Feeding system for producing iron alloy by direct current submerged arc furnace

Abstract

The invention discloses a feeding system for iron alloy production of a direct current submerged arc furnace, and relates to the technical field of equipment for iron alloy production of direct current submerged arc furnaces. The furnace cover at the center of the electrode is connected with a central feeding device, and the furnace cover at the periphery of the electrode is connected with a peripheral feeding device; the feeding device comprises a weighing stock bin, an upper section material pipe and a lower section material pipe; a charging material pipe for supplying materials to the periphery of the electrode is fixed on the top surface of a furnace cover of the direct current submerged arc furnace; the bottom end of the charging material pipe penetrates through the furnace cover and is arranged in the direct current submerged arc furnace; and a furnace material inlet pipe for supplying materials to the center of the electrode is communicated with a material guide cylinder of the central feeding device. The invention has the advantages that the central feeding device and the corresponding matched feeding device are utilized to realize uniform material distribution at the central position in the furnace at the center surrounded by the four electrodes, and the four peripheral feeding devices and the corresponding feeding devices are utilized to realize uniform material distribution at the peripheries of the electrodes during feeding at the peripheries of the four electrodes, so that scattered material distribution is realized, and the phenomenon of fixed-point material stacking is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of ferroalloy production equipment for DC submerged arc furnaces, and particularly to a feeding system for ferroalloy production in DC submerged arc furnaces. Background Art

[0002] The working principle of a DC submerged arc furnace is that high-voltage electric energy is provided by the power grid, and the high-voltage electric energy is converted into low-voltage and large-current by the submerged arc furnace transformer and transmitted to the electrodes. The required liquid product is obtained by melting the furnace charge using the resistance heat and discharged through the tapping hole of the submerged arc furnace; during the smelting process, the raw materials are first mixed, and the mixed furnace charge is transported to the metering bin by a conveyor belt, and then the furnace charge is put into the furnace hearth through devices such as the top charging bin and the charging pipe. The mixed furnace charge is melted by the heat released from the electrodes to form slag-iron solution, and finally the slag-iron solution is discharged from the tapping hole.

[0003] Currently, most of the feeding devices for submerged arc furnaces are of the material pipe type. The feeding method of the material pipe type is to feed the furnace at fixed points through multiple material pipes arranged around the electrodes at the top of the submerged arc furnace. However, there is a problem of material stacking in fixed-point feeding, resulting in uneven material layers in the furnace hearth; the uneven material layer leads to unstable resistance of the furnace charge, increased resistance heat loss of the electrodes, and poor furnace conditions, which is not conducive to the process control of the submerged arc furnace; therefore, a reasonable feeding method is extremely important for ferroalloy production. Summary of the Invention

[0004] The purpose of the present invention is to provide a feeding system for ferroalloy production in DC submerged arc furnaces that can achieve uniform material distribution to improve the reliability of the furnace condition.

[0005] The present invention is implemented by the following technical solutions: A feeding system for ferroalloy production in DC submerged arc furnaces includes a first platform, a second platform, and several sets of feeding devices that supply materials to the center of the electrode and the periphery of the electrode respectively; a central feeding device is connected to the furnace cover at the center of the electrode, and a peripheral feeding device is connected to the furnace cover at the periphery of the electrode; the feeding device includes a weighing bin, an upper section of the material pipe, a lower section of the material pipe, and a material pipe into the furnace; the weighing bin is installed on the first platform, the upper section of the material pipe is vertically penetrated and fixed on the second platform, the bottom discharge port of the weighing bin is connected to the top end of the upper section of the material pipe, and one end of the lower section of the material pipe is connected to the bottom end of the upper section of the material pipe; the other end of the lower section of the material pipe is connected to the pipe orifice of the material pipe into the furnace, and an electric slide valve is installed on the upper section of the material pipe; the material pipe into the furnace that supplies materials to the periphery of the electrode is fixed on the top surface of the furnace cover of the DC submerged arc furnace, and the bottom end of the material pipe into the furnace passes through the furnace cover and is placed inside the DC submerged arc furnace; the material pipe into the furnace that supplies materials to the center of the electrode is communicated with the guide cylinder of the central feeding device.

