Pre-oxidation furnace

Abstract

The pre-oxidation furnace comprises a furnace body and a protection assembly, a pressure relief opening is formed in one side of the furnace body, the furnace body further comprises a pressure relief cover covering the pressure relief opening, and one end of the pressure relief cover is movably connected to the furnace body so that the pressure relief cover can be opened relative to the furnace body in response to the preset pressure in the furnace body. The protection assembly is arranged outside the furnace body and corresponds to the pressure relief opening, the protection assembly comprises a fixing frame and a fireproof curtain, one end of the fireproof curtain is connected to the fixing frame and can be switched between a first state and a second state relative to the fixing frame, when the fireproof curtain is in the first state, the fireproof curtain is exposed out of the pressure relief opening, and when the fireproof curtain is in the second state, the fireproof curtain is exposed out of the pressure relief opening. And the fireproof curtain shields the pressure relief opening. According to the pre-oxidation furnace, even if carbon fibers in the furnace body are deflagrated, the pressure relief cover is opened, flames rush out of the furnace body through the pressure relief opening, and the flames can be blocked by the fireproof curtain and cannot hurt workers located on the side, away from the furnace body, of the fireproof curtain.

Description

Technical Field

[0001] This application relates to the field of carbon fiber processing equipment, and more specifically, to a pre-oxidation furnace. Background Technology

[0002] The main processes for producing carbon fiber include precursor fiber production, pre-oxidation, carbonization, surface treatment, and winding. Each process significantly impacts the quality of the carbon fiber. Pre-oxidation refers to the necessary pre-oxidation process before carbonization of the carbon fiber precursor fiber, and the pre-oxidation furnace is a key piece of equipment in this process. During the pre-oxidation process in the furnace, a series of chemical changes occur on the surface of the precursor fiber, improving its performance. Without pre-oxidation, the linear molecular chains of the precursor fiber break down during high-temperature pyrolysis, transforming into resinous carbon instead of carbon fiber carbon with sufficient strength, resulting in extremely low performance. Therefore, the pre-oxidation process is crucial in carbon fiber production.

[0003] However, carbon fiber is still flammable during the pre-oxidation process. If carbon fiber burns in the oxidation furnace, the furnace pressure will increase instantly, and the flames rushing out of the furnace will cause injury to the workers. Utility Model Content

[0004] The purpose of this application is to provide a pre-oxidation furnace to improve the safety of the pre-oxidation furnace during use.

[0005] In a first aspect, embodiments of this application provide a pre-oxidation furnace, comprising: a furnace body, a pressure relief port on one side of the furnace body, and a pressure relief cover disposed on the pressure relief port, one end of the pressure relief cover being movably connected to the furnace body so that the pressure relief cover can open relative to the furnace body in response to a preset pressure inside the furnace body; and a protective component disposed outside the furnace body and corresponding to the pressure relief port, the protective component comprising a fixing frame and a fireproof curtain, one end of the fireproof curtain being connected to the fixing frame and being able to switch between a first state and a second state relative to the fixing frame, wherein when the fireproof curtain is in the first state, the fireproof curtain exposes the pressure relief port, and when the fireproof curtain is in the second state, the fireproof curtain blocks the pressure relief port.

[0006] In the above implementation process, by setting protective components corresponding to the pressure relief port on the outside of the furnace, and using a fixed frame, the fireproof curtain can be easily installed. When the carbon fiber inside the furnace does not pose a risk of deflagration, the fireproof curtain can be in the first state, which does not affect the normal operation of the staff. When the carbon fiber inside the furnace poses a risk of deflagration, the fireproof curtain can be in the second state, so that the fireproof curtain blocks the pressure relief port. At this time, even if the carbon fiber inside the furnace deflagrates and the pressure relief cover is opened, the flame will rush out of the furnace through the pressure relief port and will be blocked by the fireproof curtain, so as not to cause injury to the staff on the side of the fireproof curtain away from the furnace, thus protecting the safety of the staff and improving the safety of the pre-oxidation furnace during use.

[0007] In one possible implementation, the protective assembly also includes a roller rotatably connected to one side of the mounting frame, with the fire curtain wound around the roller and configured to rotate with the roller to switch between a first state and a second state.

[0008] In the above implementation process, by setting a roller in the protective component, the fireproof curtain can be rolled up on the roller to be in the first state, and can also be unrolled from the roller to be in the second state. The structure is simple and facilitates the switching of the fireproof curtain between the first state and the second state.

[0009] In one possible implementation, the pre-oxidation furnace also includes a pressure sensor, and the furnace body has a mounting hole that communicates with the interior of the furnace body, in which the pressure sensor is installed.

[0010] In the above implementation process, by installing pressure sensors in the mounting holes of the furnace body, the pressure value inside the furnace can be detected in real time. This allows the staff to use the pressure value inside the furnace to help judge the risk of deflagration of the carbon fiber inside the furnace, so as to take corresponding countermeasures in advance and further improve the safety of the staff.

[0011] In one possible implementation, the pre-oxidation furnace also includes a motor and a controller. The motor is connected to the roller drive, and the controller is electrically connected to both the motor and the pressure sensor. When the pressure value detected by the pressure sensor exceeds a preset pressure value, the controller is configured to control the motor to drive the roller to rotate, so that the fire curtain switches to the second state.

[0012] In the above implementation process, by setting up a motor connected to the roller drive and a controller electrically connected to the motor and pressure sensor respectively, the automation level of the pre-oxidation furnace is improved. When the pressure sensor detects that the pressure inside the furnace is continuously rising and is about to exceed the preset pressure value, the controller can control the motor to drive the roller to rotate, so that the fireproof curtain can automatically switch to the second state, thereby automatically unfolding the fireproof curtain before the carbon fiber inside the furnace causes deflagration, thus preventing problems before they occur.

[0013] In one possible implementation, there are multiple mounting holes, which are equally spaced on the furnace body, and multiple pressure sensors, which are installed in the corresponding mounting holes.

[0014] In the above implementation process, multiple mounting holes are set at equal intervals on the furnace body, and each pressure sensor is installed in a corresponding mounting hole. In this way, different pressure sensors can detect the pressure value in different areas of the furnace body, so as to achieve more accurate detection of the pressure value in the furnace body. This allows the staff to use the pressure value in different areas of the furnace body to more accurately help judge the level of risk of deflagration of carbon fiber in the furnace body.

[0015] In one possible implementation, the mounting frame includes two columns that are opposite to each other and spaced apart. The columns have grooves along the unfolding direction of the fire curtain, which are used to allow at least part of the fire curtain to pass through.

[0016] In the above implementation process, by setting a sliding groove on the column of the fixed frame along the unfolding direction of the fire curtain, the column with the sliding groove can not only guide the fire curtain during its unfolding process, making it unfold more smoothly, but also block and limit the fire curtain in the second state, preventing the fire curtain from flying off and losing its position due to impact, and ensuring that the fire curtain can achieve the function of blocking impact.

[0017] In one possible implementation, the mounting bracket also includes a blocking part on the column, which is located on the side of the fire curtain away from the furnace body when the fire curtain is in the second state.

[0018] In the above implementation process, by setting a blocking part on the column, when the fire curtain is in the second state, the blocking part is located on the side of the fire curtain away from the furnace body, which can better block and limit the fire curtain. In addition, the blocking part is easy to install and the setting position is adjustable, which can better meet a variety of different usage needs.

[0019] In one possible implementation, one end of the blocking part is movably connected to one of the posts, and the other end of the blocking part is configured to extend in a direction pointing to another post.

[0020] In the above implementation process, by movably connecting one end of the blocking part to one of the columns, when the fire curtain is in the first state, the blocking part can be rotated to a position flush with the column to achieve relative concealment without affecting the normal operation of the staff. By configuring the other end of the blocking part to extend in the direction of pointing to another column, when the fire curtain is in the second state, the blocking part can be rotated to the side of the fire curtain away from the furnace body, which can better block and limit the fire curtain.

[0021] In one possible implementation, the fire curtain comprises multiple layers of fire-resistant material interconnected with each other, with gaps between adjacent fire-resistant material layers filled with fire-resistant fluid.

[0022] In the above implementation process, by setting up a fireproof curtain consisting of multiple interconnected fireproof material layers, with fireproof fluid filling the gaps between adjacent fireproof material layers, the fireproof performance of the fireproof curtain can be improved, preventing flames generated by the deflagration of carbon fiber from passing through the fireproof curtain and rushing out of the furnace body, thus further improving the safety of the staff.

[0023] In one possible implementation, there are multiple pressure relief vents, and when the fire curtain is in the second state, the fire curtain covers each pressure relief vent.

[0024] In the above implementation process, by setting multiple pressure relief ports on the furnace body, the pressure relief efficiency can be improved. When the fireproof curtain is in the second state, the fireproof curtain blocks each pressure relief port, so that the fireproof curtain can block the flames that rush out of the furnace body through each pressure relief port. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a pre-oxidation furnace from one perspective, provided as an embodiment of this application.

[0027] Figure 2 This is a schematic diagram of the structure of a pre-oxidation furnace provided in an embodiment of this application from another perspective;

[0028] Figure 3 This is a schematic diagram of the connection structure between the pressure relief cover and the furnace body in a pre-oxidation furnace, as provided in an embodiment of this application.

[0029] Icons: 100-furnace body; 110-pressure relief port; 120-pressure relief cover; 130-mounting hole; 200-protective component; 210-fixed bracket; 211-column; 212-slide groove; 213-blocking part; 220-roller; 230-fireproof curtain; 300-pressure sensor. Detailed Implementation

[0030] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] This application provides a pre-oxidation furnace. By installing a protective component on the furnace exterior corresponding to the pressure relief port, and using a fixing frame to easily install a fireproof curtain, when the carbon fiber inside the furnace does not pose a risk of deflagration, the fireproof curtain can be in a first state, i.e., the fireproof curtain is retracted relative to the furnace body, without affecting the normal operation of the staff. When the carbon fiber inside the furnace poses a risk of deflagration, the fireproof curtain can be in a second state, i.e., the fireproof curtain is unfolded relative to the furnace body, so that the fireproof curtain blocks the pressure relief port. At this time, even if the carbon fiber inside the furnace deflagrates and the pressure relief cover is opened, the flames rushing out of the furnace body through the pressure relief port will be blocked by the fireproof curtain and will not cause harm to the staff located on the side of the fireproof curtain away from the furnace body, thus protecting the safety of the staff and improving the safety of the pre-oxidation furnace during use.

[0038] Please see Figures 1 to 3 As shown, in some embodiments, the pre-oxidation furnace provided in this application includes a furnace body 100 and a protective assembly 200. A pressure relief port 110 is provided on one side of the furnace body 100. The furnace body 100 also includes a pressure relief cover 120 covering the pressure relief port 110. One end of the pressure relief cover 120 is movably connected to the furnace body 100, so that the pressure relief cover 120 can open relative to the furnace body 100 in response to a preset pressure within the furnace body 100. The protective assembly 200 includes a fixing frame 210 and a fireproof curtain 230. One end of the fireproof curtain 230 is connected to the fixing frame 210 and can switch between a first state and a second state relative to the fixing frame 210. When the fireproof curtain 230 is in the first state, the fireproof curtain 230 exposes the pressure relief port 110. When the fireproof curtain 230 is in the second state, the fireproof curtain 230 blocks the pressure relief port 110.

[0039] It will be readily understood by those skilled in the art that the furnace body 100 should have a heating chamber for placing the carbon fibers to be oxidized. A feed inlet communicating with the heating chamber is located on one side of the furnace body 100, and a pressure relief port 110 on one side of the furnace body 100 is also communicating with the heating chamber. The shape and size of the furnace body 100, the position and size of the heating chamber, and the shape, position, and size of the pressure relief port 110 can all be adjusted and set according to different usage requirements, and are not limited here. The furnace body 100 is also provided with a pressure relief cover 120 covering the pressure relief port 110. The pressure relief cover 120 is secured to the pressure relief port 110 with a certain pre-tightening force, enabling the pressure relief port 110 to be sealed under normal conditions. Furthermore, one end of the pressure relief cover 120 is movably connected to the furnace body 100. When the pressure inside the furnace body 100 increases and the pushing force on the pressure relief cover 120 exceeds the bearing limit of the pressure relief cover 120, the pressure relief cover 120 will be pushed open, thereby enabling the pressure relief cover 120 to open relative to the furnace body 100 in response to the preset pressure inside the furnace body 100, completing the pressure relief inside the furnace body 100 and reducing the risk of carbon fiber deflagration inside the furnace body 100.

