Steel ladle bottom structure

Abstract

The utility model discloses a ladle bottom structure of a steel ladle, which comprises a permanent castable layer positioned at the bottom of the steel ladle, a nozzle brick cup positioned above the permanent castable layer, an air brick, an impact brick and a working castable layer filled around the nozzle brick cup, the air brick and the impact brick, the upper surface of the impact brick is the highest point of the ladle bottom, and the working castable layer is distributed in a step shape from the periphery of the impact brick to the periphery of the nozzle seating brick.

Description

Technical Field

[0001] The utility model relates to a ladle, and more particularly to a ladle bottom structure. Background Art

[0002] The existing ladle is at the bottom of the ladle, and the top surface of the nozzle brick and impact brick are on the same plane as the casting material layer. The molten steel is poured from the converter into the ladle, with a height difference of 7-8 meters. The refractory material at the falling point is washed by the 1650℃ high-temperature molten steel at a height of nearly 7-8 meters, and the degree of melting loss is significantly higher than other positions at the bottom of the ladle, thus forming a pit. When pouring molten steel, a large amount of molten steel will accumulate in the pit area and cannot flow out from the ladle nozzle. Each time the steel is poured, 3-5 tons of molten steel will be accumulated and wasted. Utility Model Content

[0003] In order to overcome the above-mentioned defects, the utility model provides a ladle bottom structure which can allow as much molten steel as possible to flow out from the ladle water inlet.

[0004] To achieve the above-mentioned purpose, the utility model provides a ladle bottom structure, which includes a permanent castable layer located at the bottom of the ladle, a nozzle seat brick, a breathable brick, an impact brick located above the permanent castable layer, and a working castable layer filled around the nozzle seat brick, the breathable brick and the impact brick, characterized in that the upper surface of the nozzle seat brick is the lowest point of the ladle bottom, the upper surface of the impact brick is the highest point of the ladle bottom, and the working castable layer is distributed in a step-like manner from the periphery of the impact brick to the periphery of the nozzle seat brick.

[0005] The further technical features of the utility model are:

[0006] The working casting material layer is provided with two steps and three height planes from the periphery of the impact brick to the periphery of the nozzle seat brick. The first height plane is in the annular area between the impact brick and the ladle wall, and its height is flush with the upper surface of the impact brick; the third height plane is trapezoidal around the nozzle seat brick, and the third height plane is higher than the height of one step on the upper surface of the nozzle seat brick; a second height plane is provided between the third height plane and the first height plane, and the second height plane is 10-30mm lower than the upper surface of the air permeable brick.

[0007] The height of each step is 30-50 mm.

[0008] A confluence trough is arranged on the second height plane, and the bottom of the confluence trough is sloped. The slope of the bottom of the confluence trough relative to the bottom of the ladle is 3-10 degrees, and the bottom of the slope is at the same height as the third height plane.

[0009] The inclination gradient of the confluence trough is 3 degrees.

[0010] The inclination gradient of the confluence trough is 5 degrees.

[0011] The inclination gradient of the confluence trough is 10 degrees.

[0012] The beneficial effects of the utility model are:

[0013] Since the upper surface of the nozzle seat brick in the utility model is the lowest point of the ladle bottom, and the upper surface of the impact brick is the highest point of the ladle bottom, the working castable layer is distributed in a step-like manner from the periphery of the impact brick to the periphery of the nozzle seat brick. In this way, it is not easy to form a pit at the steel landing point when pouring steel, which effectively reduces the retention of molten steel and improves the molten steel recovery rate. In addition, the consumption of the working layer castable is lower than that of the existing ladle. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a top view of the structure according to a specific embodiment of the utility model;

[0015] Figure 2 yes Figure 1 Section view along the AA direction. DETAILED DESCRIPTION

[0016] The utility model will be further described in detail below with reference to the accompanying drawings.

