IMPROVEMENTS IN SELF CLEANING PULP STRAINING MACHINES
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, WILLIAM LLOYD WISE, of N° 46 Lincolns Inn Fields, in the County of
Middlesex, Consulting Engineer and Patent Agent, do hereby declare the nature
of said invention for "IMPROVEMENTS IN SELF CLEANING PULP STRAINING
MACHINES" (a communication to me from abroad by Mess™ Escher, Wyss and
Company of Zurich, Switzerland, Engineers) to be as follows:-
In a self cleaning pulp straining machine according to this invention the
material under treatment is delivered on to inclined strainer plates, either straight
or curved, and is kept in constant agitation thereon by impulses or pulsations
caused by the motion of a piston, plunger, diaphragm or equivalent appliance.
The impurities, such as coarse particles, sand, dirt and the like, gradually travel
down the incline, and fall through apertures into a sorting trough or channel,
provided with valves, vanes, fans or worms by which communication with the
space above the strainer plates can be cut off, and from this trough or channel the
impurities are removed, either continuously or from time to time.
By this arrangement the impurities in the material which is being cleaned are
constantly and automatically removed, and the surface of the strainer plates
remains free, thereby ensuring regularity in the passage of the material, and
cleanliness in the finished product. The width of the slots can be readily altered
as the plates are loosely mounted, and the latter can be rapidly removed for
cleaning when required. While the apparatus is in operation a change of material
can be made with very little loss, and this renders the apparatus highly suitable
for sorting cellulose, saw dust straw and the like.
Referring to the accompanying drawings which are appended by way of
illustration,
Figs 1 and 2 show a longitudinal and cross section respectively of a duplex pulp
strainer according to this invention as ordinarily constructed.
Fig 3 is a cross section of a single strainer.
Figs 4 and 5 shew modifications in the arrangement of parts of the duplex
apparatus. Fig 6 shews modifications of the apparatus.
TD 071

page_text: The slotted plates P are loosely fastened in the case or box K by means of wedge-
like or tapered cross pieces T as shewn in Figs 1, 2, 4, 5 and 6, or by means of
wedges a as shewn in Fig 3.
Below the plates P are arranged the sorting troughs or channels A in which all
the portions of material which do not pass through the slots fall by reason of their
weight.
Slowly rotating valves, vanes or fans are arranged as shewn in Figs 1, 2 and 3
in the sorting troughs or channels A, A or in place of these there is sometimes
employed a helix S or a cock or one or more rakes or scrapers or the like. All
these appliances have for their object to periodically separate the sorting troughs 1
from the case or box K, so that the impurities in the trough may be removed
without much loss of material.
-
In order to be able to remove the said impurities more easily water is periodically
injected into the lower part of the sorting trough.
The passage of the strained material through the narrow slots of the plates is 1
facilitated by constant agitation.
This may be caused in any known manner, as by the rapid to and fro motion of
an elastic water tight bottom B as shewn in Figs 1, 2, 3 and 4 or of a flat
diaphragm D as shewn in Fig 5 and on the right hand side of Fig 6, or again of a
piston as shewn on the left hand side of Fig 6.
The motion of the agitator may be produced by any convenient means such as
that shewn in Figs 1, 2, 3 and 6 that is by means of an eccentric E or by a crank
or gear wheels, or any other suitable mechanism.
The material requiring to be cleaned is conveyed through pipes or channels into
the box or case K above the slotted plates P and in consequence of the agitation
sinks when purified through the slots of the plate P and runs out through side
openings into the paper machine.
The coarse portions of the material and the coarse impurities which cannot pass
through the narrow slots of the plate P gradually fall by reason of their weight
into the troughs A which are open at the top. After the rotary valve vane or fan
has accomplished a few revolutions these coarse portions are discharged through
openings arranged below the troughs.

page_text: COMPLETE SPECIFICATION.
