The weighing screw conveyor is composed of a large screw conveyor, a small screw conveyor, a stirring mechanism, a material Weighing system, a frame, a silo drive device, Weighing modules and a speed detector, etc. By the rotation of the screw, the material is pushed to move along the axis in the cylinder in a directional manner, and is conveyed to the elastic opening at the top. The conveying and metering are completed through the variable pitch screw structure.

Designed based on the principle of gravity weighing, this is an automatic metering device integrating mechanics and electronics. The material sent out by the concealed flow system is conveyed to the feeding port of the screw machine scale body by the Feeder. When the material is conveyed at a constant speed through the screw machine scale body, the speed signal of the screw shaft is transmitted to the weighing instrument by the speed detector installed at the shaft end (or the speed signal is obtained from the motor reducer) At the same time, the gravity of the material acts on the weighing bridge frame. The gravity signal generated by the ear shaft support point on the bridge frame and the weighing module is also input into the secondary instrument. The weighing instrument amplifies the signal, and the cumulative weight and flow rate obtained through A/D conversion operation are displayed on the weighing instrument panel. The material after measurement is sent to the next level of equipment from the discharge port of the scale body.

After the equipment is started, the stirring mechanism begins to operate to prevent the materials in the silo from warping and affecting the continuous conveying of the materials. The screw conveyor is composed of a stepping motor, a reducer and a screw shaft with screw blades. The rotation of the screw shaft causes the powder material to move relatively along the screw surface. The material is not rotated together with the screw blades due to the frictional force of the trough or the wall of the conveying pipe, thus pushing the material along the axial direction and achieving the conveying of the material. When the material is put into operation, both the large and small screw conveyors work simultaneously. The operation of the large screw conveyor can improve the efficiency of material feeding. When the weight of the material in the pallet reaches a preset weight value (the preset weight value is generally set to about 95% of the final weight value of the material), the load cell sends a signal to the control system, and the control system controls the stepping motor of the large screw conveyor to stop working. At this point, only the small screw conveyor continues to work to achieve the purpose of precise feeding.