Energy-saving intermediate frequency furnace

Abstract

The application discloses an energy-saving medium-frequency furnace and relates to the technical field of medium-frequency furnaces.The energy-saving medium-frequency furnace comprises a furnace frame, the top of the furnace frame is provided with a swingable furnace plate, the furnace plate is swung to the right to unload, the inside of the furnace plate is provided with a medium-frequency furnace, the top of the furnace plate is provided with a swingable furnace cover, the furnace cover is swung to the left to open, the top of the furnace cover is provided with a feeding opening, the top end of the feeding opening is obliquely arranged to the right, the top of the furnace cover is provided with a support, and the bottom of the right end of the support is provided with a furnace charge preheating assembly. Through the arrangement of the three-section stepped shaft-shaped furnace charge cylinder and the arrangement of the magnetic adsorption assembly, in the process of conveying the furnace charge, the light and thin furnace charge is adsorbed in the right section furnace charge cylinder, the section contacts the medium-low temperature flue gas flowing from the tail end; the small pieces of furnace charge are adsorbed in the middle section furnace charge cylinder, the flue gas temperature of the section is higher; and the large pieces of furnace charge enter the left section furnace charge cylinder, the section directly faces the original flue gas with the highest temperature, and the preheating effect is good.

Description

Technical Field

[0001] This invention relates to the field of medium-frequency furnace technology, and specifically to an energy-saving medium-frequency furnace. Background Technology

[0002] Medium-frequency induction furnaces, as core smelting equipment in the casting and special metallurgical industries, have advantages such as fast heating speed, precise temperature control, and uniform metal composition. However, during their smelting process, especially in the cold charge melting stage, there is a common and prominent energy efficiency bottleneck: a large amount of electrical energy is consumed in heating the room-temperature solid charge (mainly scrap steel) to its melting temperature.

[0003] Chinese patent (publication number: CN119436859A) discloses a furnace charge preheating heat treatment process, including a furnace charge preheating heat treatment device, which includes an intermediate frequency furnace, an intermediate frequency furnace platform, and a vibrating conveyor and an oxygen-enriched combustion preheating device disposed on the intermediate frequency furnace platform. The vibrating conveyor is provided with a feeding trolley that can move laterally on it. The feeding trolley includes a car body with an upper opening and a vibrating motor disposed on the car body. The car body includes a trough for accommodating the furnace charge. The intermediate frequency furnace is disposed at the discharge port of the vibrating conveyor. The heat treatment steps are as follows: S1. The furnace charge is added to the feeding trolley on the platform of the medium frequency furnace. The feeding trolley is vibrated to make the furnace charge spread out flat. S2. The feeding trolley is transferred to the oxygen-enriched combustion preheating device by the vibrating conveyor on the medium frequency furnace platform so as to preheat the flat furnace charge. S3. The feeding trolley is transferred to the discharge port by the vibrating conveyor on the medium frequency furnace platform, and the furnace charge is placed into the medium frequency furnace for smelting.

[0004] The patent and existing technologies have the following technical problems in practical use: 1. The furnace charge is laid flat and stationary in the trolley. Only the upper layer of charge can be directly exposed to flame radiation and convection. The lower and middle layers of charge mainly rely on heat conduction to slowly heat up, which easily leads to a serious temperature unevenness phenomenon of "hot on top and cold on the bottom, hot on the outside and cold on the inside".

[0005] 2. Currently, medium-frequency induction furnaces frequently use scrap steel, which has a complex composition (light and thin scrap, briquettes, large heavy scrap, steel wire cuts, etc.), with significant differences in bulk density, permeability, and specific surface area. A single preheating method is insufficient to uniformly heat all types of scrap. Light and thin scrap is easily blown away, while large scrap is difficult to heat thoroughly. Summary of the Invention

[0006] The purpose of this invention is to provide an energy-saving medium-frequency furnace in order to solve the above-mentioned problems.

