The four-bar combination jib is one of the most commonly used forms of the derricking mechanism for portal cranes.
四连杆组合臂架是门座起重机最常用的变幅机构形式之一。
The hoisting, derricking and slewing mechanism, the extension and contracting of booms, the setting down and back of outriggers, all are driven hydraulically.
该机的起升、变幅、回转、吊臂伸缩及支腿收放等机构，全部采用液压驱动。
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