Belt scales are ingenious devices that continuously measure the weight of material flowing on a conveyor belt. Here's a detailed breakdown of how they work:

The Working Process

l Material Flow: As material moves along the conveyor belt, it passes over the weighbridge section supported by load cells.

l Weight Detection: The weight of the material on the weighbridge applies pressure to the load cells.

l Signal Conversion: This pressure causes the load cells to compress slightly, generating a corresponding electrical signal proportional to the weight.

l Speed Measurement: The speed sensor measures the speed of the conveyor belt.

l Data Processing: The integrator receives the signal from the load cells and the speed data. It uses a mathematical formula (often integration calculus) to calculate the mass flow rate of the material. This essentially multiplies the weight per unit length of the belt (determined by the load cells) by the speed of the belt to get the total weight of material passing over the belt per unit of time (e.g., tons per hour).

l Weight Display and Recording: The calculated weight data is displayed on the control unit for the operator to see. It can also be electronically recorded for data analysis, reporting, or integration with control systems.

Additional Considerations

l Calibration: Regular calibration with certified weights is essential to ensure the accuracy of the weight measurements.

l Material Characteristics: The properties of the material being conveyed, such as moisture content or particle size, can affect weight distribution and may require specific calibration procedures.

l Belt Tension and Alignment: Uneven belt tension or misalignment can lead to inaccurate readings. Proper belt maintenance is crucial for optimal performance.