Single-degree-of-freedom conical axial and radial synchronous unfolding and folding mechanism

Abstract

The invention provides a single-degree-of-freedom conical axial and radial synchronous unfolding and folding mechanism, and particularly belongs to the technical field of aircrafts. Through the structural arrangement of connection between the main supporting rod and the auxiliary supporting rod, the overall conical mechanism can be unfolded through the axially-arranged fixing circular ring, and the overall conical mechanism is good in rigidity and simple in structure; through the structural arrangement of the two supporting assemblies, the overall conical mechanism has the structural characteristics of being single in degree of freedom, simple in structure and high in rigidity, and the unfolding and folding ratio of the overall cone is larger. The device comprises a main supporting rod and an auxiliary supporting rod, and further comprises a fixing circular ring, an upper-layer supporting assembly and a lower-layer supporting assembly. An auxiliary supporting rod is arranged above the main supporting rod, a fixing circular ring is arranged above the auxiliary supporting rod, an upper-layer supporting assembly is arranged between the main supporting rod and the auxiliary supporting rod, and a lower-layer supporting assembly is arranged below the main supporting rod. 24 third revolute pairs are installed on the fixed circular ring at equal angles, and one end of each third revolute pair is connected with an auxiliary supporting rod.

Description

Technical Field

[0001] The invention relates to a single-degree-of-freedom conical axial and radial synchronous expansion and contraction mechanism, and in particular belongs to the technical field of aircraft. Background Art

[0002] Due to the limited space of the carrier, the space deployable mechanism is widely used in the design of aircraft payloads. The conical deployable mechanism can be used in many application scenarios such as protective devices and satellite antennas.

[0003] Radially retractable mechanisms are generally implemented through scissor-type mechanisms, which cannot be retracted or even extended in the axial direction. Axially retractable mechanisms are often folded through two inwardly bent links. After such mechanisms are deployed, the hinge joints need to be locked to achieve motion locking after the deployment, which also makes the mechanism heavy and complex in structure. Summary of the invention

[0004] The object of the present invention is to provide a single-degree-of-freedom conical axial and radial synchronous expansion and contraction mechanism to ensure that the expansion rigidity of the conical mechanism is good and the structure is simpler.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: the invention includes a main support rod and a secondary support rod, and also includes a fixed ring, an upper support assembly and a lower support assembly;

[0006] A secondary support rod is arranged above the main support rod, a fixed ring is arranged above the secondary support rod, an upper support assembly is arranged between the main support rod and the secondary support rod, and a lower support assembly is arranged below the main support rod.

[0007] Furthermore, the deployment and retraction mechanism is driven by a fixed ring, and the cone mechanism is deployed by the cooperation of the upper support assembly and the lower support assembly, and the mechanism has the advantages of simple structure, light weight, high rigidity, etc.

[0008] 24 third rotation pairs are installed at equal angles on the fixed ring, one end of the third rotation pair is connected to a secondary support rod, and the other end of the secondary support rod is connected to the second rotation pair, and the third rotation pairs are all in the same plane;

[0009] Furthermore, the deployment mechanism is driven to be deployed by the fixed ring, which is a single rod, and the deployment mechanism is supported by the cooperation of the second rotating pair and the auxiliary support rod.

[0010] The center of the fixed ring intersects with a straight line perpendicular to the third rotational secondary axis, that is, the axis is perpendicular to the diameter of the fixed ring;

[0011] Furthermore, the third rotation pair makes the unfolding and retracting mechanism more stable.

[0012] The upper support assembly includes a Hooke hinge and a support rib;

[0013] A Hooke's hinge is arranged on the inner side of the second revolving pair, one end of the Hooke's hinge is connected to a supporting rib plate, two supporting rib plates are arranged, and the two supporting rib plates are connected together;

[0014] Furthermore, the supporting ribs can be extended and retracted through the cooperation of the second rotation pair and the Hooke's hinge.

[0015] The lower support assembly includes a first rotating pair, a first annular support rod, a second annular support rod and a third annular support rod; the bottom end of the main support rod is connected to the first rotating pair, the other end of the first rotating pair is connected to the first annular support rod, four first annular support rods are arranged corresponding to the main support rods, a second annular support rod and a third annular support rod are arranged between two adjacent first annular support rods, and the second annular support rod and the third annular support rod are connected together;

[0016] The first annular support rod, the second annular support rod and the third annular support rod are each provided with four groups, and the four groups of the first annular support rod, the second annular support rod and the third annular support rod cooperate to form a complete circular support that forms a bottom after being unfolded;

[0017] Furthermore, the main support rod cooperates with the first rotating pair to support the structure, and the first annular support rod, the second annular support rod and the third annular support rod cooperate to form a complete circular support that forms a bottom after unfolding.

