EP0171658B1 - Vorrichtung für den Bodenabstich einer Metallschmelze aus einem Schmelzofen oder einer Giesspfanne - Google Patents

Vorrichtung für den Bodenabstich einer Metallschmelze aus einem Schmelzofen oder einer Giesspfanne Download PDF

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Publication number
EP0171658B1
EP0171658B1 EP85109155A EP85109155A EP0171658B1 EP 0171658 B1 EP0171658 B1 EP 0171658B1 EP 85109155 A EP85109155 A EP 85109155A EP 85109155 A EP85109155 A EP 85109155A EP 0171658 B1 EP0171658 B1 EP 0171658B1
Authority
EP
European Patent Office
Prior art keywords
tapping
closure plate
tapping orifice
orifice
plate
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
Application number
EP85109155A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0171658A1 (de
Inventor
Karl-Heinz Klein
Volkwin Werner Köster
Günter Paul
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.)
Badische Stahl Engineering GmbH
Original Assignee
Badische Stahl Engineering GmbH
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 Badische Stahl Engineering GmbH filed Critical Badische Stahl Engineering GmbH
Priority to AT85109155T priority Critical patent/ATE33895T1/de
Publication of EP0171658A1 publication Critical patent/EP0171658A1/de
Application granted granted Critical
Publication of EP0171658B1 publication Critical patent/EP0171658B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/19—Arrangements of devices for discharging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/44—Consumable closure means, i.e. closure means being used only once
    • B22D41/46—Refractory plugging masses
    • 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
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F27D3/1509—Tapping equipment
    • F27D3/1536—Devices for plugging tap holes, e.g. plugs stoppers

