A connection structure between propeller blades and pitch-changing device

Abstract

The present invention discloses a connection structure between a propeller blade and a pitch-changing device, and specifically relates to the technical field of propellers, including a propeller shaft, wherein the upper end of the propeller shaft is fixedly connected to a propeller hub, and the upper part of the outer surface of the propeller shaft is equidistantly annularly distributed and fixedly connected to cylinders, and the inner surfaces of the three cylinders are all rotatably connected to round rods, and the ends of the three round rods that are away from each other are all fixedly connected to blades by bolts, and the outer surface of the propeller shaft is provided with an angle adjustment component, and the inner surfaces of the three cylinders are all provided with sealing components. The connection structure between a propeller blade and a pitch-changing device described in the present invention is provided with an angle adjustment component, so that each blade on the propeller shaft can be adjusted in angle during rotation, and multiple blades can also be uniformly adjusted according to actual needs, so as to meet the use requirements of helicopters in different flight scenarios, improve the flight stability and maneuverability of the helicopter, and effectively improve the flight safety and fault tolerance of the helicopter.

Description

Technical Field

[0001] The present invention relates to the technical field of propellers, and in particular to a connection structure between a propeller blade and a pitch-changing device. Background Art

[0002] Helicopter propeller blades are key components in the helicopter rotor system. They consist of multiple blades that convert the power generated by the engine into aerodynamic force through rotation, thereby driving the helicopter forward, ascending, and performing various maneuvering flights.

[0003] Propeller blades and pitch devices are key parts of the aircraft power system. The blades are the main working parts of the propeller, responsible for converting the engine power into thrust. The pitch device can adjust the pitch of the blades (i.e. the angle between the blades and the rotating plane) to adapt to different flight stages and speed requirements;

[0004] The pitch adjustment device usually achieves pitch adjustment through hydraulic, electric or mechanical means. For example, the hydraulic variable pitch propeller uses the oil pressure to push the blade rotation mechanism, while the electric type is driven by an electric motor. These devices can ensure that the propeller provides the best thrust and efficiency during take-off, cruising and landing.

[0005] Chinese patent announcement number CN112478135B discloses a connection structure between a propeller blade and a pitch-changing device. Under the compression of a pressure block, the blade is fixed, tightened and self-locked with the root shaft of the blade in the axial direction through a conical sleeve block and transmits torque together. The root shaft of the blade supports and transmits the axial force and radial force of the blade through a rotatable end face support member 1 and a rotatable end face support member 2 respectively, and is connected to the hub and rotates relative to the hub. Under the axial tension of a pad and a locking member, the axial positions of the root shaft, the rotatable end face support member and the hub are fixed, and a sealing ring and a sealant are built in to seal the inner cavity of the hub. Under the centrifugal balancing of the balancing block, the centrifugal moment generated by the deviation of the center of gravity from the rotation axis of the blade can be reduced, and finally the blade can be inserted into the propeller for installation and fixation. However, the above patent document still has the following defects during implementation:

[0006] Although the above patent can seal and lock the blades during implementation, it is impossible to individually adjust each of the multiple blades, which reduces the flight stability and maneuverability of the helicopter during flight and fails to improve the flight safety and fault tolerance of the helicopter. Summary of the invention

[0007] The main purpose of the present invention is to provide a connection structure between a propeller blade and a pitch-changing device, which can effectively solve the problem that each blade cannot be adjusted.

[0008] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a connection structure between a propeller blade and a pitch-changing device, comprising a propeller shaft, the upper end of the propeller shaft is fixedly connected to a propeller hub, the upper part of the outer surface of the propeller shaft is annularly distributed and fixedly connected to cylinders at equal distances, the inner surfaces of the three cylinders are rotatably connected to round rods, the ends of the three round rods away from each other are fixedly connected to the propeller blades by bolts, the outer surface of the propeller shaft is provided with an angle adjustment component, and the inner surfaces of the three cylinders are provided with sealing components.

