The weighing hopper system is mainly composed of a silo, a screw Feeder and a weighing hopper, etc. Materials and others are fixedly stored in the silo in sequence. The materials are then fed into the weighing hopper by the screw feeder. The weighing module is installed at the bottom of the weighing hopper to detect the weight of the materials. After the materials are discharged from the weighing hopper, they are collected through the summary hopper and fed into the transfer tank to complete the entire feeding function.

The screw feeder conveys the pile of materials out of the coarse feeding hopper and into the weighing hopper. The upper and lower weighing hoppers of the weighing hopper interlock and close at a certain frequency to weigh out 90% of the material by the predetermined weight. Then, the screw feeder feeds the weighed material back to the Electronic scale. The electronic scale accurately weighs the material and sends a signal to the control element. The control element receives the signal. Conduct an analysis and then send a control signal to the fine feeding mechanism to control it to convey the remaining weight of the material to the weighing hopper of the electronic scale. During the conveying process, the electronic scale dynamically weighs the weight of the material in the weighing hopper and sends a signal to the control element. When the weight of the material in the weighing hopper reaches the preset weight, the control element sends a signal to the motor that controls the screw. The motor drives the screw to push the materials in the weighing hopper to the hopper mobile trolley.

The weighing hopper system is composed of an upper computer, PLC, instruments and a frequency converter. The PLC adopts Siemens S7-300 and exchanges data with the upper computer via industrial Ethernet. The detection instruments and actuating elements are directly connected to the I/ O module of the PLC. The entire line is controlled by PLC programs. Programming uses ladder diagrams and is uniformly programmed in combination with the external characteristics of the controlled electrical system to achieve sequential control, logical control, interlocking and interlocking. Manual and automatic operation modes can be switched. The start and stop of the material trolley are interlocked. The system operates in a fully automatic mode. The upper computer operation interface adopts the dedicated human-machine interface software of Siemens, which is reliable and easy to operate. All operations can be completed by the mouse, and parameters can be displayed, modified and set. It is convenient to create dynamic process pictures, operation pictures, historical curves and real-time curves, etc. for the production plant and related raw material purchase settlement departments. Through the integrated information of quality and measurement, process adjustments and raw material and fuel settlements can be carried out.