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關於動臂變幅的起重機（如塔式起重機、活動式起重機等），除chu考kao慮lv載zai荷he的de巨ju細xi，還hai應ying考kao慮lv跟gen著zhe動dong臂bi變bian幅fu引yin起qi的de載zai荷he重zhong心xin至zhi起qi重zhong機ji的de間jian隔ge的de變bian化hua，即ji起qi重zhong力li矩ju問wen題ti。力li矩ju限xian製zhi器qi便bian是shi一yi種zhong歸gui納na起qi分fen量liang和he起qi重zhong機ji作zuo業ye起qi伏fu兩liang方fang麵mian要yao素su，以yi確que保bao起qi重zhong力li矩ju始shi終zhong在zai答da應ying規gui模mo內nei的de安an全quan設she備bei。可ke分fen為wei機ji械xie式shi和he電dian子zi式shi兩liang品pin種zhong型xing。
機(ji)械(xie)式(shi)力(li)矩(ju)限(xian)製(zhi)器(qi)有(you)杠(gang)杆(gan)式(shi)和(he)水(shui)平(ping)吊(diao)臂(bi)上(shang)運(yun)用(yong)的(de)兩(liang)種(zhong)限(xian)製(zhi)器(qi)。在(zai)起(qi)吊(diao)操(cao)作(zuo)中(zhong)，當(dang)起(qi)分(fen)量(liang)增(zeng)大(da)到(dao)限(xian)製(zhi)值(zhi)時(shi)，該(gai)限(xian)製(zhi)器(qi)能(neng)夠(gou)帶(dai)動(dong)控(kong)製(zhi)塊(kuai)以(yi)觸(chu)動(dong)控(kong)製(zhi)開(kai)關(guan)而(er)斷(duan)開(kai)電(dian)源(yuan)，中(zhong)止(zhi)作(zuo)業(ye)。
電dian子zi式shi力li矩ju限xian製zhi器qi在zai操cao作zuo過guo程cheng中zhong能neng夠gou經jing過guo儀yi表biao主zhu動dong將jiang實shi踐jian起qi重zhong力li矩ju與yu額e外wai起qi重zhong力li矩ju進jin行xing比bi較jiao，若ruo超chao載zai，繼ji電dian器qi就jiu會hui主zhu動dong堵du截jie作zuo業ye組zu織zhi電dian源yuan，確que保bao安an全quan。電dian子zi式shi力li矩ju限xian製zhi器qi克ke服fu了le機ji械xie式shi力li矩ju限xian製zhi器qi的de缺que點dian，廣guang泛fan應ying用yong於yu各ge種zhong起qi重zhong機ji上shang。
