1·The machine can operate separately or cooperate with portal crane to hoist dirt.
该机可单独运行，并可配合门机吊起工作。
2·The portal crane is the main hoisting equipment for loading and unloading in the port.
港口门座起重机是港口装卸作业的主要起重设备。
3·The vibration course of the working mechanism of the portal crane has its particularity.
门座式起重机的工作机构振动历程有特殊性。
4·No. 4 semi-portal crane has been used in Qingtongxia Hydropower Station for more than 30 years.
青铜峡水电厂4号半门式起重机投入运行已30余年。
5·Semi-portal crane No. 4 has been put into operation for 30 years at Qingtong Gorge Hydropower Station.
青铜峡水电厂4 号半门式起重机投入运行已三十余年。
6·A new method of calculating the driving power of portal crane luffing mechanism is introduced in this paper.
本文介绍了一种计算门座起重机变幅机构驱动功率的新方法一瞬心回转功率法。
7·As an example, we build the model of the portal crane CAD system to verify the above techniques and criterions.
最后作为复杂机械产品的应用实例，建立了港口门座式起重机的CAD系统模型。
8·The dynamic optimization method of determining the counterweight and its center of portal crane is put forward.
提出了确定门机对重质量及其位置的动态优化法。
9·This paper also takes a deep research on the application of the vibration monitoring technique to the portal crane.
本文还对振动监测技术在门座起重机上的应用，进行了深入的研究。
10·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。