Hot repair frame for hot repair of furnace slope of electric arc furnace

Abstract

The utility model relates to the technical field of hot repair of an electric arc furnace, and discloses a hot repair frame for hot repair of a furnace slope of the electric arc furnace, which comprises a cylindrical structural body, an inner hole of the cylindrical structural body is used for being opposite to an electrode of a furnace bottom in a hearth of the electric arc furnace, and an outer hole of the cylindrical structural body is used for being opposite to an electrode of a furnace bottom in the hearth of the electric arc furnace. The barrel wall of the barrel-shaped structural body is used for surrounding the peripheral side of the electrode, and the barrel-shaped structural body is made of steel; one end of each suspender is connected to the barrel wall of the barrel-shaped structural body, the other ends of the suspenders are connected, and the suspenders are made of steel. When the hot repair frame for hot repair of the furnace slope of the electric arc furnace is used for hot repair of the furnace slope of the electric arc furnace, the gradient of the repaired furnace slope can be greatly increased, the furnace life of a furnace body is effectively prolonged, the operation cost of the electric arc furnace is reduced, the potential safety hazard of the electric arc furnace in use can be reduced, the use of repair materials is reduced, and the repair cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal repair of electric arc furnaces, in particular to a thermal repair frame for thermal repair of a furnace slope of an electric arc furnace. Background Art

[0002] In the field of steel smelting, electric arc furnace is a common smelting equipment. With the increase of the number of times the electric arc furnace is used for steelmaking, the furnace slope is gradually eroded, especially the change of the shape of the furnace slope, which causes the local flow in the furnace during smelting. This can easily lead to serious local erosion of the furnace body. Therefore, in order to make the furnace body have a longer furnace life, reduce the operating cost of the electric arc furnace, and reduce the number and time of annual replacement of the electric arc furnace, the furnace slope needs to be repaired during the use of the electric arc furnace for steelmaking. The current traditional repair method uses a large amount of repair material for natural throwing. The amount of repair material used is large, and the angle of the repaired furnace slope is much smaller than the original furnace slope. There is still a relatively weak contact area between the lower part of the furnace lining and the furnace slope, which increases the risk of furnace penetration accidents in the later stage of the furnace body. Therefore, how to improve the angle of the repaired furnace slope is an issue that needs to be studied urgently. Utility Model Content

[0003] The purpose of the utility model is to provide a thermal repair frame for thermal repair of the furnace slope of an electric arc furnace. By using the thermal repair frame for thermal repair of the furnace slope of an electric arc furnace for thermal repair, the repaired furnace slope can have a better shape, the slope of the repaired furnace slope can be greatly increased, and it is close to the slope of a new furnace slope, thereby effectively extending the furnace life of the furnace body, reducing the operating cost of the electric arc furnace, reducing the safety hazards of the use of the electric arc furnace, and reducing the use of repair materials and reducing the repair cost.

[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0005] A method for hot repairing a furnace slope of an electric arc furnace, comprising:

[0006] The heat repair frame is placed in the furnace of the electric arc furnace. The heat repair frame includes a cylindrical structure made of steel. The inner hole of the cylindrical structure is opposite to the electrode at the bottom of the furnace. The cylindrical structure is located at the bottom of the furnace, and the cylindrical wall of the cylindrical structure is arranged around the outer circumference of the electrode.

[0007] Filling a preset repair material into the outer peripheral side of the cylindrical wall of the cylindrical structure so that the repair material is closely attached to the outer side of the cylindrical wall of the cylindrical structure;

[0008] The repair material is baked to set the shape of the repair material, and the cylindrical structure is melted to form a protective layer on the inner wall surface of the repair material facing the center of the furnace.

