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
  • B22D41/50—Pouring-nozzles
  • B22D41/502—Connection arrangements; Sealing means 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
  • B22D41/04—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like tiltable

Definitions

• the invention relates to a tilting tank for the treatment of liquid metal, typically for the treatment by gases or filtration of liquid aluminum or magnesium or their alloys, and its device for sealing assembly with fixed troughs used for the 'supply or evacuation of said liquid metal from the tank.
• a tank of liquid metal used for its treatment by gases or for its filtration or simply for its storage on standby has a capacity generally not exceeding 3 tonnes and comprises devices for feeding and leaving the liquid metal. Said liquid metal enters and leaves the tank continuously, however it is regularly necessary to empty the latter partially or entirely by tilting around a horizontal axis at an angle typically between 30 ° and 90 °.
• the tank can be equipped with a special drain hole located in its lower part.
• the liquid metal outlet device comprises an orifice, or tap hole, usually drilled at the top of one of the walls of the tank, extended by a pouring spout pouring the liquid metal into a fixed discharge chute.
• the device for supplying liquid metal from a fixed chute is generally of the same kind.
• the tank is a rectangular parallelepiped and the tilting axis parallel to its long length. It is essential that the articulated connection between the spout integral with the tank and the fixed chute remains tight against liquid metal at high temperature, despite repeated heating and cooling cycles of the installation.
• the tank equipped with such an arrangement When tilting, the tank equipped with such an arrangement has a large size, in particular when the tilting angle is 90 °, this space being due to the fact that the tilting axis passes at the end of the spout .
• metal can freeze in the articulated device, in particular between the toggle, the spout and the chute, which complicates and particularly hinders maintenance or disassembly operations.
• Such a device can only be used for small tilt angles due to the fact that the braid is driven as soon as the tilt angle becomes a little large. Thus, this device is not applicable to treatment vessels, in particular those which tilt with large angles.
• it is difficult to obtain a good seal due to the fact that said two parts embedded one inside the other expand differently in the diametrical direction, that the troughs easily deform during the numerous thermal cycles which they undergo and that the tightening force of the braid is not adjustable.
• there is a great risk of blockage of the device due to the metal which can slip and freeze in the gap between the spout and the chute.
• the Applicant has thus sought to avoid the above drawbacks and to develop a tilting treatment tank of reduced tilting size and simultaneously having an articulated connection device, between the spout secured to the tank and the fixed chute, perfectly waterproof while being simple to design and use (adjustment, maintenance, disassembly, cleaning) and without the said device being able to cause the freezing (solidification) of liquid metal.
• the invention is a liquid metal treatment tank tilting around an axis, fed by a fixed chute and pouring said liquid metal into a fixed chute. evacuation, said tank comprising at least one through hole for feeding, leaving or emptying the liquid metal formed in one of its walls and extended by a so-called movable spout secured to the tank, characterized in that at least the axis of the fixed discharge chute is coincident with the tilting axis.
• the axis of the feed chute is also coincident with the tilting axis. It is particularly advantageous to practice this arrangement for tanks tilting at an angle greater than 30 ° and up to 90 °.
• the tank is at least approximately rectangularepipedic rectangle, its walls possibly having a slight draft, and the tilting axis is parallel to its long length, that is to say parallel to the large walls and perpendicular to the small ones.
• Said tilting axis preferably passes through an upper angle of said small walls; in this case it is confused not only with the axes of the fixed chutes and movable pouring or feeding spouts but also with those of the pouring or feeding holes. But it can very well be located at another place in the tank or even offset outside the tank; in this case it is still confused with the axes of the fixed chutes and movable spouts.
