Simulated sizing experiment system

Abstract

The utility model provides a sizing simulation experiment system. A passive silk releasing creel, a silk guide roller set, a sizing tank, a sizing agent extrusion silk guide roller set, a traction rope, a silk collecting roller and a speed regulation winding machine are sequentially arranged from front to back. The passive silk releasing creel is not driven by a motor, and the silk releasing tension of a silk releasing spool is adjusted by a spring tension controller; the godet group and the sizing agent extrusion godet group are respectively formed by horizontally placing a plurality of smooth guide rollers and arranging the smooth guide rollers into a vertical column, so that tension adjustment in a sizing experiment process is realized; after sizing, the fibers do not need to be wound, and the fibers with certain length are manually sheared and put into a drying box for drying and subsequent testing. The simulation sizing experiment system provided by the utility model is simple in process, convenient to operate, accurate in data, material-saving, and higher in simulation research efficiency when being applied to a sizing process.

Description

Technical Field

[0001] This utility model relates to the field of carbon fiber sizing agent research and development, specifically a simulated sizing experimental research system for mesophase pitch-based carbon fiber. Background Technology

[0002] Mesophase pitch-based carbon fiber is a high-modulus, high-strength, and high-thermal-conductivity carbon fiber material produced through a series of processes including pitch synthesis, melt spinning, oxidation, carbonization, graphitization, and sizing. It has important applications in aerospace and high-end industries. Sizing is a crucial step in the production of mesophase pitch-based carbon fiber. The sizing agent not only protects the fibers and promotes fiber bundling but also acts as a link between the fibers and the composite matrix, influencing various properties of the composite material. Therefore, research on the sizing process is extremely important. In the industrial production of carbon fiber, the entire process is highly continuous. However, the setting of sizing agents and sizing process parameters is often difficult to determine on its own. Instead, it is usually determined after the entire carbon fiber production process is completed, based on the performance of the final product and even the composite material. This lag hinders timely problem identification and resolution, leading to significant material consumption and reduced production efficiency.

[0003] In one existing technology, fibers are wound into spindles after processes such as yarn rack, ultrasonic fiber opening and expansion, sizing, blowing, infrared heating, and winding. This patent can simulate the sizing process and test and evaluate the sized fibers. However, this method is cumbersome, the equipment is complex, the process is long, and the material consumption is large. It is close to an industrialized sizing device, which is somewhat different from the requirements of the experimental simulation system to be efficient, fast, and easy to operate.

[0004] The simulated sizing experimental system developed in this invention features a simplified process, convenient operation, rapid testing, high experimental efficiency, accurate data, and material savings, making it more efficient for sizing process simulation research. Utility Model Content

[0005] This invention provides a simulated sizing experimental system, specifically applied in the research and development of mesophase pitch-based carbon fiber processes. The objective of this invention is achieved through the following methods.

[0006] A simulated sizing test system is characterized by the following components arranged sequentially from front to back: a passive yarn feeding frame, a guide roller group, a sizing tank, a sizing agent extrusion guide roller group, a traction rope, a take-up roller, and a speed-regulating winding machine. The guide roller group consists of several smooth guide rollers placed horizontally and arranged in a vertical column. The friction force experienced by the fiber as it passes through guide rollers at different heights varies, thereby achieving tension adjustment during the sizing test. The sizing agent extrusion guide roller group, also composed of several smooth guide rollers placed horizontally and arranged in a vertical column, allows the fiber to pass through one or more extrusion guide rollers. Different passing methods result in different fiber running angles and tensions, thereby adjusting and controlling the extrusion tension experienced by the fiber after sizing. After sizing, the fiber does not need to be wound up; a certain length of fiber is manually cut and placed in a drying oven for drying and subsequent testing.

[0007] Furthermore, the passive yarn feeding frame is not driven by a motor; instead, a spring tension controller adjusts the yarn feeding tension of the yarn feeding bobbin, keeping the fibers taut during the feeding process. The entire feeding process is passive. Disc tension regulators and rotor tension regulators, for example, can cause some wear and tear on the fibers, producing a large amount of fuzz. However, the spring tension controller does not act directly on the fibers, causing no damage and providing suitable tension, making it more suitable for tension control in this simulated sizing experiment system.

[0008] Furthermore, the diameters of the guide roller assembly and the sizing agent extrusion guide roller assembly are 5-10 cm. In the experimental simulation system, the guide roller diameter should not be too large; it should only be large enough to achieve tension control and sizing extrusion effect. Conversely, the diameter should not be too small, as a small diameter makes operation difficult.

[0009] Furthermore, all guide rollers are rotatable passive guide rollers with bearings, which avoids the cumbersome setup of multiple motors, simplifies the structure of the experimental system, and makes operation convenient and fast.

[0010] Furthermore, the traction system consists of a traction rope, a take-up roller, and a speed-regulating winding machine. The traction rope connects to the sized carbon fiber bundle. After the sized fiber bundle is drawn out, it does not need to be wound up. A certain length of fiber is manually cut, dried, and then tested. Sizing and drying are operated independently, which further simplifies the simulated sizing experimental system, avoids the cumbersomeness of continuous operation, and ensures that the fiber is fully dried.

[0011] Furthermore, the amount of sizing can be controlled by adjusting the speed of the winding machine to control the residence time of the fiber in the sizing tank.

[0012] The beneficial effects of this utility model are:

[0013] The tension during the sizing process is adjusted by a set of vertically arranged guide rollers. The method is simple and the adjustment effect is obvious. Different combinations of guide rollers can be used to achieve various tension adjustments.

[0014] A spring tension controller is used to adjust the unwinding tension, ensuring appropriate tension without damaging the fibers.

[0015] Compared to industrial equipment, this simulation system has a more streamlined design, uses fewer motors, and does not require consideration of process continuity issues that must be considered in industrial equipment. It can quickly and efficiently conduct research on sizing processes through experimental simulation.

[0016] By using a controllable speed traction system to pull the fiber bundle, the sizing time can be adjusted. Compared with the method commonly used in the laboratory, which involves manually immersing a section of fiber in sizing agent, this method has repeatable and controllable experimental conditions and accurate experimental data.

[0017] After the traction machine takes in the fibers, a certain length of fiber is manually cut for drying and subsequent testing. This avoids the tediousness of continuous sizing and drying operations, and ensures that the fibers are completely dry, resulting in good experimental results. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings. Figure 1 The schematic diagram of the simulated sizing experimental system provided by this utility model includes: 1. Passive yarn feeding frame; 11. Spring tension controller; 12. Yarn bobbin; 2. Unsized carbon fiber filament bundle; 3. Guide roller assembly; 4. Sizing agent; 5. Sizing tank; 6. Sizing agent squeezing guide roller assembly; 7. Sized carbon fiber filament bundle; 8. Traction rope; 9. Take-up roller; 10. Speed-regulating winding machine. Figure 2 This is a schematic diagram of another embodiment of the simulated sizing experimental system provided by this utility model, wherein: 1. Passive yarn feeding frame; 11. Spring tension controller; 12. Yarn bobbin; 2. Unsized carbon fiber filament bundle; 3. Guide roller assembly; 4. Sizing agent; 5. Sizing tank; 6. Sizing agent squeezing guide roller assembly; 7. Sized carbon fiber filament bundle; 8. Traction rope; 9. Take-up roller; 10. Speed-regulating winding machine. Detailed Implementation

[0019] Implementation Method 1

[0020] Combination Figure 1 Here is one embodiment of the present invention.

[0021] A simulated sizing test system is characterized in that, from front to back, a passive yarn feeding frame (1), a guide roller group (3), a sizing trough (5), a sizing agent squeezing guide roller group (6), a traction rope (8), a take-up roller (9), and a speed-regulating winding machine (10) are arranged in sequence; the guide roller group (3) consists of two smooth guide rollers placed horizontally and arranged in a vertical column; the sizing agent squeezing guide roller group (6) consists of four smooth guide rollers placed horizontally and arranged in a vertical column.

[0022] A roll of unsized mesophase pitch-based graphite fiber with a modulus of 800 GPa was placed on a yarn bobbin (12). Under the tension control of the spring tension controller (11), the fiber bundle (2) was passed through the experimental system. The fiber was manually guided from above the second guide roller of the guide roller group (3), and then guided downward through the first guide roller to change direction and enter the sizing tank (5). Tension control was achieved here. The sizing tank contained sizing agent (4). The fiber passed under the guide roller in the sizing tank (5) while maintaining tension and sizing. After sizing, the carbon fiber bundle (7) passed under the first extrusion guide roller of the sizing agent extrusion guide roller group (6), and was guided to the second extrusion guide roller to change direction and connect with the traction rope (8). The amount of sizing was controlled by the extrusion guide roller. The winding machine (9) was set to a speed of 90 cm / min. Under the drive of the traction rope (8), the length of the uniformly sized carbon fiber bundle reached 2 m. The traction was stopped, and 2 m of carbon fiber was cut for drying and subsequent testing.

[0023] Implementation Method 2

[0024] Combination Figure 2 Here is one embodiment of the present invention.

[0025] A simulated sizing test system is characterized in that, from front to back, a passive yarn feeding frame (1), a guide roller group (3), a sizing trough (5), a sizing agent squeezing guide roller group (6), a traction rope (8), a take-up roller (9), and a speed-regulating winding machine (10) are arranged in sequence; the guide roller group (3) consists of two smooth guide rollers placed horizontally and arranged in a vertical column; the sizing agent squeezing guide roller group (6) consists of four smooth guide rollers placed horizontally and arranged in a vertical column.

[0026] A roll of unsized mesophase pitch-based graphite fiber with a modulus of 800 GPa was placed on a yarn bobbin (12). Under the tension control of a spring tension controller (11), the fiber bundle (2) was passed through the experimental system. The fiber was manually guided from above the second guide roller of the guide roller group (3), and then guided downward through the first guide roller to change direction and enter the sizing tank. Tension control was achieved here. The sizing tank contained sizing agent (4). The fiber passed under the guide roller in the sizing tank (5) while maintaining tension and sizing. After sizing, the carbon fiber bundle (7) passed under the first extrusion roller of the sizing agent extrusion guide roller group (6), passed through the second and third guide rollers, and then changed direction after passing through the fourth guide roller and connected to the traction rope (8). The amount of sizing was controlled by the extrusion guide roller multiple times here. The speed of the winding machine (9) is set to 50cm / min. Under the drive of the traction rope (8), the length of the uniformly sized carbon fiber bundle reaches 2m. Then, the traction is stopped, and 2m length of carbon fiber is cut for drying and subsequent testing.

[0027] The above are merely preferred embodiments of this utility model. The implementation of this utility model is not limited to the two methods described above. Equivalent substitutions and improvements made by those skilled in the art without departing from the concept of this utility model should also be within the protection scope of this utility model.

Claims

1. A simulated sizing experiment system, characterized in that, The passive yarn feeding frame (1), guide roller group (3), sizing tank (5), sizing agent squeezing guide roller group (6), traction rope (8), take-up roller (9) and speed-regulating winding machine (10) are arranged from front to back. The guide roller group (3) is composed of several smooth guide rollers placed horizontally and arranged in a vertical column. The friction force on the fiber is different when passing through guide rollers of different heights, thereby realizing the tension adjustment during the sizing experiment. The sizing agent extrusion guide roller group (6) consists of several smooth guide rollers placed horizontally and arranged in a vertical column. The fiber can be selected to pass through one or several extrusion guide rollers.

2. The simulated sizing experimental system according to claim 1, characterized in that, The passive yarn feeding frame (1) is not driven by a motor, and the yarn feeding tension of the yarn feeding cylinder (12) is adjusted by a spring tension controller (11).

3. The simulated sizing experimental system according to claim 1, characterized in that, The diameter of the guide roller assembly (3) is 5-10cm.

4. The simulated sizing experimental system according to claim 1, characterized in that, The diameter of the sizing agent extrusion guide roller group (6) is 5-10cm.

5. The simulated sizing experimental system according to claim 1, characterized in that, All guide rollers are rotatable passive guide rollers with bearings.

6. The simulated sizing experimental system according to claim 1, characterized in that, The traction system consists of a traction rope (8), a take-up roller (9), and a speed-regulating winding machine (10). The traction rope is connected to the sized carbon fiber bundle.

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