Patulous self-furling memory alloy lock-release device

Abstract

The invention discloses a spreading type self-furling memory alloy unlocking device used for a spacecraft, which consists of an arch locking wire subassembly (1), a stop (2), a lock body (3), a compression spring (4), a lifting arm (8), a connecting rod (9) and a releasing device; the arch bottom of the camber locking wire subassembly (1) is fixed at the front end of the lock body (3), the stop (2) is arranged on the arch locking wire subassembly (1), the connecting rod (9) inserts into an inner cavity at the front end of the lock body (3) after being connected with the stop (2); the connecting rod (9) passes through the rear end of the lock body (3) and is connected with the lifting arm (8), the lifting arm (8) tightly presses the compression spring (4) in the lock body (3); the releasing device is clamped at the rear end of the lock body (3) by a connecting part fixed on the lifting arm (8). The memory alloy locking wire provided by the invention adopts an arch spread mode, thus reducing the diameter and the length of the alloy wire, also the size is small and the unlocking time is short; furthermore, the unlocking purpose can be realized after stretching at any side, the reliability is high and the invention can be used for various spacecrafts.

Description

technical field [0001] The invention relates to a memory alloy unlocker for space vehicles, in particular to a small-sized open-type self-folding memory alloy unlocker used for the separation of star arrows and stars. Background technique [0002] A space release mechanism is essential for every space vehicle. Pyrocutters or explosive bolts commonly used in space vehicles can be unlocked within tens of milliseconds, but their complex structure, large size, impact load of more than 4000g, and high risk of electrostatic explosion have certain limitations in use. For those occasions that do not need to separate two or more objects at a precise moment, such as various deployment mechanisms of space vehicles and other micro-moving elements, pyrotechnics are not a suitable unlocking power source. [0003] Ti-Ni shape memory alloy has peculiar memory performance and superelasticity, and its martensitic state is relatively soft, which can be easily cold deformed. After heating, it ...

AI Technical Summary

Problems solved by technology

The memory alloy wire of this mechanism is long and circularly coiled, which is likely to cause uneven heating and excessive local heat. It is necessary to require a tension in the axial direction of the released object. The connection of the screw mechanism is still one of the fatal failure modes of the mechanism. one

[0006] The existing memory alloy unlocking method is mainly through the axial contraction and deformation of the memory alloy. Due to the large stroke and large axial deformation, the memory alloy wire must be thicker and longer, so the size of the releaser must be increased. , longer heating time

At the same time, due to the axial shrinkage of the memory alloy, a certain gap must be reserved between the alloy wire and the heating part on it to ensure relative movement, so the heating time is also increased

With the development of large satellites and small satellites, especially the emergence of micro-satellites and nano-satellites, the weight of satellites is 100kg, 50kg, and 10kg. The original releaser is too large in size and heavy in weight. The heating time is too long and the use is limited. When the stars are separated, it will directly affect the accuracy of the micro-satellite's orbiting

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