The weighing hopper feeder is a dynamic weighing and feeding method for the hopper scale. In the quantitative weighing device, an integrated mechanical and electrical equipment driven by an electric motor (commonly known as a screw feeder motor) is placed between the silo and the hopper. The electronic control device realizes the dynamic quantitative weighing of powder and granular materials. The powder and granular materials in the silo rotate with the rotation of the screw feeder mechanism and enter the hopper. There are three strain-type weighing modules between the hopper and the scale frame. When the set weight value is reached, the screw feeder motor is turned off to stop feeding, and the hopper door is opened to discharge the material, thus completing a dynamic weighing and quantitative feeding process.

The weighing reduction machine measures the change in weight obtained per unit time by using the weighing module. The change in weight is based on the actual feeding rate of the screw conveyor. The weighing hopper and the screw mechanism are regarded as the entire scale body. The weight signal of the scale body is continuously sampled by the weighing instrument or the upper computer, and the change rate of weight per unit time is calculated as the instantaneous flow rate. Then, through various software and hardware filtering techniques, the "actual flow" that can be used as the control object is obtained.

The weighing reduction machine controls the speed of the discharge screw conveyor based on the rate of weight reduction of the material in the weighing hopper to achieve the purpose of quantitative feeding. When the material in the weighing hopper reaches the lower limit of weighing, the discharge screw conveyor fixes the discharge volume according to the current speed and simultaneously controls the material in the silo to quickly drop into the weighing hopper. When the material is loaded to the upper limit of the scale, the loading stops. Rapid loading can shorten the feeding time, improve the accuracy of weighing and control precision. Through the fixed-value control of material quantities at each stage, automatic batching control and the collection and transmission of a series of signals are achieved during the production process, thus realizing precise control of feeding.