The whole Filling system is composed of PLC(Siemens S7-200), Filling machinery, digital weighing sensor, frequency converter, servo motor, the system PLC accepts the weight standard signal of the digital weighing sensor, so as to control the frequency converter. The frequency converter controls the motor speed by changing the output frequency, so as to change the rotation speed of the feeding rotor pump on the filling machine to control the feeding speed. The main control is the switching control, except for a feeding motor, the other actions are completed by the cylinder, the whole system is controlled by PLC.

After the automatic filling machine starts, the filling machine clamps the packaging drum, while the digital weighing sensor starts, removes the tare weight of the packaging drum, and then the internal cylinder opens the feeding door (in the case of sufficient materials), the external servo motor drives the feeding rotor pump under PLC control to feed, when the weighing sensor does not reach the set fast loading weight, the system continues to rapidly feed; When the weight of the material reaches the fast loading set value of the weighing module, the weighing sensor gives PLC a fast loading end signal, and the PLC controls the output frequency of the inverter to change the speed of the servo motor to slow loading. When the weight of the material reaches the slow loading weight of the weighing module, the sensor gives PLC a slow loading end signal, the plug board closes and the control motor stops. After the weighing instrument gives the weighing end signal, the packaging drum is loosened and transported forward, and the whole process is completed.