Design And Research Of Lifting Device For Maintenance Platform Of Tall Trees

With the rapid development of social economy and the acceleration of urbanization,the greening of roads and urban areas has become an important symbol of urban civilization.Some roads are planted with tall trees on both sides,and the maintenance work of tall trees has problems such as low efficiency,high labor intensity,and poor stability of the lifting device of the operating platform.Based on this,this article uses virtual prototyping technology and finite element analysis to simulate and optimize the lifting device of the working platform,and designs a lifting device suitable for the maintenance platform of the tall tree,so as to improve the operating efficiency and the stability of the device.The main content of the thesis research is as follows:(1)According to the requirements for the maintenance operations of tall trees,the overall design plan of the maintenance platform for tall trees was formulated.The lifting device is a key device for maintaining the working platform.By optimizing the back-push link enlarged lifting mechanism and closed groove-section sliding mechanism,the stability of the lifting device is improved while increasing the lateral rigidity of the mechanism;The truss platform uses a hidden support beam structure to achieve rapid separation from the chassis car.After the separation,the chassis car can be used as a transport vehicle to solve the problem of rapid cleaning of maintenance residues;the addition of a side climbing mechanism to achieve any position on the side of the operator climbing work.(2)Using the ADAMS software,a dynamic analysis of the lifting device was carried out to determine that the device at the starting position of lifting had the greatest force.In order to optimize its stress situation,a parametric multi-body dynamic model was built and compared with the original model under typical working conditions to verify the accuracy of the parametric model and provide a carrier for optimal design.Through sensitivity analysis,the optimal design variables are determined,and the minimum of the maximum sum of the unit mass bearing forces of the lifting mechanism of the lifting device is used as the objective function to evaluate the load-bearing efficiency for optimization,so that the force of each hinge point is reduced,of which the largest The force of articulation points JPRIM5 and JIONT7 decreased by 28.4 percent,which determined the optimal position parameters of the mechanism.(3)In the finite element software Hyper Mesh lifting mechanism of the lifting device before and after optimization of the mechanical properties,including strength,stiffness and modal analysis showed the largest decline of stress optimization mechanism 62.45 percent,the maximum deformation quantity optimization from 1.281 to 4.4mm,a drop of 70.88 percent,while satisfying the strength and stiffness requirements,the mechanism away from the natural frequency of the excitation source frequency,mechanical resonance does not occur,the optimized authentication improved lifting mechanism lifting apparatus stable to a certain extent.(4)Through the development of physical prototypes and operational performance tests.The results show that the lifting device runs smoothly during operation,without crawling,vibration and shock,and meets the requirements of maintenance operations.The research conclusion and method of this subject have certain theoretical reference significance and practical application value for the design and optimization of lifting device.