The liquid Filling machine has a memory function and adopts manual and automatic control schemes. Manual control is mainly used for emergency treatment and process debugging. The core unit of automatic control is PLC, and the core part of control is Siemens S7-200 PLC, which is responsible for collecting input signals and issuing control commands to the executive mechanism after program processing. The PLC and the host computer are connected through the communication cable, and the input signal is transmitted to the PLC at the same time, the PC will also obtain the data and display it synchronously through Kingview. Set up material filling display window, set up database variables and complete attribute definition. By means of attribute definition, space, strategy and so on, the design of dynamic screen is completed, the storage attributes of data variables are set up, and the data query and curve browsing are established. Establish the communication connection and parameter setting of external devices to achieve remote monitoring and data management functions.

The automatic filling machine automatically removes the tare weight when filling, and the material is injected into the container with a large amount of rapid filling and then a slow and small dose correction and measurement. When the container is sent into the weighing platform, the conveyor runs at the same time, and the photoelectric sensor detects that the signal sent after the arrival of a container controls the motor to stop. The photoelectric sensor detects the signal sent when the container reaches the filling position, the PLC controls the conveyor to stop, the automatic peeling and filling valve is driven down by the stepper motor, and the drop limit is reached by the stroke switch to send a signal, and the PLC controls the filling valve to fully open for filling. When the set value is reached, the solenoid valve moves the filling valve to open half for filling, and at the same time, the stepper motor drives the filling valve to rise through the lead screw at a pre-set speed. When the filling weight requirement is reached, the filling valve is closed, the filling valve reaches the upper limit, the stroke switch stops sending a signal, and the PLC simultaneously controls the motor weighing conveyor to run at the same time until the finished product is output. Then the container is placed on the electronic weighing platform, and the barrel mouth is aligned with the filling mouth. At this time, the program starts, the filling mouth automatically drops, and the filling valve is opened to feed. The filling nozzle rises to complete the filling process. In order to ensure the accurate and reliable operation of each part of the filling process, the sensors, relays, switches and solenoid valves are controlled by PLC program. After the filling barrel is placed on the conveyor belt, it is transferred to the filling position by the conveyor, and the proximity switch arranged in the filling position automatically senses, and sends the sensing signal to the PLC control system, which controls the conveying motor to stop rotating, and controls the lifting cylinder to drive the roller arm up, and moves the filling barrel to the filling gun position. The photoelectric sensor at the port of the filling gun automatically senses the position of the filling barrel, and the cap suction device starts to suck the cap away; Then the filling gun begins to fill the liquid into the filling barrel, and the weight signal of the liquid in the barrel is transmitted to the PLC control system by the weighing module. When the predetermined weight is reached, the PLC controls the filling gun to stop filling, the cap suction device automatically seals the cap, starts the conveying motor, and carries the filling barrel away.