An ultra-high power electric furnace cover sealing device and installation method

Abstract

The present application relates to the technical fields of metallurgical equipment, and discloses a sealing device for a super-high power electric furnace cover and a mounting method. The device comprises a cover body and a furnace flange, and a composite sealing mechanism and a guiding alignment mechanism are arranged at the joint position of the cover body and the furnace flange. A precision adjustment mechanism is arranged around the outer edge of the cover body. The guiding alignment mechanism comprises guiding protrusions and limiting grooves. The guiding protrusions are discontinuously distributed along the circumferential direction of the cover body. The limiting grooves are provided on the furnace flange. The guiding protrusions are inserted into the limiting grooves. A heat expansion compensation gap is reserved between the side wall of the guiding protrusion and the inner wall of the limiting groove. A positioning pin is arranged on the limiting groove. A positioning pin hole matched with the positioning pin is provided at the bottom of the guiding protrusion. The present application realizes accurate assembly of the cover body by means of the guiding structure. The reserved gap is suitable for high-temperature deformation. The disadvantages of manual alignment and misalignment are avoided. The sealing and joint effect is stable.

Description

Technical Field

[0001] This invention relates to the field of metallurgical equipment technology, and in particular to a sealing device and installation method for an ultra-high power electric furnace cover. Background Technology

[0002] Ultra-high power electric arc furnaces operate under harsh conditions, constantly subjected to high-temperature radiation, high-frequency vibration, and metal thermal deformation. The sealing performance of the furnace cover and furnace body flanges directly affects the equipment's thermal energy utilization rate and flue gas sealing effect, which is crucial for the efficient and stable production of the electric arc furnace. Traditional furnace cover sealing structures are simple and crudely assembled, relying on a single layer of sealing gaskets to achieve a seal.

[0003] The existing technology has two major defects. First, it lacks a guiding alignment structure, resulting in low accuracy of manual alignment and easy misalignment of the furnace cover, causing uneven stress on the sealing gasket. Second, it lacks a precision clamping structure, making it impossible to quantify the clamping force. Manual adjustment can easily lead to uneven stress at various points, resulting in gasket damage or air leakage, and poor sealing stability and durability. Summary of the Invention

[0004] To overcome the above shortcomings, the present invention provides a sealing device and installation method for an ultra-high power electric furnace cover, which aims to improve the problems of poor manual alignment accuracy and inability to quantify and control the clamping force of existing furnace covers.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a furnace cover sealing device for an ultra-high power electric furnace, comprising a furnace cover body and a furnace body flange; the mating surfaces of the furnace cover body and the furnace body flange are provided with a composite sealing mechanism and a guiding alignment mechanism; and precision adjustment mechanisms are evenly distributed along the edges of the furnace cover body.

[0006] The guiding alignment mechanism includes guide ribs and limiting grooves; the guide ribs are intermittently distributed along the circumference of the furnace cover body, the limiting grooves are opened on the furnace body flange, the guide ribs are inserted into the limiting grooves, a thermal expansion compensation gap is reserved between the side wall of the guide ribs and the inner wall of the limiting grooves, a positioning pin is provided on the limiting grooves, and a positioning pin hole matching the positioning pin is opened at the bottom of the guide ribs.

[0007] Preferably, the composite sealing mechanism is composed of a high-temperature resistant ceramic fiber layer, a metal corrugated layer and a graphite sealing layer stacked from bottom to top.

[0008] Preferably, the metal corrugated layer is an annular corrugated tube structure, and an elastic support is provided between the crests and troughs of the corrugated tube.

[0009] Preferably, the precision adjustment mechanism includes an adjustment bolt and a pressure sensor; the edge of the furnace cover body is integrally provided with a mounting ear, and the furnace flange is provided with a threaded hole that matches the adjustment bolt. The adjustment bolt passes through the mounting ear and is threadedly connected to the threaded hole of the furnace flange. The pressure sensor is clamped between the head of the adjustment bolt and the mounting ear.

[0010] Preferably, the furnace cover body has a water cooling channel inside.

