Finite Element Analysis Of Lifting Mechanism On Bulk Grain In And Out Of The Warehouse Equipment

Currently, there are many problems in the process of grain warehousing, such as highcrushing rate, Automatic grading seriously, large dust concentration, which has become ahot issue. Aim to these problems, people had some improvement for grain warehousingequipment, but the effect is still not significant. In this paper, aim to these existing problems,we propose a new equipment, namely scissor lift equipment, through the pneumatic cylinderto achieve lift function. It can effectively alleviate the automatic grading phenomenon ofgrain and impurities, reducing grain crushing rate.In this paper，by means of this Multi-body Dynamics software ADAMS and FiniteElement Analysis software HYPERWORKS, using the Dynamic Simulation and FiniteElement Method, we make analysis of the dynamics, statics and modal of the scissor lift,which provide some scientific basis for the actual design.(1) According to the dynamics theory, we construct dynamic equation in the process offalling grain, deduces the relationship equation between the lower depths and rotationalspeed of grain speeder, simulates the grain grading process by MATLAB software, whichcan be more clearly illustrate the necessity of studying the scissor lift; through the analysisof structural features and the forces of the scissor lift, we deduce mechanical models of eachhinge pin, calculate the maximum thrust of pneumatic cylinder by virtual work principle,which provides a theoretical basis for the subsequent simulation analysis.(2) Building geometric model of scissor lifting mechanism by three-dimensional solidmodeling software Pro/E, using the Multi-body Dynamics Simulation Software ADAMS,we implement the motional simulating analysis for the scissor lift, which can be obtainedsome curves in the process of scissor lifting mechanism motion, such as the lifting platformcentroid displacement curve, centroid velocity curve, and the force curves of the hinge pin.Through the analysis of displacement and velocity curve to determine the cause offluctuations in the platform, slight fluctuation has little impact on the lifting mechanism,within the normal range. Through the analysis of the force curves of each hinge pin, itfurther verifies the accuracy of theoretical calculation, and provides a basis for analyzingdynamics for the next step. (3) Static analysis is made on the scissor lift mechanism, and the results showmaximum stress occurs on the supporting base which connected with the pneumaticcylinder. The maximum stress value is58.87MPa, less than the limit of the yield of material,which proves the reliability of the structure. Meanwhile, we make modal analysis for scissorlift bodies, and extract the first ten order natural vibration modes, which provide somepractical basis for the design of the scissor lift mechanism.