Bionic disc eagle kite based on silk coagulation composite membrane and gradient curing manufacturing process

Abstract

The bionic disc eagle kite comprises a bionic skeleton, a bionic skin is arranged at the bottom of the bionic skeleton, and the bionic skeleton and the bionic skin are connected through an aramid fiber flexible bandage. The bionic skin is composed of a base layer, a first anti-tear layer, a first elastic layer, a first weather-proof layer, a second anti-tear layer, a second elastic layer, a second weather-proof layer and a waterproof layer, and the first anti-tear layer is arranged at the top of the base layer. The silk coagulation composite film is adopted as the base layer of the skin, the first anti-tearing layer, the first elastic layer, the first weather-proof layer, the second anti-tearing layer, the second elastic layer, the second weather-proof layer and the waterproof layer are overlaid, the weight of the skin in use is reduced through the eight-layer structure, the flying starting difficulty is reduced, the skin can lift off in the breeze environment, and the service life of the skin is prolonged. By arranging the waterproof layer, the waterproof performance of the skin is improved, and the kite can still fly continuously in a humid environment or under the condition of light rain.

Description

Technical Field

[0001] The invention relates to the technical field of bionic hawk kites, in particular to a bionic hawk kite based on a silk-coagulated composite film and a gradient solidification manufacturing process. Background Art

[0002] Panying kites, also known as hovering kites, are traditionally made of cotton, linen, and ordinary synthetic fabrics as their skin materials, which have the following disadvantages: they are heavy, with the cotton and linen skin weighing 300-500g / m 2 As a result, the overall weight of the kite generally exceeds 350g, making it difficult to launch and start, and difficult to take off in a breeze. It also has poor wind resistance and is easily damaged in strong winds. At the same time, it is not weather-resistant enough, and the skin is prone to aging and brittleness due to long-term exposure to ultraviolet rays and rain.

[0003] Moreover, traditional frames are mostly made of glass fiber or bamboo strips, which are too rigid but not tough enough. They are prone to brittle fracture when hit by strong winds and are not lightweight enough. The density of bamboo strip skeleton is about 0.7g / cm 3 , which cannot meet the lightweight and high-strength requirements of high-end kites. In addition, the traditional skeleton topology is simple and cannot simulate the mechanical distribution of the wing roots of the eagle, which are strong and tough and the wing tips are light, resulting in poor flight stability. In addition, the overall waterproof performance of the kite is poor, which makes it impossible to fly normally and continuously in humid environments or light rain. For this reason, we provide a bionic eagle kite based on silk-condensed composite film and a gradient curing production process. Summary of the Invention

[0004] The purpose of the present invention is to provide a bionic hawk kite based on a silk-coated composite film and a gradient solidification manufacturing process to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a bionic hawk kite based on a silk-coated composite membrane, comprising a bionic skeleton, a bionic skin being provided at the bottom of the bionic skeleton, the bionic skeleton and the bionic skin being connected by an aramid flexible strap, the bionic skin being composed of a base layer, a first tear-resistant layer, a first elastic layer, a first weather-resistant layer, a second tear-resistant layer, a second elastic layer, a second weather-resistant layer and a waterproof layer, and the first tear-resistant layer being provided on the top of the base layer.

[0006] Preferably, the first elastic layer is arranged on the top of the first tear-resistant layer, the first weather-resistant layer is arranged on the top of the first elastic layer, the second tear-resistant layer is arranged at the bottom of the base layer, the second elastic layer is arranged at the bottom of the second tear-resistant layer, and the second weather-resistant layer is arranged at the bottom of the second elastic layer, and the waterproof layer is respectively arranged on the surfaces of the base layer, the first tear-resistant layer, the first elastic layer, the first weather-resistant layer, the second tear-resistant layer, the second elastic layer and the second weather-resistant layer.