[0009] Preferably, the angle adjustment assembly includes a circular cover fixedly connected to the outer surface of the propeller shaft, a driving mechanism is provided on the inner surface of the circular cover, three clutch mechanisms are provided on the outer surface of the propeller shaft in an inner cavity of the circular cover and are equidistantly distributed in a ring shape, three pressing mechanisms are provided on the outer surface of the propeller shaft and are located above the clutch mechanism and are distributed in a ring shape, a locking mechanism is provided on one side of the three pressing mechanisms, and a transmission mechanism is provided on the outer surfaces of the three round rods.

[0010] Preferably, the driving mechanism includes a partition fixedly connected to the inner surface of the circular cover, and the upper end of the partition is annularly equidistantly distributed and extends through and to the lower end of the partition to be rotatably connected with a rotating rod, and the lower end of the rotating rod located on the left is fixedly connected to a motor fixedly connected to the lower part of the inner surface of the circular cover, and the outer surfaces of the three rotating rods are fixedly connected to transmission wheels, and the outer surfaces of the three transmission wheels are commonly wound with belts.

[0011] Preferably, the three clutch mechanisms include a ring fixedly connected to the outer surface of the propeller shaft, the inner surfaces of the three rings are rotatably connected to flywheels fixedly connected to the upper end of the rotating rod, the upper ends of the three flywheels are rotatably connected to clutch plates, the upper ends of the three clutch plates are fixedly installed with pressure plates, the upper ends of the three pressure plates are fixedly installed with diaphragm springs, and the upper ends of the three flywheels are fixedly installed with outer casings.

[0012] Preferably, the three downward pressing mechanisms include an L-shaped plate fixedly connected to the paddle shaft, an electric telescopic rod is fixedly installed in the middle of the lower ends of the three L-shaped plates, and a downward pressing round block is fixedly connected to the lower ends of the three electric telescopic rods.

[0013] Preferably, the three locking mechanisms include an arc block 1 fixedly connected to the outer surface of the electric telescopic rod, the inner surfaces of the three L-shaped plates are slidably connected with a clamping rod, the ends of the three clamping rods close to each other are fixedly connected to an arc block 2, the outer surfaces of the three clamping rods are sleeved with a spring 1, and the two ends of the three springs 1 are respectively fixedly connected to one end of the arc block 2 and one end of the L-shaped plate.

[0014] Preferably, the three transmission mechanisms include a gear 1 fixedly connected to the outer surface of the round rod, the lower parts of the three inner surfaces of the cylinders are penetrated and extended to the outer surface of the cylinders and are rotatably connected with connecting rods, the upper ends of the three connecting rods are fixedly connected to gear 2 meshing with the outer surface of gear 1, the lower ends of the three connecting rods are fixedly connected to gear 3 meshing with the inner surface of the clutch plate, the outer surfaces of the three connecting rods are slidably connected to the downward pressure round blocks, and the outer surfaces of the three connecting rods are annularly distributed with a number of clamping grooves that are compatible with the size and shape of the outer surface of the clamping rod.

[0015] Preferably, the three sealing assemblies include circular grooves opened on the inner surface of the cylinder, the inner surfaces of the three cylinders are all provided with a rotating mechanism, and the inner surfaces of the three circular grooves are all provided with a sealing mechanism.

[0016] Preferably, the three rotating mechanisms include circular groove blocks fixedly connected to the outer surface of the round rod, the outer surfaces of the three circular groove blocks are rotatably connected to the inner surface of the cylinder, and the inner surfaces of the three circular groove blocks are each provided with a plurality of balls.

[0017] Preferably, the three sealing mechanisms include sealing rings sleeved on the outer surface of the round rod, the outer surfaces of the three sealing rings are rotatably connected to the inner surface of the circular groove, and the inner cavities of the three sealing rings are all annularly distributed and fixedly connected with a plurality of springs 2.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In the present invention, by providing an angle adjustment component, each blade on the propeller shaft can be adjusted in angle during the rotation process, and multiple blades can also be uniformly adjusted according to actual needs, which can meet the use requirements of the helicopter in different flight scenarios, thereby improving the stability and maneuverability of the helicopter flight, and effectively improving the flight safety and fault tolerance of the helicopter.

