A lignin-based carbon fiber preheating device prepared by electrospinning

Abstract

The utility model relates to carbon fiber preheating treatment technical field discloses a static electrospinning method preparation lignin base carbon fiber preheating treatment device, including box, inner housing, fiber membrane placing net, preheating mechanism and ventilation mechanism, the control system and temperature controller are installed on the box, the inner housing is installed on the inner wall of box through the support, and the interval is established between inner housing outer wall and box inner wall, and the ventilation assembly is set up on the side wall of inner housing, the fiber membrane placing net is detachably connected on the inner wall of inner housing, the preheating mechanism includes heating assembly and temperature and humidity monitoring component, and heating assembly and temperature and humidity monitoring component all install on the outer wall of inner housing, the ventilation mechanism includes air supply component and exhaust component, and air supply component and exhaust component all install on the box, the utility model can realize the high accuracy control of temperature and humidity, can also discharge the volatile substance produced in preheating in time, ensures that the fiber membrane each area is heated consistently, provides the structural stable fiber membrane base material for subsequent carbonization process.

Description

Technical Field

[0001] This utility model relates to the field of carbon fiber preheating technology, and in particular to a preheating device for preparing lignin-based carbon fibers by electrospinning. Background Technology

[0002] Lignin-based carbon fibers, with their advantages of wide availability of raw materials, low cost, and environmental friendliness, have broad application prospects in composite materials, filtration materials, and other fields. Their preparation typically involves electrospinning to first form a lignin-based fiber membrane, followed by preheating, carbonization, and other subsequent processes. Preheating is a crucial step, requiring precise control of temperature, humidity, and airflow to remove volatiles from the fiber membrane and improve fiber structural stability, laying the foundation for subsequent carbonization. Defects in the preheating process can easily lead to cracking, adhesion, or uneven performance of the fiber membrane, directly affecting the quality of the final carbon fiber product. Existing preheating devices for lignin-based fiber membranes have several shortcomings. First, the temperature and humidity control accuracy is low. Lignin is sensitive to temperature and humidity; excessive humidity can easily cause the fiber membrane to stick together, and excessive temperature fluctuations can damage the fiber's microstructure. Existing devices often lack real-time monitoring and dynamic adjustment capabilities, making it difficult to maintain a stable preheating environment. Second, the ventilation system is poorly designed. During the preheating process, the fiber membrane releases volatile substances, which, if not discharged in time, will adhere to the surface of the fiber membrane and affect its performance.

[0003] To address this, a preheating device for preparing lignin-based carbon fibers using electrospinning is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a preheating treatment device for preparing lignin-based carbon fibers by electrospinning, which aims to solve or improve at least one of the above-mentioned technical problems.

[0005] To achieve the above objectives, this utility model provides the following solution: This utility model provides a preheating treatment device for preparing lignin-based carbon fibers by electrospinning, comprising: The enclosure is equipped with a control system and a temperature controller. The inner shell is mounted on the inner wall of the box body by a bracket. There is a gap between the outer wall of the inner shell and the inner wall of the box body. A ventilation component is provided on the side wall of the inner shell. A fiber membrane placement net, which is detachably connected to the inner wall of the inner shell; A preheating mechanism, comprising a heating component and a temperature and humidity monitoring component, wherein both the heating component and the temperature and humidity monitoring component are mounted on the outer wall of the inner shell; A ventilation mechanism, comprising an air supply component and an exhaust component, both of which are mounted on the housing. The air supply component is connected to the inner cavity of the inner shell, and the exhaust component is connected to the partition. Both the outer casing and the inner shell are detachably connected to a door. The heating component is electrically connected to the control system via the thermostat. The temperature and humidity monitoring component, the thermostat, the air supply component, and the exhaust component are all electrically connected to the control system.

