Improvements in Pneumatic Malting Drums.
Year: 1888

page_text: Date of Application, 21st Sept., 1888
Complete Specification Left, 28th Jan., 1889
Complete Specification Accepted, 9th Mar,- 1889
RESERVE COF
PROVISIONAL SPECIFICATION.
Improvements in Pneumatic Malting Drums.
I, JULIUS HENNING, Engineer, residing at No. 10, Salzufer, Charlottenburg, near
Berlin, in the Kingdom of Prussia, do hereby declare the nature of this invention to
be as follows:-
My invention relates to the pneumatic rotative malting-drums such as described
in the specification to the British patent dated April 23rd, 1884, No: 6,728; and
its object is to render more uniform and permanent the passage of the air through
the mass of grain or malt contained in the drum.
The said drum consists of a cylinder having head-plates with central apertures, a
partition-plate forming with one of the head-plates an air-passage, a number of
perforated peripheral conduits communicating with the said passage, and a per-
forated central conduit communicating with the aperture of the opposite head-plate,
the drum being connected by one of its central apertures and suitable pipes to a suction
or blowing apparatus, whereby a current of air is caused to pass through the same
and to permeate the grain or malt contained therein. For the purpose of stirring
the grain or malt, the drum is slowly rotated.
These drums, as heretofore constructed, are imperfect for three reasons:-First,
the perforations (holes or slits), through which the air issues from the grain or
malt, are apt to become choked with bran, germs and particles of grain. Secondly,
as the drums are not filled entirely, and as the mass of material surrounding the
central conduit is therefore less thick opposite to the empty space of the drum, the
air passes too freely through the portion of reduced thickness. Thirdly, the air-
current taking a more or less oblique direction from the inlet-end of the induction-
conduit or conduits to the outlet-end of the eduction-conduits or conduit, the portion
of material in the corner formed by the central conduit and the partition-plate, to
which it is fixed, is less supplied with air than the other portions.
-
In order to obviate these defects, the perforations through which the air passes outward
from the grain or malt, are made flaring, i.e. widened out in the direction of the
air-current; an obstruction of the perforations by particles of the material being

page_text: thereby avoided. Moreover, an obturating plate is arranged in the aforesaid air-
passage whereby the peripheral conduits are closed at their open end when they
are uncovered by material, and finally, the partition-plate is provided with perfora-
tions establishing a communication between the air-passage and the interior of the.
drum;
the said perforations allowing ingress of a portion of the air endwise to the
body of material, or egress from the same, accordingly as the current may be
directed.
Dated the Eighteenth day of September 1888.
CARL PIEPER,
Agent for the Applicant.
Improvements in Pneumatic Malting Drums.
I, JULIUS HENNING, Engineer, residing at No. 10, Salzufer, Charlottenburg near
Berlin, Kingdom of Prussia, 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 pneumatic rotative malting-drums such as described in
the specification of the British patent No. 6728 of April 23rd, 1884, and its object
is to render more uniform and permanent the passage of the air through the mass
of grain or malt contained in the drum.
The said drums consist in a cylinder having head-plates with central apertures,
a partition-plate forming with one of the head-plates an air-passage, a number of
perforated peripherical conduits communicating with the said passage, and a per-
forated central conduit communicating with the aperture of the opposite head-
plate, the drum being connected by one of its central apertures and suitable
pipes to a suction or blowing apparatus, whereby a current of air is caused to pass
through the same and to permeate the grain or inalt contained therein. For the
purpose of stirring the grain or malt the drum is arranged to be slowly rotated.
These drums as heretofore constructed, are imperfect for three reasons. Firstly,
the perforations (holes or slits) through which the air issues from the grain or malt,
are apt to become choked with bran, germs and particles of grain. Secondly, as the
drums are not filled entirely, and as the mass of material surrounding the central
conduit is therefore less thick opposite to the empty space of the drum, the air
passes too freely through the portion of reduced thickness. Thirdly, the air-current
having more or less an oblique direction from the inlet-end of the induction-conduit
or conduits to the outlet-end of the eduction-conduits or conduit, the portion of

