Annular fiber woven cloth for composite material and preparation method of annular fiber woven cloth

Abstract

The invention provides annular fiber woven cloth for a composite material and a preparation method of the annular fiber woven cloth, and relates to annular unidirectional fiber woven cloth for the composite material and a preparation method of the annular unidirectional fiber woven cloth. By designing a forming tool, an equipment scheme and a fiber bundle fixing scheme, a high-quality and low-cost annular woven cloth material for designing and manufacturing an annular stress composite material product is successfully prepared. According to the material, raw materials in a forming base body in the rear-end manufacturing process are ingeniously used for dispersion and bonding of small particles to form a whole. An annular fiber layer laid in the stress direction is provided for the end of a gas cylinder, a carbon-carbon brake disc and other annular components, a reliable technology and process approach is provided for further weight reduction, performance improvement, cost reduction and efficiency improvement, and the method also provides a great significance for developing novel high-quality annular stress products. Product upgrading and updating are promoted, a material foundation is laid for improving the application technology level of domestic composite materials, and practicability and good economic and technical benefits are achieved.

Description

Technical Field

[0001] The invention relates to the field of annular fiber woven cloth, and in particular to annular fiber woven cloth for composite materials and a preparation method thereof. Background Art

[0002] Composite materials have many advantages such as light weight, high strength, high modulus, corrosion resistance, high fatigue strength, strong designability and flexible molding process. They have been widely used in aviation, aerospace, new energy vehicles, high-speed trains, wind power, high-pressure gas cylinders, and sports and health industries. With the continuous breakthroughs in the production technology of key raw materials, domestic T700 and T800 grade carbon fibers and the mass market supply, the price of carbon fibers has continued to decline, making carbon fiber composite materials products more and more competitive in engineering mass production after overcoming the price problem. With the support of low-carbon and environmental protection policies, the application of domestic carbon fibers in the field of new energy has ushered in explosive growth. For example, star products such as new energy hydrogen cylinders and carbon-carbon ceramic brake discs are highly sought after by the industry. At present, the design pressure of hydrogen storage cylinders wrapped with carbon fibers is getting higher and higher, and the volume is getting larger and larger, making the green and pollution-free power solution for hydrogen-powered vehicles and large transport vehicles one of the technically and economically feasible solutions. On the other hand, carbon fiber reinforced carbon-based composite brake discs are highly sought after in the high-end brake field of high-speed trains, hydrogen-powered vehicles, and large special trucks for their advantages such as light weight, wear resistance, high temperature resistance, no rust and long service life.

[0003] However, industry research has found that the ends of the wrapped gas cylinders are limited by their shape. Currently, the ends can only be wrapped radially and cannot be strengthened circumferentially, which is a bottleneck for improving the structural strength of the gas cylinders. This restricts the further improvement of the performance of high-pressure gas cylinders. In addition, the low circumferential strength makes the product vulnerable to damage and gas leakage during service. In addition, a common product that bears circumferential loads is the brake disc component. The material needs to bear a large circumferential load during service. Improving the circumferential fiber distribution during product structure design is conducive to further reducing the weight of the product and improving product performance. However, there is currently no annular woven fabric on the market, and the engineering community can only use carbon fiber woven fabrics that cross vertically in the longitudinal and transverse directions instead. When this kind of cross-woven fabric is used on a hollow annular composite brake disc that is subjected to circumferential force, the material performance cannot be fully utilized and the middle part must be cut off, resulting in a serious waste of carbon fiber resources. Similar products are currently only available on the market for prepreg tapes for dry winding impregnated with resin, and there is no supply of annular fiber fabric products for liquid resin winding of gas storage cylinders and carburizing processes of brake discs. Therefore, we propose an annular fiber woven fabric for composite materials and a preparation method thereof. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the current background technology. In order to achieve the above invention purpose, the present invention provides the following technical solutions: a circular fiber woven cloth for composite materials, including fibers for circular woven cloth, the fibers for circular woven cloth include but are not limited to one or more combinations of carbon fiber, glass fiber, aramid fiber, PBO fiber, ultra-high molecular weight polyethylene fiber, and the connection method between the circular fibers includes one or more combinations of particles, droplet adhesion, fiber fixation, and sewing.

