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Патент USA US3062387

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Nov 6, 1962
B. E. PALM
3,062,375
ROTARY SCREENING APPARATUS FOR SEPARATING -
DIFFERENT KINDS OF MATERIALS IN MIXTURES
Filed Oct. 16, 1958
3 Sheets-Sheet 1
W
@JWWI
Nov. 6,_ 1962
B. E. PALM
3,062,375
ROTARY SCREENING APPARATUS FOR SEPARATING
DIFFERENT KINDS OF MATERIALS IN MIXTURES
Filed Oct. 16, 1958
3 Sheets-Sheet 2
Nov. 6, 1962
B. E. PALM
3,062,375
ROTARY SCREENING APPARATUS FOR SEPARATING
DIFFERENT KINDS OF MATERIALS IN MIXTURES
Filed Oct. 16, 1958
3 Sheets-Sheet 3
" f?
a),
States
ie
ate t
1
3 062 375
ROTARY SCREENING ’APP’ARATUS non SEPARAT
llNG DIFFERENT KINDS OF MATERIALS IN
MIXTURES
Bel-til Emanuel Palm, P.0. Box 163, Mobodarne, Sweden
Filed Oct. 16, 1958, Ser. No. 767,692
Ciaims priority, application Sweden Oct. 14, 1957
6 Claims. ((11. 209-303)
3,062,375
Patented Nov. 6, 1962
Z
and with the shaft and partakes in the individual rotary
movement of the drum. Said conveyor will prevent any
amount of the mixture from falling straight through the
drum in the axial direction of the same, but will force
the mixture to move along the helical path also when the
centrifugating speed is very low.
The exit ends of the screen drums project through
corresponding openings in a disk con?ning an outlet
chamber for coarser material, while ?ner material is
The invention relates to a rotary screening apparatus 10 obtained through an annular outlet chamber surround
ing the plurality of screen drums.
for separating different kinds of materials forming the
Thus, the invention will render it possible to select any
constituents of mixtures, especially for separating ?ner
centrifugating speed, even a very low centrifugating speed,
materials from coarser materials in mixtures.
and under the control of the two movements (viz, the
Apparatus of this type are well-known, in which one
or generally a plurality of screen drums are arranged to 15 revolving centrifugating movement and the individual
rotary movement) the helical conveyor strip will cause
perform a combined movement, viz. a revolving (cir
a positive and exact feeding of the mixture helically along
culating) movement around a rotation center disposed
laterally to the respective screen drum as well as an in
the surrounding screen surface so as to secure an effec
tive ?ltering action. The possibility of using a low cen
dividual rotary movement around its own axis, wherein
the ?ner material is forced radially through the surround 20 trifugating speed will also reduce the stresses imposed
upon the screen-in surfaces, which for the screening of
ing perforated surface of each screen drum on account
paper pulp and the like have to be made with a very ?ne
of the centrifugal action of the revolving movement which
perforation and consequently also of a thin sheet mate
takes place with a relatively high speed, While the in
rial. In addition, the mounting of the screen drums is
dividual rotary movement ‘of the screen drums, which
takes place with a relatively low speed, causes .a cleaning 25 facilitated as they are supported by means of the helical
conveyor strips.
or clearing of the screen surfaces of the drum as the
sections of said surfaces are successfully turned against
said rotation center. Apparatus of this kind having no
Further objects of the invention and features of the
same will appear from the following speci?cation when
transport screw means movable relative to the screen
read in conjunction with the accompanying drawings, in
drum surface, have the advantage that the wear of the
screen surface is essentially reduced. However, the ad
which:
FIG. 1 is a vertical central cross-section through the
apparatus according to one embodiment of the invention;
FIG. 2 is a horizontal diagrammatic cross-section taken
vance of. the coarser material through the screen drums
has not been su?‘icient, nor was the separation of water
from wet mixtures effective. For eliminating these dis
along the lines 11-11 in FIG. 1;
FIG. 3 is a horizontal diagrammatic cross-section taken
advantages it has been suggested to provide the inside 35
along the lines III——III in FIG. 1;
of the screen drum surface with helically extending guid
FIG. 4 is a vertical central cross-section similar to
ing surfaces forming inwardly open spiral channels.
