MXPA00008918A - Closure plate and a slide gate on the outlet of a container containing molten metal - Google Patents

Abstract

The invention relates to a closure plate (20) for a slide gate (10) comprising a fire-resistant plate (22) and a metal jacket (33) which surrounds said fire-resistant plate. A centering means is assigned to the closure plate (20). Said centering means is formed by preferably two stopping surfaces (23, 24) which are arranged at a certain distance from one another. Each stopping surface almost at least partially rises up vertically in relation to the plate support (26) formed by the metal jacket (21) and comprises a thickness which is approximately equal to the thickness (21') of the metal jacket. These stopping surfaces (23, 24) are arranged in such a way that they lie on correspondingly configured stopping surfaces (18', 19') situated on the metal frame (14, 15) when the plate (20) is in an inserted and centered state. This plate (20) can be manufactured in an easy and economical manner.

Description

A VALVE PLATE AND A GATE TYPE VALVE SLIDING ON THE DEPARTURE OF A CONTAINER CONTAINING A MOLTEN METAL The present invention relates to a valve plate for a slide gate type valve located at the outlet of a container containing a molten metal, which includes a refractory plate, a metal envelope surrounding it and including centering means, which is designed in such a way that the valve plate can be inserted loosely into a metal frame of the slide gate type valve and is centered therein, at least in the direction (direction) of the movement; and also refers to a slide gate type valve for the same. A refractory valve plate, mentioned, according to GB-A-2 213 412 having a centering means, which is formed by a cylindrical surface formed by a concentric metallic can or bandage disposed in the passage of the flow. This cylindrical surface is formed radially outwardly and is machined such that the plate can be inserted into a metal frame in a substantially free-of-play manner. With this type of centering it is necessary to provide an exterior surface of this type. Consequently, the plate can be altered only in its configuration. In a known slidable nozzle plate disclosed in DE-A-44 33 356, the metal housing, which surrounds the plate from below and laterally, has a projection from a plurality of projections that fit into corresponding ones. entrances located in the metal frame. In the inserted state of the plate, its projections are retained with a lateral clearance of the order of 0.1 to 1 mm in the direction (direction) of the movement of the plate. Therefore, these projections must be provided with a very low tolerance, and are relatively expensive to manufacture. Unlike this prior art, the object of the present invention is to provide a valve plate of the aforementioned type, which, together with precise centering in a metal frame, can be manufactured simply and economically. This valve plate must also be dimensioned in such a way that the space required when said plates are stacked together is thereby kept at a minimum, and the risk of damaging this centering means can be eliminated to the greatest possible extent. This objective is achieved in accordance with the invention if the centering means is preferably constituted by two stop surfaces arranged with a defined spacing from each other which rise substantially at least partially vertically towards the plate support provided by the envelope. metal and having a thickness that is approximately the same as that of the metal envelope, said stop surfaces being arranged in such a way that, in the inserted and centered state of the plate, they are coupled with correspondingly configured stop surfaces located in the metallic frame. The valve plate can be manufactured in a simple manner with a structure according to the invention and said centering of the slide gate valve in a metal frame, however, it is secured, so that it can be used in an extremely high way. safe from the operational point of view. In the following, exemplary embodiments and other advantages of the invention will be explained in more detail, with reference to the accompanying drawings, in which: Figure 1 is a longitudinal sectional view of a sliding gate type valve, partly illustrated with valve plates according to the invention; Figure 2 is a longitudinal sectional view of portion II of the valve plate in Figure 1; Figure 3 is a plan view of the valve plate in line III-III of Figure 1; Figure 3 A is a cross-sectional view of the valve plate on line A-A of Figure 3; Figures 4 to 09 are longitudinal sectional views showing respective modifications of a valve plate according to the invention; Figure 10 is a plan view of a modification in a valve plate, and Figure 10 A is a longitudinal sectional view of the plate valve plate of Figure 10. Figure 1 shows a portion of the valve plate shown in FIG. a sliding gate valve, 10, located at the outlet of a container containing a molten metal, showing only the outer steel casing, 13, and a brick-refractory sleeve, 17, of the container. This container is preferably a ladle, which can be filled with molten steel, for a continuous casting installation. A