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Патент USA US2126031

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Aung. 9, 1938.
y2,126,031
POPP ET_AL
VIBRATORY SCREEN
Filed May
,28 , 1936
'1.16
2 Sheets-Sheetl l '
1
50% WJ
i;
35
l
Aug. 9, 193s.
W. H. POPPE‘TAL.
-
VIBRATORY SCREEN
Filed May 28, 193e
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ç 2,126,031
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2 sheéts-sheet 2
ATTORNEYS
2,126,031
„rented Aug. 9, 193s
¿UNITED 4STATES- PATENT' L4orifice
Walter H. Popp and Edward A. Ebert, ‘Buñalm
.
N
`
Application'May 28, 1936, Serial No. 82,287 _
12 Claims.` (C1. 209-326)
base A is rendered adjustable by'some suitable
This invention relates to a screen for separat
ing loose material into different grades of size,
and relates more particularly to a flat, inclined
. vibratory screen which is mounted on and is
5` driven by a single eccentric drive shaft.
The principal object ofthe invention is to pro
-vide a vibratory screen of this'character‘which
will require the use of only one eccentric drive
shaft and will, at the same time, be so arranged
as to hold the screen frame at any desired angle
of inclination without permitting .the` screen
frame to be >subjected tol periodic vibrations or
unbalanced forces. Numerous other collateral
objects of the invention and practical solutions
15 thereof are disclosed in detail in the herein pat
ent specification, wherein:
In the accompanying drawingsì» '
Fig. 1 is an. oblique top plan of'one form of our
invention, taken on line l--l, Fig. 2.
20
. Fig. 2 is a side elevation thereof.
Fig. 3 is a fragmentary, transverse and sub
stantially vertical section through one end of the
eccentric drive shaft, taken on line 3_3, Fig. 2.
' Fig. 4 is an enlarged, fragmentary, transverse
25 and substantially vertical section through one
means, but all of these particular features' of the
base mounting form no part of the present in
vention and hence have not been illustrated.
Secured by bolts 32 or otherwise to the top
faces òf said I beams 3|), are a pair of stationary
bearings >33 in which is suitably journaled an
eccentricshaft 34. The latter is provided at its
one end'with a belt` pulley wheel ,35 which is
adapted to be driven from an external source of 10
power in the usual and well known manner.
Formed integrally on the eccentric shaft 34„
intermediate of its stationary bearings 33, is a.
pair of eccentric collars 36, upon which are jour
naled a pair of bearing housings- 31. The latter 15
are preferably secured (by welding or otherwise)
to opposite ends of an alignment tube 3B. Said
bearing housings 3l are provided with annular
flanges 39 which are ‘suitably secured to aipair
of parallel, vertical, longitudinal side plates dll.
0
Said side plates lit are connected transversely to
gether by a number of suitable cross brace mem
bers and together constitute the main body of a
box-like, screen frame Bin which may be mount
ed one or more inclined screen cloths 4l, lill in 25
_
manner. In the here
end of the screen frame, levelling mechanism, ’ the usual and well known
in
drawings,
thescreen
frame
B is illustrated as
. taken on line _t--ß, Fig. 3.
„
Fig. _5 is a side elevation 'of a modified form of being of the double deck type, i. e., equipped with
an upper, relatively coarse-meshed, metal screen
the invention using only one aligning shaft.
_cloth 4I, and a lower, relatively fine-meshed,
Fig.
6
isa
fragmentary,
transverse,
and
sub
30
stantially vertical section, taken on line 6_6, metal screen cloth 4l Il. With such a double deck
arrangement, any loose material, suchas gravel,
Fig. 5.
Figs. 7 and 8 are fragmentary, longitudinal and coal, etc., when fed upon the feed or left end of
substantially horizontal sections thereof, taken the upper screen 4I will be separated into three 35
size, grades, -in the manner well known in the
35 on correspondingly numbered lines ofFigs. 5`> and
6, respectively.
«
screening art.
.
Fig. 9 is a side elevation- of another modified
form of the invention using only one aligning
shaft.
40
,
-
Fi'g. 10 is an enlarged, fragmentary, transverse
andA substantially vertical section thereof, taken
on line Ill-‘|0, Fig. 9.
'
'
Similar characters of reference indicate like
parts in the several figures of the drawings.
45
rigs.. 1.4
The base A'of the vibratory screen is con
structed of 'a pair of parallel I beams 30 which
are joined together by a pair of suitable cross tie
50 members 3l. Said base A is usually arranged at
an incline, as shown, and is suitably supported
in any desired manner such, for instance, as
upon a foundation arranged beneath the base, or
upon springs hung from suitable overhead rafters.