These guiding surfaces or channels create some improve
FIG. 1 but illustrating a modi?cation;
FIG. 5 is a vertical central cross-section through a
ment, but because they are entirely open towards the
center of the drum they, similar to screen drums without 40 screen drum, including modified conveyor means.
helical guiding surfaces, require a rather high centrifugat
ing speed in order to secure that the material actually
passes along the same. Now, in certain cases,,on account
In the ?gures of the drawings the same reference
numerals are used throughout for corresponding elements
or parts.
of difficulties regarding the supply of material into the
In FIG. 1, reference numeral 1 indicates a base mem
drums or in view of the requirement of a soft or delicate 45 ber of the frame, upon which a bottom plate 2 is se
treatment, the centrifugating velocity must be very low,
curely mounted. Said bottom plate supports a central
but then the open helical channels do not secure an ad
stationary sleeve 3 and a cylindrical housing 4, attached
to said plate. In the stationary sleeve 3 the upright main
vancing movement of the material in a helical path along
shaft 5 is rotatively mounted, said shaft extending verti
the screen surface, but the material will in part. fall axially
and straight through the interior of the screen drum. 50 cally through the apparatus and having its lower end con
As a typical example of such a case the treatment of
nected with transmission means 6, 7 for imparting to the
paper pulp may be mentioned.
same a rotary movement from a driving motor (not
The primary object of the invention is to avoid the
shown).
dit‘?culties mentioned above by simple and expedient
Between two spaced disks 9 and 10 attached to the
means, and in particular both securing a positive advance 55 main driving shaft 5 a plurality of vertical secondary
movement of all material in a helical path along the
shafts 11 are rotatively mounted, which secondary shafts
inside of the screen surface and avoiding Wear of the
support each a corresponding screen drum 12 over a heli
screen surface. Another object of the invention is to
cally extending conveyor strip 13 ?rmly connected or en
facilitate the mounting of the screen drums. A further
gaging both with the shaft and the surrounding screen
object is to secure an effective ?ltering action while pre 60 surface. The screen drums 12 may be made of perfo
venting the coarser material from intermingling with the
rated sheet metal, having slots or circular apertures. Sev
?ner material.
eral conveyor strips 13 may be disposed in each individ~
According to the invention at least one conveyor strip
ual screen drum is a way similar to that of a double
extending helicaily within each screen drum and being
thread screw. The drum shafts 11 extend downwardly
?rmly connected with the same, has a lateral dimension
through the bottom disk 9 and supports each a respective
or width covering substantially the whole distance from
chain wheel 14 (see also 1FIG. 3), these chain wheels 14
the individual axis of the drum to the surrounding screen
supporting a chain 15 extending around the plurality of
surface of the same. The axis of the drum is formed
said chain wheels. One of the drum shafts 11 (the right
by a shaft which preferably extends throughout the entire
hand one in FIG. 1) has an extension 11' supporting a
drum and may be made with a relatively great diameter, 70 bevel gear wheel 16 meshing with a bevel gear wheel 17
and said conveyor strip is ?rmly connected or engaging
attached to the end of a horizontal shaft lhrmounted for
both with the surrounding screen surface of the drum
rotation in brackets 119V and 2t). Said brackets are sup
3,062,375
3
ported by the disk 9 and rotatable with the same. The
horizontal shaft 18 supports a worm wheel 21 meshing
with a stationary screw thread 22 provided on the station
ary sleeve 3. Thus, when the main driving shaft 5 is ro
tating together with the disks 9, 10, a rotation is im
parted to the transmission means 22, 21, 18, 17, 16 for
rotating said one drum shaft 11, 11’, the rotation of said
4
screen surface having apertures of larger size will form a
strainer so that a separate strainer is super?uous. By the
provision of one intermediate screening surface a high
quality pulp may be obtained through the circumference
of the outer screening surface, while a second quality is
obtained from the annular space around said intermediate
screening surface. If two intermediate screening surfaces
are provided, the high quality pulp is obtained from the
one drum shaft being transferred to the remaining drum
shafts over the chain transmission means 14, 15. The
outer one of the two annular spaces, while water to
gear ratio should be selected such that the drum shafts ro 10 gether with resins are obtained through the circumference
tate more slowly than the main shaft. For instance, the
of the outer screen surface which can be made of a rather
drum shafts could be driven with a speeed of 50 revolu
?ne ?lter material. Thus, the invention will also realize
tions per minute, while the main shaft is driven with a
the object of creating an apparatus of a compact construc
speed of 800 revolution per minute.
tion for performing several different functions.
