JP7412762B2 - pouring ladle - Google Patents

Description

Article 30, Paragraph 2 of the Patent Act applies ▲1▼ Installation start date April 9, 2020 ▲2▼ Installation location Toyota Motor Corporation Tahara Factory (3-1 Midorigahama, Tahara City, Aichi Prefecture)

The present invention relates to a molten metal pouring ladle used for pouring molten metal into a sleeve of a die-casting machine.

A pouring ladle has traditionally been used to pour metal into the sleeve of a die-casting machine. A pouring ladle is a type of bucket used to draw high-temperature molten metal made of alloy from a molten metal insulating furnace and pour it into a sleeve. The molten metal poured into the sleeve is pressurized and extruded by a plunger, filling the mold in front of the sleeve, and then the mold is released to obtain a die-cast product in a predetermined shape. Patent Document 1 and Patent Document 2 are cited as prior art of such die casting machines and pouring ladle.

Japanese Patent Application Publication No. 2011-125920 Japanese Patent Application Publication No. 2015-100836

When pouring molten metal into the sleeve, for example, as shown in FIGS. 7 and 8 of Patent Document 2, the pouring hole of the molten metal pouring ladle is placed near the molten metal receiving port opened at the top of the sleeve, and the molten metal pouring ladle is tilted and poured. Make the molten metal fall from the sprue. However, the sequence of movements of the pouring ladle that draws and pours the molten metal into the sleeve is automatically controlled so that the molten metal falls into the sleeve in exactly the same way every time. In other words, the falling molten metal concentrates at one point on the inner circumference of the sleeve, and only that part is constantly exposed to the hot molten metal. As a result, the sleeve deteriorates with repeated use, and the deteriorated portion must be repaired, or if repaired too often, the sleeve must eventually be replaced.
Therefore, there was a need for a technology that would prevent the sleeve from being deteriorated by the molten metal when pouring molten metal into the pouring ladle.

In order to achieve the above object, as means 1, a bottomed storage part surrounded by a peripheral wall for storing molten metal, and a pouring part formed above the storage part and protruding forward. The molten metal stored in the storage section is rotated around the rotation axis and tilted to allow the molten metal stored in the storage section to pass through the pouring section and from the pouring port at the tip of the pouring section to the receiving part of the sleeve of the die-casting machine. In the pouring ladle for pouring metal into a sprue, the pouring part is provided with a first wall surface and a second wall surface arranged such that the direction intersecting the axial direction of the rotation shaft is the surface direction. A passage is formed with an open upper part, and the passage has a V-shaped valley shape by joining the lower end portions of the first wall surface and the second wall surface, and is disposed on the front side of the sleeve. The first wall surface is configured such that an extension direction of a tangent to a surface of the introduction portion connected to the first wall surface is directed toward the second wall surface.
This allows the main flow of the molten metal flowing down from the storage part to flow along the surface of the introduction part that connects to the first wall surface when the pouring ladle is tilted to pour the molten metal into the sleeve's receiving port. The liquid can be guided by the surface curve of the introduction portion to flow across the passage in the direction of the second wall surface, which is the direction of the curve extension. In other words, most of the molten metal that flows down from the storage section does not flow along the first wall surface (this does not mean that it does not flow at all, but rather flows along a V-shape in the initial stage of flow when the momentum is weak). On the other hand, since the surface of the introduction portion connected to the second wall surface does not have such a shape (it is oriented in the direction along the second wall surface), the flow will flow along the second wall surface. The direction along the second wall is the pouring spout. The main flow of the molten metal will be concentrated in the direction of the second wall, and due to the pressure at that time, the molten metal that has gathered in the direction of the second wall will spread in the height direction of the second wall and fall in a band from the pouring port. becomes.
As the molten metal spreads in a band shape in this way, the pressure of the high-temperature molten metal is distributed in a line rather than in one point and collides with the inner peripheral surface of the sleeve, which suppresses damage to the sleeve and prevents deterioration. Even if repairs are necessary, the number of repairs can be reduced and the timing of repairs can be delayed. Furthermore, if the sleeve needs to be replaced, the replacement timing can be delayed.

