Rotor blade folding and locking drive device

Abstract

This invention discloses a rotor blade folding and locking drive device, relating to the field of mechanical rotor technology. The invention is achieved through the following technical solution: The main function of the locking drive device is that when the drive program is started, the axial lock pin extends to achieve axial locking, restricting the movement of a specific structure. After axial locking is completed, the drive piston rod moves the specific structure. When the reverse drive program is started, the axial lock pin retracts to achieve axial unlocking, releasing the movement of the specific structure 1. After axial unlocking is completed, the drive piston rod moves the specific structure. Furthermore, during the axial locking and unlocking process, a microswitch is triggered by the lock pin to provide a signal indicating whether the axial lock is unlocked. This signal can work together with the signal switches of other components to support the normal operation of the system. Through a reasonable structural layout, the axial locking mechanism and the drive actuator are effectively integrated into one unit. It features sequential locking and driving actions with simple control logic. It enables rapid rotor folding.

Description

Technical Field

[0001] This invention relates to the field of mechanical rotor technology, and in particular to a helicopter rotor system that performs a helicopter rotor blade folding and locking drive device for restricting the degrees of freedom of movement of the flapping arm along the damping and flapping direction, while performing the functions of folding and unfolding the rotor blades. Background Technology

[0002] Folding helicopters are finding increasingly wider applications in the aviation field, and the demand is becoming more prominent. Currently, countries around the world are actively exploring and striving to find ways to improve the folding efficiency of helicopter rotor blades. Helicopters are mainly composed of three core systems: rotor, control, and engine. Among them, whether the rotor blades have a folding function, and the reliability of the blade folding operation, greatly affects the safety of the rotor system. The helicopter rotor folding system divides the rotor hub into two parts. One part is fixedly connected to the rotor shaft, and the other part can rotate around the rotor shaft axis under the drive of the actuator. The rotor hub support arm is the part where the various blades are installed and joined. It is located at the end of the rotor and is mostly conical or frustum-shaped. It fits against the stern shaft, and a keyway is opened at the rear of the fit, with a key inserted, so that the stern shaft drives the rotor to rotate. Each part of the rotor hub connects to two blades. These two parts can rotate relative to each other, reducing the angle between the blade pitch axes to within 45 degrees. The rotor shaft can be positioned at a specific azimuth angle, ensuring that the angle bisector between the two blades (less than 45 degrees) coincides with the helicopter's heading. This significantly reduces the complexity of the four-bladed rotor folding system and enables rapid rotor folding. The blade pitch locking mechanism typically consists of an upper pitch locking mechanism and a lower pitch locking mechanism. During rotor folding, after rotor positioning and blade yaw positioning, the locking pins of the upper and lower pitch locking mechanisms extend and insert into their corresponding locking holes, jointly locking the blade pitch freedom. This ensures that the rotor hub support maintains a certain pitch angle during blade folding, preventing interference between the blades during and after folding, or interference with the corresponding rotor hub support. In addition to bearing the folding load of its own blade, the upper pitch locking pin of the helicopter rotor folding mechanism also bears some of the folding load of other blades. Improper load transfer in the upper pitch locking pin can easily lead to breakage. After the rotor is folded, the flapping load of the blades after folding is transmitted to the corresponding upper pitch locking pin through the lower limit moving ring, resulting in an additional increase in the load on the upper pitch locking pin. The actual working load of the locking pin exceeds its design strength, which is the main cause of the locking pin breakage. According to the changes in the installation angle of each blade after rotor folding, the upper pitch locking pins corresponding to blades #3 and #4 experience more severe wind loads after folding, with the upper pitch locking pin corresponding to blade #4 experiencing the most severe wind load. Other factors that can cause the upper pitch locking mechanism pin to break include the brittleness of the locking pin material. However, due to the working principle of the limiting ring and the large gap between the locking pin and the locking hole bushing, an unreasonable force transmission path of the variable pitch locking pin is formed. After the blades are folded into place, the load in the flapping direction of blades #1 and #6 after folding is transmitted to the variable pitch locking pins corresponding to blades #3 and #4 through the lower limiting ring, which increases the load on the variable pitch locking pins corresponding to blades #3 and #4. This is undoubtedly one of the main reasons for the failure of the locking pin of the upper variable pitch locking mechanism.

