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

Definitions

• the invention relates to a stirred mill according to the preamble of claim 1.
• Such a stirring mill is known from EP 0 751 830 Bl.
• the distance between the last cage-carrying stirring disk and the adjacent stirring disk is significantly smaller than the distance of the other stirring disks from each other.
• the distance is in each case so large that set so-called Zopfströmonne, that is, adjacent to the stirring discs, the material to be ground flows with the Mahlos emotionsn due to the applied by the stirring discs tangential pulses to the outside.
• Zopfströmonne the distance between adjacent stirring discs must be sufficiently large.
• This distance is also defined by a so-called separation angle, which is enclosed by two lines.
• a line extends between a radially inner end of a stirring disc on the stirrer shaft. The other line is parallel to the axis of the stirrer shaft.
• the angle of separation should be between 30 ° and 60 °. So that a particularly good separation of Mahlos emotions from the material to be ground, including not yet sufficiently comminuted Mahlgutp
• the distance between the last stirrer disc and the adjacent stirrer disc is significantly reduced, so there takes place while avoiding the formation of a Zopf- flow pre-classification before the separator.
• the invention has for its object to design a stirred mill of the generic type so that without increasing the Baulän- ge a more intense grinding and dispersing process at the same time better separation of Mahlosterrorism and coarse not sufficiently ground Mahlgutp perfume done.
• the development according to claim 9 causes the material to be ground with the normal concentration of Mahlosêtn fully funded by the passages in the gap space between the last stirring disc and the intermediate wall.
• FIG. 1 is an agitator mill in a schematic representation in a side view in a partially broken view
• Fig. 2 shows a first embodiment of the outlet region of
• Fig. 3 shows a second embodiment of the outlet region of
• 4 is a stirring disc in a perspective view
• 5 is a final stirring disc with cage in perspective view
• FIG. 6 shows a further embodiment of a stirring disk
• Fig. 7 shows a further embodiment of a last stirring disc with cage in perspective view
• FIG. 8 shows a partial section through the last stirring disk according to the section line VIII-VIII in FIG. 7.
• the agitator mill shown in the drawing has a machine stand 1, to which a grinding container 2 is releasably attached.
• a drive motor 3 is arranged, which drives a stirrer shaft 5 of a stirrer 6 via a belt drive 4.
• the agitator shaft 5 is rotatably supported in the machine stand 1 in bearings 7.
• the agitator shaft 5 is not stored, d. H. she is in the machine stand
• the grinding container 2 is closed relative to the machine stand 1 by means of a lid 8, which is penetrated by the stirring shaft 5, wherein a seal by means of a shaft seal 9 is effected.
• a grinding material feed 11 opens into the grinding chamber 10 enclosed by the grinding container 2. From the regrind feeder
• I 1 opposite end of the grinding container 2 opens from the grinding chamber 10 final floor 12 a regrind discharge 13 from.
• the stirring discs 14 On the agitator shaft 5 are - as part of the agitator 6 - mounted as agitating 14 stirring tools, the stirring discs 14 have openings 15 in its outer peripheral region. The distances a adjacent stirring discs 14 in the direction of the axis 16 of the stirring shaft 5 are the same. Only the distance of the lid 8 immediately adjacent stirrer disc 14 from the lid 8 is smaller than the distance a.
• the last stirring disk 17 of the agitator 6 adjacent to the bottom 12 is fastened to the agitator shaft 5 by means of a fastening screw 18.
• the axial distance a 'of this stirring disc 17 from the adjacent penultimate stirring disc 14 of the agitator 6 is identical to the aforementioned respective axial distances a adjacent stirring discs 14.
• the diameter b of all stirring discs 14 and the diameter b' of the stirring disc 17 are identical.
• a cylindrical cage 19 is formed, which may be formed integrally with the last stirring disc 17. He has distributed over its circumference numerous openings 20.
• passages 22 formed in the last stirring disk 17 open adjacent to the stirring shaft 5.
• a sieve device 23 is arranged concentrically to the axis 16 at the bottom 12. It is mounted on the floor 12, in such a way that the sieve means 23 can be pulled out after loosening from the bottom 12 to the outside. So it is non-rotatably connected to the grinding container 2. From the inner space 24 of the strainer 23 opens the Mahlgut- discharge 13.
• the sieve means 23 may be known by at its cylindrical periphery in known Way be formed at a small distance from each other arranged annular discs.
• the inside of the stirrer disk 17, the cage 19 and the screen device 23 thus form a separating device 25.
• the screen device 23 has a closed end plate 26 adjacent to the stirrer disk 17. The inner space 24 of the sieve device 23 is thus connected to the separation chamber 21 only via the sieve device 23.
