Efficient short net for submerged arc furnace and short net tail hanging bracket

Abstract

The utility model relates to the technical field of submerged arc furnace smelting, in particular to an efficient short net and a short net tail hanging bracket for a submerged arc furnace, which comprise two rows of short net pipe groups which are horizontally arranged in parallel, and each short net pipe group is composed of a plurality of first copper pipes and a plurality of second copper pipes which are vertically arranged in a staggered mode. The two second copper pipes which are horizontally arranged at intervals and close to the tail hanging bracket are arranged in a high-low staggered mode. The tail hanging bracket comprises an assembling frame, two L-shaped outer clamping blocks vertically arranged at intervals, a plurality of Z-shaped inner clamping blocks arranged between the two outer clamping blocks, first arc-shaped clamping grooves formed in concave parts of the L-shaped outer clamping blocks, and second arc-shaped clamping grooves formed in concave parts of the two sides of the Z-shaped inner clamping blocks correspondingly. According to the utility model, the short network management groups with vertically staggered and high-low staggered tail parts are adopted, so that the inductance of the short network is reduced, the current-voltage phase difference is reduced, and the power factor and the electric energy utilization efficiency are improved; and meanwhile, the tail hanging bracket avoids the complexity of penetration of multiple copper pipes, the staggered copper pipes can be stably clamped, and the fixing requirements of complex working conditions are met.

Description

Technical Field

[0001] This utility model relates to the field of smelting technology of electric arc furnaces, specifically to a high-efficiency short mesh for electric arc furnaces and a short mesh tail hanger. Background Technology

[0002] In the smelting process of an electric arc furnace, three-phase electrodes are inserted into the raw materials inside the furnace, generating a large current through conductivity. The electric arc heat generated by the current melts the raw materials. The short grid, as a key conductor in the high-current closed loop on the low-voltage side of the electric arc furnace transformer, connects the secondary output terminal of the transformer to the vertical copper tube of the electric arc furnace, and undertakes the important function of transmitting low voltage and high current to the electrodes, holding the vertical tube and copper tiles.

[0003] Traditional electric arc furnaces use short mesh (refer to) Figure 1 Its tail structure adopts a 120° bifurcation design, and the outgoing lines are arranged horizontally in parallel with an outgoing angle of 37.5°. However, due to the influence of the short network inductance, this layout makes it easy for a phase difference to occur between the current and voltage, resulting in a decrease in the power factor and affecting the effective utilization of electrical energy. In addition, traditional short network tail hangers mostly use integrated fixed or butt joint clamps to fix multiple copper tubes of the short network. The integrated fixed hanger requires multiple copper tubes of the short network to pass through it, while the butt joint clamp is difficult to adapt to the fixing requirements of the copper tubes at the tail of the short network with staggered heights. Utility Model Content

[0004] The purpose of this invention is to provide a high-efficiency short mesh and a short mesh tail hanger for an electric arc furnace, which solves the problem that when existing devices test asphalt mixtures, although the device is equipped with a heating base to heat the asphalt mixture, it fails to simultaneously heat the rollers that simulate the wheels, thus limiting its simulation of the thermal effects of real road conditions and the overall heating efficiency, and reducing the fidelity of the testing environment.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency short mesh for a submerged arc furnace and a short mesh tail hanger, comprising two rows of horizontally arranged short mesh tube groups, a head hanger and a tail hanger respectively located at the beginning and end of the two rows of short mesh tube groups, and multiple shaping clamps and hanging clamps staggered in the middle of the two rows of short mesh tube groups. The short mesh tube group is composed of multiple first copper tubes and multiple second copper tubes arranged vertically in a staggered manner, and two horizontally spaced second copper tubes near the tail hanger are arranged at different heights in a staggered manner; the tail hanger includes an assembly frame, two vertically spaced L-shaped outer clamps, and vertically arranged... The assembly includes multiple Z-shaped inner clamping blocks arranged between two outer clamping blocks, a first arc-shaped slot opened on the recess of the L-shaped outer clamping block, second arc-shaped slots opened on the recesses on both sides of the Z-shaped inner clamping blocks, and a hanging mechanism on the upper side of the assembly frame; the inner diameter of the first and second arc-shaped slots is adapted to the outer diameter of the corresponding first and second copper tubes; the two L-shaped outer clamping blocks and the multiple Z-shaped inner clamping blocks are joined and snapped together by a mortise and tenon structure and are tightly fitted into the interior of the assembly frame; one end of the multiple first and second copper tubes respectively passes through the corresponding first and second arc-shaped slots and extends to the other side of the assembly frame.