[0007] To achieve the above objectives, the present invention specifically adopts the following technical solution: An energy-saving medium-frequency furnace includes a furnace frame, a swingable furnace plate on the top of the furnace frame, which unloads material when it swings to the right, a medium-frequency furnace is installed inside the furnace plate, a swingable furnace cover on the top of the furnace plate, which opens when it swings to the left, a feeding port on the top of the furnace cover, the top of the feeding port is tilted to the right, and a support is provided on the top of the furnace cover. A preheating assembly for the furnace charge is provided at the bottom of the right end of the support. The preheating assembly for the furnace charge includes an outer cylinder fixedly installed at the bottom of the right end of the support. A furnace charge cylinder is rotatably installed inside the outer cylinder. The furnace charge cylinder is rotatably sealed with the charging port. The furnace charge cylinder is arranged in a three-section stepped shaft shape, and the radius increases from right to left. A magnetic adsorption assembly is sleeved on the furnace charge cylinder. Several first magnetic blocks and second magnetic blocks are arranged in a ring inside the magnetic adsorption assembly. The magnetic force of the second magnetic block is greater than that of the first magnetic block. The first magnetic block can fit with the right side section of the furnace charge cylinder, and the second magnetic block can fit with the middle section of the furnace charge cylinder. The right side of the furnace charge preheating assembly is equipped with a liftable feeding hopper and a flue pipe.

[0008] Furthermore, a base is provided on the right side of the furnace charge preheating component. The base is installed on the ground, and a slide block is slidably connected to the base. A sliding hydraulic cylinder is provided on the right side of the base. The telescopic end of the sliding hydraulic cylinder is connected to the slide block. A lifting frame is slidably connected to the top of the slide block. The feeding hopper and the exhaust pipe are both fixedly installed on the lifting frame, and the feeding hopper is located above the exhaust pipe. A lifting hydraulic cylinder is fixedly installed on the outside of the slide block, and the telescopic end of the lifting hydraulic cylinder is connected to the lifting frame.

[0009] Furthermore, both the feeding hopper and the exhaust pipe are provided with plug-in ends on their left sides, which can be plugged into the furnace charge cylinder.

[0010] Furthermore, a discharge hydraulic cylinder is hinged to the inner side of the furnace frame, and the telescopic end of the discharge hydraulic cylinder is hinged to the furnace plate.

[0011] Furthermore, an opening hydraulic cylinder is hinged to the outer side of the furnace plate, and the telescopic end of the opening hydraulic cylinder is hinged to the furnace cover.

[0012] Furthermore, a three-phase asynchronous motor is installed on the top of the support, a drive wheel is installed at the output end of the three-phase asynchronous motor, a transmission wheel is rotatably installed inside the support, and an external gear ring is provided on the outer side of the furnace charge cylinder, with the transmission wheel meshing between the drive wheel and the external gear ring.

[0013] Furthermore, the magnetic adsorption assembly includes a frame fitted onto the furnace charge cylinder, the frame being correspondingly arranged with the right side section and the middle section of the furnace charge cylinder, a first magnetic block and a second magnetic block being arranged inside the frame, a sliding opening being provided at the top of the outer cylinder, a supporting collar being slidably connected in the sliding opening, the frame being rotatably installed in the supporting collar, and a telescopic hydraulic cylinder being fixedly installed at the bottom of the bracket, the telescopic end of the telescopic hydraulic cylinder being connected to the supporting collar; The first and second magnetic blocks are electromagnets, and their outer surfaces are protected by water-cooling jackets to prevent high-temperature demagnetization and damage. Cooling pipes are provided on the outside of the frame to connect the external water-cooling system to the water-cooling jacket.

[0014] Furthermore, the right end of the furnace charge cylinder is tilted upwards at 5-10°.

[0015] Furthermore, the furnace charge cylinder is horizontally arranged, with a first spiral guide component installed inside the right side section of the furnace charge cylinder and a second spiral guide component installed inside the middle section of the furnace charge cylinder.

[0016] Furthermore, the pitch of the first spiral guide is greater than the pitch of the second spiral guide, and the second spiral guide has smoke-passing mesh holes.

