A medium frequency furnace scrap steel roasting device

Abstract

The present application belongs to the technical field of scrap steel roasting, and discloses a kind of scrap steel roasting device of intermediate frequency furnace.The scrap steel roasting mechanism is arranged on the support platform, and the scrap steel roasting mechanism is also connected with the gas pipeline assembly, the air pipeline assembly, the air pipeline assembly is connected with the air duct pipeline assembly, and the scrap steel roasting mechanism includes the lifting assembly, the warehouse cover and the roasting warehouse arranged in order from top to bottom.The lifting assembly is arranged on the support platform through the lifting assembly support, the warehouse cover is arranged on the lifting assembly, the roasting warehouse is arranged on the support platform, and four burners are arranged around each roasting warehouse.Four burners are arranged in double layers from top to bottom and arranged in a circular pattern on the roasting warehouse.A guide assembly is arranged between the lifting assembly and the lifting assembly support to move the lifting assembly horizontally left and right on the lifting assembly support.The scrap steel can be quickly heated, energy can be recovered, harmful emissions can be reduced, the structure is simple, reasonable and easy to maintain.

Description

Technical Field

[0001] This invention belongs to the field of scrap steel baking technology, and relates to a medium-frequency furnace scrap steel baking device. Background Technology

[0002] In the foundry industry, medium-frequency induction furnaces are used as production equipment for metal smelting. These furnaces utilize the principle of electromagnetic induction to convert electrical energy into heat energy, heating scrap steel to supply molten iron. The energy consumption of medium-frequency furnaces accounts for approximately 75% of the total energy consumption of a foundry. Therefore, reducing the electricity consumption of medium-frequency furnaces plays a significant role in the development of foundry enterprises.

[0003] For some foundries equipped with small blast furnaces, blast furnace gas, as a byproduct of blast furnace ironmaking, often has a low utilization rate. Therefore, it is urgent to make full use of this part of the blast furnace gas to create economic benefits for enterprises. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings in the above-mentioned background technology and provide a medium-frequency furnace scrap steel baking device that can rapidly heat scrap steel, recover energy, reduce harmful emissions, has a simple structure, reasonable setup, and is easy to maintain.

[0005] The technical solution adopted by this invention to solve its technical problem is: a medium-frequency furnace scrap steel baking device, including a scrap steel baking mechanism; the scrap steel baking mechanism is set on a support platform, and the scrap steel baking mechanism is also connected to a gas pipeline assembly and an air pipeline assembly respectively. The air pipeline assembly is connected to an induced draft pipeline assembly. The scrap steel baking mechanism includes a lifting assembly, a bin cover, and a baking bin arranged sequentially from top to bottom; the lifting assembly is set on the support platform through a lifting assembly bracket, the bin cover is set on the lifting assembly, and the baking bin is set on the support platform, with four burners inserted around the outer periphery of each baking bin; the four burners are arranged in two layers, upper and lower, and circumferentially on the baking bin; a guide assembly is set between the lifting assembly and the lifting assembly bracket to allow the lifting assembly to move left and right in the horizontal direction of the lifting assembly bracket.

[0006] The lifting assembly includes a traveling frame, with an electric hoist mounted on top of the traveling frame. The electric hoist is fixed to the traveling frame via a hanger. The traveling frame has casters at its four corners at the bottom. Two casters on the same side are connected by bearings. Each caster on each side is equipped with a separate drive motor, the output of which is connected to the caster for actuation. Two manganese steel chains are also mounted on the top of the traveling frame, respectively on both sides of the electric hoist.

[0007] The guiding assembly consists of a track mounted on the lifting assembly bracket and casters on the lifting assembly.

[0008] The silo cover includes a baking silo cover shell. A lifting lug is located at the center of the top of the baking silo cover shell, and the lifting lug is connected to an electric hoist. Lifting lugs are located on both sides of the lifting lug, and the two lifting lugs are connected to manganese steel chains respectively. Several stainless steel hooks and lightweight castable refractory are installed inside the baking silo cover shell. Channel steel is also provided on both sides of the baking silo cover shell. The stainless steel hooks are welded to the inside of the baking silo cover shell, and then the lightweight castable refractory is poured into the baking silo cover shell.

