門座式起重機水平變幅係統

門座起重機大多采用水平變幅係統。

①重zhong物wu和he臂bi架jia係xi統tong各ge自zi的de重zhong心xin在zai變bian幅fu過guo程cheng中zhong幾ji乎hu無wu垂chui直zhi位wei移yi。其qi方fang法fa之zhi一yi是shi靠kao增zeng設she活huo動dong平ping衡heng重zhong來lai平ping衡heng臂bi架jia係xi統tong俯fu仰yang時shi的de合he成cheng重zhong心xin的de升sheng降jiang變bian化hua這zhe種zhong方fang法fa布bu置zhi較jiao方fang便bian，工gong作zuo也ye較jiao可ke靠kao，應ying用yong廣guang泛fan。方fang法fa之zhi二er是shi靠kao臂bi架jia係xi統tong的de機ji構gou特te性xing來lai保bao證zheng變bian幅fu時shi合he成cheng重zhong心xin的de移yi動dong軌gui跡ji接jie近jin水shui平ping線xian，無wu活huo動dong平ping衡heng重zhong。

②所suo吊diao重zhong物wu在zai變bian幅fu過guo程cheng中zhong沿yan著zhe近jin於yu水shui平ping線xian的de軌gui跡ji移yi動dong
，可ke采cai用yong補bu償chang法fa和he組zu合he臂bi架jia法fa。補bu償chang法fa是shi通tong過guo特te種zhong儲chu繩sheng係xi統tong在zai變bian幅fu過guo程cheng中zhong自zi動dong收shou放fang相xiang應ying起qi升sheng繩sheng，以yi補bu償chang臂bi架jia升sheng降jiang造zao成cheng的de吊diao具ju垂chui直zhi位wei移yi。組zu合he臂bi架jia法fa是shi依yi靠kao組zu合he臂bi架jia的de機ji構gou特te性xing保bao證zheng臂bi端duan在zai變bian幅fu過guo程cheng中zhong接jie近jin水shui平ping移yi動dong。兩liang種zhong方fang法fa都dou得de到dao廣guang泛fan應ying用yong。