A swing and pry type feeding device and feeding system for a submerged arc furnace

Abstract

The application discloses a swing and pry type feeding device and feeding system of an electric arc furnace, and belongs to the technical field of electric arc furnace metallurgy. The feeding device comprises an outer rotating drum which is rotationally connected with an external pipe, a chute which is hingedly connected to the bottom of the outer rotating drum, and a swing mechanism which is arranged on a top cover of a smoke hood to drive the outer rotating drum to swing horizontally and reciprocally, and a pry mechanism which is arranged on the outer rotating drum to drive the chute to rotate reciprocally and throw materials. The feeding system is further provided with a jumping correction mechanism, a shielding smoke overflow mechanism and a cooling mechanism which are respectively used for correcting coaxiality of the outer rotating drum, blocking smoke overflow and cooling the device. The feeding system is based on a degree circle of a small face and a large face feeding area in the electric arc furnace, and a central pipe and multiple sets of feeding devices are arranged on the top cover of the smoke hood to realize full coverage of the feeding area in the electric arc furnace. The feeding device adopts a feeding mode combining swing and pry, and solves the problems of uneven feeding, smoke overflow and easy ablation of the equipment caused by high temperature in the traditional feeding mode, improves feeding uniformity and efficiency, and prolongs the service life of the equipment.

Description

Technical Field

[0001] This invention belongs to the field of submerged arc furnace metallurgical technology, and specifically relates to a oscillating and skid-driven feeding device and feeding system for a submerged arc furnace. Background Technology

[0002] Submerged arc furnaces are mainly used for reducing smelting of raw materials such as ores, carbonaceous reducing agents, and solvents to produce ferroalloys such as ferrosilicon, ferromanganese, ferrochrome, ferrotungsten, ferrosilicon manganese, ferrosilicon calcium, and ferronickel alloys, as well as industrial silicon and calcium carbide. Their products are important raw materials, additives, and calcium carbide chemical raw materials in the metallurgical industry.

[0003] Submerged arc furnaces typically use special carbonaceous or magnesia-based refractory materials as linings and employ self-growing or graphite electrodes. One end of the electrode is inserted into the charge layer for submerged arc operation, forming an electric arc within the charge layer. The heat energy from the electric arc and the heat energy generated by the resistance of the charge layer through the current are used to reduce metals and smelt alloys. Due to the smelting process of submerged arc furnaces, continuous charging and intermittent slag removal are necessary to ensure continuous operation.

[0004] Currently, there are three charging methods for electric arc furnaces: 1. Fixed feed pipe feeding method: The raw materials with qualified particle size are weighed in the daily feed silo and mixed in a sandwich manner. The mixture is then sent to the furnace top feed silo via the feeding belt. The required furnace material is then added to a fixed position in the furnace through the feeding system, which includes feed pipe, feed pipe hydraulic gate, quantitative feed silo, air injector, wear-resistant elbow, and fixed discharge nozzle.

[0005] 2. Feeding method of the feeding car: The raw materials with qualified particle size are mixed evenly in the specified material ratio and sandwich method and sent to the smelting platform. The feeding car then feeds the furnace charge into the furnace.

[0006] 3. Manual feeding method: The raw materials with qualified particle size are mixed evenly in the specified material ratio and sandwich method and then sent to the smelting platform. The furnace charge is then manually fed into the furnace.

[0007] The existing feeding method has the following problems: 1. Fixed feed pipe feeding method: Due to the space limitations of other equipment occupying the upper part of the electric arc furnace hood, only a few fixed feed pipes can be set up to feed the furnace at fixed points. This results in the newly added furnace material not being able to cover the entire crucible area, causing uneven feeding, which leads to increased power consumption and affects output.

[0008] 2. Charging method using a charging car: Due to space limitations in most factories, the mechanical efficiency of the charging car cannot be fully utilized, and manual assistance is still required for charging. Because of its structural limitations, the charging car needs to work in conjunction with a furnace tamping machine. In actual production, uneven material distribution often causes fluctuations in furnace conditions, leading to increased energy consumption.

[0009] Machinery such as feeding carts and furnace tampers can sometimes collide with electrodes, furnace doors, pressure rings, protective sleeves, and other equipment due to improper operation or unexpected factors, which can easily cause major production accidents.

[0010] 3. Manual feeding method: The furnace charge is manually fed from outside the furnace to the area inside the furnace that needs to be fed. This feeding method has problems such as harsh working environment (high temperature), high labor intensity for workers, low efficiency, and inaccurate mixing ratio during feeding, which is not conducive to production output and quality.

