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Патент USA US2122475

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July 5, 1938.
N. M; KNIGHT
2,122,475
PULP SCREENING IACHINE
Filed Jan. 3, 1956
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July 5, 1938.
N. M. KNIGHT
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2,122,475
PULP SCREENING IACHINE
'Filed Jan. s. 1936
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Nelson M_Knighï
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PUL? SCREENING “CHINE
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Patented July 5, 193i'
2,122,475
UNITED' STATES PATENT OFFICE
2,122,475
PULP >SGREENI'I‘ÍG MACHINE
Nelson M. Knight, Weymouth Heights, Mass. A
Application January 3, 1936. Serial No.'57,378
17 Claims. (Cl. 92-34)
This invention relates to pulp screening ma
chinesand particularly to machines of the type
illustrated in my Patent No. 2,003,150, dated May
28, 1935.
`
The pulp screening machine shown in said
patent comprises a casing having an inlet for
unscreened pulp and an outlet for the screened
pulp,»a screen within the casing through which
the pulp passes as it flows from the inlet to the
10 outlet, said screen having a plurality of baille
plates rigid therewith, and pulp-pulsating plates
situated between the baille plates and movable
toward and from the latter, the movement of
cleaning runners are provided on the inlet side
of the screen which are given a rotative move
ment about the screen for the purpose of assist
ing in keeping the screen clean.
Another feature of my invention relates to an
5 -
-improved construction of the screen-cleaning ele
vment.
,
Another feature of the invention relates to an
improvement in the means for giving the simple
harmonic movement to the pulsating plates by
which the amplitude of vibrating movement of
the plates may be readily changed from the ex
terlor of the machine.
l
the pulsating plates relative to the baille plates l
Other features of the invention relate to vari
15 serving to force the pulp back and forth through ous improvements in pulp screening machines
the screen as it flows from the inlet toward the which will be more fully hereinafter set forth and
will then be pointed out in the appended claims.
outlet.
InA the device of said patent the pulp-pulsating '
In the drawings:
plates are given their vibrating movement by an
Fig. 1 is a vertical sectional View through a
eccentric, as a result of which they have a simple pulp screening machine embodying my invention. _
Fig. 2 is a section on the line 2-2, Fig. l.
harmonic movement, the movement of said pul
sating plates relative to the baille plates being
Fig. 3 is> a view showing one section or unit of
relatively slow'at the beginning and ending of the screen-cleaning element construction.
each stroke and relatively rapid at the mid portion
Fig. 4 is a View of the driving mechanism for
the pulsating plates and the runners with parts
of the'stroke.
This _uneven relative movement between the . brokenout to better show the construction.
pulsating plates and the baille plates produces an
Fig. 5 is a section on the line 5_5, Fig. 4.
Fig. 6 is a side view of the pulp screening ma-.
uneven pulsation of the pulp through the screen,
and as the pulsating plates are vibrated relatively chine with one of the plates of the casing re
30 rapidly, such uneven motion subjects both sets moved to give access to the screen-cleaning ele
of plates to considerable strain.
~It is one of the objects of the present inven
tion to provide a novel construction by which a
more even relative movement Vwill be produced
35 between the pulsating plates and the baille plates
notwithstanding the fact that the pulsating
plates have the simple harmonic motion result
ing from being actuated by an eccentric or crank.
This end is accomplished by providing screen
40 supporting means _which permits the screen to
yield slightly in the direction of the movement
of the pulsating plates so that as the speed of
movement of the pulsating plates increases from
the beginning of each stroke to the center there
45 of the pressure to which the baille plates are sub
jected will cause a yielding movement of the screen
in the same direction as that of the pulsating
plates, although of less extent, with the result
that the relative movement between the two sets
50 of plates will be a much more even and uniform
movement than where the baille plates are ñxed
or stationary ’as in the device illustrated in
said patent.
`
'
In said patent the pulp screen is shown as
a cylindrical screen and a plurality of screen
ment.
'
'
Fig. 7 is an enlarged fragmentary sectional
view showing the operation of the resilient sup
port forthe screen.
l
Figs. 8 and 9 are diagrammatic views illus
trating the manner in which the eccentric for op
erating the pulp-pulsating plates can be _adjusted
to vary the amplitude of movement.
Fig. 10 is a fragmentary perspective view show
ing a detail of the sectional shaft 29.
