CA2476562A1

CA2476562A1 - Agitator mill

Info

Publication number: CA2476562A1
Application number: CA 2476562
Authority: CA
Inventors: Stefan Gerl
Original assignee: Maschinenfabrik Gustav Eirich GmbH and Co KG
Current assignee: Maschinenfabrik Gustav Eirich GmbH and Co KG
Priority date: 2003-08-22
Filing date: 2004-08-05
Publication date: 2005-02-22
Anticipated expiration: 2024-08-05
Also published as: CA2476562C

Abstract

An agitator mill comprises a grinding receptacle and a rotarily drivable agitator arranged therein. A grinding-stock supply mouthes into the grind-ing chamber; a grinding-stock discharge leads out of the grinding chamber.
The grinding chamber is at least partially filled with auxiliary grinding bodies. The grinding-stock discharge is embodied as a device for grinding stock suction and auxiliary-grinding-body separation, comprising a plunge pipe which dips into a bed of grinding stock and auxiliary grinding bodies and from which, above the grinding receptacle, discharges a suction pipe with a grinding-stock suction device.

Claims

1. An agitator mill, comprising - a grinding receptacle (1), -- which encloses a grinding chamber (34) of a diameter D, -- which is closed downwards by a bottom (3), -- which has a top cover (16) and -- a vertical central longitudinal axis (2);
an agitator (11), -- which has an agitator axis (21) that is parallel to the central longi-tudinal axis (1), and -- which is equipped with agitator implements (13) inside the grind-ing chamber (34);
- an agitator drive (19) for rotary actuation of the agitator (11) about the agitator axis (21);
- a grinding-stock supply (24) which discharges into the grinding cham-ber (34);
- a partial filling of the grinding chamber (34) with auxiliary grinding bodies (37) of a diameter b which are movable in a bed of grinding stock and auxiliary grinding bodies in a direction of flow (29); and - a device (32) for grinding-stock suction and auxiliary-grinding-body separation, which leads out of the grinding chamber (34), -- which comprises a plunge pipe (33) of an inside diameter d which, by a bottom inlet (35), dips into the bed of grinding stock and aux-iliary grinding bodies and from which a suction pipe (39) dis-charges above the grinding receptacle (1), having a grinding-stock suction device (40);

wherein the plunge pipe (33), at its inlet (35), comprises a recess (42) which - related to the direction of flow (29) - is formed on the downstream side of the plunge pipe (33); and wherein an area (44) of the plunge pipe (33) which - related to the direc-tion of flow (29) - is located on the upstream side of the plunge pipe (33) in direct vicinity to the inlet (35) shields the recess (42) in the direction of flow (29).

2. An agitator mill according to claim 1, wherein the grinding receptacle (I) is rotarily drivable by a grinding-receptacle drive (6).

3. An agitator mill according to claim 1, wherein the plunge pipe (33) is eccentric of the central longitudinal axis (2).

4. An agitator mill according to claim 1, wherein the agitator (11) is eccen-trio of the central longitudinal axis (2).

5. An agitator mill according to claim 1, wherein the grinding-stock supply is a grinding-stock supply line (24) that projects into the grinding chamber (34).

6. An agitator mill according to claim 5, wherein the plunge pipe (33) is disposed between the agitator (11) and the grinding-stock supply line (24).

7. An agitator mill according to claim 5, wherein the grinding-stock supply line (24) is a flow deflector (36).

8. An agitator mill according to claim 1, wherein the inside diameter d of the plunge pipe (3) is great in relation to the diameter b of the biggest aux-iliary grinding bodies (37).

9. An agitator mill according to claim 8, wherein d >= 10b, and preferably d >= 20b, applies to the diameter d of the plunge pipe (33) in relation to the diameter b of the auxiliary grinding bodies (37).

10. An agitator mill according to claim 1, wherein 10d >= D >= 4d, and pref-erably 8d >= D >= Sd, applies to the diameter D of the grinding chamber (34) in relation to the diameter d of the plunge pipe (33).

11. An agitator mill according to claim 1, wherein the plunge pipe (33) is continuously cylindrical.

12. An agitator mill according to claim 1, wherein the plunge pipe (33), in the vicinity of the inlet (35), comprises an edge (43) which ascends in the direction of flow (29).

13. An agitator mill according to claim 1, wherein an upper area (45) of the recess (42) is located in the vicinity of a top level (36) of the bed of grind-ing stock and auxiliary grinding bodies of the grinding chamber (34).

14. An agitator mill according to claim 1, wherein the plunge pipe (33) is skewed as compared to the vertical.

15. An agitator mill according to claim 1, wherein the grinding-stock sup-ply is a grinding-stock supply line (24) that reaches as far as into the prox-unity of the bottom (3) of the grinding chamber (34).