Improvements in Disintegrating Mills, and in Means for the Discharge of the Ground Material therefrom.
Year: 1896

page_text: Date of Application, 16th Sept., 1896
Complete Specification Left, 24th Nov., 1896-Accepted, 2nd Jan., 1897
PROVISIONAL SPECIFICATION.
Improvements in Disintegrating Mills, and in Means for the
Discharge of the Ground Material therefrom.
I, CARL LUDWIG AUGUST SCHÜTZE of Nos. 55 and 56 Alt Moabit,
Berlin N.W. in the German Empire, Manufacturer do hereby declare the nature
of this invention to be as follows:-
This invention relates to a mill for the disintegration of earthy materials,
particularly coal, and further to the combination of such mill with apparatus in
such a manner that only such material is discharged from the mill, which has been
disintegrated to a high degree; if desired, to fine powder. This invention is also
designed to separate the ground material according to the size of the grain and
specific gravity.
This mill is a centrifugal mill with horizontal axis to which are fixed, by means.
of a common boss, double arms, arranged cross-like alternately to one another.
Bolts are passed through the ends of the double arms, which bolts carry rollers.
The bore of the latter is considerably larger than the diameter of the bolts.
When the mill is in operation, the rollers are forced against a grinding ring,
arranged on the casing or frame of the mill, and thus disintegrate, between them-
selves and the milling ring the material introduced into the mill.
Two passages are arranged from the mill as exhaust channels, which are'
connected to an exhaustor; the delivery tube of the exhaustor enters into a
chamber arranged aside thereof: This chamber, which has approximately the
form of an inverted pyramid, is divided by a vertical partition into two
compartments in which a horizontal zig-zag passage is constructed by means of
partitions.
The air drawn from the mill by the exhaustor and carrying the finely ground
material enters into the first compartment of the chamber, passes through the
zig-zag path and allows the material, thrown against the partitions, to fall into
the lower part of the compartment. The fine dustlike particles of the ground
material, which are of low specific gravity, pass through an orifice into the second
compartment of the chamber, where they are moved up and down, and are
separated and pass into the lower part of this compartment. The air, freed from
the ground material, passes through a third passage from the second compartment
of the chamber back to the mill, where it becomes again mixed with ground
material and is again drawn off by the exhaustor and so on.
The material to be disintegrated is introduced into a hopper under which is
arranged a screw with spirals of various pitch. The screw passes the material,
through an orifice in the side of its casing into the before mentioned third passage,.
from which it falls into the mill, the operation in the third passage being
accelerated by the current of air therein.
The feed of the material is regulated by an adjustment of the before mentioned
screw in such a manner that spirals of greater or less pitch, as may be required,
are brought under the lower orifice of the hopper.
The discharge of the ground material collected in the lower parts of the before
mentioned compartments of the chamber is also effected by means of a screw.
The admission orifice to both compartments can be closed by slides. Therefore, if
both slides are drawn so as to free the orifices, the ground material may fall into

