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Патент USA US2127693

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Aug. 23, 1938. '
_w. A. M'cCANLES-S ET AL
2,127,693
PNEUMATIC CEMENT CONVEYER
INVENTORS
WILL/AM A. MCCANLESS
ROBERT R. HENDERSON
ATTORNEY.
Patented Aug. 23, 1938
2,127,693
UNITED STATES
PATENT OFFICE '
2,127,693
PNEUMATIC'CEMIENT C‘ONVEYER
William A. McCanless and Robert E. Henderson,
Merced, Cali?,v assignors t0 Yosemite Portland
Cement Corporation, Merced, Calif., a corpora.
tion of Delaware
Application April 16, 1937, Serial No. 137,261
'7 Claims. (Cl. 302-—50)
This invention relates to pneumatic conveyers
for ?nely divided or pulverulent materials, and
particularly to means for continuously forcing
dry Portland cement powder through conduits or
pipes which may be several hundred feet long,
from grinding mills to storage silos, by means of
air under pressure.
'
The principal object of the invention is to pro
vide improved apparatus for the above mentioned
10 purpose which- will be more‘ effective than prior
apparatus used for this purpose.
'
I w
A feature of the invention is to provide a con
trol of the air blast around the foot of the column
air released for conveying purposes cannot strike
back into the source of supply of the powder (see
Patents Nos. 1,202,088 and 1,258,911) . Our appa 5
ratus operates on the same principle, but is con
siderably improved in construction over the prior
apparatus used for this purpose, and gives better
control over its operation.
In the drawing 'I is a gravity feed chute as lead
1O
ing the cement output of one or more grinding
mills by gravity to a horizontally disposed cylin
drical spiral conveyer box 2 in which is revolvably
of ?owing cement.
positioned a spiral conveyer 3 mounted on a
Another feature is to provide a revolving pro
peller to continuouslycut oil cement from a com
pacted air-sealed feed column of cement and
15
hollow shaft 4.
The spiral conveyer ?ts nicely within its box or
throw it outward into the air blast.
?ight construction of gradually decreasing pitch
_
cylinder and is here shown as of double lead or
A still further feature is the longitudinal adjust
ability of the propeller in relation to the compact
toward the right-hand end so as to gradually
compress toward that end the material being con
veyed by it in direction of the arrow from the
chute I. The ?ight of‘ the conveyer may be of
triple‘ or single lead if desired, though we have
found that the double lead ‘seems to operate more
ing screw.
e?iciently.
A further feature is an independent drive for
such a propeller so that it may be operated at
high speed unaffected by the motion of the com?
pacting screw.
_’ I
A further feature is the provision of air booster
nozzles adjacent the propeller to aid in throwing
the loosened cement out into the main air stream.
A further feature is the provision of a cylinder
30 around the propeller extending forward of the
same into the main air stream.
-
A still further feature is the provision of per
forated air ejecting pipes around the propeller
housing and means for adjusting the angularity
35 of the issuing air streams.
Other features and advantages of our invention
will appear in the following description and
accompanying drawing.
In the drawing:
Figure 1 is a vertical section taken centrally
through our improved pneumatic cement convey
25
The hollow conveyer shaft 4 passes out of the
closed end 5 of the box through a suitable stuffing
box or gland 6 and is rotatably supported in one
or more bearings as at 'l and has a driving gear 8
secured to it and preferably a ball or roller thrust
collar interposed between the gear hub and the
bearing as indicated at 9.
For the purpose of handling ground Portland
cement, the spiral conveyer may be from about "
four to six inches in diameter, and at its forward
end the conveyer box is ?ared outward as at I0 to
a larger size‘ and continues forward for about a
foot as a larger cylinder I I, while surrounding and
enclosing this'larger'cylinder II is a rectangular
steel casing I2 closed at its rear end I 3 and welded
or otherwise attached to cylinder I I so as to form
Figure 3 is an enlarged vertical section of the
an air-tight juncture therewith.
