Inert gas annealing furnace and process method thereof

Abstract

The annealing furnace comprises a furnace body, a furnace door, a lifting mechanism and heaters, the furnace door is arranged on one side of the furnace body through the lifting mechanism, the heaters are evenly distributed in the furnace body, the annealing furnace is characterized in that the bottom of the furnace body is formed by welding I-shaped steel, rail steel is welded to the top of the I-shaped steel, and the rail steel is welded to the bottom of the furnace body. Inert gas inlet pipes are distributed on the two sides in a hearth of the furnace body, a cooling box is arranged on the side, away from the furnace door, of the furnace body and used for rapidly cooling high-temperature gas in the hearth, and a sealing assembly is arranged between the furnace body and the furnace door and used for sealing the furnace door. According to the annealing furnace, the furnace body, the inert gas inlet pipe, the colossal cooling box and the sealing assembly are matched with one another, so that the sealing performance of the hearth is guaranteed when alloy metal materials are annealed, accurate control over the oxygen content in the hearth is achieved, and therefore the heat treatment requirement for the alloy metal materials is met.

Description

Inert gas annealing furnace and its process Technical Field

[0001] This invention relates to an inert gas annealing furnace and its process. Background Technology

[0002] Annealing is a common process in materials processing. To achieve certain properties, such as reducing the hardness of a metal and increasing its plasticity, the metal needs to be heated, held for a period of time, and then slowly cooled to obtain that property. However, some alloy metals oxidize during high-temperature annealing, causing the tensile strength, ductility, and gloss of the product to fail to meet manufacturing requirements. These metal materials are often used in high-end or high-value-added products, offering significant economic benefits, such as in new energy power batteries and aerospace. Annealing furnaces are indispensable processing equipment in annealing. Most existing domestically produced annealing furnaces cannot guarantee the sealing of the furnace chamber during annealing, making it impossible to accurately control the oxygen content within the furnace, thus failing to meet the heat treatment requirements of the corresponding metal materials. Therefore, manufacturers often imported foreign annealing furnaces for the heat treatment of related metal materials. This resulted in high production costs, long procurement cycles, and low production efficiency, hindering rapid production. Summary of the Invention

[0003] 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.

[0004] The technical problem to be solved by this invention is that most existing domestic annealing furnaces cannot guarantee the sealing of the furnace chamber when annealing alloy metal materials, resulting in the inability to accurately control the oxygen content in the furnace chamber, and thus failing to meet the heat treatment requirements of alloy metal materials.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an inert gas annealing furnace, comprising a furnace body, a furnace door, a lifting mechanism, and a heater. The furnace door is disposed on one side of the furnace body via the lifting mechanism. The heaters are evenly distributed within the furnace body. The bottom of the furnace body is welded from I-beams, and a rail is welded to the top of the I-beams. Inert gas inlet pipes are distributed on both sides of the furnace chamber. A large cooling box is disposed on the side of the furnace body away from the furnace door for rapid cooling of the high-temperature gas in the furnace chamber. A sealing assembly is disposed between the furnace body and the furnace door for sealing the furnace door.

[0006] As a preferred embodiment of the inert gas annealing furnace of the present invention, the large cooling box includes a box body, a heat exchanger, a first electric actuator and a heat exchange fan. The heat exchanger is sealed and welded inside the channel of the box body. The side of the furnace body away from the furnace door is connected to the channel of the box body through the first electric actuator. The heat exchange fan is located at the end of the box body away from the heat exchanger.

[0007] As a preferred embodiment of the inert gas annealing furnace described in this invention, the sealing assembly includes a square tube, a U-shaped high-temperature adhesive strip, asbestos packing, and a sealing cylinder. The square tube is located outside the furnace body near the furnace door, providing air insulation and sealing. The U-shaped high-temperature adhesive strip is located on the outside of the square tube, providing heat insulation and sealing. The asbestos packing is located between the square tube and the U-shaped high-temperature adhesive strip, providing sealing and heat insulation, forming a triple seal. The sealing cylinder is located outside the furnace body, and its drive end is connected to the furnace door, further ensuring the sealing of the furnace chamber.

[0008] As a preferred embodiment of the inert gas annealing furnace of the present invention, a water-sealed fan is provided at the top of the furnace body, which not only circulates the hot gas in the furnace chamber but also prevents external air from entering the furnace chamber, thus ensuring the sealing of the furnace chamber.

[0009] As a preferred embodiment of the inert gas annealing furnace of the present invention, the heater is provided with a sealing sleeve, the top of which is sealed with high-temperature resistant adhesive. The heater is sealed by the sealing sleeve, and a kerosene immersion leak test is conducted to ensure the sealing performance of the sealing sleeve to the heater. After the heater is installed, the upper end of the sealing sleeve is sealed with high-temperature resistant adhesive to ensure that external air cannot enter the interior of the furnace.

[0010] As a preferred embodiment of the inert gas annealing furnace of the present invention, an inert gas inlet connected to an inert gas inlet pipe is provided on one side of the furnace body, and a second electric actuator is provided at the inert gas inlet to deliver external inert gas into the furnace chamber, and the position of the inert gas inlet can be adjusted according to the actual situation.

[0011] As a preferred embodiment of the inert gas annealing furnace of the present invention, a vacuum pump is provided on one side of the furnace body for evacuating the furnace chamber.

[0012] As a preferred embodiment of the inert gas annealing furnace of the present invention, an oxygen analyzer is provided on one side of the furnace body to detect the oxygen content inside the furnace chamber.

[0013] As a preferred embodiment of the inert gas annealing furnace of the present invention, the top of the furnace body is provided with a flue pipe and a pressure relief pipe, a third electric actuator is provided on the flue pipe, and a fourth electric actuator is provided on the pressure relief pipe to facilitate flue gas exhaust and pressure relief. A pressure detector is provided inside the pressure relief pipe to detect the pressure inside the furnace chamber.

[0014] An annealing process using the aforementioned inert gas annealing furnace includes the following steps: S1: Open the furnace door, and the composite material cart feeds the material roll into the furnace chamber and then exits; S2: Close the furnace door, control the sealing cylinder to press the furnace door shut, and pre-evacuate the furnace using a vacuum pump, setting the working time to 30 minutes; S3: Open the second electric actuator, and inert gas enters the furnace chamber; S4: When the oxygen analyzer detects that the oxygen content in the furnace chamber is less than 5000 ppm, the second electric actuator and the first electric actuator are closed, and the heater and water-sealed fan are turned on to begin annealing; S5: During the annealing process, when the oxygen analyzer detects that the oxygen content in the furnace chamber is greater than 5000 ppm, the second electric actuator... The first actuator opens and inert gas is added until the oxygen analyzer detects that the oxygen content in the furnace is less than 5000 ppm, at which point the second electric actuator closes. When the pressure detector detects that the furnace pressure is greater than one standard atmosphere, the fourth electric actuator opens to release pressure until the furnace pressure returns to one standard atmosphere, at which point the fourth electric actuator closes. S6: After annealing is completed, the first electric actuator opens, the heat exchanger and heat exchange fan are started, and cooling circulating water is continuously injected into the heat exchanger. The heat exchange fan works in a cycle to reduce the temperature of the gas in the furnace. S7: When the temperature sensor detects that the temperature of the material roll has dropped to room temperature, the furnace door is opened, the composite material cart enters the furnace and pulls out the material roll.

[0015] The beneficial effects of this invention are as follows: 1. By cooperating with the furnace body, inert gas inlet pipe, large cooling box, and sealing components, the sealing performance of the furnace chamber is ensured during the annealing of alloy metal materials, achieving precise control of the oxygen content in the furnace chamber, thereby meeting the heat treatment requirements of alloy metal materials; 2. It improves the annealing performance and uniformity of alloy metals, and enhances the ductility, tensile strength, and electrical conductivity of the annealed metals; 3. It improves the operational safety of the entire heat treatment equipment; 4. It can effectively increase the yield rate, reduce enterprise production costs, and reduce import dependence. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. 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. Among them: Figure 1 is a schematic diagram of the overall structure of the inert gas annealing furnace.

[0017] Figure 2 is a schematic diagram of the internal structure of an inert gas annealing furnace.

[0018] Figure 3 is an enlarged view of point A in Figure 2.

