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Патент USA US2279639

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April 14, 1942.
‘M. L. RAHNER
_
2,279,639
END LINER FOR GRINDING MILLS
‘Filed April 10, 1959
2 Sheets-Sheet 1
INVENTOR.
m4.
MAXWELL ‘L. RAHNER.‘
BY
Q
ATTORNEY.
'
April 14, 1942.
2,279,639
M. L. RAHNER‘
END LINER‘FOR GRINDING MILLS
Filed April 10, 1939
2 Sheets-Sheet 2
'INV‘ENTOR.
.
AXWELL LAHNER
MAJ‘, ‘‘
r}
ATTORNEY‘.
2,279,639‘?
Patented Apr. 14, 1942
UNlTED STATES PATENT‘ OFFICE}
END LINER FOR GRINDING
M
Maxweli'ln Raliner, Hi'ghl'amiil’a-rk;
Application-April 10, 1939; 'Serial'No. 267,112.
5 Claims: I (Cl; 83-9)‘
A further; obiect is: to provide endrliner quad-,
rant's: in: association with; an: insert having; par
allel side portionstoa?ord- ready removal-.‘there
This invention relates; to‘ grinding mills and
more particularly to‘ improved‘; end: liners-there.
for, although. certain features thereof. may be
employed with equal advantage: for other; pur
poses.
of ‘ and; provide.v space. to. separate,- the’ remaining
. quadrants'or. radial; sectors. I
It contemplates: more especially the: provision
of improved end'liners. for grinding-millsto: en
able the removal» thereof withminimum> expen
diture of time: and eifort, thereby‘ permitting
speedy and unhampered‘ access to the working
mechanism and interior of? the.- grindingv millzfor
interior reconditioning:v and replacement-rot parts
Astill further object. is; to provide end liner
quadrants‘ of; standard-i shape in conjunctionwith
a:speciaLsectionshaped to afford thev ready; de
tachment thereof; without, appreciably; increas
ing. the expense‘. of; constructiongand substantially
increasing; the removabilityr of: the interior parts
thereof;
_
Numerous types. of grinding mill, liners. have
been proposed and for the most; part these are
formed from east material or’ rolled plates~‘inter-.
Still a» furtherobiectis to provide aplurality
0tv endliner sections complemental to~each other
and=an insert havinggthe; side edges or‘ portions
thereof disposed-parallel.- to-each other for per
posed» with lifting members and - anchoring: expe
mitting the ready removal thereof so that the
dients therefon These.- liners and lifting: ele
ments are subjected to severe; wear and? require
remaining quadrants are readily detachable.
Other objects and advantages will appear from
such asliners;v or: even .the end? liners;
frequent: replacement. Accessibility to- the- inte 20 the following‘ description of an illustrative em
bodiment of thepresent invention;
rior of the grinding mill is, therefore; an'impor
In the, drawings-z
,
tant considerationv and, should: be accomplished
Figure 1 is a perspective. sectional View of a
with minimum; effort and without: entailing: too
grinding mill showing a portion, of its. interior
much time. It has been found that the provision
looking toward the.- feeding-end- or openv trun
of readilyv removable end liner plates solves the
nion, the, end. liner seotionsbeing shaped.’ to em
problem of rendering’ the interior of grinding
body teachings of the present invention.
mills accessible from the standpoint of.‘ simplify:
Figure 2. is: av perspective view of an endveplate
ing; housing; liner replacement.’
and open mounting trunnion looking from the
With the teachings. of the present invention;
the end liner plates are so arranged and con. I19 interior and showing end linersin- operative re
lation therewith, certain of. the end- liner ‘sec
structed as to - afford speedy detachment thereof
tions being shaped to embo.dyffeatures_- of the
without. entailing the usual! time, labor andeffort
present . invention.
.
required with the end» liner. sector plates of quad‘
Figure. v3 isa fragmentary sectional: view'taken
rant shapes: While- expedients to; render end
liner‘ quadrantsv readily removable have.- heretd- .
fore been proposed, such. have not. ‘been, adopted '
with, any degree of. success because they: appre
ciablyenhance the cost of end'liners‘.» and‘. require
loosely associated end~ liner sections vthatfare not
entirely satisfactory.
'
'
One object of the present invention‘ is.- tosim
plify the construction and improve. end liner sec
tions. designed to render- such more readilywree
movable.
-
~
Another object is: to provide, end liner grind is.
ing mill segments. of. standard; shapes witha. sine
substantially along‘ line_-III—III of Figure 1'.
Figure. 4. is a. perspectiveview of an. end liner
insertembodying features-of the present inven
tion and shown inassembled relation in Figure 2.