Casing I2 is open and ?anged at I4 at its for
ward end and connected to a similarly ?anged
conical discharge pipe or duct I5 which tapers
propeller shaft mounting and associated parts.
Before describing the drawing in detail, it may
down to a round outer'end I5’ where it connects
to the conveyer pipe I6 for conveying the cement
be stated that broadly it is old to continuously ~
deliver a column of ?ne loose or powdered mate
rial to a spiral conveyer or compressing screw
operating withinv a pipe to form a slowly advanc
to the silo or other point desired.
ing apparatus.
'
_
Figure 2 is a cross section of Figure 1 as seen
from the line 2—2 thereof.
55
object of the screw compressed column being to
obtain an air seal through which the compressed
~
_
ing column of tightly compressed material, and
then to apply air pressure to material released
from the forward ‘end of this column to force vit
Within the hollow spiral'conveyer shaft 4 is a
propeller drive shaft I‘! to the inner end of which
is attached a bladed propeller I8 for the purpose
of cutting off and throwing a continuous’ rotary
stream of cement from the compacted mass at its
rear out through the forward end of cylinder I I
through a pipe to thewpoint oi‘destination, the
into- casing I2.
-
'
55
2
2,127,693
charge end pulverulent material received at the
other end, an enlarged casing enclosing the dis
propeller shaft II is revolvably supported in oil
less bushings I9 ?tted within the-outer end of hol
charge end of the screw conveyer communicating
with a discharge pipe for conveying the material
low shaft 4 and sealed against back pressure of air
to the desired point, means for forcing a stream
10 as by packing 20 held in place as by a threaded
rected generally toward said discharge pipe, a ro
At the outer or rear end of the propeller shaftv
is a driving pulley 23 and its supporting bearing
24. A yoke collar 25 on the propeller shaft be
tween bearings ‘I and 24 ?tted with a yoked shift
ing lever 26 provides for slidi-ngthe propeller shaft
longitudinally. The yoke lever may be moved
screw conveyer arranged for ejecting material
from the screw conveyer into said enlarged casing
for taking up by said air stream, and means oper 15
able ~from without the casings for adjusting said
propeller longitudinally of the screw conveyer to
ating a traveling yoke nut 29 engaged by the
shifting lever 26. By this means the propeller
may be adjusted in cylinder I I and locked at any
position while free to rotate.
To inject air into the rear of casing I2 for forc
25 ing the powdered material through and out of
cone I5, four perforated pipes 30 for compressed
air are provided in quadrangular arrangement
around cylinder II and the perforations 3| are
directed forwardly in a manner to make the air
30 streams converge.
To provide for proper angular adjustment of
the perforations, we may gear all of the pipes to
gether for simultaneous rotation as one is turned.
Such gearing is shown in Figure 2 at 32. A bear
35 ing block 33 at each corner passes one of the pipes
for turning and also revolvably supports the
closed end of the adjacent pipe as indicated.
Each of the pipes is providedwith a suitable
sleeve joint 35, to permit turning while each is
40 connected to a service air pressure pipe 35. A
handle 36,may be provided on any one of the
pipes for simultaneously turning all of them and
the outer end 3'! of the handle crank arm may be
used as an indicator against suitable graduated
45 points 38 arranged on the casing;
Besides the forward ejection of compressed air
from perforated pipe 30, we provide several for
wardly directed jet pipes 39 extending through
the sides of cylinder II just in front of the pro
50 peller I8.
These jets receive their air from a
branch airpressure pipe line 40 under separate
valve control 4 I.
‘
By the construction ' and arrangement de
scribed, the powdered material from chute I to be
55 conveyed is, in the operation of the apparatus,
tightly compacted in the forward end of the con
veyor box 2 against reverse flow of air,v sliced off
by the rapidly spinning propeller and thrown for
ward in cylinder II to be picked up by jets 39,
60 which are preferably spirally arranged, and given
a further spinning motion as it is hurled outward
into the main air stream issuing from perforated
pipes 30 all around cylinder I I and rapidly carried
away through conical section I5 to the conveying
65
pipe line.
