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NOV. 19, 1946.
A, ¿_ WHITCOMB
BLAST FURNACE CONSTRUCTION
Filed April 5, 1945
`
2,411,487
.
4 Sheets-Sheet l
Nov. 19, 1946..
"
A_ _|_ wHlTçOMB
2,411,487
BLAST FURNACE CONSTRUCTION
Filed April 5, 1945
\1._' ~
51N
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4 sheets-sheet 2
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, £25113»
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Nov. 19,- 1946.
.
A_ J_ WHWCOMB
'
BLAST FURNACE CONSTRUCTION
2,411,487
-
Filed April 5, 1945
4 Sheets-Sheet 3
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INVENTOR.
Af’z'h wmf Whi?comb
BY
‘
Nov. 19, 1946.
2,411,487
A. J. WHITCOMB
BLAST FURÑACE CONSTRUCTION
Filed April 5, 1,945
1_1 Sheets-Sheet 4
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Fig. 4
INVENTGR.-
.Af-¿har J. Whi tcamb
»
BY
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.
„
Patented Ncv; 19, 194s
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«2,411,481
Arthur `J.' Whitcomb. Chicago,
ÁFreyn E
Company Chicago
„ corporation crnnmc
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‘ Application Api-u s, 1945, scc-u1 Nc'. `ssa'nc` `
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4 claims; ~„ (ci. zcßfzfn A, ,
‘ ‘l The present"invention‘ïrelates.to improvements
ingblastfurnace‘construction:
‘
`
‘
construction having 1intcrlci¿innig„meaus.Á such,... as,
above 'referred to which i'sfsimple Íändìnot likely
`
»mast furnaces Iare*commonly 'provided' at `the
togctoutotordea4
top thereofV with ‘two ‘ bellsï‘arranged ‘in series,` `an
uppérmostïbell termeda small bell> an‘d‘ a lower
material into the lfurmfvì.<_:eïwhile preventing the
escape of "large ’quantities of‘gas from the'interior
commercial service.
of thelfurnace‘.- 'I'l'iefFci'm‘RiceY and `Whitcolnb 10
Patent No. 2,215,872, patented `September 24,1940,
disclosesa blast; furnace Aconstructionv having lan
large bell.':together'withy certain permissive inter
i
f
i
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Further objectswill appear'asfthe description proceeds.
`
embodiment of the presentl invention;
locking mechanism "therebetween: f 'ThisV ‘equip is
mentï "is applicable under ordinarycon‘ditionsf-in
which> the «pressure within the top ofthe blast
`
`
‘
c -
`
Figure 2 is a. detail view§`partly in section, show
ing a relief valve which may be usedin the prac- i
tice of the present invention; 'f
Figure 3_ is a detail view. partlyl in*` section,
showing an equalizer valve which `may >be `used
furnace
Therevis
appear
not' ioohigh."
`to be ‘certain
"
advantages
u l f i i
in op
erating blast furnaces at~`increased internal pres 20
sures such that the pressure at the vtop of the blast
inthe practice ofthe present invention ;:
" u
Figure 4 is a panel diagram showing relay' and
other instrumentalities‘iwhich _may be `used in '
furnaces “might approximate one atmosphere
carrying out the objects of the present invention;
above mean atmospheric pressure.` The ‘use of '
and
a‘nvequalizer'valve would `be necessary in connec
valve being ‘utilized to equalize the pressure bef `
' i
u Figure
Referring
1 ist0`
a the
diagrammatic
drawings-view
' ` illustrating-one
`
equalizer> `'valve ‘ between Vthe f small" >bell `‘and the
essary‘to introduce a‘relief valve, the equalizer
K"
the large and small bells, an equalizer valve, and y
a` relief valve well adapted to meet the-needs of
opened alternatively“ 'to "permit" the insertion " `of
be sufilcient. In‘ addition thereto it becomes `nec
'
construction having interlocking means; between
most bellßtermed'ïa ¿large"bell.` ‘ Saidïbells are
tion with‘su'chfa'blast furnace, but Íit‘would not
‘
A further `object is to provide a blast furnace
25
^
‘
_
»
Figure 5 is a diagram which may be> used in
locating the instrumentalities in certain ‘of the
relay circuits shown inllî'igure 4, the contactors
l and coils in said relay circuits being located in
line with the corresponding instrumentalities in
-tweenïthe‘top of’the furnace chamber‘and the
region between the bells prior'to opening theflarge 30 Referring ilrst to Figure 1, the letter A repre
bell, therelief valve being used’toreduce the pres
sents a small bell (located uppermostland the
sure in the region between the -bells ‘to atmos
letter B indicates a large bell (located lower
Dheric‘pressu're -prior to opening the small bell. "
most), which cooperate with vone another in the
` An‘object ‘of the presentinvention is to -provide
charging‘of the blast furnace C, which provides a
Figure
4.
'
,
’ i
`
a blast furnace construction having an equalizer 35 furnace chamber below "the large bell B. ~ The two
bells A and B may beuarranged coaxially in a
together with novel‘interlockin'g means therebe
manner which is common in practice, the bell A
tween and with the furnacebells.
' ‘
ì
being controlled by a cable E, while the lamer
l A further object _is to provide an improved blast
bell B` is controlled by the cable D, levers F and
valve and a relief valve such as above Vreferred to,
furnace construction having interlocking means 40 G being> connected to ‘said cables D and‘E, re
as above referred to in which themechanisms un-v
`spectively, said levers F and G being connected
tothe bells B and A, respectivelv. The cable E
necessary movements before the next succeeding
is connected to the hydraulic cylinder H, which
movements may be made. f
4 `
l
Y.
is adapted to have a reciprocating movement
A further object is to providea blast furnace 45 along a vertical'axis.A
`
‘
' '
«
construction`having interlockingY means of per
Disposed within the small bell cylinder H is the
missive typefin `that it gives permission >forcertain
piston I, which piston is carried by the piston rod
functions'to takefplace`,~~l:)ut` also requires them to
J. Said piston rod J and piston I are stationarily
take place as prerequisites to bell opening opera
mounted. The piston rod J Vis provided with the
50 port K‘communicating with the space above the
A further object is to 4provide a. blast ‘furnace
piston I and is also provided with the port L com
der control must‘actually respond and make their
tionsi*
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f
i
"
construction‘having improvedinterlocking means
which prevents the functioning of the parts under
improper
conditions.
v
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"
municating with the space `below said piston I. .
’I'he letter- M indicates‘a'four-way valve,l which
need not be described in detail, inasmuch as‘such
A further‘j‘object is to‘pro‘vide a> blast furnace 55 valves are well known and are‘readily purchas
>
2,411,487
.
4
i
ate member I3 in a clockwise direction-to ymove
_able in the open market. It will be suilicient to
state that when said four-way valve M is in one
the valve I3 from its seat to .open the equalizer
valve Il.