I, WILLIAM LLOYD WISE, of N° 46 Lincoln's Inn Fields in the County of
Middlesex, Consulting Engineer and Patent Agent, do hereby declare the nature
of said invention for "IMPROVEMENTS IN SELF CLEANING PULP STRAINING
MACHINES" (a communication to me from abroad by Messrs Escher Wyss and
Company of Zurich, Switzerland, Engineers) and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:-
In a self cleaning pulp straining machine according to this invention the material
under treatment is delivered on to a strainer plate or plates that may be inclined
or vertical and either straight or curved, and is kept in constant agitation thereon
by impulses or pulsations caused by the motion of a piston, plunger, diaphragm or
equivalent appliance. The impurities, such as coarse particles, sand, dirt and the
like, gradually travel down the incline or to the lowest position, and fall through
apertures into a sorting trough or channel, which can be provided with valves,
vanes, fans or worms by which communication with the space above or on one side
of the strainer plates can be cut off, and from this trough or channel principally by
the aid of injected water the impurities are removed, either continuously or from
time to time.
By this arrangement the impurities in the material which is being cleaned are
constantly and automatically removed, and the surface of the strainer plates remain
free, thereby ensuring regularity in the passage of this material, and cleanliness in
the finished product. The width of the slots can be readily altered as the plates
are loosely mounted, and the latter can be rapidly removed for cleaning when
required-While the apparatus is in operation a change of material can be made
with very little loss, and thus renders the apparatus highly suitable for straining
and sorting pulp or cellulose, saw dust, straw and the like.
Referring to the accompanying drawings Figure I represents two half-longitudinal
sections on lines 1-2 and 3-4 of Fig II which is a vertical cross section of a machine
according to this invention with the screen plates inclined toward each other.
Fig III is a cross section through a machine with only one screen-plate. Fig IV is
a part cross-section of a machine with two screen-plates inclined both toward the
outside; Fig V a part cross-section of a machine with two screen plates inclined
toward each other, Fig VI a cross section through a machine with two curved
screen-plates and with two different means for shaking the pulp. Fig VII is a
cross section of a machine with a vertical screen-plate; Fig VIII a half longitudinal
elevation and a half longitudinal section on line 5-6 of Fig VII. Fig IX. is a
cross section of a machine with two vertical screen-plates and with one channel or
trough for leading off the impurities. Figs X, XI, XII, XIII, XIV and XV are
part sections showing modifications of the channel or trough leading off the
impurities.
Similar letters of reference in different figures indicate similar parts.
In Figs I and II. K. K¹ represents a box of wood or cast iron containing the
two sifting screen plates P. which are provided with slots or holes suiting the

page_text: fineness of pulp which is desired. The screens P incline toward the centre of
the box and are placed with their lower edges on top of the channel or trough A
which is shown in the drawing as cast in one with the box K. K' and in com-
munication with the part K. This trough or channel serves to lead off the
impurities of the pulp. The upper edges of the said screens rest within grooves p³,
cast to the walls of the box K. In order to secure the screens rigidly within said
box, an iron partition-plate T with a wedge-shaped lower edge presses on the
lower ends of the screens, and locks the upper ends of the same within the said
grooves p². In order to facilitate the removal of the impurities the partition-
plate T is provided with a number of openings t at its lower edge, whereby the
two portions K of the box are in communication.
The channel or gutter A is provided with a slot a¹ beneath the lower ends of
screens P, and with an outlet a³ at one end for the impurities or coarser pulp
retained by the screens.
A fan-valve H, with a suitable number of blades, is mounted within the channel A.
It is driven by means of a shaft D and the pulleys d³, h²; d¹ is the first motion
pulley. The axis of the fan H is provided at its journals with a suitable stuffing
box h¹ in order to prevent any water from leaking through the said journals.
Underneath the screens P a bottom or floor plate B is secured, water-tight to the
walls of box K¹ and to a flange of the channel A. This elastic connection is made
by means of the rubber or leather bands b¹ and a water-tight receptacle is thus
formed underneath the screens P for the sifted pulp. This pulp will flow out
through the outlet O, and may be carried away by means of a trough Z. To keep
the pulp in motion the elastically attached bottom plate B is provided with a
vibrating device. A rocker shaft 6º, with the angular levers 63 keyed thereon, is
mounted in bearings underneath the box K. K' and plate B, and the said angular
levers are each pivotted with one arm to the eye-pieces 6º which are fast to the
bottom plate B. and with the other arm the said levers are connected to an eccentric
disc E by means of links b', -the said eccentric discs E being mounted on the
shaft D.
