A method for installing a tundish impact cup

Abstract

The application relates to a tundish impact cup mounting method and belongs to the technical field of steelmaking in the metallurgical industry. The technical scheme is as follows: a chamfer (8) is processed at the lower part of the impact cup (7); a trapezoidal gap (9) is formed at the lower part of the tundish end face guard plate (5); the impact cup (7) is mounted on the tundish bottom working layer (3); the end face guard plate (5) is tightly attached to the impact area working layer, so that the trapezoidal gap (9) at the lower part of the end face guard plate (5) is clamped on the side of the impact cup (7); the left guard plate (4) and the right guard plate (6) are mounted on the two sides of the impact cup (7), and the left guard plate (4), the end face guard plate (5) and the right guard plate (6) form the guard plate of the impact cup (7); dry material is filled between the guard plate and the impact cup (7). The application has the beneficial effects that the center line of the impact cup can coincide with the flow center line of the ladle, the guard plate can be tightly matched with the impact cup, the protection of the guard plate can be realized, and the penetration accident can be prevented.

Description

Technical Field

[0001] This invention relates to a method for installing an impact cup in an tundish, belonging to the field of steelmaking technology in the metallurgical industry. Background Technology

[0002] The tundish is an indispensable vessel in the continuous casting process of molten steel, primarily serving to stabilize the molten steel flow rate, remove inclusions, divert the flow, and ensure continuous casting without interruption. The tundish consists of the shell, the permanent layer, and the working layer. The part of the tundish that directly receives the molten steel from the ladle is called the impact zone because it must withstand the strong static pressure and impact force of the molten steel. Compared to other parts of the tundish, the working environment in the impact zone is much harsher.

[0003] See attached document Figure 2 , 3 The impact zone of the tundish is surrounded on three sides by a precast aluminum-magnesium spinel refractory material, consisting of a left protective plate, a right protective plate, and an end face protective plate. The bottom of the impact zone has a circular impact cup. The impact cup has excellent impact resistance, capable of withstanding the enormous impact force of the ladle's molten steel flow. It is required that "the centerline of the impact cup coincides with the centerline of the ladle's molten steel flow after installation." If the ladle flow and the impact cup flow do not coincide, resulting in "deviation," it will cause severe erosion at the tundish impact point, easily leading to molten steel penetration accidents.

[0004] In the design of continuous casting machines, the position of the crystallizer is fixed, and the centerline of the tundish nozzle coincides with the centerline of the crystallizer; therefore, the position of the tundish is also fixed. Simultaneously, the fixed position of the ladle leads to a fixed position of the steel flow impact point. Therefore, only by moving the impact cup can the technical requirement that "after installation, the centerline of the impact cup coincides with the centerline of the steel flow in the ladle" be met, as shown in the attached diagram. Figure 1 As shown.

[0005] The current tundish impact zone space is narrow, and the end face guard plate prevents the impact cup from shifting to the left. The actual distance between the centerline of the impact cup and the centerline of the ladle steel flow is smaller than the theoretical distance, as shown in the attached figure. Figure 1 , 3 As shown, this can easily cause the steel flow to deviate, and the steel flow may hit the edge of the impact cup, resulting in a puncture accident. Summary of the Invention

[0006] The purpose of this invention is to provide an installation method for an tundish impact cup that ensures the centerline of the impact cup coincides with the centerline of the ladle flow, and achieves a tight fit between the protective plate and the impact cup, thereby providing the protective function of the protective plate, preventing ladle penetration accidents, and solving the problems existing in the background art.

[0007] The technical solution of this invention is: A method for installing an intermediate liner impact cup, comprising the following steps: Step 1: Machine a chamfer at the bottom of the impact cup; Step 2: Make a trapezoidal notch at the bottom of the end face guard plate of the tundish; Step 3: Install the impact cup on the bottom working layer of the sprue, and adjust the center line of the impact cup to be aligned with the center line of the sprue. Step 4: Press the end face guard plate firmly against the working layer of the impact zone, so that the upper edge of the trapezoidal notch at the bottom of the end face guard plate is locked onto the edge of the impact cup; Step 5: Install the left and right guard plates on both sides of the impact cup. The left guard plate, end face guard plate and right guard plate constitute the guard plate of the impact cup. Step 6: Fill the space between the guard plate and the impact cup with dry material.

[0008] The chamfer angle N at the bottom of the impact cup is equal to the angle W of the dry material in the working layer of the impact zone end face of the tundish.

[0009] The chamfer angle N at the bottom of the impact cup and the dry material angle W at the end face of the working layer of the impact zone of the tundish are both 100°.

[0010] In step two, the trapezoidal notch at the bottom of the end face guard plate is an isosceles trapezoid.

[0011] In step four, a gap is provided between the trapezoidal notch at the bottom of the end face guard plate and the impact cup.

[0012] The gap between the trapezoidal notch at the bottom of the end face guard plate and the impact cup is filled with dry material.

