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Патент USA US2553235

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May 15, 1951
2,553,234,
J. BOUCHER
' commromzus PLANT FOR MOLDING smn
Filed July 2; 1948
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Patented May 15, 1951
2,553,234
UNITED STATES PATENT. OFFICE‘.
2,553,234
CONDITIONING PLANT FOR MOLDING SAND
Jacques Boucher, Paris, France, assignor to
Pompes Noel, Liverdun, France, a French com
Dally
Application July 2, 1948, Serial No. 36,789
In France August 1, 1946
4 Claims. (CI. 22—89)
1
The invention relates to a plant for condition-.
ing moulding sand.
It is well known that moulding sand can be
used over several times provided that, after each
time it is used, it undergoes the following opera
2
it up and empties it in a small chute-3. The sand
then falls in 4 on a conveyor belt winding around
a magnetic drum 5. The metallic particles are
retained by said drum 6 and fall in 1 into a chute
8 which discharges them in truck 9.
tions: crushing, breaking up, cooling, dampening
The sand, cleared of its metallic particles, flows
and, if necessary, enriching with a binder.
according to arrow i2 into a hopper I0 and falls
Up to now this treatment has always required
into II in the centre of a round table I2, rotated
a rather long time, especially for the cooling and
with a uniform speed around its axis XX. Two
moistening to penetrate to the core of the sand. 10 crushing rollers i3, movable around a horizontal
For this reason, all large sand processing works
stationary axis YY, are rotated by the circular
must have a large reserve of sand. This has many
motion of table I2. A pipe I4, provided with a
drawbacks, mainly the following:
cock Iiia and opening above the spiral conveyor
The necessity to prepare a large quantity of
I enables one to add the water necessary for re
sand, and di?iculty in rectifying the composition
thereof according to‘ manufacturing needs;
The necessity for large sized bins, therefore
moistening the sand. Furthermore, fresh sand
and binder are poured on the table I2 of the
crushing device I3.
of bulky dimensions;
A regulating feeding scraper I5, placed ob-l
The need for raising the sand to the top of the
liquely at a point of the periphery of the table I2,
bins with the help of special elevators entailing 20 causes the crushed sand to slide gradually onto
a huge consumption of power.
a chute I6, whence it falls on a ?rst belt con
The present invention has for its object to
veyor H, which is, for instance, made of rubber,
provide an improved conditioning plant for
and is actuated at a high speed. The surface of
moulding sand and similar materials, in order
said conveyor is furnished with thin projecting
25 plates 13 which drive the sand and throw it for
to avoid said drawbacks.
The invention has more especially for its ob
ward, in a very ?nely divided state, into a ?rst
ject to provide a plant wherein the sand or other
chute I9 provided with a hood 20 intended to
material at the beginning of the conditioning
avoid losses of sand. During this sand throwing
thereof is brought down to a sufficiently low tem
and owing to its very ?nely divided state and high
perature, and to a sufficiently consistent degree of
speed, the sand undergoes a ?rst and intensive
30
dampness so as to be immediately reused, with
cooling, as well as a, marked breaking up._
out necessarily remaining in a cooling and stabi
This operation is repeated several times.
lizing bin. The quantity of sand necessary may
In the embodiment shown in Fig. 1, on coming
therefore be very greatly reduced.
out of chute I9, the sand immediately falls on a
Said plant comprises means allowing the sand,
second conveyor belt 2|, similar to belt II, which
or other material, to undergo several continuous
throws it into a second chute 22, similar to chute
and simultaneous operations of breaking up, mix
I9 and likewise provided with a hood 23. The
ing and cooling between the reception station for
sand thus undergoes a second intensive cooling
used material and the utilization station of the
and a second breaking up. On coming out of
regenerated material.
40 said chute 22, the sand falls on a third conveyor
Other features and advantages will be evident
belt 24 which may be actuated at a higher speed
from the following description.
than belts I‘! and 2| and/or be more steeply
On the accompanying drawing, given merely
sloped so as to throw the sand, which has under
by way of example:
‘
gone a third intensive cooling and breaking up,
Fig. 1 is a diagrammatic elevational view of 45 into a bin 25 provided with a hood 25a where it
a plant according to the invention;
is collected in 25. The bin 25 bears at its base
Fig. 2 is a vertical section along line 2—2 of.
a trap-door 2'! whence the sand flows towards
Fig. 3, of another embodiment;
the utilization station.
