A device for quick switching between folding propellers and rigid straight propellers, and variable blades.

Abstract

This utility model provides a quick switching device for folding propellers and rigid straight propellers, as well as variable blades, belonging to the field of UAV accessories. The quick switching device includes a rigid support sleeve and a limiting guide structure. The limiting guide structure is fixedly installed to the blade clamp, and the rigid support sleeve is slidably installed to the limiting guide structure. The rigid support sleeve can slidably approach and tighten at least two propeller blades, restricting the swing or rotation of the propeller blades relative to the rigid support sleeve. Through the cooperation of the rigid support sleeve and the limiting guide structure, the flexible switching of the propeller working mode is realized. When the support sleeve is locked, it provides circumferential constraint, forming a high-strength rigid straight propeller, improving flight stability and efficiency. After the support sleeve is removed, the propeller blades can swing and fold freely, making them easy to store and adapting to airflow changes. This effectively solves the problem of balancing portability and stability, significantly enhancing the comprehensive performance of UAVs in different scenarios.

Description

Technical Field

[0001] This utility model belongs to the field of drone accessories, and particularly relates to a quick switching device for folding propellers and rigid straight propellers, as well as a variable propeller blade using the above-mentioned switching device. Background Technology

[0002] As an important type of aircraft, drones are widely used in both civilian and military fields. One of the core components of their flight performance is the propeller, which is mainly divided into two types: integrated rigid propellers and foldable propellers connected by blade clamps. Rigid propellers are typically manufactured using composite materials (such as carbon fiber) through a hot-pressing process. They have high structural strength, good aerodynamic efficiency, and are not easily deformed during high-speed rotation, providing stable lift. However, due to their integrated molding characteristics, rigid propellers are prone to vibration when facing complex or abrupt airflow, affecting flight stability. They also present inconveniences in terms of storage and transportation. Foldable propellers are folded using hinge mechanisms or blade clamps, significantly improving portability and storage efficiency. Their blades can swing independently on both sides, allowing for adaptive deformation based on different airflow conditions, which helps improve aerodynamic efficiency and avoid vibration during flight. However, the folding design also results in lower overall structural strength compared to rigid propellers, posing a risk of insufficient reliability. Summary of the Invention

[0003] Based on the aforementioned problems in the existing technology, this utility model provides a quick switching device for folding propellers and rigid straight propellers, which includes a rigid support sleeve and a limiting guide structure. The limiting guide structure is fixedly installed to the blade clamp, and the rigid support sleeve is slidably installed to the limiting guide structure. The rigid support sleeve can slidably approach and tighten at least two propeller blades and restrict the swing or rotation of the propeller blades relative to the rigid support sleeve.

[0004] The rigid support sleeve includes a base plate, and both sides of the base plate are provided with limiting side plates for contact and limiting engagement with the blades. The base plate is also fixedly mounted with a guide cylinder. The limiting and guiding structure includes a guide post fixedly mounted to the blade clamp. The guide post and the guide cylinder are coaxially slidably engaged. The end of the guide post away from the blade clamp is provided with an anti-detachment part protruding towards the guide cylinder. The guide cylinder is provided with an anti-detachment ring protruding towards the guide post and engaging with the anti-detachment part. The engagement of the anti-detachment part and the anti-detachment ring restricts the guide cylinder from detaching from the guide post.

[0005] The guide cylinder is also equipped with a reset spring. One end of the reset spring is in contact with the guide part, and the other end of the reset spring is in contact with the anti-detachment ring. The reset spring resists the rigid support sleeve from sliding away from the blade clamp.

[0006] The limiting side plate is provided with a raised reinforcing part on the outer or inner side of the corresponding propeller blade, or both the outer and inner sides.

[0007] The limiting side plate has a limiting groove in the middle that is adapted to the width of the blade clamp for engaging.

[0008] This invention also provides a variable blade, which is equipped with a quick switching device for folding blades and rigid straight blades as described above.

[0009] The variable blade includes a blade clamp, with a blade mounted rotatably at each end of the blade clamp. The limiting guide structure is fixedly installed on the top of the blade clamp. The rigid support sleeve is slidably installed onto the limiting guide structure. When the rigid support sleeve is pressed against the blade clamp, its two ends are respectively fitted with the corresponding blades and the blades are restricted from rotating relative to the blade clamp.

