Double-girder cranes are used in workshop premises of enterprises, at open storage facilities, in river and sea ports.
Based on the type of process in which the cranes are used, the main functional groups were formed.
2. Group of cranes of special purpose
is used to provide lifting and transport operations of
certain types. Cranes of this group are designed for a certain process. Typically, such cranes are
equipped with additional mechanisms (rotation of the load trolley, extension and rotation of the
auxiliary boom), can not always replace the usual hook crane (in connection with the design
features) and are equipped with individual hoisting devices.
Characteristics of cranes of special purpose are usually selected individually.
3. Group of metallurgical cranes.
The applicability of cranes of this group can be determined on the basis of names (magnetic, grab, turnaround charging, casting, pit, stud pulling, ingot-stripping cranes, cranes with rigid suspension of hoisting devices).
Cranes of this group are “heavy” cranes designed and constructed with high strength and
overload safety factors, because:
they have high indicators of reliability (as a rule, they do not have duplicate analogues in
they operate at high speeds (in conjunction with mounting speeds);
they bear a large number of alternating loads, close to the maximum permissible loads;
they operate in the heaviest loading modes A8 (100% duty factor);
they require highly skilled machinists, because in most cases it is not allowed to attract slingers.