[0003] In the past, lockable drive devices with the ability to restrict the sequential operation of the pitch locking pin 1 and the piston cylinder 6 were usually designed with separate locking and drive devices. The biggest drawbacks of this design were that it occupied space, increased hydraulic lines and control logic, reduced reliability, and increased maintenance difficulty. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies and the requirements of lockable drive devices in the aerospace field for small installation size, light weight, strong environmental adaptability, stable performance, and good weather resistance. It provides a lockable drive device that is compact in structure, occupies little space, has high reliability, simple control logic, features sequential locking and driving actions, adapts to drastic temperature changes, and has a wide range of applications.

[0005] The technical solution adopted by this invention to solve its technical problem is: a rotor blade folding and locking drive device, comprising: a rotor hub actuator 4 connected between two rotor hubs to control rotor folding, a locking end cap 3 screwed into the flange end hole of the rotor hub actuator 4, a locking hole bushing 2 sealed by the inner annular surface of the rotor hub actuator 4, and a hydraulic diverter actuator 5, and a piston telescopic rod 8 that moves along the piston cylinder 6 cavity to perform telescopic movement in conjunction with the rotor hub, characterized in that: the locking hole bushing 2 seals the variable pitch locking pin 1 ring in the cavity of the locking cylinder 14 through the inner stepped cylinder, the cylinder of the hydraulic diverter actuator 5 seals the back end diverter ring of the variable pitch locking pin 1 ring to form a hydraulic cavity 13, and the outer circular stepped ring of the hydraulic diverter actuator 5 forms a generatrix diverter ring that radially connects to the radial diverter ring hole 10 of the back end diverter ring of the variable pitch locking pin 1. The busbar diversion ring groove 11 is connected to the hydraulic chamber 13 via the radial through hole 12. The diversion ring groove 11 is connected to the hydraulic channel 9 of the pressure supply port A via the hydraulic channel at the flange end of the actuator cylinder, and is connected to the radial oil port B of the piston cylinder ring cavity at the head and tail of the actuator cylinder and the oil inlet C of the oil tank, forming an oil circulation loop connecting the back cavity of the pitch locking pin 1 and the piston cylinder cavity, thereby constituting a folding locking drive device. When the drive is started, the pitch locking pin 1 extends to achieve axial locking; when the reverse drive is started, the pitch locking pin 1 retracts to achieve axial unlocking. During the locking and unlocking process of the axial lock, the pitch locking pin 1 triggers a micro switch to give a signal indicating whether the axial lock is unlocked. Together with the signal switches of other components, it ensures the normal operation of locking the blade pitch degree of freedom.

[0006] Compared with the prior art, the present invention has the following advantages:

[0007] This invention employs a hub actuator 4 connected between the two rotor hubs to control rotor folding, a locking end cap 3 screwed into the flange end hole of the hub actuator 4, a locking hole bushing 2 sealed by the inner annular ring of the hub actuator 4, a hydraulic diverter actuator 5, a piston telescopic rod 8 that moves along the piston cylinder 6 cavity in conjunction with the rotor hub, and a hydraulic diverter actuator 5 that seals the pitch locking pin 1 in the locking cylinder 14 cavity through an inner stepped cylinder. The hydraulic diverter actuator 5 seals the back end diverter ring of the pitch locking pin 1, forming a hydraulic chamber 13. Through a reasonable structural layout, the axial locking mechanism and the drive actuator cylinder are effectively integrated into one unit, resulting in a compact structure and reduced load on the pitch locking pin. Compared to previous designs that separately designed the locking device and the drive device, this design occupies less space.

[0008] This invention employs a hydraulic diversion actuator 5 with an outer stepped ring forming a radially connected radial diversion ring hole 10 in the diversion ring at the back end of the variable pitch locking pin 1. The radial diversion ring groove 11 connects to the aforementioned hydraulic cavity 13 via a radial through hole 12. The diversion ring groove 11 connects to the hydraulic channel 9 at the pressure supply port A via the hydraulic channel at the flange end of the actuator cylinder, and is connected to the radial oil port B of the piston cylinder ring cavity at the head and tail of the actuator cylinder, and the oil inlet C of the oil tank, forming an oil circulation loop connecting the back cavity of the variable pitch locking pin 1 and the piston cylinder cavity. This constitutes a folding locking drive device. It features sequential locking and driving actions, high reliability, and simple control logic. Furthermore, it enables rapid rotor folding and is easy to operate. Attached Figure Description

