Agitator mill

Details Agitator mill Agitator mill

1989-11-06

1991-11-05

Rosenbaum, Mark

Solid material comminution or disintegration

Apparatus

Loose grinding body comminutor

241172, B02C 1716

Patent

active

050625772

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The invention relates to an agitator mill for the treatment of flowable grinding stock with a grinding receptacle defining a mostly closed grinding chamber and with an agitator element, capable of being rotatingly driven and being cup-shaped in relation to a common center-longitudinal axis, disposed therein, inside of which is disposed an interior stator fixedly connected with the grinding receptacle, an exterior grinding chamber being formed between the grinding receptacle and an outer wall of the agitator element and an interior grinding chamber being formed between an interior wall of the agitator element and the interior stator, which is disposed coaxially within the exterior grinding chamber and is connected with it via a deflection chamber, the exterior grinding chamber, the deflection chamber and the interior grinding chamber forming the grinding chamber partially filled with auxiliary grinding bodies, a grinding stock supply chamber, disposed ahead of the grinding chamber in relation to the flow direction of the grinding stock, and a separator device for the discharge of the grinding stock, disposed after the grinding chamber in relation to the flow direction of the grinding stock, are disposed on the same side of the grinding receptacle, and with bypasses for the return of the auxiliary grinding stock from the area of the separator device to the area of the grinding stock supply chamber being provided in the agitator element.


STATE OF THE ART

In such an agitator mill, known from German Patent No. 28 11 899, the exterior grinding chamber on the one side and the interior grinding chamber each taper in the form of a truncated cone, i.e. the diameter of the grinding chamber is conical on each side of the center-longitudinal axis. The same is true for the diameter of the agitator element. The grinding stock flows through the agitator mill from the inside out, i.e. it flows into the interior grinding chamber at the narrow diameter, flows through the radially widening interior grinding chamber, the deflection chamber and then the radially widening exterior grinding chamber. From there it flows radially inward through a chamber, limited on one side by the agitator element, to a separator device through which the grinding stock is discharged. The entrance of a bypass is located behind this separator device, the entrance of which is disposed radially within the separator device, i.e. is disposed behind it. From there the auxiliary grinding bodies flow into the beginning area of the interior grinding chamber via bypasses in the rotor.
An agitator mill is known from European Patent No. 0 146 852 having a grinding chamber with a cylindrical inner wall and a cylindrical rotor, an annular cylindrical grinding chamber being formed between the rotor and the inner wall of the grinding receptacle. The agitator element has a hollow chamber on its free end into which a separator device extends. In this area the agitator element is provided with recesses around the separator device which permit the auxiliary grinding bodies, which freely flow into the hollow chamber together with the grinding stock, to exit radially.
An agitator mill is known from German Published, Nonexamined Application No. DE-OS 31 06 062 (corresponding to U.S. Pat. No. 4,496,106), in which an annular cylindrical grinding chamber is formed between a cylindrical inner wall of a grinding receptacle and a cylindrical rotor. Grinding stock is supplied to the grinding chamber from below. It is removed at the top through a separator device. A bypass is formed ahead of the separator device in the grinding receptacle into which the auxiliary grinding bodies are catapulted before reaching the separator device. They are again returned to the grinding stock prior to entry into the grinding chamber.


DESCRIPTION OF THE INVENTION

It is an object of the invention to improve an agitator mill of the species in such a way that it is possible to obtain a return of the auxiliary grinding bodies which prevents to the greatest extent possible wear

REFERENCES:
patent: 4629133 (1986-12-01), Buhler
patent: 4742966 (1988-05-01), Szkaradek et al.

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