Although the angle between the first wall surface and the second wall surface in the "V-shaped valley" is not limited, it is preferably configured to have a narrow angle to prevent the molten metal from overflowing.
The "introduction surface" is the inner peripheral portion of the pouring ladle that gradually becomes the first wall surface. The surface of the introduction portion is, for example, a surface where a part of the inner surface of the peripheral wall of the storage portion is connected to the first wall surface near the pouring portion. In that case, the surface of the introduction part is not necessarily clearly distinguishable from the surrounding surfaces at first glance because it has a certain shape that connects the peripheral wall of the storage section to the first wall surface. However, the shape may be such that it can be distinguished by forming a clear bent portion or the like. Further, for example, there may be an introduction portion in the outflow path that does not correspond to either the storage portion or the pouring portion, between the storage portion and the pouring portion.
In the "extending direction of the surface of the introduction portion", the surface may be an outwardly convex curved surface or a flat surface, and it is sufficient that the extending direction of the surface is oriented toward the second wall surface direction. If it is a curved surface, it will be the extension direction of the curve, and if it is a flat surface, it will be the straight direction along the surface.

Further, as means 2, the pouring portion is gradually narrowed toward the pouring port.
If the pouring section is made narrow from the beginning, the curvature of the inner surface of the first wall and the second wall will suddenly increase from the introduction part, and the molten metal will concentrate all at once and enter the pouring section. There is a possibility that the width will overflow, but by configuring it so that it is not the same width but gradually narrows, the molten metal will not overflow in the middle of the pouring area, and , the curve becomes gentler, making it easier to guide the molten metal.
Further, as means 3, the first wall surface and the second wall surface both have a curved shape that is convex inward along the pouring hole, and the curvature of the curve of the first wall surface is the same as the second wall surface. The curvature is now larger than the curvature of the wall surface.
For the first wall surface, the extension direction of the tangent to the surface of the introduction section is directed toward the second wall surface, so if the curvature of the curve of the first wall surface is small, the width of the passage in the pouring section will also be narrow. . Therefore, by forming the curvature of the curve of the first wall surface to be larger than the curvature of the curve of the second wall surface, the first wall surface can be bent greatly in the direction of extension, and the width of the passage in the pouring section is can be secured sufficiently.

Moreover, as means 4, the pouring part is arranged offset toward the first wall surface with respect to the midline of the storage part which is perpendicular to the rotation axis.
In other words, the spout is oriented toward the sprue inlet of the sleeve of the die-casting machine. This makes it easier for the molten metal to be poured into the inlet, and also makes it easier for the molten metal to flow forward of the sleeve after pouring.
Further, as means 5, the pouring port of the pouring part is configured such that the second wall surface protrudes more forward than the first wall surface.
This is because it is easier to guide the molten metal if the passage on the second wall side is longer, considering the position of the pouring ladle relative to the sleeve's pouring port and the case where the pouring portion is offset as described above.
Further, as means 6, the surface of the introduction portion is connected to the first wall surface by a continuous curved surface.
A "continuous curved surface" is a curved surface that has no steps or curved parts in the middle, and is composed of curves that gradually decrease or increase even if the curvature is not the same. This is because a continuous curved surface makes it difficult for the molten metal to bubble or splash in the ladle during pouring, contributing to smooth pouring work.
Further, as means 7, the angle on the pouring port side formed by the intersection of the second wall surface and the direction of the curved shape on the surface of the introduction portion to the pouring portion is made to be an obtuse angle.
In other words, the molten metal flowing from the first wall across the passage toward the second wall does not hit the second wall from the front, but from an oblique direction toward the pouring port. This makes it easier for the molten metal flowing along the walls of the passageway to join together, making it difficult for the molten metal to splash or overflow within the passageway, and contributing to the molten metal spreading out in a clean strip.
The inventions of means 1 to 7 described above can be combined arbitrarily. Any component of each of the inventions of means 1 to 7 may be extracted and combined with other components.

According to the pouring ladle of the present invention, the molten metal spreads in a band shape during pouring, and the pressure of the high-temperature molten metal is distributed not at one point but in a line and collides with the inner peripheral surface of the sleeve. Damage to the sleeve is suppressed, and even if repairs are required due to deterioration, the number of repairs can be reduced and the timing of repairs can be delayed. Furthermore, if the sleeve needs to be replaced, the replacement timing can be delayed.