[0040] The protective component 200 is disposed outside the furnace body 100 and corresponds to the pressure relief port 110. One end of the fireproof curtain 230 is connected to the fixing frame 210 and can switch between a first state and a second state relative to the fixing frame 210. For example, the fireproof curtain 230 can be rolled up by folding, rolling up, etc. When the fireproof curtain 230 is in the first state, that is, the fireproof curtain 230 is rolled up relative to the furnace body 100, and the fireproof curtain 230 exposes the pressure relief port 110. When the fireproof curtain 230 is in the second state, that is, the fireproof curtain 230 is rolled up relative to the furnace body 100, and the fireproof curtain 230 covers the pressure relief port 110.

[0041] By adjusting the positions of the fixing bracket 210 and the fireproof curtain 230, when the fireproof curtain 230 is in the second state, it can block the pressure relief port 110. In this way, even if the carbon fiber inside the furnace body 100 undergoes deflagration and the flames rush out of the furnace body 100 through the pressure relief port 110, they will be blocked by the fireproof curtain 230 and will not cause harm to the personnel on the side of the fireproof curtain 230 away from the furnace body 100. This protects the safety of the personnel and improves the safety of the pre-oxidation furnace during use.

[0042] In some embodiments, the protective assembly 200 further includes a roller 220 rotatably connected to one side of the mounting bracket 210, and a fire curtain 230 is wound around the roller 220 and configured to rotate with the roller 220 to switch between a first state and a second state. As shown in the figure, the roller 220 is rotatably connected to one side of the fixed frame 210. The fireproof curtain 230 is wound around the roller 220 and configured to rotate around the roller 220. When the roller 220 rotates counterclockwise, the fireproof curtain 230 wound on the roller 220 also rotates counterclockwise, thereby driving the lower end of the fireproof curtain 230 to move upward and be rolled up and stored. At this time, the fireproof curtain 230 is in the first state. When the roller 220 rotates clockwise, the fireproof curtain 230 wound on the roller 220 also rotates clockwise, thereby driving the lower end of the fireproof curtain 230 to move downward and be unfurled. At this time, the fireproof curtain 230 is in the second state.

[0043] In one possible implementation, the pre-oxidation furnace also includes a pressure sensor 300, and the furnace body 100 is provided with a mounting hole 130 communicating with the interior of the furnace body 100, and the pressure sensor 300 is installed in the mounting hole 130.

[0044] A pressure sensor 300 (Pressure Transducer) is a device or apparatus that can sense pressure signals and convert them into usable electrical output signals according to a certain rule. A pressure sensor 300 typically consists of a pressure-sensitive element and a signal processing unit. Depending on the type of pressure being tested, pressure sensors 300 can be classified as gauge pressure sensors, differential pressure sensors, and absolute pressure sensors; the type of pressure sensor 300 used in this embodiment is not limited. By installing the pressure sensor 300 in the mounting hole 130 of the furnace body 100, the pressure value inside the furnace body 100 can be detected in real time. This allows workers to use the pressure value inside the furnace body 100 to help determine the risk of deflagration of the carbon fiber inside the furnace body 100, enabling them to take appropriate countermeasures in advance and further improving worker safety.

[0045] In one possible implementation, the pre-oxidation furnace also includes a motor and a controller. The motor is driven by the roller 220, and the controller is electrically connected to both the motor and the pressure sensor 300. When the pressure value detected by the pressure sensor 300 exceeds a preset pressure value, the controller is configured to control the motor to drive the roller 220 to rotate, so that the fire curtain 230 switches to the second state.

[0046] The motor is connected to the roller 220 to drive the roller 220 to rotate. The controller is electrically connected to the motor and the pressure sensor 300 respectively, so that it can receive the detection data of the pressure sensor 300 and control the motor to open and close. By setting the motor connected to the roller 220 and the controller electrically connected to the motor and the pressure sensor 300 respectively, the automation level of the pre-oxidation furnace is improved. When the pressure sensor 300 detects that the pressure inside the furnace body 100 is continuously rising and is about to exceed the preset pressure value, the controller can control the motor to drive the roller 220 to rotate, so that the fire curtain 230 automatically switches to the second state, thereby automatically unfolding the fire curtain 230 before the carbon fiber inside the furnace body 100 explodes, preventing problems before they occur.

