DE2650440A1 - REFRIGERATED MILL WITH A HORIZONTAL GRINDING AXIS FOR CRUSHING SOLID MATERIALS THAT FLOAT IN PRE-DISPERSED FORM IN HIGHLY AND MEDIUM VISCOSITY LIQUIDS - Google Patents

Description

The invention relates to the design of a cooled mill with a horizontal grinding axis for the comminution of solids, which float in pre-dispersed form in high and medium viscosity liquids.

Such a mill consists essentially of a horizontal one Grinding chamber, within which grinding media, e.g. balls, made of suitable materials with the help of interchangeable with spacing mutually arranged on this grinding axis

7Ö9 & 84/0612

Bank details ι Bayer. Verainsbank Munich, account £ 20 404 · Postal checking account ι Munich 270 44-802

ben taken within the grinding chamber and in motion in this way be moved.

The grinding chamber is double-walled for cooling purposes and has an inlet and an outlet for the product to be treated or treated and optionally also the grinding media on.

The cooling of the grinding chamber and possibly also the grinding axis is necessary because of the friction of the Interengaging grinding media, agitator disks and the product to be treated arise at temperatures that are for the product to be treated can become unacceptably high.

The grinding chamber is provided with a filter device through which the grinding media are retained, the treated However, the product can pass through.

If necessary, there is a circulation pump for the respective cooling medium in use, which can optionally be a liquid or a gas depending on the case. On the grinding axis the agitator disks are held interchangeably by means of suitable bushings at a predetermined distance from one another. The grinding axis is set in rotation by an associated drive, which preferably consists of a motor and a associated translation, preferably a transmission, optionally using a speed controller. A pump can be provided to circulate the product to be treated using a volume regulator if necessary.

The present invention now relates to the problem of forming the aforementioned filter means the manner in which I j, which retains the grinding media, however, can pass the treated finely overall j-ground product. · '

701144/0612

2650ΑΛ0

According to the invention, such a filter device is now so in a cooled mill of the type explained above designed to have a separating screen which is provided with passages of such size that the grinding media, e.g. Grinding balls, which, however, keep the finely ground product along and around the grinding axis of the mill can leak to the outside.

According to the invention, this separating screen advantageously consists of one Sieve cylinder coaxial to the grinding axis. In a further advantageous embodiment of the invention, this is as a coaxial screen cylinder formed separating sieve coaxially attached to a cylindrical outlet chamber, the openings for the finely ground product having.

According to the invention, both this cylindrical separating sieve and the associated outlet chamber can be separated from the one in the grinding chamber the mill rotating grinding axis be held so that these two parts rotate together with the grinding axis.

To facilitate understanding of the invention, the same is illustrated using schematic drawings for an exemplary embodiment explained below.

In the drawings show:

1 shows a side view of the entire mill on a reduced scale;

FIG. 2 shows an axial longitudinal section through the grinding chamber with the grinding axis and its drive, enlarged compared to FIG. 1 Scale;

3 shows, on a further enlarged scale, a cross section through the part of the grinding axis which the separating sieve and receives the associated cylindrical exit chamber.

709884/0612

2650A40

It can be seen from the drawings that the grinding channel 2 of the mill is attached to the housing 1 of the mill and accommodates the horizontally arranged grinding axis 13 and the exchangeable agitator disks 14 arranged on the latter. The grinding chamber is double-walled for cooling purposes. The inner wall 3 of the grinding chamber 2, which represents the actual grinding chamber body, is arranged in a floating manner within the grinding chamber 2 in such a way that it is only attached to the housing 1 of the mill at one end by means of an outwardly directed annular flange k. The other end of this inner wall 3 is axially freely movable so that expansion stresses occurring due to different heating can be absorbed by the inner wall 3 without the latter being deformed or being damaged.

Inside the Mahlkanmer 2 of the mill, a generally designated 6 separating screen is installed, which comprises a coaxial to the grinding axis 13 cylinder 7 which is provided with annular slots 8 of such dimensions that the inside of the grinding chamber 2 of the agitator disks Ik in circulation or in Movement displaced grinding media, for example grinding balls, are retained, on the other hand, the finely ground product by the mill can pass in the direction of the arrows P to the outside. The finely ground product passes through an annular slot 9 which is formed by the outer circumference of the grinding axis and the screen cylinder 7 on the one hand and an associated cylindrical outlet chamber 10 on the other. The assembly of the separating screen, generally designated β , thus consists of the screen cylinder 7 and the cylindrical outlet chamber 10, which are coaxially arranged and held on the grinding axis 13 so that they can rotate together with the latter. The screen cylinder 7 is held on the one hand by a support part 12 and on the other hand by the cylindrical outlet chamber 10. The outlet chamber 10 itself is supported on the grinding axis 13 by a further bush-like part 12 '.

709884/0612

During the rotation of the grinding axis 13 and the one entrained by the same Sieve cylinder 7 are the grinding bodies contained in the grinding chamber 2 alternately by the centrifugal force thrown outside, but without any signs of wear on the screen cylinder 7. Since the screen cylinder 7 is always cleans and keeps it open by itself, no special regulatory measures are required in this regard.

The grinding axis is equipped with a cooling device, which dissipates the heat generated by friction on the same, which arises, for example, on the seal 15, on the roller bearings 16, etc. The corresponding cooling system consists of one rotating compact seal with double passage running on friction seals, the task of which is to to introduce and remove the cooling medium through a pipe which is provided with a Teflon guide at its end is. The mentioned seal 15 is cooled in a circuit which is fed by a diaphragm pump, the is operated in pulses and built up on the grinding axis 13 is, a container and the supply lines of the cooling medium to the seal 15 and its drain lines in the Container. When the mill is switched on, the cooling of this seal 15 is automatically activated, so that the same never occurs can run dry, thereby avoiding the lack Lubrication and the sealing lip can be damaged as a result of excessive temperature.

PATENT CLAIMS:

701184/0612

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Claims (4)

PATENT CLAIMS Cooled mill with horizontal grinding axis for the comminution of solids, which are pre-dispersed in high- and medium-viscosity liquids float, in which grinding media with the help of the horizontal grinding chamber of exchangeable and spaced apart agitator disks on the rotating grinding axis taken along and set in motion, the grinding chamber being double-walled for receiving the cooling medium and with inlets and outlets for that to be treated Product and optionally the grinding media is provided, characterized by a separating sieve (6, 7), which with passages (8) of such dimensions is provided that the grinding media, e.g. grinding balls, are retained while the finely ground product is longitudinally and can exit to the outside around the grinding axis (13). 2. Cooled mill according to claim 1, characterized in that that the separating sieve (6, 7) comprises a sieve cylinder (7) which is coaxial with the grinding axis (13). 3. Cooled mill according to claim 1 and 2, characterized in that said screen cylinder (7) coaxially to a cylindrical Austrittskamiaer (10) is grown, which with Breakthroughs (11) is provided for the finely ground product. 4. Cooled mill according to claims 1 to 3, characterized in that that the sieve cylinder (7) and the outlet 709884 / 0612- -r- ¹ * chamber (10) are held on the grinding axis (13) rotating in the grinding chamber (2) so that the sieve cylinder (7) as well as the outlet chamber (10) rotate together with the grinding axis (13). PATENTA N WA LTE OR.-ING. H. FINCKE, DPPL.-ING. H. BOHR QIPL.-ING. S. STAEGER. DR. Rar. nat. R. KNEISSI 709884 / 06T2