A circular fiber woven cloth for composite material and a method for manufacturing the same

Abstract

The application provides a kind of annular fiber woven cloth for composite material and a preparation method thereof, and relates to a kind of annular fiber woven cloth for composite material and a preparation method thereof.By designing forming tooling, equipment scheme and fiber bundle interfixation scheme, high-quality, low-cost annular woven cloth material for annular stress composite product design and manufacturing is successfully prepared.This material skillfully disperses and bonds small particles in raw materials in the forming matrix during the rear-end manufacturing process into a whole.The application provides annular fiber layer along the stress direction for annular components such as cylinder end and carbon-carbon brake disc, provides reliable technical and process approach for further weight reduction, performance improvement and cost reduction, lays a material foundation for developing new high-quality annular stress products, promoting product upgrading and upgrading, and improving the application technology level of domestic composite materials, and has practicality and good economic and technical benefits.

Description

Technical Field

[0001] This invention relates to the field of circular fiber woven fabrics, and more specifically, to a circular fiber woven fabric for composite materials and its preparation method. Background Technology

[0002] Composite materials possess numerous advantages, including lightweight, high strength, high modulus, corrosion resistance, high fatigue strength, strong designability, and flexible molding processes. They have found widespread application in aerospace, new energy vehicles, high-speed trains, wind power, high-pressure gas cylinders, and the sports and health industries. With continuous breakthroughs in the production technology and mass production of key raw materials such as domestically produced T700 and T800 grade carbon fiber, carbon fiber prices have been declining, making carbon fiber composite products increasingly competitive in engineering mass production after overcoming price issues. Supported by low-carbon and environmental protection policies, the application of domestically produced carbon fiber in the new energy field has experienced explosive growth. For example, new energy hydrogen cylinders and carbon-carbon ceramic brake discs are highly sought after in the industry. Currently, hydrogen storage cylinders using carbon fiber winding are designed for increasingly higher pressures and larger volumes, making green and pollution-free power solutions for hydrogen-powered vehicles and large transport vehicles a technically and economically feasible option. On the other hand, carbon fiber reinforced carbon-based composite brake discs, with their advantages of lightweight, wear resistance, high temperature resistance, rust resistance, and long service life, are highly sought after in the high-end braking fields of high-speed trains, hydrogen-powered vehicles, and large special-purpose trucks.

[0003] However, industry research has revealed that the shape limitations of the end caps at both ends of wound gas cylinders mean that radial winding is currently the only option, preventing circumferential reinforcement. This bottleneck hinders the improvement of high-pressure gas cylinder performance and makes the cylinders susceptible to damage and gas leakage during service. Furthermore, brake discs are a common product subjected to circumferential loads. Materials must withstand significant circumferential loads during service. Improving the circumferential fiber distribution during product design is beneficial for weight reduction and performance enhancement. However, there are currently no circular woven fabrics available on the market, forcing engineers to use longitudinally and laterally interwoven carbon fiber fabrics. When this type of interwoven fabric is used on hollow annular composite brake discs subjected to circumferential forces, the material's performance cannot be fully utilized, and the middle portion must be removed, resulting in a significant waste of carbon fiber resources. Similar products currently available on the market include resin-impregnated dry-winding prepreg tapes; there are no circular fiber fabrics for liquid resin winding of gas cylinders or carburizing processes of brake discs. Therefore, we propose a circular fiber woven fabric for composite materials and its preparation method. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the current background art. To achieve the above-mentioned objective, this invention provides the following technical solution: a ring-shaped fiber woven fabric for composite materials, comprising ring-shaped woven fabric fibers, wherein the ring-shaped woven fabric fibers include, but are not limited to, one or more combinations of carbon fiber, glass fiber, aramid fiber, PBO fiber, and ultra-high molecular weight polyethylene fiber, and the connection method between the ring fibers includes one or more combinations of particle and droplet adhesion, fiber fixing, and sewing methods.

[0005] As a preferred technical solution of the present invention, the production equipment for ring-shaped fiber woven fabric includes tension unwinding, yarn spreading, material spraying, heating, winding and rewinding, and a programming control system.