• the ends of the movable spouts and the fixed chutes of circular cross section, aligned on the tilting axis, are connected by a connecting device articulated in rotation around the said axis, tight against liquid metal, capable of rotating an angle greater than 30 ° and up to 90 ° without losing its seal and thus allowing the tank to be partially or totally emptied.
• Said device articulated in rotation comprises: - An adapter flange secured to the end of the spout, centered on the tilting axis, comprising a bearing surface of a circular joint whose plane is perpendicular to said axis;
• a clamping device possibly supported on a fixed part, making it possible to adjust and maintain the clamping of the flanges relative to one another to ensure the tightness of the connection while leaving said two flanges pivot the one in relation to the other.
• the movable spout and the fixed chute being in the extension of one another so that the bearing surfaces of the facing seals correspond perfectly, it is advantageous to have on each of the flanges centering means cooperating with the other and may constitute a centering device.
• one of the flanges may include a cylindrical protuberance, at the end of which the joint surface may be located; this circular protuberance, like the flange, is designed to engage with gentle friction in a corresponding housing located on the other flange and at the bottom of which may be the other seal surface facing that of the first flange.
• the tightening device may comprise threaded tie rods bearing on the one hand on one or more supporting parts integral with the frame, fixed or preferably maneuverable, and on the other hand on the connecting flange, by means of parts elastic, for example springs or domed washers of the so-called "belleville” type Nuts allow the tightening force to be adjusted by compressing the elastic parts more or less
• the elastic parts also make it possible to maintain the seal during thermal cycles by casing the dilations
• the flanges are generally made of steel or refractory cast iron; the interior of the fixed chute portion can be coated with the same refractory product as that of the spouts, the chutes or the liquid metal tank.
• the device according to the invention applies to the connection of the liquid metal tank both with its outlet chute and with that of the supply. When it applies to both, the latter are located on the same axis, as already mentioned.
• the invention also relates to the liquid metal tanks comprising one or more articulated connection devices and the methods implementing the tanks or the said devices according to the invention.
• the methods are in particular the filtration or treatment by gases of liquid metals such as aluminum, magnesium or their alloys.
• Figure 1 illustrates the invention and shows a view of a liquid metal tank whose tilting axis passes through the upper part of one of its walls.
• FIG. 2 represents a profile view of a hinged link in rotation mounted on a liquid metal tank of the type of that of FIG. 1.
• FIG. 3 illustrates a side view of the preferred embodiment of the articulated link in rotation according to the invention.
• Figure 1 shows the installation of a passage hole (5) for pouring, emptying or feeding the liquid metal and the spout (7) extending it on a small wall (2) of the tank (1).
• the through hole (5) is located at the top of said tank, near a large wall (25) (sectional view) perpendicular to the small wall (2); the tilting axis (6) passes through its center and is parallel to said large wall (25). It can be seen that, thanks to this arrangement and to the sealed articulated connection device according to the invention, it is easily possible to completely empty the tank by tilting it in the direction of the arrow (24), the need for space to perform this operation being minimized.
• FIG. 2 we see in (1) a parallelepipedal liquid metal tank with a small wall (2) having a slight draft, covered internally with a refractory material (2a), and a cover (3) also internally covered with a refractory material (4).
• a through hole (5) for pouring, emptying or feeding the liquid metal.
• the tank is tiltable around the tilting axis (6) passing through said passage hole (5).
• the latter is extended by a movable spout (7) integral with the tank (1) and which pivots with it; it is coated internally with a refractory material (8).
• the adjustable tightening of the seals (12, 13) can be ensured by threaded tie rods (19) bearing on a fixed part (20) secured to a frame (21), by means of a spring (22) of which the crushing is regulated by nuts.