[0019] Figure 4 is a schematic diagram showing the location and structure of the exhaust pipe and pressure relief pipe of the inert gas annealing furnace.

[0020] Figure 5 is an enlarged view of section B in Figure 4.

[0021] Figure 6 is a schematic diagram of the working state of the inert gas annealing furnace.

[0022] Figure 7 is a process flow diagram of the inert gas annealing furnace.

[0023] In the diagram: 1. Furnace body; 2. Furnace door; 3. Lifting mechanism; 4. I-beam; 5. Rail steel; 6. Inert gas inlet pipe; 7. Large cold box; 71. Box body; 72. Heat exchanger; 73. First electric actuator; 74. Heat exchange fan; 8. Sealing assembly; 81. Square tube; 82. U-shaped high-temperature rubber strip; 83. Asbestos packing; 84. Sealing cylinder; 9. Water-sealed fan; 10. Sealing sleeve; 11. Inert gas inlet; 12. Second electric actuator; 13. Vacuum pump; 14. Oxygen analyzer; 15. Exhaust pipe; 16. Pressure relief pipe; 17. Third electric actuator; 18. Fourth electric actuator; 19. Pressure detector; 20. Composite material cart; 21. Material roll; 22. Heater; 23. High-temperature resistant adhesive. Detailed Implementation

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments. Embodiment 1

[0027] Referring to Figures 1-6, this is the first embodiment of the present invention. This embodiment provides an inert gas annealing furnace, including a furnace body 1, a furnace door 2, and a heater 22. The furnace door 2 is disposed on one side of the furnace body 1 via a lifting mechanism 3. The heaters 22 are evenly distributed inside the furnace body 1. The bottom of the furnace body 1 is welded from I-beams 4, and a rail steel 5 is welded to the top of the I-beams 4. Inert gas inlet pipes 6 are distributed on both sides of the furnace chamber of the furnace body 1. A large cooling box 7 is disposed on the side of the furnace body 1 away from the furnace door 2 for rapid cooling of the high-temperature gas inside the furnace chamber. A sealing assembly 8 is disposed between the furnace body 1 and the furnace door 2 for sealing the furnace door 2.

[0028] The inert gas annealing furnace in this embodiment is an improvement on an existing annealing furnace. The furnace body 1 serves as the installation foundation for the entire annealing furnace. Because the sealing performance of welded channel steel is prone to detachment later, resulting in low sealing performance, the bottom of the furnace body 1 in this embodiment is welded from I-beams 4. The I-beams 4 are integrally cast, making them less prone to deformation compared to welded channel steel, thus improving the sealing performance of the bottom of the furnace body 1. After completing the overall sealing welding of the furnace body 1, a kerosene immersion leak test is conducted to further ensure its sealing performance. A 43kg / m rail steel 5 is welded to the top of the I-beams 4, and the sides are reinforced with... A heat treatment track fixing device, heat treatment track mechanism, and track fixing device in a heat treatment furnace, as specified in CN220393839U, are used to fix the track and improve its reliability. A furnace opening is provided at the left end of the furnace body 1. A furnace door 2 is installed at the furnace opening at the left end of the furnace body 1 via a lifting mechanism 3. The lifting mechanism 3 mainly consists of a reducer gear, a chain, and a counterweight box. When the furnace door 2 is opened, the reducer rotates forward, driving the furnace door 2 upward via the chain, while the counterweight box descends. Conversely, the furnace door 2 descends and closes. Heaters 22 are evenly distributed inside the furnace chamber of the furnace body 1, which heat the inert gas inside the furnace chamber. A composite material cart 20 is also installed on the left side of the furnace body 1. The composite material cart 20, in conjunction with a track, can transport the coil 21 to be annealed into the furnace chamber of the furnace body 1. Two inert gas inlet pipes 6 are symmetrically distributed on both sides of the furnace chamber. In other embodiments, the inert gas inlet pipes 6 can also be arranged at the top or bottom of the furnace chamber. Furthermore, this embodiment does not limit the specific number of inert gas inlet pipes 6; in other embodiments, the number can be four or six. The entire structure is made of 304 stainless steel, and an outlet hole is provided on the inert gas inlet pipe 6 to allow the inert gas inside the inert gas inlet pipe 6 to pass through. The gas enters the furnace chamber. A large cooling box 7 is installed at the end of the furnace body 1 away from the furnace door 2. After the metal in the furnace chamber is annealed, the high-temperature gas in the furnace chamber can be rapidly cooled through the large cooling box 7. A sealing component 8 is also installed between the furnace body 1 and the furnace door 2. The sealing component 8 can achieve a triple seal on the furnace door 2 to ensure the airtightness of the furnace chamber. In this embodiment, the furnace body 1, the inert gas inlet pipe 6, the large cooling box 7 and the sealing component 8 cooperate with each other to ensure the airtightness of the furnace chamber when annealing alloy metal materials, and to achieve precise control of the oxygen content in the furnace chamber, thereby meeting the heat treatment requirements of alloy metal materials.