[0020] 2. In the present invention, by providing a pressing mechanism and a locking mechanism, when the angle of the paddle is adjusted, the pressing round block is driven to move by the electric telescopic rod, and the clutch mechanism is cooperated to realize transmission or disconnection. During the up and down movement of the pressing mechanism, the clamping rod can fix the angle of the paddle after rotation. At the same time, when adjusting the angle, the clamping rod is no longer fixed, so that the angle of the paddle is fixed after adjustment, and the angle of the paddle is prevented from changing after the clutch is disconnected.

[0021] 3. In the present invention, by providing a sealing mechanism, the change of the sealing ring at the connection between the round rod and the cylinder at different temperatures can be achieved through the deformation of the second spring, so that the inner surface of the sealing ring can be tightly attached to the round rod, and the outer surface of the sealing ring can be tightly attached to the inner surface of the circular groove, thereby reducing the gap at the connection between the round rod and the cylinder under temperature changes, thereby reducing the entry of water vapor and improving the service life and flight stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the angle adjustment assembly and the sealing assembly of the present invention;

[0025] Figure 4 It is a schematic diagram of the driving mechanism structure of the present invention;

[0026] Figure 5 It is a schematic diagram of the explosion effect of the clutch mechanism of the present invention;

[0027] Figure 6 It is a schematic diagram of the structure of the pressing mechanism and the locking mechanism of the present invention;

[0028] Figure 7 It is a schematic diagram of the transmission mechanism structure of the present invention;

[0029] Figure 8 It is a schematic diagram of the cross-sectional structure of a circular groove of the present invention;

[0030] Fig. 9 It is a schematic diagram of the rotating mechanism structure of the present invention;

[0031] Fig.10 It is a schematic diagram of the cross-sectional structure of the sealing mechanism of the present invention.

[0032] In the figure: 1, propeller shaft; 2, propeller hub; 3, propeller blade; 4, cylinder; 5, angle adjustment assembly; 51, circular cover; 52, driving mechanism; 521, partition; 522, rotating rod; 523, transmission wheel; 524, belt; 525, motor; 53, clutch mechanism; 531, ring; 532, flywheel; 533, clutch plate; 534, pressure plate; 535, diaphragm spring; 536, housing; 54, pressing mechanism; 541, L-shaped plate; 542, electric telescopic rod; 543, pressing round block; 55, locking mechanism; 551, latching rod; 552, arc surface block one; 553, arc surface block two; 554, spring one; 56, transmission mechanism; 561, gear one; 562, connecting rod; 563, gear two; 564, gear three; 565, latching groove; 6, sealing assembly; 61, circular groove; 62, rotating mechanism; 621, circular groove block; 622, ball bearing; 63, sealing mechanism; 631, sealing ring; 632, spring two; 7, round rod. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0034] Embodiment 1, as Figure 1 and Figure 2 As shown, a connection structure between a propeller blade and a pitch-changing device comprises a propeller shaft 1, a propeller hub 2 is fixedly connected to the upper end of the propeller shaft 1, cylinders 4 are fixedly connected to the upper outer surface of the propeller shaft 1 in an annular distribution at equal distances, three cylinders 4 are rotatably connected to the inner surfaces of the three cylinders 4, and the ends of the three round rods 7 away from each other are fixedly connected to the blades 3 by bolts, an angle adjustment component 5 is arranged on the outer surface of the propeller shaft 1, and sealing components 6 are arranged on the inner surfaces of the three cylinders 4.

