Improvements relating to Mixing Machines employed in the Treatment of Granular and Pulverulent Substances.
Year: 1890

page_text: Date of Application, 18th Sept., 1890
Complete Specification Left, 4th Dec., 1890-Accepted, 17th Jan., 1891
PROVISIONAL SPECIFICATION
Improvements relating to Mixing Machines employed in the
Treatment of Granular and Pulverulent Substances.
I ROBERT HARTMANN of Dinglestaedt in the Empire of Germany, Miller, do
hereby declare the nature of this invention to be as follows:-
16
My invention relates to novel means employed in connection with the conveying
Mixing
or transporting of granular and pulverulent substances under treatment in
Machines." It consists of the following device: that is to say, a hopper, the interior
of which is divided into three parts by partitions disposed internally near its outside
walls and parallel therewith. The interior of the hopper will therefore consist of a
main central space and of two side interstial spaces, channels or passages and, at
suitable intervals in the depth of these latter, I mount, in pairs, the operating rolls
hereinafter referred to.
In the interior of the hopper above referred to and ranged in a direction co-incident
with the vertical axis thereof, are a series of bars of any suitable configuration in
cross section. Said bars run longitudinally and are parallel with the rolls above
referred to, and serve as "baffles" or deflectors to assist in transporting or conveying
to the rolls, the granular or pulverulent substances fed into the top or mouth of the
hopper of the mixing device."
Dated this 15th day of Sentember 1890.
JAMES
STEVENSON,
Gray's Inn Chambers, 20, High Holborn, W.C., Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements relating to Mixing Machines employed in the
Treatment of Granular and Pulverulent Substances.
1, ROBERT HARTMANN, of Dinglestaedt in the Empire of Germany, Miller,
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:-
My invention relates to the means employed in connection with the conveying and
transporting of granular and pulverulent substances under treatment in mixing
machines in such a manner that the different materials whether deposited in the
machine in layers, or in a partially mixed state, are caused to pass through the
machine a sufficient number of times and emerge therefrom in a thoroughly blended
powdered condition ready for immediate use or delivery.
In the annexed drawing Figure 1 is a vertical transverse section of my improved
machine and Figure 2 a vertical longitudinal section thereof, like letters of reference
denoting corresponding parts in each.
The materials to be treated are placed in the hopper a of the machine through
a suitable opening such as y, and, after being sufficiently treated emerge there-
from at the outlet s. The hopper a comprises two vertical ends t, t, and two
inclined sides u, u the interior being provided with two partitions, parallel
with and at a suitable distance from the sides u, u, so that, in addition to the
central chamber or hopper a for containing the materials to be treated, two separate
channels or receptacles k, k are formed one on each side of the hopper a between
the partitions, f³, and the sides u, u, for the purpose hereunder stated.
able number of horizontal rolls c, c, are arranged in pairs one above the other in
openings or breaks formed in the partitions f, f, and are mounted by their shafts d
in bearings d' carried by the ends t t. In addition to the rolls ce a pair c¹, c¹ are
A suit-

page_text: disposed at the bottom of the hopper a with their axes in the same horizontal plane
and immediately above the worm or conveyor g and parallel thereto. This worm or
conveyor driven by the pulley m is provided with a pinion p gearing with the
wheel p' of one of the rolls c¹, motion being transmitted to the rolls c by an endless
chain or belt gearing with the toothed wheels or pulleys r, the pinions 9, q',
secured to the shafts d at the opposite end of the rolls enabling one roll to rotate the
other, the peripheries of the rolls in contact therefore rotating in the same direction.
Instead of arranging the rolls in pairs they may be driven separately, or, more
than two may be geared together; I however prefer that the rolls shall rotate in a
direction which will enable the materials to be delivered free from "balling."
Two or more deflecting bars, plates or inclined planes k¹ preferably of a prismatic
or triangular shape in cross section are disposed within the hopper in a
direction parallel with the longitudinal axes of the rolls and coincident with the
vertical axis of the hopper, the apex of each bar or plate being contained within the
vertical axis, said bars or plates serving to divert the materials as they pass through
the hopper a towards the rolls c, c. An elevator is contained within the casing hand
raises the materials conveyed into it by the worm g from the bottom of the hopper a
and channels k, k, into the upper worm i along which they pass again into the hopper a
until sufficiently mixed or assembled together. The outlet shoot or channel s is
disposed beneath the delivery end of the elevator, the materials passing from the
machine through said shoot on opening the sliding or equivalent check valve z. The
elevator is actuated by the pulley n of the lower worm g driving the pulley n', the
upper worm being rotated by the pulley o of the elevator spindle driving the
pulley o'.
When the different materials are placed in the hopper the horizontal layers of each
are conveyed through the rolls and channels into the lower worm where they are
mixed together in equal proportions and are raised by the elevator into the upper
or conveyor and from thence again into the hopper, this operation being
continued until the materials have been well assimilated, when the outlet valve z is
opened and the materials discharged through the shoot s.
worm
Assuming that the hopper a is charged with layers of three different materials in the
required proportions for a specific purpose, that is to say for instance the first layer of
charcoal, the second of sulphur, and the third or top layer of chlorate of potash in the
proportions necessary in the manufacture of gunpowder, then, the bottom pair of
rolls c, c will deliver charcoal, the next set of rolls sulphur, and the following
chlorate of potash, the three materials passing down the hopper and side channels
into the lower worm and thence into the elevator and again into the hopper a,
when the top layer will be composed of the mixed materials, which, in turn are
delivered into the side channels, and the operation continued until the whole is
thoroughly incorporated together.
Having now particularly described and ascertained the nature of my said inven
tion and in what manner the same is to be performed I wish it to be understood
that as I am aware prior to the date of my invention mixing machines have been
made with rolls operating in conjunction with worms and elevators, I therefore
make no claim in respect of same, but, what I claim and wish to secure by Letters
Patent is :-
:-
In a mixing machine of the type above specified the combination with the
rolls c, c, c, c, hopper a and channels k, k, of the deflecting bars or plates k¹ and
means for imparting motion to the various parts of the apparatus all as herein set
forth and shown in the accompanying drawings.
Dated the 4th of N1900
JAMES STEVENSON,
Gray's Inn Chambers, 20, High Holborn, London, W.C., Agent for Applicant.