Spatial observation optical remote sensing equipment very large diameter expansible primary mirror precision locking apparatus

Abstract

The invention discloses a precise locking device for a super-large caliber expandable primary mirror of an optical sensor for space observation, comprising a positioning device and a locking device, wherein the positioning device comprises a set of positioning blocks confining three free degrees, a set of positioning blocks confining two free degrees and a set of positioning blocks confining one free degree; each set of positioning block a positioning block fixed on a bracing structure of a middle mirror of the primary mirror and a sub-positioning block fixed on a bracing structure of a block mirror of the primary mirror. The locking device comprises a fixed spring nut, a front foundation, a spring, a locking nut, a rear foundation, a push bearing, a locking bolt, a decelerator and a stepper motor. The locking device of the precise locking device carries out positioning and locking separately so as to de-skill the processing and controlling difficulty, improves the precision of positioning and the stability of locking and realizes the nano-scale stability. The invention is also applicable to other large space expansion mechanism.

Description

technical field [0001] The invention belongs to the field of space optics precision deployment mechanism, in particular to a space observation optical remote sensor extra-large diameter expandable primary mirror locking device for precise locking. Background technique [0002] With the rapid development of space camera technology and the continuous improvement of demand, the requirements for space camera resolution are getting higher and higher, and the basic way to improve the resolution is to increase the aperture of the optical system. If the primary mirror of the super-large aperture (≥4m) of the space observation optical remote sensor adopts the traditional integral large-aperture optical system, considering the requirements of energy and transfer function, the optical system has a large aperture and a long focal length (≥35m), and the primary mirror is very large. Heavy (18,000kg). If the traditional weight reduction method is used to reduce weight, the main mirror wi...

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Problems solved by technology

However, these methods have extremely high requirements on the processing of positioning pins or precision bolts, and are difficult to manufacture. It is difficult to achieve high positioning accuracy, and it is difficult to change and measure the locking force. At the same time, they are more sensitive to dynamic load disturbances. The repetition accuracy and stability accuracy of a well-designed locking mechanism are only on the order of microns. Higher precision requires an integrated locking mechanism that is prone to cold welding in a space environment. Therefore, it is difficult to meet the needs of large-caliber expandable primary mirrors for optical remote sensors. Requirements for precision locking mechanisms

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