[0005] As a preferred technical solution of the present invention, the production equipment of the annular fiber woven cloth includes tension unwinding, yarn unwinding, material spraying, heating, winding and rewinding, and a programming control system.

[0006] As a preferred technical solution of the present invention, spiral steps are distributed on the surface of the concave-convex annular fiber winding fixture of the annular fiber woven cloth.

[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 stepping motor and a lead screw nut, and the moving speed of the trolley is programmably controlled; the winding fixture is installed on a winding drive shaft perpendicular to the yarn spreading system, and is fixed with quick-release bearing supports at both ends. The winding and winding fixture is composed of a contoured core shaft and a baffle, and the contoured core shaft of the flat annular fabric cloth is a hollow ring, which is installed on the winding drive shaft; the core shaft is divided radially and assembled as a whole by screws.

[0008] As a preferred technical solution of the present invention, a spiral stepped winding step with a small draft angle along the axial direction is machined on the inclined part, and the outer circle position of the step is the size position of the inner circle of the fabric cloth layer; the baffle is 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 axially side by side on the flat winding woven cloth structure mandrel, and the flat fabric baffle and mandrel can be made of plastic, which can be removed as product protection carriers after winding; the concave or convex conversion woven cloth is used, and a layer of soft film is formed on the mold surface by spraying, electrophoresis, and blowing.

[0010] As a preferred technical solution of the present invention, the fixed bonding material component is selected from the composite material molding matrix component to include one or more combinations of resin system powder, asphalt, sizing agent, and organic solvent.

[0011] A method for preparing annular fiber woven cloth for composite materials, and a process for preparing convex annular fiber woven cloth;

[0012] Step S1: A circular fiber braiding cloth equipment structure for composite materials, wherein the mobile components installed on the mobile trolley include: a fiber tension unwinding mechanism for installing a carbon fiber roll, a magnetic powder brake tension unwinding mechanism and a fiber tension measuring roller and a control circuit to form a tension closed-loop control system; a hot air purge, a tension vibration unwinding roller and an unwinding roller to form an unwinding system; an adhesive spraying system, an adhesive hot air melting system, and a yarn width and position adjustment rod are installed on the mobile trolley; the mobile trolley is installed on a fixed chassis through a guide rail slider structure, and the mobile trolley moves along the guide rail by a driving system composed of a stepping motor and a precision lead screw nut; a profiling fixture and a baffle are installed on a driving system composed of a quick-release shaft seat, a driving motor, and a reducer through a rotating shaft;

[0013] Step S2: during the winding process, the carbon fiber passes through the fiber width, the position positioning rod, the yarn unwinding roller, the tension measuring roller, the width position positioning rod in sequence, to the space between the profiling fixture and the baffle, and is fixed to the rotating shaft using double-sided tape; the fiber tension is set to 0-10N, and the ratio of the walking speed of the winding shaft and the lead screw nut is set according to the pitch width on the profiling fixture so that for every rotation of the main shaft, the lead screw drives the trolley to evenly advance one pitch, the trolley does not move when the pitch is zero, and the moving speed of the trolley increases when the pitch increases; the hot air blowing and bonding material supply system are started, and the winding system winds the fiber with the molten adhesive into a disk, and when the fiber roll diameter reaches the threaded area of ​​the profiling fixture, the program starts the lead screw driving system, and the fiber yarn is profiled and wound along the threaded step on the profiling fixture until the winding is completed;

[0014] Step S3: remove the product together with the profiling fixture, baffle and rotating shaft, carefully remove the profiling fixture, remove the fiber ring fabric belt bonded as a whole by the adhesive, and put it into a plastic bag with a profiling EPS foam pad for packaging and storage after passing the quality inspection.

