Independent semi-tilting electric arc furnace and operation method thereof

Abstract

The invention relates to an independent semi-tilting electric arc furnace and an operation method thereof, the electric arc furnace comprises a furnace body, a large furnace cover and a small furnace cover, the furnace body is connected with a tilting mechanism, and the small furnace cover is provided with a small furnace cover lifting mechanism; an annular sealing wall is arranged on the large furnace cover in an upward protruding mode, an annular slit groove is formed in the small furnace cover, the bottom face of the small furnace cover is concaved upwards to form the annular slit groove, and the annular sealing wall is inserted into the annular slit groove. The width of the annular slit groove is larger than the thickness of the annular sealing wall, and the difference between the width of the annular slit groove and the thickness of the annular sealing wall is designed to enable the annular sealing wall not to interfere with the small furnace cover when the large furnace cover tilts. When the tilting operation is executed, only the furnace body and the large furnace cover need to tilt, and the small furnace cover and the electrode do not need to tilt, so that the load of the tilting platform is greatly reduced, the steel tapping and sand filling operations are simple, convenient, safe and reliable, the load of the tilting cylinder is reduced, and the working conditions of the tilting cylinder are more reasonable and safer. The annular sealing wall and the annular slit groove can be matched to form a labyrinth sealing effect, and the situation that a large amount of smoke leaks between the annular sealing wall and the annular slit groove is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of electric arc furnace smelting, and in particular relates to an independent semi-tilting electric arc furnace and an operating method thereof. Background Art

[0002] At present, the types of electric arc furnace equipment tend to be mature and fixed, and are basically evolved from top-loading electric furnaces, vertical furnaces and horizontal loading electric furnaces. Due to the slag-free steel-making and sand-filling operations, most electric furnaces need to tilt the furnace body forward and backward. The furnace cover is directly placed on the three-dimensional space, which will inevitably cause the furnace cover to tilt forward and backward with the furnace body. However, since the electrode extends into the furnace from the electrode hole in the center of the furnace cover, the electrode must also tilt together (if the electrode is lifted above the furnace cover, the electrode lifting stroke is too high, and the heat radiation of the electrode greatly shortens the service life of the furnace top equipment). Finally, the conductive cross arm and the electrode lifting device must tilt together with the furnace body, especially in the structural form with a slewing bearing as the conductive cross arm and the lifting column support. The entire platform for placing the furnace body and the platform for installing the slewing support tilt at the same time, which is equivalent to the tilting cylinder driving the entire large platform and all the equipment installed on it to tilt, which puts high demands on the processing and manufacturing of the large platform and the force and energy parameters of the tilting cylinder; and the simultaneous tilting of the entire huge system will lead to an increase in the investment in public and auxiliary equipment, and a high space requirement within the tilting trajectory, a sharp increase in the risk factor of the equipment, and huge losses in the event of an accident. Summary of the invention

[0003] The invention relates to an independent semi-tilting electric arc furnace and an operating method thereof, which can at least solve some defects of the prior art.

[0004] The present invention relates to an independent semi-tilting electric arc furnace, comprising a furnace body, a large furnace cover and a small furnace cover, wherein the small furnace cover is provided with electrode holes, the furnace body is connected with a tilting mechanism, and the small furnace cover is provided with a small furnace cover lifting mechanism;

[0005] An annular sealing wall protrudes upward from the large furnace cover, and an annular slit groove is opened in the small furnace cover. The annular slit groove is formed by being recessed upward from the bottom surface of the small furnace cover, and the annular sealing wall is inserted into the annular slit groove. The groove width of the annular slit groove is greater than the thickness of the annular sealing wall, and the difference between the two is designed so that the annular sealing wall does not interfere with the small furnace cover when the large furnace cover is tilted.

[0006] As one of the implementation modes, the depth of the annular slit groove is not less than the height of the annular sealing wall.

[0007] As one of the implementation modes, the annular sealing wall is an elliptical annular wall, the annular slit groove is an elliptical annular groove, and the long axis directions of both are parallel to the direction of the line connecting the front and rear of the furnace.

