A double-layer annular force bearing device and loading platform for a helicopter hub center piece

Abstract

The application discloses a double-layer annular force bearing device and loading platform for a helicopter hub central part, which comprises an inner ring and an outer ring arranged concentrically, wherein the inner ring and the outer ring are both arranged as a regular polygonal annular body structure and are manufactured by pouring reinforced concrete; the outer ring is formed by surrounding the first and second force bearing frames arranged alternately; and the inner ring is formed by surrounding the third and fourth force bearing frames arranged alternately. The force bearing frames at corresponding positions of the inner ring and the outer ring are arranged in parallel. The first force bearing frame is used for bearing the pendulum force loading of the hub central part; the second force bearing frame is used for bearing the centrifugal force loading of the hub central part; the third force bearing frame is arranged in parallel with the second force bearing frame and is used for bearing the damping force of the hub central part; and the fourth force bearing frame is provided with a rectangular slot for avoiding the pendulum force loading mechanism. The application solves the problem that it is difficult to use the existing welded steel frame loading platform to realize the fatigue test loading of the hub central part of a heavy helicopter.

Description

TECHNICAL FIELD

[0001] The present application relates to, but not limited to, the technical field of helicopter hub central piece test, in particular to a double-layer annular force bearing device and loading platform for helicopter hub central piece. BACKGROUND

[0002] The hub central piece, as one of the core components of the helicopter rotor system, is a key force-bearing component on the helicopter, which bears the centrifugal force, lift, flapping force, pendulum force and damping force transmitted by the blades, and its force-bearing condition is very complex. Therefore, the fatigue life of the hub central piece directly affects the service life of the entire helicopter, and its performance directly affects the strength and flight safety of the helicopter.

[0003] The hub of the heavy helicopter is expanded from the original 5 arms to 7 arms, the elastic bearing is changed from the original single ball flexible elastic bearing to the combined elastic bearing, and the length of the blade is twice that of the 13-ton blade; so that the hub central piece of the heavy helicopter will bear greater load. Therefore, the existing ordinary welded steel frame bearing platform for conventional ball flexible hub central piece cannot meet the loading of fatigue test of heavy hub central piece of hundreds of tons. SUMMARY

[0004] The purpose of the present application is to solve the above problems, the present application provides a double-layer annular force bearing device and loading platform for helicopter hub central piece, to solve the problem that the existing ordinary welded steel frame bearing platform for conventional ball flexible hub central piece cannot be used to realize the fatigue test loading of the heavy helicopter hub central piece, because the heavy helicopter hub central piece bears greater load compared with the existing model helicopter.

[0005] The technical solution of the present application: in the first aspect, the present application provides a double-layer annular force bearing device for helicopter hub central piece, which comprises: concentrically arranged inner ring force bearing rack and outer ring force bearing rack;

[0006] Wherein, the inner ring force bearing rack and the outer ring force bearing rack are respectively manufactured by steel reinforced concrete pouring, and the inner ring force bearing rack and the outer ring force bearing rack are both set as regular polygonal ring structure, the outer ring force bearing rack is formed by surrounding the first force bearing frame 1 and the second force bearing frame 2 arranged alternately, and the inner ring force bearing rack is formed by surrounding the third force bearing frame 3 and the fourth force bearing frame 4 arranged alternately; and the force bearing frames at the corresponding positions of the inner ring force bearing rack and the outer ring force bearing rack are arranged in parallel;

[0007] The first force bearing frame 1 is used for bearing the pendulum force loading of the hub central piece, and the second force bearing frame 2 is used for bearing the centrifugal force loading of the hub central piece;

[0008] The third force bearing frame 3 of the inner circle force bearing platform is arranged in parallel with the second force bearing frame 2 of the outer circle force bearing platform, and is used for bearing the damping force of the hub central part. The fourth force bearing frame 4 is provided with a rectangular slot hole 4-1, which is used for avoiding the swing force loading mechanism.

[0009] Optionally, in the double-layer annular force bearing device for the hub central part of the helicopter as described above,

[0010] A plurality of swing parallel rail slots 1-1 with the same spacing are vertically arranged on each first force bearing frame 1 of the outer circle force bearing platform, and are used for mounting the swing force loading mechanism on the swing parallel rail slots 1-1 through fixed bolts.

