Improved structure of furnace cover of intermediate frequency furnace in steel plant

Abstract

The utility model relates to the technical field of steelmaking, and discloses an improved structure of a furnace cover of an intermediate frequency furnace in a steel plant, which comprises a furnace body, a flange arranged on the outer side and a furnace cover body arranged on the top, the sealing assembly is arranged at the bottom of the furnace cover body and comprises a first sealing ring fixedly connected to the bottom of the furnace cover body, an induction coil is arranged in the furnace body, a mica base plate is arranged at the top of the induction coil, and a first asbestos fiber plate is arranged at the top of the mica base plate; a second asbestos fiber board is arranged at the top of the first asbestos fiber board; by arranging the sealing assembly, the connecting structure of the furnace cover body and the induction coil is optimized, the stability and the sealing performance of the furnace cover body are improved, the service life of the furnace cover body is prolonged, the damage influence of steel leakage on equipment is reduced, the influence on production is reduced, the maintenance cost of the equipment is reduced, and therefore the production efficiency and the economic benefits of a steel plant are improved.

Description

An improved structure for the furnace cover of an intermediate frequency furnace in a steel plant. Technical Field

[0001] This utility model relates to the field of steelmaking technology, specifically to an improved structure for the furnace cover of an intermediate frequency furnace in a steelmaking plant. Background Technology

[0002] Steelmaking refers to controlling carbon content, eliminating harmful elements such as P, S, O, and N, retaining or increasing beneficial elements such as Si, Mn, Ni, and Cr, and adjusting the proportions between these elements to obtain optimal performance. Pig iron for steelmaking is placed in a steelmaking furnace and smelted according to a specific process to obtain steel. Steel products include steel ingots, continuously cast billets, and various steel castings directly cast. Generally speaking, steel refers to steel rolled into various steel products. Steel belongs to the ferrous metals category, but steel is not entirely synonymous with ferrous metals. In the steelmaking process, the intermediate frequency furnace is a crucial smelting equipment; the stability and durability of its furnace lid structure are vital to production efficiency and equipment safety.

[0003] Traditional intermediate frequency furnace covers consist of a steel shell on top and cast refractory material on the bottom. The structural design of the contact area between the refractory material and the induction coil is relatively simple, relying solely on a water-cooled ring around the induction coil and 14 bakelite columns for support. In actual production, the forklifts generating significant impact when feeding the furnace directly strike the cover. Simultaneously, the induction coil expands upwards due to heat during operation, and the hydraulic cylinder pushes out the refractory material during furnace dismantling, causing further pressure and stress on the cover. These factors result in extremely short lifespans for new covers; typically, a new cover will fail after less than 100 heats, or molten steel will leak from the connection between the induction coil and the cover. This not only severely disrupts the normal production order of the steel plant, with frequent shutdowns and cover replacements increasing production costs, but also damages equipment due to molten steel leakage, further increasing maintenance costs and difficulty, leading to significant economic losses for the company. Summary of the Invention

[0004] The purpose of this invention is to provide an improved structure for the furnace cover of an intermediate frequency furnace in a steelmaking plant, so as to solve the problems of easy damage and steel leakage in the existing intermediate frequency furnace cover.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an improved structure for the furnace cover of a medium-frequency furnace in a steelmaking plant, comprising a furnace body, and further comprising:

[0006] The flange is located on the outside, and the furnace cover body is located on the top.

[0007] A sealing assembly is provided at the bottom of the furnace cover body. The sealing assembly includes a first sealing ring fixedly connected to the bottom of the furnace cover body. An induction coil is provided inside the furnace body. A mica pad is provided on the top of the induction coil. A first asbestos fiber board is provided on the top of the mica pad. A second asbestos fiber board is provided on the top of the first asbestos fiber board.

[0008] Preferably, a sealing ring is provided on the outer side of the furnace body, and the outer side of the sealing ring is slidably connected to the inner wall of the first sealing ring.

[0009] Preferably, the furnace body has a first sealing groove inside and a second sealing groove inside.

[0010] Preferably, a second sealing ring is fixedly connected to the bottom of the furnace cover body, and the outer side of the second sealing ring is slidably connected to the inner wall of the first sealing groove.

[0011] Preferably, a third sealing ring is fixedly connected to the bottom of the furnace cover body, and the outer side of the third sealing ring is slidably connected to the inner wall of the second sealing groove.

[0012] Preferably, a contact ring is fixedly connected to the bottom of the furnace cover body, and four bolts are provided inside the furnace cover body.

