Carbon fiber oxidation furnace cooling sealing door

Abstract

The utility model discloses a carbon fiber oxidizing furnace cooling sealing door relates to carbon fiber production equipment field. In view of the existing furnace door seal not thoroughly, poor heat dissipation, the problem of inconvenient operation maintenance, it includes three layer composite furnace door, rocker assembly, four groups of hand wheel locking assembly, double seal structure and S type cooling circulation structure. The high temperature resistant sealing rope is established between the inner heat insulation door body and wall, and the dovetail groove O type ring is established between the furnace door pressing plate and wall, forms double seal, and the cooling circulation structure is integrated in the outer door body and covers the sealed area, and is supplemented with the spiral pipe and internal thread joint. The structure can completely block the harmful gas, reduce the furnace door temperature, prolong the service life of sealing element, and the operation maintenance is convenient, and adapts the production line demand.

Description

Technical Field

[0001] This utility model relates to the field of carbon fiber production equipment technology, and in particular to a cooling and sealing door for a carbon fiber oxidation furnace. Background Technology

[0002] As a high-performance fiber material, carbon fiber requires an oxidation furnace as the key equipment for pre-oxidation treatment of carbon fiber bundles during its production process. The furnace door, as an important component of the oxidation furnace, directly affects production safety, process stability, and equipment lifespan due to its sealing and cooling performance.

[0003] Currently, the oxidation furnace doors of carbon fiber production lines in the industry generally adopt a compression sealing structure. Specifically, high-temperature resistant packing is installed in a pre-set groove in the furnace wall, and then pressure is applied to the packing by a compression mechanism to achieve a heat insulation seal between the furnace door and the furnace body. However, this type of sealing structure has significant drawbacks in practical applications: due to factors such as the uniformity of packing compression and aging deformation after long-term use, it is difficult to completely block the furnace temperature and harmful gases through simple compression operations; especially when the furnace cavity is under positive pressure, high-temperature toxic and harmful gases inside the furnace are more likely to break through the packing seal gap and overflow into the workshop environment, not only causing pollution of the work space, but also posing serious health and safety hazards to on-site operators.

[0004] Meanwhile, the existing oxidation furnace doors often employ complex sheet metal splicing designs for their frames and internal support structures. This type of structure has a complex heat conduction path and low heat dissipation efficiency, making it easy for high temperatures inside the furnace to be conducted to the furnace door surface through the sheet metal structure, causing the furnace door surface temperature to rise continuously. This makes it extremely easy for operators to suffer burns from accidental contact with the high-temperature surface when opening and closing the furnace door or conducting equipment inspections. Furthermore, the high temperatures conducted by the furnace door further accelerate the aging and carbonization process of sealing components such as high-temperature packing, drastically shortening the service life of the sealing measures. This not only increases the frequency of equipment maintenance and spare parts costs but also may lead to frequent unplanned shutdowns due to seal failure, seriously affecting the continuous and stable operation of the production line.

[0005] Therefore, developing a furnace door structure for carbon fiber oxidation furnaces that can simultaneously solve the problems of incomplete sealing and poor heat dissipation has become a pressing technical challenge in the field of carbon fiber production equipment. Utility Model Content

[0006] The purpose of this utility model is to provide a cooling and sealing door for a carbon fiber oxidation furnace, in order to solve all or part of the technical problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: A cooling and sealing door for a carbon fiber oxidation furnace includes: a furnace door, a rocker arm, a rocker arm seat, an inlet pipe connector, a return pipe connector, a locking assembly, a first sealing structure, a second sealing structure, and a cooling circulation structure.

[0008] The furnace door includes an inner insulating door body, a furnace door pressure plate, and an outer door body. The furnace door pressure plate is installed inside the outer door body, and the inner insulating door body is installed inside the furnace door pressure plate. When closed, the inner insulating door body is embedded in the oxidation furnace wall, and the furnace door pressure plate is in contact with the outer wall of the oxidation furnace wall. The three-layer composite structure of the furnace door, with the inner insulating door body embedded in the wall and the furnace door pressure plate in contact with the outer wall, forms a basic heat insulation barrier through the inner insulating door body, and achieves a tight fit of the sealing surface with the help of the pressure plate, providing a structural basis for double sealing.

