Shape memory alloy (SMA) group rolling rod type large load releasing mechanism

Abstract

The invention provides a shape memory alloy (SMA) group rolling rod type large load releasing mechanism. A segmented nut of the mechanism is firmly hooped by a hooping cylinder through rolling rods, simultaneously the upper end face and the lower end face of the segmented nut are respectively matched with an end cover and a separating ejector block, so that the segmented nut is a total nut and cannot move vertically. Groove are arranged on the segmented nut, so that when separation is needed, and the hooping cylinder moves downwards to drive the rolling rods to roll downwards and properly enter the grooves of the segmented nut when moving to a certain position, so that the segmented nut can obtain radial displacement. When releasing is finished, the hooping cylinder moves upwards under the effect of an SMA reset spring and simultaneously push the rolling rods out from the grooves, and the segmented nut draws close toward the inside to form an integral thread, so that repeated using function of the mechanism can be achieved, the segmented nut is fit with the separating ejector block through a conical surface, and the separating ejector block is matched with the hooping cylinder through two end faces. The shape memory alloy (SMA) group rolling rod type large load releasing mechanism is strong in shock resistance, releases large load and has the redundancy design and high reliability.

Description

technical field [0001] The present invention relates to the technical field of load release mechanisms, in particular to an SMA grouped roller bar type large load release mechanism, which is specifically driven by SMA (shape memory alloy) wires, based on grouped roller bar split nut structures and SMA return springs The spatial connection and release mechanism. Background technique [0002] The spacecraft needs a variety of connection and separation mechanisms to realize space connection and unlocking functions, such as the separation of multi-stage launch vehicles, the deployment of solar wings on satellites or spacecraft, and so on. At present, this unlocking device is mostly an pyrotechnic bolt (also known as an explosive bolt). With the development of aerospace technology, especially the emergence of a new generation of small satellites, the problem of impact and pollution caused by explosives is becoming more and more serious. One of the main focuses to solve this prob...

AI Technical Summary

Problems solved by technology

[0007] The invention mainly solves the problems of low impact resistance, small release load, no redundant design, and low reliability of existing mechanisms, and provides an SMA wire with strong impact resistance, large release load, redundant design, and high reliability. Driven Spatial Connection and Release Mechanism

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