US3796326A - Cupola furnace having a closure arrangement - Google Patents

Cupola furnace having a closure arrangement Download PDF

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Publication number
US3796326A
US3796326A US00213636A US3796326DA US3796326A US 3796326 A US3796326 A US 3796326A US 00213636 A US00213636 A US 00213636A US 3796326D A US3796326D A US 3796326DA US 3796326 A US3796326 A US 3796326A
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US
United States
Prior art keywords
charging
cupola
bucket
closure member
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
Application number
US00213636A
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English (en)
Inventor
E Buhrer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Georg Fischer AG
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Individual
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Filing date
Publication date
Priority claimed from CH1937970A external-priority patent/CH540981A/de
Priority claimed from CH1641971A external-priority patent/CH547860A/de
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3796326A publication Critical patent/US3796326A/en
Assigned to GEORG FISCHER AKTIENGESELLSCHAFT reassignment GEORG FISCHER AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BAUMANN, DORIS HEIRS OF ERWIN BUHRER, DEC'D., BRANDLI, GRETE, BUHRER, DORA BERTHA, ROTH, LOTTE
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/18—Bell-and-hopper arrangements
    • 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
    • F27B1/20—Arrangements of devices for charging
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S266/00—Metallurgical apparatus
    • Y10S266/90—Metal melting furnaces, e.g. cupola type

