Submerged arc furnace charge preheating mode and preheating device

Abstract

The invention relates to the technical field of submerged arc furnace charge preheating, in particular to a submerged arc furnace charge preheating method and preheating device.The submerged arc furnace charge preheating device comprises an equipment frame, a submerged arc furnace is installed on one side of the equipment frame, a fixing base is fixedly installed on the equipment frame through a hydraulic rod, a charge barrel is rotationally connected to the fixing base, and a barrel cover is arranged above the charge barrel; a plurality of furnace charge stirring mechanisms are fixedly connected to the bottom of the furnace charge barrel, a waste gas recycling seat is fixedly connected to one side of the fixed seat, and a gas collecting hood is fixedly connected to one side of the waste gas recycling seat. Compared with the prior art, large-particle ore can be heated more uniformly in the preheating process, and furnace charge can reach the required reaction temperature more quickly when entering the submerged arc furnace through more uniform and efficient preheating, so that the energy consumption in the smelting process is reduced, the energy utilization efficiency is improved, and energy is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of preheating charge of an ore-bearing furnace, and in particular to a preheating method and a preheating device for preheating charge of an ore-bearing furnace. Background Art

[0002] Preheating a submerged arc furnace charge involves preheating the charge to a specific temperature before it enters the furnace through external heating. This improves the charge's reaction efficiency and reduces energy consumption. Energy-saving furnaces are a new type of smelting equipment developed in recent years to improve energy efficiency and reduce energy consumption. Compared to traditional furnaces, energy-saving furnaces focus on minimizing heat loss and optimizing temperature distribution within the furnace during design and operation, thereby achieving energy savings. These furnaces typically utilize more advanced insulation technologies, in-furnace airflow control systems, and more efficient combustion technologies.

[0003] The document with the prior art publication number CN117029506A provides a method and device for preheating charges in an ore-heating furnace. The high-temperature gas generated in the ore-heating furnace rises and first enters the preheating channel from the bottom and surrounding areas to preheat the material in the preheating channel. Some of the harmful substances on a portion of the high-temperature gas passing through the preheating channel are adsorbed on the material. As the material enters the ore-heating furnace for smelting, a portion of the high-temperature gas continues to rise to preheat the material in each discharge hole, and finally is recovered through a waste heat recovery device. It can improve the utilization of harmful substances and reduce the emission of harmful substances. The preheating device for preheating charges in an ore-heating furnace of the present invention utilizes a discharge tray, a breathable fence, and an isolation plate to form a preheating channel. The discharge holes on the discharge tray extend the preheating channel, making full use of the high-temperature gas generated in the ore-heating furnace and reducing the emission of harmful substances.

[0004] Existing technology uses high-temperature gas generated by the submerged arc furnace to preheat the material during use. However, because existing technology is not convenient for stirring the material to be preheated, such as large-particle ore, the high-temperature gas may only evenly heat the outer layer of the material during the preheating process, while the material inside may not be fully exposed to the hot gas, resulting in unsatisfactory preheating effect within the material. Due to the uneven heating of the material, some materials may not fully realize their reaction potential due to insufficient preheating, resulting in energy waste and reduced material processing efficiency. Insufficiently preheated materials may require more energy to heat after entering the submerged arc furnace, thereby reducing energy savings.

[0005] In summary, the prior art lacks a technology for preheating large-particle ores by stirring. Summary of the Invention

[0006] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a method and a preheating device for preheating charge of a submerged arc furnace.

[0007] In order to achieve the above purpose, the technical solution adopted by the present invention is: a device for preheating charge of an electric arc furnace, comprising an equipment frame, an electric arc furnace is installed on one side of the equipment frame, a fixed seat is fixedly provided on the equipment frame through a hydraulic rod, a charge barrel is rotatably connected to the fixed seat, a barrel cover is provided above the charge barrel, a plurality of charge stirring mechanisms are fixedly connected to the bottom of the charge barrel, an exhaust gas recovery seat is fixedly provided on one side of the fixed seat, and an air collecting hood is fixedly provided on one side of the exhaust gas recovery seat.