[0009] Two sets of rocker arm seats are fixed to the oxidation furnace wall, one above the other. The rocker arm is rotatably connected to the upper and lower rocker arm seats via a rotating shaft or rotating bolt. The rocker arm seats are movably connected to the outer door. The furnace door is opened and closed by rotating the rocker arm. The first component of the locking assembly is set on the oxidation furnace wall, and the second component is set on the outer door. The first component and the second component cooperate to lock the furnace door. There are several sets of locking assemblies. Preferably, there are four sets of locking assemblies, two sets distributed above the furnace door and two sets distributed below the furnace door. The four sets of locking assemblies distributed vertically provide stable pressure for the sealing structure by applying force evenly at multiple points. The cooling circulation structure is set inside the outer door. The liquid inlet pipe joint and the liquid return pipe joint pass through the outer door and are respectively connected to the liquid inlet end and the liquid return end of the cooling circulation structure. A first sealing structure is set between the outer wall of the oxidation furnace wall and the furnace door pressure plate. A second sealing structure is set between the inner side of the inner partition door and the wall mating part. The projection of the cooling circulation structure covers the first sealing structure. The first and second double sealing structures act on the outer wall and pressure plate, and the inner door and wall mating parts, respectively, forming two lines of defense to block the escape path of high-temperature harmful gases. The cooling circulation structure is integrated into the outer door and its projection covers the first sealing structure. This not only reduces the surface temperature of the furnace door through circulating cooling, preventing burns to operators, but also cools the sealing structure, slowing down the aging of the seals and extending their service life.

[0010] In an embodiment that optimizes the aforementioned solution, the locking assembly includes a first component and a second component. The first component includes a handwheel and a locking block, and the second component includes a pressure plate. The locking block is fixed to the wall of the oxidation furnace. A connecting rod on the handwheel is movably fixed to the locking block. The pressure plate is fixed to the outer door. The handwheel cooperates with the pressure plate to engage the connecting rod in the pressure plate groove. By rotating the rotating part of the handwheel, the furnace door is pressed shut. Through the mechanical cooperation of the handwheel, locking block, and pressure plate, the pressing is completed by rotating the handwheel after engaging the connecting rod in the pressure plate groove, without the need for complex tools, thus lowering the operational threshold. The assembly method of fixing the locking block to the wall and the pressure plate to the outer door ensures that the pressing force acts directly on the contact surface between the furnace door and the wall. Combined with the four sets of distributed layouts, the force on each point of the sealing surface is uniform, avoiding local sealing failure and further enhancing the sealing effect of the double sealing structure, solving the problems of insufficient pressure and uneven force distribution in traditional pressing mechanisms.

[0011] In an embodiment that optimizes the aforementioned solution, an internally threaded inlet pipe and an internally threaded return pipe are further included. The internally threaded inlet pipe is disposed on the outer door surface and connects to the inlet end of the cooling circulation structure. The internally threaded return pipe is disposed on the outer door surface and connects to the return end of the cooling circulation structure. An inlet pipe connector is connected to the internally threaded inlet pipe, and a return pipe connector is connected to the internally threaded return pipe. The internally threaded structure provides a threaded sealing connection between the inlet pipe connector, the return pipe connector, and the cooling circulation structure. Compared to direct connection, this effectively prevents coolant leakage during circulation. Simultaneously, the detachable nature of the threaded connection facilitates subsequent maintenance and replacement of the cooling pipes, reducing equipment repair costs and ensuring the continuous and stable operation of the cooling circulation.

[0012] In an embodiment that optimizes the aforementioned solution, the system further includes an inlet spiral tube and a return spiral tube, with the inlet spiral tube connected to an inlet pipe connector and the return spiral tube connected to a return pipe connector. The spiral tube structure buffers fluid impact, reducing flow rate fluctuations when the coolant enters the cooling circulation structure and preventing uneven heat exchange caused by excessively high local flow rates. Simultaneously, the spiral tube extends the residence time of the coolant in the inlet / outlet section, allowing the coolant to enter the S-shaped cooling unit or flow out of the return unit more smoothly, improving overall cooling efficiency and ensuring uniform cooling of the furnace door and sealing structure.