Definitions

  • ABSTRACT Apparatus for charging a cupola furnace through an upper opening whereby a charging bucket comprising a bottom closure member is placed upon the charging opening in sealing engagement with the rim thereof.
  • a cupola closure member is situated interiorly of the cupola furnace and operates to seal the charge opening from within the furnace. After the charging bucket is lowered into engagement with the rim of the upper opening, the cupola closing member is withdrawn from the charging opening in a direction interiorly of the furnace, and the bucket bottom closure is opened to effect charging.
  • the size of the charging throat of the cupola furnace is made larger than is customary, and the device is structured to enhance discharge of waste gases therefrom.
  • the present invention relates to a cupola furnace having an upper charging hole or opening located above the furnace throat and provided with a closure arrangement whereby a charging bucket can be placed on the rim or margin of the opening to effect charging of the cupola by activation of the closure arrangement.
  • the upper portion of the throat or top of the furnace is constructed in the manner of a container having a configuration similar to those found in blast furnaces.
  • an inclined elevator mechanism conveys a charge into the container by means of a tiltable bucket.
  • a bottom closure of this container can be opened whereupon the charge falls into the melting zone of the eupola furance.
  • This embodiment has the disadvantage that the material to be charged must be of relatively small particle size in order to prevent bridge formations during the charging.
  • This bridge formation which is to be avoided, is a consequence of the restricted crosssection through which the material to be charged must pass when it moves from the upper container space into the throat of the cupola furnace.
  • a cupola furnace wherein a charging bucket can be placed onto a top charging hole or opening in such a manner that the bucket closes the opening.
  • a closure device is arranged in this construction below the opening.
  • This closure device is built into the throat of the furnace and is a twopart mechanism constructed in the form of a slide. This closure mechanism is actuated after the bucket has been placed on the opening. After this two-part closure mechanism has been opened, the bottom closure of the charging bucket can be opened and thus the material to be charged is supplied to the cupola furnace. After the bottom closure of the bucket has been actuated, the two-part closure device built into the throat of the furnace can again be closed.
  • a cupola furnace which is fitted with a throat closure device of the kind indicated above, has moreover the disadvantage that the waste gases are withdrawn from the melting zone or column through an annular surface. This creates extremely high gas velocities so that the unpurified cupola waste gases contain a very high amount of dust. This disadvantage applies to most of the prior art cupola furnaces which are charged through the throat.
  • the cupola furnace of the present invention is characterized in that at least one throat closure member is movable from the interior of the cupola furnace to close the charging hole or opening and that the throat, which is situated above the melting column or zone of the cupola furnace, has a diameter which is en larged beyond customary dimensions.
  • the throat and the charging opening above the melting column of the eupola are enlarged to such an extent that enables very bulky portions of the metallic components of the charge to be easily fed without obstruction into the interior of the cupola.
  • the throat consists of a coneshaped filling space which becomes narrower towards the cupola and that this cone-shaped filling space merges into an approximately cylindrical upper shaft or chute whose cross-section is at the most equal to the cross-section of the lower shaft and that the discharge by suction of the waste gas emanating from the top of the furnace is arranged to occur in the annular space between the upper and lower shaft.
  • the passage of the cupola waste gases through the gas discharge can be effected with such a low velocity that the dust content of the gas is only a fraction of the dust content of waste gases discharged from prior art cupola furnaces wherein the gases exit through an annular opening at the level of the melting column.
  • the position of the charging opening relative to the throat of the furnace may, due to deformation, be displaced. It is also feasible that the holding arm of the closure body which bears against the opening from below will become warped after prolonged use. For this reason the invention provides a type of support which assures that the position of the closure member will adapt itself to the position of the opening so that even after prolonged use a satisfactorily sealing closure is assured.
  • FIG. I is a sectional elevation of a first embodiment of a cupola furnace in accordance with the invention showing a filled charging bucket placed in position preparatory for charging;
  • FIG. 2 is a sectional elevation of the cupola furnace of FIG. 1 showing the arrangement after the closure mechanism has been actuated for charging;
  • FIG. 3 is a sectional view showing in more detail the mechanism of FIGS. 1 and 2;
  • FIG. 4 is a sectional elevation showing a second embodiment of the invention.
  • FIG. 5 is a sectional view showing in more detail the embodiment of FIG. 4.
  • FIG. 6 is a sectional elevation showing a further embodiment of the invention.
  • FIGS. 1, 2 and 3 there is shown a cupola furnace comprising a charge or column ll located within an inner wall 2.
  • the level of charge in the melting column 1 is sensed in a known manner by a mechanism 3.
  • a new charge is supplied to the cupola.
  • the throat or top 4 of the cupola is formed by a conically shaped portion 5 which merges into a cylindrical portion 6.
  • the cupola furnace gases are withdrawn through the pipe 7 in the direction of the arrow 8.
  • a furnace throat closure 9 has an opening I0 (see also FIG. 3) onto which a charging bucket 11 can be placed.
  • a closure body 32 rests on a pendu- I lum or pin support 13 which receives the closure body 12 in a bore 14 and which is supported on the bottom 15 ofa bore 16.
  • the bore 16 is enlarged relative to the diameter of the pin support 13 by an amount conforming to the play which is required for proper functioning of the device.
  • the bore 17 in the closure body I2 is also larger in diameter than the diameter of the pin support holding means 18 in order to enable the necessary play therebetween.
  • a U-shaped support arm 20 which is guided in a mounting 21 so that it can be raised and lowered but not rotated, is counterbalanced through arope 28 and rollers or pulleys 29 secured at a support structure 30, with a counterweight 22 in order to enable the closure body 12 to be pressed with the required closing pressure against the opening 10 by applying and relieving the weight of counterweight 22 to the support arm 2%.
  • the counterweight 22 is lifted a distance 24 from a support 23.
  • An air cylinder 25 is connected during normal operation througha line 26 to a compressed air network and operates to lift the counterweight 22 the distance 24 from the support 23.
  • the compressed air cylinder 25 can be emptied through the valve 27 of the air line 26.
  • valve 27 of the air line 26 is again set in such a manner that compressed air is supplied to the cylinder 25.
  • a structural member 31 on the cover 9 carries a floating closure plate 32 which adapts itself to each position of the support arm 20.
  • a lifting roller 33 of a charging trolley hoist (not shown) carries a coupling piece 34 which in a known manner can establish an automatic connection with a headpiece 35.
  • the headpiece 35 is connected with a rod 36 whose lower end is connected with the bottom closure 37 of the charging bucket 11.
  • Two jibs or traverses 38 and 39 are rigidly connected with the coupling piece 34.
  • the jibs 38 and 39 support, through flexible support members 410 and 41, the upper closure or cover 42 of the bucket i 1.
