EP1372892B1 - Verfahren zum reparieren einer rissbeständigen schieberplatte und reparierte schieberplatte - Google Patents

Verfahren zum reparieren einer rissbeständigen schieberplatte und reparierte schieberplatte Download PDF

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Publication number
EP1372892B1
EP1372892B1 EP02704500A EP02704500A EP1372892B1 EP 1372892 B1 EP1372892 B1 EP 1372892B1 EP 02704500 A EP02704500 A EP 02704500A EP 02704500 A EP02704500 A EP 02704500A EP 1372892 B1 EP1372892 B1 EP 1372892B1
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EP
European Patent Office
Prior art keywords
plate
rectangle
edges
diagonal
intersecting
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Expired - Lifetime
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EP02704500A
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English (en)
French (fr)
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EP1372892A1 (de
Inventor
Giampiero Di Domenico
Fabrizio Florio
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Vesuvius Crucible Co
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Vesuvius Crucible Co
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Priority to EP02704500A priority Critical patent/EP1372892B1/de
Priority to DK02704500T priority patent/DK1372892T3/da
Publication of EP1372892A1 publication Critical patent/EP1372892A1/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
    • B22D41/22—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
    • B22D41/28—Plates therefor
    • B22D41/30—Manufacturing or repairing thereof
    • 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
    • B22D41/28—Plates therefor

