Patent US3706387A successfully refreshed from Google Patents.
US3706387A
Expired / Lapsed
US
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Blast furnace charging apparatus for high top pressure
Assignee: John Mohr and Sons
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Filing: 1972-01-17
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Granted: 1972-12-19
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Expires: 1992-01-17
Abstract
Abstract An improved blast furnace charging apparatus for blast furnaces operating with the high top pressure, the apparatus including a revolving multi-chamber distributor hopper with swing valves to define a gas seal below the distributor hopper and material gates to prevent discharge of material on to the swing valves; the revolving mechanism being removed from any pressurized chamber of the charging apparatus.
Inventors
- 👤 Leo T Tokarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:58
CPC Classifications
C; C21; C21B; C21B7/00; C21B7/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
210 words
An improved blast furnace charging apparatus for blast furnaces operated with high top pressure and having a rotating multi-compartment distributor hopper associated therewith, said apparatus comprising: at least one charging chamber adapted to temporarily hold materials prior to charging said materials to the blast furnace, said charging chamber having top openings to receive materials; valve means associated with said chamber to seal the top openings and prevent the escape of gases from said chamber during one period of operation of the charging apparatus, said valve means being open during another period of operation of the charging apparatus to permit passage of materials through said openings; and said distributor hopper being mounted above said chamber, said hopper having a plurality of hopper chambers, said hopper chambers each having at least one opening registerable with said top opening sealed by said valve means when the hopper is in a predetermined position, said hopper chambers each having a materials holding gate disposed over said openings, respectively, to prevent unintentional passage of materials through the hopper chamber opening, said valve means being opened prior to opening of the materials holding gate so that the materials do not rest upon or move against the plate during operation of the apparatus thereby protecting the valve Means.
Claim 2
Dependent Claim
210 words
An improved blast furnace charging apparatus for blast furnaces operated with high top pressure and having a rotating multi-compartment distributor hopper associated therewith, said apparatus comprising: at least one charging chamber adapted to temporarily hold materials prior to charging said materials to the blast furnace, said charging chamber having top openings to receive materials; valve means associated with said chamber to seal the top openings and prevent the escape of gases from said chamber during one period of operation of the charging apparatus, said valve means being open during another period of operation of the charging apparatus to permit passage of materials through said openings; and said distributor hopper being mounted above said chamber, said hopper having a plurality of hopper chambers, said hopper chambers each having at least one opening registerable with said top opening sealed by said valve means when the hopper is in a predetermined position, said hopper chambers each having a materials holding gate disposed over said openings, respectively, to prevent unintentional passage of materials through the hopper chamber opening, said valve means being opened prior to opening of the materials holding gate so that the materials do not rest upon or move against the plate during operation of the apparatus thereby protecting the valve Means.
Claim 3
Dependent Claim
62 words
The blast furnace charging apparatus of claim 1 wherein the valve of the valve means, when open, moves into a recess in said one charging chamber out of the path of movement of materials from the distributor hopper to the charging chamber to prevent abrasive wear of said valve by movement of materials thereover and less degrading of burden materials by impact.
Claim 4
Dependent Claim
56 words
The blast furnace charging apparatus of claim 1 wherein the valve means is adapted to seat against a depending flange associated with the apparatus, said flange being disposed downwardly and away from the path of movement of materials through the top opening of charging chamber to protect it from abrasive wear during use of the apparatus.
Claim 5
Dependent Claim
55 words
The blast furnace charging apparatus of claim 1 wherein the distributor hopper is rotatable through a predetermined angle in either direction to position any desired hopper chamber and associated opening over one of the top openings of the charging chamber of the apparatus to provide means for uniform distribution of materials within the charging chamber.
Claim 6
Dependent Claim
92 words
The blast furnace charging apparatus of claim 1 wherein the holding gates are defined by pivotable cup-like elements adapted to prevent passage of materials from the hopper chambers in the closed position and to permit discharge of materials when they are pivoted to an open position, said cup-like members of the holding gate further adapted to move said materials inwardly of the materials passage to avoid unnecessary abrasive contact of the materials with any portion of the valve means during passage of said materials from the distributor hopper to said charging chamber.
Claim 7
Dependent Claim
46 words
The blast furnace charging apparatus of claim 1 wherein the multi-compartment distribution hopper is capable of receiving materials from a conveyor or other means and at the same time discharging materials from another compartment into the smaller bell chamber, thereby decreasing the load distributing cycle time.
References Cited (Backward Citations)
US3482714A
Cited
US3476374A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |