US3502314A - Tiltable crucible or converter for refining pig iron - Google Patents

Tiltable crucible or converter for refining pig iron Download PDF

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Publication number
US3502314A
US3502314A US686993A US3502314DA US3502314A US 3502314 A US3502314 A US 3502314A US 686993 A US686993 A US 686993A US 3502314D A US3502314D A US 3502314DA US 3502314 A US3502314 A US 3502314A
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US
United States
Prior art keywords
crucible
converter
ring
wedges
bearing surfaces
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Expired - Lifetime
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US686993A
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English (en)
Inventor
Othmar Puhringer
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Voestalpine AG
Voest AG
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Voestalpine AG
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Publication date
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4633—Supporting means

Definitions

  • the supporting means taking up the bearing stresses were usually designed as pairs of brackets spaced around the periphery of the crucible shell and engagng the carrying ring by means of a projecting fiange.
  • the bearing surfaces In the upright position of the crucible, the bearing surfaces define a horizontal plane.
  • thermal expansion causes a clearance at the unstressed bearing surfaces, because the crucible 'with the brackets mounted thereon expands more than the carrying ring.
  • This causes heavy impact shocks when the crucible is tilted, as the crucible rocks to and fro between upper and lower brackets.
  • the Shock stress resulting from the expansion clearance is extremely detrimental to the whole Construction, especially for the bearings, and it reaches inadmissibly high values with large converters having an output capacity of to 300 metric tons.
  • a further object of the invention resides in that a secure suspension and support of the crucible has to be guaranteed even in the horizontal tilted position. With known constructions it has often happened that shock stresses have resulted from a side clearance developing between the supporting lugs and a stop on the carrying ring.
  • the construction of the invention which solves these problems, is characterised according to its main feature in that the inclination of the bearing surfaces is smaller than the ratio H /D, preferably H /2D, wheren H stands for the aXial distance between upper and lower bearing surfaces and D stands for twice the radial distance of the bearing surfaces from the longitudinal axis of the crucible.
  • H stands for the aXial distance between upper and lower bearing surfaces
  • D stands for twice the radial distance of the bearing surfaces from the longitudinal axis of the crucible.
  • the inclination of the bearing surfaces thus corresponds to an angle of oc/4.
  • These inclined bearing surfaces are provided on the upper as well as on the lower supporting means.
  • the inclined bearing surfaces are suitably provided on supporting means arranged in pairs, so-called pairs of brackets, of which two pairs of brackets, the supporting bracket pairs, are arranged diametrically opposite substantially in the trunnion axis, and a further pair of a brackets, the tilting bracket pair, is substantially perpendicular to the trunnion axis.
  • the inclined bearing surfaces may also be spaeed around a ring-shaped supporting construction surrounding the crucible shell and being fixed thereto, said supporting construction comprising an upper belt, a lower belt, and ribs mounted between these belts, and having disconnecting recesses, if desired.
  • the inclined bearing surfaces are detachable and adjustable. They may be provided on a pair of wedges, one of said wedges being rigidly welded to the projecting flange of a supporting element or releasably connected therewith by means of a shearing bolt, and the other of said wedges being releasably and adjustably connected with a guide means of the carrying ring.
  • the guide means of the carrying ring comprises a lateral guidance and a radial guidance, the lateral guidance being formed by rails mounted on the carrying ring by means of screws, and the radial guidance comprising a centering shoe which abuts on the carrying ring and has a fixing screw which reaches into the wedge and penetrates fitting plates.
  • a special characteristic of the invention which secures the horizontal tilt position of the crucible, resides in the inclined bearing surfaces of each supporting bracket being designed as two pairs of wedges arranged symmetrical of the trunnion aXis, a stopping block being provided between them in a conical recess on the carrying ring, said stopping block being adapted to be centered in relation to the walls of the conical recess of the carrying ring by means of side wedges with fitting plates and fixing screws.
  • the construction according to the invention combines the advantages of the known constructions without having their disadvantages.
  • the danger of jammings is excluded, while the clearance resulting from the thermal.
  • the weight of the charged crucible or converter is carried by the main supporting brackets in the range of the trunnions, when the crucible is in the erect position.
  • the stress caused by the tilting moment during turning of the crucible is accommodated by the tilting bracket.
  • the theoretical calculation for the bearing of the crucible may thus be based on a three-point support, each of the three points being, for constructional reasons, spread over two adjacent bearing surfaces, which has an advantageous eflect upon the theoretically calculated stresses.
  • FIG. 1 shows a crucible with carrying ring and supporting means in elevation and partly in cross-section.
  • FIG. 2 shows the ground-plan of FIG. 1.
  • FIG. 3 shows a vertical cross-section through a supporting bracket along the line III- III of FIG. 2 on an enlarged scale,