‘
' predetermined position, it provides communica
As shown in Figure 1, the cable I3 is train
. tion from the fluid inlet N through port L to the
space below the piston I. At the same time said Ul over a sheave I3 and has its lower extremity
connected to the piston -rod 23, which is con
valve M provides access from the port K to an
nected to the piston 2I in the cylinder 22. The
_cylinder 22 is provided at its top. with the in
exhaust O._ When said four-way valve M is in
another predetermined position it permits access
let conduit 23 and at its bottom with the exhaust
space above the piston I. At the same time it per 10. conduit 24. >Said inlet conduit 23v is connected
to the three-way- valve 23, which may be of
~ mits access from the space below the piston I to
'usual conformation.. Said three-way valve 23 is
the exhaust O. Said four-way valve M is adapted
from the ñuid inlet N through the port K to the „
to be operated by means of the motor P, which, ' »
through any preferred power transmitting mech
anism,- operates the crank Q. Said crank Q may
'be connected to said four-way valve M through
any preferred mechanism. Said crank Q may
also operate certain limit switches, which will be
provided with' the air inlet conduit 23 and with
the. exhaust conduit 21. Said valve 23 is re
sponsive to the -plunger 23, which is adapted to ’
be ’controlled by instrumentalities to be explained
more in detail presently. It may be stated briefly
at this point that the valve 23 is biased to a posi
tion wherein air above the piston 2|v will be"-ex-
described presently.`
'I'he cable D is connected to the cylinder R, 20
which is also `adapted _to have a reciprocating movement along a vertical axis. Said cylinder '
R is provided with the piston S carried by the __
’ hausted through the conduit 21 to the atmosphere
and said plunger will be'raised to its uppermostv
position. Air under pressure from the tsupply f
conduit 23 may be. communicated through the
piston rod T. Said piston S and piston rod T- conduit -23 to the region above the piston 2| to
are stationarily mounted. Said‘piston rod T'is 2.5 force said _piston downwardly to exerta‘ down
ward pull on the cablev I8 to liftthe counter
provided with the port U,_providing access .to the
weight I1> to move the valve member I3 'from its'
space _above said piston S’k Said piston rod T ‘is
seat to open the equalizer valve II. The piston
also provided with the port V. providing access
rod 20 of the cylinder 22 is provided with a cam
to the space below said piston S. The letter W.
29 adapted to operate a pair of ,limit switchesf'to
indicates a ’four-way valve similar in function to
ythe four-way valve M above described.
_be described presently.
When
-
- Communicating with the space between the
vsaid four-way valve is in one predetermined posi
_ small bell A' and lthe large bell B is a relief con- -V '
tion, vit permits access from the source of iluid
duit 3_0 provided with the relief valve 3l.' the
pressure N to the space on the under side of the
piston S, and at the same time provides access 35 details of which are illustrated in Figure 2. Said
relief valve’controls access from the region be
from the space above the piston S to the exhaust
tween the bells A and B to the atmosphere. ' '
' ‘0. When'said -four-way valve W is in another
_ predetermined positiomîitpermits access from
r
\ Referring to Figure 2, it will be notedv that _
the relief valve 3| includes the _movable mem
ber 32 adapted to be seated against the stationary _
valve- member 33. Said movable valve member
the source of iiuid pressure N to the space above
lthe pistoni S, and at» the same time permits ac
cess from the space below the piston S to the
exhaust O. Said four-way valve is adapted to
be operated by means of the electric motor> Y,
A 32 is pivotedto a swinging arm‘34 fast with an
arcuate' member35. Saidarcuate member 33
has a pair of grooves in .its arcuate periphery,
which, through any preferredpower transmit-.
ting mechanism, is adapted to turn the crank
_one for receiving a cable 33 which-suspends the
counterweight 31. The other end of the cable
33 is secured, through means not illustrated, to
the arcuate memberl 33. The other >groove in
.Z. Said crank Z is connected to the four-wayl
valve W through any preferred connecting means, _
which need not be described'.
the arcuate periphery ofthe arcuate member 33
The numeral I0 indicatesa-by-pass conduit,
one end of which is connected to the interior of.
the furnace chamber adjacent to the top there- ‘
of and the Aother end of which is connected to
. the space between the large bell B and thesmall
bell A. Disposed intermediate of the length of
the conduit Ill’is the equalizer valve I I, shown
' more in detail in Figure 3. By referringto Fig
u_re 3 it will be noted that said equalizer valve
II includes the stationary seat _l2 adapted to
be contacted by the movable valve member~ I3.
. Said movable valve member I3 is pivotally mount
- ed at the end of a swinging arm I4, which arm
is fast to the swinging arcuate member I5 jour
naled within~ a portion of the -valve Il. Said
arcuate member I5 has two grooves in its pe
riphery, one for receiving the cable I3, from an
extremity of .which is suspended the counter
weight I1. The other end o! said cable I3.is fast
receives the cable‘33, one end of which-is secured
to the arcuate member 3l. By reference to
Figure' 1 it will be noted that the cable 33 is
trained over the sheaves 39 and 43 and has its ‘
other extremity connected to the piston rod 4I
fast‘with the pistony 42 in the operating cylin
der
3.
f
.
