A high-temperature annealing ring furnace

Abstract

This invention relates to the field of annealing furnace equipment technology, specifically a high-temperature annealing annular furnace, comprising a furnace body unit, which includes an annular furnace body. Multiple heating wires for heating are provided on the inner wall of the annular furnace body. An unfolding unit for unfolding silicon steel coils is provided at the bottom of the annular furnace body, and a stretching unit for assisting in unfolding the silicon steel coils is provided on the unfolding unit. A circulation unit for circulating hot air is also provided at the bottom of the annular furnace body. In this invention, a primary motor drives a bearing turntable to rotate via a central shaft. The bearing turntable drives the silicon steel coil to be processed to rotate. Because the inner wall of the silicon steel coil to be processed is fixed at its center, the silicon steel coil to be processed automatically unfolds when the bearing turntable drives the silicon steel coil to be processed to rotate, thus creating gaps between each layer of silicon steel strips. This allows hot air to enter the gaps between the silicon steel strips during annealing, conducting heat and ensuring uniform heating of the silicon steel coil, thereby improving the quality of annealing.

Description

Technical Field

[0001] This invention relates to the field of annealing furnace equipment technology, specifically a high-temperature annealing ring furnace. Background Technology

[0002] Annealing is a heat treatment process in which a metal or alloy is heated to a suitable temperature, held at that temperature for a certain period of time, and then slowly cooled. During this process, the internal structure and properties of the metal or alloy change, thereby achieving specific process requirements.

[0003] Annealing of silicon steel coils is a common heat treatment process that improves the mechanical and magnetic properties of silicon steel through high-temperature heating and cooling. In traditional annealing furnaces, because the silicon steel coils are wound in coils, the furnace typically uses air for heat conduction during annealing. This results in the coil being heated from the surface inwards, creating a temperature difference between the inside and outside of the coil, ultimately affecting its performance and magnetic properties.

[0004] In view of this, the present invention proposes a high-temperature annealing ring furnace, which solves the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] A high-temperature annealing annular furnace includes a furnace body unit, the furnace body unit including an annular furnace body, the inner wall of the annular furnace body is provided with a plurality of heating wires for heating, the bottom of the annular furnace body is provided with an unfolding unit for unfolding silicon steel coils, the unfolding unit is provided with a stretching unit for assisting in unfolding the silicon steel coils, and the bottom of the annular furnace body is also provided with a circulation unit for circulating hot air.

[0007] The unfolding unit includes a bearing turntable, which is located at the bottom of the annular furnace body. A central shaft is fixedly connected to the lower end of the bearing turntable. The lower end of the central shaft slides through the bottom of the annular furnace body and is fixedly connected to a No. 1 motor. The No. 1 motor is fixedly connected to the bottom end of the annular furnace body.

[0008] The circulation unit includes fan blades, which are fixedly connected to the bottom of the annular furnace body. The fan blades are fixedly connected to the output shaft of the second motor, which is fixedly connected to the bottom end of the annular furnace body. The bearing turntable is provided with multiple guide holes for hot air to pass through.

[0009] As a preferred embodiment of the high-temperature annealing annular furnace provided by the present invention, the furnace body unit further includes an upper sealing plate, which is provided in pairs and symmetrically arranged. The upper sealing plate is fixedly connected to the output shaft of an electric telescopic rod at one end away from the axis of the annular furnace body, and the electric telescopic rod is fixedly connected to the outer wall of the annular furnace body.

[0010] As a preferred embodiment of the high-temperature annealing annular furnace provided by the present invention, a guide rail is provided above the annular furnace body, and a No. 1 gantry trolley for hoisting the silicon steel coil is provided on the guide rail.

[0011] As a preferred embodiment of the high-temperature annealing ring furnace provided by the present invention, the unfolding unit further includes an inner cover, on which a second gantry carriage is provided. The second gantry carriage is slidably connected to the guide rail. A fixing column is fixedly connected to the upper wall of the inner cover. Multiple openings are provided on the fixing column. A retaining strip is slidably connected in the opening. A retaining spring is fixedly connected to one end of the retaining strip near the axis of the fixing column. The other end of the retaining spring is fixedly connected to the fixing column.

[0012] As a preferred embodiment of the high-temperature annealing annular furnace provided by the present invention, a support frame is fixedly connected to the bottom of the annular furnace body, and the upper end of the support frame is rotatably connected to the bearing turntable.