The top disk 10 supports a conical cover 23 having a 15
FIG. 4 illustrates an apparatus incorporating the modi
central inlet 24 for the mixture to be separated, as well as
?ed structure stated above, having a plurality of screen
guiding channel-shaped sections 25 for conducting the
drum units or sets, each comprising two concentric screen
mixture and distributing the same into the individual
drums 12' and 12” of different diameter, the inner one 12’
screen drums 12. The plurality of screen drums 12 is en
having perforations of greater size than the outer one
closed by an outer stationary casing 26 supported by the 20 12". The inner screen drum 12' is supported by the
housing 4- and being wider than the same. The casing
shaft 11 over the conveyor strip 13', and the outer screen
26 forms an annular space 27 around the plurality of
drum 12" is supported by the inner screen drum 12’ over
screen drums, said space constituting an outlet chamber 27
the conveyor strip 13". Immediately above the lower
for the ?ner material obtained through the perforated
ends of the inner screen drums 12' the disk 32' extends,
screen surface of the screen drums 12 and communicat 25 which is attached to the main shaft 5 and is provided with
ing with an outlet conduit 28. The screen drums 12 have
vanes 31’. The outer screen drum 12" has its lower end
their lower ends disposed at some distance above the bot
disposed at some distance above the disk 32', and a fur
tom disk 9, an outlet chamber 29 being formed above said
ther disk 32" extends immediately above the lower ends
disk for the coarser material obtained through the lower
of the outer screen drum 12". A stationary cover 35 is
open ends of the screen drums. Said outlet chamber 29
disposed on the top of the outer casing 26 and a station
communicates with an outlet conduit 30 for the coarser
ary bearing 36 may be provided for the top end of the
material, and the bottom disk 9 may be provided with
main shaft 5, said top end then being extended above the
vanes 31 for assisting the rotating bottom disk in moving
cover 35.
said coarser materials outwards. Immediately above the
The mixture to be separated is supplied to the inner
lower ends of the screen drums there is provided a disk 35 one of the concentric screen drums, as also indicated in
32 attached to the main shaft 5 and having openings for
FIG. 4, the ?ner material passing through the perforations
the individual screen drums. Said disk 32 forms a parti
tion between the two outlet chambers 27 and 29.
It may be assumed, that a mixture in the form of a sus
advancing downwards along the respective conveyor strips
of the respective screen drums, and the coarser material
13' and 13". Above the disk 9 there is formed the out
pension of materials of different particle sizes is supplied 40 let chamber 29 for the coarser material, obtained through
to the inlet 24 while the screen drums 12 are revolving
the open lower ends of the inner screen drums 12’ and
rapidly around the main shaft 5 and rotating slowly on
their own individual shafts 11. The suspension is distri
discharged through the outlet 30. When using the ap
main shaft 5 is removed by the action of the centrifugal
through the lower open ends of the annular spaces formed
around the inner screen drums 12’ after passing through
the perforated circumference of the inner screen drum
paratus for wood pulps or paper pulps such coarser mate
buted to all screen drums 12, the ?ner material being cen
rial could be the substances comprising the knots or the
45
trifugated out of the screen drum surfaces through the
like. Above the disk 32’ there is formed an outlet cham
portions which are turned away from the main shaft 5,
ber 29’ for a material of medium particle size, for in
while clogging material in the portions facing towards the
stance a second quality pulp, which material is obtained
force with respect to the main shaft 5. The individual ro
tation of each screen drum 12 on its own shaft 11 is
adapted to successively turn succeeding segments of each
screen drum towards the main shaft for being cleaned.
12', said material being discharged through the outlet 30’.
The material having the ?nest particle size, for instance
paper pulp of the highest quality, is obtained through the
The suspension is advanced through each screen drum 12,
moving along the associated conveyor strip 13, while the
perforated circumference of the outer screen drum 12"
?ner material is successively centrifugated out through the 55 and is collected in the outlet chamber 27 to be discharged
perforated surfaces of the screen drums. The coarser ma
through the outlet 28.
terial is obtained as a residue at the lower ends of the
FIG. 5 illustrates a modi?cation of the conveyor means.
screen drums. On account of the centrifugal force
As appearing from this ?gure, the conveyor strip can be
caused by the revolving (circulating) movement the con
interrupted at spaced points along its extension, whereby
veyor strips 13 will have an advancing effect on the ma 60 separate conveyor members 13"’ are formed, also having
terial, the ?ner material being centrifugated out through
the perforations while the conveyor strip prevents the same
from passing freely in the axial direction, and a de?nite
discharge of the coarser material being secured without
intermingling with the ?ner material.