[0017] The beneficial effects of this invention are as follows: 1. This invention, through the arrangement of a three-stage stepped axial furnace charge cylinder and the combination of a magnetic adsorption component, classifies the furnace charge during the conveying process. Lightweight and thin materials are adsorbed in the right-side charge cylinder, where they come into contact with the low-temperature flue gas (300-500℃) flowing in from the tail end. This is ideal for low-temperature degreasing and dehydration of lightweight materials, while preventing them from being carried away by the high-speed airflow. Small pieces are adsorbed in the middle charge cylinder, where the flue gas temperature is higher (500-800℃), and the moderate residence time ensures that small and medium-sized pieces are fully and evenly heated. Large pieces enter the left-side charge cylinder, where they directly face the highest temperature original flue gas (800-1200℃). The high temperature, relatively short time, and intense thermal shock effectively cleans the surface of large pieces and rapidly raises their temperature. At the same time, due to their rapid passage, high-temperature oxidation and burning losses are reduced.

[0018] 2. The present invention achieves full process automation by setting up a liftable feeding hopper and a flue pipe. During feeding, the feeding hopper is connected to the furnace charge cylinder, and during flue gas preheating, the flue pipe is connected to the furnace charge cylinder.

[0019] 3. By setting up a stepped axial magnetic adsorption component, the first magnetic block is far away from the furnace charge cylinder during the flue gas preheating process, and the second magnetic block is located on the right side of the furnace charge cylinder and does not contact the right side of the furnace charge cylinder. This ensures that the light and thin furnace charge can be adsorbed and prevented from being carried away by the flue gas, while reducing the impact of high temperature on the magnetism of the second magnetic block, and the equipment operates stably. Attached Figure Description

[0020] Figure 1 This is an overall schematic diagram of the invention; Figure 2 This is a schematic diagram of the intermediate frequency furnace structure of the present invention; Figure 3 This is a schematic diagram of the lifting structure of the feeding hopper and exhaust pipe of the present invention; Figure 4 This is a three-dimensional structural diagram of the furnace charge preheating component of the present invention; Figure 5 This is a cross-sectional view of the furnace charge preheating assembly of the present invention; Figure 6 This is an exploded view of the furnace charge preheating assembly of the present invention; Figure 7 This is a schematic diagram of the magnetic adsorption component structure of the present invention.

[0021] Reference numerals: 1. Furnace frame; 2. Furnace plate; 3. Medium frequency furnace; 4. Unloading hydraulic cylinder; 5. Furnace cover; 51. Feed port; 6. Opening hydraulic cylinder; 7. Support; 71. Drive wheel; 72. Transmission wheel; 8. Furnace charge preheating assembly; 81. Outer cylinder; 82. Furnace charge cylinder; 83. Outer toothed ring; 84. First spiral guide; 85. Second spiral guide; 86. Magnetic adsorption assembly; 861. Frame; 862. First magnetic block; 863. Second magnetic block; 864. Cooling pipe; 87. Telescopic hydraulic cylinder; 88. Support collar; 9. Feed hopper; 10. Exhaust pipe; 11. Base; 12. Slide seat; 13. Sliding hydraulic cylinder; 14. Lifting frame; 15. Lifting hydraulic cylinder. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0023] Example 1 like Figures 1-7 As shown, an energy-saving medium-frequency furnace includes a furnace frame 1, a swingable furnace plate 2 on the top of the furnace frame 1, which unloads material when it swings to the right, a medium-frequency furnace 3 is installed inside the furnace plate 2, a swingable furnace cover 5 on the top of the furnace plate 2, which opens when it swings to the left, a feeding port 51 is opened on the top of the furnace cover 5, the top of the feeding port 51 is tilted to the right, and a bracket 7 is provided on the top of the furnace cover 5. A preheating assembly 8 is provided at the bottom right end of the support 7. The preheating assembly 8 includes an outer cylinder 81 fixedly installed at the bottom right end of the support 7. A charge cylinder 82 is rotatably installed inside the outer cylinder 81. The charge cylinder 82 is rotatably sealed with the charging port 51. The charge cylinder 82 is arranged in a three-section stepped shaft shape, and the radius increases from right to left. A magnetic adsorption assembly 86 is sleeved on the charge cylinder 82. Several first magnetic blocks 862 and second magnetic blocks 863 are arranged in a ring inside the magnetic adsorption assembly 86. The magnetic force of the second magnetic block 863 is greater than that of the first magnetic block 862. The first magnetic block 862 can fit with the right side section of the charge cylinder 82, and the second magnetic block 863 can fit with the middle section of the charge cylinder 82. The right side of the furnace charge preheating assembly 8 is equipped with a liftable charging hopper 9 and a flue pipe 10.

