Metallurgical apparatus – Means for melting or vaporizing metal or treating liquefied... – By means introducing treating material
Patent
1990-07-12
1991-08-06
Andrews, Melvyn J.
Metallurgical apparatus
Means for melting or vaporizing metal or treating liquefied...
By means introducing treating material
C21C 546
Patent
active
050370693
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an automatic lance changing apparatus, in particular for lances for steel production by a top blowing process, to be coupled and fastened to a lance carrier slide which can travel vertically, the materials required for refining, and also if necessary a cooling fluid, being fed to a coupling head on the lance carrier slide and transferred at the coupling point between the coupling head and the upper part of the lance into the latter, and the coupling and attachment of the lances to the coupling head of the lance carrier slide taking place by means of two diametrically opposed coupling pins on the upper part of the lance.
A novel lance of the kind mentioned above has been disclosed in the Document LU-69797 and has the great advantage, as against the prior state of the art, that it can be connected to the associated coupling head in a single step of operation, in spite of the presence of a plurality of channels for the supply of the said materials and fluids, this step of operation consisting, in the described exemplary embodiment, of manual attachment of a respective pivot bolt connection on each side of the upper part of the lance.
For this purpose, the upper part of the lance has a flange with two diametrically opposed, laterally open attachment openings for cooperation with the two pivot bolts.
In order to automate the manual attachment of, for example, the lances with the said embodiment of the upper part of the lance, an automatic lance changing apparatus is described in Document LU-86985, and is in particular intended for lances which are provided on their upper part, not with a coupling flange but with normally two coupling pins which are preferably diametrically opposed.
Since the automation apparatus described in the said Document LU-86985 works faultlessly, it is not so much the object of the invention to remedy any possible inadequacies of the state of the art, but rather its object is to provide the user of the refining lances mentioned at the beginning, with a further possibility of choice of the optimum automation solution for his specific case of application, in particular for lances with the said coupling pins. Indeed, the apparatus according to the invention has the advantage of a less complex actuating mechanism than the apparatus described in the Document LU-86985 for lances with coupling pins.
Based on an automatic lance changing apparatus of the kind mentioned at the beginning, this object is achieved by the features set out in the main claim.
An exemplary embodiment is shown in the drawings, in which like parts are provided with like reference numerals, and is described in more detail below. In the drawings,
FIG. 1 shows the front view of a section through one of the two attachment mechanisms arranged on each side of the coupling head, which is indicated in thin, continuous lines, for a lance with coupling pins;
FIG. 2 shows a side view of the subject of FIG. 1, viewed in the direction A.
It will be advantageous to consider both figures simultaneously for the following description.
A vertically displaceable attachment hook 4, which is mounted on the left, as seen in FIG. 1, on the indicated coupling head 6, is located in both figures in its highest position, in which it presses the lance, the upper part 8 of which is indicated, against the coupling head 6 by means of its coupling pin 10. Of course, an identical arrangement, not shown, is provided on the right of the coupling head 6.
The hooks 4 are in principle not designed to execute an actual pivoting motion for the release of the pin 10, but substantially only a lifting motion. If the lance 8 is to be detached in a changeover process, the two hooks 4 are lowered, so that the lance 8 is freed from the coupling head 6; it can then be taken up and removed by a transfer apparatus, not shown, such as the one indicated in FIG. 3 of the Document LU-86985. The said transfer apparatus, or a second one, now brings up a new lance 8 and suspends it with its coupling pins 10 in the hooks 4, upon which these execute a lift
REFERENCES:
patent: 4893791 (1990-01-01), Stomp et al.
Devillet Serge
Fries Daniel
Heintz Carlo
Stomp Hubert
Andrews Melvyn J.
Paul Wurth S.A.
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