Improvements in Machinery or Apparatus for Pulverizing or Reducing Ores or other Substances.
Year: 1888

page_text: Date of Application, 10th Jan., 1888
Complete Specification Left, 10th Oct., 1888
Complete Specification Accepted, 16th Nov., 1888
Improvements in Machinery or Apparatus for Pulverizing or
Reducing Ores or other Substances.
I, HUGO GRAEPEL of Budapest in the Kingdom of Hungary, Engineer do hereby
declare the nature of this Invention to be as follows:-
The object of my Invention is to provide machinery or apparatus for pulverizing or
reducing ores or other substances wherein the weights are so disposed that a minimum
of driving power is required and an equalized feed and a very efficient pulverizing or
reducing action is obtained. According to my Invention I provide a revolving drum
or chamber having two or more separate compartments with radial passages between
them through which the reduced substance passes into a screening passage or screening
passages arranged around the periphery of the drum or chamber. Inside each of the
compartments are balls rollers or the like which as the drum or chamber revolves are
caused to revolve or roll upon and reduce the substance being acted upon and they may
be caused to act also by impact by providing-the-compartments with shelves or pro-
jections which carry up the balls rollers or the like and then allow them to fall upon
the substance being operated upon. By arranging the drum or chamber with separate
compartments as described one or more (with the weight it or they carries or carry)
is or are descending on one side whilst the other or others of the compartments (with
the weight carried thereby) is or are ascending so that the rise of the latter is assisted
by the descent of the former and therefore less power is required to drive the machine
than would otherwise be the case. The material is fed into the compartments from a
stationary hopper passing through a plate around which revolves a feed chamber fixed
to the side of the drum or chamber and revolving with it. In the side of the drum or
chamber where this feed chamber is fixed are openings leading from the feed chamber
into each compartment and so situated that the substance is received into the com-
partments to the required extent only so as to ensure a regular feed and an equal or
approximately equal weight in each chamber. The compartments by preference have
each three sides two parallel to radii from the centre of revolution and one of these is
perforated or formed by a sieve the other of these sides and the third side are both

page_text: solid the third side being the circumference of the drum or chamber. Between the
radial sides of adjacent compartments are the aforesaid radial passages into which the
reduced material passes through the perforated or reticulated sides of the compartments
thence passing into the finer screening passage or passages arranged around the
periphery of the drum or chamber. These circumferential passages are preferably
arranged in sections corresponding to each compartment their hinder ends com-
municating with the radial passages and their forward ends being covered by screens.
When the machine is in operation the material reduced by the action of the balls or the
like passes through the radial sieves or perforated sides of the compartments and down
the radial passages into the circumferential passages and such as is fine passes
through the screen or screens thereof any material not sufficiently fine enough to pass
therethrough falling back as the machine revolves onto the screens over the forward
ends of the circumferential passages and can return by an opening into a compartment
to be again acted upon by the balls rollers or the like.
In place of or in addition to the screen or screens at the circumference there may
be a screen or screens in the radial passages.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C.,
Agents.

page_text: Improvements in Machinery or Apparatus for Pulverizing or
Reducing Ores or other Substances.
I HUGO GRAEPEL of Budapest in the Kingdom of Hungary Engineer 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 :-
The object of my Invention is to provide machinery or apparatus for pulverizing or
reducing ores or other substances wherein the weights are so disposed that a minimum
of driving power is required and an equalised feed and a very efficient pulverizing or
reducing action are obtained. According to my Invention I provide a revolving drum
or chamber having two or more separate compartments with radial passages between
them (or the equivalent as hereinafter explained) through which the reduced substance
passes into a screening passage or screening passages arranged around the periphery
of the drum or chamber.
Inside each of the compartments are balls rollers or the like which as the drum or
chamber revolves are caused to revolve or roll upon and reduce the substance being acted
upon and they may be caused to act also by impact by providing the compartments
with shelves or projections which carry up the balls rollers or the like and then allow
them to fall upon the substance being operated upon. By arranging the drum or
chamber in the separate compartments as described one or more (with the weight it
or they carries or carry) is or are descending on one side whilst the other or others of
the compartments (with the weight carried thereby) is or are ascending so that the
rise of the latter is assisted by the descent of the former and therefore less power is
required to drive the machine than would otherwise be the case. The material is
preferably fed into the compartments from a stationary hopper passing through a plate
around which revolves a feed chamber fixed to the side of the drum or chamber and
revolving with it.
In the side of the drum or chamber where this feed chamber is fixed are openings
leading from the feed chamber into each compartment and so situated that the
substance is received into the compartments to the required extent only so as to ensure
a regular feed and an equal or approximately equal weight in each chamber.
The compartments by preference have each three sides two parallel to radii from the
centre of revolution and one of these is perforated or formed by a sieve the other of
these sides and the third side are both solid the third side being the circumference of
the drum or chamber. Between the radial sides of adjacent compartments are the
aforesaid radial passages into which the reduced material passes through the perforated
or reticulated sides of the compartments thence passing into the finer screening
passage or passages arranged around the periphery of the drum or chamber. Or in
place of the radial passages and the perforated side thereof the said passages may be
dispensed with a portion of the peripherial sides of the chambers being perforated to
answer the same end.

