variable pitch propeller

Abstract

The utility model belongs to aerospace equipment technical field, concretely relates to a variable pitch propeller. The utility model discloses variable pitch propeller includes a plurality of blades, hub assembly and a plurality of locating plate, and the blade includes blade main part and locating protruding, and locating protruding sets up at the root of blade main part, and hub assembly includes detachably connected first hub and second hub, and first hub includes first hub main part and a plurality of first connecting part, and second hub includes second hub main part and a plurality of second connecting part, and first connecting part and the second connecting part of direct setting form the slot, and the slot is used for and the root of blade main part inserts, and first hub main part and second hub main part splice and form a plurality of open slot, and open slot and the slot correspond and communicate with the slot, and locating plate inserts in open slot, and locating plate is provided with locating insertion hole, and locating insertion hole is used for and locating protruding inserts. The variable pitch propeller in this technical scheme can realize quick variable pitch and improve variable pitch accuracy.

Description

Technical Field

[0001] This utility model belongs to the field of aerospace equipment technology, and specifically relates to a variable pitch propeller. Background Technology

[0002] To enable propellers to adapt to varying flight altitudes and incoming flow velocities, variable-pitch propeller designs are widely used in modern aerospace engineering. By adjusting the propeller's installation angle, its aerodynamic efficiency and propulsive performance under diverse operating conditions can be significantly improved, thereby enhancing the propeller's versatility and the overall adaptability of the aircraft. Depending on whether they rely on an external power source, variable-pitch propellers can be categorized into two types: those driven by an electric motor and those without.

[0003] Currently, the maintenance and adjustment of motorless variable-pitch propellers are generally characterized by cumbersome operations and limited accuracy. Conventional procedures require removing the propeller from the aircraft and placing it horizontally, followed by measuring and calibrating the installation angle at specific locations on the blades using an angle gauge. Because the propeller surface is often a complex aerodynamic surface, traditional angle gauges are prone to errors when measuring on non-planar surfaces, resulting in low calibration accuracy. Furthermore, the angle gauge typically needs to be placed horizontally to ensure accurate readings; therefore, the pitch-changing process is not only time-consuming but also heavily reliant on operator experience, further increasing the difficulty of adjustment and the uncertainty of actual operation. This situation limits the application of motorless variable-pitch propellers in situations requiring frequent adjustments or high-precision control.

[0004] Therefore, there is an urgent need to provide a variable pitch propeller that can achieve rapid pitch change and high pitch change accuracy to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to at least solve the problem of how to achieve rapid pitch change and improve pitch change accuracy in variable-pitch propellers. This purpose is achieved through the following technical solution:

[0006] The first aspect of this utility model provides a variable-pitch propeller, comprising:

[0007] Multiple blades, each blade including a blade body and a positioning protrusion, the positioning protrusion being disposed at the root of the blade body;

[0008] A hub assembly includes a detachably connected first hub and a second hub. The first hub includes a first hub body and a plurality of first connecting parts, which are arranged circumferentially along the first hub body. The second hub includes a second hub body and a plurality of second connecting parts, which are arranged circumferentially along the second hub. The first hub body and the second hub body are positioned opposite each other, and the first connecting parts and the second connecting parts are positioned opposite each other. The first connecting parts and the opposing second connecting parts form a slot, which is used to insert into the root of the blade body. The first hub body and the second hub body are spliced ​​together to form a plurality of opening slots, which are correspondingly arranged with the slots and communicate with the slots.

[0009] Multiple positioning plates are inserted into the opening slot. Each positioning plate has a positioning hole, which is a non-circular hole. The positioning hole is inserted into the positioning protrusion to define the installation angle of the blade.

