Graphite electrode for electric arc furnace capable of being pretreated

Abstract

The graphite electrode comprises a graphite electrode body for the electric arc furnace, a multifunctional pretreatment protection mechanism is arranged in the graphite electrode body for the electric arc furnace, and an auxiliary mounting mechanism is arranged at the top of the graphite electrode body for the electric arc furnace; according to the graphite electrode for the electric arc furnace, a multifunctional pretreatment protection mechanism formed by sequentially stacking a substrate bonding layer, a micropore permeation layer, a reinforced oxygen barrier layer, a slow release protection layer, a surface compact sealing layer and an external self-repairing protection layer is arranged in a graphite electrode body for the electric arc furnace; the graphite electrode body for the electric arc furnace can be subjected to efficient oxygen-isolating slow-release protection, and the high-purity substrate bonding layer ensures that the electrode has excellent conductivity and high-temperature resistance; the micropore permeation layer and the micropore permeation layer improve the bonding firmness and permeation binding property of the inner layer and the outer layer, and the oxidation process is effectively delayed through multiple overlapped arrangement of the reinforced oxygen barrier layer and the slow-release protection layer.

Description

Technical Field

[0001] The present invention relates to the technical field of graphite electrodes, in particular to a graphite electrode for an electric arc furnace that can be pretreated. Background Art

[0002] Graphite electrodes are high-temperature conductive materials made from carbon materials such as petroleum coke and needle coke as the main raw materials, through multiple processes such as calcination, batching, kneading, molding, roasting, graphitization and mechanical processing. They are widely used in industrial high-temperature heating or smelting equipment such as electric arc furnace steelmaking, submerged arc furnace, and electric slag furnace. As an important conductor for releasing arc heat energy and current input terminal, graphite electrodes have excellent conductivity, high temperature resistance, small thermal expansion coefficient and good chemical stability. They can work stably under extremely high temperature conditions and withstand severe thermal and mechanical shocks during the smelting process. They are one of the indispensable key consumables for modern electric furnace steelmaking.

[0003] In the actual implementation process, there are still some problems:

[0004] 1. Currently, graphite electrodes are commonly used as conductive heating elements in the electric arc furnace smelting production process. Graphite electrodes have good electrical conductivity and high-temperature resistance. However, under high-temperature oxidizing atmospheres and high-load mechanical action, the electrode surface is prone to oxidation, burning, and structural peeling, resulting in shortened electrode life, increased maintenance costs, and frequent shutdowns. In addition, existing graphite electrodes are mostly protected by a single coating or surface spraying method. The coating is easily peeled off by heat, and the protective effect is limited. In addition, impurities such as slag and dust attached to the surface are difficult to clean, further exacerbating the corrosion and wear of the electrode.

[0005] 2. In terms of electrode installation, existing arc furnace electrodes usually rely on manual or empirical judgment for connection and tightening. If they are not installed properly, they are prone to loosening, poor contact, or even falling off during high-temperature operations, posing a major safety hazard. In addition, repeated manual inspections occupy manpower and are inefficient. Summary of the Invention

[0006] (1) Technical issues to be resolved

[0007] In order to solve the above problems in the prior art, the present invention provides a graphite electrode for an electric arc furnace that can be pretreated, which solves the problems that the existing graphite electrodes are easily oxidized and worn and cannot be installed securely.

[0008] (2) Technical solution

[0009] In order to achieve the above object, the main technical solutions adopted by the present invention are:

[0010] A graphite electrode for an electric arc furnace that can be pretreated comprises a graphite electrode body for the electric arc furnace, a multifunctional pretreatment protection mechanism is provided inside the graphite electrode body for the electric arc furnace, and an auxiliary installation mechanism is provided on the top of the graphite electrode body for the electric arc furnace;

[0011] The multifunctional pretreatment protection mechanism includes, from the inside to the outside, a base bonding layer, a microporous permeation layer, an enhanced oxygen barrier layer, a slow-release protective layer, a surface sealing layer, and an external self-repairing protective layer. The base bonding layer is fixedly connected to the graphite electrode body for an electric arc furnace by a high-temperature refractory adhesive, and the microporous permeation layer is fixedly connected to the base bonding layer by a permeable curing agent.