[0006] Further, an insulating short section is connected to the lower material pipe adjacent to the furnace cover. The insulating short section includes a steel pipe, and first flange plates sleeved and welded at both ends of the steel pipe. An insulating ring plate is clamped between each first flange plate through a second flange plate and fixed by passing through bolts. An insulating sleeve is sleeved on the bolts, and insulating washers abutting against the corresponding first flange plates and second flange plates are sleeved at both ends of the bolts; a high-temperature resistant castable layer is provided on the inner wall of the steel pipe, and anchor hooks are embedded in the high-temperature resistant castable layer.

[0007] Further, the lower material pipe is fixedly connected to the second platform through a tie rod assembly. The tie rod assembly includes two screw rods connected by a turnbuckle. Both ends of the tie rod assembly are respectively connected to the second platform and the lower material pipe through insulating porcelain bottles.

[0008] Further, the central feeding device includes a central feeding driving motor, a driving shaft, and a feeding guide cylinder; the feeding guide cylinder is fixedly and sealingly penetrated through the center of the furnace cover. The top surface of the feeding guide cylinder is fixed with the central feeding driving motor. A rotating driving shaft is coaxially arranged in the feeding guide cylinder. The top end of the driving shaft is coaxially and drivingly connected to the output end of the central feeding driving motor. The bottom end of the driving shaft is fixed with a material leveling plate placed below the opening of the feeding guide cylinder. Material leveling plates are circumferentially and uniformly fixed on the top surface of the material leveling plate.

[0009] Further, the lower part of the feeding guide cylinder is of a necking structure, and the diameter of the opening of the feeding guide cylinder is less than or equal to the diameter of the material leveling plate.

[0010] Further, the peripheral feeding device includes a feeding bin, and a driving mechanism and a transmission gearbox installed on the top surface of the furnace cover; the driving mechanism is connected to the input shaft of the transmission gearbox, and the output shaft of the transmission gearbox passes through the furnace cover and is fixedly connected to the top surface of the feeding bin; the feeding bin swings reciprocally along a fan-shaped trajectory. An inlet is opened at the top of the feeding bin and is movably placed below the pipe orifice of the furnace inlet pipe; an outlet is opened at the bottom of the feeding bin, and a switching valve plate is swingably arranged at the outlet. A material leveling structure is arranged in the feeding bin.

[0011] Further, an arc-shaped hanging rail is fixedly connected to the bottom surface of the furnace cover above each feeding bin, and a connecting member sliding along the hanging rail is fixed on the top surface of the feeding bin.

[0012] Further, the material leveling structure includes two grate plates fixed on the inner wall of the feeding bin. One ends of the two grate plates are butted and fixed at the inlet of the feeding bin, and the grate plates are inclined downward from the inlet of the feeding bin; a plurality of material dividing partition plates are fixedly arranged at intervals from below each grate plate to the outlet of the feeding bin.

[0013] Further, the driving mechanism includes a cam, a connecting rod, a connecting handle, and a peripheral feeding driving motor; the cam is sleeved and fixed on the output end of the peripheral feeding driving motor, the edge of the cam is swingably connected to one end of the connecting rod through a connecting column, and the other end of the connecting rod is swingably connected to one end of the connecting handle; the transmission gearbox includes a box body, the horizontally arranged input shaft, the vertically arranged intermediate shaft, and the output shaft, straight gears that are sleeved and fixed on the intermediate shaft and the output shaft and mesh with each other for transmission, and bevel gears that are sleeved and fixed on the input shaft and the intermediate shaft and mesh with each other for transmission; the other end of the connecting handle is sleeved and fixed on one end of the input shaft.

[0014] Further, it further includes a cooling device, and the cooling device includes a liquid inlet cavity and a rotary joint; a liquid inlet channel and a liquid discharge channel are arranged in the output shaft of the transmission gearbox, and a coolant circulation interlayer communicating with the liquid inlet channel and the liquid discharge channel is arranged on the side wall of the feeding bin; the liquid inlet cavity is fixedly connected to the top surface of the box body, the top end of the output shaft of the transmission gearbox sequentially passes through the box body and the liquid inlet cavity upward in a sealed manner, a liquid inlet communicating with the liquid inlet channel is opened on the output shaft in the liquid inlet cavity, and a liquid inlet pipe is connected to the liquid inlet cavity; a rotary joint is connected to the liquid discharge channel of the output shaft, and the outer wall of the rotary joint is fixed to the box body.

