Measuring and testing – Volume or rate of flow – Tank type
Patent
1993-07-02
1995-03-07
Chilcot, Jr., Richard E.
Measuring and testing
Volume or rate of flow
Tank type
222 77, 222342, 222470, G01F 1115, G01F 1300
Patent
active
053947479
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The invention relates to metering apparatus for continuous gravimetric metering of pourable material passed through a charge tunnel to a rotor driven about a vertical rotational axis, and removed through a discharge region offset in a rotational direction to said charge tunnel, said rotor being supported pivotably about an essentially horizontal pivot axis and being connected to a force measuring device arranged at distance from said pivot axis.
BACKGROUND OF THE INVENTION
Commonly-owned DE 32 17 406 C2 (U.S. Pat. No. 4,528,848) discloses metering apparatus for continuous gravimetric metering of pourable material passed through a charge tunnel to a rotor driven about a vertical rotational axis, and removed through a discharge region offset in a rotational direction to said charge tunnel, said rotor being supported pivotably about an essentially horizontal pivot axis and being connected to a force measuring device arranged at distance from said pivot axis.
In this metering apparatus, the rotor comprises a plurality of receiving pockets which are discharged by supplying pressurized air. Such a metering apparatus is particularly adapted for coal dust metering in burning processes. However, the metering apparatus suggested there is of relative complex design due to the additional pneumatic feeding system for supplying pressurized air and in view of the elastic connecting elements necessary for the free pivotal movement of the rotor. Furthermore, there is a tendency for dome-forming in the pockets of the cellular rotor with pourable material having high humidity or with sticky pourable material, resulting under unfavourable conditions in an insufficient discharging of the pourable material.
SUMMARY OF THE INVENTION
Therefore, it is the object of the invention to provide a particularly simple and compact metering apparatus of the type defined, even adapted for badly flowing pourable material.
This object is solved according to the invention with a metering apparatus for continuous gravimetric metering of pourable material passed through a charge tunnel to a rotor driven about a vertical rotational axis, and removed through a discharge region offset in a rotational direction to said charge tunnel, said rotor being supported pivotably about an essentially horizontal pivot axis and being connected to a force measuring device arranged at distance from said pivot axis, characterized in that: said rotor is formed as a disk-type smooth-plane measuring disk and there is provided in said discharge region a stripping-off element extending over a radius of said measuring disk.
Since the rotor is formed as a disk-type, smooth-plane measuring disk, it is much simpler to be produced, for example by turning processing (e.g., with a lathe) such that the manufacturing costs are considerably lower as with the prior art where the cellular rotor is designed as a die-cast member or a complex welded element. By means of the removing element provided in the discharging region of the measuring disk and extending over half of the diameter of the measuring disk, a fast and continuous discharging of the pourable material is achieved without the necessity of complex pressure ducts. Even slightly sticky pourable material is completely stripped off from the measuring disk such that behind the discharging region no residual amounts of pourable material are left on the measuring disk which might result in measuring inaccuracies.
Preferred improvements of the metering apparatus according to the invention are characterized in the subclaims.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the metering apparatus of the invention will be explained in more detail hereinafter referring to the drawings. There are shown in:
FIG. 1 an elevational view of the metering apparatus of the invention; and
FIG. 2 a plan view of the metering apparatus of FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1 there is shown a metering apparatus 1 in an elevational view for metering pourable material 2 illu
REFERENCES:
patent: 3561643 (1921-02-01), Klover
patent: 4528848 (1985-07-01), Hafner
patent: 5125535 (1992-06-01), Ohlman
Chilcot Jr. Richard E.
Linden Gerald E.
Patel Harshad
Pfister GmbH
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