[0008] As one of the implementation modes, the inner ring of the annular slit groove is chamfered.

[0009] As one of the implementation modes, the large furnace cover is provided with a rotary drive mechanism, and the rotary drive mechanism is arranged on a workshop foundation and is detachably matched with the large furnace cover.

[0010] As one of the implementation modes, the small furnace cover lifting mechanism is arranged on the rotating frame of the rotary drive mechanism.

[0011] As one of the implementation modes, the small furnace cover lifting mechanism is detachably connected to the small furnace cover.

[0012] As one of the implementation modes, a large furnace cover lifting mechanism is provided on the rotating frame of the rotary drive mechanism, and the large furnace cover lifting mechanism is detachably matched with the large furnace cover.

[0013] The present invention also relates to a method for operating the independent semi-tilting electric arc furnace as described above, comprising:

[0014] When it is necessary to tap steel, the small furnace cover is lifted to a set height, and the furnace body is tilted by the tilting mechanism to tap steel. The large furnace cover tilts with the furnace body and drives the annular sealing wall to rotate relative to the small furnace cover, wherein no interference occurs between the annular sealing wall and the small furnace cover, and the annular sealing wall does not separate from the annular slit groove;

[0015] After the steel is tapped, the furnace body and the small furnace cover are reset.

[0016] Furthermore, the operation method also includes:

[0017] When it is necessary to replace or align the electrodes, drive each electrode to a high position, and drive the conductive cross arm and the electrode to turn to the steel-out side to replace or align the electrodes; during the electrode outflow process, the small furnace cover lifting mechanism is separated from the small furnace cover to prevent the small furnace cover from rotating with the electrodes;

[0018] When the large furnace cover needs to be replaced, the small furnace cover is lifted to the highest point through the small furnace cover lifting mechanism, so that the small furnace cover is completely separated from the large furnace cover, and the electrode is driven to be transferred to the steel-out side together with the small furnace cover, and the large furnace cover can be lifted by a crane to the maintenance area for maintenance;

[0019] When the furnace body needs to be replaced or repaired, the large furnace cover is lifted up. When the large furnace cover is lifted to a high position, the large furnace cover, small furnace cover and electrode are driven to rotate to the steel-outlet side, and then the furnace body is lifted by a crane to the maintenance area for repair.

[0020] The present invention has at least the following beneficial effects:

[0021] In the present invention, the annular sealing wall on the large furnace cover cooperates with the annular slit groove on the small furnace cover. When performing the tilting operation, only the furnace body and the large furnace cover need to be tilted, and the small furnace cover and the electrode do not need to be tilted. Therefore, the load of the tilting platform is greatly reduced, and the large-scale movement caused by the tilting of other equipment is avoided, so that the steel tapping and sand filling operations are simple, safe and reliable, and the load of the tilting cylinder is reduced, making the working conditions more reasonable and safe. Based on the cooperation between the annular sealing wall and the annular slit groove, a labyrinth sealing effect can be formed, avoiding the situation where a large amount of smoke leaks from between the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of an independent semi-tilting electric arc furnace provided in an embodiment of the present invention;

[0024] Figure 2 A top view of an independent semi-tilting electric arc furnace provided in an embodiment of the present invention (including two states of the large furnace cover);

[0025] Figure 3 A schematic diagram of the tilting state of an independent semi-tilting electric arc furnace provided in an embodiment of the present invention;

[0026] Figure 4 A schematic diagram of the structure of a large furnace cover lifting mechanism and a small furnace cover lifting mechanism provided in an embodiment of the present invention;

[0027] Figure 5 It is a schematic diagram of the coordination between the hook and the lifting ring;