[0013] The beneficial effects of this invention are: it can ensure that the center line of the impact cup coincides with the center line of the ladle flow, and it can also achieve a tight fit between the protective plate and the impact cup, so as to play the protective role of the protective plate and prevent the ladle penetration accident. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the intermediate package operation in the background technology. Figure 2 This is a schematic diagram of the impact zone of the intermediate package in the background technology. Figure 3 for Figure 2 AA section view; Figure 4 This is a front view of the impact cup of the present invention; Figure 5 This is a top view of the impact cup of the present invention; Figure 6 This is a front view of the front end cover plate of the present invention; Figure 7 This is a front view of the rear end faceplate of the present invention; Figure 8 This is a cross-sectional view of the rear end faceplate of the present invention. Figure 9This is a top view of the rear end face guard plate and the impact cup of the present invention. Figure 10 This is a TT cross-sectional view of the rear end face guard plate and the impact cup of the present invention. Figure 11 This is a diagram showing the mating of the rear end face guard plate and the impact cup of the present invention; In the diagram: 1. Tundish shell, 2. Permanent layer, 3. Working layer, 4. Left protective plate, 5. End face protective plate, 6. Right protective plate, 7. Impact cup, 8. Chamfer, 9. Trapezoidal notch, 10. Dry material, 11. Steel ladle, 12. Tundish, 13. Crystallizer. Detailed Implementation

[0015] The invention will be further described below with reference to the accompanying drawings and examples.

[0016] See attached document Figure 1 , 2 A method for installing an intermediate liner impact cup, following these steps: Step 1: Machin a chamfer 8 on the lower part of the impact cup 7; Step 2: Make a trapezoidal notch 9 at the bottom of the end face guard plate 5 of the intermediate liner; Step 3: Install the impact cup 7 on the bottom working layer 3 of the sprue, and adjust the center line of the impact cup 7 to the center line of the sprue so that the center line of the impact cup 7 is aligned with the center line of the sprue. Step 4: Press the end face guard plate 5 tightly against the working layer of the impact zone, so that the upper edge of the trapezoidal notch 9 at the bottom of the end face guard plate 5 is locked onto the edge of the impact cup 7; Step 5: Install the left guard plate 4 and the right guard plate 6 on both sides of the impact cup 7. The left guard plate 4, the end face guard plate 5 and the right guard plate 6 constitute the guard plate of the impact cup 7. Step 6: Fill the space between the guard plate and the impact cup 7 with dry material.

[0017] In this embodiment, refer to the appendix Figure 1-11 The installation method for the intermediate liner impact cup is as follows: (1) Design of the chamfered impact cup The impact cups in the tundish are aligned with the steel flow, as shown in the attached diagram. Figure 1 Design a beveled impact cup, as shown in the attached image. Figure 4 , 5 As shown, the technical requirement of "aligning the centerline of the impact cup with the steel flow in the ladle" is ensured. Considering that the current distance L (836mm) between the impact cup and the centerline of the nozzle is less than the distance M (950mm) between the steel flow and the centerline of the nozzle, the impact cup needs to be moved towards the end face guard plate of the tundish. However, the bottom of the impact cup is already interfering with the end face guard plate of the tundish. Therefore, a chamfer 8 is machined on the lower part of the impact cup 7.

[0018] (2) Design of the end face guard plate of the tundish According to the schematic diagram of the intersection line between the end face guard plate 5 and the impact cup 7, as follows: Figure 11 Design the intermediate tundish end face guard plate 5, as shown in the attached document. Figure 7 , 8 As shown, its characteristic is a trapezoidal notch 9 at the bottom. The length A of the upper base of the trapezoidal notch 9 is 303mm, which is less than the length B (383mm) of the interference line between the original end face guard plate and the upper edge of the impact cup. BA = 80mm, meaning there is a 40mm gap between the upper edge of the trapezoidal notch 9 and the edge of the impact cup. The length C of the lower base of the trapezoidal notch 9 is 593mm, which is greater than the length D (493mm) of the lower edge of the original end face guard plate and the impact cup. DC = 100mm, meaning there is a 50mm gap between the lower opening edge and the edge of the impact cup. (See attached diagram.) Figure 11 .

[0019] (3) Install the impact cup Install the impact cup 7 on the working layer at the bottom of the ladle. Ensure the chamfer 8 of the impact cup 7 is flush against the dry material on the end face of the working layer. Adjust the centerline of the impact cup 7 to align with the centerline of the nozzle, using a design theoretical value of 950mm. Ensure the impact cup 7 is aligned with the ladle nozzle. (See attached...) Figure 10 .

[0020] (4) Install end face guard plate The end face guard plate 5 is hoisted above the impact cup 7, ensuring it is tightly fitted against the working layer of the impact zone. The upper edge of the trapezoidal notch 9 is engaged with the edge of the impact cup 7. The upper edge of the trapezoidal notch 9 is designed at a 100° angle. Figure 8 As shown, this ensures that the end face guard plate 5 fits tightly against the upper edge of the chamfered impact cup 7, as... Figure 10 As shown.