40
Fig. 11 is a fragmentary view showing the two
sections of the shaft 29 connected together.
In the drawings I indicates generally the cas
ing of the machine which is shown as a ver
tical cylindrical casing having an upper head 45
2 provided with an inlet 3 for the unscreened`
pulp and also provided with the lower head 4
having a discharge 5 for the screened pulp. This
casing is supported on suitable legs or supports
i‘and the upper head 2 has attached thereto a
bearing member 1 having the inlet passage 8
through which the unscreened pulp is delivered
to the inlet 3.
The casing I may be made in any appropriate
way and as herein shown it comprises a plu- 55
2
2,122,475
rality of curved plates 9 which are connected to
ber 1. The motor shaft 34 has a belt pulley 35
vertically-extending post members I Il, there be
ing four of these post members and consequent
thereon which is belted to a pulley 36 on
ly four plates 9. 'I‘he posts are shown as hav
'il ing a channel-iron shape and the plates 9 have
ilanges II at their vertical edges which mate
and are clamped to the flanges of the channel
iron posts I0 by means of clamping bolts I2. With
this construction the interior surface of the cas
ing I is formed partly by the plates 9 and partly
by the inner faces of the posts I8.
The screen which is situated Within the cas
the shaft 29 through the medium of a driving
belt 31. The upper head I4 of the screen has
a bearing 38 through which the spindle 22 ex
tends. The spindle 22 is keyed to the bearing
sleeve 26 through the medium of a key 94. The
ends of the key are provided with- fingers 93
which engage the bearing and thus retain the
key in place. The key-94 permits vertical re
ciprocation of the spindle 22 but prevents rota
tive movement thereof.
ing is indicated at I3 and it is shown as having
As stated above the motion given to the pulsat
a cylindrical screening wall which is connected at
ing plates I8 by the eccentric 28 is a simple
its upper end to an upper non-perforated screen
head I4 and at its lower end to a lower screen
harmonic motion in which the movement of the
head I5 that is provided with an outlet opening
each stroke is relatively slow while the eccen
tric is leaving or approaching the dead center
and is relatively rapid while the eccentric is mid
way between the two dead centers. If the baf 20
fle plates Vare stationary this uneven movement
I6 registering with the discharge opening 5. the
discharge opening I6 thus communicating with
the interior of the cylindrical screen.
The un
pulsating plates at the beginning and ending of
screened pulp thus flows into the casing and
through the screen I3, thence through the out
of the pulsating plates causes an uneven pulsa- y
let I6.
tion of the pulp through the screen plate and
The screen I3 has a plurality of baille
plates I'I rigid therewith and preferably extend
ing at right angles to the screen wall and situ
ated between these baiile plates are pulp-pulsat
ing plates I8 mounted for movement toward and
from the baille plates. This relative movement
causes
of the the
pulsating
pulp to plates
be pulsated
I8 and
or forced
baille plates
back and
forth’through the screen as it flows frein the in
let to the outlet inthe manner described in my
above-mentioned patent'. In the construction
herein shown the baille plates I‘I are annular
it plates situated on the inside or delivery side of
the screening wall I3 and are rigidly connected
at their periphery to said screening wall. These
plates -are held spaced from -each other by means
of spacing elements I9 and the spacing elements
furthermore subjects the baille plates to a con
siderable strain at the time that the pulsating 25
plates have their highest speed of movement.
In order to produce a more even relative move
ment between the pulsating plates and the baille
>plates and thereby to relieve the plates from this
undue strain and also to cause a more even pul
30
sating movement of the pulp through the screen,/
I propose to so mount the screen that it can yield
or give in the dire-ation in which the pulsating
plates are moving as the pressure against said
badle plates increases due to the increasing speed 35
of movement of the pulsating plates at their
mid-stroke. Various ways of thus mounting the
screen to provide for this yielding movement may
be employed without departing from the inven
One simple expedient is herein shown
which is especially adapted for a screen pulp in
40 are retained in position by means of tie rods Ition.
2U which extend through the spacing elements
and tie the upper and lower heads I4 and I5
which the scre‘en has a vertical arrangement. Y
together. The spacing elements I9 extend
through apertures 2l formed in the pulsating
This means comprises yielding supports on which
the screen rests and which are capable of yielding
te' allow a slight downward movement ef the 45
screen during the downward movement of the
pulsating plates and which provide for a corre
plates I8.