Definitions

  • This invention generally relates to a process for repairing worn valve plates for use in slide gate valves for controlling a flow of molten metal, and specifically for a valve plate that is resistant to cracks caused from thermomechanical stresses.
  • Slide gate valves are commonly used to control a flow of molten metal in steel making and other metallurgical processes.
  • Such valves generally comprise a support frame, an upper stationary valve plate having an orifice in registry with a tundish or ladle nozzle for conducting a flow of molten metal, and a throttle plate likewise having a metal conducting orifice that is slidably movable under the stationary valve plate.
  • a lower stationary valve plate is provided beneath the movable throttle plate which likewise has a flow conducting orifice that is substantially aligned with the orifice of the upper stationary plate.
  • the rate of flow of molten metal is dependent upon the degree of overlap of the orifice of the slidably movable throttle plate with the orifice of the upper stationary plate.
  • the movable throttle plate is usually longer than the stationary throttle plate in order to give it the capacity of throttling the flow of molten metal from both the front and back edges of its own orifice, as well as the ability to shut off the flow altogether by bringing its orifice completely outside of any overlap with the orifices of the stationary plate.
  • the throttle plate is slidably manipulated between the stationary plates by means of a hydraulic linkage.
  • the throttle plate and the stationary plate are mounted in respectively a lower indentation and an upper indentation, each of these plates resting in an indentation through a surface that becomes its support surface and cooperating with the other plate through a surface that becomes its sliding or working surface.
  • Both the throttle plate and the stationary plates of such slide gate valves are formed from heat and erosion resistance refractory materials, such as aluminum oxide, alumina-carbon, zirconium oxide.
  • heat and erosion resistance refractory materials such as aluminum oxide, alumina-carbon, zirconium oxide.
  • each valve plate is subjected to temperatures of approximately 1600°C in the area immediately surrounding its flow-conducting orifice, while its exterior edges are experiencing only ambient temperature.
  • the resulting large thermal gradient creates large amounts of thermomechanical stress as the area of each plate immediately surrounding its orifice expands at a substantially greater rate than the balance of the plate.
  • the clamping forces are not uniformly focused where the maximum amount of cracking occurs, i.e., in the vicinity of the orifice where the greatest amount of thermomechanical stresses are present.
  • the applicants have observed that, generally, the angular orientation of the truncated comers in such plates does not optimally prevent the spreading of cracks, as previously thought.
  • Such non-optimality results from the fact that crack formation is not uniformly distributed 360° around the orifice, but instead is biased along the longitudinal center line of all valve plates whether stationary or movable.
  • Such an asymmetrical distribution of cracks around the plate orifices is believed to occur as a result of the longitudinal sliding action of the throttle plate across the faces of the stationary plates.
  • the USP 5,626,164 discloses a crack resistant valve plate; the shape of said plate being designed to prevent the formation and spreading of cracks therein.
  • This plate has an axis, and an orifice for conducting molten metal that is positioned along said axis, and truncated corners for focusing a clamping force toward said axis in the vicinity of said orifice, wherein each of said truncated corners is orthogonal to a line extending between a tangent point to said orifice, across said axis, and through an intersection of lines drawn parallel to converging plate edges that are spaced from said edges a distance equal to one-half of a width of said orifice.
  • valve plate whose shape optimally focus the clamping forces in the most crack-prone areas of the plate in order to maximally retard the lengthening of any such cracks.
  • the corners should have a length sufficient to avoid the production of unwanted localized mechanical stresses in the corners.
  • the International Patent application WO01/41956 discloses a crack resistant valve plate assembly for use in a slide gate valve that overcomes or at least ameliorates all of the disadvantages associated with the prior art or that at least equals the performance of the plate disclosed in USP 5,626,164.
  • This document relates thus to a refractory plate for a slide gate valve which may be circumscribed by an elongated rectangle R having two sides parallel to the direction of its elongation.