page_text: The circumferential passages are preferably arranged in sections corresponding to
cach compartment their hinder ends communicating with the radial passages (or
where these passages are not used then communicating directly with the chambers)
and their forward ends being covered by screens or plates.
When the machine is in operation the material reduced by the action of the balls or
the like passes through the radial sieves or perforated sides of the compartments and
either directly into the circumferential passages or down the radial passages into the
circumferential passages and such as is fine enough passes through the screen or
screens thereof any material not sufficiently fine to pass therethrough falling back as
the machine revolves onto the screens or plates over the forward ends of the circum-
ferential passages and can return by an opening into the same or a following com-
partment to be again acted upon by the balls rollers or the like.
In place of or in addition to the screen or screens at the circumference there may
be a screen or screens in the radial passages where those passages are used.
And in order that my said Invention may be fully understood I shall now proceed more
particularly to describe the same and for that purpose shall refer to the several figures
on the annexed sheets of drawings the same letters of reference indicating corre-
sponding parts in all the figures.
Figure 1 is a half side elevation and half transverse section and Figure 2 is a
longitudinal section of a machine constructed according to my Invention.
A and A2 are the side plates of the machine to the one A2 of which the revolving
hopper or antechamber H with feed holes JJ is fixed. The interior of the drum is
divided into four chambers two of which it, the chambers CC are shewn in the
sections. The sides of these chambers are marked IL and L the side L' being
perforated. E' E are the projections which as the machine revolves in the direction
of the arrow F raise the balls or rollers D and thereafter allows them to fall as shewn
by the arrows G in the chambers C. These projections E E need not necessarily
be constructed as indicated in the drawing nor is it absolutely necessary that they be
attached to the side L3 of the chamber as they may be fixed to the side L or they
can be dispensed with. The material which has been sufficiently reduced to pass
through the holes of the side L' passes from the radial passages onto the riddles K¹ in
the circumferential passages. The mesh of the riddle K¹ is finer than the mesh of the
riddle L. The material that passes through the meshes of the sieve K¹ passes onto
the still finer sieve K through which the sufficiently reduced material passes out of the
machine. Any material which is not sufficiently reduced to pass through the sieves
passes over the inclined plates or sieves 02 01 through the openings M back into the
chambers to be again operated on by the bails or rollers. I preferably do not use
plates but sieves at 001 so that the reduced material does not return too quickly into
the chambers but is well exposed to the riddling action of the sieves K and K. Bis
the axle round which or with which the drum revolves. Between the several chambers
the aforesaid radial passages are shown through which the reduced material passes
from the sides I of the chambers onto the riddles or sieves K¹ as the machine
revolves.
The section Figure 2 is not taken in one straight line but the upper part is taken on
the line d Figure 1 and the lower part is taken on the line 6 Figure 1. In this figure
the rotary hopper or antechamber H is clearly shown. P is the fixed hopper secured
to the feed plate or bracket p. JJ are the feed holes through which the material
to be operated on passes from the revolving hopper or antechamber H into the
chambers of the drum itself. The opening at M is that through which the insufficiently.
reduced material returns from screens K and K into the machine.
The radial passages between the chambers can be dispensed with as the perforations
can be on that side of the separate chambers furthest away from the axle; the
insufficiently reduced material which passes through these perforations being in the
construction shown in Figure 3 as being returned to the next following chamber and
in Figure 4 being shown as being returned into the same chamber.
In the section view Figure 3 B is the axle C C C C are four chambers D1 D2 D³
forming the sides of the chamber C₁, D² D* D* forming the sides of the chamber C

page_text: D D D forming the sides of the chamber (3³, D7 D8 D³ forming the sides of the
chamber (, F F F F are perforations or holes in the sides D D D D through
which the reduced material passes on to the sieves K¹ K and as the machine revolves
in the direction of the arrow F, the insufficiently reduced material returns through
the openings M into the next following chamber the plates 01 02 being placed on the
incline from the periphery of the sieves K² K' to lead this material back into the
chambers through the openings M. E' E' E' E' are the projections which raise
the balls or rollers D and the material.
In Figure 4 I shew an arrangement wherein the insufficiently reduced material
returns through the openings M back into the same chamber to be again exposed to
the action of the balls or rollers the division sides D D D7 Ds between the chambers
being lengthened to the periphery of the sides K and bent forward in such a manner as to
prevent the material from passing on to the following chamber.
I do not bind myself to make these machines with an axlo through the centre with
which or round which the machine revolves, as the machine may be made without a
central axle and in place thereof it may rest on a set of friction rollers applied to the
periphery of the machine; so that on these friction rollers being made to revolve the
machine will revolve with them.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In apparatus for pulverizing or reducing by means of balls or the like the con-
struction of the drum of the apparatus with two or more chambers containing balls
or the like and counter-balancing each other round the axis of rotation of the drum
substantially as herein before explained.
2. The construction of ball or roller mills with an antechamber or hopper revolving
with the machine and provided with inlet openings to the drum substantially as
hereinbefore described.
3. In apparatus of the kind described and claimed the combination of circumferential
passages with sieves therein substantially as hereinbefore described.
4. The arrangements and combinations of parts constituting an apparatus for
pulverizing or reducing substances substantially as bereinbefore described and
illustrated in Figures 1 and 2 or modified as described with regard to Figures 3
and of the accompanying drawings.