[0007] Preferably, the surface of the bionic skeleton is coated with a nano coating, the thickness of the nano coating is 10-50 nm, and the bionic skeleton is made of carbon fiber.

[0008] Preferably, the base layer is made of a silk-coagulated composite membrane, which is made of a composite of silk protein and polyester fiber, wherein the silk protein and polyester fiber are mixed in a ratio of 40:60% and have a thickness of 0.2-0.5 mm.

[0009] Preferably, the first tear-resistant layer and the second tear-resistant layer are both made of aramid fiber mesh, and the aramid fiber mesh has a surface density of 15-25 g / m 2 , thickness is 0.08-0.12mm.

[0010] Preferably, the first elastic layer and the second elastic layer are both made of a silica gel microbubble membrane, wherein the silica gel microbubble membrane is a closed-cell silica gel with a density of 0.2-0.3 g / cm 3 , thickness is 0.1-0.15mm.

[0011] Preferably, the first weather-resistant layer and the second weather-resistant layer are both made of UV-resistant polyurethane, wherein the UV polyurethane contains 5-8% nano-TiO2 polyurethane resin, has a particle size of 20-40 nm, and a thickness of 0.1-0.12 mm.

[0012] Preferably, the waterproof layer is made by coating SiO2 nanoparticles, and the particle size of the SiO2 nanoparticles is 10-30nm and the thickness is 0.05-0.1mm.

[0013] A gradient curing manufacturing process for a bionic hawk kite based on a silk-condensed composite membrane is disclosed. The manufacturing process is applicable to the bionic hawk kite based on the silk-condensed composite membrane and specifically includes the following processes:

[0014] S1. Carbon fiber weaving and shaping: Use T700 grade carbon fiber filaments with a tensile strength of ≥500MPa and a diameter of 7μm. Design a weaving mold based on the topological structure of the wing skeleton of the eagle, making the wing root thick and the wing tip thin. Then, use a high-temperature shaping furnace to shape the filaments at 300℃ for 10-15 minutes, cool them to room temperature, and then remove them to ensure that the initial strength of the skeleton is ≥450MPa.

[0015] S2. Coating: Prepare a nano-SiO2 suspension containing 5-10% silane coupling agent with a particle size of 10-30 nm, and then use ultrasonic spraying to control the thickness to 10-50 nm to ensure that the coating evenly covers the surface of the bionic skeleton 1, and then dry at room temperature for 2 hours;

[0016] S3. Skin preparation: Silk protein and polyester fiber are mixed in a weight ratio, deionized water is added and stirred into a uniform sol, and coated by a precision coating machine. The wing root area is coated with a knife coating method to a thickness of 0.5 mm, and the wing tip area is coated to a thickness of 0.2 mm. The aramid fiber mesh is cut, and the upper tear-resistant layer covers the upper surface of the base layer, and the lower tear-resistant layer covers the lower surface of the base layer. They are symmetrically arranged with the upper layer, and then bonded by a hot pressing process. The closed-cell silicone microbubble film is cut into the same size as the tear-resistant layer. The upper elastic layer is laid on the upper tear-resistant layer and fixed with silicone adhesive. The lower elastic layer is laid under the lower tear-resistant layer. The operation is symmetrical, and then cured at a constant temperature of 60°C for 10 minutes. A polyurethane resin containing 5-8% nano-TiO2 and a solid content of 50% is sprayed on the surface of the upper elastic layer and the lower weather-resistant layer is sprayed on the surface of the lower elastic layer. The layers are cured at 100°C and cross-linked for 20 minutes to form a weather-resistant barrier.