• the tight connection device for liquid metal, articulated in rotation around an axis (6) and allowing the tilting of a tank (1) of liquid metal comprises: - an adapter flange (10, 10a, 10b, 10c) secured to the end of the spout (7, 8), centered on the tilting axis (6) and having a circular joint surface perpendicular to said axis (6 ); - a connecting flange (15, 15a, 15b) secured to the end of the fixed chute (17, 18), centered on the tilting axis (6) and comprising a bearing surface of a circular joint, perpendicular to said axis ( 6), facing and cooperating with the previous one;
• a tightening device (19, 19a, 22, 22a, 22b 22c) making it possible to adjust the tightening of the flanges (10, 10a, 10b. 10c, 15, 15a, 15b) relative to each other to ensure sealing the connection while leaving said flanges (10, 10a, 10b, 10c, 15. 15a, 15b) pivot relative to each other.
• connection device advantageously comprises a centering device (11, l ia, 14, 14a) of the flanges (10, 10a, 10b, 10c, 15, 15a, 15b) relative to each other .
• This centering device can comprise, on one of the flanges (10, 10a, 10b, 10c, 15, 15a, 15b), a cylindrical protuberance (11, l ia) engaging with gentle friction without a corresponding housing (14, 14a ) located on the other flange (10, 10a, 10b, 10c, 15, 15a, 15b).
• one of the joint surfaces can be located at the end of the protuberance (11), the other joint surface being at the bottom of the housing (14), so that the two joint surfaces face each other.
• the joint bearing surfaces are provided at the end of specific protuberances (15b, 10b) of the flanges (10a, 10b, 10c, 15a, 15b), said bearing surfaces being arranged so that they face each other.
• the adjustable clamping device comprises threaded tie rods (19) bearing on the one hand on one or more fixed support pieces (20), preferably integral with a frame (21 ) and on the other hand on one of the flanges (10, 15), by means of elastic parts or a spring (22), nuts making it possible to adjust the crushing and, consequently, the clamping force.
• the adjustable clamping device comprises a protuberance (22c) on one of the flanges (10, 10a, 10b, 10c, 15. 15a, 15b), an annular flange (22b) and means tightening adjustment (19a, 22a), such as bolts (19a) and "belleville” type washers (22a). This variant further simplifies the opening and dismantling of the connection device.
• the spout (7) may comprise at its end a counter flange (9) on which is tightly fixed the adapter flange (10) comprising a cylindrical protuberance (11).
• the seal (12) preferably based on graphite. This seal (12) is applied against the corresponding seal (13) placed on the seal surface located at the bottom of the cylindrical housing (14) forming part of the connecting flange (15) and cooperating with the protuberance (1 1) to center the device.
• the flanges (10, 10a, 10b, 10c, 15, 15a, 15b) may comprise several separate parts which are preferably fixed to each other, for example, using pins stop in rotation (26, 27) or fixing means (28).
• the rotating stop pins (26, 27) can be welded to the corresponding flanges (10b, 15b) and specific housings provided in the corresponding flanges (10a, 15a).
• the connecting flange (15, 15a, 15b) is fixed by means of a counter flange (16) on a portion of fixed trough (17) removable, located in the extension of the main body of the fixed trough (18) .
• a sealed coupling device between the main body (18) and the removable portion (17) of the fixed chute.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Manufacture And Refinement Of Metals (AREA)
• Coating With Molten Metal (AREA)
• Loading And Unloading Of Fuel Tanks Or Ships (AREA)
• Physical Or Chemical Processes And Apparatus (AREA)
• Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
• Electroplating Methods And Accessories (AREA)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
• Centrifugal Separators (AREA)
• Joints Allowing Movement (AREA)
• Filling Of Jars Or Cans And Processes For Cleaning And Sealing Jars (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=9531733

Family Applications (1)

Country Status (9)

Families Citing this family (3)

Family Cites Families (8)

• 1998
  • 1998-10-15 FR FR9813088A patent/FR2784608B1/fr not_active Expired - Lifetime
• 1999
  • 1999-10-14 EP EP99949050A patent/EP1133372B1/de not_active Expired - Lifetime
  • 1999-10-14 AT AT99949050T patent/ATE229860T1/de active
  • 1999-10-14 US US09/806,497 patent/US6576184B1/en not_active Expired - Lifetime
  • 1999-10-14 AU AU62071/99A patent/AU6207199A/en not_active Abandoned
  • 1999-10-14 DE DE69904646T patent/DE69904646T2/de not_active Expired - Lifetime
  • 1999-10-14 WO PCT/FR1999/002491 patent/WO2000021701A1/fr active IP Right Grant
  • 1999-10-14 BR BR9914503-0A patent/BR9914503A/pt not_active IP Right Cessation
  • 1999-10-14 ES ES99949050T patent/ES2188252T3/es not_active Expired - Lifetime

Non-Patent Citations (1)

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