[0011] When the charging port is opened, flue gas and dust inside the furnace escape outward through the charging port, causing heat loss from the furnace and releasing toxic and harmful fumes and dust outside the furnace, polluting the environment and endangering the health of workers. In particular, when abnormal furnace pressure causes material collapse and splashing, the molten liquid splashing outward can easily cause burns to workers. Summary of the Invention

[0012] One object of the present invention is to provide a swinging, lever-operated feeding device for an electric arc furnace, including a top cover of the electric arc furnace fume hood and an external material pipe fixed to the upper part of the top cover of the electric arc furnace fume hood, and a feeding device body. The feeding device body includes an outer rotating cylinder rotatably connected to the external material pipe. The bottom of the outer rotating cylinder extends downward into the top cover of the fume hood. The bottom of the outer rotating cylinder is provided with a chute hinged thereto. The top cover of the fume hood is provided with a swinging mechanism for driving the outer rotating cylinder to swing horizontally back and forth. The outer rotating cylinder is provided with a levering mechanism for driving the chute to rotate back and forth along the hinge point between it and the outer rotating cylinder. The chute is used to throw material into the electric arc furnace.

[0013] Furthermore, the swing mechanism includes a first telescopic cylinder, the bottom of the first telescopic cylinder and the head of the piston rod are both provided with a first lug, the top cover of the smoke hood is provided with a bearing seat, the outer rotating cylinder is provided with a first lug seat, the bottom of the first telescopic cylinder is hinged to the bearing seat, and the head of its piston rod is hinged to the first lug seat.

[0014] Furthermore, the prying mechanism includes a second telescopic cylinder arranged vertically, the bottom of the second telescopic cylinder and the head of the piston rod are both provided with a second lug, the outer rotating cylinder is provided with a fixed frame, the chute is provided with a second lug seat, the bottom of the second telescopic cylinder is hinged to the fixed frame, and the head of its piston rod passes through the top cover of the fume hood and is hinged to the second lug seat.

[0015] Furthermore, the outer rotating cylinder is provided with a positioning ring, the positioning ring having an annular track surface, and a guide wheel component is provided circumferentially along the annular track surface. The guide wheel component is fixed to the top cover of the smoke hood. The guide wheel component includes a slidingly nested guide wheel frame and a support frame. The support frame is located inside the guide wheel frame and is provided with a guide wheel that rotates in the horizontal direction. The guide wheel frame is set on the top cover of the smoke hood, and an adjusting bolt threadedly connected to it passes through the guide wheel frame. The end of the adjusting bolt is rotatably connected to the support frame. The adjusting bolt is arranged radially along the outer rotating cylinder. The adjusting bolt is used to adjust the contact pressure between the guide wheel and the annular track surface. The adjusting bolt is threadedly connected to a stop nut, which is used to limit the adjusting bolt.

[0016] Furthermore, the top cover of the fume hood is provided with an annular hood, which is coaxially arranged with the outer rotating cylinder. The annular hood includes a bottom plate, a top plate above the bottom plate, outer side plates along the outer edges of the bottom plate and the top plate, and air duct plates parallel to and spaced apart from the annular track surface along the inner edge of the bottom plate. A guide plate is inclined along the inner edge of the top plate, and an inclined portion parallel to and spaced apart from the guide plate is provided on the upper part of the air duct plate. The annular hood is provided with an inlet for connecting an external air supply pipe. External air is introduced into the electric arc furnace along the gap between the annular track surface and the bottom plate to shield the flue gas.

[0017] Furthermore, a rotating shaft is provided between the outer rotating cylinder and the chute, the outer rotating cylinder is provided with spaced first connecting seats, a first sleeve is provided between the first connecting seats, the connecting plates on both sides of the chute are provided with second connecting seats, the first sleeve is sleeved in the center of the rotating shaft, and a partition is provided inside the first sleeve to divide the cavity between the first sleeve and the rotating shaft into a first cavity and a second cavity. The rotating shaft is symmetrically provided with a fourth cavity and a fifth cavity on both sides. The two ends of the rotating shaft are respectively rotatably sealed with a second sleeve. A third cavity is formed between the second sleeve and the rotating shaft. The fourth cavity is connected to the first cavity and a third cavity on one side. The fifth cavity is connected to the second cavity and a third cavity on the other side. The second connecting seat is a hollow structure, with the two second connecting seats on both sides respectively fitted onto the two second sleeves and communicating with the second cavity. The chute is provided with a cooling channel, one end of which communicates with one side of the second connecting seat, and the other end of which communicates with the other side of the second connecting seat. The outer rotating cylinder has an inlet channel and an outlet channel inside its wall. The inlet channel is connected to the first cavity, and the outlet channel is connected to the second cavity. The outer rotating cylinder has an inlet connector that is connected to the inlet channel and an outlet connector that is connected to the outlet channel. Both the inlet and outlet connectors are used to connect to the coolant supply line and the coolant return line.

[0018] Another objective of this invention is to provide a charging system for a submerged arc furnace, employing the aforementioned charging device. The charging system includes multiple sets of charging devices installed on the top cover of the submerged arc furnace hood. Three electrodes are arranged circumferentially around the furnace core of the submerged arc furnace. A charging device is installed at the intersection point K of the extension line F connecting the furnace core and the electrode center and the small-face feeding interval circle inside the submerged arc furnace. The extension line F intersects the furnace core, and the angle bisector L is the angle between adjacent extension lines F. A charging device is installed at the intersection point P of the angle bisector L and the large-face feeding interval circle inside the submerged arc furnace. A central feed pipe is provided above the furnace core of the submerged arc furnace, and the charging area of ​​the central feed pipe is V.

