EP0400257A1 - Dispositif de fermeture à coulisse, en matériau réfractaire, pour récipients métallurgiques - Google Patents

Dispositif de fermeture à coulisse, en matériau réfractaire, pour récipients métallurgiques Download PDF

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Publication number
EP0400257A1
EP0400257A1 EP89830243A EP89830243A EP0400257A1 EP 0400257 A1 EP0400257 A1 EP 0400257A1 EP 89830243 A EP89830243 A EP 89830243A EP 89830243 A EP89830243 A EP 89830243A EP 0400257 A1 EP0400257 A1 EP 0400257A1
Authority
EP
European Patent Office
Prior art keywords
refractory
pouring
slide
fact
appliance
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.)
Granted
Application number
EP89830243A
Other languages
German (de)
English (en)
Other versions
EP0400257B1 (fr
Inventor
Giovanni Timossi
Roberto Ricci
Salvatore Foglio
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.)
Ilva SpA
Vesuvius Italia SpA
Original Assignee
Ilva SpA
Nuova Sanac SpA
Vesuvius Italia SpA
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8203223&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0400257(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to DE68926293T priority Critical patent/DE68926293T2/de
Priority to EP89830243A priority patent/EP0400257B1/fr
Priority to DE198989830243T priority patent/DE400257T1/de
Priority to AT89830243T priority patent/ATE136828T1/de
Priority to ES89830243T priority patent/ES2020156A4/es
Application filed by Ilva SpA, Nuova Sanac SpA, Vesuvius Italia SpA filed Critical Ilva SpA
Priority to US07/563,959 priority patent/US5000362A/en
Publication of EP0400257A1 publication Critical patent/EP0400257A1/fr
Priority to GR91300051T priority patent/GR910300051T1/el
Publication of EP0400257B1 publication Critical patent/EP0400257B1/fr
Application granted granted Critical
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
    • 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
    • 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