[0009] The lifting assembly, powered by an electric hoist, allows the bin cover to be raised or lowered by 100mm. The lifting assembly, driven by a motor, also allows for left and right movement.

[0010] The baking chamber includes a furnace body, with a scrap steel hopper at the top and a furnace body base and scrap steel discharge gate at the bottom. The scrap steel discharge gate is connected to the furnace body via scrap steel discharge gate lifting lugs. The inner wall of the furnace body is lined with lightweight castable material, and burner bases are provided at the connection between the furnace body and the burners. The furnace body base has a discharge channel, and the scrap steel discharge gate is located below the furnace body base. The scrap steel discharge gate is divided into left and right discharge gates, each equipped with a hydraulic push rod and a locking assembly. The discharge gates are opened and closed by moving the hydraulic push rod through the locking assembly.

[0011] The scrap steel hopper is fixed to the furnace body using M16 high-strength bolts. The furnace body is connected to the furnace body base using M24 high-strength bolts. The scrap steel discharge gate is fixed to the scrap steel discharge gate lifting lugs using fasteners. The scrap steel discharge gate lifting lugs are welded to the furnace body. The front end of the hydraulic push rod is connected to the discharge gate using a hydraulic push rod fixing component.

[0012] The number of locking components matches the number of hydraulic push rods. Each locking component includes a front-mounted flange-type hydraulic cylinder. The front end of the hydraulic rod of the front-mounted flange-type hydraulic cylinder is connected to a locking plate, which is connected to the bottom of the hydraulic push rod. The front-mounted flange-type hydraulic cylinder is fixed to the support platform via a support base and hexagonal bolts. The locking plate and the front-mounted flange-type cylinder are connected by threads.

[0013] The gas pipeline assembly is connected to each burner, the air pipeline assembly is connected to each burner, and the induced draft pipeline assembly is connected to the baking chamber.

[0014] Two sets of scrap steel baking mechanisms are preferred.

[0015] The gas pipeline assembly includes a gas pipeline, on which a manual butterfly valve, a gas pressure transmitter, a gas quick-cut valve C, a gas electric regulating valve, and a gas flow meter are sequentially installed. At the end of the gas pipeline, gas branch pipes A and B are connected to the left and right sides respectively. Gas quick-cut valve A is installed on gas branch pipe A, and gas quick-cut valve B is installed on gas branch pipe B. Each of gas branch pipes A and B connects to several gas sub-pipes, the total number of which corresponds to the number of burners. Gas branch pipes A and B are connected to burners of different scrap steel baking mechanisms.

[0016] The air piping assembly includes an air duct, with a blower at the front end. An electric air regulating valve and an air preheater are sequentially installed on the air duct. The air preheater connects to the air duct at its end, and air branch pipes A and B are connected to its left and right sides, respectively. Air branch pipe A is equipped with an air quick-cut valve A, and air branch pipe B is equipped with an air quick-cut valve B. Each of air branch pipes A and B connects to several air sub-pipes, the total number of which corresponds to the number of burners. Air branch pipes A and B are connected to burners of different scrap steel baking mechanisms.

[0017] The induced draft duct assembly includes an induced draft duct, the front end of which is connected to the furnace body, and the rear end of which is connected to an external dust collector via a pipe. The front end of the induced draft duct is connected to an air preheater on the air duct.

[0018] The blower is connected to the front end of the air duct with a flexible connection.

[0019] Furthermore, the lightweight castable and lightweight refractory are commercially available products. High-alumina bauxite is preferred.

[0020] Furthermore, the furnace body is integrally cast from high-temperature resistant cast iron. The baking chamber is welded to the support platform. The lifting assembly bracket and support platform are welded from profiles.

[0021] Furthermore, the burner is a scrap steel preheating spray gun (CN212339244U), and each burner is equipped with an automatic igniter and a flame detector.

[0022] The gas pipeline can also be connected to a nitrogen purging pipeline.