[0008] Preferably, a fixed gear ring is fixedly connected to the lower surface of the fixing seat.

[0009] Preferably, a connecting frame is fixedly connected to the inner wall of the top of the charge barrel, and a motor is fixedly connected to the top of the connecting frame through the barrel cover, and the motor is fixedly connected to the fixed seat. An annular frame is fixedly connected to the outer wall of the charge barrel, and a plurality of rollers are rotatably connected to the annular frame in an annular structure. The rollers are in sliding contact with the upper surface of the fixed seat, and a transmission gear ring is fixedly connected to the upper surface of the annular frame.

[0010] Preferably, an electric push rod is fixedly connected to the upper surface of the barrel cover, and the other end of the electric push rod is fixedly connected to the fixed seat. The barrel cover is arranged in a hollow structure, and a plurality of air distribution holes are opened on the lower surface of the barrel cover. An air guide tube is fixedly connected through one side of the upper surface of the barrel cover, and the barrel cover is slidingly matched with the connecting frame.

[0011] Preferably, the charge stirring mechanism includes a fixed frame, which is fixedly connected to the outer wall of the charge barrel, a reciprocating screw rod is rotatably connected to one end of the fixed frame, an adjusting wheel is fixedly connected to the top end of the reciprocating screw rod, the adjusting wheel is meshed with a fixed gear ring for transmission, an adjusting seat is slidingly fitted on the outer wall of the reciprocating screw rod, and a connecting rod is rotatably connected to the adjusting seat.

[0012] Preferably, a swinging crowbar is rotatably connected to the other end of the connecting rod, and the swinging crowbar is rotatably connected to the fixed frame near the other end. A U-shaped plate is slidingly fitted on the other end of the swinging crowbar, and a charge push rod is fixedly connected to the U-shaped plate. The charge push rod is slidingly fitted through the outer wall of the charge barrel.

[0013] Preferably, the inner wall of the exhaust gas recovery seat is symmetrically structured and slidingly fitted with two piston plates, a plurality of springs are fixedly connected to one side of the piston plate, and the other end of the spring is fixedly connected to the inner wall of the exhaust gas recovery seat, a rotating shaft is provided through the middle inner wall of the exhaust gas recovery seat, a push rod is fixedly provided on the middle outer wall of the rotating shaft, and the other end of the push rod is provided in sliding contact with the two piston plates, a transmission wheel is fixedly provided at one end of the rotating shaft, and the transmission wheel is meshed with the transmission gear ring for transmission, an exhaust pipe is fixedly provided on the upper side of the exhaust gas recovery seat, the inner wall of the top end of the exhaust pipe is slidingly fitted with the outer wall of the air guide pipe, and an intake pipe is fixedly provided through the middle of the exhaust gas recovery seat.

[0014] Preferably, a processing tube is fixedly connected to one end of the gas collecting hood, a conical filter is rotatably connected to the inner wall of the processing tube, one end of the conical filter extends through the inner wall of the processing tube to the outside and is fixedly connected to the rotating shaft, one side of the processing tube is fixedly connected to the air intake pipe, a cleaning port is provided on one side of the bottom end of the processing tube, a blocking cover is rotatably connected to the outer wall of one end of the processing tube, and the inner wall of one end of the blocking cover is slidably matched with the outer wall of the air intake pipe.

