High-temperature annealing annular furnace

Abstract

The invention relates to the technical field of annealing furnace equipment, in particular to a high-temperature annealing annular furnace which comprises a furnace body unit, the furnace body unit comprises an annular furnace body, a plurality of heating wires used for heating are arranged on the inner wall of the annular furnace body, and an unfolding unit used for unfolding a silicon steel coil is arranged at the bottom of the annular furnace body. A stretching unit used for assisting in unfolding the silicon steel coil is arranged on the unfolding unit, and a circulating unit used for circulating hot air is further arranged at the bottom of the annular furnace body. The first motor drives the bearing rotating disc to rotate through the center shaft, the bearing rotating disc drives the silicon steel coil to be machined to rotate, and due to the fact that the inner wall of the center of the silicon steel coil to be machined is fixed, when the bearing rotating disc drives the silicon steel coil to be machined to rotate, the silicon steel coil to be machined can be automatically scattered, and therefore gaps are formed between silicon steel strips on each layer; and during annealing, hot air can enter gaps between the silicon steel strips for heat conduction, so that silicon steel coils are uniformly heated, and the annealing quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of annealing furnace equipment, in particular to a high-temperature annealing ring furnace. Background Art

[0002] Annealing is a heat treatment process in which a metal or alloy is heated to an appropriate temperature, kept 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 will change, thereby achieving specific process requirements.

[0003] Annealing of silicon steel coil is a common heat treatment process, which improves the mechanical properties and magnetic properties of silicon steel by high-temperature heating and cooling. When the traditional annealing furnace returns silicon steel coils, because the silicon steel coils are wound up in circles, during annealing, the annealing furnace generally uses air for heat conduction, which causes the silicon steel coils to be heated from the surface to the inside, which causes a temperature difference between the inside and outside of the silicon steel coil, and ultimately affects the performance and magnetic properties of the silicon steel coil.

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

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] A high-temperature annealing annular furnace, comprising a furnace body unit, wherein the furnace body unit comprises an annular furnace body, a plurality of heating wires for heating are arranged on the inner wall of the annular furnace body, an unfolding unit for unfolding a silicon steel coil is arranged at the bottom of the annular furnace body, a stretching unit for assisting in unfolding the silicon steel coil is arranged on the unfolding unit, and a circulation unit for circulating hot air is also arranged at the bottom of the annular furnace body;

[0007] Wherein, the unfolding unit comprises a bearing turntable, the bearing turntable is arranged at the bottom of the annular furnace body, the lower end of the bearing turntable is fixedly connected with a central shaft, 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, and 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 No. 2 motor, which is fixedly connected to the bottom end of the annular furnace body. The supporting turntable is provided with a plurality of guide holes for hot air to pass through.

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

[0010] As a preferred solution 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 carriage for hoisting the silicon steel coil is provided on the guide rail.

[0011] As a preferred solution of the high-temperature annealing annular furnace provided in the present invention, the unfolding unit also includes an inner cover, a No. 2 gantry sports car is provided on the inner cover, the No. 2 gantry sports car is slidably connected to the guide rail, a fixing column is fixedly connected to the upper wall of the inner cover, a plurality of openings are provided on the fixing column, a tightening strip is slidably connected in the opening, one end of the tightening strip close to the axis of the fixing column is fixedly connected to a tightening spring, and the other end of the tightening spring is fixedly connected to the fixing column.

[0012] As a preferred solution 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 carrying turntable.

[0013] As a preferred solution of the high temperature annealing annular furnace provided by the present invention, a plurality of positioning columns are fixedly connected to the lower end of the inner cover, a plurality of positioning holes are opened at the bottom of the annular furnace body, and the positioning holes and the positioning columns cooperate with each other.