[0035] During the implementation of this embodiment, the angle of a single blade 3 is adjusted by the angle adjustment component 5 when the blade shaft 1 rotates, and the blade 3 is fixed after it rotates to the set angle, so that the angle of a single blade 3 can be adjusted, and the angles of multiple blades 3 can also be adjusted uniformly. During the rotation of the round rod 7, the connection between the round rod 7 and the cylinder 4 is sealed by the sealing component 6 to enhance the sealing ability and reduce the entry of water vapor.

[0036] Specifically, in order to achieve the individual adjustment of each blade 3 and maintain the adjusted angle, refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7In this embodiment, the angle adjustment assembly 5 includes a circular cover 51 fixedly connected to the outer surface of the propeller shaft 1, a driving mechanism 52 is arranged on the inner surface of the circular cover 51, three clutch mechanisms 53 are arranged in an annular manner and equidistantly on the outer surface of the propeller shaft 1 in the inner cavity of the circular cover 51, three pressing mechanisms 54 are arranged in an annular manner above the clutch mechanism 53 on the outer surface of the propeller shaft 1, a locking mechanism 55 is arranged on one side of the three pressing mechanisms 54, and a transmission mechanism 56 is arranged on the outer surfaces of the three round rods 7.

[0037] For further information, see Figure 3 and Figure 4 In this embodiment, the driving mechanism 52 includes a partition 521 fixedly connected to the inner surface of the circular cover 51, and a rotating rod 522 is rotatably connected to the upper end of the partition 521 and extends to the lower end of the partition 521. The lower end of the left rotating rod 522 is fixedly connected to a motor 525 fixedly connected to the lower part of the inner surface of the circular cover 51, and the outer surfaces of the three rotating rods 522 are fixedly connected to transmission wheels 523, and the outer surfaces of the three transmission wheels 523 are commonly wound with a belt 524.

[0038] During the implementation process, the motor 525 is started so that the output end of the motor 525 drives the rotating rod 522 located on the left to rotate, and under the action of the transmission wheel 523 and the belt 524, the other two rotating rods 522 rotate.

[0039] The three transmission wheels 523 mentioned above are in the same horizontal plane, and the circular connecting lines of the three transmission wheels 523 form congruent triangles.

[0040] For further information, see Figure 3 and Figure 6 In this embodiment, the three downward pressing mechanisms 54 include an L-shaped plate 541 fixedly connected to the propeller shaft 1, and an electric telescopic rod 542 is fixedly installed in the middle of the lower end of the three L-shaped plates 541, and a downward pressing round block 543 is fixedly connected to the lower end of the three electric telescopic rods 542.

[0041] For further information, see Figure 3 and Figure 5 In this embodiment, the three clutch mechanisms 53 include a circular ring 531 fixedly connected to the outer surface of the propeller shaft 1, the inner surfaces of the three circular rings 531 are rotatably connected to the flywheels 532 fixedly connected to the upper end of the rotating rod 522, the upper ends of the three flywheels 532 are rotatably connected to clutch plates 533, the upper ends of the three clutch plates 533 are fixedly installed with pressure plates 534, the upper ends of the three pressure plates 534 are fixedly installed with diaphragm springs 535, and the upper ends of the three flywheels 532 are fixedly installed with outer shells 536.

[0042] During the implementation process, when it is necessary to adjust the angle of the paddle 3 separately, the electric telescopic rod 542 is started, so that the lower end of the electric telescopic rod 542 drives the pressing round block 543 to move upward, so that the pressing round block 543 no longer squeezes the diaphragm spring 535, so that the diaphragm spring 535 drives the clutch plate 533 on the pressure plate 534 to be close to the upper end of the flywheel 532. Due to the large friction force at the lower end of the clutch plate 533, the rotating rod 522 drives the clutch plate 533 to rotate during the rotation of the flywheel 532, thereby realizing transmission.

[0043] Secondly, when there is no need to adjust the angle of the paddle blade, the electric telescopic rod 542 is started, so that the lower end of the electric telescopic rod 542 drives the downward pressing round block 543 to move downward, so that the downward pressing round block 543 squeezes the diaphragm spring 535, so that the diaphragm spring 535 drives the clutch plate 533 on the pressure plate 534 away from the upper end of the flywheel 532, so that the flywheel 532 cannot drive the clutch plate 533 to rotate during the rotation, and thus transmission cannot be achieved.

