1. First distinguish between sling and rigging from the definition.
Spreader refers to a rigid fetching device for hoisting operations.
Rigging refers to the combination of rigging devices that are nuisance when the objects are tied and hooked.
2. Distinguish from the structural composition
The spreader can directly lift objects, mainly including: hook, grab, metallurgical fixture, permanent magnet chuck and special spreader.
Rigging is generally composed of interference (wire rope, lifting chain, lifting belt, lifting rope, etc.) with end rings, hooks, shackles, butterfly buckles, etc.
3. Finally distinguish from the workload
The ultimate working load of the rigging refers to the maximum weight that a single-limb rigging is allowed to bear when it is suspended vertically under normal conditions of use.
The maximum safe working load of the rigging: Except for vertical suspension use, there is an angle between the rigging point and the article, which makes the rigging force change and the maximum mass that is allowed to bear under a specific suspending method. It is called the maximum safe working load of the rigging.
The rated lifting capacity of the spreader refers to the maximum weight allowed to bear the article when it is hung vertically under general conditions of use.