A New Rib Expanding Mechanism for High Precision Umbrella Antenna

Abstract

A new type of high-precision umbrella-shaped antenna rib expansion mechanism, the motor and reducer provide power for the rib expansion mechanism; the screw is connected to the reducer through the coupling block, and rotates itself under the drive of the reducer, and the nut is set on the screw. The rotating motion of the lead screw is converted into the up and down linear motion of the nut; the sliding plate is set on the guide sleeve, connected with the nut through a limit screw, and moves up and down together with the nut; one end of the connecting rod is hinged to the sliding plate through a rotating shaft, and the other end It is hinged with the locking arm; the umbrella-shaped antenna rib is installed on the H surface of the locking arm, and the locking arm is driven by the connecting rod to rotate, and then drives the antenna rib to complete the unfolding or retracting action; the locking device in place is used for the antenna rib to be unfolded in place. Locking, so that the antenna rib has sufficient rigidity; the invention realizes the smooth deployment and retraction of the high-precision umbrella antenna and the process is controllable, and has the characteristics of high repeated deployment accuracy and small thermal deformation.

Description

technical field [0001] The invention relates to a novel rib unfolding mechanism for a high-precision umbrella antenna, which is used to realize the unfolding and folding of the high-precision umbrella antenna, and belongs to the technical field of satellite antenna mechanisms. Background technique [0002] The present invention originates from the research and development of high-precision radial rib umbrella-shaped deployable antenna. In order to meet the envelope requirements during satellite launch, the large-diameter antenna should have the characteristics of high storage ratio, and the antenna should be locked and stored on the satellite platform during satellite launch. , and then expand into a working state after being in orbit, such as figure 1 As shown, this requires the antenna product to be able to realize the functions of folding and unfolding in addition to the established mission functions. [0003] Such as figure 2 As shown, the radial rib umbrella-shaped d...

AI Technical Summary

Problems solved by technology

[0010] According to the latest information, there are currently two specific structural forms for the deployment of high-precision umbrella-shaped deployable antennas: one is the umbrella-shaped deployable antenna developed by Russia and applied to the relay satellite "Ray 5". The deployment is driven by steel wire pulling, that is, each rib is pulled and unfolded by a steel wire. Since the steel wire can only transmit pulling force but not thrust, the antenna cannot stop after the unfolding process begins, let alone achieve reverse folding through the unfolding mechanism. , and when the antenna mouth faces forward, the lower half of the ribs will instantly unfold under the action of gravity, but the upper half of the ribs is still in a retracted state, so it is impossible to carry out the test of the mouth facing forward; The umbrella-shaped deployable antenna on the satellite TDRS is driven by a lead screw. Since the lead screw has a self-locking effect, the antenna can be deployed with the mouth facing forward. If there is an abnormality in the orbit deployment process, the deployment can be stopped or Reversely folded, but no relevant literature reports have been found on the function, performance requirements and specific structure of the rib unfolding mechanism

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