Shape memory alloy driving actuator and driving method thereof

Abstract

The invention discloses a shape memory alloy driving actuator and a driving method thereof, and belongs to the technical field of actuators. The shape memory alloy driving actuator comprises a driving unit and a shell. The driving unit comprises two shape memory alloy rings, a shape memory alloy spring and a pin shaft. The two ends of the shape memory alloy spring are connected with the first shape memory alloy ring and the second shape memory alloy ring correspondingly, and the first shape memory alloy ring is connected with the pin shaft. The shape memory alloy rings and the shape memory alloy spring are each made of a dual-stroke shape memory alloy material. A plurality of grooves are evenly formed in the side wall of an inner cavity of the shell in the axial direction. According to the shape memory alloy driving actuator, timing sequence motion of the driving unit cooperates with locating of the grooves in the shell to drive the pin shaft to achieve telescopic motion. The shape memory alloy driving actuator has the beneficial effects of being large in driving force, large and controllable in displacement, simple in structure, capable of achieving reciprocating motion, low in cost, free of noise and magnetism, convenient to mount and the like and can be widely applied to electromechanical systems.

Description

technical field [0001] The invention belongs to the technical field of actuators, and in particular relates to an actuator driven by a shape memory alloy and a driving method thereof. Background technique [0002] At present, in electromechanical systems and weapon systems, the extension actuation of the pusher and the retraction actuation of the pin puller are two common types of actuators. The driving methods of the above two types of actuators are mainly motors. drive, electromagnetic drive and gunpowder drive, etc. Motor-driven and electromagnetic-driven actuators have problems such as complex structure, high price, and low efficiency of electrical-mechanical energy conversion. The gunpowder-driven actuator mainly uses the gas generated by the gunpowder combustion to drive the piston to do work. Due to the influence of factors such as structure, gas pressure transmission direction and sealing, in practical engineering applications, the gunpowder-driven actuator has low ...

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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a shape memory alloy-driven actuator and its driving method, which have large driving force and large displacement, and can be kept at any time even when the power is off In a certain state, it solves the technical problems of complex technical structure and low energy conversion efficiency existing in the existing motor drive, electromagnetic drive and gunpowder drive, as well as the small displacement of the shape memory alloy actuator, and the power failure case, the problem of not being able to stay in a certain state at all times

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