The crane working level is different from the working level of the crane metal structure. For the same crane, due to the inconsistent load and the unequal work performance of each working mechanism, even if the same crane, the working level of different agencies and the crane's working level is often inconsistent, which is in different parts of the crane.
In addition, it must be pointed out that the crane working level and crane lifting weight are two different concepts. The lifting weight refers to the quality of the hoisted material at a time, and the working level is the comprehensive operating characteristic parameter of the crane.
The lifting weight is large, the working level is not necessarily high; the lifting weight is small, and the working level may not be low. Even if the cranes of the same type are of the same weight, the safety factor of the parts will not be the same as long as the work level is different. If you only look at heavy tonnages and ignore the work level, and the cranes with low working levels are used frequently and at full capacity, you will expedite the use of fragile parts, cause frequent failures, and even cause accidents.
The utilization of the level, that is, the busyness of the work of the organization, is divided into 10 levels of T0 to T9 according to the total number of operating hours of the total design life of each institution. The load status indicates that the degree of loading of the mechanism is divided into four levels of light, medium, heavy and special weight. The working level is divided into eight levels of M1 to M8 according to the use level and load status and according to the diagonal principle.
The working level of the crane is a parameter indicating the degree of heavy work of the crane, that is, the parameter indicating the heavy in terms of time and full load of the crane. The hook type crane is divided into: A1-A3 (light level); A4-A5 (intermediate level); A6-A7 (heavy) seven levels of three levels.