[0019] Furthermore, the feeding coverage area of ​​the feeding device at point K is a fan-shaped area W with point K as the center and a radius less than the distance R1 from point K to the center of the electrode, where R1 is the range of the thrown furnace charge; the feeding coverage area of ​​the feeding device at point P is a fan-shaped area Z with point P as the center and a radius less than the distance R2 from point P to the outer perimeter of the feeding area V of the central material pipe.

[0020] The present invention has the following beneficial effects.

[0021] 1. In the feeding device of the present invention, the outer rotating cylinder and the external material pipe adopt a rotating connection structure. The swinging mechanism drives the outer rotating cylinder to swing horizontally back and forth through the extension and retraction of the first telescopic cylinder. The outer rotating cylinder drives the chute to swing horizontally in sync through its hinged structure with the chute. At the same time, the prying mechanism drives the chute to rotate back and forth around its hinge point with the outer rotating cylinder through the extension and retraction of the second telescopic cylinder, thereby forming a certain throwing angle. Through the synergistic effect of the two motion modes of swinging and prying, the material can be evenly thrown into the electric arc furnace with a composite motion trajectory. Compared with the traditional feeding method, the feeding device of the present invention significantly improves the uniformity of feeding through the combination of reciprocating swinging and prying feeding.

[0022] 2. The feeding device is equipped with a runout correction mechanism. By adjusting the pressure of the guide wheel on the annular track surface, the rotational coaxiality of the outer drum is corrected, which helps to solve the radial runout problem when the outer drum rotates in both directions.

[0023] 3. The feeding device is equipped with a mechanism to prevent flue gas from overflowing. External fresh air enters through the inlet of the annular hood, flows sequentially through the annular cavity between the duct plate and the outer side plate, and through the channel between the guide plate and the inclined part of the duct plate, and finally is introduced into the electric arc furnace along the gap between the bottom plate and the annular track surface of the positioning ring. This airflow forms a slightly positive pressure air curtain in the furnace, effectively preventing high-temperature flue gas from overflowing from the connection between the feeding device and the top cover of the hood, while avoiding the heat loss, environmental pollution, and safety hazards caused by flue gas injection in traditional feeding methods.

[0024] 4. The charging device incorporates a highly efficient cooling channel system connected to the main cooling circulation system of the electric arc furnace (EAF). This system enables forced cooling circulation of the outer rotating cylinder and chute, which pass through the top cover of the EAF and extend into the furnace chamber. Coolant flows from the inlet connector into the inlet channel of the outer rotating cylinder, through the cavity of the rotating shaft into the cooling channel of the chute, and then flows out through another cavity of the rotating shaft and the outlet channel of the outer rotating cylinder, returning to the heat dissipation tower of the EAF cooling circulation system for further cooling. This forced cooling circulation effectively reduces the risk of erosion damage to the charging device caused by high temperatures within the furnace, significantly extending the service life of the charging device. 5. The EAF charging system of this invention is based on the furnace core and electrode positions, and constructs a charging system based on the small-area and large-area feeding differentiation circles within the furnace. A central feed pipe and multiple sets of charging mechanisms are installed at the top cover of the EAF. Through precise point layout and motion control, the system divides the charging area inside the furnace into a core charging area and multiple fan-shaped charging zones, achieving full coverage of the entire crucible area in the furnace. This effectively solves the problems of uneven material distribution and insufficient area coverage in traditional charging methods, and significantly improves the uniformity and efficiency of charging in electric arc furnaces. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the feeding device in this invention.

[0026] Figure 2 This is a schematic diagram of the chute prying trajectory in this invention.

[0027] Figure 3 yes Figure 2 A magnified cross-sectional view of point A in the middle.

[0028] Figure 4 This is a top view schematic diagram of the annular shroud structure in this invention.

[0029] Figure 5 yes Figure 2 A magnified schematic diagram of the structure at point B in the middle.

[0030] Figure 6 yes Figure 4 A schematic diagram of the cross-sectional structure at point CC.

[0031] Figure 7 This is a three-dimensional structural diagram of the rotating connection between the outer rotating drum and the chute in this invention.

[0032] Figure 8 This is a schematic diagram of the internal cross-sectional structure of the rotating connection between the outer rotating drum and the chute in this invention.

[0033] Figure 9 This is a schematic diagram of the flow path of the coolant along the outer rotating cylinder, rotating shaft, and chute in this invention.

[0034] Figure 10 This is a three-dimensional structural diagram of the feeding system in this invention.

[0035] Figure 11 This is a schematic diagram showing the location of the feeding device in the furnace corresponding to the feeding system.

[0036] Figure 12 This is a schematic diagram of the material spreading range within the furnace corresponding to the feeding device in the feeding system.