[0009] In the above-mentioned method for hot repairing the furnace slope of the electric arc furnace, since the cylindrical structure is upright in the vertical direction and the approximate direction of the cylindrical wall is in the vertical direction, the inclination angle of the cylindrical wall of the cylindrical structure is roughly the same as the inclination angle of the slope surface of the furnace slope after repair. Therefore, the slope of the furnace slope after repair by the method in this embodiment can form a larger slope. Compared with the furnace slope repaired by the direct sprinkling method in the current prior art, the slope of the furnace slope formed in this embodiment can be greatly improved and can be very close to the slope of the original furnace slope, which can increase the number of times the electric arc furnace is used after each repair, increase the overall furnace life by 10% to 50%, and increase the thickness of the furnace slope by 20% when the furnace is replaced. ~50%, greatly reducing safety hazards, and, since the cylindrical structure forms a barrier wall structure with a barrier function, when filling the furnace with repair material, there is a hot repair frame around the electrode, and no repair material extends into the area where the electrode is located, which will not affect the conductivity of the electrode, will not affect the formation of the arc, and the normal working performance of the furnace bottom electrode, and a filling space is formed between the cylindrical structure and the eroded furnace slope, so that the filling of the repair material has targeted positioning, and the repair material can be filled between the cylindrical structure and the eroded furnace slope, without excessive spillage of the repair material, thereby avoiding waste of the repair material, saving the repair material, and effectively reducing the repair cost.

[0010] Optionally, baking the repair material specifically includes:

[0011] Preset smelting materials are added into the furnace, and the electric arc furnace is started to bake the repair material.

[0012] Optionally, the baking temperature of the repair material is 1400°C to 1600°C.

[0013] Optionally, the baking time of the repair material is 30 minutes to 60 minutes.

[0014] Optionally, in a direction perpendicular to the bottom surface of the furnace, the height of the cylindrical structure is lower than a preset limit line of the molten steel level in the furnace.

[0015] Optionally, the slope of the furnace slope after the repair material is shaped is greater than 45° and less than 90°, and the slope of the furnace slope after the repair material is shaped is: the angle between the inner wall surface of the repair material facing the center of the furnace and the bottom surface of the furnace bottom facing the repair material.

[0016] Based on the same utility model concept, the utility model also provides a heat repair rack for hot repairing the furnace slope of an electric arc furnace, which is applied to any of the electric arc furnace hot repair methods provided in the above solutions, including:

[0017] A cylindrical structure, wherein the inner hole of the cylindrical structure is used to face the electrode at the furnace bottom in the furnace of the electric arc furnace, and the cylindrical wall of the cylindrical structure is used to surround the outer circumference of the electrode, and the material of the cylindrical structure is steel;

[0018] At least two suspension rods, one end of each suspension rod is connected to the cylindrical wall of the cylindrical structure, and the other ends of each suspension rod are connected, and the material of the suspension rods is steel.

[0019] Compared with the furnace slope repaired by direct throwing in the existing technology, the slope of the furnace slope formed by the hot repair frame of this scheme can be greatly improved, and can be very close to the slope of the original furnace slope, which can increase the number of times the electric arc furnace is used after each repair, and the overall furnace life is increased by 10% to 50%. The thickness of the furnace slope will also increase by 20% to 50% when the furnace is replaced, which greatly reduces the safety hazards. In addition, since the cylindrical structure forms a blocking wall structure with a blocking function, when filling the furnace with repair material, the hot repair frame surrounds the electrode, and no repair material extends into the area where the electrode is located, which will not affect the conductivity of the electrode, the formation of the arc, and the normal working performance of the furnace bottom electrode. A filling space is formed between the cylindrical structure and the eroded furnace slope, so that the filling of the repair material has targeted positioning, and the repair material can be filled between the cylindrical structure and the eroded furnace slope. There will be no excessive spillage of repair material, which can avoid waste of repair material, save repair material, and effectively reduce the repair cost.

[0020] Optionally, a plurality of support rods are connected to the inner side of the cylindrical wall of the cylindrical structure, and the support rods are used to support the cylindrical wall of the cylindrical structure. In the circumferential direction around the axial center line of the cylindrical structure, at least some of the support rods are distributed end to end along the inner side of the cylindrical wall of the cylindrical structure, and both ends of each support rod are connected to the inner side of the cylindrical wall of the cylindrical structure; the support rods are made of steel.