[0006] As a preferred technical solution of the present invention, the surface of the annular fiber winding clamp of the annular fiber woven fabric is distributed with spiral steps.

[0007] As a preferred technical solution of the present invention, the carbon fiber and the yarn spreading device are installed on a moving trolley driven by a stepper motor and a lead screw nut, and the moving speed of the trolley is controlled by programming; the winding clamp is installed on the winding drive shaft perpendicular to the yarn spreading system, and is fixed by quick-release bearing supports at both ends. The winding and winding clamp consists of a contour mandrel and a baffle. The contour mandrel of the flat ring-shaped fabric is a hollow ring, which is installed on the winding drive shaft; the mandrel is radially divided and assembled into a whole by screws.

[0008] As a preferred technical solution of the present invention, a spiral step with a small draft angle along the axial direction is machined in the inclined part, and the outer circle of the step is the position of the inner circle size of the fabric layer; the baffle is a metal or plastic plate set according to the winding size and shape, and the baffle is a metal or plastic plate that limits the vertically distributed end winding fibers.

[0009] As a preferred technical solution of the present invention, multiple winding mandrels and unwinding and unwinding devices are installed side by side along the axial direction on the flat winding woven fabric structure mandrel. The flat fabric baffle and mandrel can be made of plastic and can be removed as a protective carrier for the product after winding. For concave or convex woven fabric, a soft film is formed on the surface of the mold by spraying, electrophoresis, or blow molding.

[0010] As a preferred technical solution of the present invention, the components of the fixing and bonding material in the composite material molding matrix are selected from one or more combinations of resin system powder, asphalt, sizing agent, and organic solvent.

[0011] A method for preparing a ring-shaped fiber woven fabric for composite materials, including the preparation process of the convex ring-shaped fiber woven fabric;

[0012] Step S1: A composite material ring fiber braiding equipment structure, the moving components installed on the moving trolley include: a fiber tension unwinding mechanism for mounting carbon fiber rolls, a magnetic powder brake tension unwinding mechanism, and a fiber tension measuring roller and control circuit forming a tension closed-loop control system; a hot air blowing, tension vibration spreading roller and spreading roller forming a spreading system; an adhesive spraying system, an adhesive hot air melting system, and yarn width and position adjustment rods are installed on the moving trolley; the moving trolley is installed on a fixed chassis via a guide rail slider structure, and the moving trolley moves along the guide rail by a drive system composed of a stepper motor and a precision lead screw nut; a contouring clamp and a baffle are installed on a drive system composed of a quick-release bearing, a drive motor, and a reducer via a rotating shaft;

[0013] Step S2: During the winding process, the carbon fiber passes sequentially through the fiber width, position positioning rod, spreading roller, tension measuring roller, and width position positioning rod, until it reaches the contouring fixture and baffle and is fixed to the rotating shaft with double-sided tape. The fiber tension is set to 0-10N, and the ratio of the travel speed of the winding shaft and the lead screw nut is set according to the pitch width on the contouring fixture so that the lead screw drives the carriage to advance uniformly by one pitch for each revolution of the main shaft. When the pitch is zero, the carriage does not move; when the pitch increases, the carriage moves faster. The hot air blowing and bonding material supply system is started, and the winding system winds the fiber with molten bonding agent into a disc. When the diameter of the fiber disc reaches the threaded area of ​​the contouring fixture, the program starts the lead screw drive system, and the fiber yarn is wound along the threaded steps on the contouring fixture until the winding is completed.

[0014] Step S3: Remove the product along with the contouring fixture, baffle and pivot. Carefully remove the contouring fixture and remove the fiber loop fabric strip that has been bonded together by the adhesive. After passing the quality inspection, pack it in a plastic bag with contoured EPS foam padding and put it into storage.

