Automatic feeding device for preventing oxidation in smelting of waste and old steel in electric furnace

Abstract

The utility model relates to electric furnace smelting technical field, specifically disclose the anti -oxidation automatic feeding device for waste steel electric furnace smelting, including feed channel, the feed channel is rectangular channel structure, and its one side is closed structure, the upper end of feed channel is equipped with feed inlet, the feed inlet is installed with feed hopper, the closed end center position of feed channel is fixed with bearing through -going, the inner ring wall of bearing is installed with threaded rod and is interference fit, through when feeding, material enters from the feed hopper of top, the channel itself can effectively reduce the flying dust and material splashing, and the core in the channel is a precision threaded rod pushing system driven by motor, after motor starts, threaded rod rotates, drives the threaded bushing with U type pushing seat to carry out the stable linear motion, and this pushing seat will be like bulldozer, and the waste steel of entering the channel will be pushed to the feeding port of electric furnace step by step.

Description

Technical Field

[0001] This utility model relates to the field of electric furnace smelting technology, and specifically discloses an automatic anti-oxidation feeding device for electric furnace smelting of scrap steel. Background Technology

[0002] In the modern steel recycling and regeneration industry, the smelting of scrap steel is a crucial step in resource recycling. Typically, scrap steel is remelted using smelting equipment such as electric arc furnaces to produce new steel billets or steel products. However, during the feeding process, the high-temperature scrap steel is highly susceptible to oxidation upon contact with air. This not only leads to metal loss and affects the quality of the molten steel, but also increases slag production, reducing smelting efficiency and economic benefits.

[0003] For example, the utility model patent with authorization announcement number CN202519288U discloses a safety protection device for electric furnace smelting, belonging to the field of metal smelting machinery and equipment. An automatic charging protective cover for an electric furnace includes a circular cover and a base. The front end of the circular cover has an inlet that cooperates with the vibrating feed port of a charging machine. A U-shaped protective baffle is fixedly installed on the edge of the inlet, and the other end of the U-shaped protective baffle is fixedly connected to the base. A handle is fixedly connected to the large circular cover and the base. The closed large circular cover completely prevents molten iron splashing inside the electric furnace from continuing to splash outwards, instead landing on the circular cover. The U-shaped baffle prevents the molten iron splashed from the inlet from escaping. A handle is welded to the large circular cover for easy manual lifting and transportation.

[0004] Currently, common scrap steel feeding methods mostly involve using overhead cranes to transport hoppers or conveyor belts for direct feeding. The feeding process is open and cannot effectively isolate air. Although some improved devices have simple covers, it is still difficult to form a stable inert gas protective atmosphere at the feeding port, and oxidation problems still exist. In addition, scrap materials easily accumulate in the feeding channel, which is inconvenient to clean. Long-term accumulation may affect the smoothness of feeding or even the normal operation of the equipment.

[0005] Therefore, it is necessary to design an anti-oxidation feeding device that can automatically and continuously form an inert gas protective layer during the feeding process, reliably push materials, and facilitate the cleaning of residues, in order to solve the above-mentioned technical problems. Summary of the Invention

[0006] In view of this, the purpose of this utility model is to provide an automatic anti-oxidation feeding device for electric furnace smelting of scrap steel, so as to solve the problem that the feeding process is open and cannot effectively isolate air.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an automatic anti-oxidation feeding device for electric furnace smelting of scrap steel, including a feeding channel, wherein the feeding channel is a rectangular channel structure with one side being a closed structure, and a feeding port is provided at the upper end of the feeding channel, and a feeding funnel is installed on the feeding port; A bearing is fixed through the center of the closed end of the feeding channel. A threaded rod is installed on the inner ring wall of the bearing with an interference fit. An anti-detachment plate is fixedly installed at one end of the threaded rod inside the feeding channel. Support seats are fixedly installed on both sides of the anti-detachment plate. The end face of the support seat is connected to the inner wall of the feeding channel through a support rod. The threaded rod has a threaded sleeve installed on its surface. Limiting rods are symmetrically installed on the outer ring wall of the threaded sleeve. A pusher seat is fixedly installed at the other end of the limiting rod. The pusher seat has a U-shaped structure. A pusher ramp is fixedly installed at one end of the support base near the opening of the feed channel; A motor is installed at the outer end of the threaded rod, and the outer ring wall of the motor is fixed to the outer wall of the feed channel by a bracket.

