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Патент USA US2405633

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Aug. i3, i946;
2,405,633
L.. M. BARKER E'rAL
GRI-NDING MILL
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Filed Jan. *13,* 1_9 l5:5
N
IN VEN TORS.
'
.LNE MBAR/(Ear
EATAN @Lew/S
Patented Aug. 13, 1946
234
l
Unirse@ stares PATENT' rrle
GRINDING MILL
Lyle lVL. Barker and. Evan. G.. Lewis,l Ajo, Ariz.,
assi‘gnors. to Phelps Dodge Corporation„ New
York; NL Y., a> corporation AofiNew York
Application January 13, 1943; Serial’ltlo‘..432,200.v`
1
This invention relates to> grinding mills in which
the commi-notion. of orel orY other material is- ef
fected, by the grinding action of- a massof moving
balls, pebbles, or thelike, within arotating cylin
der, and` in which thecomminuted-y materialis dis
charged-through a grated portion> of the-cylinder.
In. mills ofI this type the` pluggingV of the grate
openings by worn grinding media, larger particles
of ore, or the like constitutes afsource of consid
erable. annoyance, necessitates loss or operating
time in repeated cleaning of the grates, and re
sults in. substantial. diminutionl of mill capacity
and eiilciency.
The prime object of thepresent inventionis to
provide a grated discharge portion ofjagrinding
millv which enables ready egress of ground mate
rials, worn grinding meda, or other materials hav
ing certain maximum dimensionswithout the ob
jectionable clogging tendencies exhibited in prior
wardly from saidliner'ß, areshown at 9 andlll;
Pulp‘li-fter` elements IIA of conventional fermA are
also shown;
In carrying` outy our invention, We form dis
charge slots; such afsîare shown- at I2, by mounting
elements- I3 of rubber'o‘r other» suitable resilient
material» inr> suitably spaced` relationship. Inv the
embodiment. illustrated; these resilient elements
I3' are-fmoulntedI in7 cut out portions of the' liners
8, 9., andfIIl; and are attached to'and'i-lrmly mai-n
tained inîposition» by backing plates Iá‘welded or
otherwiselsuitably secured.- to said'liners or tothe
dischargehead 3». As shown, said backing plates
i4 terminate short of the edges` of thefrubber ele
ments= I3 tot enable iiexurefof` said- edges-v tothe
extent` desired.
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We.Y furthermore, sofspace. theliners 8, 3, and
Iûïwit-h- respect >toeachf other as- to form between
them channels |15-0f such width or form‘as to' per
20 mit:ready« movement within“ said- channels of the
largestV ball, or other grinding» member in the
charge: The linersiwhich‘ form-the' channel also
ticularly simple. and eiîectivemanner; and, which
functionftoprevent direct» action of any large por
enables the advantagesof millsofY the type, men
tionoii thecharge of grinding members -upon the
tioned. to be utilized fully-„withoutinterferenceby
objectionable plugging. of' thel discharge grates.
25 rubber elements I3. '
`
It williV beiV understood» that the cylinder '2, lining
Other features andvadvantages ofthe invention,
constructions. The invention provides a mill dis
charge end which- fulfills this. purpose in apar
will be hereinafter. described. and claimed. y
In the accompanying drawing:
'I~, head- 3., centerpiece-= 4, liners 8, 9; and IIB, and
lifters- I«.I arefsuitablyY fastened together to ro*
tate in` unison inthe operation- of the mill'.l The
li‘ig.> 1. is» a fragmentary elevation, as viewed
from the> inside, showing a. portion. of. the dis 30 lif-ters Iltare integral,4 with the heade3», which is
suitably secured» tothey cylinder 2- and center-piece
charge end-of agrinding.milllembodyingoneform.
of' our invention.
4.; while' the liners 83 8, and IUA andV associated
backing- plates i4? are suitably fastenedr to the
Fig. 2 is. a fragmentary View invertical, section,
taken on lineZ-Zof Fig. 1.
li-fters-r II.
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`
In assemblingl said liners and- associated parts,
Fig. 3 is a horizontal section, on an.. enlarged` 35
the» liner- I0- mayy first have attachedv thereto a
scale, taken on-1ine3-3 of Fig.v 1.