[0013] Preferably, a positioning rod is fixedly connected to the bottom of the furnace cover body, a third sealing groove is provided inside the flange to cooperate with the first sealing ring, a screw hole is provided inside the flange, a positioning hole is provided inside the flange, and the inner wall of the positioning hole is slidably connected to the outer side of the positioning rod.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention utilizes a sealing assembly, in which a mica gasket possesses high temperature resistance and high strength. Simultaneously, the first and second asbestos fiber boards effectively fill minute gaps at the joint, enhancing the sealing and contact area of ​​this area and preventing molten steel leakage. Furthermore, the first and second asbestos fiber boards buffer the stress generated by the thermal expansion and contraction of the induction coil, as well as the impact force during charging, protecting the structural integrity of the furnace cover and induction coil. A flange, made of high-strength metal, is added, its dimensions matching the lower outer ring of the furnace cover. This flange increases the contact area between the induction coil and the furnace cover, connecting them as a whole and improving the overall structural stability, better resisting various external forces during production. Additionally, the first, second, and third sealing rings form a multi-layered sealing structure, further increasing the sealing between the furnace cover and the furnace body. Attached Figure Description

[0016] Figure 1 is a schematic diagram of a preferred embodiment of the improved structure of the induction furnace cover for a steel plant provided by this utility model;

[0017] Figure 2 is a schematic diagram of the sealing assembly structure provided by this utility model;

[0018] Figure 3 is a schematic diagram of the connection between the furnace cover body and the contact ring structure provided by this utility model;

[0019] Figure 4 is an enlarged schematic diagram of the structure at point A in Figure 2 provided by this utility model.

[0020] In the diagram: 1. Furnace body; 2. Flange; 3. Furnace cover body; 4. Sealing assembly; 41. First sealing ring; 42. Induction coil; 43. Mica gasket; 44. First asbestos fiberboard; 45. Second asbestos fiberboard; 5. Sealing ring; 6. First sealing groove; 7. Second sealing groove; 8. Second sealing ring; 9. Third sealing ring; 10. Contact ring; 11. Bolt; 12. Positioning rod; 13. Third sealing groove; 14. Screw hole; 15. Positioning hole. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please refer to Figures 1-4, which show an improved structure for the furnace cover of a medium-frequency furnace in a steel plant, including a furnace body 1, and further comprising:

[0023] The flange 2 located on the outside can make the connection between the furnace cover body 3 and the induction coil 42 tight under the action of the flange 2, and at the same time increase the contact area between the induction coil 42 and the furnace cover body 3. The furnace cover body 3 located on the top can seal the furnace body 1 under the action of the furnace cover body 3, thereby improving the sealing performance between the furnace body 1 and the furnace cover body 3.

[0024] The sealing assembly 4, located at the bottom of the furnace cover body 3, fills the tiny gap between the furnace cover body 3 and the induction coil 42, increasing their sealing performance. It also buffers the stress caused by the thermal expansion and contraction of the induction coil 42, as well as the impact force during material feeding, protecting the structural integrity of both the furnace cover body 3 and the induction coil 42. The sealing assembly 4 includes a first sealing ring 41 fixedly connected to the bottom of the furnace cover body 3. The first sealing ring 41 ensures a tight connection between the furnace cover body 3 and the flange 2. At the same time, a sealed structure is formed. An induction coil 42 is set inside the furnace body 1, and a mica pad 43 is set on the top of the induction coil 42. By setting the mica pad 43, the contact area between the furnace cover body 3 and the induction coil 42 can be increased. A first asbestos fiber board 44 is set on the top of the mica pad 43, and a second asbestos fiber board 45 is set on the top of the first asbestos fiber board 44. By setting the first asbestos fiber board 44 and the second asbestos fiber board 45, a buffer zone can be formed to reduce the impact force on the furnace cover body 3, thereby protecting the furnace cover body 3.

[0025] Referring to Figures 2 and 3, a sealing ring 5 is provided on the outer side of the furnace body 1. By providing the sealing ring 5, the first sealing ring 41 and the furnace body 1 can be sealed under the action of the sealing ring 5. The outer side of the sealing ring 5 is slidably connected to the inner wall of the first sealing ring 41.

[0026] The furnace body 1 has a first sealing groove 6 inside, which facilitates the placement and positioning of the second sealing ring 8 by the staff. The furnace body 1 also has a second sealing groove 7 inside, which facilitates the placement and positioning of the third sealing ring 9 by the staff.

[0027] A second sealing ring 8 is fixedly connected to the bottom of the furnace cover body 3. By setting the second sealing ring 8, a sealing structure can be formed under the action of the second sealing ring 8 and the first sealing groove 6, which improves the sealing performance between the furnace cover body 3 and the furnace body 1. The outer side of the second sealing ring 8 is slidably connected to the inner wall of the first sealing groove 6.

[0028] A third sealing ring 9 is fixedly connected to the bottom of the furnace cover body 3. By setting the third sealing ring 9 and the second sealing groove 7, a sealing structure can be formed under the action of the third sealing ring 9 and the second sealing groove 7, which further improves the sealing performance between the furnace cover body 3 and the furnace body 1. The outer side of the third sealing ring 9 is slidably connected to the inner wall of the second sealing groove 7.

[0029] Referring to Figures 2 and 4, a contact ring 10 is fixedly connected to the bottom of the furnace cover body 3. By setting the contact ring 10, after the furnace cover body 3 is placed in the designated position, the bottom of the contact ring 10 can be made to fit against the top of the second asbestos fiber board 45, thereby increasing the contact area between the bottom of the furnace cover body 3 and the induction coil 42 and preventing molten steel from flowing out. Bolts 11 are set inside the furnace cover body 3, and the number of bolts 11 is set to four.