FIG. 1 is a perspective view of a pouring ladle according to an embodiment of the present invention. FIG. 3 is a plan view of a pouring ladle of the same embodiment. (a) is a side view of the pouring ladle of the same embodiment, and (b) is a sectional view taken along the line AA in FIG. 2. FIG. 3 is a front view of the pouring ladle of the same embodiment. (a) is a sectional view taken along line BB in FIG. 4, (b) is a sectional view taken along line CC in FIG. 4, and (c) is a sectional view taken along line DD in FIG. 4. Explanatory drawing explaining how to use the pouring ladle of the same embodiment. FIG. 2 is an explanatory diagram showing a state in which molten metal is dropped in a band shape from a pouring ladle into a sleeve of a die-casting machine according to the same embodiment. In the same embodiment, (a) is an explanatory diagram illustrating the state of the molten metal falling from the pouring ladle at the initial stage of tilting and (b) after the middle stage of tilting.

EMBODIMENT OF THE INVENTION Hereinafter, the pouring ladle 1 which is one embodiment of this invention is demonstrated based on drawing.
The pouring ladle 1 is an integrally cast product made of an alloy having a higher melting point than the molten metal for die casting. As shown in FIG. 1, the pouring ladle 1 includes a storage section 2 and a pouring section 3. First, the outline of the pouring ladle 1 will be explained. Note that, in the following description, the side of the pouring part 3 with respect to the storage part 2 will be described as the front side.
The storage portion 2 has a crucible-shaped appearance that appears as an outer diameter of an ellipsoid in cross section, which is longer in the front-rear direction than in the left-right direction. As shown in FIGS. 1, 2, 5(a) to 5(c), etc., the bottom region 2a of the storage section 2 has a hemispherical shape that is long in the front and back and is convex downward. The peripheral wall 2b is configured to stand up with a slight inclination toward the outside. The upper part of the storage part 2 is not closed and forms an opening 2c for pumping the molten metal. The front side of the storage section 2 is configured to protrude forward toward the top and is connected to the pouring section 3.

The upper front portion of the storage portion 2 is configured to protrude as if gradually elongated toward the front, and the protruded front portion serves as the pouring portion 3. The inner surface of the pouring portion 3 is a passage 6 consisting of a first wall surface 4 and a second wall surface 5. As shown in FIGS. 1 and 4, the passage 6 has a V-shaped valley shape in which the lower ends of the first wall surface 4 and the second wall surface 5 are obliquely joined. The angle between the first wall surface 4 and the second wall surface 5 is configured to be a narrow angle (approximately 65 degrees in this embodiment). The cross-sectional direction of the passage 6 has a V-shaped valley shape, so the bottom part is bent discontinuously, but the passage 6 is a storage part in the longitudinal direction, as shown in FIGS. 2 and 3(b). 2 (that is, the inner peripheral surface of the peripheral wall 2b) as a smoothly curved surface with no step. The front end of the passage 6 is a pouring spout 7.
Bracket parts 8 each having an L-shaped cross section are formed integrally with the pouring part 3 at left and right positions on the outer surface of the pouring part 3, respectively. A cylindrical bearing portion 9 is formed integrally with the bracket portion 8 . The axial direction R passing through the cylinder center of the bearing part 9 is the same in the left and right bearing parts 9, and the pouring ladle 1 swings around the bearing part 9 by a rotating shaft (not shown) fixed to this bearing part 9. It will be pivoted if possible. The axial center position exactly coincides with the top position of the tip of the first wall surface 4 of the pouring part 3.
A cutout 10 for draining hot water is formed at the rear of the storage section 2 near the top. Since the molten metal stored in the reservoir 2 is drained by the notch 10, the shelf position of the notch 10, which is one step lower than the upper end of the opening 2c, becomes the demarcation line position.

Next, the shape of the vicinity of the pouring portion 3 will be explained in more detail.
As shown in FIGS. 2 and 3(a), the pouring section 3 is arranged in the right direction in the figure, with the passage 6 facing the first wall surface 4 with respect to the center line O of the storage section 2, which is orthogonal to the axial direction R. It is offset from the centerline O so that it points slightly toward the center line O. When viewed from the passageway 6, the longitudinal direction of the bottom of the V shape, where the lower ends of the first wall surface 4 and the second wall surface 5, which are the centerline of the passageway 6 are joined, is directed to the right by an angle α from the centerline O in FIG. (in this embodiment, the angle α is approximately 5 degrees). The pouring spout 7 at the tip of the passage 6 has the second wall surface 5 side extended further forward than the first wall surface 4. Furthermore, because the pouring portion 3 is offset, the end of the pouring port 7 is not parallel to the axial direction R but is arranged inclined toward the first wall surface 4 side. Further, as shown in FIG. 3, the second wall surface 5 side is configured to be slightly taller (height in the vertical direction) than the first wall surface 4. Further, the width of the passage 6 is wider on the side of the peripheral wall 2b than on the pouring port 7 because it is smoothly connected to the inner circumferential surface of the peripheral wall 2b on the side of the storage section 2.

