Conveyors: fluid current – Intake to fluid current conveyor – Movable inlet
Patent
1980-10-29
1982-12-14
Nase, Jeffrey V.
Conveyors: fluid current
Intake to fluid current conveyor
Movable inlet
222160, 222167, 406118, 406137, B65G 5340
Patent
active
043635741
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of emptying a powder or like material out of a container.
PRIOR ART
So-called bulk handling of powdered material has increased and may be expected to increase further in extent in future. Typical examples of materials which can be bulk handled are lime, cement, flour, fertilizer, resin etc. but other materials which are difficult to handle such as electrode filter dust and sticky powdered fodder occur.
Powder material is emptied (after transport by road or railway) out of the vehicle by means of compressed air or by tipping.
Heavy powder material is often transported in almost spherical containers which are subjected to excess pressure during emptying, while at the same time a stream of carrier air is blown into the discharge pipe at the lower part of the container. The material is "fluidized". Spherical containers afford a poor utilization of volume.
Light powder material can be transported, particularly in road vehicles, in horizontal cylindrical containers or silos (so-called bulk containers). Emptying can be effected by tipping, particularly with coarse grained material, while at the same time an internal excess pressure may prevail in the container. A container length of 10-12 m and an emptying angle of 45.degree. provides an obvious element of risk, for example the risk of tipping with gusts of wind. If the container then cracks, a powerful explosion may occur because of the excess pressure with consequent damage to life and property.
With both these methods of emptying, the emptying is effected in what is in itself the most natural manner, namely from the bottom. A serious common disadvantage with both methods is the risk of arching with consequent serious risky disturbances in connection with the emptying. At present attempts are made with varying success to avoid arching by means of vibrators, sound typhoons and like aids.
It is also known already to empty upright containers from the top. Here a shaft is used in the container (the silo). This consists of small tubular elements which, by means of guide and lifting members, can form an emptying gap in the shaft at the surface of the powder in order to empty the powder by the force of gravity. The device is comparatively expensive and complicated, so that disturbances in operation are not excluded.
THE INVENTION
The advantage of emptying from the top--the powder is not packed at the surface--by so-called surface runoff, can be utilized and all the disadvantages of previously known methods avoided if, according to the invention, the powder is conveyed out of the container from its free upper surface by means of a stream of carrier air in a carrier-air pipe provided with openings for the powder. In order to achieve a reliable introduction of the powder into the carrier-air pipe at all its openings, a stream of secondary air from a secondary-air pipe should be caused to flow to the openings in the carrier-air pipe. If the container is horizontal and cylindrical, the container with a carrier-air pipe fixed therein, should be turned about its longitudinal axis so that the pipe is always in a suitable position at the surface of the powder.
LIST OF FIGURES
The invention will be described in more detail below with reference to the accompanying drawings
in which FIG. 1 shows in perspective a cylindrical container with members for emptying according to the invention,
FIGS. 2-4 show, in suitable cross-sections through cylindrical containers, three different embodiments of the invention and
FIG. 5 is a partial longitudinal section on the line V--V in the embodiment according to FIG. 3.
DESCRIPTION OF PREFERRED EMBODIMENTS
A cylindrical container 1 shown in FIG. 1 is disposed horizontally in a framework 2 to form together with this a so-called tank container or bulk container. As can be seen from the drawing, the container 1 is rotatable about its longitudinal axis in the framework. In the case shown, the rotation can be effected by means of a motor 3 fixed in the framework 2 and a drive belt
REFERENCES:
patent: 1922330 (1933-08-01), Robinson
patent: 2219208 (1940-10-01), Knight
patent: 2256561 (1941-09-01), Hoelscher
patent: 2501047 (1950-03-01), Gustafsson et al.
patent: 2518514 (1950-08-01), Anderson
patent: 2643796 (1953-06-01), Gustafson
patent: 2678238 (1954-05-01), Schutz
Brown Laurence R.
Dynatrans AB
Nase Jeffrey V.
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