Finite Element Analysis And Structure Optimization Of Key Components On The Towing Machine For Cable

With the development of economy, all kinds of industry had an increasing demand forelectricity power, especially the manufacturing industry, but the grid construction didn’t matchthe electricity demand, as a result. In order to break the situation of grid construction hysteresis,a series projects of regional grid construction, grid expansion and extra-high voltage power lineconstruction for electricity power transmission were carried on. Tension stringing was the mainform of transmission line construction of grid, and towing machine for cable is the keyequipment of tension stringing.The pull of wire rope was the main load that towing machine for cable suffering fromwhen the towing work was being done, and the pull was mainly sustained by drums and frame,so their mechanical properties were an important reflection of the design level. For now, theresearch data about towing machine are very rare in the domestic. This paper took drums andframe on ZXZ90towing machine for cable as the research objects, and the main research workwere shown below:(1) According to the work requirements of drums and frame which were key componentsof the towing machine for cable, based on the main research situation of similar parts at homeand abroad, theoretical calculation of strength, finite element analysis and structureimprovement of drums and frame were determined as the main research content.(2) Taking the tension of wire rope winding dual-friction drums as entry point, stress anddeformation mechanism of towing drum were intensively studied. Firstly, taking the wire ropewinding drums as research object, the function of wire rope tension between inlet and outletwas obtained by means of combing calculus with mechanics. And on this basis, generaldeformation equation of unit beam of drum wall was obtained by doing research to thedeformation state of axial section under pressure and radial section under bending moment.Combing with and assembly structure of towing drums, hinge unit beam model of drum wallwas established. After analyzing the stress state of small units in drum wall and applying thethird strength theory, mechanical calculation model of unit beam was established for drum wall.(3) According to the variation rule of drum load, based on the maximum load of wirerope, finite element analysis model of drum was established by ANSYS, analysis works was done, the stress and deformation situation of stress was explored, dangerous work area ofdrum was found, mechanical security of drum was verified. After comparing finite elementanalysis result with theoretical result, the phenomenon of value gap was analyzed and thesimulation of improved structure was done; the theory just outlined was verified to be correct,and theoretical basis was provided for optimum design of drum.(4) Taking the weight of drum as objective function, the diameter of groove bottom, wallthickness and groove number as design variables, the design requirements and the operatingrequirements as constraints, optimum design mathematic model of drum was established. Thestructure parameters of drum were optimized by MATLAB, and the theoretical optimal valueswas obtained. The optimum design values of drum were gotten by combing with the practicalassembly, and the weight reduced of16.5%.Based on this, finite element simulation analysiswas done to the result of optimum design, it showed that the optimization results met theperformance requirements, and a new idea was provided for design of friction drum parts.(5) Structure characteristics of frame on towing machine was analyzed. Based on shellelement as the meshing type, finite element face geometry model was established. The forms ofloading on different condition were studied, it is confirmed that drum was simplified as thekey point on towing condition, and then the load was transmitted by rigid connection which gotkey point and frame connected together; the frame was applied with concentrated load onbending conditions and bending and twisting conditions, and the load was applied tocentre-of-gravity position of parts; based on the safety performance on different conditionsverified by finite element analysis, the structure improvement advice was proposed for frame.