[0013] As a preferred embodiment of the high-temperature annealing ring furnace provided by the present invention, the lower end of the inner cover is fixedly connected with a plurality of positioning columns, and the bottom of the ring furnace body is provided with a plurality of positioning holes, the positioning holes and the positioning columns cooperating with each other.

[0014] As a preferred embodiment of the high-temperature annealing annular furnace provided by the present invention, the stretching unit includes an arc-shaped guide port, and three arc-shaped guide ports are provided. The arc-shaped guide ports are all distributed on the bearing turntable. An abutment rod is abutted inside the arc-shaped guide port. A sliding block is fixedly connected to the upper end of the abutment rod, and a connecting rod is fixedly connected to the lower end of the abutment rod. One end of the connecting rod is rotatably connected to a hinge column, and the hinge column is fixedly connected to the bottom of the annular furnace body.

[0015] As a preferred embodiment of the high-temperature annealing ring furnace provided by the present invention, the bottom of the ring furnace body is also fixedly connected to an external gas guide pipe for introducing nitrogen, and the silicon steel coil to be processed is placed on the bearing turntable.

[0016] As a preferred embodiment of the high-temperature annealing ring furnace provided by the present invention, the upper wall of the inner cover is provided with an arc-shaped structure for guiding hot air.

[0017] As a preferred embodiment of the high-temperature annealing ring furnace provided by the present invention, the end of the sliding block away from the center of the bearing turntable is inclined.

[0018] The beneficial effects of this invention are:

[0019] In this invention, a No. 1 motor drives a bearing turntable to rotate via a central shaft. The bearing turntable then drives the silicon steel coil to be processed to rotate. Since the inner wall of the silicon steel coil to be processed is fixed at its center, the silicon steel coil to be processed will automatically spread out when the bearing turntable drives it to rotate. This creates gaps between each layer of silicon steel strips, allowing hot air to enter the gaps between the silicon steel strips during annealing for heat conduction. This results in uniform heating of the silicon steel coil, improving the quality of annealing. This invention solves the problem that in traditional silicon steel coils, during annealing, the temperature is transferred from the surface to the interior, leading to inconsistent temperatures between the outside and inside of the silicon steel coil, which adversely affects its performance and magnetic properties. At the same time, the bearing turntable squeezes the abutment rod through the arc-shaped guide opening, causing the abutment rod to slide away from the center of the bearing turntable when squeezed, thereby driving the sliding block to slide. When the sliding block slides, its upper end and the lower end of the silicon steel coil are in continuous contact, so that the sliding block can assist the silicon steel coil to expand outward, making the process of forming gaps between the silicon steel strips inside the silicon steel coil smoother, and further improving the quality of annealing. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] in:

[0022] Figure 1 This is a schematic diagram of the overall connection structure of a high-temperature annealing ring furnace;

[0023] Figure 2 This is a schematic diagram of the bottom connection structure of a high-temperature annealing ring furnace;

[0024] Figure 3 This is a schematic diagram of the internal connection structure of the annular furnace body in a high-temperature annealing annular furnace.

[0025] Figure 4 for Figure 3 Enlarged schematic diagram of the connection structure at point A in the middle;

[0026] Figure 5 A schematic diagram of the connection structure at the bottom of the annular furnace body in a high-temperature annealing annular furnace;

[0027] Figure 6 This is a schematic diagram of the connection structure between the annular furnace body and the unfolding unit in a high-temperature annealing annular furnace.

[0028] Figure 7 This is a schematic diagram showing the airflow direction during the annealing of silicon steel coils.

[0029] Figure 8 This is a schematic diagram of the internal connection structure of the inner shroud in a high-temperature annealing ring furnace.

[0030] In the picture:

[0031] 1. Furnace body unit; 11. Annular furnace body; 12. Upper sealing plate; 13. Electric telescopic rod; 14. Guide rail; 15. No. 1 gantry trolley; 16. Heating wire;

[0032] 2. Deployment unit; 21. Load-bearing turntable; 22. Central shaft; 23. Motor No. 1; 24. Inner cover; 25. Gantry carriage No. 2; 26. Positioning post; 27. Positioning hole; 28. Fixing post; 29. ​​Opening; 210. Clamping bar; 211. Clamping spring; 212. Support frame;

[0033] 3. Tensioning unit; 31. Arc-shaped guide opening; 32. Sliding block; 33. Linking rod; 34. Hinge column; 35. Abutment rod;

