US3915441A - Heating furnace of walking beam type - Google Patents

Heating furnace of walking beam type Download PDF

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Publication number
US3915441A
US3915441A US435963A US43596374A US3915441A US 3915441 A US3915441 A US 3915441A US 435963 A US435963 A US 435963A US 43596374 A US43596374 A US 43596374A US 3915441 A US3915441 A US 3915441A
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United States
Prior art keywords
heating furnace
hearth
beams
fixed
scale
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Expired - Lifetime
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US435963A
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English (en)
Inventor
Toshiaki Matsukawa
Masayuki Yamamoto
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Nippon Steel Corp
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Nippon Steel Corp
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Filing date
Publication date
Priority claimed from JP1107073U external-priority patent/JPS5256333Y2/ja
Priority claimed from JP5209173U external-priority patent/JPS5238565Y2/ja
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Application granted granted Critical
Publication of US3915441A publication Critical patent/US3915441A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • ABSTRACT Foreign Application Priority Data A walking beam type heating furnace consisting of Jan. 24, 1973 Japan 48-11070 movable skid beams and fixed skid beams, wherein the May 2, 1973 Japan 48-52091 fixed skid beams are supported by cross beams each having both ends fixed on the side walls of the heating [52] US. Cl. 266/5; 266/5 F; 432/11; furnace, with intermediate members downwardly ex- 432/121 tending from each of the fixed skid beams to a cross [51] Int. Cl.
  • the present invention relates to the improvement of a walking beam type heating furnace and more particularly is directed toward the apparatus provided in the heating furnace consisting of fixed skid beams and movable skid beams for transporting heated materials.
  • the transporting apparatus of the heating furnace of the walking beam type consists of a number of rows of fixed skid beams and of movable skid beams and a device for driving the movable skid beams.
  • the walking beam type of the transporting apparatus of the heating furnace has many advantages, some of which are: The heated materials have little skid mark left thereon; operations can be done in various ways; and the materials are not removed from the beams while heated in the furnace. Therefore, this type of transporting apparatus has recently become quite popular.
  • the conventional furnace is so devised that scale is scraped out through trouble holes provided on the side wall during heating operation, or molten scale is discharged after the furnace body is cooled after the operation.
  • rapid cooling of the furnace body by water spray into the furnace damages the brick structure and causes spalling or like troubles in the worst case.
  • An object of the present invention is to provide a heating furnace of the walking beam type, with thermal efficiency maintained very high because of a small 'number of openings provided on the hearth.
  • Another object of the present invention is to provide a heating furnace of the walking beam type, equipped to automatically discharge deposits of scale, made during heating operation, thereby preventing troubles caused by such deposits of scale.
  • a further object of the present invention is to provide a heating furnace of the walking beam type with the structure below the hearth being so simple as to greatly save construction cost.
  • the heating furnace of the walking beam type is so characterized that in the walking beam type heating furnace, consisting of movable skid beams and fixed skid beams, such fixed skid beams are supported by cross beams having both ends fixed onthe side walls of the heating furnace, with intermediate members extending downwardly from each of the fixed skid beams to a cross beam so as to form a prescribed space between the fixed skid beams and the cross beams; support pipes for supporting such movable skid beams are fixed on the hearth; and said hearth is formed for free parallelogrammic movement by connection with a driving device.
  • FIG. 1 and FIG. 2 are elevations in section respectively showing an embodiment of the walking beam type heating furnace according to the present invention.
  • FIG. 3 is a plan view of part of the heating furnace of FIG. 2.
  • FIG. 4 is an elevation in section of another embodiment of the walking beam type heating furnace improved according to the present invention.
  • FIG. 5 is a sectional view of the heating furnace of FIG. 1 taken on the line V V of FIG. 4, to show part of said heating fumance.
  • FIG. 6 is a side elevation in section of the heating furnace of FIG. 4.
  • FIG. 7 is a sectional view of the heating furnace of FIG. 6 taken on the line VII VII of FIG. 6.
  • FIG. 8a and FIG. 8b are sectional views of an embodiment of the connection mechanism between a cross beam and a fixed skid beam according to the present invention.
  • FIG. 9 and FIG. 10 are explanatory sketches of embodiments of the structure of the opening on the hearth according to the present invention.
  • FIG. 11 is a sectional view of part of the heating furnace of FIG. 4.
  • FIG. 12 is a diagram showing a driving cycle of the walking beam.
  • FIG. 13 is an elevation in section of another embodiment of the heating furnace of the present invention.
  • FIG. 14 is a sectional view of part of the heating furnace of FIG. 13.
