inner balance arm 内平衡臂
outer balance arm 外平衡臂
cruciform balance arm 十字形天平臂
equal arm balance [仪] 等臂天平
equal-arm balance 一种简单天平 ; 等臂天平
Weight balance by swing arm 配重摆臂式缓冲杆
one-arm balance 单臂倒立
balance-weight arm 平衡重量支撑臂
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。
If the pumping unit is unbalanced, the counterweight and the crank balance arm can be adjusted according to the formulas presented in this article.
当抽油机不平衡时，可以按文中的公式调整平衡块和曲柄平衡半径。
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