Lightweight unmanned aerial vehicle rotor paddle

Abstract

The utility model belongs to the technical field of unmanned aerial vehicles and discloses a lightweight unmanned aerial vehicle rotor paddle which comprises a paddle core layer and carbon fiber reinforcement layer groups, the upper surface and the lower surface of the paddle core layer are respectively and symmetrically coated with the carbon fiber reinforcement layer groups, and the paddle core layer and the carbon fiber reinforcement layer groups are formed by pressing and curing through an integral forming process. The pulp core layer is filled with a foaming epoxy core material, the carbon fiber reinforcement layer group comprises T700 one-way carbon fiber prepreg layers and T300 twill fabric prepreg layers, the upper surface and the lower surface of the pulp core layer are respectively provided with two overlapped T700 one-way carbon fiber prepreg layers, and the T300 twill fabric prepreg layers are arranged on the T700 one-way carbon fiber prepreg layers. And each T700 unidirectional carbon fiber prepreg layer positioned on the outer side is provided with a T300 twill fabric prepreg layer. The foaming epoxy core material is used as the pulp core layer filled inside, and the T700 one-way carbon fiber prepreg layer and the T300 twill fabric prepreg layer are used as the outer side, so that the composite material has the advantages of being even in material filling, lighter in specific gravity, better in strength, good in weather resistance, lower in cost and high in efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of unmanned aerial vehicles, and relates to a lightweight unmanned aerial vehicle rotor blade. Background Art

[0002] An unmanned aerial vehicle, abbreviated as UAV, is a new concept weapon and equipment in rapid development, which has the advantages of being flexible, responsive, unmanned, and having low operation requirements. At present, the application scope of UAVs has been expanded to three major fields: military, scientific research, and civilian. Specifically, they are widely used in fields such as electric power, communication, meteorology, agriculture, ocean, exploration, photography, disaster prevention and mitigation, crop yield estimation, drug suppression and smuggling, border patrol, public security, and anti-terrorism. Due to the characteristics of UAVs, the materials used to make UAVs are required to have high strength and low weight. Therefore, carbon fiber materials are used in many UAVs.

[0003] The structure of the existing carbon fiber rotor blade uses carbon fiber on the outside, and the internal filling material is mostly wood material / polyurethane material. When the internal filling material is wood material, due to the unevenness inside the wood material, the filling is inconsistent. After covering the carbon fiber, the rotor blade needs to be adjusted for dynamic balance, and its manufacturing process is complex and costly. Moreover, due to the relatively large specific gravity of this material, the processing and production efficiency of the carbon fiber rotor blade is reduced. When using polyurethane material, there will be a problem of insufficient strength.

[0004] Therefore, it is urgent to improve the technology of the existing carbon fiber rotor blade to overcome the shortcomings of the carbon fiber rotor blade in the prior art and provide a lightweight unmanned aerial vehicle rotor blade. Summary of the Utility Model

[0005] The utility model provides a lightweight unmanned aerial vehicle rotor blade, aiming to solve the problems that the structure of the existing carbon fiber rotor blade uses carbon fiber on the outside, and the internal filling material is mostly wood material / polyurethane material, resulting in high cost, low working efficiency, and low strength of the carbon fiber rotor blade after covering the carbon fiber and requiring dynamic balance adjustment.

[0006] To achieve the above object, the utility model provides a lightweight unmanned aerial vehicle rotor blade. The unmanned aerial vehicle rotor blade includes a core layer and a carbon fiber reinforcement layer group. The upper and lower surfaces of the core layer are symmetrically coated with the carbon fiber reinforcement layer group respectively, and the core layer and the carbon fiber reinforcement layer group are pressed and cured by an integral molding process. The core layer is filled with a foamed epoxy core material. The carbon fiber reinforcement layer group includes a T700 unidirectional carbon fiber prepreg layer and a T300 twill fabric prepreg layer. Two layers of T700 unidirectional carbon fiber prepreg layers are stacked on the upper and lower surfaces of the core layer respectively, and a T300 twill fabric prepreg layer is provided on each of the T700 unidirectional carbon fiber prepreg layers located on the outside to form a lightweight unmanned aerial vehicle rotor blade.