[0012] The auxiliary installation mechanism includes a transmission block, an extrusion rod and a reminder plate, one end of the extrusion rod is fixedly connected to the inner side of the reminder plate, the inner side of the transmission block is fitted to one end of the extrusion rod, and a mounting seat is provided on the outside of the transmission block.

[0013] An inner hole is formed in the graphite electrode body for an electric arc furnace, and a connecting joint is connected to the top end of the graphite electrode body for an electric arc furnace.

[0014] The mounting seat is fixedly sleeved on the middle part of the connecting joint, and the top end of the mounting seat is fixedly connected with a mounting plate.

[0015] A trigger rod is vertically slidably connected to the middle of the mounting plate, and the bottom end of the trigger rod is fixedly connected to the top end of the transmission block.

[0016] A mounting groove is provided inside the mounting seat, an inner wall of the mounting groove is fixedly connected to a limit plate, and the transmission block is vertically slidably connected to the limit plate.

[0017] A sliding groove is provided on the outer side of the mounting seat, and the extrusion rod is slidably connected to the inner wall of the sliding groove.

[0018] The bottom end of the extrusion rod is fixedly connected to a fixing plate, one side of the inner wall of the installation groove is fixedly connected to a return spring rod, and one end of the return spring rod is fixedly connected to the inner side of the fixing plate.

[0019] The enhanced oxygen barrier layer is fixedly connected to the microporous permeation layer through a high-temperature fire-resistant adhesive, and the slow-release protective layer is fixedly connected to the enhanced oxygen barrier layer through a high-temperature fire-resistant adhesive.

[0020] The surface-tightening sealing layer is fixedly connected to the slow-release protective layer by means of an adhesive, and the external self-repairing protective layer is fixedly connected to the surface-tightening sealing layer by means of a low-temperature curing adhesive.

[0021] The base bonding layer is made of high-purity graphite material, the microporous permeation layer is made of high-temperature resistant organic resin, the slow-release protective layer is made of aluminum oxide material, the surface sealing layer is made of nickel alloy, the enhanced oxygen barrier layer is composed of rare earth oxide, and the external self-repairing protective layer is made of fluoride.

[0022] (3) Beneficial effects

[0023] The beneficial effects of the present invention are:

[0024] 1. In the present invention, a multifunctional pretreatment protection mechanism composed of a substrate bonding layer, a microporous permeation layer, a reinforced oxygen barrier layer, a slow-release protective layer, a surface sealing layer and an external self-repairing protective layer stacked in sequence is provided inside the graphite electrode body for an electric arc furnace, which can play a highly efficient oxygen-isolating and slow-release protective role for the graphite electrode body for an electric arc furnace, wherein the high-purity substrate bonding layer ensures that the electrode itself has excellent electrical conductivity and high-temperature resistance; the microporous permeation and the microporous permeation layer improve the bonding firmness and permeability of the inner and outer layers, and the multiple stacking of the reinforced oxygen barrier layer and the slow-release protective layer effectively delays the oxidation process; the surface sealing layer and the external self-repairing protective layer further enhance the density and corrosion resistance of the outer surface of the electrode, and at the same time have a self-cleaning function, which can reduce the accumulation of attachments and reduce the subsequent maintenance cost. Through the cooperation of the multi-layer gradient structure, excellent high-temperature resistance, oxidation resistance and self-repairing ability are achieved, which significantly extends the service life of the electrode in high-temperature operation of the electric arc furnace.

[0025] 2. In the present invention, an auxiliary installation mechanism is added to the top of the graphite electrode body for electric arc furnaces, and the interaction between the connecting joint and the external accessories during the installation process is cleverly utilized. When the electrode is installed in place, the internal trigger rod is squeezed by the connecting joint, and the trigger rod drives the transmission block to move vertically downward. The inclined structure of the transmission block drives the extrusion rod to achieve translation, and then pushes the reminder plate to pop out from the slide slot, providing visual prompts to the installers in time, and effectively preventing hidden dangers such as improper installation, loosening or falling off. The auxiliary installation mechanism has a simple structure, sensitive response, and reliable reset, which can ensure that the graphite electrode body for electric arc furnaces is firmly and stably installed in a high-temperature and heavy-load environment, while significantly improving the safety and reliability of assembly, reducing labor inspection costs, and has strong practicality and broad promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the bottom part of the present invention;

[0028] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0029] Figure 4 It is a structural schematic diagram of the mounting seat portion of the present invention;

[0030] Figure 5 For the present invention Figure 4 Enlarged view of point B in the middle.

