输送机外文文献及翻译MENG You·fu Qing—rui，HOU School and Electrical ofMechanical 221008，China Engineering，China University ofMining＆Technology，Xuzhou，Jiangsu Abstract：The mechanism of a soft start is of in the of a clutch and its control hydro-viscous great importance design hydro．viscous the mechanism of a soft start．the of a belt was system．To explain hydro．viscous startup process conveyor numerically analyzed with the and a effect of and modified Reynolds equation．an energy equation temperature—viscosity equation．The 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.youerw.com/The tllat are the basis of reduce the of to a certain 1)the transfer extent． grooves forming dynamic pressure but山ey may capacity torqae the little on and load variation in load of has effect transfer and the 2)during startup process，temperature torque capacity capacity the oil film is as of the feed very it is to use tlle flow rate a control object thanthe small．Indicating at preferable pressure cylinder． ne results have been verified an by experiment． clutch；soft start；belt transfer；load Key words：hydro．viscous conveyor；torque capacity studies on have been carried 1 Introduction tion．Many 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 clutch，or iust cost—effective solution for bulk material in hydro—viscous handling of a wet clutch．The main issues are as mass flows over short and medium dis- engagement conveying the between nor- tances．Withgreat inertia and a short starting time，the follows：investigating relationship mal and under the con— acceleration at the start will be speed very pressure，OHtput torque great，considera- dition of a oil film thickness．or the side of belt．if the given investigating bly affecting tight conveyor the between the oiI film is relationship thickness．output of the belt not startup process conveyor properly and under of the condition normal controlled．As a result，the stress induced speed torque pres— dynamic by sure．Few studies on characteristics of tlliseffect several witll hydro．viscous is increased times．compared starters have been soft carried out．Unlike normal ensure reliable speed reg— operation．To operation．the ulation for fans or water in both should be pumps．differences of the belt increased．Thus strength grade and in o订fillm thickness rotational are the investment will be increased． speed dynamic prophase greatly the entire the for development during startup process．At The soft starter is a solution this perfect problem rotational initial time of the diffe卜 because itcan reduce total investment bv 20％．A startup．the speed hy． is and the oil film is thick．while 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 process，the pect among commonly tional difference is small-In load addition，the its is to elec— speed present，because 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 lv．Obviously，it 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 clutch．It is based on pressure．Because 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 film．According the oil film to obtain different oil film thick． of it、，of beck CHI Ve．the the engagement hydro．viscous transfer nesses at different load ca— clutch can be divided into three times．torqHe and stages：hydrodynamic of the oil film are two lubrication and lubfica- pacity key parameters affecting lubrication，mixed boundary 1340