Crane Overload Limit

Crane overload limit is a key link to ensure the safe operation of the crane. It uses technical means to prevent the crane from lifting objects that exceed the rated load, avoiding equipment damage, overturning and safety accidents.

 Application Scenarios Crane overload limiters are widely used in various scenarios that require lifting operations, and are divided into the following by industry:

1. Industrial Manufacturing • Scenario: Bridge cranes and gantry cranes in workshops are used to lift heavy equipment or workpieces.

• Case: In automobile manufacturing workshops, when cranes lift engine cylinders, overload limiters can prevent the boom from deforming or the wire rope from breaking due to excessive loads. 2. Construction • Scenario: Tower cranes (tower cranes) lift materials such as steel bars and concrete formwork in high-rise building construction.

• Key role: Avoid overturning of tower cranes due to overload (such as the collapse of a tower crane at a construction site in 2023 due to overload. Such accidents are mostly caused by the failure to install or misuse of overload limiters).

3. Ports and Logistics • Scenario: Container quay cranes and rubber-tyred gantry cranes (RTGs) load and unload containers.

• Technical requirements: The weight of the container (including cargo) needs to be monitored in real time, and the positioning system needs to be combined to prevent eccentric loading. Some equipment needs to meet the data docking requirements of the port automation dispatching system (ECS).

4. Energy and Heavy Industry • Scenario: Wind power installation cranes hoist wind turbine blades, nuclear power cranes carry nuclear island components. • Special features: The load weight is large (such as wind turbine blades weighing more than 80 tons), and the overload limiter needs to pass third-party safety certification (such as EU CE certification, China special equipment type test).

5. Shipbuilding and offshore engineering • Scenario: Ship cranes (cranes) load and unload cargo or repair equipment at sea. • Challenges and responses: Affected by the shaking of the ship, the overload limiter needs to have a dynamic load compensation algorithm to avoid false alarms or missed alarms.

Summary:  Crane overload limit is the "lifeline" of safe production. Its technology has developed from mechanical limit to intelligent monitoring, which not only improves the safety of equipment, but also provides data support for digital operation and maintenance. In actual application, it is necessary to select appropriate overload limit devices according to crane type, load characteristics and industry standards, and strictly implement maintenance to maximize its protective effect.