[0044] The flywheel 532, clutch plate 533, pressure plate 534 and diaphragm spring 535 mentioned above are all mature clutch components in the prior art.

[0045] For further information, see Figure 3 and Figure 7 In this embodiment, the three transmission mechanisms 56 include a gear 1 561 fixedly connected to the outer surface of the round rod 7, the lower parts of the inner surfaces of the three cylinders 4 penetrate and extend to the outer surface of the cylinder 4 and are rotatably connected with connecting rods 562, the upper ends of the three connecting rods 562 are fixedly connected to gear 2 563 meshingly connected to the outer surface of the gear 1 561, the lower ends of the three connecting rods 562 are fixedly connected to gear 3 564 meshingly connected to the inner surface of the clutch plate 533, the outer surfaces of the three connecting rods 562 are slidably connected to the downward pressing round block 543, and the outer surfaces of the three connecting rods 562 are annularly distributed with a plurality of clamping grooves 565 that are compatible with the size and shape of the outer surface of the clamping rod 551.

[0046] During the implementation process, when the clutch plate 533 rotates, since the gear three 564 is meshingly connected with the inner surface of the clutch plate 533, the clutch plate 533 drives the connecting rod 562 to rotate during the rotation, and then drives the gear two 563 to rotate. Under the action of the meshing connection, the round rod 7 on the gear three 564 rotates, thereby realizing the angle adjustment of the paddle 3.

[0047] For further information, see Figure 3 and Figure 6In this embodiment, the three locking mechanisms 55 include an arc block 1 552 fixedly connected to the outer surface of the electric telescopic rod 542, the inner surfaces of the three L-shaped plates 541 are slidably connected with a clamping rod 551, the ends of the three clamping rods 551 close to each other are fixedly connected with an arc block 2 553, and the outer surfaces of the three clamping rods 551 are sleeved with a spring 1 554, and the two ends of the three springs 1 554 are respectively fixedly connected to one end of the arc block 2 553 and one end of the L-shaped plate 541.

[0048] As can be seen from the above, after the angle of the paddle 3 is adjusted, the electric telescopic rod 542 will drive the arc block 2 553 to move downward, thereby making the arc block 2 553 close to the arc block 1 552. At this time, the arc block 1 552 will be squeezed, and the spring 1 554 will gradually be in a compressed state. After the clutch plate 533 is away from the flywheel 532, the electric telescopic rod 542 can drive the arc block 1 552 to move downward and squeeze the arc block 2 553, thereby pushing the clamping rod 551 to be clamped in the clamping groove 565 on the connecting rod 562, so that the angle of the paddle 3 after adjustment is fixed, and the angle of the paddle 3 after adjustment is prevented from changing during the rotation process.

[0049] Secondly, when adjusting the angle of the paddle 3, the electric telescopic rod 542 will move upward, so that the arc block 2 553 is away from the arc block 1 552. At the same time, the arc block 1 552 is no longer squeezed. Under the action of the spring 1 554, the arc block 1 552 is reset. At the same time, the locking rod 551 is away from the locking groove 565, so that the connecting rod 562 is no longer locked, and the connecting rod 562 can rotate with the clutch plate 533 to achieve the angle adjustment operation of the paddle 3.

[0050] Embodiment 2: Based on Embodiment 1, this embodiment adds a sealing component 6 for limiting and sealing the position of the paddle 3, so as to achieve the purpose of limiting and sealing the position of the paddle 3.

[0051] Specifically, in order to seal the position of the blade 3, refer to Figure 3 , Figure 8 , Fig. 9 and Fig.10 In this embodiment, the three sealing components 6 include circular grooves 61 opened on the inner surface of the cylinder 4, the inner surfaces of the three cylinders 4 are all provided with rotating mechanisms 62, and the inner surfaces of the three circular grooves 61 are all provided with sealing mechanisms 63.