The pulsating plates are rigidly se
cured to an axially-situated spindle 22 as in
the above-mentioned patent. This spindle has
two sets of radially-extending arms 23, each set
of arms carrying one of the pulsating plates
I8. The other pulsating plates are rigidly con
nected to these two pulsating plates by means
of tie rods 24 which extend through all of the
60
sponding upward movement' of the screen during
the upward movement oi the pulsating plates,
the movement of the screen in each direction,
however, being less than that of the pulsating
plates so that the required relativev movement
pulsating plates and which tie together the top ` will be produced rbetween the pulsating plates and
and bottom plates, and spacing elements 25 baille plates. In the construction herein shown
through which the tie rods pass and which hold the screen is supported on a plurality of spherical
the pulsating plates properly spaced. These spac , supporting elements 39 in the forniv of rubber balls
ers 25 extend through openings formed in the which rest in seats 48 mounted onfthe lower cas- f
baille plates I1 as described in the above-men
ing head 4. The lower head I5‘of the screen is
tioned patent.
provided with seat members 4I having on their
The lower end of the spindle 22 is mounted
for axial reciprocation in a bearing 26 carried by
the lower head I5, said bearing being supported
in a hub s2 of a spider member integral with
the head I5 and having radial arms 2'I, the space
65 between the arms forming the outlet passage I6.
This spindle 22 is connected at its upper end
to an eccentric 28 on a drive shaft 29 that is
mounted in suitable bearings carried by the bear
ing member 1. 'I’he eccentric 28 has the ‘usual
eccentric strap 38 which is connected to the spin
die 22 through the arms or links 3l.
The shaft 29 may be driven in any suitable
way and as herein shown power for .driving the
shaft is furnished from a suitable motor 32 car
ried on a bracket 33 secured to the bearing mem
under faces spherical recesses to receive the balls 60
39. These seat members 4I _are shown as re
tained in position by the tie rods 28, said tie rods
being screw-threaded at their _upper ends into
the upper screen head I4 and extending through
the lower screen head I5 and being screw-threaded
into the >seats 4I. The head I5 lis provided with
a'tubular neck portion 42 which ñts within an
opening formed in the lower casing head 4, said
neck being capable of axial movement through 70
the opening. 43 indicates a bearing of Babbitt
metal or other similar material to provide a tight
slip joint and 44 indicates a ring of rubber or
other yielding material which surrounds the neck
42 and is confined between the lower head 4 of the 75
3
2,122,475
casing and a shoulder 45 formed on the lower head
I5 of the screen.
80 indicates a spring encircling the spindle 22 ,
situated between the hub 82 of the spider 21 and
the hub 8l of the lower set of arms ‘23. This
spring will preferably be under some compression
when the pulsating plates are at the highest point
in their travel and during each downward move
ment of the spindle 22 said spring will be com
10 pressed somewhat.
`
'I’he upper head I4 of the screen carries a
cushion member 4G of rubber which is shown as
faced with a metal plate 41, the latter having
bearing against the hub portion' of a rotating
15 runner-carrying member 48 by which lthe rotary
runner above-referred to and presently to be
described is supported.
With this construction assuming that the ec
ward movement of the pulp-pulsating plates the
screen will have a slight downward movement
and such downward movement ofthe screen‘wlll
occur largely while the pulp-pulsating plates I8
are moving Amost rapidly at the middle portion of
their stroke.
As the operating eccentric 28 passes its low
center and thepulp-pulsating plates begin to
move upwardly, the pressure of the spring 80 will
gradually be relaxed and the resiliency of the 10
rubber supports >39 will cause the screen and
baille plates to move upwardly again during the
upward movement of the pulp-pulsating plates.
'I'he spring 80, together -with the cushion member
46, serves to cushion the upward movement of 15
the screen.