[0009] Figure 1 This is a cross-sectional view along line AA of the rotor blade folding and locking drive device of the present invention;

[0010] Figure 2 yes Figure 1 The main view;

[0011] Figure 3 yes Figure 1 A partially enlarged cross-sectional view of the shunt ring assembly 5;

[0012] Figure 4 This is a schematic diagram of an existing rotor four-bladed rotor hub actuator;

[0013] In the diagram: 1 Pitch-changing locking pin, 2 Lock hole bushing, 3 Lock end cap, 4 Paddle hub actuator, 5 Hydraulic diverter driver, 6 Piston cylinder, 7 Fixed-distance bushing, 8 Piston telescopic rod, 9 Hydraulic channel A for pressurized oil supply, 10 Radial diverter ring hole, 11 Busbar diverter ring groove, 12 Radial through hole, 13 Hydraulic chamber, 14 Lock cylinder.

[0014] The present invention will be further described below with reference to the accompanying drawings, but this does not limit the invention to the scope of the described embodiments. All these concepts should be considered as part of the disclosure of this technology and the scope of protection of this invention. Detailed Implementation

[0015] See Figure 1 , Figure 2 In the illustrative preferred embodiment described below, a rotor blade folding and locking drive device includes: a rotor hub actuator 4 connected between two rotor hubs to control rotor folding; a locking end cap 3 screwed into the flange end hole of the rotor hub actuator 4; a locking hole bushing 2 sealed by the inner annular ring of the rotor hub actuator 4; a hydraulic diverter actuator 5; and a piston telescopic rod 8 that moves along the piston cylinder 6 cavity in conjunction with the rotor hub to extend and retract. The locking hole bushing 2 seals the variable pitch locking pin 1 ring in the cavity of the locking cylinder 14 through an inner stepped cylinder. The cylinder of the hydraulic diverter actuator 5 seals the variable pitch locking pin 1 ring with a back-end diverter ring, forming a hydraulic cavity 13. The outer stepped ring of the hydraulic diverter actuator 5 forms a generatrix diverter ring groove 11 that radially communicates with the radial diverter ring hole 10 of the back-end diverter ring of the variable pitch locking pin 1. The busbar diversion annular groove 11 is connected to the aforementioned hydraulic chamber 13 through the radial through hole 12. The diversion annular groove 11 is connected to the hydraulic channel 9 of the pressure supply port A through the hydraulic channel at the flange end of the actuator cylinder, and is connected to the radial oil port B of the piston cylinder annular cavity at the head and tail of the actuator cylinder and the oil inlet C of the oil tank, forming an oil circulation loop connecting the back cavity of the pitch locking pin 1 and the piston cylinder cavity, thereby constituting a folding locking drive device. When the drive is started, the pitch locking pin 1 extends to achieve axial locking; when the reverse drive is started, the pitch locking pin 1 retracts to achieve axial unlocking. During the locking and unlocking process of the axial lock, the pitch locking pin 1 triggers a micro switch to give a signal indicating whether the axial lock is unlocked. Together with the signal switches of other components, it ensures the normal operation of locking the blade pitch degree of freedom.

[0016] The annular cavity, the annular back cavity, the back end of the variable pitch locking pin 1, the hydraulic annular cavity and piston cylinder cavity of the piston cylinder 6, the blockage of the hollow channel ring seal of the variable pitch locking pin 1, the sequence valve, the left annular groove of the hydraulic diverter 5, the specific structure 2, and the oil through hole on the left side of the hydraulic diverter 5.

[0017] The oil circulation circuit includes: a hydraulic channel 9 with a pressure supply port A directly connected to the busbar diversion ring groove 11, a radial oil port B that is always connected to the piston cylinder cavity, and an oil inlet C connected to the oil tank.

[0018] The back end of the variable pitch locking pin 1 divides the inner cavity of the hydraulic splitter actuator 5 into a hydraulic chamber 13 and an annular chamber connected to the oil inlet C. The oil inlet C is connected to the left annular groove of the hydraulic splitter actuator 5 through a pipe on the hub actuator 4, and is connected to the annular back cavity between the back end of the locking bushing 2 and the bottom end of the ring cover of the variable pitch locking pin 1 through a through hole on the step at the end of the hydraulic splitter actuator 5. The tail end of the hydraulic splitter actuator 5 is coaxially coupled to the piston cylinder 6, which is fitted with a spacer bushing 7 to form a hydraulic annular cavity connected to the radial oil port B.

