A flexible and bendable shape memory alloy actuator

Abstract

The invention relates to a flexible and bendable shape-memory alloy driver. The shape-memory alloy wire is used as a driving element, which shrinks when energized and heated, and elongates when cooled to realize the output of the displacement and force of the driver. The driver is composed of a driving end, a flexible helical sleeve and a fixed end; the shape memory alloy wire is placed inside the bendable helical sleeve, one end of the memory alloy wire is rigidly connected to the output shaft, and the other end is connected to the fixed end cover; The driving end has a built-in bias spring, whose function is to assist the elongation of the memory alloy wire during the cooling process. The driver is small in size, light in weight, simple and reliable in structure, adjustable in output force and displacement, can be bent according to a certain curvature, and is easy to install and integrate with external mechanisms.

Description

technical field [0001] The invention relates to a driving device, in particular to a flexible and bendable shape memory alloy driver. Background technique [0002] The traditional electromagnetic driver has a large volume, complex structure, high manufacturing and processing costs, and is prone to electromagnetic interference, so its application field is greatly limited. The main principle of the commonly used shape memory alloy linear actuator is to use the temperature to control the transformation between the low temperature phase martensite and the high temperature phase austenite of the shape memory alloy wire to realize the output of the actuator force and displacement. When the alloy is in the low-temperature martensitic phase, the alloy is soft, showing good ductility and stretchability. When heated to a certain temperature, the stretched alloy begins to shrink and transform into austenite. Form the output force and displacement. The output displacement of the shape...

AI Technical Summary

Problems solved by technology

[0004] The first object of the present invention is to solve the problem that the traditional electromagnetic linear drive converts the rotational motion of the motor into linear motion through devices such as worm gears or racks and pinions. Small size, low integration, complex structure, and inconvenient adjustment parameters

[0005] The second object of the present invention is to solve the problem that the existing shape memory alloy linear actuator usually adopts segmented superimposition to increase the output displacement of the driver in order to reduce the size and volume, but the segmented shape memory alloy wire must be connected through an additional mechanism , which makes the structure complex, difficult to manufacture, and the volume size cannot be further reduced

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