Device for accurately controlled feeding of a fine-grained, free-running particulate material
AssigneeSwiss Aluminium Ltd.
InventorsJosef Zengaffinen, Erwin Arnold
Life of this patent
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Abstract
A device for accurately controlled feeding of a fine-grained, free-running particulate material from a silo into a reactor vessel, in particular alumina from a day's supply silo to a break in the crust on an aluminium fused salt electrolytic cell, comprises essentially a vertical feed pipe which is situated below the silo and features upper and a lower closing flaps both of which are in the form of segments of a cylinder. The feed pipe mounted on the funnel shaped lower part of the silo features an outlet funnel which joins up with an outlet pipe.
Claims15
Device for accurately controlled feeding of a fine-grained, free-running particulate material from a silo which comprises:
- a silo outlet;
- a vertical feed pipe which is secured to the silo outlet including outlet means communicating with said silo projecting into said vertical feed pipe and having lower edges thereof, wherein said vertical feed pipe includes a lower outlet funnel beneath said outlet means which joins up with a lower outlet pipe having lower edges thereof;
- one upper and one lower cyliner-segment shaped flap means each having edges thereof movable from the horizontal into the vertical position and from the vertical into the horizontal position, said upper flap means being operatively associated with said outlet means, and said lower flap means being operatively associated with said lower outlet pipe, wherein when said flap means are in the horizontal position they are in close, non-contacting relationship with respect to said associated lower edges of said outlet means and said lower outlet funnel and are operative to block their respective associated outlets and the edges of the flap means are spaced from and projected beyond and above said associated lower edges, and when in the vertical position to free their respective outlets;
- and means outside said feed pipe for controlling the movement of said flap means, wherein the lower edges of said outlet means define a horizontal plane and while the upper flap is in the horizontal position the edges of the upper flap lie at the level or above the level of the horizontal plane.
Device for accurately controlled feeding of a fine-grained, free-running particulate material from a silo which comprises:
- a silo outlet;
- a vertical feed pipe which is secured to the silo outlet including outlet means communicating with said silo projecting into said vertical feed pipe and having lower edges thereof, wherein said vertical feed pipe includes a lower outlet funnel beneath said outlet means which joins up with a lower outlet pipe having lower edges thereof;
- one upper and one lower cylinder-segment shaped flap means each having edges thereof movable around horizontal axles from the horizontal into the vertical position and from the vertical into the horizontal position, said upper flap means being operatively associated with said outlet means, and said lower flap means being operatively associated with said lower outlet pipe, with the upper horizontal axle engaging said outlet means and the lower horizontal axle engaging said lower outlet pipe, wherein when said flap means are in the horizontal position they are in close, non-contacting relationship with respect to said associated lower edges of said outlet means and said lower outlet funnel and are operative to block their respective associated outlets and the edges of the flap means are spaced from and project beyond and above said associated lower edges and when in the vertical position to free their respective outlets;
- and means outside said feed pipe for controlling the movement of said flap means, wherein the lengths of the outlet means and lower outlet pipe are greater than their diameters, and the horizontal axles are situated at a level below the midpoints thereof.
Dependencies are inferred from the claim text.