US3700122A - Pusher-type furnace - Google Patents

Pusher-type furnace Download PDF

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Publication number
US3700122A
US3700122A US77095A US3700122DA US3700122A US 3700122 A US3700122 A US 3700122A US 77095 A US77095 A US 77095A US 3700122D A US3700122D A US 3700122DA US 3700122 A US3700122 A US 3700122A
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US
United States
Prior art keywords
pusher
workpieces
furnace
feed
main
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
Application number
US77095A
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English (en)
Inventor
Theodor Josef Sevenich
Wolfgang Fabian
Klaus Kuhn
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.)
Maschinen und Werkzeugbau GmbH
Original Assignee
Masch & Werkzeugbau Gmbh
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Publication of US3700122A publication Critical patent/US3700122A/en
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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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/04—Ram or pusher apparatus
    • 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
    • F27B9/38—Arrangements of devices for charging
    • 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
    • F27B9/22—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 on rails, e.g. under the action of scrapers or pushers
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
    • F27D2003/0042—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities comprising roller trains
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
    • F27M2001/00—Composition, conformation or state of the charge
    • F27M2001/15—Composition, conformation or state of the charge characterised by the form of the articles
    • F27M2001/1539—Metallic articles
    • F27M2001/1547—Elongated articles, e.g. beams, rails
    • F27M2001/1552—Billets, slabs

