Bottom electrode structure of direct-current electric arc furnace

Abstract

The utility model relates to the technical field of direct-current electric arc furnaces, and discloses a direct-current electric arc furnace bottom electrode structure which comprises a shell and a heat insulation fireproof layer installed in the shell, a magnesium carbon conductive base is arranged on the inner side of the heat insulation fireproof layer, a bottom column is installed at the lower end of the shell, limiting pieces are installed on the two sides of the shell, and a hanging piece is arranged on one side of the shell. And a hanging mechanism is arranged on the outer side of the shell and comprises a fixing block, a cavity is formed in the fixing block, two sets of springs are installed in the cavity, the two sets of springs are symmetrically distributed along the center of the cavity of the fixing block, and a fixing plate is fixedly connected to the upper ends of the springs. When the magnesium-carbon conductive base needs to be replaced in the later period, the adjusting plate is adjusted to the original angle, the shackle is not limited and is pushed upwards to the highest position by the spring, the shackle is hooked by matching with the hanging bracket, the steel rope and the hook, the magnesium-carbon conductive base can be lifted upwards, and the efficiency is more convenient when the magnesium-carbon conductive base is replaced.

Description

Technical Field

[0001] The utility model relates to the field of direct current arc furnaces, in particular to a bottom electrode structure of a direct current arc furnace. Background Art

[0002] A DC arc furnace converts three-phase AC into single-phase DC through thyristor rectification, and generates an arc on the metal charge between the furnace bottom electrode (anode) and the graphite electrode (cathode) for smelting.

[0003] According to my country's patent application number: 202123269547.6; a DC arc furnace bottom electrode structure is provided with a fixing mechanism. After the magnesium-carbon conductive base has been used for a long time, the threaded rod is rotated by turning the knob, and then the fixed block is driven to move away from the first slot. At this time, the magnesium-carbon conductive base can be taken out of the thermal insulation refractory layer, so that a new magnesium-carbon conductive base can be replaced, and there is no need to replace the entire furnace bottom, thereby reducing the replacement cost.

[0004] This solution has the following defects:

[0005] This scheme adopts a detachable base so that the worn magnesium-carbon conductive base can be disassembled and replaced. However, due to the structural limitations of the DC arc furnace and the smooth round surface on the upper end of the magnesium-carbon conductive base, there is no lifting position that can bear force when the magnesium-carbon conductive base is replaced. If it is lifted by clamping, the outer wall of the magnesium-carbon conductive base will be scratched. Therefore, in order to solve the above problems, a DC arc furnace bottom electrode structure is proposed. Utility Model Content

[0006] The purpose of the utility model is to provide a bottom electrode structure of a DC arc furnace to solve the problems raised in the above background technology.

[0007] To achieve the above purpose, the utility model provides the following technical solution: a DC arc furnace bottom electrode structure, comprising:

[0008] An outer shell and a heat-insulating refractory layer installed in the outer shell, a magnesium-carbon conductive base is arranged on the inner side of the heat-insulating refractory layer, and a bottom column is installed at the lower end of the outer shell;

[0009] Limiting members are installed on both sides of the shell, a hanging member is arranged on one side of the shell, and a hanging mechanism is arranged on the outer side of the shell;

[0010] The hanging mechanism includes a fixed block, a cavity is arranged inside the fixed block, and a spring is installed in the cavity. The spring is provided in two groups, and the two groups of springs are symmetrically arranged along the center of the cavity of the fixed block. The upper end of the spring is fixedly connected to a fixed plate, and the upper end of the fixed plate is fixedly connected to a hook ring. The upper end of the fixed block is provided with a cover.

[0011] Preferably, the cover is provided with a movable groove, the movable groove is matched with the hook ring, the bottom of the spring is fixedly connected to the bottom of the inner wall of the fixed block, and the fixed plate is slidably connected to the inner wall of the cavity of the fixed block.

[0012] Preferably, the limit member includes a limit seat, which is connected to the side of the thermal insulation and refractory layer and has a groove inside. The lower end of the limit seat is threadedly connected to a threaded rod, the upper end of the threaded rod is movably connected to a limit block, and an adjustment member is installed at the upper end of the limit block.

[0013] Preferably, the adjusting member comprises an adjusting plate and a connecting block, the connecting block is mounted on the upper end of the limiting block, and the connecting block and the adjusting plate are connected by bolts.

[0014] Preferably, the hanging member comprises a hanger, a steel rope is installed at the front end of the hanger, a hook is fixedly connected to the lower end of the steel rope, and a movable part is arranged at the rear end of the hanger.

[0015] Preferably, the movable part includes a support frame, a plurality of groups of hydraulic cylinders are equidistantly arranged on the upper end of the support frame, the pistons of the hydraulic cylinders are fixedly connected to the lower end of the hanger, a pulley is installed at the lower end of the support frame, and the pulley is slidably connected to the guide rail.