[0023] The device is also equipped with a PLC control system. The electric hoist, drive motor, front flange hydraulic cylinder, gas pressure transmitter, gas quick-cut valve C, gas electric regulating valve, gas flow meter, gas quick-cut valve A, gas quick-cut valve B, air preheater, blower, air electric regulating valve, air quick-cut valve A, air quick-cut valve B, burner, automatic igniter, and flame detector are all connected to the PLC control system and are all limited to a specific model to realize their working functions.

[0024] The beneficial effects of this invention compared to the prior art are:

[0025] The medium-frequency furnace scrap steel baking device provided by this invention has a simple structure, is safe, convenient, practical, environmentally friendly, and has a long service life. The baking chamber is integrally cast from high-temperature resistant cast iron. After casting, lightweight castable refractory is poured into the jacket of the baking chamber to ensure the heat resistance and insulation of the scrap steel baking device. This ensures that the scrap steel baking device is not damaged during scrap steel feeding; it maintains the strength of the furnace body under high-temperature flue gas conditions; it allows for convenient switching of the scrap steel baking furnace body according to the production rhythm; it collects the exhaust gas, treats it with dust, and then discharges it into the atmosphere; it effectively insulates the equipment and ensures low energy consumption. The medium-frequency furnace scrap steel baking device provided by this invention is equipped with an air preheater. The exhaust gas preheats the combustion gas through the air preheater, significantly increasing the temperature of the combustion gas and the flame temperature, reducing high-temperature gas emissions, and improving the utilization rate of blast furnace gas, thereby reducing blast furnace gas consumption and carbon emissions.

[0026] In addition, the four burners are arranged in two layers, one above the other, and tangentially around the circumference to ensure that the hot air inside the baking furnace forms a swirling flow, which improves the penetration of the hot air, makes the scrap steel heat evenly, and makes the baking speed fast, ensuring that 2 tons of scrap steel can be baked to above 500°C in about 10 minutes. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0028] Figure 1 This is a schematic diagram of a medium-frequency furnace scrap steel baking device in Embodiment 1 of the present invention.

[0029] Figure 2 This is a schematic diagram of the scrap steel baking mechanism of the present invention.

[0030] Figure 3 This is a schematic diagram of the lifting assembly of the present invention.

[0031] Figure 4 This is an enlarged schematic diagram of the compartment cover of the present invention.

[0032] Figure 5 This is an enlarged schematic diagram of the baking chamber.

[0033] Figure 6 This is an enlarged schematic diagram of the locking assembly.

[0034] Figure 7 This is an enlarged schematic diagram of a gas pipeline assembly.

[0035] Figure 8 This is an enlarged schematic diagram of the air duct assembly and the induced draft duct assembly.

[0036] In the diagram: 1. Lifting assembly, 2. Silo cover, 3. Lifting assembly bracket, 4. Baking silo, 5. Burner, 6. Hydraulic push rod, 7. Locking assembly, 8. Support platform, 9. Gas pipeline assembly, 10. Exhaust fan pipeline assembly, 11. Air pipeline assembly, 101. Hanger, 102. Electric hoist, 103. Manganese steel chain, 104. Drive motor, 105. Traveling support, 201. Channel steel, 202. Baking silo cover shell, 203. Lifting lug, 204. Lifting lug, 205. Stainless steel hook, 206. Lightweight castable, 401. Scrap steel hopper, 402. M16 high-strength bolt, 403. Burner base, 404. Lightweight castable, 405. Furnace body, 406. M24 high-strength bolts, 407. Furnace body base, 408. Scrap steel unloading door lifting lugs, 409. Fasteners, 410. Scrap steel unloading door, 411. Hydraulic push rod fixing parts, 701. Locking plate, 702. Support base, 703. Hex socket head cap screws, 704. Front flange type hydraulic cylinder, 901. Gas pipeline, 902. Manual butterfly valve, 903. Gas pressure transmitter, 904. Gas quick-cut valve C, 905. Gas electric regulating valve, 906. Gas flow meter, 907. Gas branch pipe A, 908. Gas quick-cut valve A, 909. Gas quick-cut valve B, 910. Gas branch pipe B, 1001. Exhaust pipe, 1002. Air preheater, 1101. Blower, 1102. Flexible connection, 1103. Air-operated regulating valve, 1104. Air circuit, 1105. Air branch pipe A, 1106. Air quick-cut valve A, 1107. Air quick-cut valve B, 1108. Air branch pipe B. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings, but the present invention is not limited to the following embodiments. Example