  • the rectangle R has a longitudinal axis which is defined as its longest symmetry axis and that will coincide with the preferential sliding trajectory of the plate. It is however to be clearly understood that this concept of preferential sliding trajectory is an intrinsic characteristic of the plate according to this document and that this plate may be slid in a gate valve according to a direction which is not the optimal or preferential one.
  • the plate has an orifice - the pouring hole - for conducting molten metal. Most often said orifice is circular, more generally, it is circumscribed by a circle C of diameter ⁇ .
  • the rectangle R is divided into four quadrants by two perpendicular lines intersecting at the center of the circle C, one of these lines extending in the middle between the parallel sides of the rectangle R.
  • Each quadrant has intersecting diagonals: diagonals D1, D3, D5, D7 joining the center of the circle C to the corners of the rectangle R and diagonals D2, D4, D6 and D8 joining adjacent intersections of the perpendicular lines intersecting at the center of the circle C with the sides of the rectangle R.
  • the pouring hole may be centrally located in the plate, but most often, it is offset along the longitudinal axis so that throttling may be effected on a longer area.
  • the pouring hole may also be slightly offset along an axis perpendicular to the longitudinal axis.
  • the plate has angularly oriented edges - figuring the truncated corners of the rectangle R - for focusing clamping forces toward the vicinity of the orifice and toward the throttling area to prevent the formation and spreading of cracks therein.
  • the newly designed plate is extremely advantageous. Firstly, far less cracks are observed. Secondly, even if they still occur, the cracks do not spread up to the plate edges, so that air ingression is markedly reduced. And thirdly, when the plate according to this European application is used in combination with an appropriate clamping device, the cracks, if any, only occur in acceptable area. I.e., they do not occur in the throttling area, neither do they occur directly in the area between the pouring hole and the closest edges.
  • a further advantage of this plate is that since very few cracks have been observed, the plate can be easily and quickly repaired after having been used. This is why the present invention concerns a process for repairing the used plates disclosed in the WO01/41956.
  • the plate may be symmetrical with respect to its longitudinal axis, but in the preferred embodiment, the plate is not symmetrical with respect to the longitudinal axis.
  • the plate may only be mounted in one position in the upper indentation and in one position in the lower indentation so that the support surface of the plate becomes its sliding or working surface when the plate passes from one position to the other in case recycling of the plates is desirable.
  • the plate may have only four edges defined as above, but in order to avoid sharp angles, it may have more edges.
  • the supplemental edges may (or not) be parallel and/or perpendicular to the longitudinal axis.
  • the plate it must be understood that it is not mandatory that the plate be polygonal. On the contrary, in case a clamping band is used around the plate, such clamping band can apply localized mechanical stresses - which could turn into cracks - onto the vertex defined by adjacent edges. Therefore, it is advantageous that the corner be rounded.
  • edges only a portions of the edges satisfy the above definition. More preferably, the balance of the edges are comprised of curves joining the said edges portions and most preferably of transition radius of the said edges.
  • a "plate” means also a plate of an assembly (fixed or removable) such as a monobloc nozzle plate, a monobloc inner nozzle plate, a monobloc tube plate, etc.
  • the present invention concerns thus a process for repairing a worn refractory plate for a slide gate valve, which may be circumscribed by an elongated rectangle R having two sides parallel to the direction of its elongation and having a pouring hole positioned eccentrically in the middle between the parallel sides of the rectangle R and circumscribed by a circle C, the rectangle R being divided into four quadrants by two perpendicular lines intersecting at the center of the circle C, one of these lines extending in the middle between the parallel sides of the rectangle R, each quadrant having intersecting diagonals: D1, D2 and D3, D4 and D5, D6 and D7, D8, respectively, wherein the corners of the rectangle R are cut away and replaced by inclined edges and the direction of at least a portion of those edges which are farest from the pouring hole deviate at maximum 5° from the direction of the diagonal which does not intersect the respective corner; and
  • Any suitable repairing process could be used. It should be understood that it is precisely by virtue of its exceptional crack-resistance that these plates can be easily, quickly and efficiently repaired.
  • the repairing process comprises a step of patching the cracks with mortar, preferably with a mortar capable of resisting the molten steel such as a phosphatic mortar, for example REFRACOL 620 PL 45.