[0034] 4. Circulation unit; 41. Fan blades; 42. Motor No. 2; 43. Guide hole; 44. Arc-shaped structure;

[0035] 5. External air duct; 99. Silicon steel coil. Detailed Implementation

[0036] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0037] Example

[0038] like Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, a high-temperature annealing annular furnace includes a furnace body unit 1, which includes an annular furnace body 11. The inner wall of the annular furnace body 11 is provided with a plurality of heating wires 16 for heating. The bottom of the annular furnace body 11 is provided with an unfolding unit 2 for unfolding silicon steel coils 99. The unfolding unit 2 is provided with a stretching unit 3 for assisting in unfolding the silicon steel coils 99. The bottom of the annular furnace body 11 is also provided with a circulation unit 4 for circulating hot air.

[0039] The furnace body unit 1 also includes an upper sealing plate 12. There is a pair of upper sealing plates 12, which are symmetrically arranged. The output shaft of an electric telescopic rod 13 is fixedly connected to one end of the upper sealing plate 12 away from the axis of the annular furnace body 11. The electric telescopic rod 13 is fixedly connected to the outer wall of the annular furnace body 11.

[0040] A guide rail 14 is provided above the annular furnace body 11, and a No. 1 gantry trolley 15 for hoisting silicon steel coils 99 is provided on the guide rail 14.

[0041] The unfolding unit 2 includes a bearing turntable 21, which is located at the bottom of the annular furnace body 11. A central shaft 22 is fixedly connected to the lower end of the bearing turntable 21. The lower end of the central shaft 22 slides through the bottom of the annular furnace body 11 and is fixedly connected to a first motor 23. The first motor 23 is fixedly connected to the bottom of the annular furnace body 11.

[0042] The unfolding unit 2 also includes an inner cover 24, on which a second gantry carriage 25 is mounted. The second gantry carriage 25 is slidably connected to the guide rail 14. A fixing post 28 is fixedly connected to the upper wall of the inner cover 24. Multiple openings 29 are provided on the fixing post 28. A retaining strip 210 is slidably connected in the openings 29. A retaining spring 211 is fixedly connected to one end of the retaining strip 210 near the axis of the fixing post 28. The other end of the retaining spring 211 is fixedly connected to the fixing post 28.

[0043] A support frame 212 is fixedly connected to the bottom of the annular furnace body 11, and the upper end of the support frame 212 is rotatably connected to the bearing turntable 21.

[0044] In this embodiment, the user first operates the No. 1 gantry trolley 15 to hoist the silicon steel coil 99 to be processed (the gantry trolley is existing technology and will not be described in detail here). Then, the user operates the electric telescopic rod 13, which drives the two symmetrical upper sealing plates 12 to move. Then, the top of the annular furnace body 11 is opened. At this time, the user uses the No. 1 gantry trolley 15 to put the silicon steel coil 99 to be processed into the annular furnace body 11 and place it at the center of the bearing turntable 21. Then, the user operates the No. 1 gantry trolley 15 to leave the annular furnace body 11. Next, the user operates the No. 2 gantry trolley 25 to move the inner cover 24 to the top of the annular furnace body 11. Then, the user operates the No. 2 gantry trolley 25 to move the inner cover 24 into the annular furnace body 11. Then, the user operates the No. 2 gantry trolley 25 to move the inner cover 24 into the annular furnace body 11. Then, the positioning post 26 and the positioning hole 27 at the lower end of the inner cover 24 engage, so that the inside of the inner cover 24 is sealed.

[0045] It should be noted that during the downward movement of the inner cover 24, the fixing post 28 moves downward accordingly. First, the fixing post 28 extends into the central hole of the silicon steel coil 99 to be processed (the silicon steel coil 99 is wound and has a central hole). During this process, the protruding clamping strip 210 on the fixing post 28 contacts the wall of the central hole of the silicon steel coil 99, and simultaneously the clamping spring 211 contracts. As the fixing post 28 continues to move the clamping strip 210 downward, the clamping spring 211 continues to be compressed. Simultaneously, the extension force of the clamping spring 211 causes the clamping strip 210 to press tightly against the central hole of the silicon steel coil 99, thus fixing the center of the silicon steel coil 99 to be processed by the fixing post 28 and the clamping strip 210. Then, the electric telescopic rod 13 is activated again to drive the symmetrical upper sealing plate 12 to slide and close the upper end of the annular furnace body 11.

