JP4506587B2 - Molten metal container - Google Patents

Description

  The present invention relates to a ladle-type molten metal holding container lined with a refractory and holding molten metal therein, and more particularly to a molten metal holding container having a non-circular shape, that is, an elliptical shape in a horizontal section. .

  A molten metal holding container that holds and conveys molten metal such as hot metal or molten steel has a structure in which a refractory lining is applied to a steel iron skin, and the shape of the horizontal cross section (planar shape) is generally Considering that the deformation of the iron skin generated by the weight of the molten metal contained in the container is uniform and the construction of the refractory is easy, it is often round.

  However, when the inner volume of the holding container is increased under conditions where the height is limited due to interference with surrounding equipment and the entire diameter cannot be expanded due to the necessity of transporting with a crane, etc. In some cases, an elliptical holding container whose diameter is expanded in only one direction may be used. There is also a report that the elevation of the molten metal bath surface formed when stirring with a mechanical stirring device can be suppressed by making the planar shape of the holding container elliptical (for example, Patent Document 1). reference).

  Typical examples of the iron shell of a holding container having an elliptical planar shape include a shape in which a straight portion is combined with a semicircle and a so-called elliptical shape having two focal points (see, for example, Patent Document 2). . However, conventionally, the construction of the lining refractory has not been studied in association with the iron skin shape.

  In other words, in the shape that is most common in an elliptical planar shape, in which the straight part is combined with a semicircle, the lining brick is likely to fall off. In FIG. 10, the schematic of the iron skin shape of the conventional ladle which has the planar shape which combined the straight part with the semicircle is shown. FIG. 10A is a plan view, and FIG. 10B is a side cross-sectional view, in which 2 is a side wall of the iron skin and 3 is a bottom of the iron skin. Usually, the width of the lining brick for molten metal is larger on the side in contact with the iron skin than the width on the side in contact with the molten metal. Due to the difference (hereinafter referred to as “fall”), the bricks are stuck together, and the bricks are prevented from coming off. When the planar shape is circular, the circumferential length on the side in contact with the molten metal is shorter than the circumferential length on the side in contact with the iron skin, so that all bricks can be provided with “fall”. .

  However, in a ladle with a flat shape that combines a straight part with a semicircle, the brick to be applied to the straight part requires a brick with a shape that does not fall, and if the wear of the brick progresses, Early dropout is likely to occur. Furthermore, when the bottom part of the ladle has a curved surface shape, in the iron-skin shape in which a straight shape is combined with a semicircle, a brick with a straight shape is required as a brick at the bottom. At the bottom, buoyancy is added to the brick while holding the molten metal, making it more susceptible to early brick shedding.

On the other hand, in the case of an ellipse having two focal points, it is possible to provide “falling” on all bricks as in the case of a circular shape. However, since the curvature of the iron skin changes continuously, the shape of the brick also has a curvature. The number of bricks is enormous, and there are many problems in terms of workability and inventory management. In addition, when construction is performed with a small number of brick shapes with an elliptical iron skin shape, adjustment at the boundary between bricks and bricks (called “joint”) is indispensable, and joints become uneven. Brick is easy to loosen and is likely to fall off early. Furthermore, when the bottom portion of the container has a curved surface shape, the brick shape of the bottom portion also becomes an enormous variety.
JP 2000-256728 A JP-A-63-130256

  The present invention has been made in view of the above circumstances, and the object of the present invention is that a molten metal holding container having an elliptical horizontal cross section can be provided with “falling” on all bricks, and has a small number of types. It is providing the molten metal holding | maintenance container which can be constructed with the brick of this.

A molten metal holding container according to a first aspect of the present invention for solving the above-mentioned problem is a molten metal holding container having a major axis and a minor axis with a non-circular iron skin shape in a horizontal section, and the molten metal holding container The shape of the iron core of the side wall is composed of a combination of two arcs with different radii , and the shape of the bottom iron skin of the molten metal holding container is to hold the molten metal with a center point forming a spherical surface and a constant radius. is constructed with a pseudo spherical formed when the center point of the plane shape of the container was drawn spherical while moving to a predetermined position on the left and right sides of the major axis direction is characterized in Rukoto.

