A double-layer ring-shaped deployable perimeter truss capable of end self-locking

Abstract

The application discloses a double-layer annular deployable perimeter truss with a terminal self-locking function, which comprises a ring-shaped perimeter truss formed by connecting a plurality of double-layer arc-shaped scissor components and a driving mechanism for driving the ring-shaped perimeter truss to deploy or contract, wherein the connecting starting end and the connecting ending end of the ring-shaped perimeter truss are provided with self-locking mechanisms, and the double-layer arc-shaped scissor component is hinged by a first single-layer arc-shaped scissor component and a second single-layer arc-shaped scissor component. The deployable mechanism has good load capacity and rigidity performance, and can meet the application requirements of a perimeter truss of a large-scale deployable cable net antenna in space.

Description

Technical Field

[0001] This invention relates to the field of robotics mechanics, specifically to a double-layered annular deployable peripheral truss with end-capture self-locking. Background Technology

[0002] Chinese invention patent CN109659659A discloses a ring-shaped truss deployable antenna mechanism based on 3R RRP mechanism units. It comprises 2N 3R RRP mechanism units, grouped in pairs and connected by a shared support rod, a fixed node connector, and a moving node connector, forming N combined mechanism units. These N combined mechanism units are structurally identical, with adjacent units connected by a shared support rod and two fixed node connectors, collectively forming a multi-faceted ring-shaped truss mechanism. Each 3R RRP mechanism unit mainly includes two support rods, one long connecting rod, two short connecting rods, three fixed node connectors, and one moving node connector. The short connecting rods are half the length of the long connecting rods, and the support rods are more than three times the length of the short connecting rods. This invention features a simple overall structure, flexible movement, and low manufacturing cost, making it well-suited as a support mechanism for large-aperture spaceborne antennas.

[0003] The existing antenna trusses have several shortcomings: First, most lack descriptions of their drive characteristics, focusing solely on deployment performance, which is unreasonable. Drive system design is crucial for antenna design; a complex drive system leads to excessively high overall mass, hindering space transport and diminishing practical value. Second, in practical applications, antenna trusses require good rigidity. Most current trusses only consider the deployed dimensions, neglecting rigidity. Therefore, to meet the actual needs of the antenna frame, the rigidity of the spaceborne antenna truss should be designed. Third, antennas need to maintain a stable deployed state during operation, but most current trusses only describe the deployment process, lacking explanations on how to ensure stable deployment. Fourth, most current antenna trusses are designed with polygonal approximations of circles, which typically wastes more space than circular antennas. Therefore, to avoid these shortcomings, improvements are necessary. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the prior art and provide a rigid, high-ratio, end-locking, double-layered annular deployable perimeter truss.

[0005] The present invention is achieved through the following technical solution: a double-layer annular deployable peripheral truss with end self-locking, comprising an annular peripheral truss formed by connecting several double-layer arc-shaped scissor assemblies and a driving mechanism for driving the annular peripheral truss to deploy or retract. The starting and ending ends of the annular peripheral truss are provided with self-locking mechanisms. The double-layer arc-shaped scissor assemblies are formed by hinged connection of a first single-layer arc-shaped scissor assembly and a second single-layer arc-shaped scissor assembly.

[0006] Furthermore, the self-locking mechanism includes a self-locking seat and a sliding rod. The beginning end of the sliding rod slides within the self-locking seat. A transverse locking groove is formed on the side wall of the beginning end of the self-locking seat. A longitudinal locking groove is formed at the upper end of the transverse locking groove. An elastic component and a self-locking rod are sequentially arranged in the longitudinal locking groove. The self-locking rod extends and retracts within and outside the longitudinal locking groove. The end of the sliding rod and the beginning end of the self-locking seat are rotatably connected to the continuation beginning end of the annular peripheral truss, respectively. The continuation end of the annular peripheral truss is engaged within the transverse locking groove.

