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Патент USA US3082975

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March 26, 1963
c. D. PARTEN
3,082,962
PULVERIZING APPARATUS WITH OVERSIZE RECIRCULATION
Filed Jan. 28, 1959
4 Sheets-Sheet '1
I
Juan-h.
INVENTOR. _
@WZ ??riew
March 26, 1963
c. n. PARTEN
3,082,962
PULVERIZING APPARATUS WITH OVERSIZE RECIRCULATION
Filed Jan. 28. 1959
4 Sheets-Sheet 2
5303 E805043
INVENTOR.
30
J43
J5 ’
i BY54715242742’
ax?» 4/4/22; i
March 26, 1963
c. D. PARTEN
3,082,962
PULVERIZING APPARATUS wmx ovERsIzE RECIRCULATION
Filed Jan. 28. 1959
{@134
'
5” 14 .4: 85
4 Sheets-‘Sheet s
501E775
March 26, 1963
‘
c. D. PARTEN
3,032,962
PULVERIZING APPARATUS WITH OVERSIZE RECIRCULATION
Filed Jan. 28. 1959
4 Sheets-Sheet 4
INVENTOR. _
3,982,962
lzl’atented Mar. 26, 1963
1
2
3,682,962
FIG. 6 is a fragmentary sectional view taken along line
6—6 in FIG. 4;
Carl D. Parten, Minneapolis, Minn” assignor to ‘i’arten
Machinery Company, Minneapoiis, Mind, :1 corpora
grinding apparatus rotor axially offset from each other
for purposes of illustration;
PULVERiZlNG APPARATUS ‘WITH OVERSIZE
RECHRCULATIGN
tion of Minnesota
FIG. 7 is a view showing several of the parts of the
FIG. 8 is a left hand end view of the apparatus ‘as
viewed in FIG. 1;
FIG. 9 is an enlarged fragmentary partial sectional
View taken along line 9—9 in FIG. 8;
The present invention relates to a novel grinding or 10
FIG. 10 is an enlarged fragmentary cross sectional
pulverizing apparatus, and more particularly to a novel
view taken along line 10-10 in FIG. 3; and
so-called “air-swept” type grinder or pulverizer wherein
FIG. 11 is an enlarged fragmentary sectional view
the material to be processed is carried through the appa
taken along line 11-11 in FIG. 8.
,
ratus with a ?owing stream of gas or air.
Referring now more speci?cally to the drawings wherein
An apparatus of the type contemplated herein is ca 15 like parts are designated by the same numerals through
pable of grinding or pulverizing a material to provide a
out the various ?gures, an apparatus 20 incorporating
?ne powder. Frequently, it is desirable to obtain an end
features of the present invention is shown best in FIGS.
product which includes two or more powdered materials
1 and 3 and is provided with grinding or pulverizing
mixed together, but difficulties arise with respect to ob
chamber means 22 supported on a suitable base structure
Filed Ilan. 28, 1959, Ser. No. ‘7852554
'7 Claims. (Cl. 241—52)
tainin0 a substantially uniform mixture or blend of the 20 24. An assembly generally designated by the numeral
various powdered materials. It is, therefore, one im
26 is supported above the base means by a suitable frame
portant object of the present invention to provide a novel
structure 28 for feeding one or more ingredients to the
pulverizing or grinding apparatus for simultaneously proc
pulverizing or grinding means 22, and fan means 30 is
essing a plurality of materials in a manner so that such
associated with the pulverizing or grinding means 22 for
materials are substantially uniformly blended or mixed 25 drawing air or gas therethrough, which air or gas is
together.
It will be appreciated that certain materials to be ground
or pulverized can be damaged by the heat created ‘during
utilized for directing pulverizing material to a desired
point of discharge.
The pulverizing or grinding means 22 comprises ‘a
housing having a cylindrical outer wall 32 and an end
30
of the present invention to provide a novel apparatus
wall 34 having an ingredient inlet opening 36 there
the grinding operation, and it is, therefore, another object
which is constructed for more e?iciently cooling the mate
through. A grinding or pulverizing rotor generally desig
rial during the grinding operation so as to reduce any pos
nated with the numeral 38 is provided, which rotor has
sibility of injury to the material as a result of overheating.
an elongated shaft 4t? extending through a suitable open
Still another object of the present invention is to pro
ing in the end wall 34 and rotatably supported by bear
vide a novel grinding or pulverizing apparatus which 35 ings 42 and 44 mounted on the base means 24. The rotor
is constructed for more effectively classifying pulverized
shaft is driven by any suitable means such as an electric
material particles as to size and for recirculating larger
motor 46 having ‘a drive pulley 48 ?xed on its output
particles for regrinding.