With this construction, therefore, the screen
itself has an up-and-down movement along with
centric 29 is on its upper dead center then the\ the up-and-down movement _of the pulp-pulsat
20 runner plates and baffle plates will have the rela
tive position shown in full lines in Fig. "I, the
pulsating plates being relatively close to the baffle
plates above themy and at a maximum distance
from the baille plates below them. ~As the pul
25 sating plates are moved downward by the eccen
tric 28 the speed of downward movement in
creases progressively from zero at the starting
point to a maximum speed at the mid-stroke and
then decreases progressively from the mid-stroke
30 to the lower end of the stroke. As the pulsating
plates move downwardly the pulp between each
pulsating plate and the baille plate below it is
subjected to pressure tending to force the pulp
outwardly through the screen and at the same
35 time a suction will be produced between each pul
sating plate and the baille plate above it tending
to draw the pulp inwardly through the screen. As
each pulsating plate moves upwardly the pulp be
Ltween it and the baffle plate immediately above
40 will be subjected to pressure, tending to lforce the
pulp outwardly through the screen while a suc
tion will be produced beneath each pulsating plate
tending to draw the pulp inwardly through the
screen, this being the same operation as that
described in my above-mentioned Patent No.
ing plates, although the amplitude of the move 20
ment of the screen and baille plates is less than
that of the pulsating plates. This construction
provides a relatively even relative movement be
tween the pulp-pulsating plates and baille plates
notwithstanding the simple harmonic movement
of the pulp-pulsating plates.
The screen-cleaning element which rotates
about the exterior of the screen for keeping the
latter clean is indicated generally at 49, and as
stated above it is carried by a rotating disk or
support 48. This support 48 is secured to the
lower end of a sleeve 50 which extends through
and has bearing in the bearing member 1 and is
provided at its upper end with a worm` gear 5I
which meshes with and is driven by a worm
52 on a shaft 53 that is mounted in suitable bear
ings 54. This shaft 53 has a sprocket wheel 98
thereon which is connected by a sprocket chain
55 to a sprocket wheel 56 on the shaft 29, this
construction being similar to that shown in my 40
above-mentioned patent.
.
The screen-cleaning element 49 is formed with
a plurality of spirally-arranged runners 51, and
it is divided vertically at 9I into separate units,
any one of which is of a size to be removed 45
through the space provided when any one of the
plates 9 is removed. Each section or unit of the
With the construction herein‘illustrated dur
ing the downward movement of the pulsating screen-cleaning element is made up of a plurality
plates the downward pressure produced on the of runner sections 51 having an inclined or spiral
arrangement shown in Figs. 3 and 8, the runner 50
50 baille plates through the medium of the pulp to
gether with the pressure applied to the lower sections of any unit being _tied together by means
head I5 of the screen through the spring 88 will - of tie rods 58. Each runner sectionA is formed
with two bosses 59 through which the tie rods 58
cause the yielding supports 39 to yield downward
ly, thus permitting the downward movement of extend and these bosses 59 are of sufiicient length
the screen as a unit, as shown in Fig. 7, wherein so that they hold the runners properly spaced
the full lines show the relative position of the from each other. The upper end of each tie rod
pulsating plates and the baffle plates when the 58 is screw-threaded into the lower end of a nut
pulsating plates are at the upper end of their 60 and the lower end of each tie rod screws into
stroke, and the dotted line positions represent another nut 6I. The nuts 60 at the upper end of co4
the tie rods are detachably secured to the plate
co, the position of the pulsating plates during their or
disk 48 by’means of clamping screws 82. 83
downward movement and the corresponding po
sition which the screen and the baille plates have indicates a ringwhich is clamped to the under
due to the downward pressure thereon and the side of the lower nuts >IiI by means of clamping
screws 84.
,
fact that the screen is yieldingly supported.
The separate sections or units of the screen 65
As the pulp-pulsating plates I8 move down
wardly from the full line position toward the cleaning element preferably have a circumfer
» 2,003,150,
dotted line position they subject the pulp be
ential dimension `slightly less than that of any
tween them and the baille plates below them to plate 9, and as herein shown the screen-cleaning
pressure which istransmitted to the baffle plates. element is made up of live of such units.
If it is necessary or desirable to remove any 70
This pressure not only causes the pulp to be
_
unit
of the screen-cleaning element this can be
forced outwardly through the screen but cooper
ates with the downward pressure against the easily done by removing one of the plates 9 and
screen through the spring 8D to cause the resilient then backing off the screws 62 and 64 for said
or yielding balls 39 to yield downwardly, as- shown unit until the screws are free from the nuts SII
and 6I. When this has been done the unit can
75 in dotted lines, Fig. 7. Hence, during the down
4
2,122,475
be removed as a single structure because the
runner sections 5l remain clamped together by
the tie rods 58 and the nuts 60, 6|. This con
struction facilitates the assernbly of the device
as Well as any necessary repa1rs.
The machine herein shown also provides means
plitude of movement of the pulsating plates.