[0010] Using the variable-pitch propeller provided by this technical solution, when adjusting the blade installation angle, simply loosen the first and second hubs slightly to release the clamping force on the blades, allowing the blades to move within a small range within the slot. Then, remove the positioning plate currently inserted in the slot and select a pre-made positioning plate whose positioning hole angle precisely corresponds to the target installation angle. Reinsert the selected positioning plate into the slot. Next, manually rotate the blade to precisely align the positioning protrusion at its root with the non-circular positioning hole at a specific angle on the positioning plate and insert it. After all blades have been adjusted, simply retighten the hub assembly to securely lock the blades and positioning plates, thus efficiently and accurately completing the entire installation angle adjustment process.

[0011] This design achieves in-situ pitch control, eliminating the traditional method of disassembling the entire propeller from the aircraft, placing it horizontally, and performing tedious measurements and calibrations using an angle gauge. This not only saves significant manpower, time, and tool preparation but also greatly improves operational convenience, making it particularly suitable for rapid adjustments in the field or under limited conditions. Secondly, pitch control accuracy is fundamentally guaranteed. Accuracy no longer depends on the operator's experience and visual interpretation of angle gauge readings but is determined by the mechanical structure itself—each non-circular positioning hole on the positioning plate is precisely machined to a specific angle during manufacturing. This means that as long as the positioning protrusion fully engages with the positioning hole, its installation angle is uniquely and precisely determined, fundamentally eliminating human measurement errors and ensuring the consistency of all blade angles. This allows for stable optimization of the propeller's aerodynamic efficiency and overall performance under different flight conditions.

[0012] In addition, the variable-pitch propeller of this utility model may also have the following additional technical features:

[0013] In some embodiments of this utility model, the blade further includes a limiting part, which is located between the blade body and the positioning protrusion. The outer diameter of the limiting part is larger than the outer diameter of the root of the blade body. The first hub body and the second hub body are spliced ​​together to form a plurality of limiting grooves. The opening groove and the slot are connected through the limiting groove. The inner diameter of the limiting groove is larger than the inner diameter of the slot. The limiting part is located in the limiting groove.

[0014] In some embodiments of this utility model, the limiting groove is a through groove.

[0015] In some embodiments of this utility model, the blade further includes a transition section, the limiting part and the blade body are connected through the transition section, and the outer diameter of the transition section gradually increases from the blade body to the limiting part.

[0016] In some embodiments of this utility model, the bottom of the opening groove is provided with an installation groove, and the bottom of the positioning plate is inserted into the installation groove.

[0017] In some embodiments of this utility model, a first mounting portion protrudes from the middle of the first wheel hub body, and a second mounting portion protrudes from the middle of the second wheel hub body, and the first mounting portion and the second mounting portion are connected.

[0018] In some embodiments of this utility model, the first mounting part is provided with a plug-in part, and the second mounting part is provided with a plug-in groove, wherein the plug-in part and the plug-in groove are plugged in.

[0019] In some embodiments of this utility model, the first connecting part includes a first arc-shaped plate and two first extension plates, the two first extension plates being respectively connected to both sides of the first arc-shaped plate; the second connecting part includes a second arc-shaped plate and two second extension plates, the two second extension plates being respectively connected to both sides of the second arc-shaped plate; the first arc-shaped plate and the second arc-shaped plate are spliced ​​together to form the slot; and the first extension plate and the second extension plate are connected.

[0020] In some embodiments of this utility model, the first extension plate and the second extension plate are connected by threaded connectors.

[0021] In some embodiments of this utility model, a first through hole is formed at the center of the first hub, and a second through hole is formed at the center of the second hub, wherein the first through hole and the second through hole are connected. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0023] Figure 1 A partial structural schematic diagram of a variable-pitch propeller according to an embodiment of the present invention is shown schematically.

[0024] Figure 2 A schematic cross-sectional view of a variable-pitch propeller according to an embodiment of the present invention is shown.

[0025] Figure 3 A schematic diagram of a partial structure of a blade according to an embodiment of the present invention is shown.

[0026] Figure 4 A schematic diagram of the positioning plate according to an embodiment of the present invention is shown.

[0027] The labels in the attached diagram are as follows:

[0028] 100. Blade; 110. Blade body; 120. Positioning protrusion; 130. Limiting part; 140. Transition section;

[0029] 200. Wheel hub assembly; 201. Opening groove; 202. Limiting groove; 203. Slot;

[0030] 210, First hub; 210a, First through hole; 211, First hub body; 211a, First mounting part; 211b, Insertion part; 212, First connecting part; 212a, First arc-shaped plate; 212b, First extension plate;

[0031] 220, Second hub; 220a, Second through hole; 221, Second hub body; 221a, Second mounting part; 221b, Insertion groove; 222, Second connecting part;

[0032] 300, Positioning plate; 310, Positioning socket. Detailed Implementation

[0033] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0034] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0035] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0036] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.

[0037] Figure 1 A partial structural diagram of a variable-pitch propeller according to an embodiment of the present invention is shown schematically. Figure 2 A schematic cross-sectional view of a variable-pitch propeller according to an embodiment of the present invention is shown. Figure 3 A partial structural diagram of the blade 100 according to an embodiment of the present invention is shown schematically. Figure 4A schematic diagram of the positioning plate 300 according to an embodiment of the present invention is shown. See also Figures 1 to 4 This utility model proposes a variable-pitch propeller, including multiple blades 100, a hub assembly 200, and multiple positioning plates 300. Each blade 100 includes a blade body 110 and a positioning protrusion 120, with the positioning protrusion 120 disposed at the root of the blade body 110. The hub assembly 200 includes a detachably connected first hub 210 and a second hub 220. The first hub 210 includes a first hub body 211 and multiple first connecting portions 212, which are arranged circumferentially along the first hub body 211. The second hub 220 includes a second hub body 221 and multiple second connecting portions 222, which are arranged circumferentially along the second hub 220. The first hub body 211 and the second hub body 221 are positioned opposite each other, and the first connecting part 212 and the second connecting part 222 are positioned opposite each other. The first connecting part 212 and the opposite second connecting part 222 form a slot 203. The slot 203 is used to insert into the root of the blade body 110. The first hub body 211 and the second hub body 221 are spliced ​​to form multiple opening slots 201. The opening slots 201 and the slots 203 are correspondingly arranged and communicate with the slots 203. The positioning plate 300 is inserted into the opening slots 201. The positioning plate 300 is provided with a positioning insertion hole 310. The positioning insertion hole 310 is a non-circular hole and is used to insert into the positioning protrusion 120.

[0038] Using the variable-pitch propeller provided by this technical solution, when the installation angle of the blade 100 needs to be adjusted, simply loosen the first hub 210 and the second hub 220 slightly to release the clamping force of the hub on the blade 100, allowing the blade 100 to move within a small range within the slot 203. Then, remove the positioning plate 300 currently inserted in the opening slot 201, and select a pre-made positioning plate 300 whose positioning hole 310 angle precisely corresponds to the target installation angle. Reinsert the selected positioning plate 300 into the opening slot 201. Next, manually rotate the blade 100 to precisely align and insert it with the positioning protrusion 120 at its root and the non-circular positioning hole 310 at a specific angle on the positioning plate 300. After all blades 100 have been adjusted, simply retighten the hub assembly 200 to securely lock the blade 100 and positioning plate 300 together, thus efficiently and accurately completing the entire installation angle adjustment process.

[0039] This design achieves in-situ pitch control, eliminating the traditional method of disassembling the entire propeller from the aircraft, placing it horizontally, and performing tedious measurements and calibrations using an angle gauge. This not only saves significant manpower, time, and tool preparation but also greatly improves operational convenience, making it particularly suitable for rapid adjustments in the field or under limited conditions. Secondly, pitch control accuracy is fundamentally guaranteed. Accuracy no longer depends on the operator's experience and visual interpretation of angle gauge readings but is determined by the mechanical structure itself—the non-circular positioning holes 310 on each positioning plate 300 are precisely machined to a specific angle during manufacturing. This means that as long as the positioning protrusion 120 fully engages with the positioning hole 310, its installation angle is uniquely and precisely determined, fundamentally eliminating human measurement errors and ensuring the consistency of the angles of all blades 100°. This allows for stable optimization of the propeller's aerodynamic efficiency and overall performance under different flight conditions.

