LF furnace steelmaking closed-loop arc sealing equipment

Abstract

The utility model discloses an LF furnace steelmaking closed-loop arc sealing device which comprises an LF furnace structure, a port support is arranged at the lower port of an air blowing brick opening in the LF furnace structure and connected with a pull rod, the pull rod is inserted into a spring pipe provided with an air pressure spring in a sliding mode, the spring pipe is fixed to the top corner position of the upper portion inside a bamboo-hat-shaped shade, and an inclined blowing hole is formed in the lower frame of the side face of the shade. Initially, the shade is hermetically inserted into a blowing hole slot of the furnace body, and the surface of the shade is also annularly provided with spacing-adjustable constraint claws along the axis; in the steelmaking process, argon is blown out from the blowing brick opening, the shade is pushed to move upwards, the inclined blowing hole moves out of the blowing hole inserting groove, communication between the furnace body and the interior of the shade is achieved, argon is rotationally blown into the furnace body, molten steel is driven to be stirred, the purity of the molten steel is improved, meanwhile, the blowing brick opening is prevented from being corroded and blocked by the molten steel and furnace slag, the equipment maintenance cost is reduced, and the downtime is shortened. The shade moves upwards to push the restraining claw to position and restrain the lower end of the electrode, and the influence of molten steel flow on the electrode is reduced.

Description

Technical Field

[0001] This utility model relates to the field of steelmaking process technology, specifically to a closed-loop arc sealing device for LF furnace steelmaking. Background Technology

[0002] The closed-loop arc sealing equipment for LF furnace steelmaking emerged in response to the continuous development of steel production technology. As a major ladle refining equipment in steel production, the LF furnace, since its development in the early 1970s, has been widely used in the global steel industry due to its advantages such as simple equipment, low investment cost, flexible operation, and good refining effect. However, traditional electric arc heating methods in LF furnace steelmaking have some problems, such as heat loss and increased electrode wear due to the arc being exposed to air, and the molten steel absorbing harmful gases from the air, affecting steel quality. To solve these problems and improve the heating efficiency and steel quality of the LF furnace, the closed-loop arc sealing equipment has gradually developed. This equipment optimizes the design of components such as the furnace cover and electrodes of the LF furnace, adopts a sealed structure and special control technology, and achieves closed-loop arc heating, effectively reducing heat loss and the absorption of harmful gases. This provides a more stable and efficient production environment for LF furnace steelmaking, helping to improve the quality and production efficiency of steel products and reduce production costs.

[0003] However, in the current LF furnace steelmaking closed-loop sealing arc equipment, the argon blowing port at the bottom is easily corroded and blocked by molten steel and slag during the refining process, resulting in poor or uneven argon blowing, affecting the formation of foam slag and the stirring effect of molten steel. Once the argon blowing system malfunctions, it needs to be cleaned and maintained in time, which increases the equipment maintenance cost and downtime.

[0004] To address these issues, this invention provides a closed-loop arc sealing device for LF furnace steelmaking. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a closed-loop arc sealing device for LF furnace steelmaking, which solves the aforementioned problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a closed-loop arc sealing device for LF furnace steelmaking, comprising an LF furnace structure, wherein the LF furnace structure includes an air blowing brick inlet, a port support is fixedly installed at the lower port of the air blowing brick inlet, and a pull rod is fixedly installed on the upper surface of the central circular plate of the port support, the upper end of the pull rod is slidably inserted into the interior of a spring tube, the upper end of the spring tube is fixed at the top corner position above the interior of the shield, and the surface of the shield is fixedly provided with constraint claws along the axis in a ring according to the number and position of the electrodes.

[0007] Preferably, the LF furnace structure further includes a furnace body, which consists of a transfer car body and a steelmaking furnace, wherein the air blowing brick opening is located inside the air blowing brick at the center of the lower surface inside the steelmaking furnace.