[0038] A medium-frequency furnace scrap baking device, such as Figures 1-8 As shown, it includes a scrap steel baking mechanism; the scrap steel baking mechanism is set on a support platform 8, and the scrap steel baking mechanism is also connected to a gas pipeline assembly 9 and an air pipeline assembly 11 respectively. The air pipeline assembly 11 is connected to an induced draft pipeline assembly 10. The scrap steel baking mechanism includes a lifting assembly 1, a bin cover 2, and a baking bin 4 arranged sequentially from top to bottom; the lifting assembly 1 is set on the support platform 8 through a lifting assembly bracket 3, the bin cover 2 is set on the lifting assembly 1, and the baking bin 4 is set on the support platform 8, with four burners 5 inserted around the outer periphery of each baking bin 4; the four burners 5 are arranged in two layers, upper and lower, and circumferentially on the baking bin 4; a guide assembly is set between the lifting assembly 1 and the lifting assembly bracket 3 to allow the lifting assembly 1 to move left and right in the horizontal direction of the lifting assembly bracket 3.

[0039] The lifting assembly 1 includes a traveling support 105, with an electric hoist 102 mounted on top of the traveling support 105. The electric hoist 102 is fixed to the traveling support 105 via a hanger 101. The traveling support 105 has casters at its four corners. Two casters on the same side are connected by bearings. Each caster on each side is equipped with a separate drive motor 104, whose output is connected to the caster for driving. The traveling support 105 also has two manganese steel chains 103 mounted on top of it, respectively on both sides of the electric hoist 102.

[0040] The guiding assembly consists of a track on the lifting assembly bracket 3 and casters on the lifting assembly 1.

[0041] The silo cover 2 includes a baking silo cover shell 202. A lifting lug 204 is provided at the center of the top of the baking silo cover shell 202, and the lifting lug 204 is connected to an electric hoist 102. Lifting lugs 203 are provided on both sides of the lifting lug 204, and the two lifting lugs 203 are respectively connected to manganese steel chains 103. Several stainless steel hooks 205 and lightweight castable refractory 206 are provided inside the baking silo cover shell 202. Channel steel 201 is also provided on both sides of the baking silo cover shell 202. The stainless steel hooks 205 are welded to the inside of the baking silo cover shell 202, and then the lightweight castable refractory 206 is poured into the baking silo cover shell 202.

[0042] The lifting assembly 1, under the action of the electric hoist 102, achieves vertical lifting of the bin cover 2 by 100mm. The lifting assembly 1, under the action of the drive motor 104, achieves horizontal movement.

[0043] The baking chamber 4 includes a furnace body 405. A scrap steel hopper 401 is provided at the top of the furnace body 405, and a furnace body base 407 and a scrap steel discharge door 410 are provided at the bottom of the furnace body 405. The scrap steel discharge door 410 is connected to the furnace body 405 through a scrap steel discharge door lifting lug 408. Lightweight castable material 404 is provided on the inner wall of the furnace body 405. A burner base 403 is provided at the connection between the furnace body 405 and the burner 5. The furnace body base 407 is provided with a discharge channel. The scrap steel discharge door 410 is located below the furnace body base 407. The scrap steel discharge door 410 is divided into two discharge doors, left and right. Each discharge door is equipped with a hydraulic push rod 6 and a locking assembly 7. The discharge door is moved by the hydraulic push rod 6 through the locking assembly 7 to achieve telescopic movement and open and close the discharge door.

[0044] The scrap steel hopper 401 is fixed to the furnace body 405 by M16 high-strength bolts 402. The furnace body 405 is connected to the furnace base 407 by M24 high-strength bolts 406. The scrap steel discharge gate 410 is connected and fixed to the scrap steel discharge gate lifting lug 408 by fasteners 409. The scrap steel discharge gate lifting lug 408 is welded to the furnace body 405. The front end of the hydraulic push rod 6 is connected to the discharge gate by a hydraulic push rod fixing piece 411.