  • numeral 11 indicates a fixed skid beam; and numeral 21 indicates a movable skid beam; both being constructed with a pipe which has cooling water circulating inside for cooling itself.
  • the strucutre of the skid beams for holding tobe-heated material M there is no type peculiar to the apparatus of the present invention. Any of the rail type, stud type or the like may be used,
  • Each of the fixed skid beams 11 are supported by cross beams 16 through respective intermediate members 12.
  • the cross beams 16 are provided in the width direction of the heating fumance, in parallel with the surface of the hearth and spaced at appropriate intervals along the longitudinal direction of the heating furnace, both ends of each cross beam being fixed on side walls 2 of the heating furnace I.
  • Said intermediate member 12 is provided for preventing the movable skid beam 21, during a movement, from hitting the cross beam 16.
  • it may be formed into I-shaped tubular member 13 integrated with the fixed skid beam 11 and communicating therewith as shown in FIG. 8a or into inverted T- shaped tubular member 14 integrated with the tubular cross beam 16 and communicating therewith as shown in FIG. 8b, thereby making cooling water coming through the-fixed skid beam 11 and the cross beam 16 run, respectively, through the tubular member 13 and 14.
  • baffle plate in side such pipe increases the cooling effect, such plate extending downward or upward to turn, respectively, down or up, cooling water coming horizontally, respectively through the fixed skid beam 11 or the cross beam 16, so as to have the flow reach the lower end or the upper end of respective tubular members.
  • Said movable skid beam 21 is supported by support pipes 22, which are fixed on hearth 23 constituting the bottom of the heating furnace 1.
  • the hearth 23 covers the bottom of the heating fumace 1, but it has an appropriate space from the wall of the heating furnace provided for its vertical and forward and backward movements.
  • Said hearth 23 is connected with driving device 31 so as to make parallelogrammic movement.
  • driving device any of the lever type, roller type or motor cam type may be used.
  • the driving device 31 used in this embodiment is of the lever type as shown in FIG. 6.
  • the hearth 23 is supported, through girder 32 (FIG. 4), by a pair of beams 33 extending in the longitudinal direction of the furnace 1.
  • the end of the beams 33 are connected with shift cylinder 34 working on air or oil.
  • lift cylinder 35 below the beams 33 there is provided lift cylinder 35, with which a plurality of bell cranks 37 are connected through connecting rod 36.
  • Each said bell crank 37 is supported, at its central part, for free rotation, by a shaft 38 supported by a bearing 40.
  • At the tip of each said crank 37 is set a roller 39.
  • Said beams 33 are supported from below by the rollers 39.
  • the beams 33 are put into forward and backward movement by the shift cylinder 34, and into vertical movement by the lift cylinder 35, the cooperation between these cylinders 34 and 35 putting the hearth 23, that is, the movable skid beams 21 into such parallelogrammic movement as mentioned above.
  • numeral 3 indicates an opening, which is equipped with sealing device 4, such as water seal.
  • sealing device 4 such as water seal.
  • the central part of the hearth 23 is elevated with a downward slope to respective side walls 2 and molten scale runs to the wall part on both sides, so that it flows into scale box 41 provided at each opening 3, as shown in FIG. 9.
  • a heating source (not shown) is provided near the opening 3, so as to facilitate the flowing-in of molten scale.
  • water jets 42 for crashing scale.
  • the cetral part of the hearth may be lowered.
  • FIG. 2 and FIG. 3 show another embodiment of the heating furnace of the present invention.
  • each cross beam 16 is supported by an intermediate support 17 having its lower end fixed on the foundation 6 and extending perpendicularly through an opening 18 provided on the hearth 23.
  • Such opening 18 is a hole of sufficient width as to allow the hearth 23 to make its foward and backward movement free from the intermediate support 17.
  • the part of the opening 18 through which the intermediate support 17 runs is sealed with sealing device 19.
  • the number of intermediate supports used for one cross beam it may vary from one, as in the case of this embodiment, to any plurality.
  • This embodiment is suited particularly for a heating furnace of great width, since a cross beam that is supported only at both ends must be large in order to be as strong as required, but such length causes the following complications.
  • the heating furnace of FIG. 4 is equipped with a mechanism for automatically discharging molten scale.
  • Numeral 51 indicates a scale scraper, which lies parallel with the surface of the hearth 23, having both ends fixed respectively on the lower part of side walls 2.
  • said scale scraper 51 should be close to the surface of said hearth 23.
  • Such scale scrapers 51 are made of heat resisting steel, or, in the case of this embodiment, they are constructed with watercooled pipe, and it will be more effective for preventing degradation of thermal efficiency of the furnace as well as melting of the scraper if said scale scrapers 51 are also lined outside with a refractory material 52.
  • a downward projection 53 at the part for direct scraping of scale will be very effective for the prevention of peeling off of the lining 52.