[0011] Preferably, the top of the furnace cover body is provided with a water inlet and a water outlet, and the water cooling channel is connected to the water inlet and the water outlet.

[0012] A method for installing a sealing device for an ultra-high power electric furnace cover includes the following steps:

[0013] S1 benchmark inspection: Clean the upper surface of the furnace flange, measure the flatness of the furnace flange and record the position of the highest point;

[0014] S2 sealing mechanism installation: A high-temperature resistant ceramic fiber layer, a metal corrugated layer, and a graphite sealing layer are laid sequentially on the furnace flange to assemble the composite sealing mechanism. Elastic support components are pre-assembled inside the metal corrugated layer, and high-temperature sealant is applied between each layer.

[0015] S3 Positioning and Closing: Hoist the furnace cover body, align the guide rib with the limiting groove and lower it vertically. Insert the positioning pin at the limiting groove into the positioning pin hole at the bottom of the guide rib. Leave a thermal expansion compensation gap between the guide rib and the inner wall of the limiting groove to complete the alignment of the furnace cover body and the furnace flange.

[0016] S4 Pressure Control: Tighten the adjusting bolts of the precision adjustment mechanism one by one. The adjusting bolts are screwed down along the threaded hole, and the bolt head is directly pressed against the pressure sensor. The pressure sensor monitors the sealing and clamping load in real time. Tighten each adjusting bolt continuously. When the pressure sensor collects the pressure and reaches the process set sealing pressure, stop turning the adjusting bolts. The position is fixed by relying on the self-locking of the threads.

[0017] S5 Hot Re-tightening: After the electric furnace is heated to the working temperature, it is held for 30 minutes, and then hot re-tightening is performed again through the precision adjustment mechanism to compensate for the change in clamping force caused by thermal expansion;

[0018] S6 Circulating Water: Circulating cooling water is introduced into the water-cooling channel through the inlet. After circulating and exchanging heat in the water-cooling channel inside the furnace cover body, the cooling water is discharged from the outlet.

[0019] Preferably, in step S4, pressure is applied in stages according to the design clamping force of 30%, 50%, 80%, and 100%, and each stage of pressure is maintained for 2-3 minutes to cause the composite sealing mechanism to produce a preset deformation.

[0020] Preferably, in step S6, a small flow rate is used for trial operation at the initial stage of water supply to check for leaks in the water cooling channel before switching to the rated water flow rate.

[0021] The present invention has the following beneficial effects:

[0022] 1. This device, through its guiding and alignment mechanism, completely overcomes the shortcomings of traditional electric furnace covers, such as large deviations during manual alignment, easy misalignment during operation, and easy jamming due to high-temperature thermal expansion. Relying on the interlocking of the guide ribs and the limiting grooves, it achieves automatic and precise alignment between the furnace cover body and the furnace flange, avoiding the eccentricity and misalignment problems caused by manual alignment and ensuring uniform contact between the furnace cover and the flange mating surfaces. Simultaneously, the locating pins provide circumferential restraint after the cover is closed, effectively resisting equipment vibration during electric furnace smelting and preventing circumferential misalignment or localized gaps during furnace cover operation. The thermal expansion compensation gap reserved between the guide ribs and the side wall of the limiting grooves can accommodate the thermal expansion deformation of metal under long-term high-temperature operation of ultra-high-power electric furnaces, avoiding structural compression and jamming under high-temperature conditions.

[0023] 2. The precision adjustment mechanism of this device overcomes the drawbacks of traditional furnace cover bolt tightening, which relies entirely on manual experience, resulting in uncontrollable pressure and uneven force distribution. Using the integrally formed mounting ears on the edge of the furnace cover as the installation reference, and in conjunction with the matching transmission between the adjusting bolts and the flange thread structure, multi-point independent fine-tuning tightening operations can be achieved. Real-time acquisition of tightening load data via pressure sensors eliminates the traditional, rough operation mode of manual judgment, enabling precise control of the pressure value at each tightening point. Combined with the staged pressurization installation process, this ensures uniform and consistent force distribution across the entire flange circumference sealing structure.