[0045] The number of locking components (7) matches the number of hydraulic push rods (6). Each locking component (7) includes a front-mounted flange-type hydraulic cylinder (704). The front end of the hydraulic rod of the front-mounted flange-type hydraulic cylinder (704) is connected to a locking plate (701), which is connected to the bottom of the hydraulic push rod (6). The front-mounted flange-type hydraulic cylinder (704) is fixed to the support platform (8) via a support base (702) and hexagonal socket head cap bolts (703). The locking plate (701) and the front-mounted flange-type cylinder (704) are connected by threads.

[0046] Gas pipeline assembly 9 is connected to each burner 5, air pipeline assembly 11 is connected to each burner 5, and induced draft pipeline assembly 10 is connected to the baking chamber 4.

[0047] Two sets of scrap steel baking mechanisms are preferred.

[0048] The gas pipeline assembly 9 includes a gas pipeline 901, on which a manual butterfly valve 902, a gas pressure transmitter 903, a gas quick-cut valve C 904, a gas electric regulating valve 905, and a gas flow meter 906 are sequentially installed. Gas branch pipes A 907 and B 910 are connected to the left and right ends of the gas pipeline 901, respectively. A gas quick-cut valve A 908 is installed on gas branch pipe A 907, and a gas quick-cut valve B 909 is installed on gas branch pipe B 910. Each gas branch pipe A 907 and gas branch pipe B 910 connects to several gas sub-pipes, the total number of which matches the number of burners 5. Gas branch pipes A 907 and B 910 are connected to burners 5 of different scrap steel baking mechanisms.

[0049] The air piping assembly 11 includes an air duct. A blower 1101 is installed at the front end of the air duct. An electric air regulating valve 1103 and an air preheater 1002 are sequentially installed on the air duct. The air preheater 1002 is connected to an air duct 1104 at its end. Air branch pipes A 1105 and B 1108 are respectively connected to the left and right sides of the end of the air duct 1104. An air quick-cut valve A 1106 is installed on air branch pipe A 1105, and an air quick-cut valve B 1107 is installed on air branch pipe B 1108. Each air branch pipe A 1105 and air branch pipe B 1108 is connected to several air sub-pipes, and the total number of air sub-pipes is consistent with the number of burners 5. Air branch pipes A 1105 and air branch pipe B 1108 are respectively connected to burners 5 of different scrap steel baking mechanisms.

[0050] The induced draft duct assembly 10 includes an induced draft duct 1001, the front end of which is connected to the furnace body 405, and the end of which is connected to an external dust collector via a pipe. The front end of the induced draft duct 1001 is connected to an air preheater 1002 on an air duct.

[0051] The blower 1101 is connected to the front end of the air duct by a flexible connection 1102.

[0052] The lightweight castable 206 and lightweight castable 404 are commercially available products.

[0053] The furnace body 405 is integrally cast from high-temperature resistant cast iron. The baking chamber 4 is welded to the support platform 8. The lifting assembly bracket 3 and the support platform 8 are welded from profiles.

[0054] The burner 5 is a scrap steel preheating spray gun (CN212339244U), and each burner 5 is equipped with an automatic igniter and a flame detector.

[0055] Gas pipeline 901 can also be connected to nitrogen purging pipeline.

[0056] The device is also equipped with a PLC control system. The electric hoist 102, drive motor 104, front flange hydraulic cylinder 704, gas pressure transmitter 903, gas quick-cut valve C 904, gas electric regulating valve 905, gas flow meter 906, gas quick-cut valve A 908, gas quick-cut valve B 909, air preheater 1002, blower 1101, air electric regulating valve 1103, air quick-cut valve A 1106, air quick-cut valve B 1107, burner 5, automatic igniter, and flame detector are all connected to the PLC control system and are all limited to a specific model to realize their working functions.