According to a second aspect of the present invention, there is provided the molten metal holding container according to the first aspect , wherein the brick shape is divided into different ranges of the radius of the arc that forms the iron skin shape of the side wall. The area is constructed with bricks of one kind of shape.

  In the present invention, since the iron shell side wall of the molten metal holding container having an elliptical planar shape is configured by a combination of two arcs having different radii, bricks having two shapes matching the radius are provided for each range having different radii. It is possible to line the lining alone, and it is possible to provide “falling” on all the bricks, and it is not necessary to adjust the joints, so that the bricks can be prevented from falling off early. In addition, when the shape of the bottom of the molten metal holding container is a pseudo-spherical surface in which a spherical surface is drawn with the same radius and changing the center position, no straight part is installed on the bottom part, and all the construction to be performed on the bottom part is performed. It is possible to provide “falling” on the bricks and to minimize the number of brick shapes. In other words, according to the present invention, the shape of the molten metal holding container having an elliptical planar shape is designed in consideration of the configuration of the lining bricks, so that the bricks in use can be prevented from falling off early and cost can be reduced. In addition, the number of brick shapes can be minimized, and problems in brick construction and inventory management can be avoided.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 are views showing an embodiment of the present invention, in which FIG. 1 is a plan sectional view showing an example of an iron skin shape of a molten metal holding container according to the present invention, and FIG. 2 is a side cross-sectional view of an iron skin shape of a molten metal holding container shown in FIG.

  As shown in FIG. 1, the molten metal holding container 1 having a non-circular iron skin shape in a horizontal cross section according to the present invention has a curved surface obtained by combining two types of arcs having a radius A and a radius B. It is configured. Specifically, an arc of radius B is drawn around the intersection of the perpendicular major axis and minor axis, that is, the point OB1 displaced on the minor axis from the central point of the molten metal holding container 1, and similarly melted. An arc having a radius B is drawn on the minor axis of the metal holding container 1 on the minor axis, with a point OB2 displaced by an equal distance on the opposite side of the point OB1. Further, an arc is drawn with a radius A that is connected to an arc of radius B with the point OA1 and the point OA2 displaced on the major axis from the center point of the molten metal holding container 1 as the center. Thus, the iron skin side wall 2 of the molten metal holding | maintenance container 1 which concerns on this invention is comprised by the curved surface formed. Further, in this example, as shown in FIG. 2, the iron skin side wall 2 is straight in the vertical direction, and the iron skin bottom 3 is convex downward.

  In FIG. 3, the top view of the brick construction example of the side wall part of the molten metal holding container 1 is shown. As shown in FIG. 3, since the iron shell side wall 2 is formed of two types of arcs, the lining brick 4 has two types: a brick of shape a in the range of radius A and a brick of shape b in the range of radius B. It is possible to work without adjusting the joints by using only the bricks of the shape, and both the bricks of the shape a and the bricks of the shape b have “falling”, so that the bricks in use are quickly dropped. Can be prevented.

  The ratio of the major axis D1 and the minor axis D2 to the radius A and the radius B is not particularly specified, but in order to stabilize the brick structurally, the radius A is 1/4 or more of the major axis D1 (radius A ≧ major axis D1). / 4), the radius B is preferably ½ or more of the major axis D1 (radius B ≧ major axis D1 / 2).

