Rigid-flexible shear-fork mechanism-based deployable surface truss mechanism
A scissor and truss technology, applied in the field of deployable curved truss mechanisms, can solve the problems of organic unity and difficult to achieve curved surface accuracy, and achieves the effects of strong integrity, easy connection and reduction of stuck phenomenon.
Active Publication Date: 2018-10-12
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology
[0007] The defect of the above-mentioned prior art is that it is difficult to achieve a good organic unity in the four aspects of engineering manufacturing, folding performance, folding ratio and surface accuracy.
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Embodiment 1
[0059] This embodiment provides a deployable curved truss mechanism based on a rigid-flexible mixed scissor mechanism. In order to facilitate the understanding of this embodiment, the theoretical model and modeling process of the curved truss mechanism of this embodiment will be described in detail below.
[0060] The ideal working surface of a space antenna is a parabola, which can reflect parallel incident electromagnetic waves to a focal point to collect the signal source. However, due to the high cost of manufacturing a large parabolic mirror, it is usually replaced by a curved surface with consistent curvature; in theoretical modeling During analysis, surfaces with consistent curvature are also used to simplify the model. For this, as figure 1 As shown, this embodiment first uses the central projection principle to use the upper and lower curved surfaces of the spherical shell with the same spherical center and different radii as the most basic projected surfaces, so as t...
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The invention provides a rigid-flexible shear-fork mechanism-based deployable surface truss mechanism. The rigid-flexible shear-fork mechanism-based deployable surface truss mechanism comprises a plurality of triangular-pyramid units, wherein each triangular-pyramid unit comprise three shear-fork mechanisms which are connected in an end-to-end way, each shear-fork mechanism comprises two same longitudinal rods, two same shear-fork rods and two same connection rods, the two shear-fork rods are connected with a pair of rotation R1 to form a shear-fork mechanism, initial ends of the two shear-fork rods are connected to lower ends of the two longitudinal rods respectively by a pair of rotation R2, initial ends of the two connection rods are connected to upper ends of the two longitudinal rodsrespectively by a pair of rotation R3, tail ends of the two connection rods are connected to tail ends of the two shear-fork rods respectively by a pair of rotation R4, the three shear-fork mechanismsare of dual-4R mechanisms, the connection rods of one of the shear-fork mechanisms are flexible connection rods, and the connection rods of the other two shear-fork mechanisms are rigid connection rods. The rigid-flexible shear-fork mechanism-based deployable surface truss mechanism has the advantages of single degree of freedom, good folding and unfolding performance, large folding and unfoldingratio, light weight, high strength, high surface precision and the like, and engineering manufacturing is easy.
Description
technical field [0001] The invention relates to an expandable curved surface truss mechanism based on a rigid-flexible scissor mechanism. Background technique [0002] Due to the limited load space of the launch vehicle, the space antenna is usually designed as a foldable mechanism, and is in a fully folded state during the launch to obtain the smallest volume. When it reaches the predetermined orbit, it will be stably unfolded to the working state according to relevant instructions. Today, a variety of deployable mechanisms have been developed that are applicable to space antennas. [0003] Chinese patent document CN106450647A discloses a scissor-type hexagonal prism expandable unit and a space expandable mechanism composed of it. A faceplate, six sets of scissor folding links and twelve sets of folding links, one set of folding links depends on the length of the link to limit the expansion of the basic expandable unit, and the remaining eleven sets of folding links are al...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H01Q1/08H01Q1/10H01Q1/18H01Q1/28
CPCB64G1/222H01Q1/08H01Q1/10H01Q1/1235H01Q1/18H01Q1/28H01Q1/288
Inventor 李兵黄海林张铁山贾广鲁梁国桢
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL