Agitator mill

Details Agitator mill Agitator mill

1985-07-11

1986-11-04

Rosenbaum, Mark

Solid material comminution or disintegration

Apparatus

With separation or classification of material

241172, B02C 1716

Patent

active

046206736

DESCRIPTION:

BRIEF SUMMARY
The invention relates to an agitator mill comprising partly with grinding media and material to be ground and has an inlet for material to be ground and an outlet for crushed material, of the grinding chamber to the outlet, yet retaining grinding media.
In a known agitator mill of this kind (DE-PS No. 2 037 358) designed as an upright agitator mill, including a vertical agitator shaft the separating means consists of a plurality of screen cartridges disposed in the upper region of the grinding chamber. In one embodiment (FIGS. 1 and 2) the grinding chamber is connected by three parallel horizontal tubes to the outlet for pulverized material flange-mounted laterally to the milling body. Through each of these tubes a screen cartridge is introduced into the grinding chamber such that one of the screen cartridges extends radially to the agitator shaft, terminating just short of the same, while two other ones which are longer are disposed at either side of the agitator shaft. In another embodiment (FIG. 3) screen cartridges are arranged offset with respect to one another in parallel with the agitator shaft and communicate with an outlet for pulverized material located above the grinding chamber. In both cases the flow of grinding media and material to be ground circulates well all around the screen cartridges so that they do not become clogged. Yet in operation the screen cartridges are constantly hit by grinding media activated directly by the agitator shaft and thus impacting at great energy of motion on the screen cartridges which, therefore, are subject to quick wear.
It is, therefore, the object of the invention to design an agitator mill such that the separating means is largely withdrawn from the grinding medium activated directly by the agitator shaft and yet does not tend to become clogged.
This object is met, in accordance with the invention, in an agitator mill of the kind specified initially in that the inner shaft end, distributed around the cavity and spaced from the inner shaft end and permit grinding media which entered the cavity through the inner shaft end to flow back into the grinding chamber, cavity.
The invention has the advantage of the separating means, no matter what its particular structure may be, being arranged protectedly within the open-ended cavity formed in the end portion of the agitator shaft, whereby grinding medium activated directly by the agitator shaft hardly has a chance to collide with the separating means. And yet the risk of obstruction of the separating means is avoided by the rotation of the agitator shaft.
Preferably at least one conveying member is formed at the agitator shaft for enhancing the axial flow of the grinding medium and material to be ground from the inner shaft end through the cavity to the recesses. The conveying member may be constituted by the wall itself of the cavity, for instance by conical enlargement of the cavity away from the inner end of the shaft.
The separating means preferably is disposed at least approximately coaxially with the agitator shaft. It may also be convenient to dispose the separating means parallel or at an angle with respect to the axis of the agitator shaft, depending on the position of the agitator shaft in space and on the type and properties of the material to be ground.
The separating means may be arranged on a tube which extends through part of the grinding chamber from the inner shaft end into the cavity. This embodiment of the invention permits particularly easy assembly and disassembly of the separating means together with the tube.
Conveniently the tube is guided so as to be pulled out to the exterior in a tubular socket which extends from an end face of the milling body into the cavity.
It is likewise advantageous if the tube is guided for being pulled out to the exterior in a sleeve which is disposed at an end wall of the milling body for adjustment between a normal operating position at which it is located substantially outside of the grinding chamber and a position for exchange of the separating means, at which

REFERENCES:
patent: 3780957 (1973-12-01), Wilheim
patent: 4108385 (1978-08-01), Funk

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