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Патент USA US3055609

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Sept. 25, 1962
H. MUND
3,055,597
CENTRIFUGAL MILL WITH WIND SIFTER
Filed June 5, 1961
2 Sheets-Sheet 1
HEINRICH MUND
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Sept. 25, 1962
H. MUND
3,055,597
CENIRIFUGAL MILL WITH WIND SIFTER
Fileà June 5, 1961
2 Sheets-Sheet 2
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3,055,597
Patented Sept. 25, 1962
2
the outside. By this arrangement it is possible to seg
.
regate chips of too large a size as well as foreign bodies,
such as rocks, gravel, metal pieces, and the like from the
chip material before the same passes to the beater and
3,055,597
CENTRIFUGAL MILL WITH WIND SIF'I‘ER
Heinrich Mund, Springe, Deister, Germany, assigner to
Metallwerk Bahre K.G., Springe, Deister, Germany, a 5 screens of the mill. The different screens of the mill are
firm of Germany
also exchangeable and may thus be provided in accord
Filed June 5, 1961, Ser. No. 114,882
ance with the particular types of wood to be worked upon
Claims priority, application Germany June 11, 1960
and in accordance with the desired chip sizes and the type
Claims. (Cl. 241-49)
and quality of the chip boar-d to be produced.
10
The objects, features, and advantages of the present in
The present invention relates to a centrifugal mill
which is provided with a Wind sifter yfor preparing the
vention Will become more clearly apparent from the fol
lowing detailed description thereof which is to be read
With reference to the accompanying diagrammatical draw
ings, in which:
chips for producing chip board with gradually blended
layers.
For the proper preparation of the chips for the pro 15
FIGURE 1 `shows a side view of the centrifugal -mill ac
duction of chip board with gradually lblended layers it is
cording to the invention and of the associated fan; while
of great importance to form a mixture which is sum
FIGURE 2 shows a front view, partly in section, of the
ciently segregated into coarser and liner chips and which
centrifugal mill a-s seen in the direction of the arrow II
is thereafter treated with glue or adhesive and formed
into boards.
20
In the art of producing chip iboard, there have been
prior disclosures of centrifugal mills for the further size
reduction of the Wood chips which are supplied by a chip
producing machine. These centrifugal mills are equipped
in FIGURE 1.
Referring to the drawings, the chip material to be
treated is fed to the centrifugal mill by means of a con
veyor belt 3 from which it drops through feed hopper
4 into a chamber 5 into which an air current enters from
one side in a substantially horizontal direction. The
with screens of the same aperture lsize and therefore only 25 front part 6 of chamber 5 is equipped with parallel ver
produce chips of substantially the same size. When these
tical guide plates 7 which exert a directing effect upon
known mills were used for producing the conventional
the air current. 'I'he opposite Wall 8 of chamber 5 is
three-ply board, in which the two outer layers consist
provided with air outlet openings which are adjustable
of fine chips and the central layer of coarser chips, it
by means of shutter plates 9. From these outlet open
`was necessary to produce two different grades of chips 30 ings the air passes into a channel 10 Which is connected
which could not be done at the same time by the same
through a pipe 11 to the suction intake of a fan 12.
The beater 18 of the centrifugal mill is of a conven
tional construction except that the screens 13, 14, and 15
have different aperture sizes. These screen are arranged
centrifugal mill.
It is an object of the present invention to provide a
centrifugal mill which is capable of producing a mixture
of wood chips in which the coarse and iine chips are ex 35 in such a manner that screen 13 with the largest aper
ture size is located closest to the vertical plane which
tensively segregated and which obviates the previous neces
sity of providing separate centrifugal mills for producing
extends through funnel 4, that is, farthest toward the left,
chips of different sizes.
as seen in FIGURE 1. The screens with progressively
For attaining this object, the invention consists in pro
smaller aperture sizes are then located in the direction
40
viding the centrifugal mill with screens of different aper
of the air current and screen 15 With the finest aperture
ture sizes and in subjecting the chip material which is to
size is located farthest toward the right, that is, most
be further reduced in size to a wind-sifting treatment while
remote from the air inlet 6. Consequently, the coarser
falling from a hopper toward the screens. The screens
chips which are least exposed to the horizontal current
with a larger aperture size are thus supplied primarily
are driven through screen 13 with the largest aperture
with coarser chips, While the screens with a smaller aper 45 size, while the finer chips which are taken along by the
ture lsize are supplied primarily with chips of a smaller
horizontal air current for the greatest distance pass
size. The coarser chips which are then treated by the large
through screen 15 with the smallest aperture size. The
size screen or screens are then broken up only slightly
greatest part of the chips, that is, of the coarse as well
and may thereafter -be used for forming a solidifying
as of the fine chips, is subjected to a further size reduc
wooden framework or base within the cent1-al part of the 50 tion by screens 13, 14, and 15. However, this screen
chip board While a part of the finer chips are broken up
arrangement also prevents the desired coarser chips from
further by the finer screens to such an extent that the
being broken up too much. The result of the entire ar
outer layers of the chip board will have a structure which
rangement is that the chip material is segregated to the
desired sizes.
ticle, and smooth outer surfaces.
