A scrap steel processing device of a medium-frequency furnace with natural gas preheating combined with vibration feeding

Abstract

This invention relates to the field of scrap steel processing technology for medium-frequency furnaces, and discloses a scrap steel processing device for medium-frequency furnaces that combines natural gas preheating with vibration feeding. The device includes a furnace body, a conveyor box fixedly installed on the lower part of the outer wall of the furnace body, a screening plate rotatably installed on the middle of the inner wall of the furnace body, a vibration mechanism disposed on the left and right sides of the outer wall of the furnace body, a conveying mechanism disposed within the inner cavity of the conveyor box, and a purification mechanism disposed on the upper right side of the outer wall of the furnace body. This invention allows for the preheating of steel materials of different sizes by adding them into the furnace body through a hopper and simultaneously activating the natural gas preheating pipes on both sides. The vibration and conveying mechanisms allow for the control of the residence time of steel materials of different sizes within the furnace body, ensuring that fine particles preferentially fall into the high-temperature zone for rapid heating, while larger pieces gradually move backward to achieve homogenization, significantly improving the efficiency of steel processing in factories.

Description

Technical Field

[0001] This invention relates to the field of scrap steel treatment technology for medium-frequency furnaces, specifically to a scrap steel treatment device for medium-frequency furnaces that combines natural gas preheating with vibration feeding. Background Technology

[0002] An intermediate frequency furnace is a power supply device that converts 50Hz AC power into intermediate frequency power. It rectifies three-phase AC power into DC power, then converts the DC power into adjustable intermediate frequency current, supplying this current to the capacitor and induction coil. This generates high-density magnetic lines of force in the induction coil, cutting the metal material held within and inducing large eddy currents within the metal. Early scrap steel smelting relied heavily on electric arc furnaces or simple intermediate frequency induction furnaces, entirely dependent on electricity for heating. This resulted in high energy consumption and costs heavily influenced by electricity price fluctuations. Especially in regions with limited power resources, this single-mode electricity consumption was unsustainable. Furthermore, directly feeding cold scrap steel into the furnace caused a sudden drop in furnace temperature, forcing the equipment to operate at high power compensation for extended periods, further exacerbating energy waste.

[0003] Currently, existing medium-frequency furnaces often use manual or mechanical static feeding when processing steel, which easily leads to problems such as material accumulation and large differences in porosity within the furnace. This results in localized overheating, difficulty in stirring the molten pool, and shortened electrode life. Furthermore, large pieces of scrap steel falling and impacting the furnace lining accelerate the spalling of refractory materials, increasing maintenance frequency and downtime. Therefore, there is an urgent need for a medium-frequency furnace scrap steel processing device that combines natural gas preheating with vibration feeding. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] The purpose of this invention is to provide a medium-frequency furnace scrap steel processing device that combines natural gas preheating with vibration feeding, so as to solve the problems mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a medium-frequency furnace scrap steel processing device using natural gas preheating combined with vibration feeding, comprising a furnace body, a conveyor box fixedly installed on the lower part of the outer side wall of the furnace body, support feet fixedly installed around the lower end face of the conveyor box, a material hopper fixedly installed on the upper part of the inner side wall of the furnace body, a natural gas preheating pipe bank fixedly installed in the middle of the inner side wall of the furnace body, and a screening plate rotatably installed in the middle of the inner side wall of the furnace body, and further comprising:

[0008] A vibration mechanism is provided on the left and right sides of the outer wall of the furnace body. The vibration mechanism is used to flip the screening plate up and down.

[0009] A conveying mechanism is disposed in the inner cavity of the conveying box and is used to convey steel materials;

[0010] A purification mechanism is located on the upper right side of the outer wall of the furnace body. The purification mechanism is used to absorb and treat the waste gas generated during the preheating of steel.

[0011] Preferably, the vibration mechanism includes side frames fixedly installed on the left and right sides of the middle of the inner side wall of the furnace body, and a drive worm gear rotatably installed in the inner cavity of the side frames. Positioning rods are rotatably installed on the front and rear sides of the inner side wall of the furnace body. Actuating blocks are fixedly installed on the side wall of the positioning rods, and several sets of actuating blocks are provided on the side wall of the positioning rods.