Fig. 3 is a corresponding front view;
By passing over several successive conveyor
Fig. 4 is an elevational view of another em 50 belts with plates, said sand becomes completely
bodiment.
divided and mixed, thus allowing the added water
According to the embodiment shown in Fig. 1,
to ?lter through the grains and ensuring a rapid
the used sand of a reception station is brought by
remoistening, uniform and thorough.
a spiral conveyor I moving according to arrow I1
Furthermore, by repeated coolings which it
up to the base of a bucket elevator 2 which hoists
undergoes while passing at'high speed through
2,553,284
3
4
This embodiment has the same advantages as
those of the apparatus of Figs. 2 and 3. Further
more, the shock caused by the ?rst jet with the
the atmospheric air, the sand is brought down to
a temperature suf?ciently low to be immediately
used again.
plates of the second belt enables a more nearly
Bin 25 is no longer used for cooling and damp
ening of the sand but exclusively for its stock- 5 perfect breaking up, and the high speed reached
by the sand after its journey on two consecutive
ing, and its capacity is as low as the differences
belts; ensures :to; said sand a'jet, of a greater
between the feeding and utilization, rate will»
height, thus enabling, in the case of big volumes
‘allow.
'
ofjistorage, the doing away with any other eleva
The embodiment described above therefore.“
enables all the operations necessary for the re- 10 tional means.
Theinventiouis, of course, not limited to the
generation of old sand, and the-transport‘there
tion station without makingllSQof large; binsnorz
above. described embodiments which have merely
beengiven by ‘way of examples. Thus in Figs. 2,
arrows f4 and ‘f5 whence it is again sprayed in jets
as'described above. On the contrary, the~top
front'wall provided with" an aperturetherein and ‘
of from the regeneration stationto .the utiliza-r
3 and 4, the means'enabling the splitting up of
important labour or a great quantity of sand.
The embodiment shown in Figs. 2 and 3 does 15 ,7 thejet intotwoparts whereby one returns rear
wardly, may naturally be embodied in any other
not di?er from the preceding one, except that the
manner. The number of circuits may embody
sand, instead of passing on several successive
any suitable number of closed cyclic paths.
conveyor belts, passes several times on the'same '
Having now described my invention what I
conveyor belt, while operating in closed circuit.
On ‘coming out of chute 16, the sand falls on belt 20 claim1-as~~~new» and desire-'1 to secure by Letters
Patent is:
>
28-similar to the conveyor belt of the example of
1. In" a--p1ant ‘for ‘conditioning moulding sand,
Fig; 1 but actuated at a high’ speed and inclined
the»~combinationi~of-- a sloped conveyor device
at fagreater angle.
adapted-to throw from itsupperenda divergent‘
The sand is thrown forward-at 29,- according
'to'arrow f3, in a ?nely separated state and scat- 25 aerialiljetlofsand; a‘storagebin‘ located a rela?
tively short-distance from-said upper end‘ of said "
.tered in the form vof a jet 3D." The top part0?
convey-or deévicebutspaced therefrom, said'stor
.said-jet enters at 3| into a'bin- 32 provided at its
age’ bin“ having a Y front-wall‘ provided "with? qan-i
base- with a trap-door 33, whilst the bottom part
apertureythereinl and a rear wa'll~and'hood;ga_nd~a
iofa-e-said- jet does not reach the entrance of the
lbin;'»it is- stoppedby the wall ‘of said bin and 30 sloped chute-?ttedto-saidfront Wall and'open-j
ingcat its lower end; above the lower part of said"
' again-falls at 34 into a rearwardly sloped chute.
conveyor device;
.Said- chute is divided into two branches 3%? and 3'!