[0024] 3. This device adopts a multi-layered composite sealing mechanism, overcoming the technical shortcomings of traditional single-layer sealing structures, such as poor high-temperature resistance, insufficient elasticity, and easy aging and failure. The high-temperature resistant ceramic fiber layer at the bottom has excellent heat insulation and high-temperature resistance, which can isolate the high-temperature radiation inside the furnace and prevent the high-temperature heat source from directly eroding the main sealing structure; the corrugated metal layer in the middle provides continuous elastic compensation, and together with the internal elastic support, it can effectively prevent the corrugated structure from collapsing under pressure and undergoing permanent deformation, maintaining a good elastic rebound effect, and adapting to the slight deformation and vibration gaps of the furnace body; the graphite sealing layer at the top has excellent fit, airtightness, and wear resistance, which can tightly fit the furnace cover mating surface and fill the tiny assembly gaps. The three-layer structure works together and complements each other, completely solving the problems of high-temperature cracking, rebound failure, and flue gas leakage of traditional sealing structures, and is suitable for the harsh operating environment of ultra-high power electric furnaces with long-term high temperature and high vibration.

[0025] 4. This device features a built-in water-cooling circulation structure, effectively solving the problems of poor heat dissipation and rapid aging and failure of the sealing structure caused by high-temperature heat accumulation in traditional electric furnace covers. A continuous circulating water path is formed through the inlet and outlet at the top of the furnace cover, allowing cooling water to continuously circulate and exchange heat within the water-cooling channels inside the furnace cover body. This continuously removes the high-temperature heat accumulated in the furnace cover, continuously reducing the operating temperature of the furnace cover body and the bottom sealing mechanism. This effectively avoids the problems of carbonization, hardening, cracking, and aging of the sealing layer caused by continuous high-temperature baking, greatly extending the service life of the composite sealing mechanism. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the furnace cover body and the furnace flange in this invention;

[0027] Figure 2 This is a front view of the furnace cover body and the furnace flange in this invention;

[0028] Figure 3 This is a top view of the furnace cover body and the furnace flange in this invention;

[0029] Figure 4 This is a split view of the furnace cover body and the furnace flange in this invention;

[0030] Figure 5 This is a top view of the furnace flange in this invention;

[0031] Figure 6 This is a schematic diagram of the structure of the high-temperature resistant ceramic fiber layer, graphite sealing layer, and metal corrugated layer in this invention;

[0032] Figure 7 This is a cross-sectional view of the water cooling channel of the furnace cover body in this invention.

[0033] Legend:

[0034] 1. Furnace cover body; 2. Furnace body flange; 3. Guide alignment mechanism; 3-1. Guide rib; 3-2. Limiting groove; 3-3. Positioning pin; 4. Precision adjustment mechanism; 4-1. Mounting ear; 4-2. Adjusting bolt; 4-3. Pressure sensor; 4-4. Threaded hole; 5. Composite sealing mechanism; 5-1. High-temperature resistant ceramic fiber layer; 5-2. Graphite sealing layer; 5-3. Metal corrugated layer; 5-4. Elastic support component; 6. Water inlet; 7. Water outlet; 8. Water cooling channel. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1, refer to Figures 1-7 A sealing device for an ultra-high power electric furnace cover includes a furnace cover body 1 and a furnace flange 2. The mating surfaces of the furnace cover body 1 and the furnace flange 2 are equipped with a composite sealing mechanism 5 and a guiding alignment mechanism 3, which simultaneously meets the requirements of equipment sealing protection and precise alignment, ensuring uniform sealing from a structural perspective. Precision adjustment mechanisms 4 are evenly distributed along the edges of the furnace cover body 1, enabling multi-point uniform pressure adjustment. The guiding alignment mechanism 3 includes guide ribs 3-1 and limiting grooves 3-2. The guide ribs 3-1 are intermittently distributed along the circumference of the furnace cover body 1, and the limiting grooves 3-2 are formed on the furnace flange 2. The guide ribs 3-1 can be precisely inserted into the limiting grooves 3-2 to complete the cover alignment. A thermal expansion compensation gap is reserved between the side wall of the guide ribs 3-1 and the inner wall of the limiting grooves 3-2 to accommodate high-temperature metal deformation and prevent structural compression and jamming. The limiting groove 3-2 is equipped with a positioning pin 3-3, and the bottom of the guide rib 3-1 is provided with a matching positioning pin hole. The locking and limiting are achieved through the cooperation of the pin hole, which effectively resists the displacement of the furnace cover caused by equipment vibration.

[0037] Example 2, refer to Figures 1-7 Based on Example 1, the composite sealing mechanism 5 is composed of a high-temperature resistant ceramic fiber layer 5-1, a metal corrugated layer 5-3, and a graphite sealing layer 5-2 stacked from bottom to top. The three layers are arranged in layers. The bottom high-temperature resistant ceramic fiber layer 5-1 has extremely strong heat insulation and high-temperature resistance, which can isolate the high-temperature radiant heat flow inside the furnace and protect the upper sealing structure from direct baking and erosion by high temperatures. The middle metal corrugated layer 5-3 has excellent elastic deformation capability, which can adapt to gaps caused by equipment vibration and minor deformation, continuously providing sealing compensation. The top graphite sealing layer 5-2 has excellent fit and airtightness, which can fill tiny assembly gaps and effectively prevent flue gas leakage. The multi-layered structure significantly improves the overall sealing reliability and adaptability to operating conditions.

[0038] The metal corrugated layer 5-3 adopts an annular corrugated pipe structure, and its overall shape is adapted to the assembly requirements of the annular sealing surface of the furnace cover. Elastic support members 5-4 are fixedly installed between the crests and troughs of the corrugated pipe. These elastic support members provide continuous support and limit the corrugated structure, effectively preventing the corrugated pipe from collapsing or undergoing plastic deformation under long-term pressure. This ensures the continuous and stable elastic resilience of the metal corrugated layer, guaranteeing good sealing compensation capabilities even under equipment vibration and micro-deformation conditions.

[0039] The precision adjustment mechanism 4 includes an adjusting bolt 4-2 and a pressure sensor 4-3. The furnace cover body 1 has an integrally formed mounting lug 4-1 along its edge. This integral structure has no seams, resulting in higher structural strength and less deformation under stress, providing a flat and stable assembly reference for pressure adjustment. The furnace flange 2 has a threaded hole 4-4 that precisely matches the adjusting bolt 4-2. The adjusting bolt 4-2 passes through the mounting lug 4-1 and forms a threaded connection with the threaded hole 4-4, achieving precise downward pressure adjustment through threaded feed. The pressure sensor 4-3 is clamped between the head of the adjusting bolt 4-2 and the mounting lug 4-1, enabling real-time dynamic acquisition of sealing and tightening pressure data. This allows for quantitative control of pressure values, completely abandoning the traditional, crude method of relying on manual pressure adjustment, precisely controlling the pressure at each tightening point, and ensuring uniform and consistent sealing force throughout the circumference.

[0040] The furnace cover body 1 has an internal water-cooling channel 8. This built-in, continuous water-cooling channel provides a dedicated flow path for cooling water circulation and heat exchange, allowing the cooling water to fully circulate and exchange heat within the furnace cover body 1, continuously removing the high-temperature heat accumulated in the furnace cover. Through active water cooling, the long-term operating temperature of the furnace cover body 1 and the bottom sealing mechanism is significantly reduced, avoiding carbonization, hardening, cracking, and aging of the sealing structure caused by continuous high-temperature baking. This effectively extends the service life of the sealing components from a temperature control perspective, stabilizing the long-term sealing performance of the equipment. The top of the furnace cover body 1 has a water inlet 6 and a water outlet 7, which are interconnected by the water-cooling channel 8. The water inlet 6, water outlet 7, and internal water-cooling channel 8 together form a closed-loop water circulation heat exchange system, ensuring that cooling water can stably flow in from the water inlet 6, fully complete heat exchange within the water-cooling channel 8, and then smoothly discharge from the water outlet 7.

