Tundish slag blocking wall not prone to being damaged

Abstract

The utility model discloses a tundish slag blocking wall not easy to damage, belongs to the technical field of tundish equipment, and is used for prolonging the service life of the tundish slag blocking wall. According to the technical scheme, a reinforcing beam is arranged at the upper end of the slag stopping wall and is in the length direction of the top face of the slag stopping wall, the reinforcing beam and a wall body of the slag stopping wall are poured into a whole, a slag discharging hole is formed in the middle of the upper end of a middle wall body below the reinforcing beam and is square, and a left steel flowing hole and a right steel flowing hole are formed in the lower portion of a left wall body and the lower portion of a right wall body respectively. The left steel flowing hole and the right steel flowing hole are circular-truncated-cone-shaped holes respectively, the inlet hole diameters of the left steel flowing hole and the right steel flowing hole are larger than the outlet hole diameters, and the thickness of the wall body slag line portion on the upper portion of the slag stopping wall is larger than that of the lower portion of the wall body. The utility model has the advantages of simple structure and favorable effect, can improve the structural strength of the slag wall, prevent the slag wall from cracking in the later period of use, improve the erosion resistance of the slag line part of the wall body, prolong the service life of the slag wall, and reduce the erosion rate of the steel flow hole of the slag wall.

Description

Technical Field

[0001] The utility model relates to a tundish slag retaining wall and belongs to the technical field of tundish equipment. Background Art

[0002] The tundish is an indispensable and important container in the continuous casting process of molten steel. It mainly plays the role of stabilizing the flow of molten steel, removing inclusions, diverting and ensuring the continuous casting of molten steel. According to the functional structure of the tundish, it can be divided into three parts: the first is the lining part, which includes the refractory materials for the bottom and side walls of the container of the tundish, usually composed of an insulation layer, a permanent layer, a working layer and an impact zone. This part is the largest amount of refractory materials used in the tundish; the second is the slag filtering part, including slag retaining walls, slag retaining weirs, flow stabilizers, air curtains, ceramic filters, etc., the main function is to remove slag, purify molten steel, and improve steel quality; the third is the flow control part, which is composed of stopper rods, sizing nozzles, immersion nozzles and sliding nozzles.

[0003] The slag retaining wall is installed in the impact zone, enclosing the impact zone into a space, which belongs to the filtering part of the tundish. The current slag retaining wall is designed with two U-shaped slag discharge ports on the upper part and four circular steel flow holes on the lower part. After the molten steel injected into the tundish by the ladle enters the impact zone, it flows out from the steel flow holes, and the slag floats to the surface of the impact zone, is discharged from the slag discharge holes, and then flows out from the slag discharge trough of the tundish. There are three defects in the existing slag retaining wall. First, there is a thermal stress concentration phenomenon in the slag discharge port of the U-shaped slag retaining wall, which is prone to cracks and causes the slag retaining wall to break. It is very easy to break when the liquid level of the tundish is unstable; second, the circular steel flow holes of the slag retaining wall are severely eroded by the impact of a large flow of molten steel; third, the slag line of the slag retaining wall is severely eroded by the slag layer, and the life span is not synchronized with other parts. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a tundish slag retaining wall which is not easily damaged. The tundish slag retaining wall can improve the structural strength of the slag retaining wall and prevent the slag retaining wall from cracking and breaking in the later period of use. At the same time, it can also improve the corrosion resistance of the slag line part of the slag retaining wall to achieve synchronous corrosion with other parts, thereby increasing the service life of the slag retaining wall and reducing the erosion rate of the flow steel holes of the slag retaining wall.

[0005] The technical solution to solve the above technical problems is:

[0006] A tundish slag retaining wall which is not easily damaged comprises a left wall, a right wall and a middle wall, wherein the left wall, the right wall and the middle wall are connected as a whole, and the left wall and the right wall are respectively inclined to the left and right sides with the middle wall, wherein the improvement is that a reinforcing beam is provided at the upper end of the slag retaining wall, and the reinforcing beam is along the length direction of the top surface of the slag retaining wall, and the reinforcing beam and the wall body of the slag retaining wall are cast as a whole, and a slag discharge hole is provided at the middle position of the upper end of the middle wall below the reinforcing beam, and the slag discharge hole is square, and a left flow steel hole and a right flow steel hole are respectively provided at the lower part of the left wall and the right wall, and the left flow steel hole and the right flow steel hole are respectively truncated cone-shaped holes, and the inlet aperture of the left flow steel hole and the right flow steel hole is larger than the outlet aperture, and the thickness of the slag line part of the upper part of the slag retaining wall is greater than the thickness of the lower part of the wall.

