What is the working level of a crane?
Crane according to its using frequency, power cycle factors determine the level of work, work are divided into: A1 ~ A8, generally use conditions, A3, A4 can satisfy, metallurgy dedicated to at least level of A6.
Here, you need to point out that the crane's working level is a different concept than the lifting weight of a crane. The weight refers to the quality of the lifting material at a time, and the working level is the characteristic parameter of crane integrated work. If the weight is high, the level of work is not necessarily high; Small weight and not necessarily low level of work. Even if the weight of the same type of crane is identical, the safety factor of the parts is different if the working level is different. If only see lifting tonnage and ignores the work level, low level of the crane is frequent, full use of the work, then can accelerate the vulnerable parts scrap, make frequent failure, and even cause accidents. In addition, the working level of crane and metal structure is different from the level of organization. Work for the same crane, due to the various agencies at the inconsistencies and working range of load, even the same crane, different organizations working level and crane work level is often inconsistent, in the different institutions to be especially careful when scrap and update the parts.
Crane overall working level: Crane working level is that crane work heavy degree of parameters, namely that crane work heavy degree in time and full degree of parameters, hook type will be divided into: A1, A3 (light); A4 - A5 (intermediate); The A6 - A7 (heavy weight) three levels seven. Light level (A1-13) : few hoisting load rating, general lifting slightly load, used in power plant or other workplaces in installation and maintenance equipment, workshop and warehouse or work not commonly used. Intermediate (A4-15) : sometimes hoisting load rating, general lifting medium load, workshop and garage for heavy work, like general mechanical processing and assembly workshop. Heavy level (A6 - A7) : lifting load rating as usual, general hoisting heavy load, used to work hard work workshop and warehouse, such as long time frequently crane carrying heavy frontal heavy goods and using metallurgical plant.
Mainly consider the use frequency of crane, the general class work system is to show that when the workshop is working, the crane must be used frequently, and the fatigue test should be carried out. Light levels are rarely used, only for maintenance or occasional use. Intermediate is the boundary between the two. So in general, intermediate work is more. It depends on the process.
Working grade of crane and working class Cranes are classified according to their degree of hard work to, the national standard "crane design specification" (GB3811-83) is a reference to the international standard "crane equipment classification" (ISO4301-1980) the principle of division of crane working level. When considering crane heavy degree, distinguish the crane use frequency and load size two kinds of factors, according to the crane load reached its rating frequency of strong condition is divided into four load (light level, intermediate level, heavy, heavy), according to the requirements of the use of level and load condition, to determine the crane work level, is divided into eight level as the basis of crane design. When the crane is designed in the structure, it is proposed by the craft that the crane is at the working level, and the 10T ground is usually the intermediate or light level.
