Jacking apparatus driven by shape memory alloy
A technology of memory alloy and jacking device, which is applied in the direction of fixing devices and mechanical equipment, and can solve the problems of not using shape memory alloy jacking device, large volume, and complex structure.
Inactive Publication Date: 2009-05-20
BEIHANG UNIV
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Problems solved by technology
This scheme uses the inflation device to inflate 60 metal bellows to achieve a high enough air pressure, and connects the magnetic levitation flywheel rotor and the stator as a whole to realize the jacking function, and the jacking can be released through the deflation valve; the jacking force of this scheme can be passed The air pressure is adjusted, and it has strong adaptability to the environment, but the top tightening time is too long, the structure is complex, and the volume is large
[0006] To the applicant's knowledge, there is no prior art jacking device utilizing shape memory alloy (SMA) actuation
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[0014] As far as the application of the present invention is concerned, the "shape memory characteristic" of a shape memory alloy (SMA) material means that the material is stretched and deformed at a certain low temperature, and its deformation cannot be fully restored after unloading, leaving residual deformation. However, as long as it is heated to a higher temperature, the residual deformation disappears and returns to the original unstretched shape, which is manifested as "memorizing the shape at a lower temperature", and a large amount of force is generated during the recovery process. Resilience.
[0015] In engineering, SMA wires and springs are usually combined to form a driving element, that is, the SMA wires and springs are connected to each other through a certain stretching deformation. Until the spring force is balanced with the yield force of the SMA wire and the output load; when the temperature rises, the SMA wire shrinks, and the restoring force of the SMA wir...
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The invention relates to a top tightening device driven by shape memory alloy. The top tightening device is characterized in that two sets of shape memory alloy (SMA)-spring drivers alternately actuate to complete the functions of the top tightening and the release of the top tightening of a structural piece, wherein a second SMA-spring is used for locking a first SMA-spring; when a second SMA wire is heated to relieve the locking, the first SMA-spring drives an elastic claw to tighten the structural piece through a double wedgy surface structure and balances high-load vibration from a plurality of directions through friction and self-locking; when the first SMA wire is electrified, the top tightening state is relieved; and the first SMA-spring reverts to an initial state and is locked by the second SMA-spring again, thereby completing one working circulation and making preparation for next actuation. The top tightening deice can bear the high-load vibration from the plurality of the directions and has repeated and rapid actuation, low power and high reliability.
Description
technical field [0001] The invention relates to a jacking device capable of bearing high loads from multiple directions and repeated actions. technical background [0002] For some structural components, a certain gap needs to be left in the working state, such as the magnetic levitation flywheel, there is a small gap between the magnetic bearing and the flywheel, and the magnetic bearing rotor is suspended by electromagnetic force during operation, which can control satellites very accurately. attitude, but in the non-working state, due to the existence of the gap, the magnetic bearing will be damaged by a large vibration load, so the gap needs to be eliminated; in addition, for some large-scale structural components, when the vibration load is applied, the Since load amplification will cause structural damage, it is also necessary to change its structural stiffness to avoid this situation. [0003] There are schemes to realize this type of top-tightening function in the p...
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IPC IPC(8): F16B1/04
Inventor 闫晓军于海张小勇聂景旭张辉
Owner BEIHANG UNIV