[0047] To improve the accuracy of pressure detection within the furnace body 100, in one possible implementation, multiple mounting holes 130 are provided on the furnace body 100 at equal intervals, and multiple pressure sensors 300 are installed in corresponding mounting holes 130. By providing multiple mounting holes 130 at equal intervals on the furnace body 100, and installing each pressure sensor 300 in corresponding mounting holes 130, different pressure sensors 300 can detect pressure values ​​in different areas within the furnace body 100, achieving more accurate detection of pressure values ​​within the furnace body 100. This allows operators to use the pressure values ​​in different areas within the furnace body 100 to more accurately assess the risk of deflagration of carbon fibers within the furnace body 100.

[0048] The structure of the fixing frame 210 is not limited. In one possible implementation, the fixing frame 210 includes two uprights 211 that are opposite to each other and spaced apart. The uprights 211 are provided with grooves 212 along the unfolding direction of the fire curtain 230. The grooves 212 are used for at least part of the fire curtain 230 to pass through. By providing grooves 212 on the uprights 211 of the fixing frame 210 along the unfolding direction of the fire curtain 230, the uprights 211 with grooves 212 can not only guide the fire curtain 230 during its unfolding process, making its unfolding smoother, but also block and limit the fire curtain 230 in its second state, preventing the fire curtain 230 from flying off and losing its position due to impact, and ensuring that the fire curtain 230 can achieve the function of blocking impact.

[0049] Of course, in some other embodiments, a crossbeam can also be provided between the two columns 211 to connect the two columns 211 respectively, so as to improve the stability of the columns 211.

[0050] To enhance the blocking effect of the mounting bracket 210 on the fireproof curtain 230, in one possible implementation, the mounting bracket 210 further includes a blocking part 213. This blocking part 213, mounted on the column 211, is located on the side of the fireproof curtain 230 away from the furnace body 100 when the fireproof curtain 230 is in its second state. By providing the blocking part 213 on the column 211, when the fireproof curtain 230 is in its second state, the blocking part 213 is located on the side of the fireproof curtain 230 away from the furnace body 100, thus providing better blocking and limiting of the fireproof curtain 230. Furthermore, the blocking part 213 is easy to install and its position is adjustable, effectively meeting various usage requirements.

[0051] The blocking part 213 can be a baffle, block, blocking strip, or other structure. When the fire curtain 230 is in the second state, the blocking part 213 can further shield the fire curtain 230 from the impact of the deflagration flame. The specific number and location of the blocking parts 213 are not limited. The blocking part 213 can be provided on any one of the columns 211, or multiple blocking parts 213 of varying numbers can be provided on each of the two columns 211. For example, in some embodiments, one end of the blocking part 213 is movably connected to one of the columns 211, and the other end of the blocking part 213 is configured to extend in a direction pointing towards the other column 211. By movably connecting one end of the blocking part 213 to one of the columns 211, when the fire curtain 230 is in the first state, the blocking part 213 can be rotated to a position flush with the column 211 to achieve relative concealment and not affect the normal operation of the staff. By configuring the other end of the blocking part 213 to extend in the direction of pointing to the other column 211, when the fire curtain 230 is in the second state, the blocking part 213 can be rotated to the side of the fire curtain 230 away from the furnace body 100, which can better block and limit the fire curtain 230.

[0052] In one possible implementation, the fire curtain 230 comprises multiple interconnected layers of fire-resistant material, with gaps between adjacent layers filled with a fire-retardant fluid. By providing a fire curtain 230 with multiple interconnected layers of fire-resistant material and gaps between adjacent layers filled with a fire-retardant fluid, the fire resistance of the fire curtain 230 can be improved, preventing flames generated by the deflagration of carbon fiber from passing through the fire curtain 230 and escaping outside the furnace body 100, further enhancing the safety of personnel. In some embodiments, specifically, the fire-resistant material layers can be carbon fiber cloth layers, and the fire curtain 230 comprises two or more layers of carbon fiber cloth sewn together, with gaps between adjacent layers filled with water. The fire curtain 230 thus constructed possesses advantages such as being lightweight and fire-resistant.