Next, the surface shapes of the introduction surfaces 11A and 11B that connect the peripheral wall 2b of the storage section 2 to the first wall surface 4 and the second wall surface 5 will be explained. In this embodiment, the introduction surfaces 11A and 11B are left and right inner circumferential surface portions that gradually move toward the storage section 2 near the front upper part of the storage section 2. Specifically, the inner circumferential surfaces around the area indicated by broken lines in FIGS. 3(a) and 3(a) become the introduction surfaces 11A and 11B. Note that the introduction surfaces 11A and 11B cannot be strictly divided, and the area surrounded by the broken line in FIG. 3(a) indicates the approximate position of the introduction surfaces 11A and 11B. As shown in FIGS. 2, 5(a) to 5(c), etc., the introduction surfaces 11A and 11B are basically part of the inner peripheral surface of the peripheral wall 2b and are smooth curved surfaces. It is connected to the wall surface 5 of 2. Further, the front portion of the storage portion 2 connected to the V-shaped bottom of the passage 6 is defined as an introduction surface 11C. The center of the introduction surface 11C is gently concave in a V-shape as it approaches the passage 6, and is smoothly connected to the V-shaped bottom of the passage 6. The introduction surface 11A and the introduction surface 11B are each smoothly connected to the introduction surface 11C, and the boundaries of the connection areas are not clear.

The introduction surfaces 11A, 11B, and 11C each have different curves, and the area connecting the pouring part 3 and the storage part 2 is not uniform. For example, as shown in FIG. 3(b), the side surface in the vicinity of the vertical introduction surface 11C extending from the inner circumferential surface of the peripheral wall 2b of the storage section 2 to the passage 6 from the bottom region 2a toward the pouring port 7 is generally smooth and has a gentle inner surface. It consists of a convex curve. In the vertical direction, the introduction surfaces 11A and 11B are similarly smooth.
On the other hand, as shown in FIGS. 2 and 5(a) and 5(b), in the horizontal circumferential direction perpendicular to the vertical direction, the shapes of the introduction surfaces 11A, 11B, and 11C are not the same, but have surface shapes with different characteristics. I can see that it is being done.
The introduction surface 11A, which is the surface of the introduction portion, is once bent greatly inward at the P position to form an inwardly concave shape and is connected to the first wall surface 4. That is, on the introduction surface 11A side, the angle is changed significantly at position P, which is the inflection point. Then, from position P onward, it is connected to the first wall surface 4 by a curve that becomes gradually convex (or a plane as shown in FIG. 5(b)) and is smooth and gradually becomes convex. There is.
On the other hand, the introduction surface 11B does not have an inflection point where the curve shape greatly changes as at the P position, and is almost straight (slightly convex inward) and smoothly connected to the second wall surface 5. Therefore, as shown in FIG. 2, the tangent T1, which is a line segment touching the introduction surface 11A in plan view, is directed toward the second wall surface 5 and not toward the pouring port 7 , and the tangent T2 on the introduction surface 11B side is the line segment that is in contact with the introduction surface 11A. 6 , it runs generally along the second wall surface 5 toward the spout 7 .
In this embodiment, the angle β between the tangent T1 and the second wall surface 5 is an obtuse angle (approximately 140 degrees in this embodiment). As mentioned above, the angle between the first wall surface 4 and the second wall surface 5 of the passage 6 is about 65 degrees, but as shown in FIGS. 2 and 5(a) to 5(c), Near the boundary, they are loosely connected at an even greater angle.

Next, the flow of molten metal when pouring into the receiving port 22 of the sleeve 21 of a die-casting machine using the pouring ladle 1 configured as described above will be described. Note that the pouring ladle 1 is used in a known automatic lubricating device (not shown), which automatically pumps up the molten metal from the molten metal insulating furnace, moves it, and repeats pouring into the sleeve 21. Explanation regarding movement will be omitted. The following description will focus on an action in which the pouring ladle 1 is placed near the sleeve 21 and the pouring ladle 1 is tilted to pour the metal into the receiving port 22. A rotation shaft for swinging the pouring ladle 1 is also omitted from illustration.
The sleeve 21 used in this embodiment is a cylindrical hollow body made of an alloy whose melting point is higher than that of the molten metal. In this embodiment, the inlet port 22 is a square opening and is formed on the upper surface of the rear side of the sleeve 21 . A mold (not shown) is arranged in front of the sleeve 21, and a plunger 23 is arranged in the rear. After pouring the molten metal into the sleeve 21, the plunger 23 advances at a predetermined timing to fill the mold with the molten metal in the sleeve 21.

As shown in FIG. 6, in this embodiment, the pouring ladle 1 is disposed diagonally behind the pouring port 22 of the sleeve 21 as a pouring position. Specifically, the positional relationship in plan view is such that the center line O forms an angle of 45 degrees with respect to the axial direction L of the sleeve 21. However, since the passage 6 in the pouring portion 3 is inclined in the forward direction of the sleeve 21 by an angle α, the flowing molten metal reaches a position slightly forward of the position reached by the extension of the center line O.
Now, when the pouring ladle 1 is tilted about the rotation axis so that the pouring port 7 is lowered, the molten metal flows down into the sleeve 21 as follows. Hereinafter, in the description of FIGS. 8(a) and 8(b), the molten metal M will be used.
(1) At the initial stage of tilting, the flow velocity and flow rate are low, and the molten metal M flowing from the storage section 2 without passing through the introduction surface 11A or the introduction surface 11B flows from the introduction surface 11C to the passage 6 as shown in FIG. 8(a). The water will flow down along the bottom of the V-shape. At this stage, the molten metal M falls into the sleeve 21 without spreading into a band.
(2) After the middle stage of tilting, the tilt increases and the flow rate and flow rate increase, so the molten metal gains momentum. Therefore, the molten metal M passes through the introduction surface 11A and the introduction surface 11B and reaches the passage 6.
As the molten metal M flowing along the introduction surface 11A increases in force, it is gradually guided by the curve of the introduction surface 11A as shown in FIG. 8(b) and crosses the passage 6 obliquely to the second wall surface in the direction of the curve extension line. The water flows in five directions, and at a certain stage it no longer flows along the first wall surface 4 at all. On the other hand, the molten metal M flowing along the introduction surface 11B flows almost along the second wall surface 5. The molten metal M flowing down the introduction surface 11C is also pushed by the molten metal M from the direction of the introduction surface 11A, and flows together in the direction of the second wall surface 5. Therefore, the molten metal M will concentrate in the direction of the second wall surface 5, but at this time, the molten metal M will spread in the width direction (vertical direction) of the second wall surface 5, as shown by the broken line in FIG. The molten metal M spreads in a band shape in the width direction of the second wall surface 5 and falls into the sleeve 21.
(3) After the final stage of tilting, the amount of the molten metal M flowing down decreases, so the falling force of the molten metal M decreases, and it no longer passes through the introduction surface 11A or the introduction surface 11B. Therefore, the molten metal M flows down from the introduction surface 11C along the bottom of the V-shape again as shown in (1).

By configuring as described above, the pouring ladle 1 of the embodiment has the following effects.
(1) Since the molten metal M falling into the sleeve 21 has a wide band shape, the falling area is dispersed and deterioration of the sleeve 21 is suppressed, and even if repairs are necessary due to deterioration, the number of repairs can be reduced. This can also delay the timing of repairs. Furthermore, if it is necessary to replace the sleeve 21, the replacement timing can also be delayed.
(2) Since the pouring portion 3 is inclined toward the front of the sleeve 21, the molten metal M can be guided further forward.
(3) A conventional general pouring ladle has a U-shaped cross section. In such a conventional U-shaped pouring ladle, when pouring metal vigorously, the waves of molten metal that rush from both sides in the passage collide near the center and are combined, resulting in large waves. Large waves cause molten metal to spill. Therefore, it was necessary to pour hot water while restricting it to avoid large waves. On the other hand, in the pouring ladle 1 of the embodiment, the cross-sectional shape of the passage 6 of the pouring portion 3 is V-shaped, and the molten metal M is concentrated in the direction of the second wall surface 5. Therefore, even if you pour the metal vigorously, there will be no large waves unlike the conventional U-shaped pouring ladle, and as a result, the pouring ladle 1 of the embodiment is similar to the conventional U-shaped pouring ladle. This means that the metal can be poured into the sleeve 21 more quickly than in the previous example.

