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WO1996034712A1 - Valve a clapet coulissant - Google Patents

Valve a clapet coulissant Download PDF

Info

Publication number
WO1996034712A1
WO1996034712A1 PCT/GB1996/001005 GB9601005W WO9634712A1 WO 1996034712 A1 WO1996034712 A1 WO 1996034712A1 GB 9601005 W GB9601005 W GB 9601005W WO 9634712 A1 WO9634712 A1 WO 9634712A1
Authority
WO
WIPO (PCT)
Prior art keywords
spring
sliding
gate valve
face
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/GB1996/001005
Other languages
English (en)
Inventor
Ian Mcnair
Paul Leslie Hill
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 AU54061/96A priority Critical patent/AU5406196A/en
Publication of WO1996034712A1 publication Critical patent/WO1996034712A1/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
    • B22D41/40—Means for pressing the plates together

Definitions

  • the present invention relates to sliding gate valves for controlling the flow of molten met&l through the tap hole of a vessel, and in particular to sliding gate valves having two refractory plates.
  • Sliding gate valves are well known and widely used in the steel industry. They typically include 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. For example see British Patents Nos. 1602716, 1602717 and 2110342.
  • 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 alignment.
  • 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.
  • the interface between the plates is such that molten metal should not flow between them, and in this configuration (the non-aligned position) fluid communication between the taphole and the teeming orifice is broken by the seal produced at the slide plate interface.
  • Metal flow can therefore be turned on or off by sliding the sliding gate plate in or out of alignment with the top plate, respectively.
  • the molten metal flow can be throttled by bringing the sliding plate orifice more or less into registry with the stationary plate orifice.
  • the sliding plate In order to maintain the seal between the plate, the sliding plate is biased towards the fixed top plate by appropriate spring means.
  • 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 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 method of monitoring the spring biasing of a sliding gate valve in which an orificed fixed plate and an orificed sliding plate are biased into face to face contact by compressed spring means, the method including the steps of de-compressing a spring of the spring means whilst the plates are in face to face contact and measuring the force required to re- compress the spring.
  • the method can be performed while the valve is in its normal, assembled state. Thus, down ⁇ time losses which disassembly would incur are avoided.
  • the arrangement of a preferred embodiment of the present invention is particularly advantageous in this regard as it allows access to the spring through a thrust bearing.
  • the force can be measured via the thrust bearing by a torque wrench or the like.
  • the springs of the spring means can be coil springs of conventional kinds used in the art, or thermodynamic elements - e.g. gas springs - as disclosed in our GB-A-1,457,708 and GB-A-1,518,841, the contents of which are incorporated herein by this reference.
  • “Springs” and “ ⁇ pring means” mentioned hereafter are meant to embrace any such mechanical or gas spring devices.
  • Fig. 1 shows a cross-sectional view through a sliding gate valve according to the present invention
  • Fig. 2 shows a cross-sectional view along the line A-A of Fig. 1;
  • Fig. 3(a) shows the view of Fig. 1 with the valve in a 2nd position
  • Fig. 3(b) shows the view of Fig. 3(a) with the valve in a 3rd position
  • Fig. 3(c) shows the view of Fig. 1;
  • Fig. 3(d) shows the view of Fig. 1 in a dismantled position.
  • the sliding gate valve 10 is shown fitted on to the bottom of a vessel 12 e.g. a ladle or a tundish, over an opening therein.
  • a vessel 12 e.g. a ladle or a tundish
  • the sliding gate valve 10 comprises a top fixed plate 14 and a bottom sliding plate 15 in face to face contact with the former.
  • the fixed plate 14 has an orifice aligned with the opening in the vessel 12.
  • the sliding plate 15 has a similar orifice to the fixed plate 14.
  • the sliding plate 15 is slidable between opened, closed and throttling positions respectively aligned, non-aligned and partially aligned with the orifice in the fixed plate 14.
  • the sliding plate 15 has a nozzle 16, attached immediately below its orifice for directing fluid flow therethrough.
  • the sliding plate 15 is cradled by a plate carrier 18 in a cradle-like support or recess portion 19 thereof.
  • a reciprocating ram 17 is coupled to the carrier 18 to slide the sliding plate 15, as shown in Fig. 2.
  • the reciprocating ram 17 is mounted and arranged such that its line of action on the carrier 18 lies in the same plane as the interface between the plates 14 and 15. The direction of the force applied by the reciprocating ram is thus in the same plane.
  • the carrier 18 is movable within a support frame 22 which is pinned to sets of lugs 21 at either aide of the valve assembly.
