balance-type beam pumping unit 天平式游梁抽油机
By the terms of the calculated result we found a rule that all this type tower crane don't need to estimate the fatigue life of balance beam.
根据疲劳寿命结果得出该类型式起重机起重臂的设计不用考虑疲劳问题。
This type of equal arm balance with double beam and pan adopts flexible steel band as support without abrasion to the edges of the knife.
复梁式双盘等臂天平，采用钢带弹性作支撑，无刀口磨损现象发生。
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