.
shaft, which drive pulley is connected with a pulley 50*
A further object of the present invention is to provide
on the rotor shaft 40 by belt means 52. The rotor means
40
a novel grinding or pulverizing apparatus having pulveriz
is provided with a plurality of beater plates 54, 56 and 58
ing rotor means and fan blade means at an end thereof
?xed on the shaft 40 within the housing walls 32 and 34.
for moving air through the apparatus, which apparatus is
The beater plates which are preferably imperforate respec
constructed so as to support the rotor means at opposite
tively carry sets of peripheral circumferentially spaced
ends thereof.
beater blocks or blades 68, 62 and 64 and also sets of
Still another object of the present invention is to pro 45 blades or beater blocks 66, 68 and 70 at opposite sides
vide a novel grinding or pulverizing apparatus of the
thereof. In addition, the beater plate 54 has an annular
type described above having a fan housing over the fan
series of spaced blade or block members 72 ?xed on its
blade means, which fan housing is hingedly supported so
side facing the end wall 34 and spaced radially inwardly
as to facilitate access to the interior of the apparatus for
from the peripheral blocks.
50
maintenance or any other desired purpose.
Liner members 74 and 76 are disposed within the cylin
Other objects and advantages of the present invention
drical housing portion 32 and an annular liner member
will become apparent from the following description and
'78 is disposed against the inner surface of the housing end
the accompanying drawings wherein:
wall 34, which liner members respectively have inner ribs
. FIG. 1 is a perspective view showing an apparatus 55 or corrugations 80, 82 and 84 vas shown best in FIGS. 4
incorporating features of the present invention;
FIG. 2 is an enlarged fragmentary sectional view taken
along line 2—2 in FIG. 1;
and 5 for cooperation with the beater blades or blocks
to grind and pulverize material passing through the
vapparatus.
FIG. 3 is a partial substantially vertical and longitudinal
As will be understood, the material enters the milling
sectional view of the apparatus shown in FIG. 1;
60 chamber through the opening 36 with a ?owing stream
FIG. 4 is an enlarged fragmentary cross sectional view
of air or gas and is directed radially outwardly between
taken along line 4——4 in FIG. 3;
the beater plate 54 and the liner member 78. The par
FIG. 5 is a fragmentary sectional view taken along line
tially ground material then passes around the beater
5-—5 in FIG. 4;
plate 54 and between the beater plates 54 and 56 and
3,082,962
4
3
particles so that they may be recirculated in the manner
described below.
verizing action progresses, a circulating swirling motion
The cone plate 140 also carries a plurality of centrifu
is imparted to the air or gas and material entrained
gal fan blades 146 which are disposed within a housing
therein so that the larger particles gravitate toward the
148 of the fan means 30. As shown in FIG. 8, the
liner member 76. In order to obtain further pulverizing
housing has an outlet 150 which may be connected to
or grinding action on these particles, a reclassi?er or
suitable duct means, not shown, for directing the pul
bathe ring 86 is provided between the liner member 74
verized material to a suitable point of discharge or to
and 76 for directing the material radially inwardly so
suitable means, not shown, for separating the material
that it will be acted upon by the elements carried by the
beater plate 58.
10 from the ?owing air stream. It is to be noted that a
bearing 152 is ?xed on the end wall of the fan housing
Considerable heat will be generated by the grinding
14-8 and rotatably receives and supports the outer end
process as the material ?ows around the beater plates,
then around the beater plate 56.
As the beating or pul- ‘
and cooling ‘means is provided for preventing overheat
of the rotor shaft 40 whereby to improve the stability
of the rotor.
ing and injury to the material. In accordance with a
The fan housing 148 is secured to the housing section
feature of the present invention, more e?icient cooling 15
132 and it is to be noted that the section 132 is mounted
is obtained by forming channels in the liner members
so that it and thus the fan housing may be easily opened
74, 76 and 78 so that the liner members cooperate with
to provide access to the interior of the milling chamber.
the housing portions 32 and 34 to provide ?uid coolant
Referring particularly to ‘FIGS. 8, 9 and 11, it is seen
passageways 88, 90 and 92 as shown in FIGS. 3, 4, 5
and 6. It is important to note that with this arrange 20 that the means for mounting the housing 132 includes a
pair of parallel rods 154 and 156 axially slidably mounted
ment the coolant is in direct contact with the liner mem
in apertured lugs 158 and 160 respectively welded or
bers so that the most effective cooling of these liner mem
otherwise secured to the housing 32. A vertical pin 162
bers and, thus, the material being ground adjacent to and
contacting the liner members is obtained.
