Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D1/00—Casings; Linings; Walls; Roofs
  • F27D1/18—Door frames; Doors, lids or removable covers
  • F27D1/1808—Removable covers
  • F27D1/1816—Removable covers specially adapted for arc furnaces
• • 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
  • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces
  • F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces heated electrically, with or without any other source of heat
  • F27B3/085—Arc furnaces
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D1/00—Casings; Linings; Walls; Roofs
  • F27D1/18—Door frames; Doors, lids or removable covers
  • F27D1/1808—Removable covers
  • F27D2001/1825—Means for moving the cover
  • F27D2001/185—Means for moving the cover comprising means for tilting the cover

Definitions

• the present invention relates to an electric arc furnace, comprising at least one furnace vessel, at least one furnace lid and at least one support arm system associated with the furnace cover, with which the furnace cover can be raised and lowered onto the furnace vessel via a rotating and / or lifting portal connected to the support arm system.
• arc furnaces From the state of the art arc furnaces, so-called. EAF ovens, with support arm systems for the furnace cover known in which water-cooled boom are provided, which hold the furnace cover in a 3-point suspension - in a V-arrangement. Furthermore, self-supporting Einarmige furnace cover systems are known, which is associated with its own Deckelhub- and slewing gear. Such generic arc furnaces are known, for example, from DE 1 940 740 and DE 3 522 559. Furthermore, DE 1 216 900 discloses a device for coupling the lift-off furnace lid to the electrode lifting device of an electric arc furnace.
• a piston side used, single-acting hydraulic cylinder which is hinged to the base of the rotary and / or lifting portal at a first receiving point, and with a rotary and / or lifting portal associated recording facial expressions at a second pick-up point, which is aligned in alignment with the first pick-up point, is rotatably mounted.
• the self-supporting Tragarmsystem the furnace cover is formed from spokes pairs crossing at right angles, wherein the pair of spokes, which is formed parallel to the transverse axis of the furnace vessel (bend plane) extended over the edge of the lid.
• the conventional support arms for a cover can be omitted in favor of a self-supporting furnace cover. This also leads to a considerable simplification in the cooling of the furnace lid and to simplify theisserstoffzu and - return lines.
• a shortening of the coolant connections through the rotary and / or lifting tower and below a tilting stage associated with the furnace is possible.
• the cover replacement time can be shortened considerably.
• the radial spokes have free ends, wherein the free ends are associated with pin joints.
• the furnace cover on the Tragarmsystem is liftable and / or hinged.
• the recording facial expressions can be lowered by the hydraulic cylinder to the extent that the pin joints are posted at the free ends of the Tragarmsystems from the storage cavities of the recording facial expressions and the furnace lid is mechanically and electrically decoupled from the rotary and / or lifting portal.
• the geometry between the hydraulic cylinder, and the receiving points for the Tragarmsystem is selected on the recording facial that horizontal displacements are generated when lifting the furnace cover, which negligible in the region of the openings of the electrodes through the furnace lid are formed in the interface plane of the opening of the furnace vessel so that adhesions of the furnace lid with the edge of the furnace vessel over shear stresses generated by the cover movement are solvable.
• the receiving facial expression is formed as a lever and rotatably mounted on the rotary and / or lifting portal on one of these associated recording and connected to the second pick-up point of the recording mimic with the hydraulic cylinder.
• the coolant lines can be shortened and the installation can be carried out more efficiently, since the rotary and / or lifting portal is now an integral part of the coolant supply system.
• the previously provided lid support arms can be omitted. This leads to a reduction in construction height of at least 2 meters and the associated need to cool these components. Savings result not only in the area of significant weight reduction of the lid construction and the elimination of the cost of producing elaborate welded structures, but also in the assembly of these brackets, since the overhead for aligning and welding the brackets omitted on the rotary portal. With regard to the guidance and arrangement of the electrode guide columns, nothing changes in the structure of the rotary and / or lifting portal.
• the cooling water supply to the furnace lid is no longer as usual over long, coming from the transformer house wall hose lines, but lead directly from below through the rotary portal.
• hose lines are also provided here, but they are relatively short and less prone to tearing and thus less dangerous for the oven operation, as in a damage to the hoses no cooling water with the liquid Steel can come into contact.
• the cooling water is led via short hoses flexible and electrically non-conductive to the furnace lid.
• On and / or on the furnace cover flange connections are provided, which are easy and comfortable to reach.
• the furnace cover segments are still supported by a pipe frame with cooling water (cooling water distributor and collector). Radial spokes are replaced by pairs of spokes crossing at right angles.
• the pair of spokes which runs parallel to the oven transverse axis (bend plane), is extended beyond the edge of the lid. At the free ends of these spokes is a pin joint for receiving by the receiving facial expressions (designed as Deckelhubwerkarme). Parallel thereto, brackets are provided on the lower cover ring, each with a pressure plate as counterparts to those of the Deckelhubwerkes (as forces).
