Structural Design And Optimization Of Automatic Stacking And Loading Machine For Bagged Materials

In recent years,with the rapid development of production industries such as chemical,grain,and feed,as well as logistics transportation in China,bagged materials have become the main packaging method for their production,storage,and logistics transportation.The stacking and loading process is one of the important links in industrial production and transportation.At present,the palletizing and loading of bagged materials on the domestic market in China mostly rely on manual or semi-automatic loading machinery.This loading method not only has high labor intensity and labor costs for workers,but also the health problems of workers caused by the harsh loading environment are not guaranteed.Some developed countries abroad have developed mature industrial machinery products for automatic palletizing and loading trucks in response to the situation of industry production and transportation.Due to certain differences in transportation vehicle standards between domestic and foreign countries,the applicability of foreign equipment to domestic transportation vehicles is poor.Therefore,this article studies the stacking and loading process of existing bagged materials and other products,and designs a structure of a mobile truss type automatic bagged material stacking and loading machine.It is mainly designed for loading bagged materials on large semitrailer trucks in China,and the specific research content includes:(1)Firstly,based on the needs of the enterprise,actual production,and workflow,the overall working environment and content of the palletizing and loading machine are determined,and a mobile truss type automatic palletizing and loading machine for bagged materials is proposed.The structure of each part is designed and calculated,and the entire palletizing and loading machine is modeled and designed using Solid Works 3D modeling software.The automatic stacking and loading machine for bagged materials designed in this article is mainly composed of a mobile truss mechanism,a double grasping robotic arm device,a grasping chassis and lifting mechanism,and a bagged material conveying mechanism.The focus is on completing the design and research of the mobile truss mechanism and the grasping chassis lifting mechanism.(2)Based on the three-dimensional model constructed for the stacking and loading machine,a virtual prototype of the stacking and loading machine is established using ADAMS software,and the movement simulation of bagged material stacking and loading is performed on it.By analyzing the simulation results,the displacement,velocity,and acceleration of the bagged material during the entire motion simulation process,as well as the load and power consumption curves of each moving component on the stacker loader,are obtained.By viewing the simulation results and comparing the curves,the feasibility of the structural design of the stacker loader is verified,providing theoretical reference for the subsequent design and improvement of the stacker loader.(3)Taking the mobile truss and mobile lifting bracket on the automatic stacking and loading machine for bagged materials as the research object,according to the stress conditions of the automatic stacking and loading machine for bagged materials under different working conditions,the finite element statics and modal analysis of the mobile truss and mobile lifting bracket on the automatic stacking and loading machine for bagged materials under different working conditions were carried out using the ANSYS workbench finite element analysis software,The equivalent stress and total deformation analysis of the mobile truss and mobile lifting bracket under different working conditions,as well as the natural frequencies of the first six modes and their corresponding vibration mode clouds,were obtained,and their stiffness and strength performance were verified.At the same time,the resonance phenomenon between the mobile truss and mobile lifting bracket and the excitation source on the stacking and loading machine was verified during operation.This provides a theoretical basis for the subsequent improvement and optimization of the stacking and loading machine,as well as for the manufacturing of the entire machine.(4)Based on the structural optimization design theory,according to the finite element statics and modal analysis results of the mobile truss and mobile lifting bracket,the mobile truss and mobile lifting bracket are optimized respectively.Use the multi-objective size optimization design method of response surface to optimize the cross-sectional wall thickness dimensions of rectangular structural steel sections on mobile trusses.Under the conditions of meeting the strength and stiffness of the mobile truss,the total mass of the mobile truss was reduced by23.64% compared to the total mass before size optimization;Using the topology optimization design method,the overall structure of the mobile lifting bracket was topology optimization,and part of the structure of the mobile lifting bracket was removed and improved,so that the overall quality of the mobile lifting bracket was reduced compared with that before optimization,and its dynamic characteristics were optimized and improved.By optimizing the structure design of the stacker loader,the goal of lightweight has been achieved,and the overall working performance of the stacker loader has been improved.