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WO1997033712A1 - Vanne a obturateur coulissant - Google Patents

Vanne a obturateur coulissant Download PDF

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Publication number
WO1997033712A1
WO1997033712A1 PCT/GB1997/000680 GB9700680W WO9733712A1 WO 1997033712 A1 WO1997033712 A1 WO 1997033712A1 GB 9700680 W GB9700680 W GB 9700680W WO 9733712 A1 WO9733712 A1 WO 9733712A1
Authority
WO
WIPO (PCT)
Prior art keywords
plate
sliding
orifice
gate valve
sliding gate
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.)
Ceased
Application number
PCT/GB1997/000680
Other languages
English (en)
Inventor
Colin Ian Mcnair
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.)
Flogates Ltd
Original Assignee
Flogates Ltd
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 Flogates Ltd filed Critical Flogates Ltd
Priority to AU19335/97A priority Critical patent/AU1933597A/en
Publication of WO1997033712A1 publication Critical patent/WO1997033712A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • B22D41/28—Plates therefor
    • 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
    • B22D41/24—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 characterised by a rectilinearly movable plate

Definitions

  • This invention relates to sliding gate valves for controlling the flow of molten metal through the tap hole of a vessel, and more particularly to a sliding gate valve having an improved performance and/or improved working lifetime.
  • valves for liquid metal-containing vessels for example, ladles and tundishes
  • the valves typically comprise a refractory sliding gate plate having at least one teeming orifice, biased upwardly against a refractory top plate containing an orifice which communicates via a taphole with the interior of a vessel to which it is fixed.
  • Illustrative of such valves are those disclosed in British Patents Nos 1602716, 1602717 and 2110342, the entire disclosures of which are incorporated herein by reference for all purposes.
  • Molten metal flow from the vessel is controlled by sliding the sliding gate plate against the top plate, usually by means of a reciprocating ram.
  • the orifice in the fixed top plate which communicates with the interior of the vessel cooperates with the teeming orifice of the sliding gate plate when the two orifices are slid into registry.
  • the sliding gate plate usually bears a collector nozzle (or bushings for the attachment of a collector nozzle) to permit controlled pouring of molten metal in a compact stream.
  • Metal flow can therefore be turned on or off by sliding the teeming orifice in the sliding gate plate into or out of registry with the orifice in the top plate, respectively.
  • the molten metal flow can also be throttled by bringing the sliding plate orifice partly into registry with the stationary top plate orifice, adjustment being provided by sliding the sliding gate plate to give greater or lesser metal flow (the throttling position). In this manner, the rate of flow of the metal stream issuing from the collector nozzle can be controlled.
  • the sliding plate In order to maintain the seal between the plates, the sliding plate is biased towards the fixed top plate.
  • the magnitude of the biasing force is determined to be a balance between being low enough so that the sliding plate can slide over the fixed plate without excessive wear, whilst being high enough to prevent molten metal ingress between the plates. Spring weakening, plate wear and other operational factors can, however, cause some plate separation to occur thereby allowing molten metal ingress between the plates.
  • the present invention seeks to provide a sliding gate valve with a relatively long working life which is suitable for applications where down time must be minimized.
  • a sliding gate valve for controlling the flow of molten metal from a vessel, the valve comprising an orificed fixed plate and an orificed sliding plate slidingly mounted on a support frame, the frame being hingedly movable between an operating position where the sliding plate is in face to face contact with the fixed plate and another position moved therefrom, the sliding plate being biased into said face to face contact by spring means removable from the valve whilst the frame is in its assembled position.
  • a sliding gate valve for controlling the flow of molten metal from a vessel, the valve comprising an orificed fixed plate and an orificed sliding plate slidably mounted on a support frame, the support frame being hingedly movable between an operating position where the sliding plate is in face to face contact with the fixed plate along a contact plane and another position displaced therefrom, the sliding plate being biased into said face to face contact by biasing means which exerts biasing force directly onto the contact plane.
  • UK Patent Application No 13920 discloses refractory plates for controlling flow of molten metal material arranged so that a uniform controllable variable sealing pressure can be applied over the entire of the sliding plate surface which surrounds a depending nozzle to prevent ingress of molten metal material between the plates.
  • a sliding refractory- plate and depending refractory nozzle can be shifted into alignment with the orifice of a fixed refractory plate to allow teeming.
  • the sliding refractory plate can then be shifted further towards either side of the orifice in the fixed refractory plate to first throttle the stream of molten material and then to completely shut off the stream and thus stop teeming.
  • the teeming position and throttling position of the sliding gate valve of UK Patent Application Number 8313920 are disposed on the same side of the orifice in the fixed refractory plate.