[0006] Furthermore, the assembly frame includes a top plate and a bottom channel steel arranged at intervals from top to bottom, two side channel steels arranged at horizontal intervals between the top plate and the bottom channel steel, and insulating connection structures respectively provided on the top and bottom of the two side channel steels; the two insulating connection structures at the top are connected to the top plate, and the two insulating connection structures at the bottom are connected to the bottom channel steel.

[0007] Furthermore, the insulating connection structure includes a fixing plate disposed on the outside of the side channel steel, an insulating pad tightly fitted to one side of the fixing plate, a spring washer and a nut sequentially stacked on the upper side of the insulating pad, a hexagonal bolt threaded into the nut, and a flat washer and an insulating tube sleeved on the hexagonal bolt; the insulating tube is sandwiched between the flat washer and the fixing plate, the insulating connection structure at the bottom is connected to the lower side of the bottom channel steel by the hexagonal bolt, and the insulating connection structure at the top is connected to the top plate by the hexagonal bolt.

[0008] Furthermore, the suspension mechanism includes two connecting seats, two insulating flanges, two vertical steel pipes, and a horizontal steel pipe; the connecting seats are connected to the vertical steel pipes through insulating flanges, the horizontal steel pipe is located between the two vertical steel pipes, and the connecting seats are connected to the upper side of the top plate.

[0009] Furthermore, both the first copper tube and the second copper tube include a copper tube body, a first insulating layer, a second insulating layer, and a third insulating layer sequentially covering the outside of the copper tube body; insulating varnish is applied between the first insulating layer and the copper tube body, between the first insulating layer and the second insulating layer, between the second insulating layer and the third insulating layer, and on the outer wall of the third insulating layer; the first insulating layer is composed of two layers of mica tape, the second insulating layer is composed of two layers of fiberglass tape, and the third insulating layer is composed of two layers of white cloth tape.

[0010] Furthermore, the copper tube body is made of TU oxygen-free electrolytic copper material.

[0011] Furthermore, each of the multiple hanging clamps is provided with a connecting frame on its lower side, and both ends of the multiple connecting frames are connected to protective covers.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. This utility model adopts a short network tube group with vertical staggered arrangement and high and low staggered tail, which changes the traditional 120° bifurcation and horizontal parallel line arrangement, reduces the inductance of the short network, reduces the phase difference between current and voltage, thereby improving the power factor and improving the energy utilization efficiency.

[0014] 2. Regarding the fixing structure at the tail of the short copper tube assembly, this utility model achieves fixing of the tail of the short copper tube assembly through the coordinated operation of an assembly frame, an L-shaped outer clamping block, a Z-shaped inner clamping block, a first arc-shaped slot, a second arc-shaped slot, and a hanging mechanism. The L-shaped outer clamping block and the Z-shaped inner clamping block adopt a mortise and tenon joint structure, and the size of the arc-shaped slot is adapted to the outer diameter of the copper tube. Compared with traditional integrated fixing or butt-joint clamps, this not only avoids the cumbersome operation when multiple copper tubes are inserted, but also firmly clamps copper tubes at different heights at the tail, meeting the fixing requirements of short copper tube assemblies under complex working conditions. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of a short mesh used in a traditional submerged arc furnace;

[0016] Figure 2 This is a schematic diagram of the high-efficiency short mesh for a submerged arc furnace and the short mesh tail hanger of this utility model.

[0017] Figure 3 This is a top view schematic diagram of the high-efficiency short mesh for a submerged arc furnace and the short mesh tail hanger of this utility model;

[0018] Figure 4 This is a schematic diagram of the high-efficiency short mesh for a submerged arc furnace and the short mesh tail hanger of this utility model.