[0015] Advantages of the present invention: At the center surrounded by four electrodes, a central feeding device and a corresponding feeding device are used to achieve uniform feeding at the central position in the furnace. Specifically, the central feeding driving motor drives the driving shaft and the material leveling plate to rotate synchronously, and the material leveling plate uniformly feeds the mixed material falling into the guide cylinder to the central position in the furnace.

[0016] For the feeding outside the four electrodes, four sets of peripheral feeding devices and corresponding feeding devices are used to achieve uniform feeding around the electrodes. Specifically, the mixed material falling into the feeding bin by the feeding device is first dispersed along the grate plate, and then falls into the space between adjacent dividing partition plates. Driven by the power of the driving mechanism, the feeding bin swings in a fan-shaped trajectory around the output shaft of the transmission gearbox, and at the same time, the mixed material in the feeding bin is uniformly fed into the furnace, realizing dispersed material dropping and avoiding the phenomenon of fixed-point material stacking.

[0017] In addition, the present invention is provided with a reliable cooling device, a coolant circulation interlayer in the feeding bin, and a liquid inlet channel and a liquid discharge channel on the output shaft, effectively extending the service life of the feeding bin and ensuring the long-term stable operation of the entire feeding system; by setting insulating short joints and insulating porcelain bottles to ensure reliable electrical insulation and avoid upward conduction of current, which is beneficial to ensuring the safe operation of the entire feeding system. Description of the Drawings

[0018] Figure 1It is a schematic structural diagram of the present invention.

[0019] Figure 2 It is a schematic structural diagram of the peripheral feeding device of the present invention.

[0020] Figure 3 It is a partial enlarged view of the driving mechanism and the transmission gearbox of the present invention.

[0021] Figure 4 It is a schematic internal structure diagram of the transmission gearbox and the cooling device of the present invention.

[0022] Figure 5 It is a schematic internal structure diagram of the feeding bin of the present invention.

[0023] Figure 6 It is a schematic internal structure diagram of the central feeding device of the present invention.

[0024] Figure 7 It is a schematic structural diagram of the opening and closing valve plate, swing arm, sleeve roller, support arm, and arc guide rail of the present invention.

[0025] Figure 8 It is a schematic structural diagram of the opening and closing valve plate and the linkage gear of the present invention.

[0026] Figure 9 It is a schematic structural diagram of the feeding device supporting the peripheral feeding device of the present invention.

[0027] Figure 10 It is a schematic structural diagram of the insulating stub of the present invention.

[0028] The markings of each component in the attached drawings are as follows: the first platform 1, the second platform 2, the DC submerged arc furnace 3, the furnace cover 3.1, the electrode 3.2, the feeding device 4, the weighing bin 4.1, the weighing sensor 4.11, the upper section feeding pipe 4.2, the lower section feeding pipe 4.3, the feeding pipe into the furnace 4.4, the electric slide valve 4.5, the insulating short joint 4.6, the steel pipe 4.61, the first flange 4.62, the second flange 4.63, the insulating ring plate 4.64, the bolt 4.65, the insulating bushing 4.66, the insulating washer 4.67, the high-temperature castable layer 4.68, the anchor hook 4.69, the tie rod assembly 4.7, the turnbuckle 4.71, the screw rod 4.72, the insulating porcelain bottle 4.73, the central feeding device 5, the central feeding drive motor 5.1, the drive shaft 5.2, the material guiding cylinder 5.3, the material leveling plate 5.4, the material leveling board 5.5, the peripheral feeding device 6, the feeding bin 6.1, the feeding port 6.11, the discharging port 6.12, the material leveling structure 6.13, the grid plate 6.131, the dividing baffle 6.132, the coolant circulation interlayer 6.14, the opening and closing valve plate 6.15, the linkage gear 6.16, the swing arm 6.17, the sleeve roller 6.18, the drive mechanism 6.2, the cam 6.21, the connecting rod 6.22, the connecting handle 6.23, the peripheral feeding drive motor 6.24, the transmission gearbox 6.3, the box body 6.31, the input shaft 6.32, the intermediate shaft 6.33, the output shaft 6.34, the liquid inlet channel 6.341, the liquid discharge channel 6.342, the liquid inlet 6.343, the spur gear 6.35, the bevel gear 6.36, the suspension rail 6.4, the connecting piece 6.5, the cooling device 7, the liquid inlet cavity 7.1, the rotary joint 7.2, the liquid inlet pipe 7.3, the support arm 8, the arc guide rail 8.1. Detailed implementation manners

