EP0058886B1 - Agitator mill - Google Patents

Agitator mill Download PDF

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Publication number
EP0058886B1
EP0058886B1 EP82101000A EP82101000A EP0058886B1 EP 0058886 B1 EP0058886 B1 EP 0058886B1 EP 82101000 A EP82101000 A EP 82101000A EP 82101000 A EP82101000 A EP 82101000A EP 0058886 B1 EP0058886 B1 EP 0058886B1
Authority
EP
European Patent Office
Prior art keywords
grinding
return
ground
channel
return channel
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.)
Expired
Application number
EP82101000A
Other languages
German (de)
French (fr)
Other versions
EP0058886A2 (en
EP0058886A3 (en
Inventor
Horst Gross
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.)
Draiswerke GmbH
Original Assignee
Draiswerke GmbH
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
Priority to DE19813106062 priority Critical patent/DE3106062A1/en
Priority to DE3106062 priority
Application filed by Draiswerke GmbH filed Critical Draiswerke GmbH
Publication of EP0058886A2 publication Critical patent/EP0058886A2/en
Publication of EP0058886A3 publication Critical patent/EP0058886A3/en
Application granted granted Critical
Publication of EP0058886B1 publication Critical patent/EP0058886B1/en
Expired legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00Disintegrating 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
    • B02C17/16Mills in which a fixed container houses stirring means tumbling the charge
    • B02C17/166Mills in which a fixed container houses stirring means tumbling the charge of the annular gap type