Figure 5. is a fragmentary. perspective View
similar to Figure 2 and‘ showing; modi?ed end
liner sections. embodying: features of the presen
invention.
‘
.
Figure 6; ispa fragmentary perspective view ‘of
aspecialend-.linerv insert shown in assembled re
lation:in Figure 5;
,
Figure‘ 7 is a fragmentary perspective; view of
an end liner auxiliary insert constituting'a com.
gle intermediaryv section’ of special" construction
to. a?ord the, ready removal thereof for gaining
plement of' the insert shown in Figurea?. . '
accesstothe interior of grinding‘. mills.
Figure 8 is a fragmentary perspective View
Still. anotherbbject. is. tov provide grinding mill 50 similar to Figure 2*and? showing a still further
end liners of substantially standard shapes for
modi?edv end liner: sections embodying features
association with a special and liner segment that
of‘ the present ‘invention.
is. readily removable to- permit, remaining sec
Figure 9'is- arfragmentary- perspective view of'
tions, to i be. detached without entailing much
theqspecial, end linercasingshown in‘ assembled
time. labor or expense;
relation in Figurez?g‘
:
"
'
-
2
‘2,279,639
Figure 10 is a fragmentary sectional view of
ripheral edges 32 of the shell Ill to receive sub—
a corner section of a grinding mill showing the
internal liner in its relation with an end liner
stantially circular end shell heads 36. The cir
cumferential edge region of the heads 36 are
section of the type shown in Figure 9.
provided with a plurality of circumferentially
The structure selected for illustration com
spaced apertures 31 that are in aligned registry
prises a substantially cylindrical shell III of a
with corresponding apertures 38 provided in the
conventional grinding mill. The shell I6, in
peripheral ?ange 34 of the shell I6, to receive
ths instance, has its interior lined with a plu
fastener bolts 39 therethrough.
rality of detachably associated ?at steel rec
The fastener bolts 39 are provided with
tangular plates II. The substantially ?at rec 10 threaded nuts 46 that serve to securely attach
tangular plates H extend for any desired length
the end shell heads 36 to the shell I6. As shown,
and width, and merely comprise a component
the intake end head 36 is provided with an axial
part of the sectional liner that extends longi
trunnion M, in this instance formed integral
tudihally for the length of the grinding mill
therewith, to serve as a housing mount. To this
shell II). To this end, the substantially ?at liner 15 end, the trunnion 4| is provided with an an
plates II extend longitudinally of~~each other
nular groove 42 that cooperates with correspond~
so that their ends I2-—I3 are in adjacent con~
ingly sized and shaped bearings associated with
tact (Figure 3) and the number depend upon
standards on suitable bearing brackets for jour
the requirements of handling and the length of
nalled support of the shell I6 through the medi
the particular grinding mill shell I6 together
um of their end trunnions 4!. The intake trun
with the most e?icient unit size thereof.
nion M is provided with an enlarged axial bore
A plurality of frusto-conical apertures I4, in
43 through which the shell I U is charged with the
this instance two, are provided along a longi
desired articles to be ?nished therein.
tudinal median line of each plate II to receive
The tubular trunnion M is sized so that the‘
anchoring fasteners such as threaded bolts I6 25 attendant can have access to the interior of the
having correspondingly shaped and sized heads
shell I0 therethrough for the purpose of manip
I]. The frusto-conical heads H of the threaded
ulating a plurality of end liner plates 44 attached
fastener bolts I6 and the apertures I4 are pref
to the interior surface of the circular shell end
erably provided with complemental inter-engag
head plate 36. To this end, the end liner plates
ing means more particularly illustrated and de 30 44 or plurality of sectors have their inclined
scribed in my copending application serially
side, edges 45 and 46 disposed along the radii
numbered 256,679 and ?led February 16, 1939,
of the end head or mounting plate 36 to de?ne
thereby precluding the fasteners I6 from turn
complemental sectors 44. The complemental
ing as their nuts H are turned down tight
sectors 44 are sized in a sufficient number to
against the shell I0 with the fastener shank I6 35 cover the entire exposed interior surface of the
projecting through suitable apertures 22 there
trunnion plate or head 36.
in.