[0017] S4. Waterproof treatment: The bottom layer is coated with fluorocarbon resin with a thickness of 0.03-0.05mm, and the surface layer is sprayed with nano-SiO2 particles with a thickness of 0.02-0.05mm, and then cured and irradiated with ultraviolet light with an energy density of 5-10J / cm 2 , time 5-10min, forming a hydrophobic surface with a contact angle ≥160°;

[0018] S5. Partitioned gradient curing: Curing is performed in a gradient curing furnace, which can control temperature and pressure in different zones. The wing root area is cured at 120°C, with a pressure of 0.4-0.6 MPa for 25-35 minutes. The wing tip area is cured at 80°C, with a pressure of 0.2-0.4 MPa for 15-25 minutes. The area is then naturally cooled to room temperature to avoid cracking of the skin caused by sudden cooling.

[0019] S6. Connecting the skeleton and the skin: Place the bionic skeleton 1 on the bionic skin and fix the skeleton and the skin with aramid flexible straps every 5 cm.

[0020] Preferably, the radian of the wing is controlled at 10-20° by adjusting the tension of the aramid flexible straps to simulate the aerodynamic shape of a hawk spreading its wings, and epoxy resin adhesive is used to reinforce the key nodes to ensure the stability of the radian.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention adopts a silk-coated composite film as a base layer for the skin, and stacks a first tear-resistant layer, a first elastic layer, a first weather-resistant layer, a second tear-resistant layer, a second elastic layer, a second weather-resistant layer and a waterproof layer. The eight-layer structure reduces the weight and thickness of the skin when in use, and at the same time reduces the difficulty of launching and starting, so that the kite can be taken off in a breeze environment. By setting the base layer, the first tear-resistant layer and the second tear-resistant layer, the wind resistance and tear resistance of the skin are improved, and the service life of the skin is extended. By setting the first elastic layer and the second elastic layer, the skin can absorb the impact energy of flight vibration, buffer the hard contact between the skeleton and the skin, and avoid rupture caused by local stress concentration. By setting the first weather-resistant layer and the second weather-resistant layer, the weather resistance of the skin surface is improved, and the aging phenomenon caused by long-term exposure to ultraviolet rays is avoided. By setting the waterproof layer, the waterproof performance of the skin is improved, so that the kite can continue to fly in a humid environment or in light rain.

[0023] 2. The bionic skeleton of the present invention is made of carbon fiber, which increases the service life of the bionic skeleton and further improves the tensile and wind resistance of the bionic skeleton. Moreover, the skeleton made of carbon fiber is light in weight and can be taken off in a breeze environment. The elastic buffering of the aramid flexible straps makes the wing surface evenly stressed during flight. At the same time, the zoned curing process realizes the improvement of the tensile strength of the wing root area, adapting to high force requirements, and retaining the flexibility of the wingtip area. The radian of the wing surface is controlled at 10-20° through the tension of the straps, simulating the aerodynamic shape of a hawk spreading its wings. The lift is sufficient in a breeze environment and the flight stability is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0025] Figure 2 Schematic diagram of the three-dimensional structure of the bionic skeleton and aramid flexible straps of the present invention;

[0026] Figure 3 Schematic diagram of the three-dimensional structure of the bionic skin of the present invention;

[0027] Figure 4 It is a schematic diagram of the three-dimensional structure of the bottom view of the present invention;

[0028] Figure 5 This is a structural cross-sectional view of the front view of the bionic skin of the present invention;

[0029] Figure 6 A structural cross-sectional view of the front view of the bionic skeleton and nanocoating of the present invention;

[0030] Figure 7 It is a schematic diagram of the three-dimensional structure of the aramid flexible binding belt of the present invention.