[0012] Preferably, a drive worm gear is fixedly installed on the side wall of the positioning rod, and several sets of drive worm gears are provided on the side wall of the positioning rod. The drive worm gears are located between two actuating blocks, and the drive worm gears are meshed with the drive worm. Several sets of side frames are provided on the side wall of the furnace body, and the actuating blocks abut against the screening plate.

[0013] Preferably, a transmission rod is rotatably mounted on the inner cavity sidewall of the furnace body, the transmission rod is fixedly connected to the drive worm gear, a sprocket is fixedly mounted on the end of the transmission rod away from the drive worm gear, a vibration motor is fixedly mounted on the middle of the right end face of the furnace body via a frame, the output shaft end of the vibration motor is fixedly connected to the sprocket in the middle of the right side, and a chain is driven between the sprockets on the right side.

[0014] Preferably, two sets of screening plates are provided in the inner cavity of the furnace body. The screening plates are inclined in the inner cavity of the furnace body, and the two screening plates are staggered vertically. The inclination angle between the screening plates and the inner side wall of the furnace body is in the range of 15°-25°. Filter holes are opened on the side wall of the screening plates. The inner diameter of the filter holes on the side wall of the screening plates increases continuously from the upper right to the lower right. A baffle plate is fixedly installed on the lower part of the inner side wall of the furnace body. The baffle plate is located at one-third of the inclined wall of the screening plates.

[0015] Preferably, the conveying mechanism includes a drive roller rotatably mounted on the right side wall of the inner cavity of the conveying box, and a driven roller rotatably mounted on the left side wall of the inner cavity of the conveying box. A conveyor belt is driven and mounted on the side walls of the drive roller and the driven roller, and the conveyor belt is located directly below the furnace body.

[0016] Preferably, a support plate is fixedly installed on the front end face of the conveyor box, and a conveying worm gear is rotatably installed between the two support plates. A conveying worm wheel is fixedly installed through the front end face of the drive roller, and the conveying worm gear is meshed with the conveying worm wheel. A conveying motor is fixedly installed on the right side of the front end face of the conveyor box via a frame, and the output shaft end of the conveying motor is fixedly connected to the conveying worm gear.

[0017] Preferably, the purification mechanism includes a pressure accumulator box fixedly installed on the front and rear sides of the right end of the furnace body, and a piston plate slidably installed in the inner cavity of the pressure accumulator box. A piston rod is fixedly installed on the lower end face of the piston plate, and a cam block is fixedly installed on the side wall of the sprocket located on the front and rear sides. The piston rod abuts against the side wall of the cam block, and a return spring is wound on the side wall of the piston rod.

[0018] Preferably, one end of the reset spring is fixedly installed on the side wall of the piston plate, and the other end of the reset spring is fixedly installed on the inner cavity side wall of the accumulator box. A purification box is fixedly installed in the middle of the right end face of the furnace body. The bottom of the inner cavity side wall of the purification box is filled with lime water. An activated carbon granule plate is fixedly installed in the upper part of the inner cavity side wall of the purification box. Several sets of activated carbon granule plates are provided.

[0019] Preferably, the inner cavity of the hopper is inclined, and an air suction hood is fixedly installed on the right inclined surface of the hopper. An air intake pipe is fixedly installed at the end of the air suction hood. The air intake pipe is connected through the hopper and the furnace body. A double-pass pipe is fixedly installed at the lower end of the air intake pipe. The double-pass pipe is fixedly connected to the accumulator box. The inner cavity of the double-pass pipe is provided with a one-way air valve with an outlet towards the accumulator box. The accumulator box is fixedly connected to the purification box through an exhaust pipe. The inner cavity of the exhaust pipe is provided with a one-way air valve with an outlet towards the purification box.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. In this invention, the worker can start the vibrating motor to rotate the sprocket in the middle. Under the transmission of the chain, the three sets of sprockets can simultaneously drive the transmission rod to rotate the drive worm. At this time, the drive worm can drive the positioning rod to rotate the actuating block. By controlling the vibrating motor to rotate continuously in the forward and reverse directions, the screening plate can be shaken up and down to avoid the steel material from clogging on the screening plate. Through the setting of several sets of filter holes on the screening plate, and the inner diameter of the filter holes on the side wall of the screening plate continuously increases from the upper right to the lower right, the steel material can be continuously screened according to different diameters. The steel material with smaller diameter falls quickly onto the conveyor belt, while the steel material with larger diameter falls slowly onto the conveyor belt and is fully preheated in the furnace to ensure that the subsequent furnace uniformly heats all the steel material, thereby improving the quality of the steel.