refractory sleeve, 11, defines the discharge opening, 12, from this container. Immediately adjacent to this sleeve 11 is an upper valve plate 20, which is secured to the metal frame 14 of the sliding gate valve 10, and which cooperates with a mobile valve plate 20 disposed thereunder. The lower valve plate 20 serves to open and close the valve 10 and is mounted for this purpose in a longitudinally movable sliding or sliding unit, designed as a metallic frame 15 in which a discharge sleeve is also mounted, refractory, 16, adjacent to the plate 20. This sliding gate valve, 10, is designed in a conventional manner so it will not be described in detail in the following. The valve plates, 20, have a respective prefabricated metal envelope generally stamped, 21, and a plate 22 comprising a ceramic refractory material cemented therein. The cement or mortar 28 is introduced into the metal envelope 21 in a plastic state and after the insertion of the refractory plate it is dried and the latter retains firmly. This plate 20, which is manufactured separately as a unit, is then loosely inserted in its entirety in the metal frame 14, 15, and is retained therein, at least in the direction of movement, by a centering means. As can be seen in Figures 2 and 3, there are centering means associated with the valve plate 20, which, according to the present invention, is preferably constituted by two stop surfaces 23, 24, arranged with a spacing defined between them. As shown in Figure 2, these stop surfaces 23, 24 are relieved approximately vertically towards the plate support, 26, constituted by the metal shell 21, and are positioned with a height approximately equal to the thickness 21 '. ~ of the metal wrap. In the inserted and centered state of the plate 20, these Lope surfaces 23, 24, are coupled with the abutting surfaces correspondingly with the figures, 18 ', 19', in the vertical frame 14, 15, in such a way that the plate 20 is maintained therein loosely and substantially free of play in the direction of movement. To this end, the metal frame, 14, 15, has protruding noses 18, 19, with the respective abutment surfaces 18 ', 19'. These "cooperating stop" surfaces 18 ', 19' and 23, 24 are designed as perpendicular surfaces with respect to the plate supporting surface 26. They could also have the approximate configuration of a plate or be provided with A chamfer in order to achieve a more simple insertion of the plate in the frame In a particularly advantageous design, the metal casing 21 is provided with discontinuities and respective ribs bent inwards, 21 ', therein, in order to define the stop surfaces, 23, 24. The edge produced in the metal casing 21 with the discontinuity, therefore defines the corresponding abutment surface, 23, 24, which is exposed by the rib 21". curved inwards in such a way that with its edge below in the discontinuity it is arranged adjacent to the upper edge of the continuous metal frame, without any intermediate space. The advantage is that the mortar 28 can not permeate between the rib 21"and the continuous metal frame, so that the stop surface 24 will not become dirty. This rib 21 '' with the corresponding discontinuity can be manufactured in a single working step by virtue of the metal casing 21, which is produced by deep drawing. The tool mold that accommodates the metal casing and the matrix, are designed in such a way that while the matrix is forced to enter the tool mold, the metal casing is deeply embedded in a funnel shape (trough shape) and is separated in said mold. position. The abutment surface 23, 24, produced with this deep-drawing process, can be provided with a dimensional tolerance adjusted in a range of the order of tenths of mm, without the need for a special post-machining. Therefore, a valve plate of this type can be equipped with this centering means described above, in a very simple manner. As shown in Figure 3, these two elongate straight stop surfaces 23, 24 extend over the rear surface of the plate at right angles to the longitudinal axis 21 A of the plate. They are arranged at the same distance with respect to the discharge opening, 12, and are provided with a length approximately equal to half the width of the plate, and are dimensioned in such a way that the pressure forces produced in the operating state on the abutment surfaces 23, 24 of the metal casing 21 are absorbed without deformation. With this arrangement, said one of the abutment surfaces, 23, is formed on one of the sides while the other is formed on the opposite side of the discharge opening 12-and therefore between them more than half is provided. length of the plate, and that the abutment surfaces 23, 24, of the plates 20 extend outwards, away, according to the invention, there is another advantage in terms of the mounting of the plate 20 in the respective metal frame 14 , 15. The plates 20 that are at room temperature in their cold condition prior to assembly, while the metal frames 14, 15, of the slide gate valve, 10, mounted on the container are usually at a temperature approximately 200 to 300 ° C due to the previous operation. Due to this temperature difference, the plate can be introduced more easily into the