  • One set of luge 21 can provide for a hinge about which the support frame 22 can swing, together with the carrier 18 and the sliding plate 15, (as shown in Fig. 3(d)) to a dismantled position.
  • the lugs 21 are integral with a mounting plate 11 fixed to the bottom of the vessel 12. The lugs and pins are centred on the interface plane.
  • the carrier 18 is biased upwardly by springs 25 as defined hereinbefore, (here shown as compression coil springs), to urge the sliding plate 15 sealingly against the fixed plate 14.
  • the springs 25 act through blocks 26 against a rim portion 20 of the carrier 18.
  • Each block 26 comprises a wear pad, e.g. of stainless steel.
  • Each spring 25 extends through an opening in the support frame 22.
  • the springs 25 in use are held between the blocks 26 and jacking or thrust means 29 mounted in a lower part 28 of the support frame 22.
  • the thrust means 29 are movable from a non-compressing position shown in Figs. 3(c) and 3(d) to a compressing position shown in Figs. 1 and 3(b).
  • Each spring 25 is at its natural length when its associated thrust means 29 is in its non-compressing position.
  • the spring 25 is compressed to its operating po ⁇ ition.
  • the spring 25 is compressed to its operating length when the thrust means 29 is moved to its compressing position.
  • the thrust means 29 is here shown as comprising a bolt screw-threaded into a thrust bearing or sleeve.
  • the thrust means 29 and the springs 25 are removable from the support frame 22 as shown in Fig. 3(a). This permits removal and replacement of springs 25 without dismantling the valve assembly and without having to open the assembly as depicted in Fig. 3(d).
  • the carrier 18 is contained in the support frame 22 and is prevented from falling out of the frame 22 by a stop 23 formed on the carrier 18.
  • Each block 26 is a separate wear part and is mounted in an opening formed between the carrier 18 and the support frame 22.
  • the spring 25 when compressed to its operating length acts on its associated block 26 through the opening formed in the support frame 22.
  • the block 26 acts as part of a plate-biasing means with the associated spring 25.
  • the blocks 26 cannot fit through the openings formed in the support frame 22 and are thus not removable from the valve 10 in a similar way to the springs 25 (as shown in Fig . 3 ( a) ) .
  • Fig. 3(b) shows the springs 25 compressed to the operating length and the valve 10 is in its first position.
  • the springs 25 urge the carrier 18 upwardly.
  • the sliding plate 15 is thus biased into face to face contact with the fixed plate 14.
  • the contacting faces of the plates 14, 15 act as a seal against the ingress of molten metal.
  • the contact faces of the plates 14, 15 meet along a contact plane.
  • the rim portion 20 of the carrier 18 extends upwardly from the support portion 19.
  • the back face of the rim portion 20 against which the spring means acts is co- planar with the contact plane. This reduces or eliminates development of turning forces imparted to the carrier 18. Of course, slight mis-alignment of the back face will cause some turning forces, but will still show significant improvement over previously known arrangements.
  • the valve 10 has a total of twelve springs 25 biasing the carrier 18.
  • the springs 25 are mounted in two rows of six springs 25, one row along each side of the sliding plate 15.
  • Each thrust means 29 may be designed to compress three of the springs 25 of one row. Accordingly, four thrust means 29 are used in the illustrated embodiments.
  • a three plate sliding gate valve could also incorporate the features of the present invention.
  • Sliding gate valves according to the present invention allow more detailed monitoring of valve condition.
  • the present valve 10 allows the springs 25 to be removed whilst the plates 14, 15 are in their assembled position, i.e. without necessitating disassembly of the valve.
  • the springs 25 can be checked to see if their biasing forces are inadequate.
  • the condition of the springs 25 can be checked without removal from the valve 10.
  • the thrust means 29 are in turn slackened decompressing their associated spring or springs 25. Thereafter the spring or springs 25 is or are re-compressed until the thrust bearing abuts the frame 18. If the torque for tightening to this position is measured the state of the spring or springs 25 can be assessed. If the measured torque has fallen below a known limit, then the spring force of the one or more springs 25 has deteriorated below a working condition. The springs can be then be replaced if necessary.
  • the invention is applicable to sliding gate valves of the general kinds commonly used in the metallurgical industry to control the flow of molten metal from one vessel to another.
  • One such vessel may be a ladle or tundish, and another a mould such as a continuous caster mould.
  • spring means are used to bias their flow- controlling valve plates into sealing, face-to-face contact, and by this invention it is contrived that the valve springs can be trested in situ and replaced when necessary without the usual requirement to dissassemble the valve.

