A durable propeller blade for drones

Abstract

This utility model relates to the field of drone propeller technology, and more particularly to a durable drone propeller blade. This utility model uses a polymethyl methacrylate foam buffer layer as a sandwich structure in the middle of the aramid fiber protective layer. When the aramid fiber protective layer at the front and rear edges of the drone propeller blade is impacted, the aramid fiber protective layer itself absorbs the impact force initially. Then, the polymethyl methacrylate foam buffer layer in the middle of the aramid fiber protective layer absorbs the impact force again, thus absorbing more impact energy. This improves the impact resistance of the drone propeller blade body and effectively prevents the front and rear edges of the drone propeller blade from colliding with external objects, causing mutual compression between the internal structure of the drone propeller blade body and the front and rear edge structures, thereby avoiding damage and cracking of the front and rear edges of the drone propeller blade.

Description

Technical Field

[0001] This utility model relates to the field of drone propeller technology, and in particular to a durable drone propeller blade. Background Technology

[0002] Carbon fiber reinforced composites are widely used in the manufacture of drone propellers due to their superior specific strength, specific modulus, corrosion resistance, and excellent fatigue resistance. However, this material has inherent limitations in resisting sharp impacts and low-energy impacts, a weakness that becomes particularly pronounced when the leading and trailing edges of drone propellers collide with external objects. During propeller installation and high-speed rotation, the leading and trailing edges inevitably collide with external objects, causing hard compression between the leading and trailing edges and the main structure, leading to damage and cracking of the leading and trailing edges. This damage not only significantly reduces the aerodynamic performance of the propeller and shortens its service life, but may even cause the drone to lose balance and crash, resulting in serious safety accidents and economic losses.

[0003] Given that the leading and trailing edges of UAV propellers in existing technologies are prone to breakage and cracking under collision conditions, and have poor impact resistance, we propose a durable UAV propeller blade to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of the prior art by proposing a durable propeller blade for unmanned aerial vehicles.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a durable propeller blade for unmanned aerial vehicles, comprising an aramid fiber protective layer, a polymethyl methacrylate foam buffer layer, an inner groove, a carbon fiber and glass fiber mixed layup plate, a first hole, a carbon fiber skin, and a second hole. The polymethyl methacrylate foam buffer layer is bonded to the middle of the aramid fiber protective layer and cured. The inner groove is provided through the middle of the polymethyl methacrylate foam buffer layer. The carbon fiber and glass fiber mixed layup plate is movably installed inside the inner groove. Multiple first holes are provided through the surface of the glass fiber mixed layup plate. The carbon fiber skin is bonded to both the top and bottom of the aramid fiber protective layer and cured. Multiple second holes are provided through the middle of the carbon fiber skin.

[0006] Preferably, the polymethacrylamide foam buffer layer is adapted to the inner center of the aramid fiber protective layer, and the polymethacrylamide foam buffer layer and the aramid fiber protective layer have a sandwich structure.

[0007] Preferably, the two carbon fiber skins are arranged in a symmetrical structure, and both carbon fiber skins are adapted to the aramid fiber protective layer vertically. Furthermore, the two carbon fiber skins, the polymethyl methacrylate foam buffer layer, and the aramid fiber protective layer are all sandwich structures.

[0008] Preferably, the carbon fiber and glass fiber hybrid laminate has an inlaid structure inside the inner groove, and the first hole and the second hole are vertically aligned.

[0009] Compared with the prior art, this utility model has the following advantages:

[0010] (1) By using the polymethyl methacrylate foam buffer layer as the sandwich structure in the middle of the aramid fiber protective layer, when the aramid fiber protective layer of the front and rear edge structure of the UAV propeller blade is hit, the impact force can be absorbed for the first time by the impact resistance of the aramid fiber protective layer itself. Then, the polymethyl methacrylate foam buffer layer in the middle of the aramid fiber protective layer can absorb the impact force again, which can absorb more impact energy, thereby improving the impact resistance of the UAV propeller blade body and effectively preventing the front and rear edges of the UAV propeller blade from hitting the external objects, causing mutual compression between the internal structure of the UAV propeller blade body and the front and rear edge structure, thereby avoiding damage and cracking of the front and rear edges of the UAV propeller blade.