[0031] In the figure: 1 bionic skeleton, 2 bionic skin, 201 base layer, 202 first tear-resistant layer, 203 first elastic layer, 204 first weather-resistant layer, 205 second tear-resistant layer, 206 second elastic layer, 207 second weather-resistant layer, 208 waterproof layer, 3 aramid flexible strap. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] See also Figure 1-7 A bionic disc eagle kite based on silk-coated composite membrane includes a bionic skeleton 1, a bionic skin 2 is provided at the bottom of the bionic skeleton 1, a surface of the bionic skeleton 1 is coated with a nano coating 101, the thickness of the nano coating 101 is 10-50nm, the bionic skeleton 1 is made of carbon fiber, and the bionic skeleton 1 and the bionic skin 2 are connected by an aramid flexible strap 3. By setting up a carbon fiber skeleton, the wind resistance level is only increased to level 4-6, and the weight is reduced to 203g, which reduces the breakage rate and extends the service life. The bionic skeleton 1 imitates the skeletal topology of the disc eagle's wing, and the diameter of the wing root area is 3-5 times that of the wing tip area, simulating the mechanical distribution of the thick and pointed eagle wing root. The thickness of the wing root area of ​​the bionic skin 2 is 0.5mm, which is 2.5 times that of the wing tip area 0.2mm. To mimic the morphological characteristics of an eagle's wing, which is thick at the root and thin at the tip, the bionic skeleton 1 is based on the skeleton of a hawk's wing and adopts a hollow carbon fiber structure, imitating the hollow weight-reducing characteristics of the eagle's bone. The design of thick wing root and thin wing tip adapts to the requirements of high force at the root and flexibility at the tip during flight. The bionic skin 2 replicates the aerodynamic shape of the eagle's wing in flight through thickness gradient and curvature control, increasing the kite's lift-to-drag ratio by 20%. The hovering stability is significantly better than that of traditional structures. Nano-coating 101 enhances the weather resistance of the carbon fiber skeleton, resists the erosion of the skeleton by outdoor ultraviolet rays and moisture, extends its service life, improves the surface roughness of the skeleton, and enhances the friction with the aramid flexible strap 3 to prevent the strap from sliding during flight, forming a physical barrier, reducing wear at the contact between the skeleton and the skin, and adapting to long-term dynamic force scenarios.

[0034] The bionic skin 2 consists of a base layer 201, a first tear-resistant layer 202, a first elastic layer 203, a first weather-resistant layer 204, a second tear-resistant layer 205, a second elastic layer 206, a second weather-resistant layer 207 and a waterproof layer 208. The first tear-resistant layer 202 is arranged on the top of the base layer 201. The base layer 201 is made of a silk-coated composite membrane. The silk-coated composite membrane is made of a composite of silk protein and polyester fiber. The silk protein and polyester fiber are mixed in a ratio of 40:60% and a thickness of 0.5 mm. The silk-coated composite membrane is lightweight and has a density of ≤0.8 g / cm 3 , high strength, tensile strength ≥ 25MPa, good flexibility, elongation at break ≥ 30%, the silk-coagulated composite membrane combines the natural flexibility of silk protein with the mechanical strength of polyester fiber, wherein the silk protein gives the membrane good deformation ability, adapting to the aerodynamic deformation during kite flight, and the polyester fiber enhances the structural stability. After the two are combined, they can meet the load-bearing requirements of the skin and support the overall weight reduction goal through the low-density characteristics. The first elastic layer 203 is arranged on the top of the first tear-resistant layer 202, the first weather-resistant layer 204 is arranged on the top of the first elastic layer 203, and the second tear-resistant layer 205 is arranged at the bottom of the base layer 201. The first tear-resistant layer 202 and the second tear-resistant layer 205 are both made of aramid fiber mesh, and the aramid fiber mesh surface density is 15-25g / m 2 The thickness is 0.1mm. The second elastic layer 206 is arranged at the bottom of the second tear-resistant layer 205. The first elastic layer 203 and the second elastic layer 206 are both made of silicone microbubble film. The silicone microbubble film is a closed-cell structure silicone with a density of 0.2-0.3g / cm 3 , with a thickness of 0.15mm, the second weather-resistant layer 207 is arranged at the bottom of the second elastic layer 206, the first weather-resistant layer 204 and the second weather-resistant layer 207 are both made of anti-UV polyurethane, the UV polyurethane contains 5-8% nano-TiO2 polyurethane resin, the particle size is 20-40nm, and the thickness is 0.12mm. The waterproof layer 208 is respectively arranged on the surface of the base layer 201, the first tear-resistant layer 202, the first elastic layer 203, the first weather-resistant layer 204, the second tear-resistant layer 205, the second elastic layer 206 and the second weather-resistant layer 207, and the waterproof layer 208 It is made by coating SiO2 nanoparticles with a particle size of 10-30nm and a thickness of 0.1mm. The SiO2 nanoparticles in the waterproof layer 208 not only form a hydrophobic surface, but its microscopic rough structure with a particle size of 10-30nm can also reduce the friction coefficient of air flowing through the skin and reduce aerodynamic resistance. At the same time, the composite structure of the fluorocarbon resin bottom layer and the SiO surface layer is friction-resistant, avoiding waterproof failure caused by rain erosion and ensuring the stability of continuous flight in humid environments. The total thickness of the bionic skin 2 is ≤1.2mm and the weight is only 25g / m 2 , much lower than the 300-500g / m of traditional single-layer cotton and linen skin 2, thus breaking through the technical understanding that multiple layers will inevitably increase weight.

