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Feb. 3, 1959
w‘. E. ENDREZZE
2,872,042
DETACHABLE SPIRAL CONVEYOR ORE CLASSIFIER
Filed Oct. 25. 1954
3 Sheets—Sheet 1
(O
\§ \
IN VEN TOR.
may." 6W
BY
, Feb. 3, 1959
2, 872,042
W. E. ENDREZZE
DETACHABLE SPIRAL CONVEYOR ORE‘ OLASSIFIER
Filed Oct. 25. 1954
S Sheets-Sheet 2
IN VEN TOR.
Feb. 3, 1959
'
w. E. ENDREZZE
2,372,042
DETACHA‘BLE' SPIRAL CONVEYOR ORE CLASSIFIER
I
Filed Oct.
25.
1954
'
.
’ ' 1' 5 Sheets-Sheet 3
ice
has
2,872,042
Patented Feb. 3, 1959
as
it.)
.
' Figure 2 is a top plan view of a single compartment
classi?er, to illustrate the compact and ef?cient position
of the head-motion mechanism with the spiral conveyor
2,872,6l42
as represented in partial drawing.
’
Figure 3 is a partial cross-section taken on the line
3—3 of the tank of Figure 2 to illustrate the ribbon
DETACHABLE SPIRAL ‘CONVEYOR ORE
‘CLASSHFEER
?ight spiral conveyor in normal operating position along
William Eugene Endrezze, Long Beach, Calif.
Application Gctoher 25, 1954, Serial No. 464,409
4 Claims. (Cl. 209—464)
the bottom of the tank, with the lifting device attached
to the lower end of the spiral conveyor shaft.
Figure 4 is a front elevational view of the classi?er
head-motion as seen from the position-at line 4—-4 of
Figure 3.
This invention appertains to ore classi?ers and has for
its prime object to generally improve upon similar struc
tures now well known in the art as described by my Ore
porting axle cross member as seen from the position at
Classi?er patented May 21, 1929, 1,714,007, to provide
line 6—6 of Figure 5.
a more ef?cient and reliable operation in the separation
and classifying of materials which have different settling
the concentration of ores, or in the size of the
particles when homogeneous as in the separation of sand
drive.
25
The apparatus, however, is exempli?ed in the present
application as being designed particularly for classifying
the sands and slimes in wet crushed pulp for ore concen
tration and for convenience it will be assumed in the
a
This invention provides a simple and efficient head
motion, designed in such a manner as to be compact,
having no exposed moving parts, considerably shorten
ing the overall length of the classi?er and with less
head space required in its setting for operation.
Another important object of this invention is the
method by which the head-motion is mounted‘ upon an
axle shaft cross member to provide the means by which
the head-motion rocks on its axis in the raising and
_
Figure 9 is an end elevational view illustrating in ar
rangement the driving mechanism for the spiral conveyor
shaft.
Figure 10 illustrates a lift cylinder straight shaft and
coupler.
following description that the pulp is being treated for 30
that purpose.
.
Figure 7 is a preferred detachable form of the upper
end of the spiral conveyor shaft.
Figure 8 is a side elevational view of the Worm and
gear mechanism in arrangement for the purpose of this
invention. It illustrates an over system of spiral conveyor
rates in liquids, whether such difference is caused by
a variation in the speci?c gravity of the particles, as in
and slimes.
‘
Figure 5 is a side elevational view of the head-motion
mounted upon its tiltable supporting axle cross member.
Figure 6 is a rear elevational view of the head-motion
and spiral shaft bearing mounted upon its tiltable sup
,
Figure 11 is a partial rear view of a cast gear casing,
showing the axle through bar upon’ which the head-mo
tion rocks.
'
Figure 12 is an elevational cross sectional View of
the automatically actuated lift cylinder apparatus.
Figure 13 is a cross sectional view of the mechanism
that constitutes the operation of the slow leak valve.
Figures 1, 2, 3, and 4 illustrate the automatic spiral
conveyor end lifting and lowering mechanism.
Referring to the drawings in detail and particularly
-' the embodiment of the invention shown in Figures 1 to
lowering of the lower end of the spiral conveyor.
4 inclusive, it will be seen that the tank 3 forms an elon
A further object of this invention is to provide a simple
gated trough which is disposed at an incline, being suit
and’ ef?cient method of detaching the spiral conveyor
ably mounted in a frame supporting structure 4 which
from the head-motion by means of the spiral conveyor
is also inclined, one end of which may rest on the ?oor
shaft joints and coupler, leaving the mechanism of the do and the other end of which may be supported in eleva
head-motion undisturbed. A valuable consideration in
tion by a standard structure 5 or in any suitable man—
the cost when making repairs.
ner selected for installation.