  • FIG. 4 a cross-section along the line lV-IV of FIG. 3
  • FIG. 5 is the ground-plan of FIG. 4 along the sectional line V-V of FIG. 4.
  • FIG. 6 shows a cross-section along the line VI-VI of FIG. 1 and demonstrates the mounting of the adjusting wedges for the stopping blocks for accommodating the crucible weight in the horizontal position of the crucible.
  • FIGS. 7 and 8 show elevation and groundplan of a modified embodiment.
  • Numeral 1 in the drawings denotes the crucible, having a refractory lining 2.
  • a carrying ring 10 surrounds the shell of the crucible; it may consst of several parts, as shown in FIG. 2.
  • the crucible 1 is Suspended in the carrying ring by means of pairs of brackets, pairs of brackets 4, 4', and 3, 3' being arranged substantially in the trunnion axis and acting as supporting brackets, while the pair of tilting brackets 5, 5' is arranged perpendicular thereto.
  • These three pairs of brackets are of identical design. For constructional reasons, they are designed as pairs of double-brackets.
  • a guide means 6 is arranged diametrically opposite of the pair of tilting brackets, and is designed in known manner for accommodating lateral stresses, but does not abut the carrying ring.
  • each bracket 3, 3', 4, 4', 5, 5' comprises an upper belt 3a welded to the crucible shell 1, a lower belt 3b welded to the crucible shell, and intermediate ribs 3c welded to the converter shell.
  • a wedge-shaped bearing plate 8 is detachably connected to the lower belt 3b by means of a shearing bolt 7, said plate resting upon a corresponding wedge-shaped counter piece 9 detachably connected to the carrying ring 10.
  • the bearing surfaces of the wedge plate 8 and the counter piece 9 are inclined towards the center of the ring, their inclination being defined by H/2D (FIG.
  • the detachable mounting of the counter piece 9 is effected by means of a centering shoe 11 having a nose 11a. Fitting plates 12 are inserted into the gap between nose 11a and counter piece 9. Fixing screws 13 penetrate through bores of the nose part 11a and of the fitting plates 12 into the counter piece 9 and hold it fast against the nose lla.
  • Rails 14 and 15 are mounted on the carrying ring 10 for lateral guidance of the wedge portion 9 on the carrying ring (FIG. 4), rail 15 being replaceable, so that wedge portion 9 may be laterally dismounted. Rail 15 is fixed to the carrying ring by screws 16.
  • the mounting support of the crucible for the horizontal tilt position is shown in FIGS. l and 6.
  • the crucible weight is carried by stopping blocks 17, arranged on the supporting brackets between two wedge portions 8 and lying in a recess of the carrying ring, which recess is formed by carrying ring noses 19.
  • the recess tapers radially outwardly, i.e. it is conical.
  • Side wedges 18 are laid against the walls of the carrying ring noses 19 on both sides of the stopping block 17, a slight play being adjusted between said wedges and the carrying ring noses 19.
  • Ftting plates 20, inserted between a bridge 21 fixed to the noses 19 and the wedges 18, are provided for adjusting wedges 18. The wedges are held against bridge 21 by means of screws 22.
  • a continuous supporting bracket ring is provided for reinforcing the whole vessel, said ring comprising an upper belt 23a, a lower belt 23b, and intermediate ribs 23c.
  • the belts and ribs are welded to the crucible shell, disconnecting recesses 23d being provided on the ring, which serve to prevent excessive stresses due to a temperature gradent in the annular belts. In those zones of the crucible shell, which, owing to the relieve apertures, are non-engaged, any excessive stresses which may occur can be reduced by allowing a local flow in the crucible shell.
  • the design of the inclined bearing surfaces as pairs of wedges and also the horizontal support construction are the same as described in connection With FIGS. 1 to 6.
  • said fixed and adjustable wedges having engagng bearing surfaces extending at an angle having an inclination substantially equal to the ratio of the axial distance separating the facing bearing surfaces on a pair of fixed wedges Secured, respectively, to an' upper and a lower bracket, divided by four times the radial distance of a fixed wedge from the longitudinal axis of said vessel.
  • each guide means comprising a pair of rails screwmounted on said ring for lateral guidance of an adjustable wedge, and a centering shoe supported on said ring and holding a fixing screw extending into said adjustable wedge, for radial guidance of said wedge.
  • said stopping block being inserted in a conical recess of said annular ring and adapted to be centered in relation to said conical recess by means of lateral keys bridged by a connecting member Secured to said keys by fixing screws having fitting plates thereon.
  • peripheral ring having upper and lower walls spaced radially from said vessel
  • each supporting construction comprising a first belt, a second belt extending adjacent to and substantially in parallel with said upper and lower walls of said ring, and a plurality of ribs connecting said belts;
  • each of said fixed wedges having an inclined bearing surface facing said peripheral ring;
  • said fixed and adjustable wedges having their engagng bearing surfaces extending at an angle having an inclnation substantially equal to the ratio of the distance separating the engagng bearing surfaces of a pair of axially aligned fixed wedges on respective ones of said second belts, divided by four times the radial distance of a fixed wedge from the longitudinal aXis of said vessel;
  • said adjustable wedges being mounted on said ring by means of lateral and radial guide members.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
US686993A 1967-01-17 1967-11-30 Tiltable crucible or converter for refining pig iron Expired - Lifetime US3502314A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT45267A AT276452B (de) 1967-01-17 1967-01-17 Kippbarer Tiegel oder Konverter zum Frischen von Roheisen