[0008] Preferably, the motor has an internal shaft for driving, and the end of the shaft is connected to a threaded rod via a coupling.

[0009] Preferably, a plurality of air nozzles are fixedly connected through the upper end of the opening of the feeding channel, and the upper ends of the plurality of air nozzles are connected to an air supply pipe.

[0010] Preferably, an extension plate is fixedly installed on the outer wall of the feeding channel, and an air pump is fixedly installed at the upper end of the extension plate, with the air outlet end of the air pump connected to the air delivery pipe flange.

[0011] Preferably, the air pump is equipped with a flow regulating valve at its air inlet.

[0012] Preferably, a waste outlet is provided at the lower position of the closed end of the feeding channel.

[0013] Preferably, a sealing plate is provided on the outer wall of the feeding channel, and the sealing plate covers the port position of the waste outlet.

[0014] Preferably, an inner sleeve is fixedly installed through both sides of the sealing plate, and a threaded post corresponding to the inner sleeve is fixedly installed on the outer wall of the feeding channel, and a threaded knob is threadedly installed at the end of the threaded post.

[0015] The working principle and beneficial effects of this solution are as follows: 1. When feeding, the material enters from the top feed hopper. The channel itself can effectively reduce dust and material splashing. The core of the channel is a precision threaded rod pushing system driven by a motor. After the motor starts, the threaded rod rotates, driving a threaded sleeve with a U-shaped pusher seat to move smoothly in a straight line. This pusher seat will push the scrap steel entering the channel step by step towards the feed port of the electric furnace, just like a bulldozer. The entire pushing process is very smooth, and the speed can be adjusted by the motor, thereby achieving precise control of the feeding rhythm and quantity, completely replacing the traditional manual or overhead crane tipping method. 2. Above the material outlet of the feeding channel, a row of special gas nozzles is installed. The gas nozzles are connected to an external inert gas supply device, such as a nitrogen or argon system. When the device feeds the electric furnace, the operator can simultaneously turn on the gas pump. The inert gas is evenly sprayed downwards from each gas nozzle through the gas delivery pipe. These sprayed gases form a continuous and stable air curtain barrier in front of the feeding port. This air curtain can isolate the furnace opening area from the outside air. When scrap steel is pushed out of the channel and falls into the electric furnace through this air curtain, its contact with oxygen in the air is minimized.

[0016] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0017] Figure 1 This is a frontal view of the embodiment; Figure 2 This is a top view of the overall embodiment; Figure 3 This is a schematic diagram of the overall rear side of the embodiment; Figure 4 This is a front view of the inside of the feed channel in an embodiment. Figure 5 This is a schematic diagram of the inner side of the feed channel in an embodiment; Figure 6 Examples Figure 5 Enlarged view of point A; Figure 7 Examples Figure 3 Enlarged diagram of point B.

[0018] The following are the markings in the attached diagram: 1. Feed channel; 11. Feed inlet; 12. Feed hopper; 13. Bearing; 14. Threaded rod; 110. Anti-detachment plate; 15. Support seat; 16. Support rod; 17. Limiting rod; 18. Threaded sleeve; 19. Pusher seat; 1001. Push ramp; 1002. Motor; 2. Air nozzle; 21. Air supply pipe; 22. Air pump; 23. Flow regulating valve; 24. Extension plate; 3. Waste outlet; 31. Sealing plate; 32. Internal sleeve; 33. Threaded column; 34. Threaded knob. Detailed Implementation

[0019] The following detailed description illustrates the specific implementation method: Example

