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Патент USA US3096047

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July 2, 1963
E. J. DEAR ETAE
.
3,096,037
ORE PULVERIZER WITH CENTRIFUGAL IMPACT vAGTION
Filed March 5, 1962
.
2 Sheets-Sheet 1
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22
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22
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INVENTORS
ERw/v J?EAR
By ?oss/er imp/.55
Arron/5y
July 2, 1963 7
E. J. DEAR ETAL
3,096,037
ORE PULVERIZER WITH CENTRIFUGAL. IMPACT ACTION
Filed March 5, 1962
2 Sheets-Sheet 2
INVENTORS
Enmv d’ ?EAR
By ?oag'Rr JmPLEs
ATTORNEY
United States Patent 0 " "ice
2
1
3,096,037
ORE PULVERIZER WITH CENTRIFUGAL
ACT ACTEON
Ervin .1. Bear, 495 N. Bowling Green Ave, Los Angeles,
Calif, and Robert W. Staples, 14826 Wyandotte Sh,
Van Nays, Calif.
Filed Mar. 5, 1962, Ser. No. 177,421
8 Claims. (Cl. 241—275)
356961137
Patented July 2, 1963
17 extending substantially to the rear end of the frame.
Housing B is of shallow cylindrical ‘drum shape, com
prising a cylindrical rim 20; a ?at circular back wall
21 peripherally welded to the rear margin of rim 20;
radial ears 22 integral with or welded to the forward
margin rim of rim 20 and projecting outwardly in the
plane of said forward margin; and a ?at circular front
wall 23, detachably secured to the ears 22 by bolts 19.
Fitted within the rim 20‘ is a thick cylindrical target ring
This invention relates to ore pulverizing mills of the 10 24 having circumferentially spaced, transverse pulverizing
teeth 25. Preferably, target ring 24 is of cast steel,
extends circumferentially through an arc of approximate
ly 300 degrees and has in a lower right sector thereof,
No. 2,999,652, issued September 12, 1961. The general
as viewed from the front (FIG. 2) a ‘gap 26 which is
object of the present invention is to provide improve
ments in the mill of that patent.
15 bridged by a smooth arcuate liner bar 27.
Flat circular liner rings 28 and 29 are disposed ad
More speci?cally, the invention aims to provide a
jacent the wall 21 and front wall 23 respectively, a flat
mill having a pulverizing action of greatly improved ef
circular gasket 30 being interposed between the front
?ciency, both as to its capacity in terms of volume of
liner ring 29 and the front wall 23. Ring 30 may be
ore pulverized per hour, and the ?neness with which
the ‘ore is reduced to powder form. The invention is 20 of rubber or equivalent plastic material. The periph
eral portions of liner rings 28 and 29 are engaged against
adapted to process from 35 to 50 tons per day of ore,
the flat front and rear faces of target ring 24, which
reducing the ore chunks in a single run (without a rerun)
functions as a spacer to maintain the rear liner ring 23
to a ?neness such that 65% of the pulverized material
type having a centrifugal impact type of pulverizing ac
tion such as the mill shown in the patent of E. J. Dear
will pass a 100 mesh screen and 95% will pass a 30
mesh screen.
in face to face contact with rear wall 21 and the front
liner ring 29 pressed against the gasket 30, which is
under compression between the ring 29 and front wall 23.
Between the liner rings 28 and 29, the target ring
24, and the periphery of rotor C, there is de?ned a
pulverizing chamber .31 in which the ore is pulverized
periphery and having an improved centrifugal pumping 30 against the target ring 24 as it is expelled by centrifugal
force from the rotor C.
action in delivering the pulverized tore through its outlet.
At the bottom of the housing, the rim 20 is welded
A further object is to provide such a pulverizing mill
to the forward cross member 11 of the base at the center
having {greatly improved sturdiness and long wear life.
thereof.
