The batching system adopts the master-slave structure, with the industrial computer as the upper host and Siemens PLC, frequency converter and weighing instrument as the lower slave. The host is in the dominant position to realize the communication management and control of each slave computer. The RS-232 asynchronous communication interface of the industrial computer is connected to the PLC after the level conversion, forming a physical channel for the communication between the upper and lower computers. Another RS-232 port of the host is connected to the communication port of the weighing instrument to form a second physical channel.

The automatic batching system can control the material to be fed into the designated silos. There is an interlock alarm system composed of rotary level sensors on the silos, which is used to start and stop the elevator and the scraper feeder. At the bottom of each silo, there is a screw feeder. During batching, according to the top-mounted formula, the weighing system performs program control to push each screw feeder to feed materials into the hopper scale one by one for weighing. The weighing procedure is one material one weighing. When the sixth batch of materials is fed to the double-screw mixer, the double-screw mixer is started to mix the materials that enter successively. After the mixture is uniform, the double-screw mixer begins to feed materials into the finished product silo, and the next batch of batching and weighing will be carried out after the feeding is completed.

The automatic feedback batching system can control the amount of materials fed into the conveyor by adjusting the opening degree of the gate. A weighing module is designed on the screw feeder to weigh the raw materials on the conveyor in real time. The conveying speed of the conveyor and the quality of the raw materials will all be uploaded to the control system. Combined with the allowable loading capacity of the hopper, the weighing control system will monitor and adjust the working status of the system in real time to ensure the precise transportation of raw materials.