[0007] Furthermore, the first single-layer arc-shaped scissor lift assembly includes a first scissor bar and a second scissor bar, with the first scissor bar and the second scissor bar hinged at their middle portions. The second single-layer arc-shaped scissor lift assembly includes a third scissor bar and a fourth scissor bar, with the middle portions of the third scissor bar and the fourth scissor bar hinged together. The starting ends of the first scissor bar and the third scissor bar are respectively hinged to the ends of adjacent second scissor bars and the fourth scissor bar, and the starting ends of the second scissor bar and the fourth scissor bar are respectively hinged to the ends of adjacent first scissor bars and the third scissor bar. A plurality of connecting rods are provided between the first single-layer arc-shaped scissor lift assembly and the second single-layer arc-shaped scissor lift assembly, with the two ends of the plurality of connecting rods rotatably connected to the first single-layer arc-shaped scissor lift assembly and the second single-layer arc-shaped scissor lift assembly, respectively.

[0008] Furthermore, a first connecting rod is rotatably connected between the starting ends of the first scissor bar and the third scissor bar; a second connecting rod is rotatably connected between the ends of the first scissor bar and the third scissor bar; a third connecting rod is rotatably connected between the starting ends of the second scissor bar and the fourth scissor bar; a fourth connecting rod is rotatably connected between the middle portions of the first scissor bar and the second scissor bar and the middle portions of the third scissor bar and the fourth scissor bar; and the first connecting rod, the second connecting rod, the third connecting rod, and the fourth connecting rod constitute a common connecting component for two adjacent double-layer arc-shaped scissor bar assemblies.

[0009] Furthermore, the end of the sliding rod and the beginning of the self-locking seat are rotatably connected to the fourth connecting rod and the second connecting rod at the continuation beginning of the annular peripheral truss, respectively, and the first connecting rod at the continuation end of the annular peripheral truss is engaged in the transverse locking groove.

[0010] Furthermore, the elastic component is a return spring.

[0011] Furthermore, the outer side of the extended end of the self-locking rod is provided with a transition surface.

[0012] Furthermore, the self-locking mechanism is provided with a snap-fit ​​structure that limits the extension length of the self-locking rod.

[0013] Furthermore, the drive mechanism is mounted on the double-layer arc-shaped scissor lift assembly in the middle of the annular peripheral truss. The drive mechanism includes a drive rod, a fixed seat mounted on one end of the drive rod, and a sliding seat mounted on the other end of the drive rod. The fixed seat and the sliding seat are hinged to the beginning or end of the double-layer arc-shaped scissor lift assembly.

[0014] Furthermore, the drive mechanism also includes a first hinge seat and a second hinge seat, the first hinge seat and the second hinge seat are fixedly installed at the beginning or end of the double-layer arc-shaped scissor assembly, the fixed seat is hinged to the first hinge seat, and the sliding seat is hinged to the second hinge seat.

[0015] Compared with the prior art, the deployable antenna peripheral truss of the present invention adopts a truss structure, which gives the deployable mechanism good load-bearing capacity and stiffness performance, and can meet the application requirements of peripheral trusses for large-scale deployable cable net antennas.

[0016] The deployable antenna of this invention employs an arc-shaped scissor mechanism in its peripheral truss, resulting in a large unfolding ratio. Furthermore, in the unfolded state, it forms a circular truss, which improves the antenna's operating efficiency compared to a polygonal, near-circular annular truss. The dimensions of the peripheral truss are determined by the curvature of the arc-shaped scissor mechanism; the larger the radius of curvature of the arc-shaped scissor, the larger the size of the peripheral truss.

[0017] The deployable antenna truss of this invention has few degrees of freedom, containing only one. Through the design of the drive system, only one actuator is needed to achieve the deployment of the ring truss.

[0018] The deployable antenna peripheral truss of the present invention adopts an end self-locking mechanism. When the peripheral truss is deployed to the end contact, a self-locking mechanism is formed between the two ends, so that the peripheral truss can make full use of its stability and enhance the structural rigidity of the peripheral truss.

[0019] The deployable antenna peripheral truss of the present invention adopts a double-layer truss structure, which further enhances the structural rigidity of the peripheral truss. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the first single-layer arc-shaped scissor lift assembly of the double-layer annular deployable peripheral truss with end-locking capability of the present invention.

[0022] Figure 2 This is a side view of the first single-layer arc-shaped scissor lift assembly of the double-layer annular deployable peripheral truss with end-locking capability of the present invention.

[0023] Figure 3 This is a schematic diagram of the double-layer arc-shaped scissor lift assembly structure of the double-layer annular deployable peripheral truss with end self-locking according to the present invention.

[0024] Figure 4 This is a schematic diagram of the self-locking mechanism of the double-layer annular deployable peripheral truss with end self-locking capability of the present invention.