FIG. 4 shows the shape of the iron skin bottom 3 of the molten metal holding container 1 according to the present invention. FIG. 4A shows a cut surface along the short axis, and FIG. 4B shows a cut surface along the long axis. A point O ₀ shown in FIG. 4 is a line perpendicular to the intersection of the orthogonal major axis and minor axis (the center point of the molten metal holding container 1), that is, one axis existing on the axial center line of the molten metal holding container 1. It is a point. If the iron skin side wall is circular, the shape of the iron skin bottom can be constituted by a spherical surface centered on the point O ₀ , but the molten metal holding container 1 according to the present invention has a non-circular iron side wall 2. Therefore, the shape of the iron bottom 3 cannot be formed by a sphere centered at the point O ₀ . Therefore, in the present invention, as shown in FIG. 4B, a center point O ₀ that draws a spherical surface having a radius C is defined as a line perpendicular to the point OA 1 shown in FIG. 1 on the major axis (“point OA 1 axis”). It is formed by the outermost shell of the spherical surface drawn at this time by moving the range from the intersection O ₀₁ to the intersection O ₀₂ to the line perpendicular to the point OA 2 (denoted as “point OA 2 axis”) The shape of the iron skin bottom 3 is determined by the pseudo spherical surface. When viewed from a direction parallel to the minor axis as shown in FIG. 4B, the range corresponding to the intersection point O ₀₁ to the intersection point O ₀₂ looks linear, but this range is also shown in FIG. 4A. Thus, when viewed from a direction parallel to the major axis, the shape of the iron bottom 3 is determined in this way, so that all the iron bottoms 3 have a radius C and are convex downward. Can be spherical. It should be noted that the boundary between the iron skin side wall 2 and the iron skin bottom portion 3 has a radius D smaller than the radius C by changing the radius.

  5 and 6 show an example of brick construction at the bottom of the molten metal holding container 1 in which the shape of the iron skin bottom 3 is determined in this way. FIG. 5 is a side sectional view, FIG. 6 is a plan view, FIG. 5A shows a cut surface along the short axis, and FIG. 5B shows a cut surface along the long axis.

  As shown in FIG. 6, the construction method of the lining brick 4 has a structure in which the lining brick 4 is arranged in a circumferential shape when viewed from above. In this example, as the cross-sectional shape, almost the entire area of the bottom 3 of the skin is designed with a curved surface of radius C, and at the same time, the shape of the side wall 2 of the skin is a shape combining two types of curved surfaces of radius A and radius B. Therefore, even in the construction of the bottom portion, it is possible to perform construction without adjusting the joints with only two shape lining bricks per ring of the lining brick 4, and it is possible to provide “fall” in all the lining bricks 4, It is possible to prevent the lining brick 4 from falling off early. In FIG. 6, the lining brick 4 is constructed with nine rings, but the number of rings is appropriately changed according to the size of the molten metal holding container 1 and the size of the lining brick 4 to be used.

  Although the molten metal holding container 1 described above has a pseudo spherical surface with the iron shell bottom portion 3 protruding downward, in the present invention, the iron shell bottom portion 3 may be a flat surface as shown in FIG. However, in the case where the iron skin bottom 3 is a flat surface, the floating of the lining brick 4 is more susceptible than the case where the iron skin bottom 3 is a downwardly convex pseudo-spherical surface, so that point should be taken into consideration. There is a need. FIG. 7 is a view showing another shape of the molten metal holding container 1 according to the present invention.

  Thus, since the molten metal holding | maintenance container 1 which concerns on this invention is comprised by the combination of two circular arcs from which a radius differs, the shape 2 of the molten metal holding | maintenance container 1 match | combined with the radius for every range from which a radius differs The lining brick 4 can be lined only, and all the lining bricks 4 can be provided with “fall”, and no adjustment of joints is required, so that the lining brick 4 can be prevented from falling off early. it can.

  Examples of the present invention will be described below.

  The present invention was applied to the iron skin shape of the elliptical hot metal holding container. FIG. 8 shows a plan view of a hot metal holding container to which the present invention is applied, and FIG. 9 shows a sectional view of the bottom of the hot metal holding container to which the present invention is applied. FIG. 9A shows a cut surface along the short axis, and FIG. 9B shows a cut surface along the long axis.

