Research On Key Technologies Of Hydraulic Scissors Lift&circumrotation Stage In Water

With the implementation of the construction and renovation of performance venues in China,the design and manufacture of performance equipment has entered a phase of rapid development.Many large-scale stage machinery design companies have emerged one after another in China,and the level of equipment manufacturing has been greatly improved,which has greatly shortened the gap with developed countries.Nowadays,the construction of various large-scale theme parks,reality shows,and program creativity combining with water culture have put forward many new requirements for the design of performance equipment,which resulting in the development of performance equipment towards high dynamic performance and high precision.The structure of stage machinery is becoming more and more complex,and its performance requirements are becoming more and more stringent.In this paper,hydraulic scissors lift&circumrotation stage working in water is taken as the research object,and mainly studies the key problems in the design process.Firstly,because the complete sets of equipment is working in water,the working table will inevitably be affected by water resistance,which will not only waste energy but also affect the movement of the lift.Therefore,it is necessary to predict the water resistance value of the lift in advance and design an optimization model which can effectively reduce the influence of water resistance.Based on simulation technology of CFD,the water resistance characteristics of scissors lifting are analyzed at different speeds.It includes establishing three-dimensional model,setting up fluid calculation domain,setting boundary conditions,choosing turbulence model and meshing.Then through the analysis of numerical results,the main source of water resistance is found,the results show that the water resistance mainly comes from the working table of the lifting platform.When the table rises at the fastest speed,the water resistance reaches30442.422 N.The original model was optimized and a porous model was designed to reduce the adverse effects of water resistance during the lifting process of the worktable.The numerical results of water resistance before and after optimization are compared and analyzed,the results show that the water resistance of porous model 2decreases by 9710.232 N compared with that of the original model when it rises at the fastest speed.Secondly,Simulation analysis on the the displacement,velocity and acceleration of the lifting platform is carried in ADAMS.The simulation results show that the piston thrust of the hydraulic cylinder and the pressure of the hydraulic cylinder on the shear beam are a pair of forces and reaction forces.According to the simulation results,the maximum thrust of the hydraulic cylinder is 164720 N,which is quite close to the theoretical calculation results.Then,the key parts of the scissors lifting are analyzed by finite element method to determine whether the strength and stiffness of the platform can meet the aperating requirements.On the premise of meeting the requirements of statics,the vibration performance of scissors element are studied.Finally,according to the intelligent control requirements of the equipment,the hardware part of the control system is designed.It includes comparing two kinds of displacement sensors which can be used for underwater displacement detection,and making the best choice between them;choosing and configuring the PLC reasonably,and completing the control system circuit design under the guidance of relevant technicians.