US3589690A - Walking beam furnaces - Google Patents

Walking beam furnaces Download PDF

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Publication number
US3589690A
US3589690A US846870A US3589690DA US3589690A US 3589690 A US3589690 A US 3589690A US 846870 A US846870 A US 846870A US 3589690D A US3589690D A US 3589690DA US 3589690 A US3589690 A US 3589690A
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United States
Prior art keywords
walking beam
furnace
walking
beams
goods
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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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US846870A
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English (en)
Inventor
John Erland Erixson
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.)
Svenska Metallverkens UGNS AB
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Svenska Metallverkens UGNS AB
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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
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path
    • F27B9/201—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path walking beam furnace

Definitions

  • the present invention relates to an arrangement in walking beam furnaces, including at least one movable walking beam which extends substantially in the feed direction of the furnace, and stationary supporting beams arranged adjacent to each walking beam, on both sides thereof.
  • the portions of the goods under treatment located above the gaps between the stationary and moving beams are heated to a lesser extent than the remaining portions of the goods.
  • the lower temperature of these portions is of small or no importance, but when greater demands are placed on quality and tolerances such temperature differentials cause disadvantages.
  • the walking beam be tapered along at least a part of its length.
  • FIG. 1 shows diagrammatically a longitudinal-sectional view in vertical projection of a walking beam furnace
  • FIG. 2 is a fragmentary cross-sectional view of the furnace illustrated in FIG. 1,
  • FIG. 3 is a view of the furnace illustrated in FIGS. 1 and 2, in horizontal section, showing an embodiment of the beam arrangement according to the invention.
  • FIG. 4 is a view similar to the view of FIG. 3, and illustrates an additional embodiment of the beam arrangement according to the invention.
  • the hearth of a walking beam furnace comprises two movable walking beams and stationary supporting beams 11, which extend adjacent the walking beams, on both sides thereof.
  • the illustrated furnace has only one heating zone, 12, which is heated by means of appropriate burners 13 arranged in the end wall of the furnace at the discharge end thereof.
  • This arrangement is not restrictive of the invention, and more zones may be provided and different burner arrangements may be employed.
  • the waste gases are passed from the furnace through an exhaust outlet 14 located at the infeed end of the furnace.
  • the walking beams 10 rest on support wheels 15 journaled in angle arms 16, which in turn are journaled in bearing blocks 17 attached to stands 18.
  • a pull rod 20 is Connected to the arms 16 via a pull rod 20 to the arms 16 via a pull rod 20 to the arms 16 via a pull rod 20 to the arms 16 via a pull rod 20.
  • a hydraulic lifting cylinder 19 Connected to the arms 16 via a pull rod 20 is a hydraulic lifting cylinder 19, by means of which the movable beams can be raised and lowered in a known manner.
  • ble beams can be raised and lowered and moved horizontally back and forth are suitably capable of being adjusted, to enablc these limits to be adapted in the most convenient manner to the goods, the dimensions for which the furnace has been constructed.
  • the time interval between two succeeding beam cycles, comprising moving the beam rearward, raising the beam, moving the beam forward and lowering the beam, is also preferably capable of being varied.
  • the walking beams 10 are shown with full lines in a lowered position and with chain lines in a raised position.
  • a liquid trap 24 adapted to seal the furnace space from the beam machinery room 22 beneath the hearth and to collect scale and/or slag dropping from the goods 23.
  • the chutes of the liquid trap 24 are constructed so that they can be cleaned of scale and other impurities falling therein through the aforementioned gaps.
  • the goods 23 are fed to the furnace through a charging hatch 25 by means of a ram device 26, and are advanced intermittently through the furnace, to be finally pushed onto an outfeed chute 27 and leave the furnace through an exit hatch 28.
  • the direction in which the long sides of each walking beam extend forms an angle in at least certain portions of the furnace with the feed direction of the walking beam.
  • this is realized by the special construction of the walking beams 10, which taper along the whole of their length towards the discharge end of the furnace.
  • the feed direction of the walking beams is shown by arrows 30.
  • FIG. 4 illustrates another embodiment of the beam arrangement of the invention.
  • the walking beams 31 only taper at those portions thereof situated nearest the discharge end of the furnace, while the long sides of said beams 31 and the adjacent long sides of the supporting beams 32 nearest the infeed end of the furnace extend in a known manner, parallel with the feed direction 30 of the walking beams.
  • the walking beams 10 or 31 are suitably held advanced in rest position between the walking cycle, to such an extent that the gaps 29 between the supporting beams and the walking beams 10 and the tapering portions of beams 31 respectively become small, or are essentially eliminated.
  • the hearth of the furnace is thereby essentially sealed and the heat losses are small, so that the temperature differences in the material of the goods are further equalized when the walking beams are stationary.
  • a walking beam furnace including at least one movable walking beam which extends substantially in the feed direction of the furnace, and stationary supporting beams arranged adjacent to each walking beam on both sides thereof, the improvement comprising the provision that the walking beam tapers along at least a portion of its length.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Tunnel Furnaces (AREA)
US846870A 1968-08-02 1969-08-01 Walking beam furnaces Expired - Lifetime US3589690A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE10515/68A SE320401B (enrdf_load_html_response) 1968-08-02 1968-08-02

Publications (1)

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US3589690A true US3589690A (en) 1971-06-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
US846870A Expired - Lifetime US3589690A (en) 1968-08-02 1969-08-01 Walking beam furnaces

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US (1) US3589690A (enrdf_load_html_response)
FR (1) FR2014994A1 (enrdf_load_html_response)
GB (1) GB1203529A (enrdf_load_html_response)
SE (1) SE320401B (enrdf_load_html_response)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2835240C2 (de) * 1978-08-11 1984-12-20 Klöckner-Werke AG, 4100 Duisburg Hubherdofen

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3398939A (en) * 1966-08-26 1968-08-27 Sunbeam Corp Shuttle hearth furnaces

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3398939A (en) * 1966-08-26 1968-08-27 Sunbeam Corp Shuttle hearth furnaces

Also Published As

Publication number Publication date
SE320401B (enrdf_load_html_response) 1970-02-09
FR2014994A1 (enrdf_load_html_response) 1970-04-24
GB1203529A (en) 1970-08-26

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