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0031] As Figures 1 to 10As shown in the figure, this embodiment provides a feeding system for producing ferroalloys in a DC submerged arc furnace, which includes a first platform 1, a second platform 2, and several sets of feeding devices 4 for feeding materials to the center and the periphery of the electrode 3.2 respectively. Above the furnace cover 3.1 of the DC submerged arc furnace 3, a first platform 1 and a second platform 2 are horizontally arranged in sequence from top to bottom. The feeding device 4 includes a weighing bin 4.1, an upper section material pipe 4.2, a lower section material pipe 4.3, and a furnace charging pipe 4.4. The weighing bin 4.1 is installed on the first platform 1, and a weighing sensor 4.11 is arranged between the weighing bin 4.1 and the first platform 1. The upper section material pipe 4.2 is vertically penetrated and fixed on the second platform 2. The bottom discharge port 6.12 of the weighing bin 4.1 is connected to the top end of the upper section material pipe 4.2, and one end of the lower section material pipe 4.3 is connected to the bottom end of the upper section material pipe 4.2. The other end of the lower section material pipe 4.3 is connected to the pipe orifice of the furnace charging pipe 4.4. An electric slide gate valve 4.5 is installed on the upper section material pipe 4.2. After the electric slide gate valve 4.5 is opened, the mixed materials in the weighing bin 4.1 fall into the DC submerged arc furnace 3 in sequence through the upper section material pipe 4.2, the lower section material pipe 4.3, and the furnace charging pipe 4.4.

[0032] An insulating short section 4.6 is connected to the position of the lower section material pipe 4.3 adjacent to the furnace cover 3.1. The insulating short section 4.6 includes a steel pipe 4.61 and first flange plates 4.62 sleeved and welded at both ends of the steel pipe 4.61. An insulating ring plate 4.64 is clamped on each first flange plate 4.62 through a second flange plate 4.63 and fixed by passing through bolts 4.65. An insulating sleeve 4.66 is sleeved on the bolts 4.65, and insulating washers 4.67 abutting against the corresponding first flange plates 4.62 and second flange plates 4.63 are sleeved at both ends of the bolts 4.65. The insulating ring plate 4.64, the insulating sleeve 4.66, and the insulating washer 4.67 on the insulating short section 4.6 play an effective insulating role, avoiding safety accidents caused by the upward transmission of electric leakage of the electrode 3.2. A high-temperature resistant castable layer 4.68 is arranged on the inner wall of the steel pipe 4.61, and anchor hooks 4.69 are buried in the high-temperature resistant castable layer 4.68 to reinforce the high-temperature resistant castable layer 4.68. A small amount of high-temperature flue gas in the DC submerged arc furnace 3 will enter the lower section material pipe 4.3 upward, and the high-temperature resistant castable layer 4.68 plays a role in protecting the steel pipe 4.61.

[0033] The lower section material pipe 4.3 is connected and fixed to the second platform 2 through a tie rod assembly 4.7. The tie rod assembly 4.7 includes two screw rods 4.72 connected by a turnbuckle 4.71. Both ends of the tie rod assembly 4.7 are connected to the second platform 2 and the lower section material pipe 4.3 respectively through insulating porcelain bottles 4.73. The tie rod assembly 4.7 plays a role in stabilizing the lower section material pipe 4.3, and the insulating porcelain bottles 4.73 are set to further ensure electrical safety.

[0034] In this embodiment, a set of central feeding devices 5 is connected to the furnace cover 3.1 at the center surrounded by four electrodes 3.2. The central feeding device 5 includes a central feeding drive motor 5.1, a drive shaft 5.2, and a material guiding cylinder 5.3. A material guiding cylinder 5.3 with a downward-facing barrel mouth is hermetically penetrated and fixed at the center of the furnace cover 3.1. A central feeding drive motor 5.1 is fixed on the top surface of the material guiding cylinder 5.3. A rotatable drive shaft 5.2 is coaxially arranged in the material guiding cylinder 5.3. The top end of the drive shaft 5.2 is coaxially driven and connected to the output end of the central feeding drive motor 5.1. A material leveling plate 5.4 is fixed at the bottom end of the drive shaft 5.2 and is placed below the barrel mouth of the material guiding cylinder 5.3. The central feeding drive motor 5.1 drives the drive shaft 5.2 and the material leveling plate 5.4 to rotate synchronously, facilitating uniform feeding of the falling mixed material. The lower part of the material guiding cylinder 5.3 is a necking structure. The diameter of the barrel mouth of the material guiding cylinder 5.3 is less than or equal to the diameter of the material leveling plate 5.4. The material leveling plates 5.5 are circumferentially and evenly fixed on the top surface of the material leveling plate 5.4. The furnace charge pipe 4.4 for feeding materials to the center of the electrode 3.2 is communicated with the material guiding cylinder 5.3 of the central feeding device 5. The mixed material fed into the material guiding cylinder 5.3 through the furnace charge pipe 4.4 falls down along the material guiding cylinder 5.3 onto the material leveling plate 5.4. During the rotation of the material leveling plate 5.4, the mixed material is evenly scattered downward by the material leveling plates 5.5, achieving the purpose of uniform feeding to the center of the electrode 3.2.

