Crane Basic Concepts and Terms

1. Crane lifting capacity

Rated capacity of  overhead crane :The rated capacity of crane includes the weight of the cargoes and the weight of the lifting devices and load-handling devices like crane hooks, crane grab buckets, electric magnetics, and equalizing beams, and many others, etc.

Effective lifting capacity: The net maximum weight and capacity of the loads the overhead crane is required to lift.

2. Span of overhead crane

Span of overhead crane: The horizontal distance between the two rail centers /crane rails, on which  the main girders are supported and moves along ,is referred to as the cane  span of an overhead crane.

3. Lifting height of overhead crane

Lifting height or hook height: The vertical distance between the crane hook  and the floor. The crane hook height is determined by the crane runway  height which is subject to the clear inside height of the building or the available space of the workshop. .

4. Crane service duty

The crane services duty or working class of an overhead travelliing crane is an important consideration when selecting a overhead crane for your needs. The average load intensity and loading cycles are used to classify crane working classes. Due to differences in average load intensity and loading cycles, two travelling cranes with the same lifting capacity, span, and size may have distinct working classes in terms of working class and the crane components and parts may experience various short term and long term loading conditions.
Different crane service classes exist according to various criteria. The crane manufacturers Association of America (CMAA) divides overhead traveling cranes into six categories based on typical load intensities and cycle count. While the International Organization for Standardization (ISO), the European Federation Standard (FEM), and the Hoist Manufacturer Institute (HMI) classify all crane hoists based on higher requirements such as the number of starts and the maximum running time per hour.（More information please check the Crane Service Duty Tab or please feel free to contact us. ）

5. Speed of overhead crane

Lifting speed: In typical  crane operation, the velocity at which loads within the rated lifting      capacity travel vertically and steadily.

Crane speed：Crane  speed is the rate at which loads within a crane's rated lifting capacity      move horizontally or along a runway.

Trolley speed: In typical crane operation, the pace at which the trolley travels on the horizontal      tracks with loads within the rated lifting capacity.

Note: Whether a single speed, double speed, or frequency drive is required should be indicated.

6. Wheel pressure

The wheel pressure refers to  the pressure when the trolley moves to the limiting position on one side  with weights within the crane's rated lifting capacity on electric overhead cranes.

Note: Crane wheel pressure is proportional to the bearing capacity of the building's steel frame.

Main parts & components of overhead cranes

The lifting system, controlling system, crane frame, and among other things, are the primary spare parts of an overhead traveling crane. Parts and crane components for overhead traveling cranes include the main crane girder, end girder trucks or end carriages, electrical resistor, trolley, trolley frame, and hook blocking frame,etc.

For single girder overhead cranes, double girder overhead cranes, top running overhead cranes, underhung overhead cranes, and processed industrial cranes, various types of overhead crane parts and components are available. On the basis of your spare part drawing, we deliver tailored overhead cranes parts and processed overhead cranes components. For further information, please contact us.

Crane parts name: Main girder/ bridge crane

One of the most significant crane sections is the main overhead crane girder or overhead crane beam design, which supports the trolley or hoist. Crane main girders are categorised as truss girders, box girders, single girders, and double girders, and many other types of structures. Single girder, double girder, triple girder, box girder, truss grider, and other girder designs are available. Please do not hesitate to contact us if you require crane girder design.