Classification of crane work and its significance

[Alec]

First, the classification method of crane work grade

The classification of crane work grade mainly includes three aspects, such as work system, work intensity and work frequency. The specific division is as follows:

1. Working system: divided into A, B, C, D, E five kinds.

Class A: The continuous operation time is less than or equal to 25%, that is, the operation time is less than or equal to 15 minutes per hour;

Level B: The continuous operation time is less than or equal to 50%, that is, the operation time is less than or equal to 30 minutes per hour;

Class C: Continuous operation time is less than or equal to 65%, that is, the operation time per hour is less than or equal to 39 minutes;

Level D: The continuous operation time is less than or equal to 85%, that is, the operation time is less than or equal to 51 minutes per hour;

Class E: The continuous operation time is greater than 85%, that is, the operation time per hour is greater than 51 minutes.

2. Working intensity: divided into M3, M5, M6, M7, M8, M9, M10 seven.

M3 class: lifting weight less than or equal to 0.25t;

M5 class: lifting weight less than or equal to 0.5t;

M6 class: lifting weight less than or equal to 1t;

M7 class: lifting weight less than or equal to 2t;

Class M8: lifting weight less than or equal to 3.2t;

M9 class: lifting weight less than or equal to 5t;

M10 class: The lifting weight is less than or equal to 10t.

3. Working frequency: It is divided into FEM 1.BM, 2M, 3M and 4M.

FEM 1.BM: lightweight, operating time less than or equal to 100 times per hour;

FEM 2M: medium, less than or equal to 200 times per hour;

FEM 3M: Heavy duty, operating time is less than or equal to 300 times per hour;

FEM 4M: Extra heavy duty, more than 300 times per hour.

Second, the significance of crane work grade

For the safe operation of the crane, the division of the work grade has a very important significance. According to different work levels, determine the scope of use and carrying capacity of the crane, so as to ensure the safety of the crane operation.

For example, in small factories, the work intensity of the crane can be lower than the requirements in large factories, because the work intensity is based on the weight of the lifting, and the lifting weight in small factories is generally less than the lifting weight in large factories; For example, in continuous lifting operations, the working level of the crane is generally higher than the requirements of non-continuous lifting operations.

Therefore, the correct division of the work grade of the crane can improve the efficiency of the crane, reduce the possibility of accidents, and ensure the safety of enterprise employees and the normal progress of production.

【 Conclusion 】

The classification of crane work grade is composed of three aspects: work system, work intensity and work frequency. The correct classification of work grades can ensure the safe operation of the crane, improve the efficiency of use, avoid accidents, and ensure the safety of employees and the normal progress of enterprise production.