[0006] According to the present invention, a preheating treatment device for preparing lignin-based carbon fiber by electrospinning is provided. The ventilation component includes two ventilation windows arranged side by side. Both ventilation windows are opened on the side wall of the inner shell. A ventilation fan is installed in the ventilation window. The exhaust assembly includes an exhaust fan installed on the top of the housing. The exhaust fan is electrically connected to the control system. An exhaust pipe is installed at the air inlet end of the exhaust fan and extends into the interval.

[0007] According to the present invention, a preheating treatment device for preparing lignin-based carbon fiber by electrospinning is provided. The air supply component includes an air inlet pipe installed on the top of the housing. One end of the air inlet pipe is connected to an air intake fan, which is electrically connected to the control system. Two branch pipes are installed at the end of the air inlet pipe away from the air intake fan. Both branch pipes are connected to the air inlet pipe. The ends of the branch pipes away from the air inlet pipe are fixedly connected to and connected to the inner shell.

[0008] According to the present invention, a preheating treatment device for preparing lignin-based carbon fibers by electrospinning is provided. The temperature and humidity monitoring component includes a temperature sensor and a humidity sensor. The detection ends of the temperature sensor and the humidity sensor both extend into the inner cavity of the inner shell. The temperature sensor and the humidity sensor are both electrically connected to the control system.

[0009] According to the present invention, a preheating treatment device for preparing lignin-based carbon fibers by electrospinning is provided. The heating component includes a side wall heating sleeve and a bottom heating sleeve. The side wall heating sleeve is installed on the outer side wall of the inner shell, and the bottom heating sleeve is installed on the bottom of the inner shell. Both the side wall heating sleeve and the bottom heating sleeve are equipped with heating wires, and the heating wires are electrically connected to the control system through the temperature controller.

[0010] According to the present invention, a preheating treatment device for preparing lignin-based carbon fiber by electrospinning is provided, wherein support blocks are installed on the two opposite inner sidewalls of the inner shell, and slots are opened on the support blocks; and slots are installed on both sides of the fiber membrane placement net, and the two slots are respectively engaged with the two slots.

[0011] According to the present invention, a preheating treatment device for preparing lignin-based carbon fibers by electrospinning is provided, wherein an insulation layer is installed on the outer wall of the box.

[0012] According to the present invention, a preheating treatment device for preparing lignin-based carbon fibers by electrospinning is provided, wherein several legs are installed at the bottom of the box.

[0013] The present invention discloses the following technical effects: This invention features an intermittent structure formed by the inner shell and the box body, with the heating component installed on the outer wall of the inner shell, enabling uniform heat conduction within the inner shell cavity. Simultaneously, the fiber membrane placement net is detachably connected to the inner wall of the inner shell, facilitating the flat placement of the lignin-based fiber membrane obtained by electrospinning, avoiding fiber membrane stacking or local shading, ensuring consistent heating across all areas of the fiber membrane, effectively reducing problems such as fiber shrinkage and cracking, and performance differences caused by uneven heating, and providing a structurally stable fiber membrane substrate for subsequent carbonization processes. This invention delivers clean airflow into the inner cavity of the inner shell through an air supply component and promptly removes volatile substances generated during preheating through an exhaust component, preventing them from adhering to the fiber membrane or polluting the environment. A temperature and humidity monitoring component collects real-time temperature and humidity data from the inner shell cavity and transmits it to the control system. The control system, in conjunction with a thermostat, adjusts the heating power of the heating component to precisely control the preheating temperature. Simultaneously, it coordinates the operation of the air supply and exhaust components to balance the humidity within the inner shell cavity, improving the accuracy of temperature and humidity control and preventing damage to the lignin fiber membrane structure due to temperature and humidity fluctuations, thus ensuring the stability and consistency of the preheating process. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the box in this utility model.