respective metal frame, since the distance between the abutment surfaces 23, 24, of the plates with respect to those of the metal frames are in a few tenths of a second. millimeter smaller than in the case where there is no difference in temperature. After assembly of the slide gate valve on the container and filling of this container with the molten metal, the plates 20 as well as the metal frames 14, 15, are heated to the same temperature, for example 300 to 400 ° C Therefore, the plate extends in opposition to the metal frame to a relatively greater degree and becomes blocked in the metal frame to a certain degree. Figure 3A is a sectional view of the centering of the plate in the metal frame 15 transversely with respect to the longitudinal axis 21 A of the plate. It can be seen that the rib 21"is formed with a uniform spacing with respect to the plate support 26 and that the refractory plate 22 engages with this rib 21", preferably on its inner side. In addition to a parallel alignment, this makes possible a defined distance between the refractory plate 22 and the support 26. In addition, the nose 19 in the metal frame and the rib 21"are each provided with such a length that the rib 21"is arranged on both sides having its ends 27 very little gap with respect to the outer surface" 28 of the nose 19, in the inserted state of the plate, whereby the plate 20 is also centered to a certain degree transversely with respect to the longitudinal axis 21 A of the plate. The valve plates of the exemplary embodiments described below and shown in Figures 4 to 10, are designed similarly to the plate 20 previously described in detail. Therefore, only the differences of your specific designs will be explained below. The refractory plates 22 are preferably cemented with mortar, each of them, in the sheet metal envelope. In Figure 4 there is shown a valve plate 40 with centering means according to the invention in which both stop surfaces 43, 44 are defined adjacent to each other by a rib 41 'in the form of a strip, curved inwards, on the metal shell 41. This rib 41 'is defined laterally by two discontinuities in the metal shell 41 and arranged on one of the sides of the surface of the support plate. As for the metal frame 15, it has a rectangular nose designed in correspondence 36 on which there are respective stop surfaces corresponding to those on the plate 40. The valve plate shown in FIG. 5 differs from the plate 20, which is shown in detail in Figures 2 and 3, only in the fact that discontinuities are not provided in the ribs 51"in order to define the abutment surfaces 53, 54, but instead have been stamped in the form of grooves. in the metal casing 51. In Figure 6 there is shown a valve plate, 60, with a metal casing in which, in order to define the abutment surfaces 63, 64, two ribs 61"are provided in a manner analogous to Figure 2, but with the difference that both ribs 61"on the longer side of the support surface are arranged parallel to each other. In Figure 7 there is shown a valve plate 70 in which the centering means of according to the invention It is again designed in the form of ribs 71"provided in a metal sheath 71, as illustrated in" Figure 3; however, these ribs protrude away from the plate 22. The abutment surfaces 73, 74 are correspondingly related to the end surfaces in the ribs 71", while the abutment surfaces in the metal frame are related to elongated grooves 79 formed In Figure 8 there is shown a valve plate, 80, which is provided with abutment surfaces 83, 84, and which differs from that shown in Figure 7 only in that its refractory plate 82 is provided with serrated thickened portions. 82 'protruding into the recesses in the metal casing 81 formed by bending the ribs away from them In a valve plate 90 shown in Figure 9, the abutment surfaces 93, 94 are related to a metal strip 95 which is secured, particularly by spot welding, to the underside of the metal jacket 91. This metal strip 95 preferably has a straight configuration ngular and the side edges therein, serving as abutment surfaces 93, 94, arranged at right angles to the longitudinal axis of the plate 90. In Figures 10 and 10 A another design of a valve plate 100 is shown in FIG. wherein the abutment surfaces 103, 104 have ribs 101 ', 103' curved downwards. Said abutment surfaces 103, 104, differ in their circular configuration, whereby the circle defined by them is concentric with the discharge opening in the plate and it is thus ensured that this opening is precisely centered in the metal frame of the plate. the sliding gate valve and therefore the openings in both valve plates are arranged concentrically to each other. On the side of the plate with the smaller coupling surface there are two ribs 103 'arranged symmetrically with respect to the longitudinal axis of the plate, while on the opposite side there is a rib 61' included in the metal casing 101. These abutment surfaces they could of course be provided with a different configuration instead of a straight line or a circular configuration. It is advantageous that said abutment surfaces provided on the underside of the plate are formed directly on the metal casing, to simplify manufacturing.

