EP1294508B1 - Refractory pouring spout and channel unit for the arrangement on an outlet of a vessel containing molten metal, especially a tundish of a strip casting installation - Google Patents

Abstract

A refractory pouring spout and channel unit for the arrangement on the outlet of a tundish of a strip casting installation has at least one vertical, refractory pouring spout and channel part ( 25 ) which can be connected to the tundish; and a refractory pouring spout and channel part ( 25 ') which originates from said vertical part, which extends horizontally and which is provided with one or more openings that are distributed over its length. This results in almost constant laminar flow conditions for the melt flowing between the casting rollers.

Description

The invention relates to a refractory casting tube unit for the arrangement on the spout a molten metal containing vessel, in particular at the spout of a Zwischenbehälters a strip casting, wherein the casting tube unit at least a connectable to the intermediate container vertical refractory casting tube and an outgoing from this, extending horizontally refractory Gießrohrteil, which with one or more over the length distributed openings is provided.

In a known strip casting machine according to the document FR-A-2-753 402 is above the casting rolls a distribution vessel and arranged above this a pan. A pouring tube at the spout of the pan protrudes into the distribution vessel, the in turn, a spout and one between the casting rolls. having leading nozzle. In addition, in the pan is a plug closure for a controlled pouring provided the melt. The disadvantage here is that in the distribution vessel in filled condition a relatively large ferrostatic height exists, which is a causes correspondingly high exit velocity. This is through the between the casting rolls flowing melt a not constant inflowing amount caused and it arises between these casting rolls a corresponding restless Bath.

From document JP-A-01228649 (abstract and drawings) a refractory pouring tube unit is known, which is arranged on an intermediate container is and immersed in the molten bath between two casting rolls. The Casting tube unit consists of a spout, which is connected to the intermediate container is and a dip tube, which surrounds the spout The dip tube consists of a horizontally extending casting tube part, which with several is provided over the length distributed openings for the melt. The Immersion tube contains inside an elongated chamber and below the chamber two elongated distribution holes communicating via openings stand. From the oblong holes go obliquely upward slits from which the introduced via the spout in the dip tube melt in the melt bath enters between the casting rolls. A disadvantage of this casting tube unit is that the melt due to the chosen construction with relative high kinetic energy emerges and visible against the surface of the casting rolls should be directed and is deflected from there into the melt bath, whereby possibly lead to damage of the strand shell of the cast strip can.

In this prior art, the present invention based on the object designed to make a casting tube unit such that between the Casting rolls inflowing melt with the smallest possible kinetic energy with laminar uniform flow and the forming bath level remains as flat as possible between these casting rolls. In addition, should with the casting tube unit be achieved that the melt as evenly as possible over the entire Casting roll length is distributed and the band skin of the steel on the two Rolls over their entire width is formed with a constant Dickenvenauf.

The object is inventively achieved in that the horizontally elongated Gießrohrteit is divided by a separation into an upper and a lower chamber, wherein the spout of the vertical Gießrohrteils opens into the lower chamber and in the separation openings are provided, through which the in the lower Chamber melt can flow into the upper chamber and from this through openings in the wall bounding the upper chamber can.

With this pouring tube unit according to the invention it is ensured that the melt between the casting rolls evenly and this in turn with a slow Flow is distributed so that the bath surface remains calm. This contributes significantly to a perfect pouring of this strip casting machine.

In training of the inventive idea is provided that the plurality of the length distributed openings of the horizontal Gießrohrteils from the lower end spaced upwards, so that in the Gießrohrteil a sump is formed. It is advantageous that the horizontal Gießrohrteil an approximate rectangular, triangular or polygonal, round, semicircular or one having similar cross-section, of the both sides as well as preferably end face lead away the openings.

In an inventive embodiment of the casting tube unit is provided that the elongated casting tube part independent of the vertical casting tube part on a separate Suspension is held and this one casting tube part here in the other Gießrohrteil extends.

An advantageous embodiment of the casting tube unit is characterized in that on the bottom of the tube one or more discharge openings for pouring the melt are provided at the pouring end. Advantageously, can also the lateral end elements of the casting tube unit with emptying openings be provided.

Fig. 1

einen Zwischenbehälter und eine erfindungsgemäße Gießrohreinheit im Längsschnitt;

Fig. 2

einen Schnitt einer Gießrohreinheit zwischen den angedeuteten Gießrollen;

Fig. 3

eine Seitenansicht der Gießrohreinheit nach Fig. 2;

Fig. 4

eine Variante einer Gießrohreinheit im Schnitt zwischen den angedeuteten Gießrollen:

Fig. 5

eine Seitenansicht der Gießrohreinheit nach Fig. 4;

Fig. 6

eine weitere Variante einer Gießrohreinheit im Schnitt;

Fig.7

einen Längsschnift durch die Gießrohreinheit mit einer unteren Kammer und einer oberen Kammer und einer dazwischen angeordneten Trennwand:

Fig. 8

einen Längsschnitt der Gießrohreinheit nach Fig. 2 entlang der Linie I/I;

Fig. 9

einen Längsschnitt durch eine Gießrohreinheit mit andeutungsweiser Darstellung der Gießrollen und der Seitenabdichtungen und einer separaten Aufhängung vom länglichen Gießrohrteil und vom vertikalen Gießrohrteil.