  • a mortar capable of resisting the molten steel such as a phosphatic mortar, for example REFRACOL 620 PL 45.
  • the excess of mortar is removed and the plate is allowed to dry. Drying can be carried out at ambient temperature for at least 4 hours, preferably at least 8 hours or in an oven for example at 120°C for 1 hour.
  • the plate can then be cured.
  • This curing step might be performed at 350-450°C during one hour.
  • curing can also occur during use of the repaired plate when it is subjected to high servicing temperatures.
  • the plate is preheated for example at about 80-120°C, so that the mortar penetrates deep into the cracks and sets quickly.
  • the mortar comprises a hardener so that, even at ambient temperature, it sets up quickly.
  • the pouring orifice In case the pouring orifice is damaged, it can also be repaired.
  • a tubular article such as a pipe, a rod or a mandrel
  • Mortar (generally the same as the one used for the cracks) is patched around the tubular object, dried and eventually cured.
  • a hole preferably coaxial with the original pouring orifice and having a diameter preferably at least 50% greater than the original diameter of the pouring orifice
  • the insert is preferably made of a material at least as resistant as the original material of the plate. It may be convenient to provide the external walls of the insert with protrusions or holes so that the mortar and the insert are interpenetrated. It is also possible to use stepped insert shaped as two (or more) superimposed coaxial tubes having the same inner diameter but different external diameters.
  • FIGS. 1 and 2 are top plan views of plates of WO-A1-01/41956.
  • valve plate 1 for use in a slide gate valve of the type used to regulate a flow of molten steel or other metal from a tundish to a mold or from a ladle to a tundish.
  • the plate 1 has an orifice 3 for pouring the molten metal stream. Said pouring hole 3 is circumscribed by a circle C of center 4 .
  • Fig. 1 illustrates a plate with a non circular pouring hole and Fig. 2 shows a plate with a pouring hole 3 corresponding to the circle C.
  • Rectangle R is visible on Figs. 1 and 2.
  • Rectangle R circumscribes plate 1 and has its longest sides parallel to the sliding trajectory of the plate in the slide gate valve.
  • Each quadrant has intersecting diagonals: D1, D3, D5 and D7 joining the center 4 of the circle C to the four corners (7, 8, 9, 10) of the rectangle R and D2, D4, D6 and D8 joining adjacent intersections (11, 12, 13, 14) of the lines 5 and 6 with the sides of the rectangle R.
  • edges of the plate specially designed to focus the clamping forces in the throttling area i.e. the edges 15 and 16 which are the farest from the pouring hole 3 , thus closest to the throttling area, have at least a portion (against which the clamping force will be applied) that is parallel to the diagonal D2 or D4 of the quadrant containing said edge.
  • edges of the plate which are specifically designed to focus the clamping forces around the pouring hole 3, i.e. the edges 17 and 18 which are the closest from the pouring hole 3 may be shaped perpendicular to the diagonals D5 or D7 of the quadrant containing said edge or, in other words, parallel to a direction 19 or 20 defined as a perpendicular to the diagonals D5 or D7.
  • This embodiment is illustrated on both edges 17 and 18 of Fig. 2 which are respectively perpendicular to diagonals D5 and D7.
  • edges 17 and 18 may be shaped parallel to the diagonals D6 or D8 of the quadrant containing them as is illustrated on edges 17 and 18 of Fig. 1 which are parallel to diagonals D6 and D8.
  • edges 17 and 18 may be oriented in a direction comprised between the two above defined directions.
  • edges 15, 16, 17 and 18 may contact each other, defining thus a tetragonal plate 1 , defined by the joint diagonals D2, D4, D6 and D8. Obviously, to avoid mechanical stresses, it is preferred to avoid such tip-shaped corners. Therefore, preferably, the edges 15, 16, 17 and 18 do not contact directly. They may be separated by straight lines, preferably parallel to the sides of the rectangle as illustrated on Fig. 1.
  • edges 15 and 16 and edges 17 and 18 are joined by transition radii 21 and 22.
  • the essential parameter is the orientation of the edges 15, 16, 17 and 18, which will determine the way they focus the clamping forces to avoid the cracks.
  • Their position with respect to the pouring hole 3, i.e. the position of the edges 15, 16, 17 and 18 along the respective diagonals D1, D3, D5 and D7 is less important for that criteria.
  • the edges 15, 16, 17 and 18 are not too long to avoid the mechanical stresses due to the tip-shaped comers, nor too short for efficiently focusing the clamping forces where it is necessary.
  • edges 15 and 16 should preferably cut the short side of the rectangle R in a region comprised respectively between 1/8 and 3/8 and between 5/8 and 7/8 of the length of the short side of the rectangle R.
  • edges 17 and 18 should preferably cut the short side of the rectangle R in a region comprised between 1/10 and 9/ 10 of the length of the short side of the rectangle R.

