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Патент USA US2406297

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Aug. 20, 1946.
A, JOHNSTON
2,406,297
REGENERATION QF WASTE RUBBER
Original Filed Nov. 12, 1942
' 5 Shéets-Sheet 1
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1111/ 62117601‘
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' Aug- 20,1946-
' A._ JOHNSTON
2,406,297 v
REGENERATION OF WASTE RUBBER ,
Original. Filed Nov. 12, 1942
5 Sheets-Sheet 2
0mg
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,5M).
MW
Aug. ‘20, 1946.‘
-
MOHNSTON
,
REGENERATION 0E WASTE RUBBER
" Original F'iled Now-l2, 1942
' 2,406,297’
'
5 Sheets-Sheet s
Aug. 20, 1946.
A. JOHNSTON
2,406,297
REGENERATION OF WASTE RUBBER
1 Original Filed Nov. 12, 1942
46m
v43
S-Sheets-Sheet 4' _
Aug. 20, 1946.
'
,
_
v
A! JOHNSTON
7
2,406,297
REGENERATIPN o'F WASTE RUBBER
_
Original Filed Npv. 12, 1942
48b
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SSheetS-Sheet 5
‘48
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‘48 “Even 2101-:
Patented Aug. 20, 1946
‘
2,406,297
ES
: { ---'2,406,297 ; -
REGENERATION ,oFtwesri'E Missile. \
Alexander-Johnston; Edinburgh; Scotland,- as- r
H signor to The-North British Rubber Company
fiuLimitedy'Edinbiirgh, scqtialn'ai'ie
I . ioiriginali application , Novemhen;
Serial "7
v. 'No. 465,400., Divided and-this.applicationJan
uary 7,'1944; Serial N0.
‘j ain“Mar_ch 3,1942 ‘
8. Claims. (cilia-f2) ‘ ’
prime mover 22‘,3through a belt drive 23 and .fan
This;inventionfrelates-to' the regeneration or
're'claiming’ofyulcanised waste rubber and/ or Vul
"shaft 24", but any other drive ‘may be used.
eesiseei waste rubber containing fibrous material,‘
‘ “‘ The'i?ue gases'forced into the» tunnel, ‘travel
,so'jthat it may be re-used for manufactu'ringigo'ods
or articles.‘
1
" ‘
‘
'
therethroughp towards its left-hand .e'ndcwhere
'theyfarel‘carried away by the draught of,’ and
through an'elbow ductfv25 ‘back'to; the main line ‘
~Vl5'o'r hthe'rWiséIuhder the control of a damperZB
'inounted‘on shaftZTi'and operated externally by a
‘
V ,In my co-pending application SerialNo. 465,400,
~_fronilwhich the presentappncation is divided out,
I *ha‘v‘
described ‘ a- process' for regenerating ‘ or
lever'1128i- which is adjusted ‘relatively to’ a: ?xed
‘reclaiming was't’e'rubb’er, which involves the-use of
v?ueorfexhaust ‘gas for such'a purpose; and the 1.0 {quadrant 29-‘or many other suitable'wayv Itiis
not necessary to use-the whole of the ?ue gases
‘object or llthe present invention-is van- apparatus
1 since " a; portion-only thereof > may be divertedjior
fibylwhich’the useiand? theTefféct of such gases is
wefl'efotive;ljy-realised.-'T
‘
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the purposes of‘ this invention.
'
a
- -
f '3 --The’ 7plant is" preferably so ‘designed that the
If: A‘ifurtherfobjeotof theinvention is to so carry
- 'hontheioperation thatfthereis' no danger’ of fire :15 ~'regula-tion‘iiof*~the 1tunnel vtemperature ‘may be,
e
F
g-‘tnef treatment."
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p
I , i
controlled "by ‘the V'variationl- of g the. fan draught‘; _,
i
iby‘fthe r'e-circulation‘a ofi'the' l-usedi?ue gases; by
'e'nee wninew 'be made to-thiaacdompany
>ing drawings‘ which illustrate ‘by way vof ‘example
we "terms- of ' apparatus“ by .iw'hi' “the invention
‘be Carried into je?e'clt;
through-{which flue gas is! passed >ini'c'ountercur
Trent to'Fthe-Das'sage of'fythe‘iwastef rubberto be
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r
v
20
"through? the usual ‘lhea't i'economiser or. by .‘other
{suitable means; or? by the admission of heated
gases‘- fro‘inf any - suitable: source. _ :The .tempera- ‘‘
_ igqr'es' v1 ‘and 1“-‘~sho'w1~iin-'twol
lifa'tio‘n“ partly in section‘ of 1a?‘ tunnelappara'tus
"treated"?
