Claims
- 1. A circular base member for a fine material container having a floor provided with a generally centrally located outlet through which such material may be discharged, said base member comprising a bottom having a plurality of circumferentially spaced feed channels therein extending radially inwardly from the periphery of said base member and inclined downwardly toward and in communication with said outlet, the spaces between adjacent channels forming sector-like sections, and a cover interposed between each of said sections and overlying the associated channel, each of said covers being porous for the passage therethrough of aerating gas, each of said covers being inclined downwardly and radially outwardly toward the periphery of said base member, and each of said covers having therein at least one material discharge aperture adjacent the periphery of said base and in communication with the associated feed channel.
- 2. A base according to claim 1 wherein each of said sector-like sections has two upwardly converging surfaces which meet and form a ridge extending toward the centre of said base.
- 3. A base according to claim 2 wherein at least one of said surfaces is porous for the passage of aerating gas from below.
- 4. A base according to claim 2 wherein the converging surfaces of each of said sector-like sections are inclined at different angles to the horizontal.
- 5. A base according to claim 4 wherein the surface having the lesser inclination to the horizontal is porous.
- 6. A base according to claim 1 wherein each of said covers has more than one discharge aperture therein, each of which is located adjacent the periphery of said base.
- 7. A base according to claim 1 including a generally conical discharge cap overlying said material outlet and wherein each of said covers extends from the periphery of said cap toward the periphery of said base.
- 8. A base according to claim 1 wherein said central material outlet comprises at least one opening.
- 9. A base according to claim 1 wherein said central material outlet comprises a plurality of openings.
- 10. A base according to claim 9 wherein said openings are arranged substantially symmetrically about the centre of said base.
- 11. A base according to claim 1 wherein each of said channels has a porous bottom.
- 12. A base according to claim 1 wherein each of said channels has upwardly extending sides having upwardly and outwardly diverging upper surfaces, and wherein the cover for each of said channels is located substantially at the zone of transition between said sides and said upwardly converging surfaces.
Priority Claims (1)
| Number |
Date |
Country |
Kind |
| 7523514[U] |
Jul 1975 |
DT |
|
Parent Case Info
Container bases of the kind to which the invention relates frequently are used in mixing and discharge silos, especially silos adapted for the storage and intimate mixing of powdery material.
With known silo constructions it has frequently been found in practice, especially with the larger diameter containers and container bases, that difficulties arise with respect to uniform sinking of the column of material during discharge, i.e., in general the central zone of the column sinks more rapidly than the outer zone, so that (as seen in the silo cross-section) a species of cone or funnel is produced over the central discharge apertures, and hence the material in the zone above the outer periphery of the container base flows scarcely or not at all thus preventing uniform discharge.
The invention thus has for its objective the provision of a container base which permits the column of material resting above the base to sink uniformly over the entire cross-section.
According to the invention this objective is attained by means of a porous cover provided above each pneumatic feed channel and inclined downwardly towards the outer periphery of the container base. In this manner the material disposed above the container base may be aerated and is forced to move in a direction towards the outer periphery of the container base or a wall of the silo, in which zone it can then enter the pneumatic feed channel. This construction in accordance with the invention therefore from the start prevents the central zone of the column of material reaching the central outlet aperture first. The porous of the covers and their inclination ensure however that during the discharge operation not only the peripheral zone of the column of material but also the central zone of the column is removed into the pneumatic feed channels and thence to the outlet aperture, so that in every case the column of material can sink extremely uniformly over the entire cross-section.
Depending on the size and design of the container base and of the corresponding container or silo, each cover has only one material aperture provided near the outer periphery of the container base for discharge into the pneumatic feed channel, or (in particular for the larger diameter containers) each cover can be provided with at least two material apertures for discharging material into the corresponding pneumatic feed channel in the vicinity of the outer periphery of the container base.
US Referenced Citations (5)
Patent Grant
4082205