`
Communicating with the space above the pis
ton 42 in the operating cylinder 43 is the con
duit .44 provided with the three-way valve 43.
60 Communicating with the valve 43 is the con
duit 43 for supplying air under pressure. and`
also communicating with the valve 43 is the con
duit 41 for discharging air to _the atmosphere.
The lower regi'on ofthe operating cylinder 43 is
provided with the exhaust conduit 43 for pass
ing air frombelow the piston 42 to the atmos
phere. Said valve 43 is responsive to a plunger:v
43, which in its lowermost or-biased position
with‘the arcuate member I3. The_counterweight
connects the air supply conduit 43 to the region
I1’serves to bias'íathe arcuate member l5 in a
counterclockwise direction to hold the valve mem 70 above the piston 42, whereby to force said pis
ber I3 against its seat I2. The other groove in
the arcuate member.. I5 is provided with the
» cable I3, one- end of which is fast with the arcu
ton downwardly to exert a pull on the cable 33
to raise the counterweight 31 to open the relief
valve
3l.
Y
_
.
'
- The piston rod 4I of the operating cylinder 43
ate member I5. Lifting of the cable i3'will tend
tn mise the; cnunterwelght l1 and move the 8.11311." 75 is provided with the cam 33, which> as the piston
2,411,487
5
rod moves relative to the operating cylinder“,
controls a pair of limit switches, which will be
described presently.
,
,
Reference will now be made to a number of
limit switches employed in the practice of the
present invention.
'
`
The motor P, as above indicated, operates the
crank Q, which in turn, at two extremes of its
travel, operates limit> switches 5I and 52. 'I‘he
motor Y, as above indicated, operates the crank
Z, which in turn, at two extremes of its travel,
v operates the limit switches 53 and 54.
The small bell operating cylinder H is adapted
to control the limit switch SBC and the large bell '
operating cylinder R is adapted to control the
limit switch LBC. The cam 29 movable with
the piston rod 20 of the‘equalizer valve operat
ing` cylinder 22 is adapted at the upper region of
.
6 `.
This pair of contacts LBC-i close as soon
large bell B leaves its closed position.
iisthe4
Limit switch 5| is biased to closed position and
is open when the small bell valve M is in bell
closing position.` Limit switch 52 is biased to
closedì position and is open when the small bell
valve M is Vin bell-opening position.
_
Limit switch 53 is biased to closed position and
is open when the large'bell valve W is in bell
closing position. Limit switch 54 is biased to
' closed position and is open when the large bell
valve- W is in bell-opening‘positlon.
-
Referring now to Figure 4, the various instru-`
mentalities above mentioned are shown diagram
„matically in an electrical control circuit. In
addition to the instrumentalities previously men
tioned, the diagram of Figure 4 shows the follow
ing instrumentalities:
its stroke to control the limit switch EVC and
The small bell push button SBPB includes a
at the lower region of its stroke to control the» 20Y walking beam operating member having the alter
limit switch EVO.
'
The cam 50 movable with the piston rod ’4| of
the relief valve operating’cylinder 43 is adapted
in the upper portion of its stroke to control the
limit switch RVC and at the lower region of itsl `
stroke to control the limit switch RVO.
natively operative buttons marked “Open” and
“Close." When the "Close” button is depressed,
a switch a is moved to open position and a switch
b is moved to closed position. When the button
“Open” is depressed. the switch a is moved to
closed position and the switch b is moved to open
The three-way valve. 25 for controlling the oper
position.
`
ating cylinder 22, which in turn controls the
VThe large bell push button LBPB is also pro
equalizer valve Il, is responsive to the solenoid
vided with a walking beam operating member
EV-solenoid, and the three-way valve 45 for con 30 provided with the alternatively operative but
trolling the cylinder 43, which in turn controls
tons "Open” and "Close'J’v Said large bell push
the relief valve 3|, is responsive to the solenoid
button controls the switch c, d and e. When the
“Close” button is depressed, switches c and d
Rif-solenoid.
