Liquid filling machine is a highly automated packaging equipment, its main function is to liquid materials into a predetermined set of weight. In the filling process can effectively avoid the material overflow, to prevent the maximum extent of the material itself on the environmental pollution, so as to effectively protect the operator labor. The system is stable and reliable, easy to operate and accurate in filling. It mainly consists of filling gun device, PLC system control part, weighing system, filling rack table, conveying equipment and so on.

The methanol filling machine reads the data stored in the chip through the interface of the weighing module, processes the data of the weighing module through the serial port, and is responsible for receiving the polling signal sent by the server to the base station to give the response information. If the communication frame is the data frame sent by the server to the base station, the data sent by the weighing module is directly sent to the serial port sending buffer. The received data is checked and simply analyzed and sent to the serial port receiving area to ensure the stability of the signal.

Automatic filling machine has human-computer interaction, communication, display and storage, printing and other functions, which can realize real-time process data monitoring, set up alarms for running process events and switch between manual and automatic control. The computer downloads the program and monitors the operation of the equipment through Ethernet PLC on-line. The computer communicates with PLC through Modbus 485 communication protocol to display the running status of the equipment and set the running parameters for starting and stopping the equipment. The actuator is responsible for executing the commands from the PLC and performing the corresponding actions.

The main electrical control part of the filling machine is a Siemens S7300 series PLCCPU317-2PN/DP. The filling valve control part is a control system module EX484. Siemens PLC is responsible for the safety functions, speed control, high level buffer tank level control, return cycle heating, CIP in-situ cleaning, height adjustment, signal exchange, etc. The control system is composed of Siemens PLC buses. Siemens PLC control system consists of two buses, Profibus and ASI bus. The filling machine is responsible for filling valve metering cylinder level control, tank filling level control, filling valve pneumatic control, filling angle time control and so on. The filling valve control is composed of two buses: Powerlink bus and CANbus bus.

The filling machine calculates the position information of the circular filling port in the image of the barrel cover surface, namely the filling port radius, the filling port center mark and the height of the oil gun. The corresponding position information is transmitted to the stepper motor control system, and the motor control system drives the shaft stepper motor according to the pulse instruction issued by the computer, and drives the oil gun to run above the filling port to realize automatic positioning and filling.

Propanol filling machine is driven by stepping motor to drop down to reach the lower limit position, the well is signaled by the travel switch, and the PLC controls the filling valve to open fully for filling. The use of local area network realizes the communication between the field computer and the equipment, through the RS485 network can communicate with the filling machine each other. The use of multiple filling machines can easily constitute a RS485 distributed control system network.

Metering filling machine open filling after the conveyor began to run, the main control system exercise PLC as the main control element, photoelectric input signals servo motor action cylinders and so on for the output components. Automatic filling production online real-time monitoring, microprocessor through serial communication with the PLC real-time data processing and data entry based on the precise control of the industrial computer and PLC. Fully intelligent upper computer industrial computer constitutes a two-stage filling control set of electromechanical signal processing and communication as one of the filling equipment, reasonably share the upper monitoring and on-site data acquisition and control tasks.

Small material filling machine through the cylinder drive a piston to extract and hit the material with a one-way valve to control the flow of materials, with a reed switch to control the cylinder's stroke to regulate the amount of filling, the use of weighing module and weighing instrument connected with a data line, in the process of measurement of electronic scales of pressure signals are constantly transmitted to the weighing instrument, in the preset quantitative weight to control the meter control to stop the pump, close the pneumatic valves.

The ton barrel filling machine adopts manual and automatic control scheme, PLC is responsible for collecting the target value input signals and sending control commands to the actuator after program processing. The material filling display window is established, database variables are created and attribute definitions are completed. Through the means of attribute definition, space, strategy, etc., complete the design of dynamic screen, set up the storage attributes of data variables, establish data query and curve browsing. Establish communication connection and parameter setting of external equipment to realize remote monitoring and data management function.