[0024] Preferably, a base 11 is provided on the right side of the furnace charge preheating component 8. The base 11 is installed on the ground. A slide block 12 is slidably connected to the base 11. A sliding hydraulic cylinder 13 is provided on the right side of the base 11. The telescopic end of the sliding hydraulic cylinder 13 is connected to the slide block 12. A lifting frame 14 is slidably connected to the top of the slide block 12. The feeding hopper 9 and the exhaust pipe 10 are both fixedly installed on the lifting frame 14, and the feeding hopper 9 is located above the exhaust pipe 10. A lifting hydraulic cylinder 15 is fixedly installed on the outside of the slide block 12. The telescopic end of the lifting hydraulic cylinder 15 is connected to the lifting frame 14.

[0025] Preferably, both the feeding hopper 9 and the exhaust pipe 10 are provided with plug-in ends on their left ends. The plug-in ends can be plugged into the furnace charge cylinder 82. By providing the plug-in ends, the tightness of the connection between the feeding hopper 9 and the exhaust pipe 10 and the furnace charge cylinder 82 is improved.

[0026] Preferably, a discharge hydraulic cylinder 4 is hinged to the inner side of the furnace frame 1, and the telescopic end of the discharge hydraulic cylinder 4 is hinged to the furnace plate 2.

[0027] Preferably, an opening hydraulic cylinder 6 is hinged to the outer side of the furnace plate 2, and the telescopic end of the opening hydraulic cylinder 6 is hinged to the furnace cover 5.

[0028] Preferably, a three-phase asynchronous motor is mounted on the top of the bracket 7, a drive wheel 71 is mounted on the output end of the three-phase asynchronous motor, a transmission wheel 72 is rotatably mounted inside the bracket 7, and an external gear ring 83 is provided on the outer side of the furnace charge cylinder 82. The transmission wheel 72 meshes between the drive wheel 71 and the external gear ring 83. The three-phase asynchronous motor is isolated from the high-temperature heat source, operates stably, and can be additionally equipped with a heat insulation sleeve according to the actual environment. The three-phase asynchronous motor facilitates the control of the forward and reverse rotation of the furnace charge cylinder 82.

[0029] Preferably, the right end of the furnace charge cylinder 82 is tilted upward at 5-10°.

[0030] The furnace charge cylinder 82 adopts a composite cylinder structure. The right and middle sections use 310S austenitic stainless steel as the base material. The austenitic structure is "non-ferromagnetic" or "weakly paramagnetic," making it extremely difficult to magnetize, fundamentally eliminating residual magnetism and ensuring low magnetization. The left section uses ZG35Cr26Ni12 heat-resistant cast steel, which has excellent resistance to high-temperature oxidation and high-temperature strength, and can withstand the impact of large pieces of material.

