Contact

For product information and pricing, chat with sales agent

+86-373-5280888
+86-373-5290999
info@rubbercrane.com

2014-10-18 17:39:47Working Class Division

1、Service grade of crane(the using frequency )

Service grade mark Working cycle N (upper limit) Remarks Service grade mark Working cycle N (upper limit) Remarks
U0 1.6×104 Don't often use U5 5×105 Often interrupted using
U1 3.2×104 U6 1×106 Buy to use
U2 6.3×104 U7 2×106 Busier to use
U3 1.25×105 U8 4×106 Busiest to use
U4 2.5×105 Often use with light duty U9 >4×106 Busiest to use

One working cycle:Sling→lifting→traveling→down→unloading→Return to the original place with empty hook.

Calculating formula of total working cycles :N=3600YDH/tc

Y:Using age of crane(usually 20~30 years) D:Working days in one year(265 days)

H:Working hours in one day tc :One working cycle time(s),is related with working frequency.

2、Loading state grade of crane(The loading degree in lifting)

Loading state means the approached degree of usual lifting quality of crane to the rated lifting capacity

  • Pi: The i time lifting quality.
  • Pmax:Rated lifting capacity.
  • ni:loading Pi action times
  • N:Total working cycles
Loading state Load spectrum coefficient Kp Remarks
Q1---light 0.125 Hardly lifting rated load, usually lifting light load.
Q2—middle 0.25 Sometimes lifting rated load,usually lifting middle load.
Q3—heavy 0.5 Often lifting rated load,usually lifting heavy-duty load
Q4—heaviest 1.0 Frequently lifting rated load.

3、Working class of crane(GB、ISO) FEM standard:1Bm=A3 1Am=A4 2m=A5 3m=A6 4m=A7

Loading state Load spectrum coefficient Kp Working class
U0 U1 U2 U3 U4 U5 U6 U7 U8 U9
Q1—light 0.125 A1 A1 A1 A2 A3 A4 A5 A6 A7 A8
Q2—middle 0.25 A1 A1 A2 A3 A4 A5 A6 A7 A8 A8
Q3—heavy 0.5 A1 A2 A3 A4 A5 A6 A7 A8 A8 A8
Q4—heaviest 1.0 A2 A3 A4 A5 A6 A7 A8 A8 A8 A8
 

!!!Note: should make clear the followings, rated lifting capacity, how many days will it work in one week, how many hours will it work in one day, how much weight it will lifting usually, how many will it last of one working cycle, interval of continuous operation or two working cycles. 

Technical Support: Handing China 2014-2015 ©Copyright Henan Modern Crane CO., LTD