- i
has opposite reduced diameter end portions rotatably ex
The liner members 74 and 76 must ?t within the cylin 25 tending into bearing end portions 164 and 166 of the
parallel rods. A cotter pin 163 or the like extends
drical housing 32 snugly in order to prevent coolant from
through the upper end of the pin 162 for limiting down
leaking from the passageways 88 and 99. This is ac
complished easily and relatively economically in accord
ward movement thereof.
A sleeve 170 welded or other
wise secured to the housing 132 is pivotally supported by
ance with the present invention by splitting the liner
members 74 and 76 and by providing them with beveled 30 the pin 162. This enables the housing to be pivoted
about the pins 162 to and from the closed position shown
ends between which wedging blocks 98 and 160 are
in the drawings. It will be noted that in order to permit
forced. As shown in FIGS. 4 and 6, the wedge members
are respectively secured to studs 102 and 104 which ex
the bearing 152 to be assembled over the end of the
rotor shaft, the fan housing must be bodily moved axially,
in the housing wall 32. Nut members 110 and 112 are 35 and this movement is permitted by the rods 154 and 156
which may be shifted between the solid and broken line
threaded onto the outer ends of the studs for drawing
positions shown in FIG. 9. Outward movement of the
the wedge members ?rmly against the beveled ends of
rods is limited by ?anges 172 ‘and 174 respectively re
the liner members or rings so as to expand the rings into
tained, on reduced diameter end portions of the rods 154
aggressive engagement with the interior surface of the
cylindrical wall 32. Strips 114 and 116 of resilient seal 40 and 156 by nut members 176 and 178. Several fasten
ing means 180 are spaced around the periphery of the
ing material are provided between the wedging blocks
housing 32 for securing the housing 132 against the end
98 and 100, respectively, and the outer wall 32 for inter
of the housing 32. In the embodiment shown, each of
rupting the fluid passageways 88 and 91}. As shown in
these fastening means comprises a pair of lugs 182-484
FIGS. 1 and 4 a conduit 118 is connected with the cylin
drical housing wall 32 and communicates with both of 45 on the housing 32 and having a pin 186 extending there
between, and a latch. member 188 connected to the hous
the passageways 88 and 90 for directing liquid coolant to
ing section 132 and adapted to interengage with the pin.
the passageways at one side of the strips 14 and 16, and
The material to be pulverized is directed by down
a drain conduit 120 communicates with these passage
wardly extending duct means 199 from the feeding means
ways at the opposite sides of the strips. Similar strip
means 122 (see FIG. 4) is provided for interrupting the 50 26 to the inlet opening 36 of the milling chamber. An
tend outwardly through bushings 106 and 108 mounted
passageway 99, and branch ?uid inlet and outlet con
duits 124 and 126 are connected with the passageway 90‘
opening 192 at the upper end of the duct means is ad
justably controlled by a door 194 which may be held
in any desired adjusted position by suitable means such
at opposite sides of the strip 122. It will be appreciatedl
as a support arm 196. Thus, the effective size of the
thatthe ?uid inlet conduit 118 will be connected to any
suitable source of coolant such, for example, as water. 55 opening 192 may be changed so as to control the volume
and rate of air orgas ?ow through the apparatus.
In addition to the above mentioned beater plates, the
The pulverizing apparatus may be utilized for process
rotor includes a perforated mill plate 128 having a plu
ing various materials such, for example, food products
rality of small apertures 130 of predetermined size there
including sugar, various grains and many others. It is
through. Properly ground or pulverized material is car
ried by an air stream through the apertures 130 while 60 often desirable to obtain a ?nished product which includes
two or more pulverized ingredients mixed together such
relatively large particles of the material are retarded and
as a cake mix which includes flour and various ingre~
gravitate toward the periphery of the mill plate for re
dients. Such ingredients cannot be readily mixed uni
circulation in the manner described below.