[0021] Optionally, the support rods distributed end to end along the inner side of the cylindrical wall of the cylindrical structure are substantially perpendicular to the axis of the cylindrical structure.

[0022] Optionally, a plurality of the support rods distributed end to end along the inner side of the cylindrical wall of the cylindrical structure constitute an annular support structure, and at least two of the annular support structures are provided on the inner side of the cylindrical wall along the extension direction of the axis of the cylindrical structure.

[0023] Optionally, in two adjacent annular support structures, two adjacent support rods are staggered in the extension direction of the axial center line of the cylindrical structure.

[0024] Optionally, the tubular structure is a cylindrical tubular structure; or,

[0025] The cylindrical structure is a truncated cone-shaped cylindrical structure having a first end and a second end opposite to each other. The diameter of the first end is smaller than that of the second end. The first end is used to connect with the bottom of the furnace of the electric arc furnace.

[0026] Optionally, when the cylindrical structure is a truncated cone-shaped cylindrical structure, the angle between the outer wall surface of the cylindrical wall of the cylindrical structure and the end surface of the first end toward the outside is greater than 45° and less than 90°.

[0027] Optionally, the suspension rods include three, the three suspension rods intersect at the same point, and the three suspension rods are connected at the intersection position; or,

[0028] The four suspension rods are intersected at the same point, and the four suspension rods are connected at the intersecting positions. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings constituting part of this application are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention.

[0030] Figure 1 A schematic flow chart of a method for thermally repairing an electric arc furnace slope provided by an embodiment of the present utility model;

[0031] Figure 2 A schematic diagram of the state of an electric arc furnace after the furnace slope is eroded provided by an embodiment of the utility model;

[0032] Figure 3 A schematic diagram of a state in which a heat repair rack provided by an embodiment of the present utility model is placed in an electric arc furnace for heat repair;

[0033] Figure 4 A schematic diagram of a state after a furnace slope in an electric arc furnace is repaired according to an embodiment of the present utility model;

[0034] Figure 5 A schematic structural diagram of a thermal repair frame provided by an embodiment of the present utility model;

[0035] Figure 6 A side view of a thermal repair frame provided in an embodiment of the present utility model.

[0036] Icons: 1-hot repair frame; 2-arc furnace; 3-repair material; 11-cylindrical structure; 12-support rod; 13-suspender rod; 21-lower furnace body; 22-furnace chamber; 23, 23'-furnace slope; 24-electrode. DETAILED DESCRIPTION

[0037] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with examples. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as part of one embodiment can be used in another embodiment to produce yet another embodiment. Therefore, it is intended that the present invention encompass such modifications and variations as come within the scope of the appended claims and their equivalents.

[0038] In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention. The terms "connected", "connected", and "set" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0039] refer to Figure 2 、 Figure 3 and Figure 4 ,like Figure 1 As shown, the present invention provides a method for thermally repairing the furnace slope of an electric arc furnace. For ease of description, the extension direction of the axis of the furnace mouth of the electric arc furnace is taken as the vertical direction, and the furnace bottom of the furnace is below the furnace mouth. Specifically, the method for thermally repairing the furnace slope of an electric arc furnace includes:

[0040] In step S101, the heat repair frame 1 is placed in the furnace 22 of the electric arc furnace 2. The heat repair frame 1 includes a cylindrical structure 11, which is made of steel. The inner hole of the cylindrical structure 11 is opposite to the electrode 24 at the bottom of the furnace 22. The cylindrical structure 11 is located at the bottom of the furnace 22, and the cylindrical wall of the cylindrical structure 11 is arranged around the outer peripheral side of the electrode 24.

[0041] In step S102 , a preset repair material 3 is filled into the outer peripheral side of the cylindrical wall of the cylindrical structure 11 so that the repair material 3 is in close contact with the outer side of the cylindrical wall of the cylindrical structure 11 .

[0042] In step S103 , the repair material 3 is baked to set the repair material 3 , melt the cylindrical structure 11 , and form a protective layer on the inner wall surface of the repair material 3 facing the center of the furnace 22 .