‘the 'admi'ssion'l'fofvfcooledi ?ue 'gasesiiafter passing
.
V‘
fture risi- preferably‘ ‘controlled thermostatically by
anywsuitable means.
‘
"
I
»-‘For theseland- other purposes various record
ing‘lirist'ruments are arranged :in a:casingi don
' fjFiigures2and'2a~ constitute alplan‘: view in two
the tunnelas-"sh‘own by Way of example in Figure
{portions/similar‘, to-‘Figu'r'el ~1.‘
1. i'Thus'b-‘indicates a manometer’ gauge which
is in communicationgby a duct 0 with the main
v?ue5~~passing .to‘the chimney. » d is a temper
‘ "
-*
"
::3.:F_*igure:3 is Jariiend'felevation :ofiFigure 1', and
'i-lEig-ur'e‘4showsaperspective 'vie'wio'f a form of
op'eniime'sh container hereinafter referred to.
aturerecorder; e‘Iis-a clock'to timeIthe various
l V Figure I 5: ‘is a idetail= section: taken ‘on the .line
'step's'in'the process and f is a manometer which
6;S—'6,'Figuré 4,'andf‘
"
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a
i
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#aFigure' 6- is a" diagrammatic planvview oi. the
plantirwith" a Lmodi?ed lu'n'lo'ading» and reloading
‘ is in ‘communication by the duct 9 with the out
Iilet:duct--25.~
‘
'
-i'--_'I‘he~composition of .the gas may be controlled
or varied-by the admission of air on the one hand,
‘ system.
1. Referring: to
i. Figures '1 and‘1a;"2o,and.‘2?tand
‘i
3,
or-f'byfnitrogen, carbon dioxide or. other inert ,
the apparatus comprisesa tunnelJ ll‘oibri'ckwork
or\ other ‘refractory material and. the.‘ top "of vthe
tunnel. may beior'me‘d'by ai'seriesi of 1 concrete
in the“ ducting leading to the channel.
inspection opening 12 closed by‘ altrlan‘sparent
‘or other.‘ suitableaplatere'lt ."Toward's; onelend of
sthestunnelandprojecting. outside thereof is a
Ipair'of;rail's>..32 which forms a'eloading platform
the tunnel.,an=.inlet‘=l"4, is provided in the top
and fromzfwhich airamn 33 extends downwardly
gason the other hand,iby means of special inlets
’
The left-hand end of the tunnel is closed pref.
slabs 'l l. which. may be reinforced in the.’ usual 40 erably‘ airtight :‘by a .doors. 30, hinged along.‘ its
upperiedge, and ?tted with a handlew3l. ,Ar
way; and may each be adaptedv for removalt-as
ranged at aconvenient height within the inlet of
will hereinafter a'ppearjéach :bein'g: ?tted. with an
by: which . a ‘portion iofi'the; :ordin'arym?ue vgases
.t'o thecfloor'level.
lpassingiaway toa factoryzchimneyi' through a ‘?ue
indicated atsl 5; is divertedsth'rough anielbowxduct
‘@Adjacentaltoethe bottom of. the tunnel is‘ ar
l6‘, controlled by‘damper‘,",andwdrawnintO a
casing J8 in :which a-i1fan.;;(notshown): delivers
vthe ?ue’ gases through?theinlet, !4 into the tun
'nel-t ,Theimetllist-preferably also provided with
a;.1demper.,.l 9 mounted @011; ashaftq? 1!‘ ..WhiCh: ‘may
‘
rangedanzinciined:moving trackwhich may con
sist:.of;one;or:m0re endless wire ropes or sprocket
rchainsn34 which pass round 'a'pulley or pulleys
35;;35: at; e‘achi‘ end- respectively. The upper
stretch of the wire ropes is atone-end on ailevei
with the rails; 32, and“ the pulleys 35 aremounted
be externally controlled by a cross ghandlej. 2|.
