To a certain extent luffing crane, lifting the lifting only allowed, if overweight, attention has danger of tipping.
对于变幅起重机，一定的幅度只允许起吊一定的吊重，如果超重，起重视就有倾翻的危险。
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。
The double rocker mechanism (with back rocker driving) is used to luffing operation of floating crane. It has high productivity and transfer flexibility.
这种双摇杆变幅机构可用于浮式起重机的带载变幅作业，具有高的生产率和作业灵活性。
This is Electro-Hydraulic Heavy Duty type level luffing type deck crane.
辻产业的吊机是电动-液压驱动型水平变幅式重载型克令吊。
There are hoisting mechanism of crane, slewing mechanism, the luffing mechanism and metal structure selection in this article.
设计主要包括起重机的起升机构、回转机构，变幅机构及金属结构的选择。
Reaserch the relations between at luffing course of horizontal movement and jib system organization's static stressing, as well as to improve the analyses means of design software of these same crane.
探寻物品在变幅过程中水平移动与臂架系统结构静态受力之间的关系，研究臂架自重平衡系统的设计与臂架系统动力响应之间的关系以及对改善该类门机的设计软件的分析手段。
A new-type quayside container crane with jib-bridge luffing system as the main working part is brought out.
提出一种以臂桥架变幅系统为主要工作机构的岸边集装箱起重机。
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。
At present, the research of dynamic characteristics on luffing mechanism of crawler crane is relatively lacking at home and abroad, and is not enough overall.
目前国内外对于起重机变幅机构动态特性的研究比较少，而且研究不够全面。
At present, the research of dynamic characteristics on luffing mechanism of crawler crane is relatively lacking at home and abroad, and is not enough overall.
目前国内外对于起重机变幅机构动态特性的研究比较少，而且研究不够全面。
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