[0025] Figure 5 This is a schematic diagram of the ring-shaped peripheral truss deployment structure of the double-layer annular deployable peripheral truss with end self-locking of the present invention.

[0026] Figure 6 This is a schematic diagram of the self-locking and deployable annular peripheral truss structure of the double-layered annular deployable peripheral truss of the present invention.

[0027] Figure 7 for Figure 6 Enlarged schematic diagram of part A;

[0028] Figure 8 This is a schematic diagram of the self-locking and retracting structure of the annular peripheral truss of the present invention, which is a double-layered annular expandable peripheral truss with end self-locking capability.

[0029] Figure 9 This is a schematic diagram of the end-locking and retractable side structure of the double-layer annular expandable peripheral truss of the present invention.

[0030] Figure 10 This is a schematic diagram of the deployed state structure of the double-layered annular deployable peripheral truss with end self-locking of the present invention applied to a space satellite.

[0031] In the diagram: 1-Double-layer arc-shaped scissor lift assembly; 2-Annular perimeter truss; 3-Drive mechanism; 4-Self-locking mechanism; 5-First single-layer arc-shaped scissor lift assembly; 6-Second arc-shaped scissor lift assembly; 7-Self-locking seat; 8-Sliding rod; 9-Transverse locking groove; 10-Elastic component; 11-Self-locking rod; 12-First scissor lift rod; 13-Second scissor lift rod; 14-Third scissor lift rod; 15-Fourth scissor lift rod; 16-First connecting rod; 17-Second connecting rod; 18-Third connecting rod; 19-Fourth connecting rod; 20-Fifth connecting rod; 21-Drive rod; 22-Fixed seat; 23-Sliding seat; 24-First hinge seat; 25-Second hinge seat. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Antennas are a crucial component of various spacecraft, primarily used for signal transmission and reception. The dimensions of the antenna's perimeter truss directly impact its operational efficiency. Therefore, to meet practical requirements, the antenna perimeter truss needs to be relatively large in its operational state. However, during transportation, due to the limited carrying capacity of launch vehicles or space shuttles, antennas cannot be transported in a fixed, deployed posture. They must be launched into space in a compact, folded state, and then deployed via a drive mechanism. This necessitates a large fold-to-spread ratio for the antenna perimeter truss. Furthermore, achieving a large fold-to-spread ratio requires sophisticated drive system design. An overly complex drive system increases the difficulty of drive control, and excessive drive components significantly increase the overall mass of the antenna, which clearly does not meet practical requirements. Once the antenna is operational, due to the complexity of the working environment, the antenna ring truss also needs good rigidity to adapt and prevent structural deformation from affecting the antenna's stability.

[0034] Addressing the problems of existing antenna perimeter trusses, this invention focuses on antenna perimeter trusses and proposes a double-layered annular deployable perimeter truss with a large fold-out ratio, single-degree-of-freedom driving characteristics, and end-locking. The annular truss is formed by an arc-shaped scissor mechanism, and its dimensions depend on the curvature of this mechanism. Based on this, a single-degree-of-freedom driving mechanism is designed to complete the deployment of the annular truss. Furthermore, to maintain the deployed state of the antenna annular truss, an end-locking mechanism is designed. When the driving system controls the annular truss to deploy until the two ends contact, self-locking occurs, thereby enhancing rigidity. To adapt to complex operating environments, a double-layered annular truss is designed, ensuring reliable structural rigidity of the antenna and enhancing its environmental adaptability. Ultimately, a double-layered annular deployable perimeter truss with end-locking is formed.