1on~imovablebearings extending through each side
The; vfan .isi ‘driyenlby an: .‘e1eQtriegmoto1: :or; ‘other
loitjthej .itunnel; where"v ‘the ' projecting 1 ends. of lithe
2,406,297
4
pulley shaft 3'! are under'the control of external
of the tunnel, and two of which are seen in Fig
tensioning rods 38 ?tted atone end with springs '
ure 1. A number of ‘inspection windows such
as 55 are provided in the‘side walls of the tun
nel. Due to the moving endless track' each con—
39 by ‘which the wire ‘ropes are tensioned, the
springs 38 pressing at one end against a cross
bar 49, and at the other against'a' head. 4| on
each tensionin'g rod. The endless track is driven
tainer-is rotated on‘ its own axisrand is also
allowed to progress intermittently along the tun
nel down they slope of the track by temporarily‘
? by the pulleys 36 at the other end which are
removing the pins 53. ' >
. which
mounted
is driven
one transverse
by a pulley
shaft
43, 42
which
one in
end
turn
of; _
v
‘As’
already stated the containers >trave1'along
)\the tunnel against the flow of the heating gases
V_
is actuated by
a chain or other suitable drive?“ '10
_
through worm or other gearingyli? from an elec- '
7
tric motor or other prime mover 16.1: 3 r
'
It is to be noted that the pulley orpulleys 36 1' '
at one end of the movinglntrackwaye are smaller ,
in diameter than the pulleys 35' at the; other end, ‘
'
and, as they areicontinuously rotating, the goods
contained therein-are thoroughly exposed to the
action of the gas;v The space beneath the con
tainer-sis ?tted with'a series of bail‘le plates 56 ,
which slope upwards from the bottom of the tun
so that the upper stretch of‘the'track has a down- a
nel so that the gas at the bottom is forced up
ward slope from'th'e >doorway'30 at‘ the mouth’
of the tunnel, and forms a vconstantly moving
ward ,toimpinge'on the containers and thus pre
vent any tendency for the gas to by-pass the ‘con
platform ‘to support and progressively. move.
tainers.
.
.
through the tunnel in-counter direction to the 20' With the same object'in view, a series of hinged
baffle plates 5'! dependfrom the‘top' of the tunnel
"now of the heated gases, a number of containers
41 which are cylindrical in shape and in which
each being in such a position that when the con-i
tainers come to rest ‘against thepins 53 the bai
are placed the goods that are to "be exposed to
the heating treatment.
_
I
‘
?-es 57 are immediately over the centre of each
j
An example of one of the cylindrical containers 25 container. These baf?e platesvary inlength due 7
' 41 is shown in perspective in Figure 4. The con
to the slope of the track.’
The, length of the tunnel is preferably such that c
tainer is constructed of stout wire mesh with
' ends E8 and reinforced by metal framing 49.
the distance between the inlet" door 30 and the "
gas inlet is, is sui?cient to ‘progressively treat
The circular wall of the container is formed by
a number of containers, for example six as shown.
In order to cool'the materials being heated, to
assist in the separation of 'rubber portions from.
‘ or includes twosemiicircular doors 50, each of
which extends halfwayround the'container, ‘and’
Figure 4shows one of the doors in a partlyopen
position.’ Each door is hingedat 50a, on one side
' those-of rubberand fabric, and, to "guard against
possible damage .by ?re, a’ steamlpipe l8a7w‘hich
.and lockedjat the other bysuitable sliding or other
{catches 5|;- Each- half of ;the;icontaineritself 35 extends across the’ ,full widthof the tunnel‘is.
‘ ,.
positioned at the gas inlet l4 so that the steam ~ '
tisf'divided intotwo- compartmentskby'open wire
"Vmes?spartitionsjii;I The circular, ends 58 have
impinges on the material when it is atits highest
i ‘reinforced iringsrf??agformed ~ with 17a?v groove 48b
temperature; rI‘heftunnel-then continues for a‘
further distancetoyprovidea cooling zone-(which _
in-the'detail view in Figure‘ 5. Such a cage-like 40 maycontain three containers at a time,;for ex
-’ with ' which’ . engagesgtheiwire from 34,. as shown
ample, and: itijis ?tted/with a steam pipe [8b '
‘- container ensures that the go'ods'or material held Y
'therein'will-be thoroughly exposed to'the; action ~ I‘which" is similar to the steam pipe Ilia and which
assists in- theucooling. of the heated rubber. prod
of the heated gas or gases.
‘j
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v.
uct, asiwellasj preventing danger of ?re.'_ The
' A number of such cage-like containers 4'! are
rolled ‘upthe ramp 33 on to the loading platform
. bottom of. thiszone is formed with a ?xed slope ‘
32 and admitted in 'turn into the open, end of " vindicz-tted at 51a. Finally'thetunnel terminates
in‘ a gas lock or discharge compartment \578, the
the tunnel'through the door 30 at suitable-inter
entry into and the exit from which'are' controlled
by any suitable type of sliding self-sealingv door
,‘Therlcadi‘ng and the unloading .of the contain
59, either manually or mechanically operated.
V'ers may ‘alternatively be e?ectedrby'a ‘conveyor
Such gas lock or: discharge compartment .will 7
system such as isdiag’ranunatically illustrated by
way ‘of‘example in Figure 6. This comprises an
completely isolate the container .witl'iin' itto allow
a further period for cooling. "rWhen-"thezmaterial
' overhead runway which commences atithe outlet’
.end of'the tunnel l0 and makes ahalf turn cir
is'sufticie'ntly cooled the end'door 65' is opened '
cuit eilonl to av returnv path El and extends
to allow the container to beremoved, the inlet
through another half-turn at Ela/tofthe inlet’
door 59 being at the same time closed. By such
an arrangement not only will any unnecessary
end. The runway‘ is provided‘ with ‘any usual
vals.
_
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4
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V
.
form of suspension block and tackle and a quick
” acting grip,'not shown. ‘
escape of heat from the tunnel be prevented, but
any inrush of atmospheric air orrisk of ?re will
.7 As a' container 41 shown in dotted lines leaves 60
the tunnel it is carried round the loop 60 onto
the return path 6! to a suitable’ deck 62 at which
Furthento prevent any danger of ?re, the com
partment as shown is ?tted with a water spray '
it and all the‘ containers ‘in turn are unloaded.
Fromthis deck the empty containers arepicked
or steam jet 61,
Finally, the general temperature of themain
"up in turn and moved forward to 'a second deck '
, ' 63 where they are re-loaded with stock ready to
‘ . be reclaimed. n'I'hey are then carried on round
tunnel, as well as that of the cooling zone, may
be controlled by any usual formof'thermostatic
device or devices, which as being well‘known in
the loop Ma and‘ lowered onto the loading plat-'i
form-32 at the tunnel inlet, to await'processing.
fAft'er entering the tunnel, the cQntainers are
supported‘on the jupperl stretch of the moving
' 7' track '34, thefvarious containers being kept sepa
' ‘rated from one another by cross‘pins v53jwhi'ch
: make contact with the end rims of the'cont'ainers
be prevented by'the isolation of the compartment.
.
many forms it is not herein illustrated.
’
770
'
'
It‘ should be emphasized that the’ material be
ing heated in the tunnel device'is under constant
inspection and control all the time it- is passing
through *the tunnel and . that’ the duration or
vtreatment may bevariedlby'suitable manipulation ' ' V
1 of the pins 53,.
4:7‘ iilserted‘through; holes 54 in the opposite sides 75 1 The tunnel as 'describedis' made vrof refractory l 1
.
2,406,297
5
brick and concrete slabs with or without metal
lic sheathing and is preferably insulated suf?—
ciently so that the heat loss of the gases is as
the moving trackway to divert the heated gases
upwardly and a number of uniformly spaced
transverse ba?le plates swingably suspended from
the roof of the tunnel for making successive con
where the gases leaving the tunnel are returned Lu tact with the upper parts of the passing rotating
containers to substantially divide the tunnel into
to the main ?ue before entering an economiser.
compartments and insure of the passage of the '‘
The tunnel may however be constructed of sheet
gases directly through the rotating containers.
metal or any other suitable metal which would
low as possible.
This is particularly desirable
similarly be efficiently insulated.
It is to be understood that the treatment ac
cording to the present invention does not involve
any material consumption of power, and that the
gases preferably used are readily obtainable in
asmuch as they are waste gases and that no high
pressures are necessary.