This is an especially important attainment of the inven
In the center .of front wall 23 is an inlet port 32. A
tion, since in this type of mill, the ore, as it is being
hopper, having a downwardly and inwardly sloping front
pulverized, has an extremely high degree of abrasive ac
wall 33 and triangular side walls 34 which converge
tion against the pulverizing elements of the mill.
downwardly, is secured to the front wall 23 by welding
Other objects and advantages will become apparent in
A further object of the invention is to provide a
pulverizing mill that will operate with a minimum of
loss of the pulverized material into the atmosphere,
being sealed against any substantial leakage around this
the ensuing speci?cation and appended drawing in which:
FIG. 1 is a perspective view ‘of a pulverizing mill em
bodying our invention;
FIG. 2 is a front elevational view of the same parts
being broken away and shown in section to illustrate
the internal construction;
the lower end of front wall 33 and the rear margins
of side walls 34 to the front Wall 23 around the inlet
port 32. A front circular collar 35 Welded to the inner
face of front wall 23 around port 32, extends the latter
toward the center of rotor C.
A discharge nozzle 36, consisting of a short length of
FIG. 3 is a detail cross sectional view ‘of one of the 45 cylindrical tubing, is welded to the front wall 23 around
centrifugal ejection nozzle and bat assemblies taken
a [discharge port 37 therein and projects forwardly, paral
on the line 3—3 of ‘FIG. 2;
FIG. 4 is an axial section of view taken on the line
lel to the rotary axis of the mill. The discharge nozzle
36 is located in communication with the gap 26 in
target ring 24, near the end of the sweep of projecting
parts of rotor C as they traverse the gap. This arrange—
4—4 of FIG. 2; and
FIG. 5 is a perspective view ‘of the rear side of the
mill.
Referring now to the drawings in detail, we have shown
therein as an example of one form in which our inven
ment improves the centrifugal discharge of the pulverized
ore as will be explained more fully hereinafter.
Secured to the back wall 21 is a bracket 38, the top
of which is horizontal and disposed below a circular aper
tion may be embodied, an ore pulverizing mill compris
ing, in general, a supporting base A, a housing B, a rotor 55 ture 39 in back wall 21, sufficiently to accommodate the
radial width of a series of antifrictions bearings 40 and
C rotating within the housing B, and a motor D for
retainer collars 41 in which the bearings are mounted
driving the rotor C.
Detailed Description
on the bracket 38.
Rotor C embodies centri ugal nozzles comprising
Base A comprises a rectangular frame consisting of 60 tubes 45 of rectangular cross section welded together at
a pair ‘of side walls 10 connected by cross bars 11 and
their inner ends in the form of a cross, and buttressed
12; a middle longitudinal bar 13 welded at its ends to the
by gussets 46 of channel section, triangular in side eleva
cross bars 11 and 12; a motor shelf 14 bridging between
tion, and each having a hypotenuse web portion extended
and secured to one of the side rails 10 and the middle
and bent back at its apex to provide a seat 47. The
bar 13; a pair of gusset plates 15 each Welded at one end 65 triangular side wings 'of the channel section have their
to the forward end of a respective side rail 10 and at
right-angular edges ?tted into the corners between the
its other end to the rim of housing B somewhat below
four nozzles 45 at the junctions thereof and are welded
the center thereof; and a pair of brace rods 16 and 17
thereto.
The inner ends of nozzles 45 are in open communica
each welded at its forward end to the back of housing B
somewhat above the center thereof and at its rear end 70 tion with one another and with an inlet mouth 48 de?ned
by a mouth ring 49 which is welded to the forward Walls
to a respective side rail 10, the brace rod 16 being dis
posed forwardly .of the motor shelf 14 and the brace rod
of the adjoining inward ends of the nozzles 45. Opposite
3,096,037
3
the mouth ring 49‘ a circular hub disk 50' is welded to
the rear walls of the adjoining inward ends of the nozzles
45 and closes the square space de?ned between these
inward ends. At'their outer ends, nozzles 45 have dis
charge mouths 44.
Welded to the center of the hub disk 55 is a shaft 51
which is mounted in the ball-bearings 45, thus support
ing the rotor for high speed rotation within the housing
B.
Secured to the rear end of shaft 51 is a pulley 52
4
Operation
In a general way, the operation of our improved mill
will be apparent from the foregoing description. One
of its improvements in arrangements of parts and opera
tion is the mounting of the bats 65 forwardly of the
discharge mouths of the centrifugal nozzles 45. Thus,
chunks of ore discharged from one nozzle and rebound
ing inwardly in the pulverizing chamber 31, will be struck
by the bat 65 of a trailing nozzle. We ?nd that a con
which receives drive from the motor D, transmitted 10 siderable speeding up of pulverization is attained by this
through a driving pulley 53 On the motor shaft and a
arrangement, apparently due to the fact that the elapsed
belt 54 trained around the pulleys 52 and 53.
time of discharge of an ore chunk from the end of one
Secured to the rear Wall of each nozzle 45 is an im
nozzle and its rebound ‘back into the path of orbiting
peller plate 57 ‘of wedge shape, increasing in thickness
movement of the bats 65 will, for a majority of ore
from its inner end to its outer end. The chunks of ore 15 chunks, correspond to the elapsed time of movement of
entering the rotor through the mouth 48 will be de?ected
the bat of the next railing nozzle up to the vicinity of
radially outwardly by streams of air which are drawn
the rebounding ore fragment.
outwardly through the nozzles 45 (the rotor functioning
The gasket 30 seals the periphery of chamber B sub~
as a centrifugal pump) will be'engaged by the impeller
stantially air-tight so that no pulverized material can
plates 57, and will slide outwardly against the plates 57 20 seep from the periphery of the housing. This pneumatic
until discharged from the nozzle months 44 at high speed
sealing of the housing periphery also increases the centrif
through centrifugal action. The direction of the ore
ugal pumping effect and provides an increased volume
chunks as they slide outwardly against impeller plates
57 is stabilized in radial planes by a series of longitudinal
of air ?ow through the apparatus.
.
In the chamber 31, along the length of‘ target ring 24,
' ?utes 58 on the inner face of each impeller plate 57. 25 the circumferential ?ow of air is disturbed by eddy cur
The inner ends of impeller plates 58 project inwardly past
the open inner ends of nozzles 45 into the central area
of the impeller, to intercept the ore chunks and guide
them into the nozzles 45.
The wedge shape of the impeller plates 57 has two
advantages. It provides -a forwardly tilted inclination
in the impelling surfaces, increasing the centripetal pres
sure against the ore chunks tending to retard their pas
sage through the nozzles and correspondingly increasing
rents created by the transversely extending teeth 25, such
eddy currents improving the pulverizing effect. In the
gap 26, there is an undisturbed sweep of the circum—
ferentially moving air stream which tends to crowd out
wardly against the smooth wear plate 27 under the
effect of centrifugal force, vand where the target ring 24
commences, just beyond the outlet port 37, its projecting
end constitutes a barrier to the further circumferential
?ow of the air moving in gap 26. The upstream pressure
the centrifugal momentum of the ore chunks as they are 35 on the body of air moving in gap ‘26, meeting this in
released from the outer ends of the nozzles so that they
will impact with greater force against the target ring 24,
and correspondingly increasing the explosive force of
impact against the teeth 25.
The outer ends of impeller plates 57 are abutted against
seat bars 59 secured to and traversing the rear walls of
the respective nozzles 45 at their outer ends. The seat
creased ?ow resistance on the downstream side of outlet
port 37, creates a maximum discharge pressure in the
port 37, resulting in a pressurized stream of airborne ore
powder constantly discharged from the mouth of nozzle
36, while the larger fragments of ore that have not been
reduced to the predetermined degree of ?neness, will
sweep pass the outlet port 37, reentering the pulverizing
bars 59 take the centrifugal loads developed in the im
chamber 31 for further pulverization.
peller plates 57 by the high speed rotation of the rotor.