A still further object of this invention is the method
The detachable spiral conveyor unit
of automatic lift by which the lower end of the spiral
conveyor is raised and lowered to compensate for the 50
Within the trough forming tank and extending lon
periodic overloading of the classi?er feed circuit, which
gitudinally at an incline is a ribbon ?ight spiral conveyor .
acts to prevent the stoppage of the classi?er at a critical
time, or any breakage of mechanism that might occur
due to overloading. It will be appreciated to know an
attendant operator is not required tobe present for man
ual care of the classi?er to prevent stoppage or breakage
of the classi?er when an overload in the feed circuit is
unit 2, a spiral conveyor shaft 6 is positioned within the
center of the unit and is provided with spokes 7 ‘in radial
arrangement extending therefrom and to_which the ribbon
?ight segments 8 are attached.
The spiral conveyor shaft 6 extending longitudinally
at an incline in the tank is formed at its lower end 9 to
receive a bearing structure (not shown) for the journal
10 upon which the spiral conveyor shaft 6 may rotate,
for my inventionare set forth in particular in the ap 60 the spiral conveyor shaft is separable from its support
ing journal at the coupler joint 11 serving as an im
pended claims. The invention itself, however, both as
portant and simple means by which the lower end bear
to its construction and its method by which the opera
ing 15 within the spiral conveyor shaft at 9 may be re
tion is accomplished, together with additional objects and
moved.
Further along in the description its importance
advantages thereof, will be best understood from thev
become quite apparent in the method by which the
following description of speci?c embodiments when read 65 will
spiral conveyor unit is. detached from the classi?er.
‘ in connection with the'accompanying drawings in which:
The journal 10 is provided to slide up and down in a
Figure 1 is a side elevational view of the present im
U-like frame 12 which is secured to the lower end wall
proved ore classi?er, to illustrate the simple and ef?cient
13 of the tank, and acts as ‘a guide support along with the
method by which the ribbon ?ight spiral conveyor is
lift cylinder 35 and its cylinder shaft 36 for retaining the
detached, yet leaving the head-motion mechanism undis
lower end of the spiral conveyor shaft in its up and down
building up against the spiral conveyor of the classi?er.
The novel features which i consider as a characteristic
turbed.
.
'
' movement. I wish to be understood I do not claim con
9,872,042
3
4
cep‘tion of the U frame 12 and slide 14 now well known
thereby providing a means by which the gear casing
and in use by overhead hoisting mechanism. I thereby
con?ne myself strictly within the scope of the lifting de
24 and the main shaft bearing 22 moves upwards in
a manner of jump up and forward push away from
the end wall 34 in the direction of the arrow, when the
lower end of the spiral conveyor shaft 6 is lifted. This
is well shown in Figure 1. This structure is contrary
to existing structures where the bevel gear is next to
the upper end wall 34 and the main spiral conveyor
shaft hearing such as 22 positioned in front of the bevel
vice de?ned by my co-pending application Serial No.
280,217 to which this'invention is an addition.
The spiral ‘conveyor shaft coupler
‘ At ‘the upper end the spiral conveyor shaft 6 is
formed to be coupled at a joint 16 to an extension coupler
"17,'thereby forming an important and simple means by ll) gear and having the pillow block of the main bearing
pintled to rock on its center, thus restricting the dis
tance the lower end of the spiral conveyor shaft may be
lifted before the bevel drive gear is jammed into the
upper end wall 34 of the tank. To remove the spiral
which the spiral vconveyor unit 2 may be detached and
removed from the ‘classi?er without disturbing the
mechanism of the head-motion unit 1. The coupler or
a ‘slip ‘joint which I ‘prefer as shown in the Figure l hav
ing the spiral conveyor detached from the classi?er and
suspended‘from the crane bail‘18. The slip joint coupler
conveyor from existing structures the upper main bearing
and its allied parts must be dismantled, the bevel gear
would comprise a female drive ‘socket 19 to receive the
is ?xed to the conveyor shaft and must be removed with
driven'male member 20 ‘and rigidly locked by a drift pin
21 that'makes solid the coupling ‘joint 16 by which the
it thereby breaking up the entire head-motion assembly.