When the desired adjustment has been effected
the clamping bolt 69- is tightened thereby clamp
ing- the sleeve 65 to the shaft 29 in its adjusted
position.. The fact that the clamping bolt 69 is
accessible from the end of the shaft facilitates
by which the amplitude of vibrating movement -greatly'the operation of making the desired ad
of the pulsating plates I8 can be Varied, this justment in the eccentric.
being accomplished by varying the eccentricity of
I claim.
'
10 the operating eccentric 28. The eccentric 28 is
a double eccentric having the two eccentric por
tions and two eccentric straps 30, as shown in
Fig. 4, 4each eccentric strap being connected
through a link 3| to the spindle 22. These ec
15 centrics 28 are formed on a sleeve 65 which is
mounted for rotation on an eccentric portion 66
of the shaft 29 and is adapted to be clamped to
1. A pulp screen comprising a casing having 10
.an intake for unscreened pulp and an outlet for
screened pulp, a vertical screen situated between
-the inlet and outlet and through which the pulp
flows, said screen having baille plates extending
therefrom, pulp-pulsating plates situated between
the baille plates, means to move the pulsating
plates toward and from the baille plates, thereby
said shaft in different angular positions.- The- causing the pulp to be forced back and forthv
shaft 29 is a divided shaft and comprises the sec-`“
through the screen as it flows from the inlet to
'the outlet, and a support for the screen yieldable 20
and the section 29h to which the sprocket wheel `in the direction of movement of the pulsating
56 is secured, the division between the sections plates.'
being wtihin the eccentric sleeve 65 so that the
2. A pulp screen comprising a casing having an
eccentric portion 66 of the shaft is formed partly intake for unscreened pulp and an outlet for
25 on the section 29a and partly on the section 29h.
screened pulp, a screen situated between the in
20 tion 29a to which the driving pulley- 36 is secured
The’two sections 29a, 29h are coupled together
to rotate as a unit through the medium of a
coupling member 6l which is received in slots 98
formed in the adjacent ends of the two shaft
30 sections.
Means are provided which are accessible from
the end of the shaft for clamping the eccentric
sleeve 65 to the shaft or unclamplng said sleeve
from the shaft whenever it is desirable to adjust
35 it to change the amplitude of vibration of the pul
sating plates. This eccentric sleeve 65 is confined
between two flanges 68 formed on the two shaft
sections 29a, 29h and the shaft section 29D has a
clamping bolt 69 extending axially thereof which
40 extends through the coupling member 61 and
screws-into the end of the shaft section 29lb as
'shown at 10. The shaft sections are spaced
slightly from each other at the adjacent ends and
the coupling member 61 is of a size to permit a
45 slight movement of the shaft sections toward each
other. When the clamping bolt 69 is tightened
the two shaft sections are drawn toward each
other thereby clamping the eccentric sleeve 65
firmly between the flanges 68. W'hen the two ec
centrics 28 and 66 are adjusted so that the eccen
tricity of each is on the same side of the axial
line of the shaft, as shown in Figs. 5 and 8, then
the amplitude of movement of the pulsating
plates will be that given by` the two eccentrics
combined. On the other hand, if the two ec
centrics 28 and 66 are adjusted so that they op
pose each other then the amplitude of movement
of the pulsating plates will be that resulting from
the difference between the throws of the two ec
centrics, and if the two eccentrics have the same
throw then by adjusting them so that they op
pose each other the rotation of the shaft 29 will
produce no vertical movement in the spindle 22.
Whenever it is ‘desired to make an adjustment in
65 the amplitude of movement of the pulsating
plates the clamping bolt 69 is lbacked off suiil
ciently to relieve the clamping pressure on the
eccentric sleeve 65 and the operator then turns
the shaft 29 through the medium of the wheel
16. The friction of the eccentric straps 30 on the
eccentrics 28 will hold the latter from turning
with tho shaft 29 after the eccentric sleeve 65
has been unclamped so that by turning the shaft
29 the two eccentrics can be adjusted into any
75 desirable relative position to give the desired am
let and outlet and through which the pulp flows,
said screen having baille plates extending there
from, pulp-pulsating plates situated between the
baille plates, means to move the pulsating plates'
toward and from the baille plates, thereby caus
ing the pulp to be forced back and forth through
the screen as it flows from the inlet to the outlet,
and resilient support for the screen yieldable in
the direction> of movement of
plates.
the pulsating
:
3. A pulp screen comprising a casing having
an intake for unscreened pulp and a screened
pulp outlet, a screen situated between the inlet
and outlet, said screen having baille plates ex
tending therefrom on the delivery side thereof, 40
pulp-pulsating plates situated between the baf
ile plates, means to move the pulsating plates to
ward and from the baille plates, thereby caus
ing `the pulp to be forced back and forth through
the screen as it flows from the inlet to the outlet, 45
said screen being movable in the direction of
movement of ‘the pulsating plates, and resilient
means to resist such movement of the-screen.
