US3331598A - Cupolas - Google Patents
Cupolas Download PDFInfo
- Publication number
- US3331598A US3331598A US400673A US40067364A US3331598A US 3331598 A US3331598 A US 3331598A US 400673 A US400673 A US 400673A US 40067364 A US40067364 A US 40067364A US 3331598 A US3331598 A US 3331598A
- Authority
- US
- United States
- Prior art keywords
- cupola
- cover
- charge
- opening
- charging opening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
Definitions
- the cupola is provided with an offset stack and a vertically movable, plug-like concentric cover in the cupola body which can be lowered from the position above the charging opening to a position below said opening and immediately above the charge to prevent the entry of air into said cupola body, said cover descending with the level of the charge during melting to prevent a dangerous gas accumulation therebetween.
- This invention relates to improvements in cupolas, and more particularly to a cupola having a novel, verticallymovable cover which can be lowered with the level of the charge when desired.
- a charging opening is provided in the upper portion through which the charge of coke, limestone, scrap metal, etc. is deposited into said cupola.
- the entry of a large volume of air into the cupola, and the mixture thereof with the gases created in said cupola greatly increases the volume of gas which must be constantly drawn out of said cupola during operation, thereby substantially increasing the size and initial cost of the gas take-01f pump and related equipment, as well as increasing the operating cost of the cupola.
- the principal object of the present invention is to provide a novel closure for a cupola which can be utilized to prevent outside air from freely entering said cupola through the charging opening, and which cover device is adapted to automatically descend to a predetermined point with the level of the charge during melt down, or when the charge level has been allowed to get too low, thereby eliminating the possibility of a dangerous gas accumulation above said charge.
- FIG. 1 is a perspective view of a cupola having the improved cover device thereon, and showing a fragmentary portion of the adjacent framework;
- FIG. 2 is a fragmentary side elevational and vertical sectional view of the cupola showing the novel cover device in its raised position in full lines, and said vertically-movable cover being shown in broken lines in its lowermost position.
- the numeral 9 designates a cupola of the type herein concerned, and shown adjacent said cupola is a portion of the scaffolding and framework 27 which is designed to support the charging bucket rails 26 and bucket-conveying mechanism (not shown) in the illustrated cupola unit, as Well as the other equipment necessary in a complete, automated foundry complex. It is to be understood, of course, that the particular design of the cupola charging mechanism, and other incidental and related foundry equipment, is in no way critical to the cover device characterizing the present invention, and the invention is not to be limited to use in a complete unit such as that shown.
- the illustrated cupola 9 is generally cylindrical in form and includes a melting zone 11, there being the customary blast ring and tuyeres 25, etc., as is well known in the art, and mounted thereabove is an annular gas take-off ring 12.
- the latter is connected to a vacuum pump and emission cleaning mechanism (not shown), and during the melting operation said apparatus performs the important function of continuously exhausting gases from the cupola interior, said gases being cleaned and vented to the atmosphere or recuperated for use in the tuyeres.
- the upper portion 10 of the illustrated cupola is tapered downwardly, although a straight, cylindrical 'design will ordinarily be employed, and the charging opening 13 is formed thereabove. Projecting upwardly from said cupola, and offset therefrom is the stack 14, the offset design of said stack being an important feature of the invention, as will be hereinafter seen.
- a charging bucket (not shown) is filled at a lower, loading station with a charge of coke, scrap metal, limestone, and whatever other additives or inoculants are required for the desired end product, and said bucket is conveyed upwardly on the rails 26 by a suitable, power-driven hoist.
- said charging bucket reaches the upper end of said rails it is conveyed through the cupola opening 13, and is opened either automatically or by remote control to discharge its contents into the cupola, said bucket then returning to the loading hopper.
- the upper portion of the present cupola is provided with a horizontal platform 15 adjacent the offset stack 14, and mounted thereon is a bracket 16 supporting a vertical sleeve member 17 which is in alignment with the internal center line of the cupola proper.