[0037] Figure 13 This is a schematic diagram of the swing trajectory of the outer rotating drum. In the diagram: 100, top cover of the fume hood; 101, external material pipe; 102, turntable; 103, reinforcing flange ring; 104, casting and bridging platform; 105, central material pipe; 106, electrode; 107, small-face feeding interval circle; 108, large-face feeding interval circle; 200, outer rotating drum; 210, positioning ring; 211, annular track surface; 220, first connecting seat; 230, liquid inlet channel; 231, liquid outlet channel; 300, chute; 301, second lug; 302, first tank; 303, second tank; 304, second connecting seat; 305, cooling channel; 400, swing mechanism; 410, shaft seat; 420, first telescopic cylinder; 430, first lug; 500, prying mechanism; 510, second telescopic cylinder; 520, fixed frame. 600. Shielding mechanism for escaping flue gas overflow; 610. Annular hood; 611. Inlet; 612. Base plate; 613. Outer side plate; 614. Top plate; 615. Guide plate; 616. Air duct plate; 617. Connecting frame; 700. Guide wheel component; 701. Guide wheel; 702. Support frame; 703. Guide wheel frame; 704. Anti-reverse nut; 705. Adjusting bolt; 810. Liquid inlet connector; 820. Liquid outlet connector; 830. Rotating shaft; 831. Fourth cavity; 832. Fifth cavity; 833. First flow channel hole; 834. Second flow channel hole; 835. Third flow channel hole; 836. Fourth flow channel hole; 840. First sleeve; 841. First cavity; 842. Second cavity; 850. Second sleeve; 851. Third cavity. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0039] Example 1

[0040] Reference Figure 1This embodiment discloses a swing and lever-type feeding device for a submerged arc furnace, including a feeding device body. The feeding device body is installed on the top cover 100 of the fume hood of the submerged arc furnace. An external material pipe 101 is fixed on the upper part of the top cover 100 of the fume hood of the submerged arc furnace. The external material pipe 101 is connected to the feeding device body. The raw material enters the feeding device body through the external material pipe 101 and is evenly sprinkled into the submerged arc furnace through the feeding device body.

[0041] The main body of the feeding device includes an outer rotating drum 200, a chute 300, a swing mechanism 400, and a prying mechanism 500.

[0042] Reference Figure 2 The outer rotating cylinder 200 adopts a cylindrical structure that runs vertically through the cylinder, and its top is rotatably connected to the outer material pipe 101. Specifically, (refer to...) Figure 5 The end of the external material pipe 101 is connected to a turntable 102 via a flange. The turntable 102 is rotatably connected to the outer rotating cylinder 200. The turntable 102 is used to support the weight of the outer rotating cylinder 200. The bottom of the outer rotating cylinder 200 is inserted into the top cover 100 of the fume hood.

[0043] The chute 300 includes a first trough 302 and a second trough 303. The inner surface of the first trough 302 is flat and the whole is a straight trough. The second trough 303 is connected to the first trough 302. The cross-section of the inner surface of the second trough 303 is arc-shaped. The ends of the connecting plates on both sides of the inner surface of the second trough 303 are provided with second connecting seats 304. Correspondingly, the outer rotating cylinder 200 is provided with two first connecting seats 220 at intervals. The first connecting seats 220 and the second connecting seats 304 are connected by a rotating shaft to realize the hinge connection between the chute 300 and the outer rotating cylinder 200. The bottom of the outer rotating cylinder 200 is always inside the second trough 303 of the chute 300.

[0044] Reference Figure 1 The swing mechanism 400 includes a first telescopic cylinder 420, which is a telescopic double-acting cylinder. The bottom of the first telescopic cylinder 420 and the piston rod head are respectively provided with lugs. The top surface of the smoke hood cover 100 is provided with a bearing seat 410, and a pin is provided on the bearing seat 410. The lugs located at the bottom of the first telescopic cylinder 420 are hinged to the pin on the bearing seat 410. The side wall of the outer rotating cylinder 200 is correspondingly provided with a first lug seat 430, and the lugs located at the piston rod head of the first telescopic cylinder 420 are hinged to the first lug seat 430 by a pin.

[0045] The above settings enable the first telescopic cylinder 420 to be located on one side of the outer rotating cylinder 200. The first telescopic cylinder 420 drives the outer rotating cylinder 200 to reciprocate and swing horizontally within a certain angle range through the first ear seat 430.

[0046] Reference Figure 2The prying mechanism 500 includes a second telescopic cylinder 510, which is a telescopic double-acting cylinder. The cylinder body and piston rod head of the second telescopic cylinder 510 are respectively provided with lugs. The second telescopic cylinder 510 is fixed to the surface of the outer rotating cylinder 200 via a fixing bracket 520. The bottom of the second telescopic cylinder 510 is hinged to the fixing bracket 520. The second telescopic cylinder 510 is vertically arranged, and the lugs on its bottom piston rod head pass through the smoke hood top cover 100 (see reference). Figure 3 The free end of the second trough 303 of the chute 300 is provided with a second ear seat 301, and the second ear seat 301 is hinged to the piston rod head of the second telescopic cylinder 510 by a pin.