Claims (6)

  1. Verfahren zum Reparieren einer abgenutzten Feuerfestplatte (1) für einen Absperrschieber, umfassend einen Schritt eines Flickens der Risse mit Mörtel, dadurch gekennzeichnet, dass die Platte (1) durch ein längliches Rechteck R mit zwei zur Richtung seiner Längserstreckung parallelen Seiten umschrieben wird und eine Gießöffnung (3) aufweist, die exzentrisch in der Mitte zwischen den parallelen Seiten des Rechtecks R angeordnet ist und durch einen Kreis C mit der Mitte (4) umschrieben wird, wobei das Rechteck R durch zwei senkrechte Linien (5, 6), die sich in der Mitte (4) des Kreises C schneiden, in vier Quadranten unterteilt wird, wobei sich eine (6) dieser Linien (5, 6) in der Mitte zwischen den parallelen Seiten des Rechtecks R erstreckt, wobei jeder Quadrant sich schneidende Diagonalen D1, D2 und D3, D4 und D5, D6 bzw. D7, D8 aufweist, wobei die Ecken (7-10) des Rechtecks R weggeschnitten und durch schräge Ränder (15-18) ersetzt sind und mindestens ein Teil dieser Ränder (15, 16), die am weitesten von der Gießöffnung (3) entfernt sind, höchstens 5° von der Richtung der Diagonalen abweicht, welche die jeweilige Ecke nicht schneidet, wobei die Richtung der Ränder (17, 18), die der Gießöffnung (3) am nächsten sind, höchstens 5° von einer der folgenden Richtungen abweicht:
    (i) der Richtung, die senkrecht zu der Diagonalen ist, welche die jeweilige Ecke schneidet;
    (ii) der Richtung der anderen Diagonalen des jeweiligen Quadranten;
    (iii) einer zwischen den Richtungen (i) und (ii) liegenden Richtung.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Mörtel ein Phosphatmörtel ist.
  3. Verfahren nach Anspruch 1 oder 2, umfassend die weiteren Schritte:
    a) Bohren eines Lochs, das im Wesentlichen koaxial zur ursprünglichen Gießöffnung ist und einen Durchmesser aufweist, der mindestens 50 % größer als die ursprüngliche Gießöffnung ist,
    b) Einbringen eines Einsatzes in das gebohrte Loch
    c) Einbringen von Mörtel zwischen den Einsatz und die Wände des gebohrten Lochs.
  4. Verfahren nach einem der Ansprüche 1 bis 3, umfassend einen Schritt eines Trocknens der geflickten Platte.
  5. Verfahren nach einem der Ansprüche 1 bis 3, umfassend einen Schritt eines Aushärtens der geflickten Platte.
  6. Wiederaufgearbeitete Feuerfestplatte (1) für einen Absperrschieber, wobei die Risse der Platte mit Mörtel geflickt sind, dadurch gekennzeichnet, dass die Platte durch ein längliches Rechteck R mit zwei zur Richtung seiner Längserstreckung parallelen Seiten umschrieben wird und eine Gießöffnung (3) aufweist, die exzentrisch in der Mitte zwischen den parallelen Seiten des Rechtecks R angeordnet ist und durch einen Kreis C mit der Mitte (4) umschrieben wird, wobei das Rechteck R durch zwei senkrechte Linien (5, 6), die sich in der Mitte (4) des Kreises C schneiden, in vier Quadranten unterteilt wird, wobei sich eine (6) dieser Linien (5, 6) in der Mitte zwischen den parallelen Seiten des Rechtecks R erstreckt, wobei jeder Quadrant sich schneidende Diagonalen D1, D2 und D3, D4 und D5, D6 bzw. D7, D8 aufweist, wobei die Ecken (7-10) des Rechtecks R weggeschnitten und durch schräge Ränder (15-18) ersetzt sind und mindestens ein Teil dieser Ränder (15, 16), die am weitesten von der Gießöffnung (3) entfernt sind, höchstens 5° von der Richtung der Diagonalen abweicht, welche die jeweilige Ecke nicht schneidet, wobei die Richtung der Ränder (17, 18), die der Gießöffnung (3) am nächsten sind, höchstens 5° von einer der folgenden Richtungen abweicht:
    (i) der Richtung, die senkrecht zu der Diagonalen ist, welche die jeweilige Ecke schneidet;
    (ii) der Richtung der anderen Diagonalen des jeweiligen Quadranten;
    (iii)einer zwischen den Richtungen (i) und (ii) liegenden Richtung.
EP02704500A 2001-03-06 2002-03-04 Verfahren zum reparieren einer rissbeständigen schieberplatte und reparierte schieberplatte Expired - Lifetime EP1372892B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP02704500A EP1372892B1 (de) 2001-03-06 2002-03-04 Verfahren zum reparieren einer rissbeständigen schieberplatte und reparierte schieberplatte
DK02704500T DK1372892T3 (da) 2001-03-06 2002-03-04 Fremgangsmåde til reparation af en revnemodstandsdygtig ventilplade og repareret ventilplade