4. A pulp screenv comprising a casing having a
pulp inlet and a screened-pulp outlet, a screen
situated between the inlet and outlet, baille plates
rigid with the screen, pulp-pulsating plates sit
uated between the baille plates,`means to move the
pulsating plates toward and from the baille plates,
thereby causing the pulp to be forced back and 55
forth through the screen as it flows from the
inlet to the outlet, and means for supporting the
screen which permits it to have a limited move
ment in the direction of- movement of the pul
sating plates.
5. A pulp screen comprising a casing having a
pulp inlet and a screened-pulp outlet, a screen
situated between the inlet and outlet, baille plates
rigid with the screen and extending therefrom,
pulp~pulsat-ing plates situated between the baille 65
plates, means to move the pulp-pulsating plates
toward and from the baille plates, thereby caus
ing’the pulp to be forced back and forth through
the screen as it ñows from the inlet to the outlet,
and a support for the screen yieldable in the di 70
rection ofthe movement of the pulsating plates.
6. A pulp screen comprising a casing having a
pulp intake and a screened-pulp outlet _a cylin
drical screen within the casing, baille plates rigid
with the screen and situated on the delivery side 75
ES`
2,122,475
thereof, pulp-pulsating plates situated between cleaning velement being divided in a, plurality of
the baille plates, means to vibrate the pulsating ' places along lines -substantially parallel to the
plates toward and from the baille plates, and tie rods of the cylindrical screen thereby to form
yielding means supporting the screen and per
separate screen sections, there being atleast one
mitting limited movement thereof in the direc
of said tie rods in each section, a rotary support
tion of vibration of the‘pulp-pulsating plates.
ing member coaxial with the screen at one end
'7. A pulp screen comprising a.A casing having a thereof, means to rotate said member, and means
pulp inlet and a screened-pulp outlet, a contin
for independently attaching each section of'the
uous-walled screen within the casing through screen-cleaning element to said supporting mem
which the pulp ñows inwardly, baille plates rigid
ber.
ly secured to the screen on the inside thereof,
13. A pulp screen comprising a casing having
pulp-pulsating plates between the baille plates,
an inlet and an outlet, a cylindrical screen
means to vibrate the pulp-pulsating plates to
ward and from the baille plates, and yielding
screen-supporting means permitting yielding
through which the pulp flows inwardly, a rotary
screen-cleaning element encircling the screen,
movement of the screen in the direction of move
ment of the pulp-pulsating plates.
said element comprising a plurality of runners
spiralling about the screen, each runner having
a plurality of apertured bosses, tie rods extend
8. A pulp screen comprising a casing having a ing through said bosses and rigidly connecting
pulp inlet and a screened-pulp outlet, a screen the runners, nuts screw-threaded to the ends of
20 within the casinghaving a vertical screening -each tie rod and by which the runners are 20
wall, baffle plates rigidly secured to the screen
on the delivery side thereof, pulp-pulsating
plates situated between the baflle plates, means
to vibrate the pulp-pulsating plates in a/vertlcal
25 direction, and a vertically-yielding support for
the screen.
9. A pulp screen comprising a casing having an
intake for unscreened pulp and an outlet `for
screened pulp, la screen situated between the in
30
let and outlet and through which the pulp flows,
said screen having baille plates extending there
from, pulp-pulsating plates situated between the
baille plates, means to move the pulp-pulsating
plates toward and from the baille plates, thereby
causing the pulp to be forced back and forth
through the screen as it flows from the inlet to
the outlet, a yielding support for the screen and
a spring interposed between said screen and the
pulp-pulsating plates and resisting relative move
40 ment in one direction between said plates and
screen.
clamped together, a rotary supporting member
coaxial with the screen, and bolts carried by said
supporting member and screw-threaded into the
nutsat one end of the screen-cleaning element
thereby securing said element to said supporting 25
member.