[0016] The components include: 1. Cabinet; 2. Control system; 3. Temperature controller; 4. Inner shell; 5. Spacing; 6. Fiber membrane placement net; 7. Cabinet door; 8. Ventilation fan; 9. Exhaust fan; 10. Exhaust pipe; 11. Inlet pipe; 12. Branch pipe; 13. Temperature sensor; 14. Humidity sensor; 15. Side wall heating sleeve; 16. Bottom heating sleeve; 17. Support block; 18. Locking block; 19. Insulation layer; 20. Support legs. Detailed Implementation

[0017] 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.

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Reference Figures 1-2 This utility model provides a preheating treatment device for preparing lignin-based carbon fibers by electrospinning, comprising: Box 1, on which a control system 2 and a temperature controller 3 are installed; The inner shell 4 is mounted on the inner wall of the box 1 by a bracket. There is a gap 5 between the outer wall of the inner shell 4 and the inner wall of the box 1. An air exchange component is provided on the side wall of the inner shell 4. The fiber membrane placement net 6 is detachably connected to the inner wall of the inner shell 4; the fiber membrane placement net 6 is made of stainless steel. The preheating mechanism includes a heating component and a temperature and humidity monitoring component, both of which are installed on the outer wall of the inner shell 4. The ventilation mechanism includes an air supply component and an exhaust component. Both the air supply component and the exhaust component are installed on the housing 1. The air supply component is connected to the inner cavity of the inner shell 4, and the exhaust component is connected to the partition 5. The cabinet body 1 and the inner shell 4 are detachably connected to the cabinet door 7. The heating component is electrically connected to the control system 2 through the thermostat 3. The temperature and humidity monitoring component, the thermostat 3, the air supply component and the exhaust component are all electrically connected to the control system 2. With this configuration, the present invention forms an interval structure between the inner shell 4 and the box 1, and the heating component is installed on the outer wall of the inner shell 4, which can achieve uniform heat conduction in the inner cavity of the inner shell 4; at the same time, the fiber membrane placement net 6 is detachably connected to the inner wall of the inner shell 4, which facilitates the flat placement of the lignin-based fiber membrane obtained by electrospinning, avoids fiber membrane stacking or local shading, ensures that the fiber membrane is heated evenly in all areas, effectively reduces problems such as fiber shrinkage and cracking and performance differences caused by uneven heating, and provides a structurally stable fiber membrane substrate for the subsequent carbonization process; This invention delivers clean airflow into the inner cavity of the inner shell 4 through an air supply component and promptly removes volatile substances generated during preheating through an exhaust component, preventing them from adhering to the fiber membrane or polluting the environment. The temperature and humidity monitoring component can collect temperature and humidity data of the inner cavity of the inner shell 4 in real time and transmit it to the control system 2. The control system 2, in conjunction with the thermostat 3, adjusts the heating power of the heating component to accurately control the preheating temperature. At the same time, it coordinates the operation of the air supply component and the exhaust component to balance the humidity inside the inner shell 4, improving the accuracy of temperature and humidity control, preventing damage to the lignin fiber membrane structure due to temperature and humidity fluctuations, and ensuring the stability and consistency of the preheating process.

[0020] The design is further optimized so that the ventilation component includes two ventilation windows arranged side by side. Both ventilation windows are opened on the side wall of the inner shell 4, and ventilation fans 8 are installed in the ventilation windows. The ventilation fans 8 adopt a partition with several ventilation holes. The exhaust assembly includes an exhaust fan 9 installed on the top of the housing 1. The exhaust fan 9 is electrically connected to the control system 2. An exhaust pipe 10 is installed at the air inlet end of the exhaust fan 9 and extends into the partition 5. The exhaust end of the exhaust fan 9 is connected to a hazardous substance treatment device. When the exhaust fan 9 is started, it extracts the hot air and harmful substances volatilized during the preheating process from the space between the outer wall of the inner shell 4 and the inner wall of the box 1 through the exhaust pipe 10 that extends into the space 5.

[0021] The design is further optimized. The air supply component includes an air inlet pipe 11 installed on the top of the housing 1. One end of the air inlet pipe 11 is connected to an air intake fan, which is electrically connected to the control system 2. Two branch pipes 12 are installed at the end of the air inlet pipe 11 away from the air intake fan. Both branch pipes 12 are connected to the air inlet pipe 11. The end of the branch pipe 12 away from the air inlet pipe 11 is fixedly connected to and connected to the inner shell 4. An air distribution structure is installed inside the branch pipe 12 to reduce the impact of airflow on the lignin-based fiber membrane. The dual-branch pipe 12 can avoid local airflow concentration caused by a single air intake, so that the clean airflow is evenly distributed in the inner cavity of the inner shell 4. On the one hand, it provides a stable airflow environment for the preheating of the lignin-based fiber membrane, reducing the shaking of the fiber membrane or excessively rapid local drying caused by uneven airflow; on the other hand, it helps to regulate the humidity of the inner cavity and maintain the temperature and humidity balance.

[0022] The scheme is further optimized. The temperature and humidity monitoring component includes a temperature sensor 13 and a humidity sensor 14. The detection ends of the temperature sensor 13 and the humidity sensor 14 both extend into the inner cavity of the inner shell 4. The temperature sensor 13 and the humidity sensor 14 are both electrically connected to the control system 2. The control system 2 adopts a PLC or a microcontroller, and the temperature controller 3 adopts a CN616 series PID temperature controller.

[0023] The heating assembly is further optimized by including a side wall heating sleeve 15 and a bottom heating sleeve 16. The side wall heating sleeve 15 is installed on the outer side wall of the inner shell 4, and the bottom heating sleeve 16 is installed on the bottom of the inner shell 4. Both the side wall heating sleeve 15 and the bottom heating sleeve 16 are equipped with heating wires, and the heating wires are electrically connected to the control system 2 through the temperature controller 3. When the control system 2 issues a heating command, the temperature controller 3 adjusts the current of the heating wire to control the heating power. The side wall heating sleeve 15 heats from all sides of the inner shell 4, while the bottom heating sleeve 16 conducts heat upwards from the bottom of the inner shell 4, forming a three-dimensional heating mode of "all sides + bottom," avoiding uneven temperature distribution within the inner shell 4 caused by heating from only one direction. Heat is evenly conducted to the inner cavity through the wall of the inner shell 4, ensuring uniform heating of all areas of the lignin-based fiber membrane on the fiber membrane placement mesh 6. This reduces fiber shrinkage and cracking caused by localized overheating, ensuring the structural stability of the fiber membrane after preheating and laying the foundation for subsequent carbonization processes.

[0024] The design is further optimized by installing support blocks 17 on the two opposite inner sidewalls of the inner shell 4. The support blocks 17 have slots. The fiber membrane placement net 6 has locking blocks 18 on both sides, and the two locking blocks 18 are respectively engaged with the two slots. This not only achieves the stable installation of the fiber membrane placement net 6, but also facilitates loading and unloading. At the same time, it ensures that the fiber membrane placement net 6 is placed horizontally, avoiding the stacking of fiber membranes due to the tilt of the placement net, and further ensuring that the fiber membrane is heated evenly.

[0025] Further optimization of the design involves installing an insulation layer 19 on the outer wall of the enclosure 1. The insulation layer 19 is made of heat insulation material, which can effectively block the heat exchange between the inside and outside of the enclosure 1.

[0026] The design has been further optimized, with several support legs 20 installed at the bottom of the housing 1.

[0027] Further optimization of the design: a high-temperature resistant industrial camera electrically connected to the control system 2 is installed on the top of the inner shell 4. The high-temperature resistant industrial camera has infrared thermal imaging function and can capture the surface condition of the fiber membrane in real time (such as surface color, whether it has shrunk, cracked). Infrared thermal imaging can detect the temperature distribution on the surface of the fiber membrane.

[0028] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 this utility model.

[0029] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. For those skilled in the art, other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A preheating treatment apparatus for preparing lignin-based carbon fibers by electrospinning, characterized in that, include: The housing (1) is equipped with a control system (2) and a temperature controller (3). The inner shell (4) is mounted on the inner wall of the box (1) by a bracket. A gap (5) is provided between the outer wall of the inner shell (4) and the inner wall of the box (1). An air exchange component is provided on the side wall of the inner shell (4). A fiber membrane placement net (6) is detachably connected to the inner wall of the inner shell (4); The preheating mechanism includes a heating component and a temperature and humidity monitoring component, both of which are installed on the outer wall of the inner shell (4). The ventilation mechanism includes an air supply component and an exhaust component. The air supply component and the exhaust component are both installed on the housing (1). The air supply component is connected to the inner cavity of the inner shell (4), and the exhaust component is connected to the partition (5). The box body (1) and the inner shell (4) are detachably connected to the box door (7). The heating component is electrically connected to the control system (2) through the thermostat (3). The temperature and humidity monitoring component, the thermostat (3), the air supply component and the exhaust component are all electrically connected to the control system (2).

2. The preheating treatment apparatus for preparing lignin-based carbon fibers by electrospinning according to claim 1, characterized in that: The ventilation assembly includes two ventilation windows arranged side by side, both of which are opened on the side wall of the inner shell (4), and a ventilation fan (8) is installed in the ventilation window. The exhaust assembly includes an exhaust fan (9) installed on the top of the housing (1), the exhaust fan (9) being electrically connected to the control system (2), and an exhaust pipe (10) installed at the air inlet end of the exhaust fan (9), the exhaust pipe (10) extending into the interval (5).

3. The preheating treatment apparatus for preparing lignin-based carbon fibers by electrospinning according to claim 1, characterized in that: The air supply assembly includes an air inlet pipe (11) installed on the top of the housing (1). One end of the air inlet pipe (11) is connected to an air intake fan. The air intake fan is electrically connected to the control system (2). Two branch pipes (12) are installed at the end of the air inlet pipe (11) away from the air intake fan. Both branch pipes (12) are connected to the air inlet pipe (11). The end of the branch pipe (12) away from the air inlet pipe (11) is fixedly connected to and connected to the inner shell (4).

4. The preheating treatment apparatus for preparing lignin-based carbon fibers by electrospinning according to claim 1, characterized in that: The temperature and humidity monitoring component includes a temperature sensor (13) and a humidity sensor (14). The probe ends of the temperature sensor (13) and the humidity sensor (14) are both inserted into the inner cavity of the inner shell (4). The temperature sensor (13) and the humidity sensor (14) are both electrically connected to the control system (2).

5. The preheating treatment apparatus for preparing lignin-based carbon fibers by electrospinning according to claim 1, characterized in that: The heating assembly includes a side wall heating sleeve (15) and a bottom heating sleeve (16). The side wall heating sleeve (15) is installed on the outer side wall of the inner shell (4), and the bottom heating sleeve (16) is installed on the bottom of the inner shell (4). Both the side wall heating sleeve (15) and the bottom heating sleeve (16) are equipped with heating wires, and the heating wires are electrically connected to the control system (2) through the temperature controller (3).

6. The preheating treatment apparatus for preparing lignin-based carbon fibers by electrospinning according to claim 1, characterized in that: Support blocks (17) are installed on the two inner sidewalls opposite to each other of the inner shell (4). The support blocks (17) have slots. The fiber membrane placement net (6) has two locking blocks (18) installed on both sides. The two locking blocks (18) are respectively engaged with the two slots.

7. The preheating treatment apparatus for preparing lignin-based carbon fibers by electrospinning according to claim 1, characterized in that: An insulation layer (19) is installed on the outer wall of the box (1).

8. The preheating treatment apparatus for preparing lignin-based carbon fibers by electrospinning according to claim 1, characterized in that: The bottom of the box (1) is equipped with several support legs (20).

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