[0011] Optionally, in the double-layer annular force bearing device for the hub central part of the helicopter as described above,

[0012] The swing parallel rail slots 1-1 of each first force bearing frame 1 are fixedly mounted with swing force loading supports through bolts, and the swing force loading actuators are mounted on the swing force loading supports. The swing force loading angle of the swing force loading actuators is adjusted by adjusting the position of the swing force loading supports on the swing parallel rail slots 1-1.

[0013] One end of the steel wire rope of the swing force loading mechanism is connected with the swing force loading actuator, the other end passes through the rectangular slot hole 4-1 of the corresponding position fourth force bearing frame 4, and is connected with the hub central part, so as to implement the swing force loading.

[0014] Optionally, in the double-layer annular force bearing device for the hub central part of the helicopter as described above,

[0015] A circular through hole 2-1 is arranged in the middle position of each second force bearing frame 2 of the outer circle force bearing platform. A plurality of threaded holes are uniformly distributed around each circular through hole 2-1. The centrifugal force loading mechanism passes through the circular through hole 2-1, and is fixedly connected on the second force bearing frame 2 through bolts.

[0016] The third force bearing frame 3 of the inner circle force bearing platform is arranged in parallel with the second force bearing frame 2 of the outer circle force bearing platform, and is used for bearing the damping force of the hub central part. The fourth force bearing frame 4 is provided with a rectangular slot hole 4-1, which is used for avoiding the swing force loading mechanism.

[0017] Optionally, in the double-layer annular force bearing device for the hub central part of the helicopter as described above,

[0018] The piston rod of the centrifugal force loading actuator passes through the circular through hole 2-1 of each second force bearing frame 2 from the outside, and is fixedly connected on the second force bearing frame 2 through a plurality of circumferentially distributed bolts. One end of the steel wire rope of the centrifugal force loading mechanism is connected with the centrifugal force loading actuator, the other end passes through the through hole 3-2 and is connected with the hub central part, so as to implement the centrifugal force loading.

[0019] Optionally, in the double-layer annular force bearing device for the helicopter hub central piece as described above,

[0020] A plurality of damping parallel rail grooves 3-1 with the same spacing are vertically formed on each third force bearing frame 3 of the inner circle force bearing rack, for mounting the damping force loading mechanism on the damping parallel rail grooves 3-1 through fixing bolts.

[0021] Optionally, in the double-layer annular force bearing device for the helicopter hub central piece as described above,

[0022] The damping parallel rail grooves 3-1 of each third force bearing frame 3 are fixedly mounted with damping force loading supports, and the damping force loading actuators are mounted on the damping force loading supports, and the damping force loading angle of the damping force loading actuators is adjusted by adjusting the position of the damping force loading supports on the damping parallel rail grooves 3-1.

[0023] One end of the connecting rod of the damping force loading mechanism is connected with the damping force loading actuator, and the other end is connected with the hub central piece, to implement damping force loading.

[0024] Optionally, in the double-layer annular force bearing device for the helicopter hub central piece as described above, the hub central piece for loading has 7 supporting arms,

[0025] The inner circle force bearing rack and the outer circle force bearing rack are arranged as a regular fourteen-sided annular body structure, and each has 7 first force bearing frames 1, 7 second force bearing frames 2, 7 third force bearing frames 3 and 7 fourth force bearing frames 4.

[0026] In a second aspect, the embodiments of the present application further provide a loading platform for a helicopter hub central piece, comprising:

[0027] The double-layer annular force bearing device for the helicopter hub central piece as described in any one of the above, and the horizontal loading mechanism for implementing loading on the helicopter hub central piece;

[0028] The horizontal loading mechanism comprises a centrifugal force loading mechanism, a pendulum force loading mechanism and a damping force loading mechanism.

[0029] Optionally, in the loading platform for the helicopter hub central piece as described above,

[0030] The pendulum force loading mechanism realizes different pendulum force loading angles by moving to different mounting positions in the pendulum parallel rail grooves 1-1.

[0031] The damping force loading mechanism realizes different damping force loading angles by moving to different mounting positions in the damping parallel rail grooves 3-1.

[0032] The steel wire rope of the centrifugal force loading mechanism passes through the passing hole 3-2 of the corresponding position third force bearing frame 3, and is connected with the centrifugal force loading actuator on the corresponding position second force bearing frame 2, so that the centrifugal force load loading is realized.