[0021] (5) Install the left and right guard plates Left guard plate 4 and right guard plate 6 are installed on both sides of the impact cup 7. The left guard plate 4, end face guard plate 5, and right guard plate 6 constitute the guard plate of the impact cup 7, as shown in the attached figure. Figure 9 As shown.

[0022] (6) Fill with dry material. After the guard plate and impact cup are installed, fill the gap between the guard plate and the impact cup with dry material. Because a 40mm gap is left between the upper edge of the notch in the end face guard plate and the edge of the impact cup, and a 50mm gap is left between the lower opening edge of the notch and the edge of the impact cup, the dry material can flow in through the gaps and fill all the gaps. Figure 9 This prevents molten steel from seeping in. At this point, the impact zone construction is complete.

[0023] The innovative aspects of this invention: (1) The impact cup 7 is designed with a chamfered shape, and the chamfer angle N ( Figure 4 The angle W between the dry material in the working layer of the impact zone end face of the tundish and the angle between the dry material ... Figure 3Equal N=W=100° ensures the impact cup is tightly fitted to the dry material on the end face during installation. Chamfer distance E=114mm ( Figure 4 The condition E+L(836mm)=M=950mm is satisfied. Figure 1 ).

[0024] (2) Design of the end face guard plate of the tundish. A trapezoidal notch 9 is cut into the lower part of the end face guard plate 5. The length A (303mm) of the upper base of the trapezoidal notch 9 is greater than the length B (383mm) of the interference line between the original end face guard plate and the upper edge of the impact cup. BA = 80mm, meaning there is a 40mm gap between the upper edge of the trapezoidal notch 9 and the edge of the impact cup. The length C (593mm) of the lower base of the trapezoidal notch 9 is greater than the length D (493mm) of the interference line between the original end face guard plate and the lower edge of the impact cup. DC = 100mm, meaning there is a 50mm gap between the lower opening edge and the edge of the impact cup. Figure 11 ).

[0025] (3) The lower part of the tundish end face guard plate 5 is an isosceles trapezoidal notch, and the upper edge of the notch is designed at an angle H ( Figure 8 And satisfy H=N=W=100° ( Figure 4 , Figure 8 , Figure 3 This ensures that the guard plate fits tightly against the upper edge of the chamfered impact cup.

[0026] (4) After the end plate and impact cup are installed, the gap between the impact cup and the end plate should be filled with dry filler material, because a 40mm gap is left between the upper edge of the notch in the end plate and the edge of the impact cup. A 50mm gap is left between the lower opening edge of the notch and the edge of the impact cup, allowing the dry filler material to flow in and fill all the gaps. Figure 9 This prevents molten steel from seeping in.

Claims

1. A method for installing an intermediate liner impact cup, characterized in that: Follow these steps: Step 1: Machin a chamfer (8) on the lower part of the impact cup (7); Step 2: Make a trapezoidal notch (9) at the bottom of the end face guard plate (5) of the intermediate package. Step 3: Install the impact cup (7) on the bottom working layer (3), and adjust the center line of the impact cup (7) and the center line of the nozzle so that the center line of the impact cup (7) and the center line of the nozzle are aligned. Step 4: Press the end face guard plate (5) tightly against the working layer of the impact zone, so that the upper edge of the trapezoidal notch (9) at the bottom of the end face guard plate (5) is stuck on the edge of the impact cup (7); Step 5: Install the left guard plate (4) and the right guard plate (6) on both sides of the impact cup (7). The left guard plate (4), the end face guard plate (5) and the right guard plate (6) constitute the guard plate of the impact cup (7); Step 6: Fill the space between the guard plate and the impact cup (7) with dry material.

2. The method for installing an intermediate liner impact cup according to claim 1, characterized in that: The chamfer (8) angle N at the bottom of the impact cup (7) is equal to the angle W of the dry material in the working layer of the impact zone end face of the tundish.

3. The method for installing an intermediate liner impact cup according to claim 2, characterized in that: The chamfer (8) angle N at the bottom of the impact cup (7) and the dry material angle W at the working layer of the impact zone end face of the tundish are both 100°.

4. The method for installing an intermediate ladle impact cup according to claim 1, characterized in that: In step two, the trapezoidal notch (9) at the bottom of the end face guard plate (5) is an isosceles trapezoid.

5. The method for installing an intermediate liner impact cup according to claim 1, characterized in that: In step four, a gap is provided between the trapezoidal notch (9) at the bottom of the end face guard plate (5) and the impact cup (7).

6. The method for installing an intermediate liner impact cup according to claim 5, characterized in that: The gap between the trapezoidal notch (9) at the bottom of the end face guard plate (5) and the impact cup (7) is filled with dry material.

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