Furnace mouth precast block structure of torpedo car for preventing iron leakage

Abstract

The utility model discloses a torpedo car furnace mouth precast block structure for preventing iron leakage, which comprises an arc-shaped precast block body and an anchoring part, a step is arranged on the outer arc surface of the arc-shaped precast block body, and the included angle between the side surface of the step and the top surface of the arc-shaped precast block body is 75 degrees. The anchoring parts are arranged in the arc-shaped precast block body at intervals in the circumferential direction and located on the side face of the step, an arc-shaped groove is formed in the middle of the inner arc face of the arc-shaped precast block body in the circumferential direction, and arc-shaped notches are formed in the rear portions of side edges on the two sides of the inner arc face of the arc-shaped precast block body in the length direction. The precast block structure serves as a permanent layer of a furnace mouth working face and is used for preventing molten iron from permeating, iron leakage accidents at the furnace mouth are prevented, and safe use of the torpedo car is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial furnaces, in particular to a precast block structure for the ladle furnace mouth for preventing iron leakage. Background Technique

[0002] A ladle is a container for transporting molten iron. Its main function is to receive molten iron from a blast furnace and transport it to a steelmaking pouring station. The molten iron is poured from the ladle furnace mouth into a molten iron ladle. When the ladle is overhauled, the whole furnace mouth is cast with high-aluminum castable, and the construction method uses positive formwork. Among them, the two iron tapping surfaces on both sides are the working surfaces of the furnace mouth. The working surface of the iron tapping port of the furnace mouth will be scoured by molten iron during the whole iron tapping process, and at the same time, it will bear the static pressure of the molten iron. As the number of iron tapping times increases, the furnace mouth part will also be subjected to multiple thermal and cold shocks, resulting in various cracks in the working surface parts on both sides of the furnace mouth and the surrounding areas. These cracks will continuously expand towards the back during use due to the scouring, penetration and thermal and cold stress of the molten iron, which is likely to cause iron leakage accidents at the furnace mouth. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a precast block structure for the ladle furnace mouth for preventing iron leakage. This precast block structure serves as the permanent layer of the working surface of the furnace mouth, is used to prevent the penetration of molten iron, prevent the occurrence of iron leakage accidents at the furnace mouth, and realize the safe use of the ladle.

[0004] To solve the above technical problems, the precast block structure for the ladle furnace mouth for preventing iron leakage of the utility model includes an arc-shaped precast block body and anchor bolts. A step is provided on the outer arc surface of the arc-shaped precast block body. The included angle between the side surface of the step and the top surface of the arc-shaped precast block body is 75 degrees. The anchor bolts are arranged at intervals along the circumferential direction inside the arc-shaped precast block body and are located at the side surface position of the step. An arc-shaped groove is provided in the middle of the inner arc surface of the arc-shaped precast block body along the circumferential direction. Arc-shaped notches are respectively provided at the rear parts of the two side edges of the inner arc surface of the arc-shaped precast block body along the length direction.

[0005] Further, chamfers of 20mm×20mm are provided on the two side edges of the inner arc surface of the arc-shaped precast block body.

[0006] Further, the diameters of the arc-shaped groove and the arc-shaped notch are 30mm.

[0007] Further, the anchor bolts are steel bars with a diameter of 8mm and a spacing of 150mm.

[0008] Further, threaded lifting holes are provided at intervals on the top surface of the arc-shaped precast block body.

[0009] Since the tundish mouth precast block structure for preventing molten iron leakage of the present utility model adopts the above technical solution, that is, this structure includes an arc-shaped precast block body and anchor bolts. A step is provided on the outer arc surface of the arc-shaped precast block body, and the included angle between the side surface of the step and the top surface of the arc-shaped precast block body is 75 degrees. The anchor bolts are arranged at intervals along the circumferential direction inside the arc-shaped precast block body and are located at the position of the side surface of the step. An arc-shaped groove is provided along the circumferential direction in the middle of the inner arc surface of the arc-shaped precast block body, and arc-shaped notches are respectively provided along the length direction at the rear parts of the two side edges of the inner arc surface of the arc-shaped precast block body. This precast block structure serves as the permanent layer of the tundish mouth working surface, which is used to prevent the penetration of molten iron and prevent the occurrence of tundish mouth leakage accidents, so as to realize the safe use of the torpedo car. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present utility model will be further described in detail below in conjunction with the drawings and embodiments:

[0011] Figure 1 FIG. is a schematic diagram of the tundish mouth precast block structure for preventing molten iron leakage of the present utility model;

[0012] Figure 2 FIG. is a schematic diagram of the installation of this precast block structure at the tundish mouth of the torpedo car. SPECIFIC EMBODIMENTS

[0013] As shown in the embodiments Figure 1 The tundish mouth precast block structure for preventing molten iron leakage of the present utility model includes an arc-shaped precast block body 1 and anchor bolts 2. A step 11 is provided on the outer arc surface of the arc-shaped precast block body 1, and the included angle between the side surface 12 of the step and the top surface of the arc-shaped precast block body 1 is 75 degrees. The anchor bolts 2 are arranged at intervals along the circumferential direction inside the arc-shaped precast block body 1 and are located at the position of the side surface 12 of the step. An arc-shaped groove 13 is provided along the circumferential direction in the middle of the inner arc surface of the arc-shaped precast block body 1, and arc-shaped notches 15 are respectively provided along the length direction at the rear parts of the two side edges 14 of the inner arc surface of the arc-shaped precast block body 1.