[0014] As a preferred solution of the high-temperature annealing annular furnace provided by the present invention, the stretching unit includes an arc-shaped guide opening, three of which are provided and are all distributed on the carrying turntable, an abutment rod is abutted in the arc-shaped guide opening, a sliding block is fixedly connected to the upper end of the abutment rod, 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 solution of the high temperature annealing annular furnace provided by the present invention, the bottom of the annular furnace body is also fixedly connected to an external air guide pipe for introducing nitrogen, and the silicon steel coil to be processed is placed on the carrying turntable.

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

[0017] As a preferred solution of the high temperature annealing annular furnace provided by the present invention, one end of the sliding block away from the center of the supporting turntable is inclined.

[0018] Beneficial effects of the present invention:

[0019] In the present invention, the No. 1 motor drives the bearing turntable to rotate through the central axis, and the bearing turntable drives the silicon steel coil to be processed to rotate. Since the inner wall at the center of the silicon steel coil to be processed is fixed, when the bearing turntable drives the silicon steel coil to be processed to rotate, the silicon steel coil to be processed will automatically spread out, so that there is a gap between each layer of silicon steel bars, so that during annealing, hot air can enter the gap between the silicon steel bars for heat conduction, so that the silicon steel coil is heated evenly, the annealing quality is improved, and the problem of the traditional silicon steel coil being inconsistent in temperature between the outside and inside of the silicon steel coil due to the temperature transfer from the surface to the inside when the silicon steel coil is heated, which has an adverse effect on the performance and magnetic properties of the silicon steel coil, is solved. At the same time, the bearing turntable squeezes the abutment rod through the arc-shaped guide opening, so that when the abutment rod is squeezed, it will slide along the arc-shaped guide opening away from the center of the bearing turntable, thereby driving the sliding block to slide. When the sliding block slides, its upper end is in continuous contact with the lower end of the silicon steel coil, so that the sliding of the sliding block can assist the silicon steel coil in expanding outward, making the process of forming gaps between the silicon steel strips in the silicon steel coil smoother, further improving the quality of annealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[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 annular furnace;

[0024] Figure 3 A schematic diagram of the connection structure inside a ring-shaped furnace body in a high-temperature annealing ring-shaped furnace;

[0025] Figure 4 for Figure 3 A magnified schematic diagram of the connection structure at center A;

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

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

[0028] Figure 7 This is a schematic diagram of the air flow direction during annealing of silicon steel coil;

[0029] Figure 8 A schematic diagram of the connection structure inside the inner cover of a high-temperature annealing annular furnace;

[0030] In the figure:

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

[0032] 2. unfolding unit; 21. bearing turntable; 22. central axis; 23. No. 1 motor; 24. inner cover; 25. No. 2 gantry carriage; 26. positioning column; 27. positioning hole; 28. fixing column; 29. ​​opening; 210. tightening strip; 211. tightening spring; 212. support frame;

[0033] 3. stretching unit; 31. arc-shaped guide opening; 32. sliding block; 33. connecting rod; 34. hinge column; 35. abutting rod;

[0034] 4. Circulation unit; 41. Fan blade; 42. No. 2 motor; 43. Guide hole; 44. Arc structure;

[0035] 5. External air duct; 99. Silicon steel coil. DETAILED DESCRIPTION

[0036] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below 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.

[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 comprises a furnace body unit 1, the furnace body unit 1 comprises an annular furnace body 11, a plurality of heating wires 16 for heating are arranged on the inner wall of the annular furnace body 11, an unrolling unit 2 for unrolling a silicon steel coil 99 is arranged at the bottom of the annular furnace body 11, a stretching unit 3 for assisting in unrolling the silicon steel coil 99 is arranged on the unrolling unit 2, and a circulation unit 4 for circulating hot air is also arranged at the bottom of the annular furnace body 11;

[0039] The furnace unit 1 further includes an upper sealing plate 12, which is provided in pair and symmetrically arranged, and one end of the upper sealing plate 12 away from the axis of the annular furnace body 11 is fixedly connected to the output shaft of the electric telescopic rod 13, and 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 carriage 15 for hoisting the silicon steel coil 99 is provided on the guide rail 14;

[0041] The unfolding unit 2 includes a carrying turntable 21, which is disposed at the bottom of the annular furnace body 11. A central shaft 22 is fixedly connected to the lower end of the carrying 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 No. 1 motor 23. The No. 1 motor 23 is fixedly connected to the bottom end of the annular furnace body 11.