[0016] Technical effects and advantages of the utility model:

[0017] The utility model utilizes fixing blocks installed on both sides of the magnesium-carbon conductive base respectively, and the magnesium-carbon conductive base is installed from top to bottom by using the fixing blocks to align with the limit seats on both sides of the thermal insulation and refractory layer. When the fixing blocks are overlapped at the grooves opened in the limit seats, the worker twists the threaded rod to move the limit blocks downward, and twists the threaded rods to rotate the adjustment plate ninety degrees, so that the adjustment plate and the limit blocks are kept flush. When the limit blocks move downward to the bottom, the adjustment plate moves downward synchronously, and the adjustment plate presses the hook ring into the fixed block, so that the cover plate can be installed above the shell during material processing. When the magnesium-carbon conductive base needs to be replaced later, the adjustment plate is adjusted to the original angle, and the hook ring is not restricted and is pushed upward to the highest point by the spring. The hook ring is hooked with the hanger, steel rope and hook, and the magnesium-carbon conductive base can be used to lift it upward, which is more efficient and convenient when replacing the magnesium-carbon conductive base. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model.

[0019] Figure 2 This is a structural schematic diagram of the utility model in which the hook ring is hung by a hook.

[0020] Figure 3 It is a schematic diagram of the cross-sectional structure of a partial limit seat of the utility model.

[0021] Figure 4 It is a schematic diagram of the explosive splitting structure of the fixed block of the utility model.

[0022] Figure 5 For this utility model Figure 2 Enlarged structural diagram at A in the middle.

[0023] In the figure: 1. outer shell; 2. heat-insulating refractory layer; 3. magnesium-carbon conductive base; 4. limit seat; 5. threaded rod; 6. limit block; 7. adjustment plate; 8. connecting block; 9. groove; 10. fixing block; 11. spring; 12. fixing plate; 13. sealing cover; 14. hook; 15. guide rail; 16. hydraulic cylinder; 17. hanger; 18. steel rope; 19. hook; 20. support frame. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The utility model provides Figure 1-4 A DC arc furnace bottom electrode structure is shown, comprising:

[0026] A shell 1 and a heat-insulating refractory layer 2 installed in the shell 1, a magnesium-carbon conductive base 3 is arranged on the inner side of the heat-insulating refractory layer 2, and a bottom column is installed at the lower end of the shell 1;

[0027] Limiting members are installed on both sides of the shell 1, a hanging member is provided on one side of the shell 1, and a hanging mechanism is provided on the outer side of the shell 1;

[0028] The hanging mechanism includes a fixed block 10, a cavity is provided inside the fixed block 10, and a spring 11 is installed in the cavity. Two groups of springs 11 are provided, and the two groups of springs 11 are symmetrically arranged along the center of the cavity of the fixed block 10. The upper end of the spring 11 is fixedly connected to a fixed plate 12, and the upper end of the fixed plate 12 is fixedly connected to a hook ring 14. The upper end of the fixed block 10 is provided with a cover 13, and the cover 13 is provided with a movable groove, which is adapted to the hook ring 14, and the bottom of the spring 11 is aligned with the bottom of the inner wall of the fixed block 10. Fixed connection, the fixed plate 12 is slidably connected with the inner wall of the cavity of the fixed block 10, the limit member includes a limit seat 4, the limit seat 4 is connected to the side of the thermal insulation and refractory layer 2, and a groove 9 is opened inside the limit seat 4, the lower end of the limit seat 4 is threadedly connected with a threaded rod 5, the upper end of the threaded rod 5 is movably connected to the limit block 6, the upper end of the limit block 6 is installed with an adjusting member, the adjusting member includes an adjusting plate 7 and a connecting block 8, the connecting block 8 is installed at the upper end of the limit block 6, and the connecting block 8 is connected to the adjusting plate 7 by bolts.

[0029] The cavity opened inside the fixed block 10 is used to install the spring 11, and two groups of springs 11 are installed inside each group of fixed blocks 10. The fixed plate 12 is installed at the upper ends of the two groups of springs 11, and the fixed plate 12 is slidably connected to the cavity of the fixed block 10. The spring 11 pushes the fixed plate 12 to move upward to the highest point, and the hook ring 14 plays a more convenient role in lifting the magnesium-carbon conductive base 3 in the later stage. When processing metal materials, the limit block 6 moves downward to the bottom, and the adjustment plate 7 moves downward synchronously, and the adjustment plate 7 presses the hook ring 14 into the fixed block 10. The limit block 6 and the adjustment plate 7 cooperate to limit the hook ring 14 to the inside of the fixed block 10, and at the same time provide positioning for the fixed block 10 to ensure that the magnesium-carbon conductive base 3 can be fixed between the two groups of limit blocks 6. The angle adjustment of the adjustment plate 7 adopts bolt and nut tightness adjustment.

[0030] The hanging parts include a hanger 17, a steel rope 18 is installed at the front end of the hanger 17, a hook 19 is fixedly connected to the lower end of the steel rope 18, a movable part is arranged at the tail end of the hanger 17, and the movable part includes a support frame 20, a plurality of groups of hydraulic cylinders 16 are equidistantly arranged at the upper end of the support frame 20, the pistons of the hydraulic cylinders 16 are fixedly connected to the lower end of the hanger 17, a pulley is installed at the lower end of the support frame 20, and the pulley is slidably connected to the guide rail 15.

[0031] The steel rope 18 installed at the front end of the hanger 17 hooks the hook ring 14 through the cooperation with the hook 19, and the hydraulic cylinder 16 is used to move the hanger 17 upward to lift the magnesium-carbon conductive base 3, so that the magnesium-carbon conductive base 3 is separated from the thermal insulation refractory layer 2. Two groups of hanging parts and movable parts can be set, one group is used to disassemble the magnesium-carbon conductive base 3, and the other group is used to hang the magnesium-carbon conductive base 3 to be used. After the damaged magnesium-carbon conductive base 3 is disassembled, the magnesium-carbon conductive base 3 to be used can be directly installed in the thermal insulation refractory layer 2. At this time, the disassembled magnesium-carbon conductive base 3 can be maintained and repaired separately, and the entire equipment will not stop running due to the maintenance of the magnesium-carbon conductive base 3.

[0032] Working principle of this utility model:

[0033] By installing fixed blocks 10 on both sides of the magnesium-carbon conductive base 3, the magnesium-carbon conductive base 3 is installed from top to bottom by using the fixed blocks 10 to align with the limit seats 4 on both sides of the thermal insulation and refractory layer 2. When the fixed block 10 is overlapped at the groove 9 opened in the limit seat 4, the worker twists the threaded rod 5 to move the limit block 6 downward, and twists the threaded rod 5 to rotate the adjustment plate 7 ninety degrees, so that the adjustment plate 7 and the limit block 6 are kept flush. When the limit block 6 moves downward to the bottom, the adjustment plate 7 moves downward synchronously, and the adjustment plate 7 presses the hook ring 14 into the fixed block 10, so that the cover plate can be installed on the top of the shell 1 during material processing. When the magnesium-carbon conductive base 3 needs to be replaced later, the adjustment plate 7 is adjusted to the original angle, and the hook ring 14 is not restricted and is pushed upward to the highest point by the spring 11. The hook ring 14 is hooked with the hanger 17, the steel rope 18 and the hook 19, and the magnesium-carbon conductive base 3 can be used to lift it up, which is more efficient and convenient when replacing the magnesium-carbon conductive base 3.

[0034] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A DC arc furnace bottom electrode structure, comprising: An outer shell (1) and a heat-insulating refractory layer (2) installed in the outer shell (1), a magnesium-carbon conductive base (3) is arranged on the inner side of the heat-insulating refractory layer (2), and a bottom column is installed at the lower end of the outer shell (1); It is characterized in that both sides of the shell (1) are equipped with limiting members, one side of the shell (1) is provided with a hanging member, and the outer side of the shell (1) is provided with a hanging mechanism; The hanging mechanism comprises a fixed block (10), a cavity is arranged inside the fixed block (10), and a spring (11) is installed in the cavity, two groups of the springs (11) are arranged, and the two groups of the springs (11) are symmetrically arranged along the center of the cavity of the fixed block (10), the upper end of the spring (11) is fixedly connected to a fixed plate (12), the upper end of the fixed plate (12) is fixedly connected to a hook ring (14), and the upper end of the fixed block (10) is provided with a cover (13).

2. A DC arc furnace bottom electrode structure according to claim 1, characterized in that: The cover (13) is provided with a movable groove, which is matched with the hook ring (14); the bottom of the spring (11) is fixedly connected to the bottom of the inner wall of the fixed block (10); and the fixed plate (12) is slidably connected to the inner wall of the cavity of the fixed block (10).

3. A DC arc furnace bottom electrode structure according to claim 2, characterized in that: The limiting member comprises a limiting seat (4), the limiting seat (4) is connected to the side of the heat-insulating fire-resistant layer (2), and a groove (9) is provided inside the limiting seat (4), the lower end of the limiting seat (4) is threadedly connected to a threaded rod (5), the upper end of the threaded rod (5) is movably connected to a limiting block (6), and the upper end of the limiting block (6) is installed with an adjusting member.

4. A DC arc furnace bottom electrode structure according to claim 3, characterized in that: The adjusting member comprises an adjusting plate (7) and a connecting block (8); the connecting block (8) is mounted on the upper end of the limiting block (6), and the connecting block (8) and the adjusting plate (7) are connected by bolts.

5. A DC arc furnace bottom electrode structure according to claim 4, characterized in that: The hanging component comprises a hanger (17), a steel rope (18) is installed at the front end of the hanger (17), a hook (19) is fixedly connected to the lower end of the steel rope (18), and a movable part is arranged at the rear end of the hanger (17).

6. A DC arc furnace bottom electrode structure according to claim 5, characterized in that: The movable part comprises a support frame (20), a plurality of groups of hydraulic cylinders (16) are equidistantly arranged on the upper end of the support frame (20), the pistons of the hydraulic cylinders (16) are fixedly connected to the lower end of the hanger (17), and a pulley is installed at the lower end of the support frame (20), and the pulley is slidably connected to the guide rail (15).

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