Research On Hoisting System Of Hydraulic Automatic Catwalk

Automatic Catwalk is picturesquely designated as Power Catwalk, the main functionof which is to complete the transit of drilling tools such as dril-pipe, drill-collar and so onbetween the ground and drilling platform. On the one hand, it can obviously reduce laborintensity and make drillers away from dangerous work area to enhance safety. On the otherhand, it can efficiently raise the drilling efficiency and automatic operation level of drillingtool.At present, there are three type automatic catwalks for deep continental scientificdrilling project, which are wire-rope lifting catwalk, hydraulics lifting catwalk and thesystem of robot arm. The feature of wire-rope lifting catwalk is big output power and longtransmission but its transmission accuracy is worse. Obvious vibration and dynamic impactload on the catwalk could be caused by some factors including elastic stretching feature ofwire rope and the self-excited vibration of that, by which the stability and reliability of thecatwalk could be seriously affected. The lift height of hydraulics lifting catwalk would belimited because of some factors such as loading capacity and stability of piston rod, so itcan adapt low-height drilling platform. With a high degree of automation, the pipe handlingability is great, but the structure of that is complex and high accuracy of componentmanufacture is needed.The paper comes from the project of Ministry of Land and resource---key equipmentdevelopment of deep exploration and experiment(project number: SinoProbe-09-05)，theaim of which is to design a hydraulic automatic catwalk as the peripheral equipment ofdeep drilling rig. It is required that terrestrial scientific drilling depth is10000meters，therefore，the height of drilling platform needed is12.5meters. Three above-mentionedtypes of catwalk cannot meet the requirement of deep drilling for10000meters，so a newautomatic catwalk device is needed to be developed.The corresponding study is given to the hoisting system of hydraulic automaticcatwalk in paper, the main contents of which include five aspects: mechanical structuredesign, kinematics analysis and dynamics analysis, analysis of performance parameters, dynamic simulation and finite element analysis of key parts. Concrete contents areformulated as follow.First, research development of domestic and foreign catwalk is summarized and thecontent and significance are analyzed in this paper. Based on functional requirement andadverse working conditions of the lifting system, integral structural scheme of the system isdetermined finally. Structure components and working principle are discussed in detail. Thethree dimensional model of the system is created based on Solidworks.Second, kinematics analysis and dynamics analysis are completed for the hoistingsystem so that the relevant dynamics parameter equations of that are obtained, which aresolved by mechanical dynamic sequence-solution method and will directly offer referencedata for the design of the hoisting system.Third, Virtual prototype model of hoisting system has been created. Dynamicssimulation of the lifting system based on ADAMS has been finished, which can be used toverify whether the design is reasonable and offer reference data for structure optimizationof the system.Finally, deformation analysis and stress analysis of key parts are given to the liftingsystem by FEA software，which can offer valuable references for optimal Structure of thelifting system.