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Патент USA US3099504

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July 30, 1963
Filed June 6, 1961
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United States Patent 0
Marvin C. Heinze, Clark, N.J., assignor to FMC Corpo
ration, a corporation of Delaware
Filed June 6, 1961, Ser. No. 115,260
3 Claims. (Cl. 302—~31)
Patented July 30, 1963
sheets close to the discharge end to keep the outlet con
tinually clear. As wet or caking material tends to arch
or form bridges and consequently to impede the out?ow,
particularly Where the out?ow and is narrower than the
feed end, prevention of these arches is necessary.
The sheet which may be either an inert ?exible plastic
sheet or a ?exible metal sheet is ?xed to the container
Wall by any convenient means. A bolted metal band
across the upper edge has been found to be acceptable.
This invention relates to a feeding device for moving
material which normally tends to build up on the walls of 10 protrusion
The band should
of the heads
be as of
thintheas fastening
possible with
devices so that
the device.
When moist particles, or particles having a tendency
the next higher overlapping sheet will protrude away from
to cake, are contained in a storage container or must be
the container wall as little as possible. Use of a band hav
passed through an open-end chamber, the particles tend
ing bolts stud-welded to the surface in contact with the
to agglomerate, or become compacted, or adhere to the 15 plastic sheet is preferred.
walls of the container. This often results in stoppage of
?ow or complete blockage of the discharge end of the
Prior devices for overcoming these di?iculties have in
volved periodically-pulsating mechanisms within the con 20
tainer. Such mechanisms are mechanically activated metal
plates, in?atable elastic sheets alternately in?ated and
The opening for the ?uid should be so positioned below
the sheet to obtain the maximum vibration at minimum
pressure. To accomplish this, the ?uid access is prefer
ably placed from 1A to ‘1/2 the length of the sheet from
the upper edge. Of course, this distance may be even
greater causing air to be introduced below the midline of
the sheet, but then less agitation will result.
It will be noted [that the operation may run continu
ously so that air or other ?uid will enter the container
?ow to ?uidize the particles have all been used. These
prior art devices have been expensive to operate, com 25 at all times. The vibration of the sheet is therefore not
caused by varying ‘the ?uid pressure but merely by apply
plex in design and often the cause of further di?iculties
de?ated by a ?uid pressure means, and a controlled gas
ing a steady pressure. A simple compressed air-line is
the only external mechanism required. Any inert gas
or liquid could be equally applied if required. The sheet
calcing materials from adhering to the inner walls of a 30 responds to ‘the ?uid pressure by a rippling motion, con
container; to provide a simple device capable of causing ' tinually receiving and spilling the ?uid. This rippling
of operation.
This invention has the following objects: to provide a
novel, simply-designed apparatus for preventing moist or
vibration dislodges ‘any caking which may occur and pre
vents adhesion of the particles to the sides.
Of secondary effect is the force of the ?uid upon the
end; and to provide a container apparatus in which con 35 particles, as well as upon the sheet. Since the sheet per
mits the ?uid to pass into the container, some blow-down
tained material can be e?ectively discharged in a steady
action is also to be expected. If the air pressure, for ex
vibratory movement within a container; to provide a feed
ing device having vibratory sheets which will not permit
wet particles to agglomerate or compact at the discharge
Other objects will become apparent as fuller descrip
tion of the invention is given.
According to this invention, the apparatus, designed to
accomplish the above objects, is a feeding device con
sisting of a container with an open upper end, a discharge
opening adjacent its lower end, a plurality of ?at sheets
of ?exible material a?ixed along the upper edge thereof
to the inner walls of the container above the discharge
opening, and means under the sheets for introducing a
ample, is very high, the particles will, in turn, gravitate
more rapidly.
The sheets may be made of any substance ordinarily
inert to the conditions within the container and to the
particles that are passed through. Flexible metal sheets
have been mentioned earlier as suitable.
Natural and
synthetic rubbers, poly?uorocarbons, polyvinyl chlorides,
linear polyamides, polyethylene, poly(ethylene) aromatic
esters, and other thermoplastic sheeting material may also
be used in this invention. The surface quality of the
constricted flow of a ?uid of suf?cient force to cause the
sheet should be smooth and preferably slick to prevent
?exible sheets to vibrate in such a manner that moist
particles falling through the container are prevented from 50 material buildup on it. Of particular interest is poly
rtetra?uoroethylene sheeting which possesses excellent ?ex
adhering to the sides.
ibility over a wide temperature range and has a very slick
In the accompanying drawings, which are merely illu
surface. The almost complete inertness of this material to
trative of one form of the device of this invention,
common commercial reagents makes it particularly pre
FIGURE 1 is a top plan view of the device;
FIGURE 2 is a section through lines 2—2' of FIG. 1. 55 ferred in this invention.