page_text: the screw from both compartments of the chamber, and in such case the screw
serves as a mixing device as well as a transporting device. However by opening
first one of the orifices and then the other, by means of the respective slides, the
ground material may be discharged separately from each compartment. The
discharge may be effected separately and simultaneously, if two screws are
provided instead of one, and one is connected to one of the orifices and the other
screw to the other orifice.
Dated the 16th dor of Sontombo- 1000
FELL & JAMES,
Agents for the Applicant.
Improvements in Disintegrating Mills, and in Means for the
Discharge of the Ground Material therefrom.
I, CARL LUDWIG AUGUST SCHÜTZE, of Nos. 55 and 56 Alt Moabit,
Berlin, N.W., in the German Empire, 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 a mill for the disintegration of earthy materials
particularly coal, and further to the combination of such mill with apparatus in
such a manner that only such material is discharged from the mill, which has been
disintegrated to a high degree; if desired to fine powder. This invention is also
designed to separate the ground material according to the size of the grain and
specific gravity.
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 is a front view of the apparatus, partly in section.
Figure 2 is a side view and shows a partial section.
Figure 3 shows a vertical section of the separating chamber, which forms part
of the apparatus, and Figure 4 shows a horizontal section of such chamber.
The mill M, Figures 1 and 2, is a centrifugal mill with horizontal axle. To the
latter are fixed crosses or arms through the ends of which pass bolts which carry
rollers w. The rollers each have a central hole which is considerably larger than the
diameter of the bolts. If the mill is in operation, the rollers are thrown against a
milling ring arranged on the casing of the mill, and thus disintegrate between
themselves and the milling ring the material fed into the mill.
A passage L, Figure 1, is arranged from the mill which is divided into two
channels, which serve as suction channels and are connected to an exhaustor E.
The delivery tube of the exhaustor enters into a separating chamber K arranged
at the side thereof, Figure 2. The separating chamber K which has the form of
a funnel, is divided by a vertical partition into two compartments k k¹ in which
zig-zag passages are formed by partitions and ¹ respectively.
The air drawn from the mill by the exhaustor and carrying the finely ground
material enters into the first compartment k of the chamber, passes therethrough in
a zig-zag path and allows the material, thrown against the partitions to fall into
the lower part of the compartment. The fine dustlike particles of the ground
material, and those of low specific gravity, pass through an orifice o into the second
compartment k¹ of the chamber, where they are moved up and down and are
separated and pass into the lower part of this compartment. The air, freed from
the ground material, passes through a channel from the second compartment back

page_text: to the mill, where it becomes again mixed with ground material and is again drawn
off by the exhaustor and so on.
The material to be disintegrated in introduced into a hopper under which is
arranged an adjustable screw z with spirals of various pitch. The screw feeds the
material into the mill at a place near the orifice g of the channel 12, or direct into
the latter, so that the material falls into the mill at a speed accelerated by the
current of air which passes through the channel. The regulation of the feed of
the material is effected by adjusting the movement of the screw z, so that spirals of
greater or less pitch are brought under the lower orifice of the hopper u.
The discharge of the ground material, collected in the lower parts of the before-
mentioned departments of the chamber, is effected by two screws & s situated on a
common axle, one having a left-hand and the other a right-hand thread. Short
tubes are provided on the shell of the screw from which the sacks are suspended
for the reception of the ground material. Alternatively the screws may be arranged
below the chamber K in such a manner that the ground material passes to the
screws from both compartments, in this case the screws serve to mix the material
as well as to transport it. Or, two double screws may be used, one of which
receives the ground material from one compartment of the chamber K and the
other from the other compartment. In all cases the regulation is effected by means
of slides e el, which are inserted into the lower part of the compartments.
Single screws may be arranged instead of the double screws, particularly for
comparatively small plants.
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. An apparatus for the disintegration of minerals, such as coal, consisting of
a mill M in combination with an exhaustor E and a funnel shaped chamber K
divided into two compartments and provided with zig-zag parts k k by means of
partitions fixed therein the exhaustor feeding the air, carrying the ground material,
into the chamber K, and thence, after the separation of the ground material, back
into the mill, substantially as and for the purposes described.
2nd. In an apparatus as claimed in Claim 1, the arrangement of the pipe and
air pipe on the mill so that the material to be fed into the mill falls into the latter
near the air passage leading thereto, or direct into the air passage, in order to
utilize the current of air for transporting the material.
2
3rd. In an apparatus for the disintegration of minerals such as coal, as claimed
in Claim 1, the arrangement of a screw with spirals of various pitch below the
hopper u of the mill and means for adjusting the screw relative to the hopper
in order to permit of the regulation of the material entering into the mill
substantially as described.
FELL & JAMES,
1, Queen Victoria Street, London, E.C., Agents for the Applicant.