[0028] Figure 6 It is a schematic diagram of the matching of the guide rod and guide hole with a cross-shaped cross section. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figure 1-Figure 4The embodiment of the present invention provides an independent semi-tilting electric arc furnace, comprising a furnace body 11, a large furnace cover 12 and a small furnace cover 13, wherein the small furnace cover 13 is provided with electrode holes, the furnace body 11 is connected with a tilting mechanism 14, and the small furnace cover 13 is provided with a small furnace cover lifting mechanism 27;

[0031] An annular sealing wall 120 protrudes upward from the large furnace cover 12, and an annular slit groove 130 is opened in the small furnace cover 13. The annular slit groove 130 is formed by being recessed upward from the bottom surface of the small furnace cover 13, and the annular sealing wall 120 is inserted into the annular slit groove 130. The groove width of the annular slit groove 130 is greater than the thickness of the annular sealing wall 120, and the difference between the two is designed so that the annular sealing wall 120 does not interfere with the small furnace cover 13 when the large furnace cover 12 is tilted.

[0032] The large furnace cover 12 and the furnace body 11 are designed to be a detachable connection structure, so as to facilitate the inspection and maintenance of the large furnace cover 12 and the furnace body 11. A hoisting structure is provided on the large furnace cover 12 so that it can be hoisted.

[0033] In one embodiment, the large furnace cover 12 is a frame-type water-cooling structure, which is composed of a plurality of water-cooling plates suspended on the water-cooling frame. The water-cooling frame is not only a structural support, but also a channel for water supply and drainage of the water-cooling plates.

[0034] The electrode holes on the small furnace cover 13 are used for the electrodes 21 to pass through. Generally, there are three electrodes 21 distributed in a triangle, and there are correspondingly three electrode holes distributed in a triangle.

[0035] Preferably, the furnace body 11 is an eccentric structure, and the steel outlet is arranged in the eccentric area, so that slag-free steel can be tapped. Optionally, the lower part of the furnace body 11 is built with refractory materials to protect the furnace body 11 when smelting molten steel; the upper part of the furnace body 11 is provided with a water-cooled furnace wall (water cooling), which can extend the service life of the furnace body 11.

[0036] Optionally, the tilting mechanism 14 includes a tilting platform and a tilting cylinder 141, and the furnace body 11 is arranged on the tilting platform, preferably installed on the upper surface of the tilting platform through positioning pins; the tilting platform is movably arranged on the workshop foundation, including but not limited to an arc-shaped support frame 143 is arranged on both sides of the bottom of the tilting platform, and each arc-shaped support frame 143 is supported by a rotating wheel 142 fixed on the workshop foundation; the cylinder body of the tilting cylinder 141 is hinged on the workshop foundation, and the output end of the tilting cylinder 141 is hinged to the tilting platform; under the drive of the tilting cylinder 141, the entire tilting platform can rotate relative to the workshop foundation, and finally realize rapid steel tapping and expose the steel tapping port in the furnace for sand filling, etc.

[0037] Preferably, the large furnace cover 12 is provided with a rotary drive mechanism for driving the large furnace cover 12 to rotate in a horizontal plane, so that the large furnace cover 12 can be peeled off from the furnace body 11 or covered onto the furnace body 11, wherein the rotary drive mechanism is arranged on the workshop foundation and does not need to be tilted with the tilting platform, thereby effectively reducing the difficulty of tilting and reducing the requirements for equipment such as the tilting platform and the tilting cylinder 141, thereby reducing costs and improving production safety.

[0038] like Figure 1 The rotary drive mechanism includes a rotary frame 20 and a rotary drive unit for driving the rotary frame 20 to rotate. The rotary frame 20 is rotatably mounted on the workshop foundation, including but not limited to a rotary bearing 24 provided on the workshop foundation. The rotary bearing 24 includes a rotationally matched support outer ring and a support inner ring, and the rotary frame 20 is connected to the support outer ring or the support inner ring. The rotary drive unit can adopt a conventional rotary drive device, which is not exemplified here.

