SMA-Wire-actuated (shape memory alloy wire-actuated) ultrahigh-load unlocking device

Abstract

The invention provides an SMA-wire-actuated (shape memory alloy wire-actuated) ultrahigh-load unlocking device. A split nut and a large bolt are used herein as connectors. A volute spring is used as afastener, and an SMA wire is used as a separation actuating element. The large bolt is connected with a separation structure. The split nut is enclosed by the volute spring to lock the large bolt. The inner end of the volute spring is fixed to the split nut, and the outer end of the volute spring is connected to a frame. The frame in locked state is limited by a restraint system composed of a presser and a clamp pin. To achieve separation, the SMA wire is electrified and heated to experience phase change and contraction, the presser is driven to move, the clamp pin is freed from limiting, theframe with no restraint rotates with the volute spring under resetting power of the volute spring, after the volute spring loosens, and the split nut expands under the action of its sheet structure to release the large bolt. The SMA-wire-actuated ultrahigh-load unlocking device has high drive ratio, high release load, high reliability, good vibration resistance, and high impact performance.

Description

technical field [0001] The invention relates to the technical field of unlocking devices for spacecraft, in particular to a split nut unlocking device. Background technique [0002] The spacecraft needs a variety of unlocking devices to realize the 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. Most of these devices are pyrotechnic bolts (also known as explosive bolts) at present. At present, most of these devices are pyrotechnic bolts (also known as explosive bolts). The pyrotechnic bolts will cause impact during the process of unlocking and separating, and will leave explosive debris, dust, chemical gases, etc. in the spacecraft, causing pollution problems. With the development of technology, especially the emergence of a new generation of small satellites, the contradiction between the defects of pyrotechnic bolts and the rapidly growing application requireme...

AI Technical Summary

Problems solved by technology

[0010] The invention mainly solves the problems in the prior art that the driving ratio is low, the super load cannot be released, the redundant design is not carried out, and the anti-vibration and shock performance are poor, and it provides a high driving ratio, which can release super large loads and is reliable. Split nut unlocking device driven by SMA wire with high anti-vibration and strong shock capacity

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