[0007] The above-mentioned indestructible tundish slag retaining wall has a thickness of 100-150mm, a width of the slag discharge hole of 200-230mm, a height of 130-150mm, an inlet aperture of the left and right flow steel holes of 110-115mm, an outlet aperture of 100-105mm, a thickness of the wall at the slag line of 260-270mm, and a thickness of the lower part of the slag retaining wall of 160-170mm.

[0008] The beneficial effects of the utility model are:

[0009] The utility model adds a reinforcing beam, which is cast as an integral part of the slag retaining wall. The slag discharge hole is a closed square hole, which avoids the thermal stress concentration phenomenon in the slag discharge hole and causes cracks. The steel flow hole and the slag discharge hole are respectively located on different sides of the slag retaining wall. These improvements can improve the structural strength of the slag retaining wall and prevent it from being broken during use; the shape of the steel flow hole is designed to be a truncated cone, and the inlet diameter is larger than the outlet diameter, which can weaken the erosion of the steel hole by molten steel and slow down the expansion speed of the steel flow hole; the thickness of the slag line part of the slag retaining wall is increased, which can slow down the erosion speed of the slag line part of the wall, achieve synchronous erosion with other parts, and increase the life of the slag retaining wall.

[0010] The utility model has a simple structure and good effect. It can improve the structural strength of the slag retaining wall and prevent the slag retaining wall from cracking and breaking in the later period of use. At the same time, it can also improve the corrosion resistance of the slag line part of the wall, increase the service life of the slag retaining wall, and reduce the erosion rate of the flow steel hole of the slag retaining wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is the front view of the utility model;

[0012] Figure 2 yes Figure 1 A top view of

[0013] Figure 3 yes Figure 2 AA section view;

[0014] Figure 4 It is a cross-sectional view of the utility model installed in a tundish.

[0015] The markings in the figure are as follows: left wall 1, right wall 2, middle wall 3, reinforcing beam 4, slag discharge hole 5, left steel flow hole 6, right steel flow hole 7, wall slag line part 8, hook 9, tundish 10, molten steel level height M, slag layer thickness N. DETAILED DESCRIPTION

[0016] The utility model is composed of a left wall 1, a right wall 2, a middle wall 3, a reinforcing beam 4, a slag discharge hole 5, a left steel flow hole 6, a right steel flow hole 7 and a hook 9.

[0017] Figure 1 , 2 3 shows that the left wall 1, the right wall 2 and the middle wall 3 are connected as a whole, and the left wall 1 and the right wall 2 are inclined to the left and right sides with the middle wall 3 respectively.

[0018] Figure 1 , 2 3 shows that there is a reinforcing beam 4 at the upper end of the slag retaining wall, and the reinforcing beam 4 is along the length direction of the top surface of the slag retaining wall, and the reinforcing beam 4 is cast as one with the wall body of the slag retaining wall. The thickness of the reinforcing beam 4 is 100-150mm, and the reinforcing beam 4 can improve the structural strength of the slag retaining wall and prevent the slag retaining wall from cracking and breaking in the later use.

[0019] Figure 1 , 2 3 shows that the utility model changes the two slag discharge holes distributed on both sides of the existing slag retaining wall into a slag discharge hole 5 in the middle of the middle wall 3. The shape of the slag discharge hole 5 is changed from an open U-shape to a closed square hole, which avoids the thermal stress concentration phenomenon in the slag discharge hole 5 and causes cracks. At the same time, the slag discharge hole 5 is located below the reinforcing beam 4, which strengthens the strength of the slag discharge hole 5. The width of the slag discharge hole 5 is 200-230mm and the height is 130-150mm.

[0020] Figure 1 , 2 3 shows that the utility model combines the two existing steel flow holes on the left wall 1 and the right wall 2 into a left steel flow hole 6 and a right steel flow hole 7, thereby reducing the number of steel flow holes on the wall, improving the structural strength of the slag retaining wall, and preventing it from being broken during use.