[0039] Generally, the electrode 21 is provided with an electrode lifting and lowering driving mechanism, which can adjust the height of the electrode 21 in real time. Figure 1 The electrode lifting drive mechanism includes a lifting column 23 and an electrode lifting drive cylinder 25 for driving the lifting column 23 to lift. The electrode 21 can be installed on the lifting column 23 through a conductive cross arm 22. The lifting column 23 drives the conductive cross arm 22 to lift and lower, thereby achieving the lifting of the electrode 21. In one embodiment, Figure 1 The rotating frame 20 is a hollow structure, the lifting column 23 is installed in the rotating frame 20, and the bottom end of the lifting column 23 extends out of the bottom end of the rotating frame 20 and is connected to the electrode lifting drive cylinder 25, and the top end of the lifting column 23 extends out of the top end of the rotating frame 20 to facilitate the installation of the conductive cross arm 22. Further, in order to ensure that the electrode 21 can be lifted vertically and avoid the electrode 21 and the electrode hole from being damaged by mutual collision and friction, a column guide structure can be set in the rotating frame 20 to ensure that the lifting column 23 does not swing when it rises and falls, and the column guide structure includes but is not limited to the use of multiple guide wheels and the lifting column 23 for guiding cooperation.

[0040] Preferably, the rotary drive mechanism and the large furnace cover 12 are detachably matched, which can improve the operational flexibility of the electric arc furnace. For example, after the rotary drive mechanism is separated from the large furnace cover 12, the large furnace cover 12 can be easily tilted with the furnace body 11.

[0041] In one embodiment, if Figure 1 , Figure 2 and Figure 4A large furnace cover lifting mechanism is arranged on the rotating frame 20 of the rotary drive mechanism, and the large furnace cover lifting mechanism is detachably matched with the large furnace cover 12, that is, the detachable matching relationship between the rotary drive mechanism and the large furnace cover 12 can be realized through the large furnace cover lifting mechanism; by configuring the large furnace cover lifting mechanism, the large furnace cover 12 can be lifted only, the large furnace cover 12 can be lifted and rotated, etc., thereby improving the operational flexibility of the electric arc furnace, and reducing the interference between the large furnace cover 12 and the furnace body 11 during rotation.

[0042] In one embodiment, if Figure 1 and Figure 4 The large furnace cover lifting mechanism includes a lifting frame 26 and a large furnace cover lifting power unit 260 for driving the lifting frame 26 to lift and lower. The large furnace cover lifting power unit 260 is installed on the rotating frame 20; a first docking and matching unit is provided on the lifting frame 26, and a second docking and matching unit is provided on the large furnace cover 12. The lifting frame 26, driven by the large furnace cover lifting power unit 260, can drive the first docking and matching unit to couple or separate with the second docking and matching unit. After the first docking and matching unit is coupled with the second docking and matching unit, the connection between the lifting frame 26 and the large furnace cover 12 is realized. When the lifting frame 26 rises further, it can drive the large furnace cover 12 to rise. When the lifting frame 26 descends, it can drive the large furnace cover 12 to descend until the first docking and matching unit is separated from the second docking and matching unit. At this time, the separation between the lifting frame 26 and the large furnace cover 12 is realized.

[0043] Alternatively, if Figure 4 The first docking and matching unit includes a positioning head 262 and a lifting support plate 261. The positioning head 262 is arranged at the top of the lifting frame 26, and the lifting support plate 261 is arranged at one end of the lifting frame 26 close to the furnace body 11; correspondingly, the second docking and matching unit includes a lifting positioning hole 152 and a lifting support plate 151 arranged on the large furnace cover 12, wherein the lifting positioning hole 152 is located directly above the positioning head 262, and the lifting support plate 151 is located directly above the lifting support plate 261. When the positioning head 262 is inserted into the positioning hole, the lifting support plate 261 abuts against the lifting support plate 151, thereby realizing the coupling between the lifting frame 26 and the large furnace cover 12. Figure 1 , Figure 2 and Figure 4 A support arm 15 can be extended from the large furnace cover 12 , and a lifting positioning hole 152 and a lifting support plate 151 are arranged on the support arm 15 , which can facilitate the coupling and separation with the lifting frame 26 .