[0052] For further information, see Figure 3 , Figure 8 and Fig. 9In this embodiment, the three rotating mechanisms 62 include a circular groove block 621 fixedly connected to the outer surface of the round rod 7, the outer surfaces of the three circular groove blocks 621 are rotatably connected to the inner surface of the cylinder 4, and the inner surfaces of the three circular groove blocks 621 are each provided with a plurality of balls 622.

[0053] For further information, see Figure 3 , Figure 8 and Fig.10 In this embodiment, the three sealing mechanisms 63 include a sealing ring 631 sleeved on the outer surface of the round rod 7, the outer surfaces of the three sealing rings 631 are rotatably connected to the inner surface of the circular groove 61, and the inner cavities of the three sealing rings 631 are all annularly distributed and fixedly connected with a plurality of springs 632.

[0054] During the implementation process, since the paddle 3 is used in the external environment, the sealing ring 631 will be exposed to different ambient temperatures due to long-term use. The sealing ring 631 will expand and contract due to the temperature change, causing a gap at the connection between the round rod 7 and the cylinder 4, allowing water vapor in the air to enter the connection and cause damage. The spring 632 is arranged inside the sealing ring 631, so that the sealing ring 631 can always be tightly attached to the outer surface of the round rod 7 and the inner surface of the circular groove 61, thereby reducing the gap caused by the thermal expansion and contraction of the sealing ring 631 and reducing the water vapor in the air from entering the connection.

[0055] Working process: when in use, the rotating rod 522 in the driving mechanism 52 is rotated to drive the flywheel 532 in the clutch mechanism 53 to rotate. Under the cooperation of the pressing mechanism 54, the clutch plate 533 in the clutch mechanism 53 can be disconnected or connected with the rotating flywheel 532, so that the transmission mechanism 56 can be operated or stopped, and the blade 3 can be driven to adjust the angle. After the adjustment, during the movement of the pressing mechanism 54, the blade 3 after the angle adjustment is fixed by the locking mechanism 55, so that the adjustment operation of the single blade 3 can be achieved under the action of the clutch mechanism 53, and the unified adjustment of multiple blades 3 can also be performed. When the blade 3 is used in different temperature environments, the spring 2 632 in the sealing mechanism can be used to make the outer surface and inner surface of the sealing ring 631 close to the inner surface of the circular groove 61 and the outer surface of the round rod 7 respectively. Under temperature changes, the gap at the connection between the round rod 7 and the cylinder 4 is reduced, and the entry of water vapor into the connection is reduced.

