| With the continuous development of modern war battlefield situation,the trend of automatic weapons from manual control to vehicle,shipboard,airborne and other platform control is more and more obvious.As a kind of external energy weapon,chain machine gun has been paid attention to all over the world for its simple structure,light weight,controllable firing rate,high maximum firing rate,high reliability and high precision.In this paper,14.5mm chain machine gun external energy supply technology is taken as the research object,and three aspects are studied: from the scheme design of the ammunition feeding mechanism,the model is established;the scheme design and model establishment of the transmission mechanism;the dynamic simulation of the ammunition feeding system and the strength analysis of the parts,the main achievements are as follows:Combined with the ammunition feeding requirements of 14.5mm chain machine gun,the scheme design of belt,ammunition moving mechanism,ammunition conveying mechanism and is carried out.Through UG software,the 3D models of the designed belt,ammunition feeding mechanism and eject shell mechanism are established.The designed belt is simplified as a cantilever beam with rectangular section,and the pull-off-force is analyzed by theoretical analysis method.The analysis results show that the pull-off-force of the designed belt is appropriate,and the design of the belt is reasonable.In order to coordinate the movement of the ammunition moving wheel and the ammunition conveying wheel,ensure the continuous rotation of the ammunition moving wheel and the intermittent rotation of the ammunition conveying wheel,and not interfere with the reciprocating motion of the bolt,a cylindrical cam intermittent mechanism is designed.According to the working principle of chain machine gun,two suitable motion laws of quintic polynomial and cycloid are selected for the follower,and the corresponding cam contour and cylindrical cam are designed through theoretical calculation.Different cylindrical cams are compared by ADAMS simulation analysis,and the cylindrical cam with the best mechanical performance is selected.The transmission mechanism and ammunition box are designed for the ammunition feeding system.Finally,the 3D model of the whole ammunition feeding system is established by using UG software.The established 3D model of the ammunition feeding system is imported into the software ADAMS.After defining the material,constraint,drive and contact,under the condition of 800 rounds/min through dynamic analysis,the motion attitude and force characteristics of the ammunition in the process of ammunition feeding are obtained,and the rationality of the designed ammunition feeding system is verified by combining the motion and force of each part.The simulation results show that the motion characteristics of the bullet and the parts participating in the ammunition feeding are consistent with the expected results,the ammunition feeding process is stable,the collision is small,and the designed ammunition feeding system can complete the ammunition feeding task under different firing rate.At the same time,the dynamic simulation of the eject shell mechanism is carried out,and the displacement,velocity and force of the shell in the process of shell throwing are obtained.The simulation results prove the feasibility and reliability of the designed eject shell mechanism.The feeding system are imported into the ANSYS.The material and constraints are defined.The stress and other boundary conditions obtained in the dynamic simulation analysis are loaded.The strength is checked,and the stress and deformation map of each part is obtained.The simulation results prove that the strength of the key parts is enough.In this paper,the design and analysis of the external energy feeding system of 14.5mm chain machine gun are carried out,which can provide some reference for the design and research of similar external energy supply system. |
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