Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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The present invention concerns a milling or ~rinding
devlce havlng a statlonary grinding disc and a rotatable
grinding disc coaxial to the stationary disc, said two
grinding discs having milling or grinding surfaces.
Wlth the term grindlng device is herein meant also such
device~ known a~ reflners and defibrators.
The object of the pre~ent lnvention i~ to provlde a
mllllng or grlndlng devlce o the above stated klnd, whlch
1~ ~ultable for qrlndlng (dl~aggregating) Yarious materlals,
both flbrou~ materlals, such as wood chlps, and other mate-
rlal~, ~uch a~ coffee and graln.
Another object of the lnventlon i8 to provide a grinding
devlce offering po~sibllities, during operation, to influence
the pattern of movement of the material to be ground as well
a~ lt~ tlme of treatment wlthln the devlce, ln order there-
by to lmpart to the materlal a more homogenou~ slze.
The~e ob~ect~ have been achleved ln that the grlndlng
~urface of the statlonary grlndlng dl w comprl~e~ a ~tandlng
maln portlon and a plurality of portlons belng excentrically
let lnto the maln portlon and belng separately drlveable ln
~electlve dlrectlon~ of rotatlon.
The ldea of the lnventlon, thus, 1~ to provlde two gene-
rally even grlnding ~urface~, of whlch the ~tandlng one for
lmpro~ement of the grlndlng capablllty ha~ been dlvld-d ln one
~tlll ~tatlonary portlon and ~everal ~eparately movable por-
tlon~.
An o~bodlm4nt of the lnventlon wlll now be deJcrlbed,
r-f-rence b lng made to the accompanylng drawlng~, whereln
flga la and lb ~how a grlndlng devlce accordlng to th- ln-
v-ntlon, flg. la ~howlng a rotatabl- grlndlng dl~c ~lth
drlvlng mean~ and flg. lb showlng the corre~pondlng ~tatlo-
nary grlndlng dl~c havlng a plurallty o~ ~eparately drlve-
able grlndlng rurface portlon~ let lnto the ~tandlng maln
grlndlng ~urface thereof. Flg. 2 ~how~ a part axlal Jectlo-
nal vle~ through a grlndlng devlce according to the lnven-
tlon. Flg~ 3 and 4 ~how two dlfferent embodiment~ of the
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~eparately driveable grinding surface~ respectively Figs
5-8 lntend to clarify the functlon of the device flg 5 ln
a perspective view showing the relative movement between
a rotatable grinding disc and separately driYeable portions
of a stationary grinding disc fig 6 ahowing an axial sec-
tion through the device of fig S flg 7 showlng in a per-
spectlve vieW a portion of a rotatable grlnding di~c and
a eparately drlueable portion of a ~tatlonary grinding di~c,
whlch latter, for the sake of Yi~uallzation~ 18 ~hown belng
tran~parent thereby making a fibre fa~cicle or bundle vi~lble
and flg 8 at a larger scale showing the fibre fa~cicle of
fig 7
The devlce ~hown ln flg~ la and lb comprises a conventio-
nal dri~lng apparatu~ 10 for drlving a rotatable annular
grlndlng dlac ll ~his latter comprlse~ a plurality of ring-
~ector ~haped grinding means 13 att~ched to a wheel 12 The
whoel 12 has a central substantially frusto-conical portion
14, whlch 18 provldod wlth screw-llned feedlng rlb~ 15 Tho
whecl 12 1~ aaapted to rotate wlthln a houslng 16 havlng an
outlet 17 and belng divlded ln a flr~t part 18 and a second
part 19 The two part~ 18 and 19 have cooperatlng flanges
20 and 21 re~pectlvely and corre~pondlng bore~ 22 and 23,