• a closed intermediate wall 27 is mounted between the stirring disc 17 and the end plate 26, which rotates with the agitator 6 and which defines a gap space 28. While in the exemplary embodiment according to FIG. 2, this intermediate wall 27 is fastened to the agitator shaft 5 with the fastening screw 18, in the exemplary embodiment according to FIG. 3 the intermediate wall 27 'is direct by means of wing-like spacer pieces 29 distributed over the circumference attached to the stirrer disk 17.
• the intermediate walls 27 and 27 'each extend radially at least over the end plate 26; it is therefore: c> d, where c is the diameter of the intermediate wall 27 or 27 'and d is the diameter of the end plate 26.
• c> d wherein the corresponding intermediate wall 27 'extends close to the cage 19.
• the embodiment according to FIG. 3 differs from that according to FIG. 2 by the fact that in the stirrer disk 17 '- on the side facing the adjacent stirrer disk 14 - recesses 30 of the same shape are formed with the openings 15 in the stirrer disks 14, which are the same Cross section as the openings 15 have, but do not lead into the separation chamber 21.
• the openings 15 in the stirring discs 14 can - as Fig. 4 can be removed - have a circular cross-section.
• the depressions 30 in the stirring disk 17 'according to FIG. 5 are of circular design.
• the openings 15 'in the stirrer disks 14 may have approximately the cross section of outwardly widening trapezoids. The same applies to the recesses 30 'in the corresponding stirring disc 17', as shown in FIG. 7 can be removed.
• the grinding chamber 10 is filled to a considerable extent with auxiliary grinding bodies 31.
• flowable ground material is pumped continuously through the grinding chamber 10 by means of a pump, not shown.
• the agitator 6 is driven in rotation by the drive motor 3.
• the ground material flows through the grinding chamber 10 in the direction of the Mahlgut- outlet formed by the Mahlgut- discharge 13.
• this passage it is subjected to strong shearing stresses by the auxiliary grinding bodies 31 and as a result of this comminution particles are comminuted and, in addition, the material to be ground is homogenized. This process is carried out in such a way that in each case between adjacent stirrer disks 14 and 14 and 17, shown in FIGS. 1 and 2 plait flows 32 set.
• the ground regrind is - as far as it is not deflected by the cage 19 dert is - deflected in the annular gap 27 a between the outer periphery 27 b of the intermediate wall 27 and the cage 16 in an axial flow direction and discharged through the strainer 23.
• the separation of the Mahltos stresses 31 and optionally of large Mahlgutpumblen thus takes place only within the separation device 25.
• a so-called separation angle ⁇ or ⁇ is used.
• the separation angle ⁇ or ß is formed between two lines 33 and 34, respectively.
• the line 33 extends from the inner end 35 of a stirring disc 14 on the stirring shaft 5 to the outer edge 36 of an adjacent stirring disc 14.
• the other line 34 is a line parallel to the axis 16.
• the separation angle ⁇ is the one between the last stirring disk 17 or 17 'and the next adjacent stirring disk 14.
• the separation angle 30 ° ⁇ ⁇ 60 ° or 30 ° ⁇ ⁇ 60 °.
• this also means that the separation angle ⁇ between the last stirrer disk 17 or 17 'and the next adjacent stirrer disk 14 is such that the mentioned plait flows 32 set, even if the distances a and a' are not identical should.
• the invention is of course also applicable to stirred mills with a vertical axis.
• the passages 22 in the stirrer discs 17, 17 ' as shown only in Fig. 8, be designed to be actively conveying. Their walls 37 in this case do not run parallel to the axis 16, but are counter to the direction of rotation 38 and in the flow direction 39 - thus in the direction of the intermediate wall 27 out - trailing by an angle ⁇ against a parallel to the axis 16 employed.
• the ground material and the auxiliary grinding bodies 31 are drawn particularly intensively into the passages 22 and are forced into the gap space 28 by them.
• the sum of the above-mentioned partial flows actually corresponds approximately to the total volume flow of millbase volume flow fed through the grinding stock feed 11 and through the grinding stock discharge 13, the normal concentration in this range being due to the pigtail flow 32 present is present in Mahlosêtn 31 in the millbase, which are also conveyed through through the passages 22.

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• Engineering & Computer Science (AREA)
• Food Science & Technology (AREA)
• Crushing And Grinding (AREA)
• Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
• Mixers Of The Rotary Stirring Type (AREA)

Applications Claiming Priority (1)

Publications (2)

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Cited By (1)

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• 2007
  • 2007-08-17 DE DE502007006343T patent/DE502007006343D1/de active Active
  • 2007-08-17 AT AT07801726T patent/ATE495819T1/de active
  • 2007-08-17 WO PCT/EP2007/007279 patent/WO2009024159A1/fr not_active Ceased
  • 2007-08-17 CN CN2007801002746A patent/CN101801532B/zh not_active Expired - Fee Related
  • 2007-08-17 EP EP07801726A patent/EP2178643B1/fr not_active Not-in-force
  • 2007-08-17 ES ES07801726T patent/ES2356855T3/es active Active

Non-Patent Citations (1)

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