[0011] (2) The polymethyl methacrylate foam buffer layer and the aramid fiber protective layer are wrapped by two carbon fiber skins to form a three-layer sandwich structure. The carbon fiber skin can further protect the polymethyl methacrylate foam buffer layer and the aramid fiber protective layer, thereby further improving the impact resistance of the UAV propeller blade. Furthermore, the lightweight nature of the carbon fiber skin, polymethyl methacrylate foam buffer layer and aramid fiber protective layer can reduce the overall weight of the UAV propeller blade. Attached Figure Description

[0012] Figure 1 This is a front view of the entire utility model;

[0013] Figure 2 This is a schematic diagram of the overall disassembled structure of this utility model;

[0014] Figure 3 This is a cross-sectional view of the overall structure of this utility model.

[0015] In the diagram: 1. Aramid fiber protective layer; 2. Polymethyl methacrylate foam buffer layer; 3. Inner groove; 4. Carbon fiber and glass fiber mixed layup; 5. First hole; 6. Carbon fiber skin; 7. Second hole. Detailed Implementation

[0016] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0017] like Figure 1-3 The image shows a durable drone propeller blade, comprising an aramid fiber protective layer 1, a polymethyl methacrylate foam buffer layer 2, an inner groove 3, a carbon fiber and glass fiber hybrid layup 4, first holes 5, a carbon fiber skin 6, and second holes 7. The polymethyl methacrylate foam buffer layer 2 is bonded to the middle of the aramid fiber protective layer 1 and cured. The inner groove 3 is provided through the middle of the polymethyl methacrylate foam buffer layer 2. The carbon fiber and glass fiber hybrid layup 4 is movably installed inside the inner groove 3. Multiple first holes 5 are provided through the surface of the glass fiber hybrid layup 4. The carbon fiber skin 6 is bonded to both the top and bottom of the aramid fiber protective layer 1 and cured. Multiple second holes 7 are provided through the middle of the carbon fiber skin 6.

[0018] In this embodiment, the polymethacrylamide foam buffer layer 2 is adapted to the middle part of the aramid fiber protective layer 1, and the polymethacrylamide foam buffer layer 2 and the aramid fiber protective layer 1 have a sandwich structure.

[0019] In practical application, by using the polymethyl methacrylate foam buffer layer 2 as the sandwich structure in the middle of the aramid fiber protective layer 1, when the aramid fiber protective layer 1 at the front and rear edges of the UAV propeller blade is impacted, the aramid fiber protective layer 1 itself can absorb the impact force initially through its own impact resistance. Then, the polymethyl methacrylate foam buffer layer 2 in the middle of the aramid fiber protective layer 1 can absorb the impact force again, thus absorbing more impact energy. This can improve the impact resistance of the UAV propeller blade body and effectively prevent the front and rear edges of the UAV propeller blade from colliding with external objects, causing mutual compression between the internal structure of the UAV propeller blade body and the front and rear edge structures, thereby avoiding damage and cracking of the front and rear edges of the UAV propeller blade.

[0020] In this embodiment, the two carbon fiber skins 6 are arranged in a symmetrical structure, and both carbon fiber skins 6 are adapted to the aramid fiber protective layer 1 in a corresponding manner. The two carbon fiber skins 6, the polymethyl methacrylate foam buffer layer 2, and the aramid fiber protective layer 1 are all sandwich structures.

[0021] In practical use, the polymethyl methacrylate foam buffer layer 2 and the aramid fiber protective layer 1 are wrapped together by two carbon fiber skins 6 to form a three-layer sandwich structure. The carbon fiber skins 6 further protect the polymethyl methacrylate foam buffer layer 2 and the aramid fiber protective layer 1, thereby improving the impact resistance of the UAV propeller blades. Furthermore, the lightweight nature of the carbon fiber skins 6, the polymethyl methacrylate foam buffer layer 2, and the aramid fiber protective layer 1 reduces the overall weight of the UAV propeller blades.

[0022] In this embodiment, the carbon fiber and glass fiber mixed lay-up plate 4 and the inner groove 3 have an inlaid structure, and the first hole 5 and the second hole 7 are vertically aligned.