However, in principle they could also be provided directly on the refractory plate, 22, particularly if the refractory plate 22 had to rest in a known manner directly on the metal frame 15 and a metal wrap between them was not provided but only one band which laterally surrounds the plate. The abutment surfaces would then be directly included in the refractory plate 22, in particular by virtue of one or two recesses in the lower side of the refractory plate 22.

Claims (12)

1. CLAIMS 1.- Valve plate for a sliding gate valve located at the outlet of a container containing molten metal, which includes a refractory plate, a metal mantle or wrapping that surrounds it and which includes a centering means that is designed from such that the valve plate can be loosely inserted into a metallic frame of the sliding gate valve and is centered therein, at least in one direction, characterized in that the centering means is preferably constituted by two stop surfaces, arranged with a given spacing from each other which rise in a substantial manner at least partially vertically towards the plate support provided by the metal casing transversely with respect to the longitudinal axis of the plate, and which have a thickness which is approximately equal to the thickness of the metal envelope, said stop surfaces being arranged in such a way that in the inserted state and centered of the plate, are coupled with stop surfaces configured in correspondence in the metal frame.
2. 2. Valve plate according to claim 1, characterized in that one of the abutment surfaces is formed on one side of the discharge opening, while the other is formed on the opposite side of the discharge opening in the valve. the plate support.
3. 3. Valve plate according to claim 1 or 2, characterized in that a distance of approximately the length of the plate is provided between one of the stop surfaces and the other stop surface of the respective plate of the metal frame, and in that the stop surfaces of the plate extend outwardly away from the discharge opening.
4. 4. Valve plate according to any one of the preceding claims, characterized in that the elongate stop surfaces extending on the underside of the plate transversely with respect to its longitudinal axis are provided with a length substantially equal to half. of the width of the plate, in such a way that the force produced in the operating state on the abutment surfaces can be absorbed without deforming the metal casing.
5. 5. Valve plate according to any one of the preceding claims, characterized in that a respective discontinuity and a rib curved inwardly out of the plane therein are formed in the metal sheath, whereby the stop surfaces are provided by the discontinuities in the metal envelope.
6. 6. Valve plate according to claim 5, characterized in that the rib is curved inwardly such that with its edge below in the discontinuity, it is disposed adjacent to the upper edge of the continuous metal frame, without any separation between them.
7. 7. Valve plate according to claim 5 or 6, characterized in that the refractory plate _ engages with the ribs bent inwardly from the plate.
8. 8. Valve plate according to any one of claims 1 to 4, characterized in that a respective discontinuity is formed in the metal casing and a rib in it protruding from the plate, with each of the surfaces of stop is provided at the end of the reactive nerve.
9. 9. Valve plate according to any one of the preceding claims, characterized in that the ribs are dimensioned in such a way with respect to the nose or with respect to the elongated slots in the metal frame, that the plate is centered not only on the direction of its longitudinal axis, but also transversally with respect to it.
10. 10. Valve plate according to claim 1 or 2, characterized in that the abutment surfaces are formed at the end edges of at least one metal strip secured to the metal sheath on the side of the plate support.
11. 11. Sliding gate valve comprising at least one metal frame to accommodate a respective valve plate according to any one of the preceding claims, characterized in that the metal frame is provided with abutment surfaces on which the plate is centered, in its inserted state, at least in the direction of movement of the metal frame.
12. 12. Sliding gate valve according to claim 6, characterized in that the stop surfaces are defined in the metal frame either on noses on projections, or in elongated grooves.