2. ,In "a plantv ‘for conditioning moulding sand,
(Fig.3) which'passon each side of the belt con
the combination .of a sloped conveyor adapted to '
veyor 28,;3116,‘ converge‘ at their bottom outlet, ' at
138;~‘~ above the base-of'said belt 28.- The "sand 35 throw fromitsuppenenda divergent aerial‘jet
of " sand, ‘a storage ‘bin located‘av relativelyshort
‘which has not entered the bin 3|,-again falls at
distance from said upper end .01" saidconveyor"
138 through said chute 35 on belt 28 according to
but: spaced therefrom; said storage bin *havinga.
portionof the sand jet having entered at St into - 40 a rear wall and hoodrandga sloped chute'fltted"
to ‘said, front wall; said .chutebeing formed of two
branches; which skirt said, 'conveyor,. the; lower ‘1
the bin 32 accumulates at -39 and may be used’
again?"
The sand throwing distance of belt 23 is regu-v
latedby varying its speed and/or its slope, so
edge‘ of "each ' of said branches opening above, the,"
lower part of saidconveyor' device;
that only a-third of the sand, for instance, enters 45 . 3..In_.a plant. iorconditioning moulding sand, .
thézcombiriation of “a sloped endlesslconveyor
thebin 32, the excess sand, again- falls-on bel-t'28,
beItQadaptefd to throw from its upperendfa diéf
therate of which is multiplied by three with vre
vergent aerial ‘jet. of send...‘ a stoiragebin located. l
spect to the utilization rate due-to the successive
fallsr- Therefore; the sand haccomplishes an
a rclatively'short distance from said upper end-i
average oftwo closed circuits in addition-to its 59 of said 'beltfbut‘spacedtherefrom, said. storage]
direct itinerary,-thus undergoing a breaking up
bin having a front wall provided with an apertur_e_,.
which ensures the desired dampening and- cool
therein and a reanwall andhhogdb 94min. SlQP?l;
chute?tted to said vfront wall,‘ ‘said chute‘ being
mg.
Owing to this arrangement, the sand condi
formedjof two branches which" skirt said ‘con-v
tioning-plant is greatly simpli?ed and its dimen~~ 55 veyqr be1t;the lower edge of each of said branches '
sions are particularly reduced, thus leadingto
openingiabove the'lower part ‘of th'eupper face of .
very important savings concerning space taken
up as well as manufacturing costs. The mainte
4; In a plant for conditioning moulding sand,‘
nance and power costs concerning only a very
the combination of two sloped‘ endless conveyor
reduced number of very simple apparatus ensure so belts’in series, the'second of said .belts'being,
very economical working of the plant. Further
adapted to throw from its upper end a diver;
gent aerial jet 'of sand, a ‘,storagebin located a.
relatively short distance from‘said upper' end .of'
scribed.
.
said second belt but spaced. therefrom, said stor
According to the example shown in Fig. 4 thee-6 age .bin_ having a ‘front wall“ provided withian'
spraying apparatus'is composed of a ?rst belt
aperture therein and‘a- rear wall and hood, and.
with plates 45], of slow speed- and little slope,v
a sloped chute ?tted'i'to?said"frontr‘wall, vsaid"
more, the use of labour is reduced to the super- -
vision '- and maintenance of the appliance de- 7
which throws the sand on a second belt GI {more \
chute being'ifrormed' of two branches/which skirt
sloped. than belt 136 and actuated at a higher’
s'aid'secondbelt; the lower’edge'of each_ of said .
speed.~ ‘Said belt 4| throws the sand towardsbin I 70 branches opening, above the lower part'g'of the
32in .which it partly enters ashereinbefore: de
upperv face of the ?rst-of said belts;
scribed, the remaining- sand falling again through =
the chute*35,'1similar to chutes 30 of Figsx2 and 3,
onthe?rst belt d?ithus being replaced ‘in a closed:
circuit.
JAGQUES "BOUGHER, ‘1
75
(References on following page)
5
2,553,234
REFERENCES CITED
The following references are of record in the
?le of this patent:
UNITED STATES PATENTS
Number
Name
Date
780,349
Johnson __________ __ Jan. 17, 1905
1,559,916
1,912,837
Royer __________ __v__ Nov. 3, 1925
Goldberg _________ __ June 6, 1937
6
Number
2,128,848
2,456,769
Name
Date
Rafetto __________ __ Aug. 30, 1938
Christensen ______ __ Dec. 21, 1948
FOREIGN PATENTS
Number
391,609
513,516
Country
Date
Great Britain _____ __ May 4, 1933
Germany _________ __ Oct. 25, 1928
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