Definitions

  • the invention relates to a device for bottom tapping a molten metal from a melting furnace of the type specified in the preamble of claim 1.
  • Metals including ferrous metals, for which the device according to the invention is preferably intended, are subject to ever increasing demands with regard to the degree of purity.
  • the pouring jet When pouring a molten metal from a melting furnace into a casting plan, however, the pouring jet is exposed to atmospheric influences, so that the molten metal is enriched with oxygen, nitrogen and hydrogen via the pouring jet.
  • These elements or their connections deteriorate the degree of purity of the molten metal. This deterioration can be limited by shortening the pouring times and the pouring distances.
  • the protection of the pouring jet against atmospheric influences must therefore be limited to the shortening of the pouring jet and the pouring time due to the bottom tapping.
  • the reduction in the pouring time of the molten metal from the melting furnace also permits a lower tapping temperature, which in turn results in a reduction in the total batch time and at the same time saves energy.
  • the known bottom tapping devices suffer from some disadvantages because they work with flaps that open and close the bottom tapping opening via pneumatic or hydraulic cylinders, with the entire static pressure of the molten metal on the flap and over that during the melting process and the metallurgical work the associated linkage rests on the pneumatic or hydraulic drive. Therefore, irregularities in the pneumatic or hydraulic system of these floor tapping devices during the batch time and during tapping can lead to malfunctions and considerable damage. Because of the way they work, they also require a certain distance between the individual units, which results in a longer pouring stream.
  • a closure plate is provided on the crucible of the melting furnace, which avoids the disadvantage of the statistical pressure of the molten metal being absorbed by a hydraulic system or pneumatic system.
  • the closure plate holds the static pressure of the molten metal mechanically and is actuated via a swivel axis and bevel gears by means of a handwheel.
  • the disadvantage of this closure plate is that it must be very close to the mouth of the tap hole in the bottom of the crucible to prevent the metal melt from flowing away. This cannot be reliably achieved with the large and constantly different thermal loads on the closure plate, which is why it is only used for a short time to close the bottom tapping opening.
  • the molten metal is frozen in front of the closure plate or in the bottom tapping opening and only shortly before tapping this part of the melt is melted by electrical energy in the bottom tapping opening.
  • a vessel for metallurgical melts in particular a pan for casting steel melts, with a tap opening in the bottom and a closure plate for the tap opening which can be slid or swiveled beneath it, the tap opening closed by the closure plate and the closure plate being sealed at its lower mouth is present, filled with a granular refractory material, at the mouth facing the interior of the vessel is covered with a porous circuit board made of an equally refractory material and a treatment medium for the melt contained in the vessel is applied (EP-A 0 062 790).
  • a device for the electrically controlled casting of metal, in particular steel, from containers, in particular ladles, with a tap opening in the bottom belongs to the prior art, the tap opening being assigned at least one AC coil and the Tapping opening is closed by means of a closure plate which is pressed against the lower mouth of the tapping opening and carries a sealing plug received in the tapping opening.
  • the tap hole above the sealing plug can be filled with a small amount of a refractory material, such as gravel, asbestos or the like (DE-B 1 049 547).
  • the object of the invention is to provide a device for tapping a molten metal from a melting furnace of the type specified in the preamble of claim 1, which ensures safe operation in a simple manner even with the greatest mechanical and thermal stress and is maintenance-free.
  • the tap opening in the bottom of the melting furnace is closed by means of a closing plate in connection with a loose, dry, refractory granulate, with which the tap opening or a partial length of the tap opening is filled.
  • the plate prevents the granules from flowing downwards, absorbs the static pressure of the molten metal and is located directly under the lower mouth of the tap opening.
  • the plate is simply moved or turned in the horizontal direction.
  • the upper plane of the plate is at a distance of 2 to 15 mm, preferably 5 to 8 mm, from the plane of the lower mouth of the tap opening, the distance depending on the granularity of the granules.
  • the diameter of the plate is 2 to 3 times as large as the diameter of the tap opening or even larger.
  • the plate can be provided with a recess and / or roughened.
  • the plate To open the tap opening, the plate is simply moved away from its mouth so that the granulate falls out of the tap opening or is pressed out by the static pressure of the molten metal and the molten metal can flow out.
  • the movement of the plate takes place either in a straight line on slide rails, which are fixedly attached to the melting furnace, or from a vertical pivot axis, to which the plate is attached, so that the latter moves along a circular path when the pivot axis is rotated.
  • the device according to the invention is characterized by an extremely low overall height.
  • the movement of the plate is preferably effected by means of a pneumatic cylinder, which is fed from the normal works network. Provision can be made so that the plate and swivel axis can be actuated by means of a hand lever in the event of a failure of the compressed air, and that the plate can be secured by means of plug bolts during repair work in the area of the floor tapping device.
  • the pouring jet can be completely protected against atmospheric influences during tapping. This is done in such a way that, when the plate is moved away from the tap opening, a protective tube is inserted or pivoted in, which shields the pouring jet and is coupled to the plate, so that an additional control or an additional drive is not required for its movement. It is only necessary to provide that in the corresponding end position of the common movement drive for the plate and the protective tube, the axis of the latter coincides with that of the tap opening.
  • auxiliary devices for metallurgical purposes can also be retracted or swung in, for example a probe for detecting the end of the metal beam, which can also be combined with the protective tube, or a siphon for the complete separation of metal and slag.
  • the molten metal 2 located in an electric arc furnace 1 flows in a pouring jet 3 into a ladle 4, namely through an open tap hole 5 in the bottom of the electric arc furnace 1.
  • a closure plate 6 is provided to cover the tap opening 5.
  • the plate 6 for closing the tap opening 5 is brought into congruence with the tap opening 5 by means of a double-acting pneumatic cylinder 11 with the aid of a double-acting pneumatic cylinder 11, so that there is a gap 7 between the plate 6 and the tap opening 5.
  • the tap opening 5 is provided with a filling 8 by introducing granules with a certain grain size into the tap opening 5 from above by means of a funnel.
  • a melting process can then be carried out in the usual manner in the electric arc furnace 1.
  • the cylinder 11 is simply actuated via a valve, which swings the plate 6 out of the region of the tap opening 5 via the pivot axis 10. As soon as the plate 6 has left this area, the granulate of the filling 8 falls out of the tap opening 5 or it is pressed out of the same by the static pressure of the molten metal 2, so that the molten metal 2 can flow into the ladle 4.
  • the plate 6 can be closed and opened by hand using a hand lever 13 in the event of a failure of the compressed air.
  • the process described above is repeated.
  • the plate 6 is brought into the covering position and granulate is filled into the tap opening 5, so that the filling 8 results. A new melting process can then begin.
  • the extended device according to FIGS. 5 to 7 differs from that according to FIGS. 3 and 4 essentially only in that, in addition to the plate 6, the protective tube 9 according to FIG. 2 is provided and the movement mechanism for the plate 6 also the protective tube 9 for the Pouring stream 3 (Fig. 2) is assigned so that the plate 6 and the protective tube 9 are pivoted at the same time in order to alternately get under the tap hole 5, as shown in Fig. 5 and 6, 7 respectively.
  • the device according to FIGS. 8 and 9 essentially corresponds to that according to FIGS. 3 and 4, apart from the fact that the plate 6 is displaceable in slide rails 12.
  • the extended device according to FIGS. 10 and 11 differs from that according to FIGS. 8 and 9 essentially only in that, analogously to the embodiment according to FIGS. 5 to 7, the protective tube 9 according to FIG. 2 is provided in addition to the plate 6 and the movement mechanism according to 8 and 9 is designed such that the plate 6 and the protective tube 9 for the pouring jet 3 (FIG. 2) are displaced with respect to the tap opening 5 analogously to the pivoting described in FIGS. 5 to 7 in the slide rails 12.
  • the protective tube 9 can also be replaced by other metallurgical devices, not shown.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Manufacture Of Iron (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP85109155A 1984-07-28 1985-07-23 Vorrichtung für den Bodenabstich einer Metallschmelze aus einem Schmelzofen oder einer Giesspfanne Expired EP0171658B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85109155T ATE33895T1 (de) 1984-07-28 1985-07-23 Vorrichtung fuer den bodenabstich einer metallschmelze aus einem schmelzofen oder einer giesspfanne.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8422585U 1984-07-28
DE19848422585U DE8422585U1 (de) 1984-07-28 1984-07-28 Vorrichtung zum bodenabstich einer metallschmelze aus einem schmelzofen oder einer giesspfanne

