EP0359052B1 - Gasspülstein-Einrichtung für metalurrgische Schmelzgefässe. - Google Patents

Gasspülstein-Einrichtung für metalurrgische Schmelzgefässe. Download PDF

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Publication number
EP0359052B1
EP0359052B1 EP89116117A EP89116117A EP0359052B1 EP 0359052 B1 EP0359052 B1 EP 0359052B1 EP 89116117 A EP89116117 A EP 89116117A EP 89116117 A EP89116117 A EP 89116117A EP 0359052 B1 EP0359052 B1 EP 0359052B1
Authority
EP
European Patent Office
Prior art keywords
gas
arrangement according
connection
safety block
connection piece
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
EP89116117A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0359052A1 (de
Inventor
Helmut Dipl.-Ing. Preyer
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.)
Dr Markus Fellner
RHI AG
Original Assignee
Radex Heraklith Industriebeteiligungs AG
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 Radex Heraklith Industriebeteiligungs AG filed Critical Radex Heraklith Industriebeteiligungs AG
Priority to AT89116117T priority Critical patent/ATE83507T1/de
Publication of EP0359052A1 publication Critical patent/EP0359052A1/de
Application granted granted Critical
Publication of EP0359052B1 publication Critical patent/EP0359052B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies therefor
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ

Definitions

  • Porous ceramic gas purging stones for blowing treatment gases, in particular inert gases, into metallurgical melting vessels have long been known. They are divided, among other things, into sink blocks with directed and undirected porosity or joint washer.
  • the invention is directed to a gas purging device with a gas purging plug and a breakthrough protection.
  • the known breakdown protection consists of a fuse block made of refractory ceramic material, in which one or more gas lines are arranged in a spiral.
  • the fuse block is fixed with the help of a refractory mortar to the gas purging plug arranged above it, so that the gas flow through the gas lines in the fuse block then flows through the porous ceramic purging body and can be guided into the molten metal from there.
  • the invention is based on the object of developing a generic gas purging device in such a way that the breakthrough protection in the event that no molten metal has penetrated into the gas line can be reused and only the actual porous purging plug section has to be replaced.
  • the essential idea of the invention is to fix the corresponding surfaces of the porous gas purging plug and the fuse block in a sealing but detachable manner to one another by means of suitable connecting systems.
  • the gas connection piece in the gas purging plug and the connecting piece in the fuse block are primarily responsible for the safe, flat installation of the gas purging plug and fuse block on the one hand, but also for the detachability of the two parts from the other.
  • the gas connecting piece and the connecting piece - as well as the gas line and the adapter - should consist of metal parts.
  • Metal parts have the advantage that, with high strength and sufficient temperature resistance (the parts are located in the area of the flushing system facing away from the molten metal), they are not as brittle as ceramic components, although the parts mentioned are also made of a ceramic material, in particular based Alumina or zirconia.
  • the gas connecting piece project inwards into the ceramic material of the gas flushing plug, the connecting piece then preferably being formed with an internal thread. Accordingly, of course, the connector then projects beyond the corresponding contact surface of the fuse block and has a corresponding external thread.
  • the gas connecting piece is preferably firmly connected, for example welded, to the base plate of the gas purging plug.
  • the floor plate is preferably firmly connected, for example welded, to the base plate of the gas purging plug.
  • the gas connection piece and connection piece are designed to form a common bayonet lock, that is to say a bayonet-type lock system is used instead of the threaded connection.
  • the invention also proposes to arrange a thin elastic intermediate layer between the fuse block and the gas purging plug, which preferably consists of a refractory ceramic fiber mat and is glued, for example, to the underside of the bottom of the sheet metal jacket.
  • At least one further seal can also be provided between the two, which according to an advantageous embodiment of the invention is arranged on the step formed in the gas connection piece or connection piece and, for example, made of copper -Sealing ring exists.
  • the gas line which ends at one end in the connector, is preferably arranged below the connecting elements to the gas purging plug and extends approximately at right angles to the central axis of the connector and is connected to it in a gastight manner. In this way, a kind of reinforcement is simultaneously provided for the connector, which is at least partially embedded in the refractory ceramic matrix material of the fuse block.
  • the gas lines are spiral or siphon-like, but at least with several bends and intermediate sections, before they open into the adapter mentioned above, which is brought into connection with an external gas source, at a distance from the attachment can.
  • This adapter is preferably arranged opposite the connecting piece in the region of the lower end face of the fuse block.
  • an advantageous embodiment of the invention provides for the fuse block to be designed with an actuating device via which the fuse block can be moved manually or with the aid of a tool .
  • a particularly simple embodiment provides for this to provide at least two metal arms which are arranged at a distance from one another and fastened in the securing block and protrude outward beyond the lower end face of the securing block, the protruding area being easily encircled by a tool for subsequent manipulation when being placed on the gas purging plug.
  • the bottom plate of the gas purging plug can either lie directly against the ceramic matrix mass, but it is also possible to arrange a cavity (gas distribution chamber) between the bottom of the sheet jacket and the bottom of the porous ceramic body with the help of appropriate spacers. In this way, the amount of gas flushed in via the gas connecting piece can be distributed favorably over the entire surface of the gas purging plug.
  • the invention offers a further significant advantage.
  • a normal gas purging plug (without breakthrough protection) is pulled out of the wall or the bottom of the metallurgical melting vessel by means of a so-called pull-out device.