This is a costly operation in the procedure of repairs
While in that of my structure the
operation is, simply lift the lower end of the spiral con
veyor with its lower end bearing assembly to the proper
horizontal height to clear the lower end wall 13 of the
by a gear wheel such as the worm vgear 23 as shown in
tank, slip the rear hearing from the end of the spiral
Figure 9.
_
,
25 conveyor shaft coming apart at the joint 11, drive out
The detachable head-‘motion unit
the drift pin 21 unlocking the coupler joint 16 and slide
Referring to the drawings Figures 5 to. 9 inclusive,
the conveyor shaft 6 backwards to disengage the male
vbest seen in Figures 8 and 6 I provide an over system of i member 20 from the extension coupler 17 coming apart
drive, over the axle cross member, over the top-periphery
at the joint 16. The entire spiral conveyor is detached
of the worm gear, designed for the purpose in such a
spiral conveyo‘r'shaftis ‘made to‘rotater
20 and replacements.
The extension coupler 17 in tu‘rn'is journaled in the
upper main bearing 22 and is itself connected to be driven
from ‘the classi?er to be removed and replaced with a
spare reconditioned spiral conveyor and the classi?er
manner“ desirable for operation in the raising and lower
ing of the lower end of the spiral conveyor, to consist of
but few parts running in oil for long life and the ease
by which the moving parts may be removed and re
placed or the entire head-motion unit 1 removed and
replaced. Attached to the vgear casing 24 and rocking
with it is a motor 25 that drives a pinion gear 26 within
the casing, the pinion gear turns the gear 27 ?xed on the
shaft '28 with the Worm 29, which in turn drives the worm
gear 23 and consequently the entire spiral conveyor as
sembly. Here it will be seen the worm tracks the top
is again ready for operation, the entire procedure re
quiring less than a half hour from stop to start. As
the ribbon ?ight segments receive considerable wear,
they ‘require most frequent repairs and replacement, it
is the spiral conveyor assembly that ‘requires most fre—
quent removal from the classi?er for repairs. This is
now made a simple and quick operation by the method
as
periphery of the worm gear allowing the motor with its’
pinion gear to be attached well up on the gear casing,
the gear casing is mounted to the front and above the
‘axle cross member '30 which may be a through bar or hav
ing pintle ends 31 turning in bearings 32 which may be
supported on side brackets 33 as shown in the drawings.
The method of construction of the casing will determine
the position and location of the main upper bearing and
the axle cross member for the purpose'of this invention.
This structure provides an over system (over the axle 50
cross member) of head-motion to operate by rocking
forward and backward in ‘operation as the lower end of
the‘spiral conveyor is raised and lowered, or for detach
ing the spiral ‘conveyor assembly as in Figure 1. It’
should 'be noted the axle cross member makes possible
the tilting of the head-motion mechanism without ‘restric
tion by any of its parts. A head-motion mechanism as
of this invention. It being not necessary to disturb
the mechanism of the head-motion and the job made
simple, this effects a great saving in shut-downs and cost
of rep'airs,"and with a great many classi?ers operating
in a ‘concentrator this is a very important consideration.
The spiral conveyor lifting system
Referring to the drawings, Figures 1 to 4 inclusive,
within the tank and at the lower end wall 13 an auto
matic lifting device is provided to raise and lower the
lower end ‘of the spiral conveyor unit 2 within the tank.
The purpose for which the automatic lifting device is
provided is to compensate for the periodic over load
ing of ‘the classi?er due to excessive feed in the classi?er
circuit.
To counteract this I provide a combination
air lift and hydraulic lift cylinder 35 which is in operat
‘ing ‘engagement with ‘the lower end of the spiral conveyor
shaft 6 by means of the yoke ‘shaft 36 engaging the
side pins 37 provided upon the lower end journal 10.
This yoke shaft 36 may also be a straight jack shaft
here provided does not smear a great area around it with
38 coupled to the bottom of the lower end journal 10 by
grease as is common with the bevel gear and pinion
drive of conventional classi?ers, nor is there the danger 60 the coupler 39 and pin '40 as shown in Figure 10.
For operation of the automatic lift by air, low pres
as exits with these exposed bevel gears. Drive belts that
sure air is supplied through the piping 41 to the valve
slip and wear out have been eliminated. Sand and
crushed rock from spill overs cannot get into the gears
as is common with bevel gear drives.
And the gears are
not susceptible of being stripped as is common with bevel
gears.