Embodiments of the invention and further advantages thereof are explained in more detail below with reference to drawings. Show it:

Fig. 1

an intermediate container and a casting tube unit according to the invention in longitudinal section;

Fig. 2

a section of a casting tube unit between the indicated casting rolls;

Fig. 3

a side view of the pouring pipe unit of Fig. 2;

Fig. 4

a variant of a casting tube unit in section between the indicated casting rolls:

Fig. 5

a side view of the pouring pipe unit of FIG. 4;

Fig. 6

a further variant of a casting tube unit in section;

Figure 7

a Längsschnift by the casting tube unit with a lower chamber and an upper chamber and a partition disposed therebetween:

Fig. 8

a longitudinal section of the casting tube unit of Figure 2 along the line I / I.

Fig. 9

a longitudinal section through a casting tube unit with hinted representation of the casting rolls and the side seals and a separate suspension from the elongated Gießrohrteil and the vertical Gießrohrteil.

Fig. 1 shows a refractory lined intermediate container 10 for casting of molten metal in a per se known strip casting machine 30 with two Casting rollers 31, by means of the particular thin steel bands of a few millimeters Thickness and a width up to two meters can be produced. From the only partial illustrated strip casting machine 30 are the casting rolls 31 and a this enclosing housing box 32 indicated.

The intermediate container 10 has a lid 15 ', a melt 13 receiving Interior and a arranged on its bottom spout 14. The melt 13 is filled by a dip tube 16 extending into the container 10, which is connected to the spout of a pan not shown in detail. A pouring spout 21 forming the spout 14 projects into the melt bath 33 the rotating casting rolls 31. The interior of the container 10 is hereby advantageously filled with inert gas. Between the container 10 and the housing cover 32, a bellows 36 enclosing the pouring tube 21 is further provided.

The container interior is in at least two with a through hole 17 with each other associated chambers 11, 12, of which in the one chamber 11th the melt 13 can be filled, while the other chamber 12 with the spout 14 is provided, wherein the flowing from the first into the second chamber 11, 12 Amount of melt by means of a control valve 19 at the passage opening 17th is adjustable.

Conveniently, a vertical partition wall 18 is provided inside the container, which is advantageously arranged off-center, so that the filling chamber 11 in volume two to thirty times as large as the chamber 12 with the spout.

Very advantageous is when pouring the bath level 13 "in the chamber 12 with the Spout 14 compared to the bath level 13 'in the other filling chamber 11 as represented lower, preferably between 10 and 50% of the bath height. With that you can just in the lower part of the pouring tube a low kinetic energy the flowing melt and accordingly constant laminar Flow conditions are achieved.

Conveniently, this designed as a plug closure control valve 19 actuated such that in the chamber 12 with the spout 14 during the Pouring a constant bath height of the melt is maintained, which is beneficial is adjustable by a control member and a meter for the bath height. For the Control valve could also be a screw cap, a sliding closure or the like be provided.

The inlet 17 'at the through-opening 17 forming nozzle 26 is the container bottom arranged offset in the filling chamber 11 upwards. This offers the advantage that from the pan in this chamber possibly reaching inclusions settle on the floor and do not get into the subsequent chamber 12.

The invention is characterized by the refractory casting tube unit 21, 21 ', to the following some design details are explained. This casting tube unit consists at least of a vertical embedded on the container bottom Gießrohrteil 21, and from a separate, emanating from this, with a horizontal extension provided elongated casting tube part 90. This tubular formed casting tube part 90 is provided with a plurality of openings distributed over the length 96 and is evenly spaced from the casting rolls 31 and arranged approximately extending over the length thereof.

Figs. 2 and 3 illustrate a refractory pouring tube unit, which is one of Container bottom projecting down vertical Gießrohrteil 21 with an inner Meteringdüse 23 and attached to this box-shaped Gießrohrteil 22 has. The latter is advantageously provided with a sufficient length, so that the melt bath 33 approximately to the outside to the side seals is supplied with so-called hot melt and parasitic solidification be prevented. This casting tube part 22 is for manufacturing reasons formed in two parts, of which the upper lid-shaped part 24 with a flange 24 'provided for attachment to the Gießrohrteil 21 and to this the lower cup-shaped part 29 by means of indicated pins 28, in particular refractory Bolt, is attached.

This pouring tube part 22 forms one connected to the central inlet opening 39 elongated channel 38 and on both sides as well as frontally away from this groove-shaped openings 34, 37. These several over the length in evenly spaced openings 34 are within the scope of the invention spaced from the lower end, so that on the one hand the from these openings 34 emerging melt a flow direction obliquely on the top and on the other hand, the channel 38 forms a kind of swamp bath, from this in it at most be deposited in the melt solid particles. It arises the further advantage that the melt flowing into this channel 38 initially distributed in this over its entire length and then in approximate equal amounts of these openings 34 exits.

