落潮井

couplingunitsandlandinggears
couplingunitsnormallyincludefifthwheelandpintlehooker,bothusedtoconnectthetruckandtractortotrailersorsemi-trailer.
Whenwesayconnection,weactullyreferthesocalled"quickconnectionandrelease"mechainism.Thiskindofdevicenormallyrequirequicklyconnectordisconnect(maybecoupleseconds?)whileatthesametime,totallysealtheconnectingandconectedunits.
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