Landscapes

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

Abstract

Cette invention concerne une valve (10) à clapet coulissant permettant de réguler le débit d'un métal en fusion provenant d'un récipient (12). Cette valve (10) comprend une plaque fixe perforée (14) ainsi qu'une plaque coulissante perforée (15), cette dernière étant montée coulissante sur un sous-ensemble de support à charnière (18, 22). La plaque coulissante (15) est poussée jusqu'à entrer en contact facial avec la plaque fixe (14). Le dispositif de poussée (25, 26) comprend des ressorts (25) pouvant être retirés de la valve (10) tandis que les plaques (14, 15) se trouvent en contact face à face.
PCT/GB1996/001005 1995-05-03 1996-04-26 Valve a clapet coulissant Ceased WO1996034712A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU54061/96A AU5406196A (en) 1995-05-03 1996-04-26 Sliding gate valve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9509013.0A GB9509013D0 (en) 1995-05-03 1995-05-03 Improved sliding gate valve
GB9509013.0 1995-05-03

Publications (1)

Publication Number Publication Date
WO1996034712A1 true WO1996034712A1 (fr) 1996-11-07

Family

ID=10773936

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1996/001005 Ceased WO1996034712A1 (fr) 1995-05-03 1996-04-26 Valve a clapet coulissant

Country Status (4)

Country Link
AU (1) AU5406196A (fr)
GB (1) GB9509013D0 (fr)
WO (1) WO1996034712A1 (fr)
ZA (1) ZA962806B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10033904A1 (de) * 2000-07-12 2002-01-31 Stopinc Ag Huenenberg Schieberverschluss zum Vergiessen von Metallschmelze, sowie eine dazugehörige feuerfeste Platteneinheit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2046051A1 (de) * 1969-09-24 1971-04-01 Uss Eng & Consult Stutzmechanismus fur Schieberver Schlüsse an Gießgefaßen mit Bodenausguß
FR2140422A1 (fr) * 1971-06-07 1973-01-19 Uss Eng & Consult
CH639301A5 (en) * 1979-02-28 1983-11-15 Stopinc Ag Slide gate nozzle for metallurgical vessels
DE3532260A1 (de) * 1984-09-11 1986-03-20 Kurosaki Refractories Co., Ltd., Kitakyushu, Fukuoka Gleit- oder verschiebeduesenvorrichtung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2046051A1 (de) * 1969-09-24 1971-04-01 Uss Eng & Consult Stutzmechanismus fur Schieberver Schlüsse an Gießgefaßen mit Bodenausguß
FR2140422A1 (fr) * 1971-06-07 1973-01-19 Uss Eng & Consult
CH639301A5 (en) * 1979-02-28 1983-11-15 Stopinc Ag Slide gate nozzle for metallurgical vessels
DE3532260A1 (de) * 1984-09-11 1986-03-20 Kurosaki Refractories Co., Ltd., Kitakyushu, Fukuoka Gleit- oder verschiebeduesenvorrichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10033904A1 (de) * 2000-07-12 2002-01-31 Stopinc Ag Huenenberg Schieberverschluss zum Vergiessen von Metallschmelze, sowie eine dazugehörige feuerfeste Platteneinheit

Also Published As

Publication number Publication date
ZA962806B (en) 1997-01-24
AU5406196A (en) 1996-11-21
GB9509013D0 (en) 1995-06-21

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