55 Usually, also, the angle' of inclination 0f said
,
The speed and accuracy of the separation of the
loose material eiïected by the vibratory screen
is, of course, enhanced by causing the screen .
frame B to vibrate relatively to its base ‘A, and
the present invention is solely concerned with
this movement and, in particular, with those
vibration factors which are effected by this
movement.
.
The load upon the eccentric collars 36 is ec-- 45
centric with respect to the concentric axis of ro
tation of the eccentric shaft 34. To'prevent this
unbalanced arrangement from causing vibrations
in the base A, said eccentric shaft is balanced
by two sets of counterweights 42 which are se
50
curedto companion flywheels 43. The latter are
keyed to the concentric portions-of the eccentric
shaft just outwardly lof the eccentric collars 36.
It will be noted that the counterweights 42 of
each iiywheel 43 are disposed on the inner face 55
' 2
enl
of the web of said flywheel and that their center
of gravity (neglecting the weight of the ñywheel)
latory movement imparted to the screen frame B
of the vibratory screen shown in the accompany
is radially in line with the center of its com
panion eccentric _collar 36. With this arrange
ing drawings is of a circular character, butthe
present invention is not confined to this particu
ment and with the use of a pair of counterweight
lar type of translatory movement and takes care
of any translatory movement whatsoever.
The reason why the present invention permits
sets 42, the dynamic unbalance of all forces act
ing on the eccentric shaft 34 is reduced to zero
and, as a consequence, any flexing of said eccen
tricshaft 34 is also reduced to zero, except that
due to the purely static load. Any dynamic un
balance of the central part of the eccentric shaft,
i. e. (the part intermediate of the eccentric collars
36) Ais eliminated by having this portion of the
shaft formed concentrically with respect to the
axis of the concentric end bearings 33 of said
shaft.
Any unbalance of the frame B, relatively to the
eccentric collars 36, is prevented by having the
axes of said eccentric collars so disposed as to
20 intersect the center of gravity of said4 frame B.
Hence the axis of these collars 36 may be termed
the center of gravity axis of the screen frame B.
The term frame, as here used, includes all of the
parts secured to or moving directly with the side
25 plates 40 of said frame.
Secured by cap screws 44 and 45 to the outer
face of the web of each I beam 3U is a pair of
torsional resilient bearings 46, the resilient ele
ment of said bearings being constructed either
30 of rubber, as shown, or of some other resilient
material, such as steel, formed in the shape of a
spiral or helical spring. It should be noted in
this regard, that the only reason for using resil
ient bearings at these and at other points on the
35 vibratory screen here disclosed is simply to pro
vide a simple form of bearing which Will not re
quire lubrication,--the resilient feature not being
necessary because of its resilience, per se.
In
other words, ordinary plain bearings or anti
friction bearings may be used at these and at
other points on the herein vibratory screen if so
desired, without affecting the action of the screen
frame B but only affecting the maintenance cost.
Journaled in each pair of bearings 46 at each
side of the machine is an aligning shaft 41. Se
cured to each aligning shaft, inwardly of each
of its pair of bearings 46, is a` crank arm 48 which .
projects inwardly and substantially horizontally
through a suitable aperture 50 formed in the
adjacent portion of the web of its companion I
beam 30.
translatory movement, and nothing but transla
tory movement of the screen frame B is as fol
lows:
10
'
When one end of the screen frame B moves in
any direction in a vertical longitudinal plane
relatively to the base- A, ~it actuates the upper
end of the link 52 at that-particular end of the
screen frame.
This movement causesy a move
15
ment of the crank arm pivot 5l of the companion
crank arm 48 and this, in turn, causes- the other
crank arm pivot 5l to move a similar amount and
lin a similar direction. Said crank arm pivots 5l
always lie in one straight plane intersecting the 20
axis of the aligning shaft 41, and, as the links 52
are of identical length, and as, furthermore, the
distance between the pivot studs 5_4 is the same
as the distance between the crank arm pivots 5l,
it follows that any vertical or horizontal move 25
ment of one end of the frame permits the other
end of said frame to move a like amount in a
similardirection. Any tendency, however, of the
one end of the frame B to move differently from
the other end of the frame, either in direction or 30
amount, is instantly resisted.