Definitions

  • a pusher-type furnace for the heating of metal ingots, blooms, billets or bars to rolling temperature is provided at its inlet side with a billet-receiving platform or table upon which a pusher assembles one or more billets for advance into the furnace by a main pusher, the latter serving simultaneously to displace the entire array of workpieces and advance one or more of the latter out of the furnace.
  • a pusher-type furnace generally comprises an elongated furnace chamber provided with means, e. g. a pair of rails for carrying billets, bars, blocks, blooms, ingots and like workpieces through a space which is heated by combustion or by regenerative-heated gases, for heattreatment of the workpieces and especially, the heating thereof to rolling temperature.
  • means e. g. a pair of rails for carrying billets, bars, blocks, blooms, ingots and like workpieces through a space which is heated by combustion or by regenerative-heated gases, for heattreatment of the workpieces and especially, the heating thereof to rolling temperature.
  • hot gases contact the workpiece both from above and from below and the relatively hot workpiece discharged from the furnace may be directly subjected to rolling or other metal deformation.
  • a pusher-type furnace is provided at the charging or inlet end of the furnace with a ram of like pusher member designed to advance a fresh workpiece into the furnace through a door or window thereof, to simultaneously displace all of the workpieces within the furnace through an increment equal to the width of the introduced workpiece, and to shift a workpiece at the discharge end of the furnace out of the outlet door.
  • the workpieces within the furnace lie in laterally contiguous (abutting) relationship and the furnaces operate more or less periodically with the period determined by the length of the furnace, the number of workpieces to be accommodated therein, the width 'of the workpiece and the residence time of the workpiece within the furnace that is considered desirable.
  • Such furnaces may be provided with supply means, e.g. a roller conveyor upon which the workpieces are delivered to the charging apparatus and with discharge means, e.g. a roller conveyor, upon which the emerging workpieces are carried to a further processing station, e.g. a rolling mill.
  • supply means e.g. a roller conveyor upon which the workpieces are delivered to the charging apparatus
  • discharge means e.g. a roller conveyor
  • the most convenient method of operating the furnace makes use of a furnace chamber or path having a width which is greater than the maximum length of the billet or other workpiece to be treated and inserts the workpieces laterally, the workpieces arriving in the longitudinal direction upon the roller conveyor and being shifted transversely to this direction into the furnace.
  • the workpieces are then advanced periodically or in increments through the furnace in a direction transverse to their length.
  • Another object of the invention is the provision of an improved method of operating a pusher-type furnace and especially a pusher-type furnace adapted to be used in conjunction with similar pusher-type furnaces in a parallel array thereof.
  • Yet another object of the instant invention is to provide an improved method of operating a pusher-type furnace installation which permits accommodation of individual furnace programs to workpieces of different width without inconveniencing the operation of the entire system.
  • the invention is based upon the discovery that, with existing installations of the character described, it is difficult, if not impossible to adjust the program of a particular furnace constituting part of an array of pusher-type furnaces adapted to be simultaneously operated to discharge onto a common conveyor arrangement. It will be readily understood that a change in the program is called for when any of the aforedescribed parameters is to be changed. For example, when narrow billets are to be heated, the periodic feed timing of the furnace must be adjusted to advance the workpieces more rapidly through the furnace and vice versa. It follows that, with the existing systems, it was not possible to vary the width of the workpieces supplied at one of the furnaces to the exclusion of the others. Hence the versatility of the entire system was limited.
  • a pusher-type furnace which extends longitudinally between an inlet and an outlet and provided with means for supporting a succession of workpieces between the inlet and the outlet in contiguous relationship, if formed adjacent its inlet with a collecting table juxtaposed with or adjacent a feed conveyor adapted to carry a succession of workpieces to the furnace.
  • the feed-pusher means (auxiliary ram) is longitudinally reciprocable to displace a plurality of such workpieces generally transversely to the direction in which they are delivered, onto the collecting table for temporary storage thereon, during a stroke of the main pusher means which delivers a previous workpiece, or group of workpieces, to the furnace and thereby displaces all of the workpieces within the furnace through a corresponding distance in the direction of the outlet.
  • the conveyor means may be a gravity roller conveyor upon which the elongated workpieces are delivered in a direction parallel to their major dimensions and transversely to the longitudinal direction of the furnace.
  • the direction of reciprocation of the main pusher means andof the feed pusher means is, of course, transverse to the major dimensions of the workpieces but parallel to the longitudinal direction of the furnace, i.e.
