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Патент USA US2128468

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iii-tug. 30, 1938.
s, L_ MLL'ER
Filed Sept. 9, 1955
2 Sheets-Sheet i
2 Swen/5L. MALE/e
Aug. 30, 1938.
Filed Sept. 9, 1955
2 Sheets-Sheet 2 I
Patented Aug. 30, 1938
Starks L. Miller, Denver, 0010., assignor to Amer
ican Ball-Mill Company, Denver, 0010.
Application September 9, 1935, Serial No. 39,762
3 Claims.
This‘ invention relates to improvements in
grinding mills of the type employed in grinding
ores and the like, which employ attrition bodies
such as balls or rods. The invention relates more
5 particularly to the construction of the end liners
and the means for securing them in place.
The principal object of this invention is to
provide sectional end liners, throat rings and ball
retainers that are individually removable without
disturbing the other sections.
Another‘object is to provide a simple means
for holding the sections in place and which can
be readily released for the purpose of permitting
the removal of the sections.
A further object is to provide means for secur
ing sectional end liners, ball-retainers and throat
rings in place in a grinding mill by the employ
ment of radially acting forces.
The above and other objects that may appear
20 as ‘the description proceeds are obtained by means
of a construction and an arrangement of parts
that will now be described in detail and for this
purpose reference will be had to the accompany
ing drawings in which the invention has been
illustrated, and in which
Figure 1 is a view, partly in section and partly
in side elevation, showing a grinding mill con
structed in accordance with this invention;
Figure 2 is a section taken on line'2—'2, Figure 1,
looking toward the discharge end of the mill;
Figure 3 is a section taken on line 3-3, Figure
1, looking toward the'intake trunnion or the-feed
end of the mill;
Figure 4 is a View, partly in section'and partly
' in elevation, looking in ‘the direction of arrow 4',
Figure 5;
Figure 7 is a section taken on line 'l—'l; Fig
ure 5;
Figure 8 is a section taken on‘line‘ 8—8, Fig
ure 9; '
Figure 9 is a section taken on‘line 9—9, Fig—
ure 8;
Figure 10 is a section taken on line I il-lli,
Figure 9;
Figure 11 is a section, taken on line 'lZ-IZ,
Figure 12;
the shell are a number of channelled girders I2,
arranged in spaced parallel relation with the web
toward the inside and the edges of the ?anges in
contact with the shell.
Liner sections l3 are 1|)
supported on the girders and held in assembled
and spaced relation by means of curved wedges l4.
Since the invention here relates more particu
larly to the construction of and the method of
securing the end liners, throat ring and discharge '
grate in place the construction of the side liners
will not be further described.
Referring now more particularly to Figures 1,
2 and 3, it will be seen that abutments I5 are
secured to the inner surfaces of the heads. The
abutments may be rings, which are secured in
place by welding or by bolts or rivets, or they
may be formed from a number of separate sec
tions secured in place by similar means.
It will be observed that the inside edges of the L
abutments are beveled so as to provide an under
cut surface, as shown most clearly in Figure‘ 9.
At the inner end of the intake or feed trunnion
8 a sectional throat ring is provided, which‘ con—
sists of a plurality of sections 16. In 'the‘example
illustrated the throat ring is formed from four
sectors each of 90° angular extent. The outer
surface of each sector i6 is provided with an out
wardly facing beveled shoulder which is so posi
tioned that it will engage the inside of the abut- .
ments in the manner shown most clearly in Fig
Figure 5 is a‘ section taken on ‘line 5-—'5, Fig
ure 4;
Figure 6 is .a section ‘taken. on line 6--6, Fig~
nates the shell, numerals 6 and l the headsv at
the intake and the discharge end respectively, and
numerals 8 and 9 designate respectively the in
take and the discharge trunnions. The trun
nions are mounted for rotation in bearings Ill 5
carried on suitable supports ll. Located within
Figure 12 is a section, taken on line H-Ii,
Figure 11;‘
Figure 13 is a section taken on line I3—l3,
Figure 11.