- Projecting through, and slidably journaled in said sleeve 17 is an elongated vertical rod 18, said rod being of a length to extend downwardly from said sleeve to a point within the cupola adjacent the gas exhaust outlet 12, and carried on the lower end of said rod is a circular cover 19.
- Said cover is preferably elliptical in vertical cross section, and is of a diameter slightly smaller than the diameter of the upper portion of said cupola, as illustrated in broken lines in FIG. 2. 7
- a sheave 20 secured to the upper end of said vertically-movable cover-supporting rod 18 is a sheave 20, and trained thereabout is a cable 21.
- one end of said cable is deadended to the framework, as at 22, and after passing around a stationary sheave 23, the opposite end of said cable is secured to a power-driven drum or winch 24, thus providing mechanical means for raising said rod 18.
- Said cover is movable from the raised position shown in full lines in FIG. 2, wherein it is spaced above the charging opening 13, to the lowered position wherein it is located adjacent the cupola gas take-oil ring 12, as illustrated in broken lines.
- said cover-elevating mechanism incidentally, it is contemplated that numerous other equivalent devices could also be used, and the invention is not to limited in this respect.
- the cover-supporting rod 18 is initially raised to the full line position shown in FIGS. 1 and 2, by means of the cable and winch mechanism 21-24 or other equivalent device, thus positioning the cover 19 above the cupola charging opening 13.
- a sufiicient number of charges are then deposited in the cupola to fill the same to a point just below said charging opening, which line is designated by the letter A in FIG. 2.
- anew charge is added, thus again bringing the level to the approximate point A.
- the problem of air entering the cupola interior is not critical because said charge functions as a plug, to minimize the volume of air that can enter the cupola through the charging opening.
- the charge level is allowed to descend substantially more than one charge, however, as during the melt down or as occasionally happens through negligence or inadvertence on the part of the operator, the effectiveness of the relatively porous charge as a closure is diminished and the outside air flows into the cupola interior, with the undesirable results hereinabove described. It is in these instances that the novel cover device 19 is intended to be utilized.
- the cable 21 is automatically or mechanically released, and the rod 18 descends by gravity to a point where the cover 19 on the lower end thereof rests on the surface of said charge, thus preventing the free passage of air into the cupola through the charging opening.
- the novel cover device 19 is adapted to ride downwardly on top of the charge by gravity. The result is that said cover not only substantially closes off the top of the cupola to prevent the free flow of air therein, as described, but by descending with the levelof the charge during the melting operation there is no space between said cover and the charge in which gas can accumulate, as in prior cupola cover assemblies, and which can be extremely dangerous.
- the present invention provides a novel cover device for cupolas which can be utilized to minimize the flow of air through the charging opening and into the cupola, thus substantially reducing the size and capacity of the required gas take-off equipment and providing a complete unit which is not only less expensive in design, but which is considerably less costly to operate than prior units of the same general type.
- the vertically-movable nature of said cover assembly eliminates the possibility of an explosive gas build-up within the cupola.
- a cupola having a gas take-off opening and having a charging opening spaced thereabove
- the improvement comprising: an upwardly-projecting stack communicating with and ofiset from the top of said cupola; an elongated rod vertically-movably carried in the upper portion of said cupola, said rod being of a length to extend downwardly from the cupola top to a point within said cupola wherein its lower end is adjacent said gas take-off opening; means for raising said rod from a lowered position to an elevated position wherein its lower end is spaced above said charging opening; and a circular cover member of a lesser diame-ter than the cupola mounted on the lower end of said rod, said cover being movable with said rod from a raised position above the charging opening to a lowered position adjacent'the surface of .a charge contained in upper cupola portion between said charging opening and said gas take-ofi opening; a horizontal platform formed on said cupola above said charging opening, said platform having an opening therethrough; a vertical sle
- a cupola having a gas take ofi opening and having a charging opening spaced thereabove
- the improvement comprising: an upwardly-projecting stack communicating with and otfset from the top of said cupola; a cover member of a lesser diameter than the cupola mounted within said cupola and movable from a raised position above the charging opening to a lower position adjacent the surface level of a charge contained in said cupola and adjacent said gas ta-ke 01f opening; and means for raising and lowering said cover member.
