摘要我国煤炭中薄煤层储量丰富，对小功率采煤机的需求量也比较大。而炮采安全性比较低，生产率也比较低；综采对设备要求较高，而且投资费用比较大。所以对中薄煤层来说开发适应高档普采的采煤机是非常必要的，而MG300/700-WD型采煤机正是针对中薄煤层适应高普而进行的设计。MG300/700-WD型采煤机的截割部机械传动由三级直齿传动和一级行星机传动实现，且末级采用太阳轮浮动形式的行星传动。采取摇臂结构形式以增大滚筒的过煤空间进而提高装煤效率，并对各级齿轮及相应的传动轴进行了设计计算和相应的校核，结果满足设计要求。关键词：采煤机截割部行星机构AbstractInthepresentcoalmineofourcountry,thethinreservesofcoalseamarestillrich,arelargerforthedemandofthesmall-powermachineofcoalmining.Andcannonpicksafetycomparisonlittle,productivityisalsolow;Zongpickforequipmentrequirementhigher,andinvestmentcostiscompared.Soforinthincoalseamdevelopmentmeetthehighgeneralmachineofcoalminingisverynecessary.ThemachineofMG300/700-WDmodelofcoalminingonlyaimatinthincoalseammeetthehighgeneraldesignandthatgoeson.ThesectionofthemachineofMG300/700-WDmodelofcoalminingcutdepartmentmechanicaltransmissionfrom3leveldirectlytoothtransmissionandalevelplanetmachinetransmissionrealization,andendleveladoptstheplanettransmissionofthefloatingformofsungear.Adopttorockerarmconfigurationwiththecoalspaceofincreasecylinderandthenraisingpackcoalefficiency，Andfordifferentlevelsgearandcorrespondingpowertransmissionshaftdesigncalculationandcorrespondingschoolnucleus,asaresult,satisfydesignrequirement.Keywords：ShearerCoalcuttingpartPlanetorganization目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc169404385"1绪论PAGEREF_Toc169404385\h1HYPERLINK\l"_Toc169404386"1.1我国采煤机30多年的发展进程PAGEREF_Toc169404386\h1HYPERLINK\l"_Toc169404387"1.1.120世纪70年代是我国综合机械化采煤起步阶段PAGEREF_Toc169404387\h1HYPERLINK\l"_Toc169404388"1.1.220世纪80年代是我国采煤机发展的兴旺时期PAGEREF_Toc169404388\h1HYPERLINK\l"_Toc169404389"1.1.320世纪90年代至今是我国电牵引采煤机发展的时代PAGEREF_Toc169404389\h2HYPERLINK\l"_Toc169404390"1.2国际上电牵引采煤机的技术发展状况PAGEREF_Toc169404390\h3HYPERLINK\l"_Toc169404391"1.3国内电牵引采煤机的发展状况PAGEREF_Toc169404391\h4HYPERLINK\l"_Toc169404392"2总体方案的确定PAGEREF_Toc169404392\h5HYPERLINK\l"_Toc169404393"2.1MG300/700-WD型采煤机简介PAGEREF_Toc169404393\h5HYPERLINK\l"_Toc16940