Intermediate frequency furnace scrap steel treatment device combining natural gas preheating with vibration feeding

Abstract

The invention relates to the technical field of intermediate frequency furnace scrap steel treatment, and discloses an intermediate frequency furnace scrap steel treatment device combining natural gas preheating and vibration feeding, which comprises a furnace body, a conveying box is fixedly mounted on the lower part of the outer side wall of the furnace body, a screening plate is rotatably mounted in the middle of the inner side wall of the furnace body, and the intermediate frequency furnace scrap steel treatment device further comprises a vibration mechanism, the vibration mechanisms are arranged on the left side and the right side of the outer side wall of the furnace body. The conveying mechanism is arranged in an inner cavity of the conveying box; and the purification mechanism is arranged on the upper portion of the right side of the outer side wall of the furnace body. Steel materials of different sizes are added into the furnace body through the blanking hopper, the natural gas preheating pipe rows on the two sides are started at the same time, the function of preheating the steel materials can be achieved, the time of the steel materials of different sizes staying in the furnace body can be adjusted through the arrangement of the vibration mechanism and the conveying mechanism, fine particles preferentially fall into a high-temperature area to be rapidly heated, and the production efficiency is improved. And large blocks slowly move backwards to finish soaking, so that the steel material processing efficiency of a factory is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of scrap steel treatment in intermediate frequency furnace, in particular to a scrap steel treatment device for intermediate frequency furnace with natural gas preheating combined with vibration feeding. BACKGROUND

[0002] Intermediate frequency furnace is a power supply device that converts 50Hz power frequency alternating current into intermediate frequency. Three-phase power frequency alternating current is rectified into direct current, and then the direct current is converted into adjustable intermediate frequency current. The intermediate frequency alternating current flowing through the capacitor and the inductive coil generates high-density magnetic lines of force in the inductive coil, and cuts the metal material in the inductive coil to generate a large eddy current in the metal material. Early scrap smelting relies on electric arc furnaces or pure intermediate frequency induction furnaces, which completely rely on electric energy for heating, resulting in high energy consumption and cost affected by electricity price fluctuations. Especially in areas where power resources are scarce, a single power mode is difficult to maintain economic efficiency. In addition, direct feeding of cold scrap steel into the furnace will cause a sharp drop in the temperature in the furnace, forcing the equipment to be in a high-power compensation state for a long time, further exacerbating energy waste.

[0003] At present, when the existing intermediate frequency furnace processes steel materials, artificial or mechanical static feeding is often used, which can easily cause problems such as accumulation of materials in the furnace, large differences in void ratio, local overheating, difficult stirring of the molten pool, and shortening of the electrode life. At the same time, the impact of large scrap steel falling on the furnace lining can accelerate the peeling of refractory materials, increase the maintenance frequency and downtime. Therefore, there is an urgent need for a scrap steel treatment device for intermediate frequency furnace with natural gas preheating combined with vibration feeding. SUMMARY

[0004] (I) Technical problems solved

[0005] The purpose of the present application is to provide a scrap steel treatment device for intermediate frequency furnace with natural gas preheating combined with vibration feeding to solve the problems raised in the background.

[0006] (II) Technical solutions

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a scrap steel treatment device for intermediate frequency furnace with natural gas preheating combined with vibration feeding, comprising a furnace body, a conveying box fixedly installed at the lower part of the outer side wall of the furnace body, support feet fixedly installed around the lower end face of the conveying box, a feeding hopper fixedly installed at the upper part of the inner side wall of the furnace body, a natural gas preheating pipe row fixedly installed at the middle part of the inner side wall of the furnace body, and a screening plate rotatably installed at the middle part of the inner side wall of the furnace body, further comprising:

[0008] A vibration mechanism is arranged on the left and right sides of the outer side wall of the furnace body, and the vibration mechanism is used for flipping the screening plate up and down.

[0009] A conveying mechanism is arranged in the inner cavity of the conveying box, and is used for conveying the steel material.

[0010] A purifying mechanism is arranged on the right upper portion of the outer side wall of the furnace body, and is used for absorbing and treating the waste gas generated by preheating the steel material.