[0022] 2. In this invention, when the sprockets on the front and rear sides rotate, the cam block will continuously squeeze the piston rod, causing the piston plate to move up and down in the inner cavity of the accumulator box. As the volume of the upper cavity of the accumulator box changes continuously, toxic waste gas from the heating of steel in the furnace can be drawn in through the suction hood. The waste gas then enters the upper cavity of the accumulator box through the air inlet pipe and the double-pass pipe. Finally, the waste gas is discharged to the bottom of the inner cavity of the clean water tank through the exhaust pipe. The bottom of the inner cavity side wall of the purification box is filled with lime water and multiple sets of activated carbon granule plates, which can absorb the toxic substances in the waste gas and release fresh air around the machine, ensuring the safety of the workers' workplace environment. Attached Figure Description

[0023] Figure 1 This is a front view schematic diagram of the overall structure of a medium-frequency furnace scrap steel processing device that combines natural gas preheating with vibration feeding according to the present invention;

[0024] Figure 2 This is a rear view schematic diagram of the overall structure of a medium-frequency furnace scrap steel processing device that combines natural gas preheating with vibration feeding according to the present invention.

[0025] Figure 3 This is a front sectional view of a medium-frequency furnace scrap steel processing device that combines natural gas preheating with vibration feeding, according to the present invention.

[0026] Figure 4 This is a front view cross-sectional structural diagram of a medium-frequency furnace scrap steel processing device that combines natural gas preheating with vibration feeding according to the present invention;

[0027] Figure 5 This is a schematic diagram of the screening plate structure of a medium-frequency furnace scrap steel processing device that combines natural gas preheating with vibration feeding according to the present invention;

[0028] Figure 6 This is a schematic diagram of the connection structure at the vibration mechanism of a medium-frequency furnace scrap steel processing device that combines natural gas preheating with vibration feeding, according to the present invention.

[0029] Figure 7 This is a cross-sectional view of the accumulator box of a medium-frequency furnace scrap steel processing device that combines natural gas preheating with vibration feeding according to the present invention.

[0030] Figure 8 This is a schematic diagram of the connection structure at the conveying mechanism of a medium-frequency furnace scrap steel processing device that combines natural gas preheating with vibration feeding, according to the present invention.

[0031] In the diagram: 1. Furnace body; 2. Conveying box; 3. Support leg; 4. Feed hopper; 41. Suction hood; 42. Air intake pipe; 5. Natural gas preheating pipe; 6. Screening plate; 61. Filter holes; 62. Barrier plate; 7. Vibration mechanism; 71. Side frame; 72. Drive worm gear; 73. Positioning rod; 74. Actuating block; 75. Drive worm wheel; 76. Transmission rod; 77. Sprocket; 78. Vibration motor; 79. Chain; 8. Conveying mechanism; 81. Drive roller; 82. Driven roller; 83. Conveyor belt; 84. Support plate; 85. Conveying worm gear; 86. Conveying worm wheel; 87. Conveying motor; 9. Purification mechanism; 91. Accumulator box; 92. Piston plate; 93. Piston rod; 94. Cam block; 95. Return spring; 96. Purification box; 961. Double-pass pipe; 962. Exhaust pipe; 97. Activated carbon granule plate. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see Figures 1-8 This invention provides a technical solution for a medium-frequency furnace scrap steel processing device that combines natural gas preheating with vibration feeding:

[0034] A scrap steel processing device for a medium-frequency furnace using natural gas preheating combined with vibration feeding includes a furnace body 1. A conveyor box 2 is fixedly installed on the lower part of the outer side wall of the furnace body 1. Support legs 3 are fixedly installed around the lower end face of the conveyor box 2. A dropping hopper 4 is fixedly installed on the upper part of the inner side wall of the furnace body 1. A natural gas preheating pipe bank 5 is fixedly installed in the middle of the inner side wall of the furnace body 1. A screening plate 6 is rotatably installed in the middle of the inner side wall of the furnace body 1. The device also includes:

[0035] Vibration mechanism 7 is installed on the left and right sides of the outer wall of the furnace body 1. Vibration mechanism 7 is used to flip the screening plate 6 up and down.