  • the main pusher means is operated at a constant rate regardless of the program of the furnace while the feed pusher means'is operated at a rate determined by the I width of the workpieces to be heat-treated.
  • the feed pusher means may deliver single workpieces to the collecting table for each stroke of the main pusher means when such workpieces have the maximum width which may be accommodated, or may be operated at a frequency or rate which exceeds that of the main pusher means to accommodate a plurality of workpieces upon the collecting table for each stroke of the main pusher means. This latter mode of operation is used when the width of the workpieces is less than the maximum width as will be apparent hereinafter.
  • main pusher means is used herein to designate the pusher arrangement commonly provided at such furnaces in prior art systems and generally includes a drive speed-reducing gearing and one or more pusher bars reciprocated by such gearing.
  • the drive may be independent from or coupled with the drives of similar furnace installations.
  • auxiliary ram or feed-pusher means additionally provided in accordance with the principles of the the main pusheris reduced in accordance with the principles of this invention, additional place is available for storage of billets, etc.
  • FIG. 1 is a vertical cross section through a pushertype furnace installation embodying the present inventlOn ;j'-
  • FIG. 2 is a plan view thereof
  • FIG. 3 is a detail view of a pusher-ram'for use in the installation of FIGS. 1 and 2; "and FIG. 4A'-- 4H are diagrammatic side elevational views illustrative of various phases of the invention.
  • the furnace installation which may comprise a plurality of parallel pusher-type furnaces only one of which has been illustrated, basically includes the pusher-type furnace 1 having a preheating chamber 1a, a main heating chamber 1b and a temperature-equalizing chamber 10 horizontally spaced along a linear transport path 1d for a succession of bars, billets, blooms or other prismatic workpieces of iron, steel or other metal .to be rolled.
  • the workpieces are generally shown at'3 and have a length L and a width w or W as illustrated in FIG. 2. Some of the billets may, of course, be wider than others as represented in FIG. 1.
  • the support 1d maybe concentrated by a pair of rails extendpresent invention, preferably includes an ,independently operable second drive means, e.g. a motor, speed-reducing. gearing and control means, for reciprocating the pusher bars of the feed-pusher means.
  • the second drive means may be included in the same structure as the drive means for the main pusher bars or in a separately provided auxiliary structure. Since only individual workpieces need be displaced by the feed-pusher means, the drive for the latter and the pusher bars themselves may be diminished to withstand substantially less stress than is applied to the main pusher means. Furthermore, since the main-pusher means does not have to shift the workpieces onto the table, the stroke thereof can be reduced and the main pusher operated at a slow speed convenient to the optimal efficiency of the drive means.
  • the system has been found to be particularly advantageous when the furnace installation is used as part of a broad-band or strip rolling mill for heating the billets prior to rolling.
  • the improved feed arrangement for the furnace installation may have its. program adjusted in accordance with the widths of the workpieces to be processed without negative influence upon the remainder of the processing line. Since the stroke of ing across heating chambers in the manner described and illustratedin the aforementioned US. patents.
  • an inlet door 1e beyond which an accumulating storage or collecting platform or table 5 extends horizontally in alignment with the upper surface of the workpiece supports within the furnace.
  • the table 5 has a width D in excess of the maximum width W of a workpiece to be accommodated by the furnace and equal at least to the maximum stroke of the main pusher-ram 7 as will be apparent hereinafter.
  • the exhaust-gas outlet is represented at 1 f and a furnace chamber is shown at 1g.
  • Each of the pusher-type furnaces 1 is disposed between .a pair of conveyors generally indicated at 4 and 12 and respectively constituting the inlet and discharge conveyors, respectively.
  • the roller conveyors are inclined downwardly in the direction of advance of the workpieces as described at pages 10 74 ff. of MARKs MECHANICAL ENGINEERS Handbook, McGraw Hill Book Co., New York 1958.
  • the conveyors 4 and 12 run along the entire bank of pusher-type furnaces in the usual manner and define a support plane P which is identical with that of the upper surface of the table 5.
  • an outlet opening 1h is provided, together with a support table lj, the upper surface of which is coplanar with the uppermost portions of the rollers 12 of the discharge conveyor.
  • a main ram having a'pair of pusher bars 6 which may be reciprocated in the longitudinal direction of the furnace l, i.e. in the direction of arrow D, but which lie in a horizontal plane above the plane P of the table 5.
  • swingable shoes 7 adapted to engage the trailing edges of the workpieces and advance them into the furnace. A suitable arrangement of this shoe is shown in FIG.
  • the bars 6 may be constituted as racks 6a engageable by pinions 6b coupled with an adjustable drive 11 which may be provided with a heavy-duty motor by speed-reducing gear with the pusher bar to deliver the relatively high torque necessary to advance all of the workpieces within the furnace.