[0031] [Description of Reference Numerals]

[0032] 1. Graphite electrode body for electric arc furnace; 2. Connecting joint; 3. Auxiliary installation mechanism; 301. Mounting seat; 302. Mounting plate; 303. Mounting groove; 304. Slide groove; 305. Trigger rod; 306. Reminder plate; 307. Reset spring rod; 308. Limit plate; 309. Extrusion rod; 310. Transmission block; 311. Fixed plate; 4. Multifunctional pretreatment protection mechanism; 401. Base bonding layer; 402. Microporous permeation layer; 403. Enhanced oxygen barrier layer; 404. Slow-release protective layer; 405. Surface sealing layer; 406. External self-repairing protective layer; 5. Inner hole. DETAILED DESCRIPTION

[0033] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0034] Please refer to Figures 1 to 5 As shown, a graphite electrode for an electric arc furnace that can be pretreated according to the present invention comprises a graphite electrode body 1 for an electric arc furnace, a multifunctional pretreatment protection mechanism 4 is provided inside the graphite electrode body 1 for an electric arc furnace, and an auxiliary installation mechanism 3 is provided on the top of the graphite electrode body 1 for an electric arc furnace;

[0035] The multifunctional pretreatment protection mechanism 4 includes, from the inside to the outside, a base bonding layer 401, a microporous permeable layer 402, a reinforced oxygen barrier layer 403, a slow-release protective layer 404, a surface sealing layer 405, and an external self-repairing protective layer 406. The base bonding layer 401 is fixedly connected to the graphite electrode body 1 for an electric arc furnace by a high-temperature refractory adhesive, and the microporous permeable layer 402 is fixedly connected to the base bonding layer 401 by a permeable curing agent.

[0036] The auxiliary installation mechanism 3 includes a transmission block 310, an extrusion rod 309 and a reminder plate 306. One end of the extrusion rod 309 is fixedly connected to the inner side of the reminder plate 306. The inner side of the transmission block 310 is attached to one end of the extrusion rod 309. A mounting seat 301 is provided on the outside of the transmission block 310. In the actual implementation process, the graphite electrode body 1 for electric arc furnaces that can be pretreated provided by the present invention is first precisely processed according to the required electrode size and then evenly laid inside the electrode body. The multifunctional pretreatment protection mechanism 4 sequentially stacks the base bonding layer 401, the microporous permeation layer 402, the enhanced oxygen barrier layer 403, the slow-release protection layer 404, the surface sealing layer 405 and the external self-repairing protection layer 406 from the inside to the outside. The layers are fixedly connected with a high-temperature refractory adhesive or a permeable curing agent to ensure tight and seamless bonding between the layers. The multi-layer functional structure can effectively block oxygen intrusion and delay high-temperature oxidation, and has self-cleaning and self-repairing effects, which significantly improves the service life of the electrode in high-temperature operation of the electric arc furnace. The auxiliary installation mechanism 3 installed on the top of the electrode is connected to the external accessories through the connecting joint 2 during installation, and mechanical linkage is used to realize installation status reminder to avoid loosening and falling off, thereby improving safety and reliability of use.

[0037] Optionally, an inner hole 5 is formed inside the graphite electrode body 1 for an electric arc furnace, and a connection joint 2 is connected to the top end of the graphite electrode body 1 for an electric arc furnace. In actual implementation, in order to enhance the versatility of the graphite electrode body 1 for an electric arc furnace and its compatibility with different furnace structures, the electrode body can be precisely machined inside the electrode body. The inner hole 5 is precisely machined using numerically controlled equipment to ensure its dimensional accuracy and concentricity. The arrangement of the inner hole 5 facilitates the installation of auxiliary pipelines or temperature sensing elements to achieve real-time monitoring of the electrode status.

[0038] Optionally, the mounting seat 301 is fixedly sleeved on the middle part of the connecting joint 2, and the top of the mounting seat 301 is fixedly connected with the mounting plate 302. In actual implementation, in order to achieve stable cooperation between the auxiliary mounting mechanism 3 and the connecting joint 2, the mounting seat 301 can be sleeved on the middle part of the connecting joint 2. The mounting seat 301 is made of high-strength metal material to ensure high temperature resistance and wear resistance. The shape of the mounting seat 301 matches the size of the joint and can be quickly sleeved on the top of the mounting seat 301 and fixedly connected to the mounting plate 302. The mounting plate 302 is fixed to the top of the mounting seat 301 by welding or screw fastening. The mounting plate 302 serves as the bearing surface of the transmission mechanism and provides a smooth sliding guide for the trigger rod 305 when the electrode is installed in place, ensuring the accuracy of the triggering action. This structure makes the auxiliary mounting mechanism 3 more compact and convenient to install as a whole, avoids displacement caused by external force or high temperature, and improves the stability and reliability of the connection of the graphite electrode body 1 for electric arc furnaces.

[0039] Optionally, a trigger rod 305 is vertically slidably connected to the middle of the mounting plate 302, and the bottom end of the trigger rod 305 is fixedly connected to the top of the transmission block 310. In actual implementation, in order to realize the automatic prompt function of the installation status, a trigger rod 305 with a vertical sliding connection is set in the middle of the mounting plate 302. The trigger rod 305 is fixedly connected to the top of the transmission block 310. The trigger rod 305 is made of high-temperature resistant stainless steel and slides up and down through the guide hole of the mounting plate 302. When the electrode connection connector 2 is fully docked with the external accessory, the trigger rod 305 is squeezed and moves vertically downward to drive the transmission block 310. At the same time, the downward transmission block 310 is designed with an inclined surface. During the movement, it drives the lower squeezing rod 309, which moves horizontally along the slide groove 304 and finally triggers the reminder plate 306 to pop up to prompt that the installation is in place, avoiding manual judgment errors. The structure is simple and sensitive, and reset is convenient, which significantly improves the accuracy and safety of the installation operation.

[0040] Optionally, a mounting slot 303 is provided inside the mounting base 301, and a limit plate 308 is fixedly connected to the inner wall of the mounting slot 303, and the transmission block 310 is vertically slidably connected to the limit plate 308. In actual implementation, the mounting slot 303 is provided inside the mounting base 301. The mounting slot 303 is processed by CNC milling to ensure dimensional consistency and surface smoothness. The inner wall of the mounting slot 303 is fixedly connected to the limit plate 308, which is made of wear-resistant alloy material and fixed to the inner wall of the slot by screws or welding. The limit plate 308 is used to guide and limit the vertical movement of the transmission block 310, preventing the transmission block 310 from deflecting or getting stuck when subjected to force, ensuring that the transmission block 310 always moves along the correct trajectory, thereby ensuring the accurate movement of the subsequent extrusion rod 309 and the reminder plate 306. The combination of the mounting slot 303 and the limit plate 308 not only enhances the movement stability of the transmission components, but also improves the reliability and life of the overall structure.

[0041] Optionally, a slot 304 is provided on the outside of the mounting base 301, and an extrusion rod 309 is slidably connected to the inner wall of the slot 304. In actual implementation, the slot 304 is provided horizontally on the outside of the mounting base 301. The interior of the slot 304 is smooth and burr-free to reduce frictional resistance. The extrusion rod 309 is made of high-temperature resistant alloy steel and precisely matches the size of the slot 304. The extrusion rod 309 is slidably connected to the inner wall of the slot 304 and can achieve smooth translational motion along the slot 304 under the extrusion action of the inclined surface of the transmission block 310. When the extrusion rod 309 is pushed to the predetermined position, the fixedly connected reminder plate 306 pops out, completing the installation status prompt.

[0042] Optionally, the bottom end of the extrusion rod 309 is fixedly connected to a fixing plate 311, and a return spring rod 307 is fixedly connected to one side of the inner wall of the installation groove 303, and one end of the return spring rod 307 is fixedly connected to the inner side of the fixing plate 311. In actual implementation, the bottom end of the extrusion rod 309 is fixed to the fixing plate 311 by welding or bolting. The fixing plate 311 is flush with the end surface of the extrusion rod 309 to ensure force is evenly applied, and a return spring rod 307 is fixedly connected to one side of the inner wall of the installation groove 303. One end of the return spring rod 307 is tightly connected to the inner side of the fixing plate 311, and the other end is fixed to the wall of the installation groove 303. The return rod is made of high-temperature resistant spring steel. When the extrusion rod 309 is pushed by the transmission block 310, the spring is compressed to store energy. When the external force disappears, the spring automatically releases the elastic force to return the extrusion rod 309 to its initial position, ensuring that the reminder plate 306 can automatically return to its original position after the operation is completed. This structure ensures that the auxiliary installation mechanism 3 can be reused multiple times.