»
rubber element I3 and aback-ing- pla-te I4.. The
Since our invention. relates only to> the dis-~
charge end of the grinding mill, and, as the gen
latter may be fastened: toY the» liner by suitable
eral construction. of such. mills. is-- well. known> to
boltsorbywelding». Thereafter, said-liner II) may
persons familiar with the art,> we will describe. 40 be. inserted intofthe. head 3 and secured therein
particularly only thedischarge endof the mill..
by a suitably tight ñt, or by welding or otherwise»
Referring to the, drawing, 2 designates the> cy
fasteningy the backing plate I-@f tov the¢ lifter»n II.
lindrical shell or main body portionof theigrind-~
Liner 8, after having> a» rubber element I 3- and
backing- plate I4 attached thereto may thenv be
ing mill, and. 3 the head. which> closes- the dis
chargeendv of said. shell. Secured to said` head 3 45 placed in the desired' position on»Y the lifters» H
and fastened..in.» position through said plateV It.
i's the customary centerpiece. 4.which, as shown»,
may include> a passage 5„ servingV as. an. observa--v
Said liner 8 mayÍ also,r asshown, have». a similar
tion port and asa. point of addition of balls or>
plate» t4’ interposedY between said liner 'and said
other grinding media. Said centerpiece-- also has.
lifter and» suitably fastened.v thereto-_ Then. the
formed therein a diversion passage. Iìvfor the> mill 50 liner‘9», after having,V rubber elements I3 andback
product. Thev shell 2..is.provided.with a-lining 1
ing, plate. Ill attached thereto; is placed. Von the
of suitable refractory material. At center end
litters» I.I` inthe desired spaced. relationship with
respect to? the. liners-‘8 and lill; following which
liner, which may be of. form- and material: best
adapted> for grinding conditions, isindicated at:
said liner 9 is securedtmsaid» litters III through
8'; while other suitable end liners, disposed out-_ 55 said plate I4 in any desired manner. The cen
2,405,633
3
4
terpiece 4 may then be inserted into the head 3
and secured thereto, after which said head may
be secured to the cylinder 2.
In operation, the parts above described rotate
in unison, and the balls or other grinding ele
ments act upontheore, or other material to be
ground, in the cylinder 2. The comminuted par
ticles pass through the slots I2, provided by the
rubber elements I3, and thence into the spaces
between the lifters H, whence said particles are 10
directed outwardly through the passage 6.
.
It will be observed not only that the plates I4
.
The backing plates I 4 may be Vof rigid mate
rial such as steel, or of material resilient and
iiexible in character, such as conveyor belting.
The terms and expressions which We have em
ployed are used as terms of description and not
of limitation, and We have no intention, in the
use of such terms and expressions, of excluding
any equivalents of the features Vshown and de
scribed or portions thereof, but recognize that
various modiiications are possible within the
scope of the invention claimed.
We claim:
provide backing for the rubber elementsyIB‘ by
1. Grinding mill discharge means comprising
extending beyond the liners, but also that said
members deñning a channel, a plurality of re
plates, by terminating short _of the edges 1 of said 15 silient elements mounted on said members at the
elements` provide for controlled ñexure of said.
base of said channel and defining a slot, and
edges. Said plates may be so positioned with
respect to said edges as to control iiexure of the'
backing means extending beyond said members
' over portions of said resilient elements and ter
A ball mill equipped with a discharge end em-v
minating short of the slot defining edges of said
elements.
bodying our invention has been found to maintain
full efliciency for a prolonged period, without in
terruption and without any evidence of plugging.
The freedom from the necessity of periodic clean
ing of grates, and the gains in capacity and eiii 25
2. Grinding millsdischarge means comprising
members~ deñning a channel in communication
with the grinding chamber of the mill, resilient
elements in spaced relationship defining a slot at
the base of said channel, and backing means for
latter to the desired extent.
_ _
».
ciency resulting from lthe avoidance of grate clog
ging, are substantial and important advantages.
» said resilient elements, said backing means ex
tending 'over portions of said elements but ter
minating short of the> slot forming edges of said
While we do not assert any particular Atheory
as controlling or conclusive with respect to the
elements.H
advantages attained by our'inven'tion, WeV believe
thatone vreason for the attainment of those ad
Y
’
,
3. Grinding mill discharge means comprising
members defining a" channel >in communication
vantages is the capability of the resilient ele
ments I3 to dislodge, or feed back into the cylin
with the grinding chamber of the mill, said chan
nel being of such form as to permit'free move
der 2, oversize particles'which may become mo
ment of grinding elements within it, resilient
elements disposed at ‘the base of said channel
mentarily lodged between said elements. In that
connection, it is to be noted that the width of
the slot t2 between adjacent rubber elements I3>
is fixed only so long as said elements are not '
and defining a slot at said base, and backing
means extending into overlapping relation with
portions of said resilient elements and with por
tions of said channel, said backing means ter
deformed from their original positions. The slot
also has depth, i. e., that of the thickness of the 40 minating short of the slot-deñning edges of said
rubber, Vand its Walls are constantly parallel when ~ '
in normal position. However, upon i'lexure of
the rubber elements 'the width of the slot in
creases, and the walls diverge in the direction of
deformation. Now, when a particle is presented
elements.
