An online belt scale, also known as a belt weigher or belt scale system, is a device that continuously measures the weight and speed of bulk material as it travels on a conveyor belt to determine the total quantity and flow rate. The system consists of a conveyor belt, a speed sensor, and an integrator (a control unit) that calculates the material's weight by using load cells under the conveyor's idlers. This technology allows for continuous, in-process weighing without interrupting the material's flow, which is crucial for monitoring production, managing inventory, and ensuring accurate batching in various industries like mining, logistics, and food production.  

How it Works

1. Weight Measurement: The belt scale uses precision load cells placed under a section of the conveyor belt's idlers (rollers). As material is loaded onto the belt, these load cells measure the resulting deflection and convert it into a weight reading. 
2. Speed Measurement: A speed sensor is used to measure the speed of the conveyor belt itself. 
3. Calculation: The integrator then combines the weight and speed data to continuously calculate the rate of material flow (e.g., tons per hour) and the total amount of material that has passed over the belt. 

Key Components

• Belt Scale: The mechanical part of the system, usually consisting of one or more idlers mounted on load cells that weigh a section of the loaded belt. 
• Speed Sensor: A device that measures the speed of the conveyor belt's rotation. 
• Integrator: An electronic control unit that receives data from the load cells and speed sensor, performs the calculations, and provides real-time readings and historical data. 

Applications

• Continuous Weighing: Measuring raw materials as they enter a process. 
• Batching: Controlling the accurate loading of materials into hoppers or other containers. 
• Production Monitoring: Calculating output and material consumption in production plants. 
• Logistics: Providing accurate weight data for inventory and shipping. 
• Quality Control: Ensuring product weight consistency in industries like food processing.