Referring ‘to Figures 2, 3, 5, and 6 it will be seen the
axle cross member 30 is positioned close to the upper
end wall 34 of the tank while the longitudinal axis
center of the spiral conveyor shaft is in a position ele
vated above the axle cross member and, the main
‘spiral ‘shaft bearing 22 is also in a position elevated
‘above the axle cross member close to the upper end
wall 34 of the tank, the head-motion gear casing is
to the front of the axle cross member and above it,
box pump 42 by way of the air passage 43 into‘the
lift cylinder 35, the air is pumped by means of the
pump plunger 44 connected‘ to the eccentric 45 which is
operated by the pump motor 46. When a circuit feed
to the classi?ers inexcess to the normal feed load
enters‘ the classi?er, the rapidly settling particles at the
bottom of the classi?er tank builds up an extra load
‘against the spiral conveyor, consequently to remove this
extra load from the tank, the electric motor 25 which
drives the spiral conveyor unit 2 draws an excess of
electric current, this excess electric current is registered
in the switch box 47 to start the pump motor_‘46 by
way of the electrical leads 48. By this operation the
2,872,042
5
6
spiral conveyor is then lifted a few inches out of the
excess settling at the bottom of the tank, the electrical
current to the motor 25 returning to normal the pump
motor 46 is stopped, whereby the lifted spiral conveyor
2 gradually lowers itself to its normal operating posi
tion along the bottom of the tank by means of the slow
leak valve 49 as the excess load is gradually removed.
The overloading of the classi?er feed circuit happens
only occasionally and lasts for but a short time, this
automatic lifting device is an e?ective counter measure
against stoppage and breakage of the classi?er, effecting
.
Referring to Figure 11 which is a modi?ed structure
of the head-motion in casting or sheet metal stamping
for the gear casing, the main bearing 22 is formed in
support by the gear casing 24, lugs 52 are cast with
the back half of the gear casing and are bored to ?t
the axle through bar 53 providing the means upon which
the head-motion until 1 is tiltable.
Without further analysis, the foregoing will so fully
reveal the gist of my invention that others can by apply
ing current knowledge readily adapt it to various appli
cations without omitting features that, from the stand
point of prior art, fairly constitute essential character
istics of the generic or speci?c aspects of the invention
a saving in operating cost that otherwise would have
cost considerably. I wish to be understood I do not
claim any electrical switches or circuit as such switches
and are intended to be comprehended within the mean
and circuits are well known for other applications. 15 ing and range of equivalence of the following claims.
High pressure from the valve box pump 42 (see Figures
This application is an improvement to my invention
1 and 3 in connection to Figure 13) is delivered to the
patented May 21, 1929, No. 1,714,007, the embodiments
lift cylinder 35 by way of the high-pressure supply
of the invention in which an exclusive property or privi
pipe 43 indicated by directional arrow and union cou
lege is claimed are de?ned as follows.
pler 54. High pressure air follows the channel 55 to 20 I claim:
enter the valve chamber 56 over the top of the valve
1. In a classi?er having a longitudinally inclined tank
head 57, at a velocity and volume in excess to the free
through which a liquid medium charged with solids of
?ow capacity of the channel passage 58 discharging
?nely crushed ores of different settling rates'to be classi
into the lift cylinder 35 under the piston head 59.
?ed moves, said tank being open at its top and formed
Consequently the air volume and pressure delivered to 25 with a transversely curved bottom, a ribbon spiral con
the valve chamber 56 forces the valve head 57 down
veyor and conveyor shaft longitudinally journalled in
ward against the spring 60 to seat the valve stem 61 in
bearings at its upper and lower end so that the outer
shut condition across the slow leak air passage 62, after
periphery of said spiral will operate in close spaced
which the full supply of high pressure air passes to the
relation with the bottom to remove the settled material
lift cylinder from the valve chamber to force the piston 30 along the inclined bottom and out of the tank while
head upwardly and consequently the spiral conveyor 2.