[0035] like Figures 1 to 10 The invention presents a double-layered annular deployable peripheral truss with end-locking capability, comprising an annular peripheral truss 2 formed by connecting several double-layered arc-shaped scissor assemblies 1, and a drive mechanism 3 for driving the annular peripheral truss 2 to unfold or retract. The annular peripheral truss 2 has a self-locking mechanism 4 at both the beginning and end of the connection. The double-layered arc-shaped scissor assemblies 1 are hinged together by a first single-layered arc-shaped scissor assembly 5 and a second single-layered arc-shaped scissor assembly 6. To achieve foldability and a large unfolding ratio, arc-shaped scissor assemblies are used. Furthermore, to form the annular peripheral truss 2 during the unfolding process, the arc-shaped scissor assemblies are specially designed with an arc shape. By using spherical segmentation technology to divide the sphere, an arc-shaped scissor mechanism with an offset angle is formed. Connecting multiple sets of arc-shaped scissor mechanisms forms the annular peripheral truss 2. This annular peripheral truss 2 maintains a single degree of freedom and a large unfolding ratio while forming a circular annular truss, avoiding the use of multiple actuators and effectively reducing the mass of the annular peripheral truss 2. To achieve good rigidity in the annular peripheral truss 2, a double-layer truss design was implemented, and a self-locking mechanism 4 was incorporated at the ends of the annular peripheral truss 2. When both ends are fully extended, they self-lock, enhancing its rigidity. In antenna simulation verification, a cable net was arranged on the annular peripheral truss 2, and a membrane was laid on top. The results showed that the annular peripheral truss 2 could meet the actual requirements of the antenna. The arc-shaped scissor mechanism, when extended, forms an envelope angle θ.

[0036] The self-locking mechanism 4 includes a self-locking seat 7 and a slide bar 8. The beginning end of the slide bar 8 slides within the self-locking seat 7. A transverse locking groove 9 is provided on the side wall of the beginning end of the self-locking seat 7. A longitudinal locking groove is provided at the upper end of the transverse locking groove 9. An elastic component 10 and a self-locking rod 11 are sequentially provided in the longitudinal locking groove. The self-locking rod 11 extends and retracts within and outside the longitudinal locking groove. The end of the slide bar 8 and the beginning end of the self-locking seat 7 are rotatably connected to the continuation beginning end of the annular peripheral truss 2, respectively. The continuation end of the annular peripheral truss 2 is engaged within the transverse locking groove 9.

[0037] The first single-layer arc-shaped scissor lift assembly 5 includes a first scissor lift 12 and a second scissor lift 13, with the first scissor lift 12 and the second scissor lift 13 hinged at their middle portions. The second single-layer arc-shaped scissor lift assembly 6 includes a third scissor lift 14 and a fourth scissor lift 15, with the third scissor lift 14 and the fourth scissor lift 15 hinged at their middle portions. The starting ends of the first scissor lift 12 and the third scissor lift 14 are respectively hinged to the ends of the adjacent second scissor lift 13 and the fourth scissor lift 15, and the starting ends of the second scissor lift 13 and the fourth scissor lift 15 are respectively hinged to the ends of the adjacent first scissor lift 12 and the third scissor lift 14. A plurality of connecting rods are provided between the first single-layer arc-shaped scissor lift assembly 5 and the second single-layer arc-shaped scissor lift assembly 6, with the two ends of the plurality of connecting rods respectively rotatably connected to the first single-layer arc-shaped scissor lift assembly 5 and the second single-layer arc-shaped scissor lift assembly 6.

[0038] A first connecting rod 16 is rotatably connected between the beginning ends of the first scissor bar 12 and the third scissor bar 14. A second connecting rod 17 is rotatably connected between the ends of the first scissor bar 12 and the third scissor bar 14. A third connecting rod 18 is rotatably connected between the beginning ends of the second scissor bar 13 and the fourth scissor bar 15. A fourth connecting rod 19 is rotatably connected between the ends of the second scissor bar 13 and the fourth scissor bar 15. A fifth connecting rod 20 is rotatably connected between the middle parts of the first scissor bar 12 and the second scissor bar 13 and the middle parts of the third scissor bar 14 and the fourth scissor bar 15. The first connecting rod 16, the second connecting rod 17, the third connecting rod 18 and the fourth connecting rod 19 constitute a common connecting component for two adjacent double-layer arc-shaped scissor bar assemblies 1.

[0039] The end of the sliding rod 8 and the beginning of the self-locking seat 7 are rotatably connected to the fourth connecting rod 19 and the second connecting rod 17 at the beginning of the continuation of the annular peripheral truss 2, respectively. The first connecting rod 16 at the end of the continuation of the annular peripheral truss 2 is engaged in the transverse locking groove 9. When the annular peripheral truss 2 unfolds to both sides, the sliding rod 8 at the beginning of the continuation slides into the self-locking seat 7. When the beginning and end of the continuation of the annular peripheral truss 2 are close together, the first connecting rod 16 at the end of the continuation presses against the protruding end of the self-locking rod 11. When the first connecting rod 16 enters the transverse locking groove 9, the self-locking rod 11 slides upward due to the action of the elastic component 10. When the first connecting rod 16 enters the transverse locking groove 9, the self-locking rod 11 slides downward due to the action of the elastic component 10, thus forming a self-lock.

