A screw metering scale is an industrial device used for the continuous conveying and dynamic metering of powder and granular materials. By combining a conveyor with weighing sensors and a control system, it achieves precise material feeding and flow control, and is widely used in industries such as cement, chemical, food, and metallurgy. Its standards refer to internationally recognized dynamic metering specifications, and some high-end models follow strict load and calibration requirements for installation and maintenance.

Working Principle and Core Structure

A screw metering scale not a simple conveying device, but rather calculates flow rate by real-time monitoring of weight and speed. Its core lies in "dynamic weighing" and "closed-loop control". Acquisition and Calculation: The weighing sensor at the bottom of the device detects the weight of the material inside the screw tube in real-time, generating a voltage signal; the speed sensor at tail detects the rotation speed of the main shaft and outputs a pulse signal. The controller combines these two signals to automatically calculate the instantaneous flow rate and cumulative output.

Automatic Adjustment Mechanism The system compares the actual flow rate with the set value, outputs a signal to the variable frequency drive through PID regulation, and dynamically adjusts the rotation speed of the screw motor to ensure feeding amount remains stable within the preset range.

Key Component Composition:

Conveying Part: Includes the screw blades, cylinder body, and inlet/outlet ports. Some models a dual-screw structure (upper layer for stable flow, lower layer for metering) to reduce interference.

Weighing System: The core is a high-precision tension sensor Some patented designs use a single sensor placed at the golden force measurement point, combined with a spring leaf support structure to improve sensitivity.

Control System: Integrates a weighing controller and a screen, supports DCS or PLC communication, and features remote data transmission and anti-tamper functions.