[0042] The unfolding unit 2 further comprises an inner cover 24, on which a second gantry carriage 25 is provided, which is slidably connected to the guide rail 14, and a fixing column 28 is fixedly connected to the upper wall of the inner cover 24, and a plurality of openings 29 are provided on the fixing column 28, and a tightening strip 210 is slidably connected in the opening 29, and one end of the tightening strip 210 close to the axis of the fixing column 28 is fixedly connected to a tightening spring 211, and the other end of the tightening spring 211 is fixedly connected to the fixing column 28;

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

[0044] In this embodiment, first, the user operates the No. 1 gantry sports car 15 to work, and the No. 1 gantry sports car 15 hoists the silicon steel coil 99 to be processed (the gantry sports car is a prior art and will not be described in detail here), and then operates the electric telescopic rod 13 to work, and the electric telescopic rod 13 drives the two symmetrical upper sealing plates 12 to move, and then the top of the annular furnace body 11 is opened. At this time, the user uses the No. 1 gantry sports car 15 to put the silicon steel coil 99 to be processed into the annular furnace body 11 and locate it at the center of the carrying turntable 21, and then operates the No. 1 gantry sports car 15 to leave the annular furnace body 11, and then operates the No. 2 gantry sports car 25 to drive the inner cover 24 to move above the annular furnace body 11, and then operates the No. 2 gantry sports car 25 to drive the inner cover 24 to move into the annular furnace body 11, and then the positioning column 26 and the positioning hole 27 at the lower end of the inner cover 24 are engaged, 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 fixed column 28 moves downward with it. First, the fixed column 28 extends into the center hole of the silicon steel coil 99 to be processed (the silicon steel coil 99 is wound and has a round hole in the middle). During this process, the protruding clamping strip 210 on the fixed column 28 contacts the hole wall of the center hole of the silicon steel coil 99 to be processed, and the clamping spring 211 contracts. When the fixed column 28 drives the clamping strip 210 to continue to move downward, the clamping spring 211 continues to be compressed. At the same time, the extension force of the clamping spring 211 makes the clamping strip 210 close to the center hole of the silicon steel coil 99 to be processed, so that the center of the silicon steel coil 99 to be processed is fixed by the fixed column 28 and the clamping strip 210. Then, the electric telescopic rod 13 is started again to drive the symmetrical upper sealing plate 12 to slide and close the upper end of the annular furnace body 11.

