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2025

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03

What is the working principle of a counting scale?

A loss-in-weight feeder, also known as a loss-in-weight scale, is a weighing device that controls material discharge by monitoring the rate of weight reduction. The following is a detailed explanation of its working principle:

Basic Working Principle

Weight Monitoring：The scale body of a loss-in-weight feeder typically includes a weighing hopper and a feeding mechanism. The weighing hopper is filled with material, and its weight is monitored in real-time by a high-precision weighing sensor.
Weight Reduction Rate Calculation：During production, material is discharged from the weighing hopper, and the weighing sensor detects the weight reduction. The control system calculates the instantaneous flow rate of the material based on the rate of weight change per unit of time.
Discharge Control：The control system compares the calculated instantaneous flow rate with the preset flow rate setpoint. If there is a deviation between the actual flow rate and the setpoint, the system sends a control signal to adjust the speed of the discharge device (such as a discharge screw or impeller) to adjust the discharge amount of the material, so that the flow rate returns to the setpoint.
Feeding Control：When the weight of the material in the weighing hopper decreases to the set lower limit, the control system starts the fast feeding device to replenish the material from the hopper to the weighing hopper until the material weight reaches the set upper limit, and the feeding stops.

Applications

Loss-in-weight feeders are widely used in industries requiring precise control of material flow, such as chemical, metallurgical, pharmaceutical, cement, and food industries. It can be used for batching and controlling various types of materials, such as powders, granules, and liquids.
Through real-time monitoring and automatic control, loss-in-weight feeders achieve precise regulation of material flow, improving the automation and precision of the production process.
 

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What is the working principle of a counting scale?

2025-03-26

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