[0015] A method for preheating charge of a submerged arc furnace specifically comprises the following steps: S1. First, move the barrel cover upwards, place the charge into the charge barrel, and then move the barrel cover downwards to close it; S2. Then, during the use of the submerged arc furnace, the charge barrel is controlled to rotate, and the charge stirring mechanism is used to stir the charge to ensure uniform preheating; S3. The rotating charge barrel can drive the exhaust gas recovery seat to draw the high-temperature exhaust gas at the opening of the submerged arc furnace into the charge barrel through the gas collecting hood to preheat the charge inside.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up a charge stirring mechanism, while the charge barrel rotates, the swinging pry bar will drive the charge push rod to move up and down, pushing the large-particle ore in the charge barrel, so that when the large-particle ore is preheated, the large-particle ore can be heated more evenly during the preheating process. The stirring allows different parts of the ore to fully contact with the high-temperature gas, avoiding uneven heating of the material and ensuring a more consistent preheating effect of the ore. Through more uniform and efficient preheating, the charge can reach the required reaction temperature faster when entering the submerged arc furnace, thereby reducing energy consumption in the smelting process, improving overall energy utilization efficiency, and saving energy; 2. By setting up the waste gas recovery seat and the gas collection hood, the piston plate can be driven to move back and forth while the charge barrel rotates to recover high-temperature waste gas, which can reduce manual intervention and automatically complete the waste gas recovery and charge preheating processes, thereby improving the degree of automation of the production process, reducing the risk of human operational errors, and improving overall production efficiency. At the same time, the conical filter at one end of the gas collection hood can effectively filter particulate matter in the waste gas, preventing these particles from entering the charge barrel and contacting the charge, maintaining the purity of the charge, and preventing particulate matter from having a negative impact on the quality of the charge. This can ensure that the charge preheating process is cleaner, avoid charge contamination, and thus improve the quality of the smelting products; 3. By opening multiple air distribution holes on the barrel cover, high-temperature exhaust gas can be evenly injected into the charge barrel. At the same time, the multiple rollers on the annular frame make the charge barrel more labor-saving when rotating, which not only improves the utilization efficiency of exhaust gas and the preheating effect of charge, but also improves the stability of the equipment, energy saving effect and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the overall structure of a charge preheating method and preheating device for a submerged arc furnace according to the present invention; Figure 2 This is a schematic diagram of the other side of the overall structure of a charge preheating method and preheating device for a submerged arc furnace according to the present invention; Figure 3 This is a schematic diagram of a preheating method for charge in a submerged arc furnace and a fixed seat structure of a preheating device according to the present invention; Figure 4 It is a partial cross-sectional schematic diagram of a charge preheating method and charge barrel structure of a preheating device for a submerged arc furnace according to the present invention; Figure 5 This is a schematic cross-sectional view of a method for preheating charge in a submerged arc furnace and a barrel cover structure of a preheating device according to the present invention; Figure 6 This is a schematic diagram of a charge preheating method and charge stirring mechanism of a preheating device for a submerged arc furnace according to the present invention; Figure 7 It is a partial cross-sectional expanded schematic diagram of a preheating method for charge of a submerged arc furnace and a waste gas recovery seat structure of a preheating device of the present invention; Figure 8 The present invention is a partial cross-sectional expansion schematic diagram of a method for preheating charge of an electric arc furnace and a gas collecting hood structure of a preheating device.

[0018] The following are marked in the figure: 1. Equipment rack; 2. Submerged arc furnace; 3. Fixed seat; 4. Furnace charge barrel; 5. Barrel cover; 6. Furnace charge stirring mechanism; 7. Waste gas recovery seat; 8. Gas collecting hood; 301. Fixed gear ring; 401. Connecting frame; 402. Motor; 403. Ring frame; 404. Roller; 405. Transmission gear ring; 501. Electric push rod; 502. Air distribution hole; 503. Air guide pipe; 601. Fixed frame; 60 2. Reciprocating screw; 603. Adjusting wheel; 604. Adjusting seat; 605. Connecting rod; 606. Swinging pry bar; 607. U-shaped plate; 608. Charge ejector; 701. Piston plate; 702. Spring; 703. Rotating shaft; 704. Push rod; 705. Drive wheel; 706. Exhaust pipe; 707. Inlet pipe; 801. Processing pipe; 802. Conical filter; 803. Cleaning port; 804. Shield. DETAILED DESCRIPTION

