EP0696238B1 - Anordnung zur verbindung einer stopfenstange für ein metallurgisches gefäss mit ihrer hebevorrichtung und für die anordnung geeignete stopfenstange sowie verfahren zur herstellung der anordnung - Google Patents

Anordnung zur verbindung einer stopfenstange für ein metallurgisches gefäss mit ihrer hebevorrichtung und für die anordnung geeignete stopfenstange sowie verfahren zur herstellung der anordnung Download PDF

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Publication number
EP0696238B1
EP0696238B1 EP94912483A EP94912483A EP0696238B1 EP 0696238 B1 EP0696238 B1 EP 0696238B1 EP 94912483 A EP94912483 A EP 94912483A EP 94912483 A EP94912483 A EP 94912483A EP 0696238 B1 EP0696238 B1 EP 0696238B1
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EP
European Patent Office
Prior art keywords
rod
securing rod
stopper rod
face
stopper
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
EP94912483A
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German (de)
English (en)
French (fr)
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EP0696238A1 (de
Inventor
Burkhard Labod
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Individual
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Publication date
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Publication of EP0696238A1 publication Critical patent/EP0696238A1/de
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    • 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
    • B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening

Definitions

  • the invention relates to an arrangement of the type corresponding to the preamble of claim 1 and also includes a method for producing the device.
  • refractory stopper rods to control the flow of molten metal from a pan or tundish into a mold
  • the stopper rod is moved in the direction of its longitudinal axis by a lifting device adjacent to the outside of the tundish, whereby a pouring opening arranged at the bottom of the tundish, into which the stopper rod engages in the lowered state and flows completely, is opened more or less.
  • the flow of the molten metal can thus be regulated. In principle, this regulation is quite simple, but the extreme conditions prevailing in steel processing place special demands on the materials and the technical design of the plug rod.
  • the stopper rod has to withstand the action of a molten metal for hours.
  • the plug rod must also be suitable, the one acting on the plug rod during a casting process withstand strong temperature fluctuations and the laterally acting forces caused by the buoyancy of the molten metal, which exert a strong bending moment on the stopper rod. A breakage of the stopper rod inevitably means that the spout can no longer be closed, which results in an uncontrolled outflow of the melt. It therefore poses a significant security risk.
  • the stopper rod consists of a threaded steel rod at one end, onto which the actual ceramic stopper, which engages in the outlet opening of the tundish when later used, is screwed on.
  • the stopper several ceramic stopper tubes, which engage in the steel rod completely at their end faces via tongue and groove, are pushed on from the side of the steel rod opposite the stopper, so that when the tundish is filled with molten steel and the stopper rod is completely lowered, the stopper rod is covered Part of the plug rod protrudes from the melt by a certain length.
  • the stopper rod is mounted in the lifting device with the upper end of the steel rod.
  • this plug rod which is composed of several parts (plugs, plug pipes), that the connections between the individual parts are tight against the penetration of molten steel.
  • the connection points are therefore additionally cemented.
  • the prepared stopper rods are dried in a drying oven at approx. 100 ° C for approx. Two days before being used.
  • a disadvantage of this early embodiment is that the provision of the plug rods requires a relatively high amount of material and labor on site.
  • the steel rods also tend to warp due to the temperature gradients and fluctuations that occur during casting, which can easily cause the sheathing to break and thus destroy them the plug rod can lead.
  • Such plug rods are usually produced by isostatic pressing of powdered ceramic material into a blank, which is then fired, i.e. is subjected to a temperature treatment for the purpose of sintering.
  • a one-piece holding rod usually made of steel, which extends over a certain area into the stopper rod and is firmly connected to it.
  • a gas channel is incorporated into the holding rod, which communicates on the one hand with the longitudinal bore of the stopper rod and on the other hand with a connecting device for the gas supply line. It is particularly important that the connection between the support rod and the plug rod prevents ambient air from getting into the interior of the plug rod and thus into the molten steel, since this would lead to increased oxidation and thus to a deterioration in the steel quality.