[0029] Specifically, the large cold box 7 includes a box body 71, a heat exchanger 72, a first electric actuator 73, and a heat exchange fan 74. The heat exchanger 72 is sealed and welded inside the channel of the box body 71. The side of the furnace body 1 away from the furnace door 2 is connected to the channel of the box body 71 through the first electric actuator 73. The heat exchange fan 74 is located at the end of the box body 71 away from the heat exchanger 72.

[0030] The large-scale cold box 7 in this embodiment mainly consists of a box body 71, a heat exchanger 72, a first electric actuator 73, and a heat exchange fan 74. The box body 71 has a hollow "concave" structure. Two channels connecting to the furnace body 1 are formed on the upper and lower sides of the box body 71. The internal channels are made of SUS304 stainless steel and are sealed and welded, making them resistant to high temperatures. An insulation layer is provided in the middle to improve the overall insulation of the large-scale cold box. The exterior is made of Q235 steel plate and is sealed and welded. After the overall sealing and welding of the large-scale cold box is completed, a kerosene immersion leak test is required to further ensure its sealing performance. Stainless steel heat exchangers 72 are installed on the two channels through sealing and welding. 72 is connected to external cooling water. A first electric actuator 73 is installed at the port of the two channels of the housing 71. The other end of the first electric actuator 73 on the two channels is connected to the gas port at the right end of the furnace body 1 so that the high temperature gas in the furnace can flow out from one gas port, be cooled by the cooling box 7, and then re-enter the furnace through the other gas port to achieve rapid cooling of the high temperature gas in the furnace. A heat exchange fan 74 is installed at the end of the housing 71 away from the heat exchanger 72. The heat exchange fan 74 can rotate forward or backward to achieve rapid cooling of the high temperature gas in the furnace and prevent the alloy metal from being affected by oxidation at the high temperature of annealing.

[0031] Specifically, the sealing assembly 8 includes a square tube 81, a U-shaped high-temperature adhesive strip 82, an asbestos packing 83, and a sealing cylinder 84. The square tube 81 is located outside the furnace body 1 near the furnace door 2. The U-shaped high-temperature adhesive strip 82 is located on the outside of the square tube 81. The asbestos packing 83 is located between the square tube 81 and the U-shaped high-temperature adhesive strip 82, forming a triple seal. The sealing cylinder 84 is located on the outside of the furnace body 1, and the drive end of the sealing cylinder 84 is connected to the furnace door 2.

[0032] In this embodiment, the sealing assembly 8 mainly consists of a square tube 81, a U-shaped high-temperature adhesive strip 82, asbestos packing 83, and four sealing cylinders 84. A square tube 81 is installed on the outside of the furnace opening at the left end of the furnace body 1 to provide air insulation and sealing. A U-shaped high-temperature adhesive strip 82 is installed on the outside of the square tube 81 to provide heat insulation and sealing. Asbestos packing 83 is installed between the square tube 81 and the U-shaped high-temperature adhesive strip 82 to provide sealing and heat insulation. In other words, the square tube 81 and asbestos packing are installed sequentially from the inside to the outside of the furnace opening. The high-temperature rubber strip 82 and the 83 form a triple seal to improve the sealing performance of the furnace door 2 to the furnace opening, thereby preventing external air from entering the furnace chamber from the furnace opening. In addition, in this embodiment, four sealing cylinders 84 are symmetrically installed on the left and right sides of the furnace body 1 outside the furnace opening. The output end of the sealing cylinder 84 is connected to the furnace door 2. The sealing cylinder 84 can further press the closed furnace door 2, thereby further preventing external air from entering the furnace chamber from the furnace opening and further ensuring the sealing performance of the furnace chamber.

