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(3)动臂式变幅保持重物稳定移动的方法动臂式变幅即吊臂俯仰摆动式变幅。简单动臂式变幅是靠普通滑轮组或液压缸使吊臂俯仰的(见图11)。在变幅过程中,重物的重心位置会升降。当变幅幅度减小时,重心上升,
(3) Boom luffing method to maintain a stable movement of heavy boom-luffing or jib boom swing amplitude. Simple boom luffing is based on ordinary pulley block or hydraulic cylinder so that the boom pitch (see Figure 11). In the luffing process, the center of gravity of heavy objects will rise and fall. As amplitude decreases, the center of gravity rises,