DE1106585B - Centrifugal mill - Google Patents

Description

Centrifugal mill addition to Patent 1,044,567 the main patent 1,044,567 is for a centrifugal grinder, wherein the circular about a vertical axis mill rotor receives the ground material fed axially and it ejects from the inside to the outside through channels therethrough against a fixed, closed impact casing whose height the height of the outlets of the mill rotor exceeds significantly, it has been proposed to dispose the impact jacket parallel to the mill axis.

For the comminution of substances whose end product does not contain iron may contain, the use of impact jackets made of steel is prohibited. It is therefore proposed according to the invention to provide the impact jacket with a lining Lining sintered ceramics.

The use of ceramic materials in the area of the crushing zone von Mühlen is known per se. The known mills are, however around jet mills intended for the comminution of soft substances, in which the comminution takes place by abrasion. The use of ceramic impact jacket linings in centrifugal mills was previously considered uneconomical because of the brittleness of the ceramic Materials the linings should have been made very strong to withstand the occurring To be able to withstand stresses, so that with such a design outside the main impact zone, d. H. in the zone that is only exposed to grit, a very large amount of the expensive material would remain unused for the lining.

The use of ceramic baffle linings in mills with The baffle ring, which can be displaced parallel to the axis, allows significantly better utilization the built-in lining and thus makes the operation of such mills economical.

Further improvements are achieved according to the invention by that the impact jacket lining is provided with strong rounded corners on its back is. This measure makes it possible either to make the feed weaker or else to subject strong linings to wear more than before. While at in cross section rectangular chuck that occurs when the ground material hits the chuck Forces are only distributed over an area that corresponds to the back of the lining, With the proposed shape, these surfaces are due to the strong rounded corners increased considerably and consequently reduced the load.

In the drawing, the invention is in more detail in one Embodiment shown. The drawing shows a vertical partial section through the mill.

The mill consists of the shaft 1 of an electric motor or a gear rotating mill rotor 2, which the ground material through the pipe 3 through receives fed and it through the grist guide channels 4 against the baffle 5 ejects. Mill rotor 2 and impact ring 5 are enclosed by the mill housing 6 and shut off from the outside air. A stream of air or gas that crushed it Absorbs well and discharges it to the point of use, is between mill runner and Baffle ring and passed through the housing.

The impact ring 5 is composed of a plurality of segments 16 ' Lining lining 16, which consists of sintered ceramic and cemented into the ring is.

The impact ring rests on a support ring 7, which in turn is threaded is carried by a feed ring 8. The lining ring 8 is secured by means of screws 15 or the like held in the housing 6. The support ring 7 has teeth on its circumference 9 or the like. Which mesh with a gear 10. The gear 10 is firmly seated a spindle 11 which is rotatably mounted in bearings 12 of the mill housing. the The spindle 11 and the gear 10 are surrounded by the housing 13, which has a blind flange or cover 14 is closed. If during operation of the mill the impact jacket lining is largely worn in its original position, the cover 14 is removed and with a nut wrench or the like, the spindle 11 and thus the gearwheel 10 are rotated. Here, the support ring 7 partially unscrews from the feed ring 8 and provides the parts of the impact jacket lining that have hitherto been deprived of wear and tear, the outlets of the channels 4 opposite. By raising and lowering the support ring, this can be done without any essential Operating sub- Breaking the building material of the impact jacket lining are largely used before they are renewed and the mill for longer periods of time Time must be taken out of service.

It is advisable to have a baffle ring prepared with lining, before the one in the mill is replaced, so that only one standstill of the mill over the time of the exchange of the old impact ring for the new impact ring needs to be accepted. During the further operation of the mill can then the old baffle ring can be equipped with a new lining.

Claims (2)

PATENT CLAIMS: 1. Centrifugal mill, in which the grinding stock is fed axially to the mill rotor rotating around a vertical axis and throws it from the inside to the outside through channels against a fixed, closed impact jacket, the height of which exceeds the height of the outlets of the mill rotor and the is arranged displaceably parallel to the mill axis, according to patent 1 044 567, characterized in that the impact jacket (5) is lined with a lining (16) made of sintered ceramic. 2. Centrifugal mill according to claim 1, characterized in that the impact jacket lining (16) consists of several segments (16 ') and is provided on its rear side with strong rounded corners. Documents considered: German Patent No. 480-882; German Auslegeschrift No. 1006 242; U.S. Patent Nos. 2155 697, 2,357,843, 2627376.