[0036] The conveying mechanism 8 is installed inside the conveying box 2 and is used to convey steel materials.

[0037] Purification mechanism 9 is located on the upper right side of the outer wall of furnace body 1. Purification mechanism 9 is used to absorb and treat the waste gas generated during the preheating of steel.

[0038] Furthermore, the vibration mechanism 7 includes a side frame 71 fixedly installed on the left and right sides of the middle of the inner side wall of the furnace body 1, and a drive worm gear 72 rotatably installed in the inner cavity of the side frame 71. A positioning rod 73 is rotatably installed on the front and rear sides of the inner side wall of the furnace body 1. A toggle block 74 is fixedly installed on the side wall of the positioning rod 73. Several sets of toggle blocks 74 are provided on the side wall of the positioning rod 73.

[0039] A drive worm gear 75 is fixedly installed on the side wall of the positioning rod 73. Several sets of drive worm gears 75 are provided on the side wall of the positioning rod 73. The drive worm gears 75 are located between two actuating blocks 74. The drive worm gears 75 are meshed with the drive worm 72. Several sets of side frames 71 are provided on the side wall of the furnace body 1. The actuating blocks 74 abut against the screening plate 6.

[0040] A transmission rod 76 is rotatably mounted on the inner cavity side wall of the furnace body 1. The transmission rod 76 is fixedly connected to the drive worm gear 72. A sprocket 77 is fixedly mounted on the end of the transmission rod 76 away from the drive worm gear 72. A vibration motor 78 is fixedly mounted on the middle of the right end face of the furnace body 1 through a frame. The output shaft end of the vibration motor 78 is fixedly connected to the sprocket 77 in the middle of the right side. A chain 79 is installed between the sprockets 77 on the right side for transmission.

[0041] It should be noted that by starting the vibration motor 78, the sprocket 77 in the middle rotates. Under the transmission action of the chain 79, the three sets of sprockets 77 can simultaneously drive the transmission rod 76 to rotate the drive worm 72. Since the drive worm wheel 75 is meshed with the drive worm 72, the drive worm wheel 75 can drive the positioning rod 73 to rotate the actuating block 74. By pressing the actuating block 74 against the screening plate 6, the vibration motor 78 is continuously controlled to rotate in the forward and reverse directions, which can make the screening plate 6 shake up and down to avoid the steel material from clogging on the screening plate 6. Through the setting of several sets of filter holes 61 on the screening plate 6, and the inner diameter of the filter holes 61 on the side wall of the screening plate 6 continuously increases from the upper right to the lower left, the steel material can be continuously screened according to different diameters. The steel material with smaller diameter falls quickly onto the conveyor belt, while the steel material with larger diameter falls slowly onto the conveyor belt, and is fully preheated in the furnace body 1 to ensure that the subsequent furnace uniformly heats all the steel material, thereby improving the quality of the steel.

[0042] Furthermore, two sets of screening plates 6 are provided in the inner cavity of the furnace body 1. The screening plates 6 are inclined in the inner cavity of the furnace body 1, and the two screening plates 6 are staggered vertically. The inclination angle between the screening plates 6 and the inner side wall of the furnace body 1 is 15°-25°. Filter holes 61 are opened on the side wall of the screening plates 6. The inner diameter of the filter holes 61 on the side wall of the screening plates 6 increases continuously from the upper right to the lower right. A baffle plate 62 is fixedly installed on the lower part of the inner side wall of the furnace body 1. The baffle plate 62 is located at one-third of the inclined wall of the screening plates 6.

[0043] The conveying mechanism 8 includes a drive roller 81 rotatably mounted on the right side of the inner wall of the conveying box 2, and a driven roller 82 rotatably mounted on the left side of the inner wall of the conveying box 2. A conveyor belt 83 is driven and mounted on the side walls of the drive roller 81 and the driven roller 82. The conveyor belt 83 is located directly below the furnace body 1.