[0044] Preferably, a lifting frame guide structure 263 can be set on the rotating frame 20 to ensure that the lifting frame does not swing when it rises and falls. The lifting frame guide structure 263 includes but is not limited to the use of a guide column and a guide wheel. The guide column can be set on the lifting frame and cooperate with the guide wheel set on the rotating frame 20.

[0045] The above-mentioned large furnace cover lifting power unit 260 includes but is not limited to the use of a hydraulic cylinder, etc., and one or more groups of large furnace cover lifting power units 260 can be set.

[0046] In one embodiment, if Figure 1 , Figure 2 and Figure 4 The small furnace cover lifting mechanism 27 is arranged on the rotating frame 20 of the rotary drive mechanism, which can facilitate the arrangement of the small furnace cover lifting mechanism 27 and the related operations of the small furnace cover 13, for example, the small furnace cover 13 can be rotated together with the rotating frame 20. Furthermore, the small furnace cover lifting mechanism 27 is detachably connected to the small furnace cover 13, which can improve the operational flexibility of the electric arc furnace.

[0047] In one embodiment, if Figure 1-Figure 5 The small furnace cover lifting mechanism 27 includes a hook 273 and a small furnace cover lifting power unit for driving the hook 273 to lift. Preferably, a plurality of hooks 273 are provided to improve the stability of the lifting of the small furnace cover 13. Accordingly, a plurality of lifting rings are provided on the small furnace cover 13. Preferably, the lifting ring hole 131 is designed to have a relatively large height (for example, an elliptical lifting ring hole 131 is used) to ensure that the hook 273 can freely enter and exit the lifting ring hole 131. For example, the height of the lifting ring hole 131 is greater than the hook body height h of the hook 273.

[0048] Preferably, if Figure 1 , Figure 4 and Figure 6 A hook guide unit 274 is provided on the rotating frame 20 to ensure that the hook 273 does not rotate when it is lifted or lowered, so as to ensure that the hook 273 can reliably hook the lifting ring on the small furnace cover 13 every time; the hook guide unit 274 includes but is not limited to the use of a guide rod 2741-guide hole 2742 matching form, for example, a guide hole 2742 is provided on the rotating frame 20, and the guide rod 2741 is fixedly connected to the top of the hook 273, and the guide rod 2741 and the guide hole 2742 are guided and matched to achieve the purpose of ensuring that the hook 273 does not rotate when it is lifted or lowered; further, as Figure 6 The use of a guide rod 2741 and a guide hole 2742 with a cross-shaped cross section can provide better guidance and restraint for the hook 273.

[0049] Alternatively, if Figure 4The small furnace cover lifting power unit adopts a soft chain 272 in conjunction with a pulley, which can facilitate the arrangement of these power equipment. The soft chain 272 can be a chain, a wire rope, etc.; the power equipment 271 connected to the soft chain 272 can be a linear drive device such as a hydraulic cylinder or a cylinder.

[0050] In one embodiment, if Figure 2 The annular sealing wall 120 is an elliptical annular wall, and the annular slit groove 130 is an elliptical annular groove, and the long axis directions of the two are parallel to the direction of the line connecting the front and rear of the furnace. Based on this design, the requirements for relative movement between the annular sealing wall 120 and the annular slit groove 130 can be better met, and the interference between the two can be reduced.

[0051] Among them, the groove width of the straight segment groove body of the annular slit groove 130 can be slightly larger than the thickness of the straight segment wall body of the annular sealing wall 120. For example, the gap between the straight segment groove body and the straight segment wall body can reduce the smoke leakage between the two, and through the gap matching relationship between the two, a guiding matching relationship can be achieved, which can improve the stability and accuracy of the relative movement between the annular sealing wall 120 and the annular slit groove 130.