[0043] Optionally, the enhanced oxygen barrier layer 403 is fixedly connected to the microporous permeation layer 402 via a high-temperature refractory adhesive, and the slow-release protective layer 404 is fixedly connected to the enhanced oxygen barrier layer 403 via a high-temperature refractory adhesive. In actual implementation, in order to further improve the oxygen barrier performance and service life of the protective layer, the enhanced oxygen barrier layer 403 is firmly connected to the microporous permeation layer 402 via a high-temperature refractory adhesive, and the slow-release protective layer 404 is fixed to the enhanced oxygen barrier layer 403 via a similar adhesive to form a continuous oxygen barrier structure with multiple layers stacked to effectively block the inward penetration of oxygen. At the same time, the active ingredients in the slow-release protective layer 404 are gradually released under high temperature conditions to form a secondary protective film to further reduce the oxidation rate of the graphite matrix. The two layers are fixedly connected by a high-temperature refractory adhesive to ensure high interlayer bonding strength and not easy to peel off when heated. The entire structure has excellent high-temperature resistance and corrosion resistance, greatly extending the service life of the electrode.

[0044] Optionally, the surface induced sealing layer 405 is fixedly connected to the slow-release protective layer 404 by means of an adhesive, and the external self-repairing protective layer 406 is fixedly connected to the surface induced sealing layer 405 by means of a low-temperature curing adhesive. In actual implementation, the surface induced sealing layer 405 is tightly bonded to the slow-release protective layer 404 by means of a high-temperature or room-temperature adhesive. The external self-repairing protective layer 406 is firmly bonded to the surface induced sealing layer 405 by means of a low-temperature curing adhesive. The entire multi-layer structure is stacked layer by layer with smooth transitions between each layer to form a multi-layer oxygen-isolating slow-release protection system. During use, if the outer layer peels off due to mechanical impact or high temperature, the microcapsule material in the self-repairing layer can automatically release to fill the microcracks and maintain overall sealing. The induced sealing layer improves the surface hardness and corrosion resistance, further reducing slag adhesion and oxidation rate. The entire structure ensures long-term stable operation of the electrode.

[0045] Optionally, the base bonding layer 401 is made of high-purity graphite material, the microporous permeation layer 402 is made of high-temperature resistant organic resin, the slow-release protective layer 404 is made of aluminum oxide material, the surface sealing layer 405 is made of nickel alloy, and the enhanced oxygen barrier layer 403 is made of rare earth oxide;

[0046] The external self-repairing protective layer 406 is made of fluoride. In actual implementation, the base bonding layer 401 is made of high-purity graphite material through isostatic pressing or compression molding to ensure density and conductivity. The microporous penetration uses a high-temperature resistant organic resin to form adhesion on the graphite surface. The base slow-release protective layer 404 is sprayed or sintered on the surface of the bonding layer using aluminum oxide to effectively insulate the surface. The sealing layer 405 is thermally sprayed with nickel alloy to increase the mechanical strength of the surface. The oxygen barrier layer 403 is vacuum-sprayed with rare earth oxide to form an oxygen barrier on the surface. The self-repairing protective layer 406 is covered by fluoride through plasma spraying, which has hydrophobic and dust-proof properties. The multiple layers of materials are sequentially constructed to form a highly efficient protection system to extend the service life of the electrode.

[0047] To further verify the protective performance, high-temperature resistance, and service life improvement effects of the multifunctional pretreatment protection mechanism of the arc furnace graphite electrode that can be pretreated in a high-temperature oxidizing environment, we conducted a systematic comparative experiment on the functional layers stacked sequentially from the inside to the outside of the electrode. We selected typical performance indicators such as bonding strength, permeability, oxidation rate, sustained release duration, surface density, and self-repair efficiency, and conducted comparative tests with traditional graphite electrodes without a multifunctional pretreatment protection mechanism. The specific experimental data are shown in Table 1.