The pulp to be strained is conducted to the machine by means of the channel R
and by means of suitable overflows y¹ flows into the first part K of the box K. K¹
(see Figure 1, just described) on to the screens P. According to the size of holes
or slots of the same a portion of the pulp will go through the screens and will flow
through the outlet O into the trough Z. The impurities and the coarse pulp will
flow down over the inclined surfaces of the screens P into the channel A through
the slot A¹ from whence they will be carried away through the outlet a* by a
current of water. The fan-valve E. serves for separating and for successively
dividing the impurities from the good material.
If it becomes necessary to change the screens P, the partition plate T is taken
off and the screens can be easily removed.
As shown in Fig III, the machine may also be constructed with only one inclined
flat screen plate P, and then it is preferred to fasten the said plate by means of the
wedges a. The channel A is located in this case on the one side of the box and is
provided also with a slot a¹ and an outlet (which however is not to be seen in
Fig III.); the channel A can also be provided with the fan H, as it is seen in
Fig III.
In most cases it will be sufficient to inject water for carrying off the impurities
into the channel A through an inlet W at the bottom. The fan H is shown in
Fig III driven from the driving shaft D by means of gear wheels. The vibratory
motion of the plate B is obtained in Fig III by an arrangement of levers differing
from that before described. These parts are not essential.
Fig XV shows a modification of the arrangement of the outlet O and the
overflow into flue Z, said outlet being led, like a syphon, around and underneath
the pipe A.
In Fig IV the flat screen-plates P are shown inclined from the centre toward
both sides, and two channels A. for the impurities are shown cast in one with the

page_text: box K. K' and provided with the slots a¹. The channel R. is shown above the
partition wall T, which in this case secures the upper ends of the screens P, while
the lower edges of the same can be inserted in grooves p of the side walls of the
box K. The outlets y¹ of the channel R. are shown in the bottom on both sides of
the partition-wall T.
In Figs V and VI different means from those shown in Figs I, II, III and IV for
agitating the strained pulp are shown.
The bottom of the box K. K' is cast in one with the side walls, and instead of
having a vertically-oscillating bottom plate B, circular discs or square plates C, as
shown in Fig V and the right band side of Fig VI, move up and down underneath
the screens P within the receptacle for the strained pulp. By this arrangement an
intermittent suction will be brought to bear on the unstrained pulp, so as to
facilitate and accelerate the straining process, and at the same time the strained
pulp will be strongly agitated, so as to be kept in an uniform state of fluidity.
The same result is obtained by the device shown on the left hand side in Fig VI.
A cylinder J. like that of a pump, is secured underneath. and to the bottom of
the box K. K¹ and a piston I is fitted therein and moved up and down, so as to
produce alternately a suction and a plenum within the receptacle. The piston I as
well as the disc C receive their movement from the shaft D provided with.
eccentrics E links etc as shown in Figs 1 and 2. In Fig VI the machine is shown
with two curved screen plates P. The convoyer H. is the equivalent of the four-
bladed fan shown in Figs 1 and 2 etc: and these apparatus, besides preventing
any settling of the pulp in the said channel A, have for object from time to time
to shut off the channel A from the pulp in the box part K.
Devices for the samo purpose, which may be considered as equivalents, are shown'
in Figs X, XI, XII, XIII, XIV.
In Fig X there is substituted for the conveyer H a shaft H with cam-discs,
which alternately shut and open the slot a' by means of a flat bar V, or by means
of a series of valves, guided vertically. In Fig XIII the slot a¹ is alternately shut
and opened by means of an oscillating segmental bar 80 which is formed in one
with the shaft So. In Fig XIV the channel A. is shown separated from the space K.
above the screen P by a slide S and the outlet a² of the channel A is shut or
opened by a slide S¹. Both these slides S S¹ are alternately shut and opened by
the eccentrics on the shafts 8. 8¹ respectively, and the said shafts may be driven
from a driving shaft in the same way by belts or gears as shown before for the
shaft of the fan H.
