Load condition indicates that the degree of the crane load, related to two factors, Namely the ratio of hoisting of the load and the rated load Pi/Pmax, and the ratio of the role of various hoisting load number and the general work cycles ni/N. Indicated the two relations of load spectrum factor and Kp calculated by type:
Trong công thức:
Kp—load spectrum factorand;
ni—the effect number of load Pi;
N—general work cycles, N= ;
Pi—the I hoisting load, i=1,2….n;
Pmax—max lifting load;
m—index, in here m=3.
Crane load condition according to nominal load spectrum coefficient is divided into four (see table 2)
Table 2:
Crane load condition | nominal load spectrum coefficient (Kp) | Explain |
Q1-light Q2-middle Q3-heavy Q4-extra heavy |
0.125 0.25 0.5 1.0 |
Rarely lifting load rating Sometimes lifting load rating Often lifting load rating frequently lifting load rating |
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