[0048] Table 1:

[0049]

[0050]

[0051] As can be seen from Table 1, the multifunctional pretreatment protection mechanism of the present invention sequentially arranges a base bonding layer, a microporous permeation layer, an enhanced oxygen barrier layer, a slow-release protective layer, a surface sealing layer and an external self-repairing protective layer on the surface of the graphite electrode body from the inside to the outside. The functional layers cooperate with each other, which can significantly improve the oxidation resistance and corrosion resistance of the electrode in the high-temperature arc furnace operating environment, reduce the surface oxidation rate, and effectively delay the loss and peeling of the electrode. The self-repairing layer can quickly fill microcracks when the surface is damaged, maintain structural density and self-cleaning performance. The experimental results fully verify that the technical solution of the present invention can effectively extend the service life of graphite electrodes for arc furnaces, reduce maintenance costs and replacement frequency, and has significant economic benefits and practical promotion value.

[0052] 1. Function

[0053] This experimental table systematically evaluates the key performance indicators of each functional layer in the multifunctional pretreatment protection mechanism, including bonding strength, permeability, oxygen barrier capacity, sustained-release protection time, surface density and self-healing ability, to ensure that each layer can work together effectively to build a high-efficiency oxygen isolation and sustained-release protection system, protect the graphite electrode from high-temperature oxidation and mechanical damage, and improve the electrode service life and operational stability.

[0054] 2. Effect

[0055] By comparing experimental data, the protective layer designed in the present invention is significantly superior to the traditional graphite electrode without added layers in terms of bonding strength, oxidation rate, sustained release time and self-repair efficiency, indicating that the multilayer structure can effectively block oxygen and corrosive media, alleviate high-temperature oxidation damage, and at the same time, the self-repair layer can quickly repair surface microcracks, maintain structural integrity and cleanliness, and greatly improve the overall protection performance and reliability of the electrode.

[0056] 3. Novelty

[0057] The present invention achieves a close bond between the protective layers through high-temperature refractory adhesives and permeable curing agents, and innovatively adopts a multi-layer gradient structure, including multiple superpositions of enhanced oxygen barrier layers and slow-release protective layers, as well as the combination of external self-repairing protective layers, to achieve a multifunctional collaborative protection mechanism, which not only improves high-temperature resistance, but also integrates self-cleaning and self-repairing functions, which is different from traditional single coating technology and significantly enhances the protection effect.

[0058] 4. Uniqueness

[0059] This protective structure uniquely combines a metal reinforcement layer with high mechanical strength, a ceramic layer with significant thermal insulation effect, and a protective layer containing rare earth oxides. The adhesive selection between layers is optimized to take into account both high temperature resistance and material bonding strength. At the same time, the outer layer adopts a fluoride self-cleaning coating, which realizes the organic combination of material function and structural performance, and has the significant advantages of self-repair and extended service life.

[0060] Working principle: By arranging a multifunctional pretreatment protection mechanism 4 inside the graphite electrode body 1 for electric arc furnace and an auxiliary installation mechanism 3 on the top, effective protection of the electrode and installation prompt in a high-temperature working environment are achieved. The multifunctional pretreatment protection mechanism 4 includes, from the inside to the outside: a base bonding layer 401 made of high-purity graphite material, used to provide conductivity and high-temperature resistance; microporous penetration made of high-temperature resistant organic resin, which enhances the bonding strength of the inner and outer layers; a slow-release protective layer 404 made of aluminum oxide, which improves the thermal insulation effect and reduces the heat loss of the electrode; a surface sealing layer 405 made of nickel alloy, which enhances the structural strength of the outer surface of the electrode and resists mechanical impact; a reinforced oxygen barrier layer 403 composed of rare earth oxides, which is used to isolate the external oxidizing atmosphere and delay the oxidation of the graphite matrix; an external self-repairing protective layer 406 composed of fluoride, which has hydrophobic and self-repairing properties, effectively reduces the residual attachments, and facilitates subsequent cleaning and pretreatment. At the same time, the auxiliary When the locking cam 305 is in the unlocked position, the locking cam 306 is in the unlocked position, and the locking cam 306 is locked, so that the locking cam 306 is locked.