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP01870037 2001-03-06
EP01870037 2001-03-06
EP02704500A EP1372892B1 (de) 2001-03-06 2002-03-04 Verfahren zum reparieren einer rissbeständigen schieberplatte und reparierte schieberplatte
PCT/BE2002/000025 WO2002070173A1 (en) 2001-03-06 2002-03-04 Process for repairing a crack resistant valve plate

Publications (2)

Publication Number Publication Date
EP1372892A1 EP1372892A1 (de) 2004-01-02
EP1372892B1 true EP1372892B1 (de) 2005-05-25

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EP02704500A Expired - Lifetime EP1372892B1 (de) 2001-03-06 2002-03-04 Verfahren zum reparieren einer rissbeständigen schieberplatte und reparierte schieberplatte

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EP (1) EP1372892B1 (de)
JP (1) JP2004521746A (de)
KR (1) KR20030080076A (de)
CN (1) CN1525893A (de)
AT (1) ATE296176T1 (de)
AU (1) AU2002238307B2 (de)
BR (1) BR0207478A (de)
CA (1) CA2438967A1 (de)
DE (1) DE60204294T2 (de)
DK (1) DK1372892T3 (de)
ES (1) ES2239218T3 (de)
HU (1) HUP0303409A3 (de)
MX (1) MXPA03008113A (de)
PL (1) PL363265A1 (de)
PT (1) PT1372892E (de)
RU (1) RU2277455C2 (de)
TW (1) TW526315B (de)
UA (1) UA75633C2 (de)
WO (1) WO2002070173A1 (de)
ZA (1) ZA200306068B (de)

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JP4456363B2 (ja) 2003-12-16 2010-04-28 東京窯業株式会社 スライディングノズル用プレート
DE102004050702B3 (de) * 2004-10-18 2006-02-02 Refractory Intellectual Property Gmbh & Co. Kg Schieberplatte
EP1870183A1 (de) * 2006-06-19 2007-12-26 Vesuvius Group S.A Plattensatz und Schiebeplatten für Wechseleinrichtung für metallurgisches Gefäss und Herstellungsverfahren dazu
KR101520038B1 (ko) * 2014-02-06 2015-05-13 포항공과대학교 산학협력단 슬라이드 게이트 및 슬라이드 게이트용 밸브판
TWI717455B (zh) * 2016-01-25 2021-02-01 比利時商維蘇威集團股份有限公司 滑動閘閥板、金屬殼及滑動閘閥
KR101930748B1 (ko) 2017-08-02 2018-12-19 주식회사 포스코 주조용 슬라이딩 게이트
CN113134600B (zh) * 2021-04-26 2023-02-17 济南新峨嵋实业有限公司 一种滑板砖修复方法

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Publication number Priority date Publication date Assignee Title
EP2481500A1 (de) * 2011-01-31 2012-08-01 Stopinc Aktiengesellschaft Verschlussplatte sowie ein Schiebenverschluss am Ausguss eines Metallschmelze enthaltenden Behälters
WO2012104028A1 (de) * 2011-01-31 2012-08-09 Stopinc Aktiengesellschaft Verschlussplatte sowie ein schiebeverschluss am ausguss eines metallschmelze enthaltenden behälters
TWI615218B (zh) * 2011-01-31 2018-02-21 史托賓克公司 閉合板以及熔融金屬容裝容器流槽上的滑動閉合件

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UA75633C2 (en) 2006-05-15
AU2002238307B2 (en) 2006-06-22
KR20030080076A (ko) 2003-10-10
ES2239218T3 (es) 2005-09-16
DE60204294T2 (de) 2006-02-02
RU2277455C2 (ru) 2006-06-10
MXPA03008113A (es) 2003-12-12
PL363265A1 (en) 2004-11-15
HUP0303409A3 (en) 2004-04-28
WO2002070173A1 (en) 2002-09-12
DK1372892T3 (da) 2005-09-26
ZA200306068B (en) 2004-08-06
HUP0303409A2 (hu) 2004-01-28
BR0207478A (pt) 2004-06-01
CN1525893A (zh) 2004-09-01
ATE296176T1 (de) 2005-06-15
RU2003125180A (ru) 2005-02-27
CA2438967A1 (en) 2002-09-12
EP1372892A1 (de) 2004-01-02
PT1372892E (pt) 2005-10-31
TW526315B (en) 2003-04-01
DE60204294D1 (de) 2005-06-30
JP2004521746A (ja) 2004-07-22

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