`
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~ The various solenoids and switches abovemen
are moved to open position and the switch e
tioned are controlled from a panel CP supplied 35 is moved to closed position. vWhen the "Operi”4
by the electric conductors 55-55. The control
button is depressed, switches c and d are moved
panel CP is connected to the various switches and
to closed position and switch e is moved to open
solenoids through multiple wire cables, as illus~
trated in Figure 1. The circuits embodying said
As shown in the diagram of Figure 4:,A the
multiple wire cables, switches and solenoids will 40 motor P is provided with the armature Pa and
be clear from the diagram appearing in Figure 4.
with the two series iìeld windings Pb and Pc,
The valve 25 associated with the equalizer valve
which serve to operate the motor in two direc
|| is biased to a position corresponding to that
in which the region above the piston 2| .is con
Y
The motor Y is provided with the armature
nected to atmosphere, yWhen the ETV-solenoid is ~ Ya and with the two series iield windings Yb
energized, the valve 25 is positioned to cause
and Yc.
.
'
high pressure air to enter the region above the
The control panel CP also includes relays EVI,
piston 2|, thereby opening the equalizer valve ’ RV and EV, the operating coils of which are
position.
_
,
‘
tions.
i
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‘
A
indicated in Figure 4 by the reference letters
The valve 45 associated with the relief valve A50 .lust mentioned. The operating coil E'VI when
3| is biased to a position in which air under pres
energized is adapted to close the pairs oi contacts ‘
sure is introduced above the piston 42, thereby
EVI-i, EVI-----2 and EVI-3, which contacts are
opening the rel-iet valve 3|. So long as RV-sole
biased to open position when‘the coil EVI is not
Il.
'
«
Y
noid is energized. relief valve 3| is closed.
'
energized.
’
Limit switch EVC is provided with two pairs 55 The operating coil ` RV when energized is
of contacts EVC-_i and EVC-2. The pair oi? con
adapted to close the pair of contacts RV-l,
tacts EVC-i are closed when the equalizer valve
which contacts are biased to open position when
i i is closed, that is--when the piston 2l is up.
the coil RV is not energized.
The'pair of contacts EVC-lare open when the
The operating coil EVwhen energized is adapt
equalizer valve || is closed._
i
l
60 ed to close the pair of contacts EV--|, biased
Limit `switch EVC includes the pair of con
to oâien position when the coil EV is not ener
glze .
tact" EVO-l, closed when the equalizer valve Il
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_
The mode of operation oi' the above described
Limit switch RVC includes two pairs of contacts
embodiment of the present _invention is substan
RVC-I and' BVC-2, both of which `are closed 65 tially as follows:
when the relief valve 3|~is closed, that is-when
After a load of material has been charged upon
the piston 42 is up.
.
the small bell A, said> small bell may be opened
Limit switch RVO includes a pair of contacts
by pushing the “Open” button of the push but
RVO--L closed when the relief valve 3| is open.
ton SBPB. 'I'his closes the circuit through the
is op en.
'I'he limit switch'SBC for the small bell cylin- " 70 series iield winding Pb and armature Pa because '
der includes the pair of contacts SBC-i, >closed
of the fact that the limit switch contacts EVC-I
Awhen the small bell A- is closed.
.
.