The centrifugal nozzles 45 have ‘an aggregate cross
Impeller plates 57 are removably secured to the rear 45 sectional area substantially equivalent to the peripheral
walls of the nozzles by studs 60, anchored in the centers
area of the central chamber of rotor C with which the
of the respective impeller plates, the studs 69 extending
four nozzles communicate. That is to say, the periphery
through openings in the rear walls of the respective
of this central chamber is substantially wholly open so
nozzles and being secured by nuts 61, threaded thereon.
that there is no restriction to the outward flow of ore
The pieces of the ore chunks which are not pulverized
chunks entering the chamber through the inlet mouth 43.
at the ?rst impact when thrown from nozzles 4-5, will
The streams of ore chunks moving outwardly in the
rebound inwardly into the path of pulverizing bats 65.
nozzles 45 are wholly enclosed by the four walls of each
Bats 65 are positioned against the seats 47 at the apex
nozzle and thus are more accurately directed in their
ends of gussets 46, and are held in place by threaded
tangential paths of discharge from the ends of the nozzles
studs 66, anchored in the respective bats, extending 55 as indicated by arrow 70.
through apertures in the forward walls of nozzles 45, and
We claim:
secured by nuts 67 threaded on the respective studs 66,
1. In an ore pulverizing mill, in combination: a housing
and reinforcing plates 68, interposed between the nuts
comprising a rim, front and back walls secured to said
'67 and the forward walls of the nozzles. The bats 65
rim in axially-spaced parallel relation, a target ring lining
are thick rectangular blocks of hard, tough material 60 the inner wall of said rim, an inlet in one of said walls
such as manganese steel (are also the impeller plates 57).
at the center thereof, and an outlet in one of said walls,
The forward faces of bats 65 are spaced forwardly
adjacent said rim; and a rotor rotatable within said hous
from the radial axes of the respective nozzles 45 a dis
ing,
having an inlet port communicating with said housing
tance such that they are tilted rearwardly at an angle of
approximately 30 degrees to respective radii intersecting 65 inlet and a plurality of peripheral discharge mouths for
delivering ore chunks outwardly against said target ring;
such forward faces. Consequently, as the unpulverized
‘said target ring being of split ring form, with circumferen
fragments of ore are bounced from the target ring 24
tially-spaced ends de?ning a .gap extending circumferen
back into the path of the bats 65, they will be struck a
tially
to said outlet in the direction of rotation of said
‘glancing blow such as to de?ect them outwardly for fur
ther impact with the target ring 24.
70 rotor, from a point spaced from said outlet.
The outer ends of nozzles 45 are each provided with a
pair of ?at wearplates 70 which are welded to the side
wall of said outer ends in embracing relation thereto.
The plates 70 rotate between the inner portions of liner
‘rings 28 and 29 in closely spaced relation thereto.
75
2. In an ore pulverizing mill, in combination: a housing
comprising a rim front and back walls secured to said
rim in axially-spaced parallel relation, a target ring lining
the inner wall of said rim, an inlet in one of said walls
at the center thereof, and an outlet in said housing, adja
3,096,037
6
cent said rim; and a rotor rotatable within said housing,
having an inlet port communicating with said housing in
let and a plurality of peripheral discharge mouths for
the inner wall of said rim, an inlet in one of said walls at
delivering ore chunks outwardly against said target ring;
said target ring being of split ring form, with circum
ing an inlet port communicating with said housing inlet,
a plurality of nozzles of rectangular section tube form,
ferentially-spaced ends de?ning a gap extending circum
ferentially to said outlet in the direction of rotation of
said rotor, from a point between 30° and 60° in advance
of said outlet, and means providing a smooth, arcuate
wall along the bottom of said gap.
10
having intercommunicating open inner ends joined to one
another and communicating with said inlet port, and,
on each nozzle, a ‘disintegrating bat attached to the front
nozzle wall on the forward side thereof.
