US3749550A - Walking beam furnace - Google Patents

Walking beam furnace Download PDF

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Publication number
US3749550A
US3749550A US00208846A US3749550DA US3749550A US 3749550 A US3749550 A US 3749550A US 00208846 A US00208846 A US 00208846A US 3749550D A US3749550D A US 3749550DA US 3749550 A US3749550 A US 3749550A
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Prior art keywords
traversing
section
furnace
idler
sections
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US00208846A
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English (en)
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W Suydam
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Loftus Engineering Corp
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Loftus Engineering Corp
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    • 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 tunnel furnace
    • 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 tunnel furnace walking beam furnace
    • F27B9/202—Conveyor mechanisms therefor
    • F27B9/203—Conveyor mechanisms therefor having ramps

Definitions

  • Parmelee [57] ABSTRACT The improvement in top and bottom-fired walking beam furnaces wherein the lower burners, like the top ones, fire opposite to the direction of travel of the work pieces from the charging to the discharge end of the furnace.
  • This is accomplished by the use of a plurality of parallel walking beam assemblies, each of which has two spaced stationary water-cooled beam sections having a supporting rail along the top. The bottoms of these side pieces are rigidly integrated through a bottom water-cooled beam section.
  • a longitudinallymovable traversing beam section having a loadtraversing rail at its top which is lifted above the support rails on the side beam members when the idler beam raises, but which is normally lower than the support rails. After the traversing beam is raised it is moved longitudinally toward the discharge end of the furnace and when it is lowered it is returned to its normal position.
  • Combined tie rods and spacers at intervals along the assembly connect the upper portions of the side beam sections so that the girder is in effect a box section within which are the walking beam elements.
  • Mechanism outside the furnace at one end moves the idler beam section and at the opposite end moves the traversing beam member, and each holds its beam against endwise travel when the other is moving.
  • This invention is for a walking beam assembly for use in a furnace for the heating of billets and slabs preparatory to hot rolling them into semi-finished or finished products.
  • the present invention provides a top and bottom fired walking beam furnace where the fixed and traversing work supports are combined in a rigid girderlike assembly that generally extends from the entrance door of the furnace to the exit and which is supported at each end of the furnace. Intermediate the end supports, these girder-like walking beam assemblies may rest on simple water-cooled beams above the hearth and with supporting posts or jacks that do not interfere with the use of bottom burners that fire opposite the direction of travel of the work pieces, similarly to the top burners.
  • each walking beam assembly comprises two spaced deep parallel side beam sections arranged for water-cooling, providing rigid side beams or truss sections. Between these two sections and spaced from each of them, but rigidly integrated ith them through struts, is an intermediate fixed beam section, which, for reasons hereinafter appearing, is referred to as the ramp section.” There is a second beam section called the idler section" between the two side sections above the ramp section, and which is supported by the ramp section. It is movable longitudinally relative to the side beam members and ramp section, and means interposed between the ramp and idler sections is arranged to raise the idler beam vertically when said beam is moved in one direction, and when moved in the opposite direction from the high limit of travel it moves down to it lowermost position.
  • traversing beam section above the idler section supported by means, as for example rollers, interposed between the traverse and idler sections so that it is movable longitudinally relative to the idler sections.
  • This traversing beam section is lifted and lowered by the raising and lowering of the idler section.
  • a work piece lifting rail along its top is below the rails at the top of the side beam sections, but at the upper limit of the idler beam travel the rail at the top of the traversing section is above the level of the work support rails of the side beam sections.
  • the bottom burners can be and are positioned to fire longitudinally of the beam assemblies, and slotted hearths, scale deflectors and water seals are eliminated.
  • FIG. 1 is a longitudinal section through a walking beam furnace embodying the invention
  • FIG. 2 is a plan view of the interior furnace of FIG. 1 being essentially a horizontal section in the plane of line II-II of FIG. 1;
  • FIG. 3 is a transverse section through the furnace substantially in the plane of line Illlll of FIG. 1;
  • FIG. 4 is a transverse section on a larger scale of one single beam system with its fixed and movable rails showing the movable or traverse rail in its lowermost position, the view being a transverse section in the same plane as FIG. 3;
