Balance Analysis And Lightweight Design For The Compression Mechanism Of Small Baler

The smoke from straw burning not only aggravates environmental pollution but also causes serious traffic accidents nearby.The traditional artificial collection of straw is time-consuming and laborious,which is the direct cause of straw burning.Therefore,the mechanical collection method needs to be used to replace the traditional way to solve the straw burning problem.A company has designed a small square straw baler,but this product has the problem of unbalance inertia force in the compression mechanism during the trial stage.This thesis mainly studies the dynamic balance of its compression mechanism.The specific research contents are as follows:Firstly,based on the overall structure and working principle of small square straw baler,it studied the influence of structural parameters of the baler on the compression performance,determined that the compression mechanism adopts the crank slider structure,determine the structural parameters of the crank slider mechanism,and verify the transmission mechanism of the compression mechanism.According to the functional requirements of the compression mechanism,it designed the specific structure of the crank,connecting rod and piston,and established the geometric model of the compression mechanism.Secondly,the dynamic simulation analysis of the compression mechanism is carried out,and the dynamic balance problem exists in the mechanism,and the load under the working condition of the compression mechanism is extracted for the subsequent analysis.Next,the finite element analysis model of crank,connecting rod and piston is established.Under certain constraints,the finite element model loads the extracted loads,performs a static analysis,and determines the optimization space for each component.In the case of keeping the component stress and displacement constant,the crank is optimized by topology and the piston is optimized by size.After optimization,the quality of the crank and piston was reduced by 46.51% and 17.31%,respectively.Next,the flywheel size was redesigned based on the partial balance method.In the case of the flywheel design principle,the structural parameters of the flywheel are taken as design variables so that the forces in the x-axis,y-axis and z-axis directions of the compression mechanism are minimized.Optimized flywheel structure is better to balance the inertial forces of the mechanism.Finally,the strength and stiffness of each component after optimizing are verified.The results show that the optimized mechanism meets the design requirements.In this thesis,it lightweights design of the compression mechanism and optimizes of the flywheel structure,which achieves the purpose of reducing the inertia force of the mechanism.