[0035] The skin adopts a silk-coated composite film as the base layer 201, and is stacked with a first tear-resistant layer 202, a first elastic layer 203, a first weather-resistant layer 204, a second tear-resistant layer 205, a second elastic layer 206, a second weather-resistant layer 207 and a waterproof layer 208. The eight-layer structure reduces the weight of the skin when in use and reduces the difficulty of launching and starting, so that the kite can be taken off even in a breeze. By providing the base layer 201, the first tear-resistant layer 202 and the second tear-resistant layer 205, the wind resistance and tear resistance of the skin are improved, and the service life of the skin is extended. By providing the first elastic layer 203 and the second elastic layer 206, the skin can absorb the impact energy of flight vibration, buffer the hard contact between the skeleton and the skin, and avoid rupture caused by local stress concentration. By providing the first weather-resistant layer 204 and the second weather-resistant layer 207, the weather resistance of the skin surface is improved, avoiding the phenomenon of aging caused by long-term exposure to ultraviolet rays. By providing the waterproof layer 208, the waterproof performance of the skin is improved, so that the kite can continue to fly in a humid environment or in light rain.

[0036] See also Figure 1-7 A gradient curing process for manufacturing a bionic eagle kite based on a silk-condensed composite membrane is disclosed. The manufacturing process is applicable to a bionic eagle kite based on a silk-condensed composite membrane, and specifically includes the following processes:

[0037] S1. Carbon fiber weaving and shaping: Use T700 grade carbon fiber filaments with a tensile strength of ≥500MPa and a diameter of 7μm. Design the weaving mold according to the topological structure of the wing skeleton of the eagle, so that the wing root is thick and the wing tip is thin. Then pass it through a high-temperature shaping furnace for high-temperature shaping at 300℃ for 10-15 minutes, cool it to room temperature and take it out to ensure that the initial strength of the skeleton is ≥450MPa.

[0038] S2. Coating: Prepare a nano-SiO2 suspension containing 5-10% silane coupling agent with a particle size of 10-30 nm, and then use ultrasonic spraying to control the thickness to 10-50 nm to ensure that the coating evenly covers the surface of the bionic skeleton 1, and then dry at room temperature for 2 hours.