[0015] As the preferred technical solution of the present invention, the flat ring woven cloth production process

[0016] Step S1: A structure and working principle of an annular fiber woven cloth equipment for composite materials, the components installed on the fixed equipment stand are: a carbon fiber roll on a fiber tension unwinding mechanism, a tension unwinding mechanism and a fiber tension measuring roller constitute a tension closed-loop control system; a hot air blowing and a tension vibration unwinding roller constitute an unwinding system; an adhesive spraying system, an adhesive hot air melting bonding system, and a yarn width and position adjustment rod are installed on a fixed bracket; a layer of glass fiber fabric mesh is thermally attached to both sides of a flat clamp, and the flat clamp is installed on a rotating shaft supported by a quick-release shaft seat, and the rotating shaft is driven by a motor through a reducer; with the position of the material trough on the flat clamp as the position reference, multiple groups can be set along different radial radii and different angles to achieve simultaneous winding of multiple groups to speed up production efficiency;

[0017] Step S2: The carbon fiber drawn from the carbon fiber reel controlled by the closed-loop tension passes through the fiber width position positioning rod, the yarn unwinding roller, the tension measuring roller, the width position positioning rod to the flat fixture in sequence; the fiber is fixed between the two baffles of the winding shaft using double-sided tape; the fiber tension is set to 0-10N, the hot air blowing and the bonding material supply system are started, and the winding system winds the fiber with the molten adhesive into a disk until the winding is completed;

[0018] Step S3: remove the product together with the fixture and the rotating shaft, carefully remove the fixture, put it into the oven for heating, and after a small amount of resin particles in the reinforcing fabric and between the fiber bundles are melted, connect the annular fabric belt into a whole, cool it down and remove it, and bag and store it after passing the quality inspection.

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

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The design scheme is used to produce circumferential fiber woven fabrics for flat or concave-convex circular composite laminate products, which provides a new structural design and production process solution for circumferential force composite products, improves material utilization and reduces product production costs.

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

[0023] 3. The use of annular unidirectional reinforced fibers provides a new feasible technical solution for improving the structural strength and air tightness of gas cylinder end caps, and provides a new feasible technical approach for the development and production of IV and V type gas storage cylinders with larger volumes and higher pressures.

[0024] 4. The promotion and application of flat annular unidirectional braided belts in the field of brake discs can not only improve material utilization according to stress laying, but also reduce the volume of carbon fiber material cut in the middle of the brake disc ring, save materials and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of a semicircular concave-convex structure annular fiber winding device according to Example 1 of the present invention;

[0026] Figure 2 A simplified schematic diagram of a flat plate structure winding device according to Embodiment 2 of the present invention;

[0027] Figure 3 A simplified schematic diagram of a flat plate structure winding device according to Embodiment 2 of the present invention;

[0028] Figure 4This is a schematic diagram of the partial structure of the annular fiber winding device with a semicircular concave-convex structure in Example 1 of the present invention.

[0029] Indicated in the figure:

[0030] 1. Fiber tension unwinding mechanism; 2. Carbon fiber reel; 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. Rotating shaft; 11. Quick release shaft seat; 12. Driving motor; 13. Reducer; 14. Profiling fixture; 15. Baffle; 16. Fixed chassis; 17. Moving trolley; 18. Roller shaft; 19. Precision screw nut. DETAILED DESCRIPTION

[0031] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[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 represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features and technical solutions in the embodiments can be combined with each other without conflict. It should be noted that similar numbers and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0033] Example 1: Please refer to Figure 1-Figure 4 A circular fiber woven cloth for composite materials, including fibers for the circular woven cloth, wherein the fibers for the circular woven cloth include but are not limited to one or a combination of carbon fiber 3, glass fiber, aramid fiber, PBO fiber, and ultra-high molecular weight polyethylene fiber, and the connection method between the circular fibers includes one or a combination of particles, droplet adhesion, fiber fixing, and sewing.

[0034] The production equipment of circular fiber woven cloth includes tension unwinding, yarn unwinding, material spraying, heating, winding and programming control system.

[0035] The surface of the concave-convex annular fiber winding fixture of the annular fiber woven cloth is distributed with spiral steps.

[0036] Carbon fiber 3, the yarn spreading device is installed on a moving trolley 17 driven by a stepping motor and a lead screw nut, and the moving speed of the trolley is programmable and controlled; the winding fixture is installed on a winding drive shaft perpendicular to the yarn spreading system, and is fixed with quick-release bearing supports at both ends. The winding and winding fixture is composed of a contoured core shaft and a baffle 15. The contoured core shaft of the flat annular fabric cloth is a hollow ring, which is installed on the winding drive shaft; the core shaft is divided radially and assembled as a whole by screws.