[0033] The embodiment of the present application provides a double-layer annular force bearing device and a loading platform for a helicopter hub central part.

[0034] Firstly, the structure of the double-layer annular force bearing device improves the connection strength, enhances the overall rigidity, and greatly improves the carrying capacity of the force bearing device, so as to meet the load loading requirements of the heavy helicopter hub central part.

[0035] Secondly, the double-layer annular force bearing device can accurately simulate the boundary conditions and load characteristics of the helicopter hub central part, fills the blank in the field of hundred-ton helicopter hub central part fatigue test device in China, and improves the strength test level of the helicopter in China.

[0036] Thirdly, the double-layer annular force bearing device can bear the hundred-ton load of the heavy helicopter hub central part fatigue test, and the test bench has high strength and non-interference three-way load.

[0037] Fourthly, the double-layer annular force bearing device can meet the centrifugal force, swing force and damper force loading of multiple arm hub central parts, and the bench structure is simple, and the strength and rigidity can meet the test loading requirements. BRIEF DESCRIPTION OF DRAWINGS

[0038] The accompanying drawings are used to further understand the technical scheme of the present application, and constitute a part of the specification, and are used to explain the technical scheme of the present application together with the embodiments of the present application, and do not constitute the limitation to the technical scheme of the present application.

[0039] Figure 1 The embodiment of the present application provides a double-layer annular force bearing device for a helicopter hub central part.

[0040] Figure 2 The embodiment of the present application provides a double-layer annular force bearing device for a helicopter hub central part. Figure 1The embodiment shown provides a top view schematic diagram of the inner ring force support stand and the outer ring force support stand in the double-layer annular force support device for the helicopter hub central part;

[0041] Figure 3 The embodiment shown provides a schematic diagram of the overall structure of the loading platform for the helicopter hub central part. Specific embodiments

[0042] To make the purpose, technical solutions and advantages of the present application clearer, the following will describe the embodiments of the present application in detail with reference to the drawings. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily without conflict.

[0043] As described above in the background, for the existing ordinary welded steel frame bearing platform of the conventional spherical flexible hub central part, since the hub central part of the heavy helicopter bears a larger load compared with the existing model helicopter, it is difficult to use the existing welded steel frame bearing platform to realize the fatigue test loading.

[0044] To solve the above problems, the present application provides a double-layer annular force support device and a loading platform for the helicopter hub central part, which can meet the load loading requirements of the hub central part of the heavy helicopter.

[0045] The present application provides several specific embodiments which can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0046] Figure 1 The embodiment shown provides a schematic diagram of the overall structure of the double-layer annular force support device for the helicopter hub central part, Figure 2 To Figure 1 The embodiment shown provides a top view schematic diagram of the inner ring force support stand and the outer ring force support stand in the double-layer annular force support device for the helicopter hub central part. Referring to Figure 1 and Figure 2 The double-layer annular force support device provided by the embodiment of the present application comprises: an inner ring force support stand and an outer ring force support stand arranged concentrically.

[0047] As Figure 1 and Figure 2 The inner ring force support stand and the outer ring force support stand are respectively manufactured in the form of reinforced concrete pouring, and the inner ring force support stand and the outer ring force support stand are both arranged as a regular polygonal annular body structure. The outer ring force support stand is formed by surrounding the first force support frame 1 and the second force support frame 2 arranged alternately, and the inner ring force support stand is formed by surrounding the third force support frame 3 and the fourth force support frame 4 arranged alternately; as Figure 2 The top view of the inner ring force support stand and the outer ring force support stand, Figure 2The inner circle bearing frame and the outer circle bearing frame are concentrically arranged. In addition, the bearing frames at the corresponding positions of the inner circle bearing frame and the outer circle bearing frame are arranged in parallel.

[0048] The first bearing frame 1 is used for bearing the shimmy force loading of the hub central part, the second bearing frame 2 is used for bearing the centrifugal force loading of the hub central part, the third bearing frame 3 of the inner circle bearing frame is arranged in parallel with the second bearing frame 2 of the outer circle bearing frame, and is used for bearing the damping force loading of the hub central part, and the fourth bearing frame 4 is provided with a rectangular slot hole 4-1, which is used for avoiding the shimmy force loading mechanism.

