Ladle

Abstract

To provide a ladle excellent in durability and easy to maintain.SOLUTION: A ladle 2 has: an iron skin 4 having an opening 4C at an upper end; a refractory layer 6 covering an inner surface 4E of the iron skin 4; a first band 12 extending circumferentially around the opening 4C to an outer surface 4F of the iron skin 4 and surrounding the iron skin 4; and a second band 14 extending circumferentially to an outer surface 12A of the first band 12 and surrounding the first band 12. It is preferable that the ladle 2 is further provided with presser hardware 10 located above the refractory layer 6 in the opening 4C. It is preferable that the first band 12 is welded to the iron skin 4 and the second band 14 is welded to the first band 12.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present specification discloses a ladle. [Background technology]

[0002] Ladles are used for transferring and processing molten steel. A ladle has a shell and refractory bricks that cover the inner surface of the shell. Some ladles have a metal fitting on the top of the refractory bricks to prevent the refractory bricks from falling off. An example of such a ladle is disclosed in Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 2-144255 Summary of the Invention [Problem to be solved by the invention]

[0004] Ladles are used to transport and process high-temperature molten steel. Because the molten steel is very hot, the shell and refractory bricks expand and contract repeatedly. This repeated expansion and contraction reduces the durability of the ladle. For this reason, ladles require regular maintenance.

[0005] It is the applicant's intention to provide a ladle which is highly durable and easy to maintain. [Means for solving the problem]

[0006] The ladle disclosed in this specification has a shell having an opening at an upper end, a refractory layer covering the inner surface of the shell, a first zone extending circumferentially on the outer surface of the shell around the opening and surrounding the shell, and a second zone extending circumferentially on the outer surface of the first zone and surrounding the first zone.

[0007] Preferably, the ladle further comprises a pressure plate located above the refractory layer.

[0008] Preferably, the first band is welded to the shell and the second band is welded to the first band.

[0009] Preferably, in the up-down direction, the first band surrounds an outer peripheral surface of the shell above a center thereof.

[0010] Preferably, the width W1 of the first zone is less than 1 / 2 the height H of the shell.

[0011] Preferably, in the up-down direction, the second zone surrounds an outer peripheral surface above a center of the first zone.

[0012] Preferably, the width W2 of the second zone is less than half the width W1 of the first zone. Effect of the Invention

[0013] Since this ladle is provided with the first and second bands, deformation of the shell is suppressed. This ladle is excellent in durability. This ladle allows for easy replacement of the first and second bands. This ladle is easy to maintain. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a cross-sectional view showing a ladle according to one embodiment. [Diagram 2] FIG. 2 is a cross-sectional view of a portion of the ladle of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, preferred embodiments will be described in detail with reference to the drawings as appropriate.

[0016] 1 shows a ladle 2. The ladle 2 has a shell 4, a refractory layer 6 as a sidewall lining, a refractory layer 8 as a bottom lining, a presser metal fitting 10, a first band 12, and a second band 14. The ladle 2 is open at the top. The ladle 2 has a gate 16 that penetrates the shell 4 and the refractory layer 8.

[0017] The shell 4 has a side wall 4A and a bottom 4B. The side wall 4A extends in the circumferential direction and forms a space inside. The lower end of the side wall 4A is closed by the bottom 4B. The shell 4 has an opening 4C at its upper end. The shell 4 has a through hole 4D in the bottom 4B. The shell 4 has an inner peripheral surface 4E, an outer peripheral surface 4F, and a bottom surface 4G. The material of this shell 4 is, for example, steel, but is not limited to this. The shape of this shell 4 is cylindrical with a bottom, but is not limited to this.

[0018] The refractory layer 6 covers the inner peripheral surface 4E of the shell 4. The refractory layer 6 has a lining refractory layer 6A, a middle lining refractory layer 6B, and an inner lining refractory layer 6C. The lining refractory layer 6A is located inside the side wall 4A. The middle lining refractory layer 6B is located inside the lining refractory layer 6A. The inner lining refractory layer 6C is located inside the middle lining refractory layer 6B.

[0019] The lining refractory layer 6A is formed by stacking a large number of refractory bricks 18A along the inner peripheral surface 4E of the steel shell 4. The middle lining refractory layer 6B is formed by stacking a large number of refractory bricks 18B along the inner peripheral surface of the lining refractory layer 6A. The lining refractory layer 6C is formed by stacking a large number of refractory bricks 18C along the inner peripheral surface of the middle lining refractory layer 6B.

