The electronic screw scale mainly involves continuous dynamic measurement and control of the feeding, using a screw conveyor to transport powdery or granular materials to the metering cutter device. The Electronic scale installed on the metering cutter detects the weight of the material and generates a voltage signal proportional to the weighing load, and then sends this signal to the electronic scale. The electronic scale receives preset cutter speed data, usually when using dual-tube metering, the metering cutter maintains a constant speed, that is, the speed signal is the design value of the metering cutter. Through these data, the electronic scale can calculate the instantaneous flow rate and cumulative weight value. The control system compares the actual flow rate signal with the set flow rate signal, and through PID regulation, outputs control signals to the frequency converter, thereby dynamically adjusting the speed of the feeding screw cutter to achieve quantitative feeding. This process ensures that the material flow rate can be stable at the set flow rate. The electronic screw scale also adopts a feedforward regulation system, which continuously adjusts the speed of the powder balance lock device according to the set feeding amount to achieve accurate, stable and continuous feeding.

The electronic screw weighing device includes a base and a screw conveyor installed on the base. The screw conveyor includes a housing and a rotating shaft installed inside the housing. The shaft is provided with spiral blades, and one end of the shaft is power-connected to a drive motor with a frequency converter. The housing is provided with an inlet and an outlet, and the base is installed with a龙门支架， which installs a weighing module. The holding end of the weighing module is set at the outlet end of the screw conveyor housing. The drive motor is provided with a speed sensor. The weighing module and the speed sensor are electrically connected to the weighing instrument.

The electronic screw scale includes a metering cutter， a speed-adjusting rotary feeding valve， a weighing instrument， a frequency converter， a weighing module and a PLC control system. The PLC can achieve point-to-point communication between the central control and the local area， and the central control sends the target output to the weighing instrument， and the instrument outputs control signals to adjust the frequency converter output frequency， changing the speed of the speed-adjusting feeding screw cutter motor， the weighing module detects the weight of the material in the metering cutter， and transmits the signal to the weighing instrument. The instrument calculates the current instantaneous flow rate of the material based on the sensor signal and uploads it to the central control. The instrument performs PID calculation based on the target output， adjusts the control signal of the frequency converter， changes the motor speed， and makes the instantaneous flow rate reach the target output.

The screw load and speed signals are sent to the measurement， control and regulation system controlled by the microprocessor for processing. They are constantly compared with the set rate， thereby controlling the screw speed， keeping the feeding rate at a constant level. Usually， the instantaneous flow rate value and cumulative flow rate value can be calculated using the integral method or accumulation method. The instantaneous flow rate refers to the weight of the material flowing through the screw scale in a unit time (or at a certain moment)； the cumulative flow rate value refers to the total weight of all materials flowing through the screw scale within a certain period of time.

The electronic screw scale uses a screw to achieve the weighing function. The electronic screw scale is a continuous conveying equipment without disturbance traction components. It uses the rotating screw to push the transported materials along the fixed housing surface for conveying work. It is as if a non-rotating nut along the screw rod is performing a translational movement， and the force that prevents the material from rotating is the weight of the material and the friction resistance of the housing for the material.