[0039] S3. Skin preparation: Silk protein and polyester fiber are mixed in a weight ratio, deionized water is added and stirred into a uniform sol, and coated by a precision coating machine. In the wing root area, the coating is applied to a thickness of 0.5 mm by blade coating, and in the wing tip area, the coating is applied to a thickness of 0.2 mm. The aramid fiber mesh is cut, and the upper tear-resistant layer covers the upper surface of the base layer 201, and the lower tear-resistant layer covers the lower surface of the base layer 201. They are symmetrically arranged with the upper layer, and then bonded by a hot pressing process. The closed-cell silicone microbubble film is cut into the same size as the tear-resistant layer. The upper elastic layer is laid on the upper tear-resistant layer and fixed with silicone adhesive. The lower elastic layer is laid under the lower tear-resistant layer. The operation is symmetrical, and then cured at a constant temperature of 60°C for 10 minutes. The polyurethane resin containing 5-8% nano-TiO2 and a solid content of 50% is sprayed on the surface of the upper elastic layer and the lower weather-resistant layer is sprayed on the surface of the lower elastic layer. The layers are cured at 100°C and cross-linked for 20 minutes to form a weather-resistant barrier.

[0040] S4. Waterproof treatment: The bottom layer is coated with fluorocarbon resin with a thickness of 0.03-0.05mm, and the surface layer is sprayed with nano-SiO2 particles with a thickness of 0.02-0.05mm. Then it is cured and irradiated with ultraviolet light with an energy density of 5-10J / cm2 for 5-10min to form a hydrophobic surface with a contact angle ≥160°.

[0041] S5. Partitioned gradient curing: Curing is carried out in a gradient curing furnace, which can control temperature and pressure in different zones. The curing temperature of the wing root zone is 120°C, the pressure is 0.4-0.6MPa, and the time is 25-35min. The curing temperature of the wing tip zone is 80°C, the pressure is 0.2-0.4MPa, and the time is 15-25min. Then it is naturally cooled to room temperature to avoid cracking of the skin caused by sudden cooling.

[0042] S6. Connect the skeleton and skin: Place the bionic skeleton 1 on top of the bionic skin 2, and use aramid flexible straps 3 to fix the skeleton and skin every 5 cm. By adjusting the tension of the aramid flexible straps 3, the radian of the wing is controlled at 10-20° to simulate the aerodynamic shape of a hawk with its wings spread. Use epoxy resin adhesive to reinforce the key nodes to ensure the stability of the radian.

[0043] The bionic skeleton 1 resolves the contradiction between strength and weight. The multi-layer skin achieves the functional integration of tear resistance, elasticity, weather resistance and waterproofness. The aramid straps optimize the connection strength and controllability. The gradient curing process accurately controls the regional performance, making the kite more lightweight, wind-resistant and with a longer service life. The lower breakage rate greatly reduces the replacement frequency, reduces user maintenance costs, and improves environmental protection and economy. The kite can fly stably in a wider range of weather conditions and is suitable for more diverse outdoor environments. It is also easier to fly, which improves the success rate of flying and the user's control experience. The kite can withstand greater tension during flight to ensure a more stable trajectory flight.

[0044] In a breeze environment, wind speed of 1-2: relax the tension of the aramid flexible strap 3, use the flexibility of the wingtip area, and use the thickness of 0.2mm to increase lift, ensuring that the aircraft can take off with a wind speed of 0.3-1.5m / s at level 1. In a strong wind environment, wind speed of 5-6: tighten the aramid flexible strap 3, strengthen the rigidity of the wing root area, and achieve a wind resistance level of level 6. It is prohibited to use the aircraft in winds above level 6, wind speeds > 17.1m / s, or in thunderstorms to avoid safety hazards caused by the conductivity of the skeleton carbon fiber. After testing, the tensile strength of the wing root area after curing reaches 302MPa, and the elongation at break of the wingtip area is 37%.

[0045] The bionic skeleton 1 is made of carbon fiber, which increases the service life of the bionic skeleton 1 and further improves the tensile and wind resistance of the bionic skeleton 1. Moreover, the skeleton made of carbon fiber is light in weight and can take off in a breeze environment. The elastic buffering of the aramid flexible strap 3 makes the wing surface evenly stressed during flight. At the same time, the zoned curing process realizes the improvement of the tensile strength of the wing root area, adapting to high force requirements, and retaining the flexibility of the wingtip area. The radian of the wing surface is controlled at 10-20° through the tension of the strap, simulating the aerodynamic shape of a hawk spreading its wings. The lift is sufficient in a breeze environment and the flight stability is improved.

