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Working level of crane

The working level of crane

A crane is a machine that operates intermittently and has short and repetitive characteristics. At work, the crane when the body to open the stop, sometimes forward, sometimes reverse. Some cranes work three shifts day and night, and some work only one class, and some even work only a few times a day. This work situation shows that the crane and its agencies work is different degrees of busy. At the same time, the load on the crane is also changing, and some cranes are often full load, and some often only light load, its load is very different. In addition, due to the speed of the different institutions, the role of dynamic impact load is also different. Crane of this work, in the design of crane parts, metal structures and determine the power of the crane must be taken into account. Today, one of the main technical parameters of a crane is the working level of the crane, which replaces the unreasonable working system of the past.


Crane work level of the size is determined by the two ability, one is the use of crane frequency, known as the crane use level; the other is the ability crane bear the load size, known as the crane load state. The crane has a certain number of working cycles during its useful life. The working cycle of the crane operation is from the start to prepare the lifting of goods, to the next lifting of the goods until the entire operation process. The total number of working cycles represents the degree of crane utilization, which is one of the basic parameters of crane grading. The total number of working cycles is the sum of the total number of cycles of operation of the crane during its intended service life.

When determining the appropriate service life, consider economic, technical and environmental factors, as well as the impact of equipment aging. The following is the difference between the working area and the working level of  overhead crane:

                 Crane type (for example) Work level
overhead crane Hook type


Installation and maintenance for the power plant A1~A3
workshop and warehouse A3~A5
workshop and warehouse with heavy work A6、A7
Grab type intermittent loading A6
continuous handling A6~A8
Metallurgical special lifting of the material box A7~A8
feeding, A6
casting A6~A8
forging A7、A8
quenching A7、A8
clamp stripping A8
Cover A7、A8
cover with other customer requirements __


Crane working level:

The level of the use of institutions that the work of the busy, according to the total life of each agency in the design of the total number of hours of operation is divided into T0 ~ T9 a total of 10. Load status indicates that the load level of the mechanism is divided into four grades: light, medium, heavy and heavy. Working level according to the use of grade and load status, according to the diagonal principle, divided into M1 ~ M8 a total of eight.

Here, first of all need to point out that the crane operating level and crane weight is two different concepts. Lifting weight refers to the quality of the material being hoisted at one time, and the working level is the comprehensive operating characteristic parameter of the crane. From the weight, the work level may not be high; from a small weight, the work level may not be low. Even if the same weight from the same type of crane, as long as the work of different levels, the components of the safety factor is not the same. If you just look at tonnage and ignore the work level, the work of low-level cranes frequently, full load use, then it will accelerate the vulnerability of parts scrap, the failure frequency, or even cause accidents.

It should also be noted that the working level of the crane and the metal structure is different from the work level of the mechanism. For the same crane, because of the inconsistency and non-uniformity of each working mechanism, even the same crane, the working level of different agencies and cranes are often inconsistent, which in different parts of the body Pay special attention to scrapping and updating.

Crane overall working level:

The working level of the crane is a parameter indicating the heavy work degree of the crane, that is, the parameters indicating the heavy and heavy load of the crane in terms of time. The hook is divided into A1-A3 (light grade); A4-A5 (intermediate); A6-A7 (heavy) three levels of seven items. Light-duty (A1-13): very small lifting load, usually lifting light load, used for power stations or other workplace installation and maintenance equipment, or work is not commonly used in the workshop and warehouse.

Intermediate (A4-15): sometimes lifting the rated load, the general lifting of the medium load, heavy work for the workshop and garage, such as general machining and general assembly shop to use.

Heavy-duty (A6-A7): normal lifting load, generally lifting heavier loads, for heavy work shop and warehouse, such as long heavy lifting heavy load items and metallurgical workshop.

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