[0011] Preferably, the vibrating mechanism comprises side frames fixedly installed on the left and right sides of the middle portion of the inner side wall of the furnace body, and a driving worm rotatably installed in the inner cavity of the side frame, and the front and rear sides of the inner side wall of the furnace body are rotatably installed with positioning rods, and the side wall of the positioning rod is fixedly installed with a plurality of groups of poking blocks.

[0012] Preferably, the side wall of the positioning rod is fixedly installed with a driving worm gear, and the driving worm gear is arranged on the side wall of the positioning rod in a plurality of groups, and the driving worm gear is arranged between two poking blocks, and the driving worm gear is in meshing connection with the driving worm, and the side frame is arranged on the side wall of the furnace body in a plurality of groups, and the poking block is in abutting contact with the screening plate.

[0013] Preferably, a transmission rod is rotatably installed on the side wall of the inner cavity of the furnace body, and the transmission rod is fixedly connected with the driving worm, and the end of the transmission rod away from the driving worm is fixedly installed with a sprocket, and the middle portion of the right end face of the furnace body is fixedly installed with a vibrating motor through a bracket, and the output shaft end of the vibrating motor is fixedly connected with the sprocket in the right middle portion, and a chain is transmissionally installed between the sprockets on the right side.

[0014] Preferably, the screening plate is arranged in the inner cavity of the furnace body in two groups, and the screening plate is arranged in an inclined manner in the inner cavity of the furnace body, and the two screening plates are arranged in an up-and-down staggered manner, and the inclination angle of the screening plate and the inner side wall of the furnace body ranges from 15° to 25°, and the side wall of the screening plate is provided with filter holes, and the inner diameter of the filter holes in the side wall of the screening plate increases from the upper right to the lower left, and the lower portion of the inner side wall of the furnace body is fixedly installed with a blocking plate, and the blocking plate is arranged at one third of the inclined wall of the screening plate.

[0015] Preferably, the conveying mechanism comprises a driving roller rotatably installed on the right side of the side wall of the inner cavity of the conveying box, and a driven roller rotatably installed on the left side of the side wall of the inner cavity of the conveying box, and the side wall of the driving roller and the driven roller is transmissionally installed with a conveying belt, and the conveying belt is located directly below the furnace body.

[0016] Preferably, the front end face of the conveying box is fixedly installed with a support plate, and the conveying worm is rotatably installed between the two support plates, and the front end face of the driving roller penetrates the conveying box and is fixedly installed with a conveying worm gear, and the conveying worm is in meshing connection with the conveying worm gear, and the front end face of the conveying box is fixedly installed with a conveying motor through a bracket on the right side, and the output shaft end of the conveying motor is fixedly connected with the conveying worm.

[0017] Preferably, the purification mechanism comprises a pressure accumulator box fixedly installed on the right end face of the furnace body, and a piston plate slidingly installed in the inner cavity of the pressure accumulator box, the lower end face of the piston plate is fixedly installed with a piston rod, cam blocks are fixedly installed on the side walls of the chain wheels on the front and rear sides, the piston rod abuts against the side walls of the cam blocks, and a return spring is wound and installed on the side wall of the piston rod.

[0018] Preferably, one end of the return spring is fixedly installed on the side wall of the piston plate, the other end of the return spring is fixedly installed on the inner cavity side wall of the pressure accumulator box, the middle part of the right end face of the furnace body is fixedly installed with a purification box, the inner cavity side wall bottom of the purification box is filled with lime water, and an activated carbon particle plate is fixedly installed on the upper part of the inner cavity side wall of the purification box, and the activated carbon particle plate is provided with a plurality of groups.