[0013] In an embodiment that optimizes the aforementioned solution, the first sealing structure is disposed between the outer wall of the oxidation furnace wall and the furnace door pressure plate. A first sealing surface is disposed on the outer wall of the wall, and a second sealing surface is disposed on the inner side of the furnace door pressure plate. A dovetail groove is formed on the second sealing surface, and an O-ring is embedded in the dovetail groove. When the furnace door is closed, the first sealing surface and the second sealing surface are aligned. The first sealing surface is disposed around the furnace door opening on the wall, and the second sealing surface is disposed on the surface of the furnace door pressure plate, surrounding the outer edge of the furnace door pressure plate. By forming a dovetail groove and embedding an O-ring on the second sealing surface of the furnace door pressure plate, the dovetail groove can mechanically limit the O-ring, preventing it from shifting or falling off during pressing or opening and closing, thus ensuring the installation stability of the seal. The annular layout surrounding the furnace door opening and the outer edge of the pressure plate allows the sealing ring to completely cover the gap area. When the furnace door is closed, the first sealing surface and the second sealing surface fit together and compress the O-ring, forming a tight outer seal, preventing the small amount of gas that has broken through the inner layer from further escaping. This, together with the second sealing structure, forms double protection and enhances the overall sealing performance.

[0014] In an embodiment that optimizes the aforementioned solution, the second sealing structure is disposed between the inner side of the inner heat exchanger and the wall mating part. A bent plate is disposed on the inner side of the inner heat exchanger, and a high-temperature resistant sealing rope is disposed on the wall mating part. When the furnace door is closed, the bent plate and the high-temperature resistant sealing rope are positioned to mate. The bent plate is disposed on the inner surface of the inner heat exchanger, surrounding the outer edge of the inner heat exchanger, and the high-temperature resistant sealing rope is embedded around and embedded in the wall mating part. For the high-temperature environment inside the furnace, a high-temperature resistant sealing rope is selected as the core sealing component, suitable for the working temperature of the oxidation furnace. The bent plate of the inner heat exchanger and the sealing rope of the wall mating part form a "compression-sealing" fit. The layout surrounding the outer edge ensures that the sealing rope completely fits the gap, directly preventing the high-temperature gas and heat inside the furnace from penetrating outward, becoming the first key barrier against harmful substances and high temperatures. The structural design of the bent plate can efficiently transfer the clamping force of the locking component to the sealing rope, causing it to deform uniformly, further improving the sealing reliability under high-temperature conditions and solving the problem of traditional packing aging and sealing failure at high temperatures.

[0015] In an embodiment that optimizes the aforementioned scheme, the cooling circulation structure includes a cooling unit and a reflux unit. The cooling unit is an S-shaped liquid channel arranged in the same plane, with an internally threaded inlet pipe connected to the starting point of the liquid channel in the cooling unit. The reflux unit is a liquid channel in the same plane as the cooling unit, with the starting point of the reflux unit connected to the ending point of the liquid channel in the cooling unit, and the internally threaded return pipe connected to the ending point of the liquid channel in the reflux unit. Designing the cooling unit as an S-shaped liquid channel can significantly extend the flow path of the coolant and expand the heat exchange area within the limited space of the outer door, allowing the coolant to fully exchange heat with the furnace door and sealing structure, thus significantly improving the cooling effect. The reflux unit and the cooling unit are arranged on the same plane, simplifying the overall structure of the cooling channel and reducing processing difficulty and manufacturing costs. At the same time, the flow path design, with the inlet end connected to the starting point of the cooling unit and the return end connected to the ending point of the reflux unit, ensures that the coolant circulates efficiently in the sequence of "inlet-cooling-reflux-outlet," avoiding cooling dead zones caused by turbulent flow paths.

[0016] In one embodiment that optimizes the aforementioned solution, the starting point of the liquid channel of the cooling unit and the ending point of the liquid channel of the return unit are located close to each other. This proximity allows the inlet and return pipe connectors to be centrally arranged on the outer door surface, avoiding cluttered installation caused by dispersed piping. This centralized layout facilitates the connection of external cooling system piping, reduces pipe length and bends, lowers fluid resistance, and provides installation space for other furnace door components, such as locking assemblies, resulting in a more compact and rational overall structure, and improving the integration and practicality of the equipment.