[0033] Furthermore, a water-sealed fan 9 is installed on the top of the furnace body 1.

[0034] In this embodiment, three water-sealed fans 9 are evenly distributed on the top of the furnace body 1. Compared with traditional fans, they are not only resistant to high temperatures and achieve circulation of high-temperature gas in the furnace, but also prevent external air from entering the furnace, thus ensuring the sealing of the furnace. It should be noted that this embodiment does not limit the specific number of water-sealed fans 9. In other embodiments, the number of water-sealed fans 9 can also be one or more.

[0035] Furthermore, the heater 22 is covered with a sealing sleeve 10, and the top of the sealing sleeve 10 is sealed with high-temperature resistant adhesive 23.

[0036] In this embodiment, a sealing sleeve 10 is fitted around the heater 22. The sleeve is mainly made of 321 stainless steel and welded together. The heater 22 is sealed by the sealing sleeve 10, and a kerosene immersion leak test is used to ensure the sealing performance of the sealing sleeve 10 to the heater 22. After the heater 22 is installed, the upper end of the sealing sleeve 10 is sealed with high-temperature resistant adhesive 23 to ensure that external air cannot enter the interior of the furnace.

[0037] Furthermore, an inert gas inlet 11 connected to an inert gas inlet pipe 6 is provided on one side of the furnace body 1, and a second electric actuator 12 is provided at the inert gas inlet 11.

[0038] In this embodiment, an inert gas inlet 11 connected to an inert gas inlet pipe 6 is installed on the outer side of the furnace body 1 to transport external inert gas into the furnace chamber. It should be noted that this embodiment does not limit the specific location of the inert gas inlet 11, that is, the specific location of the inert gas inlet 11 can be adjusted according to the actual site conditions. A second electric actuator 12 is also installed at the inert gas inlet 11. During operation, the inlet size of the inert gas can be automatically or manually adjusted according to the oxygen content data inside the furnace chamber to meet the heat treatment requirements of the alloy metal.

[0039] Furthermore, a vacuum pump 13 is installed on one side of the furnace body 1.

[0040] In this embodiment, a vacuum pump 13 is installed on the outside of the furnace body 1. The vacuum pump 13 is connected to the inside of the furnace chamber to evacuate the furnace chamber, thereby reducing the amount of inert gas introduced and thus reducing production costs.

[0041] Furthermore, an oxygen analyzer 14 is installed on one side of the furnace body 1.

[0042] In this embodiment, an oxygen analyzer 14 is installed on one side of the furnace body 1. The detection end of the oxygen analyzer 14 extends into the furnace chamber to detect the oxygen content in the furnace chamber.

[0043] Furthermore, the top of the furnace body 1 is provided with a flue pipe 15 and a pressure relief pipe 16. A third electric actuator 17 is provided on the flue pipe 15, a fourth electric actuator 18 is provided on the pressure relief pipe 16, and a pressure detector 19 is provided inside the pressure relief pipe 16.

[0044] In this embodiment, a flue pipe 15 and a pressure relief pipe 16 are installed at the top of the furnace body 1. Both the flue pipe 15 and the pressure relief pipe 16 are connected to the interior of the furnace. The flue pipe 15 can discharge the flue gas and impurity oil generated during the heating and temperature rise stage in the furnace. A third electric actuator 17 is installed at the outlet end of the flue pipe 15. The third electric actuator 17 can be used to open and close the flue pipe 15 electrically or manually. When the furnace pressure is too high, the replenishment of inert gas to the furnace is stopped. At this time, the pressure can be relieved through the pressure relief pipe 16. A fourth electric actuator 18 is installed at the outlet end of the pressure relief pipe 16. The fourth electric actuator 18 can automatically or manually switch the pressure relief pipe 16 on and off. In addition, this embodiment also includes a pressure detector 19 installed inside the pressure relief pipe 16. Since the pressure relief pipe 16 is connected to the furnace interior, the pressure detector 19 can directly detect the pressure inside the furnace. It should be noted that the electrical components involved in this embodiment, such as the lifting mechanism 3, the large cooling box 7, the water-sealed fan 9, the heater 22, the vacuum pump 13, the oxygen analyzer 14, and the electric actuator, are all controlled by a PLC. The specific PLC model can be a Siemens Samrt series. Example 2