Because the converging sides 45 and 46 of
The width of the plates and the number there
the sectors 44 do not permit ready tilting or
of that are circumferentially spaced around the
linear displacement of one relative to the other
internal periphery of the shell depends upon 40 in the direction of the axis of the shell I6 and
the diameter thereof and the size of the lifting
trunnion M to permit their removal for replace
elements 23 disposed therebetween. The lifting
ment purposes, it has been found desirable to
elements 23 preferably though not essentially
interpose therebetween an insert plate 4‘! hav
consist of standard rails having side channels
ing parallel sides 48 and 49 preferably though
24 and 25 that de?ne the rail head 26 and a 45 not essentially extending for the entire border
substantially wider base flange 21, a cross section
between the bore 43 and the truunion M and the
thereof being of standard and conventional de
internal diameter of the shell II] to render such
sign with the channels 24-'—25 serving to receive
the side edges 28 and 29 of the liner plates II
disposed therebetween to de?ne a continuous
liner comprising the plates II and the inter
mediary lifting elements 23.
Turning the nuts 2| down tight exteriorly
of the shell in will serve to retain the lifting
readily movable by permitting the tiltable dis
placement thereof relative to its parallel edges
48-49.
In consequence thereof, the next adjacent sec
tors v5%‘! and 5I are shaped to serve as comple
ments of the insert end liner plate 4'! to the end
that their confronting edges Hand 53 are dis
elements 23 in a predetermined assembled rela 55 posed parallel to the radial mediun line of the
tion therewith for turning with the shell I6.
insert 41 so that the end liner plates 4'I-50—5I
With this arrangement, the lifting elements 23
are complements of each other with their outside
are secured indirectly by the liner plates I I, and
edges 54 and 55 conforming to and disposed along
this affords the convenient replacement of either
the radii to correspond with the converging sides
or both elements II—23 comprising the internal 60 45-46 of the next adjacent standard end liner
liner of the shell I0. It should be observed that
sectors 44.
the lower longitudinal corners 33 and 3| of the
It will be apparent, therefore, that the end
liner plates II will engage the base 21 so as to
liner insert 41 can be tilted or displaced radially
effectively grip the base 21 therebetween to avoid
toward the center of the trunnion 4| by the ap
the minutely ground materials con?ned interi 65 plication of manual force through the bore 43
orly of the liners II—23 to ?nd their way to the
therein. After the end liner insert-41 has been
shell I0, thereby avoiding appreciable wear and
removed in this manner, there is su?icient space
injury thereto over long periods of operating
available to circumferentially displace the re
use.
maining end liner sectors 44—50—5I so that they
It will be observed that the shell I6 has its
can be removed in their entirety for replacement
peripheral end regions 32 provided with a rein
after being excessively worn responsive to the
forcing collar 33 thatis welded or otherwise
extended use thereof. ,
joined thereto to present an upstanding periph
It is to be noted that the end liner sectors
eral flange 34. The ?nished ?at surface 35 of
44—4‘I—50-5I are attached to the end head or
the collar ?ange 34 is in alignment‘ with the pe 75 trunnion supporting plate 36 by means of thread
23279§63Q3
ed~ bolts 5e and? 51; in thi’siinst'ance’two, that
project" through‘- aligned! apertures: 58;-"-59‘ pro-s
and‘: 6-1' are presented by? cutting off the: outer‘ '
cornerszof‘ one“ of the‘end liner sectors: 44:".
'lfheireino‘val of the'iouter corner-s1 presented by‘
vided; inle'a'chi of' the end liner'» sectors 44 includi
ing the? liner'insert 41' and the; complemental
adjaeent'liner sectors 50'—5|.» The fastener bolts
the comparatively‘ shortf parallel: sides-52 ’ ' '-53 ' " '
(Figure 9) in-conj'uncti'on with. the bevelled outer
edge: 65’ will: permit thepivoting of. the- insert‘
liner: sectors 44"’ along:- the,‘v parallel edge por
56-51'prefer'ably have" tapered heads 60 seated
' in» correspondingly shaped apertures 58‘—59, in
this instance; two, provided in the end liner sec
tors‘ 4'4‘—-4v'!‘—56'—5l‘. The‘ bolt shanks project
tions 52"’—53"' thereof’ to: assume a position
shown in dotted outline" inzFigure 10. The bev
through corresponding aligned apertures 59 in 10 elled." outer circumferential surface‘ 65' provides‘
the end head or trunnion supporting plate: 36 to
'clearance‘relativelto the, internal surface of the
receive fasteners such as‘ threadednuts 6| that
shell head or" trunnion supporting. plate 36". It
are" exteriorly accessible for securing. the end
will be appreciated, therefore, that after the-end
liners‘. 44--41-50—-5| in, position and. permit
liner sectors: 44"’ with; its.- parallel outer edges
their removal.