[0008] Preferably, a pneumatic spring is fixedly installed inside the upper part of the spring tube, and the lower end of the pneumatic spring is fixed to the upper end of the pull rod.

[0009] Preferably, the shield is in the shape of a conical hat, and the lower edge of the side is provided with inclined blowholes that are arranged in a circular array along the axis.

[0010] Preferably, the upper end of the pull rod has an extended end, and the extended end is slidably inserted into the upper middle position inside the spring tube.

[0011] Preferably, initially, the inclined blowholes of the shield are all sealed and inserted into the blowhole slots arranged in a ring along the axis on the lower surface inside the furnace body.

[0012] Preferably, the constraint claw consists of an upwardly bent L-shaped rod and a claw body with three claw bars, wherein the spacing between the claw bars is adjusted according to the path or radius of the electrode.

[0013] Beneficial effects

[0014] This invention provides a closed-loop arc sealing device for LF furnace steelmaking. Compared with the prior art, it has the following advantages:

[0015] (1) The closed-loop arc sealing equipment for steelmaking in this LF furnace is equipped with a port support, connecting rod, air pressure spring, spring tube, shield, inclined blowing hole and blowing hole slot at the blowing brick opening. During steelmaking, argon gas is blown into the blowing brick opening, which causes the air pressure to push the shield upward and move the inclined blowing hole out of the blowing hole slot, so that the furnace body and the inside of the shield are connected. This design prevents the blowing brick opening from being directly connected to the inside of the furnace body, reduces the erosion and blockage of molten steel and slag, reduces equipment maintenance costs, reduces downtime, ensures stable operation of the argon blowing system, ensures normal formation of foam slag and stirring effect of molten steel, and improves the quality of molten steel.

[0016] (2) The closed-loop arc sealing device for steelmaking in the LF furnace has a constraint claw set in a ring along the axis on the surface of the shield. When the shield moves upward due to the argon gas pressure, it pushes the constraint claw upward to position and constrain the lower end of the electrode inserted into the furnace body. In this way, the influence of molten steel flow on the electrode is effectively reduced, the stability of the electrode during steelmaking is ensured, the arc heating is more stable, the heating efficiency is improved, the electrode wear is reduced, the quality of molten steel and production efficiency are improved, and the production cost is reduced. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural perspective view of this utility model;

[0018] Figure 2 This is the structural cross-section of this utility model. Figure 1 ;

[0019] Figure 3 This is the structural cross-section of this utility model. Figure 2 and enlarged details;

[0020] Figure 4 This is a schematic diagram of the shield and its connection structure of this utility model.

[0021] In the diagram: 1. LF furnace structure; 11. Furnace body; 111. Air blowing brick inlet; 112. Port support; 113. Blowing hole slot; 12. Cover; 121. Inclined blow hole; 122. Bourdon tube; 123. Gas spring; 124. Tie rod; 125. Constraint claw. Detailed Implementation

[0022] 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.

[0023] Please see Figures 1-4 A closed-loop arc sealing device for LF furnace steelmaking includes an LF furnace structure 1. The furnace body 11 consists of a transfer car body and a steelmaking furnace. An air-blowing brick inlet 111 is provided in the air-blowing brick at the center of the lower surface of the steelmaking furnace. A port bracket 112 is fixedly installed at the lower end of the air-blowing brick inlet 111. A pull rod 124 is fixedly installed on the upper surface of the central circular plate of the port bracket 112. The upper end of the pull rod 124 has an extended end, which is slidably inserted into the upper middle position inside a spring tube 122 and constrained by the sliding distance of the sliding space inside the spring tube 122. A pneumatic spring 123 is fixedly installed at the upper part inside the spring tube 122, and the lower end of the pneumatic spring 123 is connected to the pull rod 124. The upper end is fixed, and the upper end of the spring tube 122 is fixed at the top corner of the inside of the cover 12. The cover 12 is hat-shaped, and the lower edge of the side is provided with inclined blow holes 121 in a circular array along the axis. Initially, the inclined blow holes 121 of the cover 12 are sealed and inserted into the blow hole slots 113 in the circular array along the axis on the lower surface of the furnace body 11. On the surface of the cover 12, above the inclined blow holes 121, a constraint claw 125 is fixedly provided along the axis according to the number and position of the electrodes. The constraint claw 125 consists of an upwardly bent L-shaped rod and a claw body with three claw rods. The spacing of the claw rods is adjusted according to the path or radius of the electrode.