[0043] According to step S101, the heat repair frame 1 is placed in the furnace 22. Specifically, the electric arc furnace 2 includes a lower furnace body 21 and a furnace cover matched with the lower furnace body 21. The lower furnace body 21 has a furnace 22. The heat repair frame 1 can be lifted by a crane and then slowly moved into the furnace 22. The heat repair frame 1 is moved downward along the center of the furnace 22 and placed. Some auxiliary frame components are used to align the heat repair frame 1 with the center of the furnace 22 to maintain balance, so that the heat repair frame 1 is stably placed in the center of the furnace 22 and surrounds the outer periphery of the bottom electrode 24 to avoid affecting the arcing of the electrode 24. Preferably, the electrode 24 can be a conductive needle, and the slope of the eroded furnace slope 23' is small. After the heat repair frame 1 is placed stably, there will be a certain space between the heat repair frame 1 and the eroded furnace slope 23'. Then, according to step S102, an overhead crane is used to fill the repair material 3 in the cylinder. Between the outer peripheral side of the cylindrical structure 11 and the corroded furnace slope 23', the repair material 3 is attached to the outer side surface of the cylindrical wall of the cylindrical structure 11. It should be noted that the repair material here is a repair material for the furnace slope of the electric arc furnace, which has the characteristics of insulation, high temperature resistance, etc., and it can be understood that the material forming the furnace slope around the electrode 24 is also called ramming material, and the repair material and the ramming material can be the same material; wherein, according to the degree of damage to the furnace slope, the amount of repair material to be filled is set. After filling a certain amount of repair material, the repair material is baked so that the repair material can be shaped. The part of the repair material around the cylindrical structure 11 will form a furnace slope, and the surface of the hot repair material facing the center of the furnace chamber 22 forms the slope surface of the furnace slope. At the same time, under high-temperature baking, the hot repair frame 1 will also melt and adhere to the slope surface of the furnace slope, and a protective layer can be formed on the slope surface of the furnace slope.In the above-mentioned method for hot repairing the furnace slope of an electric arc furnace, since the cylindrical structure 11 stands in the vertical direction and the general direction of the cylindrical wall is in the vertical direction, the inclination angle of the cylindrical wall of the cylindrical structure 11 is roughly the same as the inclination angle of the slope of the repaired furnace slope 23. Therefore, the slope of the furnace slope 23 after repair by the method in this embodiment can form a larger slope. Compared with the furnace slope repaired by direct sprinkling in the current prior art, the slope of the repaired furnace slope 23 formed in this embodiment can be greatly increased and can be very close to the slope of the original furnace slope (the slope of the original furnace slope can be understood as the slope of the furnace slope of a new electric arc furnace that has not been used, or the slope of the furnace slope of the electric arc furnace that has never been corroded). This makes the repaired furnace slope 23 have a better shape, avoids affecting the local flow field in the furnace during smelting, slows down the local erosion of the furnace body, and can increase the number of times the electric arc furnace is used after each repair, thereby increasing the overall furnace life. Add 10% to 50%, effectively extend the service life of the furnace body, and thus can reduce the operating cost of the electric arc furnace. The thickness of the furnace slope will also increase by 20% to 50% when changing the furnace, which greatly reduces the safety hazards. Moreover, since the cylindrical structure forms a barrier wall structure with a blocking function, there is a hot repair frame around the electrode when filling the repair material into the furnace, and no repair material extends into the area where the electrode is located, which will not affect the conductivity of the electrode, will not affect the formation of the arc, and the normal working performance of the furnace bottom electrode. A filling space is formed between the cylindrical structure and the eroded furnace slope, so that the filling of the repair material has targeted positioning. The repair material can be filled between the cylindrical structure and the eroded furnace slope. There will be no excessive spillage of repair material, which can avoid waste of repair material and save repair material. Compared with the repair method of the prior art, the method of this embodiment can save 1 ton to 3 tons of repair material each time the hot repair is carried out, effectively reducing the repair cost.