I,
. One of the particular features of this inven
tion is that any force tending to thrust the oneend of the screen frame B out of proper align
ment is carried in the form of a torsional stress 35
through the aligning shaft 41 to the other end of
said screen frame. The advantage of this fea
ture is that such an aligning shaft 41 is able to
carry very heavy loads, and yet oscillate back and
forth in consonance with the translatory move
ment of the frame B, without setting up any ap
preciable inertia or momentum forces which tend
to resist the oscillation. ' It is obvious, however,
that the most important forces to be considered
are the unbalanced moving forces and that there
fore, fairly satisfactory results may be obtained
if the aligning shafts 41 are journaled on the
screen frame B and the outer ends of the links 52
are pivoted to the base A.
l
Another vital feature connected with this con
struction of Figs. 1-4 is that each side plate 40 of
the screen frame'B is provided with an individual
crank"arm 48 (either through the resilient ball restraining shaft 41. The consequence of this
and socket joint shown, or otherwise) is a linkl feature of the construction is that the frame
52 whose upper end is connected by a resilient members which connect the side plates 40 may be
Connected to the crank arm pivot 5l of each
ball and socket joint 53, or other suitable means,
to a pivot stud 54 which is secured to the com
panion side plate 40 of the frame B. 'I‘he total
amount of movement of the screen frame B is
of extremely light construction, and yet any
wracking of the frame B, taken as a whole, ren
dered absolutely impossible. It is to be under
stood that the eccentric shaft 34 takes the brunt
60 ordinarily so small (frequently only a quarter of
of the dead load of the screen frame and its load,
an inch or less) that the use of a ball and socket ' while the restraining shafts 41 and their appurte
joint at the upper and lower ends of the links 52, nances only take care of any unbalanced condi
is not absolutely essential. Hence, if desired,
these ball and socket joints may be eliminated
65 entirely and flexible links 52 and flexible crank
arms 48 employed in lieu thereof, or both pivots
of the link 52 may be plain or anti-friction bear
ings disposed on axes parallel to the axis of the
70
Divot' stud 54.
By this arrangement, the screen frame B is
held at a fixed- angle of inclination relatively to
the base A, entirely irrespective of what Sort of
-translatory, movement may be imparted to said
frame by the eccentric shaft 34 or by any other
desired means. It is obvious that the only trans
` tion.
It is obvious from the foregoing that any peri
odic oscillatory vibrations of the screen frame B 65
about the axis of the eccentric collars 36 are
stopped at their very inception, although, in
actual practice, a very small amount of distor
tion of the restraining shafts 41 and their associ
ated parts is desirable for the purpose of cushion 70
ing any sudden heavy unbalanced force. It is
desirable, however, ‘that this distortion (which
would usually be of a resilient nature, even when
a shock absorber is used) is not so great as to set
up excessively large periodic vibrations of the
3
2,126,031
screen frame B about its axis, i. e. the axis of the
panion pivot stud 54, thereby placing the four
Aeccentric collars 36.
weights at four'percussion points of the screen
frame. The advantage of having separate
weights 55 instead of making the screen frame B
`
The' location `of the pivot studs 54 is of im
portance. In the first place, said pivot studs are
so located in the present invention that their axes
C and D lie in'one straight plane intersecting the
itself of heavy material,`is that in the former case 5
the screen frame is relatively light and may be
axis of the screen frame B. , This means that the
easily installed and the weights 55 supplied later,
pressures imposed upon said pivot studs 54 by the
links 52 and their associated parts, are balanced
whereas‘when. the screen frame itself is con
10 as far as the axis of the screen frame is concerned.
This means, in practice, that when the screen
frame B (including the side plates >4i), screen
y ` cloths 4i, 4I I, bearing housings, alignment tube
38 and all other parts which move directly there
15 with) has been carefully balanced on its axis, it
structed of very heavy material, the diiflculty of
installing it is considerably greater. The present 10
invention, however, includes eitherv one of these
methods of opposing the sudden loads imposed by
the loose material on the screen cloths 4I, 4H
during the upstroke of the screen frame B.
Figs. 5-8 ‘
- is not thrown out of balancewhen the links 52 are
This inexpensive `form of the invention is simi
lar yto the construction of Figs. 1-4 except that "
connected to said pivot studs 54.