  • connection between the ceramic stopper rod and the metallic retaining rod is particularly due to the high thermal and mechanical loads on the connection problematic.
  • a ceramic threaded insert which is adapted to the holding rod and which can be screwed into the stopper rod from above into a thread worked in by isostatic pressing in the upper region of the stopper rod.
  • the disadvantage of this device is that the wall thickness of the plug rod is greatly reduced in the area of the thread used, as a result of which it breaks easily in this area.
  • this device is relatively complex to manufacture because of the use of ceramic thread inserts which are to be produced separately.
  • both the stopper rod and the holding rod are simple to manufacture and also easy to separate, but the entire load occurring when the stopper rod is lifted acts on the material surrounding the transverse bore, which in turn often leads to material breaks. In addition, the production of a gas-tight connection is difficult.
  • a threaded bore is machined into the upper end of the stopper rod by isostatic pressing, into which the retaining rod is screwed directly into the stopper rod with its thread provided at the lower end.
  • a gas-tight connection between the stopper and the holding rods is possible with this device, but the different thermal expansion coefficients of ceramic result and steel to form stresses in the thread, which can lead to the plug rod breaking, particularly at higher temperatures.
  • a further development of the above-mentioned embodiments is a device according to EP 0 358 535 A 2.
  • a metallic threaded bushing is isostatically pressed in the upper region of the longitudinal bore, which is located on the outside via alternately arranged all-round grooves and all-round webs in engagement with the ceramic plug rod material.
  • An annular sealing surface is formed in the stopper rod above the threaded bushing by increasing the diameter of the longitudinal bore. From above, the holding rod provided with a corresponding thread can be screwed into the threaded bushing until a sealing collar arranged above the thread is supported on the sealing surface of the annular sealing seat.
  • an external thread is provided on the holding rod above the sealing collar in order to counter the stopper by means of a holding plate and a screwed-on nut.
  • a disadvantage of this embodiment is that the metallic threaded bushing can easily scale during firing, which can make it difficult to screw in the holding rod.
  • the tightening of the lock nut which counteracts the contact pressure of the sealing collar of the holding rod on the annular sealing surface of the stopper rod, can lead to a lifting of both sealing surfaces from one another due to the different thermal expansion coefficients of the materials.
  • This device is also relatively expensive to manufacture.
  • the sealing collar provided on the holding rod and the thread necessary for screwing on the lock nut require the machining of the holding rod from a blank which has at least the outer diameter of the sealing collar.
  • the resulting material loss during processing is of the order of 50%. In particular, it therefore represents a significant cost factor represents, because the service life of the support rod is relatively short, in particular due to rapid scaling in the lower area exposed to the strongest temperature.
  • the invention has for its object to further develop a generic arrangement so that it is simpler and cheaper to manufacture and more economical to use and that a worn plug rod can be replaced by a new one in a few simple steps.
  • the support rod By dividing the support rod into a lower part protruding into the stopper rod and an upper part that can be attached to the lever mechanism and using a quick coupling device with which the two parts of the support rod can be firmly and gas-tightly connected to one another, worn stopper rods together with the lower part of the Easily replace the handrail.
  • the lower part of the stopper rod is intended for single use, material can be saved in comparison with previous embodiments. Since the lower part of the handrail, in particular, is exposed to high thermal loads, it scales after a short period of use.
  • the entire holding rod had to be replaced by a new one, the upper part, which is more complex to manufacture, remains usable for a considerably longer time due to the division of the holding rod.
  • the support rod is particularly economical to produce if it is made from a metal material according to claim 2.
  • the part of the holding rod which is connected to the stopper rod is only intended for single use, in the preferred embodiment it is made of a low-alloy steel.