  • Slide-gate pouring appliances for ladles and similar devices have been commonly used for about two decades now. They were however designed far earlier, at the beginning of the last century, and the long delay before they were applied must be blamed on the fact that to enable them to operate properly, refractory bricks with high mechanical, thermal and chemical properties are required. These properties have become available only relatively recently, and since then slide-gate pouring appliances have continued to become increasingly widespread. First of all they were applied to smaller gates and then, gradually, to larger ones.
  • the basic refractory elements of a slide-gate shut-off device consist of two holed plates of which one fixed and one sliding, of a sleeve below the sliding refractory plate known as the exter­nal pouring appliance and a sleeve above the fixed refractory plate known as the internal pouring appliance.
  • the internal pouring appliance is not directly surrounded by the refractory lining of the ladle, but isolated from it by means of a larger sleeve, called the pouring-applicance holder and which, unlike the internal pouring appliance has to be fitted and replaced from inside the ladle.
  • This pouring-­appliance holder is also an integral part of the slide-­gate pouring appliance.
  • the aim of this invention is to implement a large slide-gate shut-off device, the parts of which will wear out at the same rate. In this way it will be pos­sible to space maintenance activities further apart, without the wastages caused by early replacement of parts which are not yet fully worn out. According to this invention, this aim has been fulfilled not only simply by increasing the dimensions (for example the thicknesses) of the parts which wear out more rapidly but also and above all by correctly configuring the various parts of the shut-off device.
  • the slide-gate shut-off device has: (a) a fixed holed refractory plate, (b) a sliding holed refractory plate, below it, (c) a sleeve made of refractory material solidly connected to the latter, above the fixed refractory plate, (d) a fixed refractory sleeve, also known as the internal pouring appliance, around which a holder (e) is arranged.
  • the refractory plates are holed in the centre and are doubly symmetrical; in addition, said internal pouring appliance becomes gradually thinner towards the top and the radial thick­ness of its bottom base is about double the radial thickness of the internal sliding refractory sleeve.
  • This sliding refractory sleeve is approximately equal to the radius R of the pouring holes in the fixed and sliding refractory plates.
  • the shut-off device made of refractory material includes an internal pouring-appliance holder made up of two superimposed elements indicated by 11 and 12, the mating surface of which is fitted with a centering key 13. These two elements have to be fitted from inside the ladle and of course their re­ placement times will be far longer than the replacement times of the remaining refractory elements of the shut-­off device, which can be disassembled and reassembled from outside the ladle.
  • the inside surface of the pouring-device holder 11-12 has a first upper piece, truncated-cone shaped, 14, open at the top where it is shaped like a funnel suitable for conveying the liquid metal downwards.
  • the height of this first part, indicated with the num­ber 14, is about 2-3 times the radius R of the minimum cross-section of the duct through which the liquid metal passes.
  • the value of said radius R shall be assumed as a conven­tional unit of measurement.
  • the radius R is chosen, from time to time, depending on the dimensions of the ladle and of the capacity of the devices downstream from the latter which have to receive the flow of mol­ten steel.
  • the tangent of the opening angle of the conical surface 14 is comprised between above 0.2-0.4; below this first conical portion there is a second, cylindrical, portion 15, the height of which is equal to about 0.2 - 2 times R. Below this, the inside sur­face of the pouring-appliance holder 11-12 has again a conical shape, opening out towards the bottom, and the angle of opening of which is about 2-6 degrees. This angle allows the internal pouring appliance 20 to be inserted or removed from underneath.
  • the internal pouring appliance 20 has a height of about 10 times R, and is passed through by a hole 21 formed by an upper conical part 22, and a lower cylindrical part 23.
  • the height of the lower cylindrical part 23 is about 3-4 times R.
  • the tangent of the angle at the ver­tex of the conical surface 22 is approximately equal to 0.15-0.45.
  • the width of the upper ring-shaped base 24 of the internal pouring appliance 20 is approximately equal to R and starts just below the cylindrical part 15 of the pouring-appliance holder 11-12. In this way a step is created which will wear out progressively due to the abrasive effect of the liquid steel, gradually transforming the conical surfaces 14 and 21 into a single surface shaped more or less like a paraboloid of revolution.
  • the flow of liquid steel is now directed towards the boundary and enters the cylindrical duct 22-23 causing less wear.
  • the radial thickness of the lower ring-shaped base 25 of the internal pouring appliance 20 will be approxima­tely equal to 2R.
  • the lower ring-shaped base 25 of the internal pouring appliance 20 has a circular rib 26 lo­cated in the vicinity of the outer rim of the base itself. This circular rib serves as a centering element between the lower base of the internal pouring applian­ce 20 and the upper surface of the fixed refractory plate 30 which is equipped with a corresponding groove 31.
  • the plate 30 is equipped with a central hole having a radius R, and its thickness is approximately the same; the remaining relative dimensions of the fixed refractory plate 30 are described in detail below.
  • the underside of the fixed upper plate 30 is accurately flattened, since it serves as a sealing surface over which the upper surface of the underlying sliding refractory plate 40 slides.
  • the sliding plate 40 also has a central hole 42, and on its underside a circular groove 41 which accommodates a corresponding rib 51 protruding from the upper ring-shaped base 52 of the lower sleeve 50, which slides together with the lower plate 40 and forms the external pouring appliance.
  • the radial thickness of the lower sleeve 50 is ap­proximately equal to R, and its height Hl is about 6-12 times the radius R of the pouring hole.
  • the hole 53 of the lower sleeve 50 is cylindrical, and its lateral surface 54 is also cylindrical although it has at the bottom a conically bevelled edge which makes it easier to insert the lower end of the external pouring ap­pliance into the upper end of an underlying plunger type pouring appliance below it.
  • the fixed upper plate 20 is illustrated in detail in figures 3 and 12: it is symmetrical in respect of two orthogonal horizontal axes and its width is equal to approximately 5-7 times the radius R, while its length is approximately equal to 12-16 times the radius R.
  • the two ends 33 of the refractory plate 30 are shaped as semicircles with centres 34. The distance between the centres 34 and 35 corresponds roughly to double the relative travel of the fixed and mobile plates. In this way the distribution of the refractory material is optimized, as its free edges are always at the same distance from the area in contact with the molten steel, whatever the working position of the distribu­tion device may be.
  • the fixed upper refractory plate 30 has a metal cover­ing 60 consisting of a sheet of lamina 61 which covers the contour of the plate 30 and has an outer edge 62.
  • the height of this edge 62 is approximately equal to the thickness of the plate 30 and its upper edge 63 is curved slightly outwards, as shown in the close-up of figure 12, so as to strengthen the covering itself and allow easy insertion of the plate 30 inside the cover­ing 60 during assembly, without excessive clearances and consequent excessive thickness of the layer of refractory mortar 64 located between the plate 30 and the covering 60.
  • the covering 60 also has on the bottom 61 a circular opening 65, the rim 66 of which is folded inwards into an arch so as to create a supporting surface for the refractory plate which is supported at a pre-estabished height from the bottom 61 of the covering.
  • the height of this rim 66 also defines the thickness of the layer of mortar.
  • the thickness of the layer of mortar 64 is also ensured by protrusions 67 made by presswork and arranged on the bottom 61.
  • the circular opening 65 in the bottom of the covering 60 is larger than the outside diameter of the internal pouring appliance 20, so that there is no interference, as shown in figure 1.
  • the sliding refractory plate 40 differs from the fixed refractory plate 30 in that the circular groove 41 has a smaller diameter in view of the lesser thickness of the lower refractory sleeve 50 as compared to the thickness of the internal pouring appliance 20.
  • This difference between the plates 30 and 40 on the one hand and the refractory sleeves 20 and 50 on the other, is very important for the purposes of the invention. Indeed the internal pouring appliance 20 wears out more quickly than the sleeve 50 in the hole of which the flow of liquid steel is already perfectly directed along vertical flowlines.
  • the refractory sleeve 50 As far as concerns the refractory sleeve 50, it should be noted that it too has a metal casing 56, with a double sloping truncated cone shape.
  • the lower part 58 supports directly the weight of the sleeve 50, while the upper part 57 defines a meatus with a decreasing thickness inside which the connecting refractory mortar is placed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Sliding Valves (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Lift Valve (AREA)
EP89830243A 1989-06-02 1989-06-02 Dispositif de fermeture à coulisse, en matériau réfractaire, pour récipients métallurgiques Expired - Lifetime EP0400257B1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP89830243A EP0400257B1 (fr) 1989-06-02 1989-06-02 Dispositif de fermeture à coulisse, en matériau réfractaire, pour récipients métallurgiques
DE198989830243T DE400257T1 (de) 1989-06-02 1989-06-02 Schieberverschluss aus einer feuerfesten masse fuer metallurgische behaelter.
AT89830243T ATE136828T1 (de) 1989-06-02 1989-06-02 Schieberverschluss aus einer feuerfesten masse für metallurgische behälter
ES89830243T ES2020156A4 (es) 1989-06-02 1989-06-02 Valvula de puerta deslizable hecha de un material refractario para vasijas metalurgicas
DE68926293T DE68926293T2 (de) 1989-06-02 1989-06-02 Schieberverschluss aus einer feuerfesten Masse für metallurgische Behälter
US07/563,959 US5000362A (en) 1989-06-02 1990-08-07 Shut-off device made of refractory material for a slide-gate pouring appliance
GR91300051T GR910300051T1 (en) 1989-06-02 1991-11-15 Slide gate valve made of a refractory material for metallurgical vessels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89830243A EP0400257B1 (fr) 1989-06-02 1989-06-02 Dispositif de fermeture à coulisse, en matériau réfractaire, pour récipients métallurgiques