[0031] This embodiment uses an inclined furnace cylinder 82 to classify materials by gravity. Feeding: The lifting hydraulic cylinder 15 drives the lifting frame 14 to rise, and the lifting frame 14 drives the feeding hopper 9 to the position of the furnace charge cylinder 82. Then, the sliding hydraulic cylinder 13 drives the sliding block 12 to slide to the left (in this embodiment, the tilt angle of the sliding trajectory of the sliding block 12 is the same as the tilt angle of the furnace charge cylinder 82). The plug end of the feeding hopper 9 is inserted into the furnace charge cylinder 82. A scrap steel conveying line can be set above the feeding hopper 9 or a hoisting method can be used to put the scrap steel from the feeding hopper 9 into the furnace charge cylinder 82. At the same time, the three-phase asynchronous motor drives the drive wheel 71 to rotate. The drive wheel 71 drives the furnace charge cylinder 82 to rotate through the transmission wheel 72 and the external gear ring 83. The tilted furnace charge cylinder 82 rotates, causing the scrap steel to move to the left along the furnace charge cylinder 82 under the action of gravity. During this process, the light and thin furnace charge is first magnetic block 86 Under the action of the second magnetic block 863, the small pieces of material are adsorbed onto the inner wall of the right section of the furnace charge 82. The large pieces enter the left section of the furnace charge 82. The furnace charge is temporarily stored in the furnace charge 82. After a sufficient amount of furnace charge is fed, the magnetic adsorption component 86 is controlled to slide to the right. The first magnetic block 862 moves away from the furnace charge 82, and the second magnetic block 863 moves to the right section of the furnace charge 82. Since the furnace charge 82 is arranged in a three-section stepped shaft shape, there is a gap between the second magnetic block 863 and the right section of the furnace charge 82. Moreover, the magnetic force of the second magnetic block 863 is greater than that of the first magnetic block 862. Therefore, even with the gap, the light and thin furnace charge is still adsorbed onto the inner wall of the right section of the furnace charge 82, ensuring that it will not be carried away by the flue gas.

[0032] Preheating: Under the action of the lifting frame 14 and the sliding seat 12, the exhaust pipe 10 is connected to the furnace charge cylinder 82. The medium-frequency furnace 3, which has been filled with scrap steel, is started to refine the scrap steel. The generated high-temperature flue gas passes through the furnace charge cylinder 82 from left to right. During the process, the large pieces of furnace charge in the left section of the furnace charge cylinder 82 directly face the highest temperature original flue gas (800-1200℃). The high temperature, relatively short time, and strong thermal shock can effectively clean the surface of the large pieces of material and make them heat up quickly. At the same time, due to its rapid passage, high-temperature oxidation loss is reduced. The small pieces of furnace charge in the middle section of the furnace charge cylinder 82 face the flue gas temperature of higher temperature (500-800℃). The medium residence time allows the small and medium pieces of material to be fully and evenly heated. The light and thin materials in the right section of the furnace charge cylinder 82 face the medium and low temperature flue gas (300-500℃), which is very suitable for low-temperature degreasing and dehydration of light and thin materials, while avoiding them being carried away by the high-speed airflow. After the scrap steel refining in the intermediate frequency furnace 3 is completed, the furnace charge in the furnace charge cylinder 82 is also preheated.

[0033] Charging: After the furnace charge is refined, the exhaust pipe 10 is separated from the charge cylinder 82. The unloading hydraulic cylinder 4 and the cover-opening hydraulic cylinder 6 operate simultaneously. The unloading hydraulic cylinder 4 drives the induction furnace 3 to swing to the right via the furnace plate 2, while the cover-opening hydraulic cylinder 6 drives the furnace cover 5 to swing to the left relative to the furnace plate 2, ensuring the furnace cover 5 remains in its original position and maintaining stability of the raw material in the charge cylinder 82. After the molten steel in the induction furnace 3 is poured out, the angle between the furnace cover 5 and the induction furnace 3 is approximately 90°. The unloading hydraulic cylinder 4 drives the induction furnace 3 to reset. During this process, the angle between the furnace cover 5 and the induction furnace 3 remains unchanged. Therefore, after the induction furnace 3 resets, the charge cylinder 82 is vertically upward, and the charge within is directly poured into the induction furnace 3, completing the automatic charging process. Then, the furnace cover 5 is closed, and the next batch of charge to be refined is added to the charge cylinder 82. The entire process is automated and requires no manual intervention.

[0034] Example 2 The furnace charge cylinder 82 is horizontally positioned. A first spiral guide 84 is installed inside the right side section of the furnace charge cylinder 82, and a second spiral guide 85 is installed inside the middle section of the furnace charge cylinder 82.

