Deployable Mechanism of Spaceborne Antenna

Abstract

A space-borne antenna deployable mechanism for a switch of the present invention aims to provide a deployable mechanism with high positioning accuracy and stable and reliable operation. The present invention is realized through the following technical solutions: an unlocking mechanism corresponding to the passively driven hinge and a locking mechanism located below the extending arm corresponding to the rotation axis of the joint hinge are installed on the extension arm; After driving the hinge to connect the joint to rotate, it is fixed on the extension arm through the unlocking mechanism; when the locking command is activated, the locking mechanism performs the unlocking action, and the elastic potential energy of the synchronous gear transmission joint hinge drives the extension arm to rotate slowly around the axis of the synchronous gear transmission joint hinge, and the locking mechanism The cable connected to the unlocking mechanism triggers the unlocking action of the unlocking mechanism, and the cable is linked with the unlocking mechanism to unlock and release the extension arm; after unlocking, the passive drive hinge slowly rotates to a predetermined angle according to the rotation direction, and gradually completes the extension of the extension arm and antenna action, lock and hold as working.

Description

technical field [0001] The invention relates to an aerospace on-board mechanism, in particular to a deployable mechanism for a on-board antenna. Background technique [0002] The deployable mechanism in the aerospace field has an irreplaceable position and has been used as a solar windsurfing board, a displayable space station radar antenna, a space radio telescope launch antenna, a space operation platform, and an extension arm. The space deployable mechanism is a structural unit composed of flexible cables, rods, beams and plates through fastening, hinges, sliding fit, folding, etc. Release (energy storage type) driven deployment. The main indicators of the space expandable mechanism are storage rate, quality and deployment reliability, and structural rigidity. High storage rate enables the mechanism to be folded into a smaller volume and placed in the payload compartment; light weight, which can reduce launch costs; high deployment reliability, minimize risks; high rigi...

AI Technical Summary

Problems solved by technology

The antenna and its extension arm need to set multiple locking points. The common solution is to use an independent unlocking mechanism for each locking point, or use a mechanism to realize the rigid linkage of the locking points to unlock. Using multiple independent unlocking mechanisms will increase the unlocking speed. The power demand of the device on the platform, and the rigid linkage will increase the weight of the mechanism, which is not conducive to the small and lightweight design of the product

[0009] Most space-borne deployable antennas use passive deployment power sources (such as torsion springs, pressure springs, etc.). Due to the high flexibility of the antenna system, during the deployment process of the antenna, in addition to the displacement of the rigid body, elastic deformation occurs. The antenna is arranged on the The spring on the node is expanded, and the expansion action must be completed by using two rotating hinges. Its disadvantage is that the structure is heavy and the manufacturing cost is high.

The two movements are coupled with each other, coupled with the influence of hinge clearance and friction, the assembly and adjustment of the antenna are relatively difficult, and the reliability of deployment is relatively low.

The large spaceborne deployable antenna has large size, small rigidity, complex deployment mechanism, and harsh environment; at the same time, due to the small stiffness of the antenna, the natural frequency is very low (fully deployed state)

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