[0044] In practice, baking the repair material may include adding a predetermined smelting material into the furnace 22 and starting the electric arc furnace to bake the repair material. Baking directly utilizes the smelting function of the electric arc furnace itself. By adding a predetermined amount of smelting material into the furnace 22 as arc starting material, power is supplied to the arc, and the repair material is baked after the electric arc furnace operates for a period of time. This is a simple and reliable method.

[0045] Specifically, in the aforementioned hot repair method for an electric arc furnace, the repair material is baked at a temperature of 1400°C to 1600°C. The baking time is controlled to be 30 to 60 minutes. The baking temperature and baking time can be selected based on the amount of repair material filled in the furnace 22 to ensure that the repair material is properly shaped.

[0046] Preferably, if Figure 3As shown, with respect to the height setting of the heat repair frame 1 in the extension direction of the axis, when the heat repair frame 1 is placed at the bottom of the furnace 22, in the direction perpendicular to the bottom surface of the furnace 22, the height of the tubular structure 11 is lower than the preset limit line of the molten steel level in the furnace 22. For example, the end surface of the top end of the tubular structure 11 can be set flush with the top surface of the furnace slope formed around it before it is corroded, or the end surface of the top end of the tubular structure 11 can be higher than the top surface of the furnace slope formed around it before it is corroded, so as to better block the repair material from entering the electrode 24 and help form a furnace slope with a better shape.

[0047] More specifically, if Figure 4 As shown, the slope α of the furnace slope after the repair material is shaped is greater than 45° and less than 90°. The slope α of the furnace slope after the repair material is shaped is the angle between the inner wall surface of the repair material facing the center of the furnace 22 and the bottom surface of the furnace 22. Preferably, the slope of the furnace slope after the repair material is shaped is greater than or equal to 60° and less than 90°. For example, the slope of the furnace slope after the repair material is shaped can be 65°, 70°, 75°, 80°, or 85°. This can form a furnace slope with a good slope, which is conducive to smelting work.

[0048] Based on the same utility model concept, reference Figure 3 ,like Figure 5As shown, this embodiment also provides a thermal repair frame 1 for thermal repair of the furnace slope of an electric arc furnace, which is applied to any of the furnace slope thermal repair methods of an electric arc furnace provided in the above embodiments. The thermal repair frame 1 specifically includes: a cylindrical structure 11 and at least two hangers 13. The inner hole of the cylindrical structure 11 is used to be opposite to the electrode 24 at the furnace bottom in the furnace chamber 22 of the electric arc furnace, and the cylinder wall of the cylindrical structure 11 is used to surround the outer peripheral side of the electrode 24. The material of the cylindrical structure 11 is steel; one end of each hanger 13 is connected to the cylinder wall of the cylindrical structure 11, and the other end of each hanger 13 is connected. The material of the hanger 13 is steel, and the hanger 13 can facilitate the hooking of the cylindrical structure 11. When performing hot repair, the hot repair frame 1 can be lifted by hooking the lifting rod 13 with the hook of the crane, and then moved into the furnace 22, and the hot repair frame 1 can be moved downward along the center of the furnace 22 and placed, and some auxiliary frame components can be used to align the hot repair frame 1 with the center of the furnace 22 to maintain balance, so that the hot repair frame 1 can be stably placed in the center of the furnace 22 and surrounded by the outer periphery of the bottom electrode 24. When the hot repair frame 1 is placed in the furnace 22, the cylindrical structure 11 stands in the vertical direction, and the general direction of the cylindrical wall is in the vertical direction. The inclination angle of the cylindrical wall of the cylindrical structure 11 is roughly the same as the inclination angle of the slope of the repaired furnace slope. Therefore, the slope of the furnace slope repaired by the hot repair frame in this embodiment can form a larger slope. Compared with the furnace slope repaired by direct throwing in the existing technology, the slope of the furnace slope formed by the hot repair frame in this embodiment can be The slope of the furnace slope is greatly improved and can be very close to the original slope. The number of times the electric arc furnace is used after each repair is increased, and the overall furnace life is increased by 10% to 50%. The thickness of the furnace slope will also increase by 20% to 50% when the furnace is replaced, which greatly reduces safety hazards. In addition, since the cylindrical structure forms a barrier wall structure with a blocking function, when filling the furnace with repair material, there is a hot repair frame around the electrode, and no repair material extends into the area where the electrode is located, which will not affect the conductivity of the electrode, the formation of the arc, and the normal working performance of the furnace bottom electrode. A filling space is formed between the cylindrical structure and the eroded furnace slope, so that the filling of the repair material has targeted positioning, and the repair material can be filled between the cylindrical structure and the eroded furnace slope. There will be no excessive spillage of repair material, which can avoid waste of repair material, save repair material, and effectively reduce the repair cost.