[0020] The refractory layer 8 covers an upper surface of the bottom 4B of the shell 4. The refractory layer 8 is made of firebricks. The refractory layer 8 has through holes 8A.

[0021] The presser metal 10 is attached to a side wall 4A of the shell 4. The presser metal 10 protrudes inward in the radial direction of the shell 4 from the side wall 4A. The presser metal 10 is located on the refractory layer 6.

[0022] The first band 12 is located outside the opening 4C of the shell 4. The first band 12 extends circumferentially around the outer circumferential surface 4F of the shell 4. The first band 12 surrounds the side wall 4A. The first band 12 surrounds the outer circumferential surface 4F. The first band 12 has an outer circumferential surface 12A. The material of the first band 12 is, for example, steel, but is not limited thereto. The first band 12 is attached to the shell 4. The first band 12 is welded to the shell 4. Note that welding is an example of a method of attaching the first band 12, and is not limited thereto. For example, the first band 12 may be fitted to the shell 4.

[0023] The second band 14 is located outside the opening 4C of the shell 4. The second band 14 is located outside the first band 12. The second band 14 extends circumferentially on the outer circumferential surface 12A of the first band 12. The second band 14 surrounds the first band 12. The second band 14 surrounds the outer circumferential surface 12A of the first band 12. The material of the second band 14 is, for example, steel, but is not limited thereto. The second band 14 is attached to the first band 12. The second band 14 is welded to the first band 12. Note that welding is an example of a method of attaching the second band 14, and is not limited thereto. For example, the second band 14 may be fitted into the first band 12.

[0024] The double-headed arrow H in FIG. 2 represents the height of the shell 4. The height H is measured along the outer peripheral surface 4F of the shell 4 as the distance from the bottom to the top of the shell 4. The double-headed arrow W1 represents the width of the first band 12. The width W1 is measured along the outer peripheral surface 4F. The double-headed arrow W2 represents the width of the second band 14. The width W2 is measured along the outer peripheral surface 12A of the first band 12.

[0025] In this ladle 2, the width W1 of the first zone 12 is small relative to the height H of the shell 4. The width W2 of the second zone 14 is small relative to the width W1 of the first zone 12. For example, the ratio W1 / H of the width W1 to the height H is 1 / 4. The ratio W2 / W1 of the width W2 to the width W1 is 1 / 3.

[0026] High-temperature molten steel is poured into this ladle 2. The heat of the molten steel causes the refractory bricks 18A, 18B, and 18C shown in FIG. 1 to expand. The molten steel is discharged from the spout 16 of the ladle 2. As the molten steel is discharged, the expanded refractory bricks 18A, 18B, and 18C contract. In this manner, the refractory bricks 18A, 18B, and 18C repeatedly expand and contract. The expansion and contraction of the refractory bricks 18A, 18B, and 18C deforms the shell 4. In particular, the shell 4 is prone to large outward deformation in the vicinity of the opening 4C.

[0027] The outward deformation of the shell 4 creates gaps between the refractory bricks 18A. Similarly, the deformation creates gaps between the refractory bricks 18B and 18C. These gaps further impair the durability of the refractory bricks 18A, 18B, and 18C. These gaps also cause the shell 4 to deform further.

[0028] The ladle 2 includes a first band 12 that surrounds the shell 4 around the opening 4C. The ladle 2 further includes a second band 14 that surrounds the first band 12. The first band 12 and the second band 14 suppress outward deformation of the shell 4 in the vicinity of the opening 4C. As a result, the first band 12 and the second band 14 suppress the occurrence of gaps between the refractory bricks 18A, 18B, and 18C. The durability of the ladle 2 is improved.

[0029] The pressing metal 10 presses the refractory layer 6 downward from above. The pressing metal 10 prevents the refractory bricks 18A, 18B, and 18C from falling off. The pressing metal 10 contributes to improving the durability of the ladle 2.

