Telescoping actuator

Abstract

The invention discloses a telescoping actuator which is formed by orderly connecting multiple actuating units in series. Each actuating unit contains a housing, a heat-insulated sleeve, a spring, a push rod and a cover, wherein the housing is a cylinder with one end having an inner bore; the heat-insulated sleeve is arranged in the inner bore of the housing; the spring is a shape memory alloy spring and is arranged in the heat-insulated sleeve; the push rod is a ladder-like cylinder formed by a large cylinder and a small cylinder; the large cylinder extends into the sleeve to connect the spring; the small cylinder has an inner bore used as a housing of the next actuating unit; and the cover is used for sealing the end of the housing. Actuating displacement of the actuator is the sum of each actuating unit's actuating displacement, and response time of the actuator is the slowest response time among the actuating units. The actuator provided by the invention has advantages of large actuating displacement, fast response time, large driving force, simple structure, repeated use and high reliability.

Description

technical field [0001] The invention belongs to the technical field of actuators, in particular to a telescopic actuator. Background technique [0002] At present, in the electromechanical system, the pin pusher (extension actuation) and the pin puller (retraction actuation) are two common types of motion actuators, and the driving methods of the above two motion types of actuators are mainly Motor drive, electromagnetic drive, giant magnetostrictive drive and gunpowder drive. Motor-driven and electromagnetic-driven actuators have problems such as complex structures, high prices, and low electrical-mechanical energy conversion efficiency. Giant magnetostrictive drive has the problem of small drive displacement. The gunpowder-driven actuator mainly uses the gas generated by the gunpowder combustion to drive the piston to do work. Affected by factors such as structure, gas pressure transmission direction and sealing, in practical engineering applications, the gunpowder-drive...

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Problems solved by technology

Cheng Jinhong, Li Na, and Zhou Yuansong wrote the article "Research on the Application of Memory Alloy Restorable Insurance Mechanism" through the mechanism to energize the heating sheet, and the heating sheet heats the shape memory alloy spring to reach the reverse phase transition temperature. The shape memory alloy spring recovers and deforms, and the spring stretches. Long, drive the safety lever to move, when the power supply is stopped, the temperature of the shape memory alloy spring decreases, and the spring retracts to the original state without power. This scheme realizes a recoverable safety mechanism, but the response speed of the mechanism is slow and the driving displacement is small For details, please refer to the "Proceedings of the 17th Fuze Academic Annual Conference of the Chinese Ordnance Engineering Society"

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