Performance Analysis And Condition Monitoring Of Packing Boxes For Mechanical And Electrical Products

With the rapid and stable development of China’s economy,the demand for mechanical and electrical products is also increasing rapidly.As an indispensable object in the transportation process of mechanical and electrical products,the packing box of this products undertakes the important task of protecting products from being damaged by external forces.The use of packing boxes has been paid more and more attention,and the research on the structure and performance of packing boxes is gradually increasing.At present,the structural performance analysis of the packing box of mechanical and electrical products is mostly based on the load stress state of the packing box in the static environment.However,the packing box is subjected to periodic vibration load for a long time because of the uneven road surface and other factors in the process of transportation.The resulting structural failure may lead to serious damage to the product.In order to solve this problem,this paper has carried out the research on the performance analysis and condition monitoring of the packing box of mechanical and electrical products.It provided a guarantee for the safety of mechanical and electrical products packaging boxes during transportation.It has important theoretical significance and practical value.The following main contents have been specifically completed:(1)The performance of the whole structure of the packing box of mechanical and electrical products under periodic vibration load was studied.First of all,taking the packing box product as a studied object,the three-dimensional solid model of the packing box was established by Solidworks software,and the model was meshed.Secondly,five kinds of stress conditions were designed to simulate the state of the packing box in the process of transportation,including one-sided force and multi-side force at the same time.Finally,based on the material parameters of wood beech,the parameters were set and analyzed in the finite element analysis software Abaqus.The performance of the packaging box under periodic vibration loads was obtained.The results showed that the bolted connection structure of the packing box is more prone to failure when subjected to lateral loads.(2)The loosening performance of bolted connection structure of packing box under transverse load was studied.Firstly,a fine mesh model of bolted connection structure with thread rising angle was established by using finite element analysis method.Secondly,the finite element analysis was carried out by Abaqus software.Finally,the contact state changes of thread contact surface and bolt head contact surface during loosening were studied by using the analysis results.The effects of various factors on the loosening performance were compared,including load amplitude,load frequency,load position,material properties.(3)The monitoring method of small angle of loosening of bolted connection of wood structure was studied by using machine vision technology.Firstly,different loose angle recognition schemes were designed.Then the monitoring model training was carried out,and the best angle recognition effect was obtained by comparing the results of different schemes.Secondly,the accuracy of the minimum loose angle recognition was tested.The results showed that the minimum recognition angle can reach 1 degree.Finally,the monitoring of bolt loosening angle in the case of multiple bolts was studied.The results showed that this method can monitor the loosening angle of multiple bolts at the same time.It showed that the implementation cost of this method is low,and it can achieve high-efficiency monitoring.