Belt Weigher | Conveyor Belt Scale – Weighing Conveyor System

For weighing conveyor system material, belt weigher or conveyor belt scale are used. These scale determines the rate at which material travels on a conveyor belt over a specific period of time.

Conveyor Belt Scale or Belt Weigher Working Principle

A typical conveyor belt scale or belt weigher system has a weigh bridge structure supported on load cells, an electronic integrator, and a belt speed sensor.

The load cells measure the material weight on the belt, and send a signal to the integrator. The integrator also receives input in the form of electrical pulses from a belt speed sensor. Using these two sources of data, the integrator calculates the rate of material transferred along the belt using the equation:

weight x speed = rate.

Where Should You Install a Conveyor Belt Scale or Belt Weigher?

To attain accurate measurements and minimize any disruption in working processes, it is important to choose a suitable location for the installation of a conveyor belt scale. Below are a few points to help you select the best location for installing a conveyor belt scale:

Never install a belt scale near the materials loading point
Choose an area with constant belt tension
A steep incline is a poor location choice
Avoid locations where the conveyor forms a convex or concave curve
Consider vibration & weather

Preventive Maintenance of Conveyor Belt Scale or Belt Weigher

Work involved during preventive maintenance of belt scale or belt weigher:

Cleaning of integrator using a mild cleaner and soft rag.
The load cell assemblies, speed sensor, and angle are washed with low pressure water and mild soap.
Inspection of scale components for damages.
Cables inspection for pinches or breaks.
Load cells visually checking for material build -up.
Speed sensor wheel sound checking for wear.
Correction of identified problems.

Common Conveyor Belt Scale Problems and Solutions

A conveyor belt scale may show inaccurate readings due to belt movement, improper installation, material buildup, or faulty sensors. Regular troubleshooting helps maintain weighing accuracy and reliable material flow measurement.

Incorrect TPH readings: Check calibration, belt speed input, and load cell signals.
Fluctuating weight readings: Inspect belt tension, conveyor vibration, and load cell mounting.
Zero drift: Check for material buildup on the weighbridge and ensure the belt is empty during zero calibration.
Incorrect belt speed: Inspect the speed sensor, measuring wheel, and associated cables.
Difference between actual and indicated tonnage: Perform a calibration check and compare the scale readings with a reliable reference measurement.
Unstable readings at varying belt loads: Check material distribution across the belt and verify the scale installation location.

Regular zero calibration, periodic span calibration, inspection of load cells and speed sensors, and proper belt maintenance help improve the accuracy and reliability of a conveyor belt scale.