EP0689486A1 - Ameliorations relatives a des cuves de manipulation de metal fondu - Google Patents

Ameliorations relatives a des cuves de manipulation de metal fondu

Info

Publication number
EP0689486A1
EP0689486A1 EP93907923A EP93907923A EP0689486A1 EP 0689486 A1 EP0689486 A1 EP 0689486A1 EP 93907923 A EP93907923 A EP 93907923A EP 93907923 A EP93907923 A EP 93907923A EP 0689486 A1 EP0689486 A1 EP 0689486A1
Authority
EP
European Patent Office
Prior art keywords
outlet
tube
valve
gas
vessel
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.)
Withdrawn
Application number
EP93907923A
Other languages
German (de)
English (en)
Inventor
Gunnar Broms
Tore SÖDERBERG
Kevin J. Cook
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.)
Foseco International Ltd
Ifa Institutet For Produktions & Arbetsplatsutveckling AB
Original Assignee
Foseco International Ltd
Ifa Institutet For Produktions & Arbetsplatsutveckling AB
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 Foseco International Ltd, Ifa Institutet For Produktions & Arbetsplatsutveckling AB filed Critical Foseco International Ltd
Publication of EP0689486A1 publication Critical patent/EP0689486A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
    • B22D41/42—Features relating to gas injection
    • 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
    • B22D41/465—Unplugging a vessel discharge port