The mill according to the invention may be further
A -further feature of the invention consists in providing
provided with an adjustable flap 16, as indicated in FIG
the chamber of the centrifugal mill above the screens with
URE 1 in dot-and-dash lines which may be adjusted to
horizontally directed air inlet openings and the opposite
different positions to eliminate from chamber 5 through
wall of the chamber with adjustable air outlet openings
an outlet 17 any foreign bodies, gravel, metal parts, and
60
which lead to an air-collecting channel which is connected
the like as Well as chips which are too large. A control
to the suction intake of a fan. It is thus possible to adjust
flap 19 in channel 10 may also be adjusted to different
the centrifugal mill in accordance with the particular com
positions for regmlating the air current passing through
position ofthe chip material. A further advantage which
chamber 5 in accordance with the most suitable operat
insures that the chips board will have uniform, line-par
55
is thus attained is that the same air current which is used
ing conditions.
for conveying the chip material may also be used for sift
ing the material in the centrifugal mill.
According to one preferred embodiment of the inven
tion, the centrifugal mill is also provided near the lower
end of its chamber and substantially perpendicularly un
derneath the -feed hopper with an opening leading toward
Although the invention has been illustrated and de
scribed With reference to the .preferred embodiments
thereof, it should be understood that it is in no Way
limited to the details of such embodiments but is capable
of numerous modifications within the scope of the ap
pended claims.
3,055,597
The invention having now been fully disclosed, what
is claimed is:
1. A centrifugal mill comprising a chamber having
side walls and one substantially open side forming an
air inlet, an open lower end, and air-outlet apertures in
the side wall opposite to said inlet, a feed hopper at the
upper end of said chamber within a plane near said
inlet side for passing a loose chip material into said cham
ber, means for passing an air current through said inlet,
said chamber, and said outlet apertures for sifting the 10
material falling from said hopper into larger and smaller
chips so that the larger chips will move downwardly
within an area of said chamber near said inlet and the
' smaller chips will move downwardly Within areas more
remote from said inlet, a centrifugal beater underneath
the open lower end of said chamber and adapted to re
ceive the chips falling through said chamber and a plu
rality of screens having different aperture sizes at least
partly surrounding said beater, the screen having the
largest aperture size being disposed underneath said area 20
4
move downwardly within an area of said chamber near
said inlet openings and the smaller chips will move down
wardly within areas more remote from said inlet open
ings, a centrifugal beater underneath the open lower end
of said chamber and adapted to receive all of said chips
falling through said chamber, a plurality of screens hav
ing different aperture sizes at least partly surrounding
said beater, the screen having the largest aperture size
being disposed underneath said area near said inlet open
ings and adapted to receive the larger chips from said
chamber, and the screen having the smallest aperture
size being disposed underneath the area most remote
from said inlet openings and adapted to receive the small
est chips from said chamber, and a container also con
nected to said suction fan for receiving the chips passed
through said screens.
3. A centrifugal mill as deiined in claim l, further
comprising means for adjusting the size of said outlet
apertures.
4. A centrifugal mill as defined in claim 2, further
comprising means Within said collecting channel for con
trolling the air current passing therethrough to said suc
tion fan.
5. A centrifugal mill as delined in claim 1, in which'
near said inlet and adapted to receive the larger chips
from said chamber, and the screen having the smallest
aperture size being disposed underneath the area most
remote from said inlet and adapted to receive the smallest
25 said mill chamber has an outlet near its lower end at a
chips from said chamber.
point above said screens and substantially perpendicularly
2. A centrifugal mill comprising a chamber having
underneath said feed hopper 'for discharging foreign
side walls, an open lower end, substantially horizontally
bodies and chips of too large a size from said chamber.
extending air inlet openings in a first of said side walls,
and air outlet openings in the opposite side wall, an air
References Cited in the ñle of this patent
collecting channel connected to said outlet openings, a 30
feed hopper at the upper end of said chamber within a
UNITED STATES PATENTS
plane near said first side wall for passing a loose chip
775,004
Freid _______________ __ Nov. l5, 1904
material into said chamber, a suction fan connected to
1,834,981
Stebbins ______________ __ Dec. 8, 1921
said collecting channel for drawing an air current through
Arnold ______________ __ Jan. 16, 1945
said inlet openings, said chamber, and said outlet open 35 2,367,179
ings for sifting the material falling from said hopper into
larger and smaller chips so that the larger chips will
2,764,361
Moore ______________ __ Sept. 25, 1956
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