Agitating – By movement of mixing chamber relative to stationary support
Patent
1991-05-13
1993-08-24
Coe, Philip R.
Agitating
By movement of mixing chamber relative to stationary support
366108, 366216, B01F 1100
Patent
active
052383040
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a mixing process according to the introductory clause of claim 1 and a mixing device for this purpose according to the introductory clause of claim 6.
Conventional mixers of solids are used in many engineering fields. Great importance is attached to such mixers of solids especially also in the field of working up or processing plastics and especially also in the field of pharmaceuticals as well as in the ceramics and paint industry. What is to be attempted with these mixers is to mix, as uniformly as possible, differing particles that differ, for example with respect to their size, shape and density, which means that the deviations in the density and composition in all the materials being mixed become minimal.
But this means recurring very great difficulties since separations can occur again and again, at least in partial areas, in a way not previously solved.
Because of this, the object of this invention is to provide a mixing process and an associated mixing device with which a very much faster and more uniform, thorough mixing can be obtained without dead zones and with comparatively simple means compared to the prior art.
The object is achieved with respect to the process according to the features indicated in claim 1 and, with respect to the device, according to the features indicated in claim 6.
A considerable technical advance is achieved by the invention in a surprising way. Precise studies have shown that, with conventional mixers of solids, the uniformly or regularly recurring mixing movement cannot produce an ideal, uniform mixture of the particle properties that are also partially very different, that are to be thoroughly mixed and that can differ from one another for example with respect to their size, shape or density, but that rather there is always a tendency toward separation. Such a regular mixing movement can produce, for example, a separation in a solids stream due to gravitational force; with high Froude numbers that can signify a centrifugal movement of the materials being mixed, an air separation, etc., can additionally occur.
Froude numbers involve, as is known, the ratio of the centrifugal force to the gravitational force of the materials being mixed.
The process according to the invention and the associated mixing device according to the invention are distinguished especially in that no uniform and recurrent movement sequences are used. Rather, attention is paid that, during mixing, the angle of the mixing container relative to the mixer axis changes irregularly during the rotation of the mixing container around its axis of rotation or mixer axis, i.e., is constantly set differently, so that a stochastic, random distribution is produced in this respect. In a further development, the speed, i.e., the speed of rotation and also the direction of rotation are constantly adjusted irregularly and nonuniformly so that stochastic, randomly distributed control is produced also in this respect. Thus the control in this respect comprises a random-check generator.
In addition to the constant stochastic, i.e., nonuniform change in the angle of inclination between the mixing container and its mixer axis, the speed and direction of rotation of the axis of rotation or of the mixer axis of the mixing container can also simultaneously be stochastically controlled and changed in a preferred embodiment. This double randomness causes the Froude number to change constantly and irregularly. Separations are prevented to a large extent so that a mixing quality is achieved that previously could not be achieved because of separation.
In the industrial embodiment of the mixing device according to the invention, suitably the material hoppers of the processing machines are used directly as mixing vessels so that separations that occur during decanting of the materials being mixed are eliminated. After mixing, the material hopper must be set, vibrationless, on the processing machine.
Grinding media can also be put into the mixing vessel of the stochastically operating mixing device. Thi
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Coe Philip R.
Till Terrence R.
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