Truss type spatial antenna extension arm

Abstract

The invention discloses a truss type spatial antenna extension arm which is composed of a hinged quadrilateral cross rod, a hinged longitudinal rod, a driving mechanism and a locking device. The hinged quadrilateral cross rod is composed of a cross rod, a first locking hinged joint, a second locking hinged joint and a third locking hinged joint and provides lateral support for the longitudinal rod. The hinged longitudinal rod is composed of a longitudinal rod body and a fourth locking hinge head and provides supporting rigidity. The driving mechanism comprises a driving gear and a driving leadscrew; and the locking device consists of a spring clip and a steel ball. The cross rods and the longitudinal rods are in threaded connection with the hinge heads, and mounting and dismounting are convenient. The driving mechanism enables a hinge block to do linear motion through a lead screw nut and drives the whole stretching arm to be unfolded and folded. After unfolding is completed, the locking device of the hinged joints enables the mechanism to be locked, and rigidity of the stretching arm truss unit is achieved. The truss type spatial antenna extension arm has the advantages of beingsmall in mass, high in strength and high in repeated unfolding positioning precision. And the extension arm can also be used for a solar cell array, a sailboard and a space detector.

Description

technical field [0001] The invention relates to the technical field of space antennas, in particular to a truss type space antenna extension arm. Background technique [0002] A folding mechanism refers to a device or mechanism that can unfold from a folded state to a predetermined or desired structural form and can withstand a specific load. With the development of the aerospace industry, more and more aerospace projects will use some large-scale on-orbit structures to meet the needs of different space missions. However, due to the limitation of the volume of the launch vehicle, the size of the non-foldable structure that can be launched into space cannot meet the needs of the mission, so various types of space-space folding mechanisms have been rapidly developed and applied. [0003] The space extension balance is the one-dimensional space folding mechanism with the most abundant forms, the earliest research and the most widely used among the space folding mechanisms. Wh...

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Problems solved by technology

[0004] Invention patent CN200810240159 discloses "a coiled triangular horizontal frame with hinged space extension arm", which is characterized by high shrinkage ratio, independent deployment, and low cost, but the support rigidity and deployment accuracy are poor, and it is difficult to ensure that the antenna can be deployed smoothly. Arrive at the predetermined location

[0005] Invention patent CN201310658713 discloses "a retractable space extension arm for satellites", which is characterized by high storage rate, light weight, and high rigidity, but the deployment diameter is small and the deployment accuracy is poor, so it cannot be applied to large-scale extendable antennas

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