Vibrating mill

from Wikipedia, the free encyclopedia
Two-tube oscillating mill Palla U for continuous grinding, Humboldt type
Vibrating mill trainer (three-tube vibrating mill) Grinding tube diameter 1 × D = 500 mm (above) and 2 × D = 350 mm (below)
Rotary chamber vibratory mill, grinding tube diameter D = 650 mm with balls ø 25 mm
Eccentric vibratory mill ESM 656-2ks

Vibrating mills are crushing machines that, according to Klaus Schönert, are divided into crushers for coarse and mills for fine crushing. Among the latter, he counts the grinding media, roller, impact and cutting mills. The vibrating mills, along with the ball, rod, oxy-fuel, planetary, centrifugal and agitator mills, belong to the group of grinding media mills, which represent the most important class of mills in terms of size reduction machines. Karl Höffl gives a classification from a machine-technical and structural point of view , who divides the mills with shredding tools into directly and indirectly driven shredding tools. Vibratory mills therefore belong to the last-mentioned type of mill. The vibrating mill is a comminution unit in the area of ​​fine grinding, whose elastically mounted grinding container filled with grinding media is excited to vibrate perpendicular to the grinding container axis via a balancing mass system. The ground material is comminuted due to the relative speeds between the grinding container wall and the grinding body collective on the one hand and between the grinding bodies on the other hand. Also mechanochemical effects can be achieved due to the high energy density in the grinding chamber with the vibration mill. In this context, the work of Eberhard Gock should be mentioned in particular , who has worked successfully since the 1970s at the TU Berlin and from 1989 at the TU Clausthal in the field of chemical processing and environmental process engineering, and vibratory grinding as an essential process step in the processing of mineral Raw and residual materials - especially in special metallurgy - used.

From the vibratory trough mill to the vibratory tube mill .

The term "vibratory mill " appears for the first time in the patent from S. Kießkalt and W. Meyer from 1934. which is considered to be the birth certificate of this type of machine The further development leads from the discontinuously operating trough vibrating mill to the continuously operating trough vibrating mill and finally in the 1950s to the tube vibrating mill, whose concept is based on the leading engineers of Klöckner-Humboldt-Deutz AG Anlagenbau (1930-2001), Cologne, Carl Mittag (1878–1961) and Hellmuth Weinrich (1903–1989). The twin-tube vibratory mill was to be the most widespread type of vibratory mill in industry for a little over four decades.

In addition to the two-tube vibrating mill, one, three, four and six-tube vibrating mills were used. With the demands of the users of vibratory mills for high throughputs, narrow particle size distribution spectra and lower specific energy requirements, two paths have been taken in the technical development of vibratory tube mills since the 1970s: On the one hand, by increasing the diameter of the oscillating circuit. and on the other hand by modifying the grinding chamber geometry by means of rigid and movable components

Rotary chamber vibratory mill

Professor Eberhard Gock's group of researchers at the Technical University of Berlin took the second route in the 1980s with the rotary chamber vibrating mill. For this purpose, a vibrating mill test stand consisting of a three-tube vibrating mill with the appropriate measuring devices was set up (Fig. 2).

As part of the research project “Development of the rotary chamber vibratory mill for industrial use” (1986–1989) funded by the Federal Ministry of Research and Technology, measurements on the three-tube vibratory mill and industrial vibratory mills (Fig. 3) showed that the rotary chamber vibratory mill compared to the conventional Vibratory tube mill has the following advantages:

  • Reduction of the specific energy requirement by 20 to 40%
  • Throughput increase by 1.5 to 2 times
  • Production of milled products free from injection grains
  • Increase in the size reduction ratio by a factor of 5
  • No clogging if the grist is too large
  • Uniform wear of the grinding tube armoring
  • Use of grinding tubes with diameters D> 650 mm

On the basis of Kurrer's investigations into the internal kinematics and kinetics of conventional vibratory tube mills , it was also possible to describe the internal kinematics and kinetics of the rotary chamber vibratory mill, to set up a physically based power balance for both types of mill and to secure it using a machine-dynamic simulation model

Eccentric vibrating mill

With the models mentioned, the behavior of a newly designed single-tube vibratory mill was then simulated in 1989 and the knowledge about vibratory tube mills that had been gathered over eight years was published in 1992. The single-tube vibratory mill was then further developed into an eccentric vibratory mill (Fig. 4) as part of a joint project between the Institute for Processing and Landfill Technology at Clausthal University of Technology and Siebtechnik GmbH

In the case of the eccentric vibratory mill, the vibration is excited on one side by an unbalance drive directly flanged to the milling tube. In contrast to the homogeneous circular vibrations of conventional vibrating mills, the eccentric vibrating mill performs elliptical, circular and linear vibrations. This mill succeeds in reducing the specific energy requirement for vibrating mills by approx. 50% and increasing the throughput by a factor of 2. Since the end of the 1990s, the eccentric vibratory mill has found its way into the industrial processing of raw and residual materials and thus contributes to the rational use of energy in industry and to improving the quality of the ground products.