[0019] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0020] like Figures 1-8 The shown method and device for preheating charge of an ore-heating furnace include an equipment frame 1, an ore-heating furnace 2 is installed on one side of the equipment frame 1, a fixed seat 3 is fixedly provided on the equipment frame 1 through a hydraulic rod, a charge barrel 4 is rotatably connected to the fixed seat 3, a barrel cover 5 is provided above the charge barrel 4, a plurality of charge stirring mechanisms 6 are fixedly connected to the bottom of the charge barrel 4, an exhaust gas recovery seat 7 is fixedly provided on one side of the fixed seat 3, and an air collecting hood 8 is fixedly provided on one side of the exhaust gas recovery seat 7.

[0021] like Figure 3 As shown, a fixed gear ring 301 is fixedly connected to the lower surface of the fixing seat 3.

[0022] like Figure 4 As shown, a connecting frame 401 is fixedly connected to the inner wall of the top of the charge barrel 4, and a motor 402 is fixedly connected to the top of the connecting frame 401 through the barrel cover 5. The motor 402 is fixedly connected to the fixed seat 3. An annular frame 403 is fixedly connected to the outer wall of the charge barrel 4. A plurality of rollers 404 are rotatably connected to the annular frame 403 in an annular structure. The rollers 404 are in sliding contact with the upper surface of the fixed seat 3, and a transmission gear ring 405 is fixedly connected to the upper surface of the annular frame 403.

[0023] like Figure 5As shown, an electric push rod 501 is fixedly connected to the upper surface of the barrel cover 5, and the other end of the electric push rod 501 is fixedly connected to the fixed seat 3. The barrel cover 5 is arranged in a hollow structure, and a plurality of air distribution holes 502 are opened on the lower surface of the barrel cover 5. An air guide tube 503 is fixedly connected through one side of the upper surface of the barrel cover 5, and the barrel cover 5 is slidingly matched with the connecting frame 401.

[0024] like Figure 6 As shown, the charge stirring mechanism 6 includes a fixed frame 601, which is fixedly connected to the outer wall of the charge barrel 4, and a reciprocating screw 602 is rotatably connected to one end of the fixed frame 601. An adjusting wheel 603 is fixedly connected to the top of the reciprocating screw 602, and the adjusting wheel 603 is meshed with the fixed gear ring 301 for transmission. An adjusting seat 604 is slidably fitted on the outer wall of the reciprocating screw 602, and a connecting rod 605 is rotatably connected to the adjusting seat 604.

[0025] The other end of the connecting rod 605 is rotatably connected to a swinging pry bar 606. The position of the swinging pry bar 606 near the other end is rotatably connected to the fixed frame 601. The other end of the swinging pry bar 606 is slidably matched with a U-shaped plate 607. A charge push rod 608 is fixedly connected to the U-shaped plate 607. The charge push rod 608 is slidably matched with the outer wall of the charge barrel 4. The swinging pry bar 606 uses the principle of leverage to drive the charge push rod 608 to move up and down, which is more labor-saving. Under the action of the fixed gear ring 301, the meshing adjusting wheel 603 drives the connected reciprocating screw 602 to rotate, so that the reciprocating screw 602 can drive the adjusting seat 604 to move back and forth. At this time, the swinging pry bar 606 is driven to swing back and forth through the connecting rod 605, thereby driving the charge push rod 608 on the U-shaped plate 607 to move back and forth.

[0026] By setting up a charge stirring mechanism 6, while the charge barrel 4 rotates, the swinging pry bar 606 will drive the charge top rod 608 to move up and down, pushing the large-particle ore in the charge barrel 4, so that when the large-particle ore is preheated, the large-particle ore can be heated more evenly during the preheating process. The stirring allows different parts of the ore to fully contact with the high-temperature gas, avoiding uneven heating of the material and ensuring a more consistent preheating effect of the ore. Through more uniform and efficient preheating, the charge can reach the required reaction temperature more quickly when entering the smelting furnace 2, thereby reducing energy consumption in the smelting process, improving overall energy utilization efficiency, and saving energy.