  • a preferred embodiment of the quick coupling device is the subject of claim 5. It is formed in that a conical sealing surface is arranged on the lower end face of the upper part of the support rod, over which extends a union nut which forms a peripheral projection and which extends with a from the upper end of the lower part of the support rod over a certain length extending thread can be brought into engagement and with which the lower part of the support rod with its upper end face forming the counter-sealing surface can be pressed into the conical sealing surface.
  • a particularly good sealing effect is achieved if, according to claim 6, the surface of the upper face of the lower part of the support rod forming the counter-sealing surface has an upward curvature such that the sealing contact surface of the upper face of the lower part of the support rod and the lower end of the upper part of the support rod has the shape of a closed circular line.
  • the engagement means consist of a plurality of successive all-round grooves and all-round webs formed at the lower end of the support rod and one or more, approximately parallel to the longitudinal axis the arrangement of extending key surfaces exist, which are in engagement with all-round grooves and webs formed in the upper part of the longitudinal recess of the stopper rod and one or more flat projections, thereby forming a labyrinth seal between the two parts, which means that the material-intensive shaping of a sealing collar can be dispensed with.
  • a particularly good sealing effect of the connection can be produced if, according to claim 13, at least one of the all-round grooves of the lower part of the holding rod carries a flexible, fire-resistant sealing ring which interacts with an all-round web of the stopper rod.
  • the already firm, substantially gas-tight fit of the holding rod in the stopper rod can be further improved in the case of particularly high requirements, according to claim 14, in that the lower part of the retaining rod has an external thread extending upwards from the upper end face of the stopper rod for a certain length has, from above a nut which is provided on the end face by means of a thrust washer provided between the nut and the upper end face of the stopper rod, so that the upper flanks of the all-round webs of the lower part of the holding rod are pressed against the lower flanks of the all-round webs of the stopper rod will.
  • the area between the lower end of the external thread and the upper all-round web of the handrail can serve elastic absorption of longitudinal stresses if, according to claim 15, the distance between the lower end of the external thread and the upper all-round web is at least 1.4 times the external diameter of the non-profiled part of the holding rod projecting into the stopper rod.
  • a method which is particularly suitable for producing a device according to one of the previous claims is the subject of claim 18.
  • a secure, non-detachable and essentially sealing seat of the holding rod in the stopper rod is achieved in that the holding rod is pressed into the stopper rod during isostatic pressing such that the engagement means of the support rod are completely surrounded by the ceramic material which engages in them and that the plug rod is burned together with the support rod after the isostatic pressing.
  • the information refers to the hanging operating position of the device shown in FIGS. 1 and 3.
  • the arrangement designated 100 in the drawing as a whole consists of a two-part, metallic holding rod 10, 10 ', the lower part 1, 1' of which protrudes over a certain length into the refractory, ceramic plug rod 2.
  • a plurality of successive all-round grooves 3, 3 'and all-round webs 4, 4' and a key surface 35 running parallel to the longitudinal axis L of the arrangement 100 are arranged in the region of the lower part 1, 1 'of the holding rod 10, 10' projecting into the stopper rod 2.
  • connection is further increased by the fact that in one of the all-round grooves 3,3 'of the lower part 1, 1' of the holding rod 10, 10 'a flexible, refractory sealing ring 36 is used, which cooperates with an all-round web 6 of the plug rod 2.
  • the lower part 1, 1 'of the holding rod 10, 10' comprises an external thread 41, which extends upwards over a certain length from the upper end face 40 of the plug rod 2, onto which an upper thread extends from above by means of a nut 38, 38 'and the upper end face 40 of the stopper rod 2 provided pressure plate 37.37 'on the end face 40 supporting nut 38.38' is screwed so that the upper flanks 43.43 'of the all-round webs 4.4' of the lower part 1.1 'of the support rod 10.10 ' are pressed against the lower flanks 42 of the all-round webs 6 of the plug rod.
  • the area between the lower end of the external thread 41 and the upper end of the all-round webs 4, 4 'of the lower part 1, 1' of the holding rod 10, 10 ', the length of which corresponds to at least its 1.4 times the external diameter, serves for the elastic absorption of longitudinal stresses, which occur in particular due to the tightening of the nut 38, 38 'and change in strength due to the effect of temperature on the arrangement.