formly after ‘they have ‘been ?nely pulverized. There
v .The rotor shaft extends from the mill plate through an '
fore, it is to be noted that the feeding means 26 is con
inwardly taperedrhousing portion 132 secured to the
structed so as to feed a plurality of ingredients simul
cylindrical wall 32. The housing portion 132 is formed
taneously to the milling chamber so that the ingredients
with internal substantially annular coolant passageway
will be thoroughly and uniformly mixed with each other
means 134 which is interrupted in much’ the same man
during the milling or' pulverizing process. Thus, as
ner as the passageway 90 and is connected with branch
coolant inlet and drain lines 136 and 138, respectively, 70 shown in FIGS. 1, 2, and 3, the feeding means is pro
’ vided with a pair of hoppers 200 and 262 separated by
as shown in FIG. 1. Adjacent the outer end of the hous
a partition 204, which hoppers may be ?lled with differ
ing portion 132, a cone plate 140 having apertures 142
therethrough is secured to the rotor shaft for further re
ent ingredients to be processed with or with the same in
tarding milled particles of relatively large size, and ‘blades
gredients if desired. Feed screws 206 and 208 extend
, 144 are secured to the cone plate for directing the larger 75 through the bottoms of the hoppers and means 210 which
‘3,082,962
5
6
provides separate passageways having outlet openings
within the duct means 190. Portions of the feed screw
rods extend rearwardly through tubes 21-2 and 214 and
are driven in timed relationship by output gears of a
transmission 216 having an input shaft 218. A sprocket
220 on the input shaft is driven by a chain 222 which ex
tends from a sprocket, not shown, on an output shaft 224
of a variable speed reducer unit 226 which is driven
by a motor uni-t generally designated by the numeral 228.
It will ‘be appreciated that by predetermining the rate at 10
which the feed screws 206 and 208 are driven with respect
to each other, the materials from the hoppers 200 and
202 are fed in predetermined proportions to the milling
parting from the spirit and scope of the appended claims.
The invention is claimed as follows:
1. A pulverizing apparatus of the type described com
prising :means providing a milling chamber having an in
let ‘adjacent one end and an axial outlet at its opposite end,
rotor means supported for rotation in said chamber means
for pulverizing material entering said inlet and imparting
circular motion to said material so that larger particles
tend to gravitate toward the periphery of said chamber
means, means providing a lateral opening in said cham
ber means upstream from said laxial outlet for receiving
pulverized particles gravitating toward the periphery of
the chamber means, means ‘disposed within said chamber
means and in the vicinity of the periphery thereof and of
In the embodiment shown, another ingredient hopper 15 the rotor means for direct-ing portions of said particles
230 having a feed screw 232 extending therethrough is
into said opening, and passageway means continuously
chamber.
'
disposed for directing another ingredient into the hopper
providing open communication between said lateral open
202 through an opening 234 in the end of the hopper
ing and said inlet for directing particles entering said
202. This enables an ingredient in the hopper 230 to be
lateral ‘opening back to the inlet.
mixed with the ingredient in the hopper 202 before the
'2. A pulverizing apparatus, as de?ned in claim 1, which
20
ingredients are discharged into the duct 190. The feed
includes gate means iadjustably partially traversing said
lateral opening for controlling movement of particles
screw 232 carries a sprocket 236 ?xed on a rear extension
thereof, which sprocket is driven by a chain 238 extend
ing from another sprocket, not shown, on another output
shaft 240 of the variable speed reducer unit 226.
through said opening and back to the inlet.
3. A pulverizing apparatus of the type described com
prising means providing a substantially cylindrical milling
As mentioned hereinabove, larger and heavier particles 25 chamber having an inlet adjacent one end and an axial
of the material being pulverized and passing through the
outlet at its outer end, duct means -for supplying material
milling chamber tend to gravitate under the in?uence of
to be pulverized to said inlet, rotor means supported for
centrifugal force toward the outer periphery of the mill
rotation in said chamber means for pulverizing material
ing chamber. -In order to obtain a ?nished product hav
entering the inlet and imparting circular motion to the
ing a more uniform and relatively small particle size,
material so that larger particles thereof gravitate toward
these larger particles are recirculated through the milling
the periphery of said chamber ‘means, said rotor means
chamber. In accordance with another feature of the
including a perforated mill plate, means providing a lat
present invention, the apparatus is provided with means
eral opening in said chamber means upstream from said
for accomplishing recirculating of the larger particles
axial outlet and adjacent said mill plate for receiving
which means is relatively simple. More speci?cally, a 35 pulverized
particles gravitating toward the periphery of
circumferentially elongated slot 250 is provided in the
cylindrical housing 132 in radial alignment with the mill
said chamber means, baflie means mounted adjacent said
lateral opening and projecting into said milling chamber
adjacent said mill plate for directing particles through
plate 128. A conduit member 252 is mounted on the
cylindrical housing 32 and provides a passageway 254
said lateral opening, and passageway means continuously
providing open communication between said lateral open
ing and said duct means for directing particles entering
said lateral opening back to the inlet.