respectlvely, ~o that the houslng parts can tlghtly be
~olnted to a unlty (flg 2J
The ~econd houJlng part 19 ha~ a rece~ 24 for the frw to-
¢onlcal portlon 1~ o~ the whe-l 12 The rece~ 24 al~o ha~
~cre~-llned fe-dlng rlb~ 25 The rec-~J 24, whlch run~ lnto
a cyllndrlaal conn-ctlon portlon 26 for a ~eedlng tubc, wlth
lt~ f-~dlng rlb- 25 together wlth tho fru~to-conlcal por-
tion 14 ant lt~ fe~dlng rlb~ 15 form a feedlng moa~ havlng
an annular pa~age of dimlnlshlng ~ldth from the cyllndrlcal
portlon 26 tow~rd~ the hou~lng 16 In thls pa~ago an lnltlal
dl~aggr~gatlon of mat-rlal fed take~ place
Oppo~lto to the rotatabl- grlndlng di~c 11 of the houslng
part 18 the hou~lng part 19 1~ provlded wlth an annular
grlndlng dl~c 27, whlch 18 co-axlal to the grlndlng dlsc 11
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and also comprises a plurality of ring-sector shaped grind-
lng means 28, that in a suitable way are secured to the
hou~lng part 19
Up to now the devlce de~crlbed in all essentlal corre-
S ~ponds to a conventional grlndlng device or refiner
In the grlndlng devlce according to the present inven-
tlon, however, the grlndlng surface of the statlonary grlnd-
lng dl~c 1~ provlded wlth one or preferably a plurality of
lndlvidualIy rotatable grinding surface portions ~n prac-
tlce, this is accompllshed by rotatable grinding di~cs 29,whlch are planetarlly dl~poQed in relation to the grindlng
dl~c 11 and are let into the surface thereof The grinding
dlsc~ 29 wlll herelnafter be referred to as "planet dlscs",
wherea~, ln analogy therewlth, the rotatable dl~c 11 wlll
lS be referred to a~ ~sun dl~c~ and the ~tatlonary dl~c 27 a
~corona dl~c~
In the embod~ment of the lnventlon shown in flg lb all
planet dlsc~ 29 are located with thelr axe~ of rotation
equally dlstrlbuted along one and the same clrcle It would,
of cour~e, al~o be po~slble to arrange the planet dl~cs at
dlfferont radlnl level~ relatlve to the center of the sun
and corona dl~c~
In the ombodlmont ~hown a planet dl~c 29 1~ let lnto each
grlndlng mean~ 28 Alternatlvely a planet dl~c may be let
lnto o g only evory ~econd grlndlng mean~ 28
A~ appear~ e~peclally from flg 2 a planet dl~c 29 18
let into a clrcular roce~J 30 ln a grlndlng moan~ 28 of the
hou~lng part 19 and 1J rotatably ~upported by a ~haft 31
that extend~ through th hou~lng part 19 The ~haft 31 1
drlvlngly connoct~a to a motor 32
Por ~xlal ad~u~tment of the grlndlng ~urface of the pla-
net dl~c 29 relatl~e to the maln portlon of the grindlng
surf~ce of the corona d~c 27, the motor 32, ~y mean~ of a
flange integral therewlth, 18 attached to a flanged ~leeve
33 h~vlng outer ~crew thread~ cooperatlng wlth corre~pondlng
inner wrew thread~ of a rlng portlon 34 protrudlng from the
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housing part lg
~ y turning the sleeve 33 relative to the housing part
19, thus, the planet disc 29 can be axially displaced for
adjustment relative to the grinding means 28 of the corona
S di~c 27
The shaft 31 is journalled in the sleeYe 33 by means of
bearl~gs 35 and i~ sealed towards the houslng part 19 by
means of ~eallng 36
For facllltated mountlng, malnten~nce etc , each planet
dl~c unit, l e planet dlsc, drlve motor, shaft etc , ls
~ultably detachable a~ a unlt from the hou~lng part 19 In
the example ~hown thl~ ha~ been accomplished by di~posing