[0035] Four sets of peripheral feeding devices 6 are circumferentially and evenly connected to the furnace cover 3.1 at the periphery of the four electrodes 3.2. The peripheral feeding device 6 includes a feeding bin 6.1, and a drive mechanism 6.2 and a transmission gearbox 6.3 installed on the top surface of the furnace cover 3.1. The drive mechanism 6.2 includes a cam 6.21, a connecting rod 6.22, a connecting handle 6.23, and a peripheral feeding drive motor 6.24. The cam 6.21 is sleeved and fixed on the output end of the peripheral feeding drive motor 6.24. The edge of the cam 6.21 is swingably connected to one end of the connecting rod 6.22 through a connecting column. The other end of the connecting rod 6.22 is swingably connected to one end of the connecting handle 6.23.

[0036] The transmission gearbox 6.3 includes a box body 6.31, an input shaft 6.32 horizontally installed and rotatably arranged in the box body 6.31, a transition shaft 6.33 vertically installed and rotatably arranged in the box body 6.31, and an output shaft 6.34. Straight gears 6.35 that mesh and drive each other are sleeved and fixed on the transition shaft 6.33 and the output shaft 6.34. Bevel gears 6.36 that mesh and drive each other are sleeved and fixed on the input shaft 6.32 and the transition shaft 6.33. The other end of the connecting handle 6.23 is sleeved and fixed on one end of the input shaft 6.32. The output shaft 6.34 of the transmission gearbox 6.3 passes through the furnace cover 3.1 and is fixedly connected to the top surface of the feeding bin 6.1. The feeding bin 6.1 swings reciprocally along a fan-shaped trajectory.

[0037] During the process that the peripheral feeding drive motor 6.24 drives the cam 6.21 to rotate in a circular motion, the connecting rod 6.22 drives one end of the connecting handle 6.23 to reciprocally swing around the input shaft 6.32, and at the same time, the input shaft 6.32 of the transmission gearbox 6.3 performs reciprocating forward and reverse rotations; specifically, when the connecting column on the cam 6.21 moves from the closest end to the farthest end from the input shaft 6.32, the connecting rod 6.22 pulls the connecting handle 6.23 to swing to one side, and at the same time, drives the input shaft 6.32 to rotate forward. Under the transmission of the bevel gear 6.36 and the spur gear 6.35, the output shaft 6.34 drives the feeding bin 6.1 to swing counterclockwise around the output shaft 6.34; when the connecting column on the cam 6.21 moves from the farthest end to the closest end from the input shaft 6.32, the connecting rod 6.22 pushes the connecting handle 6.23 to swing to the other side, and at the same time, drives the input shaft 6.32 to rotate reversely. Under the transmission of the bevel gear 6.36 and the spur gear 6.35, the output shaft 6.34 drives the feeding bin 6.1 to swing clockwise around the output shaft 6.34; thus, the feeding bin 6.1 swings reciprocally in a fan-shaped trajectory under the drive of the output shaft 6.34.

