A spatial radial unlocking mechanism driven by a shape memory alloy SMA tow

Abstract

The invention provides a spatial radial unlocking mechanism driven by a shape memory alloy SMA tow, a base is fixed on the bottom of the outer cover of the mechanism and an upper cover is installed onthe top, the bolt is inserted through the through hole of the upper cover and is located above the top block, a locate block and two split nuts are sleeve on that outer periphery of the bolt, the outer periphery of the two split nut is provided with a groove, a rigid clamp is arranged in the groove of the two split nuts and an H-shaped fixing frame is arranged at the closed end of the two split nuts, and an SMA shape memory alloy wire bundle is wrapped around the outer periphery of the rigid clamp and fixed on the fixing frame. The invention solves the problem that the impact of the spatial radial unlocking mechanism in the prior art is large, a spatial radial unlocking mechanism driven by shape memory alloy SMA tow is provided, which adopts the radial driving mode of shape memory alloy SMA tow, and has the advantages of low impact, large driving displacement, high driving accuracy, short unlocking time, high moving accuracy, low friction and no pollution.

Description

technical field [0001] The invention relates to a spatial radial unlocking mechanism driven by SMA tow, belonging to the field of aerospace system unlocking structures. Background technique [0002] After the satellite is launched, many auxiliary devices such as antennas and solar panels are required to be successfully separated from the parent body in order to successfully complete their on-orbit tasks. Most of the release devices are pyrotechnic devices, which have short action time, small size, and relatively small energy input. However, these release devices are likely to cause high impact loads and space pollution, and the processing cost is huge. Therefore, it is necessary to study a separation device that can replace traditional pyrotechnic devices. Its advantage over pyrotechnic devices lies in low shock loads. Pollution, reusable. [0003] Due to the unique shape memory properties of shape memory alloy SMA, under deformation conditions, when the temperature exceeds...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the spatial radial unlocking mechanism in the prior art has a large impact, small driving force, and difficult to guarantee the motion accuracy of the ball, and provides a spatial radial unlocking mechanism driven by a shape memory alloy SMA wire bundle , using shape memory alloy SMA filament radial drive mode, with low impact, large drive displacement, high drive precision, short unlocking time, high motion precision, low friction, and no pollution

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