The embodiments described above are merely described as specific embodiments for illustrating the principles and concepts of the present invention. That is, the present invention is not limited to the above embodiments. The present invention can also be embodied in the following modified aspects, for example.
- In the above, both the pouring part 3 and the storage part 2 are open at the top, but the upper part of the storage part may be surrounded, for example.
- The introduction surfaces 11A and 11B are not part of the storage section 2, but are formed in the outflow path between the storage section 2 and the pouring section 3, and the introduction surfaces 11A and 11B are provided in the outflow path. good. That is, the introduction part is not necessarily part of the reservoir. For example, if the pouring part 3 is provided at the tip of a long crane-necked part extending from the storage part 2, the position will be higher than the pouring port 7 when the molten metal is pumped up from the molten metal insulating furnace. This is because it cannot be called a department.
- The above position and mounting shape of the bearing portion 9 are merely examples.
- Although the pouring part 3 was arranged tilted toward the sleeve 21, it does not necessarily have to be tilted. In addition, although the first wall surface 4 and the second wall surface 5 constituting the inner surface of the passage 6 were linear, for example, these surfaces may be gradually curved (that is, the first wall surface 4 may be convex outward). , the second wall surface 5 may be configured to be oriented toward the sleeve 21 (so that the second wall surface 5 is concave outward).

The present invention is not limited to the configuration described in the embodiments described above. The components of each of the embodiments and modifications described above may be arbitrarily selected and combined. Also, any component of each embodiment or modification, any component described in the means for solving the invention, or a component that embodies any component described in the means for solving the invention. It may be configured in any combination. The applicant intends to obtain rights to these matters through amendments to the application or divisional applications.
In addition, the applicant intends to obtain rights to the entire design or partial design by filing a conversion application to a design application. Although the drawing depicts the entire device using solid lines, the drawing includes not only the overall design but also the partial design claimed for some parts of the device. For example, it is a drawing that not only includes some members of the device as a partial design, but also includes some parts of the device as a partial design regardless of the members. The part of the device may be a part of the device or a part of the device.

DESCRIPTION OF SYMBOLS 1...Pouring ladle, 2...Storage part, 3...Pouring part, 4...First wall surface, 5...Second wall surface, 6...Passway, 11A...Introduction surface which is the surface of the introduction part,
21... Sleeve, 22... Inlet, 55... Cooling pipe forming part of the cooling means.

Claims (7)

It has a bottomed storage part surrounded by a peripheral wall for storing molten metal, and a pouring part formed above the storage part and protruding forward, and rotates around a rotation axis. In the pouring ladle, the molten metal stored in the storage part is poured into the molten metal receiving port of the sleeve of the die-casting machine from the pouring port at the tip of the pouring part via the pouring part by tilting.
In the pouring part, a passage whose upper part is open is formed by a first wall surface and a second wall surface arranged such that a direction intersecting the axial direction of the rotation shaft is a surface direction. , the passage has a V-shaped valley shape with lower end portions of the first wall surface and the second wall surface being joined;
an introduction surface disposed at a midway position where surfaces are connected from the inner circumferential surface of the peripheral wall to the inner circumferential surfaces of the first wall surface and the second wall surface;
The first wall surface disposed on the front side of the sleeve has an extension direction of a tangent in a plan view of the introduction surface connected to the first wall surface directed toward the second wall surface. Features a pouring ladle. The pouring ladle according to claim 1, wherein the pouring portion gradually narrows toward the pouring port. The first wall surface and the second wall surface in a plan view both have a curved shape that is convex inward along the spout, and the curvature of the curve of the first wall surface is equal to the curvature of the curve of the second wall surface. 3. The pouring ladle according to claim 1, wherein the curvature of the pouring ladle is larger than the curvature of the curve. According to any one of claims 1 to 3, the pouring portion is arranged offset toward the first wall surface with respect to a center line of the storage portion that is perpendicular to the rotation axis. pouring ladle. Molten pouring according to any one of claims 1 to 4, wherein the pouring port of the pouring part is configured such that the second wall surface protrudes more forward than the first wall surface. Ladle. The pouring ladle according to any one of claims 1 to 5, wherein the introduction surface is connected to the first wall surface by a continuous curved surface. 10. An angle on the pouring port side formed by the intersection of a tangent to the curved shape of the introduction surface to the pouring part and the second wall surface in a plan view is an obtuse angle. 6. The pouring ladle according to any one of 6.

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