[0019] The piston cylinder 6 uses a stepped end hole to screw a conical ring and an arc-shaped collar to constrain the tail end of the piston telescopic rod 8 between the conical step inside the cylinder and the piston end cap. Furthermore, the stepped end cap hole, through a locking collar, constrains the truncated cone of the piston telescopic rod 8, limiting its axial freedom within the piston cylinder 6. Under the action of oil in the oil chambers on both sides of the axial direction, the piston telescopic rod 8 achieves linear reciprocating motion. Different lengths of piston telescopic rods 8 can meet different driving requirements.

[0020] The oil enters the busbar diversion ring groove 11 from the hydraulic channel 9 of the pressure supply port A through the hydraulic channel at the flange end of the actuator cylinder, and enters the blocking channel of the hollow channel ring seal of the variable pitch locking pin 1 through the radial diversion ring hole 10. The blocking cooperates with the hydraulic diversion driver 5 to drive the variable pitch locking pin 1 to make a linear extension and retraction movement in the lock cylinder cavity, thereby realizing the locking or unlocking of the variable pitch locking pin 1.

[0021] During the locking motion of the pitch locking pin 1, the drive program is activated, and the oil inlet C is connected to the left annular groove of the hydraulic diversion drive 5 through the pipe on the hub actuator 4, and is connected to the circulating back cavity through the pitch locking pin 1. In conjunction with the hydraulic cavity 13, the pitch locking pin 1 is driven to move from the right limit to the left limit. The busbar diversion annular groove 11 is connected to the radial diversion annular hole 10, which pushes the pitch locking pin 1 in the lock cylinder 14 to move linearly to the left until it contacts the switch trigger position of the lock hole bushing 2, thus completing the axial locking, realizing the locking of the blade pitch degree of freedom, and giving a locking signal.

[0022] During the unlocking motion of the variable pitch locking pin 1, the reverse drive program is initiated. Radial port B connects to the oil tank, and inlet C supplies pressure. Hydraulic oil enters the annular groove on the left side of the hydraulic diverter 5 from inlet C, and then enters the locking hole bushing 2 and the annular back cavity between the bottom end of the variable pitch locking pin 1's ring cover through the small hole on the left side. This drives the variable pitch locking pin 1 to move to the right until it contacts the oil distribution channel of the hydraulic diverter 5, completing the axial unlocking and giving an unlocking signal. After receiving the unlocking signal, the folding drive system supplies pressure to radial port B. Oil enters the hydraulic annular cavity and piston cylinder cavity of piston cylinder 6 through radial port B, pushing piston cylinder 6 and piston telescopic rod 8 to move to the left, realizing the reverse drive of the specific structure. At the same time, the radial diverter ring 10 on the outer circle of the variable pitch locking pin 1 connects to the busbar diverter ring groove 11 and enters the hydraulic cavity 13 between the hydraulic diverter 5 and piston cylinder 6, pushing piston cylinder 6 and piston telescopic rod 8 to move to the right, realizing the drive of the folding specific structure 2.

[0023] The variable pitch locking pin 1 integrates sequence valve function, locking function and signal output function in the locked position. The hydraulic folding system generates the hydraulic folding function. The oil enters the busbar diversion ring 11 from the hydraulic channel of the pressure supply port A. The hydraulic diversion is blocked by the variable pitch locking pin 1. The oil enters the hydraulic chamber 13 only through the diversion hole 12 on the right side of the hydraulic diversion driver 5, pushing the variable pitch locking pin 1 to move to the left until it contacts the switch trigger position of the lock hole bushing 2. This completes the axial locking of the specific structure 1 that restricts the swinging, realizes the locking function, gives the locking signal, and realizes the signal output function. At the same time, the radial diversion ring 10 channel and the diversion hole 12 hydraulically divert the oil, so that the oil can flow into the next stage through the radial diversion ring hole 10, realizing the sequence valve function of the locking and folding positions.

[0024] The hydraulic diversion actuator 5, which is installed and positioned on the lock hole bushing 2 and the outer cylinder end cover 3, is a fixed component that limits the movement limits of the variable pitch locking pin 1 and the piston cylinder 6.