In one preferred embodiment of this invention, wet
The operation of the apparatus will be described in con
polydiallyl phthalate ?lter cake was dropped into a hop
junction with these drawings. In FIGURES 1 and 2, a
per, similar to that shown in ‘the drawings, approximately
container 10 is ‘open at the top to receive the material
2 feet wide. Six sheets of Du Pont Corporation commer
which passes downward by gravity. Attached to the ?at
inner walls of the container, are \extendible or ?exible 60 cial-grade Te?on were clamped along the walls of the
container, substantially as depicted in the drawings. Each
sheets 11, secured by metal strips or other means 12
sheet, about 2 feet square, was clamped along the upper
along the uprn-ost edge of the sheet. Directly beneath each
edge by l-inch plates and two 1%; inch machine bolts. The
sheet are openings 13 in the container w-al-ls through which
?uid openings were positioned in the center of each sheet,
14. Air is a typical ?uid which may be passed through 65 about 1/3 of the length from the plate. An air pressure
of 90 p.s.i.-g. was passed into each opening. The vibra
a common valved duct v15, to the individual conduits.
tion of the sheets caused the particles to discharge with
The force of the air causes the ?exible sheets to vibrate
no material buildup on the walls of the hopper.
outwardly ‘agitating ‘the flow of the particles downward
Since all areas of the container walls must be reached
in a peristaltic fashion, thereby preventing the particles
from adhering to the walls ‘of the container.
by the vibratory action of the sheets, it is important that
rthere be no “dead” spots. To prevent areas of possible
When the container is a hopper-like chute, as shown in
FIGURE 2, it is preferred to position at least one set of
material buildup on the container walls, the sheets should
may pass some ?uid under ‘pressure, through conduits
(1) an open upper end for receiving said solids,
(2) a lower discharge end,
be preferably positioned or designed so as to overlap
the next descending sheet. Where the general shape of
the container is circular, ?at metal surfaces must be in
stalled inside the container against which the ?at, ?exible
sheets may rest so that, in.- eifeot, a pyramidal surface 5
results. Clearly more sheets will be needed in such an
arrangement than in square or rectangular containers.
In small rectangular containers, the width of the sheet
may be approximately the width of the container.
The ?uid apertures, as stated earlier, need not be 10
limited to the upper portion of the sheet, nor need there
be only one. A series of ponts may be arranged beneath
each sheet. If, in fact, the sheet is large enough so that
‘only one or two sheets will be required, depending on
(3) an inner lateral surface having positioned thereon
a plurality of thin, ?exible sheets substantially paral
'l-el, when at rest, to the said lateral surface, and ?xed
to said lateral surface along one direction thereof
and only at the upper edge of each sheet, the remain
ing edges being un?xed and free to move in such a
manner that the entire sheet below the ?xed edge
can be extended away from said surface, and
(4) a ?uid-introducing means, having access through
the lateral surface to a point 1A to ‘1/2 of the length
of the sheets from their t?xed upper edges directly
beneath each of said sheets, whereby the introduc
tion of a ?uid under pressure causes the free edges
the nature and volume of the container, many ports may
be placed in pre-designed positions to cause greater vibra
tion. The port may be a simple opening in the wall to
which is attached a threaded portion, such as a nipple,
for introducing an air-pipe.
of the sheets to extend away from the lateral surface
so that only the ?xed upper edge is in contact with
the lateral surface.
2. The feeding device 'of claim 1 in which the ?uid
The ?uid most convenient to use is air. The vsystem 20 is air.
3. The feeding device of claim 1 in which the sheets
may, however, be of the type in which an inert gas
are so positioned that each sheet overlaps the next de
blanket is desirable, and such ‘a gas as nitrogen may be
scending sheet.
applied. If the feed material is being passed into a drier
the vibratory action of the sheets will cause the caked
material to break up into smaller, more easily dried 25
References Cited in the file of this patent
particles. Any number of other variations of this inven
tion will be suitable in like operations.
This apparatus permits convenient handling of wet, or
caking materials when being stored or passed through a
container. Such containers as collection chutes, storage 30
silos, bagging machines, driers and other types of storage
vessels and feeders can be readily adapted to this inven
tion by simple means.
Based upon this description and upon obvious variations
within the scope of this invention, I claim:
1. A feeding device for caking solids comprising a con
tainer having
Dodge ______________ __ Aug. 20,
Filson _______________ __ Apr. 6,
Tainton _____________ __ Jan. 26,
Huston ______________ __ May 27,
Logan ________________ __ July 11,
Hampton etial _________ __ Aug. 10,
Shields _______________ __ Aug. 16,
Stambera ____________ __ Feb. 9,
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