FEM/ISO
CLASSIFICATION
x
LIFTING DEVISE MECHANISM CLASSIFICATION
Light Lifting devices subjected exceptionally to the maximum load and normally to very light loads .
k ≤ 0.5
Medium Lifting devices subjected fairly often to the maximum load and normally to light loads .
0.5
< k ≤ 0.63
Heavy Lifting devices subjected frequently to the maximum load and normally to medium loads .
0.63
< k ≤ 0.8
Very heavy Lifting devices subjected regularly to loads close to the maximum load .
0.8
< k ≤ 1 x Maximum load to be lifted x Load condition x Operating class x Let us take an example of calculation to determine a mechanism group and the choice of the winch which matches : Including the weight of the cable and any lifting accessories (hook , etc.)
except where these are of a total weight of 5% or less of the load to be lifted .
where : β = effective or partial load nominal load γ = dead weight maximum load Thus a distinction is made between t = operating time with effective or partial load + dead weight total operating time t ∆ = operating time with dead weight only total operating time To determine the group for your lifting device , winch or block and tackle , three essential parameters are to be taken into account : These three parameters thus provide the means for classifying the devices into groups of mechanisms in accordance with this table you can use to determine the group for the lifting device you need : Details in what proportions the lifting device is used at maximum load or reduced load .
For an exact classification , it is preferably to calculate the average cubic value (k) using the formula below : This is the average operating time per day , on the basis of 250 working days a year .
The lifting device is considered to be in operation when it is moving ; conversely , it is not during stoppage times , between raising and lowering for example .
Duty factor
OPERATING CLASS
(or average daily operating time in hours , on the basis of 250 working days a year) Light 30 mn 1 h 2 h 4 h 8 h 16 h More than - Medium 15 mn 30 mn 1 h 2 h 4 h 8 h 16 h More than Heavy 7 mn 15 mn 30 mn 1 h 2 h 4 h 8 h 16 h Very heavy - 7 mn 15 mn 30 mn 1 h 2 h 4 h 8 h Solicitation
MECHANISM CLASSIFICATION
According to
FEM
rules 1Dm 1Cm 1Bm 1Am 2m 3m 4m 5m According to
ISO
standard M1 M2 M3 M4 M5 M6 M7 M8 Data : Maximum load to be lifted 5000 kg Load condition 50% of time at the nominal load (for the lifting device) 50% of time under no load Operating class 4 hours a day , 250 days a year .
In view of these elements : The characterised load condition (k) is thus : k = 0.79
=>« heavy » The mechanism group determined is : 3m (FEM) / M6 (ISO) The choice of winch in the
HUCHEZ
range will be :
INDUSTRIA
5 t (FEM/ISO 3m/M6) see page 46 7500TE see page 54 Our technical sales staff is at your disposal to help you determine the characterised load condition corresponding to your case .
four characterised load conditions : 102
GENERAL