US3658171A - Transportation method for use in equipment of movable beam type - Google Patents

Transportation method for use in equipment of movable beam type Download PDF

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Publication number
US3658171A
US3658171A US853442A US3658171DA US3658171A US 3658171 A US3658171 A US 3658171A US 853442 A US853442 A US 853442A US 3658171D A US3658171D A US 3658171DA US 3658171 A US3658171 A US 3658171A
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United States
Prior art keywords
beams
movable
movable beam
speed
fixed
Prior art date
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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US853442A
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English (en)
Inventor
Kenzo Fukada
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.)
Nippon Steel Corp
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Nippon Steel Corp
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Publication date
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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
    • F27B9/30—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B9/40—Arrangements of controlling or monitoring devices
    • 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
    • F27B9/202—Conveyor mechanisms therefor
    • F27B9/203—Conveyor mechanisms therefor having ramps
    • 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
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0028—Regulation
    • F27D2019/0059—Regulation involving the control of the conveyor movement, e.g. speed or sequences

Definitions

  • ABSTRACT A transportation method for use in a heating furnace of movable beam type or other equipment of such type, which transportation is carried out by the movement of the movable beams, such movement being subjected to speed reduction during the upward and the downward strokes just before the upper surface of said movable beams approaches that of the fixed beam.
  • FIG. I I PRIOR ART
  • FIG. 3 PRIOR ART (uIMOVING .1 LL DIRECTION r "HMSIDE *AvW Hr *7 a P DIRECTION r r w (cIVERT DIRECTION UPWARD FOR**DOWN +BACK- WARD -wAR[ -WARD FIG.
  • FIG. 4 PRIOR ART B v B v I F HOR L HOR L L J r l j D A D SPEED SERVO A SERVO P a SETTER I ANPL VALVE .fii/VZo Fu/(HM INVENTOR A/MMLXJZ I'TORNEYSi TRANSPORTATION METHOD FOR USE IN EQUIPMENT OF MOVABLE BEAM TYPE BACKGROUND OF THE INVENTION 1.
  • the present invention relates in general to the improvement of the transportation method in the use of equipment of the movable beam type, and more particularly a method for the driving of the movable beams in a heating furnace of the movable beam type.
  • the transportation device of such equipment as a heating furnace of the movable beam type consists of movable beams, fixed beams and a device for driving said movable beams.
  • the transportation of the to-be-heated materials, etc., in the heating furnace is so made that the to-be-heated material charged on the fixed beam is moved forward step by step by the periodic repititions of the parallel movement of the movable beams.
  • the to-be-heated material charged on the fixed beam is transferred onto and supported by the upward stroke of the movable beam, and moved forward by the forward stroke of the movable beam; then transferred to the position corresponding to the end of said forward stroke on the fixed beam during the downward stroke ofthe movable beam; and then the movable beam takes the backward stroke to return to the starting position to complete a cycle of movement.
  • the to-be-heated material is moved forward step by step in the heating furnace.
  • An object of the present invention is to provide a transportation method for use in equipment of the movable beam type, particularly heating furnaces of such type, whereby the shock produced on the movable beam and shaking caused thereby when the to-be-heated material is transferred from and onto the fixed beam, are reduced to a minimum, so as to prevent the material from moving away from the correct transfer course and also to raise the transportation velocity of the material.
  • Another object of the present invention is to provide a method for driving the movable beams in equipment of the movable beam type, particularly heating furnace of such type, so as to avoid the shock produced on the movable beam and its shaking caused thereby when it is transporting the material, and also so as to raise the transportation velocity of the material.
  • the method is characterized by subjecting the movable beam to a speed reduction just before it approaches the upper surface of the fixed beam during the upward and the downward strokes of the movable beam, thereafter the to-be-transported material being transferred from and onto the fixed beam.
  • the transferring of the to-be-transported material onto the movable beam (from the fixed beam) and onto the fixed beam (from the movable beam), is carried out very softly, thus reducing the shock produced on the walking beam and the shaking caused thereby, as said speed is slowed just before the above transferring.
  • FIG. 1 shows the vertical sectional view ofone embodiment of the conventional, generally used heating furnace of the movable beam type.
  • FIG. 2 shows the speed pattern graph of a movable beam.
  • FIG. 3 shows a graph of the shaking of the movable beam moving in accordance with the speed pattern of F IG. 2.
  • FIG. 4 shows the speed pattern graph of the movable beam according to the method of the present invention.
  • FIG. 5 shows a graph of the shaking of the movable beam moving in accordance with the speed pattern of FIG. 4.
  • FIG. 6 shows one embodiment of an apparatus for practising the present invention.
  • FIG. 7 shows the speed graph of the movable beam moving in accordance with the system of FIG. 6.
  • FIG. 8 shows another embodiment ofan apparatus for practising the present invention.
  • FIG. 9 shows the speed graph of the movable beam moving in accordance with the system of FIG. 8.
  • the conventional heating furnace of the movable beam type has generally its floor consisting of the fixed beam and movable beams.
  • the structure for transporting steel slabs by the movable beam is of conventional type, as shown in FIG. I and FIG. 2, wherein the steel slab 5 charged in the heating furnace l is placed on the fixed beam 2 set on the supports 3.
  • the upper surface of the walking beam 4 passes the upper surface line (H.L.) of the fixed beam 2, and the steel slab is transferred onto the movable beam 4.
  • the upper surface of the movable beam 4 passes the upper surface line (H,.L.) of the fixed beam 2, and the steel slab 5 is transferred back to the fixed beam 2.
  • the movement cycle of the movable beam 4 is completed with the backward stroke from the point D to the starting point A.
