资源预览需要最新版本的Flash Player支持。
您尚未安装或版本过低,建议您
英文原文POWEREDSUPPORTSPOWEREDROOFSUPPORTSAREUSEDTOSUPPORTTHEROOFATTHEFACETHEYWORKINSEVERALSTEPSMOSTLYINTHEIMMEDIATEFORWARDSUPPORTIFSTYPEINORDERTOSUPPORTTHENEWLYEXPOSEDROOFASSOONASPOSSIBLEINNORMALSUPPORTINGCONDITIONTHECANOPYOFTHESUPPORTISSETTIGHTLYAGAINSTTHEROOFSTRATA,BYTHESUPPORTINGRESISTANCESOFTHEHYDRAULICLEGSWHENTHECUTTINGMACHINECUTSANDPASSESSEVERALSUPPORTUNITSBEYONDTHESUPPORTINQUESTION,THESUPPORTLEGSARELOWEREDANDPULLEDFORWARDFORADISTANCEEQUALTOTHEWIDTHOFCUTWEBBYRETRACTINGTHEHYDRAULICADVANCINGRAMTHEADVANCINGRAMACTSAGAINSTTHEFACECONVEYORPANLINE,WHOSEPOSITIONISHELDUNCHANGEDBYTHEADVANCINGRAMS,FORCESOFTHESUPPORTSTHATARESETONBOTHSIDESOFTHESUPPORTTOBEADVANCEDASSOONASTHESUPPORTHASBEENADVANCEDTOTHEDESIGNEDPOSITION,THESUPPORTISIMMEDIATELYRESETAGAINSTTHEROOFFINALLY,THEADVANCINGRAMOFTHESUPPORTINQUESTIONISEXTENDEDTOPUSHTHECONVEYORFORWARDANDBECOMESREADYFORTHENEXTCUTTHESEQUENTIALSTEPSDESCRIBEDAREFORTHEADVANCEOFANINDIVIDUALSUPPORTINTHEDIRECTIONPERPENDICULARTOTHEFACELINEBUTALONGTHEFACELINEDIRECTION,THE
个人主页