Figs. 4 and 5 show a similar pouring tube unit as that of Fig. 2. It Therefore, the differences are now explained below in this casting tube unit are associated with the part 40, an upper and a lower longitudinal channel 44, 45, which are interconnected by distributed over the length of vertical holes 46 are, with the holes 46 are larger in diameter outwards. With this first longitudinal channel 44 is a throttling of the melt flow brought about before the melt through the second channel 45 and the again upwardly offset outlet openings 42 flows out.

According to FIG. 6, the turn two-part casting tube part 70 with a semicircular Cross section provided. The openings 71 are offset laterally upwards arranged so that the same advantageous effects as explained above enter.

In principle, the openings 71 may be vertical only or in addition to the lateral ones be arranged down. It is essential that by the new incoming Material no local erosion of the resulting band skin arises.

Fig. 7 and Fig. 8 show the pouring pipe unit according to the invention, in which the elongated casting tube part 90 of a horizontally extending refractory Pipe 91 on both sides each have a closure element 92 and a partition wall 95th consists. The partition wall 95 arranged approximately in the center of the tube 91 bottom part the same in an upper and in a lower chamber 93, 94, which by over the entire length of the partition in rows arranged openings 97, as holes, slots or the like are connected to each other. Nearly in the middle of the tube 91, the pouring tube part 21 protrudes through this and the dividing wall 95 and thus flows into the lower chamber 94th

The function of this casting tube unit is that the melt from Intermediate tank through the passage opening 14 of the Gießrohrteils 21 in the lower Chamber 94 flows until this chamber 94 has been filled with melt. As a result, the melt rises through the openings 97 into the upper chamber 93 and from this through openings 96 in the upper chamber delimiting Wall, so that melt targeted between the two casting rolls can flow out.

Thus, the swamp forming in the chamber 94 of the melt to be drawn off can drain at the end of the pouring are at the bottom. of the pipe 91 advantageously one or more openings provided. Also the final elements 92 may also be provided with corresponding openings.

Fig. 9 shows a variant of a casting tube unit, in which, unlike the above example, the elongated Gießrohrteil 80 not on the vertical Gießrohrteil 81, but is held on a separate suspension. This suspension 85 is in this case attached to the bottom of the intermediate container 10. There are also two conventionally configured, vertically arranged pouring tubes 81 provided in are embedded in the intermediate container 10 at a certain distance from each other and extend into the horizontal pouring tube 80. For smaller widths can also be worked only with a pouring tube.

The tubular-shaped casting tube part 80 has a plurality of lateral openings 83 and each end an extended end cover 86, in the perforations 86 ' contained, in which the suspension 85 engages. The pouring tube 80 has approximately a length like the casting rolls 31, of which in Fig. 4, the side seals 91 are illustrated. This makes this casting tube unit very much easy to manufacture, without any technical disadvantages are accepted would.

The invention is sufficient with the embodiments explained above demonstrated. However, it could be represented in other variants.

The casting tube parts could also be designed in two or more parts in the sense be, as the pipe parts are composed of corresponding pipe sections could.

Claims (6)

1. Refractory spout unit for arrangement at the outlet of a vessel containing metal melt, particularly at the outlet (14) of a tundish (10) of a strip casting plant, wherein the spout unit comprises at least one vertical refractory spout member (21, 81), which is connectable with the tundish, and a horizontally extending refractory spout member (80, 90), which goes out from the vertical spout member and which is provided with one or more openings (83, 96) distributed over the length, characterised in that the horizontal elongate spout member (80, 90) is divided by a partition (95) into an upper and a lower chamber (93, 94), wherein the outlet of the vertical spout member (21, 81) opens into the lower chamber (94) and openings (97) are provided in the partition (95), through which openings the melt flowing into the lower chamber (94) can rise into the upper chamber (93) and can flow out of this through openings (83, 96) in the wall bounding the upper chamber (93).
2. Refractory spout unit according to claim 1, characterised in that the several openings (83, 96), which are distributed over the length, of the horizontal spout member (80, 90) are arranged to be spaced upwardly from the lower end so that a sump bath is formed in the spout member.
3. Refractory spout unit according to claim 1 or 2, characterised in that the horizontal spout member (80, 90) has an approximately rectangular, triangular, polygonal, round, half-round or similar cross-section, from which the openings (83, 96) lead away at both sides as well as, preferably, at the end face.
4. Refractory spout unit according to claim 1, 2 or 3, characterised in that the elongate spout member (80, 90) is mounted independently of the vertical spout member (21, 81) at a separate suspension (85) and this one spout member (21, 81) thereby extends into the other spout member (80, 90).
5. Refractory spout unit according to one or more of claims 1 to 4, characterised in that one or more emptying openings for pouring off the melt at the end of casting are advantageously provided on the underside of the pipe (91).
6. Refractory spout unit according to one or more of claims 1 to 5, characterised in that the closure elements (92) of the elongate spout member (9) are provided in the region of the pipe (91) with emptying openings for pouring off the melt at the end of casting.

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