[0046] Then, the No. 1 motor 23 is started, and the No. 1 motor 23 drives the central shaft 22 to rotate, and the central shaft 22 drives the supporting turntable 21 to rotate, and the supporting turntable 21 drives the silicon steel coil 99 to be processed to rotate (it is necessary to pay attention to the rotation direction of the supporting turntable 21 here, and the rotation direction is opposite to the winding direction of the silicon steel coil 99 to be processed). Since the inner wall at the center of the silicon steel coil 99 to be processed is fixed, when the supporting turntable 21 drives the silicon steel coil 99 to be processed to rotate, the silicon steel coil 99 to be processed will automatically spread out, so that there is a gap between each layer of silicon steel bars, so that during annealing, hot air can enter the gap between the silicon steel bars for heat conduction, so that the silicon steel coil 99 is heated evenly, and the quality of annealing is improved, which solves the problem that when the traditional silicon steel coil 99 is annealed, the temperature of the silicon steel coil 99 is transferred from the surface to the inside when the silicon steel coil 99 is heated, resulting in inconsistent temperatures between the outside and inside of the silicon steel coil 99, which has an adverse effect on 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 opening 31, and three arc-shaped guide openings 31 are provided, and the arc-shaped guide openings 31 are evenly distributed on the supporting turntable 21. An abutment rod 35 is abutted in the arc-shaped guide opening 31, and the upper end of the abutment rod 35 is fixedly connected to a sliding block 32, and the lower end of the abutment rod 35 is fixedly connected to a connecting rod 33, and one end of the connecting rod 33 is rotatably connected to a 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 carrying turntable 21 rotates, the carrying turntable 21 drives the arc-shaped guide opening 31 to rotate, and the rotation of the arc-shaped guide opening 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, so when the abutment rod 35 is squeezed, it will slide along the arc-shaped guide opening 31 away from the center of the carrying turntable 21, thereby driving the sliding block 32 to slide. When the sliding block 32 slides, its upper end and the lower end of the silicon steel coil 99 are continuously in contact, thereby driving the silicon steel coil 99 to expand outward, because when the carrying turntable 21 rotates, the silicon steel coil 99 has been loosened and expanded outward, and the sliding of the sliding block 32 can assist the silicon steel coil 99 to expand outward, so that the process of forming a gap between the silicon steel strips in the silicon steel coil 99 is smoother, further improving the quality of annealing.

[0049] Furthermore, one end of the sliding block 32 away from the center of the bearing turntable 21 is inclined. Because there will be gaps between the silicon steel strips after the silicon steel coil 99 is expanded outward and loosened, when the inclined end of the sliding block 32 slides over the bottom of the silicon steel strip, the inclined end of the sliding block 32 will scoop up the silicon steel strip, and 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 to move outward for a distance (playing the role of expanding the silicon steel coil 99 outward, forming a gap between the silicon steel strips), and at the same time, the silicon steel strip will be subjected to tension at the center, and finally the silicon steel strip will leave the upper end of the sliding block 32, and then the sliding block 32 continues to slide, driving the outer circle of silicon steel strips to expand outward, so that the gaps between each circle of silicon steel strips are uniform, so that the volume of hot air in the gap is as equal as possible, so that the heat is uniform during annealing, and the annealing quality is improved.

[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, and the fan blade 41 is fixedly connected to the output shaft of the second motor 42, and the second motor 42 is fixedly connected to the bottom end of the annular furnace body 11. The carrying turntable 21 is provided with a plurality of 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 heating wire 16 is used to heat the annular furnace body 11 so that the annealing temperature is reached and maintained. During this period, the fan blades 41 are driven to work by starting the second motor 42. The fan blades 41 blow hot air into the gaps of the loosened silicon steel coils 99 through the guide holes 43. After the hot air contacts the arc structure 44, it is guided by the arc structure 44 and sucked away by the fan blades 41 and blown out again, so that the hot air forms a circulation, so that hot air always flows through the gaps of the silicon steel coils 99, thereby improving the uniformity of the heating of the silicon steel coils 99, reducing the temperature difference during the annealing of the silicon steel coils 99, and improving the annealing quality.

[0053] like Figure 2 , Figure 5 , Figure 6 and Figure 7 As shown, an external air guide 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 carrying turntable 21 .

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

[0055] The workflow is as follows:

