Improvements in Drying Kilns.
Year: 1895

page_text: Date of Application, 24th June, 1895-Accepted, 12th Oct.,
1895
CUMI LELE
Improvements in Drying Kilns.
We, Dr. LUDWIG KLIPPERT and THE UNION FABRIK CHEMISCHER
PRODUCTE, both of Stettin in the Empire of Germany, 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 an improved vertical drying kiln adapted to operate by
vibration or oscillation and has for its object to dry materials such as manure,
superphosphates gypsum, malt and the like and the invention consists in certain
improvements in the mechanism for suspending, and imparting motion to, the
shaking surfaces receiving the material to be dried, as well as in the method of
circulating the hot drying gases around the delivery shoot, for the purpose of
effecting a supplemental or final desiccation as required.
The invention will be best understood by reference to the accompanying
drawings illustrating an improved vertical kiln constructed according to this
invention but we do not limit ourselves to the precise details.
kiln.
Figure 1 is a front elevation and Figure 2 a side elevation of the improved
Figures 3 to 5 are sections thereof on lines x x, y y and z z (Figure 1)
respectively.
A and B are heating chambers forming a continuation of the fire chamber or
furnace and C, is the shaft or flue constituting the drying chamber proper.
After the said heating chambers and shaft or flue have been moderately heated,
the material to be dried is introduced into the kiln by placing it in a trough or
hopper D, of an elevator E. It is thence transferred and delivered by the
movement of the elevator otito the upperinost of a series of alternately inclined
shaking plates or frames a. Owing to the inclined position of these plates and to
the up and down and sideways motion imparted to them the material is caused to
pass from the top plate to that next below and then in succession; to each of the
remaining plates, all of which are subjected to the same shaking or reciprocating
motion. From the bottom plate the material drops into a channel or shoot F
(leading to the discharge door k) constituting a colleétor where the material may
be retained so as to be subjected to a final stage of drying and steaming by the
heated gases which pass upwards and round the said shoot by the passages K for
that purpose.
gases
The passages K are arranged both in the partition wall B¹ separating the
chambers A and B and also in the back wall A of the chamber; A. The gases
pass from the furnace into the chamber B and also by the flue B2 into the
chamber A whence they pass through the passages K in the walls A and B¹ into
the chamber C. C is a partition for preventing the direct passage of the
from the chamber A to the chamber C. The shaft or flue C of the kiln is fitted
with a number of spindles b arranged alternately to support which, special boxes.
or bearings, adapted to be cooled by cold air, are provided in the sides of the kiln.
On both sides of each of the spindles & lever arms c are arranged. From one of
the arms of each lever c one side of the shaking frame or plate a is suspended,
while the other side of such plate or frame is supported and connected by means
of a strong hinged or jointed link to the upper lever arm of the spindle following
next in succession. The said spindles b on one of the outer sides of the shaft or
flue C, are also provided with levers e, directed towards each other and terminating

page_text: in slotted heads taking into pins, mounted on a vertically pushing rod f. The said
rod f is guided as shown at g and is coupled by a connecting rod or link h which
is adjustable on the crank i, mounted on a rotating shaft on the top of the kiln.
Owing to this adjustability the extent of motion of the shaking frames (when
the shaft is rotated) may be varied and consequently the amount and quality of
the work to be performed by the kiln according to the amount of moisture to be
removed from the material to be dried and the time required for drying it.
The peculiar manner in which the inner double lever arms are adapted to move
towards each other, and the ares of circles which the operative points or portions
of such lever arms describe serve to impart to the plates or frames both an up-and-
down reciprocating motion and a lateral motion. Owing to the simultaneous
movement of the plates inwards and outwards, the momentum is, moreover,
properly balanced, so that any oscillation of the kiln itself is avoided, and a
smooth and even operation is ensured, which is perfectly safe from any interruption
through concussion shocks or jerks so that the masonry and other parts of the kiln
are protected from wear. The up-and-down motion of the plates or frames has
the effect of breaking up or loosening the material to be dried, whereby the action
of the hot gases is assisted, and more fully taken advantage of than has been
possible hitherto.
Owing to the hot gases circulating round the inclined shoot F by the channels K
this portion of the apparatus can be utilized for collecting considerable quantities
of material, so that such material may be subjected in bulk in such inclined
channel to a final drying stage, before it is allowed to drop out of the kiln by the
removal of the sliding door k.
Having now particularly described and ascertained the nature of our inven-
tion and in what manner the same is to be performed, we declare that what
we claim is :-
1. A vertical kiln for drying granular and other material having shaking
surfaces or plates which are superposed and inclined in alternate directions the
extent of motion or stroke of which is adjustable substantially as hereinbefore
described.
2. In a drying kiln such as is referred to in the first claiming clause connecting
the rod with shafts or spindles such as 6 supporting the shaking surfaces, such
as a through the medium of double arm levers such as e such connections being
made by means of levers such as e and of a vertically guided pushing rod f
substantially as herein before described and illustrated in the accompanying
drawings.
3. In a drying kiln of the class referred to in the first claiming clause con-
ducting the hot gases about the discharge shoot, such as F, through channels
such as K, for the purpose of submitting the material collected in the said shoot
to a final drying process substantially as hereinbefore described and illustrated in
the accompanying drawings.
.
Dated this 24th day of June 1895
JOHNSONS & WILLCOX.
47 Lincoln's Inn Fields, London, W.C., Agents.