[0038] The furnace charge pipe 4.4 for feeding materials to the periphery of the electrode 3.2 is fixed to the top surface of the furnace cover 3.1 of the DC submerged arc furnace 3 through a clamp. The bottom end of the furnace charge pipe 4.4 passes through the furnace cover 3.1 and is placed inside the DC submerged arc furnace 3. The top of the feeding bin 6.1 is provided with a feeding port 6.11 that is movably placed below the pipe orifice of the furnace charge pipe 4.4. When the corresponding electric slide valve 4.5 is opened, the mixed material falls into the feeding bin 6.1 from the feeding port 6.11 after passing through the corresponding furnace charge pipe 4.4. At the bottom of the feeding bin 6.1, a discharge port 6.12 is provided along the length direction. On both sides of the discharge port 6.12, two symmetrical opening and closing valve plates 6.15 are swingably arranged through hinges. The opening and closing valve plates 6.15 swing around the hinge axis of the hinge. When the opening and closing valve plates 6.15 are closed, the end faces of the two opening and closing valve plates 6.15 abut against each other to close the discharge port 6.12. At one end of the hinge axis of the opening and closing valve plate 6.15, a linkage gear 6.16 is sleeved and fixed. The linkage gears 6.16 on the two opening and closing valve plates 6.15 mesh with each other. At the other end of the opening and closing valve plate 6.15, an L-shaped swing arm 6.17 is fixed. At one end of the swing arm 6.17, a sleeve roller 6.18 is rotatably connected. At the bottom surface of the furnace cover 3.1, near the pipe orifice of the charge pipe 4.4, a support arm 8 is fixed. The output shaft 6.34 of the transmission gearbox 6.3, the charge pipe 4.4 for feeding materials to the periphery of the electrode 3.2, and the corresponding support arm 8 are arranged in a radially outward manner from the inside to the outside along the radius of the DC submerged arc furnace 3. At the bottom end of the support arm 8, an upward convex arc-shaped guide rail 8.1 is fixed. When the sleeve roller 6.18 moves from the bottom end to the top end of the arc-shaped guide rail 8.1, the hinge axis and one of the opening and closing valve plates 6.15 are driven by the swing arm 6.17 to close. At the same time, under the meshing transmission of the two linkage gears 6.16, the other opening and closing valve plate 6.15 also closes synchronously until the sleeve roller 6.18 moves to the highest point of the arc-shaped guide rail 8.1, and the two opening and closing valve plates 6.15 are closed. At this time, it is convenient for the feeding bin 6.1 to receive materials. When the material receiving is completed and the feeding bin 6.1 swings away from the arc-shaped guide rail 8.1, that is, the sleeve roller 6.18 moves from the top end to the bottom end of the arc-shaped guide rail 8.1. During this process, the sleeve roller 6.18 gradually gets out of the limit of the arc-shaped guide rail 8.1. Under the action of the gravity of the mixed materials, the opening and closing valve plates 6.15 gradually open and start to feed materials downward.

[0039] A material leveling structure 6.13 is arranged in the feeding bin 6.1. The material leveling structure 6.13 includes two grate plates 6.131 fixed to the inner wall of the feeding bin 6.1. One ends of the two grate plates 6.131 are butted and fixed at the feeding port 6.11 of the feeding bin 6.1. The grate plates 6.131 are arranged obliquely downward along the length direction of the feeding bin 6.1 from the feeding port 6.11 of the feeding bin 6.1. The peripheries of the grate plates 6.131 are all fixedly attached to the inner wall of the feeding bin 6.1. At intervals below each grate plate 6.131 to the discharge port 6.12 of the feeding bin 6.1, a number of material dividing partitions 6.132 are fixedly arranged. The mixed materials falling into the feeding bin 6.1 are first dispersed along the grate plates 6.131, and then fall into the furnace downward through the spaces between adjacent material dividing partitions 6.132, realizing dispersed material dropping and avoiding the phenomenon of fixed-point stockpiling.

[0040] The initial state of the opening and closing valve plate 6.15 is closed. Correspondingly, the electric slide valve 4.5 of the feeding device 4 is opened, and the mixed material is fed into the feeding bin 6.1. After the reduction amount in the weighing bin 4.1 monitored by the weighing sensor 4.11 reaches the set value, the electric slide valve 4.5 is closed. The feeding bin 6.1 is controlled by the peripheral feeding driving motor 6.24 to swing. During this process, the sleeve roller 6.18 gradually disengages from the limit of the arc-shaped guide rail 8.1. Under the action of the gravity of the mixed material, the opening and closing valve plate 6.15 gradually opens, and starts to uniformly feed downward, realizing the uniform feeding to the peripheral position of the electrode 3.2. After the feeding is completed, the peripheral feeding driving motor 6.24 drives the feeding bin 6.1 to swing to the initial position, so that the feeding port 6.11 of the feeding bin 6.1 is placed below the pipe orifice of the charging pipe 4.4, and continues to receive materials.