[0018] There is a certain inclination angle between the secondary support rod and the second rotation pair, and there is a certain inclination angle between the main support rod and the first rotation pair. The two sets of inclination angles are set the same. The inclination angles make it possible for the four main support rods to avoid interference between the rods when they are in the inwardly retracted state.

[0019] Furthermore, by ensuring that the inclination angles between the 24 auxiliary support rods and the second rotation pair are consistent, the inclination angle ensures that no interference between the rods occurs when the four main support rods are in the inwardly retracted state.

[0020] The beneficial effects of the present invention are:

[0021] 1. Through the structural setting of the connection between the main support rod and the auxiliary support rod, the overall conical mechanism can be unfolded through the axially arranged fixed ring, and the overall conical mechanism has good rigidity and simple structure.

[0022] 2. Through the structural setting of two groups of support components, the overall cone mechanism has the structural characteristics of single degree of freedom, simple structure, and high rigidity, and the expansion and contraction ratio of the overall cone is larger. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the first rotating pair of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the second annular support rod and the third annular support rod of the present invention;

[0026] Figure 4 It is a schematic diagram of the supporting rib structure of the present invention;

[0027] Figure 5 It is a schematic diagram of the folded structure of the overall structure of the present invention.

[0028] 1. Main support rod; 2. First rotation pair; 3. Second rotation pair; 4. First annular support rod; 5. Second annular support rod; 6. Third annular support rod; 7. Auxiliary support rod; 8. Hooke's hinge; 9. Support rib; 10. Fixed ring; 11. Third rotation pair. DETAILED DESCRIPTION

[0029] The following will be combined with the attached Figure 1-5 , clearly and completely describe the technical solutions in the embodiments.

[0030] Specific implementation method 1: Figure 1 and Figure 4 As shown, the overall structure includes a fixed ring 10, an upper support assembly and a lower support assembly. The upper end of the main support rod 1 is connected to the upper support assembly, and the lower end of the main support rod 1 is connected to the lower support assembly. The upper support assembly and the lower support assembly are controlled to be unfolded and retracted through the fixed ring 10, so that the overall conical mechanism has the structural characteristics of single degree of freedom, simple structure, and high rigidity, and the overall conical expansion and retraction ratio is larger;

[0031] The outside of the fixed ring 10 is rotatably connected with 24 third rotating pairs 11 at equal angles, the center of the fixed ring 10 intersects with a straight line perpendicular to the axis of the third rotating pair 11, that is, the axis is perpendicular to the diameter of the fixed ring 10, and the other ends of the 24 third rotating pairs 11 are rotatably connected with the auxiliary support rods 7. At this time, the 24 auxiliary support rods 7 are rotatably arranged below the fixed ring 10 at equal angles, so that the fixed ring 10 can drive the auxiliary support rods 7 to rotate through the third rotating pairs 11;

[0032] The other end of the auxiliary support rod 7 is rotatably connected to the second rotating pair 3, and a Hooke's hinge 8 is rotatably provided inside the second rotating pair 3. One end of the Hooke's hinge 8 is rotatably connected to a supporting rib plate 9. Two supporting rib plates 9 are provided, and the two supporting rib plates 9 are rotatably connected together, so that the auxiliary support rod 7 drives the two supporting rib plates 9 to rotate through the second rotating pair 3 and the Hooke's hinge 8, thereby realizing the multi-angle expansion and folding of the structure;

[0033] The axis of the Hooke's hinge 8 connected to the supporting rib 9 is arranged parallel to the axis of the second revolving pair 3 and the axis of another Hooke's hinge 8. The three axes are in the same plane, that is, the line connecting the three axes is a straight line. The position of the Hooke's hinge 8 and the supporting rib 9 is the dead point position of the structure, thereby limiting the final position state of the unfolding mechanism;

[0034] There are 24 second rotation pairs 3 corresponding to the secondary support rods 7, and four main support rods 1 are fixedly connected at equal angles below the 24 second rotation pairs 3. At this time, the four main support rods 1 and four of the 24 secondary support rods 7 are arranged in the same straight line, and the main support rods 1 can be driven to move through the secondary support rods 7;

