The Automatic Safe Load Indicator (SLI) for crawler cranes is an advanced lifting safety system designed to monitor real-time operating parameters and prevent crane overloading. The system continuously calculates the safe working load based on boom angle, load, wind speed, and crane configuration, ensuring safe and compliant lifting operations.

This intelligent system enhances operator awareness, reduces accident risks, and helps organizations comply with international safety standards and best practices.

Key System Components

1. Tensiometer (Load Sensor)
The tensiometeris installed on the hoist rope or boom suspension line to measure the actual lifting load in real time.

Functions:
• Measures load tension continuously
• Sends real-time load data to the monitoring display
• Enables overload detection and warnings

2. Angle Sensor
The angle sensor is mounted on the crane boom to measure the boom angle during operation.

Functions:
• Calculates working radius
• Supports load chart calculations
• Ensures accurate safe load computation

3. Anemometer (Wind Speed Sensor)
The anemometer measures wind speed affecting crane stability.

Functions:
• Monitors environmental wind conditions
• Provides high-wind alarms
• Prevents unsafe lifting during strong winds

4. Limit Switch
The limit switch is installed on the hoist system to prevent over-hoisting or over-lowering.

Functions:
• Prevents hook block collision with boom tip
• Protects crane structure and lifting components
• Enhances operational safety

5. Monitoring Display Unit
The in-cab monitoring displayprovides the crane operator with real-time information and alerts.

Displays:
• Actual load
• Safe Working Load (SWL)
• Boom angle & working radius
• Wind speed
• Alarm & warning messages

How the System Works
The SLI system integrates data from multiple sensors installed on the crane. Using built-in crane load charts and intelligent algorithms, the system calculates the safe lifting capacity continuously and alerts the operator when the crane approaches unsafe conditions.

If the load exceeds safe limits, the system provides:
• Visual warnings
• Audible alarms
• Overload protection alerts

Key Features
• Real-time load monitoring and overload warning
• Accurate working radius and boom angle calculation
• Wind speed monitoring for safe operation
• Operator-friendly display interface
• Robust design suitable for harsh environments
• Enhances safety and reduces accident risks
• Supports regulatory compliance and safe lifting practices

Benefits
• Prevents crane overloading and structural damage
• Improves operator decision-making
• Reduces downtime and accidents
• Enhances lifting efficiency and productivity
• Promotes a strong safety culture on site