[0007] Preferably, the drone rotor blade includes a planar mounting portion in the middle and obliquely twisted blades integrally connected to the left and right ends of the planar mounting portion. A positioning hole is provided at the center of the planar mounting portion, and identical screw holes are provided on both sides of the positioning hole. Chamfered edges for deburring are provided on the entire contour of the drone rotor blade.

[0008] Advantages of the present utility model over the prior art:

[0009] The present utility model provides a lightweight drone rotor blade, which uses a foamed epoxy core material as the internal filling core layer, and T700 unidirectional carbon fiber prepreg layer and T300 twill fabric prepreg layer on the outside. It has the advantages of uniform material filling, lighter specific gravity, better strength, good weather resistance, lower cost, and high efficiency.

[0010] To more clearly elaborate on the structural features and functions of the present utility model, the following will combine the drawings with specific embodiments to detail the present utility model. Description of the Drawings

[0011] Figure 1 It is a top view structural schematic diagram of the present utility model;

[0012] Figure 2 It is a cross-sectional structural schematic diagram of the core layer and carbon fiber reinforced layer group of the present utility model;

[0013] Figure 3 It is a cross-sectional exploded structural schematic diagram of the layered drone rotor blade of the present utility model;

[0014] Figure 4 It is a structural schematic diagram of the mold used in the present utility model;

[0015] Reference Numerals:

[0016] 1. Core layer; 2. Carbon fiber reinforced layer group; 3. Planar mounting portion; 4. Obliquely twisted blade; 5. Positioning hole; 6. Screw hole; 7. Chamfered edge. Detailed Embodiments

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and are not used to describe a specific order.

[0018] As used herein, the term "embodiment" means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears at various positions in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0019] To achieve the above object, an embodiment of the present utility model provides a lightweight unmanned aerial vehicle rotor blade. Referring to Figures 1-4 as shown, the unmanned aerial vehicle rotor blade includes a core layer 1 and a carbon fiber reinforced layer group 2. The upper and lower surfaces of the core layer 1 are symmetrically coated with the carbon fiber reinforced layer group 2 respectively, and the core layer 1 and the carbon fiber reinforced layer group 2 are formed by integral molding and curing process. The core layer 1 is filled with a foamed epoxy core material. The carbon fiber reinforced layer group 2 includes a T700 unidirectional carbon fiber prepreg layer and a T300 twill fabric prepreg layer. Two layers of T700 unidirectional carbon fiber prepreg layers are respectively provided on the upper and lower surfaces of the core layer 1, and a T300 twill fabric prepreg layer is provided on each of the outermost T700 unidirectional carbon fiber prepreg layers to form a lightweight unmanned aerial vehicle rotor blade.

[0020] Among them, the unmanned aerial vehicle rotor blade includes a planar mounting portion 3 in the middle and skew-twisted blade pieces 4 integrally connected to the left and right ends of the planar mounting portion 3. A positioning hole 5 is provided at the center of the planar mounting portion 3, and identical screw holes 6 are provided on both sides of the positioning hole 5. The entire contour edge of the unmanned aerial vehicle rotor blade is provided with a deburred rounded corner 7.

[0021] In this embodiment, as Figures 3-4 shown, the manufacturing of the unmanned aerial vehicle rotor blade is as follows:

[0022] Mold manufacturing: Referring to the three-dimensional model of the carbon fiber rotor blade, two sets of molds are respectively designed and processed, one is the mold for the core layer 1, and the other is the product mold for the unmanned aerial vehicle rotor blade. Among them, compared with the mold for the core layer 1, the product mold retains the space coated with the carbon fiber reinforced layer group 2, that is, after the core layer 1 is formed, the carbon fiber reinforced layer group 2 is coated and then put into the product mold for forming and curing.

