A gravity unloading device for a large off-axis three-mirror space camera

Abstract

The invention discloses a gravity unloading device for a large off-axis three-mirror space camera, which comprises a horizontally arranged base and an end seat; The upper fine adjustment mechanism is configured as an upper fine adjustment mechanism, and the fine adjustment mechanism located at the lower part of the coarse adjustment mechanism is configured as a lower fine adjustment mechanism; the base is used to carry the coarse adjustment mechanism and the fine adjustment mechanism. The present invention greatly reduces the volume of the fine-tuning mechanism, and through the cooperation of the coarse-tuning mechanism and the fine-tuning mechanism, unloading force can be applied to multiple points at different positions in the space, and each unloading force can be suspended or supported in two ways , the number of fine-tuning unloading devices on each guide rail is variable, and the adaptability is good; the present invention can accurately provide the unloading force in the direction of gravity, whether it is supporting unloading or hanging unloading, and each fine-tuning assembly has a pull / The pressure sensor is able to monitor the value of the applied force in real time with high precision.

Description

technical field [0001] The invention relates to the technical field of ground testing of aerospace loads, in particular to a gravity unloading device for a large off-axis three-mirror space camera. Background technique [0002] The cantilever aerospace structure will be affected by gravity during ground assembly and adjustment, resulting in the deformation caused by gravity participating in the installation and adjustment process of optical components. When it is in a microgravity environment, the camera structure will rebound after adjustment, affecting the position of optical components. precision. The distance between the mirrors of the off-axis three-mirror camera is relatively large. When the optical axis is horizontal, it is not enough to increase the structural rigidity to compensate for the error caused by gravity. In order to improve the accuracy of the system, it must be unloaded by gravity to overcome the The "heaven-earth" inconsistency effect of the structure. ...

AI Technical Summary

Problems solved by technology

[0004] (1) In terms of the release of gravity unloading degrees of freedom, the main disadvantage is that the release of degrees of freedom is not complete, including the inability to release all the other 5 degrees of freedom except the direction of gravity, and the amount of compensation released in each direction of freedom is relatively small

[0005] (2) In terms of applicability, it is impossible to unload any point in a limited space conveniently and quickly

And the unloading method is relatively simple, and there is no combination of suspension and support devices, which will lead to problems such as tooling and load interference when unloading at certain points

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