[0035] Specific implementation method 2: Figure 2-3 and Figure 5 As shown, the other end of the main support rod 1 is rotatably connected to the first rotating pair 2, and the other end of the first rotating pair 2 is rotatably connected to the first annular support rod 4. Four first annular support rods 4 are arranged corresponding to the main support rod 1, and a second annular support rod 5 and a third annular support rod 6 are rotatably arranged between two adjacent first annular support rods 4. The second annular support rod 5 and the third annular support rod 6 are rotatably connected together. The first annular support rod 4, the second annular support rod 5 and the third annular support rod 6 are all arranged in four groups. The four groups of the first annular support rod 4, the second annular support rod 5 and the third annular support rod 6 cooperate to form a complete circular support that forms the bottom after being unfolded, so that the overall structure can be stably unfolded and folded;

[0036] By setting the inclination angle between the auxiliary support rod 7 and the second rotating pair 3 to be the same as the inclination angle between the main support rod 1 and the first rotating pair 2, there is no interference between the rods when the four main support rods 1 are in the inwardly retracted state, so that the overall conical mechanism has the structural characteristics of single degree of freedom, simple structure, and high rigidity, and the expansion and contraction ratio of the overall cone is larger.

[0037] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement made to the above embodiments without departing from the content of the technical solution of the present invention, based on the technical essence of the present invention, within the spirit and principles of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims

1. A single-degree-of-freedom conical axial radial synchronous expansion and contraction mechanism, comprising a main support rod (1) and a secondary support rod (7), characterized in that: It also includes a fixed ring (10), an upper support assembly and a lower support assembly; A secondary support rod (7) is arranged above the main support rod (1), a fixing ring (10) is arranged above the secondary support rod (7), an upper support assembly is arranged between the main support rod (1) and the secondary support rod (7), and a lower support assembly is arranged below the main support rod (1).

2. A single-degree-of-freedom conical axial and radial synchronous expansion and contraction mechanism according to claim 1, characterized in that: 24 third rotating pairs (11) are installed at equal angles on the fixed ring (10), one end of the third rotating pair (11) is connected to a secondary support rod (7), the other end of the secondary support rod (7) is connected to a second rotating pair (3), and the third rotating pairs (11) are all in the same plane.

3. A single-degree-of-freedom conical axial and radial synchronous expansion and contraction mechanism according to claim 2, characterized in that: The center of the fixed circular ring (10) intersects with a straight line perpendicular to the axis of the third rotating pair (11), that is, the axis is perpendicular to the diameter of the fixed circular ring (10).

4. The single-degree-of-freedom conical axial and radial synchronous expansion and contraction mechanism according to claim 1, characterized in that: The upper support assembly comprises a Hooke hinge (8) and a support rib plate (9); A Hooke's hinge (8) is arranged inside the second rotating pair (3), one end of the Hooke's hinge (8) is connected to a supporting rib plate (9), two supporting rib plates (9) are arranged, and the two supporting rib plates (9) are connected together.

5. The single-degree-of-freedom conical axial and radial synchronous expansion and contraction mechanism according to claim 1, characterized in that: The lower support assembly comprises a first rotating pair (2), a first annular support rod (4), a second annular support rod (5) and a third annular support rod (6); The bottom end of the main support rod (1) is connected to a first rotating pair (2), the other end of the first rotating pair (2) is connected to a first annular support rod (4), four first annular support rods (4) are arranged corresponding to the main support rod (1), a second annular support rod (5) and a third annular support rod (6) are arranged between two adjacent first annular support rods (4), and the second annular support rod (5) and the third annular support rod (6) are connected together.

6. The single-degree-of-freedom conical axial and radial synchronous expansion and contraction mechanism according to claim 5, characterized in that: Four groups of the first annular support rod (4), the second annular support rod (5) and the third annular support rod (6) are provided, and the four groups of the first annular support rod (4), the second annular support rod (5) and the third annular support rod (6) cooperate to form a complete circular support that forms a bottom after being unfolded.

7. The single-degree-of-freedom conical axial and radial synchronous expansion and contraction mechanism according to claim 1, characterized in that: There is a certain inclination angle between the auxiliary support rod (7) and the second rotating pair (3), and there is a certain inclination angle between the main support rod (1) and the first rotating pair (2). The two sets of inclination angles are set in the same way. The inclination angles prevent interference between the four main support rods (1) when they are in an inwardly retracted state.

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