Unveiling The Principle of The Load Moment Limiter, The "Safety Brain" of Cranes

At the crane operation site, behind every precise lifting, there lies an invisible "safety guardian" - the Load Moment Limiter (LML for short). How exactly does this key system, known as the "safety brain" of cranes, work? Today, we will take the safety system of the BOB-LIFT crane as an example to unveil its mystery for you.

I. What is a load moment limiter?

The load moment limiter is an essential safety protection device for modern cranes. It automatically calculates and monitors the actual working moment of the crane by real-time monitoring key parameters such as the load weight, working amplitude, and boom Angle during lifting operations, ensuring that it always operates within a safe range.

Ii. Working Principle of BOB-LIFT Load Moment Limiter

The intelligent torque limiting system adopted by BOB-LIFT consists of three core components:

Sensing system

Weight sensor: Real-time monitoring of hook load

Angle sensor: Precisely measures the Angle of the boom

Length sensor: Detects the extended length of the boom

Computing unit

Real-time computing through a microprocessor:

Working moment = load weight × working amplitude

At the same time, safety factors such as the structural strength and stability of the boom should be taken into consideration

Protect the execution system

Warning prompt: An audible and visual alarm will be triggered when 90% of the rated load is reached

Limiting operation: Automatically restricts dangerous actions when the rated load is exceeded

Emergency protection: Stop operation immediately and lock the system in case of severe overload

Iii. Key Technical Features

The load moment limiter of BOB-LIFT has the following advanced features:

Multiple protections: Simultaneously monitor dangerous working conditions such as overloading, over-torque, and over-amplitude

Environmental compensation: Automatically correct the influence of environmental factors such as wind speed and slope

Data recording: Black box function, recording the data of the last 1,000 operations

Self-diagnostic function: Real-time monitoring of the system's own status to ensure reliability

Iv. Practical Application Value

In a container handling project at a certain port, the moment limiter of the BOB-LIFT crane played a key role in the following scenarios:

When sudden gusts of wind cause the load to swing, the system automatically calculates the wind load impact and adjusts the safety threshold

When the operator mistakenly attempts to overload the load for hoisting, the system immediately intervenes and stops the dangerous action

When visibility is low during night operations, provide continuous safety monitoring and guarantee

V. Key Points for Daily Maintenance

To ensure that the torque limiter always operates reliably, it is recommended

Conduct a functional test before each daily assignment

Calibrate the sensor accuracy regularly

Keep the sensor clean and intact

Update the system software version in a timely manner

This invisible "safety brain", through intelligent perception and precise calculation, constantly guards the safety of lifting operations. BOB-LIFT, with its advanced safety technology, ensures that every lift is more reassuring and reliable.