In the drawings referencev numeral 5 desig
ure 9.
The radial surfaces of the sectors [6 are pro
vided with curved tapering grooves for the recep
tion of curved wedges l8 whose wider‘ ends ‘are
toward the inside as shown most clearly in Figure
8. The sectors l6 are of such size that they‘can
be put into position and then moved radially
until the shoulders I? engage the cooperating
beveled shoulders of the abutments.
After the ,
blocks or sectors l6 are properly positioned, the
wedges l8 are inserted and‘ driven home until the
pressure of the shoulders I‘! against the abut
ments is su?icient to hold the sectors in place.
At the inner end of the discharge trunnion 50
9 a sectional ball-retainer is positioned and held
in place by means substantially identical with
that employed with the throat ring. The ball
retainer has been shown as comprising four sec
tor-shaped parts IQ of a transverse ‘section-like 55
that illustrated in Figure 5. Each part I9 has an
outwardly directed shoulder I‘! while adjacent
radial sides have curved tapered grooves for the
reception of the wedges I8. _
From Figures 1, 2 and 3 it will be seen that the
inside of the discharge head ‘I is provided with a
plurality of truncated triangle-shaped liner sec
tions 24, whose shape and the manner of securing
them in place is most clearly shown in Figures 4
10 and 5.
It will be seen from Figure 4 that the end
liner sections are so positioned that the sides lie
in radii bisecting the girders I2 and that their
bases are therefore formed from two
straight sections b and 0.
An elongated wedge 25 is secured transversely
of each girder and serves as an abutment for
the straight end walls b and c of adjacent sec
tions 24. The opposing sides of adjacent sections
are provided with tapering arcuate grooves for the
reception of the curved tapering wedges I8.
In order to enhance the holding function of
keys I8 throughout the maximum period of wear
on the liner sections 24, the heads 5 and ‘I are
provided with pockets 38 as illustrated in Figures
5, '7, 9 and 10. The liner sections 24, 23a and 2%
have ?anges 3|, 3Ia and 3Ib respectively which
extend into the pockets 30 when the keys I8 are
driven into the grooves.
It will be noted in Figure 5 that the keys I8
extend through the grooves to a greater depth
than the normal thickness of the liner sections 24,
indicated by the dotted line.
From the foregoing, it will be apparent that no
matter how thin the end liners wear, there
will be enough of the key IS in the grooves within
the flanges 3i to prevent the sections from sep
to each girder near its end, the base of each liner
section 24d is provided with a curved tapering
groove for the reception of a correspondingly
curved tapered wedge I8b which is positioned
between the lug 26 and the inside of the head.
The wedge I8b is somewhat conical, and the
groove in section 2401 is similarly inclined with
the result that when the wedge is driven home
the resultant force will be along line 0-b- and
tends to force the sections against the inside of 10
the head.
It will be seen from the above description that
the parts are held in place by a radial force which
acts to expand the throat ring, the grate and
the end liners, radially against abutments hav
ing beveled edges, which abutments have been
indicated by numeral I5.
The curved wedges employed for holding the
end liners in place have been designated through
out the several views by numeral I8 as they are all
alike except as to size.
Throughout the claims the words “liners” and
“liner sections” will be employed in a sense broad
enough to include the throat ring and grate sec
tions as well as the other liner sections, as the ~
several kinds of liners are all secured in place in
the same way.
Attention has previously been called to the fact
that the abutments may be rings or a plurality
of separate sections arranged in the form of a 30
circle and therefore whenever the expression “an
nular abutment” or “ring abutment” is used, it is
to be, understood as including the equivalent
Having described the invention, what is claimed
as new is:
readily be removed, thereby completely releasing
1. In a grinding mill, a shell, a head at an end
thereof, an abutment on the head, the abutment
having an undercut shoulder, a girder on the
shell, a lug on the girder spaced from an end 40
thereof, a liner positioned between the girder and
the abutment, the liner having a beveled shoulder
for engaging the undercut shoulder on the abut
ment, there being a groove in the liner, and a
spreader positioned in the groove and engaging
the girder between the lug and the head for
producing a force urging the shoulders into en
the section.