[0040] Optionally, the positioning plate 300 has a square plate structure. The square structure design prevents the positioning plate 300 from rotating within the opening slot 201, thereby preventing the blade 100 from becoming loose. Optionally, the positioning hole 310 can be a strip-shaped hole, an oblong hole, or a cross-shaped hole, etc., and the shape of the positioning protrusion 120 is matched with the shape of the positioning hole 310. The root of the blade body 110 is cylindrical, so that the blade 100 can rotate inside the slot 203 when adjusting the mounting angle.

[0041] Furthermore, the blade 100 also includes a limiting part 130, which is located between the blade body 110 and the positioning protrusion 120. The outer diameter of the limiting part 130 is larger than the outer diameter of the root of the blade body 110. The first hub body 211 and the second hub body 221 are spliced ​​to form a plurality of limiting grooves 202. The opening groove 201 and the slot 203 are connected through the limiting grooves 202. The inner diameter of the limiting groove 202 is larger than the inner diameter of the slot 203. The limiting part 130 is located in the limiting groove 202.

[0042] The addition of a limiting part 130 at the root of the blade 100 and a limiting groove 202 that mates with the hub assembly 200 significantly improves the reliability and assembly precision of the variable-pitch propeller. The limiting part 130 is located between the blade body 110 and the positioning protrusion 120, and its outer diameter is significantly larger than the outer diameter of the root of the blade body 110. Correspondingly, when the first hub 210 and the second hub 220 are assembled, the opening groove 201, the limiting groove 202, and the slot 203 are interconnected, forming a multi-level depth installation space. This design achieves precise axial positioning of the blade 100. During assembly or pitch control, the limiting part 130 is accommodated within the size-matched limiting groove 202, and its larger outer diameter effectively prevents accidental loosening or excessive axial movement of the blade 100, thereby ensuring that the blade 100 maintains a stable installation position when subjected to complex aerodynamic loads and rotational centrifugal forces. This not only enhances the overall rigidity and reliability of the connection, but also indirectly ensures that the alignment between the positioning protrusion 120 and the positioning hole 310 on the positioning plate 300 will not fail due to axial displacement, further consolidating the accuracy of the angle setting.

[0043] Furthermore, the limiting groove 202 is a through groove.

[0044] In other words, the limiting groove 202 forms openings on the first hub body 211 and the second hub body 221 respectively, so that the limiting part 130 can be observed through the openings to see whether it is installed in place, which brings convenience to the installation operation.

[0045] Furthermore, the blade 100 also includes a transition section 140, the limiting part 130 and the blade body 110 are connected by the transition section 140, and the outer diameter of the transition section 140 gradually increases from the blade body 110 to the limiting part 130.

[0046] The transition section 140 significantly optimizes stress distribution and improves fatigue life. During high-speed propeller rotation, the root of the blade 100 bears enormous centrifugal force, aerodynamic loads, and alternating stress, making it the most critical load-bearing area in the structure. If the limiting part 130 and the blade body 110 are connected by a right-angle step or abrupt cross-section, severe stress concentration will occur at this point, easily leading to cracks and ultimately structural fatigue failure. The smooth, gradual design of the transition section 140 smoothly transfers stress from the blade body 110 to the limiting part 130, significantly reducing the stress concentration factor and thus greatly improving the structural integrity and long-term reliability of the blade 100 root. Furthermore, when inserting the blade 100 into the slot 203 and adjusting the pitch, the operator needs to rotate the blade 100. The transition section 140 effectively prevents wear between the limiting part 130 and the edge of the limiting slot 202, thereby protecting the accuracy of critical positioning features.

[0047] Furthermore, the bottom of the opening groove 201 is provided with an installation groove, and the bottom of the positioning plate 300 is inserted into the installation groove.

