Memory metal pin pusher

Abstract

The invention provides a memory metal pin pusher. In the initial stable state, the driving spring is completely compressed, the balls keep balance among the sliding sleeve, the retainer and the sliding pin, the sliding pin is restrained by the balls to keep stable, and the functional part is shrunk in the retainer; when external work is needed, the SMA wire is electrified to be heated and contracted to drive the sliding sleeve to move upwards, the ball loses balance to relieve limiting on the sliding pin, the driving spring drives the sliding pin to move upwards, and the functional part stretches out of the retainer to do external work. When resetting is needed, the functional part and the sliding pin are pushed back to the retainer, the reset spring pushes the sliding sleeve to move downwards, the sliding pin, the balls and the sliding sleeve enter the balance state again, and resetting of the pin pusher is completed. The device has the characteristics of high matching precision, high bearing capacity, smooth promotion process, high reliability and closed-loop control in the promotion process; controllable driving of scenes such as structure limiting, fluid release, lock hook separation, rope cutting, pipeline connection and disconnection and controlled rotation can be achieved by adopting different functional parts.

Description

technical field [0001] The invention relates to the technical field of drives, in particular to a pusher driven by memory metal. Background technique [0002] The pusher is a kind of driving device, its actuating element shrinks inside the pusher in the initial stable state, when necessary, the driving element pushes the actuating element out to do work, so as to realize structural limit, fluid release, lock hook disengagement, rope Controllable driving of scenes such as cutting, pipeline on-off, controlled rotation, etc. The existing technology mainly uses electromagnetic drive, pyrotechnic drive, hydraulic drive, pneumatic drive and other methods to realize the above functions, but this kind of drive generally has the disadvantages of complex structure, large volume and heavy weight, and is obviously not suitable for use in small spaces. Controlled drives, especially in the aerospace field where there are strict requirements on size and weight, the use is limited. Conte...

AI Technical Summary

Problems solved by technology

The existing technology mainly uses electromagnetic drive, pyrotechnic drive, hydraulic drive, pneumatic drive and other methods to realize the above functions, but this kind of drive generally has the disadvantages of complex structure, large volume and heavy weight, and is obviously not suitable for use in small spaces. Controlled drives, especially in the aerospace field where there are strict requirements on size and weight, the use is limited

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