal to the diameter of the annular gap 27 and, in this embodiment, is larger than the largest diameter of the agitator 13. Particularly high shear and centrifugal forces are hereby introduced.
  • six screens 30 are attached whose screen surface, which corresponds to the active screen surface 32, is perpendicular to the axial grinding material flow 28.
  • the main advantages of the separating device according to the invention can be seen from FIGS. 2 and 3.
  • the six screens 30 attached have a much larger effective area 32 than the annular gap 27.
  • the effective area of the separating device is to be understood as the area which is provided with mesh screens 44 or with annular gaps located between separating rings. Due to the above-mentioned difference in the effective sieve area 32, the regrind flow 28 takes place predominantly through the see 30, the flow speed and thus the flow force 29 being significantly reduced, which enables high throughputs at a low operating pressure. Due to the mass-proportional centrifugal force 31, only large and therefore heavy grinding aid bodies 19 and grinding aid bodies or grinding aid body fragments that have not become too small due to abrasion come into the vicinity of the annular gap 27, so that this shows no wear whatsoever. Due to the design of the separating device according to the invention, grinding aids or fragments of grinding aids that have become too small are conveyed with the flow to the sieves 30 rotating with the cutting disk 24.
  • the rotary movement of See 30 prevents the above-mentioned small grinding aids and grinding aid fragments, as well as unused regrind 37 from becoming stuck or caught and prevents excessive pressure build-up in the case of thixotropic suspensions.
  • the flow force 29 acts perpendicular to the effective sieve surface 32 and the centrifugal force 31, which increases with increasing diameter, acts radially outwards on the active surface.
  • the invention is particularly easy to maintain if the ring flange 25 is provided with a large plug, which is not shown.
  • the cavity 34 behind the cutting disc 24 into which the outlet opening 23 opens and the rotating See 30, fastened by means of screws, is thus freely accessible for maintenance work, so that the See 30 can be exchanged very easily or cleaned if necessary.
  • the arrangement of the separating device on the bearing end of the grinding container 11 according to FIG. 1 has the further advantage that the manufacturing tolerances for an annular gap are not particularly high and the seal 33 on the bearing housing 12 is not subjected to high pressure and does not come into contact with any auxiliary grinding bodies 19 .
  • FIGS. 4 and 5 show in a simplified axial section the outlet area of an agitator ball mill in which the separating device according to the invention is attached to the end of the agitator 13 reaching into the grinding chamber 15.
  • the grinding container wall 20 and the agitator shaft 14 are hollow and can therefore be cooled.
  • the cutting disc 24 with the sieve or sieves 30 is attached to the end of the agitator shaft 14.
  • the fixed counter ring 26 is formed by the base plate 21.
  • a plug 35 makes it particularly easy to get to the screen or screens 30 for maintenance or cleaning.
  • the diameter of the annular gap 27 and the cutting disc 24 is the same and smaller than that of the stirring elements 16.
  • the sieve 30 can in turn be circular or made up of several individual sieves.
  • the effective sieve surface 32 is consequently perpendicular to the axial ground material flow 28 and are not flat to the cutting wheel surface 40 of the cutting wheel, so that they are not subject to any significant wear.
  • the cutting disc 24 is hollow, which significantly increases the effective screen area 32.
  • the separating gap 27 is not formed by the separating disc 24, but is arranged at another location, geometrically separated. In contrast to that of the cutting disc or stirring elements 16, its diameter is very small, so that larger tolerances can be specified during manufacture.
  • Fig. 6 shows an axial section of the outlet area of an agitator ball mill.
  • the grinding container 11 and the agitator 13 are of conventional construction and are therefore not or only partially shown.
  • the cutting disc 24 is mounted vertically on a shaft 45 which is mounted in a housing 46 and can be driven in rotation.
  • the diameter of the annular gap 27, cutting disc 24 and stirring elements 16 are approximately the same.
  • the sieve or sieves 30 are attached in the cutting disc 24.
  • the housing of the separating device is flanged into the base plate 21 and can be easily dismantled.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP93107850A 1992-05-22 1993-05-13 Rührwerksmühle mit einer dynamischen Mahlkörperabtrennung Withdrawn EP0570854A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924216939 DE4216939C2 (de) 1992-05-22 1992-05-22 Rührwerksmühle mit dynamischer Mahlkörperabtrennung
DE4216939 1992-05-22