‘
15 Elm-53"” have: been‘wpivoted to a position af
It will be apparent,therefore, that the standard
fordingv clearance for the» comparatively longer
eridiliner sectors 44 are‘rendered readily remov
converging radial edge portions 45" andv 46"
able without entailing any appreciable’time, labor
thereof, the insert segments 44" can- be dis
or expensebyprovidingpa.parallel side therebe
placed inwardly in the direction of the axis of
tween together with complemental sectors 5ll—5l
the shell ID to effect its complete removal.
adjacent thereto. It isworthy of note-that the
The remaining liner'sectors 44" are of standard
inner and outer radial ends 63 and 3 of the end
design conforming to the end liner' segments or
liner sectors 44—41—-5?—5l are of arcuate con
sectors“ (Figure l) and 44’ (Figure-5). This
?guration to conform with the circumference of
construction avoids necessity of, having special
theitrunnion bore 43 and the interior diameter
complemental liner sectors adjacent to-the spec
of the shell I 0;- respectively, so that they will serve
iallyi constructed insert-41" (Figure 9): and still
to cover‘ and provide a full liner for the interior
surface of the shell head or trunnion support
ing plate 36.
In- the modi?ed'rembodiment shown inFigures
5¢~to '7 inclusive, the parts and shapes of the mem
bers are substantially identical with those de
scribed-in the preferred embodiment. However,
the» end liner insert 41' has parallel sides 48’ and
59’ for aisubstantial portion of its length. The »
provides the desired; tiltable freedom for ready
removal comparing favorably with the, shapesof
theinserts >41 (Figures-l to 4) and 41’ (Figures
3O
5
and 6).
'
'
Withthe teachings- of the invention described
herein, it will be apparent thata very‘simple' end
liner expedient has been.» provided to‘ permit the
ready removal thereof for replacement and- to
provide space adjacent the heads 36' so that the
parallel sides 48'—-49' merge with converging
shell liners H can also be replaced with ease
substantially radial edge portions 48" and 49"
and» without‘ entailing; extended time and labor
to constitute complements of correspondingly
heretofore required to perform these operations.
sized and shaped adjacent edges 52’—52" and
Various changes may» be made‘ in- the embodi
5'3"'—5 3'i "provided oncomplemental end liner sec 40 ment of the invention herein’ speci?cally de
tors 50"'and 5|’. The end liner sectors 50'—5l'
that are adjacent to the insert 41’ have. their
scribed without departing from the invention or
sacri?cing‘ any of the advantages or features
edges 5'2»’-53f shaped to correspond with the ad
thereof; and nothingher'ein shall be'construed as
jacent‘ edges 4’8'--48i" and-4‘9'—49"’ so that in the
limitations upon the invention, its concept’ or
removal of the end liner insert 41', it is tilted'to 45 structural embodiment as to the whole or any
permit the‘ converging side portions 48"—49’ to
be displaced from adjacent alignment with the
complemental end liner sectors 50'—5I' to vper
mit' withdrawal or displacement thereof toward
part thereof except as'de?ned in, the' appended
claims.’
'
,
'
I. In a grinding mill, the combination'with a
the center along the parallel edge portions 60 cylindrical’
housing, of‘v end head members de-‘
52'-53’.
tachably connected‘to said housing, means-pro
To afford the tilting of the end liner insert 41’
along a su?icient arc to effect the total displace
ment of the converging edge portions 48"--49”
thereof, a circumferential outer edge 64 of the
end liner insert 41' is arcuately curved or bev
elled as at 65 to provide the necessary clearance
during the tilting displacement thereof to avoid
jecting from" said‘ end head members to-rota
tively support said housing, non-tiltable comple
mental edge contacting end liner sectors detach
ably associated with the interior surface of said
end head members to de?ne a continuous liner
surface, a tiltable liner insert between two end
liner sectors and having parallel edges extend
contact or abut with the interior surface of the
ing for the entire length thereof, and non-tiltable
circular head or trunnion supporting plate 36 60 liner sectors adjacent said tiltable liner insert and
(Figure 10).
In a further modi?ed embodiment shown in
non-tiltable end liner sectors, said adjacent non
tiltable liner sectors having edges complemental -
Figures 8 to 10, one of the standard liner sectors
to the edges of said non-tiltable liner sectors and
44" is cut off proximate to their circumferential
said tiltable liner insert for facilitating liner re- '
outer ends 64’ to provide short parallel sides 52'” 65
and 53"’ that are shorter or no greater in length
than the shortest distance between the interior
of the shell 10 and its confronting liner plates ll
moval.