[0019] Preferably, the inner cavity of the material drop hopper is inclined, an air suction cover is fixedly installed on the right side slope of the material drop hopper, an air guide pipe is fixedly installed at the end of the air suction cover, the air guide pipe is connected with the material drop hopper and the furnace body in a penetrating mode, a double-way pipe is fixedly installed at the lower end of the air guide pipe, the double-way pipe is fixedly connected with the pressure accumulator box, a one-way air valve is arranged in the inner cavity of the double-way pipe and faces the direction of the pressure accumulator box, the pressure accumulator box is fixedly connected with the purification box through an exhaust pipe, and a one-way air valve is arranged in the inner cavity of the exhaust pipe and faces the direction of the purification box.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] 1、In the present application, the worker can start the vibration motor to rotate the middle chain wheel, and under the transmission of the chain, the three groups of chain wheels can simultaneously drive the transmission rod to rotate the driving worm, at this time, the driving worm can drive the positioning rod to rotate the driving block, by controlling the vibration motor to rotate forward and reverse, the screening plate can be shaken up and down to avoid the steel material from being blocked on the screening plate, by the arrangement of the plurality of filtering holes on the screening plate, and the increasing of the inner diameters of the filtering holes from the right upper to the lower on the side wall of the screening plate, the steel material with different diameters can be continuously screened, the steel material with smaller diameter can quickly fall on the conveying belt, and the steel material with larger diameter can slowly fall on the conveying belt, and the steel material can be fully preheated in the furnace body, so that the subsequent melting furnace can uniformly heat all the steel material, and the quality of the steel material is improved.

[0022] 2、The invention, when the front and rear two sides of the sprocket occurs rotation, cam block will constantly extrude piston rod makes the piston plate in the inner cavity of the pressure box to move up and down, with the pressure box upper cavity volume constantly changing, can be from the suction cover suction furnace by steel heating caused by toxic waste gas, and then the exhaust gas through the air duct and double pipe into the upper cavity of the pressure box, finally through the exhaust pipe makes the exhaust gas is discharged in the inner cavity bottom of the water tank, through the inner cavity sidewall bottom of the purification box filled with lime water, and the setting of multiple groups of activated carbon particle board, can absorb the toxic substances in the exhaust gas, discharge fresh air around the machine, ensure the safety of the worker workplace environment. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a front view overall structure schematic diagram of the scrap steel treatment device of the medium frequency furnace of the invention with natural gas preheating combined with vibration feeding;

[0024] Figure 2 It is a rear view overall structure schematic diagram of the scrap steel treatment device of the medium frequency furnace of the invention with natural gas preheating combined with vibration feeding;

[0025] Figure 3 It is a front view cross-sectional structure schematic diagram of the scrap steel treatment device of the medium frequency furnace of the invention with natural gas preheating combined with vibration feeding;

[0026] Figure 4 It is a front view plane cross-sectional structure schematic diagram of the scrap steel treatment device of the medium frequency furnace of the invention with natural gas preheating combined with vibration feeding;

[0027] Figure 5 It is a screening plate display structure schematic diagram of the scrap steel treatment device of the medium frequency furnace of the invention with natural gas preheating combined with vibration feeding;

[0028] Figure 6 It is a vibration mechanism connection structure schematic diagram of the scrap steel treatment device of the medium frequency furnace of the invention with natural gas preheating combined with vibration feeding;

[0029] Figure 7 It is a pressure box cross-sectional structure schematic diagram of the scrap steel treatment device of the medium frequency furnace of the invention with natural gas preheating combined with vibration feeding;

[0030] Figure 8 It is a conveying mechanism connection structure schematic diagram of the scrap steel treatment device of the medium frequency furnace of the invention with natural gas preheating combined with vibration feeding.

[0031] In the figure: 1, furnace body; 2, conveying box; 3, supporting leg; 4, blanking hopper; 41, air suction cover; 42, air guide pipe; 5, natural gas preheating pipe row; 6, screening plate; 61, filter hole; 62, blocking plate; 7, vibrating mechanism; 71, side frame; 72, driving worm; 73, positioning rod; 74, toggle block; 75, driving worm wheel; 76, transmission rod; 77, chain wheel; 78, vibrating motor; 79, chain; 8, conveying mechanism; 81, driving roller; 82, driven roller; 83, conveying belt; 84, supporting plate; 85, conveying worm; 86, conveying worm wheel; 87, conveying motor; 9, purification mechanism; 91, pressure storage box; 92, piston plate; 93, piston rod; 94, cam block; 95, return spring; 96, purification box; 961, double-way pipe; 962, exhaust pipe; 97, activated carbon particle plate. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0033] Please refer to Figures 1-8 The present application provides a technical scheme of a scrap steel treatment device for a medium-frequency furnace with natural gas preheating and vibration feeding.