[0056] First, the user operates the No. 1 gantry sports car 15 to work, and the No. 1 gantry sports car 15 hoists the silicon steel coil 99 to be processed, and then operates the electric telescopic rod 13 to drive the two symmetrical upper sealing plates 12 to move, so that the top of the annular furnace body 11 is opened. At this time, the user uses the No. 1 gantry sports car 15 to put the silicon steel coil 99 to be processed into the annular furnace body 11 and locate it at the center of the carrying turntable 21, and then operates the No. 1 gantry sports car 15 to leave the annular furnace body 11, and then operates the No. 2 gantry sports car 25 to drive the inner cover 24 to move to the top of the annular furnace body 11, and then operates the No. 2 gantry sports car 25 to drive the inner cover 24 to move into the annular furnace body 11, and then the positioning column 26 and the positioning hole 27 at the lower end of the inner cover 24 are engaged, so that the inside of the inner cover 24 is sealed. During the downward movement of the inner cover 24, the fixed column 28 is driven to extend into the center hole of the silicon steel coil 99 to be processed. During this process, the protruding abutting strip 210 on the fixed column 28 contacts the hole wall of the center hole of the silicon steel coil 99 to be processed. When the fixed column 28 drives the abutting strip 210 to continue to move downward, the abutting spring 211 continues to be compressed. At the same time, the extension force of the abutting spring 211 makes the abutting strip 210 close to the center hole of the silicon steel coil 99 to be processed, so that the center of the silicon steel coil 99 to be processed is fixed by the fixed column 28 and the abutting strip 210. Then, the electric telescopic rod 13 is started again to drive the symmetrical upper sealing plate 12 to slide and close the upper end of the annular furnace body 11. Then, motor No. 1 23 is started, and motor No. 1 23 drives the central shaft 22 to rotate, and the central shaft 22 drives the supporting turntable 21 to rotate, and the supporting turntable 21 drives the silicon steel coil 99 to be processed to rotate. Since the inner wall at the center of the silicon steel coil 99 to be processed is fixed, when the supporting turntable 21 drives the silicon steel coil 99 to be processed to rotate, the silicon steel coil 99 to be processed will automatically spread out, so that there is a gap between each layer of silicon steel bars, so that during annealing, hot air can enter the gap between the silicon steel bars to conduct heat, so that the silicon steel coil 99 is heated evenly, thereby improving the quality of annealing. When the carrying turntable 21 rotates, the carrying turntable 21 drives the arc-shaped guide opening 31 to rotate, and the rotation of the arc-shaped guide opening 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, so the abutment rod 35 will slide along the arc-shaped guide opening 31 away from the center of the carrying turntable 21 when squeezed, thereby driving the sliding block 32 to slide, and when the sliding block 32 slides, its upper end and the lower end of the silicon steel coil 99 are continuously in contact, thereby driving the silicon steel coil 99 to expand outward, because when the carrying turntable 21 rotates, the silicon steel coil 99 has been loosened and expanded outward, and the sliding of the sliding block 32 can assist the silicon steel coil 99 to expand outward, so that the process of forming a gap between the silicon steel strips in the silicon steel coil 99 is smoother, further improving the quality of annealing.Nitrogen is introduced into the inner cover 24 through the external air guide pipe 5 to prevent the silicon steel coil 99 from being oxidized when returned. Then, the heating wire 16 is used to heat the annular furnace body 11 so that the annealing temperature is reached and maintained for annealing. During this period, the fan blades 41 are driven to work by starting the No. 2 motor 42. The fan blades 41 blow hot air into the gaps of the loosened silicon steel coils 99 through the guide holes 43. After the hot air contacts the arc structure 44, it is guided by the arc structure 44 and sucked away by the fan blades 41 and blown out again, so that the hot air forms a circulation, so that hot air always flows through the gaps of the silicon steel coils 99, thereby improving the uniformity of the heating of the silicon steel coils 99, reducing the temperature difference of the silicon steel coils 99 during annealing, and improving the annealing quality.