[0025] The hydraulic diversion driver 5 has an oil through hole on the left and a diversion hole 12 on the right, which are respectively connected to the circulating back cavity and the hydraulic cavity 13. The right diversion hole 12 is used to push the variable pitch locking pin 1 to the left until it is locked. The left through hole is used to push the variable pitch locking pin 1 to the right to unlock. When the variable pitch locking pin 1 moves to the left limit, it is connected to the busbar diversion ring groove through the radial diversion ring hole 10 in the middle of the variable pitch locking pin 1.

[0026] After the rotor folding procedure is initiated and the upper and lower folding locks are unlocked, the variable pitch locking pin 1 extends axially to achieve axial locking, restricting the degree of freedom of movement of the swing arm along the swing and flapping directions, so that the elastic bearing does not bear radial load during the blade folding process, thus unloading the elastic bearing and completing the axial locking.

[0027] After axial locking is completed, the blade drive piston drives the connecting rod to drive the sector gear to rotate. The sector gear drives the folding joint and blades to fold the blades. After the rotor deployment procedure is initiated, the blade drive piston of the helicopter blade folding and locking drive device first drives the connecting rod to drive the sector gear to rotate. The sector gear drives the folding joint and blades to deploy the blades. Once the blades are fully deployed, the upper and lower folding locks are locked. Finally, the pitch locking pin 1 retracts, achieving axial unlocking and restoring the swing arm's freedom of movement along the oscillation and swing directions. In addition, during the locking and unlocking process of the pitch locking pin 1, a microswitch is triggered by the pin to provide a signal indicating whether the axial lock is unlocked. Together with the microswitches of other folding systems, this provides information to ensure helicopter flight safety.

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

Claims

1. A rotor blade folding and latching drive apparatus comprising: The invention relates to a folding rotor locking drive device, which comprises a hub actuator (4) connected between two blades of a rotor hub to control the folding of the rotor, a lock hole end cover (3) screwed in the flange end hole of the hub actuator (4), a lock hole bushing (2) ring-sealed by the inner ring surface of the hub actuator (4), and a hydraulic shunt driver (5). The piston telescopic rod (8) is connected to the piston cylinder (6) to realize the telescopic movement of the hub. The lock hole bushing (2) is ring-sealed in the cavity of the lock cylinder (14) by the inner step cylinder, and the hydraulic shunt driver (5) is ring-sealed with the back-end shunt ring of the variable-pitch lock pin (1) to form a hydraulic cavity (13). The outer circular step ring of the hydraulic shunt driver (5) forms a bus shunt ring groove (11) which is connected to the radial shunt ring hole (10) of the back-end shunt ring of the variable-pitch lock pin (1). The bus shunt ring groove (11) is connected to the above-mentioned hydraulic cavity (13) through the radial through hole (12), and is connected to the oil supply port A hydraulic channel (9) through the actuator flange end hydraulic channel, and is connected to the radial oil port B of the piston cylinder ring cavity and the oil inlet port C of the oil tank, thereby forming an oil circulation loop connected to the back cavity of the variable-pitch lock pin (1) and the piston cylinder cavity, and further forming the folding locking drive device. When the driving program is started, the variable-pitch lock pin (1) is extended to realize the axial locking. When the reverse driving program is started, the variable-pitch lock pin (1) is retracted to realize the axial unlocking. During the axial locking and unlocking process, the micro switch is triggered by the variable-pitch lock pin (1) to give a signal of whether the axial unlocking is realized. Together with the signal switches of other components, the normal operation of the variable-pitch locking freedom of the blades is realized.

2. The rotor blade folding and locking drive apparatus as claimed in claim 1, characterized in that: The oil circulation loop comprises the oil supply port A hydraulic channel (9) directly connected to the bus shunt ring groove (11), the radial oil port B always connected to the piston cylinder cavity, and the oil inlet port C connected to the oil tank.

3. The rotor blade folding and locking drive apparatus as claimed in claim 1, characterized in that: The back-end shunt ring of the variable-pitch lock pin (1) divides the inner cavity of the hydraulic shunt driver (5) into a hydraulic cavity (13) and a ring flow cavity connected to the oil inlet port C.

4. The rotor blade folding and locking drive apparatus as claimed in claim 3, characterized in that: The oil inlet port C is connected to the left ring groove of the hydraulic shunt driver (5) through the pipeline on the hub actuator (4), and is connected to the ring flow back cavity between the back end of the lock hole bushing (2) and the bottom end of the ring cover of the variable-pitch lock pin (1) through the through hole on the end step of the hydraulic shunt driver (5). The tail part of the hydraulic shunt driver (5) is coaxially coupled with the piston cylinder (6), and the piston cylinder (6) is assembled with a constant distance bushing (7) to form a hydraulic ring cavity connected to the radial oil port B.