  • a plurality of such scale scrapers 51 are disposed at appropriate intervals along the longitudinal direction of the heating furnace' Numeral 54" indicates an opening'rnade on the 's ur faceof thehearth 23, for letting scale, which has been scraped by the scale scrapers 51, fall thr'ethrough. The scale is then discharged through scale discharging chute 55, et'cfou't of the heating furnace.
  • intervals in the long direction of the heating fuma'ce andsetting positions of the scale scrapers 51 and the opening 54 they should be determined by taking into consideration cycles of parallelogrammic movement; More particularly regarding the setting position -of theopenings 54, they should be within orzatthe-end of the zone where the scale scrapers'51 function.
  • the cross beam 16 is supported by intermediate supports 56, each lower'end of whichisfixed on'the foundation 6.
  • fixation of a scale scraper 51 on the intermediate supports 56, as shown in FIG. 14, will increase the strength of the scale scraper 51, making it possible to reduce the diameter of the scale scraper 51 and resulting in raising thermal efficiency.
  • FIG. 11 shows the situation when the hearth stays at the point A
  • the tip of the scale scraper 51 enters into the deposit of scale S, making the distance h to the surface of the hearth 23 very small.
  • scale S on the hearth 23 is scraped by the scale scraper 51 in the direction (with the arrow F) reverse to the direction (with the arrow R) of movement of the hearth 23, and then it falls through the openings 54 into the scale discharging chute 55, to be discharged out by jetting water or the like.
  • the hearth 23 moves from the point C to the point D, and then returns to the point A.
  • the heating furnace of the present invention is so constructed that the hearth itself makes a parallelogrammic movement, thereby driving movable skid beams, with the following advantages over the heating furnace of conventional type:
  • seal boxes are provided for every row of movable beams (more than four rows in ordinary cases), leaving a clearance about 400 mm wide. But, according to the present invention, the number of rows is two, and the clearance between them may be as little as 50 to lOO mm.
  • the foundation of the heating furnace according to the present invention need not be as deep as in the case of the heating furnace of conventional type; and such foundation having less depth will save construction costs.”
  • the heatingfurnace the conventional type, it has seal boxes' provided below the hearth, and also the walking beam frame below the seal boxes,
  • the structure below the hearth is so simple that the depth of the foundation is required to be only 800 to 1,000 mm.
  • a support pipe of the movable beam is fixed on the walking frame, so that it is long and easy to deform, causing nosing of heated materials when they are transported through the furnace.
  • such pipe is fixed on the hearth, therefore, it is so short as-to be free from such problems as mentioned above with the furnace of conventional type, and increases the stability of its operation.
  • the shorter size of support pipe decreases the size of inner pipe which is inserted into the support pipe, making periodical inspection and maintenance very easy.
  • deposits of scale can be automatically discharged by a very simple mechanism.
  • cross beams positioned in the width direction of the heating furnace, in parallel with the surface of the hearth at intervals for supporting said fixed skid beams, each of said cross beams having both ends fixed on side walls of the heating furnace;
  • intermediate members extending downwardly from a fixed skid beam to a cross beam so as to form a required space between the fixed skid beams and the cross beams; support pipes connecting said movable skid beams and the hearth;
  • a driving device connected with the hearth so as to have the hearth make parallelogrammic movement.
  • each said intermediate member is a T-shaped tubular member, integrated with a tubular fixed skid beam and communicating therewith, with a baffle plate extending perpendicularly downwardly inside each of the intermediate members, cooling water flowing from the fixed skid beams through said intermediate members.
  • each said intermediate member is an inverted T-shaped tubular member integrated with a tubular cross beam and communicating therewith, with a baffle plate extending upwardly inside each of the intermediate members, cooling water flowing from the cross beams through said intermediate members.
  • the improvement which comprises cross beams positioned in the width direction of the heating furnace, in parallel with the surface of the hearth and at intervals for supporting said fixed skid beams, each of said cross beams having both ends fixed on side walls of the heating furnace; intermediate members extending downwardly from a fixed skid beam to a cross beam so as to form a required space between the fixed skid beams and the cross beams; support pipes fixing said movable skid beams on the hearth; a driving device connected with the hearth so as to have the hearth make parallelogrammic movement; scale scrapers provided in the width direction of the heating furnace, in parallel with the surface of the heating furnace and at intervals, each of said scale scrapers having both ends fixed on the lower part of side walls of the heating furnace, said hearth having openings for discharging scale.
  • each of said scale scrapers has a projection pointing downwardly for scraping scale.
  • each said scale scraper is fixed on an intermediate support having its upper end and lower end fixed