Description

  • The invention relates to an agitator mill according to the preamble of claim 1.
  • Such an agitator mill with a cylindrical grinding chamber between an agitator formed by an agitator shaft with a cylindrical hollow body on the one hand and the inner wall of the grinding container on the other hand is known from DE-B-1 184 188. Such very narrow cylindrical grinding spaces with a gap width of about 5 to 15 mm have the advantage that the individual particles of the ground material in suspension or dispersion are subjected to very uniform grinding and shear forces, so that the scatter in the fineness of grinding becomes very small . Since the radial extent of the actual grinding chamber is very small, the auxiliary grinding bodies accumulate in front of the separating device, since backflow is not sufficiently guaranteed, although the auxiliary grinding bodies move freely in the cylindrical grinding chamber in the flow of the auxiliary grinding media during the grinding process. From US-A-4 065 060 it is known to produce metal flakes in a ball mill. Metal particles, liquid and auxiliary grinding bodies are guided out of the grinding container through a sieving device in which the auxiliary grinding bodies are separated. They are transported back to the grinding container via a line in the grinding leg.
  • In order to achieve a return transport of the auxiliary grinding bodies from the grinding material discharge side, i.e. from the area of the separating device, it is already known from DE-C-1 507 504 to make holes in these disks in an agitator mill with an agitator formed by disks on an agitator shaft , which have a radial component, so that the grinding aid bodies entering into such a hole in a disk are accelerated downwards, thereby forming a kind of return channel.
  • From DE-A-2 811 899 an agitator mill with a grinding aid return is known, which works on the same principle, in which one or more return channels with a radial directional component are thus installed in the agitator.
  • This known principle of grinding aid return has the disadvantage that it is not possible to influence the return of the grinding aid, since the return flow takes place through the high-speed drive, which is practically inaccessible when the agitator mill is closed.
  • The invention is therefore based on the object of developing an agitator mill of the generic type in such a way that a return of the grinding auxiliary bodies is possible in a simple manner and the return can be influenced.
  • This object is achieved by the characterizing features of claim 1.
  • By returning the auxiliary grinding bodies through the return channel formed on the grinding container, the return is realized in a structurally very simple manner. Since the return channel is formed on the grinding container, an observation window can be attached in a very simple manner, through which an optical control is possible. Furthermore, the regrind also circulates through this channel, preferably the regrind particles which have not yet been comminuted sufficiently. The reason for this is that the auxiliary grinding bodies and also the corresponding portions of the ground material are returned by the centrifuging action of the agitator. A suction effect is generated by the opening of the return duct into the ground material inlet duct, which still supports the centrifuging effect. In addition, there is good premixing of regrind and auxiliary grinding media in the regrind inlet channel. The possibility of cross-section adjustment ensures that the agitator mill data, such as maximum energy utilization, i. H. high efficiency, is achievable. By changing the cross-section of the return channel, the grinding media return can be influenced as a function of pressure, viscosity, throughput speed, temperature and grinding media size, which in turn can optimally influence the desired fineness of the grinding stock.
  • Claims 3 to 5 represent particularly advantageous measures for the design of the return channel and the adjustability of the free cross section of the return channel. The adjustability of the free cross section can be regulated as a function of the operating parameters of the agitator mill, for example as a function of the power consumption of the drive motor.
  • The aforementioned suction effect, which supports the centrifugal effect, is further increased by the measures according to claim 6.
  • Further advantages of the invention result from the following description of an exemplary embodiment with reference to the drawing. In the drawing shows
    • Figure 1 is an agitator mill according to the invention and
    • Figure 2 shows the grinding vessel of the agitator mill in longitudinal section.
  • The agitator mill shown in the drawing has in the usual way a stand 1, on the top of which a projecting support arm 2 is attached, to which in turn a cylindrical grinding container 3 is attached. In the stand 1, an electric drive motor 4 is accommodated, which is provided with a V-belt pulley 5, of which a V-belt pulley 8, which is non-rotatably connected to an agitator shaft 7, can be driven in rotation by means of the V-belt 6.
  • The grinding container 3 has a cooling jacket 9 which is delimited by a cylindrical inner wall 10 and a cylindrical outer wall 12, which is arranged concentrically to the central longitudinal axis 11 of the grinding container 3. The inner wall 10 and the outer wall 12 are connected to one another at the top and bottom by annular flanges 13, 14. In this cooling jacket 9 thus formed, a cooling water connection 15 opens at the bottom and a cooling water outlet 16 at the top. A helically coiled pipeline 17 is arranged in the cooling jacket and bears against the inner wall 10 and the outer wall 12. In the subspaces of the cooling jacket 9 located between them, the cooling water is guided helically on its way from bottom to top, whereby the cooling effect is improved. On the other hand, the pipeline 17 itself can be used to transport a heat transfer medium, for example a heating medium.
  • The grinding container 3 is closed at its lower end by a base plate 18 which is attached to the lower flange 13, for example by means of screws 19. In the base plate 18, a grist inlet channel 20 is formed, which opens approximately concentrically into the interior 21 of the grinding container 3, and can be pumped through the grist from below into this interior 21.
  • On the stirrer shaft 7, which is arranged concentrically to the longitudinal axis 11, a cylindrical hollow body 22, which is closed on its ends, is concentrically attached, which together with the stirrer shaft 7 forms a stirrer. Between the hollow body 22 and the cylindrical inner wall 10 of the grinding container 3, a narrow cylindrical ring space 23 is delimited, which forms the actual grinding chamber. The radial width b of this cylindrical ring space 23 is approximately 5 to 10 mm.
  • The interior 21 of the grinding container 3 is - insofar as it is not filled by the hollow body 22 - 70 to 80% of its volume is filled with auxiliary grinding bodies 24, the diameter d of which is 0.1 to 3 mm. The following applies to the ratio of the gap width to the diameter of the auxiliary grinding bodies 24: b / d = 5 to 20.
  • At the upper end, the interior 21 of the grinding container 3 is closed off by a separating device 25. This separating device essentially consists of a ring 26 connected to the hollow body 22, that is to say rotating with the agitator, and a mating ring 27 fixedly connected to the grinding container 3, which overlap one another radially at a small axial distance, whereby a separating gap 28 is formed, the - determined by the axial distance between the ring 26 and the counter ring 27 - width is smaller than the smallest diameter d of the grinding aid body 24 used. This separation gap 28 opens into a discharge space 29 which is formed between the stationary counter ring 27 and a cover 30 of the grinding container 3 . From this discharge space 29, a regrind outlet line 31 opens out, through which the ground regrind is discharged. The separating device 25 is known for example from DE-PS 1 482 391. The cover 30 is detachably fastened together with the counter ring 27 by means of screws 32 to the upper flange 14 of the grinding container 3. The lid 30 itself is in turn attached to a holding device 33, which is attached to the underside of the support arm 2, so that the grinding container 3 can be flanged from below in a conventional manner.
  • On the outside of the outer wall 12, a tubular return channel 34 for regrind and auxiliary grinding body 24 is attached, which opens into the regrind inlet channel 20 below. In the upper region, the return channel 34 is connected to the upper end of the cylinder ring space 23 via a return pipe which extends approximately radially to the longitudinal axis 11. The inlet opening 36 of the nozzle 35 is thus just covered by the cylindrical hollow body 22. The free cross section of the connector 35 or the channel 34 can be changed. This is achieved in the embodiment according to FIG. That an adjustment element 37 in the form of a displaceable piston is inserted from the outside into the socket 35, which can be inserted at different depths into the socket 35, whereby the entry into the return channel is either completely released is covered or partially covered. This piston-shaped adjusting element is provided with a deflection surface 38, which deflects the ground material and in particular the grinding media on their way from the connection piece 35 into the channel 34 without any appreciable energy conversion. A position of the adjusting element 37 is indicated in dashed lines in which the free inlet cross section of the return channel 34 is approximately half closed.
  • The mode of operation is as follows: As mentioned, 70 to 80% of the free interior of the grinding container 3 is filled with auxiliary grinding bodies 24. The agitator shaft 7 and thus the hollow body 22 are driven at high speed by the drive motor 4, ie for example at a speed of 1,000 rpm. By means of a pump, millbase is pressed through the mill feed channel 20 into the interior 21, which, together with the auxiliary grinding bodies 24, rises upwards through the cylindrical ring space 23, that is to say the actual grinding chamber, the auxiliary grinding bodies 24 through the hollow body 22 Angular impulses are applied, which lead to intensive movements of the auxiliary grinding bodies 24 in the material to be ground, as a result of which a finely ground and dispersing effect is achieved in a known manner. When the auxiliary grinding bodies 24 reach the height of the inlet opening 36 of the return nozzle 35, at least most of them are pressed by the centrifugal action into the return nozzle and pass through this and the return channel 34, from where they again enter the grinding material inlet. Channel 20 arrive. In this they are already mixed intensively with the ground material pumped in, so that they are relatively evenly distributed in the regrind as they enter the interior 21 of the grinding container 3. Of course, regrind is also conveyed back through the return nozzle 35 and the return channel 34 and fed again to the grinding and dispersing effect. This is essentially ground material which has not yet been ground sufficiently finely and has therefore not yet emerged from the grinding container through the separating device 25. Due to the high centrifugal forces, which also act on the regrind particles, the larger, ie not yet sufficiently finely ground, particles are thrown into the wall area and therefore preferably reach the return nozzle 35. Since the regrind inlet channel 20 has a suction effect on the return Channel 34 is exerted, the centrifugal effect at the inlet opening 36 of the nozzle 35 is increased. This suction effect is further enhanced by the fact that the mill feed channel 20 widens at the mouth 39 of the channel 34 into the channel 20 — viewed in the pumping direction 40. In addition, a deflecting partial surface 41 is also formed at this point in order to keep the flow losses during transport of the auxiliary grinding bodies as low as possible.