[0049] In one implementation manner of the embodiment of the present application, a plurality of shimmy parallel rail slots 1-1 with the same spacing are arranged on each first bearing frame 1 of the outer circle bearing frame in the vertical direction, and are used for mounting the shimmy force loading mechanism on the shimmy parallel rail slot 1-1 through a fixing bolt.

[0050] In the implementation manner, the shimmy parallel rail slot 1-1 of each first bearing frame 1 is fixedly mounted with a shimmy force loading support through a bolt, and a shimmy force loading actuator is mounted on the shimmy force loading support, and the shimmy force loading angle of the shimmy force loading actuator is adjusted by adjusting the position of the shimmy force loading support on the shimmy parallel rail slot 1-1.

[0051] In the implementation, one end of the steel wire rope in the shimmy force loading mechanism is connected with the shimmy force loading actuator, the other end passes through the rectangular slot hole 4-1 of the corresponding position fourth bearing frame 4 and is connected with the hub central part, and the shimmy force loading is implemented. Figure 1

[0052] In one implementation manner of the embodiment of the present application, a circular through hole 2-1 is arranged in the middle position of each second bearing frame 2 of the outer circle bearing frame, a plurality of threaded holes are uniformly distributed around each circular through hole 2-1, the centrifugal force loading mechanism passes through the circular through hole 2-1, and the centrifugal force loading mechanism is fixedly connected on the second bearing frame 2 through a bolt.

[0053] In the implementation manner, the third bearing frame 3 of the inner circle bearing frame is provided with an upper through hole 3-2 and a lower through hole 3-2, which are used for passing through the upper and lower steel wires of the centrifugal force loading mechanism at the corresponding position, and do not interfere with the third bearing frame 3.

[0054] In the implementation, the piston rod of the centrifugal force loading actuator passes through the circular through hole 2-1 of each second bearing frame 2 from the outside, and the centrifugal force loading actuator is fixed on the second bearing frame 2 through a plurality of circumferentially distributed bolts, one end of the steel wire rope of the centrifugal force loading mechanism is connected with the centrifugal force loading actuator, the other end passes through the through hole 3-2 and is connected with the hub central part, and the centrifugal force loading is implemented. Figure 1 ​​

[0055] In one implementation of the embodiment of the present application, a plurality of damping parallel rail grooves 3-1 with the same spacing are vertically formed on each third force bearing frame 3 of the inner circle force bearing rack, for mounting the damping force loading mechanism on the damping parallel rail grooves 3-1 through fixing bolts.

[0056] In this implementation, the damping parallel rail grooves 3-1 of each third force bearing frame 3 are fixedly mounted with damping force loading supports, and the damping force loading actuators are mounted on the damping force loading supports, and the damping force loading angle of the damping force loading actuators is adjusted by adjusting the position of the damping force loading supports on the damping parallel rail grooves 3-1.

[0057] In the specific implementation of this implementation, one end of the loading connecting rod in the damping force loading mechanism is connected with the damping force loading actuator, and the other end is connected with the hub central member, and the damping force loading is implemented. Figure 1 As shown in the figure.

[0058] In one implementation of the embodiment of the present application, considering that the load borne by the force bearing device in the fatigue test of the main hub central member of the heavy helicopter generally includes centrifugal force, pendulum force, flapping force and damping force, etc.; among them, the centrifugal force, the pendulum force and the damping force are applied to the central member through the horizontal loading mechanism, and the flapping force is applied to the central member through the vertical loading mechanism. In order to realize the coordinated loading requirements of the horizontal centrifugal force, the pendulum force and the damper force in the fatigue test of the 7-armed hub central member of the heavy helicopter, the inner and outer double-layer ring-shaped force bearing racks designed in the embodiment of the present application can meet the fatigue test requirements of the hub central member of the heavy helicopter.

[0059] Since the hub central member for loading has 7 arms, the inner circle force bearing rack and the outer circle force bearing rack are set as positive fourteen-sided ring-shaped body structures, respectively having 7 first force bearing frames 1, 7 second force bearing frames 2, 7 third force bearing frames 3 and 7 fourth force bearing frames 4.