In order to prevent the settling of the pulp in the channel A, there is an inlet W
which serves for injecting water for rinsing purposes.
In some cases the mechanism used for the removal of impurities may be dispensed
with, the latter being carried away from the channel À by rinsing water. In
order however that too much paper pulp should not be lost it is advisable, when
the rinsing water is running in the channel A to close the slot a³ with a flat bar V'
as shown in Fig XII, or with a longitudinal valve V as shewn in Fig XI; or
lastly with a segmental bar S° Fig XIII.
The inclination of the oblique strainer plates P in the above described arrange-
ment may be increased until the said plates come to assume a vertical position. In
this last case the channels A still retain, as will be readily understood, their
position in the compartments K, the characteristic feature of this invention not
being altered. The other parts however are modified to suit the altered conditions
when the said plates have the maximum inclination. The height of the box increases
likewise relatively to the diminution of its width so that instead of the compart-
ments K and K' lying one above the other, they now stand side by side. The
oscillating bottom plate B and the like may be advantageously placed in a vertical
position the motor mechanism being thus greatly simplified.
Figs VII to IX. shew the vertical strainer plates arranged as above stated,
Fig VII being a cross section, and Fig VIII half a longitudinal elevation and half a
longitudinal section illustrating the arrangement of one of the vertical strainers P.

page_text: The slotted strainer plates P are loosely fixed by means of a cross bar T¹ in the
compartments K. K¹. Below the compartment K is arranged a channel A in which
the coarse and heavy portion of the material under treatment (which do not pass
through the strainer plates P) sink, by reason of their weight, through the slots a'.
The oscillating plate B is arranged upon the vertical rear wall of the compart-
ment K¹. This elastic and waterproof oscillating plate B may be replaced by any
other corresponding oscillating device such as those above described for the less
inclined arrangement.
As shown in Fig VII and more particularly in Fig VIII the plate B is firmly
connected with the brackets 6ª which secure the rods bª to which are fixed the
eccentric rods 64, the latter transmitting a motion from the eccentrics keyed upon
the first motion shaft D to the oscillating floor B.
The material which has to be strained is conveyed through channels to the com-
partment K; and by reason of a rapid agitation the pure portions of the material
are caused to pass through the slots of the vertical strainer plates and arrive in
the compartment or oscillating chamber K¹ from which they are removed through
the channel L.
Fig IX is a cross section of a modification of the duplex arrangement of vertical
strainer plates. The channel A is common to the two compartments K of the box
which in order to obtain a more effective agitation are separated by a partition n.
The shaft D imparts an oscillating motion to the contents of both compartments
at the same time..
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what
I claim is, in a self cleaning pulp straining machine
'
1. The combination with a strainer plate, of a sorting channel or gutter
substantially as described and for the purpose specified.
2. The combination of two strainer plates in a common box or receptacle and
inclined either outwardly or inwardly or standing vertically, and a common sorting
channel or gutter or with two separate sorting channels or gutters substantially as
described and for the purpose specified.
3. Locking or fixing the strainer plates inclined either outwardly or inwardly by
means of a wedge shaped or oblique cross bar T substantially as described with
reference to Figs II, IV, V and VI.
4. The combination, with a strainer plate and a channel for leading off the
impurities of a device for intermittently cutting off communication between the
said channel and the strainer plate substantially as shewn and described.
5. The combination of the box K. K¹ with outlet O, the inclined or vertical flat
strainer plate (or curved strainer plate Fig VI.) P, located therein, with or without
the partition plate T, the feed channel R with overflow y', the sorting channel or
gutter A for the impurities with slot a¹ and outlet a³ and the shaking mechanism
constructed arranged and operating substantially as set forth and shewn on the
drawings.