[0010] The beneficial effects of this invention are as follows: Through the coordinated operation of the rigid support sleeve and the limiting guide structure, the flexible switching of the UAV propeller's working mode is effectively realized. When the rigid support sleeve slides along the limiting guide structure and tightens around the propeller blade, it provides sufficient circumferential constraint to the blade, enhancing its structural rigidity and enabling it to be used as a rigid straight propeller, thus improving power efficiency. When the rigid support sleeve is removed, the propeller blade can resume free swinging, switching to a folding propeller mode, greatly facilitating storage and transportation, and enabling adaptive adjustment to complex airflow environments. This device successfully solves the inherent contradiction between portability and stability in a single type of propeller, significantly improving the adaptability and overall performance of UAVs in different application scenarios. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of a device for quickly switching between a folding propeller and a rigid straight propeller.

[0012] Figure 2 This is a cross-sectional structural schematic diagram of a device for quickly switching between a folding propeller and a rigid straight propeller.

[0013] Figure 3 This is a cross-sectional structural diagram of a quick switching device between a folding propeller and a rigid straight propeller, which is coupled with a propeller clamp.

[0014] Figure 4 This is a schematic diagram of a three-dimensional structure of a variable blade, in the form of a rigid straight blade.

[0015] Figure 5 yes Figure 4 Enlarged view of point A.

[0016] Figure 6 This is a schematic diagram of a three-dimensional structure of a variable blade, showing the blade in a folded state.

[0017] Figure 7 yes Figure 6 Enlarged view of point B. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0019] Example 1: A device for quickly switching between folding propellers and rigid straight propellers.

[0020] As attached Figure 1-3 The device shown is a quick switching device for folding propellers and rigid straight propellers, comprising a rigid support sleeve 1 and a limiting guide structure 2. The rigid support sleeve 1 includes a horizontally arranged base plate 3. Both sides of the lower surface of the base plate 3 are provided with downwardly extending limiting side plates 4 for contacting and limiting the propeller blades 13. The limiting side plates 4 are provided with raised reinforcing parts 5 on the outer and inner sides corresponding to the propeller blades 13. The raised reinforcing parts 5 can improve the structural strength and load-bearing capacity of the limiting side plates 4. The middle of the limiting side plates 4 is provided with a width adapted to the blade clamp 12. The limiting groove 6 is trapezoidal in shape, wider at the bottom and narrower at the top, which facilitates the rigid support sleeve 1 to snap onto the blade clamp 12 and forms a mutually constraining limiting structure with the blade clamp 12, preventing the rigid support sleeve 1 from rotating arbitrarily. A guide cylinder 7 is fixedly installed in the middle of the upper surface of the base plate 3, and a circular hole is provided in the base plate 3 at the axis corresponding to the guide cylinder 7. The limiting guide structure 2 is a bolt. After passing through the circular hole on the base plate 3, the limiting guide structure 2 is fixedly installed to the blade clamp 12 by threaded connection. The limiting guide structure 2 is located in the guide cylinder. Inside 7, the head of the bolt protrudes radially towards the guide cylinder 7 to form an anti-detachment part 8. The bolt shank forms a guide post 9. The end of the guide post 9 is fixedly installed to the blade clamp 12 so that the anti-detachment part 8 can be moved away from the blade clamp 12. The diameter of the anti-detachment part 8 is adapted to the inner diameter of the guide cylinder 7 so that the anti-detachment part 8 and the inner wall of the guide cylinder 7 are in clearance fit. The guide cylinder 7 and the limiting guide structure 2 can slide relatively coaxially, that is, the rigid support sleeve 1 is slidably installed on the limiting guide structure 2. The end of the guide cylinder 7 near the blade clamp 12 is provided with a protrusion towards the guide post 9 and an anti-detachment part 8. The anti-detachment ring 10 is engaged with the detachment part 8. The engagement of the anti-detachment part 8 and the anti-detachment ring 10 restricts the guide cylinder 7 from detaching from the guide post 9. A return spring 11 is also provided inside the guide cylinder 7. One end of the return spring 11 is connected to the guide part, and the other end of the return spring 11 is connected to the anti-detachment ring 10. The return spring 11 resists the rigid support sleeve 1 from sliding away from the blade clamp 12. The rigid support sleeve 1 can slide close to and tighten the two blades 13 and restrict the swing or rotation of the blades 13 relative to the rigid support sleeve 1, thereby switching the folding propeller into a rigid straight propeller.

[0021] Example 2: A variable blade.