Upon raising the conveyor out of the overload the
the solids held in suspension by the liquid is provided an
over?ow at the lower end wall of said tank in elevation
flow of electric current to the pump motor 46 is stopped,
above the spiral conveyor, an elevationally movable
which stops the'valve box pump 42 and high pressure
bearing for the lower end of said conveyor shaft sup
air supply to the valve chamber 56. As the ‘spring 60 35 portingly mounted submerged on the lower end wall of
at all times tends to force the valve head 57 upward
against stop 63, this action takes place immediately, the
flow of high pressure air supply is stopped and conse
quently the valve stem 61 clears the slow leak air
passage 62 to slowly drain the air under the piston head
59 out of the cylinder 35 by reverse flow back through
the air passage 58 into the valve chamber 56 and out
the tank with the upper end of said conveyor shaft main
bearing supported in operating engagement with the mo
tivating mechanism of the head motion for rotation there
by; the combination with said main bearing supported
in elevation considerably spaced in vertical alignment
above a transverse axle member upon which said head
motion rocks, a perpendicularly disposed automatically
the opened slow leak passage 62 to discharge out of the
controlled air lift cylinder a?ixed to the exterior bottom
apparatus at junction T 64. The needle valve set
surface of the tank and projecting up into the tank ad
screw 65 adjusts the rate of air that may escape through 45 jacent the lower end wall of the classi?er, a cylinder
the slow leak air passage, which adjustment is for the
shaft in vertical extension slidable within said cylinder
required rate of lowering of the spiral 2 to its normal
to have the upper end thereof affixed in operating engage
working position.’
ment with said elevational movable means provided for
Again referring to Figure 13, it is to be noted the
the lower end of said conveyor shaft, whereby air pres
entire slow leak valve assembly may be removed by a 50 sure within said cylinder imparts an upward thrust and
wrench upon the nut head 66 which unscrews the as
downward movement to the lower end of the spiral
sembly at the threads 67, while the entire air lift cylinder
conveyor that also rocks the head motion unit upon the
base 68 unscrews from the lift cylinder 35 at the
axis provided by said transverse axle member.
threads 69.
2. Apparatus according to claim 1 wherein the air
The independent hydraulic lift system for the spiral 55 lift cylinder for the lower end of the ribbon spiral con
conveyor is operated by way of the motor 46, which is
veyor includes, said air cylinder locationally disposed
actuated by manual control in the operation of the pump
submerged within the liquid bath and projecting up
42 acting upon a ?ow of ?uid entering the pump through
from the bottom of the tank adjacent the lower end
the valve and pipe 50 and delivered through the pipe
wall of the classi?er, a slidable cylinder shaft one end
passage 51 into the lift cylinder 35, for thrust in raising 60 of which is attached to a piston within the cylinder with
the spiral conveyor. This hydraulic lift system is for
the opposite end thereof elevationally engaging the lower
holding the spiral conveyor in a raised position for long '
end support for the bearing and spiral conveyor shaft,
periods. To lower the spiral conveyor the trapped ?uid
within the cylinder let out in return to its reservoir
high pressure air supply to said cylinder acting upon
the piston in an upward thrust upon said cylinder shaft
by way of a standard manually operated valve provided 65 by which the ribbon spiral conveyor is raised in eleva
for that purpose.
_
It is thought that the construction, operation, utility,
and advantages of the invention will now be clearly
understood by those skilled in this art without a more
tion out of the classi?er overload for continuous
rotation thereof, and lowered through the medium of
reducing air pressure against the piston by means of a
slow leak valve in communication with the cylinder
detailed description. thereof. While I have illustrated 70 venting to the atmosphere the air trapped within said
and described the invention as embodied in the classi?er
I do not intend to be limited to the details shown, since
various modi?cations and structural changes may be
made without departing in any way from the spirit of
my invention.
75
cylinder for the downward movement of the spiral con
veyor, in a gradual removal of said‘ overload out of the
classi?er and return to normal operating conditions.
3. Apparatus according to claim 1, wherein the appli
cation of the automatically controlled air lift cylinder
2,872,042
8
,for .said ribbon spiral conveyor includes a valve'box pump
and almotorlby which the pump is actuated, said ,pump
providing means by which low pressure air supply is
raised to high pressure air delivered to the lift cylinder
OX
o?small diameter for raising a heavy spiral conveyor.
4. Apparatus according to claim 1 wherein the appli
cation ofthe motivated means for the airlift mechanism
includes an automatic air lift control system by which
the spiral conveyor is automatically raised and lowered,
said automatic system provided to operate through the 10
medium of an electric current, to start andstop the pump
motor as governed by the flow of excess current supplied
to the ‘spiral conveyor motor under overload conditions
'being registeredin the electric control-box.
References'Cited in the ?le of-this patent
UNITED STATES PATENTS
1,412,010
Akins ________________ __ Apr. 4, 1922
1,892,872
Daman ______________ __ Jan. 3, 1933
2,276,539
Finney ______________ __ Mar. 17, 1942
2,355,851
Finney _____________ __ ‘Aug. 15, 1944
2,368,416
2,428,789
Holt ________________ __ Jan. 30, 71945
Dickson '_ ___________ __ Oct. 14, 1947
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