[0040] The elastic component 10 is a return spring.

[0041] The outer side of the extended end of the self-locking rod 11 is provided with a transition surface to facilitate the entry of the first connecting rod 16 into the transverse locking groove 9.

[0042] The self-locking mechanism 4 is equipped with a snap-fit ​​structure that limits the extension length of the self-locking rod 11.

[0043] The drive mechanism 3 is mounted on the double-layer arc-shaped scissor lift assembly 1 in the middle of the annular peripheral truss 2. The drive mechanism 3 includes a drive rod 21, a fixed seat 22 mounted on one end of the drive rod 21, and a sliding seat 23 mounted on the other end of the drive rod 21. The fixed seat 22 and the sliding seat 23 are hinged to the beginning or end of the double-layer arc-shaped scissor lift assembly 1. When the sliding seat 23 moves downward, the beginning and end of the annular peripheral truss 2 slowly unfold to both sides. When fully unfolded, the beginning and end of the annular peripheral truss 2 are self-locked by the self-locking mechanism 4.

[0044] The drive mechanism 3 also includes a first hinge seat 24 and a second hinge seat 25. The first hinge seat 24 and the second hinge seat 25 are fixedly installed at the beginning or end of the double-layer arc-shaped scissor assembly 1. The fixed seat 22 is hinged to the first hinge seat 24, and the sliding seat 23 is hinged to the second hinge seat 25.

[0045] The large-scale deployable spatial annular truss is in a retracted state during transportation. When it enters the service space environment and unfolds, the moving parts can be driven by simple and reliable actuators such as servo motors or lead screws. Under the action of driving force, the large-scale deployable spatial annular truss slowly unfolds. When the ends make contact, the self-locking mechanism 4 forms a self-lock, fixing the peripheral truss. Overall, the large-scale deployable spatial annular truss has a large unfolding ratio and excellent single-degree-of-freedom driving characteristics. The arc-shaped scissor mechanism makes it form a circular annular truss. The self-locking mechanism 4 makes the antenna stable and reliable in operation, reduces the influence of prestress on the truss, and strengthens the rigidity of the annular truss. The double-layer annular truss ensures the rigidity performance requirements required for on-orbit operation.

[0046] This invention relates to a large-scale deployable peripheral truss for a spatial ring, which has advantages such as high strength, high structural reliability, few degrees of freedom, and simple drive system. It can be widely used in spaceborne large-scale deployable peripheral truss cable net antennas.

[0047] To achieve a large unfolding ratio for a large-scale spatial ring-shaped truss, this invention employs an arc-shaped scissor mechanism. The scissor mechanism features modular composition, strong telescopic performance, good mechanical properties, simple structure, and high rigidity. It falls under the category of unfoldable mechanisms, has a relatively simple driving process, and high structural reliability, making it suitable for forming spatial unfoldable mechanisms with a large unfolding ratio.

[0048] To achieve the single-degree-of-freedom drive characteristics of a large-scale, deployable spatial annular truss, the trusses on both sides can be deployed simultaneously through the single-degree-of-freedom motion of the drive mechanism. This single-degree-of-freedom drive method effectively reduces the design complexity of the control system for the peripheral truss.

[0049] To achieve excellent stiffness in a large-scale, deployable spatial annular truss, this invention employs a truss-type mechanism, an end-locking mechanism 4, and a double-layer truss. The truss-type structure provides the deployable mechanism with good stiffness and load-bearing capacity; the end-locking mechanism 4 transforms the mechanism from a movable truss structure into a zero-degree-of-freedom truss structure, significantly improving the stiffness of the large-scale, deployable spatial annular truss; and the double-layer truss further increases the stiffness of the annular truss. This is crucial for maintaining the surface accuracy of the cable-net antenna.