~The location of said pivot studs 54 in a direc
tion lengthwise of the screen frame B is also of
20 importance when the eifect of a sudden unbal
anced load force is taken into account. If we
only one aligning shaft 41.! is employed. This
shaft is journaled on the -base ¿LI in bearings 46.| 20
consider only the one end of the screen, say for
instance the upper or feed end of the screen, we
find that a sudden unbalanced load will cause the
25 least shivering of this end of the screen, and of the
screen as a -whole, if the upper pivot stud 54 be
and are so constructed as to be horizontally ilexi-f ‘
ble. Each crank arm is provided with a ball and
socket crank arm pivot 5|.l which is located in a 25
vertical longitudinal plane located medially of the '
and is provided with a single pair of crank arms
48.! which extend under the screen frame B.|
located at point C about one-third inwardly from screen frame B.I and directly'under companion
the upper end of the screen measured from the ~ percussion pointsv E and F situated at the com
axis of the eccentric collars 36. This point is, in
eilîect, the percussion point for the feed end of
the s’creenframe B. The lower pivot stud 54 is
similarly located at a pointD at what may be
termed the percussion point for the discharge end
panion ends of screen frame.
of the screen frame B.
In" this construction. it will be noted that the
links 52 of Figs. 1-4 have been eliminated. 35
This is because the crank arm 48.I is so long and
its angular Iamount of oscillation so small that no
Ordinarily, of course,
35 levery moving object is considered to have only
one single percussion point with reference to a
certain axis of rotation. But this _is not strictly
true when distortion is taken'into consideration.
Furthermore, in the present invention, the use of
43 a single percussion point does not work in prop
erly with the other requirements of a single shaft
vibratory screenA and hence, each half ofA the
screen frame has been considered an individual
` entity, and has been provided with an individual
percussion point C and D to resist in the most
effective manner, any unbalanced force imposed
upon that particular end of the screen frame.
When the screen frame B is on its down stroke,
its speed of movement is greater than the down-`
50 ward Ispeed of theA loose material which is being
screened. Hence, the loose material is not a load
on the screen frame during the down 'stroke of
the screen frame. When, however, the screen
frame is on its up stroke, it is resisted by not only
Each crank arm
pivot 5|.I connects its companion crank arm with 30
a companion pivot stud 54.I which latter, in turn,
is connected to the screen frame B.| by a screen
frame cross beam 5.6.
'
‘
appreciable lateral movement of the crank arm
pivot 5| .I occurs as the ‘crank arm movesup and
down. ` Longitudinal movement of the crank arm 40
pivot 5I-;I is taken care of by the ñexible nature
of the crank arms 481„ In this construction said
crank arm pivot 5|.l is located directly in the
path of the descending loose material and hence
means have been provided to avoid excessive 45
abrasion of this pivot by the provision of a small
metal umbrella 51 secured to the cross beam 56
just above said pivot.
rigs. 9-10
50
. This form of the invention is similar to that of
Figs; 5-8 except thatv plain instead of rubber
bearings are employed and the crank arms 48.2
are pivoted to the aligning shaft 41.2. In other
the static load of the ~loose material but also by words, the single aligning shaft 41.2 is journaled 55
the `force of momentum of saidloose material due ‘ on the base A.2 on a plain bearing 46.2, while the
to the downward movement of said loose material. ‘hub of the crank arm 48.2 is journaled in a plain,
This may be compensated for in `various ways, vvertical bearing 58 on said aligning shaft, and the
but the preferred method of compensation is to outer end of the crank arm is connected by a
60 "take care of this downward force by having the plain ball and socket joint 5i.2 with the pivot 60
'screen frame rotated at a relatively high speed stud 54.2. Incidentally this construction proves
that the present invention does not require any
(which with the present invention is quite feasi
ble) and, in addition, having the‘s'creen frame and thing of a resilient nature.
the parts which move therewith of suñicient
We claim as our invention:
.
1. A vibratory screen comprising: a base; a 65
-65 weight that the `change of torque on the eccentric
-shaft 34, and the change of load‘on the stationary screen frame; means for gyrating said frame
relatively to said base in a vertical plane; an
bearings, is negligible. This supplying of ade
quate weight to the screen frame may be effected aligning shaft-,_journaled'on said base; a pair of
by either constructing the screen frame'B and its
70 associated working parts of very heavy material,
or it may be effected by providing special momen
tum weights 55. The latter are preferably se
cured to the outer faces of the side plates 4|] vof
the' screen frame, with the axis of each weight 55
75 arranged coincident with the axis of its com
spaced-apart arms rigidly secured to said align
ing shaft and extending horizontally outward 70
therefrom; anda vertical member m'ovably con
necting the outer- end of each arm with said
frame.
>
>
2. A vibratory screen comprising: a base; a
screen frame; means for positively gyrating said 75
4
2,126,081
frame relatively to said base in a vertical plane;
an aligning shaft journaled on said base; a pair
of spaced-apart arms rigidly secured to said
aligning shaft; and links connecting the outer
end of each arm with the screen frame.