  • both sides of the sliding refractory plate are used for teeming, the mechanical abrasion and chemical erosion to which the refractory plates are subjected will result in rapid erosion of the regions surrounding the orifice in the sliding refractory plate and, again, lead to the need for replacement on a frequent basis.
  • throttling using both sides of the orifice in the fixed sliding refractory plate leads to the need for a relatively large sliding refractory plate.
  • a sliding gate valve wherein the sliding plate can travel between both sides of the fixed plate orifice. This permits throttling to be carried out on one side only of the valve, leaving relatively unworn surfaces on the opposite side for shut off.
  • the invention provides a sliding gate valve wherein, in the shut off position, the area of contact of the fixed plate and sliding plate surfaces around the orifice in the fixed plate extends in all directions to a distance at least as great as the diameter of the orifice, for at least a substantial part of the service life of the valve.
  • the present invention provides a sliding gate valve having a fully open position, a shut off (closed) position and a throttling position, the valve comprising:
  • a fixed refractory plate having a first orifice disposed therein, a sliding refractory plate having a second, teeming orifice disposed therein, and
  • control system adapted to move the sliding plate in a controlled manner between the fully open position, the shut off position and the throttling position, such that
  • shut off position and the throttling position of the sliding plate are always disposed on opposed sides of the fully open position.
  • the invention provides a method of operating a sliding gate valve, the valve comprising a fixed refractory plate having a first orifice disposed therein and a sliding refractory plate having a second, teeming orifice disposed therein, in which the sliding plate is moved between a fully open position, in which the first and second orifices are in register, a shut off (closed) position, and a throttling position, such that the shut off position and the throttling position are always on opposed sides of the fully open position.
  • the invention provides a sliding gate valve having a fully open position, a shut off position and a throttling position, wherein the valve comprises:
  • a fixed refractory plate having a first orifice disposed therein
  • a sliding refractory plate having a second, teeming orifice disposed therein
  • At least one of the first and second orifices being asymmetrically disposed with respect to its respective plate in the direction of travel of the sliding plate so as to divide the length of the said respective plate into a greater portion and a lesser portion, and
  • control system adapted to move the sliding plate in a controlled manner between the fully open position, the shut off position and the throttling position, such that
  • shut off position and the throttling position of the sliding plate are on opposed sides of the fully open position, and wherein the greater portion of the length of the plate with the asymmetrically disposed orifice, between the said orifice and the further end of the plate, is accommodated adjacent the shut off position side of the valve.
  • the invention provides a refractory plate for a sliding gate valve, the plate being substantially elongate, with at least two elongate, substantially parallel sides and having an orifice with a bore diameter D disposed asymmetrically with respect to the length of the plate so as to divide the length into a greater portion and a lesser portion, the length of the greater portion, between the orifice and the further end of the plate, being at least 3.7D, and the width of the plate being at least 3D.
  • the sliding plate is slidably mounted on a support frame, the support frame being hingedly moveable between an operating position where the sliding plate is in face to face contact with the fixed plate and another position displaced therefrom.
  • Embodiments of such a valve are described and claimed in UK Patent Applications Nos.9509014.8 and 9509013.0 the entire disclosures of which are incorporated herein by reference for all purposes.
  • the sliding plate is biased into said face to face contact by biasing means which exert a biasing force directly onto the contact plane.
  • sliding plate is biased into said face to face contact by spring means removable from the valve whilst the frame is in its assembled position.
  • the biasing means are so arranged that the biasing force is applied only over the area of face to face contact of the fixed and sliding plates, whatever the position of the sliding plate.
  • This can be achieved, for example, by the use of spring means which exerts a biasing force against a load beam which is in contact with the sliding plate only over that area of the sliding plate which is always in face to face contact with the fixed plate.
  • an embodiment provides a sliding gate valve, wherein the biasing means is arranged to var; the biasing force according to the relative positions of the fixed and sliding plates.
  • the biasing force is arranged to increase with increasing registry of the fixed and sliding plate orifices.
  • the amount of throttling is restricted to no more than 70% of the full bore. It has been found that when this throttling value is exceeded, multiple impingement of the steel stream and collector bore can occur, which may produce excessive erosion, stream deflection, and break up.
