JPH10113764A - Transporting vessel of molten metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the capacity of molten steel in a ladle without increasing the height of the ladle. SOLUTION: In the horizontal cross sectional shape of the ladle basing on an elliptic shape 3 as a reference, the circular arcs in the major axial side, in which the minor axial points P1 of the elliptical shape 3 are commonly used and the center points O1 are put on the extended minor axial line A connected with the minor axial points P1 and a radius R1 selected so as to position to the outside of the elliptical shape 3 is used, are drawn so as to be faced to the inner surface sides. On the other hand, the circular arcs in the minor axial side, in which the major axial points P2 of the elliptical shape 3 are commonly used and the center points O2 are put on the major axial line B connected with the major axial points P2 and a radius r1 selected so as to position to the outside of the elliptical shape 3 is used, are drawn so as to be faced to the inner surface sides. The circular arcs in the major axial side and the circular arcs in the minor axial side drawn so as to be faced in each axis, are made to a complex circular arc shape combined so as to form a smooth curve through four jointing points Q. The ladle having the complex circular arc shape 1 can increase the capacity of molten steel more than that of the elliptic shape 3 and at the same time, the rigidity of an iron shell in the major axial part can be strengthened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transport container such as a ladle used for refining and transporting molten metal in a steel mill at an ironworks.

[0002]

2. Description of the Related Art In the process of refining molten metal, a ladle is used as a transport container. Generally, a ladle 10 having a circular horizontal section is used. The circular ladle 10 has a hook 6 attached to a crane sheave 5.
Is transported by hooking it on a trunnion 7 provided on a circular ladle (see FIGS. 6 and 7).
In order to reduce the refining cost, it is effective to increase the amount of molten metal processed or transported per ladle. However, increasing the size of the circular ladle requires modification of existing facilities, and is often subject to dimensional restrictions.

For example, when there is a restriction in the height direction, the horizontal sectional area of the ladle is increased. As a measure, the horizontal sectional shape of the ladle is changed as shown in FIG. It is conceivable to use an oval shape 2 or an elliptical shape 3 as shown in FIG. In this case, since the width of the hook 6 attached to the crane sheave 5 is fixed, in order to increase the horizontal cross-sectional area of the ladle, the minor diameter of the ladle should be adjusted to the width of the hook 6 and the ladle long side should be set. The trunnion 7 is provided in the portion to increase the length in the major axis direction.

[0004]

The inner surface as shown in FIG.
With the sides facing each other, and the distance of the center point is L_ThreeRadius R separated_Two
And the straight line connecting the ends of this semicircle.
Oval shape to be formed, that is, (radius R on short side_TwoHaving
(Semicircular length) × 2 and (Length side straight line length L)_Three) × 2
The perimeter of the added oval 2 and the focal length shown in FIG.
L_Four, Radius R of the long diameter portion _ThreeWith the circumference of the elliptical shape 3 having
Were compared in a state where the major axis and the minor axis of the two were matched.
In this case, an elliptical shape 3 is used when the elliptical shape 2 is used.
Longer than in the case, the ladle horizontal cross-sectional area becomes larger.

However, in the oval ladle 2 shown in FIG. 3 and the oval ladle 3 shown in FIG. 4, crane hooks (not shown) are attached to trunnions (not shown) disposed on the long sides 2A and 3A, respectively. In the case of a ladle with an elliptical shape 2, the force F applied to the linear portion of the long side 2A gives
As shown by the dotted line, the ladle iron skin of the long side portion 2A has a concave shape protruding inward, and the refractory applied inside has peeling or falling off. On the other hand, the ladle of elliptical shape 3 also has a long side 3A
However, since the long side 3A forms an elliptical minor-diameter arc, the ladle iron skin generated by the force F is not deformed, and the influence on the refractory constructed inside is It becomes smaller than in the case of the oval shape 2.

That is, when the short-diameter distance L ₁ and the long-diameter distance L ₂ have the same length as shown in FIG. In terms of capacity, the elliptical shape 2 is advantageous because it has a larger cross-sectional area in the horizontal direction than the elliptical shape 3, but in terms of ladle rigidity, the elliptical shape 3 has a longer length than the elliptical shape 2. linear portion L ₃ does not deform into (here attaching the trunnion) without ladle furnace shell be advantageous effect on the refractory coming from the deformation of the ladle furnace shell is reduced, reducing the fire MonoHara units it can.

[0007] The present invention solves the above-mentioned problems of the prior art, and when increasing the capacity of a conventional circular ladle, if an existing facility has restrictions in the height direction when the equipment is modified, an elliptical shape is required. It is an object of the present invention to provide a container for transporting molten metal, which can take advantage of the advantages of the above ladle and the advantages of the elliptical ladle.

[0008]

According to a first aspect of the present invention, there is provided a transport container for transporting molten metal, wherein the horizontal cross-sectional shape of the transport container is a predetermined elliptical shape. On the basis, the two short-diameter points are shared and the center point is on the short-diameter center line connecting the short-diameter points, and the long-side arc is defined by the radius selected to be located outside the elliptical shape on the inner side. On the other hand, the ellipse shares two major axis points and has a center point on a major axis center line connecting the major points, and the shorter side arc is formed by a radius selected to be located outside the elliptic curve. Are drawn with their inner surfaces facing each other, and the long side arc and the short side arc drawn facing each other are combined into a smooth arc through four joints to form a composite arc shape. It is a container for transporting molten metal.

According to a second aspect of the present invention, when the four joint points of the long side arc and the short side arc drawn opposite to each other are bent, the joint points become a smooth curve. 2. The molten metal transport container according to claim 1, wherein the composite arc shape is corrected as described above.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. The present invention, as shown in FIG. 1, and two semicircles facing the inner surface of the radius R ₂ that the separation between the center point O ₃ by L _3, the length L ₃ connecting the end portion T of the semicircle The shape obtained by adding the elliptical shape 2 formed by the above-described straight portion, that is, the sum of (a semicircular length having a radius R ₂ on the shorter side) × 2 and (the length L ₃ of the straight portion on the longer side) × 2 The distance between the oval shape 2 having the length and the two elliptical focal points S is L ₄ , the elliptical radius R ₃ of the major axis portion, and the distance from the two elliptical focal points S (l ₁ +
l ₂ ) = elliptical shape 3 formed by the locus of point P to be constant
Preparative, when to match the short diameter L ₁ and the major axis L ₂ of both between the oval 2 and elliptical 3 draw a composite arc shape 1, using a ladle of the composite arcuate 1 .

[0011] Composite arcuate 1, the elliptical shape 3 as a reference, the center point O on the short diameter central line A connecting the short径点P ₁ with share two short径点P ₁ of the elliptical shape 3 ₁ and a long-side arc 1A having a radius R ₁ selected to be located outside the curve of the elliptical shape 3 with its inner surface facing the other side, while two long-diameter points P ₂ of the elliptical shape 3 are drawn. having a center point O ₂ on the major axis center line B that connects the major axis point P ₂ while sharing the inner surface of the short sides arc 1B having a radius r ₁ which is selected to be positioned outside of the curve of the elliptical shape 3 The sides are drawn facing each other, and the long side arc 1A and the short side arc 1B drawn facing each other are combined so that the four joining points Q form a smooth curve.

It should be noted that the long side arcs 1A and 1A drawn opposite to each other
And the short side arc 1B are excessively bent at the four joint points Q.
The strength of the ladle is reduced, and it is difficult to load refractories.
The joint Q is a smooth curve
It is preferable to modify the composite arc shape so that This
Here, as is apparent from FIG.₁And major axis point
P_TwoExcluding, the ellipse radius R of the short side of the elliptical shape 3_Three(Long
Major axis point P on the diameter center line B_TwoElliptical radius R of_Three=
l₁, R_Three+ Distance L of elliptical focal point S_Four= L_TwoAnd the ellipse
Point P is distance (l₁+ L_Two) = Constant, ellipse on the short side
Radius R_ThreeIs the major axis point P_TwoTo minor axis point P ₁Curvature in direction
(Changes with increasing radius) <short side of composite arc shape 1
Radius r₁<Radius R of long diameter part of oval shape 2_TwoBecomes Ma
The ellipse radius R of the long side of the elliptical shape 3_Three(Long side ellipse
Radius is major point P_TwoElliptical radius R of_ThreeIs the distance (l₁+ L_Two)
= Constant, further minor point P₁Increase radius of curvature in direction
<The radius R of the long side of the composite arc shape 1₁
<Radius R of the straight portion of the oval 2_Two= ∞.

Under the above-described conditions, the curve drawn by the composite arc shape 1 exists outside the curve drawn by the elliptical shape 3 except for the common minor axis point P ₁ and major axis point P _{2, and} has an elliptical shape. It exists inside the curve drawn by shape 2 and is formed between the two. Therefore, if the horizontal cross-sectional shape of the molten metal transport container, for example, the ladle has a composite arc shape 1 that satisfies the above condition, the horizontal cross-sectional area can be increased as compared with the case of the elliptical shape 3. As a result, the amount of molten metal to be processed and transported per ladle charge can be increased, so that not only the unit consumption of utilities and the like can be reduced, but also productivity can be improved.

As described above, the ladle is transported by using an overhead crane. At this time, the crane hook is hung on a trunnion attached to the long side of the ladle. For this reason, in the case of a ladle having an oval shape 2, as shown in FIG. This causes the refractory lining the inner surface of the ladle to peel or fall off. On the other hand, in the case of the ladle having the composite arc shape 1, there is no linear portion, and the long side has a radius R.
_Since it is a circular arc having a ₁ , it is strong against deformation of the ladle iron, so that it is possible to reduce the adverse effect on the refractory inside of the ladle iron skin as compared with the case of the oval-shaped ladle 2. Will be possible.

[0015] As shown in FIG.
Diameter L₁= 3.0m, long diameter distance L _Two= 4.0m, height
= 4.2m and radius R of the long side portion₁= 3.0m,
Radius r of the minor axis₁= Composite arc shape 1 with 1.5m
Refractory 9 is lined on the inner surface of pot iron skin 8 and compound arc shape 1
Was prepared. In addition, 7 hangs ladle 10
Shows the trunnion attached to raise. This compound circle
Converter with arc shape 1 of ladle 10 with heat size of 250t / charge
Used at the factory. The tapping temperature from the converter is 1600 ° C and the pot
The use cycle time is 100 minutes. Composite circle of the present invention
The case where the ladle 10 having the arc shape 1 is used and the half of the comparative example
Diameter R₁= 1.5m, length L of straight section_Three= Ellipse of 1.0m
Distance L between ladle of shape 2 and elliptical focal point S_Four= 2.7m,
Long diameter point P _TwoElliptical radius R of_Three= 0.7m elliptical shape 3
Table 1 shows the use results when using a pot. Note that FIG.
, A dotted line indicates an elliptical shape 3 serving as a reference.

[0016]

[Table 1]

As shown in Table 1, according to the composite arc-shaped ladle of the present invention, since the deformation of the ladle iron can be reduced, the life of the refractory is longer than that of the oval-shaped ladle, and the ellipse is longer. Since the capacity of the molten steel can be increased as compared with the ladle having the shape, the melting cost can be reduced.

[0018]

As described above, according to the present invention, the horizontal cross-sectional shape of the transport container for accommodating and transporting the molten metal is a complex arc shape, so that the horizontal cross-sectional area of the transport container is elliptical. It is possible to increase, albeit slightly, compared to the case of using a ladle. As a result, the processing amount and the transport amount of the molten metal per ladle can be increased, so that the basic unit such as utility can be reduced, and the productivity of the molten metal can be improved. In addition, since it has an arc shape with no straight part on the long side like an elliptical ladle, it is more resistant to deformation of the ladle steel. Adverse effects on the refractory etc. on the inner surface of the pot can be reduced, and the life of the refractory can be extended.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a situation in which a horizontal sectional shape of a ladle having a composite arc shape of the present invention is determined.

FIG. 2 is a horizontal sectional view of a ladle having a composite arc shape according to the present invention.

FIG. 3 is an explanatory view showing a horizontal cross section of a ladle having an oval shape in a comparative example.

FIG. 4 is an explanatory view showing a horizontal section of a ladle having an elliptical shape according to a comparative example.

FIG. 5 is an explanatory diagram showing a relationship between an oval shape and an elliptical shape of a comparative example.

FIG. 6 is a front view showing a state in which the ladle is lifted.

FIG. 7 is a side view of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Composite arc shape 2 Oval shape 3 Oval shape 5 Crane sheave 6 Hook 7 Trunnion 8 Ladle iron 9 Refractory 10 Ladle

Claims (2)

[Claims] 1. A transport container for transporting molten metal, comprising:
The horizontal cross-sectional shape of the transport container, based on a predetermined elliptical shape, has a center point on a minor axis center line connecting the minor axis points and sharing the minor axis points, and is located outside the elliptical shape. While the long side arc is drawn with the inner surface side facing by the radius selected to have, the ellipse shares two major points and has a center point on the major axis connecting the major points, and the ellipse curve A short side arc is drawn with the inner surface side facing by a radius selected to be located on the outside, and the long side arc and the short side arc drawn opposite to each other are smoothly drawn through four joint points. A container for transporting molten metal, wherein the container has a composite arc shape combined into a curved line. 2. When the four joint points of the long side arc and the short side arc drawn opposite to each other are bent, the composite arc shape is corrected so that the joint points have a smooth curve. The container for transporting molten metal according to claim 1, wherein