• the furnace cover can be reached via a fixed staircase on the tilting platform. A stage level on the furnace lid allows direct access to the electrode clamping devices, as well as direct and easy access to the flange connections and shut-off fittings of the furnace cover cooling water supply. To change the lid heart or the entire lid of this is separated after the last tap of the cooling water system.
• the rotary portal can be swung together with the Elektrodentrag- arm system without operating the utilizatmimik (then trained as Deckelhubwerk).
• the furnace lid remains on the furnace vessel and is now free for a hall crane and easily accessible. Due to the simplified rise on the furnace cover and the direct accessibility to the cooling water system significantly shorter downtimes and thus a higher availability of such an EAF furnace can be achieved.
• the stage lid is assigned to a stage level, which is accessible via a staircase. This creates the most level work surface that can be safely and comfortably committed.
• the flange connections of the coolant guide system on the furnace lid are designed as quick couplings in a further advantageous embodiment of the present invention.
• Figure 1 is a plan view of an inventive EAF oven with closed and open furnace lid.
• FIG. 2 shows a side view of the invention EAF oven with lifting and / or rotating portal and closed furnace lid with retracted hydraulic cylinder.
• FIG. 3 shows a side view of the EAF oven according to the invention with the hydraulic cylinder started shortly before lifting the oven lid;
• FIG. 4 shows a side view of the EAF furnace according to the invention with the furnace cover tipped by the hydraulic cylinder;
• Fig. 5 is a side view of the EAF furnace according to the invention with fully raised by the hydraulic cylinder furnace cover.
• the electric arc furnace 10 according to the invention essentially consists of a furnace vessel 11 which is tiltably mounted on a tilting platform 12.
• the furnace vessel 11 can be covered with a furnace lid 13.
• the furnace lid 13 is lowered or raised and / or pivoted with a rotating and / or lifting portal 14, as can be seen in particular from FIG. 1, in which the furnace lid 13 is also shown as a pivoted oven lid 13a.
• the furnace cover 13 is a self-supporting structure and forms a support arm system 26.
• radial spokes 15, 16 and 17, 18 interconnected at right angles crossing to the supporting skeleton.
• the pair of spokes 17, 18, which runs parallel to the furnace transverse axis (bend plane), is formed extended beyond the lid edge 19 of the furnace lid 13.
• the spokes 17, 18 have free ends 20, 21, which pin joints 33, 34 are assigned.
• a trained as a lever arm Fremik 22 is the
• Rotary and / or lifting portal 14 assigned.
• the recording facial expressions 22 is articulated via a receptacle 27 on the rotary and / or lifting portal 14.
• the recording facial expression 22 is raised by means of a hydraulic cylinder 28, which is articulated to the base of the rotary and / or lifting portal 14 at a first receiving point 29.
• the hydraulic cylinder With a second pick-up point 30, the hydraulic cylinder is operatively connected to the pick-up mimic 22 in alignment with the first pick-up point 29.
• the recording facial expressions 22 are associated with bearing cavities 31, 32.
• the receiving mimic 22 is now raised via the hydraulic cylinder 28, so that in this way the bearing recesses 31, 32 in the pin joints 33, 34 of the free ends 20, 21 of the radial spokes 17, 18 of the furnace lid 13 can engage frictionally; as shown in particular in Fig. 3.
• brackets 24 are provided on the lower cover ring 23, which each have a pressure plate 25 and, as force counterparts, lie flat against a support region 45 assigned to the absorption feature 22.
• the furnace cover 13 has openings 35, 36 on its upper side 41, through which electrodes 37, 38 can be guided into the furnace vessel 11.
• the electrodes 37, 38 are clamped to an electrode support arm 39. It is intended to decouple the electrodes 37, 38 both mechanically and electrically from the rotary and / or lifting portal 14.
• the furnace cover 13 is also associated with a flue gas outlet 40, via which the blast furnace gases produced during the melting process are discharged.
• the furnace cover 3 is accessible via a permanently installed on the tilting platform 12 stairs 42.
• a provided on the furnace cover 13 stage level 43 allows direct and easy access to the electrodes 37, 38 and their fixtures and flange connections and shut-off valves (both not shown) of a coolant guide system only partially shown 44, via which the electric arc furnace 10 are subjected to a coolant can.
• the lever arm of the receiving mimic 22 is designed so that when lifting the furnace cover 13 horizontal displacements are generated, which in the region of the passage openings 35, 36 for the electrodes 37, 38 in the furnace lid 13 negligible, in the interface plane of the furnace vessel opening 46 of the furnace vessel 11 but are formed so that adhesions of the furnace lid 13 are solved with the edge 47 of the furnace vessel 11 generated by the cover movement shear stresses.
• the coolant guide system 44 is envisaged to form the coolant guide system 44 from a combination of rigid tubing and flexible tube sections.
• the coolant supply system 44 is guided directly through the rotary and / or lifting portal 14.
• a line 48 exits from a side facing away from the hydraulic cylinder 28 on the rotating and / or lifting portal 14 again and is passed over the Fremimik 22 to the furnace cover 13, where it is connected, for example via a flange.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Vertical, Hearth, Or Arc Furnaces (AREA)
• Furnace Housings, Linings, Walls, And Ceilings (AREA)
• Furnace Details (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=47172189

Family Applications (1)

Country Status (4)

Cited By (3)

Families Citing this family (2)

Citations (5)

• 2011
  • 2011-11-23 DE DE201110119797 patent/DE102011119797A1/de not_active Withdrawn
• 2012
  • 2012-09-27 WO PCT/DE2012/000992 patent/WO2013075682A1/de not_active Ceased
  • 2012-09-27 EP EP12784203.7A patent/EP2783178B1/de active Active
  • 2012-09-27 IN IN4442CHN2014 patent/IN2014CN04442A/en unknown

Patent Citations (5)

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