Study On Cooperative Action System For Large Tower Lifting And Trailing

Large tower is one of the core contents and important equipment in chemical industry.It occupies an extremely important position in the fields of energy,resources,environmental protection,biology,new materials and other engineering fields.With the development of large tower technology,the tower scale gradually increases,and its internal process and equipment become more complex,resulting in the size and weight of the tower more and more large.It puts forward higher requirements for the hoisting construction of tower.At present,two cranes are used to complete the hoisting construction of tower crane.The method has limited load capacity and low motion precision,which is difficult to ensure the safety and stability of the construction.Therefore,the research of large load lifting and tailing cooperative action system has become an important technical requirement in the hoisting construction of large tower.In this paper,the large tower lifting and tailing coordinated action system is studied based on this demand.This paper analyzes the equipment structure and principle of hydraulic system of large tower lifting and trailing action,and defines the technical requirements of key issues,such as synchronization,coordination,stability.The scheme and principle of the hydraulic system are studied.The electro-hydraulic proportional valve is used as the executive component of the hydraulic system.The principle design and component calculation and selection of the hydraulic system are completed.And the mathematical model is established for hydraulic cylinder and electro-hydraulic proportional valve.The measurement system of large tower lifting and trailing action is studied,and automatic total station is used to measure the 3D coordinates of each lifting point and trailing point.The measuring principle of automatic total station is studied.And the performance parameters of the equipment are analyzed in detail.The influence of the swing of steel strand on displacement measurement is studied.With the algorithm,the error is compensated by the results of 3D coordinate measurement.Combined with the hydraulic system scheme,the coordinated control system of large tower lifting and trailing action is studied.The master-slave control strategy is adopted,and the PID neural network is used as the control core to complete the principle design of the control system.Combined with the actual example of large tower,its cooperative action process is analyzed in detail.The hardware network principle,module configuration,control software and monitoring software of the control system based on PLC are completed.The simulation model of hydraulic system is established in AMESim software,and the simulation model of control system is established in Matlab/Simulink software.The joint simulation interface module is set up to realize the mechanical-electronic-hydraulic joint simulation.The simulation is carried out under the average load condition and the offset load condition respectively,and through the simulation of ordinary PID control for comparison.The results show that this system has shown good stability in the average load and offset load conditions to meet the requirements of control accuracy.Compared to ordinary PID control,PID neural network has better adaptability to this system.