Publications (2)

Publication Number Publication Date
EP0570854A2 true EP0570854A2 (de) 1993-11-24
EP0570854A3 EP0570854A3 (enrdf_load_stackoverflow) 1994-04-06

Family

ID=6459481

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93107850A Withdrawn EP0570854A2 (de) 1992-05-22 1993-05-13 Rührwerksmühle mit einer dynamischen Mahlkörperabtrennung

Country Status (2)

Country Link
EP (1) EP0570854A2 (enrdf_load_stackoverflow)
DE (1) DE4216939C2 (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0771591A4 (en) * 1995-06-06 2000-05-31 Kotobuki Giken Kogyo Kk WET BALL AGITATION GRINDER AND METHOD
CN103240154A (zh) * 2013-03-12 2013-08-14 苏有良 一种流体对冲击式研磨分散元件
CN115739319A (zh) * 2022-12-02 2023-03-07 江西高腾新材料有限公司 一种油墨砂磨机
CN116568404A (zh) * 2020-11-13 2023-08-08 耐驰精细研磨技术有限公司 搅拌式磨机
CN117960316A (zh) * 2024-03-22 2024-05-03 东莞市康博机械有限公司 一种多级研磨纳米级砂磨机及其砂磨方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0724439U (ja) * 1993-10-01 1995-05-09 三井鉱山株式会社 粉砕機の構造
RU2259884C1 (ru) * 2004-04-20 2005-09-10 Джанибеков Руслан Ахматович Барабанная мельница

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1482391B1 (de) * 1964-06-20 1970-08-20 Draiswerke Gmbh Ruehrwerksmuehle
DE1507493A1 (de) * 1965-03-19 1971-07-01 Draiswerke Gmbh Ruehrwerksmuehle
DE2037258C3 (de) * 1970-07-28 1974-10-17 Draiswerke Gmbh, 6800 Mannheim Geschlossene Rührwerksmühle
ES449975A1 (es) * 1976-07-20 1977-07-01 Oliver & Battle Sa Mejoras en los molinos de eje horizontal refrigerados, para productos predispersados de solidos en liquidos.
ES453093A2 (es) * 1976-11-06 1977-12-01 Oliver & Battle Sa Mejoras en molinos de eje horizontal refrigerados, para pro-ductos predispersados de solidos en liquidos.
CH621268A5 (enrdf_load_stackoverflow) * 1977-08-11 1981-01-30 Buehler Ag Geb
SU1131535A1 (ru) * 1981-12-05 1984-12-30 Предприятие П/Я В-8392 Мельница сухого измельчени
DE3437866A1 (de) * 1984-10-16 1986-04-17 Basf Farben + Fasern Ag, 2000 Hamburg Dispergierverfahren und ruehrwerksmuehle zu seiner durchfuehrung
DE3631375A1 (de) * 1986-09-15 1988-03-24 Netzsch Maschinenfabrik Ruehrwerksmuehle
DE3844380C1 (en) * 1988-12-30 1990-01-18 Erich Netzsch Gmbh & Co Holding Kg, 8672 Selb, De Agitator mill with separating device in a rotating cage

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0771591A4 (en) * 1995-06-06 2000-05-31 Kotobuki Giken Kogyo Kk WET BALL AGITATION GRINDER AND METHOD
CN103240154A (zh) * 2013-03-12 2013-08-14 苏有良 一种流体对冲击式研磨分散元件
CN116568404A (zh) * 2020-11-13 2023-08-08 耐驰精细研磨技术有限公司 搅拌式磨机
CN115739319A (zh) * 2022-12-02 2023-03-07 江西高腾新材料有限公司 一种油墨砂磨机
CN117960316A (zh) * 2024-03-22 2024-05-03 东莞市康博机械有限公司 一种多级研磨纳米级砂磨机及其砂磨方法
CN117960316B (zh) * 2024-03-22 2024-08-30 东莞市康博机械有限公司 一种多级研磨纳米级砂磨机及其砂磨方法

Also Published As

Publication number Publication date
EP0570854A3 (enrdf_load_stackoverflow) 1994-04-06
DE4216939C2 (de) 1995-01-26
DE4216939A1 (de) 1993-11-25

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