  • 70% maximum throttling restriction equates to approximately 50 mm of sliding gate stroke.
  • At least the sliding refractory plate of the sliding gate valve of the present invention is provided with a teeming orifice disposed asymmetrically therein, in order to provide a greater portion of the length of the plate, between the orifice and the further end of the plate, which is available for shut off of the metal stream.
  • throttling is a procedure which is likely to be carried out throughout the teeming stage, and is therefore more likely to lead to erosion of the sliding plate than shut off, which, in normal circumstances, will be required only occasionally. Nevertheless, a clean shut off is more difficult to achieve if the surfaces have begun to erode and are no longer in contact. It can be seen, therefore, that the sliding plate of the present invention provides a greater proportion of its length which is available for shut off, thus leading to longer life overall.
  • both the fixed and the sliding plates of the sliding gate valve of the invention are provided with asymmetrically disposed orifices, which can, for example, each be situated at a distance equivalent to at least 3.7D from the further end of their respective plates, where D is the maximum bore diameter of the fixed plate orifice.
  • Figure 1 shows a sliding plate and a fixed plate of a sliding gate valve in accordance with the invention in sectional side elevation, in the shut off, teeming (open), and throttling positions;
  • FIG. 1 shows the fixed and sliding plates of
  • Figure 1 in the shut off, teeming (open) and throttling positions, in plan view;
  • Figure 3 shows a sliding plate for a sliding gate valve in accordance with the invention in sectional side elevation and in plan view
  • Figure 4 shows a side elevational view of the fixed and sliding plates and illustrates the position of the bias springs and the load beam
  • Figure 5 is a block diagram of the control system for the sliding gate valve.
  • Figure 1 shows a fixed plate 1, having an asymmetrically disposed orifice 2 therein, and a sliding plate 3 having a second asymmetrically disposed teeming orifice 4 therein.
  • the orifices 2 and 4 are disposed such that the distance between the centre of the orifice and the end of the greater length of the plate, and the centre of the orifice and the end of the lesser length of the plate are in the ratio of 1.0 : 0.52. It has been found, for practical purposes, that the preferred ratio of the greater to lesser lengths of the fixed and sliding plates lies in the range of 1.0 : 0.4 to 1.0 : 0.6.
  • the fixed and sliding plates 1 and 3 are arranged such that the greater length of the one is adjacent to the lesser length of the other, respectively.
  • the area of overlap 22 is reduced to 54.14D 2 , and it is this area which, in accordance with a further aspect of the invention, is designated as the area over which the spring bias force is applied.
  • a further advantage of providing the bias force only over the area of overlap is that there is no overhang load which could reduce the effective sealing load and/or result in cracking of the sliding plate around the fixed plate edge contact point.
  • the sliding plate illustrated generally at 10, comprises a sliding refractory plate 11 provided with an erosion resistant insert 12, having a teeming orifice 13, located asymmetrically with respect to the plate 11.
  • a collector nozzle 14 mounted on the plate 11 is a collector nozzle 14 having an orifice 15 aligned with the teeming orifice 13 in the insert 12.
  • the plate 11 and the base of the collector nozzle 14 are surrounded by a metal gate can 16.
  • the sliding plate is shown in plan view with the shut off 17 and maximum throttling positions 18 of the orifice 13 illustrated by broken lines.
  • the maximum throttling position is arranged such that it falls within the outer diameter of the erosion resistant insert 12.
  • the minimum diameter of the erosion resistant insert is greater than 2.4D, and is preferably 2.5D.
  • the width of the sliding plate (and of the fixed plate) is such that it is at least 3D, where D is the diameter of the orifice 13. This permits the orifice 13 to be disposed such that the width of plate contact 19 on each side of the orifice is at least equal to D.
  • the sliding plate 30 is shown supported on a load beam 31.
  • the sliding plate 30 is biased against the fixed plate 32 by means of bias springs 33.
  • the load beam 31 has upper bearing surfaces
  • Figure 5 illustrates diagrammatically the control system for the sliding gate stroke mechanism.
  • the action of the programmable logic controller 40 on commencing teeming is to activate a hydraulic cylinder 41, connected to a hydraulic unit 42, to move the sliding gate to the fully open position.
  • This position can be accurately determined, for example, using a linear transducer, or similar means, fitted to the hydraulic cylinder 41.
  • the sliding plate is moved over centre by the hydraulic cylinder 41 and controlled by the programmable logic controller 40, resulting in a throttling action.
  • the amount of throttling is restricted by 70% of full bore, based on a maximum bore size of 70mm. As previously stated, this 70% throttling value equates to approximately 50mm of sliding gate stroke.
  • Air ingress in a sliding gate system is always a problem when any degree of throttling is undertaken.
  • the resultant turbulence mixes the air with the steel causing them to combine and thereby downgrading the steel quality. By limiting the extent of the throttling this mixing is reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sliding Valves (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