The limit switch LBC for the large bell cylinder
are closed (equalizer valve V|| being closed) and A
limit switch contacts RVO-l are closed (the
includes the. pair of contacts LBC-i, closed at
relief valve 3i being open). 4'The motor P moves
all times except when the large bell _B is closed. 75 the valve M intoposition to raise the small bell
2,411,487 ,
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ing coil EV. causing the contacts EV-I to open,
`deenergizing the solenoid EV-solenoid, causing
cylinder H and open the small bell A. As soon
as the valve M is in this position, limit switch
52 opens and the motor 'P stops. Meanwhile '
limit switch 5I closes. When it is desired to close
the 'exhausting of air from the upper portion’of
the Acylinder 22, causing the equalizer valve || to
close.
the small bell, the “Close” button of SBPB is
depressed. This closes the .circuit through the
switch b and through the series field winding Pc
and armature Pa. The motor P moves the valve
M into position to lower the small bell cylinder
This causes the limit switch contacts
EVC-2 to open. When the. large bell B Vfully
closes, limit switch contacts LBC-I- are opened.
' Coil RV is now deenergized because contacts
,EVI-l, EVC-_2 and LBC--l are all'Open. Con
H and close 4the small bell A. As soon as the 10 sequently the contacts RV-I open, leading to
, the deenergization oi the solenoid RV-solenoid,
` valve M is in this position the limit switch 5|
opens and motor P stops. In this manner >the
small bell A is opened and closed. This cycle
may be repeated several times in order to'dis
,
thus causing the relief valve 3| to ì open.
The
cycle is thus completed.
.
The interlocking arrangement as illustrated
and describedY is of the forced type; that is, the
mechanisms under control must actually respond
and make their necessary movements in order
, charge `several loads of material upon the large
bell.
At intervals it will be desired to open the large
to actuate the limit switches whose contacts are `
bell B in order to discharge into the blast fur
included in the control circuits. The interlock
nace the material which has been delivered from
the small bell A. 'I‘he large bell B may be 20 ing arrangement is of the permissive type in that
opened by pushing the button marked “Open"
of the push button LBPB. 'I‘his closes the cir
cuit through the switch c, causing coil EVI to
be energized. 'I'he resulting closure of the con
tactor EVI-_I causes the coil RV to be ener 25
gized. This causes contactor RV-I to close,
it gives permission for certain’functionsy `to take>
place, but it also requires them to take place
as a prerequisite of bell-opening operations. 'I_'he
interlocking arrangement illustrated and de
scribed prevents the operations fromy taking place
under improper conditions.
.
-
l
Recapitulating certain advantages of the pres
ent‘ invention, the following may be mentioned:
leads to the closure of the relief valve 3|. The
1. The small bell A can open only when" the
instrumentalities in Figure 1 are shown as
though the operationwere stopped with the re 30 equalizer valve || is closed andthe relief valve
thus energizing the solenoid RV-solenoid. This
3| is open.
lief valve closed, the equalizer valve closed and »
' the large bell and small bell both closed.
v is a transient condition.
`
This
= Vrelief valve 3| is closed and the equalizer valve
Energization" of the coil EVI also results in the
|| is open.
closure of contactor EVI-2, completing a circuit 35
. through the coil EV as soon as the relief valve
|| closes (thereby closing the limit switch con
-
4. The relief valve 3| can be opened only
when the equalizer valve | I is closed and the
. cause the rsmall bell A is in closed position.
. Energiz‘ation of the- coil EV causes the closure 40 large bell B is closed»
closure of the contacts EVI-3, completing a cir
-
3. The relief valve 3| must be closed and the
small bell A_must be closed before the equalizerl
valve || can be opened.
' tacts RVC-D . Contacts SBC-l are closed be
_of the contactor EV---|, which causes energize
tion of the solenoid EV-soienoid.’ This leads to
the opening of the of the equalizer valve ||~. En
ergization of- the coil EV--l also results in the
~
2. 'I'he large bell B can open only when the
i
Though a preferred embodiment of the pres
' ent invention has been described in detail, many
modifications will occurl to thoseskilled in the
art. It is intended to cover all such modifications
45 that fall within the scope'of the appended claims.
