The automatic batching control system can realize the automation and intelligence of the whole process from batching and measuring, mixing to discharging, and also has a series of management functions such as browsing, inquiring, counting and printing of data. Each hopper of the batching machine is equipped with a weighing instrument, which collects the amount of each material in real time, transmits the weight to the touch screen, and realizes the control of motors and valves through PLC according to the comparison with the set parameters. The touch screen carries out real-time monitoring of various process parameters, including the setting of the set value, the amount of advance, the cumulative amount and so on. The touch screen completes the processing of weight data and PLC for communication, real-time monitoring and data storage.

The feeding system adopts the workflow design method, which can design a reliable and beautiful graphical interface to meet the needs of on-site production, so that the on-site equipment in the monitoring screen real vividly. The touch screen not only realizes the display of system parameters, but also dynamically displays the operating status of each device. The soft buttons on the touch screen can remotely control the opening and closing of valves, pumps, mixing and other equipment.

Feeding control is the most important part of the whole dosage control, which is completed by touch screen and PLC. In the whole dosing process, the initial fast dosing and the late slow dosing are used to feed the material in two steps, so as to minimize the falling error caused by the large impulse. After stopping the feeding, factors such as the properties of the material itself, the valve or the motor speed will be the direct cause of the final weighing accuracy. By analyzing and processing the past feeding error, predicting the future error and compensating in advance, the weighing terminal makes the actual weighing value fluctuate within a small range above and below the set value, and the more times of weighing and the longer time, the more the actual value tends to the set value.

Hardware composition of the dosing control system is composed as follows:

(1) The touch screen adopts an all-steel structure with anti-shock, anti-vibration, anti-electromagnetic interference, built-in special power supply has a strong anti-interference ability, using the base plate + CPU card structure, has a strong scalability.

(2) PLC selected Siemens S7-200, instruction-rich, fast execution speed, easy debugging and troubleshooting, with flexible terminals and powerful communication functions, in addition to a rich variety of expansion modules to meet the needs of different users. At the same time provides advanced programming features, easy to configure, easy to install, can easily replace the simple relay and complex medium-sized automation application system. With the touch screen using PPI communication protocols, can be convenient and effective data transmission.

(3) The weighing instrument is characterized by good sealing, small volume, low power consumption, easy installation and simple operation. In the high temperature T work interference and high frequency switch action and other harsh environmental conditions, and has a strong adaptability. It adopts MODBUS master-slave network communication protocol with the touch screen, and collects the weight of materials in real time through the weighing module and transmits it to the touch screen after processing, which is characterized by high weighing accuracy and good reliability.