[0041] Example 3, referring to Figures 1-7 A method for installing a sealing device for an ultra-high power electric furnace cover includes the following steps:

[0042] S1 Benchmark Inspection: Clean the upper surface of furnace flange 2, thoroughly remove surface oxide scale, dust and impurities to ensure that the assembly base surface is clean and tidy, accurately measure the flatness of furnace flange 2 and record the high point position, and make targeted adjustments to the uneven parts, so as to provide a flat, uniform and reliable installation benchmark for subsequent sealing assembly, and avoid the problem of local pressure failure of the seal from the source.

[0043] S2 Sealing Mechanism Installation: A high-temperature resistant ceramic fiber layer 5-1, a metal corrugated layer 5-3, and a graphite sealing layer 5-2 are sequentially laid on the furnace flange 2 to assemble the composite sealing mechanism 5. This layered and orderly laying ensures the alignment and regularity of each layer. Elastic support components 5-4 are pre-assembled inside the metal corrugated layer 5-3 to reinforce the stability of the corrugated structure and prevent failure due to subsequent pressure deformation. High-temperature sealant is evenly applied between each layer to effectively fill the tiny gaps between layers, enhancing the overall fit and airtightness of the multi-layer structure and improving the overall sealing effect.

[0044] S3 Positioning and Lid Closing: Hoist the furnace cover body 1, aligning the guide rib 3-1 with the limiting groove 3-2, and lower it vertically and smoothly to avoid deviation or collision during hoisting. The positioning pin 3-3 at the limiting groove 3-2 is inserted into the corresponding positioning pin hole at the bottom of the guide rib 3-1 to achieve precise locking and positioning. A thermal expansion compensation gap is reserved between the guide rib 3-1 and the inner wall of the limiting groove 3-2 to accommodate metal thermal deformation under high-temperature smelting conditions, preventing structural compression and jamming, and furnace cover warping. This ensures precise and stable high-precision alignment and assembly of the furnace cover body 1 and the furnace flange 2.

[0045] S4 Pressure Control: Tighten each adjusting bolt 4-2 of the precision adjustment mechanism 4 one by one. The adjusting bolt 4-2 is smoothly screwed downwards along the threaded hole 4-4, achieving precise downward pressure through thread transmission. The bolt head directly applies pressure to the pressure sensor 4-3, which dynamically monitors the sealing and tightening load in real time. Operators can control the tightening degree based on accurate data. Continue tightening each adjusting bolt 4-2. When the pressure collected by the pressure sensor 4-3 reaches the process-set sealing pressure, stop tightening the adjusting bolt 4-2. The self-locking performance of the thread stably locks the tightening stroke, effectively preventing pressure attenuation due to long-term vibration and ensuring constant sealing pressure.

[0046] S5 Hot Re-tightening: After the electric furnace is heated to the working temperature, it is held for 30 minutes to allow the furnace cover and flange metal structure to fully complete the thermal expansion deformation. Then, it is hot re-tightened again through the precision adjustment mechanism 4 to accurately compensate for the pressure loss caused by high temperature thermal deformation, solve the industry pain point of high temperature pressure relief and leakage during normal temperature assembly, and ensure the sealing stability under high temperature conditions.

[0047] S6 Circulating Water: Circulating cooling water is introduced into the water-cooling channel 8 through the inlet 6. The cooling water circulates and exchanges heat fully in the water-cooling channel 8 inside the furnace cover body 1, and carries away the heat accumulated in the furnace cover from all directions before being discharged from the outlet 7. Through continuous water circulation and cooling, the working temperature of the sealing mechanism is reduced, the high-temperature aging speed of the sealing components is slowed down, and the performance of the sealing structure is protected for a long time.

[0048] In step S4, pressure is applied in stages according to the design clamping force of 30%, 50%, 80%, and 100%, and maintained for 2-3 minutes after each stage of pressure application. This segmented, step-by-step pressure application and stabilization method allows the multi-layered structure of the composite sealing mechanism to gradually undergo uniform deformation, ensuring that each sealing layer is fully adhered and compacted. This effectively avoids problems such as gasket crushing, uneven deformation, and interlayer voids caused by one-time high-pressure clamping, significantly improving the overall sealing uniformity and molding stability.

