What does the working grade A1A8 mean
Load condition of crane The load state of the crane is related to two factors, one is the actual lifting load and the maximum payload ratio (Pi/Pmax) The other one is the number of lifting loads associated with the total work cycle ratio (ni/N). The value of Pi/Pmax and ni/N is called Kp, and the expression is: KP = Pi - I = 1 lift load, I = 1, 2, 3... N; Ni -- the number of effects of load Pi; N -- the total number of work cycles. Pmax - rated weight; M -- exponential; Table 3 is the load state of the crane and its nominal load genealogy table. Table 3 crane load condition and nominal load spectral coefficient Kp The nominal load factor, KP says Q1 - light In Q2 - Q3 - heavy Q4 - heavy 0.125 0.25 0.5 1.1.0 is seldom raised with a nominal load Sometimes the load is rated, and the average lift is moderate The load is usually raised, usually lifting heavy loads The load is rated frequently Crane working grade The crane is divided into eight working levels according to the crane utilization level (table 2) and load condition (table 3) A1 ~ A8. Table 4 is a breakdown table of the working level of the crane.
In order to be safe, crane is used for crane operation. Crane working grade Crane work level (gb3811-83) is classified according to crane utilization rating and load condition. Crane use grade The use level is the frequency of the use of the crane in its effective life, and the total number of work cycles is N According to the total number of cycles, the crane is divided into U0 ~ U910. Table 2 is the crane utilization scale. Table 2 crane utilization level Use the rank total work cycle N notes
The type of crane work The type of crane is the parameter that indicates the degree of idleness of the crane and the degree of load variation. The degree of leisure of work includes the number of hours worked by crane and the load duration of crane. The degree of load variation, the ratio of the average of the actual weight of the crane to the weight of the crane during the full year, and the number of working cycles per hour. The crane is divided into light, medium, heavy and special class according to the extent of the crane's work and the degree of load change. Table 1 is the crane work type list. Table 1 crane work type list The extent of the load variation in the work type The operating time ratio (JC %) of the operating time rate of crane years is the number of cycles per hour The light level 1000 15 often lifts a 1/3 rated load 5 Intermediate 2000 25 is frequently hoisted (1/3 ~ 1/2) rated load 10 The weight class 4000 40 often lift rated load 20 The special class 7000 60 lifting load opportunity is more than 40
The working level of the crane is divided crane Crane is divided into light, medium, heavy and special class by using the degree of busy and varying load How to choose the working level of crane? Here we introduce the work type and grade of the crane, which can be used as a reference for selecting type The type of crane and the level of work