  • the steel slab 5 is moved forward on the fixed beam over the distance BC; thus, by the periodic repetition of the cyclic movement of the movable beam 4, the steel slab 5 is moved forward step by step at a constant velocity (V) in the furnace, as shown in FIG. 2.
  • FIG. 3 shows one example of the shaking of the movable beam 4 moving in accordance with the speed pattern of FIG. 2, in degrees of the moving, direction (a) the side direction (b) and the vertical direction (c), respectively, of the upward, the forward, the downward and the backward strokes of the movable beam 4.
  • Another method for reducing the time of one cycle of the movable beam is to raise the ratio of the length of the forward stroke to the upward and the downward strokes, so as to reduce the loss of time due to the latter strokes in relation to that due to the former.
  • the length of the forward stroke is limited technically by the structure ofthe movable beam.
  • the present invention reduces to a minimum the shaking of the movable beam occurring when the steel slab is transferred, by providing a speed reduction midway on the upward and the downward strokes, which, however, does not hinder raising the speed prior and subsequent to the above speed reduction and on the other strokes, thereby making it possible to make the total time for one cycle of the movement the same as or shorter than that obtained by the movable beam of conventional type.
  • FIG. 6 shows one embodiment of an apparatus for practising the present invention by using an oil pressure unit as the driving device of the movable beam.
  • the variable discharging volume pump is used for controlling speed. Its mechanical structure consists of the speed setter 6 memorizing speed patterns, the voltage setter 7 for transforming the so made speed pattern into voltage, the servo-amplifier 8, the servo-valve 9, the servo-pump (variable discharging volume pump) 10, and the driving cylinder II.
  • This apparatus is so operated that the speed setter 6 which has memorized the speed patterns for start, medium operation, speed reduction and stop, issues an appropriate pattern selected therefrom to the voltage setter 7, which sends a voltage corresponding to the pattern through the servo-amplifier 8 to the servo-pump, 10, which operates the driving cylinder 11 through the servovalve 9.
  • FIG. 7 illustratesonly the upward stroke ofthe cyclic movement of the movable beam in the case of using the apparatus of FIG. 6.
  • the movable beam moves upward 0n the stroke AB. Its speed rises from the starting point A gradually up to the highest at the point a and then continues to the point m (which has been set appropriately) just before the upper surface of the movable beam approaches to the upper surface line (I-I.L.) of the fixed beam.
  • the limit switch LS set at the point in is turned on, to thus instruct the speed setter6 to give a signal to the movable beam to reduce the velocity thereof to a prescribed value.
  • the limit switch LS may be set on the cylinder rod or any other place on the driving cylinder 11.
  • the movable beam receives the steel slab from the fixed beam, and resumesits original speed at the point m in accordance with the pattern made by the speed setter 6. Having moved upward at the original maximum speed to the point b just before the prescribed stroke end, the limit switch LS works for speed reduction, and at the stroke end point B, the limit switch LS works to stop the upward stroke to be followed by the next forward stroke.
  • Such speed control can be preformed easily by the cooperation of the abovementioned limit switches L8,, L8, and LS; with the speed setter 6. Explanation of the operation of the downward stroke is omitted, as it is the same as that of the upward stroke.
  • FIG. 4 shows the stroke and speed pattern graph of one cycle of the movement of the movable beam.
  • FIG. 5 shows the graph of one measured case of the shaking of the operation of the movable beam according to the present invention, which illustrates that the shaking is far less than in the case of the operation of the movable beam of conventional type shown in FIG. 3, in the moving (a), the side (b) and the vertical directions (0) during all of the upward, the forward, the downward and the backward strokes.
  • the movement of the movable beam by the conventional method takes the longest time in the upward stroke and the downward stroke (that is, it is the slowest), in order to reduce such shock as mentioned above, and it takes the shortest time in the forward stroke and the backward stroke (that is, it is the fastest), to make up for the above slow movement.
  • the movements in the upward stroke, the forward stroke, the downward stroke and the backward stroke are made nearly constant in terms of time, and so can be driven by one cylinder, thus smoothing the movement of the movable beam and making easier its upward movement.
  • the structure for obtaining the midway speed reduction according to the present invention is not limited to the abovementioned, but any structure such as a reciprocal movement apparatus equipped with cams stand 12 shown in FIG. 8, m0ving in accordance with the speed pattern shown in FIG. 9 may be used.
  • Such cam stand 12 has the pattern of a speed predetermined at a7: and m 'b as shown in FIG. 9; and at 7175i" provides the profile of a midway speed reduction pattern.
  • the reciprocal movement apparatus 13 makes the wheel 14 move on the cam 12 making possible the midway speed reduction, as prescribed, during the upward and the downward strokes.
  • l5 denotes the reciprocal movement apparatus for the forward and the backward strokes. Explanation of the control of each stroke of the movement ofthe movable beam is omitted, as it is substantially the same as explained with regard to FIG. 6 and FIG. 7.
  • the means used for the midway speed reduction according to the present invention is not limited to the abovementioned.
  • the method of the present invention is applicable to any equipment of movable beam type, thus reducing to a minimum shaking and avoiding such irregular movement of the to-be-transported material such as the steel slab from the correct transfer course on the fixed beam. Therefore, the method of the present invention is greatly effective when such equipment as the heating furnace is made to have a larger size and capacity.
  • one cycle of the movement of the movable beam for moving and taking out the to-be-transported material requires the same length of time as or a shorter time than required by the conventional method of moving the movable beam, with the transferring speed of the to-be-transported material remaining the same as that of the conventional method.
  • the improvement comprising reducing the speed of said movable beams midway in the course of each of said elevating and lowering steps first before said movable beams raise said objects under transportation from said fixed beams and place said objects onto said fixed beams, respectively.