[0053] In one possible implementation, there are multiple pressure relief ports 110. When the fire curtain 230 is in the second state, it blocks each pressure relief port 110. By providing multiple pressure relief ports 110 on the furnace body 100, the pressure relief efficiency can be improved. When the fire curtain 230 is in the second state, it blocks each pressure relief port 110, thus preventing flames from rushing out of the furnace body 100 through each pressure relief port 110.

[0054] The working principle of the pre-oxidation furnace: Before heating the carbon fiber using the furnace body 100, and during the initial heating process, the carbon fiber inside the furnace body 100 does not pose a risk of deflagration. The fireproof curtain 230 is rolled up on the fixed frame 210 in the first state, exposing the feed inlet and pressure relief port 110, which does not affect the normal operation of the personnel. As the heating process progresses, when the carbon fiber inside the furnace body 100 poses a risk of deflagration, the fireproof curtain 230 is unrolled from the fixed frame 210 to the second state. The fireproof curtain 230 covers the feed inlet and pressure relief port 110. At this time, even if the carbon fiber inside the furnace body 100 deflagrates, the flames will be blocked by the fireproof curtain 230 when they rush out of the furnace body 100 through the pressure relief port 110, thus preventing injury to the personnel located on the side of the fireproof curtain 230 away from the furnace body 100, protecting the safety of the personnel, and improving the safety of the pre-oxidation furnace during use.

[0055] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A pre-oxidation furnace, characterized in that, include: The furnace body has a pressure relief port on one side. The furnace body also includes a pressure relief cover that is placed over the pressure relief port. One end of the pressure relief cover is movably connected to the furnace body so that the pressure relief cover can open relative to the furnace body in response to a preset pressure inside the furnace body. A protective component is disposed outside the furnace body and corresponding to the pressure relief port. The protective component includes a fixing frame and a fireproof curtain. One end of the fireproof curtain is connected to the fixing frame and can switch between a first state and a second state relative to the fixing frame. When the fireproof curtain is in the first state, the fireproof curtain exposes the pressure relief port. When the fireproof curtain is in the second state, the fireproof curtain blocks the pressure relief port.

2. The pre-oxidation furnace according to claim 1, characterized in that, The protective assembly also includes a roller rotatably connected to one side of the mounting frame, the fireproof curtain being wound around the roller and configured to rotate with the roller to switch between a first state and a second state.

3. The pre-oxidation furnace according to claim 2, characterized in that, The pre-oxidation furnace also includes a pressure sensor, and the furnace body is provided with an installation hole that communicates with the interior of the furnace body, and the pressure sensor is installed in the installation hole.

4. The pre-oxidation furnace according to claim 3, characterized in that, The pre-oxidation furnace also includes a motor and a controller. The motor is connected to the roller drive, and the controller is electrically connected to the motor and the pressure sensor respectively. When the pressure value detected by the pressure sensor exceeds the preset pressure value, the controller is configured to control the motor to drive the roller to rotate, so that the fireproof curtain switches to the second state.

5. The pre-oxidation furnace according to claim 3, characterized in that, The number of mounting holes is multiple, and each mounting hole is equally spaced on the furnace body. The number of pressure sensors is multiple, and each pressure sensor is installed in a corresponding mounting hole.

6. The pre-oxidation furnace according to claim 1, characterized in that, The fixing frame includes two columns that are opposite to each other and spaced apart. The columns are provided with grooves along the unfolding direction of the fireproof curtain, and the grooves are used for at least part of the fireproof curtain to pass through.

7. The pre-oxidation furnace according to claim 6, characterized in that, The fixing frame also includes a blocking part provided on the column. When the fireproof curtain is in the second state, the blocking part is located on the side of the fireproof curtain away from the furnace body.

8. The pre-oxidation furnace according to claim 7, characterized in that, One end of the blocking part is movably connected to one of the columns, and the other end of the blocking part is configured to extend in a direction pointing towards the other column.

9. The pre-oxidation furnace according to claim 1, characterized in that, The fireproof curtain comprises multiple layers of fireproof material connected to each other, with gaps between adjacent fireproof material layers, and the gaps are filled with fireproof fluid.

10. The pre-oxidation furnace according to claim 1, characterized in that, There are multiple pressure relief ports. When the fireproof curtain is in the second state, the fireproof curtain blocks each of the pressure relief ports.

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