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.

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。

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The current widespread use of self climbing tower crane has three basic ways of installation: concrete block installation fixed foot, large chassis heavy pressure and mounting is walking.

目前普遍使用的自升式塔机有三种基本安装方式：即大混凝土块内安装固定脚，大底盘加压重和行走式的安装方式。

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Mr Wood, 39, from Sutton, was walking to work when the helicopter crashed into a crane in Vauxhall on Wednesday.

BBC: Matthew Wood

Walking along Fifth Avenue today (Friday), New Yorkers gawped at the buckled crane on 57th Street still hanging over our heads.

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