EP0398104A1 - Durchlaufofen - Google Patents

Durchlaufofen Download PDF

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Publication number
EP0398104A1
EP0398104A1 EP90108506A EP90108506A EP0398104A1 EP 0398104 A1 EP0398104 A1 EP 0398104A1 EP 90108506 A EP90108506 A EP 90108506A EP 90108506 A EP90108506 A EP 90108506A EP 0398104 A1 EP0398104 A1 EP 0398104A1
Authority
EP
European Patent Office
Prior art keywords
furnace
flap
opening
door
protective gas
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.)
Ceased
Application number
EP90108506A
Other languages
German (de)
English (en)
French (fr)
Inventor
Peter Karojet
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.)
MAHLER DIENSTLEISTUNGS-GMBH LOETEN-HAERTEN-ANLAGENBAU
Mahler Dienstleistungs GmbH Loeten Haerten Anlagenbau
Original Assignee
MAHLER DIENSTLEISTUNGS-GMBH LOETEN-HAERTEN-ANLAGENBAU
Mahler Dienstleistungs GmbH Loeten Haerten Anlagenbau
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MAHLER DIENSTLEISTUNGS-GMBH LOETEN-HAERTEN-ANLAGENBAU, Mahler Dienstleistungs GmbH Loeten Haerten Anlagenbau filed Critical MAHLER DIENSTLEISTUNGS-GMBH LOETEN-HAERTEN-ANLAGENBAU
Publication of EP0398104A1 publication Critical patent/EP0398104A1/de
Ceased legal-status Critical Current

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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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids or removable covers
    • 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
    • F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
    • F27B9/028—Multi-chamber type furnaces
    • 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
    • F27B9/04—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity adapted for treating the charge in vacuum or special atmosphere
    • F27B9/045—Furnaces with controlled atmosphere
    • 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
    • F27D7/00—Forming, maintaining or circulating atmospheres in heating chambers
    • F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers

Definitions

  • the invention relates to a door for opening and closing an opening of a continuous furnace for the heat treatment of workpieces under protective gas, the opening being used for the inlet or outlet of workpieces which are moved through the furnace by a conveying device, and wherein the protective gas from the Oven emerges.
  • the end openings of the continuous furnace for letting in or letting out workpieces are closed by a sliding door, which is usually mounted vertically or at a slight incline and is displaceable in height at the respective opening.
  • the door is then moved upwards so far that the workpieces to be introduced into or transported out of the furnace can pass through just below the lower edge of the door that is pushed up.
  • the shielding gas emerges on both sides from the inside of the furnace towards the outside under the door.
  • the hot protective gas which has a lower specific weight than the ambient air due to its composition (eg hydrogen) or due to thermal expansion, flows in the essentially in the upper area of the opening between the lower edge of the raised door and the conveyor belt from the oven.
  • the air in the furnace can mix with the protective gas, which usually contains hydrogen, so that detonating gas explosions can occur in the furnace, which can damage it considerably.
  • the air introduced into the furnace or the atmospheric oxygen contained therein, in particular on the part of the heating zone can ensure that oxidation processes take place on the workpieces. Once such oxidation processes have taken place, they can no longer be eliminated even in a later zone in which the protective gas atmosphere is fully effective. Even a higher flow rate of the protective gas in the furnace, which would also be associated with a considerably higher consumption of the protective gas, cannot prevent the wedge reaching deep into the furnace.
  • DE-PS 287 400 and DE-PS 265 858 doors for closing ovens which can be pivoted about an approximately horizontal axis.
  • these ovens are not continuous ovens in which a protective gas can escape from the inside of the oven through the door.
  • the doors serve to seal the furnace opening tightly.
  • the object of the present invention is to provide a door of the type mentioned at the outset, which counteracts the entry of atmospheric oxygen into the furnace in the open state.
  • the object is achieved in that the door is designed as a flap which can be pivoted about an axis which runs transversely to the direction of flow and is arranged above the opening, side walls being provided on both sides of the flap and covering the side regions of the flap when the flap is open.
  • the lower edge of the door designed as a swivel flap moves away from the end opening of the furnace during the opening movement.
  • the flow of the protective gas out of the furnace from the end opening of the furnace up to the distance that the lower edge of the swivel flap has extended from this opening is virtually pulled out of the actual furnace, as a result of which the air wedge of possibly entering air, from the end of the furnace is pushed away.
  • the air wedge as such is considerably shorter, ie it can be prevented that the tip of the air wedge reaching into the interior does not reach the actual opening at the end of the furnace, and thus does not come into contact with the hot furnace walls comes so that the air is not heated much, as with an air wedge in the prior art, which extends into the actual furnace space. As a result, the oxidation activity of this colder air is lower. On the inlet side, this also has the advantage that the cold workpieces cannot react with the cold, cold air wedge, so that no oxidation processes can take place in the transition phase of entering the furnace. When the workpiece has entered the actual furnace area and is heated, it is no longer in contact with the air wedge.
  • the side walls can be attached directly to the flap or can be arranged standing directly on both sides of the flap in its pivoting area.
  • the side walls are designed such that when the flap is completely open parallel to the conveying plane, the entire side area is covered on both sides of the flap.
  • This measure has the advantage that when the door is fully open, the side areas are completely covered, so that ultimately the furnace housing is extended by the length or height of the door. This can be achieved that when the door is open, the furnace channel can be extended by about 1 m on both sides, whereby the air wedge is then pushed away by about 1 m from the actual furnace opening and no air quantities can enter the actual furnace area.
  • the side walls are designed as lateral folds of the flap.
  • This measure has the advantage that a particularly structurally simple flap is formed, which can be produced from a single piece, in which a central region forms the part of the flap which covers the furnace cross section, this central region then on both sides via the folds or Edges merges into the side walls.
  • the flap is connected via a laterally arranged linkage and can be pivoted through it.
  • This measure has the advantage that the door according to the invention can be opened by a simple and robust mechanism without changing the flow conditions when opening or closing the flap, so that it is ensured that the opening mechanism does not cause any turbulence, for example for a Can cause air to enter the oven.
  • the flap can be pivoted via the linkage in a certain opening height, in particular just permitting the workpieces, and can be held in this position.
  • This measure has the advantage that the flap can be held in a respective position by means of structurally particularly simple measures, which in particular allows the entry or exit of workpieces, as a result of which the protective gas flowing out, which has a certain outflow height below the outer edge of the flap, the smallest possible air wedge is available.
  • This dependence on the opening height of the door can also be adjusted depending on the workpiece height, so that the door is held firmly in the open position, which ensures the greatest possible retention of atmospheric oxygen from the outside.
  • the pivoting principle of the door flap according to the invention also ensures that the further the door is pivoted away from the furnace opening, the more the air wedge is pushed away from the opening, and thus ensures that the greater the possibility of entry due to the larger opening is compensated for by oxygen, so that it is consistently ensured that no atmospheric oxygen enters the actual protective gas interior.
  • this wedge becomes ever larger with increasing door opening height, so that there is a particularly high risk of oxidation in the case of high, large, and therefore usually also expensive, workpieces.