[0061] The above shows and describes the basic principles, main features and advantages of the present invention, and the standard parts used in the present invention can be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0062] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A graphite electrode for an electric arc furnace that can be pretreated, comprising a graphite electrode body for an electric arc furnace (1), characterized in that: A multifunctional pretreatment protection mechanism (4) is provided inside the graphite electrode body (1) for an electric arc furnace, and an auxiliary installation mechanism (3) is provided on the top of the graphite electrode body (1) for an electric arc furnace; The multifunctional pretreatment protection mechanism (4) comprises, from the inside to the outside, a base bonding layer (401), a microporous permeation layer (402), a reinforced oxygen barrier layer (403), a slow-release protection layer (404), a surface sealing layer (405), and an external self-repairing protection layer (406); the base bonding layer (401) is fixedly connected to the graphite electrode body (1) for an electric arc furnace via a high-temperature refractory adhesive; and the microporous permeation layer (402) is fixedly connected to the base bonding layer (401) via a permeable curing agent; The auxiliary mounting mechanism (3) comprises a transmission block (310), an extrusion rod (309) and a reminder plate (306); one end of the extrusion rod (309) is fixedly connected to the inner side of the reminder plate (306); the inner side of the transmission block (310) is fitted to one end of the extrusion rod (309); and a mounting seat (301) is provided on the outside of the transmission block (310).

2. The graphite electrode for an electric arc furnace that can be pretreated according to claim 1, characterized in that: An inner hole (5) is provided inside the graphite electrode body (1) for an electric arc furnace, and a connecting joint (2) is connected to the top end of the graphite electrode body (1) for an electric arc furnace.

3. The graphite electrode for an electric arc furnace that can be pretreated according to claim 2, characterized in that: The mounting seat (301) is fixedly sleeved on the middle part of the connecting joint (2), and the top end of the mounting seat (301) is fixedly connected to a mounting plate (302).

4. The graphite electrode for an electric arc furnace that can be pretreated according to claim 3, characterized in that: A trigger rod (305) is vertically slidably connected to the middle of the mounting plate (302), and the bottom end of the trigger rod (305) is fixedly connected to the top end of the transmission block (310).

5. The graphite electrode for an electric arc furnace that can be pretreated according to claim 4, characterized in that: A mounting groove (303) is provided inside the mounting seat (301), an inner wall of the mounting groove (303) is fixedly connected to a limit plate (308), and the transmission block (310) is vertically slidably connected to the limit plate (308).

6. The graphite electrode for an electric arc furnace that can be pretreated according to claim 5, characterized in that: A sliding groove (304) is provided on the outer side of the mounting seat (301), and the extrusion rod (309) is slidably connected to the inner wall of the sliding groove (304).

7. The graphite electrode for an electric arc furnace that can be pretreated according to claim 6, characterized in that: The bottom end of the extrusion rod (309) is fixedly connected to a fixing plate (311), one side of the inner wall of the installation groove (303) is fixedly connected to a return spring rod (307), and one end of the return spring rod (307) is fixedly connected to the inner side of the fixing plate (311).

8. The graphite electrode for an electric arc furnace that can be pretreated according to claim 7, characterized in that: The enhanced oxygen barrier layer (403) is fixedly connected to the microporous permeation layer (402) via a high-temperature fire-resistant adhesive, and the slow-release protective layer (404) is fixedly connected to the enhanced oxygen barrier layer (403) via a high-temperature fire-resistant adhesive.

9. The graphite electrode for an electric arc furnace that can be pretreated according to claim 8, characterized in that: The surface-tightening sealing layer (405) is fixedly connected to the slow-release protective layer (404) by means of an adhesive, and the external self-repairing protective layer (406) is fixedly connected to the surface-tightening sealing layer (405) by means of a low-temperature curing adhesive.

10. The graphite electrode for an electric arc furnace that can be pretreated according to claim 1, characterized in that: The substrate bonding layer (401) is made of high-purity graphite material, the microporous permeation layer (402) is made of high-temperature resistant organic resin, the slow-release protective layer (404) is made of aluminum oxide material, the surface sealing layer (405) is made of nickel alloy, the enhanced oxygen barrier layer (403) is composed of rare earth oxide, and the external self-repairing protective layer (406) is made of fluoride.

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