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Fuse SMA (shape memory alloy) wire space connecting and disconnecting mechanism

A technology of spatial connection and separation mechanism, which is applied to the docking device, projectile, self-propelled projectile and other directions of aerospace vehicles, can solve the problems of poor impact load capacity and incomplete unlocking, etc., and achieves strong impact load capacity, complete unlocking, and improved The effect of using reliability

Inactive Publication Date: 2014-04-23
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The present invention mainly solves the problems of incomplete unlocking, lack of redundant design, and poor anti-vibration and shock load capabilities in the prior art, and provides a fuse with complete unlocking, high reliability, strong anti-vibration and shock load capabilities SMA wire spatial connection and separation mechanism

Method used

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  • Fuse SMA (shape memory alloy) wire space connecting and disconnecting mechanism
  • Fuse SMA (shape memory alloy) wire space connecting and disconnecting mechanism
  • Fuse SMA (shape memory alloy) wire space connecting and disconnecting mechanism

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034]According to one aspect of the present invention, the space connection and separation mechanism of the fuse SMA wire is provided with: a split nut, used for threaded connection with a bolt, which is completely divided into two petals, and the two petal nuts are provided with matching shaft holes , and use a shaft to pass through the two holes in turn to connect with the shell, the two-lobe nuts can rotate in the direction away from each other in the axial direction, so that the two-lobe nuts can be fully opened; the binding spring of the split nut is a cylindrical helical twist The spring is arranged on the outside of the split nut. In the connected state, it is in a tightened state, and its inner diameter is equal to the outer diameter of the split nut, so as to bind the split nut tightly, thus maintaining the radial constraint on the split nut. ...

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Abstract

The invention provides a fuse SMA (shape memory alloy) wire space connecting and disconnecting mechanism which is provided with a split nut, a tightening spring of the split nut and a release device of the tightening spring, wherein the release device of the tightening spring is two SMA wires, one end of the first SMA wire is connected with the upper end of the tightening spring of the split nut, the other end of the first SMA wire is connected with the upper end of an outer housing, and is tensioned under the action of the tightening spring, one end of the second SMA wire is connected with the other lower end of the tightening spring of the split nut, and the other end of the second SMA wire is connected with the lower end of the outer housing, and is tensioned under the action of the tightening spring. When the two SMA wires are heated by high current, a huge recovery stress is generated caused by the phase change in the two SMA wires, the fracture strength of the material can be reduced caused by high temperature, the two SMA wires are fractured under the combined action of the huge recovery stress and the reduced fracture strength, the restriction on the tightening spring can be released, the two SMA wires are backup mutually, the redundancy design can be realized, and the very high reliability can be guaranteed; and the connecting and disconnecting mechanism is thorough in unlocking, high in reliability, and good in vibration resistance and impact load resistance.

Description

technical field [0001] The present invention relates to the technical field of spacecraft connection-separation mechanism, in particular to a fuse SMA wire connection and separation mechanism, which uses shape memory alloy (SMA) wire to increase the recovery stress and decrease the fracture strength at high temperature, thereby causing the SMA wire Fracture releases the constraint of the binding spring on the split nut to realize the separation mechanism. Background technique [0002] The spacecraft needs a variety of connection-detachment mechanisms 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. At present, this unlocking device is mostly an pyrotechnic bolt (also known as an explosive bolt). With the development of technology, especially the emergence of a new generation of small satellites, the problem of shock and pollution caused by explosive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B64G1/64F42B15/36
Inventor 张小勇闫晓军黄大伟
Owner BEIHANG UNIV
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