  • FIG. 5 is a view similar to FIG. 4 showing the top porion of the assembly with the movable or traverse rail raised to its upper limit of travel;
  • FIG. 6 is a fragmentary longitudinal section in substantially the plane of line VI-VI of FIG. 4 showing in side elevation a portion of the lifting-ramp section of the assembly along with portions of the idler beams and traversing beam, with the traversing beam in its lowermost or normal position;
  • FIG. 7 is a view similar to FIG. 6 with the traversing beam raised and the work pieces shifted to the left, at which point the traversing beam is about to be lowered.
  • the numeral 2 designates generally the top or roof structure of a furnace and 3 designates generally the entire hearth area of the furnace.
  • the front wall is designated 4, and 5 is the charging door or opening.
  • the rear wall is designated 6 and has a discharge door at 7.
  • the side walls of the furnace are marked 8.
  • the work pieces to be heated i.e., slabs or billets
  • enter the furnace through the charging door being usually pushed on supporting skids to a selected position outside the charging end of the furnace, the door is a well-known or preferred manner by mechanism forming no part of this invention, and they progress in increments through the furnace in the direction of the arrow, each work piece being parallel with the preceding one, toward the discharge door.
  • FIG. 2 there are, in the structure here shown, six of these assemblies spaced from one another and from the side walls of the furnace, with three of them each side of the center line, but the number may vary, although for present mill practice six permit a good combination of long and half-length slabs to be simultaneously or successively moved through the furnace.
  • S and S are long and short slabs, respectively.
  • the assemblies 10 preferably extend through the charging or front end of the furnace and are supported on a structure outside the furnace. At the discharge or rear end of the furnace these assemblies 10 also extend through the rear wall and are supported on a structure outside the rear wall.
  • the assemblies 10 are supported at the front end on a structure outside of the furnace and at the opposite end on a structure outside of the furnace.
  • the beams 11 are hollow for water-cooling and having their ends supported in the side walls of the furnace and which are supported intermediate their ends by hollow vertical columns 12 which are also designed to be water-cooled.
  • jacks 12' to provide support. Water-cooling of structures of this kind is per se well known in the art and I have not shown in detail cooling water inlet and outlet connections.
  • the columns I2 and jacks 12' are arranged in rows lengthwise of the furnace so that, from front to back each such post and intervening jack in a row is directly behind the one ahead, and as seen in FIG. 2 the space under the supporting beams 10 and above the hearth is relatively open and clear of any obstruction.
  • the bottom of the hearth structure has two offsets providing vertical wall porions 13 in each of which is a horizontal row of burner ports 14 with bottom burners 15 therein for directing flames upwardly and forwardly toward the charging door.
  • the hearth is of course spaced above the floor of the entire furnace to provide space for the fuel and air ducts.
  • the flames and hot combustion gases travel longitudinally forward under the assemblies 10 for discharge through a flue 16 at the front of the furnace.
  • the top or roof structure of the furnace has an offset providing a vertical burner wall 17 with a horizontal row of burner ports for top firing burners 18 that project flames downwardly and forwardly opposite to the direction of travel of the work pieces through the furnace. Rearwardly of these burners 18 there are roof burners 19 in the roof over the soaking zone.
  • Each beam assembly is a girder extending, as previously described, from one end of the furnace to the other. It has two parallel side sections designated generally as 25, each of which, as here shown, provide a number of longitudinallyextending passages 26 one above another. They comprise vertically-elongated generally rectangular sections and may be formed of four-sided tube sections 25 placed one upon another and welded together, or perhaps for heavier loads be formed of heavy metal plates with weldments to provide a similar beam section with spaced side walls and top and bottom walls and intermediate partitions.
  • Water inlets and outlets may be formed in the end walls of the beam structures, so arranged that water enters and leaves at the same end, as indicaed at W but at the other end there are return loops W so water leaving one passage reenters and flows in the opposite direction in the next. As here indicated there are four passages 26 in each side section, but there could be more or less, depending on the load that the beam assemblies must carry.
  • each side assembly there is a modified H section 27 in which is a rail 28 which may be of a high temperature refractory material and is sometimes referred to as a rider tile.” While the present indications are that a refractory rail will be preferable, part of its length may be comprised of a high temperature alloy, or the entire rail may be metal.