[0046] When using, stand against the wind, hold the tail of the kite, and make the wing surface at a 30° angle to the wind direction. When the wind is stable, let go and gently pull the traction line. The hydrophobic property of the waterproof layer 208 on the skin can be used to prevent moisture from increasing weight and affecting takeoff. If there is light rain, it can be flown normally.

[0047] Hovering control: By pulling the traction line left and right, the elastic buffer of the aramid flexible strap 3 is used to tilt the wing surface 15-20 degrees left and right to simulate the hovering posture of an eagle. In strong winds, the traction line is tightened to stabilize the altitude using the high tensile strength of the wing root area. In light winds, the traction line is loosened to increase the hovering time using the flexibility of the wingtip area.

[0048] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A bionic hawk kite based on a silk-coated composite membrane, characterized by: The invention comprises a bionic skeleton (1), wherein a bionic skin (2) is provided at the bottom of the bionic skeleton (1), wherein the bionic skeleton (1) and the bionic skin (2) are connected via an aramid flexible binding band (3), wherein the bionic skin (2) is composed of a base layer (201), a first tear-resistant layer (202), a first elastic layer (203), a first weather-resistant layer (204), a second tear-resistant layer (205), a second elastic layer (206), a second weather-resistant layer (207) and a waterproof layer (208), wherein the first tear-resistant layer (202) is provided on the top of the base layer (201).

2. The bionic hawk kite based on the silk-coated composite membrane according to claim 1, characterized in that: The first elastic layer (203) is arranged on the top of the first tear-resistant layer (202), the first weather-resistant layer (204) is arranged on the top of the first elastic layer (203), the second tear-resistant layer (205) is arranged on the bottom of the base layer (201), the second elastic layer (206) is arranged on the bottom of the second tear-resistant layer (205), the second weather-resistant layer (207) is arranged on the bottom of the second elastic layer (206), and the waterproof layer (208) is respectively arranged on the surfaces of the base layer (201), the first tear-resistant layer (202), the first elastic layer (203), the first weather-resistant layer (204), the second tear-resistant layer (205), the second elastic layer (206) and the second weather-resistant layer (207).

3. The bionic hawk kite based on the silk-coated composite membrane according to claim 1 is characterized by: The surface of the bionic skeleton (1) is coated with a nano coating (101), the thickness of the nano coating (101) is 10-50 nm, and the bionic skeleton (1) is made of carbon fiber.

4. The bionic hawk kite based on the silk-coated composite membrane according to claim 2, characterized in that: The base layer (201) is made of a silk-coagulated composite membrane, which is made of a composite of silk protein and polyester fiber, wherein the silk protein and polyester fiber are mixed in a ratio of 40:60% and have a thickness of 0.2-0.5 mm.

5. The bionic hawk kite based on the silk-coated composite membrane according to claim 2, characterized in that: The first tear-resistant layer (202) and the second tear-resistant layer (205) are both made of aramid fiber mesh, and the aramid fiber mesh has a surface density of 15-25 g / m 2 , thickness is 0.08-0.12mm.

6. The bionic hawk kite based on the silk-coated composite membrane according to claim 2, characterized in that: The first elastic layer (203) and the second elastic layer (206) are both made of silica gel microbubble membrane, and the silica gel microbubble membrane is a closed-cell silica gel with a density of 0.2-0.3 g / cm 3 , thickness is 0.1-0.15mm.

7. The bionic hawk kite based on the silk-coated composite membrane according to claim 2, characterized in that: The first weather-resistant layer (204) and the second weather-resistant layer (207) are both made of UV-resistant polyurethane. The UV polyurethane contains 5-8% of nano-TiO2 polyurethane resin, has a particle size of 20-40nm, and a thickness of 0.1-0.12mm.