  • a longitudinal recess 8 continues in the plug rod 2, which serves to supply gas to the gas outlet channels, which are arranged in the lower part of the plug rod 2 and are not shown in the drawing.
  • the lower part 1 of the holding rod 10 extending upwards in the direction of the longitudinal axis L above the plug rod 2 is provided with two mutually parallel flat flats 9, 11 or with a circular recess 12 which corresponds to the Attack a wrench or a hook wrench.
  • An outer thread 14 extends downward over a certain length from the upper end face 13 of the lower part 1 of the holding rod 10, which is designed as a conical, annular sealing surface and which can be brought into engagement with an inner thread 16 arranged in a union nut 15.
  • the union nut 15 which has a step-like reduction in its inner diameter in its upper region and thus comprises an annular bearing surface 17, is pushed onto the upper part 18 of the holding rod 10 from above and is supported on a circumferential projection arranged near the lower ends of the upper part 18 of the holding rod 10 19 from.
  • the lower end face 20 of the upper part 18 of the holding rod 10 forms the counter-sealing surface to the annular sealing surface on the end face 13 of the lower part 1 of the holding rod 10 and has an upward curvature such that the sealing contact surface of the upper end face 13 of the lower part 1 of the support rod 10 and the lower end face 20 of the upper part 18 of the support rod 10 has the shape of a closed circular line.
  • the two parts 1, 18 of the holding rod 10 can be connected to one another in a fixed and sealing manner, so that at the connection point 21 no gas from which extends along the longitudinal axis L through the entire holding rod 10 extending gas channel 22 can penetrate to the outside.
  • the upper part 18 of the holding rod 10 is provided with an external thread 23, which is used to attach the arrangement 100 to a lifting device arranged on the outside of the tundish and used to displace the arrangement.
  • two parallel, opposite recesses 25, 25 'of semicircular cross section running perpendicular to the longitudinal axis L are machined into the outer circumference of the lower part 1' of the holding rod 10 'at a certain distance from the end face 24.
  • an all-round groove 26 is provided in the lower part 1', which is used to hold a sealing ring 27 made of temperature-resistant glass fiber material, graphite or metal.
  • the upper part 18 'of the holding rod 10' is formed by a rod provided with an external thread 23 'from its upper side over a certain length, on the bottom of which a sleeve-shaped one Extension 29 molded in one piece or pushed over an area not provided with a thread and connected on its upper side by means of a circumferential weld seam 30 to the upper part 18 'of the holding rod 10'.
  • the part of the extension 29 which extends beyond the lower end face 31 is formed on the inside in such a way that the upper end of the lower part 1 'of the holding rod 10' can be pushed into the extension 29, forming a sliding fit, which is indicated by an inside at the lower end of the extension arranged chamfer is facilitated.
  • the extension 29 has in its area projecting beyond the end face 31 two mutually parallel bores 33, 33 'arranged perpendicular to the longitudinal axis L, the spacing of which from one another - based on the center of the bores - corresponds exactly to the inside diameter of the extension 29 and which in the inserted state of the lower Communicate part 1 'with the recesses 25, 25'.
  • the lower part 1 ' is inserted into the sleeve-shaped extension 29 of the upper part 18' of the holding rod 10 'and through a U-shaped, with the open ends of its legs in the bores 33,33 'insertable and engaging in the recesses 25,25' securing bracket 34 secured against slipping out. This makes it easy to replace a worn plug rod without the use of tools.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Gasket Seals (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Press Drives And Press Lines (AREA)
EP94912483A 1993-04-26 1994-04-25 Anordnung zur verbindung einer stopfenstange für ein metallurgisches gefäss mit ihrer hebevorrichtung und für die anordnung geeignete stopfenstange sowie verfahren zur herstellung der anordnung Expired - Lifetime EP0696238B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4313427 1993-04-26
DE4313427A DE4313427C1 (de) 1993-04-26 1993-04-26 Anordnung zur Verbindung einer Stopfenstange für ein metallurgisches Gefäß mit ihrer Hebevorrichtung und für die Anordnung geeignete Stopfenstange sowie Verfahren zur Herstellung der Anordnung
PCT/DE1994/000452 WO1994025204A1 (de) 1993-04-26 1994-04-25 Anordnung zur verbindung einer stopfenstange für ein metallurgisches gefäss mit ihrer hebevorrichtung und für die anordnung geeignete stopfenstange sowie verfahren zur herstellung der anordnung