literature

  • Horac Edgar Rose, RME Sullivan: Vibration mills and vibration milling . London: Constable 1961.
  • Manfred Bayer, Andreas Davids, Karl Höffl, Michael Kießling: Investigations into comminution in vibratory mills . Freiberg research books A 750, 1988.
  • Karl-Eugen Kurrer, Jih-Jau Jeng, Eberhard Gock: Analysis of vibratory tube mills . Progress reports VDI series 3 (process engineering), No. 282. Düsseldorf: VDI-Verlag 1992, ISBN 3-18-148203-X .
  • Eberhard Gock, Karl-Eugen Kurrer: Eccentric vibratory mills - theory and practice , in: Powder Technology 105 (1999), pp. 302-310.

Web links

Commons : Vibrating Mills  - Collection of Images

Individual evidence

  1. ↑ K. Schönert: Shredding. In: Heinrich Schubert (Hrsg.): Handbuch der Verfahrenstechnik. Volume 1, WILEY-VCH, Weinheim 2003, pp. 299-382.
  2. ↑ K. Höffl: Crushing and classifying machines . VEB Verlag for basic industry, Leipzig 1985.
  3. ↑ H. Schubert: Preparation of solid mineral raw materials. 4th, heavily revised. Edition. Volume I, VEB Verlag for basic industry, Leipzig 1989.
  4. ↑ E. Gock: Influence of the dissolving behavior of sulphidic raw materials through solid body reactions during vibratory grinding. Habilitation. TU Berlin, 1977.
  5. ↑ S. Kießkalt, W. Meyer: Device for grinding dry substances, pastes u. Like. Using quartz sand or similar fine-grain grinding media. DRP No. 619662, 3.2.1934. Applicant: IG Farbenindustrie AG, Frankfurt am Main.
  6. ↑ a b c K.-E. Kurrer, J.-J. Jeng, E. Gock: Analysis of vibratory tube mills. (= Progress reports VDI, series 3: process engineering. No. 282). VDI-Verlag, Düsseldorf 1992, pp. 4-10.
  7. ↑ K. Grizina, H. Meiler, F. Rosenstock: The centrifugal mill - a new size reduction machine for ores and mineral raw materials. In: processing technology. Volume 22, H. 6, 1981, pp. 303-308.
  8. ↑ S. Bernotat, W. Shu-Lin: Results of vibratory mill investigations with large oscillating circle diameters. In: Chemie-Ing.-Techn. Volume 58, 1986, pp. 690-691, MS 1518/86.
  9. ↑ L. Rolf, E. Gock: Investigations for the optimization of vibratory grinding. In: Chemical plants + processes. Volume 11, H. 3, 1976, pp. 27-31.
  10. ↑ E. Gock, S. Michaelis, K. Täubert: Rotary chamber vibratory mill. GDR patent no.210616, July 12, 1984 and DBP no.3143756, July 3, 1986
  11. ↑ E. Gock, K.-E. Kurrer, S. Michaelis, W. Betgovargez, J.-J. Jeng, T. Becker, A. Althoff: Development of the rotary chamber oscillating mill for industrial use. Final report on research project 03E8523C3. Department of Raw Materials Technology at TU Berlin, Berlin 1989.
  12. ↑ K.-E. Kurrer: On the internal kinematics and kinetics of vibratory tube mills. (= Progress reports VDI, series 3: process engineering. No. 124). VDI-Verlag, Düsseldorf 1986.
  13. ↑ K.-E. Kurrer, E. Gock, S. Michaelis: Rotary Chamber Vibratory Mill. In: Freiberger Forschungshefte A. 778, 1988, pp. 76-89.
  14. ↑ K.-E. Kurrer, E. Gock: Determination of the power requirement of vibratory tube mills. In: Chemie-Ing.-Techn. Vol. 62, H. 6, 1990, pp. 510-511, MS 1871/90.
  15. ↑ J.-J. Jeng: Development of a machine dynamic simulation model for the optimal dimensioning of the tube and rotary chamber vibratory mills. Dissertation. Clausthal University of Technology 1991.
  16. ^ E. Gock, W. Beenken, H. Gruschka: Eccentric vibration mill. U.S. Patent No. 08 / 325,837 BC 1.7.1996, note Siebtechnik GmbH
  17. ↑ a b K.-E. Kurrer, E. Gock: Eccentric Vibratory Mills for Fine Comminution - a Kinematic Analysis. In: Cement - Lime - Gypsum International. Volume 50, No. 7, 1997, pp. 362-373.