[0049] In one possible implementation, Figure 5As shown, a plurality of support rods 12 are provided on the inner side of the wall of the cylindrical structure 11. The support rods 12 are used to support the wall of the cylindrical structure 11. In the circumferential direction around the axis of the cylindrical structure 11, at least some of the support rods 12 are distributed end to end along the inner side of the wall of the cylindrical structure 11. Both ends of each support rod 12 are connected to the inner side of the wall of the cylindrical structure 11. The support rods 12 are made of steel. The support rods 12 can well support the wall of the cylindrical structure 11, thereby reducing the deformation of the wall when filling the repair material, allowing the wall of the cylindrical structure to maintain its own shape, which is conducive to forming a better furnace slope. The difference between the slope of the furnace slope after repair and the slope of the wall of the thermal repair frame 1 before repair will not be too large, so that the slope after repair is as close to the furnace slope as possible to the originally set slope.

[0050] Specifically, refer to Figure 5 As shown, the support rods 12 that are connected end to end along the inner side of the wall of the cylindrical structure 11 are approximately perpendicular to the axis of the cylindrical structure 11. In the cross section of the same radial direction of the cylindrical structure 11, multiple support rods 12 are connected end to end in sequence to form an annular support structure, which enhances the support capacity, can better support the wall of the cylindrical structure 11, and reduce the degree of deformation of the cylindrical wall. Preferably, there are at least two of the annular support structures in the extension direction of the axis of the cylindrical structure 11, and in the two adjacent annular support structures, the two adjacent support rods 12 in the extension direction of the axis of the cylindrical structure 11 are staggered, so that the connection points of the two support rods 12 in the upper and lower annular support structures are staggered, which can provide more stable support for the wall of the cylindrical structure 11.

[0051] More specifically, refer to Figure 3 、 Figure 5 As shown, when the heat repair rack 1 is placed at the bottom of the furnace 22, the orthographic projection of the support rod 12 on the furnace bottom does not overlap with the middle of the area where the electrode 24 is located, and the support rod 12 is only arranged along the wall of the cylindrical structure 11. The support rod 12 is only arranged at the outer edge of the inner hole of the cylindrical structure 11 and will not extend to the middle of the inner hole of the cylindrical structure 11, so that the orthographic projection of the support rod 12 on the furnace bottom is only at the outer edge of the area where the electrode 24 is located, or even the orthographic projection of the support rod 12 on the furnace bottom does not overlap with the area where the electrode 24 is located, so as to avoid affecting the uneven placement of the arc starting material when baking the repair material, and avoid affecting the arc starting and power supply of the electrode.

[0052] In addition, reference Figure 3 and Figure 6As shown, the shape of the tubular structure 11 can be cylindrical; or, the tubular structure 11 can be a truncated cone-shaped tubular structure, which is tapered and has a first end and a second end opposite to each other, with the diameter of the first end being smaller than the diameter of the second end, and the first end being used to connect with the bottom of the furnace chamber 22 of the electric arc furnace. The shape of the furnace slope can be set according to the shape of the cylindrical wall of the tubular structure 11, which is stable and reliable, and can obtain a better furnace slope shape.