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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)
  • Rollers For Roller Conveyors For Transfer (AREA)
US853442A 1968-09-07 1969-08-27 Transportation method for use in equipment of movable beam type Expired - Lifetime US3658171A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6451568 1968-09-07

Publications (1)

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US3658171A true US3658171A (en) 1972-04-25

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US853442A Expired - Lifetime US3658171A (en) 1968-09-07 1969-08-27 Transportation method for use in equipment of movable beam type

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US (1) US3658171A (enExample)
BE (1) BE738451A (enExample)
CA (1) CA946320A (enExample)
DE (1) DE1944593C3 (enExample)
FR (1) FR2061595A1 (enExample)
GB (1) GB1286324A (enExample)
NL (1) NL6913581A (enExample)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3767064A (en) * 1972-06-20 1973-10-23 D Lutz Traveling walking beam conveyor
US3871534A (en) * 1972-07-28 1975-03-18 Max Hubert Bursk Walking beam conveyor
US3970191A (en) * 1974-02-11 1976-07-20 Wean United, Inc. Transfer apparatus
GB2173468B (en) * 1985-04-13 1989-11-15 Tidd Strongbox Ltd A walking beam mechanism
WO1992014662A1 (en) * 1991-02-19 1992-09-03 Hammond Theodore A Level gravity conveyor
US5228819A (en) * 1991-02-19 1993-07-20 Hammond Theodore A Level gravity conveyor
US5605427A (en) * 1993-07-06 1997-02-25 Hammond; Theodore A. Level gravity conveyor with gravity return of transfer units
US6074204A (en) * 1997-07-31 2000-06-13 Stein Heurtey Device for transferring products in plants for metallurgical treating of said products
US20050229748A1 (en) * 2004-03-31 2005-10-20 Regents Of The University Of Minnesota Linear hearth furnace system and methods regarding same
US20060184701A1 (en) * 2004-11-24 2006-08-17 Wan Sung Hur Position changing apparatus