[0034] A scrap steel treatment device for a medium-frequency furnace with natural gas preheating and vibration feeding, comprising a furnace body 1, a conveying box 2 fixedly installed at the lower part of the outer side wall of the furnace body 1, supporting legs 3 fixedly installed around the lower end surface of the conveying box 2, a blanking hopper 4 fixedly installed at the upper part of the inner side wall of the furnace body 1, a natural gas preheating pipe row 5 fixedly installed at the middle part of the inner side wall of the furnace body 1, and a screening plate 6 rotatably installed at the middle part of the inner side wall of the furnace body 1, further comprising:

[0035] A vibrating mechanism 7 arranged at the left and right sides of the outer side wall of the furnace body 1, the vibrating mechanism 7 being used for flipping the screening plate 6 up and down;

[0036] A conveying mechanism 8 arranged in the inner cavity of the conveying box 2, the conveying mechanism 8 being used for conveying steel materials;

[0037] A purification mechanism 9 arranged at the upper part of the right side of the outer side wall of the furnace body 1, the purification mechanism 9 being used for absorbing and treating waste gas generated by preheating of the steel materials.

[0038] Further, the vibrating mechanism 7 comprises side frames 71 fixedly installed on the left and right sides of the middle part of the inner side wall of the furnace body 1, and a driving worm 72 rotatably installed in the inner cavity of the side frame 71. The front and rear sides of the inner side wall of the furnace body 1 are rotatably installed with positioning rods 73, and the side wall of the positioning rod 73 is fixedly installed with a push block 74. The push block 74 is provided with a plurality of groups on the side wall of the positioning rod 73.

[0039] The side wall of the positioning rod 73 is fixedly installed with a driving worm wheel 75, which is provided with a plurality of groups on the side wall of the positioning rod 73. The driving worm wheel 75 is arranged between the two push blocks 74 and is in meshing connection with the driving worm 72. The side frame 71 is provided with a plurality of groups on the side wall of the furnace body 1, and the push block 74 is in abutting contact with the screening plate 6.

[0040] A transmission rod 76 is rotatably installed on the side wall of the inner cavity of the furnace body 1 and is fixedly connected with the driving worm 72. The end of the transmission rod 76 away from the driving worm 72 is fixedly installed with a sprocket 77. The right end surface of the furnace body 1 is fixedly installed with a vibrating motor 78 through a bracket. The output shaft end of the vibrating motor 78 is fixedly connected with the sprocket 77 in the right middle part. The sprockets 77 located on the right side are transmissionally installed with a chain 79.

[0041] It should be noted that by starting the vibrating motor 78 to operate, the middle sprocket 77 rotates, and under the transmission action of the chain 79, the three groups of sprockets 77 can simultaneously drive the transmission rod 76 to rotate the driving worm 72. Since the driving worm wheel 75 is in meshing connection with the driving worm 72, the driving worm wheel 75 can drive the positioning rod 73 to rotate the push block 74 at this time. By abutting the push block 74 with the screening plate 6, the vibrating motor 78 is controlled to rotate forward and reverse, which can make the screening plate 6 vibrate up and down to avoid the clogging of the steel material on the screening plate 6. By the arrangement of the plurality of filtering holes 61 on the screening plate 6, and the increasing inner diameter of the filtering holes 61 on the side wall of the screening plate 6 from the right upper to the lower, the steel material with different diameters can be continuously screened. The steel material with smaller diameter falls quickly onto the conveying belt, and the steel material with larger diameter falls slowly onto the conveying belt. The steel material is fully preheated in the furnace body 1 to ensure that the subsequent melting furnace uniformly heats all the steel material, thereby improving the quality of the steel material.