[0046] Then, motor 23 is started, which drives the central shaft 22 to rotate. The central shaft 22 drives the bearing turntable 21 to rotate, which in turn drives the silicon steel coil 99 to be processed to rotate (note the rotation direction of the bearing turntable 21, which is opposite to the winding direction of the silicon steel coil 99). Since the inner wall of the silicon steel coil 99 is fixed at the center, the silicon steel coil 99 will automatically spread out when the bearing turntable 21 drives it to rotate, so that there are gaps between each layer of silicon steel strips. This allows hot air to enter the gaps between the silicon steel strips during annealing, making the silicon steel coil 99 heat up evenly and improving the quality of annealing. This solves the problem that in traditional silicon steel coils 99, when heated, the temperature is transferred from the surface to the inside, resulting in inconsistent temperatures between the outside and inside of the silicon steel coil 99, which adversely affects the performance and magnetic properties of the silicon steel coil 99.

[0047] like Figure 3 , Figure 4 , Figure 5 Figure 6As shown, the stretching unit 3 includes an arc-shaped guide port 31. There are three arc-shaped guide ports 31, which are distributed on the bearing turntable 21. An abutment rod 35 is abutted inside the arc-shaped guide port 31. A sliding block 32 is fixedly connected to the upper end of the abutment rod 35, and a connecting rod 33 is fixedly connected to the lower end of the abutment rod 35. One end of the connecting rod 33 is rotatably connected to the hinge column 34, and the hinge column 34 is fixedly connected to the bottom of the annular furnace body 11.

[0048] In this embodiment, when the bearing turntable 21 rotates, it drives the arc-shaped guide port 31 to rotate. The rotation of the arc-shaped guide port 31 will squeeze the abutment rod 35. Since the lower end of the abutment rod 35 is rotatably connected to the hinge column 34 by the connecting rod 33 and the hinge column 34 is fixed to the bottom of the annular furnace body 11, when the abutment rod 35 is squeezed, it will slide along the arc-shaped guide port 31 away from the center of the bearing turntable 21, thereby driving the sliding block 32 to slide. When the sliding block 32 slides, its upper end is in continuous contact with the lower end of the silicon steel coil 99, thereby driving the silicon steel coil 99 to expand outward. Since the rotation of the bearing turntable 21 has already caused the silicon steel coil 99 to loosen and expand outward, the sliding block 32 can assist the silicon steel coil 99 to expand outward, making the process of forming gaps between the silicon steel strips in the silicon steel coil 99 smoother and further improving the quality of annealing.

[0049] Furthermore, the end of the sliding block 32 furthest from the center of the bearing turntable 21 is inclined. Because gaps will form between the silicon steel strips after the silicon steel coil 99 expands and loosens outwards, when the inclined end of the sliding block 32 slides over the bottom of the silicon steel strip, it will scoop up the silicon steel strip. Then, the sliding block 32 continues to move. Due to the friction between the upper end of the sliding block 32 and the lower end of the silicon steel strip, the sliding block 32 will drive the silicon steel strip outwards a certain distance (effectively expanding the silicon steel coil 99 outwards, creating gaps between the silicon steel strips). Simultaneously, the silicon steel strip will be subjected to tension at the center. Finally, the silicon steel strip will leave the upper end of the sliding block 32. Then, the sliding block 32 continues to slide, driving the outer ring of silicon steel strips outwards, thus making the gaps between each ring of silicon steel strips uniform. This ensures that the volume of hot air within the gaps is as equal as possible, resulting in uniform heating during annealing and improved annealing quality.

[0050] like Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the circulation unit 4 includes a fan blade 41, which is fixedly connected to the bottom of the annular furnace body 11. The fan blade 41 is fixedly connected to the output shaft of the second motor 42, which is fixedly connected to the bottom end of the annular furnace body 11. The bearing turntable 21 is provided with multiple guide holes 43 for hot air to pass through.

[0051] The upper wall of the inner cover 24 is provided with an arc-shaped structure 44 for guiding hot air.

[0052] In this embodiment, the annular furnace body 11 is heated by heating wire 16 to reach and maintain the annealing temperature. During this period, the fan blade 41 is driven by starting motor 42. The fan blade 41 blows hot air into the gap of the loosened silicon steel coil 99 through the guide hole 43. Then, after the hot air comes into contact with the arc-shaped structure 44, it is guided by the arc-shaped structure 44 and then drawn back into the fan blade 41 and blown out, so that the hot air forms a circulation. This ensures that there is always hot air flowing through the gap of the silicon steel coil 99, which improves the uniformity of heating of the silicon steel coil 99, reduces the temperature difference during annealing, and improves the annealing quality.