Definitions

  • This invention relates to molten metal handling vessels and is particularly concerned to provide a procedure and an appliance to improve the opening of the bottom of the vessel, e.g. a ladle.
  • a valve which comprises of movable valve parts with flow passages which, in the valve's closed position, are displaced from each other and in the valve's open position are essentially in line with each other so that the melt can flow from the vessel through the flow passages.
  • Valves of this type and their peripheral eguipment are called sliding gate systems and are available in several designs, including those where the valve parts trace rectilinear translatoral relative movements and those where the valve parts trace relative rotary movements. Examples of valves of this type are described in WO/37/07306 among others.
  • the tap hole In the bottom of the ladle there is a tap hole which leads to the sliding gate valve system. To prevent the melt running down into the valve and solidifying, blocking the tap channel as a result, the tap hole is usually filled with sand. In spite of this it is a critical moment during the steel manufacturing process when a tap valve on a ladle filled with molten steel is to be opened to let the steel flow down into an ingot mould or tundish. What occurs in a proportion of cases is that the steel does not run out when the valve is opened due to some form of blockage in it or in the connection with the tap hole.
  • Trials have been carried out to blow in argon gas into the tap channel just before the sliding gate is opened, by which the channel is pressurised so that the high temperature sintered sand shell or possibly the solidified steel, which covers the mouth of the tap hole, is removed.
  • the argon gas has been introduced at the lower part of the tap channel in the valves , s closed position and thus, under great resistance must push its way up through the whole pillar of sand to reach the upper part.
  • the invention is based on the utilisation of gas, preferably argon gas, with a means of introducing it relatively high up in the tap channel.
  • gas preferably argon gas
  • a tube of relatively frangible material is introduced into the tap channel where the tube in the closed position of the valve extends through both parts of the valve. Thereafter, gas is blown through the tube, whereupon the valve is opened during which the tube is sheared off. The sheared off end of the tube follows the outflowing sand before a stream of molten steel then follows during tapping.
  • the invention provides an apparatus to open and close an outlet in a molten metal handling vessel which includes a valve communicating with the outlet and having relatively movable valve parts, the valve parts having openings which are displaced from one another to close the valve and, hence, the outlet and which are in communication with each other and with the outlet to open the outlet, whereby the molten metal can flow out of the vessel, characterised in that there is provided a frangible tube through which gas can be passed, the tube being of sufficient length to extend through both valve parts and into the outlet of the vessel, whereby gas can be passed into the outlet and then opening of the valve by relative movement of the valve parts breaks the tube so that it does not obstruct opening.
  • the invention provides a method of opening and closing an outlet in a molten metal handling vessel in which a valve is positioned to communicate with the outlet, the valve having relatively movable valve parts, the valve parts having openings which are displaced from one another to close the valve and, hence, the outlet and which are positioned in communication with each other and with the outlet to open the outlet, whereby molten metal can flow out of the vessel, characterised in that a frangible tube is inserted through the valve parts into the outlet while the valve is in the closed position, gas is injected into the outlet through the tube to remove any obstruction to the outlet and the valve is opened thereby shearing off the length of tube in the outlet.
  • the relatively frangible tube may extend through a section of the movable valve part by the side of its flow passage and up through the passage in the fixed valve part.
  • Figure l shows a section of the bottom part of a ladle and with an applied sliding gate system set up in accordance with the invention
  • FIGS 2, 3 and 4 are similar sections showing subsequent stages when opening the valve
  • Figure 5 shows on a larger scale a plan view of a suitable design for the gas tube; and Figure 6 shows in a somewhat similar larger scale, a suitable design for the connection of the gas tube to the sliding gate assembly.
  • 1 denotes the bottom of a ladle
  • 2 the brick lining of the ladle
  • 3 a hole in the bottom of the ladle.
  • a well block 4 is placed in hole 3 and is lined with a ceramic tube 5, (which is called the inner nozzle) and which defines the tap channel 5a of the ladle.
  • a sliding gate valve system 6 Fixed to the ladle bottom 1 is a sliding gate valve system 6 which comprises an upper housing 7 and a similar lower, movable housing part 8.
  • the sliding gate system 6 is a unit which can be attached to and then separated from the ladle. It comprises an upper housing 7 containing a refractory valve plate 9 and having a flow passage opening 10 therethrough and a lower housing 8 containing a refractory valve plate 11 with an exit channel 12.
  • the upper part of the sliding gate system 7 is arranged so that in the position shown in the figure it is immovable relative to the ladle, whereby the flow passage opening 10 is positioned coaxially under the opening defined by the inner nozzle 5, i.e. it is coaxial with the tap channel 5a.
  • a gas tube 13 runs through the lower housing 8 and the portion of the valve plate 11 that closes off the tap channel 5a.
  • the upper end of the gas tube 13 extends into the upper part of the channel 5a and its lower end sits in a sealing connection piece 14 which abuts against the underside of the lower housing.
  • a source, not shown, of gas can be connected to the gas tube via connection 14.
  • the gas tube 13 is of a relatively frangible, i.e. a relatively brittle, refractory material. Alternatively, only a portion of the length of the tube need be frangible with the remainder of the length being of, e.g. metal.
  • connection piece 14 may be carried out on an industrial scale of units comprising the connection piece 14 with gas tube 13 preassembled so ⁇ ⁇ that the gas tube can be positioned into the pre- manufactured hole in the valve plate 11.
  • the connection piece 14 can be kept in place with help of an agent (not shown).
  • an agent not shown.
  • One variation of the gas tube with a connection agent is described later with reference to Figure 6 but it will be appreciated that any suitable connecting means may be employed without departing from the scope and spirit of the invention.
  • gas is blown in, preferably argon gas, through the connection piece 14 to break up the obstruction in the tap channel, i.e. the sintered sand crust 15, which in Figure 2 is shown in the broken up state.
  • gas pressure is introduced just below the obstruction which is to be removed. Furthermore, most of the sand will be left in the nozzle and consequently prevents the melt from pushing down the nozzle with the attendant risk of solidification and blocking of the tapping channel.
  • the remaining sand gives a downward back pressure resulting in a decreased risk for leakage.
  • the movable lower housing part 8 can be moved to the right as Figure 1 to open the nozzle hole unit.
  • the gas tube 13 meets the inner nozzle 5 inner wall and is cut off against the latter's lower edge. This position is shown in Figure 3. In practice, however, the gas tube will break earlier due to its inserted part being fixed - ⁇ -
  • the gas tube 13 is made of ceramic material which can withstand temperatures equivalent to the melting temperature of steel and, in addition, easily breaks off when the valve opens.
  • the tube is provided with several - in the shown example four - holes or channels 13a extending axially throughout its length.
  • the valve opens the gas tube breaks as mentioned and a piece of it is left in the movable valve plate 8. If the sliding gate unit has to be closed during ongoing tapping, the remaining piece of tube will form a plug and the remaining accessible outflowing area is defined by the hole in the tube. Therefore, it is advantageous instead of one relatively large hole, to have several smaller holes which let the gas through freely but impede the melt from passing through by its solidifying and thereby blocking its own passage.
  • annular connector 14' having a central bore 15 aligned co-axially with bore 16 in part 8.
  • Connector 14' has a depending lower annular portion 14b which is externally threaded and whose central bore 17 is coaxial with bores 15 and 16 but is of larger diameter.
  • a shoulder 18 is provided on the inside bore of connector 14'. Bores 15 and 16 are of larger diameter than the outer diameter of tube 13 so that the latter can be freely inserted through these two holes and up through the more exactly adapted hole in the valve plate 11, i.e. the hole in plate 11 is a closer fit around the tube.
  • tube 13 passes up through flow passage opening 10 in upper valve plate 9 (not shown in Figure 6).
  • the annular gap between the gas tube 13 and the holes 15 and 16 should be so small that penetration by the melt is avoided as far as possible.
  • a bore hole 17 is arranged with a larger diameter than the hole 15, so that a shoulder 18 is formed.
  • This shoulder serves as a seat for an annular sleeve 19, which is preferably cemented to the gas tube 13 just above its lower region 13'.
  • the length of sleeve 19 determines how far tube 13 extends into the tap channel 5a.
  • connection nipple 21 is provided for a gas pipe (not shown), the nipple having a gas channel 22 therethrough and an outwardly directed flange 23.
  • the gas channel 22 is widened to provide larger bore 24 in the region of flange 23.
  • Bore 24, with some free play, houses the bottom 13' of gas jtube 13.
  • annular groove 25 is formed with a lesser depth than the thickness of 0-ring 20 and an inside diameter corresponding to the outer diameter of the 0-ring.
  • connection nipple 21 is then fitted so that its bore 24 surrounds lower end 13', so that the 0-ring seats in the groove 25.
  • a clamp bolt 26 is screwed on the threaded portion 14b of connection piece 14.
  • Bolt 26 has an inward flange 27 which contacts the flange 23 which, under compression of the 0-ring, pushes the sleeve 19 against the shoulder 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Safety Valves (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

