Agitator mill
AssigneeBuhler AG
InventorsNorbert Stehr, Philipp Schmitt
Life of this patent
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Abstract
An agitator mill comprises an annular cylindrical exterior grinding chamber which is defined by an inner wall of a grinding receptacle and an outer wall of a rotor; and an interior grinding chamber which is defined by an inner wall of the rotor and an outer casing of an interior stator. The grinding chambers are interconnected by a deflection chamber. A grinding-stock supply area, which is upstream of the exterior grinding chamber, and a separator device, which is disposed approximately on the same side of the grinding receptacle, serving for grinding-stock discharge, are interconnected by auxiliary-grinding-body return conduits. These conduits are arranged in an independent auxiliary-grinding-body return module and are open towards a front of the module.
Claims12
An agitator mill for treating free-flowing grinding stock, comprising
- a grinding receptacle (2) which defines a substantially closed grinding chamber (8) by means of an inner wall (9);
- and
- an agitator (20) which is rotarily drivably disposed therein and which is cup-shaped in relation to a common central longitudinal axis (19), having an annular cylindrical rotor (39) which has a closed wall (40, 41);
- and
- an interior stator (22) which is disposed within the rotor (39) and fixedly joined to the grinding receptacle (2);
- wherein an annular cylindrical exterior grinding chamber (8a) is formed between the inner wall (9) of the grinding receptacle (2) and an outer wall (40) of the rotor (39);
- wherein an annular cylindrical interior grinding chamber (8b) is formed between an inner wall (41) of the rotor (39) and an outer casing (23) of the interior stator (22), the interior grinding chamber (8b) being arranged coaxially within the exterior grinding chamber (8a) and connected thereto via a deflection chamber (50);
- wherein the exterior grinding chamber (8a), the deflection chamber (50) and the interior grinding chamber (8b) constitute the grinding chamber (8) which is partially filled with auxiliary grinding bodies (38);
- wherein a grinding-stock supply area (57), which is disposed upstream of the exterior grinding chamber (8a) and opens into it in the direction of flow (60) of the grinding stock, and a separator device (32), which is disposed downstream of the interior grinding chamber (8b) in the direction of flow (60), are disposed approximately on the same side of the grinding receptacle (2) for the grinding stock to pass through;
- wherein auxiliary-grinding-body return conduits (54) are provided in the agitator (20) in an independent auxiliary-grinding-body return module (45), returning the auxiliary grinding bodies (38) from the vicinity of the separator device (32) into the grinding-stock supply area (57), the return conduits (54) connecting the end of the interior grinding chamber (8b) to the beginning of the exterior grinding chamber (8a);
- wherein the inner wall (9) of the grinding receptacle (2) and the outer wall (40) and the inner wall (41) of the rotor (39) are free of interruptions;
- wherein the auxiliary-grinding-body return conduits (54) are open towards a front (67) of the auxiliary-grinding-body return module (45);
- and
- wherein the auxiliary-grinding-body return conduits (54) have at least one of the following features:
- the auxiliary-grinding-body return conduits (54) are curved from the inlet (55) towards the outlet (56);
- the auxiliary-grinding-body return conduits (54) have a height (e) and the separator device (32) has a height (f), each in the direction of the central longitudinal axis (19), with e≦0.8 f applying to the height (e) in relation to the height (f).
Dependencies are inferred from the claim text.