[0015] As a preferred technical solution of the present invention, the production process of flat circular woven fabric

[0016] Step S1: The structure and working principle of a composite material ring fiber braiding equipment, the components installed on the fixed equipment frame are: a carbon fiber roll on the fiber tension unwinding mechanism, the tension unwinding mechanism and the fiber tension measuring roller forming a tension closed-loop control system; a yarn spreading system composed of hot air blowing and tension vibration spreading rollers; an adhesive spraying system, an adhesive hot air melting bonding system, and yarn width and position adjustment rods installed on a fixed bracket; a layer of glass fiber fabric mesh is thermally attached to both sides of the flat clamp, and the flat clamp is installed on a rotating shaft supported by a quick-release shaft seat, the rotating shaft is driven by a motor through a reducer; multiple sets can be set along different radial radii and different angles based on the position of the material groove on the flat clamp, so as to realize multiple sets of simultaneous winding to speed up production efficiency;

[0017] Step S2: The carbon fiber drawn from the closed-loop tension-controlled carbon fiber spool passes sequentially through the fiber width positioning rod, the spreading roller, the tension measuring roller, and the width positioning rod to the flat clamp; double-sided tape is used to fix the fiber between the two baffles of the winding shaft; the fiber tension is set to 0-10N, the hot air blowing and bonding material supply system is started, and the winding system winds the fiber with molten bonding agent into a disc until the winding is completed;

[0018] Step S3: Remove the product along with the clamp and shaft, carefully remove the clamp, put it in the oven to heat, and after the small amount of resin particles in the reinforcing fabric and between the fiber bundles melt, connect the ring-shaped fabric strip into a whole, cool and remove it, and after passing the quality inspection, pack it into bags and put it into storage.

[0019] As a preferred technical solution of the present invention, the yarn or mesh is woven from cotton yarn, nylon yarn, carbon fiber, glass fiber, or aramid fiber.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. By designing a scheme to produce circumferential fiber woven fabric for planar or concave-convex circular composite material layup products, a new structural design and production process solution is provided for circumferential stress composite products, which improves material utilization and reduces product production costs.

[0022] 2. Improve the production efficiency of circular unidirectional braided belts and reduce production costs by designing specialized production equipment and fixtures.

[0023] 3. The use of annular unidirectional reinforcing fibers provides a new feasible technical solution for improving the structural strength and airtightness of gas cylinder end caps, and provides a new feasible technical approach for developing and producing Type IV and Type V storage gas cylinders with larger volume and higher pressure.

[0024] 4. The application of planar annular unidirectional braided tape in the field of brake discs can not only improve material utilization by stress-based plying, but also reduce the volume of carbon fiber material cut out in the middle of the brake disc annulus, thus saving materials and reducing production costs. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the semi-circular concave-convex structure circumferential fiber winding device according to Embodiment 1 of the present invention;

[0026] Figure 2 A simplified schematic diagram of the flat plate winding device provided in Embodiment 2 of the present invention;

[0027] Figure 3 A simplified schematic diagram of the flat plate winding device provided in Embodiment 2 of the present invention;

[0028] Figure 4This is a partial structural schematic diagram of the semi-circular concave-convex structure circumferential fiber winding device of Embodiment 1 of the present invention.

[0029] The image shows:

[0030] 1. Fiber tension unwinding mechanism; 2. Carbon fiber spool; 3. Carbon fiber; 4. Hot air blowing; 5. Tension vibration unwinding roller; 6. Tension measuring roller; 7. Adhesive spraying system; 8. Adhesive hot air melting system; 9. Yarn width and position adjustment rod; 10. Rotary shaft; 11. Quick-release shaft seat; 12. Drive motor; 13. Reducer; 14. Contouring clamp; 15. Baffle; 16. Fixed chassis; 17. Moving trolley; 18. Roller shaft; 19. Precision lead screw nut. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely illustrates some embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the embodiments and features and technical solutions in the embodiments of the present invention can be combined with each other. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] Example 1: Please refer to Figures 1-4 A composite material ring fiber woven fabric includes ring woven fabric fibers, wherein the ring woven fabric fibers include, but are not limited to, one or more combinations of carbon fiber 3, glass fiber, aramid fiber, PBO fiber, and ultra-high molecular weight polyethylene fiber, and the connection method between the ring fibers includes one or more combinations of particle and droplet adhesion, fiber fixing, and sewing.

[0034] The production equipment for loop fiber woven fabric consists of tension unwinding, yarn spreading, material spraying, heating, winding and rewinding, and a programming control system.

[0035] The surface of the ring-shaped fiber winding clamp for the ring-shaped fiber woven fabric has spiral steps.

[0036] 3. The yarn spreading device is installed on a moving trolley 17 driven by a stepper motor and a lead screw nut. The moving speed of the trolley is controlled by programming. The winding clamp is installed on the winding drive shaft perpendicular to the yarn spreading system. It is fixed by quick-release bearing supports at both ends. The winding and winding clamp consists of a contour mandrel and a baffle 15. The contour mandrel of the flat ring-shaped fabric is a hollow ring and is installed on the winding drive shaft. The mandrel is radially divided and assembled into a whole by screws.

[0037] A spiral step with a small draft angle along the axial direction is machined on the inclined part. The outer circle of the step is located at the inner circle size of the fabric layer. The baffle 15 is a metal or plastic plate set according to the winding size and shape, which limits the vertically distributed end winding fibers.

[0038] Multiple winding mandrels and unwinding / unwinding devices are installed side-by-side along the axial direction on the flat wound woven fabric structure mandrel. The flat fabric baffle 15 and the mandrel can be made of plastic and can be removed after winding as a protective carrier for the product. For concave or convex shaped woven fabric, a soft film is formed on the mold surface by spraying, electrophoresis, or blow molding.

[0039] The components of the fixing and bonding material in the composite molding matrix are selected from one or more combinations of resin system powder, asphalt, sizing agent, and organic solvent.

[0040] A method for preparing a ring-shaped fiber woven fabric for composite materials, including the preparation process of the convex ring-shaped fiber woven fabric;

[0041] Step S1: A composite material ring fiber braiding equipment structure, the moving components installed on the moving trolley 17 include: a fiber tension unwinding mechanism 1 for mounting carbon fiber roll 2, a magnetic powder brake tension unwinding mechanism 1 and a fiber tension measuring roller 6 forming a tension closed-loop control system with the control circuit; a hot air blowing 4 and a tension vibration yarn spreading roller 5 and a yarn spreading roller 6 forming a yarn spreading system; an adhesive spraying system 7, an adhesive hot air melting system 8, and a yarn width and position adjustment rod 9 are installed on the moving trolley 17; the moving trolley 17 is installed on the fixed chassis 16 through a guide rail slider structure, and the moving trolley 17 moves along the guide rail 17 by a drive system composed of a stepper motor 12 and a precision lead screw nut 19; a contour clamp 14 and a baffle 15 are installed on the drive system composed of a quick-release bearing 11, a drive motor 12, and a reducer 13 through a rotating shaft 10;

[0042] Step S2: During the winding process, carbon fiber 2 passes sequentially through the fiber width and position positioning rod 9, the spreading roller 5, the tension measuring roller 6, and the width position positioning rod 9, until it reaches the contouring fixture 14 and the baffle 15, and is fixed to the rotating shaft with double-sided tape; the fiber tension is set to 0-10N, and the ratio of the travel speed of the winding shaft and the screw nut is set according to the pitch width on the contouring fixture 14 so that the screw drives the carriage to advance evenly by one pitch for each revolution of the main shaft. When the pitch is zero, the carriage does not move. When the pitch increases, the carriage moves faster; the hot air blowing system 4 and 8 and the adhesive material supply system 7 are started. The winding system winds the fiber with molten adhesive into a disc. When the diameter of the fiber disc reaches the threaded area of ​​the contouring fixture, the program starts the screw drive system. The fiber yarn is wound along the threaded steps on the contouring fixture until the winding is completed.

[0043] Step S3: Remove the product along with the contouring clamp 14, baffle 15 and rotating shaft 10. Carefully remove the contouring clamp and remove the fiber loop fabric strip that has been bonded together by the adhesive. After passing the quality inspection, put it into a plastic bag with contoured EPS foam padding for packaging and warehousing.

[0044] Production process of flat circular woven fabric

[0045] Step S1: The structure and working principle of a composite material ring fiber braiding equipment, the components installed on the fixed equipment frame are: carbon fiber roll 2 on fiber tension unwinding mechanism 1, tension unwinding mechanism 1 and fiber tension measuring roller 7 form a tension closed loop control system; hot air blowing 4 and tension vibration spreading roller form a spreading system; adhesive spraying system 8, adhesive hot air melting bonding system 9, and yarn width and position adjustment rod 10 are installed on the fixed bracket; a layer of glass fiber fabric mesh is thermally attached to both sides of the flat clamp 15, and the flat clamp is installed on the rotating shaft 11 supported by quick-release shaft seat 12, the rotating shaft 11 is driven by motor 14 through reducer 13; multiple sets can be set along different radial radii and different angles with the material groove position on the flat clamp 15 as the position reference, so as to realize multiple sets of simultaneous winding to speed up production efficiency;

[0046] Step S2: The carbon fiber 3 drawn from the closed-loop tension-controlled carbon fiber spool 2 passes sequentially through the fiber width position positioning rod 10, the spreading roller 5, the tension measuring roller 7, the width position positioning rod 10, and the flat clamp 15; double-sided tape is used to fix the fiber between the two baffles of the winding shaft; the fiber tension is set to 0-10N, the hot air blowing 4 and 9 and the bonding material supply system 8 are started, and the winding system winds the fiber with molten bonding agent into a disc until the winding is completed;

[0047] Step S3: Remove the product along with the clamp 15 and the rotating shaft 11. Carefully remove the clamp and place it in an oven to heat. After the small amount of resin particles in the reinforcing fabric and between the fiber bundles melt, connect the ring-shaped fabric strip into a whole. Cool and remove it. After passing the quality inspection, pack it into bags and put it into storage.

[0048] The yarn or mesh is woven from cotton yarn, nylon yarn, carbon fiber, glass fiber, or aramid fiber.

[0049] Example 2: A process for preparing a convex annular fiber woven fabric for composite materials, the specific steps of which are as follows:

[0050] Step S1: A composite material ring fiber braiding equipment structure, with moving components mounted on a moving trolley 17 including: a fiber tension unwinding mechanism 1 for mounting carbon fiber rolls 2, a magnetic powder brake tension unwinding mechanism 1, and a fiber tension measuring roller 6 forming a tension closed-loop control system with a control circuit; a hot air blowing system 4 and tension vibration spreading rollers 5 and 6 forming a spreading system; an adhesive spraying system 7, an adhesive hot air melting system 8, and a yarn width and position adjustment rod 9 mounted on the moving trolley 17. The moving trolley 17 is mounted on a fixed chassis 16 via a guide rail slider structure, and moves along the guide rail 17 by a drive system consisting of a stepper motor 12 and a precision lead screw nut 19. A contour clamp 14 and a baffle 15 are mounted on a drive system consisting of a quick-release bearing 11, a drive motor 12, and a reducer 13 via a rotating shaft 10.

[0051] Step S2: During the winding process, carbon fiber 2 sequentially passes through the fiber width and position positioning rod 9, the spreading roller 5, the tension measuring roller 6, and the width position positioning rod 9, until it reaches the contouring fixture 14 and the baffle 15, where it is fixed to the rotating shaft using double-sided tape. The fiber tension is set to 0-10N. The ratio of the winding shaft and the lead screw nut's travel speed is set according to the pitch width on the contouring fixture 14, so that for every revolution of the main shaft, the lead screw drives the trolley to advance uniformly by one pitch. When the pitch is zero, the trolley remains stationary; as the pitch increases, the trolley's movement speed increases. Hot air blowing systems 4 and 8 and the adhesive material supply system 7 are activated. The winding system winds the fiber with molten adhesive into a disc. When the diameter of the fiber disc reaches the threaded area of ​​the contouring fixture, the program activates the lead screw drive system. The fiber yarn is wound along the threaded steps on the contouring fixture until winding is complete.

[0052] Step S3: Remove the product along with the contouring clamp 14, baffle 15, and pivot 10. Carefully remove the contouring clamp and remove the fibrous loop fabric strip that has been bonded together with adhesive. Figure 1 As shown, after passing quality inspection, the products are packaged in plastic bags with conformal EPS foam padding and then stored.

[0053] Example 3: A production process for a flat circular woven fabric of composite material ring fiber woven fabric, the specific steps are as follows: Step S1: The structure and working principle of a device for a composite material ring fiber woven fabric, the components installed on the fixed equipment frame are: carbon fiber roll 2 on the fiber tension unwinding mechanism 1, the tension unwinding mechanism 1 and the fiber tension measuring roller 7 form a tension closed-loop control system; hot air blowing 4 and tension vibration spreading rollers 5 and 6 form a spreading system; adhesive spraying system 8, adhesive hot air melting bonding system 9, and yarn width and position adjustment rod 10 are installed on the fixed bracket. A layer of glass fiber fabric mesh is thermally attached to both sides of the flat clamp 15, and the flat clamp is installed on the rotating shaft 11 supported by the quick-release shaft seat 12, the rotating shaft 11 is driven by the motor 14 through the reducer 13. The feeding, spreading and bonding functional modules composed of 1 to 10 can be set in multiple groups along different radial radii and different angles with the position of the material groove on the flat clamp 15 as the position reference, so as to realize the simultaneous winding of multiple groups and improve production efficiency.

[0054] Step S2: The carbon fiber 3, drawn from the closed-loop tension-controlled carbon fiber spool 2, passes sequentially through the fiber width positioning rod 10, the spreading roller 5, the tension measuring roller 7, and the width positioning rod 10 to the flat clamp 15. Double-sided tape is used to fix the fiber between the two baffles on the winding shaft. The fiber tension is set to 0-10N, and the hot air blowing systems 4 and 9 and the adhesive material supply system 8 are activated. The winding system winds the fiber with the molten adhesive into a coil until winding is complete.

[0055] Step S3: Remove the product along with clamp 15 and shaft 11. Carefully remove the clamp, place it in an oven to heat, and melt the small amount of resin particles between the fiber bundles in the reinforcing fabric. This will connect the looped fabric strips into a whole. After cooling, remove the product. Figure 2 As shown, after passing quality inspection, the products are bagged and stored in the warehouse.

[0056] In use, the carbon fiber and the yarn-spreading device are mounted on a moving trolley driven by a stepper motor and a lead screw nut. The trolley's movement speed is programmed and controlled. Under the action of a closed-loop tension control, unwinding, blowing, and vibration yarn-spreading device also mounted on the moving trolley, the fibers are spread into fiber bundles of uniform width and thickness. The winding clamp is mounted on a take-up drive shaft perpendicular to the yarn-spreading system, fixed at both ends by quick-release bearing supports. The drive shaft is driven by a high-precision stepper motor via a reducer, and the motor speed is programmed and controlled together with the moving trolley drive. The winding and take-up clamp consists of a contour mandrel and baffles. The contour mandrel for the flat, annular fabric is a hollow ring that can be mounted on the take-up drive shaft. The convex and concave contour mandrels are designed and machined according to the shape of the woven fabric, the thickness of the woven fabric layers, and the processing depth, with precise offset geometric dimensions. The mandrel is radially segmented and assembled into a whole by screws for easy removal later. A spiral stepped winding platform with a slight draft angle along the axial direction is machined on the inclined section. The outer circle of the platform corresponds to the inner circle dimension of the fabric layup. The baffle, designed according to the winding size and shape, is a metal or plastic plate that limits the vertically distributed end-wound fibers. For simple flat-wound woven fabrics, multiple winding mandrels and unwinding / spreading devices can be installed side-by-side along the axial direction on the structural mandrel, simplifying the trolley to a fixed configuration. Flat fabric baffles and mandrels can be made of plastic, serving as a protective carrier for the product after winding and facilitating removal. For customized concave or convex woven fabrics, a soft film can be formed on the mold surface using spraying, electrophoresis, or blow / vacuum forming methods, facilitating demolding and protecting the woven fabric product during transportation and use.

[0057] Before starting the winding process, install and adjust the tooling fixtures, and use double-sided tape to fix the fibers to the starting winding point of the roll. Fiber roll fixing methods include powder bonding and yarn-assisted fixing. For the bonding method, select the appropriate formulation material based on the final product matrix type. During the winding process, solid powders or liquid droplets are adhered to the fiber surface and between the filaments through methods such as impregnation, spraying, electrostatic adsorption, and scraping. Through heating and solvent evaporation, the particles or droplets impregnate and bond together between the wound fiber bundles, making them easy to handle without affecting the final product quality. The bonding material composition in the composite material matrix includes one or more combinations of resin powder, asphalt, sizing agents, and organic solvents. The yarn fixing method involves using yarns or meshes woven from cotton, nylon, carbon fiber, glass fiber, or aramid fiber. Before use, the mesh is moistened with a heated latent adhesive system or the yarn itself is heated to become tacky. It is then laid on both sides of the forming clamp and cooled to room temperature to complete the fixing. After winding, the clamp is removed, and the entire assembly is heated until the resin melts a second time, connecting the circumferential fibers in contact with it into a whole. After removal, quality inspection, and packaging, it is packaged as a ring-shaped fiber woven fabric product.

[0058] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the specific embodiments described above. Therefore, any modifications or substitutions to the present invention, and all technical solutions and improvements that do not depart from the spirit and scope of the invention, are covered within the scope of the claims of the present invention.

Claims

1. A ring-shaped fiber woven fabric for composite materials, characterized in that, The fiber used in the circular braided fabric includes one or more of the following: carbon fiber, glass fiber, aramid fiber, PBO fiber, and ultra-high molecular weight polyethylene fiber. The connection method between the circular fibers includes one or more of the following: particle adhesion, droplet adhesion, and fiber sewing fixation. The production equipment for circular fiber woven fabric consists of tension unwinding, yarn spreading, material spraying, heating, winding and rewinding, and a programming control system. The surface of the circular fiber winding clamp for the circular fiber woven fabric has spiral steps. The carbon fiber and yarn spreading device are mounted on a moving trolley driven by a stepper motor and a lead screw nut, and the trolley's movement speed is controlled by programming. The winding clamp is mounted on a winding drive shaft perpendicular to the yarn spreading system, and is fixed at both ends by quick-release bearing supports. The winding clamp consists of a contour mandrel and a baffle. The contour mandrel of the flat circular fabric is a hollow ring, mounted on the winding drive shaft. The mandrel is radially segmented and assembled into a whole by screws. A spiral step with a small draft angle along the axial direction is machined on the inclined part. The outer circle of the step is located at the inner circle size of the fabric layer. The baffle is set according to the winding size and shape. The baffle is a metal or plastic plate that limits the vertically distributed end winding fibers. Multiple winding mandrels and unwinding / unwinding devices are installed side-by-side along the axial direction on the flat wound woven fabric structure mandrel. The flat fabric baffle and mandrel are made of plastic and serve as a protective carrier for the product after winding. For concave or convex woven fabric conversion, a soft film is formed on the mold surface by spraying, electrophoresis, or blow molding. The components of the fixing and bonding material are selected from one or more combinations of resin system powder, liquid resin, asphalt, sizing agent, and organic solvent in the composite material molding matrix components.

2. A method for preparing a circular fiber woven fabric for composite materials according to claim 1, characterized in that, The preparation process of convex ring-shaped fiber woven fabric includes the following steps: Step S1: A composite material ring fiber braiding equipment structure, the moving components installed on the moving trolley include: a fiber tension unwinding mechanism for mounting carbon fiber rolls, a magnetic powder brake tension unwinding mechanism, and a fiber tension measuring roller and control circuit forming a tension closed-loop control system; a hot air blowing and tension vibration yarn spreading roller and yarn spreading roller forming a yarn spreading system; an adhesive spraying system, an adhesive hot air melting system, and yarn width and position adjustment rods are installed on the moving trolley; the moving trolley is installed on a fixed chassis via a guide rail slider structure, and the moving trolley moves along the guide rail by a drive system composed of a stepper motor and a precision lead screw nut; a contouring clamp and a baffle are installed on a drive system composed of a quick-release shaft seat, a drive motor, and a reducer via a rotating shaft; Step S2: During the winding process, the carbon fiber passes sequentially through the fiber width, position positioning rod, spreading roller, tension measuring roller, and width position positioning rod, until it reaches the contouring fixture and baffle and is fixed to the rotating shaft with double-sided tape. The fiber tension is set to 0-10N, and the ratio of the travel speed of the winding shaft and the lead screw nut is set according to the pitch width on the contouring fixture so that the lead screw drives the carriage to advance uniformly by one pitch for each revolution of the main shaft. When the pitch is zero, the carriage does not move; when the pitch increases, the carriage moves faster. The hot air blowing and bonding material supply system is started, and the winding system winds the fiber with molten bonding agent into a disc. When the diameter of the fiber disc reaches the threaded area of ​​the contouring fixture, the program starts the lead screw drive system, and the fiber yarn is wound along the threaded steps on the contouring fixture until the winding is completed. Step S3: Remove the product along with the contouring fixture, baffle and pivot. Carefully remove the contouring fixture and remove the fiber loop fabric strip that has been bonded together by the adhesive. After passing the quality inspection, pack it in a plastic bag with contoured EPS foam padding and put it into storage.

3. The method for preparing a ring-shaped fiber woven fabric for composite materials according to claim 2, characterized in that, Production process of flat circular woven fabric: Step S1: The structure and working principle of a composite material ring fiber braiding equipment, the components installed on the fixed equipment frame are: a carbon fiber roll on the fiber tension unwinding mechanism, the tension unwinding mechanism and the fiber tension measuring roller forming a tension closed-loop control system; a yarn spreading system composed of hot air blowing and tension vibration spreading roller; an adhesive spraying system, an adhesive hot air melting bonding system, and a yarn width and position adjustment rod installed on a fixed bracket; a layer of glass fiber fabric mesh is thermally attached to both sides of the flat clamp, and the flat clamp is installed on a rotating shaft supported by a quick-release shaft seat, the rotating shaft being driven by a motor through a reducer; the fiber tension unwinding mechanism, carbon fiber roll, carbon fiber, hot air blowing, tension vibration spreading roller, tension measuring roller, adhesive spraying system, adhesive hot air melting system, yarn width and position adjustment rod, and rotating shaft form a feeding, spreading, and bonding functional module, the material groove position on the flat clamp is set with multiple sets of different radial radii and angles as the position reference, so as to realize multiple sets of simultaneous winding to accelerate production efficiency; Step S2: The carbon fiber drawn from the closed-loop tension-controlled carbon fiber spool passes sequentially through the fiber width positioning rod, the spreading roller, the tension measuring roller, and the width positioning rod to the flat clamp; double-sided tape is used to fix the fiber between the two baffles of the winding shaft; the fiber tension is set to 0-10N, the hot air blowing and bonding material supply system is started, and the winding system winds the fiber with molten bonding agent into a disc until the winding is completed; Step S3: Remove the product along with the clamp and shaft, carefully remove the clamp, put it in the oven to heat, and after the small amount of resin particles in the reinforcing fabric and between the fiber bundles melt, connect the ring-shaped fabric strip into a whole, cool and remove it, and after passing the quality inspection, pack it into bags and put it into storage.

4. The method for preparing a ring-shaped fiber woven fabric for composite materials according to claim 3, characterized in that, The yarn or mesh is woven from cotton yarn, nylon yarn, carbon fiber, glass fiber, or aramid fiber.

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