  The iron side wall has a shape in which an arc having a radius of 2000 mm and a radius of 2800 mm is combined, and the major axis is 4500 mm and the minor axis is 4100 mm. In order to make the joint between the bricks uniform, the lining brick has a shape with a radius of 2000 mm having an inner surface of 133 mm and an iron skin side of 147 mm, and a radius of 2800 mm with a shape of an inner surface of 142 mm and an iron skin side of 152 mm. The shape of the bottom of the iron shell is set to a radius of 3100 mm, and the center point forming the spherical surface is moved from the center point of the planar shape of the molten metal holding container to a predetermined position to the left and right in the major axis direction as described above. The pseudo-spherical surface is formed. Moreover, the construction method of the lining brick of a bottom part was made into the structure where the lining brick was arrange | positioned circularly seeing from the upper surface, and it constructed | assembled with 2 shapes brick per ring of lining brick.

  In order to confirm the effect, as shown in FIG. 10, the planar shape is a shape in which a straight part is provided in a semicircle, and a comparison with a conventional hot metal holding container in which the straight part is also combined with the bottom of the iron skin is performed. It was. 10A and 10B are schematic views of a conventional iron shell shape of a hot metal holding container, in which FIG. 10A is a plan view and FIG. 10B is a side sectional view.

  As a result of confirming the number of service life using these two hot metal holding containers, in the conventional shape hot metal holding container, the straight brick on the side wall dropped out after 213 times of use, and it was repaired. As a result of checking at the time of repair, it was estimated that in the straight shape part at the bottom, the hot metal had infiltrated the iron core side of the lining brick, and the lining brick was slightly lifted. On the other hand, when the hot metal holding container to which the present invention was applied was used 287 times, the wear of the brick progressed, and the dropout occurred at the portion where the thickness became thin, and the repair started. In the confirmation at the time of repair, intrusion of bullion into the back of the lining brick at the bottom was not observed.

  Thus, by applying the present invention, the service life of the hot metal holding container was improved, and a significant reduction in manufacturing cost could be achieved.

It is a plane sectional view showing one example of the iron skin shape of the molten metal holding container concerning the present invention. It is side surface sectional drawing of the iron-skin shape of the molten metal holding | maintenance container shown in FIG. It is a top view of the brick construction example of the side wall part of the molten metal holding container which concerns on this invention. It is a figure which shows the shape of the iron-skin bottom part of the molten metal holding | maintenance container which concerns on this invention, (A) represents the cut surface in a minor axis, (B) represents the cut surface in a major axis. It is side surface sectional drawing which shows the example of the brick construction of the bottom part of the molten metal holding | maintenance container which concerns on this invention, (A) represents the cut surface in a minor axis, (B) represents the cut surface in a major axis. . It is a top view which shows the example of the brick construction of the bottom part of the molten metal holding | maintenance container which concerns on this invention. It is a side view which shows the other shape of the molten metal holding | maintenance container which concerns on this invention. It is a top view of the hot metal holding | maintenance container used in the Example. It is sectional drawing of the bottom part of the hot metal holding | maintenance container used in the Example, (A) represents the cut surface in a short axis, (B) represents the cut surface in a long axis. It is the schematic of the iron skin shape of the conventional hot metal holding | maintenance container, (A) is a top view, (B) is side sectional drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Molten metal holding container 2 Iron skin side wall 3 Iron skin bottom part 4 Lined brick

Claims (2)

A molten metal holding container having a major axis and a minor axis, wherein the iron shell shape of the horizontal cross section is non-circular, and the iron skin shape of the side wall of the molten metal holding container is composed of a combination of two arcs having different radii , In addition, the shape of the bottom iron skin of the molten metal holding container is such that the center point forming the spherical surface is moved from the center point of the planar shape of the molten metal holding container to the left and right in the major axis direction to a predetermined position with a constant radius. characterized Rukoto consists of a pseudo sphere formed upon to draw the spherical while the molten metal holding vessel. The brick shape is divided for each range having a different radius of the arc forming the iron skin shape of the side wall, and each range is constructed with one type of brick according to the radius of the arc. Item 2. A molten metal holding container according to Item 1 .

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