Dispensing – Movably mounted supply container – Rotatable
Patent
1988-05-31
1990-04-03
Skaggs, H. Grant
Dispensing
Movably mounted supply container
Rotatable
222239, 222410, 222274, 222290, B67D 564
Patent
active
049133209
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to the field of metering of bulk materials, and more specifically, it deals with volumetric metering apparatuses, preferably for metering pulverulent materials.
BACKGROUND OF THE INVENTION
Known in the art are various types of volumetric metering apparatuses for bulk materials. Thus known in the art is an apparatus (SU, A, 598822) comprising a vertically extending receiving hopper having a guide funnel in the bottom part thereof and a disc with a discharge opening mounted therebetween for rotation about vertical axis. Rotation of the disc progressively disrupts equilibrium of material over the discharge opening within a so called vault or bridge, and the material moves under gravity through the discharge opening into the guide funnel.
This apparatus is deficient in a low metering accuracy because dimensions of the vaults, hence quantity of the material passing through the discharge opening per unit of time largely vary and are probabilistic.
Also known in the art is an apparatus (SU, A, 401616) comprising a vertically extending receiving hopper having a disc with a discharge opening provided in the bottom part thereof for rotation about vertical axis and a tripping knife mounted above the discharge opening in an inclined position with respect to the disc surface.
This apparatus is deficient in a low metering accuracy because the tripping knife overcoming resistance of the bulk material would deform it thus causing irreversible and uncontrollable changes in density.
In addition, the inclined surface of the tripping knife initiates settling of the material in the hopper over the discharge opening thus resulting in inadvertent discharges of the material which is also detrimental to the metering accuracy.
SUMMARY OF THE INVENTION
An object of the present invention is to eliminate the above-mentioned disadvantages of the known apparatuses.
The main object of the present invention is to provide an apparatus for volumetric metering of bulk materials construction arrangement of which would make it possible to ensure uniform discharge of the material from the receiving hopper and its stable density at the outlet of the hopper with a controllable output.
The main object is accomplished by that in an apparatus for metering bulk materials, comprising a vertically extending receiving hopper having a guide funnel in the bottom part thereof and a disc with at least one discharge opening mounted therebetween for rotation about vertical axis, according to the invention, a cut-off member is provided immediately above the discharge opening of the disc, which is mounted for vertical and horizontal movement and has its surface extending in parallel with the disc surface.
The cut-off member preferably comprises a plate secured to an arm which is movably connected to the disc.
Another embodiment of the invention provides that the apparatus can have an auxiliary disc and an auxiliary cut-off member which are mounted above the main disc and coaxially therewith, the cut-off member completely covering the discharge opening of the auxiliary disc.
The auxiliary disc is preferably movably mounted on a shaft. This construction of the apparatus makes it possible to ensure uniform escape of a material with a constant density and pre-set intensity of flow.
The invention essentially resides in that a cut-off member in the form of a plate extending in parallel with the disc surface ensures, during its combined rotation with the disc, continuous separation from the mass of a bulk material available in the hopper and remaining static of a layer of a constant thickness which is equal to the distance from the cut-off member surface to the surface of the disc, this layer moving uniformly under gravity only through the discharge opening and into the guide funnel. Any power action upon the material on the part of the cut-off member is thus eliminated thereby precluding volumetric deformation of the material and ensuing fluctuations of density.
Mounting the cut-off member on an arm which is movably connec
REFERENCES:
patent: 746410 (1903-12-01), Turner
patent: 895489 (1908-08-01), Morse
patent: 2189018 (1940-02-01), Robinson
patent: 2546300 (1951-03-01), Fritts
patent: 2767884 (1956-10-01), Grass
patent: 3193155 (1965-07-01), Hazen
patent: 3512680 (1970-05-01), Krolopp
S. P. Orlov, Dozirujuschie Ustroistva, 1960, Mashgiz, p. 110, FIG. 69.
Dyakov Gennady N.
Kramadzhian Arestakes A.
Lev Genrikh K.
Schipkov Ruslan B.
Shanin Vladimir K.
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