  • a pull-out device Such a device and the associated method are described for example in EP-B-137 961.
  • a coupling cylinder is to be provided around the gas connecting piece, which projects beyond the gas connecting piece and to which the pull-out device is then articulated.
  • this effort can be reduced because, for example, the external thread on the gas connection piece or the bayonet lock can be used directly to attach an appropriate extractor.
  • the gas connecting piece thus fulfills a double function and the design effort on the gas purging plug can thereby be further reduced and the repair process can be simplified.
  • the gas purging plug 10 according to FIG. 1 is one with a directed porosity, the individual gas channels not being shown. A joint washer or a gas purging plug with undirected porosity could also be used.
  • the gas purging stone 10 is surrounded in its lower part shown in FIG. 1 by a sheet metal jacket 12 (mortared in this), the sheet metal jacket 12 merging on the underside into a base sheet 14 which has a significantly higher material thickness than the sheet metal casing 12 on the circumference.
  • the lower end face 16 of the gas purging plug 10 is at a distance from the base plate 14, which is done by means of corresponding (not shown) vertical spacers.
  • the base plate 14 has an opening 18 and in this area a gas connection piece 20 is welded to the base plate 14.
  • the metallic gas connecting piece 20 has in its area below the base plate 14 an external thread 22 designed as a movement thread with a round or trapezoidal profile.
  • a refractory ceramic fiber mat 24 is glued around the gas connection piece 20.
  • the fuse block 30 has a cylindrical shape and consists of a refractory inorganic matrix material 22, for example ceramic or concrete.
  • a metallic connecting piece 36 extends from the upper end face 34 of the fuse block into the interior of the fuse block.
  • the connecting piece 36 essentially has a pot shape and the upper section of the inner surface 38 is formed with an internal thread 40 corresponding to the external thread 22 of the gas connecting piece 20.
  • the inner surface 38 of the connecting piece 36 projects inwards (42) in a step-like manner and from there extends in a cylindrical manner towards the bottom 44 of the connecting piece 36.
  • An annular copper seal 43 according to DIN 7603 rests on step 42.
  • a gas line 48 made of copper extends from the lower cylindrical section 46 (to the left or right in the plane of the drawing), the gas lines each being welded to the connecting piece 36.
  • an adapter 52 similar to the connector 36, runs inwards into the matrix material 32, the adapter 52 also being cup-shaped with a cylindrical center opening 54 that is open at the bottom.
  • the gas lines 48 now run in mirror image from the connector 36 to the adapter 52, only the connection areas being shown for reasons of clarity.
  • the course of the gas lines 48 can be practically arbitrary, but in any case the gas lines have at least one curved section, which is preferably designed in a spiral or siphon-like manner, as in the Radex Rundschau (loc. Cit. Or in EP-B- 137 968) shown and described. This gives the device its safety function in the event of the penetration of molten metal, which then freezes quickly due to the coiled sections.
  • connection areas of the gas lines 48 also act as reinforcement for a secure fit of the connector 36 or adapter 52 in the matrix material 32.
  • FIG. 2 further shows that two metal arms 56 extend away on both sides of the adapter 52, which initially run parallel to the lower end face 50 of the fuse block 30 and then project downwards over the lower end face 50 at a distance from the adapter 52 are angled.
  • the metal arms 56 are welded to the adapter 52.
  • the gas purging device is constructed as follows. First, the sink is fixed in a known manner, for example in a perforated brick in the bottom of a metallurgical melting vessel. Thereafter, the fuse block 30 is screwed onto the gas connecting piece 20 of the gas purging plug 10 with the aid of the connecting piece 36. This is done with the aid of a tool which grips the downwardly projecting sections 58 of the metal arms 56.
  • the upper end face 34 of the securing block 30 abuts the fiber mat 24 and compresses it until the lower end face 20a of the gas connecting piece 20 abuts the step 42 or the seal 43 arranged thereon.
  • the fuse block 30 has reached its final position with respect to the gas purging plug 10 and the two are firmly connected to one another.
  • the gas purging plug and fuse block could also be joined together prior to assembly.
  • an external gas source can now be connected to the adapter 52 and the gas then flows through the gas lines 48 via the connecting piece 36 through the gas connecting piece 20 into the gas distribution chamber 26 and then finally through the (not shown) feed channels in the gas purging plug 10 into the metallurgical Weld pool.
  • the securing block 30 is first unscrewed and put away again in the opposite manner to that described above during assembly using a tool. Thereafter, the auxiliary tool 60 shown in FIG. 3, which has a substantially cylindrical shape, is screwed onto the gas connecting piece 20.
  • the tool 60 is formed in its upper part analogously to the upper section of the connecting piece 36, that is to say with an internal thread 62 and a step 64.
  • a suitable pull-out device is arranged around the gas purging plug 10 and this pull-out device then engages the side arms 66 in the lower section of the Tool 60 and a suitable pulling device is now used to pull the gas purging plug 10 out of the perforated brick or the floor or wall of the metallurgical melting vessel with the aid of tool 60.
  • the gas connecting piece 22 is therefore not satisfied. only the function of a gas supply line, but also serves as an intermediate piece when attaching a tool for the pull-out device.
  • fuse block 30 can be used several times due to the design according to the invention and only has to be discarded if a metal melt breakthrough has occurred and metal melt has penetrated into the connecting part 36 or the gas lines 48 and has solidified there.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Furnace Details (AREA)
EP89116117A 1988-09-10 1989-08-31 Gasspülstein-Einrichtung für metalurrgische Schmelzgefässe. Expired - Lifetime EP0359052B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89116117T ATE83507T1 (de) 1988-09-10 1989-08-31 Gasspuelstein-einrichtung fuer metalurrgische schmelzgefaesse.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3830871A DE3830871C1 (xx) 1988-09-10 1988-09-10
DE3830871 1988-09-10

