Improved Apparatus for Drying Granular, Pulverulent, and other Substances.
Year: 1888

page_text: Date of Application, 4th Jan., 1888
Specification Accepted, 17th Feb., 1888
Improved Apparatus for Drying Granular, Pulverulent, and other
Substances.
I, CARL JACOB LANGEN of Grevenbroich Rhine Province, 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 an improved construction of apparatus for drying
substances, which I will proceed to describe with reference to the accompanying
drawings in which Fig. 1 shows a longitudinal sectional, Fig. 2 a transverse section,
and Fig. 3 a sectional perspective view of one of the receptacles.
The apparatus consists of a closed casing h in which are two endless bands or
chains a travelling round drums i from which are suspended a number of receptacles b
serving to contain the moist materials to be dried. These receptacles may be of
variously modified construction suited to the materials to be operated upon; they
may for example consist, as shewn at Fig. 3, of a flat bottom plate formed with
perforations, and having corrugated sides, which may also be perforated, the trough
like spaces thus formed being divided, if necessary, into a number of compartments
by means of fixed or moveable partitions which may be either flat or corrugated and
either perforated or not.
The receptacles filled with the materials to be dried are made to travel in the
direction of the arrow through the current of heated air rising up from the heating
apparatus c, which may be of any suitable known construction.
As the spaces
between the receptacles 6 are closed by the unperforated lateral extensions or flanges d
of these, which meet closely together as shewn the hot air is consequently forced

page_text: to ascend through the perforated bottoms thereof and thus to come into intimate
contact with the materials contained in the receptacles.
e that
After passing through the receptaclos the hot air is led by the partition
divides the casing into two parts, to the discharge pipef from which it escapes into
the open air. Into the space in the casing above the partition e but below the
bottoms of the upper row of receptacles, air of ordinary temperature or, if desired,
cooled air is forced or drawn in through the pipe and narrow opening so that
this cold air is also forced to pass up through the perforated bottoms of the receptacles
as these travel along and thereby effects the cooling of the material contained therein,
which arrives in the upper part of the casing from the lower part in a heated
condition. As the receptacle arrives at the opening A of the casing, the dried and
cooled materials are removed therefrom, and they are then charged with fresh moist
material before passing down into the lower compartment, so that the apparatus works
with continuous action.
In order to prevent the hot air from escaping at the two ends of the casing through
the openings that exist between this and the flanges of the receptacles as they pass
round the drums, rollers g are provided mounted in spring bearings, so that the
receptacles slide over them with their bottom surfaces, thus closing any lateral exit
and forcing the whole of the hot air to pass up through the receptacles.
In place of rollers may be employed spring flaps made to bear against the
underside of the receptacles.
.The receptacles are supported by rollers j running on rails k on the sides of the
casing as they are made to travel through the upper and lower compartments of the
casing with a slow motion imparted through the worm and worin wheel driving
gear actuating one of the drums i.
The spaces between the ends of the receptacles and the sides of the casing are
closed by flanges m m projecting from the latter underneath the former.
Having now particularly described and ascertained the nature of this invon-
tion, and in what manner the saine is to be performed, I declare that what I
claim is
1. In apparatus for drying materials, the combination of a casing divided by a
partition into an upper and a lower compartment, into the lower one of which hot
air, while into the upper one cold air is delivered, and horizontal endless travelling
bands, cords or chains stretched over rollers or drums and having suspended therofrom
receptacles containing the materials to be dried, the endless bands with the receptacles
being made first to travel through the lower compartment, where the materials are
subjected to the action of the hot air, and then through the upper compartment where
tho material is subjected to the action of the cold air, means being provided for
preventing the hot and cold air from passing otherwise than through the receptacles
in intimate contact with the materials to be treated, substantially as
described.
herein
2. In apparatus for drying materials, the combination of a casing divided by a
partition into an upper and a lower compartment through which hot and cold air are
made to flow respectively, horizontal endloss bands cords or chains stretched over
rollers or drums, from which are suspended trough shaped receptacles for containing
the materials to be dried, such receptacles having flat perforated bottoms and lateral
projecting flanges for closing the spaces between the receptacles, so that as these
travel consecutively through the lower and upper compartments the hot and the cold
air is forced to pass through the perforated bottoms of the receptacles in intimate
contact with the material contained therein, substantially as herein described.
3. In apparatus for drying materials, the combination of a casing divided by a
partition into an upper and a lower compartment, horizontal endless bands from which
flat bottomed receptacles are suspended that travel consecutively through the lower
and upper compartments, and rollers or equivalent appliances at each end of the

page_text: casing that are made to bear against the undersides of the receptacles so as to prevent
escape of hot air between the receptacles and the surface of the casing substantially as
herein described.
4. In apparatus for drying materials the combination of the casingh with
partition e, endless travelling bands a drums i supporting rollers ; and rails k,
suspended perforated receptacles 6 with flanges d rollers g or their equivalents, hot
air supply c and cold air supply r arranged and operating substantially as and for the
purposes herein described.