Optimization Design Of Configuration Of Scissor Mechanism And Lifting Cylinder Of Scissor-type Overhead Working Truck

scissor-type overhead working truck is a high-altitude special equipment,which is widely used in indoor and outdoor vertical lifting works,for example the equipment maintenance,stations,docks,bridges,halls,plant indoor and outdoor mechanical installation and construction maintenance.The scissor mechanism and the lifting cylinder are the most important parts of the scissor truck and their performance has a great influence on the performance of the whole truck and the operating capacity.In current,the domestic design and manufacturing methods are basically based on personal experience design and imitation of production.The traditional institutional analysis and design methods have been unable to meet the improvement of product performance,and there is a certain risk.In this paper,a 12-meter scissor-type overhead working truck is used as the research object.The finite element technique is used to optimize the scissor mechanism and the lifting cylinder’s configuration.Under the premise of realizing the function of the product,the design scheme of four kinds of scissor mechanism and lifting and discharging cylinder is put forward according to the original model,and the two-dimensional finite element model of different schemes is established by APDL language in ANSYS software.And the two-dimensional model is equal to the original model in quality and stiffness.Secondly,the two-dimensional design model of the four schemes is analyzed by ANSYS finite element analysis software.Based on the calculated results,The optimization of the design scheme is improved to reduce the thrust force of the lifting cylinder,and the stress state of the scissor mechanism is improved to determine the preferred design scheme.Then,the finite element model of the three-dimensional solid element of the scissor system is established and the finite element analysis is carried out to verify the correctness of the design results.Finally,the buckling analysis of the three-dimensional solid finite element model is carried out to study the buckling load and buckling shape of the scissor system.And the modal analysis is carried out to get the inherent frequency and formation of the scissor system,which can guide the structure improvement and use environment of the scissor system to avoid the damage to the machine.The research contents of this paper are of great practical significance to the design and production of the scissor and scaffolding of the scissor-type overhead working truck.The reasonable and optimized design scheme has been put into practical application and has achieved the desired effect,which improves the local buckling stability of the product,reduces the cylinder’s thrust force and improves the stress condition of the scissor mechanism,and achieves the purpose of improving the performance of the product.It has a certain guiding significance to the design and production of the scissor mechanism and the lifting cylinder’s configuration.