[0020] like Figures 1 to 7 As shown, an automatic anti-oxidation feeding device for electric arc furnace smelting of scrap steel is disclosed, including a feeding channel 1. The feeding channel 1 has a rectangular channel structure with one side closed. A feeding port 11 is provided at the upper end of the feeding channel 1, and a feeding funnel 12 is installed on the feeding port 11. The feeding channel 1 is typically welded from high-temperature resistant and deformation-resistant steel plates. Its rectangular structure facilitates cooperation with the subsequent pushing mechanism, ensuring smooth material movement. One end of the closed structure is used to install the drive component, and the other end is the material outlet. The design of the feeding funnel 12 guides the scrap steel smoothly into the channel and reduces dust and material splashing during feeding. A bearing 13 is fixedly installed through the center of the closed end of the feed channel 1. A threaded rod 14 is interference-fitted onto the inner ring wall of the bearing 13. An anti-detachment plate 110 is fixedly installed at one end of the threaded rod 14 inside the feed channel 1. Support seats 15 are fixedly installed on both sides of the anti-detachment plate 110. The end face of the support seat 15 is connected to the inner wall of the feed channel 1 through a support rod 16. The bearing 13 is preferably a high-temperature bearing to ensure smooth operation even under the heat radiation of the smelting environment. The main function of the anti-detachment plate 110 is to prevent the threaded rod 14 from accidentally dislodging when rotating in the opposite direction. The support seat 15 and the support rod 16 form a stable triangular support frame. Its core function is to bear the axial thrust of the threaded rod 14 and ensure that the axis position of the threaded rod 14 is fixed, preventing it from bending or shifting due to force during operation, thereby ensuring transmission accuracy. A threaded sleeve 18 is threaded onto the surface of the threaded rod 14. Limiting rods 17 are symmetrically installed on the outer ring wall of the threaded sleeve 18. A pusher seat 19 is fixedly installed at the other end of the limiting rod 17. The pusher seat 19 has a U-shaped structure. The threaded sleeve 18 and the threaded rod 14 form a precision lead screw pair, which converts rotational motion into linear motion. Its core functions are: first, to prevent the threaded sleeve 18 from rotating with the threaded rod 14, forcing it to move only axially; and second, to balance the lateral force generated during the pushing process, ensuring that the pusher seat 19 moves smoothly. The U-shaped structure of the pusher seat 19 allows it to move across the support seat 15 below and the pusher ramp 1001, realizing the entire pushing process. A pusher ramp 1001 is fixedly installed at one end of the support base 15 near the opening of the feed channel 1. The pusher ramp 1001 is a gradually rising slope, which plays a crucial role. When the pusher base 19 pushes the scrap steel to the end of the channel, the ramp can smoothly lift the material and guide it to the edge of the outlet of the feed channel 1, so that the material falls into the electric furnace charging port at a better angle, reducing the situation of material jamming or scattering, and achieving smooth and directional feeding. A motor 1002 is installed at the outer end of the threaded rod 14. The outer ring wall of the motor 1002 is fixed to the outer wall of the feed channel 1 by a bracket. The motor 1002 is usually a variable frequency geared motor, which is convenient for precise control of the pushing speed and feeding rhythm. The coupling can be a flexible coupling to compensate for minor installation alignment errors and absorb some vibration. The motor is fixed by the bracket to ensure the stability of the power source. The entire drive system has a compact structure and direct and efficient power transmission.

[0021] The motor 1002 has an internal drive shaft, the end of which is connected to the threaded rod 14 via a coupling. Air nozzles 2 are evenly distributed along the upper edge of the feed channel 1 outlet, with their nozzles slightly tilted downwards, pointing towards the material outlet path. The air supply pipe 21 acts as a gas collection manifold, ensuring that inert gas is evenly distributed to each air nozzle. This is a key component in forming a localized gas protective curtain.

[0022] Among them, several air nozzles 2 are fixed through the upper end of the opening of the feed channel 1. The upper ends of the several air nozzles 2 are connected to the air supply pipe 21. The extension plate 24 installs the air pump 22 on the outside of the feed channel 1, which is convenient for maintenance and away from the high temperature area. The air pump 22 should actually be an inert gas supply device, such as a nitrogen or argon cylinder group and pressure reducing valve, or a centralized gas supply pipeline interface of the factory. The flange connection is reliable, easy to disassemble and repair, and ensures good sealing of the gas transmission pipeline.

[0023] An extension plate 24 is fixedly installed on the outer wall of the feeding channel 1. An air pump 22 is fixedly installed at the upper end of the extension plate 24. The air outlet of the air pump 22 is connected to the flange of the air supply pipe 21. The flow regulating valve 23 is used to precisely control the flow rate of the inert gas. The operator can flexibly adjust the concentration and coverage of the gas curtain according to the size of the electric furnace charging port, the negative pressure in the furnace and the required protection effect.

[0024] The air pump 22 is equipped with a flow regulating valve 23 at its air inlet end, and the scrap port 3 is located at the bottom of the channel. It is mainly used to clean up small slag, scale, dust, or accidentally dropped non-metallic debris generated during the conveying process. If these scraps enter the electric furnace, they will affect the quality of the molten steel. Regular cleaning through this port can keep the inside of the channel clean and prevent the accumulation of debris from obstructing the operation of the pushing mechanism.

