US3830623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooler tube for rotary kiln
Assignee: FLSmidth and Co AS
•
Filing: 1973-01-03
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Granted: 1974-08-20
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Expires: 1993-01-03
Abstract
Abstract An improved cooler tube structure for a rotary kiln is disclosed. In construction, the cooler tube includes combined means for lifting and conveying material exiting from the kiln through the cooler tube. This combined means is selectively positioned at a predetermined distance away from the material inlet opening into the cooler tube. The cooler tube further includes separate means for conveying material exiting from the kiln through the cooler tube substantially without lifting it. The separate means is advantageously positioned upstream of said combined lifting and conveying means in relation to the direction of material flow through the cooler tube.
Inventors
- 👤 S Christiansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:30
CPC Classifications
F; F27; F27B; F27B7/00; F27B7/20; F27B7/38; F27B7/40
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
165 words
In a rotary kiln having a plurality of cylindrical cooler tubes mounted in planetary fashion around the outlet end of the kiln with the axes of the cooler tubes extending substantially parallel to the axis of the kiln, each cooler tube having a material inlet end and a supply chute connecting the material inlet end with the material outlet end of the kiln, the improvement wherein each cooler tube comprises a first inlet section having a heat and wear resistant lining comprised of plate-like sections which form an uneven surface extending axially along a cylindrical portion of the tube, and a second section connected to said first section, said second section including combined material lifting and conveying means extending helically along the inner wall of the cooler tube toward the outlet end of the cooler tube from a position spaced axially from the material inlet end of the tube by a distance at least equal to approximately twice the internal diameter of the cooler tube.
Claim 2
Dependent Claim
165 words
In a rotary kiln having a plurality of cylindrical cooler tubes mounted in planetary fashion around the outlet end of the kiln with the axes of the cooler tubes extending substantially parallel to the axis of the kiln, each cooler tube having a material inlet end and a supply chute connecting the material inlet end with the material outlet end of the kiln, the improvement wherein each cooler tube comprises a first inlet section having a heat and wear resistant lining comprised of plate-like sections which form an uneven surface extending axially along a cylindrical portion of the tube, and a second section connected to said first section, said second section including combined material lifting and conveying means extending helically along the inner wall of the cooler tube toward the outlet end of the cooler tube from a position spaced axially from the material inlet end of the tube by a distance at least equal to approximately twice the internal diameter of the cooler tube.
Claim 3
Dependent Claim
54 words
The improved rotary kiln according to claim 1 wherein the distance between the upstream end of the combined lifting and conveying means in relation to the direction of material flow through the tube and the material inlet end of the tube is equal to at least five times the internal diameter of the tube.
Claim 4
Dependent Claim
26 words
The improved rotary kiln according to claim 1 wherein each cooler tube includes separate means for moving material through the cooler tube substantially without lifting it.
Claim 5
Dependent Claim
34 words
The improved rotary kiln according to claim 3 wherein the combined lifting and conveying means includes at least one through-shaped conveyor flight and wherein the separate means includes at least one screw threadlike trough.
Claim 6
Dependent Claim
33 words
The improved rotary kiln according to claim 4 wherein each of said troughs is positioned between the inlet end of the cooler tube and the section of the tube containing said conveyor flights.
Claim 7
Dependent Claim
35 words
The improved rotary kiln according to claim 4 wherein said troughs are positioned such that the conveyor flights are divided into two sections located on opposite sides of the tube section containing the conveyor flights.
Claim 8
Dependent Claim
47 words
The improved rotary kiln according to claim 4 wherein the trace of each of said troughs on the internal wall of the tube forms an angle with the generatrix of the tube which is greater than the angle of repose of the material in the cooler tube.
Claim 9
Dependent Claim
33 words
The improved rotary kiln according to claim 3 wherein said separate means is located upstream of said combined lifting and conveying means in relation to the direction of material flow through the tube.
Claim 10
Dependent Claim
44 words
The improved rotary kiln according to claim 3 wherein said separate means is located within the tube such that said combined lifting and conveying means is divided into two sections disposed on opposite sides of the section of the tube containing said separate means.
Claim 11
Dependent Claim
61 words
The improved rotary kiln according to claim 3 wherein said separate means includes at least one material conveying element mounted on the interior wall of the tube such that the trace of said element on said wall forms an angle with the generatrix of the tube which is greater than the angle of repose of the material flowing through the tube.
Claim 12
Dependent Claim
28 words
The improved rotary kiln according to claim 8 wherein one section of each tube has a heat and wear resistant lining comprising plate-like sections forming an uneven surface.
Claim 13
Dependent Claim
25 words
The improved rotary kiln according to claim 11 wherein said sepArate means is located between said combined lifting and conveying means and said one section.
Claim 14
Dependent Claim
22 words
The improved rotary kiln according to claim 12 wherein said one section is located adjacent the material inlet opening into the tube.
Claim 15
Dependent Claim
31 words
The improved rotary kiln according to claim 13 wherein said separate means, said combined means and said one section are located immediately adjacent each other along the length of the tube.
Claim 16
Dependent Claim
61 words
The improved rotary kiln according to claim 14 wherein said separate means includes at least one material conveying element mounted on the interior wall of the tube such that the trace of said element on said wall forms an angle with the generatrix of the tube which is greater than the angle of repose of the material flowing through the tube.
Claim 17
Dependent Claim
29 words
The improved rotary kiln according to claim 15 wherein said separate means, said combined means and said one section together extend over substantially the entire length of the tube.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |