The Life Protection Principle of The BOB-LIFT Crane Load Limiter

In 2019, a crane overturning accident at a certain port caused losses of over 20 million yuan. In 2022, a construction site suffered casualties due to the boom breaking caused by overloading... The common feature of these tragedies is overloading. The "nerve center" of modern BOB-LIFT cranes - the load limiter - is precisely the ultimate defense line to prevent such accidents.

Understand the load limiter

1.1 Definition

The Load Moment Indicator (LMI) is an intelligent safety system that monitors the working status of the crane in real time. It is like equipping the crane with "pain nerves". Through the sensor network, it constantly senses the lifting status to ensure that the operation is always within the safe range.

1.2 Core Functions

Real-time monitoring: The cab display screen visually shows the load status in red, yellow and green colors

Level 3 Defense (taking the BOB-LIFT 20T model as an example) :

When 90% of the rated load is reached, the cab will trigger a buzzer alarm

When reaching 100%, the dangerous action will be automatically locked (such as prohibiting further lifting).

When it exceeds 110%, immediately activate the emergency brake and generate a "black box" record

How does the system work?

2.1 Sensor Network

The entire system relies on the coordinated operation of four "sensory organs" :

Pressure sensor of the hydraulic oil circuit: Calculates the actual lifting weight through changes in oil pressure

Angle encoder of boom hinge point: Precisely measures the amplitude of operation

Strain gauges of key structures: Sense the stress changes of the metal frame

Chassis inclinometer: Monitors the horizontal status of the entire machine

2.2 Core Algorithm Unveiling

The system performs hundreds of torque calculations per second:

Actual torque = lifted weight × working range

For instance, when a 20-ton crane operates at a 30-meter span, even if it is only lifting 5 tons, the overturning moment generated is already equivalent to 85% of the safety limit. At this point, the system will issue an early warning, while traditional cranes may still be operating "blindly".

The technological innovation of BOB-LIFT

3.1 Dual-system fault-tolerant design

The main system is equipped with aerospace-grade sensors, while the backup system uses AI from the hook camera to identify the deformation of the steel cables. Even if the main system malfunctions, safety can still be guaranteed.

3.2 Intelligent Environmental Adaptation

Automatically lower the safety threshold when encountering sudden winds

When working on slopes, the optimal hoisting Angle is calculated through the pressure distribution of the outriggers

Automatically increase the alarm volume during night operations

Essential maintenance knowledge for users

Three daily checks

Cleanliness of the sensor probe

Alarm speaker status

Display screen self-check function

Monthly must-do:

Verify the accuracy with standard test weights

Check the anti-interference performance of the cable

Update the system security algorithm

Legal red line: China's "GB6067-2015" clearly stipulates that cranes over 1 ton must be equipped with an effective load limiting system.

The load limiter is not a cold electronic component, but a "life protection net" woven by countless engineers with their wisdom. The next time you see the percentage figures flashing in the crane cab, please remember: Each number that jumps is a solemn commitment to life.