page_text: material being in the corner formed by the central conduit and the partition-plate, to
which it is fixed, is less supplied with air than the other portions.
In order to obviate these deficiencies, the perforations through which the air passes
outward from the grain or malt, are made flaring, i.e. widening out in the direction
of the air-current, an obstruction of the perforations by particles of the material being
thereby avoided. Moreover, an obturating-plate is arranged in the aforesaid air-passage.
whereby the peripherical conduits are closed at their open end when they are uncovered
by material, and finally, the partition-plate is provided with perforations establishing
a cominunication between the air-passago and the interior of the drum, the said per-
forations allowing a portion of the air to pass end wise into the body of material, or to
issue from the same, according as the current may be directed.
On the annexed sheet of drawings Fig. 1 represents in longitudinal sectional eleva-
tion a malting drum provided with my improvements. Figs. 2 and 3 are transverse.
sections thereof on the respective lines and y y, Fig. 4 shows a modification of the
same, and Fig. 5 is a section of the central air-conduit drawn to a larger scale.
The drum consists in the cylinder C, the head-plates C₁ C², the partition-plate D.
forming with the plate C¹ the air-passage N, the peripherical conduits E commu-
nicating with the passage N and perforated towards the interior of the drum, and the
perforated central conduit F communicating with the central aperture I¹ of the
plate C. The plate C has the central aperture 1. To the rims of the apertures I and I¹-
are riveted short tubular attachments rotatively connected with, and suitably
tightened against, the respective stationary pipes L and K, one of which leads to
a suction or blowing apparatus, not shown in the drawing, while through the other
one moistened, cooled, heated or other air is supplied or air issues, as the case may be..
The drum is carried by the rollers G, and it is fitted with teeth H with which gears
the worin M for slowly rotating the same. C³ is the door through which the material
is introduced.
As regards the improvements, the Figures 1, 2 and 5 show the central conduit F·
provided with perforations of conical form, tho narrower end of the same being at.
the surface of the conduit which is in contact with the material to be treated, so that.
all solid particles entering into the perforations will, on passing the narrower end,
immediately find a wider sectional area and be carried onward by the current, which in
this case is directed from the conduits E' to the conduit F, as shown by the arrows in
the said figures, the perforations thus remaining permanently free for the passage of air.
If the current is directed inversely, i.e. from the conduit F to the conduits E, as in
Fig. 4, the perforations e of the latter are made conical. Instead of imparting to these
perforations a round form, they may, however, also be made oblong or in the form of
slits widening out in the direction of the current.
In order to close the conduits E at their open end when, by the rotation of the
drum, they have come into the free space h, Fig. 2, or opposite to the portion of
material of reduced thickness, the obturating plate O is arranged in the air-passage N,
opposite to the said space, the plate being placed forward of the vertical center-line of
the drum relatively to the direction of rotation of the latter, as, on account of the
material being carried upward by the motion of the drum, the space h has such position.
For keeping the plate O in the proper place, it is fixed, as shown by Figs. 1 and 3, to
one arm of a lever R pivoted on a pin S; which projects from the partition-plate D,
while the other arm of the lever is provided with a weight S¹ being sufficiently heavy
to keep the plate O always in the same position independently of the rotation of the
drum. The said plate O may, however also be fixed to an arm R¹, Fig. 4, which, in
its turn, is fastened to the pipe L.
d are the perforations through which air enters from the air-passage N endwise into
the body of material in case the current is directed as in Fig. 1, and through which it.
issues end wise therefrom if the current has the opposite direction, as shown in Fig. 4.
The said perforations are preferably arranged in groups alternating with the conduits E,
and they inay consist in round holes or in slits, as stated in respect to the perforations e
and f. Besides, it is advantageous to inake them widening out in the direction of the
current, the same as the latter.

page_text: "
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:
1. A rotating malting-drum having the head-plates CC² with central apertures I I¹,
the partition-plate D, and the perforated conduits E and F, in combination with means
for creating a current of air from one of the apertures II' to the other, the conduit
or conduits through which the air issues from the drum having their perforations
widening out in the direction in which the air-current passes through them, substantially
as and for the purpose described.
2. The combination, with a rotating malting-drum having the head-plates C¹³ with
- central apertures I I¹, the partition-plate D forming with the head-plate
the
passage N the perforated peripherical conduits E communicating with the passage N
and perforated central conduit F communicating with aperture 1, of the obturating-
plate O, whereby the conduits E are closed during a part of the rotation of the drum,
(substantially as and for the purpose specified.
3. A rotating malting-drum having the head-plates C C with central apertures I I',
the partition plate D, and the perforated conduits E and F, the partition-plate D
being provided with the perforations d, substantially as and for the purpose set forth.
Dated the Twenty fourth day of January 1889.
CARL PIEPER,
Agent for Applicant.