[0047] The above settings enable the second telescopic cylinder 510 to drive the chute 300 to move, and rotate it back and forth at a certain angle with the hinge point between the chute 300 and the outer rotating cylinder 200 as the center, so as to achieve the throwing of materials.

[0048] The working process of this embodiment: Material in the external feed pipe 101 flows into the chute 300 through the outer rotating cylinder 200. The first telescopic cylinder 420 extends and retracts, causing the outer rotating cylinder 200 to swing back and forth in the horizontal direction within a certain angle. Correspondingly, the outer rotating cylinder 200 causes the chute 300 to swing back and forth in the horizontal direction. At the same time, the second telescopic cylinder 510 extends and retracts, causing the chute 300 to rotate back and forth around its hinge position with the outer rotating cylinder 200 by a certain angle, realizing the prying operation. By combining the swinging and prying, the material is evenly thrown into the furnace body through the chute 300.

[0049] Example 2

[0050] Reference Figure 3 This embodiment discloses a swing and lever-type feeding device for a submerged arc furnace. The feeding device is equipped with a runout correction mechanism to solve the radial runout problem when the outer rotating drum 200 rotates in both directions.

[0051] The runout correction mechanism includes a guide wheel component 700.

[0052] The smoke hood top cover 100 has a through hole for the outer rotating cylinder 200 to pass through. A reinforcing flange ring 103, coaxial with the through hole, is located above the through hole and is fixedly connected to the smoke hood top cover 100. Multiple sets of guide wheel components 700 are circumferentially arranged on the reinforcing flange ring 103. The guide wheel components 700 are symmetrically arranged in pairs on the reinforcing flange ring 103, and the distance between adjacent guide wheel components 700 is equal. In this embodiment, there are 6 sets of guide wheel components 700. The 6 sets of guide wheel components 700 are evenly distributed at a 60° angle around the outer circumference of the outer rotating cylinder 200 and are symmetrical in pairs.

[0053] Furthermore, a casting and bridging material platform 104 is provided along the top surface of the reinforcing flange to isolate the heat transfer from the fume hood top cover 100 to the guide wheel component 700, thus protecting the guide wheel 701 for normal operation.

[0054] The guide wheel component 700 includes a guide wheel 701, a guide wheel frame 703, and a support frame 702. The support frame 702 is slidably nested in the guide wheel frame 703. The guide wheel 701 is rotatably disposed on the support frame 702. One side of the guide wheel 701 is located outside the support frame 702. The guide wheel 701 rotates in the horizontal direction.

[0055] An adjusting bolt 705, threadedly connected to the guide wheel frame 703, passes through the guide wheel frame 703 and is rotatably connected to the support frame 702. A locking nut 704 is located on one side of the guide wheel frame, threadedly connected to the adjusting bolt 705, and fitting against the guide wheel frame 703 to limit the adjustment bolt 705. The adjusting bolt 705 is arranged radially along the outer rotating cylinder 200 and is used to adjust the radial pressure between the guide wheel 701 and the outer rotating cylinder 200.

[0056] A positioning ring 210 is provided on the outer surface of the outer rotating cylinder 200. The outer vertical sidewall of the positioning ring 210 is an annular track surface 211. The guide wheel 701 rotates along the annular track surface 211. Through multiple sets of guide wheels 701 arranged in pairs opposite to each other, the positioning ring 210 is rolled and limited to prevent the outer rotating cylinder 200 from jumping vertically.

[0057] The working process of this embodiment: The outer rotating cylinder 200 is provided with a positioning ring 210. The piston rod of the second telescopic cylinder 510 passes downward through the positioning ring 210 in the direction perpendicular to the positioning ring 210. The positioning ring 210 is provided with space for displacement of the piston rod during telescopic movement. Six sets of guide wheel components 700 are evenly arranged around the circumference of the outer rotating cylinder 200. The guide wheel components 700 are opposite each other in pairs. By rotating the adjusting bolt 705, the pressure of the guide wheel 701 on the annular track surface 211 of the positioning ring 210 can be adjusted. The rotational coaxiality of the outer rotating cylinder 200 is corrected by the cooperation of multiple sets of guide wheel components 700, which helps to reduce the radial runout when the outer rotating cylinder 200 rotates in both directions.

[0058] Example 3

[0059] This embodiment is a further improvement on embodiment 2.

[0060] Reference Figure 1 This embodiment discloses a swing-and-lever type feeding device for a submerged arc furnace, which is equipped with a flue gas overflow shielding mechanism 600.

[0061] Reference Figure 3 and Figure 6 The smoke overflow shielding mechanism 600 includes an annular hood 610, which is mounted on a reinforcing flange ring 103 and is coaxial with the outer rotating cylinder 200. The annular hood 610 includes a base plate 612, a top plate 614, outer side plates 613, a guide plate 615, and a duct plate 616. The base plate 612 is fixed to the reinforcing flange ring 103. The top plate 614 is arranged parallel to and spaced above the base plate 612. The outer side plates 613 are respectively connected to the top plate 614 and the base plate 616. The outer edge of 12 is connected, the guide plate 615 is inclined to the side of the outer rotating cylinder 200, the high end of the guide plate 615 is connected to the inner edge of the top plate 614, and its low end is close to the positioning ring 210. The air duct plate 616 is vertically connected to the inner edge of the bottom plate 612. The upper part of the air duct plate 616 has an inclined part, which is parallel and spaced from the guide plate 615. The air duct plate 616 and the annular track surface 211 of the positioning ring 210 are spaced to form an annular flow channel. The bottom plate 612 is spaced from the annular track surface 211.