  • the cover 42 lowers itself upon the charging bucket 11 and maintains a sealing engagement therewith when the coupling piece 34 is lowered or while it is in engagement with the headpiece 35 to maintain the bucket 11 suspended from the charging crane.
  • the closure 42 rests on the bucket 11 and the support members 49 and 41 are relieved. During this engagement, the bucket I1 may be placed on the rim of the opening 10 and will close the latter.
  • FIG. 3 shows that when the bucket 1 1 is placed in position, a safety distance 43 is formed between the bottom closure 37 and the closure body 12.
  • the coupling piece 34 by actuation of the charging crane, is lowered from the position in FIG. I into the position of FIG. 2, the closure body 12 and the parts l3, l5 l8 and 20, connected therewith, are also lowered in a vertical direction.
  • the bucket 11 will open upon lowering of the coupling piece 34 for emptying of the charge material contained therein. During this lowering procedure, the bucket 11 remains closed by the upper closure 42.
  • the material in the bucket falls over and around the cone of the bottom closure 37 and around the closure body 12 onto the melting column I in the cupola furnace.
  • the bottom closure 37 is lifted and at the same time the closure body 12 is pressed against the opening 10 by the counterweight 22.
  • the various parts of the closure mechanism are constituted such that the force with which the closure body 12 is pressed against the opening 10 by the counterweight 22 is half of the weight of the parts 35, 36 and 37.
  • FIGS. 4 and 5 show a further embodiment of the invention which differs from that of FIGS. 1 3 in that the round bucket 11 and the circular charging opening 10 are replaced by a charging bucket 50 and a charging opening 52 having a rectangular cross-section as viewed in a horizontal plane.
  • the closure lid or cover 52 is, as shown in FIGS. 4 and 5, a part of the charging crane.
  • a stirrup 53 is gripped in a usual manner by the charging crane and carries the bucket 50 through rods 54, rods 55 and a bottom closure 56.
  • the bucket 50 is placed down onto the rim of the opening 51 by means of a guide (not shown) while hanging from the charging crane.
  • the blocking mechanism is of conventional nature and is generally indicated by reference numeral 90. It may comprise a sensor 91 and a blocking control 92.
  • the closure bodies 60 and 61 are moved by means of the lifting cylinders 58 and 59 and by means of two levers 63 from the closed position A into the opened position 13.
  • the bottom closures 56 and 62 of the bucket 50 are opened from the closed position C into the opened position D, and the charge thus falls into the melting column.
  • the bottom flaps 56 and 62 are closed and release the actuation of the lifting cylinders 58 and 59 whereby the closure bodies 60 and 61 are moved into the position A.
  • FIG. 5 shows a closure body 61 in section according to FIG. 4.
  • This rectangular closure body 61 has one of two levers 63 which holds the closure body 61 in a nonrotatable position. This is accomplished by the inserts 64 and the pendulum or pin support 65.
  • the closure bodies 60 and 61 can be pressed against the opening in a similar manner as disclosed in connection with the closure body 12 in FIG. 3.
  • the throat 4 which is enlarged in accordance with the invention, aswell as the adjoining pipes 7, be insulated in order to avoid large heat losses.
  • FIG. 6 a melting column 71, a lower shaft 72 and an upper shaft 93 of the cupola furnace are shown.
  • a throat 74 of the furnace consists of a conical portion 75 which is adjacent the cylindrical upper shaft 73.
  • the throat closure consists of a closure body 76 which can be placed against the opening 77 from the interior of the cupola furnace.
  • the upper shaft 73 is surrounded by an annular space 78 from which the waste gas discharge device 79 discharges the formed gases in the direction of the arrow 80.
  • a connecting line 86 is arranged between the throat 74 and the gas suction device 79. Since the pressure in the upper portion of the gas suction device 79 is somewhat lower than the pressure in the throat 74, there is a constant flow or scavenging of the throat 74 with gas.
  • valve 84 opensThe amount of water which passes through the water line 87, the valve 84 and the connected nozzles 82 causes a cooling of the exiting gases down to a predetermined temperature and thus prevents damage which otherwise could occur due to too high gas temperatures.
  • a cupola furnace according to the present invention has the advantage that the dimensions of the throat and of the charging bucket can be chosen to be sufficiently large that the bulkiness of the material to be charged into the furnace can be selected taking into consideration merely the inner width of the cupola furnace but not that of the charging device.
  • the inventive closed cupola furnace thus described has the additional advantage that the amount of gas to be sucked off is lowered to a level of 50 65 percent as compared to prior art constructions.
  • the present invention insures that at no time, including charging, will cupola furnace gases exit to the atmosphere or leakage air be admixed with the waste gases. This is of particular importance if the dust removal from the cupola waste gases is to be effected by electrofilters.
  • a charging mechanism for a cupola furnace having an upper charging opening comprising: a charging bucket adapted to be placed in sealing engagement with said opening; a bottom closure member for said charging bucket; a cupola closure member extending from within said cupola to be placed in sealing engagement with said opening; means for moving said cupola closure member in a direction interiorly of said cupola out of sealing engagement with said opening; said means for moving said cupola closure member including a U-shaped support arm having a pair of ends, means enabling said support arm to movably-extend from the interior to the exterior of said furnace while maintaining said furnace in a sealed condition, support arm actuating means located exteriorly of said furnace and engaging said support arm at one of said ends, and means connecting said cupola closure member to the other end of said support arm whereby said cupola closure member may be moved into and out of sealing engagement with said opening by operation of said actuating means; and means for opening said charging bucket bottom closure member while said bucket remains in sealing engagement with said opening whereby said cupola may be charged
  • a charging mechanism comprising an overhead supporting mechanism which includes said bottom closure member, said supporting member being configured such that the weight of said bucket rests upon said closure member to maintain a sealing engagement therebetween when said bucket is supported from above through said supporting mechanism, a charging bucket upper closure member, crane means including means for engaging said charging bucket supporting mechanism to transport said charging bucket, and flexible means for suspending said upper closure member from said crane means to locate and maintain said upper closure member in sealing engagement with said bucket when said crane means engages said supporting shaped throat section located proximate and below said charge opening, a cylindrically shaped charge melting column located below said comically-shaped throat, and a cylindrically shaped section adjacent said conical throat having a diameter not larger than said melting column, with said melting column and said cylindrical section being vertically juxtaposed to define an annular space therebetween for permitting escape of waste gases therethrough.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
US00213636A 1970-12-31 1971-12-29 Cupola furnace having a closure arrangement Expired - Lifetime US3796326A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1937970A CH540981A (de) 1970-12-31 1970-12-31 Kupolofen mit Gichtverschluss
CH1641971A CH547860A (de) 1971-11-11 1971-11-11 Kupolofen mit gichtverschluss.