[0024] When the LF furnace structure 1 is in place, the furnace body 11 is transported to the designated position by the transfer vehicle. Initially, the inclined blowhole 121 of the shield 12 is sealed and inserted into the blowhole slot 113 on the lower surface of the furnace body 11, forming a preliminary seal. During steelmaking, electrodes are inserted into the furnace body 11 to heat the molten metal, while argon gas is blown upward from the blowhole 111. Under the action of argon gas pressure, the shield 12 moves upward against the elastic force of the gas spring 123, and the inclined blowhole 121 moves out of the blowhole slot 113. The furnace body 11 then connects with the blowhole 111. The shield 12 is internally connected, and argon gas is blown into the furnace body 11 along an inclined path, causing the molten metal to rotate, promoting the stirring of the molten steel, uniformizing the composition and temperature, helping inclusions to float, and improving the purity of the molten steel. This structure can protect the blowing brick opening 111, preventing it from directly connecting with the inside of the furnace body 11, reducing the erosion and blockage of molten steel and slag. In addition, the upward-moving shield 12 pushes the constraint claw 125 to move upward, positioning and constraining the lower end of the electrode, reducing the impact of molten steel flow on the electrode, and ensuring the stability of the electrode during steelmaking.

[0025] In summary, by installing a port bracket 112, connecting rod 124, air pressure spring 123, spring tube 122, shield 12, inclined blowhole 121, and blowhole slot 113 at the blowhole 111, argon gas is blown into the blowhole 111 during steelmaking. This causes the air pressure to push the shield 12 upward and move the inclined blowhole 121 out of the blowhole slot 113, thus achieving communication between the furnace body 11 and the interior of the shield 12. This design prevents the blowhole 111 from directly communicating with the interior of the furnace body 11, reducing the erosion and blockage of molten steel and slag, lowering equipment maintenance costs, and reducing... During downtime, ensure the stable operation of the argon blowing system, guarantee the normal formation of foam slag and the stirring effect of molten steel, and improve the quality of molten steel. By setting constraint claws 125 in a ring along the axis on the surface of the shield 12, when the shield 12 moves upward due to argon gas pressure, it pushes the constraint claws 125 upward to position and constrain the lower end of the electrode inserted into the furnace body 11. In this way, the influence of molten steel flow on the electrode is effectively reduced, ensuring the stability of the electrode during steelmaking, making the arc heating more stable, improving heating efficiency, reducing electrode wear, improving the quality of molten steel and production efficiency, and reducing production costs.