[0044] A support plate 84 is fixedly installed on the front end face of the conveyor box 2. A conveying worm gear 85 is rotatably installed between the two support plates 84. A conveying worm wheel 86 is fixedly installed through the front end face of the drive roller 81. The conveying worm gear 85 is meshed with the conveying worm wheel 86. A conveying motor 87 is fixedly installed on the right side of the front end face of the conveyor box 2 through the frame. The output shaft end of the conveying motor 87 is fixedly connected to the conveying worm gear 85.

[0045] It should be noted that by starting the conveyor motor 87, the conveyor worm 85 is rotated. The conveyor worm 85 is engaged with the conveyor worm wheel 86. At this time, the conveyor worm wheel 86 can drive the drive roller 81 to rotate. With the cooperation of the driven roller 82, the conveyor belt 83 can rotate, so as to convey the steel to the right and add it into the high-temperature forging furnace for processing.

[0046] Furthermore, the purification mechanism 9 includes a pressure accumulator box 91 fixedly installed on the front and rear sides of the right end of the furnace body 1, and a piston plate 92 slidably installed in the inner cavity of the pressure accumulator box 91. A piston rod 93 is fixedly installed on the lower end face of the piston plate 92. A cam block 94 is fixedly installed on the side wall of the sprocket 77 located on the front and rear sides. The piston rod 93 abuts against the side wall of the cam block 94. A return spring 95 is wound on the side wall of the piston rod 93.

[0047] One end of the reset spring 95 is fixedly installed on the side wall of the piston plate 92, and the other end of the reset spring 95 is fixedly installed on the inner cavity side wall of the accumulator box 91. A purification box 96 is fixedly installed in the middle of the right end face of the furnace body 1. The bottom of the inner cavity side wall of the purification box 96 is filled with lime water. An activated carbon granule plate 97 is fixedly installed on the upper part of the inner cavity side wall of the purification box 96. Several sets of activated carbon granule plates 97 are provided.

[0048] The inner cavity of the hopper 4 is inclined. A suction hood 41 is fixedly installed on the right inclined surface of the hopper 4. An air intake pipe 42 is fixedly installed at the end of the suction hood 41. The air intake pipe 42 is connected through the hopper 4 and the furnace body 1. A double-pass pipe 961 is fixedly installed at the lower end of the air intake pipe 42. The double-pass pipe 961 is fixedly connected to the pressure accumulator box 91. A one-way air valve with an outlet facing the pressure accumulator box 91 is opened in the inner cavity of the double-pass pipe 961. The pressure accumulator box 91 is fixedly connected to the purification box 96 through the exhaust pipe 962. A one-way air valve with an outlet facing the purification box 96 is opened in the inner cavity of the exhaust pipe 962.

[0049] It should be noted that when the sprockets 77 on both the front and rear sides rotate, the cam block 94 will continuously squeeze the piston rod 93, causing the piston plate 92 to move up and down in the inner cavity of the accumulator box 91. As the volume of the upper cavity of the accumulator box 91 changes continuously, toxic waste gas from the heating of steel in the furnace body 1 can be drawn in from the suction hood 41. The waste gas then enters the upper cavity of the accumulator box 91 through the air intake pipe 42 and the double-pass pipe 961. Finally, the waste gas is discharged to the bottom of the inner cavity of the clean water tank 96 through the exhaust pipe 962. The bottom of the inner cavity side wall of the clean water tank 96 is filled with lime water, and multiple sets of activated carbon granule plates 97 are set up to absorb the toxic substances in the waste gas and release fresh air around the machine, ensuring the safety of the workers' workplace environment.

[0050] Working principle:

[0051] During operation, workers heat steel material from the hopper 4 into the furnace body 1. The steel material continuously falls onto the surface of the screening plate 6. At this time, the worker can start the vibrating motor 78, causing the central sprocket 77 to rotate. Under the transmission action of the chain 79, the three sets of sprockets 77 can simultaneously drive the transmission rod 76 to rotate the drive worm 72. Since the drive worm wheel 75 is meshed with the drive worm 72, the drive worm wheel 75 can drive the positioning rod 73 to rotate the actuating block 74. The actuating block 74 presses against the screening plate 6, continuously controlling the vibration motor 78. The forward and reverse rotation can cause the screening plate 6 to shake up and down to avoid the steel material from clogging on the screening plate 6. With the setting of several sets of filter holes 61 on the screening plate 6, and the inner diameter of the filter holes 61 on the side wall of the screening plate 6 continuously increasing from the upper right to the lower left, the steel material can be continuously screened according to different diameters. The smaller diameter steel material falls quickly onto the conveyor belt 83, while the larger diameter steel material falls slowly onto the conveyor belt 83, and is fully preheated in the furnace body 1 to ensure that the subsequent furnace uniformly heats all the steel material, thereby improving the quality of the steel.

