EP2268432B1 - Closing plate and sliding closure on the spout of a receptacle for molten metal - Google Patents

Description

The invention relates to a closure plate for a sliding closure at the spout of a container for molten metal, in particular a converter, according to the preamble of claim 1 and a sliding closure according to claim 4.

In the publication EP-A-0 468 363 a device for changing a casting tube is disclosed, in which in one embodiment, base plates are provided which are displaceable between the casting tube and a fixed base plate in the casting position. When changing a new base plate can be brought into the casting position while the worn plate are pushed away by this new. Andeutungsweise bevels are provided at both ends bevels in this base plate on one side of the sliding surfaces. However, there is neither an indication of purpose nor a concrete training of these chamfers.

In another refractory closure plate according to the document JP-A-2-59855 are indicated in the sliding surfaces chamfers or radii seen at the transverse sides in the direction of displacement, but which does not have a function to intervene with another plate. Slide closures on the spout of containers for molten metal are known in various designs. A sliding closure, which is used in particular for opening and closing a converter spout opening is, for example, in EP 0 819 488 B1 disclosed. It comprises a housing frame in which a stationary refractory closure plate (a so-called bottom plate) and one of these opposite sliding, held in a slide unit refractory slide plate are arranged. The slide plate is sealingly pressed with its upper sliding surface to a lower sliding surface of the bottom plate. The housing frame is detachably mounted on a container-fixed base plate, wherein the bottom plate is clamped on its upper sliding surface with a refractory spout head used in the base plate. In the casting operation, the refractory parts are exposed to heavy wear. It is therefore necessary to exchange them relatively frequently. For this, the housing frame must be detached from the base plate in each case.

Experience has shown that when using the sliding closure on the converter spout, in particular, the bottom plate wears very quickly, it is according to the WO2009127333 A1 provided to arrange slidably in the rack a cassette with at least two bottom plates, which can be removed by the displacement of a worn bottom plate from the operating position and replaced by another bottom plate without the case frame must be removed from the base plate. This makes it possible to maintain the casting operation longer until the replacement of the other refractory parts is due.

The closure plates for a sliding closure are known to each include a surrounded by a metal jacket, elongated refractory plate, which may also be multi-part.

The present invention has for its object to provide a closure plate for a sliding closure on the spout of a container for molten metal, in particular a converter, which allows a particularly gentle clamping with another closure plate or with a refractory spout headboard. Furthermore, a suitable especially for converter sliding closure should be further improved.

This object is achieved according to the invention by a closure plate with the features of claim 1 and by a sliding closure with the features of claim 4.

Further preferred embodiments of the inventive closure plate form the subject of the dependent claims.

With the closure plate according to the invention, the risk of damage to the end faces of the refractory parts to be clamped together when introducing the tension and / or during relative adjustment of the mutually strained refractory parts can be considerably reduced.

Fig. 1

ein Ausführungsbeispiel einer erfindungsgemässen Verschlussplatte im Längsschnitt;

Fig. 2

die Verschlussplatte nach Fig. 1 in Draufsicht;

Fig. 3

einen Schnitt entlang der Linie III-III in Fig. 2;

Fig. 4

einen Detail X aus Fig. 3 in vergrössertem Massstab;

Fig. 5

im Längsschnitt ein Ausführungsbeispiel eines Schiebeverschlusses beim Einschwenken an den Ausguss eines Konverters;

Fig. 6

den Schiebeverschluss nach Fig. 5 im Querschnitt, mit einer sich in einer Ausgangsstellung befindenden, zwei Bodenplatten enthaltenden Kassette; und

Fig. 7

den Schiebeverschluss nach Fig. 5 im Querschnitt, mit der Kassette in einer Endstellung.

The invention will be explained in more detail with reference to the drawing. Show it:

Fig. 1

an embodiment of an inventive closure plate in longitudinal section;

Fig. 2

the closure plate after Fig. 1 in plan view;

Fig. 3

a section along the line III-III in Fig. 2 ;

Fig. 4

a detail X out Fig. 3 on an enlarged scale;

Fig. 5

in longitudinal section an embodiment of a sliding closure when swung to the spout of a converter;

Fig. 6

after the sliding closure Fig. 5 in cross-section, with a present in a starting position, two bottom plates containing cassette; and

Fig. 7

after the sliding closure Fig. 5 in cross-section, with the cassette in an end position.