[0022] As attached Figure 1-7The variable blade shown is equipped with a quick switching device for folding blades and rigid straight blades as described in Embodiment 1. Specifically, it includes a blade clamp 12, with a blade 13 mounted on each end of the blade clamp 12 via a rotating shaft. A nut groove 14 is provided at the center of the top of the blade clamp 12, and a hexagonal nut is provided in the nut groove 14. The limiting guide structure 2 is fixedly installed to the blade clamp 12 by cooperating with the hexagonal nut. The rigid support sleeve 1 is slidably installed on the limiting guide structure 2. When the rigid support sleeve 1 is close to the blade clamp 12, its two ends are respectively fitted with the corresponding blades 13 and restrict the rotation of the blades 13 relative to the blade clamp 12.

[0023] The variable blades provided by this invention can switch between rigid straight blades and folding blades as needed, such as... Figure 4 and 5 As shown, when the rigid support sleeve 1 is tightly fitted onto the two propeller blades 13, the rigid support sleeve 1 provides sufficient constraint force to maintain the two propeller blades 13 in a rigid straight propeller shape. When it is necessary to switch to a folding propeller, as... Figure 6 and 7 As shown, when the rigid support sleeve 1 is pulled up, the rigid support sleeve 1 compresses the return spring 11. Then, the rigid support sleeve 1 is rotated 90° and released. At this time, under the action of the return spring 11, the rigid support sleeve 1 is pressed back into the blade clamp 12, but the blade 13 is not tightly clamped. At this time, the blade 13 can rotate relative to the blade clamp 12, becoming a folding blade.

[0024] The above-described embodiments only illustrate two implementation methods of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A device for quickly switching between a folding propeller and a rigid straight propeller, characterized in that, It includes a rigid support sleeve (1) and a limiting guide structure (2), the limiting guide structure (2) being fixedly installed to the blade clamp (12), the rigid support sleeve (1) being slidably installed to the limiting guide structure (2), the rigid support sleeve (1) being slidably close to and tightly clamping at least two blades (13) and restricting the swing or rotation of the blades (13) relative to the rigid support sleeve (1).

2. The rapid switching device between a folding propeller and a rigid straight propeller according to claim 1, characterized in that, The rigid support sleeve (1) includes a base plate (3). Both sides of the base plate (3) are provided with limiting side plates (4) for contacting and limiting the blade (13). The base plate (3) is also fixedly installed with a guide cylinder (7). The limiting guide structure (2) includes a guide post (9) fixedly installed to the blade clamp (12). The guide post (9) and the guide cylinder (7) are coaxially slidably engaged. One end of the guide post (9) away from the blade clamp (12) is provided with an anti-detachment part (8) protruding towards the guide cylinder (7). The guide cylinder (7) is provided with an anti-detachment ring (10) protruding towards the guide post (9) and contacting and engaging with the anti-detachment part (8). The engagement of the anti-detachment part (8) and the anti-detachment ring (10) restricts the guide cylinder (7) from detaching from the guide post (9).

3. The rapid switching device between a folding propeller and a rigid straight propeller according to claim 2, characterized in that, The guide cylinder (7) is also provided with a reset spring (11). One end of the reset spring (11) is in contact with the guide part, and the other end of the reset spring (11) is in contact with the anti-detachment ring (10). The reset spring (11) resists the rigid support sleeve (1) from sliding away from the blade clamp (12).

4. A quick switching device for folding propellers and rigid straight propellers according to claim 2 or 3, characterized in that, The limiting side plate (4) is provided with a raised reinforcing part (5) on the outer or inner side of the corresponding blade (13), or on both the outer and inner sides.

5. A rapid switching device for folding propellers and rigid straight propellers according to claim 2 or 3, characterized in that, The middle part of the limiting side plate (4) is provided with a limiting groove (6) that is adapted to the width of the blade clamp (12) and engages with it.

6. A variable blade, characterized in that, It is equipped with a quick switching device for folding propellers and rigid straight propellers as described in any one of claims 1-5.

7. A variable blade according to claim 6, characterized in that, It includes a blade clamp (12), with a blade (13) rotatably mounted at each end of the blade clamp (12), and the limiting guide structure (2) is fixedly mounted on the top of the blade clamp (12). The rigid support sleeve (1) is slidably mounted to the limiting guide structure (2). When the rigid support sleeve (1) is close to the blade clamp (12), the corresponding blades (13) are respectively fitted at both ends and the blades (13) are restricted from rotating relative to the blade clamp (12).

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