| After the disaster,the roads,bridges,electricity and other facilities of disaster areas have been damaged severely,which affected the disaster relief personnel and materials transport seriously.This paper designed a ready-packaged cable crane powered by hydraulic pressure,and the equipment is suitable for a variety of terrain and can be erected in a short time.The important exploration for cable crane used in the field of disaster rescue is the design idea of this paper,which opens up a new direction for the development of disaster rescue equipment in China.This paper determined the design index of the engine firstly,according to the condition of the disaster site.Based on the function of the cable crane to be realized,the scheme of whole machine is designed,the whole machine is divided into two parts,including tower system and cableway system.To achieve the function of the rapid erection,the detailed structural design of the supporting tower system and the cableway system is made,and the installation process of the supporting tower system and the cableway system is compiled.The three-dimensional model of the whole machine was established by Solidworks,and the 2D drawing of the whole machine was drawn with Auto CAD.In this paper,the static model of the bearing cable is established by using the parabola theory,the concentrated load and the distributed load borne by the bearing cable are calculated,the statics analysis for the bearing cable is carried out,and the locked coil wire rope for bearing cable is selected which meet the strength requirement.The motion trajectory of the cable car on the bearing cable is the important reference for the disaster relief scene,using MATLAB to simulate the trajectory of the car in a variety of states.The nonlinear statics analysis for bearing cable is carried out by the finite element analysis software ANSYS,and the correctness of the parabolic theory is verified.The structural dynamic analysis for bearing cable is carried out in the working condition and the non-working state,the in-plane and out-of-plane vibration characteristics of the bearing cable in the non-working state are analyzed,and the in-plane vibration characteristics of the bearing cable under the working condition are analyzed,the relationship between the position and the load of the car and the vibration characteristics of the bearing cable is obtained.The dynamic model of bearing cable was established by Adams software,and three kinds of typical working conditions are simulated,the tension curve of the bearing cable and the vibration curve of the car are obtained.The structural statics and dynamics of the tower system are calculated by finite element method.The wind load borne by the tower system is calculated according to the working conditions.A finite element model of the support tower is established by using a variety of elements with ANSYS.The optimal design of the support tower system is carried out according to the arrangement layer number and position of the cable wind ropes,and the arrangement scheme of the cable wind ropes is determined.The prestress of the cable wind rope is calculated and the initial state of the mechanical analysis of the tower is obtained.The four kinds of working conditions of the supporting tower were selected to carry on the static analysis,and the support tower strength and deformation meet the design specification requirements.The four kinds of working conditions of the supporting tower are selected to carry on the static analysis,and the strength and deformation of the support tower all meet the design specification requirements.The global stability of the structure of the support tower and the stability of the single limbs are checked.The first eight order frequencies and modes of the support tower are calculated,and the vibration characteristics of the support tower are obtained.The resonant frequency of the support tower is obtained by the harmonic response analysis,and the variable load frequency of the bearing cable to support tower is compared,and the conclusion is drawn that the support tower does not resonate. |
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