Brake cable type shape memory alloy driver

Abstract

The invention provides a brake cable type shape memory alloy driver. An inner core is a shape memory alloy wire; a molybdenum disulfide coating coats the surface of the shape memory alloy wire; a polytetrafluoroethylene tube and a metal spiral hose sequentially wrap the molybdenum disulfide coating from inside to outside; a protecting layer of an outermost side of the shape memory alloy wire is a rubber tube; one end of the shape memory alloy wire is fixed on a mounting base; the other end of the shape memory alloy wire is connected with an actuating contact; two ends of the driver are fixed through the mounting base and a clamping seat; a bias spring is arranged between the clamping seat and the actuating contact; the shape memory alloy wire is lengthened for a certain distance before being mounted; after the driver is electrified and heated, the shape memory alloy wire generates a restoring force and restoring displacement owing to phase change; the restoring force acting on the actuating contact is greater than elasticity of the bias spring, and the actuating contact is driven to move; and after actuation is finished, current is switched off, the shape memory alloy wire is lengthened again under the effect of the elasticity of the bias spring, and repeated actuation of the driver is realized. The brake cable type shape memory alloy driver is simple in structure and high in actuation speed, is convenient during driving and can be used for triggering devices or driving devices in various fields.

Description

technical field [0001] The invention relates to the technical field of a shape memory alloy driver, in particular to a gate wire type shape memory alloy driver. Background technique [0002] Shape memory alloys (SMA for short) is a new type of intelligent material, which has shape memory effect, superelastic effect and high power-to-weight ratio, and has been used as the driving element of the driver in aviation, aerospace, medical treatment, etc. field has been widely used. [0003] The driver using the shape memory alloy wire generally elongates the shape memory alloy wire, constrains the shape memory alloy wire by mechanical means, and then heats the shape memory alloy wire. Due to the internal phase change, the shape memory alloy wire returns to its original state. The length of , showing shape memory effect, will generate a certain restoring force in the case of restraint at both ends. Due to certain difficulties in the installation, fixation and insulation of the sha...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of complicated structure of the current shape memory alloy driver, the present invention provides a brake line type shape memory alloy driver

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