[0048] The mounting slot enables radial and circumferential positioning of the positioning plate 300. When the positioning plate 300 is inserted, its bottom is strictly confined within the mounting slot, effectively preventing any slight wobbling or offset of the positioning plate 300 in the radial (propeller radius direction) and circumferential directions. This rigid constraint ensures that the positioning socket 310 and the positioning protrusion 120 are always in the predetermined precise relative position, thereby ensuring that the installation angle setting is absolutely accurate during each pitch adjustment. In addition, the mounting slot simplifies the assembly operation and provides clear feedback on the assembly position. The mounting slot provides limits on the insertion depth and final position of the positioning plate 300. When replacing the positioning plate 300, the operator only needs to push its bottom into the mounting slot until it cannot move further; this error-proof design makes the assembly process more intuitive and faster.

[0049] Furthermore, in this embodiment, the first hub 210 has a first mounting portion 211a protruding from its center, and the second hub 220 has a second mounting portion 221a protruding from its center, and the first mounting portion 211a and the second mounting portion 221a are connected.

[0050] Because the mounting portion protrudes from the bottom surface of the hub body, the outer peripheries of the first hub body 211 and the second hub body 221 are spaced apart, thereby creating space for the limiting groove 202 and the opening groove 201. This structural arrangement can effectively reduce the weight of the hub assembly 200 and effectively improve the propeller's power performance and response efficiency. Optionally, the first mounting portion 211a and the second mounting portion 221a are connected by bolts.

[0051] Furthermore, the first mounting part 211a is provided with a protruding insertion part 211b, and the second mounting part 221a is provided with an insertion groove 221b, and the insertion part 211b and the insertion groove 221b are inserted into each other.

[0052] By engaging the insertion part 211b and the insertion slot 221b, the installation accuracy of the first hub body 211 and the second hub body 221 is ensured, thereby avoiding misalignment of the first connecting part 212 and the second connecting part 222 and reducing assembly errors.

[0053] Furthermore, the first connecting part 212 includes a first arc-shaped plate 212a and two first extension plates 212b, the two first extension plates 212b being respectively connected to both sides of the first arc-shaped plate 212a. The second connecting part 222 includes a second arc-shaped plate and two second extension plates, the two second extension plates being respectively connected to both sides of the second arc-shaped plate. The first arc-shaped plate 212a and the second arc-shaped plate are spliced ​​to form a slot 203, and the first extension plate 212b and the second extension plate are connected.

[0054] Furthermore, the first extension plate 212b and the second extension plate are connected by a threaded connector.

[0055] The use of threaded fasteners makes assembly or pitch adjustment very convenient. When assembly or pitch adjustment is required, simply loosen the threaded fasteners without completely disassembling the first hub 210 and the second hub 220. Optionally, the threaded fasteners can be bolts.

[0056] Furthermore, the first hub 210 has a first through hole 210a at its center, and the second hub 220 has a second through hole 220a at its center, with the first through hole 210a and the second through hole 220a connected together.

[0057] The propeller and the main body of the aircraft can be installed through the first through hole 210a and the second through hole 220a.

[0058] The pitch-changing process of the variable-pitch propeller provided in this embodiment is as follows:

[0059] Loosen the screws so that the distance between the first hub 210 and the second hub 220 is greater than 2mm, allowing the blade 100 to move within a small range within the slot 203. Then, remove the positioning plate 300 currently inserted in the opening slot 201, and select a pre-made positioning plate 300 whose positioning hole 310 angle precisely corresponds to the target mounting angle. Reinsert the selected positioning plate 300 into the opening slot 201, ensuring its bottom is inserted into the mounting groove. Next, manually rotate the blade 100 until the positioning protrusion 120 at its base is precisely aligned with the positioning hole 310 at a specific angle on the positioning plate 300 and inserted. After all blades 100 are adjusted, simply retighten the bolts to securely lock the blades 100 and positioning plates 300 together.