[0021] Figure 1 , 2 3 shows that the left flow steel hole 6 and the right flow steel hole 7 are truncated cone-shaped holes, and the inlet aperture of the left flow steel hole 6 and the right flow steel hole 7 is larger than the outlet aperture. The inlet aperture of the left flow steel hole 6 and the right flow steel hole 7 is 195-205mm, and the outlet aperture is 175-185mm, which can weaken the erosion of the steel hole by molten steel and slow down the expansion speed of the flow steel hole.

[0022] Figure 1 , 2 3 shows that the utility model increases the thickness of the slag line part 8 of the upper part of the slag retaining wall, so that the thickness of the slag line part 8 of the wall is greater than the thickness of the lower part of the wall. The thickness of the slag line part of the wall is 260-270mm, and the thickness of the lower part of the slag retaining wall is 160-170mm. With such a structure, the erosion speed of the slag line part 8 of the wall can be slowed down, so that it can be eroded synchronously with other parts, thereby increasing the life of the slag retaining wall.

[0023] Figure 4 It is shown that the use process of the utility model is as follows:

[0024] The slag retaining wall is made of aluminum-magnesium castable material, which is batched, dry mixed, wet mixed, poured into the mold, vibrated, demoulded, cured for 12 hours, and dried in a drying furnace for 36 hours. During the manufacturing process of the slag retaining wall, the hook 9 is cast in the slag retaining wall according to the size and position to facilitate lifting;

[0025] The slag retaining wall is hoisted into the tundish 10 by using the hook 9, and the joint between the slag retaining wall and the tundish 10 is sealed with fire clay. The installation of the slag retaining wall in the tundish 10 is completed;

[0026] The slag retaining wall and the working layer of the tundish are baked at the same time and are used after baking. The molten steel is first injected into the space of the tundish impact zone surrounded by the slag retaining wall and the tundish 10, and the molten steel flows out from the left flow steel hole 6 and the right flow steel hole 7 of the slag retaining wall. The slag has a smaller specific gravity than the molten steel, so it floats on the molten steel, flows out from the slag discharge hole 5, and is then discharged from the tundish slag discharge trough. The height of the molten steel liquid level is M, and the thickness of the slag layer is N.

[0027] An embodiment of the present utility model is as follows:

[0028] The width of the left wall 1 and the right wall 2 is 600mm, the height is 1100mm, and the thickness is 160mm;

[0029] The width of the middle wall 3 is 750 mm, the height is 1100 mm, and the thickness is 160 mm;

[0030] The width of the reinforcement beam 4 is 600 mm and the thickness is 100 mm.

[0031] The length of the slag hole 5 is 200 mm and the width is 150 mm;

[0032] The inlet diameter of the left flow steel hole 6 and the right flow steel hole 7 is 195 mm, and the outlet diameter is 175 mm;

[0033] The width of the wall slag line part 8 is and the thickness is 260mm.

Claims

1. A tundish slag retaining wall which is not easily damaged, comprising a left wall (1), a right wall (2), and a middle wall (3), wherein the left wall (1), the right wall (2), and the middle wall (3) are connected as a whole, and the left wall (1) and the right wall (2) are inclined to the left and right sides of the middle wall (3), respectively, and characterized in that: The upper end of the slag retaining wall is provided with a reinforcing beam (4), which is along the length direction of the top surface of the slag retaining wall. The reinforcing beam (4) and the wall body of the slag retaining wall are cast as one piece. A slag discharge hole (5) is provided at the middle position of the upper end of the middle wall body (3) below the reinforcing beam (4). The slag discharge hole (5) is square. The lower parts of the left wall body (1) and the right wall body (2) are provided with a left flow steel hole (6) and a right flow steel hole (7), respectively. The left flow steel hole (6) and the right flow steel hole (7) are respectively truncated cone-shaped holes. The inlet apertures of the left flow steel hole (6) and the right flow steel hole (7) are larger than the outlet apertures. The thickness of the slag line part (8) of the upper part of the slag retaining wall is larger than the thickness of the lower part of the wall.

2. The non-damageable tundish slag retaining wall according to claim 1, characterized in that: The thickness of the reinforcing beam (4) is 100-150 mm, the width of the slag discharge hole (5) is 200-230 mm, the height is 130-150 mm, the inlet apertures of the left flow steel hole (6) and the right flow steel hole (7) are 110-115 mm, and the outlet apertures are 100-105 mm, the thickness of the slag line portion (8) of the wall is 260-270 mm, and the thickness of the lower part of the slag retaining wall is 160-170 mm.

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