  • a furnace 10 shown in FIG. 1 has a conveying device 12 for conveying workpieces 13, 14 through the furnace 10, as is shown by an arrow 15.
  • the conveying device 12 consists of an endlessly circulating metal chain link belt, the surface of which the workpieces 13, 14 rest on forms a conveying plane 17.
  • a housing 16 of the furnace 10 has an end opening 18 which, in the illustration in FIG. 1, represents an inlet opening of a heating zone 26 of the furnace 10.
  • a combustion chamber 22 When viewed in the direction of strip travel 15, before the opening 18, a combustion chamber 22 is arranged, the upper end of which is provided with a trigger 24.
  • protective gas 28 which emerges from the interior or the heating zone 26 of the furnace housing 16, burns with the formation of flames 30 with the atmospheric oxygen from the surroundings, as a result of which a flame curtain is created.
  • the combustion gases then exit through the hood 24.
  • a door 32 is attached to the upper end edge 20 of the furnace housing 16, which at the same time forms the upper boundary of the opening 18.
  • the door 32 consists of a flap 36 which can be pivoted about an axis 34 extending transversely to the conveying direction 15, as is indicated by a double arrow 35.
  • the flap 36 has a length such that in the closed state, i.e. 1 in a vertical orientation, the entire opening 18 closes.
  • the side walls are designed as separate sheets standing next to the door 32, which are arranged directly next to the lateral longitudinal edges of the flap 36.
  • the outer transverse edge 37 of the flap 36 opposite the axis 34 has moved away from the end edge 20 of the furnace which surrounds the opening 18 by an amount.
  • an air wedge 38 is formed below the outflowing protective gas flow, which extends wedge-shaped, with the tip first, in the direction of the interior or, in the exemplary embodiment shown in FIG. 1, in the direction of the heating zone 26.
  • the tip of the wedge 38 comes to lie just about at the level of the opening 18, ie no atmospheric oxygen occurs the actual heating zone 26 of the furnace 10, which begins with the end edge 20 of the furnace.
  • a workpiece 14 that has already been introduced into the heating zone 26 by means of the conveying device 12 is no longer in contact with the air wedge 38.
  • the workpiece 14 that is already heating up in the heating zone 26 can therefore not be oxidized by the atmospheric oxygen.
  • an oven 10 ' is shown in Fig. 2, which corresponds in its dimensions to the oven 10 of Fig. 1, but which is provided with a door 40, as is known from the prior art .
  • the door 40 is designed as a sliding door, which is arranged at a slight inclination and is displaceable in its longitudinal direction, as is shown by a double arrow 41 in FIG. 2.
  • the sliding door 40 is in such a displacement position that approximately half the height of the inlet opening 18 is released, so that workpieces 13, 14, which are identical to the workpieces 13 and 14 in the illustration of FIG. 1, just below the sliding door 40 'can enter the oven 10'.
  • the protective gas 28 emerges below the lower edge of the sliding door 40 and burns to form flames 30.
  • an air wedge 38 ' has been formed, which is substantially longer than the air wedge 38' of FIG located very far into the interior of the heating zone of the furnace 10 '.
  • the air wedge 38 ' extends so far into the furnace that it is still in contact with the workpiece 14 that a considerable distance has already been transported in the heating zone, thus has already been heated, so that an oxidation process on the workpiece 14 can take place under these conditions .
  • a door 32 which serves as an inlet door for a heating zone 26. It is of course possible, as seen in the direction of flow 15, at the opposite end of the furnace 10, at the outlet opening arranged in mirror image accordingly, to also arrange the door 32. Flow conditions comparable to those in FIG. 1 also prevail at the outlet door, only the transport direction of the workpieces being reversed.
  • a furnace 50 is provided at its outlet end, which is formed by an opening 53, with a door 52 according to the invention.
  • the door 52 likewise has a flap 55 which can be pivoted about an axis 54 running transversely to the conveying direction 65 of the transport device 62.
  • the axis 54 is also arranged in the region of the upper edge or the upper end of the opening 53.
  • the flap 55 is provided on both sides with side walls in the form of lateral folds 56, which in the exemplary embodiment of FIG. 3 have the shape of a quarter of a circle.
  • the rear bend, which is concealed by the side bend 56 in the side view of FIG. 3, is embodied as a mirror image of the latter.
  • the flap 55 is shown in its almost fully unfolded state, i.e. the flap 55 runs approximately parallel to the conveying plane 67 of the conveying device 62 and is at a distance therefrom approximately at the height of the outlet opening 53 of the furnace 50.
  • a workpiece 63 which is transported out of the furnace 50 by the conveyor device 62, is still partially covered on the upper side by the flap 55 and also by the lateral folds 56.
  • the door 52 acts more or less like an extension of the furnace 50.
  • the protective gas emerges below the edge of the flap 55 that is distant from the opening 53 and burns in a combustion chamber 72 to form a flame curtain 73.
  • the oven 50 is on the opposite side, i.e. So on the inlet side with a corresponding mirror image arranged door 52 or flap 55 with side bends 56.
  • the lateral fold 56 is connected to a linkage 58 arranged laterally therefrom, which is connected to a servomotor, not shown here.
  • a linkage 58 By moving the linkage 58, the flap 55 or the door 52 can be moved, the door 52 'being shown in a completely closed state in FIG. 3 by a broken line, in which the linkage 58' then assumes the position shown.
  • a further embodiment of a formation of a lateral fold 66 is indicated by dash-dotted lines, i.e. the side folds take on an approximately rectangular contour.
  • a workpiece 63 entering or leaving the furnace is shielded from the door 52 on both sides and cover side with the door 52 fully open, that is to say with the flap 55 pivoted approximately horizontally, virtually the furnace space by the length of the flap 55 extended at both opposite ends. This prevents the entry of atmospheric oxygen from the outside into the actual furnace space in a particularly effective manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Tunnel Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Furnace Details (AREA)
EP90108506A 1989-05-18 1990-05-07 Durchlaufofen Ceased EP0398104A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3916183 1989-05-18
DE19893916183 DE3916183A1 (de) 1989-05-18 1989-05-18 Tuer zum oeffnen und verschliessen einer oeffnung eines durchlaufofens