Claims (6)

1. Agitating mill consisting of a grinding compartment (3) having an agitator which is arranged in the grinding compartment (3) and which can be driven at high speed and between which agitator and the wall of the grinding compartment (3) a narrow cylindrical ring space (23) is formed as the grinding chamber which is partially filled with auxiliary grinding bodies (24) and into one end of which leads an inlet channel (20) for material to be ground and at the other end of which a separating device (25) is provided for separating the ground material and auxiliary grinding bodies (24), characterised in that a return channel (34), fixed to the grinding compartment (3), leads out of the grinding chamber (cylindrical ring space 23) in the vicinity of the separating device (25) and into the vicinity of the inlet channel (20) for material to be ground, and that a slidable adjusting element (37) is arranged in the return channel (34) to vary the open cross-section of the return channel (34).
2. Agitating mill according to Claim 1, characterised in that the return channel (34) leads into the inlet channel (20) for material to be ground.
3. Agitating mill according to Claim 1 or 2, characterised in that the return channel (34), which is approximately in a radial plane, leads out of the grinding chamber (cylindrical ring space 23) via a return connection (35).
4. Agitating mill according to Claim 3, characterised in that the adjusting element (37) is arranged in the return connection (35).
5. Agitating mill according to Claim 1 or 4, characterised in that a deflecting surface (38) is formed on the adjusting element (37).
6. Agitating mill according to any one of Claims 1 to 5, characterised in that the inlet channel (20) for material to be ground is broader at the opening (39) of the return channel (34) - when seen in the conveying direction (40) of the material to be ground.
EP82101000A 1981-02-19 1982-02-11 Agitator mill Expired EP0058886B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19813106062 DE3106062A1 (en) 1981-02-19 1981-02-19 agitator mill
DE3106062 1981-02-19

Publications (3)

Publication Number Publication Date
EP0058886A2 EP0058886A2 (en) 1982-09-01
EP0058886A3 EP0058886A3 (en) 1984-05-30
EP0058886B1 true EP0058886B1 (en) 1986-05-07

Family

ID=6125219

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82101000A Expired EP0058886B1 (en) 1981-02-19 1982-02-11 Agitator mill

Country Status (5)

Country Link
US (1) US4496106A (en)
EP (1) EP0058886B1 (en)
JP (1) JPH0260380B2 (en)
DE (1) DE3106062A1 (en)
DK (1) DK154475C (en)