Publications (2)

Publication Number Publication Date
EP0400257A1 true EP0400257A1 (fr) 1990-12-05
EP0400257B1 EP0400257B1 (fr) 1996-04-17

Family

ID=8203223

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89830243A Expired - Lifetime EP0400257B1 (fr) 1989-06-02 1989-06-02 Dispositif de fermeture à coulisse, en matériau réfractaire, pour récipients métallurgiques

Country Status (5)

Country Link
EP (1) EP0400257B1 (fr)
AT (1) ATE136828T1 (fr)
DE (2) DE400257T1 (fr)
ES (1) ES2020156A4 (fr)
GR (1) GR910300051T1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2113271A1 (es) * 1994-09-07 1998-04-16 Krosaki Corp Estructura de fijacion de bastidor de placa metalica para tobera deslizante.
DE10066084B4 (de) * 1999-09-10 2007-03-15 Yamaha Corp., Hamamatsu Tastenmusikinstrument mit Sichtanzeigeeinheit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021004626A1 (de) 2021-09-14 2023-03-16 PiRé Feuerfeste Produkte GmbH & Co. KG Verfahren zur Reparatur eines Schieberverschlusses

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU59070A1 (fr) * 1968-07-11 1969-11-20
FR2257374A1 (fr) * 1974-01-16 1975-08-08 Uss Eng & Consult
FR2433384A1 (fr) * 1978-08-19 1980-03-14 Stopinc Ag Dispositif de fermeture a tiroir a trois plaques
GB2040423A (en) * 1979-01-15 1980-08-28 Sanac Spa Improved refractory plate with metallic covering
GB2163079A (en) * 1982-08-20 1986-02-19 Flo Con Syst Pressure plate for sliding gate valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU59070A1 (fr) * 1968-07-11 1969-11-20
FR2257374A1 (fr) * 1974-01-16 1975-08-08 Uss Eng & Consult
FR2433384A1 (fr) * 1978-08-19 1980-03-14 Stopinc Ag Dispositif de fermeture a tiroir a trois plaques
GB2040423A (en) * 1979-01-15 1980-08-28 Sanac Spa Improved refractory plate with metallic covering
GB2163079A (en) * 1982-08-20 1986-02-19 Flo Con Syst Pressure plate for sliding gate valve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2113271A1 (es) * 1994-09-07 1998-04-16 Krosaki Corp Estructura de fijacion de bastidor de placa metalica para tobera deslizante.
DE10066084B4 (de) * 1999-09-10 2007-03-15 Yamaha Corp., Hamamatsu Tastenmusikinstrument mit Sichtanzeigeeinheit

Also Published As

Publication number Publication date
ES2020156A4 (es) 1991-08-01
EP0400257B1 (fr) 1996-04-17
ATE136828T1 (de) 1996-05-15
DE68926293T2 (de) 1996-09-19
DE400257T1 (de) 1991-05-23
GR910300051T1 (en) 1991-11-15
DE68926293D1 (de) 1996-05-23

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