[0057] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0058] The above shows and describes 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 above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high temperature annealing annular furnace, comprising a furnace unit (1), characterized in that: The furnace body unit (1) comprises an annular furnace body (11), a plurality of heating wires (16) for heating are arranged on the inner wall of the annular furnace body (11), an unfolding unit (2) for unfolding a silicon steel coil (99) is arranged at the bottom of the annular furnace body (11), a stretching unit (3) for assisting in unfolding the silicon steel coil (99) is arranged on the unfolding unit (2), and a circulation unit (4) for circulating hot air is also arranged at the bottom of the annular furnace body (11); The unfolding unit (2) comprises a carrying turntable (21), the carrying turntable (21) is arranged at the bottom of the annular furnace body (11), the lower end of the carrying 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), and the first motor (23) is fixedly connected to the bottom end of the annular furnace body (11); The circulation unit (4) comprises a fan blade (41), wherein the fan blade (41) is fixedly connected to the bottom of the annular furnace body (11), the fan blade (41) is fixedly connected to the output shaft of a second motor (42), and the second motor (42) is fixedly connected to the bottom end of the annular furnace body (11), and the supporting turntable (21) is provided with a plurality of guide holes (43) for hot air to pass through.

2. The high temperature annealing ring furnace as claimed in claim 1, characterized in that: The furnace body unit (1) further comprises an upper sealing plate (12), a pair of the upper sealing plates (12) being provided and symmetrically arranged, one end of the upper sealing plate (12) away from the axis of the annular furnace body (11) being fixedly connected to the output shaft of an electric telescopic rod (13), and the electric telescopic rod (13) being fixedly connected to the outer wall of the annular furnace body (11).

3. The high temperature annealing ring furnace as claimed in claim 2, characterized in that: A guide rail (14) is provided above the annular furnace body (11), and a No. 1 gantry carriage (15) for hoisting the silicon steel coil (99) is provided on the guide rail (14).

4. The high temperature annealing ring furnace as claimed in claim 3, characterized in that: The unfolding unit (2) further comprises an inner cover (24), a second gantry carriage (25) being provided on the inner cover (24), the second gantry carriage (25) being slidably connected to the guide rail (14), a fixing column (28) being fixedly connected to the upper wall of the inner cover (24), a plurality of openings (29) being provided on the fixing column (28), a tightening strip (210) being slidably connected in the opening (29), a tightening strip (210) being fixedly connected to one end of the tightening strip (210) close to the axis of the fixing column (28), and the other end of the tightening spring (211) being fixedly connected to the fixing column (28).

5. The high temperature annealing ring furnace as claimed in claim 4, characterized in that: A support frame (212) is fixedly connected to the bottom of the annular furnace body (11), and an upper end of the support frame (212) is rotatably connected to the supporting turntable (21).

6. The high temperature annealing ring furnace as claimed in claim 5, characterized in that: A plurality of positioning columns (26) are fixedly connected to the lower end of the inner cover (24), and a plurality of positioning holes (27) are provided at the bottom of the annular furnace body (11), wherein the positioning holes (27) and the positioning columns (26) are matched with each other.

7. The high temperature annealing ring furnace as claimed in claim 6, characterized in that: The stretching unit (3) comprises an arc-shaped guide opening (31), wherein three arc-shaped guide openings (31) are provided and are all distributed on the carrying turntable (21), wherein an abutment rod (35) is abutted in the arc-shaped guide opening (31), wherein the upper end of the abutment rod (35) is fixedly connected to a sliding block (32), and the lower end of the abutment rod (35) is fixedly connected to a connecting rod (33), wherein one end of the connecting rod (33) is rotatably connected to a hinge column (34), and the hinge column (34) is fixedly connected to the bottom of the annular furnace body (11).

8. The high temperature annealing ring furnace as claimed in claim 7, characterized in that: An external air guide pipe (5) for introducing nitrogen is also fixedly connected to the bottom of the annular furnace body (11), and the silicon steel coil (99) to be processed is placed on the carrying turntable (21).

9. The high temperature annealing ring furnace as claimed in claim 6, characterized in that: The upper wall of the inner cover (24) is provided with an arc-shaped structure (44) for guiding hot air.

10. The high temperature annealing ring furnace as claimed in claim 7, characterized in that: One end of the sliding block (32) away from the center of the carrying turntable (21) is arranged in an inclined manner.

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