Publications (2)

Publication Number Publication Date
EP0359052A1 EP0359052A1 (de) 1990-03-21
EP0359052B1 true EP0359052B1 (de) 1992-12-16

Family

ID=6362724

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89116117A Expired - Lifetime EP0359052B1 (de) 1988-09-10 1989-08-31 Gasspülstein-Einrichtung für metalurrgische Schmelzgefässe.

Country Status (5)

Country Link
US (1) US5152954A (xx)
EP (1) EP0359052B1 (xx)
AT (1) ATE83507T1 (xx)
CA (1) CA1334790C (xx)
DE (2) DE3830871C1 (xx)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4121329C2 (de) * 1991-06-28 1995-09-07 Veitsch Radex Ag Gasspülstein
US5249779A (en) * 1992-07-10 1993-10-05 Labate Ii Michael D Modified manifold assembly for directional gas distribution device
US5573724A (en) * 1994-07-29 1996-11-12 Magneco/Metrel, Inc. Ladle port assembly

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3110204A1 (de) * 1981-03-17 1982-10-14 Didier-Werke Ag, 6200 Wiesbaden Vorrichtung zum einfuehren von gasen in metallurgische gefaesse
AT376455B (de) * 1982-10-06 1984-11-26 Oesterr Amerikan Magnesit Metallurgischer ofen oder metallurgisches gefaess
ATE44771T1 (de) * 1985-12-04 1989-08-15 Didier Werke Ag Gasspueleinrichtung fuer schmelzenbehaelter.
DE3634448A1 (de) * 1986-10-09 1988-04-21 Didier Werke Ag Spueleinrichtung
GB8703717D0 (en) * 1987-02-18 1987-03-25 Injectall Ltd Injecting gas into metal melts
DE3716920A1 (de) * 1987-05-20 1988-12-08 Steuler Industriewerke Gmbh Gasspuelsystem mit gasdurchbruchssicherung

Also Published As

Publication number Publication date
EP0359052A1 (de) 1990-03-21
CA1334790C (en) 1995-03-21
ATE83507T1 (de) 1993-01-15
DE58903018D1 (de) 1993-01-28
US5152954A (en) 1992-10-06
DE3830871C1 (xx) 1989-11-02

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