,
.
While the apparatus has been developed partic
ularly for the pneumatic conveying of cement, it
may be adjusted through the means shown so as
to successfully handle many kinds of ?nely di
70
of compressed air from said enlarged casing di 10
self-tightening gland 2 I.
either way and locked at any'point as by a bolt 21
projecting from a lug 28 on bearing 24 and oper
20
We claim:
1. In a pneumatic conveyer of the character de
scribed, a screw conveyer operatively mounted in
a casing and arranged for compacting at its dis
It is desirable that this propeller be longitudi
nally adjustable in cylinder II to best suit the
characteristics of various grades of ground mate
rials being handled by the apparatus and to this
end it is preferably provided with the shaft
mounting as best shown in Fig. 3, and wherein the
vided materials.
,
Having thus described our improved pneumatic
conveying apparatus, it will be evident to anyone
skilled in the art that minor changes may be
made within the. spirit of the invention and scope
75 of the appended claims.
tary propeller adjacent the discharge end of said
regulate its distance from the discharge end
thereof.
'2. Ina pneumatic conveyer of the character
described, a screw conveyer operatively mounted
in a casing and arranged for compacting at its
discharge end pulverulent material received at the
other end, an enlarged casing enclosing the dis
charge end of the screw conveyer communicating
with a discharge pipe for conveying the material
to the desired point, a compressed air pipe ar
ranged in said enlarged casing provided with ori
?ces directed generally toward said discharge
pipe, a propeller adjacent the discharge end of
said screw conveyer arranged for ejecting mate
rial from the screw conveyer into said casing for
taking up by the air stream from said compressed
air pipe, and an extension of the screw conveyer
casing embracing said propeller and projecting ‘
forward of the same into said enlarged casing.
3. In the construction speci?ed in claim 2,
means for ejecting compressed air into said ex
tension in forwardly directed jets.
4. In the construction speci?ed in claim 2,
means for ejecting compressed air into said ex
tension in forwardly and spirally directed jets.
5. In a pneumatic conveyer of the character
described, a screw conveyer operatively mounted
in a casing ‘and arranged for compacting at its
discharge end pulverulent material received at the
other end, an enlarged casing enclosing the dis
charge end of the screw conveyer communicating
with a discharge pipe for conveying the material
to the desired point, and a plurality of straight
compressed air pipes in said enlarged casing ar
ranged about the discharge end of said screw con
veyer and provided with perforations in their side
walls directing air jets forward of said conveyer
casing toward said discharge pipe.
6. In a pneumatic conveyer of the character
described, a screw conveyer operatively mounted
in a casing and arranged for compacting at its
discharge end pulverulent material received at the
other end, an enlarged cas'mg enclosing the dis 60
charge end of the screw conveyer communicating
with a discharge pipe for conveying the material
to the desired point, a plurality of straight com
pressed air pipes in said enlarged casing arranged
about the discharge end of said screw conveyer
and provided with perforations directed generally
toward said discharge pipe, and means for turn
ing said compressed air pipes to alter the direc
tion of air streams from said perforations.
70
'7. In a pneumatic conveyer of the character de
scribed, a screw conveyer operatively mounted in
a casing and arranged for compacting at its dis
charge end pulverulent material received at the
other end, an enlarged casing enclosing the dis 75
2,127,898
charge end of the screw conveyer communicating
with a discharge pipe for conveying the mate
rial to the desired point, a plurality of straight
compressed air pipes in said enlarged casing ar
3
generally toward said discharge pipe, and means
for simultaneously turning all of said compressed
air pipes to alter the direction of air streams from
said perforations.
ranged about the discharge end of said screw con
WILLIAM A. MCCANLESS.
veyer and provided with perforations directed
ROBERT R. HENDERSON.
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