[0052] The arcuate segment groove body of the annular slit groove 130 preferably adopts a uniform groove width, and the arcuate segment wall body of the annular sealing wall 120 preferably adopts a uniform thickness. The difference between the groove width of the arcuate segment groove body and the thickness of the arcuate segment wall meets the above-mentioned requirement of "preventing the annular sealing wall 120 from interfering with the small furnace cover 13 when the large furnace cover 12 tilts". This difference is related to factors such as the tilting angle of the furnace body 11, and is preferably controlled within the range of 50 to 100 mm.

[0053] In one embodiment, if Figure 3 and Figure 4 The inner ring of the annular slit groove 130 is chamfered. In the above-mentioned scheme of using an elliptical annular groove, at least the inner ring of the arc-shaped groove body is chamfered, so that the interference between the annular sealing wall 120 and the annular slit groove 130 during the tilting process can be further reduced. Furthermore, the inner ring wall root of the annular sealing wall 120 is thickened to form a slope angle, which is convenient for matching with the chamfer of the groove to ensure the labyrinth sealing effect between the annular slit groove 130 and the annular sealing wall 120.

[0054] Preferably, the depth of the annular slit groove 130 is not less than the height of the annular sealing wall 120, which can ensure that in a non-tilting state, the bottom end of the small furnace cover 13 is buckled on the top end of the large furnace cover 12 to ensure sealing.

[0055] The embodiment of the present invention also provides an operating method of the above-mentioned independent semi-tilting electric arc furnace, including:

[0056] When it is necessary to tap steel, the small furnace cover 13 is lifted to a set height, and the furnace body 11 is tilted to tap steel through the tilting mechanism 14. The large furnace cover 12 tilts with the furnace body 11 and drives the annular sealing wall 120 to rotate relative to the small furnace cover 13, wherein the annular sealing wall 120 does not interfere with the small furnace cover 13, and the annular sealing wall 120 does not separate from the annular slit groove 130;

[0057] After the steel is tapped, the furnace body 11 and the small furnace cover 13 are reset.

[0058] In the above-mentioned steel-tapping operation, the electrode 21 and its supporting facilities (conductive cross arm 22, lifting column 23, etc.), rotary drive mechanism (including rotating frame 20, rotary bearing 24), etc. do not need to be tilted, thereby significantly simplifying the tilting steel-tapping operation and ensuring the safety of the steel-tapping operation.

[0059] Furthermore, based on the above-mentioned independent semi-tilting electric arc furnace, its operation method also includes:

[0060] When it is necessary to replace or align the electrodes 21, each electrode 21 is driven to be lifted to a high position, and the lifting column 23, the conductive cross arm 22 and the electrode 21 are driven to turn to the steel-out side by the rotating frame 20 to replace or align the electrodes 21. During the process of rotating the electrodes 21, the small furnace cover lifting mechanism 27 is separated from the small furnace cover 13 (for example, see Figure 5 , so that the hook 273 is in the lowest position, and when the hook 273 rotates with the rotating frame 20, it is separated from the lifting ring), thereby preventing the small furnace cover 13 from rotating with the electrode 21. At this time, the small furnace cover 13 or the large furnace cover 12 can also be lifted to the maintenance and inspection area by a crane.

[0061] Furthermore, based on the above-mentioned independent semi-tilting electric arc furnace, its operation method also includes:

[0062] When the large furnace cover 12 needs to be replaced, the small furnace cover 13 is lifted to the highest point by the small furnace cover lifting mechanism 27, so that the small furnace cover 13 is completely separated from the large furnace cover 12, and then the rotating frame 20 is driven to rotate, and the electrode 21 together with the small furnace cover 13 is transferred to the steel-out side, and the large furnace cover 12 can be lifted by a crane to the maintenance area for maintenance.