[0049] In step S6, a low-flow-rate trial run is used during the initial water supply phase. The slow water flow allows the water to slowly pass through all the pipe areas of the water-cooled channel 8, facilitating a comprehensive inspection by staff to identify hidden faults such as blockages, leaks, and obstructions in the water system. Once it is confirmed that the water-cooled channel 8 is unobstructed and leak-free, and that the water circulation is operating normally, the flow rate is then switched to the rated flow rate for routine heat exchange operations.

[0050] Working principle: During equipment assembly, the furnace cover body 1 is lowered using hoisting equipment. The guide rib 3-1 on the lower end face of the furnace cover body 1 is aligned with the limiting groove 3-2 opened on the top surface of the furnace flange 2 and falls vertically into it. The positioning pin 3-3 installed in the limiting groove 3-2 is inserted into the pre-reserved pin hole at the bottom of the guide rib 3-1 to achieve circumferential limiting. The gap left on the side wall of the guide rib 3-1 and the limiting groove 3-2 serves as a thermal expansion compensation margin to offset the dimensional deformation caused by the thermal expansion of the metal after the electric furnace operates at high temperature. The composite sealing mechanism 5 is clamped between the mating end faces of the furnace cover body 1 and the furnace flange 2. The composite sealing mechanism 5 is composed of a bottom high-temperature resistant ceramic fiber layer 5-1, a middle metal corrugated layer 5-3, and a top graphite sealing layer 5-2 stacked layer by layer. The elastic support member 5-4 arranged inside the metal corrugated layer 5-3 continuously supports the corrugated pipe structure. It relies on the sealing properties and elastic deformation of the multi-layer material itself to fill the small gaps between the furnace flange 2 and the furnace cover body 1, preventing smelting flue gas from leaking outward from the assembly gap.

[0051] After the furnace cover is aligned, the sealing pressure is calibrated by a precision adjustment mechanism 4 evenly distributed along the outer edge of the furnace cover body 1. The precision adjustment mechanism 4 includes an integrally formed mounting lug 4-1 on the edge of the furnace cover body 1, an adjusting bolt 4-2, a pressure sensor 4-3, and a threaded hole 4-4 inside the furnace flange 2. The operator screws the adjusting bolt 4-2 down step by step, and the bolt end presses against the pressure sensor 4-3 located above the mounting lug 4-1. The pressure sensor 4-3 provides real-time feedback of the pressing value. The pressure is increased step by step to the standard pressure based on the reading, and then screwing is stopped. The pressing stroke is locked by the self-locking thread of the adjusting bolt 4-2, stabilizing the compression of the composite sealing mechanism 5. During the smelting operation, cooling water is sent from the inlet 6 into the water cooling channel 8 inside the furnace cover body 1. The cooling water flows along the water cooling channel 8 to carry away the high-temperature heat accumulated in the furnace cover body 1. The water that has absorbed heat is finally discharged from the outlet 7.

[0052] Finally, it should be noted that the above description 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 foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sealing device for an ultra-high power electric furnace lid, characterized in that, It includes a furnace cover body (1) and a furnace body flange (2); the mating surfaces of the furnace cover body (1) and the furnace body flange (2) are provided with a composite sealing mechanism (5) and a guide alignment mechanism (3); and precision adjustment mechanisms (4) are evenly distributed at the edges of the furnace cover body (1). The guiding alignment mechanism (3) includes a guide rib (3-1) and a limiting groove (3-2); the guide rib (3-1) is intermittently distributed along the circumference of the furnace cover body (1), the limiting groove (3-2) is opened on the furnace body flange (2), the guide rib (3-1) is inserted into the limiting groove (3-2), a thermal expansion compensation gap is reserved between the side wall of the guide rib (3-1) and the inner wall of the limiting groove (3-2), a positioning pin (3-3) is provided on the limiting groove (3-2), and a positioning pin hole matching the positioning pin (3-3) is opened at the bottom of the guide rib (3-1).