Publications (2)

Publication Number Publication Date
EP0696238A1 EP0696238A1 (de) 1996-02-14
EP0696238B1 true EP0696238B1 (de) 1997-03-12

Family

ID=6486261

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94912483A Expired - Lifetime EP0696238B1 (de) 1993-04-26 1994-04-25 Anordnung zur verbindung einer stopfenstange für ein metallurgisches gefäss mit ihrer hebevorrichtung und für die anordnung geeignete stopfenstange sowie verfahren zur herstellung der anordnung

Country Status (12)

Country Link
US (1) US5681497A (cs)
EP (1) EP0696238B1 (cs)
JP (1) JP3266263B2 (cs)
KR (1) KR960701716A (cs)
BR (1) BR9406277A (cs)
CZ (1) CZ282555B6 (cs)
DE (2) DE4313427C1 (cs)
ES (1) ES2098931T3 (cs)
HU (1) HU217931B (cs)
NO (1) NO306607B1 (cs)
PL (1) PL177977B1 (cs)
WO (1) WO1994025204A1 (cs)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9613810D0 (en) * 1996-07-02 1996-09-04 Foseco Int Stopper rod
GB9917888D0 (en) * 1999-07-30 1999-09-29 Foseco Int Stopper rod
JP3831168B2 (ja) * 2000-01-19 2006-10-11 株式会社シマノ 魚釣り用リールのドラグ座金及びそれを用いた魚釣り用リール
GB0507939D0 (en) * 2005-04-20 2005-05-25 Foseco Int Stopper red
AT524495A1 (de) * 2020-10-09 2022-06-15 Sheffield Hi Tech Refractories Germany Gmbh Stopfen
CN115106518B (zh) * 2022-05-31 2023-06-27 山东汇金股份有限公司 一种底注式浇包塞杆提升用联接器

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1004740A (en) * 1908-09-22 1911-10-03 Peabody A Brown Electric alarm.
US2005311A (en) * 1934-07-06 1935-06-18 American Sheet & Tin Plate Stopper rod for ladles
GB1004740A (en) * 1962-07-05 1965-09-15 Morganite Res & Dev Ltd Improvements in and relating to metal pouring ladle nozzle stopper
BE635142A (cs) * 1962-12-14
US3331539A (en) * 1966-09-08 1967-07-18 Southwire Co Metering device for controlling molten metal flow
US3632026A (en) * 1969-01-27 1972-01-04 Vesuvius Crucible Co Stopper structure and combination of bottom pour receptacle and stopper
US3848781A (en) * 1973-02-20 1974-11-19 J Springer Quick release stopper rod for steel mill ladle
US4271994A (en) * 1979-11-09 1981-06-09 Combustion Engineering, Inc. Flex rod assembly for a stopper valve in a bottom pour ladle
US4946083A (en) * 1988-12-29 1990-08-07 Vesuvius Crucible Company One-piece stopper rod
DE4040189C1 (en) * 1990-12-15 1992-01-02 Didier-Werke Ag, 6200 Wiesbaden, De Ceramic plug for outlet from metallurgical vessel - has supporting pipe with annular space to form sealing face, and nut is screwed onto it through which gas is delivered
DE4212450A1 (de) * 1991-11-26 1993-05-27 Didier Werke Ag Einrichtung zum halten eines stopfens und stopfen

Also Published As

Publication number Publication date
JP3266263B2 (ja) 2002-03-18
NO954251D0 (no) 1995-10-24
HUT73478A (en) 1996-08-28
KR960701716A (ko) 1996-03-28
US5681497A (en) 1997-10-28
NO306607B1 (no) 1999-11-29
PL311200A1 (en) 1996-02-05
HU9503071D0 (en) 1995-12-28
NO954251L (no) 1995-12-22
WO1994025204A1 (de) 1994-11-10
EP0696238A1 (de) 1996-02-14
DE4313427C1 (de) 1994-08-18
CZ282555B6 (cs) 1997-08-13
BR9406277A (pt) 1996-01-02
DE59402078D1 (de) 1997-04-17
CZ265095A3 (en) 1996-02-14
ES2098931T3 (es) 1997-05-01
JPH08509424A (ja) 1996-10-08
HU217931B (hu) 2000-05-28
PL177977B1 (pl) 2000-02-29

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