[0045] Referring to Figures 1-7, this is the second embodiment of the present invention. This embodiment is based on the previous embodiment and provides an annealing process method using the inert gas annealing furnace involved in Embodiment 1. The method includes the following steps: S1: The material coil 21 is placed on the material rack of the composite material cart 20 using a lifting tool. The PLC controls the lifting mechanism 3 to open the furnace door 2. The hydraulic cylinder of the composite material cart 20 lifts the material rack and sends the material coil 21 into the furnace chamber. After reaching the designated position, the hydraulic cylinder of the composite material cart 20 descends, and the material rack and material coil 21 fall together onto the support column inside the furnace chamber. The composite material cart 20 then exits the furnace chamber. S2: After the composite material cart 20 exits the furnace chamber, the PLC first controls the lifting mechanism 3 to close the furnace door 2, and then controls the sealing cylinder 84 to press the furnace door 2 shut. Finally, the vacuum pump 13 is pre-vacuumed, and the working time is set to 30 minutes; S3: After the furnace is evacuated, the PLC controls the second electric actuator 12 to open, and the external inert gas enters the inert gas inlet pipe 6 through the inert gas inlet 11 and enters the furnace through the outlet hole on the inert gas inlet pipe 6; S4: The oxygen analyzer 14 starts working. When the oxygen analyzer 14 detects that the oxygen content in the furnace is less than 5000 ppm, the PLC first controls the second electric actuator 12 and the first electric actuator 73 to close, and then controls the heater 22 and the water-sealed fan 9 to work to start annealing. It should be noted that in the early stage of the furnace heating stage, the impurity oil on the coil 21 will decompose due to heat and form flue gas. The PLC controls the third electric actuator 17 to open and the exhaust fan to operate, so as to promptly discharge the flue gas generated in the furnace and avoid affecting the heat treatment of the coil 21; S5: During the annealing process, when the oxygen analyzer 14 detects that the oxygen content in the furnace is greater than 5000 ppm, the PLC controls the second electric actuator 12 to open and replenish inert gas until the oxygen analyzer 14 detects that the oxygen content in the furnace is less than 5000 ppm, at which point the PLC will control the second electric actuator 12 to close; when the pressure detector 19 detects that the furnace pressure is greater than one standard atmosphere, the PLC controls the fourth electric actuator 18 to open to release pressure until the furnace pressure returns to one standard atmosphere, at which point the PLC will control the fourth electric actuator 18 to close. The fourth electric actuator 18 is turned off. The above process flow needs to be carried out continuously within one process flow cycle to avoid oxidation of the alloy metal during annealing and to ensure the safety of the annealing furnace operation; S6: After annealing is completed, the PLC first controls the first electric actuator 73 to open, and then controls the heat exchanger 72 and the heat exchange fan 74 to work, and continuously injects cooling circulating water into the heat exchanger 72. The heat exchange fan 74 works in a cycle, so that the high temperature gas in the furnace enters the large cooling box 7 to reduce the replacement furnace temperature to room temperature; S7: When the temperature sensor detects that the temperature of the metal coil 21 has dropped to room temperature, the PLC controls the lifting mechanism 3 to open the furnace door 2, the composite material cart 20 enters the furnace and pulls out the material rack and the metal coil 21 on the material rack together.

[0046] It should be noted that all parts not specifically described in the above specification are existing technologies, or can be implemented by existing technologies. The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An inert gas annealing furnace, comprising a furnace body (1), a furnace door (2), a lifting mechanism (3), and heaters (22), wherein the furnace door (2) is disposed on one side of the furnace body (1) via the lifting mechanism (3), and the heaters (22) are evenly distributed within the furnace body (1), characterized in that: The bottom of the furnace body (1) is welded from I-beams (4), and the top of the I-beams (4) is welded with rail steel (5). Inert gas inlet pipes (6) are distributed on both sides of the furnace chamber of the furnace body (1). A large cooling box (7) is provided on the side of the furnace body (1) away from the furnace door (2) for rapid cooling of high-temperature gas in the furnace chamber. A sealing component (8) is provided between the furnace body (1) and the furnace door (2) for sealing the furnace door (2).