3. In an ore pulverizing mill, in combination: a hous
the center thereof, and an outlet in said housing, adjacent
said rim; and a rotor rotatable within said housing, hav
7. In an ore pulverizing mill, in combination: a housing
comprising a rim, front and back walls secured to said
ing comprising a rim, front and back walls secured to
rim in axially-spaced relation, a target ring lining the
said rim in axially-spaced relation, a target ring lining
inner wall of said rim, an inlet in one of said walls at the
center thereof, and an outlet in said housing, adjacent
at the center thereof, and an outlet in said housing, adja 15 said rim; and a rotor rotatable within said housing, hav
ing an ‘inlet port communicating with said housing inlet,
cent said rim; and a rotor rotatable within said housing,
having an inlet port communicating with said housing
a plurality of nozzles of rectangular section tube form,
having intercommunicating open inner ends joined to one
inlet, a plurality of nozzles of rectangular section tube
the inner wall of said rim, an inlet in one of said walls
form, having intercommunicating open inner ends joined
another and communicating with said inlet port, and,
to one another and communicating with said inlet port, and 20 on each nozzle, a disintegrating bat attached to the front
in each of said nozzles, an impeller plate attached to the
nozzle wall on the forward side thereof, said bat being in
the form of a thick rectangular block having a back face
back wall thereof, said plate being of wedge shape lon
gitudinally of the nozzle and converging in relation to
seated against the forward face ‘of said front wall, and
having a front face converging outwardly in relation
the front wall of the nozzle toward the discharge mouth
thereof.
25 to a radius of the rotor intersecting its outward extremity.
4. A mill as de?ned in claim 5, including a seat integral
8. In an ore pulverizing mill, in combination: a housing
with and extending circumferentially into said mouth from
comprising a rim, front and back walls secured to said
the outer end of the nozzle back wall, the outer end of
rim in axially-spaced relation, a tar-get ring lining the inner
said impeller plate being supported against said seat; and
wall of said rim, an inlet in one of said walls at the center
a fastener extending through said nozzle back wall, and 30 thereof, and an outlet in said housing, adjacent said rim;
anchoring an intermediate portion of said impeller plate
and a rotor rotatable within said housing, having an inlet
port communicating with said housing inlet, a plurality of
thereto.
5. In an ore pulverizing mill, in combination: a hous
nozzles of rectangular section tube form, having inter
ing comprising a rim, front and back walls secured to said
communicating open inner ends joined to one another and
rim in axially-spaced relation, a target ring lining the inner 35 communicating with said inlet port, and, on each nozzle,
wall of said rim, an inlet in one of said walls at the center
2. disintegrating bat attached to the front nozzle wall on
thereof, and an outlet in said housing, adjacent said rim;
the forward side thereof, said bat having a major portion
and a rotor rotatable within said housing, having an inlet
of its area overlapping and seated against the forward
port communicating with said housing inlet, a plurality
face of said front wall, and having an outer end portion
of nozzles of rectangular section tube form, having inter 40 projecting outwardly beyond the outer end of the nozzle.
communicating open inner ends joined to one another and
communicating with said inlet port, and, in each nozzle,
an impeller plate secured to the inner face of the back
wall of the nozzle and extending longitudinally thereof,
said plate having a forward face provided with longitudi 45
nally extending ribs for guiding ore chunks outwardly in
the nozzle in sliding movements thereagainst.
6. In an ore pulverizing mill, in combination: a hous
ing comprising a rim, ‘front and back walls secured to
said rim in axially-spaced relation, a target ring lining 50
References Cited in the ?le of this patent
UNITED STATES PATENTS
251,803
1,499,455
2,806,496
2,920,830
2,999,652
Starkey ______________ __ Ian. 3,
Hadsel ________________ __ July 1,
Waring _____________ __ Sept. 17,
Nyrop et al. __________ __ Jan. 12,
Dear _______________ __ Sept. 12,
1882.
1924
1957
1960
1962
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