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

[0038] A plurality of winding mandrels and unwinding and unwinding devices are installed axially side by side on the mandrel of the flat winding woven cloth structure. The flat fabric baffle 15 and the mandrel can be made of plastic and can be removed as a product protection carrier after winding. The concave or convex conversion woven cloth is used, and a layer of soft film is formed on the mold surface by spraying, electrophoresis, and blowing.

[0039] The fixed bonding material component is selected from the composite material molding matrix component and includes one or more combinations of resin system powder, asphalt, sizing agent, and organic solvent.

[0040] A method for preparing annular fiber woven cloth for composite materials, and a process for preparing convex annular fiber woven cloth;

[0041] Step S1: A composite material annular fiber braiding cloth equipment structure, the mobile components installed on the mobile trolley 17 are: a fiber tension unwinding mechanism 1 for installing a carbon fiber roll 2, a magnetic powder brake tension unwinding mechanism 1 and a fiber tension measuring roller 6 and a control circuit form a tension closed-loop control system; hot air blowing 4 and a tension vibration unwinding roller 5 and an unwinding roller 6 form an unwinding 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 mobile trolley 17; the mobile trolley 17 is installed on a fixed chassis 16 through a guide rail slider structure, and the mobile trolley 17 moves along the guide rail 17 by a drive system composed of a stepping motor 12 and a precision lead screw nut 19; a profiling fixture 14 and a baffle 15 are installed on a drive system composed of a quick-release shaft seat 11, a drive motor 12, and a reducer 13 through a rotating shaft 10;

[0042] Step S2: during the winding process, the carbon fiber 2 passes through the fiber width, the position positioning rod 9, the yarn spreading roller 5, the tension measuring roller 6, the width position positioning rod 9 in sequence, to the profiling fixture 14 and the baffle 15, and is fixed to the rotating shaft using double-sided tape; the fiber tension is set to 0-10N, and the ratio of the walking speed of the winding shaft and the lead screw nut is set according to the pitch width on the profiling fixture 14 so that for every rotation of the main shaft, the lead screw drives the trolley to evenly advance one pitch, the trolley does not move when the pitch is zero, and the moving speed of the trolley increases when the pitch increases; the hot air purge 4, 8 and the bonding material supply system 7 are started, and the winding system winds the fiber with the molten adhesive into a disk, and when the fiber roll diameter reaches the threaded area of ​​the profiling fixture, the program starts the lead screw drive system, and the fiber yarn is profiled and wound along the threaded step on the profiling fixture until the winding is completed;

[0043] Step S3: Remove the product together with the profiling fixture 14, the baffle 15 and the rotating shaft 10, carefully remove the profiling fixture, remove the fiber ring fabric belt bonded as a whole by the adhesive, and put it into a plastic bag with a profiling EPS foam pad for packaging and storage after passing the quality inspection.

[0044] Flat endless woven fabric production process

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

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

[0047] Step S3: remove the product together with the clamp 15 and the rotating shaft 11, carefully remove the clamp, put it into the oven for heating, and after a small amount of resin particles in the reinforcing fabric and between the fiber bundles are melted, connect the annular fabric belt into a whole, cool it down and remove it, and bag and store it after passing the quality inspection.

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

[0049] Embodiment 2: A process for preparing a convex annular fiber woven cloth for composite materials, the specific steps are as follows:

[0050] Step S1: A composite material annular fiber woven cloth equipment structure, the mobile components installed on the mobile trolley 17 are: a fiber tension unwinding mechanism 1 for installing a carbon fiber roll 2, a magnetic powder brake tension unwinding mechanism 1 and a fiber tension measuring roller 6 and a control circuit form a tension closed-loop control system; hot air blowing 4 and tension vibration unwinding rollers 5 and 6 form an unwinding 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 mobile trolley 17. The mobile trolley 17 is installed on the fixed chassis 16 through a guide rail slider structure, and the mobile 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. The profiling fixture 14 and the baffle 15 are installed on the drive system composed of a quick-release shaft seat 11, a drive motor 12, and a reducer 13 through a rotating shaft 10.

