Agitator Mill

Abstract

An agitator mill including a grinding chamber containing grinding bodies and an agitator shaft, which revolves therein around a horizontal axis and which supports several grinding disks, which are connected thereto and which are spaced apart from one another in the direction of the horizontal axis and which move the grinding bodies, wherein grinding disks preferably in each case have slits or apertures, wherein adjacent grinding disks are arranged on the agitator shaft so that the ratio of the grinding chamber length to the radial grinding chamber height is greater than or equal to 2:3, and that the radial distance between the outer jacket surface of the grinding disks and the inner wall of the grinding container limiting the grinding chamber is more than 20% of the radial grinding chamber height.

Claims

1. An agitator mill comprising a grinding chamber containing grinding bodies and an agitator shaft, which revolves around therein a horizontal axis and which supports several grinding disks, which are connected thereto and which are spaced apart from one another in the direction of the horizontal axis and which move the grinding bodies, wherein grinding disks preferably in each case have slits or apertures, wherein adjacent grinding disks are arranged on the agitator shaft so that the ratio of the grinding chamber length to the radial grinding chamber height is greater than or equal to 2:3, and that the radial distance between the outer jacket surface of the grinding disks and the inner wall of the grinding container limiting the grinding chamber is more than 20% of the radial grinding chamber height.

2. The agitator mill according to claim 1, wherein the grinding disks have slits and/or apertures or consist of several blades, which are arranged one behind the other in the circumferential direction in a rotational alignment and which are positioned spaced apart from one another in the circumferential direction.

3. The agitator mill according to claim 1, wherein on its end facing the separating system, the agitator shaft forms a rotor disk, which essentially limits the actual grinding chamber from the separating system, and which is equipped with rotor bars, which protrude from it and which, viewed in the circumferential direction, are spaced apart from one another and form slits between one another.

4. The agitator mill according to claim 3, wherein the rotor disk is slit all the way into the region radially below the rotor bars.

5. The agitator mill according to claim 3, wherein the flow-through surface—preferably viewed in the axial direction—through the rotor disk is greater in the radius region between the rotor bars than in the rotor interior, which is enclosed by the rotor bars in the circumferential direction.

6. The agitator mill according to claim 2, wherein on its end facing the separating system, the agitator shaft forms a rotor disk, which essentially limits the actual grinding chamber from the separating system, and which is equipped with rotor bars, which protrude from it and which, viewed in the circumferential direction, are spaced apart from one another and form slits between one another.

7. The agitator mill according to claim 4, wherein the flow-through surface—preferably viewed in the axial direction—through the rotor disk is greater in the radius region between the rotor bars than in the rotor interior, which is enclosed by the rotor bars in the circumferential direction.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG. 1 schematically shows the setup and the connection of a general agitator mill.

[0023] FIG. 2 shows a first alternative of an agitator mill with depicted grinding chamber height a, grinding chamber length b and radial distance c.

[0024] FIG. 3 shows a second alternative of the agitator mill according to the invention with depicted grinding chamber height a, grinding chamber length b, and radial distance c.

[0025] FIG. 4 schematically shows an option for the design of the rotor disk, which limits the grinding chamber 7 with its individual grinding chambers 14 from the separating system 4.

DETAILED DESCRIPTION

[0026] FIG. 2 shows a first alternative of the agitator mill 1 comprising agitator shaft bushings 12, which are only illustrated here by means of “dummies”, which are not significant, and which are thus suggested in a dotted manner. In addition, the grinding container 2, the agitator shaft 3, the separating system 4, the inlet 5, the outlet 6, the grinding disks 8 and the horizontal axis 13 of the agitator shaft can be seen. The grinding chamber 7 characterizes the complete space, which can be occupied by the material to be ground, in the interior of the grinding container. However, the grinding chamber 14 is thereby a subcategory of the grinding chamber and is depicted by means of dashed lines. The grinding chamber height a, the grinding chamber length b, and the radial distance c are furthermore depicted.

[0027] It can be seen well by means of FIG. 2 that, on its end facing the separating system 4, the agitator shaft forms a rotor disk 15, which limits the actual grinding chamber from the separating system. For this purpose, the rotor disk is equipped with rotor bars 16, which protrude from it—often in a finger-like manner—and which, viewed in the circumferential direction, are spaced apart from one another and form slits between one another. They engage over the separating system 4 and, as a whole, form quasi a cavity, which receives the separating system 4. The rotor disk 15 can advantageously be slit all the way into a slit region 17 radially below the rotor bars, then thus optionally also has an aperture, which can be flown through axially and which reaches all the way into the actual shaft, radially below the rotor bars 16. This design of the rotor disk comprising the rotor bars 16 is illustrated schematically by means of FIG. 2. This design provides a noticeable further contribution to increasing the grinding body mobility.

[0028] With all this, it can be advantageous when the rotor disk 15 has a smaller diameter than the grinding disks 8 or than the imaginary rotational body of the individual bodies, such as blades or the like, which form the grinding disks.

[0029] FIG. 3 shows a second alternative of the agitator mill 1. Agitator shaft bushings 12 of square shape are used.

[0030] The shape of the grinding disk can additionally be recognized on the left in the sectional view. The other setup of the agitator mill corresponds to the setup of the first alternative.

[0031] The grinding chamber height a, the grinding chamber length b and the radial distance c are additionally also depicted here.

[0032] It can be recognized quite well that each grinding disk consists of several blades, which are arranged one behind the other in the circumferential direction in a rotational alignment and which are separated from one another in the circumferential direction by means of continuous slits. A dimensional matching with the grinding bodies takes place here because the slit size, the size of the grinding bodies and the radial gap distance between the grinding disks and the grinding container inner wall or the grinding container inner circumferential surface, respectively, has to be selected so that the grinding bodies remain mobile in spite of frictional and self-locking forces, and do not block the blades.