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6602842U (de) * 1967-08-29 1969-06-26 Schloemann Ag Vorrichtung zum abkuehlen und querfoerdern von blechen
IT1112513B (it) * 1978-05-10 1986-01-20 Koppers Wistra Ofenbau Gmbh Procedimento per esercitare un forno a travi mobili
DE2830589C2 (de) * 1978-07-12 1985-04-18 Ibm Deutschland Gmbh, 7000 Stuttgart Durchlaufofen zum Prozessieren von Halbleiterplättchen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1921956A (en) * 1931-10-05 1933-08-08 Harry F Vickers Control for heat-treating apparatus
DE627777C (de) * 1934-01-18 1936-03-25 Jean Laduree Foerdervorrichtung, bestehend aus nebeneinanderliegenden, in der Laengsrichtung unter Zugspannung gehaltenen Foerderleisten, die gleichzeitig eine hin und her sowie eineauf und ab gehende Bewegung erhalten
US2888131A (en) * 1954-07-27 1959-05-26 Owens Illinois Glass Co Article transfer mechanism
US3416646A (en) * 1965-09-03 1968-12-17 Boos Hermann Process for cooling and transverse conveyance of metal sheets

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1741516A (en) * 1928-01-23 1929-12-31 Hevi Duty Electric Co Conveyer
DE831518C (de) * 1948-07-17 1952-02-14 Ferdinando Battistin Antrieb fuer Foerderer mit Schrittbewegung
BE519778A (enExample) * 1952-05-14
DE1286452B (de) * 1966-09-08 1969-01-02 Brockmann & Bundt Hubbalkensystem, insbesondere fuer Hubbalkenoefen
DE1533980A1 (de) * 1967-03-18 1970-02-12 Koppers Wistra Ofenbau Gmbh Hubbalkenofen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1921956A (en) * 1931-10-05 1933-08-08 Harry F Vickers Control for heat-treating apparatus
DE627777C (de) * 1934-01-18 1936-03-25 Jean Laduree Foerdervorrichtung, bestehend aus nebeneinanderliegenden, in der Laengsrichtung unter Zugspannung gehaltenen Foerderleisten, die gleichzeitig eine hin und her sowie eineauf und ab gehende Bewegung erhalten
US2888131A (en) * 1954-07-27 1959-05-26 Owens Illinois Glass Co Article transfer mechanism
US3416646A (en) * 1965-09-03 1968-12-17 Boos Hermann Process for cooling and transverse conveyance of metal sheets

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3767064A (en) * 1972-06-20 1973-10-23 D Lutz Traveling walking beam conveyor
US3871534A (en) * 1972-07-28 1975-03-18 Max Hubert Bursk Walking beam conveyor
US3970191A (en) * 1974-02-11 1976-07-20 Wean United, Inc. Transfer apparatus
GB2173468B (en) * 1985-04-13 1989-11-15 Tidd Strongbox Ltd A walking beam mechanism
WO1992014662A1 (en) * 1991-02-19 1992-09-03 Hammond Theodore A Level gravity conveyor
US5228819A (en) * 1991-02-19 1993-07-20 Hammond Theodore A Level gravity conveyor
US5605427A (en) * 1993-07-06 1997-02-25 Hammond; Theodore A. Level gravity conveyor with gravity return of transfer units
US6074204A (en) * 1997-07-31 2000-06-13 Stein Heurtey Device for transferring products in plants for metallurgical treating of said products
US20050229748A1 (en) * 2004-03-31 2005-10-20 Regents Of The University Of Minnesota Linear hearth furnace system and methods regarding same
US7413592B2 (en) 2004-03-31 2008-08-19 Nu-Iron Technology, Llc Linear hearth furnace system and methods regarding same
US20080302211A1 (en) * 2004-03-31 2008-12-11 Nu-Iron Technology, Llc Linear hearth furnace system and methods regarding same
US7666249B2 (en) 2004-03-31 2010-02-23 Nu-Iron Technology, Llc Linear hearth furnace system and methods regarding same
US20060184701A1 (en) * 2004-11-24 2006-08-17 Wan Sung Hur Position changing apparatus

Also Published As

Publication number Publication date
CA946320A (en) 1974-04-30
GB1286324A (en) 1972-08-23
DE1944593B2 (de) 1972-07-06
FR2061595A1 (enExample) 1971-06-25
NL6913581A (enExample) 1970-03-10
DE1944593C3 (de) 1973-02-01
DE1944593A1 (de) 1970-03-26
BE738451A (enExample) 1970-02-16

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