4. A pulverizing ‘apparatus, as de?ned in claim 3,
wherein said ba?le means includes portions overlapping
a marginal portion of said mill plate and extending along
opposite sides of said ‘mill plate.
5. A pulverizing apparatus, as de?ned in claim 4,
communicating with the slot 250 and also communicating
with the duct means v190.
It is to be noted that the con
struction is such that the larger or heavier particles forced
radially by the mill plate 128 will be projected into the
passageway 254, and the air or gas pressure at the open
ing 250 will be greater than the pressure in the duct
means 11-19 so that ?uid will circulate back to the duct 190
through the passageway 254 and carry the particles which
have entered the passageway back to the duct means. In
order to control the rate of ?uid flow back through the
wherein said baf?e means extends ‘from a plate member
passageway 254, adjustable gate means is provided for 50 adjustably partially traversing ‘said lateral opening, said
bafiie means and said plate member combining to provide
controlling the effective size of the slot or opening 250 as
a gate for controlling the effective size of said lateral open
mg.
extending into the passageway 254 between opposed sur
6. A pulverizing apparatus as de?ned in claim 1, where—
faces of the member 252 and the cylindrical housing 32,
in
said passageway means curves upwardly from said
55
which plate has an elongated slot 258 for accommodating
lateral opening and then immediately downwardly toward
a screw 260. It will be appreciated that the plate 256
said inlet.
may be adjusted left or right as viewed in FIG. 10 when
7. A pulverizing apparatus, as de?ned in claim 1,
the screw 260 is loosened, and the plate will be retained
wherein said means providing the milling chamber in
in any adjusted position when the screw is tightened.
The plate member 256 has an inner end portion 262 60 cludes a generally conical section tapering from adjacent
said lateral opening substantially to said axial outlet, and
which is inclined radially inwardly of and against the
said rotor means includes a shaft extending substantially
direction of rotation of the mill plate 128 and is bifur
through said milling chamber and through said axial out
cated so as to embrace a peripheral marginal portion of
let and blade means on said shaft outwardly of said outlet
the mill plate, see FIG. 3. The inclined plate portion
for
pulling air and the like along with pulverized mate—
65
262 thus acts as a ba?ie for de?ecting the larger particles
rial through said chamber means and said axial outlet.
through the opening 250 and into the passageway 254-.
A shield member 264 is pivotally connected to the in
References Cited in the ?le of this patent
shown in FIG. 10. This gate means includes a plate 256
clined plate portion 262 as at 266 and extends into a
guide slot 268 in the cylindrical member 32 for prevent
ing the pulverized material from clogging the space be
hind the depending batlle portion 262.
70'
While the preferred embodiment of the present inven
tion has been shown and described herein, it is obvious
that many structural details may be changed without de 75
UNITED STATES PATENTS
436,370
580,909
Morgan ______________ __ Sept. 16, 1890
Storer et al. _________ __ Apr. 20, 1897
619,354
S'chutz ______________ __ Feb. 14, 1899
811,671
Simpson _____________ __ Feb. 6, 1906
(Other references on foliowing page)
3,082,962
8
7
2,060,408‘
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850,988
1,198,597
1,519,241
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Williams Q ____________ __ Apr. 23, 1907
Sturtevant ____________ _._ Sept. 19, 1916 9
Daniel ______________ __ Dec. 16, 1924 ,
Arnold ______________ __ May 19, 1925
Witz 2 _______________ __ Mar. 22, 1927
Shepheard ___________ __ Feb. 21, 1928
Ruprecht et ‘,al _________ __ Apr. 30, 1929
McAliistar ___________ __ Aug. 20, 1929 1
Taylor _______________ __ Aug. 20, 1929
Hitchcock ___________ __ Jan. 21, 1930
O’Neill ______________ __ June 17, 1930
Crites ______________ __ July 22, 1930
'
2,313,956 ,
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Wood _______________ __
McGrane ____________ __
Arnold ______________ __
Agthe __,_ ____________ __
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Pollman _____________ __ Apr. 15, 1958
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Andreas _____________ __ June 23, 1959
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Great Britain __________ __ Feb. 14, 1899
_ 2,830,771
FOREIGN PATENTS
' 27,162
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Great Britain ______________ __ of 1913
Switzerland __________ __ Dec. 16, 1925
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