起重機吊臂變幅安全裝置

當dang不bu測ce事shi故gu發fa生sheng，吊diao臂bi變bian幅fu油you缸gang回hui路lu中zhong的de高gao壓ya軟ruan管guan或huo油you管guan爆bao裂lie或huo切qie斷duan時shi
，液ye壓ya回hui路lu中zhong的de平ping衡heng閥fa就jiu起qi作zuo用yong，鎖suo閉bi來lai自zi油you缸gang下xia腔qiang的de工gong作zuo油you

，使shi吊diao臂bi不bu致zhi下跌，從而確保作業的安全性。