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The Work Duty Classification of the Overhead Cranes between European Standard FEM 、International Standard ISO and China National Standard GB.

Views:269     Author:Site Editor     Publish Time: 2019-07-12      Origin:Site

1. Cranes Work duty Classification

Work Duty

Intermittent Service

State of loading FEM ISO GB Cycles/H Start/H Ed in %
Light 1DM M1 A1 15 90 15
1CM M2 A2 20 120 20
Moderate 1BM M3 A3 25 150 25
1AM M4 A4 30 180 30
Heavy 2M M5 A5 40 240 40
3M M6 A6 50 300 50
Super Heavy 4M M7 A7 60 360 60
5M M8 A8 60 360 60

European stanrdard bridge crane_2  LH overhead crane

2. Determining the Operating Group of the Hoist


According to the Average daily operating time to separate the lifting mechanism work duty:

Work Duty

Average daily operating time (hours per day)

0.5

 1

 2

 4

 8

 16

Light duty



M3 M4 M5 M6
Moderate
M3 M4 M4 M6 M7

Heavy

M3 M4 M5 M6 M7

Super heavy

M4

M5

M6

M7




QD  QDY

How to calculate the Average daily operating time ?


The average daily operating time of the hoist can be calculated from the running time of the hoisting machinery (hours per day):

t =  (2 × H ×N × T) ÷ (V × 60)


T:Average Daily Operating time.

H:Average lifting height (meter)

N:Number of Work Cycles Per Hour (cycles/h)

T:Daily working time (h)

V:Lifting Speed (m/min)

3. Work duty Classification

Light Duty:  Mechanism subjected very rarely to the maximum load and normally, to light loads.

Widely used in the power plant and areas where mainly use to installation and maintenance the machines, or the not busy workshop.

Moderate Duty: Mechanism subjected fairly frequently to the maximum load but, normally, to rather moderate loads.

Widely used in the busy work shop, like the normal machinery processing and assembly line etc.

Heavy Duty:  Mechanisms subjected frequently to the maximum load and, normally, to loads of heavy magnitude, Widely used in the busy workshop, long times and frequently loading the heavy duty materials, steel plant etc.

Super Heavy Duty: Mechanisms subjected regularly to the maximum load, mainly used in the steel plant, casting plant etc.

 






 


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