The dosage scale consists of an industrial computer, a PLC, an industrial weighing instrument, a frequency converter, a vibration motor, a mixing machine, a sensor, a conveyor belt and other components. PLC provides human-computer interaction interface, completes the functions of control information input, data management, data display, storage, statistics and reports, etc. According to the operator's instruction, it reads a certain numbered recipe, and then according to the proportion and sequence of ingredients in the recipe, PLC sends out the instruction to start the batching, which makes PLC able to start a specific frequency converter.

Batching scale to achieve material transfer, batching control, formula design, production data management and other functions. And it can realize the collection control of multiple ingredients through the network. With PLC as the next machine ingredients, once the production plan is completed in the entire production process, the computer will weigh each raw material according to the plan, no longer need manual intervention. In this process, the worker only takes the material, and the computer checks the weight through the data sent by the electronic weighing, which reduces the work burden of the worker and improves the work efficiency.

The electrical part of pneumatic batching scale is mainly composed of weighing sensor, weighing instrument, programmable controller (PLC), inverter, industrial computer and printer. In the process of dynamic weighing, the weight signal of the weight sensor on the quantitative weighing hopper is received. When the weight of the material in the hopper reaches each set value, the output I/O quantitative signal to the PLC. PLC collects the quantitative output signal of the weighing instrument, and controls the output frequency of each frequency converter through PLC, so as to control the thickness and fine feeding amount of the corresponding vibration feeder and the switching door action of each weighing hopper.

The weighing hopper system measures through the weighing module, and compares the measured value with a given value (the given value is determined by the ratio of material A and material B) and the measured value, and then transmits the result of the comparison to the PLC's A/D analog module, and then transmits the control signal (4-20mA current signal) through the PLC's D/A analog module to the electric regulating valve, and then controls the servo motor in the electric regulating valve to open the electric regulating valve to control the size of material B inlet. The control signal will control the servo motor in the electric control valve to adjust the opening degree of the electric control valve, so as to achieve the control of the feeding size of material B.