The batching control system mainly includes host computer, batching controller, various component silos, frequency conversion screw unloader and control valve group, batching scale and mixer, etc. As the master station, the controller communicates with the host computer and the proportioning scale through Profibus. Download recipe and set ingredient parameters via upper computer. The batching controller automatically selects the bin according to the formula requirements, starts the frequency conversion screw discharger and control valve under the corresponding bin, reads the material quality of the batching scale for detection and judgment, and controls the speed of the discharger according to the adaptive multi-speed control algorithm to realize the control of the discharging speed. If the final weighing mass is within the allowable error range, the blanking of the component will be completed, if it is greater than the allowable error, it will sound an alarm, the group will be processed by the operator into the mixer, and then the next component dosing will begin. The system will automatically fine-tune the ingredients parameters before the next batch of ingredients. After all the ingredients are weighed, the blender begins mixing according to the recipe setting process.

In order to obtain the best accuracy and speed of the batching process, a multi-variable speed batching control strategy was proposed, which divided the batching process into three stages: high speed batching, slow batching and pulse batching. The multistage variable speed batching control curve includes the speed curve of the discharger and the quality curve of the batching scale. The parameters such as fast/slow switching point, pre-cutting point, fast/slow switching time, speed of the discharger and maximum number of batching pulses can be set by the host computer.

At the beginning of the batching, the speed of the discharger is very high, and the material quality of the batching scale increases rapidly. At the beginning of the batching, the speed of the discharger is very high, and the material quality of the batching scale increases rapidly when it reaches the mass of the fast and slow switching point. The discharger completes the fast and slow switching time within the fast and slow switching time, and the target time of the slow batching is set as when the mass reaches the pre-cutting point, the discharger stops discharging due to the existence of "air unloading". The material quality will increase in the stable time at the end of the stable time. First, the weighing result is within the allowable error range, indicating that the setting of the batching parameters is very good, and the current parameters are saved; Second, the deviation is too large, exceeding the positive deviation of the target quality, the ingredient can not adjust the result, need to adjust the ingredient parameters; Third, the deviation is too large and lower than the negative deviation of the target mass.