2. The inert gas annealing furnace as described in claim 1, characterized in that: The large cold box (7) includes a box body (71), a heat exchanger (72), a first electric actuator (73) and a heat exchange fan (74). The heat exchanger (72) is sealed and welded inside the channel of the box body (71). The side of the furnace body (1) away from the furnace door (2) is connected to the channel of the box body (71) through the first electric actuator (73). The heat exchange fan (74) is located at the end of the box body (71) away from the heat exchanger (72).

3. The inert gas annealing furnace as described in claim 2, characterized in that: The sealing assembly (8) includes a square tube (81), a U-shaped high-temperature adhesive strip (82), an asbestos packing (83), and a sealing cylinder (84). The square tube (81) is located outside the furnace body (1) near the furnace door (2). The U-shaped high-temperature adhesive strip (82) is located on the outside of the square tube (81). The asbestos packing (83) is located between the square tube (81) and the U-shaped high-temperature adhesive strip (82) to form a triple seal. The sealing cylinder (84) is located on the outside of the furnace body (1), and the drive end of the sealing cylinder (84) is connected to the furnace door (2).

4. The inert gas annealing furnace as described in claim 1, characterized in that: A water-sealed fan (9) is provided on the top of the furnace body (1).

5. The inert gas annealing furnace as described in claim 4, characterized in that: The heater (22) is covered with a sealing sleeve (10), and the top of the sealing sleeve (10) is sealed with high-temperature resistant adhesive (23).

6. The inert gas annealing furnace as described in claim 1, characterized in that: An inert gas inlet (11) is provided on one side of the furnace body (1) and is connected to an inert gas inlet pipe (6). A second electric actuator (12) is provided at the inert gas inlet (11).

7. The inert gas annealing furnace as described in claim 1, characterized in that: A vacuum pump (13) is installed on one side of the furnace body (1).

8. The inert gas annealing furnace as described in claim 7, characterized in that: An oxygen analyzer (14) is installed on one side of the furnace body (1).

9. The inert gas annealing furnace as described in claim 8, characterized in that: The top of the furnace body (1) is provided with a flue pipe (15) and a pressure relief pipe (16). A third electric actuator (17) is provided on the flue pipe (15), a fourth electric actuator (18) is provided on the pressure relief pipe (16), and a pressure detector (19) is provided inside the pressure relief pipe (16).

10. An annealing process method, employing an inert gas annealing furnace as described in any one of claims 1 to 9, characterized in that, The process includes the following steps: S1: Open the furnace door, the composite material cart sends the material roll into the furnace and then exits; S2: Close the furnace door, control the sealing cylinder to press the furnace door, the vacuum pump pre-evacuates the vacuum, and the working time is set to 30 minutes; S3: Open the second electric actuator, and inert gas enters the furnace. S4 S5: When the oxygen analyzer detects that the oxygen content in the furnace is less than 5000 ppm, the second and first electric actuators close, the heater and water-sealed fan open, and annealing begins; S6: During annealing, when the oxygen analyzer detects that the oxygen content in the furnace is greater than 5000 ppm, the second electric actuator opens to replenish inert gas until the oxygen analyzer detects that the oxygen content in the furnace is less than 5000 ppm, at which point the second electric actuator closes; when the pressure detector detects that the furnace pressure is greater than one standard atmosphere, the fourth electric actuator opens to release pressure until the furnace pressure returns to one standard atmosphere, at which point the fourth electric actuator closes. S6: After annealing is completed, turn on the first electric actuator, start the heat exchanger and heat exchange fan, continuously inject cooling circulating water into the heat exchanger, and the heat exchange fan works in a cycle to reduce the temperature of the gas in the furnace; S7: When the temperature sensor detects that the temperature of the material roll has dropped to room temperature, open the furnace door, the composite material car enters the furnace and pulls out the material roll.

Images