3. A -vibratory screen comprising: a base; a
screen frame; a horizontal eccentric shaft jour
naled on said base and extending through said
frame substantially midway between the ends
10 thereof; means mounting said frame on the ec
centric portion of said shaft for positively gyrat
ing said frame relatively to said base in a ver
_tical plane; _an oscillating aligning shaft jour
naled on said base; a pair of spaced-apart arms
15 rigidly secured to said aligningshaft and ar
ranged on opposite sides of said eccentric shaft;
and links Alying in a generally vertical plane and
connecting each arm with said screen frame.
4. A vibratory screen comprising: a base; a
20 Screen frame; a horizontal eccentric shaft jour
naled on said base and extending through said
frame substantially midway between the ends
thereof; means mounting said frame on the ec
centric portion of said shaft for positively gyrat
25 ing said frame relatively to said base in a Vertical
plane; an oscillating aligning shaft journaled on
said base; a pair of spaced-apart arms connected
with said aligning shaft and arranged on opposite
sides of said eccentric shaft; and links each hav
30 ing a universal connection with the outer end of
each arm and the screen frame whereby said
frame is held at a. predetermined angle but is
otherwise unconstrained _by said aligning shaft
and links.
5. A vibratory screen comprising: a base; a
screen frame having vertical side walls; means
for gyrating said frame relatively to said base in
a vertical plane; aligning- shafts journaled on
said base at opposite sides of said frame and lying
40 in a plane perpendicular of the plane of move
ment of said frame; spaced-apart arms project
ing laterally from each of said shafts; and means _
movably connecting the outer ends of said arms
to a companion side Wall of said frame.
45
6. A vibratory screen comprising: a base; a
screen frame; means for gyrating said frame rel
atively to said base in a vertical plane; an align-.
ing shaft journaled on said base; a pair of
spaced-apart arms connectedwithsaidshaft;and
means movably connecting the outer ends of said
arms with the frame„ said means lying in a gen
erally vertical plane which is centrally disposed
relatively to the screen frame. 5
'1. A vibratory screen comprising: a'base; a
55 horizontal eccentric shaft journaled on said base';
a screen frame journaled on the eccentric por
tion of said shaft; an alignment shaft journaled
on said base and having a pair of arms which
project substantially horizontally; and means
movably connecting the outer ends of said arms
with the frame.
8. A vibratory screen comprising: a base; a
horizontal eccentric shaft journaled on said
base; a screen frame journaled on the eccentric `
portion of said shaft; a pair of alignment shafts
journaled on said base on opposite sides of said
frame; a pair of arms projecting laterally out
ward ~from each of said aligning shafts; and 10
‘means movably connecting the outer end of each
of said arms with said frame.
9. A vibratory screen comprising: a base; a
horizontal eccentric shaft journaled on said base;
a screen frame journaled on the eccentric'por
tion of said shaft; an alignment shaft journaled
on said base and having a pair of arms which
15
project substantially horizontally; and means
movably connecting the outer ends of said arms
with the frame and lying in a plane parallel to 20
the plane of movement of said frame.
10. _A vibratory screen comprising: a base; a
horizontal -eccentric shaft journaled on said base;
a screen frame journaled upon the eccentric por
tion of said eccentric shaft; a screen cloth ar 25
ranged in said screen frame; an alignment shaft
journaled on said base perpendicularly of said
drive shaft; a pair of parallel‘arms arranged at
opposite ends of said alignment shaft;I and uni
versal meansv connecting the outer ends of said
arms with the frame.
30 "
'
11. A vibratory screen comprising: a base; a
screen frame; a transverse eccentric shaft jour
naled on said base substantially midway between
the ends of said screen frame; an oscillating 35
aligning shaft extending longitudinally of said
screen frame and journaled on said base; arms
rigidly secured to said aligning shaft and near
the ends of said screen frame; and vertical links
each having a universal connection at one end 40
With a corresponding arm and each having a
universal connection at its opposite end With'said
screen frame.
l
'12. A vibratory screen comprising: a base; a
screen frame; a transverse eccentric shaft jour
naled on said base *substantially midway between
the ends of said screen frame; an oscillating
aligning shaft extending longitudinally of said
screen frame and journaled on said base; arms
rigidly secured to said aligning shaft and near 50
the ends of said screen frame; and vertical links
each having a universal connection at its- lower
end‘with a corresponding arm and each having
a universal 'connection at. its upper end with
said screen frame.
_
WALTER H. POPP.
EDWARD A. EBERT.
55
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