[0025] Among them, a waste outlet 3 is opened at the lower part of the closed end of the feeding channel 1.

[0026] Among them, a sealing plate 31 is provided on the outer wall of the feeding channel 1. The sealing plate 31 covers the port position of the waste port 3. The sealing plate 31, the inner sleeve 32, the threaded column 33 and the threaded knob 34 together constitute a quick-opening and closing sealed cleaning door.

[0027] The sealing plate 31 has an inner sleeve 32 fixedly installed on both sides. The outer wall of the feeding channel 1 is fixedly installed with a threaded post 33 corresponding to the inner sleeve 32. The end of the threaded post 33 is threaded with a threaded knob 34. During normal feeding operation, tightening the threaded knob 34 will make the sealing plate 31 tightly close the waste port 3 to prevent gas leakage and heat loss. When cleaning is required, simply unscrew the threaded knob 34 to remove the sealing plate 31. The operation is simple and quick and easy to maintain.

[0028] In practice In this design, after the motor 1002 is started, its shaft drives the threaded rod 14 to rotate via a coupling. The threaded rod 14 is installed in the inner ring of the closed-end bearing 13 with an interference fit, ensuring the stability of the rotation axis. To prevent the threaded rod 14 from axially dislodging, an anti-dislodgement plate 110 is fixed at its end. The triangular frame formed by the support base 15 and the support rod 16 provides crucial axial support, preventing the threaded rod 14 from bending under force. The threaded sleeve 18, which is threadedly engaged with the threaded rod 14, has limit rods 17 symmetrically installed on its outer ring. The other end of the limit rod 17 is fixed with a U-shaped pusher seat 19. Because the limit rod 17 is constrained by the rectangular inner wall of the feed channel 1, the threaded rod... The sleeve 18 and the pusher seat 19 cannot rotate with the threaded rod 14, and can only be forced to move in a straight line along the axis of the threaded rod 14. When the scrap steel added from the feed hopper 12 accumulates in the feed channel 1, the rotating threaded rod 14 drives the threaded sleeve 18 to push the pusher seat 19 smoothly towards the opening end. The U-shaped pusher seat 19 can cross the support seat 15 below and the pusher ramp 1001 to continuously push the material towards the outlet. When the material reaches the end, it is smoothly lifted by the gradually rising ramp 1001 and guided to the edge of the outlet of the feed channel 1, so that it falls into the electric furnace charging port at a better angle, realizing an automatic and smooth feeding process. Several fixed air nozzles 2 are evenly inserted along the upper edge of the feed channel 1 opening. The upper ends of all air nozzles 2 are connected to a common air delivery pipe 21, forming a gas distribution manifold. The air source comes from an air pump 22 installed on an extension plate 24. In actual operation, the air pump 22 refers to an inert gas supply device, such as a nitrogen or argon cylinder group. After the gas pressure and flow rate are regulated by a flow regulating valve 23, it is sent into the air delivery pipe 21 through a flange-connected pipeline. The nozzles 2 are designed to be slightly tilted downwards, pointing directly at the path of the material falling from the channel outlet. When the system is started... When activated, the regulated inert gas is ejected from the nozzle 2, forming a continuous and uniform gas curtain in front of the outlet of the feed channel 1. This curtain can effectively isolate or dilute the surrounding air, creating a local low-oxygen environment for the material during the short period from leaving the channel to falling into the electric furnace, thereby significantly reducing the oxidation and burning loss on the surface of the material and improving the metal yield. The flow regulating valve 23 allows the operator to flexibly adjust the concentration and coverage of the gas curtain according to the furnace opening conditions, furnace pressure and the required protection effect, so as to achieve economical and efficient anti-oxidation protection. A scrap port 3 is located at the lower end of the closed end of the feed channel 1. Its main function is to collect and clean up iron oxide scale, dust, fine slag, or occasionally falling non-metallic debris generated during the conveying process. If these scraps accumulate at the bottom of the channel, they may obstruct the operation of the pusher seat 19 or enter the electric furnace with the main material, affecting the quality of the molten steel. The opening and closing of the scrap port 3 is controlled by a quick-sealing door, which consists of a sealing plate 31, an inner sleeve 32, a threaded post 33, and a threaded knob 34. The sealing plate 31 covers the port of the scrap port 3, and the inner sleeve 32 is fixedly fixed through both sides of it. Correspondingly, a device aligned with the position of the inner sleeve 32 is fixedly installed on the outer wall of the feed channel 1. During normal feeding operations, the inner sleeve 32 of the sealing plate 31 is fitted into the corresponding threaded post 33, and then the threaded knob 34 is tightened at the end of the threaded post 33 to press the sealing plate 31, thereby achieving a reliable seal of the waste port 3 and preventing leakage of inert gas and heat loss in the device. When regular maintenance and cleaning are required, the operator only needs to unscrew the threaded knobs 34 at both ends to easily remove the sealing plate 31, allowing the waste port 3 to be fully opened, facilitating the quick removal of accumulated debris. After cleaning, the sealing plate 31 is reinstalled and the threaded knob 34 is tightened to restore the seal. The operation is simple and quick, greatly facilitating the daily maintenance of the equipment.

