门座式起重机分单臂架和四连杆两种类型，起重机的起升、变幅、回转和行走四大机构均采用交流变频调速，整机采用PLC控制，使用性能优越。
Portal crane sub frame and four-link arm two types, from the crane hoisting, luffing, slewing and walking four agencies ac frequency control, the machine USES PLC control, superior performance.
砖烟囱属高耸构筑物，本例应用木结构内脚手架形成作业面，采用附着自升式独臂拔杆作为垂直运输工具。
Brick chimney is a kind of high-rise structures. In this essay, we use the inside-timber-scaffold system as operation area and, the mast crane as means for up-and-down transport.
砖烟囱属高耸构筑物，本例应用木结构内脚手架形成作业面，采用附着自升式独臂拔杆作为垂直运输工具。
Brick chimney is a kind of high-rise structures. In this essay, we use the inside-timber-scaffold system as operation area and, the mast crane as means for up-and-down transport.
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