[0017] This utility model addresses the technical pain points of existing carbon fiber oxidation furnaces, such as incomplete furnace door sealing, poor heat dissipation, inconvenient operation and maintenance, and poor structural adaptability. Through targeted structural design, it achieves multiple core benefits: a double-sealing structure with inner and outer defenses. The inner layer consists of a tightly fitted inner door body bending plate and a high-temperature resistant sealing rope on the wall, forming a high-temperature barrier. The outer layer is constructed with an O-ring seal limited by a dovetail groove on the furnace door pressure plate, providing outer protection. Combined with four sets of distributed locking components applying force evenly at multiple points, this solves the problem of easy leakage under positive pressure conditions with traditional single packing seals, significantly improving production safety. An S-shaped cooling circulation system is integrated within the outer door body. The structure extends the coolant flow path and expands the heat exchange area within a limited space, while projecting and covering the sealing structure. This, coupled with fluid buffering via inlet / return spiral pipes and leak-proof design via internal threaded connections, effectively controls the furnace door surface temperature to prevent burns to operators, slows down the aging and carbonization of seals, and reduces maintenance costs and the risk of unplanned downtime. The handwheel locking assembly simplifies furnace door opening and closing, and the internal threaded pipe design facilitates cooling system maintenance, significantly lowering the operational and maintenance threshold and costs. Furthermore, the triple-layer composite structure of the furnace door and the centralized arrangement of cooling pipes result in a compact and integrated overall structure, adapting to the equipment layout requirements of carbon fiber production lines. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the cooling and sealing door structure of the carbon fiber oxidation furnace described in this utility model; Figure 2 This is a partially enlarged structural diagram of the liquid inlet and return pipe connector of this utility model; Figure 3 This is a top cross-sectional view of the cooling and sealing door of the carbon fiber oxidation furnace described in this utility model; Figure 4 This is a structural diagram of the internal liquid channel of the cooling circulation structure described in this utility model; Figure 5 This is a structural diagram of the furnace door described in this utility model.

[0020] Attached Figure

[0021] 1. Furnace door; 1-1. Inner door insulator; 1-2. Furnace door pressure plate; 1-3. Outer door body; 2. Rocker arm; 3. Rocker arm seat; 4. Handwheel; 5. Pressure plate; 6. Locking block; 7. Liquid inlet pipe connector; 71. Internal threaded liquid inlet pipe; 8. Liquid return pipe connector; 81. Internal threaded liquid return pipe; 9. Liquid inlet spiral pipe; 10. Liquid return spiral pipe; 11. High-temperature resistant sealing rope; 12. O-ring seal.

[0022] H, Cooling circulation structure; H1, Cooling unit; H2, Recirculation unit; A, First sealing surface; B, Second sealing surface; C, Dovetail groove. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] It should be noted that similar labels 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.

[0025] 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 is in use. They are only for the convenience of describing the present invention 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. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] 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.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly 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 utility model based on the specific circumstances.

[0028] Specifically, in this invention, radial direction refers to the radial direction passing through the center of the circle (or the center of the rotation axis), which is a straight line direction from the center to the edge or from the edge to the center. Axial direction refers to the direction along the rotation axis (or central axis) of the object, which is a straight line direction parallel to the rotation axis.

[0029] Please see Figures 1 to 5 This embodiment provides a cooling and sealing door for a carbon fiber oxidation furnace.

[0030] The rocker arm seat 3 is symmetrically fixed to the oxidation furnace wall. The rocker arm 2 is rotatably connected to the rocker arm seat 3 via a rotating shaft / rotating bolt. The rocker arm 2 is also movably assembled with the outer door 1-3, forming a four-bar linkage rotation structure of "wall-rocker arm seat-rocker arm-outer door". When opening: Rotate the rocker arm 2 outward, and the rocker arm drives the outer door 1-3 to flip outward simultaneously. The inner door insulating body 1-1 disengages from the wall embedding part, and the furnace door pressure plate 1-2 separates from the outer wall, completing the opening action. When closing: Rotate the rocker arm 2 in the opposite direction, so that the inner door insulating body 1-1 is precisely embedded in the oxidation furnace wall, and the furnace door pressure plate 1-2 is tightly fitted to the outer wall, providing a basic positioning for subsequent sealing and locking.

[0031] The furnace employs four sets of vertically distributed handwheel-type locking components: handwheels 4, locking blocks 6, and pressure plates 5. Through mechanical coordination, uniform force is applied to the sealing surfaces. After closing the furnace door, the connecting rod of each handwheel 4 is engaged into the groove of the pressure plate 5 on the corresponding outer door body 1-3. Rotating the rotating part of the handwheel 4 utilizes the lever principle. The locking block 6, fixed to the wall, provides a fulcrum, and the handwheel drives the pressure plate 5 to press the furnace door against the wall. The four components apply force synchronously, ensuring uniform contact between the first sealing surface A and the second sealing surface B, as well as between the inner door body bending plate and the high-temperature resistant sealing rope 11, preventing sealing failure due to insufficient local pressure.

[0032] The sealing structure operates according to the logic of inner high-temperature barrier + outer secondary protection, adapting to the high-temperature positive pressure environment inside the furnace: Second sealing structure: After the furnace door is locked, the annular bending plate on the inner side of the inner partition door body 1-1 squeezes the high-temperature resistant sealing rope 11 of the wall mating part. The sealing rope undergoes uniform deformation and fills the gap, directly preventing the high-temperature gas inside the furnace containing toxic and harmful substances and heat from penetrating outward, forming the first core barrier, adapting to the high-temperature working conditions of the oxidation furnace; First sealing structure: Simultaneously, the second sealing surface B of the furnace door pressure plate 1-2 fits with the first sealing surface A of the outer wall of the wall, and the O-ring 12 limited by the dovetail groove C is squeezed and filled into the gap, preventing a small amount of gas that may break through the inner layer from further overflowing, forming a double insurance, solving the problems of incomplete sealing and positive pressure leakage of traditional single packing.

[0033] The cooling circulation structure H operates through a fluid buffering-high-efficiency heat exchange-centralized reflux path, simultaneously achieving three major functions: furnace door cooling, seal protection, and sealing surface stabilization. Cooling start-up: External cooling water enters through the inlet pipe joint 7, first passing through the inlet spiral pipe 9 for buffering. The spiral structure reduces water flow impact, avoiding uneven heat exchange caused by flow velocity fluctuations. Subsequently, it flows through the internally threaded inlet pipe 71 into the S-shaped cooling unit H1 within the outer door body 1-3. High-efficiency heat exchange: The S-shaped channel extends the water flow path and expands the heat exchange area within a limited space, and the channel projection covers the first sealing structure, allowing the cooling water to fully absorb heat. The process of collecting heat from the furnace door, especially the door pressure plates 1-2 and sealing surfaces A / B, serves two purposes: firstly, it reduces the surface temperature of the outer door to prevent burns to operators; secondly, it cools the O-ring seal 12 and high-temperature resistant sealing rope 11, slowing down aging and carbonization; and thirdly, it reduces the deformation of the sealing surface caused by high temperatures, maintaining flatness and enhancing the sealing performance after locking. The cooling water after heat exchange flows from the end point of cooling unit H1 into the coplanar return unit H2, further stabilizing the flow through the internally threaded return pipe 81 and the return spiral pipe 10, and finally exits through the return pipe joint 8, completing the circulation. Because the starting point of cooling unit H1 is close to the end point of return unit H2, the inlet / return pipe joints are centrally arranged on the outer door surface to avoid cluttered piping, reduce fluid resistance, and ensure circulation efficiency.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cooling and sealing door for a carbon fiber oxidation furnace, characterized in that: include; Furnace door (1), rocker arm (2), rocker arm seat (3), liquid inlet pipe connector (7), liquid return pipe connector (8), locking assembly, first sealing structure, second sealing structure, cooling circulation structure (H); The furnace door (1) includes an inner door insulator (1-1), a furnace door pressure plate (1-2), and an outer door body (1-3). The furnace door pressure plate (1-2) is installed on the inner side of the outer door body (1-3), and the inner door insulator (1-1) is installed on the inner side of the furnace door pressure plate (1-2). The rocker arm seat (3) is fixed on the wall. The rocker arm (2) is rotatably connected to the rocker arm seat (3). The rocker arm seat (3) is movably connected to the outer door body (1-3). The first component of the locking assembly is set on the wall, and the second component is set on the outer door body (1-3). The first component and the second component cooperate. The cooling circulation structure (H) is set inside the outer door body (1-3). The liquid inlet pipe connector (7) and the liquid return pipe connector (8) are respectively connected to the liquid inlet end and the liquid return end of the cooling circulation structure (H). A first sealing structure is set between the outer wall of the wall and the furnace door pressure plate (1-2). A second sealing structure is set between the inner side of the inner door body (1-1) and the wall. The cooling circulation structure (H) is projected to cover the first sealing structure.

2. The cooling and sealing door of the carbon fiber oxidation furnace according to claim 1, characterized in that: The locking assembly includes a first component and a second component. The first component includes a handwheel (4) and a locking block (6). The second component includes a pressure plate (5). The locking block (6) is fixed to the wall. The handwheel (4) is movably fixed to the locking block (6). The pressure plate (5) is fixed to the outer door body (1-3). The handwheel (4) cooperates with the pressure plate (5).

3. The cooling and sealing door of the carbon fiber oxidation furnace according to claim 2, characterized in that: It also includes an internal threaded liquid inlet pipe (71) and an internal threaded liquid return pipe (81). The internal threaded liquid inlet pipe (71) is located on the surface of the outer door body (1-3) and connected to the liquid inlet end of the cooling circulation structure (H). The internal threaded liquid return pipe (81) is located on the surface of the outer door body (1-3) and connected to the liquid return end of the cooling circulation structure (H). The liquid inlet pipe connector (7) is connected to the internal threaded liquid inlet pipe (71), and the liquid return pipe connector (8) is connected to the internal threaded liquid return pipe (81).

4. The cooling and sealing door of the carbon fiber oxidation furnace according to claim 3, characterized in that: It also includes an inlet spiral tube (9) and a return spiral tube (10). The inlet spiral tube (9) is connected to the inlet pipe connector (7), and the return spiral tube (10) is connected to the return pipe connector (8).

5. The cooling and sealing door of the carbon fiber oxidation furnace according to claim 1, characterized in that: The first sealing structure is set between the outer wall of the wall and the furnace door pressure plate (1-2). A first sealing surface (A) is set on the outer wall of the wall, and a second sealing surface (B) is set on the inner side of the furnace door pressure plate (1-2). A dovetail groove (C) is opened on the second sealing surface (B), and an O-ring (12) is embedded in the dovetail groove (C). The first sealing surface (A) and the second sealing surface (B) are matched.

6. The cooling and sealing door of the carbon fiber oxidation furnace according to claim 1, characterized in that: The second sealing structure is provided between the inner side of the inner door body (1-1) and the wall mating part. A bending plate is provided on the inner side of the inner door body (1-1), and a high-temperature resistant sealing rope (11) is provided on the wall mating part. The bending plate and the high-temperature resistant sealing rope (11) are matched in position.

7. The cooling and sealing door of the carbon fiber oxidation furnace according to claim 3, characterized in that: The cooling circulation structure (H) includes a cooling unit (H1) and a reflux unit (H2). The cooling unit (H1) is an S-shaped liquid channel in the same plane. The internally threaded liquid inlet pipe (71) is connected to the starting point of the liquid channel of the cooling unit (H1). The reflux unit (H2) is a liquid channel in the same plane as the cooling unit (H1). The starting point of the liquid channel of the reflux unit (H2) is connected to the ending point of the liquid channel of the cooling unit (H1). The internally threaded liquid return pipe (81) is connected to the ending point of the liquid channel of the reflux unit (H2).

8. The cooling and sealing door of the carbon fiber oxidation furnace according to claim 7, characterized in that: The starting point of the liquid channel of the cooling unit (H1) is close to the ending point of the liquid channel of the reflux unit (H2).

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