Automatic filling scale adopts communication technology, industrial Ethernet technology, artificial intelligence control technology, distributed database technology and the whole network distributed control technology, and adopts position servo control to accurately control the stroke of the piston cylinder, which also achieves the purpose of accurately controlling the filling volume, collecting liquid viscosity, temperature and pressure, and realizes the stroke compensation of the piston cylinder through certain compensation algorithms. The DSP receives the position instruction signal from the PLC, and superposition the quantitative weight and compensation weight given by the PLC as the total quantitative given. After the quantitative signal is adjusted by the compound feedforward controller, the speed instruction signal is formed. The deviation signal after comparing the speed instruction signal and the speed feedback signal is adjusted by the speed loop proportional integral controller, the current instruction signal is generated. After vector transformation in the current loop, torque current is generated by SPWM to control the operation of AC servo motor, and the filling process is controlled by the number of pulses generated by the rotary encoder per revolution.

Weighing and Filling machine After the pneumatic piston valve in the Weighing system fills the filling barrel, the weighing module will detect the filling target value in the weighing line after the filling is completed, and the information will be quickly transmitted to the terminal computer. The hardware module of the Filling system is mainly composed of the main control board, A/D conversion, man-machine exchange, filling valve, pneumatic ball valve, photoelectric isolation transmission, etc. The main control board circuit is mainly responsible for completing the control and calculation of the weighing system. The signal acquisition circuit is mainly responsible for filling the corresponding instructions and completing the collection of the target value in the filling. And pass the pressure value to the next set in the form of A signal A/D conversion circuit is mainly responsible for converting the signal transmitted from the upper level into a signal that can be effectively processed by the computer, man-machine switching circuit is mainly responsible for parameter setting and monitoring the operation of the control system, photoelectric isolation circuit is mainly responsible for signal isolation and transmission. And eliminate the interference between the actuator of the system and the hardware circuit; The output signal amplifier circuit is mainly responsible for the appropriate amplification of the output signal in the system, so as to facilitate the actuator to carry out the next step.