[0060] Based on the double-layer ring-shaped force bearing device for the hub central member of the helicopter provided by the embodiment of the present application, the embodiment of the present application further provides a loading platform for the hub central member of the helicopter, Figure 3 The overall structure schematic diagram of the loading platform for the hub central member of the helicopter provided by the embodiment of the present application, the loading platform comprises:

[0061] As shown in the embodiments provided by Figure 1 and Figure 2 The double-layer ring-shaped force bearing device for the hub central member of the helicopter and the horizontal loading mechanism for loading the hub central member of the helicopter provided by the embodiment. The horizontal loading mechanism in this embodiment comprises: a centrifugal force loading mechanism, a pendulum force loading mechanism and a damping force loading mechanism.

[0062] In the embodiment of the present application, the swing force loading mechanism realizes different swing force loading angles by moving to different installation positions in the swing parallel rail slot 1-1; the damping force loading mechanism realizes different damping force loading angles by moving to different installation positions in the damping parallel rail slot 3-1; the steel wire rope of the centrifugal force loading mechanism passes through the passing hole 3-2 of the corresponding position third force bearing frame 3, and is connected with the centrifugal force loading actuator on the corresponding position second force bearing frame 2, so as to realize centrifugal force load loading.

[0063] The embodiment of the present application provides a double-layer annular force bearing device and a loading platform for a helicopter hub central part.

[0064] Firstly, the structure of the double-layer annular force bearing device improves the connection strength, enhances the overall rigidity, and greatly improves the carrying capacity of the force bearing device, so as to meet the load loading requirements of the heavy helicopter hub central part.

[0065] Secondly, the double-layer annular force bearing device can accurately simulate the boundary conditions and load characteristics of the helicopter hub central part, fills the gap in the field of hundred-ton helicopter hub central part fatigue test device in China, and improves the strength test level of helicopters in China.

[0066] Thirdly, the double-layer annular force bearing device can bear the hundred-ton load of the heavy helicopter hub central part fatigue test, and the test bench has high strength and non-interference three-way load.

[0067] Fourthly, the double-layer annular force bearing device can meet the centrifugal force, swing force and damper force loading of multiple support arm hub central parts, and the bench structure is simple, strong and rigid, and can well meet the test loading requirements.

[0068] The double-layer annular force bearing device and the loading platform for the helicopter hub central part provided by the embodiment of the present application are described below by a specific embodiment.

[0069] Embodiment

[0070] In the fatigue test of the main hub central part of a heavy helicopter, the load borne by the force bearing device generally includes centrifugal force, pendulum force, flapping force and damping force, etc. Among them, the centrifugal force, pendulum force and damping force are applied to the central part through the horizontal loading mechanism, and the flapping force is applied to the central part through the vertical loading mechanism.

[0071] To realize the coordinated loading requirement of the horizontal centrifugal force, pendulum force and damping force in the fatigue test of the central part of the 7 arm hubs of a heavy helicopter, the inner and outer double-layer annular force bearing rack designed in the embodiment of the application can meet the fatigue test requirement of the central part of the hub of a heavy helicopter.

[0072] Referring to Figures 1 to 3 The embodiment provides a loading platform for the central part of a helicopter hub, which comprises a double-layer annular force bearing device and horizontal loading mechanisms; wherein the double-layer annular force bearing device is an inner and outer double-layer annular force bearing rack structure with fourteen regular faces, each of which is divided into an angle of 25.71 degrees, and the inner and outer force bearing racks are composed of concrete, square steel and steel bars.

[0073] The outer force bearing rack of the double-layer annular force bearing device is formed by alternately surrounding the first force bearing frame 1 and the second force bearing frame 2 with different structures, and is used for applying centrifugal force and pendulum force; it has 7 arms, each of which loads centrifugal force and pendulum force; the inner force bearing rack of the double-layer annular force bearing device is formed by alternately surrounding the third force bearing frame 3 and the fourth force bearing frame 4 with different structures, and is used for applying damping force; it has 7 arms, each of which loads damping force.

[0074] As shown in Figures 1 to 3 The seven faces of the fourteen faces of the outer force bearing rack, which are arranged at intervals, are the first force bearing frames 1 with the same structure, a plurality of pendulum parallel rail grooves 1-1 with the same spacing are formed in the first force bearing frames 1 along the vertical direction, and the pendulum force loading mechanism can be installed on the pendulum parallel rail grooves 1-1 through fixed bolts. In addition, according to the loading requirement, the pendulum force loading mechanism can be moved to different installation positions on the pendulum parallel rail grooves 1-1 to realize different pendulum force loading angles.