2'. In a grinding mill, the combination with a
cylindrical housing; of a head closing an end
thereof; means projecting from said end head to
(Figure 1). Consequently, the dust and pulver 70 rotatively support said housing; a plurality of .
complementary shaped end liner sectors extend
ing the grinding thereof responsive to the rota
ing radially between said housing and said sup
tion of the shell II), will not become packed be
porting means and disposed in intimate edgev
ized substances removed from the articles dur
tween the shell l0 and its liner plates ll, even
contact with each other; a tiltable liner insert
though comparatively small corner openings 66 75 member interposed between adjacent sectors and
2,279,639.
in edgecontact therewith, the side edges of said
tiltable insert member ‘and the ‘proximate edges
of said adjacent sectors having parallel portions,
spacedfrom each‘other (a substantial distance
tilted‘ upon an 'end edge as a fulcrum, said sec
throughout their lengths; a‘ tiltable liner insert
member interposed between said spaced sectors
in edge contact; therewith, theside edges of said
tiltable insert member and the proximate edges
tors and said insert member being of correspond
ing full length commensurate with the effective
of said spaced sectors having parallel portions,
whereby said insert member is adapted to be
whereby ' said insertmember -- is adapted to be
tiltedupon an vend edge as a fulcrum, said sectors
radii of said end enclosing head to de?ne a con
and said insert member being of corresponding
tinuous imperforate and unbroken end liner sur
face enclosure for ‘said head to preclude the en 10 full length commensurate With the effective radii
of said: end enclosing head to de?ne a continuous
trance of substances therebetween, said sectors
imperforate and unbrokenend liner surface en
and ‘said insert member being incapable of radial
closure for said head to preclude the entrance of
movement prior to .tilting said liner insert for
substances therebetween, said sectors and said
removal thereof and» adjacent sectors; and means
detachably anchoring said plurality of sectors 15 insert member being incapable of. radial move
ment prior to tilting said liner insert for removal
and said insert member in the positions named.
thereof and adjacent sectors; and means detach
3. In a grinding mill, the combination with a
ably anchoring ‘said plurality of sectors and said
cylindrical housing; of a head closing an end
insert‘member; in the positions named.
thereof; means projecting from said end head to
5. In a grinding mill, the combination with a
rotatively support said housing; a, plurality of
cylindrical housing; of a head closing an end
complementary shaped end liner sectors extend
thereof; means projecting from said end head to
ing radially between said‘housing and said sup
rotatively support said housing; a plurality of
porting means and disposed in intimate edge
complementary shaped end liner sectors extend
contact with each other; a tiltable liner insert
member having substantial width interposed be- ' ing radially between said housing and said sup
porting means and disposed in intimate edge
tween adjacent spaced sectors and in edge con
contact with each other; a pair of said sectors
tact therewith throughout their lengths, the side
spaced from each other a substantial distance
edges of said tiltable insert member and the prox
throughout their lengths; a tiltable liner insert
imate edges of said adjacent sectors having par
allel portions extending inward fromtheir re 30 member having substantial width interposed be
tween ’said spaced sectors in edge contact there
spective outer ends, whereby said insert member
with‘ throughout their lengths, the side edges of
is adapted to be tilted upon an end edge as a ful
said tiltable insert member and the proximate
crum, said sectors and said insert member being
edges of said spaced'sectors having parallel por
of corresponding full length commensurate with
tions extending inward from their respective
the effective radii of said end enclosing head to
outer ends, the outer edge of said insert member
define a continuous imperforate and unbroken
provided with a bevelwhereby said insert mem
end liner surface enclosure for said head to pre
ber is_ adapted to be tilted upon its outer edge as
clude the entrance of substances therebetween,
a fulcrum, said sectors and said insert member
said sectors and said insert member being in
capable of radial movement prior to tilting said 40 being of corresponding full length commensurate
liner insert for removal thereof and adjacent sec
tors; and means detachably anchoring said plu
rality of sectors and said insert member in the
positions named.
4. In a grinding mill, the combination with a
cylindrical housing; of a head closing an end
thereof; means projecting from said end head to
rotatively support said housing; a plurality of
complementary shaped end liner sectors extend
ing radially between said housing and said sup- '
porting means and disposed in intimate edge
contact with each other; a pair of said sectors
with the effective radii of said end enclosing head
to de?ne a continuous imperforate and unbroken
end liner surface enclosure ‘for said head to pre
:lude thev entrance of‘ substance therebetween,
said sectors and said insert member being in
capable‘ of radial movement prior to tilting said
liner insert for removal thereof andadjacent sec
tors; and means detachablyanchoring said plu
rality of sectors and said insert member in the
positions named.
MAXWELL L. RAHNER.
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