[0019] Figure 5This is a schematic diagram of the high-efficiency short mesh for a submerged arc furnace and the short mesh tail hanger of this utility model.

[0020] Figure 6 This is a side view of the tail hanger of this utility model;

[0021] Figure 7 This is a schematic diagram of the high-efficiency short mesh for a submerged arc furnace according to this utility model.

[0022] Figure 8 This is a cross-sectional schematic diagram of the copper tube body of this utility model.

[0023] In the diagram: 1. Short network tube assembly; 2. Head hanger; 3. Shaping clamp; 4. Hanging clamp; 5. Connecting frame; 6. Protective cover; 7. Tail hanger; 8. Bottom channel steel; 9. Top plate; 10. Side channel steel; 11. L-shaped outer clamp; 12. Z-shaped inner clamp; 13. First arc-shaped slot; 14. Second arc-shaped slot; 15. Connecting seat; 16. Insulating flange; 17. Vertical steel pipe; 18. Horizontal steel pipe; 19. Hex bolt; 20. Flat washer; 21. Insulating tube; 22. Insulating pad; 23. Spring washer; 24. Nut; 25. Fixing plate; 26. First copper tube; 27. Second copper tube; 28. Copper tube body; 29. ​​First insulation layer; 30. Second insulation layer; 31. Third insulation layer. Detailed Implementation

[0024] Please see Figure 2-8 A high-efficiency short mesh for a submerged arc furnace and a short mesh tail hanger are disclosed. The short mesh tube group 1 comprises two rows of horizontally arranged parallel short mesh tubes 1, a head hanger 2 and a tail hanger 7 respectively located at the head and tail ends of the two rows of short mesh tube groups 1, and multiple shaping clamps 3 and hanging clamps 4 staggered in the middle of the two rows of short mesh tube groups 1. The short mesh tube group 1 is composed of multiple vertically staggered first copper tubes 26 and multiple second copper tubes 27, with two horizontally spaced second copper tubes 27 near the tail hanger 7 arranged in a staggered height configuration. The outlet angle of the first copper tubes 26 and the second copper tubes 27 is 45°, and the tail structure is a parallel arrangement with a spacing of 360mm. The tail hanger 7 includes an assembly frame, two vertically spaced L-shaped outer clamps 11, and a vertical... The assembly frame includes multiple Z-shaped inner clamps 12 arranged side-by-side between two L-shaped outer clamps 11, a first arc-shaped slot 13 formed in the recess of the L-shaped outer clamp 11, a second arc-shaped slot 14 formed in the recesses on both sides of the Z-shaped inner clamps 12, and a hanging mechanism on the upper side of the assembly frame; the inner diameter of the first arc-shaped slot 13 and the second arc-shaped slot 14 are adapted to the outer diameter of the corresponding first copper tube 26 and second copper tube 27; the two L-shaped outer clamps 11 and the multiple Z-shaped inner clamps 12 are joined and snapped together by a mortise and tenon structure and are tightly fitted into the interior of the assembly frame; one end of the multiple first copper tubes 26 and second copper tubes 27 respectively passes through the corresponding first arc-shaped slot 13 and second arc-shaped slot 14 and extends to the other side of the assembly frame.

[0025] The two rows of short network tubes 1 adopt a vertically staggered arrangement of the first copper tube 26 and the second copper tube 27, with the second copper tube 27 at different heights set at the tail. Combined with the parallel structure of 45° cable exit angle and 360mm spacing, compared with the traditional 120° branching and 37.5° cable exit design, the inductance of the short network is reduced, the phase difference between current and voltage is reduced, the power factor is improved, and the power utilization efficiency is increased. In the tail hanger 7, the L-shaped outer clamp 11 and the Z-shaped inner clamp 12 are tightly fitted by the tenon and mortise structure, and combined with the first arc-shaped slot 13 and the second arc-shaped slot 14 whose inner diameter is adapted to the outer diameter of the copper tube, compared with the traditional integrated fixed or butt joint splicing clamp, it simplifies the installation process and can firmly clamp the staggered first copper tube 26 and the second copper tube 27 at the tail, realizing reliable fixation of the short network tube 1, and solving the problems of high power loss and inconvenient fixation of traditional short networks.

