Improvements in Grinding Mills.
Year: 1896

page_text: Date of Application, 24th Nov., 1896-Accented, 16th Jan., 1397
COMPLETE SPECIFICATION.
Improvements in Grinding Mills.
1, CARL LUDWIG AUGUST SCHÜTZE, of 55-56 Alt Moabit Berlin, Germany,.
Manufacturer, do hereby declare the nature of this invention and in what manner
the same is to be performed to be particularly described and ascertained in and by
the following statement :-
This invention relates to improvements in roller mills for the disintegration of
ores, slag, coal, and similar material and consists in the arrangement of hinge.l
supports which connect the grinding rollers, and further in the arrangement of an
air propeller which discharges the sufficiently disintegrated material from the mill
by suction, sieves being provided for sorting the ground material.
In order that my invention may be the better understood I now proceed to
describe the same, reference being had to the accompanying drawings and to the
letters and figures marked thereon. Like letters refer to like parts in the various
figures.
Figure 1 shows a vertical section through the mill.
Figure 2 shows a transverse section therethrough.
The material to be ground is fed into a hopper r and passes thence into the
drum-shaped mill T. A transporting screw s may be provided between the hopper
and the mill, to serve to regulate the quantity of material fed into the saine.
A grinding ring m is arranged in the lower part of the grinding chamber in the
interior of which run rollers w. The latter pivot loosely on bolts which are
attached by hinges g to an arm a fixed to the axle of the mill. The bolts are
further connected by hinges g¹ to an arm a situated loose on the axle of the mill..
Thus the two rollers, the hinges g g' and the arins a a' form a kind of Nuremburg
shears.
The axle of the mill is rotated by means of a pulley attached thereto or in any
other suitable manner, and when thus rotated presses the grinding rollers w against
the grinding ring m. The material between the grinding ring and the grinding
rollers is therefore disintegrated.
If one of the rollers should meet with increased resistance, while rolling on the
grinding ring, say by the accumulation of the material at any part or by very
coarse pieces contained therein, and if such increased resistance tends to force the
roller away from the grinding ring, the centrifugal force of this roller and of the
other will counteract this tendency. The advantage attained hereby is that
the rollers perform their grinding work without interruption, whereby the capacity
of the mill is increased.
Ventilating vanes f, are provided on the axle of the mill, above the grinding
ring and within the mill drum, which, rotating quickly, produce suction, which acts
on the air contained in the drum, accelerates the feed of the material to be ground,
and at the same time causes the finely disintegrated material and such of low
specific gravity to rise. A further function of the vanes is to throw the ground
material, which has been caused to rise and has come within reach of the vanes,.
against sieves, b, arranged in front of the discharge pipes c for the ground
material.
The sieves b allow the sufficiently disintegrated material to pass, while the
coarser pieces are rejected and pass again within reach of the grinding rollers w.
Four discharge pipes and four sieves are arranged in order to utilize for the

page_text: passage of the material the larger part of the drum within which the ventilator
vanes rotate. For the purpose stated the number of sieves aud discharge pipes
may be increased.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1st. A roller mill for ore, slag, coal, and similar material, in which rollers ware
pressed by centrifugal force against a fixed grinding ring m, constructed so that
the axles of the grinding rollers to pivotally connected to the inill axle by arms a
fixed to the mill axle, are also convected in pairs among one another by hinges g¹
which engage with an arm a' turning loosely around the axle of the mill.
2nd. In combination with the roller mill claimed in Claim 1 the arrangement of
ventilator vanes f on the axle of the mill above the grinding ring m which suck up
the finely disintegrated material and throw it against sieves b arranged in front of
the discharge pipes c.
Dated this 24th dow of Noremben 1906
FELL & JAMES,
.1 Queen Victoria Street, London, E.C., Agents for the Applicant.