  • the advantage of using tile or ceramic is that while the I-I-section 27 is water-cooled by its contact with the upper tube 26, the lower heat conductivity of the refractory will reduce or substantially reduce he shadow on the slabs or billets which are supported on the rails during the operation of the furnace.
  • the term shadow of course refers to a restricted area of the work piece which does not receive full heat or from which excessive heat is removed by contact with a cooled support, and shadows are objectionable since they interfere with uniform rolling of the work piece.
  • Struts 3 welded to tube section and the bottom tube sections 26 at relatively close intervals integrate the section 30 and the two side sections 25 at the bottom of the beam assembly and maintain them in parallel spaced relation.
  • the struts are spaced about two feet apart along the length of the beam assembly. The space at each side of the section 30 and the side beams allows gases to circulate and scale to drop down through the assembly.
  • the top of tube 30 has a series of separated inclined ramps thereon. This is provided by cutting notches of the required shape in the top of the section 30 and then welding in the inclined ramp-forming plates 32 and vertical abutment plates 33.
  • Each ramp 32 as here shown has a track section 34 secured to the top thereof along the center of which is a toothed gear rack and there is a bearing or track surface 35 at each side of the rack, the rack being designated as 35'.
  • flanged lifting pinions 36 there are a series of flanged lifting pinions 36, one on each ramp, with a central gear portion 37, roller portions 38 that ride on the track surfaces 35, and peripheral flanges 38a which restrain the rollers against displacement in the axial direction. Resting on these rollers is a track section 39 similar to but confronting the section 34. The section 39 is carried on and secured to the under surface of a longitudinally-extending foursided hollow or tubular section 40 which i term the idler section. The central gear portions of the pinion rollers 36 are engaged in the racks of the confronting track sections 34 and 39 while the roller portions bear on the track surfaces at each side of the respective racks.
  • the arrangement is such that any vertical load is transmitted through the track surfaces and roller surfaces of the rollers and not through the gear teeth of the racks and pinions. It so happens that because of this, the pitch diameter of the gear teeth on the rollers coincides with the diameter of the roller portions on the rollers at each side of the gear teeth, and of course a corresponding relation exists between the gear teeth of the rack and the levels of the track surfaces at each side of the rack.
  • second track section 41 extending along and fixed to the top of the idler beam section 40. It is similar to rack sections 34 and 39 with a central rack and flat track strips at each side of the rack. There are flanged rollers 42 similar to the rollers or lifting pinions 36 at intervals along the section 40 and which may roll on this section. These rollers support a fourth track and rack section 43 fixed on and extending along the underside ofa hollow rigid section 44, which, like all the others, are water-cooled.
  • This section has a modified H section 45 along the top thereof in which is a rail 46, sections 45 and 46 being similar to sections 27 and 28 respectively at the top of the side beam assemblies 25, with the rail 46 being ceramic or metal or a combination of both, depending on which may be best suited to a particular operation.
  • the intermediate fixed bottom beam member 30 is sometimes referred to as the lifting ramp" or ramp section, and the inclined track sections 34 are called the lifting racks.
  • the rollers 36 are the lifting gears or pinions, the section 40 with its track sections 39 and 41 is the idler beam.
  • the upper gear rollers 42 are the transverse pinions or gears and the four-sided beam section 44 is the traverse beam.
  • the rails 28 on the two side beams are the support rails and the rails 46 are the traverse rails.
  • Tie bolts 48 with spacing sleeves 49 and 50 and nuts 51 at intervals along the length of the assembly are located at a level above the idler beam and below the traverse beam and are at a level where they do not restrict the up and down travel of these two beams and at spaced intervals where they are not contacted by the traversing pinions 42.
  • All cylinders 55 are simultaneously operated, and the work pieces S and S that normally are extending across and resting on the supporting rails 28 are lifted clear of said rails and supported on the traverse rails 46, FIG. 5 showing the traverse rail of one assembly, being at the upper limit of its travel. With the traverse rails 46 elevated, pressure is held in the cylinders 55 to keep them elevated.
  • each traverse beam outside the furnace there is a cylinder 60 pivoted to a fixed anchor at 61 with a piston rod 62 that is normally extended and which is pivotally outside the furnace with the traverse beam, the pivoting accommodating the upand-down travel of this beam.
  • this cylinder restrains the traverse beam from moving so that the traverse pinions roll on the top of the idler beam and only the vertical travel of the idler beam is transmitted to the traverse beam.