[0052] After all the steel material falls onto the conveyor belt 83, the conveyor motor 87 can be started to run, causing the conveyor worm 85 to rotate. The conveyor worm 85 meshes with the conveyor worm wheel 86, which can drive the drive roller 81 to rotate. With the cooperation of the driven roller 82, the conveyor belt 83 can rotate, so as to convey the steel material to the right and add it into the high-temperature forging furnace for processing.

[0053] When the sprockets 77 on both the front and rear sides rotate, the cam block 94 will continuously squeeze the piston rod 93, causing the piston plate 92 to move up and down in the inner cavity of the accumulator box 91. As the volume of the upper cavity of the accumulator box 91 changes continuously, toxic waste gas brought by the heating of steel in the furnace body 1 can be drawn in from the suction hood 41. Then, the waste gas enters the upper cavity of the accumulator box 91 through the air intake pipe 42 and the double-pass pipe 961. Finally, the waste gas is discharged to the bottom of the inner cavity of the clean water tank 96 through the exhaust pipe 962. The bottom of the inner cavity side wall of the clean water tank 96 is filled with lime water, and multiple sets of activated carbon granule plates 97 are set to absorb the toxic substances in the waste gas and release fresh air around the machine, ensuring the safety of the workers' workplace environment.

[0054] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A medium-frequency furnace scrap steel processing device using natural gas preheating combined with vibration feeding, comprising a furnace body (1), characterized in that: A conveyor box (2) is fixedly installed on the lower part of the outer side wall of the furnace body (1), and support feet (3) are fixedly installed around the lower end face of the conveyor box (2). A material hopper (4) is fixedly installed on the upper part of the inner side wall of the furnace body (1), and a natural gas preheating pipe bank (5) is fixedly installed in the middle of the inner side wall of the furnace body (1). A screening plate (6) is rotatably installed in the middle of the inner side wall of the furnace body (1). The furnace body (1) also includes: Vibration mechanism (7) is provided on the left and right sides of the outer wall of the furnace body (1). The vibration mechanism (7) is used to flip the screening plate (6) up and down. Two sets of screening plates (6) are provided in the inner cavity of the furnace body (1). The screening plates (6) are inclined in the inner cavity of the furnace body (1), and the two screening plates (6) are staggered. The inclination angle between the screening plates (6) and the inner side wall of the furnace body (1) is 15°-25°. Filter holes (61) are opened on the side wall of the screening plates (6). The inner diameter of the filter holes (61) on the side wall of the screening plates (6) increases from top to bottom. A baffle plate (62) is fixedly installed on the lower part of the inner side wall of the furnace body (1). The baffle plate (62) is located at one-third of the inclined wall of the screening plates (6). A conveying mechanism (8) is provided in the inner cavity of the conveying box (2) and is used to convey steel materials. Purification mechanism (9) is located on the upper right side of the outer wall of the furnace body (1). The purification mechanism (9) is used to absorb and treat the waste gas generated during the preheating of steel.

2. The scrap steel processing device for a medium-frequency furnace using natural gas preheating combined with vibration feeding as described in claim 1, characterized in that: The vibration mechanism (7) includes a side frame (71) fixedly installed on the left and right sides of the middle of the inner side wall of the furnace body (1), and a drive worm gear (72) rotatably installed in the inner cavity of the side frame (71). A positioning rod (73) is rotatably installed on the front and rear sides of the inner side wall of the furnace body (1). A toggle block (74) is fixedly installed on the side wall of the positioning rod (73). Several sets of toggle blocks (74) are provided on the side wall of the positioning rod (73).

3. The scrap steel processing device for a medium-frequency furnace using natural gas preheating combined with vibration feeding as described in claim 2, characterized in that: A drive worm gear (75) is fixedly installed on the side wall of the positioning rod (73). Several sets of drive worm gears (75) are provided on the side wall of the positioning rod (73). The drive worm gears (75) are located between two actuating blocks (74). The drive worm gears (75) are meshed with the drive worm (72). Several sets of side frames (71) are provided on the left and right sides of the middle of the inner cavity side wall of the furnace body (1). The actuating blocks (74) abut against the screening plate (6).

