Design And Research Of A Noise Reduction Pin Puller

The pin puller is a new type of mechanical power driven pyrotechnical device which combines the electric ignition tube and mechanical motion mechanism.It is small in size,light in weight,safe and reliable,and has been widely used in aerospace and underwater unlocking devices.As the future battlefield environment more severe,dexterity and concealment is bound to become the important factors affecting the future battlefield,and the traditional piston pin pull pull pin in the process of using high pressure gas produced by the charge to cut off the weak links the piston to do work,when to cut off the weak link tend to produce bigger noise and shock,so increased the probability of some equipment in use process were detected,In order to avoid this problem,it is very important to develop low impact and low noise pin puller,which will have a profound impact on improving the operational performance of weapon system.The main research contents of this paper are as follows:First,a noise reduction pin puller based on shape memory alloy is designed to meet the application requirements of low noise explosive materials used in underwater weapons.According to the design principle of pyrotechnic device,the structure of noise reduction pin is designed,including spring,memory alloy and ignition tube.This structure uses the shape memory effect of memory alloy to take the place of the conventional way of using high pressure gas to cut off the safety pin of explosive products,without violent explosive,and realizes the pin drawing without flying pieces,low impact and low noise.Second,according to the function principle of the pin puller,summarizes the piston type pin puller action noise source,and according to the cause of the noise,find the method to reduce the noise,so as to complete the design of noise reduction pin puller.The core component of the pin puller is the shape memory alloy tube.The phase change temperature of the selected memory alloy material is tested by DSC tester,which proves that the selected memory alloy material meets the requirements.The structure of the memory alloy was designed,and the memory alloy samples were tested by water bath,and the maximum diameter shrinkage rate of the memory alloy after reaching the phase transformation temperature was 3%,which met the requirements of design and use.Third,after the design of noise reduction pin puller is completed,in order to evaluate its comprehensive performance,environmental adaptability,ground noise performance and underwater noise performance are tested respectively.The test results show that the pin puller can operate reliably and have strong adaptability in a variety of complex environments.The noise peak value is far less than 150 d B and the action noise is small,which can meet the requirements of underwater weapons for low-noise explosive products.