[0027] like Figure 7As shown, the inner wall of the exhaust gas recovery seat 7 is symmetrically structured and slidingly fitted with two piston plates 701. Multiple springs 702 are fixedly attached to one side of the piston plates 701, with the other ends of the springs 702 fixedly connected to the inner wall of the exhaust gas recovery seat 7. A rotating shaft 703 is rotatably provided through the middle inner wall of the exhaust gas recovery seat 7. A push rod 704 is fixedly attached to the middle outer wall of the rotating shaft 703, with the other ends of the push rod 704 slidingly contacting the two piston plates 701. A transmission wheel 705 is fixedly attached to one end of the rotating shaft 703, which meshes with the transmission gear ring 405 for transmission. An exhaust pipe 706 is fixedly provided through the upper side of the exhaust gas recovery seat 7, with the inner wall of the top end of the exhaust pipe 706 slidingly fitting with the outer wall of the air guide pipe 503. An intake pipe 707 is fixedly provided through the middle of the exhaust gas recovery seat 7. One-way valves are installed at both ends of the intake pipe 707 and the exhaust pipe 706. The springs 702 drive the piston plate 701 to automatically reset and exhaust air. When the charge barrel 4 rotates, it will drive the transmission gear ring 405 on the annular frame 403 to rotate. At this time, the transmission gear ring 405 will drive the rotating shaft 703 connected to the transmission wheel 705 to rotate. At this time, the rotating shaft 703 will drive the push rod 704 to rotate. At this time, the push rod 704 will contact and squeeze the piston plate 701, so that the high-temperature exhaust gas generated by the electric arc furnace 2 is sucked into the exhaust gas recovery seat 7.

[0028] like Figure 8 As shown, a treatment tube 801 is fixedly connected to one end of the gas collection hood 8. A conical filter 802 is rotatably connected to the inner wall of the treatment tube 801. One end of the conical filter 802 extends through the inner wall of the treatment tube 801 to the outside and is fixedly connected to the rotating shaft 703. One side of the treatment tube 801 is fixedly connected to the intake pipe 707. A cleaning port 803 is opened on one side of the bottom end of the treatment tube 801. A blocking cover 804 is rotatably connected to the outer wall of one end of the treatment tube 801. The inner wall of one end of the blocking cover 804 is slidably engaged with the outer wall of the intake pipe 707. When the rotating shaft 703 rotates, it drives the connected conical filter 802 to rotate, allowing the conical filter 802 to continuously filter particulate matter drawn into the high-temperature exhaust gas. The blocking cover 804 is then rotated to remove, exposing the cleaning port 803.

[0029] A method for preheating charge of a submerged arc furnace specifically comprises the following steps: S1. First, move the barrel cover 5 upwards, place the charge into the charge barrel 4, and then move the barrel cover 5 downwards to close it; S2. Then, during the use of the submerged arc furnace 2, the charge barrel 4 is controlled to rotate, and the charge stirring mechanism 6 is used to stir the charge to ensure uniform preheating; S3. The rotating charge barrel 4 can drive the exhaust gas recovery seat 7 to draw the high-temperature exhaust gas at the opening of the submerged arc furnace 2 into the charge barrel 4 through the gas collecting hood 8 to preheat the charge inside.