L'invention se rapporte à un moyen permettant d'introduire un gaz dans un orifice de sortie afin d'enlever une obstruction. L'invention se rapporte également à un appareil permettant d'ouvrir et de refermer un orifice de sortie dans une cuve de manipulation de métal fondu, et qui comprend une vanne (6) communiquant avec l'orifice de sortie (5a) et pourvue de parties (7, 8) relativement mobiles présentant des ouvertures (10, 12) qui sont décalées l'une par rapport à l'autre afin de refermer la vanne et, ainsi, l'orifice de sortie, et qui communiquent réciproquement ainsi qu'avec l'orifice de sortie (5a) afin d'ouvrir ce dernier. L'appareil se caractérise en ce qu'il comprend un tube cassable (13) à travers lequel on peut faire passer un gaz, le tube (13) étant suffisamment long pour s'étendre à travers les deux parties (7, 8) de la vanne et dans l'orifice de sortie (5a) de la cuve, de sorte qu'un gaz puisse être amené à passer dans l'orifice de sortie et que l'ouverture de la vanne (6), effectuée par le mouvement relatif des parties (7, 8), brise le tube (13) afin qu'il ne puisse obstruer l'orifice.
EP93907923A 1993-03-22 1993-03-22 Ameliorations relatives a des cuves de manipulation de metal fondu Withdrawn EP0689486A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/GB1993/000485 WO1994021406A1 (fr) 1992-03-11 1993-03-22 Ameliorations relatives a des cuves de manipulation de metal fondu
BR9307841A BR9307841A (pt) 1992-03-11 1993-03-22 Aparelho para abrir e fechar uma descarga em um recipiente de manuseio de metal em fusão processo de abertura e fechamento de uma descarga de um resipiente de manuseio de metal em fusão e tubo frangível

Publications (1)

Publication Number Publication Date
EP0689486A1 true EP0689486A1 (fr) 1996-01-03

Family

ID=25664597

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93907923A Withdrawn EP0689486A1 (fr) 1993-03-22 1993-03-22 Ameliorations relatives a des cuves de manipulation de metal fondu

Country Status (8)

Country Link
EP (1) EP0689486A1 (fr)
JP (1) JPH08511729A (fr)
AU (1) AU3893893A (fr)
BR (1) BR9307841A (fr)
FI (1) FI954421A (fr)
SE (1) SE469969B (fr)
WO (1) WO1994021406A1 (fr)
ZA (1) ZA931331B (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5939016A (en) * 1996-08-22 1999-08-17 Quantum Catalytics, L.L.C. Apparatus and method for tapping a molten metal bath
EP3023173B9 (fr) * 2014-09-29 2018-12-12 Refractory Intellectual Property GmbH & Co. KG Dispositif de fixation pour un corps creux en céramique cylindrique et pierre de lavage de gaz céramique ignifuge dotée d'un tel dispositif de fixation
DE102014114301A1 (de) * 2014-10-01 2016-04-07 Hermann Rauen GmbH & Co vorm. Steinhandel Rauen Vorrichtung und Verfahren zum Öffnen eines Ausgusskanals von metallurgischen Gefäßen
CN106493345B (zh) * 2016-11-22 2018-06-12 鞍钢铸钢有限公司 一种熔融金属罐浇注前对位方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2243200C3 (de) * 1972-09-01 1979-09-13 Vereinigte Oesterreichische Eisen- Und Stahlwerke - Alpine Montan Ag, Wien Behälter für schmelzflussige Metalle
DE3444514C2 (de) * 1984-12-06 1986-11-06 Klöckner-Werke AG, 4100 Duisburg Schieberverschluß für metallurgische Gefäße, insbesondere für Stahlpfannen, zum Einblasen von Gasen oder von in Gasen suspendierten Feststoffen
JPS61296650A (ja) * 1985-06-25 1986-12-27 Anelva Corp 四重極型質量分析計電源
GB8613106D0 (en) * 1986-05-29 1986-07-02 British Steel Corp Production of iron
JP2873239B2 (ja) * 1989-08-10 1999-03-24 日本原子力研究所 四重極質量分析計

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9421406A1 *

Also Published As

Publication number Publication date
WO1994021406A1 (fr) 1994-09-29
SE9200756L (sv) 1993-09-12
JPH08511729A (ja) 1996-12-10
ZA931331B (en) 1994-03-22
AU3893893A (en) 1994-10-11
FI954421A0 (fi) 1995-09-19
SE469969B (sv) 1993-10-18
FI954421A (fi) 1995-09-19
BR9307841A (pt) 1996-01-16
SE9200756D0 (sv) 1992-03-11

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