Vanne à obturateur coulissant qui présente une position totalement ouverte, une position fermée et une position d'étranglement, et qui comprend: une plaque réfractaire fixe (1) comportant un premier orifice (2), une plaque réfractaire coulissante (3) comportant un second orifice, qui est un orifice de coulée (4), et un système de commande conçu pour faire passer la vanne, d'une manière contrôlée, de la position totalement ouverte à la position fermée et à la position d'étranglement. La position fermée et la position d'étranglement de la vanne se situent sur les côtés opposés de la position totalement ouverte.
PCT/GB1997/000680 1996-03-12 1997-03-12 Vanne a obturateur coulissant Ceased WO1997033712A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU19335/97A AU1933597A (en) 1996-03-12 1997-03-12 Sliding gate valve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9605223A GB2311947A (en) 1996-03-12 1996-03-12 Sliding gate valve
GB9605223.8 1996-03-12

Publications (1)

Publication Number Publication Date
WO1997033712A1 true WO1997033712A1 (fr) 1997-09-18

Family

ID=10790273

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/000680 Ceased WO1997033712A1 (fr) 1996-03-12 1997-03-12 Vanne a obturateur coulissant

Country Status (4)

Country Link
AU (1) AU1933597A (fr)
GB (1) GB2311947A (fr)
WO (1) WO1997033712A1 (fr)
ZA (1) ZA972117B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004098817A1 (fr) * 2003-05-07 2004-11-18 Equipment Merchants International, Inc. Element d'arret coulissant d'ecoulement metallique dans un processus de coulage
US8371476B2 (en) 2009-11-02 2013-02-12 Lincoln Global, Inc. Bulk bag with gate valve assembly
CN114587424A (zh) * 2022-03-02 2022-06-07 深圳市华晨阳科技有限公司 一种唾液样品采集装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU4866199A (en) * 1999-07-01 2001-01-22 Vesuvius Crucible Company Soft-bore monoblock pouring tube
US11767920B2 (en) * 2019-02-28 2023-09-26 Vesuvius Group, S.A. Sliding gate valve comprising a carriage