[0053] like Figure 2 , Figure 5 , Figure 6 and Figure 7 As shown, an external gas pipe 5 for introducing nitrogen is fixedly connected to the bottom of the annular furnace body 11, and a silicon steel coil 99 to be processed is placed on the bearing turntable 21.

[0054] In this embodiment, nitrogen gas is introduced into the inner cover 24 through the external gas pipe 5 to prevent oxidation of the silicon steel coil 99 during return and to improve the annealing quality.

[0055] The workflow is as follows:

[0056] First, the user operates the No. 1 gantry trolley 15 to hoist the silicon steel coil 99 to be processed. Then, the user operates the electric telescopic rod 13 to move the two symmetrical upper sealing plates 12, so that the top of the annular furnace body 11 is opened. At this time, the user uses the No. 1 gantry trolley 15 to put the silicon steel coil 99 to be processed into the annular furnace body 11 and place it at the center of the bearing turntable 21. Then, the user operates the No. 1 gantry trolley 15 to leave the annular furnace body 11. Next, the user operates the No. 2 gantry trolley 25 to move the inner cover 24 to the top of the annular furnace body 11. Then, the user operates the No. 2 gantry trolley 25 to move the inner cover 24 into the annular furnace body 11. Then, the user operates the No. 2 gantry trolley 25 to move the inner cover 24 into the annular furnace body 11. Then, the positioning post 26 and the positioning hole 27 at the lower end of the inner cover 24 engage, so that the inside of the inner cover 24 is sealed. As the inner cover 24 moves downward, it causes the fixing post 28 to extend into the central hole of the silicon steel coil 99 to be processed. During this process, the protruding clamping strip 210 on the fixing post 28 contacts the hole wall of the central hole of the silicon steel coil 99. As the fixing post 28 continues to move the clamping strip 210 downward, the clamping spring 211 continues to be compressed. At the same time, the extension force of the clamping spring 211 causes the clamping strip 210 to press tightly against the central hole of the silicon steel coil 99, thus fixing the center of the silicon steel coil 99 to be processed by the fixing post 28 and the clamping strip 210. Then, the electric telescopic rod 13 is activated again to drive the symmetrical upper sealing plate 12 to slide and close the upper end of the annular furnace body 11. Then, motor 23 is started, which drives the central shaft 22 to rotate. The central shaft 22 drives the bearing turntable 21 to rotate, which in turn drives the silicon steel coil 99 to be processed to rotate. Since the inner wall of the center of the silicon steel coil 99 to be processed is fixed, the silicon steel coil 99 to be processed will automatically spread out when the bearing turntable 21 drives it to rotate, so that there are gaps between each layer of silicon steel strips. This allows hot air to enter the gaps between the silicon steel strips to conduct heat during annealing, making the silicon steel coil 99 heat up evenly and improving the quality of annealing. When the bearing turntable 21 rotates, it drives the arc-shaped guide port 31 to rotate. The rotation of the arc-shaped guide port 31 will squeeze the abutment rod 35. Because the lower end of the abutment rod 35 is rotatably connected to the hinge column 34 by the connecting rod 33, and the hinge column 34 is fixed to the bottom of the annular furnace body 11, the abutment rod 35 will slide along the arc-shaped guide port 31 away from the center of the bearing turntable 21 when it is squeezed, thereby driving the sliding block 32 to slide. When the sliding block 32 slides, its upper end is in continuous contact with the lower end of the silicon steel coil 99, thereby driving the silicon steel coil 99 to expand outward. Because the rotation of the bearing turntable 21 has already caused the silicon steel coil 99 to loosen and expand outward, the sliding block 32 can assist the silicon steel coil 99 to expand outward, making the process of forming gaps between the silicon steel strips in the silicon steel coil 99 smoother and further improving the quality of annealing.Nitrogen gas is introduced into the inner cover 24 through the external gas pipe 5 to prevent oxidation of the silicon steel coil 99 during annealing. Then, the heating wire 16 heats the ring furnace body 11 to reach the annealing temperature and maintain it for annealing. During this period, the second motor 42 is started to drive the fan blades 41. The fan blades 41 blow hot air into the gaps of the loosened silicon steel coil 99 through the guide hole 43. After the hot air comes into contact with the arc-shaped structure 44, it is guided by the arc-shaped structure 44 and then drawn back into the fan blades 41 and blown out, so that the hot air forms a circulation. This ensures that hot air always flows through the gaps of the silicon steel coil 99, which improves the uniformity of heating of the silicon steel coil 99, reduces the temperature difference during annealing, and improves the annealing quality.

