TextContentsshipunloader 卸船機(jī)grabshipunloader 抓斗卸船機(jī)chainbucketshipunloader 鏈斗卸船機(jī)suspensionchain-bucketshipunloader 懸鏈?zhǔn)芥湺沸洞瑱C(jī)en-masseshipunloader埋刮板卸船機(jī)bucketwheelunloader 斗輪卸船機(jī)pneumaticshipunloader 氣力卸船機(jī)

screwshipunloader 螺旋卸船機(jī)dual-beltshipunloader 雙帶式卸船機(jī)gantrygrabshipunloader 門座抓斗船機(jī)bridge-typegrabshipunloader 橋式抓斗卸船機(jī)buckethoistingmechanism 抓斗起升機(jī)構(gòu)closingdevice 閉合機(jī)構(gòu)self-propelled 自行式

wheelpressure 輪壓seaside 海側(cè)roadside路側(cè)shorelinetype 岸式floatingtype 浮式TextShipunloadersaremachineryusedtounloadships.Generallyspeaking,therearetwokindsofshipunloaders.Theyarecontinuoustypeandperiodictype.1Aperiodictypereferstograbshipunloaders.Whilethecontinuoustypeincludesmanykinds:chainbucketshipunloader,suspensionchainbucketshipunloader,en-masseshipunloader,bucketwheelunloader,pneumaticshipunloader,screwshipunloaderanddual-beltshipunloader.Themostwidelyusedshipunloaderisthegrabshipunloader.Thislessonisprimarilyconcernedwithgrabshipunloader,pneumaticshipunloaderandscrewshipunloader.Nowfirstlet’slookatgrabshipunloader.Generallyspeaking,therearetwokindsofgrabshipunloaders.Oneisthegantrygrabshipunloader;theotheristhebridge-typegrabshipunloader.Therewasasimilarconstructionbetweengantrygrabshipunloader(oftencalledgantrycranewithhopper)andgantrycrane.Thedifferenceisthereisahopperandbeltconveyoronthegantryforthegrabshipunloader.Bulkcargoisdischargedintothehopperbythegrabthentotheyardthroughthebeltconveyorwhileshipunloading.Theproductivityofgantrygrabshipunloaderishigherthanthecommongantrycrane.Andtheboomsystemhashigherstructuralstrength.TheproductivityofthegantrygrabshipunloadermadeinChinaisabout800t/hwhichismostlyusedforbulkcargoshippingworkatmediumandsmallports.Figure10-1showsthebridge-typegrabshipunloader.Thebridge-typegrabshipunloaderhasthesimilarbuckethoistingmechanism,closingdevice,travelingmechanismofthelargertravelerofmobilegantryandluffingmechanismwithcommoncrane.Besidesthosesimilarcomponents,bridge-typegrabbucketcranehasaspecialtrolleymechanism.Grabtrolleyhas3kinds:self-propelled,ropetowingtrolleyandhemi-ropetowingtrolley.Themaintechnicalparametersofbridge-typegrabbucketcraneare:liftingcapacity,productivity,outreachofgrab,liftingheightandworkingvelocity,span,wheelpressure(seasideandroadside),andwheelnumber(seasideandroadside).2Travelingmechanismofthetrolley,travelingmechanismofthelargertraveler,liftingmechanismofthegrab,pitchingmechanismoftheboom,grab,metallicstructure,maintrolley,reevingsystem,unloadingsystem,travelingmechanismofthetraveler,clamp,electroniccontrollingdevice,controlcabinandauxiliarytrolleyarethemainpartsofbridge-typegrabshipunloader.Thenlet’slookatthepneumaticshipunloader.Thepneumaticshipunloaderisoneofthepneumaticconveyingdevices.Infact,therearetwotypesofpneumaticshipunloader:shorelinetypeandfloatingtype.Shorelinetypeincludes:mobiletypeandfixedtype.Mobiletypecanbedividedintotracktypeandwheeltype.Thepneumaticshipunloaderoffixedtypeispneumaticconveyingequipment,whichisinstalledonthewharfofharbororstoragepointofbulk.Theyusemechanicalconveyingequipmenttotransportmaterialtosilo,bulkvehicle,andbulkjarbypositivepressure.Thescrewshipunloaderisconveyingequipmentonthebasisofspiralprinciple,whichisusedtoinstallonthewharfofharbororstoragepointofbulk.Itcanworkwithchainconveyor,spiralconveyor,airchute,andbucketelevator.Ⅰ.AnswerthefollowingquestionsinEnglish.1.Whatdoestheperiodictypereferto?2.Whatdoesthecontinuoustypeinclude?

Ⅱ.TranslatethefollowingEnglishsentencesintoChinese.1.Shipunloadersaremachineryusedtounloadships.Generallyspeaking,therearetwokindsofshipunloaders.Theyarecontinuoustypeandperiodictype.2.Whilethecontinuoustypeincludesmanykinds:chainbucketshipunloader,