Belt Weigher Scale

About Belt Weigher Scale

A Belt Weigheralso known as a belt scale, conveyor scale, or weigh belt systemis an inline weighing device used to measure the mass flow rate of bulk materials transported on a conveyor belt. It provides continuous, real-time weight data essential for process control, inventory management, and production monitoring.

1. Purpose & Function

A belt weigher is designed to:

• Measure the instantaneous flow rate (e.g., tons/hour)

• Record totalized material throughput (e.g., tons/day or tons/shift)

• Maintain accuracy during continuous operation

• Enable automated process control, such as feeding, batching, blending, and loadout operations

It achieves this by combining a load cell system with a speed sensor to calculate material mass per unit length and total flow.

2. Key Components

Load Cells

• Measure the weight of material on a section of the conveyor.

• High-precision, temperature-compensated sensors ensure accuracy.

Weigh Frame / Idler Assembly

• Specially designed idlers support the belt in a way that isolates and transfers material weight to the load cells.

Speed Sensor (Tachometer)

• Detects conveyor belt speed via rollers or a shaft encoder.

Integrating Controller / Weighing Indicator

• Calculates:

  • Mass flow rate (t/h)

  • Total material conveyed

  • Belt speed

• Provides local display and communication to PLC/SCADA systems.

Mounting Hardware & Calibration System

• Includes test weights or electronic calibration options for accuracy verification.

3. How It Works

1. Material passes over the weigh frame on the conveyor.

2. Load cells detect the weight of material per unit length of belt.

3. The speed sensor measures belt velocity.

4. The controller multiplies:

   $$\text{Load per meter}\text{Belt speed}=\text{Mass flow rate}$$

5. Total mass is integrated over time.

4. Typical Features

• High accuracy (0.25% to 1% depending on model)

• Rugged, industrial construction

• Compatible with multiple conveyor widths and speeds

• Real-time digital display

• Multiple communication protocols (Modbus, Profibus, Ethernet/IP)

• Automatic zero tracking and calibration functions

• Integrated diagnostics and alarms

5. Applications

Belt weighers are widely used in industries such as:

• Mining & Quarrying (coal, ores, aggregates)

• Cement & Building Materials

• Agriculture (grain, fertilizer)

• Power Generation (coal handling)

• Chemical & Petrochemical

• Food Processing (sugar, salt, grains)

• Recycling & Waste Management

6. Benefits

• Accurate production monitoring

• Reduced material losses

• Improved process control

• Automated inventory management

• Operational efficiency and cost savings

• Compliance with reporting and quality standards