When the sections are positioned as shown in
Figure 4, and separated by the wedges, the end
"I O walls I) and 0 will be forced radially against the
wedges 25 and the end liners will thus be securely
held in place without the use of bolts; the wedge
25 having its inner edges so beveled as to under
cut the adjacent liner. When an end liner section
- is to be removed a wedge at one side is driven out
after which the wedge on the opposite side can
The liners on the inside of head 6 are somewhat
differently formed and are held in place by spe
ci?cially different means, all as will now be de
The liners of head 6 are each formed from two
parts 24a and 2%, which together equal one liner
5.3 24.
The abutment or abutnients Ida have both
the inner and outer edges beveled, in the manner
shown in Figure 9, and the girders have wedges
2. A grinding mill having a shell, a head at an
end thereof, the head having a trunnion, liners
for the head, comprising a central portion formed
from several parts, each part having a portion
extending into the trunnion and another por
tion projecting over the surface of the head im
mediately surrounding the trunnion, an abutment 1
von the head adjacent the trunnion, having its
inner edge undercut, the liners having outwardly
25 secured thereto the same as in Figure 4. The
bottom side of section 24a and the top of section
(10 24b are provided with cooperating curved taper
ing grooves for the reception of a curved wedge
I8 which serves to force the inner end of section
24a against the outer edge of the abutments [5a
and the outer end of section 241) against the
(S5 wedge 25.
In Figures 11, 12 and 13 another way of se
curing the liners in position has been shown. The
abutment I5a has been illustrated as a ring hav
ing both its inner and its outer edges beveled.
facing shoulders inclined to ?t the shoulder on
the abutment, means for expandingthe liner as
sembly to force the shoulders thereof into inter GI)
locking engagement with the shoulder on the
abutment, a second abutment means positioned
- This ring is secured to the head in any suitable
way and instead of being a continuous ring as
locking engagement between the shoulders.
3. A grinding mill having a substantially cylin
drical shell, a head for closing one end thereof,
shown, may be formed from a plurality of seg
Instead of the wedges 25 shown in Figure 9 a
curved or segmental shaped lug 26 is attached
adjacent the periphery of the head, the inner edge
of the outer abutment means being undercut, a
plurality of liners positioned between the two
abutments and provided with outwardly directed
shoulders shaped to engage the undercut shoul
der on the last-mentioned abutment, and means
for expanding the liner assembly to secure inter~
the head having a tubular trunnion, liners for
the inside of the head, the liner comprising a
central portion formed from several sector-shaped 76
parts, each part having a portion extending into
the trunnion and another portion projecting over
the surface of the head immediately surrounding
the trunnion, an annular abutment attached to
the inner surface of the head in concentric ar
rangement with the trunnion, the abutment hav
ing both its inner and its outer edges beveled and
undercut, the liners having outwardly facing
shoulders inclined to fit the shoulder on the inside
10 of the abutment, means for expanding the liners
to increase its diameter and force the shoulders
thereof into interlocking engagement with the
inner shoulder on the abutment, a second abut
,ment means positioned adjacent the periphery
of the head and spaced from the ?rst abut
ment, the inner edge of the outer abutment means
being beveled and undercut, a plurality of two
part, truncated, sector-shaped liners located in the
annular area between the abutments, each part 5
of the liners having a shoulder facing the under
cut shoulder of the adjacent abutment and wedge
means interposed between the two parts of each
liner for expanding the annular liner assembly
radially to secure engagement between the shoul
ders of the abutment and the shoulders of the
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