[0062] The annular shroud 610 forms three interconnected flow channels. The first flow channel is between the duct plate 616 and the outer side plate 613. The second flow channel is between the guide plate 615 and the inclined part on the upper part of the duct plate 616. The third flow channel is between the duct plate 616 and the annular track surface 211.

[0063] The annular hood 610 has a connecting channel on its outer side, and an inlet 611 at the end of the connecting channel for connecting to an external air supply pipe.

[0064] The annular hood 610 adopts a two-half symmetrical bolted structure. Each half of the annular hood 610 is evenly provided with a mating frame 617. The mating frames 617 on both sides are aligned and fixed by bolts.

[0065] The working process of this embodiment: Fresh air is drawn from the blast system of the electric arc furnace and enters the annular hood 610 through inlet 611. It flows sequentially through the first, second, and third flow channels, and then downwards into the furnace along the gap between the bottom plate 612 and the annular track surface 211. The slight positive pressure created by the fresh air passing through the annular hood 610 within the furnace effectively prevents the escape of high-temperature flue gas.

[0066] Example 4

[0067] Example 4 is a further improvement on Example 1.

[0068] Reference Figure 1 This embodiment discloses a swing-and-lever feeding device for a submerged arc furnace. The feeding device is equipped with a cooling mechanism for cooling and dissipating heat from the feeding device.

[0069] Reference Figure 3 and Figure 9The outer rotating cylinder 200 adopts a double-layer structure, with a cavity formed between the inner and outer walls of the outer rotating cylinder 200. The cavity is provided with a flow channel for coolant flow, specifically including an inlet flow channel 230 and an outlet flow channel 231. An inlet connector 810 and an outlet connector 820 are provided on the outer wall of the outer rotating cylinder 200. The inlet connector 810 is connected to one end of the inlet flow channel 230 and is used to connect to the coolant supply pipeline. The outlet connector 820 is connected to one end of the outlet flow channel 231 and is used to connect to the coolant return pipeline.

[0070] Reference Figure 7 and Figure 8 The first connecting seats 220 on both sides of the outer rotating cylinder 200 are sleeved on the rotating shaft 830 and fixedly connected to the rotating shaft 830. A first sleeve 840 is provided between the two first connecting seats 220. The first sleeve 840 is sleeved in the middle position of the rotating shaft 830, and a cavity is formed between the first sleeve 840 and the rotating shaft 830. An annular partition is provided inside the first sleeve 840. The annular partition divides the cavity between the first sleeve 840 and the rotating shaft 830 into an independent first cavity 841 and a second cavity 842. The first cavity 841 is connected to the liquid inlet channel 230 of the outer rotating cylinder 200, and the second cavity 842 is connected to the liquid outlet channel 231 of the outer rotating cylinder 200.

[0071] Reference Figure 9 The chute 300 adopts a double-layer structure. The bottom surface of the chute 300 is provided with a cooling channel 305 for the flow of coolant. The second connecting seat 304 on the connecting plates on both sides of the chute 300 adopts a hollow structure. The cooling channel 305 extends in a serpentine shape along the bottom of the chute 300. One end of the cooling channel 305 is connected to the second connecting seat 304 on one side, and the other end is connected to the second connecting seat 304 on the other side.

[0072] Reference Figure 8 The second connecting seat 304 is provided with a second sleeve 850. The second sleeve 850 is coaxially spaced and sleeved on the end of the rotating shaft 830. A third cavity 851 is formed between the second sleeve 850 and the rotating shaft 830. The second sleeve 850 and the rotating shaft 830 are sealed and rotatably connected. The second sleeve 850 is connected to the second connecting seat 304.

[0073] Reference Figure 8The rotating shaft 830 is a hollow shaft, with its middle section sealed off, forming a fourth cavity 831 and a fifth cavity 832 on both sides. The fourth cavity 831 has a first flow channel hole 833 and a second flow channel hole 834. The fourth cavity 831 communicates with the first cavity 841 through the first flow channel hole 833 and with a third cavity 851 on one side through the second flow channel hole 834. The fifth cavity 832 has a third flow channel hole 835 and a fourth flow channel hole 836. The fifth cavity 832 communicates with the second cavity 842 through the third flow channel hole 835 and with the third cavity 851 on the other side through the fourth flow channel hole 836. In this embodiment, the second flow channel hole 834 and the fourth flow channel hole 836 are located at opposite ends of the rotating shaft 830.