4.,Discharge means for a grinding mill of the
type comprising a rotatable casing providing a
45
chamber for material to be ground, said discharge
means comprising members defining a channel
at a slot I2 and forced against the adjacent ele- ` ~~ for` receiving material from said chamber, and
ments I3, that particle can pass only if its mini
means defining a slot at the discharge side of
mum dimension is such that it'may enter the
said channel, said means comprising a strip of
slot under the condition of maximum slot de
resilient material secured at one edge to one of
formation. If the forces tending to move the 50 said channel-defining members, said strip having
particleA into the slot are not adequate for the Aa substantial portion extending beyond said
purpose, the reiiex of the rubber elements rejects
member and terminating in a free edge in said
it when'the forces ‘are removed. It is also pos-Y
channel, said portion being freely movable inv a
sible that particles of certain shane maybe tem
direction outwardly from said channel in response
porarily retained in the slot and that the flexing 55 to pressure exertedthereon by material within
and deformation of the rubber elements resulting ~ said channel.
from the subsequent entry of other particles ac
5. Discharge> means for a grinding mill of the
complishes their release. But whatever may be
type comprising a rotatable casing providing a
the theory, We have found the construction illus
chamber for material to be ground, said discharge
trated to be highly effective in obviating clogging, 30 means comprising members defining a channel
with the consequent advantages hereinbefore re
for receiving material from said chamber, and
ferred to.
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means defining a slot at the discharge side of said
The elements I3 may be of rubber or any other
channel, said means comprising a pair of strips
material having the desired strength. flexibility,
of _resilient materialeach secured at one edge to
and resiliency. Fabric-reinforced rubber,- con 65 aA corresponding _one of said channel-deñnîng
veyor-belt `cover stockrubber, orrthe so-called
members, each of said resilient strips having a
"iioating-stock” rubber are examples of suitable
substantial _portion extending beyond the corre
materials which may be employed.
'
sponding ychannel-delining member and terminat
We believe also that» the provision of channels
ingin a free edge in said channel, each of said
I5 oi’v such width or form asto permit ready 70 extending portions of said strips being freely mov-.
movement within them of the largest ball, or
able in a direction outwardly from said channel
other element in the grinding charge. augments
in response to pressure exerted thereon by mate
the effectiveness of the invention by enabling
rial within said channel. „
s
.
grinding elements to act upon particles in the
vE5. Discharge meansfor a grinding mill of the
channels adjacent the'slots.
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type comprising a rotatable casing providing a
2,405,633
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chamber for material to be ground, said discharge
sponding channel-deñning member and terminat
means comprising members defining a channel
ing in a free edge in said channel, each of said
extending portions of said strips being freely mov
for receiving material from said chamber, said
channel converging from its receiving side toward
its discharge side, and means defining a slot at
the discharge side of said channel, said means
comprising a strip of resilient material secured
at one edge to one of said channel-deñning mem
bers, said strip having a substantial portion ex
tending beyond said member and terminating in
a free edge in said channel, said portion being
freely movable in a direction outwardly from said
channel in response to pressure exerted thereon
by material within said channel, said channel
being of sufficient size to enable free movement
of grinding elements therewithin.
'7. Discharge means for a grinding mill of the
type comprising a rotatable casing providing a
chamber for material to be ground, said discharge
means comprising members defining a channel
able in a direction outwardly from said channel
in response to pressure exerted thereon by mate
rial Within said channel, said channel being of
such size as to enable free movement of grinding
elements therewithin.
8. Discharge means for a grinding mill of the
type comprising a rotatable casing providing a
chamber for material to be ground, said discharge
means comprising members deñning a channel
for receiving material from said chamber, and
means defining a slot at the discharge side of said
channe1, said means comprising a strip of re
silient material secured at one edge to one of said
channel-defining members, said strip having a
substantial portion extending beyond said mem
ber and terminating in a free edge in said chan
nel, and backing means extending beyond said
for receiving material from said chamber, said 20 channel-denning member over a portion of said
strip and terminating short of said free edge, the
channel converging from its receiving side toward
portion of said strip beyond said backing member
its discharge side, and means defining a slot at
being freely movable in a direction outwardly
the discharge side of said channe1, said means
from the channel in response to pressure exerted
comprising a pair of strips of resilient material
each secured at one edge to one of said channe1 25 thereon by material Within said channel.
LYLE MQ'BARKER.
deiining members, each of said strips having a
EVAN G. LEWIS.
substantial portion extending beyond the corre
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