  • fluid pressure is applied to the cylinders 60 to simultaneously move the elevated traverse beams toward the left a short distance, depending on the size or the pieces in the furnace, the traverse rollers rolling on the then fixed idler beam.
  • the cylinders 55 With the pressure then held in the cylinders 60, the cylinders 55 are pressurized to move their piston rods 56 to the left to correspondingly move the idler beams to the left, causing the lifting pinions to roll down the ramps to their lowermost position, thus lowering the traverse beams to deposit the work pieces back onto the support rails in the position to which they have been advanced.
  • cylinderpiston units 60-62 With the traverse beam at or near its normal level below the supporting rails, cylinderpiston units 60-62 are actuated in the reverse direction to return the traverse beams to their starting positions.
  • the invention provides a walking beam furnace wherein there are a plurality of separate lengthwise-extending water-cooled girders, each comprising two spaced side beam assemblies of deep section from top to bottom integrated through the fixed intermediate lifting ramp secton 30 and the struts 31 and the tie bolts 48 with compression or spacer sleeves near their tops which provide a strong beam assembly of box-girder-like strength and capable of being effectively water-cooled.
  • These side sections have the support rails at their tops.
  • a top and bottom-fired walking beam furnace having a hearth, a roof, and inlet and discharge ends wherein:
  • each assembly comprising a unitary girderlike structure having 1.
  • a top and bottom walking beam furnace as defined in claim 1 in which there is at least one row of burners in close side-by-side relation in the roof extending crosswise of the length of the girders across the full width of the furnace and at least one row of burners in the hearth in close side-by-side relation extending across the full width of the furnace crosswise of the length of the girder.
  • a top and bottom-fired walking beam furnace as defined in claim 1 in which the girder-like structures are supported at each end outside the furnace structure adjacent the inlet and discharge openings and are supported in part above the hearth intermediate their ends on fixed water-cooled beams positioned above the hearth and extending traverse to the lengths of the girder-like structures.
  • a walking beam assembly for use in a top and bottom-fired furnace comprising a composite girder structure having:
  • a traversing beam section extending longitudinally between the upper portions of the side beam sections but spaced from each of them, the traversing beam having work-supporting means along the upper surface thereof,
  • e. means for effecting a work-traversing longitudinal movement of the traversing beam when it is raised and returning it to its original position when it is lowered.
  • a walking beam assembly as defined in claim 7 in which the rails are received in the top of an H-seetion which is set astraddle and extends lengthwise of the tops of the respective beam sections on which rails are provided.
  • a walking beam assembly as defined in claim 6 wherein said means for raising and lowering the traversing beam section comprising an idler beam section extending longitudinally between the side beam sections below the traversing beam section and above the fixed lower beam section arranged to reciprocate relative to both the traversing beam section and the fixed lower beam section, and wherein there are means effective between the lower fixed beam section and the idler beam section arranged to raise the latter when it is moved in one direction and lower it from a raised position when moved in the opposite direction, and means effective between the idler beam section and the traversing beam section for supporting the traversing beam section on the idlerbeam section to raise and lower therewith but which is ineffective to transmit the reciprocable travel of either of said beam section to the other.
  • a walking beam assembly as defined in claim 10 wherein said means for raising and lowering said idler beam section when it is reciprocated relative to the fixed beam section comprises inclined ramps on one of said two sections at intervals therealong and a roller on each ramp between the two sections arranged to roll on said ramps to translate longitudinal motion of the idler beam section into vertical movement thereof.
  • a walking beam assembly for use in top and bottom-fired billet and slab-heating furnaces comprising:
  • the side beams and the traversing beam section each having a work piece-supporting rail along the top edge thereof, the rail on the traversing rail being positioned to lift above the rails of the side beam when the traversing rail is fully raised but is below the rails of the side beams when the traversing beam is lowered,
  • the fixed lower inermediate beam, the idler beam and the traversing beam each being hollow for the circulation of cooling water therethrough.
  • a walking beam assembly as defined in claim 17 wherein there are means extending at intervals along the length of the girder at a level between the idler beam and the traverse beam connecting the upper portions of the two side beams and holding them in parallel spaced relation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Tunnel Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Reciprocating Conveyors (AREA)
US00208846A 1971-12-16 1971-12-16 Walking beam furnace Expired - Lifetime US3749550A (en)