[0041] At the bottom surface of the furnace cover 3.1 above each feeding bin 6.1, an arc-shaped hanging rail 6.4 is fixedly connected. On the top surface of the feeding bin 6.1, a connecting piece 6.5 that slides along the hanging rail 6.4 is fixed. The connecting piece 6.5 includes a fixing frame and symmetric rollers rotatably connected to the fixing frame. The rollers roll along the hanging rail 6.4. The hanging rail 6.4 and the connecting piece 6.5 play a role in carrying the feeding bin 6.1, and the peripheral feeding driving motor 6.24 controls the feeding bin 6.1 to make a reciprocating swinging motion along the hanging rail 6.4.

[0042] It further includes a cooling device 7. The cooling device 7 includes a liquid inlet cavity 7.1 and a rotary joint 7.2. An inlet liquid channel 6.341 and a drain liquid channel 6.342 are provided in the output shaft 6.34 of the transmission gearbox 6.3. A coolant circulation sandwich layer 6.14 communicating with the inlet liquid channel 6.341 and the drain liquid channel 6.342 is provided on the side wall of the feeding bin 6.1. The liquid inlet cavity 7.1 is fixedly connected to the top surface of the box body 6.31. The top end of the output shaft 6.34 of the transmission gearbox 6.3 sequentially passes through the box body 6.31 and the liquid inlet cavity 7.1 upward in a sealed manner, and the output shaft 6.34 is rotatably connected to the liquid inlet cavity 7.1. An inlet liquid port 6.343 communicating with the inlet liquid channel 6.341 is opened on the output shaft 6.34 in the liquid inlet cavity 7.1, and a liquid inlet pipe 7.3 is connected to the liquid inlet cavity 7.1. A rotary joint 7.2 is connected to the drain liquid channel 6.342 of the output shaft 6.34, and the outer wall of the rotary joint 7.2 is fixed to the box body 6.31. Cooling water is fed through the liquid inlet pipe 7.3, flows into the inlet liquid channel 6.341 from the inlet liquid port 6.343, then flows into the coolant circulation sandwich layer 6.14 to cool the feeding bin 6.1, and the cooled water is discharged from the coolant circulation sandwich layer 6.14 through the drain liquid channel 6.342, thereby prolonging the service life of the feeding bin 6.1.

[0043] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A feeding system for producing ferroalloy in a DC submerged arc furnace, characterized in that, It includes a first platform, a second platform, a furnace cover, and several sets of feeding devices for feeding materials to the center and the periphery of the electrodes respectively; A central feeding device is connected to the furnace cover at the center of the electrode, and a peripheral feeding device is connected to the furnace cover at the periphery of the electrode; The feeding device includes a weighing bin, an upper section of a material pipe, a lower section of a material pipe, and a material pipe for entering the furnace; The weighing bin is installed on the first platform, the upper section of the material pipe is vertically penetrated and fixed on the second platform, the bottom discharge port of the weighing bin is connected to the top end of the upper section of the material pipe, and one end of the lower section of the material pipe is connected to the bottom end of the upper section of the material pipe; the other end of the lower section of the material pipe is connected to the pipe orifice of the material pipe for entering the furnace, and an electric slide valve is installed on the upper section of the material pipe; The material pipe for entering the furnace for feeding materials to the periphery of the electrode is fixed on the top surface of the furnace cover of the DC submerged arc furnace, and the bottom end of the material pipe for entering the furnace passes through the furnace cover and is placed inside the DC submerged arc furnace; the material pipe for entering the furnace for feeding materials to the center of the electrode is communicated with the guide cylinder of the central feeding device.

2. The feeding system for ferroalloy production in a DC submerged arc furnace according to claim 1, wherein An insulating short section is connected to the position of the lower section of the material pipe adjacent to the furnace cover. The insulating short section includes a steel pipe, and first flange plates sleeved and welded at both ends of the steel pipe. An insulating ring plate is clamped between each first flange plate through a second flange plate and fixed by passing through bolts. An insulating sleeve is sleeved on the bolts, and insulating washers abutting against the corresponding first flange plates and second flange plates are sleeved at both ends of the bolts; a high-temperature resistant castable layer is provided on the inner wall of the steel pipe, and anchor hooks are embedded in the high-temperature resistant castable layer.