[0026] The assembly frame includes a top plate 9 and a bottom channel steel 8 arranged at intervals from top to bottom, two side channel steels 10 arranged at intervals between the top plate 9 and the bottom channel steel 8, and insulating connection structures respectively located on the top and bottom of the two side channel steels 10; the two insulating connection structures located at the top are connected to the top plate 9, and the two insulating connection structures located at the bottom are connected to the bottom channel steel 8.

[0027] The insulating connection structure includes a fixed plate 25 connected to the outside of the side channel steel 10, an insulating pad 22 tightly fitted to one side of the fixed plate 25, a spring washer 23 and a nut 24 stacked on the upper side of the insulating pad 22, a hexagonal bolt 19 threaded to the nut 24, and a flat washer 20 and an insulating tube 21 fitted onto the hexagonal bolt 19. The insulating tube 21 is sandwiched between the flat washer 20 and the fixed plate 25. The insulating connection structure at the bottom is connected to the lower side of the bottom channel steel 8 via the hexagonal bolt 19, and the insulating connection structure at the top is connected to the top plate 9 via the hexagonal bolt 19. The insulating pad 22 is tightly fitted to the fixed plate 25 and uses insulating materials (such as "silicone rubber or polytetrafluoroethylene insulating materials") to block the current conduction path and prevent safety hazards caused by stray current. The spring washer 23 cooperates with the nut 24 to generate elastic preload when the hexagonal bolt 19 is tightened, ensuring that the connection does not loosen during long-term operation and enhancing structural stability. The flat washer 20 fitted onto the hexagonal bolt 19 and the insulating tube 21 form a critical insulation barrier, wherein the insulating tube 21 isolates the bolt from direct contact with the fixing plate 25, extending the insulation performance to the connection point.

[0028] The suspension mechanism includes two connecting seats 15, two insulating flanges 16, two vertical steel pipes 17, and a horizontal steel pipe 18. The connecting seats 15 and the vertical steel pipes 17 are connected by insulating flanges 16. The horizontal steel pipe 18 is fixedly connected between the two vertical steel pipes 17. The connecting seats 15 are connected to the upper side of the top plate 9. The insulating flanges 16 installed between the connecting seats 15 and the vertical steel pipes 17 have insulating gaskets tightly fitted between them. Insulating tubes are also fitted on the bolts of the connecting insulating flanges 16 to block current conduction and prevent stray current from causing electrochemical corrosion to the hanger, ensuring electrical safety. The two vertical steel pipes 17 and the horizontal steel pipe 18 form a stable portal frame structure, ensuring that the short network remains fixed and does not shift under high current conditions. This mechanism is easy to disassemble and maintain, improving equipment installation efficiency and maintenance convenience.

[0029] Both the first copper tube 26 and the second copper tube 27 include a copper tube body 28, a first insulating layer 29, a second insulating layer 30, and a third insulating layer 31 sequentially covering the outside of the copper tube body 28; insulating varnish is applied between the first insulating layer 29 and the copper tube body 28, between the first insulating layer 29 and the second insulating layer 30, between the second insulating layer 30 and the third insulating layer 31, and on the outer wall of the third insulating layer 31; the first insulating layer 29 is composed of two layers of mica tape, the second insulating layer 30 is composed of two layers of fiberglass tape, and the third insulating layer 31 is composed of two layers of white cloth tape. The first copper tube 26 and the second copper tube 27 are sequentially fixed to the copper tube body 28 using a "half-overlap, half-wrap" process, consisting of two layers of mica tape, two layers of fiberglass tape, and two layers of white cloth tape, forming a tight and gapless covering layer. The mica tape has excellent high-temperature resistance, capable of withstanding temperatures above 1000℃, resisting heat radiation during the smelting process in the electric arc furnace; the fiberglass tape provides good mechanical strength, enhancing the tensile and tear resistance of the insulation layer; the white cloth tape acts as a protective buffer, isolating external dust, moisture, and mechanical wear. Insulating varnish is applied between each insulation layer and to the outermost layer to further fill the tiny pores, forming a dense insulation barrier and increasing the insulation resistance.

