Solid material comminution or disintegration – Processes – Miscellaneous
Patent
1995-01-26
1996-11-19
Rosenbaum, Mark
Solid material comminution or disintegration
Processes
Miscellaneous
241 37, 241207, 241 36, B02C 200, B02C 2500
Patent
active
055754287
DESCRIPTION:
BRIEF SUMMARY
This invention relates to grinding mills in which the material is ground between a cone and a bottomless truncated cone shaped bowl which surrounds the cone, the working surfaces of both the cone and the bowl being provided with an antiwear lining, and in which the bowl is mounted on a frame movable with respect to the supporting structure and equipped with means capable of imparting circular and approximately horizontal vibrations or oscillations to the bowl which makes the bowl move closer to and away from the cone, successively in all radial planes. The means used to make the bowl vibrate or oscillate can be unbalanced vibrators, electromagnetic vibrators, etc.
The principle of these machines has been known for a long time but, in practice, the machines have been scarcely used. In known machines of this type, the cone is rigidly fastened to its support, and, because of the circular movements of the bowl, the movements of the bowl away from and closer to the cone which result in crushing the material to be ground are accompanied by relative displacements parallel to the tangent planes which make the machine unstable and cause a rapid wearing out of the cone and bowl working surfaces. Moreover, the presently known machines do not lend themselves to an automated control enabling to obtain a given particle size.
The purpose of this invention is to make it possible to monitor the operation of the mill and to keep a closer eye on its condition, while extending the service life of the working surfaces.
The grinding mill forming the subject of this invention is characterized in that the cone is so mounted on its support as to be able to rotate freely around its axis and is equipped with means for measuring its speed of rotation around, which means are functionally connected with a system which adjusts the parameters--frequency and amplitude--of the bowl vibration generating means and with a system which adjusts the height of the cone with respect to the bowl.
The speed of rotation of the cone being known, one can determine, for a given setting of the mill (width of the annular gap in the ground material discharge plane), the thickness of the layer of material in the ground material discharge plane and, if necessary, modify it by adjusting the frequency and/or amplitude of the bowl vibration generating means and/or the height of the cone, so as to obtain a ground product with the required particle size; these means permit to control automatically the operation of the mill. Moreover, for given settings of the frequency and amplitude of the bowl vibration generating means and of the discharge-gap width, the evolution of the cone rotation speed permits to assess the wear of the cone and bowl working surfaces.
Another subject of this invention is a process for adjusting a mill of the above-defined type consisting in measuring the speed of rotation of the cone around its axis, in determining the minimum thickness of the layer of material in the ground material discharge plane from the cone rotation speed measurement and the measured width of the annular gap existing in the said plane between the cone and the bowl when the mill is at a standstill, and in setting the parameters of the bowl vibration generating means and/or the height of the cone with respect to the bowl to keep the minimum thickness of the layer of material equal to a set value.
The following description refers to the accompanying drawing which shows, as a non-limiting example, an embodiment of the invention. On this drawing:
FIG. 1 is a top view of a vibrating cone mill constructed according to the invention ;and
FIG. 2 is a vertical section view, according to A--A, of the mill shown in FIG. 1;
In the mill of FIGS. 1 and 2, cone 10 is mounted, by means of bearings 14, on a shaft end 12 which is supported by a structure 16; this mounting allows the cone to rotate freely around its axis. Structure 16 rests on an elastic system 30 which reduces the transmission of the efforts and vibrations to the ground. With a view to reducing the amplitude of frame vi
REFERENCES:
patent: 3944146 (1976-03-01), Stockmann et al.
patent: 4272030 (1981-06-01), Afansiev et al.
patent: 4964580 (1990-10-01), Akesaka
Cordonnier Alain
Evrard Renaud
FCB
Rosenbaum Mark
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