[0057] Two sets of scrap steel baking mechanisms are provided, arranged on the left and right sides. During the operation of the medium-frequency furnace scrap steel baking device, the scrap steel baking mechanism can operate in single-set or simultaneous operation, switching back and forth according to the production rhythm of the medium-frequency furnace. Before use, the scrap steel baking chamber 4's furnace body 405 is raised and lowered by the lifting assembly 1 to ensure the scrap steel baking chamber cover 2 is not directly above the furnace body 405. Scrap steel is then added to the furnace body 405 of the scrap steel baking chamber 4 using a magnetic crane (other transport equipment, not protected by this invention, but a commercially available product). During scrap steel baking, the lifting assembly 1 raises and lowers the scrap steel baking chamber cover 2 to ensure it is directly above the furnace body 405, guaranteeing the heat insulation of the furnace body 405 and ensuring that the generated exhaust gas is treated by a dust collector before being discharged into the atmosphere. To reduce damage to the hydraulic push rod 6 caused by scrap steel entering the furnace body 405 of the scrap steel baking chamber 4, a locking assembly 7 is configured. Before loading scrap steel, the scrap steel discharge door 410 is locked by the locking assembly 7; before unloading scrap steel, the scrap steel discharge door 410 is opened by the locking assembly 7. The switching of the furnace body 405 of the scrap steel baking chamber 4 is controlled by the gas quick-cut valve and air quick-cut valve in the gas pipeline assembly 9 and air pipeline assembly 11. When both scrap steel baking mechanisms are operating simultaneously, gas quick-cut valve C 904, gas electric regulating valve 905, gas quick-cut valve A 908, gas quick-cut valve B 909, air electric regulating valve 1103, air quick-cut valve A 1106, and air quick-cut valve B 1107 are all open. When only the left scrap steel baking mechanism is operating, gas quick-cut valve C 904, gas electric regulating valve 905, gas quick-cut valve A 908, air electric regulating valve 1103, and air quick-cut valve A 1106 are all open, while gas quick-cut valve B 909 and air quick-cut valve B 1107 are simultaneously closed. When only the other scrap steel baking mechanism is operating, gas quick-cut valve C 904, gas electric regulating valve 905, gas quick-cut valve B 909, air electric regulating valve 1103, and air quick-cut valve B 1107 are all open, while gas quick-cut valve A 909 is closed. 908. Air quick-cut valve A 1106 are closed simultaneously.

[0058] The scrap steel is heated to 500℃ using blast furnace gas, and then fed into an induction furnace for smelting. Heating one ton of scrap steel to 500℃ using an induction furnace costs 52.3 yuan in electricity. Heating one ton of scrap steel to 500℃ using blast furnace gas costs 28.5 yuan in blast furnace gas. Using blast furnace gas for heating the scrap steel saves 23.8 yuan per ton of scrap steel.