[0075] As shown in Figures 1 to 3 The seven faces of the fourteen faces of the outer force bearing rack, which are arranged at intervals, are the second force bearing frames 2 with the same structure, a plurality of threaded holes are uniformly distributed around each circular through hole 2-1 in the middle position of the second force bearing frames 2, and the centrifugal force loading mechanism is passed through the circular through hole 2-1 and fixedly connected to the second force bearing frame 2 through bolts.

[0076] As shown in Figures 1 to 3As shown, the seven of fourteen faces of the inner circle force bearing platform are the third force bearing frame 3 with the same structure, a plurality of damping parallel rail grooves 3-1 are vertically formed on the third force bearing frame 3, and the damper force loading mechanism is installed on the damping parallel rail grooves 3-1 through fixing bolts, and the damper force loading angle can be changed according to the installation position of the damping parallel rail grooves 3-1 to realize different loading angle requirements.

[0077] Two waist-shaped through holes 3-2 are formed on the damping parallel rail grooves 3-1, which ensure that the steel wire rope is connected to the centrifugal force loading mechanism and the hub central part.

[0078] As shown, Figures 1 to 3 The other seven of fourteen faces of the inner circle force bearing platform are the fourth force bearing frame 4 with the same structure, and one rectangular slot 4-1 is formed on the fourth force bearing frame 4 to ensure that the steel wire rope is connected to the pendulum force loading mechanism and the hub central part.

[0079] Based on the above-mentioned double-layer ring-shaped force bearing device, as shown, Figure 3 Firstly, the pendulum force loading support is fixed on the pendulum parallel rail groove 1-1 through bolts, the actuator is installed on the pendulum force loading support, and the angle of the actuator is adjusted to meet the pendulum force loading angle requirement of the fatigue test. One end of the steel wire rope is connected to the pendulum force loading actuator, and the other end is connected to the hub central part through the rectangular slot hole 4-1 to implement the pendulum force loading.

[0080] Then, the piston rod of the centrifugal force loading actuator is inserted into the circular through hole 2-1 from the outside, and the centrifugal force loading actuator is fixed on the second force bearing frame 2 through a plurality of circumferentially distributed bolts, one end of the steel wire rope of the centrifugal force loading mechanism is connected to the centrifugal force loading actuator, and the other end is connected to the hub central part through the through hole 3-2 to implement the centrifugal force loading.

[0081] Finally, the damper force loading support is fixed on the damping parallel rail groove 3-1 through bolts, the actuator is installed on the damper force loading support, and the angle of the actuator is adjusted to meet the damper force loading angle requirement of the fatigue test. One end of the loading connecting rod is connected to the damper force loading actuator, and the other end is connected to the hub central part to implement the damper force loading.

[0082] In summary, the fourteen face ring-shaped force bearing device of the inner and outer double rings proposed in the embodiment of the application solves the problems of centrifugal force, pendulum force and damper force loading of the seven-armed hub central part of the heavy helicopter, and improves the universality of the force bearing frame. The strength and rigidity of the force bearing frame can effectively ensure the requirements of the hundred-ton-level large load fatigue test, and provide a basis for the fatigue life of the hub central part of the heavy helicopter.

[0083] Although the present application has been described with reference to the above embodiments, the contents are only the embodiments for facilitating the understanding of the present application, and are not intended to limit the present application. Any modification and change in the form and details of the embodiments can be made by any person skilled in the art without departing from the spirit and scope of the present application. The patent protection scope of the present application shall be subject to the scope defined by the appended claims.