Publications (1)

Publication Number Publication Date
US3796326A true US3796326A (en) 1974-03-12

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ID=25717929

Family Applications (1)

Application Number Title Priority Date Filing Date
US00213636A Expired - Lifetime US3796326A (en) 1970-12-31 1971-12-29 Cupola furnace having a closure arrangement

Country Status (9)

Country Link
US (1) US3796326A (fr)
AT (1) AT317452B (fr)
BE (1) BE777538A (fr)
CA (1) CA964057A (fr)
DD (1) DD94875A5 (fr)
FR (1) FR2120007B1 (fr)
GB (1) GB1372590A (fr)
IT (1) IT944241B (fr)
SE (1) SE377181B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4691899A (en) * 1984-06-29 1987-09-08 Daido Tokushuko Kabushiki Kaisha Apparatus for reactor iron making
US6056914A (en) * 1998-03-11 2000-05-02 Van Dril; William A. Apparatus for charging a shaft-type cupola furnace
CN101709915B (zh) * 2009-12-25 2011-12-21 吕建强 冲天炉提斗式加料机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2693886A (en) * 1952-03-05 1954-11-09 Grindle Corp Apparatus for loading cupolas
US2721073A (en) * 1952-10-17 1955-10-18 Modern Equipment Co Sealed cupolas and charging apparatus therefor
US3653647A (en) * 1970-08-05 1972-04-04 Kinney Eng Inc S P Blast furnance top cone and steam control nozzle assembly

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE520164C (de) * 1929-09-15 1931-03-07 Georg Eichenberg Dr Ing Verfahren und Vorrichtung zur Verminderung der Staubverluste bei Schachtoefen
DE834427C (de) * 1950-09-09 1952-03-20 Strikfeldt & Co W Gichtverschluss fuer Schachtoefen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2693886A (en) * 1952-03-05 1954-11-09 Grindle Corp Apparatus for loading cupolas
US2721073A (en) * 1952-10-17 1955-10-18 Modern Equipment Co Sealed cupolas and charging apparatus therefor
US3653647A (en) * 1970-08-05 1972-04-04 Kinney Eng Inc S P Blast furnance top cone and steam control nozzle assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4691899A (en) * 1984-06-29 1987-09-08 Daido Tokushuko Kabushiki Kaisha Apparatus for reactor iron making
US6056914A (en) * 1998-03-11 2000-05-02 Van Dril; William A. Apparatus for charging a shaft-type cupola furnace
CN101709915B (zh) * 2009-12-25 2011-12-21 吕建强 冲天炉提斗式加料机

Also Published As

Publication number Publication date
GB1372590A (en) 1974-10-30
FR2120007A1 (fr) 1972-08-11
DD94875A5 (fr) 1973-01-05
DE2162057B2 (de) 1975-10-02
IT944241B (it) 1973-04-20
SE377181B (fr) 1975-06-23
FR2120007B1 (fr) 1974-08-23
CA964057A (en) 1975-03-11
DE2162057A1 (de) 1972-07-13
AT317452B (de) 1974-08-26
BE777538A (fr) 1972-04-17

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Date Code Title Description
AS Assignment

Owner name: GEORG FISCHER AKTIENGESELLSCHAFT, MUHLENTALSTRASSE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:BUHRER, DORA BERTHA;BRANDLI, GRETE;ROTH, LOTTE;AND OTHERS;REEL/FRAME:003843/0200

Effective date: 19801230