[0030] The copper tube body 28 is made of TU1 oxygen-free electrolytic copper. Its copper content is as high as 99.97% (Cu+Ag); its thermal conductivity at 20℃ is λ=391W / (m·℃); it has high electrical conductivity, with a conductivity g=101.4%IACS and resistivity ρ=0.0171μΩ·m after annealing at 700℃ for 30 minutes; furthermore, it has extremely low oxygen and impurity content, exhibiting excellent ductility, low permeability, and almost no "hydrogen slag" characteristics; it demonstrates superior performance in processing, welding, corrosion resistance, and cold resistance.

[0031] Multiple hanging clamps 4 are connected to connecting frames 5 on their lower sides, and protective covers 6 are detachably connected to both ends of the multiple connecting frames 5. The combined structure of the protective cover 6 and the hanging clamps 4 is intended to resist the continuous scouring of high-temperature flue gas and the attack of high-intensity heat radiation during the smelting process of the electric arc furnace, and reduce the risk of the outer insulation covering material of the short mesh carbonizing, aging or peeling off due to high temperature.

[0032] Working Process and Principle: When the high-efficiency short grid and short grid tail hanger of this electric arc furnace are in operation, the first copper pipe 26 and the second copper pipe 27 in the two rows of short grid pipe groups 1 are arranged vertically and alternately to form a conductive path. The copper pipe half sleeve of the two rows of short grid pipe groups 1 near the head hanger 2 is connected to the secondary output terminal of the electric arc furnace transformer, and the end near the tail hanger 7 is connected to the vertical copper pipe of the electric arc furnace. The current distribution path of the second copper pipe 27 arranged at different heights near the tail hanger 7 reduces the mutual inductance coefficient, so the short grid voltage drop is smaller and the furnace power is higher, which is conducive to energy saving. During the current transmission process, the L-shaped outer clamp 11 and the Z-shaped inner clamp 12 of the tail hanger 7 are spliced ​​and snapped together by the tenon and mortise structure. The first arc-shaped groove 13 and the second arc-shaped groove 14 inside are tightly fitted to the outer diameter of the first copper pipe 26 and the second copper pipe 27, limiting them within the assembly frame and preventing the first copper pipe 26 and the second copper pipe 27 from being displaced due to the electromagnetic force generated by the large current. The assembly frame is insulated and fixed to the top plate 9 and bottom channel steel 8 through top and bottom insulated connection structures. Components such as insulating pads 22 and insulating pipes 21 prevent current leakage. The insulating flange 16 in the hanging mechanism connects the vertical steel pipe 17 and the connecting seat 15, ensuring the overall insulation of the hanger while suspending the tail hanger 7 from the workshop beam through the horizontal steel pipe 18. The copper pipe body 28, covered with three layers of insulating material and coated with insulating paint, prevents leakage while ensuring conductivity. In addition, the connecting frame 5 below the hanging clamp 4 is combined with the protective cover 6 to prevent the high-temperature flue gas and heat radiation generated by the smelting furnace from burning the short net covering material, thereby improving the service life of the short net.