[0074] The above configuration enables a sequentially connected circulating cooling channel, specifically including a liquid inlet connector 810, a liquid inlet channel 230, a first cavity 841, a fourth cavity 831, a third cavity 851 on one side, a second connecting seat 304 on one side, a cooling channel 305, a second connecting seat 304 on the other side, a third cavity 851 on the other side, a fifth cavity 832, a second cavity 842, a liquid outlet channel 231, and a liquid outlet connector 820.

[0075] The working process of this embodiment: Cooling water from the large-scale cooling circulation system of the electric arc furnace enters the outer rotating drum 200 through the inlet connector 810. The cooling water then flows through the circulating cooling channel, passes through the rotating shaft 830, flows into the chute 300, and returns to the outlet connector 820. From there, it returns along the coolant pipeline to the heat dissipation tower of the large-scale cooling circulation system of the electric arc furnace for heat dissipation and cooling. This achieves cooling of both the chute 300 and the outer rotating drum 200.

[0076] Example 5

[0077] This embodiment discloses a fully automatic feeding system for a submerged arc furnace, which uses the aforementioned swing and lever-type feeding device for the submerged arc furnace.

[0078] Reference Figure 10 Each electric arc furnace is equipped with a feeding system on the top of its hood 100, which includes 6 sets of feeding devices.

[0079] Reference Figure 11 The furnace core is located at the center of the horizontal cross-section of the submerged arc furnace. Three electrodes 106 are evenly distributed circumferentially within a certain radius of the furnace core. Point K is the intersection of the extension line F connecting the furnace core and the center of electrode 106 with the feeding interval circle 107 inside the furnace. Three sets of feeding devices are installed at the three points K. The three extension lines intersect at the furnace core, forming an angle θ (refer to...). Figure 12 The angle bisector of the three included angles θ is L. The intersection of the angle bisector L and the gradation circle 108 of the large surface feeding zone inside the electric arc furnace is point P. Three other sets of feeding devices are set up at the three points P.

[0080] Reference Figure 10 A central feeding pipe 105 is installed on the top cover 100 of the electric arc furnace, corresponding to the position of the furnace core.

[0081] Reference Figure 12 and Figure 13 The feeding device located at point K on the small-face feeding differentiation circle 107, when feeding, covers a sector-shaped area W with point K as the center and a radius less than the distance R1 from point K to the center of electrode 106, where R1 is the range of the thrown furnace material, and the angle of this sector is θ and is bisected by the extension line F; the feeding device located at point P on the large-face feeding differentiation circle 108, when feeding, covers a sector-shaped area Z with point P as the center and a radius less than the distance R2 from point P to the outer perimeter of the feeding area V of the central material pipe 105, and the angle of this sector is θ and is bisected by the angle bisector L.

[0082] The charging system divides the charging area inside the electric arc furnace into a core charging area and other sector-shaped charging areas, totaling 7 charging zones, to achieve full coverage charging of the entire crucible area of ​​the furnace.

[0083] The working process of this embodiment: When other areas of the crucible zone of the electric arc furnace are short of material, the material level monitoring instrument for that area immediately sends a charging prompt to the central control room. The charging program will simultaneously display information such as the furnace top silo number and the amount of furnace charge to be added in that area on the monitoring screen. After the operator confirms that everything is correct, the charging program is started. The outlet of the buffer silo opens, and the charging trolley waiting below loads the material in a fixed quantity. After loading is completed, the charging trolley starts automatically and moves along the circular track to the silo in that area of ​​the furnace top. The charging trolley pours the furnace charge into the silo. The furnace charge pours down through the outlet of the silo, passes through the central material pipe, the electric vibrator, the wear-resistant elbow, and the end material pipe, and enters the swing and skid-type charging device.

[0084] According to the operator's remote control commands, the chute 300 of the swinging, lever-type feeding device throws furnace charge with a horizontal fan-shaped angle of θ and an upward levering angle of α (θ is the swing angle range, α is the levering angle), spreading furnace charge to the area lacking charge until the monitoring screen shows that the area and batch no longer need to be added. Finally, the operator confirms that the feeding work for the area and batch is complete, and the monitoring screen returns to the standby monitoring page for adding furnace charge. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A swing-type, skid-operated feeding device for a submerged arc furnace, comprising a top cover of the furnace fume hood and an external material pipe fixed to the upper part of the furnace fume hood top cover, characterized in that, It also includes a feeding device body, which includes an outer rotating cylinder rotatably connected to an external material pipe. The bottom of the outer rotating cylinder extends downward into the top cover of the fume hood. The bottom of the outer rotating cylinder is provided with a chute hinged thereto. The top cover of the fume hood is provided with a swing mechanism. The swing mechanism is used to drive the outer rotating cylinder to swing horizontally back and forth. The outer rotating cylinder is provided with a prying mechanism. The prying mechanism is used to drive the chute to rotate back and forth along the hinge point between it and the outer rotating cylinder. The chute is used to throw the material into the electric arc furnace. A rotating shaft is provided between the outer rotating cylinder and the chute. The outer rotating cylinder is provided with spaced first connecting seats. A first sleeve is provided between the first connecting seats. The connecting plates on both sides of the chute are provided with second connecting seats. The first sleeve is sleeved in the center of the rotating shaft. A partition is provided inside the first sleeve to divide the cavity between the first sleeve and the rotating shaft into a first cavity and a second cavity. The rotating shaft is symmetrically provided with a fourth cavity and a fifth cavity on both sides. The two ends of the rotating shaft are respectively rotatably sealed with a second sleeve. A third cavity is formed between the second sleeve and the rotating shaft. The fourth cavity is connected to the first cavity and a third cavity on one side. The fifth cavity is connected to the second cavity and a third cavity on the other side. The second connecting seat is a hollow structure, with the two second connecting seats on both sides respectively fitted onto the two second sleeves and communicating with the third cavity. The chute is provided with a cooling channel, one end of which communicates with one side of the second connecting seat, and the other end of which communicates with the other side of the second connecting seat. The outer rotating cylinder has an inlet channel and an outlet channel inside its wall. The inlet channel is connected to the first cavity, and the outlet channel is connected to the second cavity. The outer rotating cylinder has an inlet connector that is connected to the inlet channel and an outlet connector that is connected to the outlet channel. Both the inlet and outlet connectors are used to connect to the coolant supply line and the coolant return line.