[0023] Forming of the core layer 1: Put an appropriate amount of foamed epoxy core material into the mold for the core layer 1, close the mold and put it into a molding press. The pressure is set to 1.5 - 3 MPa, the temperature is set to 120 - 150 °C, keep the temperature and pressure for 20 - 40 min, and take out the core layer 1 after cooling to 45 °C, and trim the burrs on the edge;

[0024] Coating of the carbon fiber reinforced layer group 2: The carbon fiber reinforced layer group 2 is coated on the upper and lower surfaces of the trimmed pulp core layer 1 respectively. The T700 unidirectional carbon fiber prepreg layer, the T700 unidirectional carbon fiber prepreg layer and the T300 twill fabric prepreg layer are laid outwards in sequence, with a total of three layers respectively, to form a rough blank;

[0025] Molding and curing: The coated rough blank is placed into the product mold. As Figure 3 shown, after closing the mold, it is placed into a molding press. The pressure is set to 2 - 3 MPa, the temperature is set to 130 - 160 °C, and it is kept warm and under pressure for 30 - 60 min. After curing and molding, it is cooled to room temperature, and the unmanned aerial vehicle rotor blade product is taken out and the burrs are removed by grinding, then the lightweight unmanned aerial vehicle rotor blade can be obtained.

[0026] The unmanned aerial vehicle rotor blade has the following advantages:

[0027] Lightweight: Compared with the traditional composite materials such as foamed polyurethane, balsa wood, and wood substitute, the present embodiment uses the foamed epoxy core material with better uniformity as the filled pulp core layer 1, which has a low material specific gravity and makes the weight of the pulp core layer 1 lighter;

[0028] Mechanical properties: On the upper and lower surfaces of the lighter pulp core layer 1, the 2 - layer T700 unidirectional carbon fiber prepreg layer and the 1 - layer T300 twill fabric prepreg layer are respectively coated, which makes the strength of the skew - twisted blade 4 improved to a high level. Compared with the traditional unmanned aerial vehicle rotor blade, the present embodiment has a lighter weight and better strength.

[0029] Industrial efficiency: Two sets of molds are used. First, the pulp core layer 1 is pressed by the first set of molds, then the carbon fiber reinforced layer rough material is coated, and the whole unmanned aerial vehicle rotor blade is made by the second set of molds. It is formed by one - piece molding process and pressed and cured, with high production efficiency, low cost, and is also suitable for mass industrial production.

[0030] In summary, the present utility model provides a lightweight unmanned aerial vehicle rotor blade, with the foamed epoxy core material as the internally filled pulp core layer 1, and the T700 unidirectional carbon fiber prepreg layer and the T300 twill fabric prepreg layer as the outer sides, having the advantages of uniform material filling, lighter specific gravity, better strength, good weather resistance, lower cost, and high efficiency.

[0031] The above describes the technical principle of the present utility model in combination with specific embodiments, which is only the preferred embodiment of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. All technical solutions within the idea of the present utility model belong to the protection scope of the present utility model. Those skilled in the art can think of other specific embodiments of the present utility model without creative labor and will fall within the protection scope of the present utility model.

Claims

1. A lightweight drone rotor blade, characterized in that, The drone rotor blade includes a core layer and a carbon fiber reinforced layer group. The upper and lower surfaces of the core layer are symmetrically coated with the carbon fiber reinforced layer group respectively, and the core layer and the carbon fiber reinforced layer group are pressed and cured by an integral molding process. The core layer is filled with a foamed epoxy core material. The carbon fiber reinforced layer group includes a T700 unidirectional carbon fiber prepreg layer and a T300 twill fabric prepreg layer. Two layers of T700 unidirectional carbon fiber prepreg layers are respectively arranged on the upper and lower surfaces of the core layer in an overlapping manner, and a T300 twill fabric prepreg layer is arranged on each of the outermost T700 unidirectional carbon fiber prepreg layers, so as to form a lightweight drone rotor blade.

2. The lightweight unmanned aerial vehicle rotor blade according to claim 1, wherein, The drone rotor blade includes a planar mounting part in the middle and skew-twisted blades integrally connected to the left and right ends of the planar mounting part. A positioning hole is provided at the center of the planar mounting part, and identical screw holes are provided on both sides of the positioning hole. Chamfered edges are provided on the entire contour of the drone rotor blade to remove burrs.

Images