Device for spraying a coating on the internal surface of a vesse

Details Device for spraying a coating on the internal surface of a vesse Device for spraying a coating on the internal surface of a vesse

1989-09-19

1991-08-06

Wityshyn, Michael

Coating processes

Interior of hollow article coating

Spraying

118696, 118704, 118317, 118323, 239753, 239227, 239264, 427421, B05D 102, B05B 1304, B05B 1306

Patent

active

050376721

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a device for spraying a refractory and/or heat-insulating and/or water-repellent coating on the internal faces of a vessel such as a tundish for transferring molten metal, said coating being either permanent or else a wearing coating according to requirements.
The invention is also directed to a method for the practical application of the device in accordance with the invention.
A coating of this type is described, for example, in French patent No. 2,585,273 granted to the present Applicant.
In French patent Applications No. 87 04694 of Apr. 3rd, 1987 and No. 87 11466 of Aug. 12th, 1987, the present Applicant describes in addition a machine for preparing and spraying a similar coating.
A method of coating which is already known consists in pouring the coating composition into the space located between a former and the internal surface of the vessel to be coated.
The use of a former of this type is unpractical and does not make it possible to modify the thickness of the coating at will.
At the present time, in order to spray a coating of this type into a transfer vessel, use is made of a robot having articulated arms, the movements of which are remote-controlled.
A robot of this type is of heavy and complex construction, with the result that it is very costly.
There has also been proposed a spraying device comprising a beam fixed above a small transfer vessel along the longitudinal axis of this latter, a carriage for supporting the lance used for spraying the coating being capable of displacement in translational motion on said beam. This device is economical but is suitable only for metallurgical vessels of small size. Moreover, the device does not make it possible to spray the coating at a constant distance between the head of the spraying lance and the internal faces of the vessel, with the result that the coating has irregular compactness, which is unacceptable.
This device is unsuitable, especially in the case of transfer vessels which have non-parallelepipedal geometrical shapes and the side walls of which are not vertical but inclined.
The object of the present invention is to overcome the disadvantages of known designs by producing a spraying device of simple and inexpensive construction which makes it possible to obtain a coating of uniform compactness irrespective of the dimensions and shape of the transfer vessels.
The device contemplated by the invention for spraying a coating onto the internal faces of a vessel for the transfer of molten metal comprises a spraying lance secured vertically to a carriage which is displaceable in a horizontal plane located above the transfer vessel.
In accordance with the invention, this device is characterized in that the carriage is capable of displacement in translational motion on a guide which extends in a first longitudinal or transverse direction of the transfer vessel, that said guide is in turn capable of displacement in translational motion on guiding means extending in a second direction which is transverse with respect to the direction aforesaid, that said guiding means are themselves mounted on a support which is capable of displacement in translational motion in the longitudinal direction of the vessel, and that means are provided for controlling the various movements of the spraying lance in such a manner as to maintain the spraying head of said lance at a substantially constant distance from the lateral faces or from the bottom face of the transfer vessel.
In view of the fact that the spraying device as a whole can be displaced in the longitudinal direction of the transfer vessel, said device can be of smaller overall length than the vessel and is thus suitable for vessels having both small and large dimensions.
In view of the fact that the carriage is capable of moving in a direction transverse to the length of the vessel, it is possible to adjust the distance between the head of the spraying lance and the side wall of the vessel, even when this side wall is not vertical but inclined or else not parallel to the lon

REFERENCES:
patent: 3606162 (1971-09-01), Lehmann
patent: 4564410 (1986-01-01), Clitheros et al.
patent: 4850382 (1989-07-01), Williams
patent: 4872417 (1989-10-01), Kuwabara et al.
patent: 4908234 (1990-03-01), Daussan et al.
patent: 4951600 (1990-08-01), Soshi et al.
"Robotic Gunning System for Coating a Tundish", Iron and Steel Engineer, vol. 64, No. 12, Dec. 1987, by S. Nonaka et al., pp. 19-23.

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