[0023] In practical use, the carbon fiber and glass fiber mixed lay-up plate 4 is inlaid and installed inside the inner groove 3, and the first hole 5 and the second hole 7 are aligned vertically. Thus, the threaded blade can be connected and fixed to the propeller clamp through the first hole 5 and the second hole 7. The carbon fiber and glass fiber mixed lay-up plate 4 can also play a reinforcing role when fixed to the propeller clamp.

[0024] The working principle of a durable drone propeller blade mentioned in this utility model:

[0025] In use, by using the polymethyl methacrylate foam buffer layer 2 as the sandwich structure in the middle of the aramid fiber protective layer 1, when the aramid fiber protective layer 1 of the front and rear edge structure of the UAV propeller blade is bumped, the aramid fiber protective layer 1 itself can absorb the impact force initially through its own impact resistance. Then, the polymethyl methacrylate foam buffer layer 2 in the middle of the aramid fiber protective layer 1 can absorb the impact force again, which can absorb more impact energy. This can improve the impact resistance of the UAV propeller blade body and effectively prevent the front and rear edges of the UAV propeller blade from colliding with external objects, causing mutual compression between the internal structure of the UAV propeller blade body and the front and rear edge structure, thereby avoiding damage and cracking of the front and rear edges of the UAV propeller blade.

[0026] Meanwhile, the polymethyl methacrylate foam buffer layer 2 and the aramid fiber protective layer 1 are wrapped by two carbon fiber skins 6 to form a three-layer sandwich structure. The carbon fiber skins 6 can further protect the polymethyl methacrylate foam buffer layer 2 and the aramid fiber protective layer 1, thereby further improving the impact resistance of the UAV propeller blades. Moreover, due to the lightweight nature of the carbon fiber skins 6, the polymethyl methacrylate foam buffer layer 2 and the aramid fiber protective layer 1, the overall weight of the UAV propeller blades can be reduced.

[0027] Meanwhile, by embedding the carbon fiber and glass fiber hybrid laminate 4 into the inner groove 3, and with the first hole 5 and the second hole 7 corresponding vertically, the threaded blade can be connected and fixed to the propeller clamp through the first hole 5 and the second hole 7. The carbon fiber and glass fiber hybrid laminate 4 can also play a reinforcing role when fixed to the propeller clamp.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A durable propeller blade for unmanned aerial vehicles, comprising an aramid fiber protective layer (1), a polymethyl methacrylate foam buffer layer (2), an inner groove (3), a carbon fiber and glass fiber mixed layup (4), a first hole (5), a carbon fiber skin (6), and a second hole (7), characterized in that; The aramid fiber protective layer (1) is bonded with a polymethyl methacrylate foam buffer layer (2) in the middle and cured. The polymethyl methacrylate foam buffer layer (2) has an inner groove (3) through the middle. A carbon fiber and glass fiber mixed layup plate (4) is movably installed inside the inner groove (3). Multiple first holes (5) are through the surface of the glass fiber mixed layup plate (4). The aramid fiber protective layer (1) is bonded with carbon fiber skin (6) on both the top and bottom and cured. Multiple second holes (7) are through the middle of the carbon fiber skin (6).

2. The durable propeller blade for a drone according to claim 1, characterized in that: The polymethyl methacrylate foam buffer layer (2) is adapted to the middle part of the aramid fiber protective layer (1), and the polymethyl methacrylate foam buffer layer (2) and the aramid fiber protective layer (1) are sandwich structures.

3. The durable propeller blade for a drone according to claim 1, characterized in that: The two carbon fiber skins (6) are arranged in a symmetrical structure, and the two carbon fiber skins (6) are adapted to the aramid fiber protective layer (1) in a corresponding manner. The two carbon fiber skins (6) are sandwiched between the polymethyl methacrylate foam buffer layer (2) and the aramid fiber protective layer (1).

4. The durable propeller blade for a drone according to claim 1, characterized in that: The carbon fiber and glass fiber mixed lay-up plate (4) and the inner groove (3) are embedded in each other, and the first hole (5) and the second hole (7) are vertically aligned.

Images