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3431142C2 (en) * 1984-08-24 1994-09-22 Fryma Masch Ag Mill
JPH027626Y2 (en) * 1985-01-16 1990-02-23
US4784336A (en) * 1987-03-10 1988-11-15 Lu Tsai Chuan Grinding machine for refining liquid material
DE3716587C1 (en) * 1987-05-18 1988-04-28 Draiswerke Gmbh agitator mill
US4850541A (en) * 1987-08-24 1989-07-25 Hagy John T Comminution apparatus
NZ226551A (en) * 1987-10-20 1990-03-27 Ici Australia Operations Fine grinding of ceramic particles in attrition mill
JPH0470050B2 (en) * 1987-12-28 1992-11-09 Inoue Mfg
US5004165A (en) * 1989-02-06 1991-04-02 Spectrum Sciences B.V. Dispersion apparatus
US5048762A (en) * 1989-02-06 1991-09-17 Spectrum Sciences B.V. Dispersion apparatus
JPH04166246A (en) * 1990-10-31 1992-06-12 Matsushita Electric Ind Co Ltd Medium agitating mill and grinding method
US5593097A (en) * 1994-06-10 1997-01-14 Eastman Kodak Company Micro media mill and method of its use
DE4432154A1 (en) * 1994-09-09 1996-03-14 Evv Vermoegensverwaltungs Gmbh Method and device for the continuous digestion of organic components of a flowable material to be treated
DE4432198A1 (en) * 1994-09-09 1996-03-14 Evv Vermoegensverwaltungs Gmbh Agitator mill
DE4432200C1 (en) * 1994-09-09 1996-02-29 Evv Vermoegensverwaltungs Gmbh Agitator mill
DE4432203A1 (en) 1994-09-09 1996-03-14 Evv Vermoegensverwaltungs Gmbh Agitator mill
DE19632757A1 (en) * 1996-08-14 1998-02-19 Draiswerke Gmbh Agitator mill
US6000646A (en) * 1998-03-16 1999-12-14 Ranne; Bethyl H. Double barrel media mill for grinding and dispersing particulate matter and pigment for paint, coatings, ink and other fluid pigment vehicles
US6300390B1 (en) 1998-06-09 2001-10-09 Kerr Corporation Dental restorative composite
US6121344A (en) * 1998-06-19 2000-09-19 Kerr Corporation Optimum particle sized hybrid composite
DE19839210B4 (en) 1998-08-28 2007-09-06 BüHLER GMBH agitating mill
US6158680A (en) * 1998-09-29 2000-12-12 Ranne; Bill H. Multi-barrel media mill and method of grinding
US6010085A (en) * 1999-03-17 2000-01-04 Kerr Corporation Agitator mill and method of use for low contamination grinding
JP2007125518A (en) * 2005-11-07 2007-05-24 Chuo Kakoki Kk Apparatus and method for processing liquid material
US8871739B2 (en) * 2008-11-05 2014-10-28 University Of Central Florida Research Foundation, Inc. Solid acid catalyzed hydrolysis of cellulosic materials
US8062428B2 (en) * 2007-11-06 2011-11-22 University Of Central Florida Research Foundation, Inc. Solid acid catalyzed hydrolysis of cellulosic materials
FR2925066B1 (en) * 2007-12-18 2014-12-19 Bertin Technologies Sa Device for milling a biological sample
EA030956B1 (en) * 2013-02-28 2018-10-31 Оутотек (Финлэнд) Ой Method of controlling a grinding mill process

Citations (1)

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DE2811899A1 (en) * 1978-03-18 1979-09-27 Fryma Masch Ag Gap ball mill

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US2595117A (en) * 1950-03-08 1952-04-29 Smidth & Co As F L Method and apparatus for grinding
DE1184188B (en) * 1961-06-21 1964-12-23 Draiswerke Gmbh An agitator mill for the production of solid dispersions
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DE1482391B1 (en) * 1964-06-20 1970-08-20 Draiswerke Gmbh agitating mill
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US4065060A (en) * 1976-10-06 1977-12-27 Aluminum Company Of America Metal flake production
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Also Published As

Publication number Publication date
DE3106062A1 (en) 1982-09-09
EP0058886A2 (en) 1982-09-01
DK154475C (en) 1989-05-22
DK70782A (en) 1982-08-20
JPH0260380B2 (en) 1990-12-17
JPS57147449A (en) 1982-09-11
EP0058886A3 (en) 1984-05-30
US4496106A (en) 1985-01-29
DK154475B (en) 1988-11-21

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