Publications (1)

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US3502314A true US3502314A (en) 1970-03-24

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US686993A Expired - Lifetime US3502314A (en) 1967-01-17 1967-11-30 Tiltable crucible or converter for refining pig iron

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US (1) US3502314A (de)
AT (1) AT276452B (de)
DE (2) DE1583315A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3561744A (en) * 1969-05-27 1971-02-09 Pennsylvania Engineering Corp Stabilized mounting for boflike vessels
US3684265A (en) * 1969-03-10 1972-08-15 Demag Ag Support arrangement for a vessel used in high temperature operations
US4061318A (en) * 1976-08-05 1977-12-06 Pennsylvania Engineering Corporation Metallurgical vessel
US4275871A (en) * 1980-07-18 1981-06-30 Pennsylvania Engineering Corporation Metallurgical vessel and supporting means
CN102392099A (zh) * 2011-11-14 2012-03-28 中冶建工集团有限公司 大型转炉托圈炉壳吊板连接调校对中装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3163696A (en) * 1961-05-09 1964-12-29 Stora Kopparbergs Bergslags Ab Arrangement for tiltable furnaces
US3372205A (en) * 1966-12-22 1968-03-05 Allied Chem Fluorinated allenes and process for preparing same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3163696A (en) * 1961-05-09 1964-12-29 Stora Kopparbergs Bergslags Ab Arrangement for tiltable furnaces
US3372205A (en) * 1966-12-22 1968-03-05 Allied Chem Fluorinated allenes and process for preparing same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3684265A (en) * 1969-03-10 1972-08-15 Demag Ag Support arrangement for a vessel used in high temperature operations
US3561744A (en) * 1969-05-27 1971-02-09 Pennsylvania Engineering Corp Stabilized mounting for boflike vessels
US4061318A (en) * 1976-08-05 1977-12-06 Pennsylvania Engineering Corporation Metallurgical vessel
US4275871A (en) * 1980-07-18 1981-06-30 Pennsylvania Engineering Corporation Metallurgical vessel and supporting means
CN102392099A (zh) * 2011-11-14 2012-03-28 中冶建工集团有限公司 大型转炉托圈炉壳吊板连接调校对中装置

Also Published As

Publication number Publication date
AT276452B (de) 1969-11-25
DE1583315A1 (de) 1970-08-06
DE6605749U (de) 1970-07-09

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