[0030] A positioning rod 12 is fixedly connected to the bottom of the furnace cover body 3. By setting multiple positioning rods 12, it is convenient for the staff to install and place the furnace cover body 3. At the same time, the positioning rod 12 enters the positioning hole 15. The flange 2 has a third sealing groove 13 inside that cooperates with the first sealing ring 41. The flange 2 has a screw hole 14 inside. By setting the screw hole 14, the bolt 11 can enter the corresponding screw hole 14, thereby making the furnace cover body 3 and the flange 2 tightly connected. The flange 2 has a positioning hole 15 inside, and the inner wall of the positioning hole 15 is slidably connected to the outer side of the positioning rod 12.

[0031] Working Principle: When using this device, the operator first thoroughly cleans the joint between the induction coil 42 and the furnace cover body 3, removing impurities, debris, and oxide layers to ensure a clean and flat joint surface. Then, based on the shape and size of the joint, a suitable high-temperature resistant mica pad 43 is designed and selected. The processed mica pad 43, the first asbestos fiber board 44, and the second asbestos fiber board 45 are evenly filled into the joint. Professional tools are used to compact and fix the filling, ensuring its density and uniformity. After filling, it is flush with the surfaces of the furnace cover body 3 and the induction coil 42 to improve sealing. Then, the operator customizes a flange 2 of appropriate specifications according to the size of the outer ring of the furnace cover body 3 and welds it to the outer shell of the furnace body 1. At the same time, the positioning rod 12 enters the interior of the positioning hole 15, the first sealing ring 41 enters the interior of the third sealing groove 13, the second sealing ring 8 enters the interior of the first sealing groove 6, and the third sealing ring 9 enters the interior of the second sealing groove 7. Then, the operator tightens the bolts 11 according to the specified torque to ensure a firm and reliable connection. After installation, the flange 2 connection is inspected to ensure there is no looseness, thus solving the problem of easy damage to the furnace cover body 3. The lifespan of the furnace cover body 3 is increased, and the replacement frequency of the furnace cover body 3 is reduced, thereby lowering equipment purchase costs. Due to the significant extension of the lifespan of the furnace cover body 3, the production interruption time caused by the damage of the furnace cover body 3 is reduced, ensuring the continuity of steelmaking production and effectively improving production efficiency. At the same time, the sealing and stability of the joint between the furnace cover body 3 and the induction coil 42 are enhanced, effectively preventing steel leakage and reducing the risk of equipment damage caused by steel leakage. This reduces equipment maintenance costs and workload. By extending the lifespan of the furnace cover body 3, improving production efficiency, and reducing the risk of equipment damage, the economic benefits of the steelmaking plant are comprehensively improved, and the company's market competitiveness is enhanced.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An improved structure for the furnace cover of a medium-frequency furnace in a steelmaking plant, comprising a furnace body, characterized in that, Also includes: The flange is located on the outside, and the furnace cover body is located on the top. A sealing assembly is provided at the bottom of the furnace cover body. The sealing assembly includes a first sealing ring fixedly connected to the bottom of the furnace cover body. An induction coil is provided inside the furnace body. A mica pad is provided on the top of the induction coil. A first asbestos fiber board is provided on the top of the mica pad. A second asbestos fiber board is provided on the top of the first asbestos fiber board.

2. The improved structure of the furnace cover for a medium-frequency furnace in a steel plant according to claim 1, characterized in that: A sealing ring is provided on the outer side of the furnace body, and the outer side of the sealing ring is slidably connected to the inner wall of the first sealing ring.

3. The improved structure of the furnace cover for a medium-frequency furnace in a steel plant according to claim 1, characterized in that: The furnace body has a first sealing groove inside and a second sealing groove inside.

4. The improved structure of the furnace cover for a steelmaking plant's medium-frequency furnace according to claim 3, characterized in that: A second sealing ring is fixedly connected to the bottom of the furnace cover body, and the outer side of the second sealing ring is slidably connected to the inner wall of the first sealing groove.

5. The improved structure of a medium-frequency furnace cover for a steel plant according to claim 3, characterized in that: A third sealing ring is fixedly connected to the bottom of the furnace cover body, and the outer side of the third sealing ring is slidably connected to the inner wall of the second sealing groove.

6. The improved structure of the furnace cover for a medium-frequency furnace in a steel plant according to claim 1, characterized in that: A contact ring is fixedly connected to the bottom of the furnace cover body, and four bolts are installed inside the furnace cover body.

7. The improved structure of the furnace cover for a medium-frequency furnace in a steel plant according to claim 1, characterized in that: A positioning rod is fixedly connected to the bottom of the furnace cover body. A third sealing groove is opened inside the flange to cooperate with the first sealing ring. A screw hole is opened inside the flange. A positioning hole is opened inside the flange. The inner wall of the positioning hole is slidably connected to the outer side of the positioning rod.

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