Pin puller based on memory alloy wire

Abstract

A pin puller based on a memory alloy wire comprises a pin, a housing, a pull rod, an ejection spring, a front insulating mat, a pull tray, a memory alloy wire, a PCB (printed circuit board), a rear cover and a service conductor, wherein two bonding pads of the PCB are conducted respectively, but not with each other; the pull rod is sleeved and fixedly connected with the front insulating mat and the pull tray; the two ends of the memory alloy wire are soldered and fixed with the PCB; the service conductor is welded on the service conductor bonding pad of the PCB and thrown out through an opening in the housing; the pull rod penetrates out of a waist-shaped hole in the housing; the pull rod is sleeved with the ejection spring; and the pin is inserted into the ejection spring and screwed into the pull rod. according to the pin puller, the problem of too small operation force of the memory alloy wire is solved by adopting the method of back-and-forth shuttling of the memory alloy wire between the pull tray and the PCB for many times; compared with the existing pin puller for an initiating explosive device, the pin puller has the advantages of low energy source requirements, large output pull and easiness in reliability and safety guarantee.

Description

technical field [0001] The invention relates to a pin puller product, in particular to a pin puller based on memory alloy wire. Background technique [0002] As a new type of intelligent material, memory alloy has the characteristics of shape memory. It is forced to deform below a specific phase transition temperature. When the temperature rises above the phase transition temperature, the memory alloy can restore its original shape. This feature of the memory alloy has good application value, and has been widely used in the fields of civilian toys, robots and aviation. [0003] When used as an operating element, the memory alloy wire generally has the following two ways of use. One is to make the memory alloy wire into a coil spring and heat it by direct electricity or hot water or hot air to deform it. The feature is that the heating is simple and the stroke is large, but the working power is very small, generally no more than a few cows; the second is to directly stretch ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is: to overcome the deficiencies in the prior art, provide a pin puller based on memory alloy wire, solve the problem that the memory alloy wire is too small in power, and the memory alloy rod is difficult to heat, so that the present invention can pull out the pin. The pin puller can be directly energized for heating, the requirements for energizing current and energizing time are low, and the power for pulling out the pin is large. At the same time, the reliability and practicability of the pin puller of the present invention are also improved.

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