What is claimed is:`
1. A blast furnace comprising, in combination,
amature Ya of the motor Y, since the switch
a furnace chamber, -a lowermost charging bell,
d is closed and the relief-valve 3| is closed
(whereby limit switch contacts yl'tVC--z are y a, topmost charging bell at the top of said cham- i
closed) and the equalizer valve || is open (whereaf 50 ber, said bells> being arranged in series with one
by limit switch contacts EVO--I are closed).
another, means for operating the lowermost of
said bells, means for operating the uppermost ofV
The motor Y operates to move 4the valveyWA to '
a position to cause a large bell operating -"cylinsaid bells, a by-pass conduit adapted to connect
der R to lift, opening the large bell B. As soon
the space between said bells with said furnace
as thc valve W has moved to the cylinder lifting 55 chamber, an equalizer vvalve in said conduit, mo
position the limit switch 54 is opened, stopping
tive means for said equalizer valve, a relief valve
the motor Y. Meanwhile the limit switch 53
for providing communication between the space
cuit through the series iield winding Yb and the
between said bells and atmosphere, motive means
for said relief valvefand means for interlocking
“Close” button oi.' the push button LBPB. This 60 said operating meansv for the uppermost of said
closes the circuit through the' switch e through
bells with said equalizer valve and said relief
the limit switch 53 and through the series field
valve to permit said uppermost of said bells to
winding Yc and the armature Ya. of the motor
open only when said equalizer valve is closed
Y. ’I'he motor Y operates in a direction to move
and said relief valve is open.
- ‘
closes.
-
‘
The large bell B is closed by. depressing the
the valve W into position for lowering the cyl
2. A blast furnace comprising, in combination,
a furnace chamber, a lowermost charging bell,
a topmost charging bell at the top of said cham
ber, said bells being arranged in series withv
inder R. As soon as the valve W attains this
position the limit switch contacts 53 open. Low
ering of the cylinder R results in the closure of
the large bell B.
'
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one another, means for operating the lowermost
AThe depressing of the “Close” button of LBPB
results in the opening of the switch c, which
leads to the deenergization of the coil EVI, re
sulting in the opening of contacts EVI-I,
EVI-_2 and EVI-3. Opening of the contacts
EVI-2 f .ruses the deenergization of the operat
of said bells, means for operating the uppermost
of said bells, a by-pass conduit adapted to con
nect the space between said bells with said‘fur
75
nace chamber, an equalizer valve in said conduit.
motive means for said equalizer valve, a relief
valve for providing communication between the
2,411,487
10
space between sai'd bells and atmosphere, motive
means for said relief valve, and means for inter
locking said operating means for the lowermost
of said bells with said relief valve and said equal
izer valve to permit said lowermost of said bells
to open only when said relief valve is closed
and said equalizer valve is open.
'
3. A blast furnace comprising, in combination,
valve to permit said equalizer valve to be opened
only when said relief valve and said uppermost
of said bellsl are closed.
4. A blast furnace comprising, in combination,
a furnace chamber, a lowermost charging bell,
a. topmost charging bell at the top of said cham
ber, said bells being arranged in series with one
another, means for operating the lowermost of
, said bells, means for operating the uppermost of
a furnace chamber, a lowermost charging bell,
a topmost-l charging bell at the top of said cham 10 said bells, a by-pass conduit adapted to connect
the space between said bells with said furnace
ber, said bells being arranged in series with one
chamber, an equalizer valve in said conduit, mo
tive means for said equalizer valve, a relief valve
for providing communication between the space
said bells, a by-pass conduit adapted to connect
the space between said bells with said furnace 15 between said bells and atmosphere, motive means
for said relief valve, and means for interlocking
chamber, an equalizer valve in .said conduit, mo
said relief valve, said equalizer valve and said
tive means for said equalizer valve, a relief valve
operating means for the lowermost of said bells
for providing communication between the space
to permit the opening of said relief valve only
between said bells and atmosphere, motive means
for said relief valve, and means for interlock 20 when said equalizer valve is closed and said low
ing said relief valve and said operating' means
ermost -bell is closed.
for said uppermost of said bells and said equalizer
ARTHUR. J. WHITCOMB.
another, means for operating the lowermost> of
said bells, means for operating the uppermost of '
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