In Fig.1 to Fig.4 a closure plate 10 for a sliding closure is shown at the spout of a container for molten metal. It may, for example, a so-called bottom plate of a in Fig. 5 to 7 Shut-off closure 1 shown in more detail act for a converter, as will be described in more detail below. The closure plate 10 has an elongated shape and optionally an octagonal outer contour. It comprises a multi-part refractory plate 11 and a metal jacket 12 surrounding it. The refractory plate 11 provided with a spout opening 13 has a lower sliding surface 14 and an upper sliding surface 15. The refractory plate 11 is clamped on the one hand on the lower sliding surface 14 with a slide plate 20 of the sliding closure 1 and on the other hand via the upper sliding surface 15 with a lower sliding surface 21 'of a refractory container spout head part 21.

The refractory plate 11 has in a projecting out of the metal jacket 12 area at least along the upper sliding surface 15 bounding side with the sliding surface 15 an angle α enclosing chamfer 26 along one of the two narrow sides 16, 17, wherein the angle α preferably between 10 ° and 15 °. In addition, in the case of the refractory plate 11, in addition to the chamfer 26, there is in each case a chamfer 28, 29 in the sliding surface 14, which are assigned to the two longitudinal sides 18, 19 which are parallel to the longitudinal axis L.

As already mentioned, the closure plate 10 according to the invention can act as a stationary base plate in a housing frame 30 of the sliding closure 1 Fig. 5 be accommodated in which housing frame 30, a slide unit 31 is slidably disposed with the slide plate 20, wherein the longitudinal axis L of the closure plate 10 in the direction of displacement of the slide closure 1 extends. The housing frame 30 is removably mounted on a container-fixed base plate 32. Suspension means are preferably provided for the pivotable arrangement of the housing frame 30 on the container-fixed base plate 32, wherein the pivot axis A extends transversely to the direction of displacement of the slide unit 31.

In Fig. 5 in particular illustrates how the housing frame 30 is pivoted with the refractory parts mounted therein about the axis A and then fixed by means not shown fixing means on the base plate 32, wherein the refractory parts are braced over existing in the housing frame 30 spring members.

With the chamfer 26 according to the invention of the closer to the pivot axis A narrow side 16 of the refractory plate 11 is largely avoided that when touching the bottom plate with the lower sliding surface 21 'of the container-mounted base plate 32 built refractory spout head 21 to damage this normally made of ceramic material existing refractory parts comes. As an additional security, the spring members are designed with such a spring characteristic that initially only very low contact forces in this first striking with the head part 21 bevel 26 of the refractory plate 11 comes into contact before the full spring force on the surface of the head part 21 adjacent plate 11 for Effect comes.

At the sliding closure 1 after Fig. 6 and Fig. 7 the housing frame 30 includes a transversely to the direction of displacement of the slide unit 20 slidable cassette 40 with at least two serving as bottom plates closure plates 10a, 10b, wherein the one closure plate 10a by moving the cassette 40 from the operating position to Fig. 6 removed and replaced by the other closure plate 10b ( Fig. 7 ), without the housing frame 30 must be dismantled. The exact structure and operation of such a sliding closure is the earlier mentioned WO2009127333 A1 and is therefore not described in detail.

According to the invention, the refractory plates 11 of all the closure plates 10a, 10b at least along the front with respect to the cassette shift longitudinal sides 18, 19 provided with bevels 28, 29 to clamped in the mutual displacement of the full contact force with each other Refractory parts to avoid damage to their sliding surfaces. Preferably, both longitudinal sides 18, 19 of the respective refractory plate 11 are provided with chamfers 28, 29, in particular if for the purpose of simplification of the exchange process a forward and backward Return displacement of the cassette 40 is provided.

Serving as a stationary bottom plate closure plate 10 could well on the slide plate 20 associated sliding surface 14 on the narrow sides 16, 17 have bevels or the slide plate 20 itself could be provided with such bevels.

Such a slide plate could also be formed on the side facing away from the sliding surface with a known spring and thus be provided only on one side with a sliding surface, be provided in the context of the invention, for example, on the one narrow side of the sliding surface such a chamfer could, so that if the slide plate when swiveling the slide unit by way of a flat contact by this bevel would not come into contact edgewise to the bottom plate.

The invention is sufficiently demonstrated with the illustrated embodiments. But you could still be executed by additional variants. So it may be at the surrounding the refractory plate 11 metal jacket 12 to a deep-drawn sheet, a bandage or act on a cassette frame or the like.

This chamfering according to the invention in the case of the refractory plate could not be provided over the entire length but only in a partial region in the case of a plate form in which the outer sides run obliquely to the longitudinal axis L of the plate or these outer sides are rounded.

Claims (9)

1. Closing plate for a sliding closure on the spout of a receptacle for molten metal, in particular of a converter, comprising a refractory plate (11) with an elongate plate's longitudinal axis (L) and a sheet metal jacket (12) surrounding the latter, wherein the refractory plate (11) with a spout opening being located on the longitudinal axis (L) is braceable via sliding surfaces (14, 15) with a such type of another refractory closing plate or with a sliding surface (21') of a refractory head part (21), characterised in that
   the refractory plate (11) has a tapering section (28, 29), which forms an angle (α) with the sliding surface (14) on the other side of the sliding surface (15), thus at least along the longitudinal sides (18, 19) delimiting the sliding surface (14) on the other side of the sliding surface (15), said longitudinal sides (18, 19) extend parallel to the plate's longitudinal axis (L), said tapering surface being associated with a section of the refractory plate (11) that projects beyond the sheet metal jacket (12).
2. Closing plate according to Claim 1, characterised in that the angle (α) of this tapering section (26, 28, 29) is between 10° and 15°.
3. Closing plate according to Claim 1 or 2, characterised in that the tapering section (26) is associated with a narrow side (16) of the refractory plate (11) directed at a right angle to the plate's longitudinal axis (L).
4. Sliding closure on the spout of a receptacle for molten metal, in particular of a converter, comprising a closing plate (10) according to any of Claims 1 to 3, characterised in that
   the closing plate (10) is accommodated as a stationary base plate in a housing frame (30) that can be attached to a base plate (32) fixed to the receptacle, in which a sliding unit (31) provided with a sliding plate (20) can be disposed displaceable, wherein the plate's longitudinal axis (L) is extending in the direction of displacement of the sliding unit (31), wherein the closing plate (10) respective its refractory plate (11) provided with the tapering sections (26, 28, 29) being braceable with its sliding surface (15) with a sliding surface (21') of a refractory spout head part (21) inserted into the base plate (32).
5. Sliding closure according to Claim 4, characterised in that suspension means are provided for the pivotable arrangement of the housing frame (30) on the base plate (32) fixed to the receptacle and fixing means for the releaseable fastening of the latter, wherein the pivot axis (A) is extending at a right angle to the direction of the displacement of the sliding unit (31), wherein the narrow side (16) of the refractory plate (11) lying closer to the pivot axis (A) being provided with the tapering section (26).
6. Sliding closure according to Claim 4 or 5, characterised in that there is displaceable disposed in the housing frame (30) a case (40), which contains in addition to the one closing plate (10a) at least one further, identically formed closing plate (10b), wherein the further closing plate (10b) can be brought into an operating position by displacing the case (40) and so the case (10a) is replaceable.
7. Sliding closure according to Claim 6, characterised in that the direction of displacement of the cassette (40) extends at a right angle to the direction of displacement of the sliding unit (31).
8. Sliding closure according to Claim 7, characterised in that the refractory plates (11) of all of the closing plates (10a, 10b) have tapering sections (28, 29) at least along the longitudinal sides (18, 19) to the front in relation to the case displacement.
9. Sliding closure according to any one of the Claims 6 to 8, characterised in that the case (40) can be displaced to and fro between its initial position and its final position, wherein both longitudinal sides (18, 19) of the respective refractory plate (11) having tapering sections (28, 29).

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