For separating a plurality of materials of different par
ticle sizes in a mixture, each individual screen drum may
be divided in two or more concentric annular spaces by
means of one or more intermediate cylindrical screening
surfaces, conveyor means or strips being disposed within
each such concentric drum and ?rmly connected with the
same. Thus, there is formed, around each individual sec
ondary shaft, a unit comprising several concentric drums.
Apparatus of such modi?ed structure are well suited for
use as pulp screening apparatus or strainers, as the inner
guiding surfaces for the material, extending helically and
constituting propeller-like transport members. The vanes
13"’ are ?rmly connected both with the shaft 11 and
with the screen drum 12, for rotating with the same.
It should be understood that the apparatus according
to the invention may be utilized for numerous purposes
in spite of the simple structure of the same. Thus, as
indicated above, it can be used not only for separating
?ner materials from coarser materials in liquid suspen
sions, for instance for separating coarser and ?ner ?bres
and resins in cellulose pulps (wood pulps or paper pulps),
separating the knots or the like from pulps or removing
the water from paper pulps or other wet masses, but it
75 can be used also for separating mixtures in the solid
5
3,062,375
state, comprising particles of different sizes, for instance
milled or ground mixtures. Further examples of use are
in the separation of fatty mixtures in slaughtering yards
or houses and in whale cookeries, the separation of oil
mixtures, the cleaning or purifying of certain materials,
as well as the cleaning of waste water (sewerage).
It should also be understood that the apparatus de
scribed above and illustrated in the drawings could be
mounted also horizontally or inclined, that is, with a
horizontal or inclined driving main shaft, the structure
of the apparatus being generally the same.
The embodiments and modi?cations shown in the draw
ings and described above are intended to illustrate the
invention by way of example and not to limit it other
than necessitated by the scope of the appendent claims.
I claim:
1. An apparatus for separating different kinds of ma
terials forming the constituents of a mixture, comprising,
a main shaft, means for imparting a rotary movement
to said main shaft, a plurality of screen drums disposed
screen drum disposed concentrically around each sec-'
ondary shaft and supported by the same for rotation to;
gether with said conveyor strip, said screen drum having
its lower end disposed at some distance above said disk,»
an outlet chamber being formed above said disk for ma
terial obtained from the lower ends of said screen drums,
a second disk attached to said main shaft immediately
above the lower ends of said screen drums, at least one
further conveyor strip extending helically around eacr
individual one of said screen drums and being attached to
the same, at least one further screen drum disposed con
centrically around each individual one of said ?rst-men
tioned screen drums and forming annular space around
the same, said further screen drum being supported by
said further conveyor strip for rotation together with the
same, said further screen drum having its lower end dis
posed at some distance above said second disk, an outlet
chamber being formed above said second disk for material
obtained from the lower ends of said further screen drums,
a third disk attached to said main shaft immediately above
around and supported by said main shaft for receiving
the lower ends of said further screen drums and an out
a revolving movement around the same, shafts each ex
let chamber being disposed around said further screen
drums for material obtained through the circumference of
tending axially within one of said individual screen drums,
transmission means for imparting an individual rotary
movement to each individual shaft of said screen drums,
simultaneously with said revolving movement, and at least
one conveyor strip extending helically within each of said
screen drums and being ?rmly engaged ‘both with the re
spective screen drum and with the individual shaft of
the same for supporting said respective screen drums
from said individual shafts a disc at the ends of said
drums to which material therein is conveyed by said
conveyor strips, said disc having openings adjacent said
drums respectively for discharge of coarser material, and
means forming an annular outlet chamber surrounding
said drums for receiving ?ner material separated from
said further screen drums.
4. In apparatus for separating different kinds of ma
terials forming the constituents of a mixture, in combina~
tion a plurality of sets of screen drums, means mounting
said sets at locations angularly spaced from each other
about a central axis from which said sets are spaced
radially, each of said sets of screen drums comprising a
plurality of drums of different diameters arranged con
centrically with each other about common axes, respective
ly, which are parallel with said central axis, means for im
parting to said screen drum sets revolving movement
about said central axis, means for imparting to each of
said screen drum sets individually rotating movement
the coarser material.
about their individual axes respectively, simultaneously
2. An apparatus for separating different kinds of ma
terials forming the constituents of a mixture, comprising,
an upright main shaft, means for imparting a rotary
with said revolving movement, and at least one conveyor
movement to said main shaft, screen walls forming a
surface extending helically within each of said concentric
screen drum sets and partaking in the individual rotary
movements of said screen drum sets, respectively.