2. The oscillating, skid-driven feeding device for a submerged arc furnace as described in claim 1, characterized in that, The swing mechanism includes a first telescopic cylinder, the bottom of the first telescopic cylinder and the head of the piston rod are both provided with a first lug, the top cover of the smoke hood is provided with a shaft seat, the outer rotating cylinder is provided with a first lug, the bottom of the first telescopic cylinder is hinged to the shaft seat, and the head of its piston rod is hinged to the first lug.

3. The oscillating, skid-driven feeding device for a submerged arc furnace as described in claim 1, characterized in that, The prying mechanism includes a second telescopic cylinder arranged vertically. The bottom of the second telescopic cylinder and the head of the piston rod are both provided with second lugs. The outer rotating cylinder is provided with a fixed frame. The chute is provided with a second lug seat. The bottom of the second telescopic cylinder is hinged to the fixed frame. The head of its piston rod passes through the top cover of the fume hood and is hinged to the second lug seat.

4. The oscillating, skid-driven feeding device for a submerged arc furnace as described in claim 1, characterized in that, The outer rotating cylinder is equipped with a positioning ring, which has an annular track surface. A guide wheel component is provided circumferentially along the annular track surface. The guide wheel component is fixed to the top cover of the smoke hood. The guide wheel component includes a slidingly nested guide wheel frame and a support frame. The support frame is located inside the guide wheel frame and is equipped with a guide wheel that rotates in the horizontal direction. The guide wheel frame is set on the top cover of the smoke hood. An adjusting bolt is threaded through the guide wheel frame and is rotatably connected to the support frame. The adjusting bolt is arranged radially along the outer rotating cylinder and is used to adjust the contact pressure between the guide wheel and the annular track surface. The adjusting bolt is threadedly connected to a stop nut, which is used to limit the adjustment bolt.

5. The oscillating, skid-driven feeding device for a submerged arc furnace as described in claim 4, characterized in that, The top cover of the fume hood is provided with an annular hood, which is coaxially arranged with the outer rotating cylinder. The annular hood includes a base plate and a top plate above the base plate. The outer edges of the base plate and the top plate are provided with outer side plates. The inner edge of the base plate is provided with air duct plates that are parallel and spaced apart from the annular track surface. The inner edge of the top plate is provided with a guide plate. The upper part of the air duct plate is provided with an inclined part that is parallel and spaced apart from the guide plate. The annular hood is provided with an inlet for connecting an external air supply pipe. The external air supply is introduced into the electric arc furnace along the gap between the annular track surface and the base plate to shield the flue gas.

6. A charging system for a submerged arc furnace, characterized in that, The electric arc furnace is equipped with a swing-type, skid-type feeding device as described in any one of claims 1-5. The feeding system includes multiple sets of feeding devices installed on the top cover of the electric arc furnace hood. Three electrodes are arranged circumferentially around the furnace core. A feeding device is installed at the intersection point K of the extension line F connecting the furnace core and the electrode center and the small-face feeding interval circle inside the electric arc furnace. The extension line F intersects the furnace core. The angle bisector L of the angle between adjacent extension lines F is the angle bisector L. A feeding device is installed at the intersection point P of the angle bisector L and the large-face feeding interval circle inside the electric arc furnace. A central feed pipe is provided above the furnace core, and the feeding area of ​​the central feed pipe is V.

7. The submerged arc furnace charging system as described in claim 6, characterized in that, The feeding coverage area of ​​the feeding device at point K is a fan-shaped area W with point K as the center and a radius less than the distance R1 from point K to the center of the electrode, where R1 is the range of the thrown furnace material; the feeding coverage area of ​​the feeding device at point P is a fan-shaped area Z with point P as the center and a radius less than the distance R2 from point P to the outer perimeter of the feeding area V of the central material pipe.

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