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Патент USA US3063765

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Nov. 13, 1962
P. w. J. WIJDEVELD ETAL
3,063,755
DEVICE FOR AUTOMATICALLY TRANSPORTING DRY GRANULAR MATERIAL
Filed March 28, 1960
mvsu'rons
PETRUS W.J.WIJDEVELD
FRANS SCHOLTZE
BY‘; ADRIANUS F. BOSTERS
United States Patent
ice
2
1
device described above is introduced into a vessel con
3,063,7 55
DEVICE FOR AUTOMATICALLY TRAN§PORTWG
DRY GRANULAR MATERIAL
taining, for example, polyvinylchloride-acetate grains, the
mouthpiece 6 is urged against the lower end of the duct 1,
so that there is no possibility for the lower end of the
duct 1 to contain a quantity of grains, which can not be
conveyed. As soon as the mouthpiece 6 touches the bot
Petrus_Wilhelmus Jozef Wijdeveld, Frans Scholtze, and
Adrianus Franciscus Boaters, Baarn, Netherlands, as
srgnors to North American Philips Company, Inc, New
York, N.Y., a corporation of Delaware
_
tom of the vessel, the spring urges the transport duct 1
Filed Mar. 28, 1960, Ser. No. 18,152
Claims priority, application Netherlands Mar. 31, 1959
2 Claims. (Cl. 302-58)
3,853,755
Patented Nov. 13, 1962
upwards, so that a space is formed between the end of
the duct 1 and the mouthpiece 6. If air is then introduced
10 into the pipes 9 and 12, the ?ow of air through the jet pipe
The invention relates to a device for automatically
transporting granular material.
It is frequently necessary to transport dry granular ma
terial with a minimum of manual handling in order to
‘7 agitaté‘s a quantity of grains.
The grains obtain a cer
tain initial velocity and the air flowing through the jet
pipes it] sucks up the agitated grains, which already have
a certain velocity and transports them further.
When
prevent contamination thereof. This is particularly the 15 such a quantity has been transported that the opening of
case when the material is granulated polyvinylchloride
acetate, especially when used for pressing phonograph
records. ‘It is also important that the transportation of
the material be stopped automatically when the storage
vessel to which the material is being conveyed is ?lled to
a predetermined level and then be resumed automatically
when the amount of material drops below a certain level.
In accordance with the invention we transport the granu
lar material by means of a device in which the material
is agitated and then transported by a stream of gas into 25
the transport duct in the vessel, to which the grains to be
transported are supplied, is ‘completely closed, no grains
are any longer transported, since the opening cannot be
blown free, so that no ?ow of air occurs any longer in
the duct. When the opening is again free, the material
being removed from the vessel, for example via a drain
in the bottom or" the vessel, the transport is automatically
resumed. With the device described above, a pipe diam
eter of 20 mms. and an air pressure of 3 to 4 atmospheres
permitted of transporting per hour 180 kgs. of grains of
polyvinylchloride acetate with a speci?c weight of 1.36 up
to a height of 4 metres. The air is previously puri?ed
by passing it through a ?lter. Any contamination of the
polyvinylchloride is thus avoided. The device itself can
particularly the device, according to the invention, is
characterized in that provision is made of a transport duct, 30 be manufactured in a simple manner and it should be noted
that, for example, no cyclone is required to separate the
which has a mouthpiece provided with a central jet pipe
material to be transported from the air. Moreover, it is
and located at a certain distance from the sucking end
found that a comparatively small quantity of air is re
of the transport duct and capable of closing completely
quired to transport of the aforesaid quantity.
the mouth of the transport duct against the pressure of a
What is claimed is:
spring, whilst during operation a gas under a compara 35
the storage vessel through a tubular member which is
provided at one end with a closure ‘member by which the
how of the material can be readily controlled. More
tively high pressure is conveyed through each jet pipe and
1. A device for transporting dry granular material from
the transport duct is furthermore provided with one or
one storage vessel to a second storage vessel, comprising
‘a tubular transport member having an inlet opening
more jet pipes arranged in the wall thereof and extend
adapted to be imbedded in the material and an outlet open
ing approximately in the direction of transport, which
pipes are fed, during operation, also by a gas under a 40 ing adapted to be arranged in the vicinity of the second
‘storage vessel, a compressed gas jet mounted on said
comparatively high pressure.
member with its ori?ce within the member and directed
According to a further aspect of the invention the
toward the outlet opening, a closure member movably
mouthpiece is secured by means of at least two guides to
mounted on said member at the inlet opening, resilient
a sliding piece surrounding the transport duct, one of the
45 means urging said closure member away from the inlet
guides being used as a supply duct for the gas.
opening to form a space, and a compressed gas jet mounted
The invention will be described more fully with refer—
on said closure member and directed through said space
ence to the drawing, which shows one embodiment of the
toward the inlet opening.
’
device according to the invention and is a sectional view
2. A device as de?ned in claim 1 and further comprising
of the end of a transport duct.
In the drawing, reference numeral 1 designates a trans 50 a plurality of rod-shaped members slidably mounted on
said transport member and supporting said closure mem
port duct, which has a gland 2, secured rigidly to the
ber, and means to supply gas to the compressed gas jet
duct. At the end of the duct is provided a sliding piece
on the closure member including a passageway formed in
3, which is adapted to slide along the duct, and between
one of said rod-shaped members.
_ the sliding piece 3 and the gland 2 is provided a pressure
spring 4. The duct is provided with a bent-over edge 5, 55
References Cited in the ?le of this patent
so that the sliding piece 3 cannot be removed fro-m the
duct. A mouthpiece 6 is provided with a jet pipe 7 and
UNITED STATES PATENTS
is secured by a connecting rod 8 to the sliding piece 3.
469,175
Schutte ______________ __ Feb. 16, 1892
The other connection between the sliding piece 3 and the
528,417
Duckham _____________ __ Oct. 30, 1894
mouthpiece 6 is formed by a duct 9, to which a duct for 6 O
850,639
Gebhardt _____________ __ Apr. 16, 1907
compressed air is connected. The air has an overpressure
1,305,726
Leonard _______________ __ June 3, 1919
of 3 to 4 atmospheres.
In the wall of the duct are further
more provided a plurality of jet pipes 10, which are
housed in a housing 11. This housing has a connection
12, through which also compressed air of 3 to 4 atmos 65
pheres can be introduced into the housing 11. If the
2,561,148
2,661,244
2,676,852
2,703,732
2,774,636
Snow ________________ __ July 17,
Baily _________________ __ Dec. 1,
Kirkbride ____________ __ Apr. 27,
Schutte _______________ .._ Mar. 8,
Whitlock _____________ __ Dec. 18,
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