[0014] Preferably, chamfers of 20 mm × 20 mm are provided on the two side edges 14 of the inner arc surface of the arc-shaped precast block body 1. The chamfer setting can prevent defects such as cracking and spalling of the bonding surface between the arc-shaped precast block body and the high-alumina castable at the tundish mouth of the torpedo car caused by thermal stress concentration.

[0015] Preferably, the diameters of the arc-shaped groove 13 and the arc-shaped notch 15 are 30 mm.

[0016] Preferably, the anchor bolts 2 are steel bars with a diameter of 8 mm and a spacing of 150 mm.

[0017] Preferably, threaded lifting holes 16 are provided at intervals on the top surface of the arc-shaped precast block body 1. The single weight of the precast block is 140 kg, and it needs to be installed by hoisting with a crane. The threaded lifting holes are used to install detachable lifting lugs to facilitate the hoisting operation of the precast block, and the lifting lugs are removed after the hoisting operation is completed.

[0018] As shown Figure 2 in the figure, the arc-shaped precast block body 1 is hung on the edge of the furnace mouth 3 through the steps on the outer arc surface, and both sides are welded to the furnace mouth steel shell 31 through anchor bolts. The steps and anchor bolts play a role in fixing the precast block at the same time. The material used for the precast block is the same as that of the furnace mouth castable, and high-aluminum castable is used. The precast block is installed at the steel shell of the working surface of the furnace mouth and is required to be closely attached to the surface of the steel shell. The remaining part of the furnace mouth is still constructed by the positive formwork method of high-aluminum furnace mouth castable. When cracks appear in the working layer castable, the molten iron seeps downward along the cracks, and the precast block can play a role in preventing the molten iron from continuing to seep, thus preventing the occurrence of molten iron leakage accidents at the furnace mouth.

[0019] Among them, the arc-shaped notches at the rear of the side edges on both sides of the inner arc surface of the arc-shaped precast block body form an interlocking structure with the castable after the furnace mouth construction, which plays a role in preventing the molten iron from seeping radially along the interface between the precast block and the castable to the furnace shell. Similarly, the arc-shaped groove in the middle of the inner arc surface of the arc-shaped precast block body forms an interlocking structure with the castable after the furnace mouth construction, which plays a role in preventing the molten iron from seeping downward along the interface from above. The side surface of the step on the outer arc surface of the arc-shaped precast block body is set to be the same as the horizontal angle of the steel shell at the furnace mouth, so that the outer arc surface of the arc-shaped precast block body can be closely attached to the steel shell.

[0020] By installing this precast block structure on both sides of the working surface of the torpedo car furnace mouth as the permanent layer, it can be closely attached to the torpedo car furnace mouth steel shell. During the construction of the furnace mouth refractories, the precast block and the castable are interlocked into a whole through the designed arc-shaped grooves and arc-shaped notches. After use, no dangerous signs such as molten iron leakage at the furnace mouth have occurred again, thus ensuring the safe use of the torpedo car.

Claims

1. A prefabricated block structure for a furnace mouth of a mixing iron car for preventing iron leakage, characterized in that: It comprises an arc-shaped prefabricated block body and an anchor, wherein the outer arc surface of the arc-shaped prefabricated block body is provided with a step, and the angle between the side surface of the step and the top surface of the arc-shaped prefabricated block body is 75 degrees, the anchor is arranged in the arc-shaped prefabricated block body at intervals along the circumferential direction and is located at the side surface of the step, an arc-shaped groove is provided in the middle of the inner arc surface of the arc-shaped prefabricated block body along the circumferential direction, and arc-shaped notches are respectively provided at the rear of the side edges on both sides of the inner arc surface of the arc-shaped prefabricated block body along the length direction.

2. The prefabricated block structure for preventing iron leakage in a mixing car furnace according to claim 1, characterized in that: The side edges on both sides of the inner arc surface of the arc-shaped prefabricated block body are provided with chamfers of 20mm×20mm.

3. The prefabricated block structure for preventing iron leakage in a mixing car furnace according to claim 1 or 2, characterized in that: The diameter of the arc-shaped groove and the arc-shaped notch is 30 mm.

4. The prefabricated block structure for preventing iron leakage in a mixing car furnace according to claim 3 is characterized in that: The anchors are steel bars with a diameter of 8 mm and a spacing of 150 mm.

5. The prefabricated block structure for preventing iron leakage in a mixing car furnace mouth according to claim 3, characterized in that: The top surface of the arc-shaped prefabricated block body is provided with threaded hanging holes at intervals.

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