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US20884671A 1971-12-16 1971-12-16

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US3749550A true US3749550A (en) 1973-07-31

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US (1) US3749550A (de)
JP (1) JPS56487B2 (de)
AU (1) AU473952B2 (de)
BE (1) BE792811A (de)
BR (1) BR7208310D0 (de)
CA (1) CA970963A (de)
DE (1) DE2233909A1 (de)
ES (1) ES408138A1 (de)
FR (1) FR2165410A5 (de)
GB (1) GB1368163A (de)
IT (1) IT975352B (de)
SE (1) SE406934B (de)
ZA (1) ZA727751B (de)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3887064A (en) * 1972-10-30 1975-06-03 Brobu Industrie Ofenbau Walking beam conveyor in a furnace
US4009774A (en) * 1972-11-07 1977-03-01 Lutz David E Conveyor
US4116619A (en) * 1977-05-26 1978-09-26 Btu Engineering Corporation Multiple beam furnace
US4212633A (en) * 1978-11-16 1980-07-15 Abar Corporation Vacuum electric furnace
US4236466A (en) * 1979-01-02 1980-12-02 Wheelabrator-Frye Inc. Mechanical actuation of furnace grate beams
US4391587A (en) * 1980-03-27 1983-07-05 Nippon Steel Corporation Slab heating furnace
US4585411A (en) * 1983-07-06 1986-04-29 Italimpianti Societa Italiana Impianti P.A. Method and walking beam furnace for the intermediate heating of pipes in hot rolling mills
US4723909A (en) * 1985-07-24 1988-02-09 Stein Heurtey Walking beam oven for advancing products at different speeds in different sections of the oven
US4741695A (en) * 1985-08-09 1988-05-03 Chugai Ro Co., Ltd. Walking beam type reheating furnace
US4828489A (en) * 1986-12-30 1989-05-09 Francesco Albonetti High speed firing method and kiln, in particular for ceramic materials such as tiles and the like
US4863376A (en) * 1987-02-24 1989-09-05 Italimpianti S.P.A. Walking beam furnace
US5139418A (en) * 1990-03-13 1992-08-18 Stein Heurtey Device for discharging and transferring steelworks products
US5211557A (en) * 1991-10-03 1993-05-18 Taikisha Ltd. Heating furnace
US5391034A (en) * 1991-05-21 1995-02-21 Danieli & C. Officine Meccaniche Spa Furnace with refractory longitudianl members and with central charging for heating and storing hot products
US6672866B1 (en) * 1999-11-29 2004-01-06 Riedhammer Gmbh Continuous furnace for tubular firing material
EP2886986A1 (de) * 2013-12-19 2015-06-24 Andritz MAERZ GmbH Ofen zum Erwärmen von Metallgütern
CN111378827A (zh) * 2020-03-24 2020-07-07 南京正光炉业有限责任公司 步进式镁合金卷带退火炉

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5179505U (de) * 1974-12-19 1976-06-23
DE2926661A1 (de) * 1979-07-02 1981-01-15 Italimpianti Deutschland Indus Hubbalkenofen

Citations (10)

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Publication number Priority date Publication date Assignee Title
US2056070A (en) * 1933-11-15 1936-09-29 Paul S Menough Heating furnace
US3220712A (en) * 1961-08-29 1965-11-30 Jack D Lott Skid support construction
US3258255A (en) * 1963-07-31 1966-06-28 Loftus Engineering Corp Metal heating furnace
US3450394A (en) * 1967-01-30 1969-06-17 Salem Brosius Canada Ltd Walking beam furnace
US3471134A (en) * 1968-02-26 1969-10-07 Midland Ross Corp Walking beam furnace
US3512628A (en) * 1968-07-09 1970-05-19 Multifastener Corp Walking beam conveyor and method
US3544094A (en) * 1967-04-15 1970-12-01 Koppers Wistra Ofenbau Gmbh Metallurgical walking beam furnace
US3565241A (en) * 1968-10-07 1971-02-23 Clark Automation Inc Walking beam transfer apparatus
US3575395A (en) * 1969-11-14 1971-04-20 Granco Equipment Billet heating furnace and conveyor therefor
US3664649A (en) * 1969-04-16 1972-05-23 Brockmann & Bundt Ind Ofenbau Furnace having structure for feeding work through a heat tunnel