3. The feeding system for ferroalloy production in a DC submerged arc furnace according to claim 1, characterized in that, The lower section of the material pipe is connected and fixed to the second platform through a tie rod assembly. The tie rod assembly includes two screw rods connected by a turnbuckle. Both ends of the tie rod assembly are connected to the second platform and the lower section of the material pipe respectively through insulating porcelain bottles.

4. A feeding system for ferroalloy production in a DC submerged arc furnace according to claim 1, characterized in that, The central feeding device includes a central feeding driving motor, a driving shaft, and a guide cylinder; the guide cylinder is hermetically penetrated and fixed at the center of the furnace cover. The central feeding driving motor is fixed on the top surface of the guide cylinder. A rotatable driving shaft is coaxially arranged inside the guide cylinder. The top end of the driving shaft is coaxially and drivingly connected to the output end of the central feeding driving motor. The bottom end of the driving shaft is fixed with a material leveling plate placed below the orifice of the guide cylinder. Material leveling plates are circumferentially and uniformly fixed on the top surface of the material leveling plate.

5. The feeding system for ferroalloy production in a DC submerged arc furnace according to claim 4, characterized in that, The lower part of the guide cylinder is of a converging structure, and the diameter of the orifice of the guide cylinder is less than or equal to the diameter of the material leveling plate.

6. A feeding system for producing ferroalloys in a DC submerged arc furnace according to any one of claims 1 to 5, characterized in that The peripheral feeding device includes a feeding bin, and a driving mechanism and a transmission gearbox installed on the top surface of the furnace cover; the driving mechanism is connected to the input shaft of the transmission gearbox, and the output shaft of the transmission gearbox passes through the furnace cover and is fixedly connected to the top surface of the feeding bin; the feeding bin swings reciprocally along a fan-shaped trajectory. A feeding port is opened at the top of the feeding bin and is movably placed below the pipe orifice of the material pipe for entering the furnace; a discharge port is opened at the bottom of the feeding bin, and an opening and closing valve plate is swingably arranged at the discharge port. A material leveling structure is arranged inside the feeding bin.

7. The feeding system for ferroalloy production in a DC submerged arc furnace according to claim 6, characterized in that, An arc-shaped suspension rail is fixedly connected to the bottom surface of the furnace lid above each of the feeding bins, and a connecting member that slides along the suspension rail is fixed to the top surface of the feeding bin.

8. A feeding system for ferroalloy production in a DC submerged arc furnace according to claim 6, characterized in that, The material leveling structure includes two grate plates fixed to the inner wall of the feeding bin. One end of the two grate plates is butted and fixed at the feeding port of the feeding bin, and the grate plates are inclined downward from the feeding port of the feeding bin; a number of material distribution partition plates are fixedly arranged at intervals from below each grate plate to the discharge port of the feeding bin.

9. A feeding system for ferroalloy production in a DC submerged arc furnace according to claim 6, characterized in that, The driving mechanism includes a cam, a connecting rod, a connecting handle and an outer feeding driving motor; the cam is sleeved and fixed on the output end of the outer feeding driving motor, the edge of the cam is swingably connected to one end of the connecting rod through a connecting column, and the other end of the connecting rod is swingably connected to one end of the connecting handle; The transmission gearbox includes a box body, a horizontally arranged input shaft, a vertically arranged intermediate shaft and an output shaft. Straight gears that mesh and drive each other are sleeved and fixed on the intermediate shaft and the output shaft, and bevel gears that mesh and drive each other are sleeved and fixed on the input shaft and the intermediate shaft; the other end of the connecting handle is sleeved and fixed on one end of the input shaft.

10. A feeding system for producing ferroalloy in a DC submerged arc furnace according to claim 9, characterized in that, It further includes a cooling device, and the cooling device includes a liquid inlet cavity and a rotary joint; a liquid inlet channel and a liquid discharge channel are arranged in the output shaft of the transmission gearbox, and a coolant circulation sandwich layer communicating with the liquid inlet channel and the liquid discharge channel is arranged on the side wall of the feeding bin; the liquid inlet cavity is fixedly connected to the top surface of the box body, the top end of the output shaft of the transmission gearbox sequentially passes through the box body and the liquid inlet cavity upward in a sealed manner, a liquid inlet communicating with the liquid inlet channel is formed on the output shaft in the liquid inlet cavity, and a liquid inlet pipe is connected to the liquid inlet cavity; a rotary joint is connected to the liquid discharge channel of the output shaft, and the outer wall of the rotary joint is fixed to the box body.

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