[0026] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0027] Working principle: First, the LF furnace structure 1 is prepared and positioned. The furnace body 11 is transported to the designated location by a transfer vehicle. In the initial state, the inclined blowhole 121 of the shield 12 is sealed and inserted into the blowhole slot 113 on the lower surface of the furnace body 11, forming a preliminary seal. During steelmaking operations, electrodes are inserted into the interior of the furnace body 11 to heat the molten metal. At the same time, argon gas is blown upward through the blowhole 111. Under the pressure of the argon gas, the shield 12 moves upward. Since the shield 12 is connected to the pull rod 124 through the spring tube 122 and the gas spring 123, and the pull rod 124 is fixed to the port bracket 112, the shield 12 moves upward against the elastic force of the gas spring 123 under the pressure of the argon gas, causing the inclined blowhole 121 to move out of the blowhole slot 113. At this time, the furnace body 11 will be connected to the interior of the shield 12 through the air blowing brick 111. Argon gas will be blown into the interior of the furnace body 11 through the air blowing brick 111 along an inclined path, causing the molten metal inside the furnace body 11 to rotate, promoting the stirring of the molten steel, uniformizing the composition and temperature of the molten steel, and also helping to float inclusions and improve the purity of the molten steel. This structural design can protect the air blowing brick 111, preventing the air blowing brick 111 from being directly connected to the interior of the furnace body 11, reducing the erosion and blockage of the air blowing brick 111 by molten steel and slag. At the same time, the upward-moving shield 12 will push the constraint claw 125 upward, so that the constraint claw 125 positions and constrains the lower end of the electrode, reducing the impact of the flow of molten steel on the electrode during the steelmaking process and ensuring the stability of the electrode during the steelmaking process.

[0028] It should be noted that the closed-loop arc sealing equipment for LF furnace steelmaking mainly consists of an electrode heating system, LF furnace structure 1, water-cooled furnace cover, and sealing device. The electrode heating system uses three graphite electrodes powered by a transformer. During heating, the electrodes are inserted into the slag layer for submerged arc heating. The water-cooled furnace cover is equipped with alloy and slag feeding ports, as well as temperature measuring and sampling devices. Some also have a vacuum furnace cover. It is suspended from a gantry frame by an adjustable chain hook, and its position can be adjusted by a lifting mechanism. The sealing device includes a water-cooled flange at the top of the ladle and a sealing rubber ring to ensure the sealing effect inside the furnace.

[0029] 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 process, method, article, or apparatus.

[0030] 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. A closed-loop arc sealing device for LF furnace steelmaking, comprising an LF furnace structure (1), wherein the LF furnace structure (1) includes an air blowing brick inlet (111), characterized in that: A port bracket (112) is fixedly installed at the lower port of the air blowing brick (111), and a pull rod (124) is fixedly installed on the upper surface of the central circular plate of the port bracket (112). The upper end of the pull rod (124) is slidably inserted into the inside of the spring tube (122). The upper end of the spring tube (122) is fixed at the top corner position inside the shield (12). The surface of the shield (12) is fixedly provided with constraint claws (125) along the axis according to the number and position of the electrodes.

2. The closed-loop arc sealing device for LF furnace steelmaking according to claim 1, characterized in that: The LF furnace structure (1) also includes a furnace body (11), which is composed of a transfer car body and a steelmaking furnace, wherein the air blowing brick opening (111) is opened in the air blowing brick at the center of the lower surface inside the steelmaking furnace.

3. The closed-loop arc sealing device for LF furnace steelmaking according to claim 1, characterized in that: A pneumatic spring (123) is fixedly installed inside the upper part of the spring tube (122), and the lower end of the pneumatic spring (123) is fixed to the upper end of the pull rod (124).

4. The closed-loop arc sealing device for LF furnace steelmaking according to claim 1, characterized in that: The shield (12) is shaped like a conical hat, and the lower edge of the side is provided with inclined blowholes (121) arranged in a circular array along the axis.

5. The closed-loop arc sealing device for LF furnace steelmaking according to claim 1, characterized in that: The upper end of the pull rod (124) has an extended end, and the extended end is slidably inserted into the upper middle position inside the spring tube (122).

6. The closed-loop arc sealing device for LF furnace steelmaking according to claim 1, characterized in that: Initially, the inclined blowholes (121) of the shield (12) are all sealed and inserted into the blowhole slots (113) arranged in a ring along the axis on the lower surface of the furnace body (11).

7. The closed-loop arc sealing device for LF furnace steelmaking according to claim 1, characterized in that: The constraint claw (125) consists of an upwardly bent L-shaped rod and a claw body with three claw bars, wherein the spacing between the claw bars is adjusted according to the path or radius of the electrode.

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