电架空旅行起重机
D.uring our discussion in E.O.T crane: Part 1, we have discussed the fundamentals of EOT crane which could be seen in my previous post.
在理解此博客后，我们将详细了解有关电动开销起重机的各个方面的详细信息，
So, let us start without wasting time ...
B.asic component of E.O.T crane
在进行深度讨论之前，首先我们必须了解电动架空行驶起重机的各种组件。
E.。O.T crane: components
Let us understand about the various terms that we must have to mention for specifying an electric overhead travelling crane.
Let us consider each term that we used to use for specifying our requirements during selecting an ideal E.O.T crane for meeting our need.
Capacity of Crane
Capacity of crane is normally mentioned, by the manufacturer, over the name plate of crane. It indicates the safe working load for which crane or its hoisting mechanism is designed. Let us think if safe working load 25 ton is mentioned over the name plate of a electric overhead travelling crane , its mean we must lift the load 25 Ton or lower than 25 ton but we must not go beyond safe working load.
李ft height
起重机提升高度指示the distance between lower and upper level of snatch block or we may say that by how much height a crane can lift the load.
李ft height = Distance between beam and floor – height of crane hoist.
Runway height
It is basically the distance between top of rail and grade rail.
Clearance
It is basically vertical distance between crane girder bottom of rail and grade rail
。
Crane Span
Crane span is basically the distance which is measured horizontally between the runways rails over which crane will travel.
Runway length
It is basically the longitudinal length of runway which is measured parallel to the building length.
电气要求
一种ccording to US requirement for E.O.T Crane, we have noted the desired power supply which is given via conductor bar and power supply will be 480 volt, 60 Hertz and 3-phase.
When we select one E.O.T crane, in that condition apart from above need, we also mention some specific need based on the application of E.O.T crane. We have mentioned some examples below based on the professional working and maintenance experience of E.O.T crane.
1。Requirement of second hoisting mechanism?
我已经观察过E.O.T的起重机用于钢铁工业领域的各种活动，例如用于敲击或倾倒，此类起重机使用额外的吊装机制，并且这种额外的提升机构将被称为辅助升降机。
我们在一家钢铁工业中使用一个e.o.t起重机，用于在炉子或钢包中挖掘和浇注液体热金属。
我们指定如下所述的e.o.t起重机的容量
100/60/25 Ton
它表明，主要提升机构将具有100吨容量，并且有两个辅助吊装机制，其能力分别为60和25吨。
2。我们将使用此起重机的环境状况。
3.Use of anti collision device for avoiding the collision between two cranes if more than two or two cranes are traveling on same bay.
4。要求闪电，灯和任何其他重要的要求
5。Need of catwalk for maintenance access.
Question:什么是起重机的额定容量？
起重机的额定容量基本上是可以通过起重机提升机构轻松提升的负荷。
It is basically maximum working load which is suspended under snatch block.
抓握块的重量和钢丝绳的重量不会包含在起重机的额定负载中。
Question:What is test load of crane?
根据OSHA和ASME的说法，起重机负荷测试将以125％的起重机进行。
起重机责任组
B.y considering crane duty group we will come to know that the particular crane is designed for which type of duty such as for light duty, medium duty, high duty or very heavy duty.
It is very necessary to understand the crane duty group as we can't use a crane into continuous heavy duty work even crane is designed for light duty, hence for safety reason we must understand the crane duty group.
It is very necessary to understand the crane duty group as we can't use a crane into continuous heavy duty work even crane is designed for light duty, hence for safety reason we must understand the crane duty group.
有几个组织，我相信我们听到了ISO，HMI，FEM和CMAA等名称。这些组织有自己的标准和分类的起重机责任组，但这些组织使用类似的原则和事实来分类crane duty group.
让我们了解起重机职责组以及它用于的东西
CMAA Crane classification
一种ccording to the CMAA specification”70’’ for
crane classification, there will be six different classifications as we have mentioned below and these classifications are dependent on duty cycle.
CMAA Class |
D.escription |
细节 |
|
C
|
Moderate service
|
Crane under this classification will be operated approx 50 % of the rated capacity and with 8 to 10 lift per hour.
These types of cranes are used in machine shops
|
|
D.
|
Heavy service
|
Crane under this classification will be operated approx 50 % of the rated capacity but continuously throughout the working period and with 10 to 20 lift per hour.
These types of cranes are used in heavy machine shops, container yard , fabricating unit , foundries unit and
steel warehouses
|
|
E.
|
Severe service
|
Crane under this classification will be operated approx the rated capacity throughout the working period and with more than 20 lift per hour.
These types of cranes are used in container handling ,cement mills, scrap yard, fertilizer plant and lumber mills
|
|
F
|
Continuous Severe
Service |
在这种分类下的起重机将在整个起重机的寿命中运行额定容量，这种绞车将用于具有更高程度的可靠性的关键工作任务
|
起重机占空比分类的alise标准
We normally prefer the classifications given by
八乎Technical Report No. 6-Specifications for Electric Overhead Travelling Cranes for Steel Mill Service.
八乎alsoprovided standard for classifying the crane duty type and these classifications are as mentioned below.
Sr. No |
服务类 |
Cycles |
|
1
|
Class 1(N1)
|
不到100,000. |
|
2
|
Class 2(N2)
|
100,000 to 500,000 |
|
3.
|
第3级（N3）
|
500,000 to 2,000,000 |
|
4.
|
第4级（N4）
|
More than
2那000,000 |
进一步的七分之一提供了各种负载类
Sr. No |
加载类 |
Cycles |
|
1
|
L1
|
Cranes under this standard will lift the rated load rarely and normally lift very light loads |
|
2
|
L2
|
本标准下的起重机将很少提升额定负荷，通常升高额定容量的1/3 |
|
3.
|
L3
|
Cranes under this standard will lift the rated load frequently and normally lift 1/3 to 2/3 of the rated capacity |
|
4.
|
L4
|
本标准下的起重机将连续提升额定负载 |
因此，在负载周期和负载类的基础上，CMAA提供了一个图表，便于了解e.o.t起重机的类。
加载类 |
Load Cycles |
|||
|
N1 |
N2 |
N3 |
N4 |
|
|
L1
|
一种
|
B. |
C |
D.
|
|
L2
|
B.
|
C |
D. |
E.
|
|
L3
|
C
|
D.
|
E.
|
F
|
|
L4
|
D.
|
E. |
F |
F
|
平均日常工作时间
t = 2 * h * n * t /（v * 60）
在哪里，
H =平均提升高度(英尺或计)
n =工作周期数/小时数
T= Working time in one day (Hours)
v =吊装的速度（m / min）
继续阅读 .......
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