  • the drive 11 is, of course, shown only diagrammatically and may be constituted by the common drive for the main pusher members of all the furnaces of the respective bank. 7
  • the free ends of the bars 6 are bifurcated with the pawl-like flap 7 articulated in a slot 6c between the arms 6d of the bifurcation upon a pin 6e.
  • the bar 6 is retracted (arrow E) and the pawl 7 engages the forward or leading edge of a laterally shiftable workpiece as represented at 3' in FIG. 3, the pawl 7 swings in the counterclockwise sense to clear the workpiece and returns into its dot-dash line position in the clockwise sense only after the workpiece has been cleared.
  • the trailing edge 7 of the pawl is designed to abut floor 6f of the bifurcation during the following forward displacement of the bar 6 when the leading edge 7" of the pawl engages the trailing edge 3 of the workpiece 3. Upon such abutment, the pawl cannot swing in the clockwise sense and hence the workpiece is entrained along with the pawl.
  • a similar self-clearing pawl is provided at the free end of each of the spaced-apart rams 6.
  • a second bar of rams 9 is provided between the rams 6 and constitute the auxiliary pusher means of the present invention, designed to advance the workpieces from the conveyor 4 onto the table 5 as will be apparent hereinafter.
  • the stroke of the main pusher means may, of course, be reduced of the stroke of auxiliary pusher means.
  • the auxiliary pusher means 9 comprises a pair of pusher bars or rams, spaced transversely across the mouth of the furnace and substantially coplanar with the rams 6 although a vertical offset has been represented in FIGS. 4A 4H for clarity of illustration. At the free ends, the bars 9 are provided with swingable pawls 10 as previously discussed.
  • the drive means for the bar 9, may include a rack and pinion arrangement of the type represented in FIG. 3, and makes use of a motor 8 and appropriate speed-reducing gearing.
  • the speed-reducing gearing, rack and pinion arrangements and control means are provided within the housing shown at 2, the latter reference numeral being used hereinafter to designate the workpiece-feed means generally.
  • FIGS. 4A 4H The operation of the system will be understood more readily from FIGS. 4A 4H in which a typical sequence is shown.
  • a workpiece arriving upon the gravity roller conveyor 4 generally will have a maximum width Wand is shiftable to the right onto the table 5 by the rams 9 and is thereafter advanced into the furnace by the rams 6 until, of course, the furnace is full.
  • the workpieces are heated to rolling temperature so that, when a further workpiece is pushed into the furnace, a workpiece of corresponding width is pushed out of the furnace onto the conveyor 12 and passes by gravity in the'direction of arrow C to the rolling mill.
  • the width of theworkpiece is reduced to the width w, which preferably constitutes a simple fraction of the width W, i.e. w (l/n) X W, where n is an integer
  • n workpieces are accumulated upon the table 5 and are advancedsimultaneously into the furnace by the rams 6.
  • the rams 9 may operate at a frequency f n X F, where F is frequency of operation of the main pusher rams 6.
  • the auxiliary pusher means 9, 10 shifts to the right (FIGS. 1 and 2) to displace the workpiece from the gravity roller conveyor 4 along which the workpiece travels in the longitudinal direction A.
  • the workpiece is thereby moved transversely onto the table 5 whereupon the main pusher means 6, 7 engages the trailing edge of the workpiece and moves it to the right into the furnace by a distance approximately equal to W.
  • the drive 8 is operated to effect two strokes of the feed pusher 9 as best seen in FIGS. 4A 4H.
  • the main pusher 6 is advancing the workpiece 3 in the direction of arrow B into the furnace from the table 5 as previously described.
  • the pusher 9 is operated with a smaller stroke in the same direction to advance a workpiece 3c of smaller width in the direction of arrow B onto the table.
  • a pusher-type furnace installation comprising:
  • a pusher-type furnace having an inlet at one end and I an outlet at another end thereof and provided with V means for supporting a succession of workpieces in contiguous relationship within said furnace; a collecting table ahead of said inlet; feed-pusher means for advancing a plurality of workpieces,
  • main pusher means for simultaneously advancing the workpieces onto said table into said furnace while shifting the workpieces therein a corresponding distance said outlet
  • said main pusher means comprising: a main pusher bar reciprocable in saiddirection,
  • first drive means operably'connected with said main pusher'bar, w e v a pivotal pawl on said main pusher bar adapted to I ride over workpieces onsaid table and to lock upon advance of said ma-pusher bar in the direction of said inlet;
  • said feed-pusher means including: 7 a feed-pusher bar reciprocable insaid direction, .second drive means operableindependently of said first drive means and connected to said feed-pusher bar for reciprocating same during reciprocation of said main pusher bar, and a pivotal pawl on said feed-pusher bar adapted to ride over workpieces upon displacement of said feed-pusher bar away'from said inlet and to engage the workpieces upon advance of the feed-pusher bar in the direction of said inlet.
  • said 4. The installation defined in claim 1 wherein a gravity roller conveyor is provided adjacent said table for r delivering said workpiec es t o sa id feed-pusher means.