[0033] This utility model employs a short network tube assembly 1 arranged vertically and with staggered tail heights, changing the traditional 120° bifurcated and horizontally parallel wiring layout. This reduces the inductance of the short network, decreases the phase difference between current and voltage, improves the power factor, and enhances energy utilization efficiency. The tail hanger 7 uses a tenon-and-mortise joint structure of an L-shaped outer clamp 11 and a Z-shaped inner clamp 12. Compared with traditional integrated or butt-jointed clamps, this avoids the cumbersome operation of threading multiple first copper tubes 26 and multiple second copper tubes 27, and can stably clamp the staggered tail heights of the first copper tubes 26 and multiple second copper tubes 27, meeting the fixing requirements under complex working conditions. The above is only a preferred embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-efficiency short mesh for a submerged arc furnace and a short mesh tail hanger, comprising two rows of horizontally arranged short mesh pipe groups (1), a head hanger (2) and a tail hanger (7) respectively located at the head and tail ends of the two rows of short mesh pipe groups (1), and a plurality of shaping clamps (3) and hanging clamps (4) staggered in the middle of the two rows of short mesh pipe groups (1), characterized in that, The short tube assembly (1) is composed of multiple first copper tubes (26) arranged vertically and multiple second copper tubes (27), and the two horizontally spaced second copper tubes (27) near the tail hanger (7) are arranged in a staggered pattern; the tail hanger (7) includes an assembly frame, two vertically spaced L-shaped outer clamps (11), multiple vertically arranged Z-shaped inner clamps (12) between the two outer clamps (11), a first arc-shaped slot (13) opened on the recess of the outer clamp (11), and a second arc-shaped slot opened on the recesses on both sides of the inner clamp (12). The first arc-shaped slot (13) and the second arc-shaped slot (14) are adapted to the outer diameters of the corresponding first copper tube (26) and second copper tube (27); two L-shaped outer clamps (11) and multiple Z-shaped inner clamps (12) are joined together by mortise and tenon structure and tightly fitted into the interior of the assembly frame; one end of multiple first copper tubes (26) and second copper tubes (27) respectively enters the corresponding first arc-shaped slot (13) and second arc-shaped slot (14) and extends to the other side of the assembly frame.

2. The short net and short net tail hanger according to claim 1, characterized in that, The assembly frame includes a top plate (9) and a bottom channel steel (8) arranged from top to bottom, two side channel steels (10) arranged horizontally between the top plate (9) and the bottom channel steel (8), and insulating connection structures respectively located on the top and bottom of the two side channel steels (10); the two insulating connection structures located at the top are connected to the top plate (9), and the two insulating connection structures located at the bottom are connected to the bottom channel steel (8).

3. The short net and short net tail hanger according to claim 2, characterized in that, The insulating connection structure includes a fixing plate (25) located on the outside of the side channel steel (10), an insulating pad (22) tightly attached to one side of the fixing plate (25), a spring washer (23) and a nut (24) stacked on the upper side of the insulating pad (22), a hexagonal bolt (19) threaded with the nut (24), and a flat washer (20) and an insulating tube (21) sleeved on the hexagonal bolt (19); the insulating tube (21) is sandwiched between the flat washer (20) and the fixing plate (25). The insulating connection structure at the bottom is connected to the lower side of the bottom channel steel (8) through the hexagonal bolt (19), and the insulating connection structure at the top is connected to the top plate (9) through the hexagonal bolt (19).

4. The short net and short net tail hanger according to claim 2, characterized in that, The hanging mechanism includes two connecting seats (15), two insulating flanges (16), two vertical steel pipes (17), and a horizontal steel pipe (18); the connecting seats (15) and the vertical steel pipes (17) are connected by insulating flanges (16), the horizontal steel pipe (18) is located between the two vertical steel pipes (17), and the connecting seats (15) are connected to the upper side of the top plate (9).

5. The short net and short net tail hanger according to claim 1, characterized in that, The first copper tube (26) and the second copper tube (27) each include a copper tube body (28), a first insulating layer (29), a second insulating layer (30) and a third insulating layer (31) sequentially covering the outside of the copper tube body (28); the first insulating layer (29) and the copper tube body (28), the first insulating layer (29) and the second insulating layer (30), the second insulating layer (30) and the third insulating layer (31) and the outer wall of the third insulating layer (31) are all coated with insulating paint; the first insulating layer (29) is composed of two layers of mica tape, the second insulating layer (30) is composed of two layers of glass ribbon, and the third insulating layer (31) is composed of two layers of white cloth tape.

6. The short net and short net tail hanger according to claim 5, characterized in that, The copper tube body (28) is made of TU1 oxygen-free electrolytic copper material.

7. The short net and short net tail hanger according to claim 1, characterized in that, Each of the multiple hanging clamps (4) is provided with a connecting frame (5) on its lower side, and the two ends of the multiple connecting frames (5) are connected with protective covers (6).

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