The Automatic Safe Load Indicator (SLI) for Tower Cranes is a comprehensive lifting safety and monitoring system designed for construction and high-rise projects. The system continuously calculates the safe working load based on load weight, jib length, wind speed, and crane configuration to prevent overload and unsafe lifting.

This intelligent solution enhances crane safety, improves operator awareness, and ensures compliance with international lifting safety standards.

Key System Components

1. Tensiometer (Load Sensor)
The tensiometer measures the actual lifting load from the hoist rope in real time.

Functions:
• Continuous load monitoring
• Overload detection and warning
• Accurate load data for safe load calculation

2. Jib Length Box
The Jib Length Box detects and monitors the effective jib length and trolley position.

Functions:
• Calculates working radius based on trolley movement
• Ensures precise load chart calculation
• Essential for tower crane safe load computation

3. Anemometer (Wind Speed Sensor)
The anemometer monitors wind speed at crane height.

Functions:
• Real-time wind speed monitoring
• High wind alarm and warnings
• Prevents lifting during unsafe weather conditions

4. Monitoring Display Unit
Installed in the operator cabin, the monitoring display shows real-time lifting data and safety alerts.

Displays:
• Actual load
• Safe Working Load (SWL)
• Jib length / working radius
• Wind speed
• Alarm and warning messages

How the System Works

The SLI system gathers data from the load sensor, jib length box, and anemometer, then processes the information using built-in crane load charts. The system continuously calculates the safe lifting capacity and provides real-time feedback to the operator.

When unsafe conditions occur, the system provides:
• Visual alerts
• Audible alarms
• Overload warnings

Key Features

• Real-time load monitoring and overload protection
• Accurate jib length and working radius calculation
• Wind speed monitoring for high-rise safety
• User-friendly monitoring display
• Designed for construction and tower crane applications
• Durable and reliable for harsh site conditions
• Supports compliance with lifting safety standards

Benefits

• Prevents crane overloading and structural damage
• Improves lifting safety in high-rise construction
• Enhances operator decision-making
• Reduces downtime and accidents
• Promotes a strong safety culture on construction sites