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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)
US435963A 1973-01-24 1974-01-23 Heating furnace of walking beam type Expired - Lifetime US3915441A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1107073U JPS5256333Y2 (it) 1973-01-24 1973-01-24
JP5209173U JPS5238565Y2 (it) 1973-05-02 1973-05-02

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US3915441A true US3915441A (en) 1975-10-28

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US (1) US3915441A (it)
AU (1) AU475264B2 (it)
BR (1) BR7400500D0 (it)
CA (1) CA1010648A (it)
FR (1) FR2214872B1 (it)
GB (1) GB1428293A (it)
IT (1) IT1009583B (it)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4198560A (en) * 1977-07-11 1980-04-15 Cavalier Products, Inc. Walking beam shrink tunnel apparatus
US4201542A (en) * 1977-06-30 1980-05-06 S.I.T.I. Societa Impianti Termoelettrici Industriali (s.a.s.) Oven for firing ceramic material or the like
DE3843002A1 (de) * 1988-12-08 1990-06-13 Didier Eng Verfahren und waermofen zum waermen von knueppeln, bloecken, brammen, blechen und dergleichen waermgut
US5232359A (en) * 1991-07-26 1993-08-03 Campbell Frank Jun Device for increasing the thermal radiation heat transfer on an object in a furnace
US5607144A (en) * 1994-09-27 1997-03-04 Stein Heurtey Furnace for reheating, holding and storing of metallurgical products
KR101372746B1 (ko) * 2007-12-27 2014-03-26 주식회사 포스코 스키드빔의 이물질 제거 장치

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102778125B (zh) * 2012-08-27 2016-04-20 天津立林石油机械有限公司 双门双台车高温烧结炉生产线

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2017024A (en) * 1934-08-31 1935-10-08 Surface Combustion Corp Walking beam furnace
US3606280A (en) * 1969-11-14 1971-09-20 Granco Equipment Walking beam furnace construction
US3633885A (en) * 1970-03-20 1972-01-11 Btu Eng Corp Movable hearth furnace
US3656720A (en) * 1970-03-16 1972-04-18 Hayes Inc C I Heat treating furnace with walking beam drive

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2017024A (en) * 1934-08-31 1935-10-08 Surface Combustion Corp Walking beam furnace
US3606280A (en) * 1969-11-14 1971-09-20 Granco Equipment Walking beam furnace construction
US3656720A (en) * 1970-03-16 1972-04-18 Hayes Inc C I Heat treating furnace with walking beam drive
US3633885A (en) * 1970-03-20 1972-01-11 Btu Eng Corp Movable hearth furnace

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4201542A (en) * 1977-06-30 1980-05-06 S.I.T.I. Societa Impianti Termoelettrici Industriali (s.a.s.) Oven for firing ceramic material or the like
US4198560A (en) * 1977-07-11 1980-04-15 Cavalier Products, Inc. Walking beam shrink tunnel apparatus
DE3843002A1 (de) * 1988-12-08 1990-06-13 Didier Eng Verfahren und waermofen zum waermen von knueppeln, bloecken, brammen, blechen und dergleichen waermgut
US5232359A (en) * 1991-07-26 1993-08-03 Campbell Frank Jun Device for increasing the thermal radiation heat transfer on an object in a furnace
US5607144A (en) * 1994-09-27 1997-03-04 Stein Heurtey Furnace for reheating, holding and storing of metallurgical products
KR101372746B1 (ko) * 2007-12-27 2014-03-26 주식회사 포스코 스키드빔의 이물질 제거 장치

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Publication number Publication date
GB1428293A (en) 1976-03-17
CA1010648A (en) 1977-05-24
AU475264B2 (en) 1976-08-19
FR2214872A1 (it) 1974-08-19
AU6471774A (en) 1975-07-24
FR2214872B1 (it) 1977-03-04
DE2402782B2 (de) 1976-02-26
IT1009583B (it) 1976-12-20
DE2402782A1 (de) 1974-07-25
BR7400500D0 (pt) 1974-08-22

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