2. The sealing device for an ultra-high power electric furnace cover according to claim 1, characterized in that: The composite sealing mechanism (5) is composed of a high-temperature resistant ceramic fiber layer (5-1), a metal corrugated layer (5-3), and a graphite sealing layer (5-2) stacked from bottom to top.

3. The sealing device for an ultra-high power electric furnace cover according to claim 2, characterized in that: The metal corrugated layer (5-3) is an annular corrugated tube structure, and an elastic support member (5-4) is provided between the crests and troughs of the corrugated tube.

4. The sealing device for an ultra-high power electric furnace cover according to claim 1, characterized in that: The precision adjustment mechanism (4) includes an adjustment bolt (4-2) and a pressure sensor (4-3); the edge of the furnace cover body (1) is integrally provided with a mounting ear (4-1), and the furnace flange (2) is provided with a threaded hole (4-4) that matches the adjustment bolt (4-2). The adjustment bolt (4-2) passes through the mounting ear (4-1) and is threadedly connected to the threaded hole (4-4) of the furnace flange (2). The pressure sensor (4-3) is sandwiched between the head of the adjustment bolt (4-2) and the mounting ear (4-1).

5. The sealing device for an ultra-high power electric furnace cover according to claim 1, characterized in that: The furnace cover body (1) has a water cooling channel (8) inside.

6. The sealing device for an ultra-high power electric furnace cover according to claim 5, characterized in that: The top of the furnace cover body (1) is provided with a water inlet (6) and a water outlet (7), and the water cooling channel (8) is connected to the water inlet (6) and the water outlet (7).

7. A method for installing a sealing device for an ultra-high power electric furnace cover, characterized in that, Includes the following steps: S1 benchmark test: Clean the upper surface of the furnace flange (2), measure the flatness of the furnace flange (2) and record the position of the high point; S2 sealing mechanism installation: Lay high temperature resistant ceramic fiber layer (5-1), metal corrugated layer (5-3), and graphite sealing layer (5-2) sequentially on the furnace flange (2) to assemble the composite sealing mechanism (5). The metal corrugated layer (5-3) is pre-assembled with elastic support (5-4), and high temperature sealant is applied between each layer. S3 Positioning and Closing: Hoist the furnace cover body (1), align the guide rib (3-1) with the limiting groove (3-2) and lower it vertically. Insert the positioning pin (3-3) at the limiting groove (3-2) into the positioning pin hole at the bottom of the guide rib (3-1). Leave a thermal expansion compensation gap between the guide rib (3-1) and the inner wall of the limiting groove (3-2) to complete the alignment of the furnace cover body (1) and the furnace flange (2). S4 Pressure Control: Tighten the adjusting bolts (4-2) of the precision adjusting mechanism (4) one by one. The adjusting bolts (4-2) are screwed down along the threaded hole (4-4). The head of the bolt is directly pressed against the pressure sensor (4-3). The pressure sensor (4-3) monitors the sealing pressure load in real time and continuously tightens each adjusting bolt (4-2). When the pressure collected by the pressure sensor (4-3) reaches the process set sealing pressure, stop turning the adjusting bolts (4-2) and fix the position by relying on the self-locking of the thread. S5 Hot Re-tightening: After the electric furnace is heated to the working temperature, it is kept for 30 minutes, and then hot re-tightening is performed again through the precision adjustment mechanism (4) to compensate for the change in clamping force caused by thermal expansion; S6 Circulating water: Circulating cooling water is introduced into the water cooling channel (8) through the water inlet (6). After the cooling water flows and exchanges heat in the water cooling channel (8) inside the furnace cover body (1), it is discharged from the water outlet (7).

8. The installation method of the sealing device for an ultra-high power electric furnace cover according to claim 7, characterized in that: In step S4, pressure is applied in stages according to the design clamping force of 30%, 50%, 80%, and 100%, and each stage of pressure is maintained for 2-3 minutes to cause the composite sealing mechanism to produce a preset deformation.

9. The installation method of the sealing device for an ultra-high power electric furnace cover according to claim 7, characterized in that: In step S6, a small flow rate is used for trial operation in the initial stage of water supply. After checking for leakage in the water cooling channel (8), the flow rate is switched to the rated flow rate.

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