[0063] Furthermore, based on the above-mentioned independent semi-tilting electric arc furnace, its operation method also includes:

[0064] When the furnace body 11 needs to be replaced or repaired, the large furnace cover lifting mechanism is activated to lift up the large furnace cover 12. Since the small furnace cover 13 is placed on the large furnace cover 12, the small furnace cover 13 is also lifted up together; when the large furnace cover 12 is lifted to a high position, the rotating frame 20 is driven to rotate, and the large furnace cover 12, the small furnace cover 13, the electrode 21, the conductive cross arm 22 and other equipment are rotated together to the steel-outlet side, and then the furnace body 11 is lifted by a crane to the maintenance area for maintenance.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An independent semi-tilting electric arc furnace, comprising a furnace body, a large furnace cover and a small furnace cover, wherein the small furnace cover is provided with electrode holes, and the furnace body is connected with a tilting mechanism, characterized in that: The small furnace cover is provided with a small furnace cover lifting mechanism; An annular sealing wall protrudes upward from the large furnace cover, and an annular slit groove is opened in the small furnace cover. The annular slit groove is formed by being recessed upward from the bottom surface of the small furnace cover, and the annular sealing wall is inserted into the annular slit groove. The groove width of the annular slit groove is greater than the thickness of the annular sealing wall, and the difference between the two is designed so that the annular sealing wall does not interfere with the small furnace cover when the large furnace cover is tilted.

2. The independent semi-tilting electric arc furnace according to claim 1, characterized in that: The depth of the annular slit groove is not less than the height of the annular sealing wall.

3. The independent semi-tilting electric arc furnace according to claim 1, characterized in that: The annular sealing wall is an elliptical annular wall, the annular slit groove is an elliptical annular groove, and the long axis directions of the two are parallel to the direction of the line connecting the front and rear of the furnace.

4. The independent semi-tilting electric arc furnace according to claim 1, characterized in that: The inner ring of the notch of the annular slit groove is chamfered.

5. The independent semi-tilting electric arc furnace according to claim 1, characterized in that: The large furnace cover is equipped with a rotary drive mechanism, which is arranged on a workshop foundation and is detachably matched with the large furnace cover.

6. The independent semi-tilting electric arc furnace according to claim 5, characterized in that: The small furnace cover lifting mechanism is arranged on the rotating frame of the rotary driving mechanism.

7. The independent semi-tilting electric arc furnace according to claim 1 or 6, characterized in that: The small furnace cover lifting mechanism is detachably connected to the small furnace cover.

8. The independent semi-tilting electric arc furnace according to claim 5, characterized in that: A large furnace cover lifting mechanism is arranged on the rotating frame of the rotary drive mechanism, and the large furnace cover lifting mechanism is detachably matched with the large furnace cover.

9. The method for operating an independent semi-tilting electric arc furnace according to any one of claims 1 to 8, characterized in that: include: When it is necessary to tap steel, the small furnace cover is lifted to a set height, and the furnace body is tilted by the tilting mechanism to tap steel. The large furnace cover tilts with the furnace body and drives the annular sealing wall to rotate relative to the small furnace cover, wherein no interference occurs between the annular sealing wall and the small furnace cover, and the annular sealing wall does not separate from the annular slit groove; After the steel is tapped, the furnace body and the small furnace cover are reset.

10. The method for operating an independent semi-tilting electric arc furnace according to claim 9, characterized in that: The operation method also includes: When it is necessary to replace or align the electrodes, drive each electrode to a high position, and drive the conductive cross arm and the electrode to turn to the steel-out side to replace or align the electrodes; during the electrode outflow process, the small furnace cover lifting mechanism is separated from the small furnace cover to prevent the small furnace cover from rotating with the electrodes; When the large furnace cover needs to be replaced, the small furnace cover is lifted to the highest point through the small furnace cover lifting mechanism, so that the small furnace cover is completely separated from the large furnace cover, and the electrode is driven to be transferred to the steel-out side together with the small furnace cover, and the large furnace cover can be lifted by a crane to the maintenance area for maintenance; When the furnace body needs to be replaced or repaired, the large furnace cover is lifted up. When the large furnace cover is lifted to a high position, the large furnace cover, small furnace cover and electrode are driven to rotate to the steel-outlet side, and then the furnace body is lifted by a crane to the maintenance area for repair.

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