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2056070A (en) * 1933-11-15 1936-09-29 Paul S Menough Heating furnace
US3220712A (en) * 1961-08-29 1965-11-30 Jack D Lott Skid support construction
US3258255A (en) * 1963-07-31 1966-06-28 Loftus Engineering Corp Metal heating furnace
US3450394A (en) * 1967-01-30 1969-06-17 Salem Brosius Canada Ltd Walking beam furnace
US3544094A (en) * 1967-04-15 1970-12-01 Koppers Wistra Ofenbau Gmbh Metallurgical walking beam furnace
US3471134A (en) * 1968-02-26 1969-10-07 Midland Ross Corp Walking beam furnace
US3512628A (en) * 1968-07-09 1970-05-19 Multifastener Corp Walking beam conveyor and method
US3565241A (en) * 1968-10-07 1971-02-23 Clark Automation Inc Walking beam transfer apparatus
US3664649A (en) * 1969-04-16 1972-05-23 Brockmann & Bundt Ind Ofenbau Furnace having structure for feeding work through a heat tunnel
US3575395A (en) * 1969-11-14 1971-04-20 Granco Equipment Billet heating furnace and conveyor therefor

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3887064A (en) * 1972-10-30 1975-06-03 Brobu Industrie Ofenbau Walking beam conveyor in a furnace
US4009774A (en) * 1972-11-07 1977-03-01 Lutz David E Conveyor
US4116619A (en) * 1977-05-26 1978-09-26 Btu Engineering Corporation Multiple beam furnace
US4212633A (en) * 1978-11-16 1980-07-15 Abar Corporation Vacuum electric furnace
US4236466A (en) * 1979-01-02 1980-12-02 Wheelabrator-Frye Inc. Mechanical actuation of furnace grate beams
US4391587A (en) * 1980-03-27 1983-07-05 Nippon Steel Corporation Slab heating furnace
US4585411A (en) * 1983-07-06 1986-04-29 Italimpianti Societa Italiana Impianti P.A. Method and walking beam furnace for the intermediate heating of pipes in hot rolling mills
US4723909A (en) * 1985-07-24 1988-02-09 Stein Heurtey Walking beam oven for advancing products at different speeds in different sections of the oven
US4741695A (en) * 1985-08-09 1988-05-03 Chugai Ro Co., Ltd. Walking beam type reheating furnace
US4820150A (en) * 1985-08-09 1989-04-11 Chugai Ro Co., Ltd. Walking beam type reheating furnace
US4828489A (en) * 1986-12-30 1989-05-09 Francesco Albonetti High speed firing method and kiln, in particular for ceramic materials such as tiles and the like
US4863376A (en) * 1987-02-24 1989-09-05 Italimpianti S.P.A. Walking beam furnace
US5139418A (en) * 1990-03-13 1992-08-18 Stein Heurtey Device for discharging and transferring steelworks products
US5391034A (en) * 1991-05-21 1995-02-21 Danieli & C. Officine Meccaniche Spa Furnace with refractory longitudianl members and with central charging for heating and storing hot products
US5211557A (en) * 1991-10-03 1993-05-18 Taikisha Ltd. Heating furnace
US6672866B1 (en) * 1999-11-29 2004-01-06 Riedhammer Gmbh Continuous furnace for tubular firing material
EP2886986A1 (de) * 2013-12-19 2015-06-24 Andritz MAERZ GmbH Ofen zum Erwärmen von Metallgütern
CN111378827A (zh) * 2020-03-24 2020-07-07 南京正光炉业有限责任公司 步进式镁合金卷带退火炉

Also Published As

Publication number Publication date
BE792811A (fr) 1973-06-15
AU4845372A (en) 1974-05-02
BR7208310D0 (pt) 1973-09-13
SE406934B (sv) 1979-03-05
ZA727751B (en) 1973-09-26
IT975352B (it) 1974-07-20
ES408138A1 (es) 1976-02-16
DE2233909A1 (de) 1973-06-20
AU473952B2 (en) 1976-07-08
JPS4866509A (de) 1973-09-12
JPS56487B2 (de) 1981-01-08
CA970963A (en) 1975-07-15
FR2165410A5 (de) 1973-08-03
GB1368163A (en) 1974-09-25

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