Description
Claims (1)
- 3. IN A CUPOLA HAVING A GAS TAKE OFF OPENING AND HAVING A CHARGING OPENING SPACED THEREABOVE, THE IMPROVEMENT COMPRISING: AN UPWARDLY-PROJECTING STACK COMMUNICATING WITH AND OFFSET FROM THE TOP OF SAID CUPOLA; A COVER MEMBER OF A LESSER DIAMETER THAN THE CUPOLA MOUNTED WITHIN SAID CUPOLA AND MOVABLE FROM A RAISED POSITION ABOVE THE CHARGING OPENING TO A LOWER POSITION ADJACENT THE SURFACE LEVEL OF A CHARGE CONTAINED IN SAID CUPOLA AND ADJACENT SAID GAS TAKE OFF OPENING; AND MEANS FOR RAISING AND LOWERING SAID COVER MEMBER.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US400673A US3331598A (en) | 1964-10-01 | 1964-10-01 | Cupolas |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US400673A US3331598A (en) | 1964-10-01 | 1964-10-01 | Cupolas |
Publications (1)
Publication Number | Publication Date |
---|---|
US3331598A true US3331598A (en) | 1967-07-18 |
Family
ID=23584543
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US400673A Expired - Lifetime US3331598A (en) | 1964-10-01 | 1964-10-01 | Cupolas |
Country Status (1)
Country | Link |
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US (1) | US3331598A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3482827A (en) * | 1966-12-07 | 1969-12-09 | United States Steel Corp | Exhaust hood for oxygen steelmaking converter |
US3970809A (en) * | 1975-02-10 | 1976-07-20 | General Electric Company | Electric circuit breaker comprising parallel-connected vacuum interrupters |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1872057A (en) * | 1930-02-24 | 1932-08-16 | Gen Motors Res Corp | Cupola furnace |
US2561347A (en) * | 1948-08-20 | 1951-07-24 | Theodore G Kennard | Charging top for cupola furnaces |
-
1964
- 1964-10-01 US US400673A patent/US3331598A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1872057A (en) * | 1930-02-24 | 1932-08-16 | Gen Motors Res Corp | Cupola furnace |
US2561347A (en) * | 1948-08-20 | 1951-07-24 | Theodore G Kennard | Charging top for cupola furnaces |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3482827A (en) * | 1966-12-07 | 1969-12-09 | United States Steel Corp | Exhaust hood for oxygen steelmaking converter |
US3970809A (en) * | 1975-02-10 | 1976-07-20 | General Electric Company | Electric circuit breaker comprising parallel-connected vacuum interrupters |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ALCO INDUSTRIES, INC. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MODERN EQUIPMENT COMPANY, A CORP OF WI;REEL/FRAME:004289/0354 Effective date: 19840217 Owner name: AII, INC., A CORP OF WI Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ALCO INDUSTRIES, INC., A CORP OF WI;REEL/FRAME:004289/0357 Effective date: 19840217 Owner name: MODERN EQUIPMENT COMPANY, INC. Free format text: CHANGE OF NAME;ASSIGNOR:AII, INC.;REEL/FRAME:004289/0360 Effective date: 19840515 Owner name: ALCO INDUSTRIES, INC. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MODERN EQUIPMENT COMPANY, A CORP OF WI;REEL/FRAME:004289/0354 Effective date: 19840217 Owner name: AII, INC. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ALCO INDUSTRIES, INC., A CORP OF WI;REEL/FRAME:004289/0357 Effective date: 19840217 |