[0051] Step S2: winding process, carbon fiber 2 passes through fiber width, position positioning rod 9, yarn unwinding roller 5, tension measuring roller 6, width position positioning rod 9 in sequence, to the profiling fixture 14 and baffle 15 and is fixed on the rotating shaft using double-sided adhesive. Set fiber tension 0-10N, set the ratio of winding shaft and lead screw nut travel speed by pitch width on profiling fixture 14 so that the main shaft rotates once, and the lead screw drives the trolley to evenly advance a pitch, the pitch is zero and the trolley does not move, and the pitch increases and the trolley moves faster. Start hot air purge 4, 8 and bonding material supply system 7, the winding system will be wound into a disk with the fiber with molten adhesive, and the program starts the lead screw drive system after the fiber roll diameter reaches the profiling fixture threaded area, and the fiber yarn is wound along the threaded step on the profiling fixture until winding is completed.

[0052] Step S3: Remove the product together with the profiling fixture 14, the baffle 15 and the rotating shaft 10, carefully remove the profiling fixture, and remove the fiber ring-shaped fabric belt bonded as a whole by the adhesive, such as Figure 1 As shown, after passing the quality inspection, it is packed in a plastic bag with a contoured EPS foam pad and put into storage.

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

[0054] Step S2: The carbon fiber 3 drawn from the closed-loop tension-controlled carbon fiber reel 2 passes through the fiber width position positioning rod 10, the yarn unwinding roller 5, the tension measuring roller 7, the width position positioning rod 10 to the flat fixture 15 in sequence. The fiber is fixed between the two baffles of the winding shaft using double-sided tape. The fiber tension is set to 0-10N, the hot air blowing 4, 9 and the bonding material supply system 8 are started, and the winding system winds the fiber with the molten adhesive into a disk until the winding is completed.

[0055] Step S3: Remove the product together with the fixture 15 and the rotating shaft 11, carefully remove the fixture, put it into the oven for heating, and after a small amount of resin particles in the reinforcing fabric and between the fiber bundles are melted, connect the annular fabric belt into a whole, cool it down and remove it. Figure 2 As shown, after passing the quality inspection, the products are bagged and put into storage.

[0056] During the use of the present invention, the carbon fiber and the yarn spreading device are installed on a mobile trolley driven by a stepper motor and a lead screw nut, and the moving speed of the trolley is controlled by programming. The fibers are spread into fiber bundles with uniform width and thickness under the action of the closed-loop tension control, unwinding, blowing and vibration yarn spreading devices also installed on the mobile trolley. The winding fixture is installed on a winding drive shaft perpendicular to the yarn spreading system, and is fixed by quick-release bearing supports at both ends. The drive shaft is driven by a high-precision stepper motor through a reducer, and the motor speed is controlled by programming together with the driving of the mobile trolley. The winding and winding fixture is composed of a profiling mandrel and a baffle. The profiling mandrel of the flat annular fabric cloth is a hollow circular ring, which can be installed on the winding drive shaft; the convex and concave profiling mandrels are designed and processed according to the convex shape, and the geometric dimensions of the shape are accurately designed according to the shape of the woven cloth product, the thickness position of the woven cloth layer, and the processing depth; the mandrel is divided radially and assembled as a whole by screws, which is convenient for subsequent removal. The spiral stair winding step with a small draft angle along the axial direction is machined on the inclined part. At this time, the outer circle position of the step is the size position of the inner circle of the fabric layer. The baffle is designed according to the winding size and shape, and is a metal or plastic plate that limits the vertically distributed end winding fibers. For flat winding woven fabrics with simple structures, multiple winding mandrels and unwinding and yarn unwinding devices can be installed side by side along the axial direction on the structural mandrel, and the walking trolley can be simplified to a fixed mode. The flat fabric baffle and mandrel can be made of plastic, and after winding, it can be removed as a product protection carrier. For personalized concave or convex conversion woven fabrics, the mold surface can be sprayed, electrophoresed, blown / blistered to form a layer of soft film, which is convenient for demoulding and also protects the woven fabric products during transportation and use.

[0057] Before starting winding, install and debug the fixture, and use double-sided tape to fix the fiber to the starting winding position of the reel. The fiber roll can be fixed in two ways: powder bonding method and yarn-assisted fixing method. The bonding method selects the corresponding formula material according to the final molding matrix type of the product. During the winding process, some solid micropowders or liquid droplets are adhered to the fiber surface and the filament bundles by infiltration, spraying, electrostatic adsorption, and scraping. Through heating and solvent volatilization, the particles or droplets are infiltrated and bonded between the wound fiber bundles as a whole, which is convenient for use without affecting the quality of the final product. The fixed bonding material component is selected from the composite material molding matrix components, including one or more combinations of resin system powder, asphalt, sizing agent, and organic solvent. Yarn fixing method: the yarn or gauze is woven with cotton thread, nylon thread, carbon fiber, glass fiber, and aramid fiber. Before use, the gauze is moistened with a heated latent adhesive system or the yarn itself is heated to become sticky, and then laid on both sides of the molding plywood. After cooling to room temperature, the fixation is completed. After winding, the clamp is removed and the whole is heated until the resin is melted for the second time to connect the annular fibers in contact with it into a whole. After removal and quality inspection, it is packaged as annular fiber woven cloth products.

[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 above specific implementation methods. Therefore, any modification or replacement of the present invention; and all technical solutions and improvements thereof that do not depart from the spirit and scope of the invention are included in the scope of the claims of the present invention.

Claims

1. A circular fiber woven cloth for composite materials, characterized in that: The invention comprises fibers for annular woven cloth, wherein the fibers for annular woven cloth include but are not limited to one or a combination of carbon fiber (3), glass fiber, aramid fiber, PBO fiber, ultra-high molecular weight polyethylene fiber, and the connection method between the annular fibers includes one or a combination of particles, droplet adhesion, and fiber sewing fixation.

2. The annular fiber woven cloth for composite materials according to claim 1, characterized in that: The production equipment of circular fiber woven cloth includes tension unwinding, yarn unwinding, material spraying, heating, winding and programming control system.

3. The annular fiber woven cloth for composite materials according to claim 2, characterized in that: The surface of the concave-convex annular fiber winding fixture of the annular fiber woven cloth is distributed with spiral steps.

4. The annular fiber woven cloth for composite materials according to claim 3, characterized in that: The carbon fiber (3) and the yarn spreading device are installed on a moving trolley (17) driven by a stepping motor and a lead screw nut, and the moving speed of the trolley is controlled by programming; the winding fixture is installed on a winding drive shaft perpendicular to the yarn spreading system, and is fixed by quick-release bearing supports at both ends; the winding and winding fixture is composed of a contoured mandrel and a baffle (15); the contoured mandrel of the flat annular fabric cloth is a hollow ring and is installed on the winding drive shaft; the mandrel is divided radially and assembled into a whole by screws.

5. The annular fiber woven cloth for composite materials according to claim 4, characterized in that: A spiral stair winding step with a small draft angle along the axial direction is machined on the inclined part, and the outer circle position of the step is the size position of the inner circle of the fabric layer; the baffle (15) is set according to the winding size and shape, and the baffle (15) is a metal or plastic plate that limits the vertically distributed end winding fibers.

6. The annular fiber woven cloth for composite materials according to claim 5, characterized in that: A plurality of winding mandrels and unwinding and unwinding devices are installed axially side by side on the mandrel of the flat winding woven fabric structure; the flat fabric baffle (15) and the mandrel can be made of plastic and can be removed as a product protection carrier after winding; the concave or convex conversion woven fabric is used, and a layer of soft film is formed on the mold surface by spraying, electrophoresis, or blow molding.

7. The annular fiber woven cloth for composite materials according to claim 6, characterized in that: The fixed bonding material component is selected from the composite material molding matrix component and includes one or more combinations of resin system powder, liquid resin, asphalt, sizing agent, and organic solvent.

8. A method for preparing annular fiber woven cloth for composite materials, characterized in that: Preparation process of convex annular fiber woven cloth; Step S1: A composite material annular fiber woven cloth equipment structure, wherein the movable components installed on the movable trolley (17) include: a fiber tension unwinding mechanism (1) for installing a carbon fiber roll (2), a magnetic powder brake tension unwinding mechanism (1) and a fiber tension measuring roller (6) and a control circuit forming a tension closed-loop control system; a hot air blowing (4) and a tension vibration unwinding roller (5) and an unwinding roller (6) forming an unwinding 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 movable trolley (17); the movable trolley (17) is installed on a fixed chassis (16) through a guide rail slider structure, and the movable trolley (17) moves along the guide rail (17) by a driving system consisting of a stepping motor (12) and a precision lead screw nut (19); a contour clamp (14) and a baffle (15) are installed on a driving system consisting of a quick-release shaft seat (11), a driving motor (12), and a reducer (13) through a rotating shaft (10); Step S2: during the winding process, the carbon fiber (2) sequentially passes through the fiber width, the position positioning rod (9), the yarn spreading roller (5), the tension measuring roller (6), the width position positioning rod (9), to the profiling fixture (14) and the baffle (15), and is fixed on the rotating shaft using double-sided tape; the fiber tension is set to 0-10N, and the ratio of the walking speed of the winding shaft and the lead screw nut is set according to the pitch width on the profiling fixture (14) so ​​that the lead screw drives the trolley to evenly advance one pitch for every rotation of the main shaft. When the pitch is zero, the trolley does not move, and when the pitch increases, the moving speed of the trolley increases; the hot air blowing (4) and the bonding material supply system (7) are started, and the winding system winds the fiber with the molten adhesive into a disk. When the fiber roll diameter reaches the threaded area of ​​the profiling fixture, the program starts the lead screw driving system, and the fiber yarn is profiled and wound along the threaded step on the profiling fixture until the winding is completed; Step S3: Remove the product together with the profiling fixture (14), the baffle (15) and the rotating shaft (10), carefully remove the profiling fixture, remove the fiber ring-shaped fabric belt bonded into a whole by the adhesive, and put it into a plastic bag with a profiling EPS foam pad for packaging and storage after passing the quality inspection.

9. The method for preparing annular fiber woven cloth for composite materials according to claim 8, characterized in that: Flat endless woven fabric production process Step S1: A structure and working principle of an annular fiber woven cloth equipment for composite materials, wherein the components installed on the fixed equipment stand include: a carbon fiber roll (2) on a fiber tension unwinding mechanism (1), the tension unwinding mechanism (1) and the fiber tension measuring roller (7) forming a tension closed-loop control system; a hot air blowing (4) and a tension vibration unwinding roller (5) forming an unwinding system; an adhesive spraying system (8), an adhesive hot air melting bonding system (9), and a yarn width and position adjustment rod (10) are installed on a fixed bracket; a layer of glass fiber fabric net is thermally attached to both sides of a flat clamp (15), and the flat clamp is installed on a rotating shaft (11) supported by a quick-release shaft seat (12), and the rotating shaft (11) is driven by a motor (14) through a reducer (13); (1) to (10) form a discharge, unwinding, and bonding functional module, and the material trough position on the flat clamp (15) is a position reference, and multiple groups can be set along different radial radii and different angles to achieve simultaneous winding of multiple groups to increase production efficiency; Step S2: The carbon fiber (3) drawn from the carbon fiber reel (2) controlled by closed-loop tension passes through the fiber width position positioning rod (10), the yarn spreading roller (5), the tension measuring roller (7), the width position positioning rod (10) to the flat clamp (15) in sequence; the fiber is fixed between two baffles of the winding shaft using double-sided tape; the fiber tension is set to 0-10N, the hot air blowing (4) and the bonding material supply system (8) are started, and the winding system winds the fiber with molten adhesive into a disk until the winding is completed; Step S3: remove the product together with the clamp (15) and the rotating shaft (11), carefully remove the clamp, put it into an oven for heating, and after a small amount of resin particles in the reinforcing fabric and between the fiber bundles are melted, connect the annular fabric belt into a whole, cool it down and remove it, and bag and store it after passing the quality inspection.

10. The method for preparing annular fiber woven cloth for composite materials according to claim 9, characterized in that: The yarn or mesh is woven from cotton thread, nylon thread, carbon fiber, glass fiber, and aramid fiber.

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