.
14. A pulp screen comprising a casing having
an inlet and an outlet, a cylindrical screen
through which the pulp flows inwardly, a rotary
screen-cleaning element encircling the screen, 30
said element comprising a plurality of runners
spiralling about the screen, the runners having
apertured bosses by which they are spaced from
each runner, tie rods extending through said
bosses, clamping nuts screw-threaded to the ends
of the tie rods, said screen-cleaning element be
ing divided longitudinally of the screen in a plu
rality of places, a rotary supporting member co
axial with the screen, and bolts carried by said
member and having screw-threaded engagement 40
with the clamping nuts at one end of the screen
10. A pulp screen comprising a casing having
cleaning element, whereby each section of the
a pulp inlet and a screened-pulp outlet, a screen
screen-cleaning element can be removed from the
within the casing having a vertical screening
supporting element independently.
45 wall, baille' plates rigidly secured to the screen
on the delivery side thereof, pulp-pulsating plates
15. A pulp screen comprising acasing having 45
an
inlet and an outlet,
a cylindrical ‘ screen
situated between the baille plates, means to vi
brate the pulp-pulsating plates in a vertical di
through which the pulp'flows inwardly, a rotary
screen-cleaning element encircling the screen,
rection, a vertically-yielding support vfor the ' said element comprising a plurality of parallel
50 screen, and a spring interposed between the
screen and the pulp-pulsating plates and resist
ing downward movement of said plates relative
to the screen.
11. A pulp screen comprising a casing having
55 an inlet and an outlet, a cylindrical screen
through which the pulp flows inwardly, a rotary
screen-cleaning element encircling the screen,
runners spiralling about the screen, each runner
being divided into a plurality of separate sec
tions with the ends of the sections of any runner
lined up with the ends of the corresponding- sec
tions of the other runners along lines extending
substantially parallel to the axis of the screen 55
cleaning element, means for rigidly connecting
together the corresponding runner sections of all
said element comprising a plurality of runners
spiralling about the screen, each runner having a
plurality of spacing bosses which are in line with
and engage corresponding bosses on the adjacent
runners, said connected corresponding runner
sections forming separable sections of the screen- .
runners, tie rods extending through the alined
bosses and clamping the runners together, a ro
means for separately and detachably securing
each section of the screen-cleaning element to
tary supporting member coaxial with the screen
Asaid rotary supporting member.
65 at one end thereof, and means to secure said
runner element to said supporting member.
12. A pulp screen comprising a casing having
an inlet and an outlet, a cylindrical screen be
tween the inlet and outlet and through which
70 the pulp ñows inwardly, a rotary screen-cleaning
element encircling the screen, said element com
prising a plurality of runners spiralling about
the screen, tie 'rods extending parallel to the
axis of the screen-cleaning element and rigidly
75 connecting the runners together, said screen
cleaning element, a rotary supporting member 60
coaxial with the screen at one end thereof, and
16. A pulp screen comprising a casing having 65
a pulp intake and a screened-pulp‘outlet, a cy
lindrical screen within the casing, baille plates
` rigid >with the screen and situated on the delivery `
side thereof, pulp-pulsating plates situated be
tween the baille plates, means to vibrate the pul 70
sating plates toward and from the baille plates,
and yielding means supporting the screen and
permitting limited movement thereof in the. di
rection of vibration of the pulp-pulsating plates
but of less amplitude than that of said plates.
75
v6
l
2,122,475
17. A pulp screen comprising a casing having
an inlet and an outlet, a. cylindrical screen within
said casing through which the pulp flows inward
ly, a rotary;V screen-cleaning element encircling
the?rscreen, said element comprising a plurality of
parallel runners spiralling Vabout the screen, each
runner being divided into a plurality of separate
sections with the ends of the sections of any run
ner lined up with the ends ¿of the corresponding
10, sections of the other runners along lines extend
ing substantially parallel to the axis of the screen
cleaning element, means for rigidly connecting
together the corresponding runner sections of all
the runners, each set of connected-together run
ner sectidns forming a separable section of the
screen-cleaning element, a rotary supporting
member coaxial with the screen atrone endfthere
of, an annular member at the other end ?of the
screen, and means for separately and detachably
securing each separable ¿section of the screen
cleaning elementi to both the rotary supporting
member and saldgannularfmembera
10
NELSON M. KNIGHT.
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