Heat Balance Simulation And Analysis On Reduction Gear Box In Top-driven Hydraulic System Of Crust1

The successful implementation of SinoProbe has brought about the urgent needto develop the continental scientific drilling equipment with advanced technologythroughout the world and domestic. The successful development of Crust1drill rigwill be applied to scientific drilling, and the hydraulic top drive system is the core partof the deep drilling equipment. As the key part of the top drive system, the reductiongear box would have a significant influence on the normal operation of top drivesystem.The temperature distribution of top drive system is need to be analyzed ifresearching the heat gluing between the gear and bearing of the hydraulic top drivesystem, computing the thermal stress in components of gear box and principal axis,and analyzing the working principle of lubricating as well as cooling system of gear.Therefore, analyzing the temperature distribution is particularly important whiledesigning the fully hydraulic top drive system, which could provide a beneficialreference for controlling the lubrication and cooling of hydraulic top drive system. Inthe mean time, it could improve the working performance of the hydraulic top drivesystem.The computational formula of planar wall, recombination wall and cylinder bodyrelated to reduction gear box were derived on the basis of heat transfer theory in thisthesis. In addition, the computational formula of thermal resistance was established.The thermal source type in heat balance system of reduction gear box can beconfirmed by analyzing the lubricating and cooling system and the structure ofreduction gear box. Meanwhile, the power loss of gear and the bearing due to frictionwas analyzed with some emphasis according to the influence of different thermal power from thermal source on heat distribution, and the computational model ofworking power of gear and the bearing was built. In the same time, the thermalresistance of reduction gear box was sorted according to the heat transfer mode, heattransfer way and motion morphology of the reduction gear box, and the computationalformula of heat convection in the reduction gear box was simultaneously established.In this thesis, the model of reduction gear box was simplified, and the heattransfer way of thermal source in reduction gear box was analyzed. Moreover, theheat supply networks of heat balance system in reduction gear box were built whilethe viscosity variation model of lubricating oil was added. The steady temperaturedata of some important position is obtained by calculation. In addition, the influencefactor of thermal design power was obtained by detailedly analyzing the variation ruleof temperature and power in the key point at various working condition, which couldprovide the theoretical basis for the parametric design of heat-removal system inreduction gear box of the top drive system.The dynamic various heat resistance module was established by using theSimPowersystem model block in Matlab/Simulink, and the computational simulationinterface of the thermal power in reduction gear box of hydraulic top drive systemwas also built. What’s more, the temperature and thermal design power was resolvedin changeable parametric condition. In the end, the parametric design of thecalculation of thermal design power in reduction gear box of top drive system waseventually accomplished.In conclusion, the heat balance research of reduction gear box in fully hydraulictop drive system provide the reference for the design of hydraulic top drive systemaccording to the analysis of temperature distribution and thermal design distributionon key points, and it can theoretically demonstrate the reasonability of the lubricationand cooling system in reduction gear box. In hence, the parametric design ofreduction gear box provides a strong guarantee for the development of hydraulic topdrive system.