[0017] like Figure 1 and Figure 2 The bottom structure of a steel ladle shown in the figure comprises a permanent castable layer 1 located at the bottom of the steel ladle, a nozzle seat brick 2, a gas brick 3, an impact brick 4 located above the permanent castable layer, and a working castable layer 5 filled around the nozzle seat brick 2, the gas brick 3 and the impact brick 4, characterized in that the upper surface of the nozzle seat brick is the lowest point of the bottom, the upper surface of the impact brick is the highest point of the bottom, and the working castable layer 5 is distributed in a step-like manner from the periphery of the impact brick to the periphery of the nozzle seat brick. In this embodiment, the working castable layer 5 is provided with two steps and three height planes from the periphery of the impact brick 4 to the periphery of the nozzle seat brick 2, the first height plane 51 is in the annular area between the impact brick 4 and the ladle wall, and the height is flush with the upper surface of the impact brick 4; the third height plane 53 is trapezoidal around the nozzle seat brick, and the third height plane 53 is higher than the height of one step on the upper surface of the nozzle seat brick; a second height plane 52 is provided between the third height plane 53 and the first height plane 51, and the second height plane 52 is 10 mm lower than the upper surface of the gas brick. In this embodiment, the height of each step is 30 mm. In addition, in this embodiment, a confluence groove 6 is provided on the second height plane 52, and the bottom of the confluence groove is sloped, and the slope of the bottom of the confluence groove 6 relative to the bottom of the ladle is 5 degrees, and the bottom of the slope is at the same height as the third height plane. The setting of the confluence groove is more conducive to the flow of molten steel to the nozzle seat brick, and reduces the probability of pit formation.

[0018] In practical applications, the second height plane can also be set to 20 mm or 30 mm lower than the upper surface of the air brick, and the slope of the bottom of the confluence trough 6 relative to the bottom of the ladle can also be set to 3 degrees or 10 degrees; the working castable layer 5 can also be set with three steps or 4 steps or even more from the periphery of the impact brick 4 to the periphery of the nozzle seat brick 2; the height of each step can also be set to 40 mm or 50 mm.

[0019] Since the upper surface of the nozzle seat brick in the utility model is the lowest point of the ladle bottom, and the upper surface of the impact brick 4 is the highest point of the ladle bottom, the working castable layer 5 is distributed in a step-like manner from the periphery of the impact brick to the periphery of the nozzle seat brick. In this way, it is not easy to form a pit at the steel landing point when pouring steel, which effectively reduces the retention of molten steel and improves the molten steel recovery rate. In addition, the consumption of the working layer castable is lower than that of the existing ladle.

[0020] The technical content and technical features of the utility model have been disclosed above, but it can be understood that under the creative idea of ​​the utility model, those skilled in the art can make various changes and improvements to the above structure, including the combination of technical features disclosed or claimed separately here, and other combinations that obviously include these features. These deformations and / or combinations all fall within the technical field involved in the utility model and fall within the protection scope of the claims of the utility model.

Claims

1. A ladle bottom structure, comprising a permanent castable layer located at the bottom of the ladle, a nozzle seat brick, a gas-permeable brick, an impact brick located above the permanent castable layer, and a working castable layer filled around the nozzle seat brick, the gas-permeable brick and the impact brick, characterized in that: The upper surface of the nozzle seat brick is the lowest point of the ladle bottom, and the upper surface of the impact brick is the highest point of the ladle bottom. The working castable layer is distributed in a step-like manner from the periphery of the impact brick to the periphery of the nozzle seat brick. The working castable layer is provided with two steps and three height planes from the periphery of the impact brick to the periphery of the nozzle seat brick. The first height plane is in the annular area between the impact brick and the ladle wall, and its height is flush with the upper surface of the impact brick; the third height plane is trapezoidal around the nozzle seat brick, and the third height plane is higher than the height of one step on the upper surface of the nozzle seat brick; a second height plane is provided between the third height plane and the first height plane, and the second height plane is 10-30mm lower than the upper surface of the air permeable brick.

2. The ladle bottom structure according to claim 1, characterized in that: The height of each step is 30-50 mm.

3. The ladle bottom structure according to claim 1 or claim 2, characterized in that: A confluence trough is arranged on the second height plane, and the bottom of the confluence trough is sloped. The slope of the bottom of the confluence trough relative to the bottom of the ladle is 3-10 degrees, and the bottom of the slope is at the same height as the third height plane.

4. The ladle bottom structure according to claim 3, characterized in that: The inclination gradient of the confluence trough is 3 degrees.

5. The ladle bottom structure according to claim 3, characterized in that: The inclination gradient of the confluence trough is 5 degrees.

6. The ladle bottom structure according to claim 3, characterized in that: The inclination gradient of the confluence trough is 10 degrees.

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