Publications (2)

Publication Number Publication Date
EP0171658A1 EP0171658A1 (de) 1986-02-19
EP0171658B1 true EP0171658B1 (de) 1988-04-27

Family

ID=6769309

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85109155A Expired EP0171658B1 (de) 1984-07-28 1985-07-23 Vorrichtung für den Bodenabstich einer Metallschmelze aus einem Schmelzofen oder einer Giesspfanne

Country Status (5)

Country Link
EP (1) EP0171658B1 (es)
JP (1) JPS61105094A (es)
AT (1) ATE33895T1 (es)
DE (1) DE8422585U1 (es)
ES (1) ES296051Y (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4009291A1 (de) * 1990-03-20 1991-09-26 Mannesmann Ag Verfahren und vorrichtung zum abstechen von stahl

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3700895A1 (de) * 1987-01-14 1988-07-28 Intracon Handel Verschluss fuer bodenabstichloecher und dafuer geeignetes verschlussmaterial
DE3830342A1 (de) * 1988-09-07 1990-03-15 Radex Heraklith Zweigeteilter endstein
JPH0749356Y2 (ja) * 1992-06-08 1995-11-13 株式会社ニッコー 炉底出鋼口開閉装置
DE19646738C2 (de) * 1996-11-13 1998-12-17 Schloemann Siemag Ag Verfahren und Vorrichtung zum metallurgisch verbesserten Abstich von flüssigem Stahl aus einem Schmelzofen in eine Pfanne
CN115138833B (zh) * 2022-08-17 2023-10-24 巢湖云海镁业有限公司 一种镁合金铸轧的供液装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1049547B (de) * 1956-12-12 1959-01-29 Bochumer Ver Fuer Gussstahlfab Vorrichtung zum elektrisch gesteuerten Vergiessen von Metall
DE3041029A1 (de) * 1980-10-31 1982-06-16 Zimmermann & Jansen GmbH, 5160 Düren Bodenverschluss fuer einen schmelzofen, insbesondere einen lichtbogenschmelzofen
DE3115108A1 (de) * 1981-04-14 1982-10-28 Purmetall Gesellschaft für Stahlveredelung GmbH u. Co Betriebskommanditgesellschaft, 4200 Oberhausen Gefaess fuer metallurgische schmelzen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4009291A1 (de) * 1990-03-20 1991-09-26 Mannesmann Ag Verfahren und vorrichtung zum abstechen von stahl

Also Published As

Publication number Publication date
ATE33895T1 (de) 1988-05-15
EP0171658A1 (de) 1986-02-19
ES296051U (es) 1987-07-16
JPS61105094A (ja) 1986-05-23
ES296051Y (es) 1988-01-16
DE8422585U1 (de) 1984-12-20

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