[0029] The above description is merely an embodiment of this utility model, and common knowledge such as specific structures and characteristics in the solution is not described in detail here. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these should also be considered within the protection scope of this utility model. These modifications and improvements will not affect the effectiveness of the implementation of this utility model or its practicality.

Claims

1. An automatic anti-oxidation feeding device for electric furnace smelting of scrap steel, characterized in that: It includes a feeding channel (1), which is a rectangular channel structure with one side being a closed structure. The upper end of the feeding channel (1) is provided with a feeding port (11), and a feeding funnel (12) is installed on the feeding port (11). A bearing (13) is fixedly installed through the center of the closed end of the feed channel (1). A threaded rod (14) is installed on the inner ring wall of the bearing (13) with an interference fit. An anti-detachment plate (110) is fixedly installed at one end of the threaded rod (14) inside the feed channel (1). Support seats (15) are fixedly installed on both sides of the anti-detachment plate (110). The end face of the support seat (15) is connected to the inner wall of the feed channel (1) through a support rod (16). The threaded rod (14) is threaded with a threaded sleeve (18), and a limit rod (17) is symmetrically installed on the outer ring wall of the threaded sleeve (18). A pusher seat (19) is fixedly installed at the other end of the limit rod (17), and the pusher seat (19) has a U-shaped structure. The support base (15) is fixedly installed with a pusher ramp (1001) at one end near the opening of the feed channel (1). The outer end of the threaded rod (14) is provided with a motor (1002), and the outer ring wall of the motor (1002) is fixed to the outer wall of the feed channel (1) by a bracket.

2. The automatic anti-oxidation feeding device for electric furnace smelting of scrap steel according to claim 1, characterized in that: The motor (1002) has a drive shaft inside, and the end of the drive shaft is connected to the threaded rod (14) via a coupling.

3. The automatic anti-oxidation feeding device for electric furnace smelting of scrap steel according to claim 2, characterized in that: The upper end of the opening of the feeding channel (1) is fixed with several air nozzles (2), and the upper ends of the several air nozzles (2) are connected to an air supply pipe (21).

4. The automatic anti-oxidation feeding device for electric furnace smelting of scrap steel according to claim 3, characterized in that: An extension plate (24) is fixedly installed on the outer wall of the feed channel (1). An air pump (22) is fixedly installed on the upper end of the extension plate (24). The air outlet of the air pump (22) is connected to the flange of the air supply pipe (21).

5. The automatic anti-oxidation feeding device for electric furnace smelting of scrap steel according to claim 4, characterized in that: The air pump (22) is equipped with a flow regulating valve (23) at its air inlet end.

6. The automatic anti-oxidation feeding device for electric furnace smelting of scrap steel according to claim 5, characterized in that: The feed channel (1) has a waste outlet (3) located at the lower part of the closed end.

7. The automatic anti-oxidation feeding device for electric furnace smelting of scrap steel according to claim 6, characterized in that: A sealing plate (31) is provided on the outer wall of the feeding channel (1), and the sealing plate (31) covers the port position of the waste port (3).

8. The automatic anti-oxidation feeding device for electric furnace smelting of scrap steel according to claim 7, characterized in that: Both sides of the sealing plate (31) are fixed with an inner sleeve (32), and a threaded post (33) corresponding to the inner sleeve (32) is fixedly installed on the outer wall of the feeding channel (1). A threaded knob (34) is threadedly installed at the end of the threaded post (33).

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