[0050] To improve the antenna's efficiency by creating a large-scale, deployable ring-shaped truss, the arc-shaped scissor mechanism is connected in series to form a circular ring truss that meets the actual requirements.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A double-layered annular deployable perimeter truss with end-locking capability, characterized in that: It includes a ring-shaped peripheral truss formed by connecting several double-layer arc-shaped scissor assemblies and a driving mechanism for driving the ring-shaped peripheral truss to expand or retract. The starting and ending ends of the ring-shaped peripheral truss are provided with self-locking mechanisms. The double-layer arc-shaped scissor assemblies are hinged together by a first single-layer arc-shaped scissor assembly and a second single-layer arc-shaped scissor assembly. The self-locking mechanism includes a self-locking seat and a sliding rod. The beginning end of the sliding rod slides within the self-locking seat. A transverse locking groove is provided on the side wall of the beginning end of the self-locking seat. A longitudinal locking groove is provided at the upper end of the transverse locking groove. An elastic component and a self-locking rod are sequentially arranged in the longitudinal locking groove. The self-locking rod extends and retracts within and outside the longitudinal locking groove. The end of the sliding rod and the beginning end of the self-locking seat are rotatably connected to the continuation beginning end of the annular peripheral truss, respectively. The continuation end of the annular peripheral truss is engaged within the transverse locking groove. The first single-layer arc-shaped scissor lift assembly includes a first scissor bar and a second scissor bar, with the first scissor bar and the second scissor bar hinged at their middle portions. The second single-layer arc-shaped scissor lift assembly includes a third scissor bar and a fourth scissor bar, with the third scissor bar and the fourth scissor bar hinged at their middle portions. The starting ends of the first scissor bar and the third scissor bar are respectively hinged to the ends of adjacent second scissor bars and the fourth scissor bar, and the starting ends of the second scissor bar and the fourth scissor bar are respectively hinged to the ends of adjacent first scissor bars and the third scissor bar. A plurality of connecting rods are provided between the first single-layer arc-shaped scissor lift assembly and the second single-layer arc-shaped scissor lift assembly, with the two ends of the plurality of connecting rods rotatably connected to the first single-layer arc-shaped scissor lift assembly and the second single-layer arc-shaped scissor lift assembly, respectively.

2. The end-locking, double-layered, annular, deployable perimeter truss according to claim 1, characterized in that: A first connecting rod is rotatably connected between the starting ends of the first scissor bar and the third scissor bar; a second connecting rod is rotatably connected between the ends of the first scissor bar and the third scissor bar; a third connecting rod is rotatably connected between the starting ends of the second scissor bar and the fourth scissor bar; a fourth connecting rod is rotatably connected between the middle portions of the first scissor bar and the second scissor bar and the middle portions of the third scissor bar and the fourth scissor bar; the first connecting rod, the second connecting rod, the third connecting rod, and the fourth connecting rod constitute a common connecting component for two adjacent double-layer arc-shaped scissor bar assemblies.

3. The end-locking, double-layered, annular, deployable perimeter truss according to claim 2, characterized in that: The end of the slide bar and the beginning of the self-locking seat are respectively rotatably connected to the fourth connecting rod and the second connecting rod at the continuation beginning of the annular peripheral truss, and the first connecting rod at the continuation end of the annular peripheral truss is engaged in the transverse locking groove.

4. The end-locking, double-layered, annular, deployable perimeter truss according to claim 1, characterized in that: The elastic component is a return spring.

5. The end-locking, double-layered, annular, deployable perimeter truss according to claim 1, characterized in that: The outer side of the extended end of the self-locking rod is provided with a transition surface.

6. The end-locking, double-layered, annular, deployable perimeter truss according to claim 1, characterized in that: The self-locking mechanism is provided with a snap-fit ​​structure that limits the extension length of the self-locking rod.

7. The end-locking, double-layered, annular, deployable perimeter truss according to claim 1, characterized in that: The drive mechanism is mounted on the double-layer arc-shaped scissor lift assembly in the middle of the annular peripheral truss. The drive mechanism includes a drive rod, a fixed seat mounted on one end of the drive rod, and a sliding seat mounted on the other end of the drive rod. The fixed seat and the sliding seat are hinged to the beginning or end of the double-layer arc-shaped scissor lift assembly.

8. The end-locking, double-layered, annular, deployable perimeter truss according to claim 7, characterized in that: The drive mechanism further includes a first hinge seat and a second hinge seat, which are fixedly installed at the beginning or end of the double-layer arc-shaped scissor assembly. The fixed seat is hinged to the first hinge seat, and the sliding seat is hinged to the second hinge seat.

Images