A device for spinning pitch-based carbon fiber

Abstract

The utility model discloses an asphalt base carbon fiber spinning preparation device, including controller, electric heater, temperature sensor, first electromagnetic valve and pressure sensor, electric heater, temperature sensor, first electromagnetic valve and pressure sensor all with controller electric nature coupling, through adopting coaxial setting but the first stirring device and second stirring device of stirring radius dislocation, especially when both reverse rotation, can form complicated and efficient shear flow field in the kettle body. The first stirring rod and second stirring rod of dislocation arrangement are like intermeshing, and the material is carried out all -round cutting and kneading, and thoroughly eliminates the mixing dead angle, ensures the uniformity of material at molecular level, and significantly improves the mixing efficiency and quality.

Description

Technical Field

[0001] This utility model relates to an apparatus for preparing pitch-based carbon fiber spinning. Background Technology

[0002] Pitch-based carbon fibers have shown great application potential in high-end thermal management, aerospace and other fields due to their excellent thermal and electrical conductivity and low cost. One of the key steps in their preparation process is to melt, homogenize and degas the mesophase pitch or pretreated pitch raw materials under specific conditions to prepare a pitch melt with highly uniform composition and viscosity that can be spun.

[0003] Currently, most commonly used asphalt mixing equipment employs single-shaft mixing reactors. This type of equipment has significant drawbacks: First, single-shaft mixing easily creates mixing dead zones, making it difficult to ensure uniform mixing across the entire material under complex rheological properties; second, high-temperature asphalt easily adheres to the reactor wall, not only wasting raw materials and affecting the accuracy of the proportions, but also contaminating subsequent batches of material due to carbonization of residues, thus affecting product quality; third, traditional mixing methods generate limited shear force on the material, making it difficult to efficiently break up gel clumps in the asphalt, resulting in low mixing efficiency.

[0004] Therefore, there is an urgent need in the field for a pitch-based carbon fiber spinning preparation device that can achieve efficient and uniform mixing and effectively prevent material adhesion residues. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a pitch-based carbon fiber spinning preparation device that can achieve efficient and uniform mixing and effectively prevent material adhesion residue.

[0006] To solve the above problems, the present invention adopts the following technical solution:

[0007] A pitch-based carbon fiber spinning preparation apparatus includes a controller, an electric heater, a temperature sensor, a first solenoid valve, and a pressure sensor. The electric heater, temperature sensor, first solenoid valve, and pressure sensor are all electrically connected to the controller. The apparatus also includes:

[0008] The vessel body is cylindrical, with flat left and right end faces and a circular outer surface. An installation pipe is located at the top of the outer surface, and a maintenance cover is detachably installed at the pipe opening. A pressure sensor is mounted on the maintenance cover, with its sensing end located inside the cover to detect the internal pressure of the vessel body. An outlet pipe is located at the bottom of the outer surface, with a first solenoid valve installed at its lower end. A temperature sensor and a heater are installed on the side of the outlet pipe. A connecting pipe is located on the side of the maintenance cover, through which a tee pipe is installed. Second solenoid valves are installed at the remaining two passages of the tee pipe, one for connecting to a vacuum device and the other for connecting to a pressurizing device. A feeding pipe is located at the top of the side of the vessel body, and a sealing cover is detachably installed at the feeding pipe.

[0009] A first stirring device and a second stirring device are respectively installed on the left and right end faces of the vessel body, and the first stirring device, the second stirring device and the vessel body are coaxially arranged, with the first stirring device and the second stirring device arranged alternately.

[0010] Preferably, the first stirring device includes a first stirring motor, a first stirring shaft, and a first stirring body. The first stirring shaft is rotatably mounted at the center of the left end face of the vessel body. The first stirring motor is fixedly mounted to the vessel body, and the output end of the first stirring motor is connected and fixedly connected to the first stirring shaft. The first stirring body is mounted on the end of the first stirring shaft away from the first stirring motor. The first stirring body rotates inside the vessel body. The first stirring motor is driven by the controller.

[0011] Preferably, the second stirring device includes a second stirring motor, a second stirring shaft, and a second stirring body. The second stirring shaft is installed at the center of the right end face of the vessel and is coaxial with the first stirring shaft. The second stirring motor is installed at the center of the right end of the vessel. The output end of the second stirring motor is connected and fixed to the second stirring shaft. The second stirring body is installed at the end of the second stirring shaft away from the second stirring motor.

[0012] Preferably, the first stirring body includes a first connecting plate, a first scraper annularly disposed on the outer wall of the first connecting plate, and a circumferential scraper vertically disposed at the end of the first scraper. The first scraper acts on the inner left end face of the vessel body, and the circumferential scraper acts on the inner circumferential surface of the vessel body. The first connecting plate is fixed to the first stirring shaft. Multiple first stirring rods are disposed at the end of the first scraper facing the center of the vessel body. The second stirring body includes a second connecting plate, and a second scraper annularly disposed on the outer wall of the second connecting plate. The second scraper acts on the inner right end face of the vessel body. Multiple second stirring rods are disposed at the end of the second scraper facing the first scraper. The first stirring rod and the second stirring rod are misaligned. Both the first stirring rod and the second stirring rod are parallel to the axis of the vessel body. The end of the second scraper away from the second connecting plate is separated from the circumferential scraper.

[0013] Preferably, the first stirring rod is prismatic and has two cutting edges, which cut the asphalt material when the first stirring rod rotates.

[0014] Preferably, the outer end face of the circumferential scraper is an arc-shaped surface, which fits against the inner wall of the vessel body.

[0015] Preferably, the second stirring rod is a circular rod.

[0016] The beneficial effects of this utility model are:

[0017] By employing a first and second stirring device arranged coaxially but with offset stirring radii, especially when they rotate in opposite directions, a complex and efficient shear flow field can be formed within the vessel. The offset arrangement of the first and second stirring rods acts like mutual meshing, cutting and kneading the material from all directions, completely eliminating mixing dead zones, ensuring the uniformity of the material at the molecular level, and significantly improving mixing efficiency and quality.

[0018] An innovative design incorporates a first and second agitator specifically for scraping the vessel walls. The circumferential scraper of the first agitator fits tightly against the inner circumferential wall of the vessel, while the first and second scrapers cover the left and right end faces of the vessel, respectively. The three components work together to achieve near 100% physical scraping of the inner wall of the vessel. This fundamentally solves the problem of high-temperature asphalt sticking to the walls, ensures accurate proportioning of each batch of material, avoids contamination caused by carbonization of residues, and greatly simplifies cleaning and maintenance. Attached Figure Description

[0019] 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 of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a cross-sectional view of the device;

[0022] Figure 3 This is a side view of the first stirring element;

[0023] Figure 4 This is a side view of the second mixing element.

[0024] 1. Electric heater; 2. Temperature sensor; 3. First solenoid valve; 4. Pressure sensor; 5. Kettle body; 51. Mounting pipe; 52. Inspection cover; 53. Outlet pipe; 54. Connecting pipe; 55. T-connector; 56. Second solenoid valve; 57. Feeding pipe; 58. Sealing cover; 6. First stirring device; 61. First stirring motor; 62. First stirring body; 620. First connecting plate; 621. First scraper; 622. Circumferential scraper; 623. First stirring rod; 724. Second stirring device; 71. Second stirring motor; 72. Second stirring body; 720. Second connecting plate; 721. Second scraper; 722. Second stirring rod, with a cutting edge of 7220. Detailed Implementation

[0025] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0026] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0027] In the description of this utility model, it should be understood that the terms "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model 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 this utility model.

[0028] Furthermore, in the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "set," "socket," "connect," "through," and "plug-in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] See Figure 1 The apparatus shown is for preparing pitch-based carbon fiber spinning, including a controller (not shown), an electric heater 1, a temperature sensor 2, a first solenoid valve 3, and a pressure sensor 4. The electric heater 1, temperature sensor 2, first solenoid valve 3, and pressure sensor 4 are all electrically connected to the controller. The controller is a conventional PLC controller. The apparatus also includes:

[0031] The vessel body 5 is cylindrical, with flat left and right end faces and a circular outer surface. An installation pipe 51 is positioned at the top of the outer surface of the vessel body 5. A maintenance cover 52 is detachably installed at the opening of the installation pipe 51, and is bolted to the cover. A sealing ring is installed at the connection point between the cover and the installation pipe 51 to enhance sealing. A pressure sensor 4 is mounted on the maintenance cover 52, with its sensing end located inside the cover to detect the internal pressure of the vessel body 5. Using a top-mounted pressure sensor 4 avoids direct contact between the sensor and the high-temperature asphalt liquid. An outlet pipe 53 is positioned at the bottom of the outer surface of the vessel body 5, and the first solenoid valve 3 is installed on the outlet pipe. At the lower end of 53, the temperature sensor 2 and the heater 1 are installed on the side of the outlet pipe 53; the side-mounted temperature sensor 2 and electric heater 1 are used to avoid affecting the flow of asphalt liquid. It should be noted that when the equipment is stopped, the electric heater 1 needs to continue to run until the equipment cleaning is completed; a connecting pipe 54 is provided on the side of the inspection cover 52, and a three-way pipe 55 is installed through the connecting pipe 54. A second solenoid valve 56 is installed at the remaining two passage positions of the three-way pipe 55. One second solenoid valve 56 is used to connect to the vacuum equipment, and the other second solenoid valve is used to connect to the pressurization equipment; a feeding pipe 57 is provided at the top position of the side of the vessel body 5, and a sealing cover 58 is detachably installed at the feeding pipe 57;

[0032] In the above technical solution, the second solenoid valve 56 can be connected to a vacuum pump and a pressurizing device, depending on the mixing requirements, and one of them can be used.

[0033] A first stirring device 6 and a second stirring device 7 are respectively installed on the left and right end faces of the vessel body 5, and the first stirring device 6, the second stirring device 7 and the vessel body 5 are coaxially arranged, with the first stirring device 6 and the second stirring device 7 arranged in an alternating manner.

[0034] In the above technical solution, the main function of the first stirring device 6 is to scrape off the asphalt material adhering to the inner circumferential wall of the vessel body 5. Secondly, it has a stirring function.

[0035] The function of the second stirring device 7 is to stir.

[0036] In the above technical solution, the staggered arrangement method is used to address the motion interference problem of the first stirring device 6 and the second stirring device 7.

[0037] To enhance the mixing effect, the rotation directions of the first mixing device 6 and the second mixing device 7 can be set to opposite directions to generate shear force.

[0038] See Figure 2 , Figure 3 and Figure 4 As shown, the first stirring device 6 includes a first stirring motor 61, a first stirring shaft (not shown), and a first stirring body 62. The first stirring shaft is rotatably mounted at the center of the left end face of the vessel body 5. A bearing and a shaft seal are also installed between the first stirring shaft and the vessel body 5 to seal against asphalt material from entering the bearing. The first stirring motor 61 is fixedly mounted to the vessel body 5, and its output end is connected and fixed to the first stirring shaft. The first stirring body 62 is mounted on the end of the first stirring shaft away from the first stirring motor. The first stirring body 62 rotates within the vessel body 5. The first stirring motor 61 is driven by the controller.

[0039] The second stirring device 7 includes a second stirring motor 71, a second stirring shaft (not shown), and a second stirring body 72. The second stirring shaft is installed at the center of the right end face of the vessel body 5 and is coaxial with the first stirring shaft. The second stirring shaft and the vessel body 5 are also connected by a bearing and a shaft seal. The shaft seal is sealed inside the bearing to prevent asphalt material from entering the bearing. The second stirring motor 71 is installed at the center of the right end of the vessel body 5. The output end of the second stirring motor 71 is connected and fixed to the second stirring shaft. The second stirring body 72 is installed at the end of the second stirring shaft away from the second stirring motor 71.

[0040] The first stirring body 62 includes a first connecting plate 620, a first scraper 621 annularly disposed on the outer wall of the first connecting plate 620, and a circumferential scraper 622 vertically disposed at the end of the first scraper 621. The first scraper 621 acts on the inner left end face of the vessel body 5, and the circumferential scraper 622 acts on the inner circumferential surface of the vessel body 5. The first connecting plate 620 is fixed to the first stirring shaft by bolt fixing, and positioning is achieved by a central polygonal hole. Multiple first stirring rods 623 are disposed on the end of the first scraper 621 facing the center of the vessel body 5. The second stirring body 72 includes a second connecting disk 720 and a second scraper 721 annularly arranged on the outer wall of the second connecting disk 720. The second scraper 721 acts on the inner right end face of the vessel body 5. Multiple second stirring rods 722 are arranged on the end of the second scraper 721 facing the first scraper 621. The first stirring rod 623 and the second stirring rod 722 are misaligned. Both the first stirring rod 623 and the second stirring rod 722 are parallel to the axis of the vessel body 5. The end of the second scraper 721 away from the second connecting disk 720 is separated from the circumferential scraper 622.

[0041] In the above technical solution, the cooperation of the first scraper 621, the circumferential scraper 622 and the second scraper 721 can achieve nearly 100% coverage of the inner wall of the vessel body 5, avoiding material sticking problems and residue problems during later unloading.

[0042] By staggering the first stirring rod 623 and the second stirring rod 722, and with the shear force generated by their reverse rotation, the asphalt material can be mixed more quickly.

[0043] See Figure 3 As shown, the first stirring rod 623 is prismatic and has two cutting edges 6230. When the first stirring rod rotates, it cuts the asphalt material through the cutting edges.

[0044] The use of a 6230 blade has two main benefits: first, it reduces rotational resistance; second, it produces a cutting effect, which helps in the mixing of asphalt materials.

[0045] See Figure 3 As shown, the outer end face of the circumferential scraper 722 is an arc-shaped surface, which fits against the inner wall of the vessel body.

[0046] The curved surface design can increase the contact area between the circumferential scraper 722 and the inner wall of the vessel body 5.

[0047] See Figure 2 As shown, the second stirring rod is a circular rod.

[0048] The second stirring rod is a round rod and is solid in design.

[0049] The stirring method is as follows:

[0050] Step 1: Loading and Sealing

[0051] 1. Open the sealing cap 58 on the feeding pipe 57 and add the asphalt raw material into the reactor body 5.

[0052] 2. Tightly close the sealing cap 58 to ensure its airtightness.

[0053] Step 2: Vacuuming and initial mixing (degassing stage)

[0054] 1. Temperature control: The target temperature of the electric heater 1 is set by the controller to raise the temperature of the asphalt inside the reactor body 5 to 160°-180°C. At this temperature, the viscosity of the asphalt is moderate, which is conducive to the escape of air bubbles.

[0055] 2. Mixing Control: Start the first mixing device 6 and the second mixing device 7. Low-speed mixing is used in this stage; the speed of both the first mixing motor 61 and the second mixing motor 71 is set to 30-50 rpm. The purpose of low-speed mixing is to gently agitate the asphalt, creating stable conditions for air bubbles to rise, while avoiding the entrainment of excessive air.

[0056] 3. Vacuum Operation: Open the second solenoid valve 56 connected to the vacuum pump to evacuate the inside of the vessel 5, maintaining the absolute pressure at -0.08MPa to -0.1MPa. Under this vacuum level, volatile components and microbubbles in the asphalt are easily released.

[0057] 4. Duration: This vacuuming and low-speed mixing process lasts for 30-60 minutes, or until the internal pressure displayed by pressure sensor 4 is stable and without drastic fluctuations, indicating that degassing is basically complete.

[0058] Step 3: Enhanced mixing and homogenization (fine mixing stage)

[0059] 1. Pressure Restoration: Close the second solenoid valve 56 for vacuuming, and inject inert gas (such as nitrogen) into the vessel 5 through another second solenoid valve 56 to restore the internal pressure to atmospheric pressure or slightly higher than atmospheric pressure (0.1-0.3 MPa). Pressurization can further inhibit the oxidation and decomposition of asphalt at high temperatures.

[0060] 2. Stirring Control: Increase the rotation speed of the first stirring device 6 and the second stirring device 7 to a high-speed mixing mode. Set the rotation speed of the first stirring motor 61 and the second stirring motor 71 to 80-120 rpm, and ensure that they rotate in opposite directions. This utilizes the staggered arrangement of the first stirring rod 623 and the second stirring rod 722 to generate strong shearing force, thoroughly breaking up gel clumps and achieving uniform mixing.

[0061] 3. Temperature control: Depending on the specific grade of asphalt, the mixing temperature is precisely controlled within the range of 180°C-220°C to ensure that the asphalt has optimal fluidity and reactivity.

[0062] 4. Duration: This high-speed, intensified mixing process lasts 60-120 minutes.

[0063] Step 4: Insulation and Preparation for Spinning

[0064] 1. Reduce the stirring speed to a holding speed of 40-60 rpm to maintain the mixing temperature.

[0065] 2. Maintain a slight positive pressure inside the reactor to prepare for the spinning operation.

[0066] Step 5: Discharging and Cleaning

[0067] 1. Open the first solenoid valve 3 on the outlet pipe 53 to transport the uniformly mixed asphalt material to the next process.

[0068] 2. Key Precautions: During the discharge and subsequent equipment cleaning process, the electric heater 1 must be kept running continuously to prevent the asphalt from cooling and solidifying in the reactor body 5 and the outlet pipe 53 until the cleaning work is completely completed.

[0069] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0070] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0071] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0072] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0073] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0074] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pitch-based carbon fiber spinning preparation apparatus, comprising a controller, an electric heater, a temperature sensor, a first solenoid valve, and a pressure sensor, wherein the electric heater, temperature sensor, first solenoid valve, and pressure sensor are all electrically connected to the controller, characterized in that, Also includes: The vessel body is cylindrical, with flat left and right end faces and a circular outer surface. An installation pipe is located at the top of the outer surface, and a maintenance cover is detachably installed at the pipe opening. A pressure sensor is mounted on the maintenance cover, with its sensing end located inside the cover to detect the internal pressure of the vessel body. An outlet pipe is located at the bottom of the outer surface, with a first solenoid valve installed at its lower end. A temperature sensor and a heater are installed on the side of the outlet pipe. A connecting pipe is located on the side of the maintenance cover, through which a tee pipe is installed. Second solenoid valves are installed at the remaining two passages of the tee pipe, one for connecting to a vacuum device and the other for connecting to a pressurizing device. A feeding pipe is located at the top of the side of the vessel body, and a sealing cover is detachably installed at the feeding pipe. A first stirring device and a second stirring device are respectively installed on the left and right end faces of the vessel body, and the first stirring device, the second stirring device and the vessel body are coaxially arranged, with the first stirring device and the second stirring device arranged alternately.

2. The pitch-based carbon fiber spinning preparation apparatus according to claim 1, characterized in that: The first stirring device includes a first stirring motor, a first stirring shaft, and a first stirring body. The first stirring shaft is rotatably mounted at the center of the left end face of the vessel body. The first stirring motor is fixedly mounted to the vessel body, and the output end of the first stirring motor is connected and fixed to the first stirring shaft. The first stirring body is mounted on the end of the first stirring shaft away from the first stirring motor. The first stirring body rotates inside the vessel body. The first stirring motor is driven by the controller.

3. The apparatus for preparing pitch-based carbon fiber spinning according to claim 2, characterized in that: The second stirring device includes a second stirring motor, a second stirring shaft, and a second stirring body. The second stirring shaft is installed at the center of the right end face of the vessel and is coaxial with the first stirring shaft. The second stirring motor is installed at the center of the right end of the vessel. The output end of the second stirring motor is connected and fixed to the second stirring shaft. The second stirring body is installed at the end of the second stirring shaft away from the second stirring motor.

4. The pitch-based carbon fiber spinning preparation apparatus according to claim 3, characterized in that: The first stirring body includes a first connecting plate, a first scraper annularly disposed on the outer wall of the first connecting plate, and a circumferential scraper perpendicularly disposed at the end of the first scraper. The first scraper acts on the inner left end face of the vessel body, and the circumferential scraper acts on the inner circumferential surface of the vessel body. The first connecting plate is fixed to the first stirring shaft. Multiple first stirring rods are disposed at the end of the first scraper facing the center of the vessel body. The second stirring body includes a second connecting plate, and a second scraper annularly disposed on the outer wall of the second connecting plate. The second scraper acts on the inner right end face of the vessel body. Multiple second stirring rods are disposed at the end of the second scraper facing the first scraper. The first stirring rod and the second stirring rod are misaligned. Both the first stirring rod and the second stirring rod are parallel to the axis of the vessel body. The end of the second scraper away from the second connecting plate is separated from the circumferential scraper.

5. The apparatus for preparing pitch-based carbon fiber spinning according to claim 4, characterized in that: The first stirring rod is prismatic and has two cutting edges. When the first stirring rod rotates, it cuts the asphalt material through the cutting edges.

6. The apparatus for preparing pitch-based carbon fiber spinning according to claim 4, characterized in that: The outer end face of the circumferential scraper is an arc-shaped surface, which fits against the inner wall of the vessel body.

7. The apparatus for preparing pitch-based carbon fiber spinning according to claim 4, characterized in that: The second stirring rod is a circular rod.

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