8. The bionic hawk kite based on the silk-coated composite membrane according to claim 2, characterized in that: The waterproof layer (208) is made by coating SiO2 nanoparticles, wherein the particle size of the SiO2 nanoparticles is 10-30nm and the thickness is 0.05-0.1mm.

9. A gradient curing process for manufacturing a bionic eagle kite based on a silk-coated composite membrane, characterized by: The manufacturing process is applicable to the bionic eagle kite based on the silk-condensed composite membrane according to any one of claims 1 to 8, and specifically includes the following processes: S1. Carbon fiber weaving and shaping: Use T700 grade carbon fiber filaments with a tensile strength of ≥500MPa and a diameter of 7μm. Design a weaving mold based on the topological structure of the wing skeleton of the eagle, making the wing root thick and the wing tip thin. Then, use a high-temperature shaping furnace to shape the filaments at 300℃ for 10-15 minutes, cool them to room temperature, and then remove them to ensure that the initial strength of the skeleton is ≥450MPa. S2. Coating: Prepare a nano-SiO2 suspension containing 5-10% silane coupling agent with a particle size of 10-30 nm, and then use ultrasonic spraying to control the thickness to 10-50 nm to ensure that the coating evenly covers the surface of the bionic skeleton 1, and then dry at room temperature for 2 hours; S3. Skin preparation: Silk protein and polyester fiber are mixed in a weight ratio, deionized water is added and stirred into a uniform sol, and coated by a precision coating machine. The wing root area is coated to a thickness of 0.5 mm by a scraping method, and the wing tip area is coated to a thickness of 0.2 mm. The aramid fiber mesh is cut, the upper tear-resistant layer covers the upper surface of the base layer (201), and the lower tear-resistant layer covers the lower surface of the base layer (201), and is symmetrically arranged with the upper layer, and then bonded by a hot pressing process. The closed-cell silicone microbubble film is cut into the same size as the tear-resistant layer, the upper elastic layer is laid on the upper tear-resistant layer, fixed with a silicone adhesive, and the lower elastic layer is laid under the lower tear-resistant layer. The operation is symmetrical, and then cured at a constant temperature of 60°C for 10 minutes. A polyurethane resin containing 5-8% nano-TiO2 and a solid content of 50% is sprayed on the surface of the upper elastic layer and the lower weather-resistant layer is sprayed on the surface of the lower elastic layer. The film is cured at 100°C and cross-linked for 20 minutes to form a weather-resistant barrier. S4. Waterproof treatment: The bottom layer is coated with fluorocarbon resin with a thickness of 0.03-0.05mm, and the surface layer is sprayed with nano-SiO2 particles with a thickness of 0.02-0.05mm, and then cured and irradiated with ultraviolet light with an energy density of 5-10J / cm 2 , time 5-10min, forming a hydrophobic surface with a contact angle ≥160°; S5. Partitioned gradient curing: Curing is performed in a gradient curing furnace, which can control temperature and pressure in different zones. The wing root area is cured at 120°C, with a pressure of 0.4-0.6 MPa for 25-35 minutes. The wing tip area is cured at 80°C, with a pressure of 0.2-0.4 MPa for 15-25 minutes. The area is then naturally cooled to room temperature to avoid cracking of the skin caused by sudden cooling. S6. Connecting the skeleton and the skin: placing the bionic skeleton 1 on the bionic skin (2), and fixing the skeleton and the skin with aramid flexible straps (3) every 5 cm.

10. The gradient solidification manufacturing process for a bionic eagle kite based on a silk-gel composite membrane according to claim 9, characterized in that: By adjusting the tension of the aramid flexible strap (3), the wing curvature is controlled at 10-20 degrees to simulate the aerodynamic shape of a hawk spreading its wings. Epoxy resin adhesive is used to reinforce the key nodes to ensure the stability of the curvature.

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