[0030] Working principle: When the charge needs to be preheated, first use the electric push rod 501 to drive the barrel cover 5 to move up, then place the charge into the charge barrel 4, and then move the barrel cover 5 down to close it; Then, the motor 402 is used to drive the charge barrel 4 connected to the connecting frame 401 to rotate. At this time, the charge barrel 4 will drive the charge stirring mechanism 6 to rotate. Then, under the action of the fixed gear ring 301, the meshing adjusting wheel 603 will drive the connected reciprocating screw 602 to rotate, so that the reciprocating screw 602 can drive the adjusting seat 604 to move back and forth. At this time, the swing pry bar 606 will be driven to swing back and forth through the connecting rod 605, thereby driving the charge push rod 608 on the U-shaped plate 607 to move back and forth, thereby stirring the charge in the charge barrel 4; At the same time, when the charge barrel 4 rotates, it will drive the transmission gear ring 405 on the annular frame 403 to rotate. At this time, the transmission gear ring 405 will drive the rotating shaft 703 connected to the transmission wheel 705 to rotate. At this time, the rotating shaft 703 will drive the push rod 704 to rotate. At this time, the push rod 704 will contact and squeeze the piston plate 701, so that the high-temperature exhaust gas generated by the ore-fired furnace 2 is sucked into the exhaust gas recovery seat 7, and injected into the barrel cover 5 through the exhaust pipe 706 and the air guide pipe 503, and then evenly distributed into the charge barrel 4 through the air distribution holes 502 on the barrel cover 5, so as to preheat the charge. The preheated air is then discharged through the mesh plate at the bottom of the charge barrel 4; At the same time, when the rotating shaft 703 rotates, it drives the connected conical filter 802 to rotate, so that the conical filter 802 can continuously filter the particulate matter drawn into the high-temperature exhaust gas. Then, by rotating and removing the blocking cover 804, the cleaning port 803 is exposed, and the filtered particulate matter can be cleaned. When the preheated charge needs to be added into the submerged arc furnace 2, the hydraulic rod is used to drive the fixed seat 3 to move so that the bottom opening of the charge barrel 4 is aligned with the submerged arc furnace 2, and then the mesh plate at the bottom opening of the charge barrel 4 is opened, so that the charge inside can automatically fall into the submerged arc furnace 2 for smelting.

[0031] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0032] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A charge preheating device for a submerged arc furnace, comprising a device frame (1), characterized in that: A mineral heating furnace (2) is installed on one side of the equipment frame (1); a fixed seat (3) is fixedly installed on the equipment frame (1) via a hydraulic rod; a furnace charge barrel (4) is rotatably connected to the fixed seat (3); a barrel cover (5) is provided above the furnace charge barrel (4); a plurality of furnace charge stirring mechanisms (6) are fixedly connected to the bottom of the furnace charge barrel (4); an exhaust gas recovery seat (7) is fixedly connected to one side of the fixed seat (3); and a gas collecting hood (8) is fixedly connected to one side of the exhaust gas recovery seat (7).

2. The charge preheating device for a submerged arc furnace according to claim 1, characterized in that: A fixed gear ring (301) is fixedly connected to the lower surface of the fixing seat (3).

3. The charge preheating device for a submerged arc furnace according to claim 2, characterized in that: A connecting frame (401) is fixedly connected to the inner wall of the top of the charge barrel (4), a motor (402) is fixedly connected to the top of the connecting frame (401), the motor (402) is fixedly connected to the fixing seat (3), an annular frame (403) is fixedly connected to the outer wall of the charge barrel (4), a plurality of rollers (404) are rotatably connected to the annular frame (403), the rollers (404) are in sliding contact with the upper surface of the fixing seat (3), and a transmission gear ring (405) is fixedly connected to the upper surface of the annular frame (403).

4. The charge preheating device for a submerged arc furnace according to claim 3, characterized in that: An electric push rod (501) is fixedly connected to the upper surface of the barrel cover (5), and the other end of the electric push rod (501) is fixedly connected to the fixing seat (3). The barrel cover (5) is arranged in a hollow structure, and a plurality of air distribution holes (502) are opened on the lower surface of the barrel cover (5). An air guide tube (503) is fixedly connected and penetrates one side of the upper surface of the barrel cover (5). The barrel cover (5) is arranged in a sliding manner with the connecting frame (401).