Publications (1)

Publication Number Publication Date
EP0398104A1 true EP0398104A1 (de) 1990-11-22

Family

ID=6380882

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90108506A Ceased EP0398104A1 (de) 1989-05-18 1990-05-07 Durchlaufofen

Country Status (3)

Country Link
EP (1) EP0398104A1 (enrdf_load_stackoverflow)
JP (1) JPH02309186A (enrdf_load_stackoverflow)
DE (1) DE3916183A1 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100502237B1 (ko) * 2000-06-05 2005-07-20 주식회사 포스코 수평 고온 소둔로용 도어장치
KR100733368B1 (ko) * 2006-10-16 2007-06-28 주식회사 포스코 고온 소둔로의 실링장치

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2078094A5 (enrdf_load_stackoverflow) * 1970-02-02 1971-11-05 Allegheny Ludlum Ind Inc
FR2154803A1 (enrdf_load_stackoverflow) * 1971-09-28 1973-05-11 Librawerk Pelz & Nagel Kg
DE2601658A1 (de) * 1976-01-17 1977-07-28 J F Mahler Fa Kuehlvorrichtung fuer einen durchlaufofen
DE3541873C1 (en) * 1985-11-27 1987-01-02 Fuchs Systemtechnik Gmbh Furnace vessel of an electric arc furnace

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE265858C (enrdf_load_stackoverflow) *
DE287405C (enrdf_load_stackoverflow) *
DE456095C (de) * 1925-04-15 1928-02-15 Willi Hencke Streichverschluss fuer Ofentueren
JPS5414255A (en) * 1977-07-04 1979-02-02 Seiko Epson Corp Liquid crystal display panel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2078094A5 (enrdf_load_stackoverflow) * 1970-02-02 1971-11-05 Allegheny Ludlum Ind Inc
FR2154803A1 (enrdf_load_stackoverflow) * 1971-09-28 1973-05-11 Librawerk Pelz & Nagel Kg
DE2601658A1 (de) * 1976-01-17 1977-07-28 J F Mahler Fa Kuehlvorrichtung fuer einen durchlaufofen
DE3541873C1 (en) * 1985-11-27 1987-01-02 Fuchs Systemtechnik Gmbh Furnace vessel of an electric arc furnace

Also Published As

Publication number Publication date
JPH02309186A (ja) 1990-12-25
DE3916183C2 (enrdf_load_stackoverflow) 1991-04-25
DE3916183A1 (de) 1990-11-22

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