也称变幅限位或幅度指示器，一般的动臂起重机的起重臂上都挂有一个幅度指示器。
Also known as the amplitude limit or range indicator, jib cranes general boom are linked to a range of indicators.
当臂杆运行到上下两个极限位置时，分别压下限位开关，切断主控电路，变幅电机停车，达到限位的作用。
When the arm runs to the upper and lower two limit position, respectively press the lower limit switch, cut off the main control circuit, variable amplitude motor parking, to limit the role.
其设计的合理与否，对支臂的运动与受力、变幅动作的方便与灵活，都有很大的影响。
The design of these parameters has a great influence on the boom moving and stress and the swing action.
四连杆门座式起重机采用最佳优化的组合臂架系统，具有水平落差小、变幅平稳、功耗低的特点。
Four-link portal crane using the best combination of optimized boom system, with horizontal small gap, amplitude stable, low power consumption.
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.
汽车起重机是在通用或专用在载重汽车底盘上装上起重工作装置及设备的起重机，主要采用伸缩式臂架，油缸变幅。
Mobile crane is a general or special the heavy lifting the chassis on the work and equipment, cranes, retractable type mainly adopt the oil tank movement.
本文探讨伸缩臂装运机变幅机构的优化设计方法。
This paper studies the optimum design method of variable Angle mechanism of telescopic handler.
上层是个单独的白色立方体旋臂，左右跨幅大。
The upper level is a separate white cube, cantilevering over a big span.
四连杆组合臂架是门座起重机最常用的变幅机构形式之一。
The four-bar combination jib is one of the most commonly used forms of the derricking mechanism for portal cranes.
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。
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.
浮吊结构包括臂架、变幅钢丝绳、系固钢丝绳、桁框架、人字架、配重箱、回转底盘总成及回转支承等部件。
Floating crane structure mainly include boom, amplitude varying wire rope, tied back wire rope, truss frame, A-frame, counterweight box, rotating machinery base, and rotary bearing structure.
交流电桥的平衡不仅取决于桥臂参数的性质，还取决于调节参数的选择，要同时满足幅值和幅角的两个平衡条件，至少需要调节两个参数来实现。
To meet the needs of the two balance conditions of both argument and amplitude simultaneously, at least, two parameters should be adjusted.
所述拉紧装置能够顺利地实现臂架的变幅，并能够有效减轻臂架的挠度；
The tension device can smoothly realize amplitude of variation of the crane jib and effectively relieve the deflection of the crane jib.
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-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-type quayside container crane with jib-bridge luffing system as the main working part is brought out.
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