# US 4,398,828 A · Pneumatic mixing silo

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- Number: US 4,398,828 A
- Document ID: US4398828A
- Status: Granted
- Kind: A
- Application number: 06/213,498
- Filed: 1980-12-05
- Granted: 1983-08-16
- Earliest claimed: 1980-01-21
- Assignees: Krupp Polysius AG
- Inventors: Wolfgang Kluger; Heinz Huser
- Web page: https://patentgrep.com/patent/US4398828A

## CPC

- B01F 33/4092: {Storing receptacles provided with separate mixing chambers}
- B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06)

## Abstract

The invention relates to a pneumatic mixing silo comprising a storage compartment, a central mixing compartment connected thereto and at least one material inlet opening into the mixing compartment and at least one material outlet connected to the mixing compartment. A considerable improvement in the mixing effect of this mixing silo (1) may be obtained above all if the material outlet (14) is formed by an overflow from the mixing compartment (3). In addition, correcting material may be directly introduced into the mixing compartment through an additional material inlet (12).

## Claims

### Claim 1

A pneumatic mixing silo comprising an upright wall and a base forming a storage compartment for materials to be mixed; means for introducing materials to be mixed into said storage compartment adjacent its upper end; an annular wall spaced from and encircled by said upright wall and having a bottom at a level below that of said base, said annular wall and said bottom forming a mixing compartment; means for aerating said base and said bottom; a plurality of throughflow openings in said annular wall at the level of said base of said storage compartment and through which materials from said storage compartment may pass into said mixing compartment; at least one material overflow outlet in said mixing compartment at a level above that of said throughflow openings; and discharge conveyor means communicating with said overflow outlet for transporting material discharged therefrom from said silo.

### Claim 2 (depends on 1)

A silo according to claim 1 including means for introducing correcting material to said mixing compartment at a level above that of said outlet opening.

### Claim 3 (depends on 1)

A silo according to claim 1 wherein said overflow outlet opening is adjustable.

### Claim 4 (depends on 1)

A silo according to claim 1 wherein said annular wall extends the full height of said storage compartment and supports a cover for the silo.

### Claim 5 (depends on 4)

A silo according to claim 4 wherein said cover has an opening in communication with said mixing compartment for the introduction of correcting material directly into said mixing compartment.

### Claim 6 (depends on 1)

A silo according to claim 1 including an additional material outlet adjacent the bottom of said mixing compartment for removing residues therefrom.

### Claim 7 (depends on 1)

A silo according to claim 1 including a buffer container in communication with said conveyor means for receiving material from said mixing compartment.

### Claim 8 (depends on 7)

A silo according to claim 7 including an additional material outlet in the bottom of said mixing compartment for removing residues therefrom, and further conveyor means for transporting residues from said additional outlet to said buffer container.

### Claim 9 (depends on 1)

A silo according to claim 1 wherein said conveyor comprises a pneumatic trough.

### Claim 10 (depends on 8)

A silo according to claim 8 wherein said further conveyor means includes a vertical conveyor.

### Claim 11 (depends on 1)

A silo according to claim 1 wherein said aerating means is common to both of said compartments.