4. The scrap steel processing device for a medium-frequency furnace using natural gas preheating combined with vibration feeding as described in claim 2, characterized in that: A transmission rod (76) is rotatably mounted on the inner cavity side wall of the furnace body (1). The transmission rod (76) is fixedly connected to the drive worm (72). A sprocket (77) is fixedly mounted on the end of the transmission rod (76) away from the drive worm (72). A vibration motor (78) is fixedly mounted on the middle of the right end face of the furnace body (1) through a frame. The output shaft end of the vibration motor (78) is fixedly connected to the sprocket (77) in the middle of the right side of the inner cavity of the furnace body (1). A chain (79) is installed between the sprockets (77) on the right side.

5. The scrap steel processing device for a medium-frequency furnace using natural gas preheating combined with vibration feeding as described in claim 1, characterized in that: The conveying mechanism (8) includes a drive roller (81) rotatably mounted on the right side of the inner cavity side wall of the conveying box (2) and a driven roller (82) rotatably mounted on the left side of the inner cavity side wall of the conveying box (2). A conveyor belt (83) is driven and mounted on the side walls of the drive roller (81) and the driven roller (82). The conveyor belt (83) is located directly below the furnace body (1).

6. The scrap steel processing device for a medium-frequency furnace using natural gas preheating combined with vibration feeding as described in claim 5, characterized in that: A support plate (84) is fixedly installed on the front end face of the conveyor box (2), and a conveying worm (85) is rotatably installed between the two support plates (84). A conveying worm wheel (86) is fixedly installed through the front end face of the drive roller (81) through the conveyor box (2). The conveying worm (85) is meshed with the conveying worm wheel (86). A conveying motor (87) is fixedly installed on the right side of the front end face of the conveyor box (2) through a frame. The output shaft end of the conveying motor (87) is fixedly connected to the conveying worm (85).

7. A medium-frequency furnace scrap steel processing device using natural gas preheating combined with vibration feeding as described in claim 4, characterized in that: The purification mechanism (9) includes a pressure accumulator (91) fixedly installed on the front and rear sides of the right end of the furnace body (1), and a piston plate (92) slidably installed in the inner cavity of the pressure accumulator (91). A piston rod (93) is fixedly installed on the lower end face of the piston plate (92). A cam block (94) is fixedly installed on the side wall of the sprocket (77) located on the front and rear sides of the middle right side of the inner cavity of the furnace body (1). The piston rod (93) abuts against the side wall of the cam block (94). A return spring (95) is wound on the side wall of the piston rod (93).

8. The scrap steel processing device for a medium-frequency furnace using natural gas preheating combined with vibration feeding as described in claim 7, characterized in that: One end of the reset spring (95) is fixedly installed on the side wall of the piston plate (92), and the other end of the reset spring (95) is fixedly installed on the inner cavity side wall of the accumulator box (91). A purification box (96) is fixedly installed in the middle of the right end face of the furnace body (1). The bottom of the inner cavity side wall of the purification box (96) is filled with lime water. An activated carbon granule plate (97) is fixedly installed on the upper part of the inner cavity side wall of the purification box (96). Several sets of activated carbon granule plates (97) are provided.

9. A medium-frequency furnace scrap steel processing device using natural gas preheating combined with vibration feeding as described in claim 8, characterized in that: The inner cavity of the hopper (4) is inclined. A suction hood (41) is fixedly installed on the right inclined surface of the hopper (4). An air intake pipe (42) is fixedly installed at the end of the suction hood (41). The air intake pipe (42) is connected to the hopper (4) and the furnace body (1). A double-pass pipe (961) is fixedly installed at the lower end of the air intake pipe (42). The double-pass pipe (961) is fixedly connected to the accumulator box (91). The inner cavity of the double-pass pipe (961) is provided with a one-way air valve with an outlet towards the accumulator box (91). The accumulator box (91) is fixedly connected to the purification box (96) through the exhaust pipe (962). The inner cavity of the exhaust pipe (962) is provided with a one-way air valve with an outlet towards the purification box (96).

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