the ~haft 31 and the ~leeve 33 in a cover 38, which is let
into the hou~lng part lg and secured thereto by means of
~crew~ 37
Por ad~u~tment of the grindlng ~oad the ~un di~c ll i~
axlally ad~u~table by lt~ ~haft 39, a~ 1~ known ln the art
Tho operatlon of the devlce wlll now be descrlbed wlth
re~-rence to 1g~ 5-8 In a known manner the materlal to be
ground i8 centrally lntroduced ln the devlce and 1~ exposed
to an lnltial dl~sggregation treatment ln the dlm~nlJhlng
pa-sage between the fru~to-conlcal portlon 14 of the wheel
12 and the rece~ 24 of tho hou~lng p~rt l9 Thereafter tho
materlal reache~ the ~pace betw-en the grlndlng meanJ 13 of
th- rotatlng aun dlJc ll and the grlndlng ~oan~ 28 of tho
~tatlonary corona dl~c 27, ln whlch latter are let ln plan-t
~l~o~ 29 whlch ar- ~o ad~u-t-d that thelr grlndlng ~urface~
~lu~h wlth th- grlndlng ~urf~co of the corona dl~c 27 In
ca-- o~ ~tlll tandlng planet dl~c~ 29 the treatm nt b tween
tho un dl-c and ths corona dl~c would be ~ub~tantlally con-
ventlonal, but lf tho planet dl~c~ arrang-d accordIng to tho
lnvontlon are put lnto rotatlon, the materlal to b- ground
wlll bo ~xpo~ed to a twl-tlng mov-~ont, that on flbrou~ ma-
torlals provldo- an un-~plnnlng actlon and on other materl~l~
a twl~t-cru-hing~ action AJ an ex~mple there 1~ ~hown ln
flg 7 and at a larger Jcale in flg 8 how a fa~clcle of
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fibre~ 40 is twisted and torn under the influence of the two
directions of movement when the sun disc 11 and the planet
disc 29 are rotated in opposite directions (arrows 41 and 42,
respectlvely). In the posltlon shown, the far portion of the
S fa~cicle shown partly hidden in fig. 8 is in contact with
the grinding means of the sun disc and, thus, moves to the
rlght of the drawing, while its nearer portion, relatively
~een, move~ to the left, but above all downward~ due to the
contact with the portion of the planet disc 29 in this posi-
tion moving downwards in fig. 7.
When the sun disc and the planet disc~ rotate in oppo-
~lte dlrection~ (as in fig. 7) the invention brings about
the great advantage that un-fini~hed material, i.e. too big
particles thereof, when encountering a planet disc, wlll be
brought by that planet disc toward~ the center of the sun
and corona dlscs ~downward~ ln fig. 7) for further treatment.
Hereby a highly uniformly treated product will re~ult.
Al~o the materlal wlll notbe more treated than necessary,
whlch in turn re~ults in considerable energy saving~.
Accordlng to the invention the planet dl ~C8 29 can be
driven ln ~electlve dlrectlons o rotatlon ~f~g. 5) relatlve
to the rotatable sun dlsc 11, or ln alternatlng dlrectlon~.
In certaln ca~e~ lt may for lnstance be de~lrable to drlve
overy ~econd planet dlsc ln rlght hand revolutlon and every
~econd ln left hand revolutlon. The revolutlon ~peed may
al~o be lndlvldually varled.
The materlal of the planet dl~c~ and thelr ~urface
structure may be varled d-pendlng on the materlal to be
ground. In certaln ca~e~ a ~urface ~tructure havlng groove~
and protru~ion~ according to fig. 4, l.e. corre~pondlng to
the grlndlng mean~ 28, may be ~uitable. In other case~ pla-
net dlsc~ 29' of grlndstone materlal (f~g. 3) may be prefer-
red.Thi~ latter materlal ha~ the advantage that the planet
dlscs become ~elf-cleanlng.