Claims

1. A double ring load bearing device for a helicopter hub central piece, characterized in that, The utility model relates to a double-layer annular bearing device for helicopter hub central part, including: Concentrically arranged inner circle bearing frame and outer circle bearing frame; Wherein, the inner circle bearing frame and outer circle bearing frame are made by reinforced concrete pouring respectively, and the inner circle bearing frame and outer circle bearing frame are all arranged as positive polyhedral ring body structure, the outer circle bearing frame is formed by surrounding setting first bearing frame (1) and second bearing frame (2) alternately, the inner circle bearing frame is formed by surrounding setting third bearing frame (3) and fourth bearing frame (4) alternately, and the bearing frame of corresponding position of the inner circle bearing frame and outer circle bearing frame is arranged in parallel; The first bearing frame (1) is used for bearing the swing force loading of hub central part, and the second bearing frame (2) is used for bearing the centrifugal force loading of hub central part; The third bearing frame (3) of the inner circle bearing frame is arranged in parallel with the second bearing frame (2) of the outer circle bearing frame and is used for bearing the damping force loading of hub central part, and the fourth bearing frame (4) is provided with rectangular slot hole (4-1) and is used for avoiding swing force loading mechanism; Each first bearing frame (1) of the outer circle bearing frame is provided with a plurality of swing parallel rail slots (1-1) with same spacing along the vertical direction, and is used for installing swing force loading mechanism on the swing parallel rail slots (1-1) through fixed bolts; The swing parallel rail slots (1-1) of each first bearing frame (1) are fixedly installed with swing force loading support through bolts, and the swing force loading actuator is installed on the swing force loading support, and the swing force loading angle of the swing force loading actuator is adjusted by adjusting the position of the swing force loading support on the swing parallel rail slots (1-1); One end of the steel wire rope in the swing force loading mechanism is connected with the swing force loading actuator, the other end passes through the rectangular slot hole (4-1) of the corresponding position fourth bearing frame (4) and is connected with the hub central part, and swing force loading is implemented; Each second bearing frame (2) of the outer circle bearing frame is provided with a circular through hole (2-1) at the middle position, a plurality of threaded holes are uniformly distributed around each circular through hole (2-1), the centrifugal force loading mechanism passes through the circular through hole (2-1), and the centrifugal force loading mechanism is fixedly connected on the second bearing frame (2) through bolts; The third bearing frame (3) of the inner circle bearing frame is provided with upper and lower through holes (3-2), the upper and lower steel ropes of the centrifugal force loading mechanism pass through the through holes (3-2) without interfering with the third bearing frame (3); The piston rod of the centrifugal force loading actuator passes through the circular through hole (2-1) of each second bearing frame (2) from the outside, and the centrifugal force loading actuator is fixed on the second bearing frame (2) through a plurality of circumferentially distributed bolts, one end of the steel wire rope of the centrifugal force loading mechanism is connected with the centrifugal force loading actuator, the other end passes through the through hole (3-2) and is connected with the hub central part, and centrifugal force loading is implemented.

2. The double-layer annular bearing device for helicopter hub central part according to claim 1, wherein: A plurality of damping parallel rail slots (3-1) with same spacing are vertically arranged on each third bearing frame (3) of the inner circle bearing frame, and the damping force loading mechanism is installed on the damping parallel rail slots (3-1) through fixed bolts.

3. The double-layer annular force bearing device for the helicopter hub central piece according to claim 2, characterized in that, the damping parallel rail groove (3-1) of each third force bearing frame (3) is fixedly installed with a damping force loading support, and the damping force loading actuator is installed on the damping force loading support, and the damping force loading angle of the damping force loading actuator is adjusted by adjusting the position of the damping force loading support in the damping parallel rail groove (3-1); one end of the loading connecting rod in the damping force loading mechanism is connected with the damping force loading actuator, and the other end is connected with the hub central piece, thereby implementing the damping force loading.

4. Double annular load bearing device for the mast head of a helicopter according to any one of claims 1 to 3, characterized in that, The hub central piece for loading has 7 supporting arms, the inner ring force bearing stand and the outer ring force bearing stand are both provided as positive fourteen annular body structures.

5. A loading platform for a helicopter hub central piece, characterized in that, comprising: The double-layer annular force bearing device for the helicopter hub central piece according to any one of claims 1-4, and a horizontal loading mechanism for implementing loading on the helicopter hub central piece; wherein the horizontal loading mechanism comprises a centrifugal force loading mechanism, a pendulum force loading mechanism and a damping force loading mechanism.

6. The loading platform for the helicopter hub central piece according to claim 5, characterized in that, the pendulum force loading mechanism realizes different pendulum force loading angles by moving to different installation positions in the pendulum parallel rail groove (1-1); the damping force loading mechanism realizes different damping force loading angles by moving to different installation positions in the damping parallel rail groove (3-1); the steel wire rope of the centrifugal force loading mechanism passes through the passing hole (3-2) of the corresponding position third force bearing frame (3), and is connected with the centrifugal force loading actuator on the corresponding position second force bearing frame (2) after passing through the passing hole (3-2), thereby realizing the centrifugal force loading.

Images