The tower crane is mainly composed of vertical tower, horizontal tower, tower tower and balance arm, as shown in Figure 3.67.

塔式起重机主要由竖直塔身、水平塔臂、塔顶和平衡臂等主要部件组成，如图3.67所示。

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The paper presents a designing method for the tail—end balance weight of the swing—arm of the "Crane" type portal cranes.

本文向读者推荐港口鹤式起莺机摇臂尾端平衡重设计方法。

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Balance weight block installation position is not accurate, will cause the boom and the balance arm balance torque deviation is too large, easily lead to instability of the tower crane.

平衡重块安装位置不准确，会造成起重臂与平衡臂平衡力矩偏差过大，轻易造成塔吊失稳。

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But eager to offer some balance with the goal of stimulating thought and conversation, they invited Ed Crane (full disclosure: I am professionally associated with the Cato Institute, though not in a policy capacity), co-founder of the libertarian Cato Institute, to speak.

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