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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)
  • Discharge Of Articles From Conveyors (AREA)
  • Control Of Metal Rolling (AREA)
US77095A 1969-10-02 1970-10-01 Pusher-type furnace Expired - Lifetime US3700122A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1949747 1969-10-02

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US3700122A true US3700122A (en) 1972-10-24

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Application Number Title Priority Date Filing Date
US77095A Expired - Lifetime US3700122A (en) 1969-10-02 1970-10-01 Pusher-type furnace

Country Status (7)

Country Link
US (1) US3700122A (fr)
JP (1) JPS5031849B1 (fr)
BE (1) BE756961A (fr)
CA (1) CA934154A (fr)
DE (1) DE1949747B1 (fr)
FR (1) FR2064863A5 (fr)
GB (1) GB1324695A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4826659A (en) * 1986-09-03 1989-05-02 Fuji Film Co., Ltd. Apparatus for feed-in and ejection of chemical analysis slide
US5645418A (en) * 1996-02-20 1997-07-08 Tippins Incorporated Pusher furnace drop-out conveyor
US20070128568A1 (en) * 2005-12-07 2007-06-07 Ajax Tocco Magnethermic Corporation Method and apparatus to provide continuous movement through a furnace
KR20140071390A (ko) * 2011-08-29 2014-06-11 유겐가이샤 요코타테쿠니카 반송 장치

Families Citing this family (5)

* 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
JPS56129405A (en) * 1980-03-14 1981-10-09 Matsushita Electric Ind Co Ltd Angle list for antenna
JPS56129407A (en) * 1980-03-14 1981-10-09 Matsushita Electric Ind Co Ltd Antenna
JPS56129406A (en) * 1980-03-14 1981-10-09 Matsushita Electric Ind Co Ltd Antenna
JPS5774512U (fr) * 1980-10-24 1982-05-08

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE639848C (de) * 1935-07-21 1936-12-14 Demag Akt Ges Vorrichtung zum paketweisen Einbringen von einzeln vorgebrachten Metallbloecken in einen Waermeofen
DE1205574B (de) * 1961-10-28 1965-11-25 Ofag Ofenbau Ges M B H Blockdruecker fuer Stossoefen mit Gleitschienen fuer die Bloecke
US3490621A (en) * 1968-01-16 1970-01-20 Westinghouse Electric Corp Workpiece distribution system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE639848C (de) * 1935-07-21 1936-12-14 Demag Akt Ges Vorrichtung zum paketweisen Einbringen von einzeln vorgebrachten Metallbloecken in einen Waermeofen
DE1205574B (de) * 1961-10-28 1965-11-25 Ofag Ofenbau Ges M B H Blockdruecker fuer Stossoefen mit Gleitschienen fuer die Bloecke
US3490621A (en) * 1968-01-16 1970-01-20 Westinghouse Electric Corp Workpiece distribution system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4826659A (en) * 1986-09-03 1989-05-02 Fuji Film Co., Ltd. Apparatus for feed-in and ejection of chemical analysis slide
US5645418A (en) * 1996-02-20 1997-07-08 Tippins Incorporated Pusher furnace drop-out conveyor
WO1997030319A1 (fr) * 1996-02-20 1997-08-21 Tippins Incorporated Convoyeur de sortie descendant pour four a poussoir
US5836759A (en) * 1996-02-20 1998-11-17 Tippins Incorporated Pusher furnace drop-out conveyor
US20070128568A1 (en) * 2005-12-07 2007-06-07 Ajax Tocco Magnethermic Corporation Method and apparatus to provide continuous movement through a furnace
US7507087B2 (en) * 2005-12-07 2009-03-24 Ajax Tocco Manethermic Corporation Method and apparatus to provide continuous movement through a furnace
KR20140071390A (ko) * 2011-08-29 2014-06-11 유겐가이샤 요코타테쿠니카 반송 장치
US20140231223A1 (en) * 2011-08-29 2014-08-21 Yokota Technica Limited Company Conveyor
US9193529B2 (en) * 2011-08-29 2015-11-24 Yokota Technica Limited Company Conveyor

Also Published As

Publication number Publication date
FR2064863A5 (fr) 1971-07-23
JPS5031849B1 (fr) 1975-10-15
DE1949747B1 (de) 1971-05-27
BE756961A (fr) 1971-03-16
GB1324695A (en) 1973-07-25
CA934154A (en) 1973-09-25

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