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3764042A (en) * 1972-08-03 1973-10-09 United States Steel Corp Reciprocable slidable gate with rotating slide element
US4076153A (en) * 1974-10-24 1978-02-28 Metacon Ag Plate structure for a liquid metal container closure
US4415103A (en) * 1979-09-07 1983-11-15 Uss Engineers And Consultants, Inc. Full throttle valve and method of tube and gate change
GB2122315A (en) * 1982-05-24 1984-01-11 Flo Con Syst Pressure fluid teeming valve and method
DE3307193A1 (de) * 1983-03-01 1984-09-06 VGT AG, 3432 Großalmerode Feuerfeste platte, insbesondere fuer schieber- oder drehverschluesse an metallurgischen gefaessen
WO1991013713A1 (fr) * 1990-03-16 1991-09-19 Flo-Con Systems, Inc. Vanne a porte coulissante, procede et refractaires remplaçables

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1518841A (en) * 1975-04-29 1978-07-26 Flogates Ltd Sliding gate valves
CA1103921A (fr) * 1976-10-15 1981-06-30 Earl P. Shapland Traduction non-disponible
CH653269A5 (de) * 1981-06-01 1985-12-31 Metacon Ag Verfahren zum verhindern des einfrierens von metallischen schmelzen im auslaufkanal eines giessgefaesses.
US4582232A (en) * 1984-06-19 1986-04-15 Flo-Con Systems, Inc. Valve, clamp, refractory and method
DE3422901C2 (de) * 1984-06-20 1987-02-05 Metacon AG, Zürich Verfahren zum Vergießen einer metallischen Schmelze
DE3509932A1 (de) * 1985-03-19 1986-10-02 Metacon AG, Zürich Verfahren zum anfahren einer stranggiessanlage
DE3742215A1 (de) * 1987-12-12 1989-06-22 Metacon Ag Verfahren zum freihalten des durchflusskanals von schiebeverschluessen an stranggiessanlagen
EP0356552B1 (fr) * 1988-08-31 1992-04-08 Metacon AG Procédé de réglage de fermetures à tiroir, en particulier dans les installations de coulée continue
IE910080A1 (en) * 1990-01-16 1991-07-31 Flogates Ltd Metal pouring method and apparatus
DE4006894A1 (de) * 1990-03-05 1991-09-12 Cerafer Sarl Schieberverschluss fuer metallurgische gefaesse, insbesondere giesspfannen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3764042A (en) * 1972-08-03 1973-10-09 United States Steel Corp Reciprocable slidable gate with rotating slide element
US4076153A (en) * 1974-10-24 1978-02-28 Metacon Ag Plate structure for a liquid metal container closure
US4415103A (en) * 1979-09-07 1983-11-15 Uss Engineers And Consultants, Inc. Full throttle valve and method of tube and gate change
GB2122315A (en) * 1982-05-24 1984-01-11 Flo Con Syst Pressure fluid teeming valve and method
DE3307193A1 (de) * 1983-03-01 1984-09-06 VGT AG, 3432 Großalmerode Feuerfeste platte, insbesondere fuer schieber- oder drehverschluesse an metallurgischen gefaessen
WO1991013713A1 (fr) * 1990-03-16 1991-09-19 Flo-Con Systems, Inc. Vanne a porte coulissante, procede et refractaires remplaçables

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004098817A1 (fr) * 2003-05-07 2004-11-18 Equipment Merchants International, Inc. Element d'arret coulissant d'ecoulement metallique dans un processus de coulage
US8371476B2 (en) 2009-11-02 2013-02-12 Lincoln Global, Inc. Bulk bag with gate valve assembly
CN114587424A (zh) * 2022-03-02 2022-06-07 深圳市华晨阳科技有限公司 一种唾液样品采集装置

Also Published As

Publication number Publication date
GB2311947A (en) 1997-10-15
GB9605223D0 (en) 1996-05-15
ZA972117B (en) 1997-09-17
AU1933597A (en) 1997-10-01

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