[0042] Further, the furnace body 1 is provided with two groups of screening plates 6 in the inner cavity. The screening plates 6 are arranged obliquely in the inner cavity of the furnace body 1, and the two screening plates 6 are arranged staggered up and down. The inclination angle of the screening plate 6 with the inner side wall of the furnace body 1 is in the range of 15°-25°. The side wall of the screening plate 6 is provided with filtering holes 61, and the inner diameter of the filtering holes 61 on the side wall of the screening plate 6 increases from the right upper to the lower. The inner side wall of the furnace body 1 is fixedly installed with a blocking plate 62, which is arranged at one third of the inclined wall of the screening plate 6.

[0043] The conveying mechanism 8 comprises a driving roller 81 rotatably installed on the right side wall of the inner cavity of the conveying box 2, and a driven roller 82 rotatably installed on the left side wall of the inner cavity of the conveying box 2, and the side walls of the driving roller 81 and the driven roller 82 are rotatably installed with a conveying belt 83, and the conveying belt 83 is located directly below the furnace body 1;

[0044] The front end face of the conveying box 2 is fixedly installed with two supporting plates 84, and the conveying worm 85 is rotatably installed between the two supporting plates 84, and the front end face of the driving roller 81 is fixedly installed with a conveying worm wheel 86 penetrating through the conveying box 2, and the conveying worm 85 is connected with the conveying worm wheel 86 in meshing connection, and the front end face of the conveying box 2 is fixedly installed with a conveying motor 87 through the frame, and the output shaft end of the conveying motor 87 is fixedly connected with the conveying worm 85.

[0045] It should be noted that the conveying motor 87 is started to rotate the conveying worm 85, and the conveying worm 85 is connected with the conveying worm wheel 86 in meshing connection, and at this time the conveying worm wheel 86 can drive the driving roller 81 to rotate, and under the cooperation of the driven roller 82, the conveying belt 83 can be rotated to realize the conveying of the steel material to the right and into the high-temperature forging furnace for processing.

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

[0047] One end of the return spring 95 is fixedly installed on the side wall of the piston plate 92, and the other end of the return spring 95 is fixedly installed on the inner cavity side wall of the pressure accumulator 91, and the right end face of the furnace body 1 is fixedly installed with a purification box 96 in the middle, and the inner cavity side wall of the purification box 96 is filled with lime water at the bottom, and the inner cavity side wall of the purification box 96 is fixedly installed with an activated carbon particle plate 97 at the upper part, and the activated carbon particle plate 97 is provided with a plurality of groups;

[0048] The inner cavity of the material falling hopper 4 is inclinedly arranged, and the right side slope of the material falling hopper 4 is fixedly installed with an air suction cover 41, and the end of the air suction cover 41 is fixedly installed with an air guide pipe 42, and the air guide pipe 42 is connected with the material falling hopper 4 and the furnace body 1 in penetration, and the lower end of the air guide pipe 42 is fixedly installed with a double-way pipe 961, and the double-way pipe 961 is fixedly connected with the pressure accumulator 91, and the inner cavity of the double-way pipe 961 is provided with a one-way air valve with an outlet towards the direction of the pressure accumulator 91, and the pressure accumulator 91 is fixedly connected with the purification box 96 through an exhaust pipe 962, and the inner cavity of the exhaust pipe 962 is provided with a one-way air valve with an outlet towards the direction of the purification box 96.

[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. 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 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 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.

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: 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).

6. 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 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).

7. A medium-frequency furnace scrap steel processing device using natural gas preheating combined with vibration feeding as described in claim 6, 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).

8. The scrap steel processing device for a medium-frequency furnace 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. The piston rod (93) abuts against the side wall of the cam block (94). A return spring (95) is wound around the side wall of the piston rod (93).

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: One end of the return spring (95) is fixedly installed on the side wall of the piston plate (92), and the other end of the return 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.

10. A medium-frequency furnace scrap steel processing device using natural gas preheating combined with vibration feeding as described in claim 9, 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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