[0059] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A medium-frequency furnace scrap baking device, characterized in that, The scrap steel baking mechanism is set on a support platform (8). The scrap steel baking mechanism is also connected to a gas pipeline assembly (9) and an air pipeline assembly (11). The air pipeline assembly (11) is connected to an exhaust pipe assembly (10). The scrap steel baking mechanism includes a lifting assembly (1), a bin cover (2), and a baking bin (4) arranged sequentially from top to bottom. The lifting assembly (1) is set on the support platform (8) through a lifting assembly bracket (3). The bin cover (2) is set on the lifting assembly (1). The baking bin (4) is set on the support platform (8). Each baking bin (4) has four burners (5) inserted around its outer periphery. The four burners (5) are arranged in two layers, upper and lower, and circumferentially on the baking bin (4). A guide assembly is set between the lifting assembly (1) and the lifting assembly bracket (3) to allow the lifting assembly (1) to move left and right in the horizontal direction of the lifting assembly bracket (3). The lifting assembly (1) includes a traveling support (105), an electric hoist (102) is installed on the top of the traveling support (105), the electric hoist (102) is fixed on the traveling support (105) by a hanger (101), the four corners of the bottom of the traveling support (105) are provided with casters, two casters on the same side are connected by bearings, and one of the casters on each side is equipped with a separate drive motor (104), the output end of the drive motor (104) is connected to the caster to realize drive; the top of the traveling support (105) is also provided with two manganese steel chains (103) and respectively set on both sides of the electric hoist (102); The guiding assembly consists of a track set on the lifting assembly bracket (3) and casters on the lifting assembly (1); The silo cover (2) includes a baking silo cover shell (202), a lifting lug (204) is provided at the top center of the baking silo cover shell (202), the lifting lug (204) is connected to an electric hoist (102); lifting lugs (203) are provided on both sides of the lifting lug (204), and the two lifting lugs (203) are respectively connected to manganese steel chains (103); channel steel (201) is also provided on both sides of the baking silo cover shell (202); The baking chamber (4) includes a furnace body (405), a scrap steel hopper (401) is provided at the top of the furnace body (405), a furnace body base (407) and a scrap steel discharge door (410) are provided at the bottom of the furnace body (405), and the scrap steel discharge door (410) is connected to the furnace body (405) through a scrap steel discharge door lifting lug (408); a burner base (403) is provided at the connection between the furnace body (405) and the burner (5); the furnace body base (407) is provided with a discharge channel, and the scrap steel discharge door (410) is located below the furnace body base (407). The scrap steel discharge door (410) is divided into two discharge doors, left and right. Each of the two discharge doors is equipped with a hydraulic push rod (6) and a locking assembly (7). The discharge door is moved by the hydraulic push rod (6) through the locking assembly (7) to achieve telescopic movement and drive the discharge door to open and close. The air duct assembly (11) includes an air duct, with a blower (1101) installed at the front end of the air duct. An air electric regulating valve (1103) and an air preheater (1002) are installed sequentially on the air duct. The air preheater (1002) is connected to the air duct (1104) at the end. Air branch pipes A (1105) and B (1108) are respectively connected to the left and right sides of the end of the air duct (1104). An air quick-cut valve A (1106) is installed on the air branch pipe A (1105), and an air quick-cut valve B (1107) is installed on the air branch pipe B (1108). Each of the air branch pipes A (1105) and B (1108) is connected to several air sub-pipes. The total number of air sub-pipes is consistent with the number of burners (5). The air branch pipes A (1105) and B (1108) are respectively connected to the burners (5) of different scrap steel baking mechanisms.

2. The medium-frequency furnace scrap baking device as described in claim 1, characterized in that, The number of locking components (7) is the same as the number of hydraulic push rods (6). The locking components (7) include a front flange type hydraulic cylinder (704). The front end of the hydraulic rod of the front flange type hydraulic cylinder (704) is connected to a locking plate (701). The locking plate (701) is connected to the bottom of the hydraulic push rod (6). The front flange type hydraulic cylinder (704) is fixed on the support platform (8) by a support seat (702) and internal hex bolts (703).

3. The medium-frequency furnace scrap baking device as described in claim 2, characterized in that, Gas pipeline assembly (9) is connected to each burner (5) respectively, air pipeline assembly (11) is connected to each burner (5) respectively, and induced draft pipeline assembly (10) is connected to the baking chamber (4); air pipeline assembly (11) is connected to each burner (5) respectively, and induced draft pipeline assembly (10) is connected to the baking chamber (4).

4. The medium-frequency furnace scrap baking device as described in claim 3, characterized in that, Two sets of scrap steel baking mechanisms are set up.

5. The medium-frequency furnace scrap baking device as described in claim 4, characterized in that, The gas pipeline assembly (9) includes a gas pipeline (901), on which a manual butterfly valve (902), a gas pressure transmitter (903), a gas quick-cut valve C (904), a gas electric regulating valve (905), and a gas flow meter (906) are installed in sequence. Gas branch pipes A (907) and B (910) are also connected to the left and right sides of the gas pipeline (901) respectively. Gas quick-cut valve A (908) is installed on gas branch pipe A (907), and gas quick-cut valve B (909) is installed on gas branch pipe B (910). Gas branch pipes A (907) and B (910) are each connected to several gas branch pipes. The total number of gas branch pipes is consistent with the number of burners (5). Gas branch pipes A (907) and B (910) are respectively connected to burners (5) of different scrap steel baking mechanisms.

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