5. An apparatus for separating different kinds of ma
plurality of upright screen drums disposed around said
main shaft, shafts each extending axially within one of
terials forming the constituents of a mixture, comprising,
said individual screen drums, a disk attached to said main
shaft below the lower ends of said screen drums and
screen drums revolving movements around a center lo
rotatably supporting said individual shafts of said screen
drums for causing a revolving movement of said individ
ual shafts around said main shaft, said disk also con
?ning an outlet chamber for material obtained from the
lower ends of said screen drums, a second disk attached
to said main shaft immediately above the lower ends of
said screen drums and an outlet chamber being disposed
around said plurality of screen drums for material ob
tained through the screen walls of said screen drums,
transmission means for imparting an individual rotary
movement to each individual shaft of said screen drums,
simultaneously with said revolving movement, and at least
one conveyor strip extending helically within each of said
screen drum and being ?rmly engaged both with the re
spective screen drum and with the individual shaft of the
same for supporting said respective screen drum from
a plurality of screen drums, means for imparting to said
cated laterally to said screen drums, shafts each extend
ing axially within one of said screen drums, means for
imparting to each of said shafts an individual rotary move
ment around its own axis, sumultaneously with said re
volving movement of said screen drums, a plurality of
conveyor strips at least one of which extends helically
Within each of said screen drums respectively and being
?rmly engaged both with the surrounding screen surface
of said screen drum and with said respective individual
shafts of said screen drums for supporting said screen
drums from said individual shafts, a disc at the ends of
said drums to which material therein is conveyed by said
conveyor strips, said disc having openings adjacent said
drums respectively, for discharge of coarser material, and
means forming an annular outlet chamber surrounding
said drums for receiving ?ner material separated from the
coarser material.
said individual shaft.
6. An apparatus for separating different kinds of ma
3. An apparatus for separating different kinds of ma
terials
forming the constituents of a mixture, comprising
terials forming the constituents of a mixture, comprising, 65 a plurality
of screen drums, means for imparting to said
an upright main shaft, means for imparting a rotary move
ment to said main shaft, a disk attached to said main shaft,
a plurality of secondary upright shafts disposed around
said main shaft and rotatably supported by said disk for
performing a revolving movement around said main shaft,
transmission means for imparting an individual rotary
movement to each of said secondary shafts, simultaneous
ly with said revolving movement, at least one conveyor
screen drums revolving movements around a rotation
center located laterally to said screen drums, shafts each
extending axially within one of said screen drums, means
for imparting to each of said shafts an individual rotary
movement around its own axis, simultaneously with said
revolving movement of said screen drums, at least one in
termediate screen drum surface disposed concentrically
Within each of the surrounding screen surfaces of each of
strip extending helically around each individual one of
said screen drums for dividing the same in at least tWo
said secondary shafts, and being attached to the same, a 75 concentric spaces, respectively, at least one conveyor strip
3,062,375
8
extending helically within each of said intermediate screen
drums and being ?rmly engaged both with the screen sur
faces of said intermediate screen drums and with said in
dividual shafts for supporting said intermediate screen
drums from said individual shafts, and at least one further 5
conveyor strip extending helically within the concentric
space formed around each of said intermediate screen
drums, said further strips being ?rmly engaged both with
said intermediate screen drums and with the surrounding
121,192
300,545
1,172,634
1,839,941
2,149,877
2,822,127
Page ________________ __ Nov. 21,
Wiegand _____________ __ June 17,
Savage _______________ __ Feb. 22,
Zelezniak ______________ __ Jan. 5,
Wuensch _____________ __ Mar. 7,
1,141,875
France ______________ __ Apr. 30, 1955
screen drums respectively for supporting the last-men- 10
tioned screen drum from said intermediate screen drum.
.
References Qited in the ?le of this patent
UNITED STATES PATENTS
1871
1884
1916
1932
1939
Sinn __________________ __ Feb. 4, 1958
FOREIGN PATENTS
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