5. The rotor blade folding and locking drive apparatus as claimed in claim 4, characterized in that: The tail end of the piston telescopic rod (8) is screwed with a conical ring and a circular arc sleeve ring in the conical step between the cylinder body and the piston end cover through the end step hole of the piston cylinder (6), and the step hole of the piston end cover is constrained by the locking sleeve ring to restrict the axial freedom of the piston telescopic rod (8) in the piston cylinder (6). The piston telescopic rod (8) realizes linear reciprocating motion under the action of oil in the oil cavities on both axial sides. Different lengths of the piston telescopic rod (8) can realize different driving requirements.

6. The rotor blade folding and locking drive apparatus as claimed in claim 1, characterized in that: Oil liquid from the pressure oil supply port A hydraulic channel (9) through the cylinder flange end hydraulic channel into the bus shunt ring groove (11), through the radial shunt ring hole (10) into the variable distance lock pin (1) hollow passage ring seal block channel, with hydraulic shunt drive (5) drive variable distance lock pin (1) in the lock cylinder cavity telescopic linear motion, realize variable distance lock pin (1) locking or unlocking.

7. The rotor blade folding and locking drive apparatus as claimed in claim 1, characterized in that: In the locking movement of variable distance lock pin (1), start the drive program, inlet C through the hub actuator (4) on the pipeline connected to the left side of the ring groove of hydraulic shunt drive (5), and through the variable distance lock pin (1) connected to the ring flow back cavity, cooperate with the hydraulic cavity (13) to drive the variable distance lock pin (1) from the right limit to the left limit, the bus shunt ring groove (11) is connected with the radial shunt ring hole (10), which pushes the variable distance lock pin (1) in the lock cylinder (14) to move linearly to the left side until it contacts with the switch trigger position of the lock hole bushing (2), completes the axial locking, realizes the locking of the variable pitch of the blade, and gives the locking signal.

8. The rotor blade folding and locking drive apparatus as claimed in claim 1, characterized in that: In the unlocking movement of variable distance lock pin (1), start the reverse drive program, radial oil port B is connected to the oil tank, inlet C is supplied with pressure, hydraulic oil liquid enters the ring groove on the left side of hydraulic shunt drive (5) from inlet C, and then enters the lock hole bushing (2) and ring flow back cavity between the bottom end of variable distance lock pin (1) ring cover through the left side small hole, drives variable distance lock pin (1) to move to the right side until it contacts with the oil flow channel connection position of hydraulic shunt drive (5), completes the axial unlocking, and gives the unlocking signal.

9. The rotor blade folding and locking drive apparatus as claimed in claim 1, characterized in that: After receiving the unlocking signal, the folding drive system is supplied with pressure by radial oil port B, and the oil liquid enters the hydraulic ring cavity and piston cylinder cavity of piston cylinder (6) through radial oil port B, pushes piston cylinder (6) to drive piston telescopic rod (8) to move to the left side, at the same time, the radial shunt ring hole (10) on the outer circle of variable distance lock pin (1) is connected with bus shunt ring groove (11), enters the hydraulic cavity (13) between hydraulic shunt drive (5) and piston cylinder (6), and pushes piston cylinder (6) to drive piston telescopic rod (8) to move to the right side.

10. The rotor blade folding and locking drive apparatus as claimed in claim 1, characterized in that: The sequence valve function, locking function and signal output function integrated by variable distance lock pin (1) in the locking position are generated by the hydraulic folding system, oil liquid enters bus shunt ring groove (11) from the pressure oil supply port A hydraulic channel, hydraulic shunt is blocked by variable distance lock pin (1), oil liquid only enters hydraulic cavity (13) through the radial hole (12) on the right side of hydraulic shunt drive (5), pushes variable distance lock pin (1) to move to the left side until it contacts with the switch trigger position of lock hole bushing (2), realizes the locking function, gives the locking signal, realizes the signal output function, at the same time, the radial shunt ring hole (10) channel and the radial hole (12) hydraulic shunt, oil liquid can flow into the next link through the radial shunt ring hole (10), realizes the sequence valve function of locking and folding position.

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