[0030] On the other hand, as described above, the heat of the molten steel causes the refractory bricks 18A, 18B, and 18C to expand. This expansion pushes the presser metal 10 upward. The deformation of the presser metal 10 promotes the outward deformation of the shell 4. The first band 12 and the second band 14 suppress the outward deformation of the shell 4. As a result, the first band 12 and the second band 14 also suppress the deformation of the presser metal 10. The first band 12 and the second band 14 improve the durability of the ladle 2 equipped with the presser metal 10.

[0031] From the viewpoint of suppressing deformation of the shell 4 near the opening 4C, it is considered to thicken the side wall 4A of the shell 4. However, thickening the side wall 4A increases the mass of the ladle 2, which increases the manufacturing cost of the ladle 2. Furthermore, as a result of various prototypes, it has been confirmed that the deformation of the shell 4 can be sufficiently reduced by welding the first band 12 and the second band 14 to the shell 4. From the viewpoint of suppressing deformation of the shell 4, it is preferable that the first band 12 is welded to the shell 4, and the second band 14 is welded to the first band 12.

[0032] The first zone 12 having a small width W1 can be easily attached to and detached from the shell 4. The first zone 12 having a small width W1 improves the ease of maintenance of the ladle 2. In addition, even the first zone 12 having a small width W1 suppresses deformation of the shell 4 in the vicinity of the opening 4C.

[0033] From these viewpoints, the first band 12 preferably surrounds the outer peripheral surface 4F of the shell 4 from the upper end thereof in the vertical direction. Also, the first band 12 preferably surrounds the outer peripheral surface 4F above the center of the shell 4 in the vertical direction. More preferably, the first band 12 surrounds not more than ⅓ of the outer peripheral surface 4F of the shell 4 from the upper end thereof in the vertical direction, and particularly preferably surrounds not more than ¼ of the outer peripheral surface 4F of the shell 4 from the upper end thereof.

[0034] From the same viewpoint, the ratio W1 / H of the width W1 of the first zone 12 to the height H of the shell 4 is preferably less than 1 / 2, more preferably 1 / 3 or less, and particularly preferably 1 / 4 or less.

[0035] Furthermore, the second band 14 having a small width W2 can be easily attached to and detached from the first band 12. The second band 14 having a small width W2 improves the ease of maintenance of the ladle 2. Furthermore, even the second band 14 having a small width W2 suppresses deformation of the shell 4 in the vicinity of the opening 4C.

[0036] From these viewpoints, the second band 14 preferably surrounds the outer peripheral surface 12A of the first band 12 from the upper end in the vertical direction. Also, the second band 14 preferably surrounds the outer peripheral surface 12A above the center of the first band 12 in the vertical direction. Further, the second band 14 preferably surrounds ⅓ or less of the outer peripheral surface 12A from the upper end of the first band 12 in the vertical direction, and particularly preferably surrounds ⅓ or less of the outer peripheral surface 12A from the upper end of the first band 12.

[0037] From a similar viewpoint, the ratio W2 / W1 of the width W2 of the second zone 14 to the width W1 of the first zone 12 is preferably less than 1 / 2, more preferably 1 / 3 or less, and particularly preferably 1 / 4 or less. [Explanation of symbols]

[0038] 2...Ladle 4...Ironhide 4C...Aperture 4E...Inner surface 4F...Outer surface 6. Sidewall lining (refractory layer) 10. Clamping hardware 12. First Zone 14. Second Zone

Claims

1. A shell having an opening at the top; a refractory layer covering an inner peripheral surface of the shell; a first zone extending circumferentially around the outer circumferential surface of the shell around the opening and surrounding the shell; And, A second zone extending circumferentially around the outer periphery of the first zone and surrounding the first zone. The ladle has a

2. 2. The ladle of claim 1, further comprising a pressure plate located at said opening and above said refractory layer.

3. the first band is welded to the shell; 3. The ladle of claim 1 or 2, wherein the second band is welded to the first band.

4. 3. The ladle according to claim 1, wherein the first zone surrounds an outer peripheral surface of the shell above a center thereof in a vertical direction.

5. 3. The ladle according to claim 1 or 2, wherein the width W1 of the first zone is less than 1 / 2 of the height H of the shell.

6. 3. The ladle according to claim 1 or 2, wherein the second zone surrounds an outer peripheral surface of the first zone above a center thereof in the vertical direction.

7. 3. The ladle according to claim 1 or 2, wherein the width W2 of the second zone is less than 1 / 2 the width W1 of the first zone.

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