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输送机外文文献及翻译和参考文献

更新时间:2010-6-13:  来源:毕业论文

输送机外文文献及翻译MENG You·fu QingruiHOU School and Electrical ofMechanical 221008China EngineeringChina University ofMiningTechnologyXuzhouJiangsu AbstractThe mechanism of a soft start is of in the of a clutch and its control hydro-viscous great importance design hydroviscous the mechanism of a soft startthe of a belt was systemTo explain hydroviscous startup process conveyor numerically analyzed with the and a effect of and modified Reynolds equationan energy equation temperatureviscosity equationThe temperature of the friction disk surface on load the oil film have also been results show grooves torque transfer and capacity of 毕业论文http://www.lwfree.cn/The tllat are the basis of reduce the of to a certain 1)the transfer extent grooves forming dynamic pressure butey may capacity torqae the little on and load variation in load of has effect transfer and the 2)during startup processtemperature torque capacity capacity the oil film is as of the feed very it is to use tlle flow rate a control object thanthe smallIndicating at preferable pressure cylinder ne results have been verified an by experiment clutchsoft startbelt transferload Key wordshydroviscous conveyortorque capacity studies on have been carried 1 Introduction tionMany engagement to the all of the stu— out up present¨“?But previous dies concentrated on charac— Belt are in cases the most largely speed regulating conveyors many of the on the tedsties clutchor iust cost—effective solution for bulk material in hydro—viscous handling of a wet clutchThe main issues are as mass flows over short and medium dis- engagement conveying the between nor- tancesWithgreat inertia and a short starting timethe followsinvestigating relationship mal and under the con— acceleration at the start will be speed very pressureOHtput torque greatconsidera- dition of a oil film thicknessor the side of beltif the given investigating bly affecting tight conveyor the between the oiI film is relationship thicknessoutput of the belt not startup process conveyor properly and under of the condition normal controlledAs a resultthe stress induced speed torque pres dynamic by sureFew studies on characteristics of tlliseffect several witll hydroviscous is increased timescompared starters have been soft carried outUnlike normal ensure reliable speed reg— operationTo operationthe ulation for fans or water in both should be pumpsdifferences of the belt increasedThus strength grade and in ofillm thickness rotational are the investment will be increased speed dynamic prophase greatly the entire the for development during startup processAt The soft starter is a solution this perfect problem rotational initial time of the diffe because itcan reduce total investment bv 20%.A startupthe speed hy is and the oil film is thickwhile at the end ence dro·-viscous soft starter has a large application good pros·· thin and the of the oil film is rota- the soft starters used at startup processthe pect among commonly tional difference is small-In load additionthe its is to elec— speed presentbecause performance superior of the oil film is also trical soft low to capacity developing dynamical- starters at and speed superior hy is not a to the draulic at lvObviouslyit good way investigate coupling high speed soft start under these conditions of oil film A soft process hydro..viscous starter(hydro..viscousclutch) the of thickness or normal is similar in structure to a wet clutchIt is based on pressureBecause pressure tIle feed should and to transfers the cylinder change dynamically Newton’s Law of and Viscosity power by load counterbalance the force of an oil to the Stri dynamically changing capac- shearing filmAccording the oil film to obtain different oil film thick of it、,of beck CHI Vethe the engagement hydroviscous transfer nesses at different load ca— clutch can be divided into three timestorqHe and stageshydrodynamic of the oil film are two lubrication and lubfica- pacity key parameters affecting lubricationmixed boundary 1340

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