5. The charge preheating device for a submerged arc furnace according to claim 4, characterized in that: The charge stirring mechanism (6) includes a fixed frame (601), the fixed frame (601) is fixedly connected to the outer wall of the charge barrel (4), one end of the fixed frame (601) is rotatably connected to a reciprocating screw (602), the top end of the reciprocating screw (602) is fixedly connected to an adjusting wheel (603), the adjusting wheel (603) is meshed with a fixed gear ring (301) for transmission, the outer wall of the reciprocating screw (602) is slidably matched with an adjusting seat (604), and a connecting rod (605) is rotatably connected to the adjusting seat (604).

6. The charge preheating device for a submerged arc furnace according to claim 5, characterized in that: The other end of the connecting rod (605) is rotatably connected to a swinging pry bar (606), and the swinging pry bar (606) is rotatably connected to the fixed frame (601) near the other end. The other end of the swinging pry bar (606) is slidably fitted with a U-shaped plate (607), and a charge push rod (608) is fixedly connected to the U-shaped plate (607). The charge push rod (608) is slidably fitted to the outer wall of the charge barrel (4).

7. The charge preheating device for a submerged arc furnace according to claim 6, characterized in that: The inner wall of the exhaust gas recovery seat (7) is symmetrically structured and slidingly matched with two piston plates (701), one side of the piston plate (701) is fixedly connected with a plurality of springs (702), the other end of the spring (702) is fixedly connected with the inner wall of the exhaust gas recovery seat (7), the middle inner wall of the exhaust gas recovery seat (7) is provided with a rotating shaft (703) through which rotation is connected, the middle outer wall of the rotating shaft (703) is fixedly connected with a push rod (704), the other end of the push rod (704) is fixedly connected with the inner wall of the exhaust gas recovery seat (7). The ends of the rotating shaft (703) are arranged in sliding contact with the two piston plates (701), one end of the rotating shaft (703) is fixedly connected with a transmission wheel (705), and the transmission wheel (705) is meshed with the transmission gear ring (405) for transmission. An exhaust pipe (706) is fixedly connected to the upper side of the exhaust gas recovery seat (7), and the inner wall of the top end of the exhaust pipe (706) is slidably matched with the outer wall of the air guide pipe (503). An intake pipe (707) is fixedly connected to the middle part of the exhaust gas recovery seat (7).

8. The charge preheating device for a submerged arc furnace according to claim 7, characterized in that: One end of the gas collecting hood (8) is fixedly connected to a processing tube (801), and the inner wall of the processing tube (801) is rotatably connected to a conical filter (802), one end of the conical filter (802) passes through the inner wall of the processing tube (801) and extends to the outside and is fixedly connected to the rotating shaft (703), one side of the processing tube (801) is fixedly connected to the air inlet pipe (707), and a cleaning port (803) is provided on one side of the bottom end of the processing tube (801), and one end of the processing tube (801) is rotatably connected to the outer wall with a blocking cover (804), and the inner wall of one end of the blocking cover (804) is slidably matched with the outer wall of the air inlet pipe (707).

9. A method for preheating charge for a submerged arc furnace, using the submerged arc furnace charge preheating device according to any one of claims 1 to 8, comprising the following steps: S1. First, move the barrel cover (5) upwards, place the charge into the charge barrel (4), and then move the barrel cover (5) downwards to close it; S2. Then, during the use of the ore-fired furnace (2), the charge barrel (4) is controlled to rotate, and the charge stirring mechanism (6) is used to stir the charge to ensure uniform preheating; S3. The rotating furnace charge barrel (4) can drive the waste gas recovery seat (7) to draw the high-temperature waste gas at the opening of the ore-fired furnace (2) into the furnace charge barrel (4) through the gas collecting hood (8), thereby preheating the furnace charge inside.

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