[0057] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0058] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-temperature annealing annular furnace, comprising a furnace body unit (1), characterized in that, The furnace body unit (1) includes an annular furnace body (11), the inner wall of the annular furnace body (11) is provided with a plurality of heating wires (16) for heating, the bottom of the annular furnace body (11) is provided with an unfolding unit (2) for unfolding silicon steel coil (99), the unfolding unit (2) is provided with a stretching unit (3) for assisting in unfolding the silicon steel coil (99), and the bottom of the annular furnace body (11) is also provided with a circulation unit (4) for circulating hot air. The unfolding unit (2) includes a bearing turntable (21), which is located at the bottom of the annular furnace body (11). The lower end of the bearing turntable (21) is fixedly connected to a central shaft (22). The lower end of the central shaft (22) slides through the bottom of the annular furnace body (11) and is fixedly connected to a first motor (23). The first motor (23) is fixedly connected to the bottom end of the annular furnace body (11). The circulation unit (4) includes a fan blade (41), which is fixedly connected to the bottom of the annular furnace body (11). The fan blade (41) is fixedly connected to the output shaft of the second motor (42), which is fixedly connected to the bottom end of the annular furnace body (11). The bearing turntable (21) is provided with multiple guide holes (43) through which hot air can pass. The furnace body unit (1) also includes an upper sealing plate (12), which is provided in pairs and symmetrically arranged. The upper sealing plate (12) is fixedly connected to the output shaft of an electric telescopic rod (13) at one end away from the axis of the annular furnace body (11). The electric telescopic rod (13) is fixedly connected to the outer wall of the annular furnace body (11). The annular furnace body (11) is provided with a guide rail (14) above it, and a No. 1 gantry trolley (15) for hoisting the silicon steel coil (99) is provided on the guide rail (14). The unfolding unit (2) also includes an inner cover (24), on which a second gantry carriage (25) is provided. The second gantry carriage (25) is slidably connected to the guide rail (14). A fixing column (28) is fixedly connected to the upper wall of the inner cover (24). Multiple openings (29) are provided on the fixing column (28). A retaining strip (210) is slidably connected in the opening (29). A retaining spring (211) is fixedly connected to one end of the retaining strip (210) near the axis of the fixing column (28). The other end of the retaining spring (211) is fixedly connected to the fixing column (28). The stretching unit (3) includes an arc-shaped guide port (31), and there are three arc-shaped guide ports (31). The arc-shaped guide ports (31) are all distributed on the bearing turntable (21). An abutting rod (35) is abutted inside the arc-shaped guide port (31). A sliding block (32) is fixedly connected to the upper end of the abutting rod (35). A connecting rod (33) is fixedly connected to the lower end of the abutting rod (35). One end of the connecting rod (33) is rotatably connected to the hinge column (34). The hinge column (34) is fixedly connected to the bottom of the annular furnace body (11).

2. The high-temperature annealing ring furnace as described in claim 1, characterized in that, The bottom of the annular furnace body (11) is fixedly connected to a support frame (212), and the upper end of the support frame (212) is rotatably connected to the bearing turntable (21).

3. The high-temperature annealing ring furnace as described in claim 1, characterized in that, The lower end of the inner cover (24) is fixedly connected with multiple positioning posts (26), and the bottom of the annular furnace body (11) is provided with multiple positioning holes (27), which are matched with the positioning posts (26).

4. The high-temperature annealing ring furnace as described in claim 3, characterized in that, The bottom of the annular furnace body (11) is also fixedly connected to an external gas pipe (5) for introducing nitrogen, and the silicon steel coil (99) to be processed is placed on the bearing turntable (21).

5. The high-temperature annealing ring furnace as described in claim 3, characterized in that, The upper wall of the inner cover (24) is provided with an arc-shaped structure (44) for guiding hot air.

6. The high-temperature annealing ring furnace as described in claim 3, characterized in that, The sliding block (32) is inclined at one end away from the center of the bearing turntable (21).

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