[0060] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A variable-pitch propeller, characterized in that, include: Multiple blades (100), each blade (100) includes a blade body (110) and a positioning protrusion (120), the positioning protrusion (120) being disposed at the root of the blade body (110); A wheel hub assembly (200) includes a first wheel hub (210) and a second wheel hub (220) detachably connected. The first wheel hub (210) includes a first wheel hub body (211) and a plurality of first connecting portions (212), which are arranged circumferentially along the first wheel hub body (211). The second wheel hub (220) includes a second wheel hub body (221) and a plurality of second connecting portions (222), which are arranged circumferentially along the second wheel hub (220). 211) and the second hub body (221) are arranged opposite each other, the first connecting part (212) and the second connecting part (222) are arranged opposite each other, the first connecting part (212) and the second connecting part (222) are arranged opposite each other to form a slot (203), the slot (203) is used to be inserted into the root of the blade body (110), the first hub body (211) and the second hub body (221) are spliced ​​to form a plurality of opening slots (201), the opening slots (201) and the slots (203) are correspondingly arranged and communicate with the slots (203); Multiple positioning plates (300) are inserted into the opening slot (201). The positioning plates (300) are provided with positioning holes (310). The positioning holes (310) are non-circular holes. The positioning holes (310) are inserted into the positioning protrusion (120) to define the installation angle of the blade (100).

2. The variable-pitch propeller according to claim 1, characterized in that, The blade (100) also includes a limiting part (130), which is located between the blade body (110) and the positioning protrusion (120). The outer diameter of the limiting part (130) is larger than the outer diameter of the root of the blade body (110). The first hub body (211) and the second hub body (221) are spliced ​​to form a plurality of limiting grooves (202). The opening groove (201) and the slot (203) are connected through the limiting groove (202). The inner diameter of the limiting groove (202) is larger than the inner diameter of the slot (203). The limiting part (130) is located in the limiting groove (202).

3. The variable-pitch propeller according to claim 2, characterized in that, The limiting groove (202) is a through groove.

4. The variable-pitch propeller according to claim 2, characterized in that, The blade (100) further includes a transition section (140), the limiting part (130) and the blade body (110) are connected through the transition section (140), and the outer diameter of the transition section (140) gradually increases from the blade body (110) to the limiting part (130).

5. The variable-pitch propeller according to claim 1, characterized in that, The bottom of the opening groove (201) is provided with an installation groove, and the bottom of the positioning plate (300) is inserted into the installation groove.

6. The variable-pitch propeller according to claim 1, characterized in that, The first hub body (211) has a first mounting part (211a) protruding from the middle, and the second hub body (221) has a second mounting part (221a) protruding from the middle, and the first mounting part (211a) and the second mounting part (221a) are connected.

7. The variable-pitch propeller according to claim 6, characterized in that, The first mounting part (211a) is provided with a plug-in part (211b), and the second mounting part (221a) is provided with a plug-in groove (221b). The plug-in part (211b) and the plug-in groove (221b) are plugged into each other.

8. The variable-pitch propeller according to claim 1, characterized in that, The first connecting part (212) includes a first arc-shaped plate (212a) and two first extension plates (212b), the two first extension plates (212b) are respectively connected to both sides of the first arc-shaped plate (212a), the second connecting part (222) includes a second arc-shaped plate and two second extension plates, the two second extension plates are respectively connected to both sides of the second arc-shaped plate, the first arc-shaped plate (212a) and the second arc-shaped plate are spliced ​​to form the slot (203), and the first extension plate (212b) and the second extension plate are connected.

9. The variable-pitch propeller according to claim 8, characterized in that, The first extension plate (212b) and the second extension plate are connected by a threaded connector.

10. The variable-pitch propeller according to any one of claims 1-9, characterized in that, The first hub (210) has a first through hole (210a) at its center, and the second hub (220) has a second through hole (220a) at its center. The first through hole (210a) and the second through hole (220a) are connected.

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