I claim:
>
5. Apparatus for reclaiming and regenerating
waste rubber comprising in combination a tun- ,
nel-like casing having an entrance at one end
and a discharge compartment at the other, and
having a cooling zone near the discharging com
partment and a heating zone near the entrance
15 and through which flows a stream of heated inert
?ue exhaust gases towards the entrance, 2. retic
ulated trackway near the floor of the casing in
the heating zone and inclined downwardly from
waste rubber comprising in combination a tun~
the entrance end andm?o-vable longitudinally of
nel-like casing divided into heated and cooled
zones, a discharging compartment at the outer 20 the casing, means for moving the trackway, a cor
respondingly inclined floor in the cooling zone, a
end of the cooled zone, an entrance at the end of
series of removable perforated cylindrical con
the tunnel remote from the cooled zone, means
tainers supported transversely on and in rolling
for passing a stream of heated inert exhaust
contact with movable trackway and inclined ?oor
gases through the heated zone from the inner end
for receiving the waste rubber in ?nely divided
thereof and toward the entrance end. of the turn
pieces, said inclined floor acting to rotate the
nel, an inclined trackway in the bottom of the
containers as they pass down the floor, and means
tunnel throughout the length thereof, at least
for temporarily retaining the containers in set
that portion of the trackway in the heated zone
positions within the desired portions of the cas
being lovable in a direction longitudinally of the
tunnel-like casing, means for moving said track- (I ing for a predetermined period of time, and the
movable trackway in the heated zone acting to
way, a series of cylindrical perforated containers
insure rotation of the containers about their own
for waste rubber supported on and in rolling con
axes due to the rolling contact of the container
tact with the trackway and movable through the
therewith,
tunnel-like casing from the entrance end through
6. Apparatus for reclaiming and regenerating
the heated and cooled zones and successively into
waste rubber as claimed in claim 5 wherein a
the discharging compartment, means for isolating
1. Apparatus for reclaiming and regenerating
the discharging compartment when a container
series of uniformly spaced transverse baffle plates
is to be discharged and means for temporarily
arresting movement of the containers through
depend from the top of the casing to divide the
heated zone into a plurality of compartments,
the tunnel whereby rotary movement is impart 40 said baffle plates terminating at the uppermost
ed to the containers by engagement with the
movable trackway.
2. Apparatus for reclaiming and regenerating
surface of the containers so that the ?ue gases
are compelled to pass through the containers
waste rubber comprising in combination a tun
and a series of upwardly inclined baffles co-op-J
crating with the partitions and rising from the
nel-like casing provided with an entrance and
?oor of the casing to the under surface of the -
with a discharging compartment, a damper con
trolled inlet for admitting a stream of heated
inert ?ue exhaust gases at a point medially of the
ends of the casing, a controlled outlet for such
gases near the entrance‘ end of the tunnel, a
movable trackway to insure the passage of the
gases from one compartment to the other only
through the containers.
trackway on the floor of the tunnel sloping toward
the gas inlet and movable in a direction longi
tudinally of the tunnel-like casing, means for
7. Apparatus for reclaiming and regenerating
waste rubber comprising a combination with a
tunnel as claimed in claim 2 of an external run
way extending irom the discharging end of the
tunnel then curved and extended in parallel re
lation to the tunnel and ?nally curved and ex
moving the trackway, a series of perforated cylin
drical containers for waste rubber supported on 55 tended back to the entrance end ‘of the tunnel
in such a manner that the'runway and tunnel
and in rolling contact with the trackway and
form a substantial loop, a loading and unloading
moved by the latter through the tunnel in a di
dock at about the center of the runway opposite
rection opposite to the flow of gases, means for
the tunnel so that each container with the ?n
intermittently stopping the containers in their
travel through the tunnel whereby rotary move 60 ished goods may be moved from the tunnel
around the runway and. unloaded and then re
ment is imparted to the containers by their en
?lled with stock to be treated and then moved
gagement with the driven trackway.
around to the tunnel inlet.
3. Apparatus as claimed in claim 2 in which the
8. Apparatus as claimed in claim 2 in which
means for intermittently stopping the containers
in their travel through the tunnel include a plu 65 each of the cylindrical containers comprises end
plates and sides of‘ open mesh work having in
ternal partitions of open mesh work forming a
number of compartments therein and portions
of the sides being in the form of hinged doors
on their own axes.
'
4. Apparatus for reclaiming and regenerating 70 by which waste rubber may be passed into or
withdrawn from the compartments.
‘
waste rubber as claimedin claim '2 wherein a
number of upwardly sloping ba?le plates are
ALEXANDER‘ JOHNSTON.
.spaced along the floor of the tunnel and beneath
rality of rods adapted to be extended across the
tunnel to stop the passage of the containers
through the tunnel but allowing them to rotate
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