Relationship between lifting capacity and working

The relationship between crane load state, lifting capacity and working level

enterprises for many years have taken the selection of hard dashboard as an example. Safety management work has found that it is one thing for some safety technicians to confuse the crane load state, lifting capacity and working level when reviewing the "three Simultaneities" of lifting equipment, that is, the higher the working level, the higher the load state; The lower the working level, the lower the load state; Or the higher the rated load of the crane, the higher the working level; The smaller the rated load of the crane, the lower the working level. The main reason for this error is the unclear concept of the working level, load state and load capacity of the crane. Mistakes are often made in the examination and approval of "three Simultaneities". First, the "big with small" wastes the amount of money for measuring the force of a series of dynamometers with fixtures. Second, the "small with large" buries the hidden danger of accidents. In order to attract the attention of safety technicians, master the relationship between them, and facilitate our application in production practice, this paper is divided into the following three parts:

first, explain the relevant concepts

1. Rated load G: the clamping force of this Engel v-duo 3600 machine is 3600 tons, which refers to the maximum allowable lifting weight (including the weight of separable slings) when the crane is in normal operation, and the unit is expressed in tons (T)

2. Load state Q: it is a parameter that reflects the program of crane load change and load action times change. It is usually expressed by the nominal load spectrum coefficient Kp. KP is expressed by the ratio of the actual lifting load PI and the maximum lifting load Pmax to help provide necessary oxygen, nutrition, fluid and drugs, and the number of lifting load actions Ni to the total number of working cycles n. The formula is:

according to the nominal load spectrum coefficient KP, it is divided into Q1 light - Q4 heavy (see the following table)