[0035] Preferably, the pitch of the first spiral guide 84 is greater than the pitch of the second spiral guide 85, and the second spiral guide 85 has smoke-passing mesh holes. The smoke-passing mesh holes prevent the second spiral guide 85 from excessively obstructing the flue gas, thus preventing small pieces of furnace charge from being fully preheated.

[0036] In this embodiment, the furnace charge cylinder 82 is horizontally positioned. The scrap steel is propelled by the spiral force generated by the first spiral guide 84 and the second spiral guide 85. Although the structure is slightly more complex than that of the first embodiment, the horizontal conveying and the tumbling of the scrap steel during the conveying process allow for better separation of the lighter and thinner pieces of the large charge, resulting in more stable and controllable classification. Simultaneously, the two spiral guides block the charge as the magnetic adsorption assembly 86 moves relative to the furnace charge cylinder 82, preventing the charge from piling up. Furthermore, the large conveying distance and steep inclination angle of the first spiral guide 84 allow the lighter and thinner charge to adhere more easily to its surface. This not only improves the initial conveying efficiency but also, during subsequent preheating, the movement of the magnetic adsorption assembly 86 causes the lighter and thinner charge to adhere to the first spiral guide 84. The flue gas directly impacts the first spiral guide 84, indirectly preheating the lighter and thinner charge. This further prevents the lighter and thinner charge from being carried away by the flue gas and ensures that the charge is heated smoothly and evenly.

[0037] Example 3 The magnetic adsorption assembly 86 includes a frame 861 that is sleeved on the furnace charge cylinder 82. The frame 861 is correspondingly arranged with the right side section and the middle section of the furnace charge cylinder 82. The first magnetic block 862 and the second magnetic block 863 are arranged inside the frame 861. The top of the outer cylinder 81 is provided with a sliding opening. A support collar 88 is slidably connected in the sliding opening. The frame 861 is rotatably installed in the support collar 88. A telescopic hydraulic cylinder 87 is fixedly installed at the bottom of the bracket 7. The telescopic end of the telescopic hydraulic cylinder 87 is connected to the support collar 88. The first magnetic block 862 and the second magnetic block 863 are electromagnets, and their outer surfaces are protected by water-cooling jackets to prevent high-temperature demagnetization and damage. Cooling pipes 864 are provided on the outside of the frame 861, and the cooling pipes 864 are used to connect the external water cooling system to the water-cooling jacket.

[0038] Since the first magnetic block 862 and the second magnetic block 863 do not directly contact the furnace charge cylinder 82 during the high-temperature preheating process, and combined with the water-cooling structure of this embodiment, the magnetic stability of the first magnetic block 862 and the second magnetic block 863 can be greatly ensured. Electromagnets can be used, and through controllable magnetic force, they can be better applied to the preheating of different types of furnace charge.

[0039] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An energy-saving medium-frequency furnace, comprising a furnace frame (1), characterized in that, The furnace frame (1) is provided with a swingable furnace plate (2) at the top. When the furnace plate (2) swings to the right, it unloads material. An intermediate frequency furnace (3) is installed inside the furnace plate (2). The furnace plate (2) is provided with a swingable furnace cover (5) at the top. When the furnace cover (5) swings to the left, it opens. The furnace cover (5) is provided with a feeding port (51) at the top. The top of the feeding port (51) is tilted to the right. The furnace cover (5) is provided with a support (7) at the top. A preheating assembly (8) for the furnace charge is provided at the bottom of the right end of the support (7). The preheating assembly (8) for the furnace charge includes an outer cylinder (81) fixedly installed at the bottom of the right end of the support (7). A furnace charge cylinder (82) is rotatably installed inside the outer cylinder (81). The furnace charge cylinder (82) is rotatably sealed with the charging port (51). The furnace charge cylinder (82) is arranged in a three-section stepped shaft shape, and the radius increases from right to left. A magnetic adsorption assembly (86) is sleeved on the furnace charge cylinder (82). Several first magnetic blocks (862) and second magnetic blocks (863) are arranged in a ring inside the magnetic adsorption assembly (86). The magnetic force of the second magnetic block (863) is greater than that of the first magnetic block (862). The first magnetic block (862) can fit with the right side section of the furnace charge cylinder (82), and the second magnetic block (863) can fit with the middle section of the furnace charge cylinder (82). The furnace charge preheating assembly (8) is provided with a lifting hopper (9) and a flue pipe (10) on the right side.