[0056] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A connection structure between a propeller blade and a pitch-changing device, comprising a propeller shaft (1), characterized in that: The upper end of the propeller shaft (1) is fixedly connected to a propeller hub (2); cylinders (4) are fixedly connected to the upper portion of the outer surface of the propeller shaft (1) at equal intervals and in an annular distribution; the inner surfaces of the three cylinders (4) are rotatably connected to round rods (7); the ends of the three round rods (7) that are away from each other are fixedly connected to the propeller blades (3) by bolts; the outer surface of the propeller shaft (1) is provided with an angle adjustment component (5); and the inner surfaces of the three cylinders (4) are provided with sealing components (6); The angle adjustment assembly (5) comprises a circular cover (51) fixedly connected to the outer surface of the propeller shaft (1); a driving mechanism (52) is arranged on the inner surface of the circular cover (51); three clutch mechanisms (53) are arranged in an annular manner and equidistantly on the outer surface of the propeller shaft (1) in the inner cavity of the circular cover (51); three pressing mechanisms (54) are arranged in an annular manner and above the clutch mechanisms (53) on the outer surface of the propeller shaft (1); a locking mechanism (55) is arranged on one side of the three pressing mechanisms (54); and a transmission mechanism (56) is arranged on the outer surfaces of the three round rods (7); The three downward pressing mechanisms (54) comprise an L-shaped plate (541) fixedly connected to the propeller shaft (1); an electric telescopic rod (542) is fixedly mounted at the middle of the lower end of each of the three L-shaped plates (541); and a downward pressing round block (543) is fixedly connected at the lower end of each of the three electric telescopic rods (542); The driving mechanism (52) comprises a partition (521) fixedly connected to the inner surface of the circular cover (51), and a rotating rod (522) is rotatably connected to the upper end of the partition (521) and is distributed in an annular manner at equal distances and extends to the lower end of the partition (521); The three clutch mechanisms (53) comprise a circular ring (531) fixedly connected to the outer surface of the propeller shaft (1); the inner surfaces of the three circular rings (531) are rotatably connected to a flywheel (532) fixedly connected to the upper end of the rotating rod (522); the upper ends of the three flywheels (532) are rotatably connected to a clutch plate (533); The three locking mechanisms (55) include an arc surface block 1 (552) fixedly connected to the outer surface of the electric telescopic rod (542); the inner surfaces of the three L-shaped plates (541) are slidably connected to the clamping rods (551); the ends of the three clamping rods (551) close to each other are fixedly connected to the arc surface block 2 (553); the outer surfaces of the three clamping rods (551) are sleeved with springs 1 (554); and the two ends of the three springs 1 (554) are respectively fixedly connected to one end of the arc surface block 2 (553) and one end of the L-shaped plate (541); The three transmission mechanisms (56) include a gear 1 (561) fixedly connected to the outer surface of the round rod (7); the lower parts of the inner surfaces of the three cylinders (4) penetrate through and extend to the outer surface of the cylinder (4) and are rotatably connected to a connecting rod (562); the upper ends of the three connecting rods (562) are fixedly connected to a gear 2 (563) meshingly connected to the outer surface of the gear 1 (561); the lower ends of the three connecting rods (562) are fixedly connected to a gear 3 (564) meshingly connected to the inner surface of the clutch plate (533); the outer surfaces of the three connecting rods (562) are slidably connected to the downward pressing round block (543); and the outer surfaces of the three connecting rods (562) are annularly distributed with a plurality of latching grooves (565) that are compatible with the size and shape of the outer surface of the latching rod (551); The three sealing assemblies (6) comprise a circular groove (61) formed on the inner surface of the cylinder (4); the inner surfaces of the three cylinders (4) are each provided with a rotating mechanism (62); and the inner surfaces of the three circular grooves (61) are each provided with a sealing mechanism (63); The three rotating mechanisms (62) comprise a circular groove block (621) fixedly connected to the outer surface of the round rod (7); the outer surfaces of the three circular groove blocks (621) are rotatably connected to the inner surface of the cylinder (4); and the inner surfaces of the three circular groove blocks (621) are each provided with a plurality of balls (622); The three sealing mechanisms (63) include a sealing ring (631) sleeved on the outer surface of the round rod (7); the outer surfaces of the three sealing rings (631) are rotatably connected to the inner surface of the circular groove (61); and the inner cavities of the three sealing rings (631) are all annularly distributed and fixedly connected with a plurality of springs 2 (632).

2. The connection structure between a propeller blade and a pitch-changing device according to claim 1, characterized in that: The lower end of the rotating rod (522) located at the left portion is fixedly connected to a motor (525) fixedly connected to the lower portion of the inner surface of the circular cover (51); the outer surfaces of the three rotating rods (522) are all fixedly connected to transmission wheels (523); and the outer surfaces of the three transmission wheels (523) are commonly wound with a belt (524).

3. The connection structure between a propeller blade and a pitch-changing device according to claim 1, characterized in that: A pressure plate (534) is fixedly mounted on the upper ends of the three clutch plates (533), a diaphragm spring (535) is fixedly mounted on the upper ends of the three pressure plates (534), and a housing (536) is fixedly mounted on the upper ends of the three flywheels (532).

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