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

A technology of super large load and unlocking device, which is applied in the docking device of aerospace vehicles, motor vehicles, transportation and packaging, etc. It can solve the problems of inability to release super large loads, poor anti-vibration and shock performance without redundant design, and achieve Prevents heat loss, shortens heating and deformation time, and releases large loads

Inactive Publication Date: 2018-06-22
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 pe

Method used

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

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Embodiment Construction

[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0041] The invention provides an SMA wire-driven super-large load unlocking device, the structure of which is as follows: Figure 1 ~ Figure 3 shown. The lower cover 11 is connected to the fixed structure, the large bolt 13 is connected to the separation structure, the large bolt 13 and the split nut 8 are connected by a thread pair, and the split nut 8 locks the large bolt 13 under the wrapping of the scroll spring 10, thereby realizing Connection function; the inner end of the scroll spring 10 is fixed on the split nut 8, and the outer end is connected with the frame 6 through a pin, and the split nut 8 and the frame 6 cooperate with the inner ring and the outer ring of the bearing 7 respectively; The head is fixed on the upper cover 12, and the lower part is inserted into the hexagonal hole on the top surface of the split nut 8; one end of the SMA wire 1 ...

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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...

Claims

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Application Information

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IPC IPC(8): B64G1/64
CPCB64G1/645
Inventor 闫晓军张小勇黄大伟漆明净
Owner BEIHANG UNIV
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