The invention relates to a casting pipe changing device for fixing an interchangeable casting pipe, adjustable laterally to the direction of casting for the purpose of changing, in a casting position at the spout of a metallurgical container. A casting pipe changing device at the spout of a metallurgical container typically comprises spring-loaded pressing elements that can be pressed onto guide surfaces of the casting pipe that has a tubular part and an upper plate, and the guide surfaces on the lower side of the plate are arranged to both sides of the tubular part and directed downwardly at an angle and forming a downwardly tapering plate cross-section.
Publication EP-B-1 590 114 discloses a casting pipe that comprises a lower tubular part coaxial to the casting opening axis and an upper plate. There are arranged on the lower side of the plate to both sides of the tubular part level guide surfaces which are directed downwardly at an angle in the casting direction and form a downwardly tapering plate cross-section. The interchangeable casting pipe is fixed in a casting position by means of a casting pipe changing device acting on the guide surfaces and which comprises at least one respective spring-loaded pressing element that can be pressed onto a respective guide surface of the casting pipe.
The object forming the basis of the present invention is to provide a casting pipe changing device of the type specified at the start which, by interacting with particularly advantageously configured guide surfaces of the casting pipe enables optimal compressive force transmission.
This object is achieved according to the invention by a casting pipe changing device in which the pressing elements are respectively provided with a head curved in stages or convexly or similarly, in an adjustment direction of the casting pipe and can be pressed onto a guide surface of the casting pipe that is itself curved in the longitudinal direction or in the adjustment direction.
Further preferred embodiments of the casting pipe changing device according to the invention form the subject matter of the dependent claims.
In the casting pipe changing device according to the invention the respective pressing element is pressed onto a guide surface of the casting pipe which is curved in its longitudinal direction or in the adjustment direction with a head which is curved in stages or convexly or similarly in the adjustment direction of the casting pipe, by means of which the compressive forces exerted by the pressing pins are transmitted more towards the casting pipe opening, and so more evenly. In this way, the risk of cracks occurring in the fire-resistant material, in particular at the cross-over from the plate to the tubular part, is substantially reduced. Moreover, better centering of the casting pipe in the casting position is achieved.
In the following the invention is described in more detail using the drawings. These show as follows:
The casting pipe 1 has a casting opening 3 and comprises a lower tubular part 4 coaxial to the casting opening axis a and an upper plate 5. The plate 5 has on its lower side two guide surfaces 10 disposed to both sides of the tubular part 4 and which are directed downwardly at an angle in the casting direction and form a downwardly tapering plate cross-section. The angle α enclosed by the guide surfaces 10 with the casting opening axis a can be 20° to 80°, preferably 45°, as shown. By means of the guide surfaces 10 the casting pipe 1 can be adjusted laterally to the casting direction in direction A according to
The aforementioned, spring-loaded pressing pins 2 also act on the guide surfaces 10 (in
In their longitudinal direction or in the adjustment direction A of the casting pipe 1 the two guide surfaces 10 of the plate 5 are curved in stages or convexly or in a similar manner, such as for example in an oval, a polygon, approximately round etc. Advantageously they are convexly curved in relation to a centre plane of the plate 5 extending in direction A and comprising the casting opening axis a, the radius of curvature R1 (
According to the invention the pressing pins 2 are respectively pressed resiliently against the guide surfaces 10 with a head 2a which is convexly curved in the adjustment direction A of the casting pipe 1 and has a radius of curvature R3 (
In the exemplary embodiment shown three pressing pins 2 respectively act on the respective guide surface 10. One could choose a different number of pressing pins 2. When using a number of pressing pins 2 the head height and/or the spring lift of the individual pressing pins 2 arranged next to one another is advantageously matched to the curvature of the respective guide surface 10, and so the bracing force is optimised.
In the embodiment of the casting pipe 1 shown in
Also in the version of a casting pipe 1″ shown in
In the versions according to
According to
The invention is sufficiently demonstrated by the exemplary embodiments described. It could, however, also be realised in further versions.
The curvature of the guide surfaces 10; 10′; 10″ in their longitudinal direction or in the adjustment direction A of the casting pipe 1; 1′; 1″ could theoretically also be realised by dividing the respective guide surface 10; 10′; 10″ into level sub-sections which would be at an angle to one another.
In the embodiments described above the radius of curvature formed by the respective guide surface extends either perpendicular or at an angle (e.g. 45°) to the axis a of the casting pipe. In principle, this angle could also be approximately 0°, i.e. the radius of curvature would then be aligned parallel to the axis a. Depending on how this angle is chosen, this also affects the shape of the guide surface in its longitudinal configuration.
Instead of being arranged parallel to one another, the pressing pins could also be arranged perpendicular to the curved guide surfaces or to the sub-sections forming the curvature.
In theory, at least in the casting position, the pressing pins could also be in surface contact instead of in line contact with the guide surfaces.
Number | Date | Country | Kind |
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09008614 | Jul 2009 | EP | regional |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/EP2010/003855 | 6/30/2010 | WO | 00 | 2/7/2012 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2011/000517 | 1/6/2011 | WO | A |
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Number | Date | Country | |
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20120119486 A1 | May 2012 | US |