2. The energy-saving medium-frequency furnace according to claim 1, characterized in that, A base (11) is provided on the right side of the furnace charge preheating component (8). The base (11) is installed on the ground. A slide (12) is slidably connected to the base (11). A sliding hydraulic cylinder (13) is provided on the right side of the base (11). The telescopic end of the sliding hydraulic cylinder (13) is connected to the slide (12). A lifting frame (14) is slidably connected to the top of the slide (12). The feeding hopper (9) and the exhaust pipe (10) are both fixedly installed on the lifting frame (14), and the feeding hopper (9) is located above the exhaust pipe (10). A lifting hydraulic cylinder (15) is fixedly installed on the outside of the slide (12). The telescopic end of the lifting hydraulic cylinder (15) is connected to the lifting frame (14).

3. The energy-saving medium-frequency furnace according to claim 2, characterized in that, Both the feeding hopper (9) and the exhaust pipe (10) are provided with plug-in ends on their left ends, which can be plugged into the furnace charge cylinder (82).

4. The energy-saving medium-frequency furnace according to claim 3, characterized in that, The inner side of the furnace frame (1) is hinged with a discharge hydraulic cylinder (4), and the telescopic end of the discharge hydraulic cylinder (4) is hinged with the furnace plate (2).

5. An energy-saving medium-frequency furnace according to claim 4, characterized in that, The outer side of the furnace plate (2) is hinged with a cover-opening hydraulic cylinder (6), and the telescopic end of the cover-opening hydraulic cylinder (6) is hinged with the furnace cover (5).

6. An energy-saving medium-frequency furnace according to claim 5, characterized in that, A three-phase asynchronous motor is installed on the top of the bracket (7), and a drive wheel (71) is installed at the output end of the three-phase asynchronous motor. A transmission wheel (72) is rotatably installed inside the bracket (7). An external gear ring (83) is provided on the outside of the furnace charge cylinder (82). The transmission wheel (72) meshes between the drive wheel (71) and the external gear ring (83).

7. An energy-saving medium-frequency furnace according to claim 6, characterized in that, The magnetic adsorption assembly (86) includes a frame (861) fitted onto the furnace charge cylinder (82). The frame (861) is correspondingly arranged with the right side section and the middle section of the furnace charge cylinder (82). The first magnetic block (862) and the second magnetic block (863) are arranged inside the frame (861). The top of the outer cylinder (81) is provided with a sliding opening. A support collar (88) is slidably connected in the sliding opening. The frame (861) is rotatably installed in the support collar (88). A telescopic hydraulic cylinder (87) is fixedly installed at the bottom of the bracket (7). The telescopic end of the telescopic hydraulic cylinder (87) is connected to the support collar (88). The first magnetic block (862) and the second magnetic block (863) are electromagnets, and the outer surface is provided with a water-cooling jacket for protection to prevent high temperature demagnetization and damage. The outer side of the frame (861) is provided with a cooling pipe (864), which is used to connect the external water cooling system and the water-cooling jacket.

8. An energy-saving medium-frequency furnace according to claim 7, characterized in that, The right end of the furnace charge cylinder (82) is tilted upward at 5-10°.

9. An energy-saving medium-frequency furnace according to claim 7, characterized in that, The furnace charge cylinder (82) is horizontally arranged, and a first spiral guide (84) is provided inside the right side section of the furnace charge cylinder (82), and a second spiral guide (85) is provided inside the middle section of the furnace charge cylinder (82).

10. An energy-saving medium-frequency furnace according to claim 9, characterized in that, The pitch of the first spiral guide (84) is greater than the pitch of the second spiral guide (85), and the second spiral guide (85) has a smoke-proof mesh hole.

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