[0053] Preferably, if Figure 6 As shown, when the cylindrical structure 11 is a truncated cone-shaped cylindrical structure, the angle β between the outer wall surface of the cylindrical wall of the cylindrical structure 11 and the end face of the first end toward the outside is greater than 45° and less than 90°. More preferably, the angle between the outer wall surface of the cylindrical wall of the cylindrical structure 11 and the end face of the first end toward the outside can be greater than or equal to 60° and less than 90°. Exemplarily, the angle between the outer wall surface of the cylindrical wall of the cylindrical structure 11 and the end face of the first end toward the outside is 65°, 70°, 75°, 80° or 85°, so as to obtain a better slope of the furnace slope after repair.

[0054] In one possible implementation, Figure 5 As shown, the heat repair frame 1 can be provided with three hangers 13, the three hangers 13 intersecting at the same point, the three hangers 13 connected at the intersection, and the connection points of the three hangers 13 with the tubular structure 11 are evenly spaced around the circumference of the tubular structure 11; or, the heat repair frame can be provided with four hangers 13, the four hangers 13 intersecting at the same point, the four hangers 13 connected at the intersection, and the connection points of the four hangers 13 with the tubular structure 11 are evenly spaced around the circumference of the tubular structure 11. Multiple hangers distributed around the circumference of the tubular structure can be stably connected to the tubular structure, allowing for more stable lifting of the heat repair frame and improving stability when the heat repair frame is moved.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A thermal repair rack for thermal repair of an electric arc furnace, characterized in that: include: A cylindrical structure, wherein the inner hole of the cylindrical structure is used to face the electrode at the furnace bottom in the furnace of the electric arc furnace, and the cylindrical wall of the cylindrical structure is used to surround the outer circumference of the electrode, and the material of the cylindrical structure is steel; at least two suspension rods, one end of each suspension rod being connected to the cylindrical wall of the cylindrical structure, and the other ends of each suspension rod being connected, and the suspension rods being made of steel; The tubular structure is a cylindrical tubular structure; or, the tubular structure is a truncated cone-shaped tubular structure, and the tubular structure has a first end and a second end opposite to each other, the diameter of the first end is smaller than the diameter of the second end, the first end is used to connect with the bottom of the furnace of the electric arc furnace, and the angle between the outer wall surface of the tubular wall of the tubular structure and the end surface of the first end toward the outside is greater than 60° and less than 90°; A plurality of support rods are connected to the inner side of the cylindrical wall of the cylindrical structure, and the support rods are used to support the cylindrical wall of the cylindrical structure. In the circumferential direction around the axis of the cylindrical structure, at least some of the support rods are distributed end to end along the inner side of the cylindrical wall of the cylindrical structure, and both ends of each support rod are connected to the inner side of the cylindrical wall of the cylindrical structure; the support rods are made of steel; The support rods are distributed end to end along the inner side of the cylindrical wall of the cylindrical structure and are substantially perpendicular to the axis of the cylindrical structure; A plurality of support rods are sequentially connected end to end along the inner side of the cylindrical wall of the cylindrical structure to form an annular support structure, and at least two annular support structures are provided on the inner side of the cylindrical wall along the extension direction of the axis of the cylindrical structure; When the tubular structure is placed in the furnace of the electric arc furnace, in the direction perpendicular to the bottom surface of the furnace of the electric arc furnace, the end surface of the top end of the tubular structure is lower than the preset limit line of the molten steel level in the furnace of the electric arc furnace, and the end surface of the top end of the tubular structure is flush with the top surface of the surrounding furnace slope before erosion, or, the end surface of the top end of the tubular structure is higher than the top surface of the surrounding furnace slope before erosion.

2. The thermal repair rack for thermal repair of the furnace slope of an electric arc furnace according to claim 1, characterized in that: In two adjacent annular support structures, the two adjacent support rods are staggered in the extending direction of the axial center line of the cylindrical structure.

3. The thermal repair rack for thermal repair of the furnace slope of an electric arc furnace according to claim 1, characterized in that: The three suspenders include three suspenders, the three suspenders intersect at the same point, and the three suspenders are connected at the intersection; or, The four suspension rods are intersected at the same point, and the four suspension rods are connected at the intersecting positions.

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