The liquid filling machine will send the empty barrel to the filling position and align the barrel mouth with the spray gun mouth. When the detection spray gun is in place, the bottom valve will be opened and the nitrogen filling valve will start to fill the dry nitrogen into the barrel through the filling mouth, so that the air in the barrel will be replaced by nitrogen, and the drying of the inner wall of the barrel can be accelerated to ensure the safety of filling. When filling with nitrogen, it should be ensured that the air in the container is completely replaced, and the specific amount of nitrogen can be adjusted by the controller time.

The automatic filling machine adopts Siemens PLCS7-300 system, which consists of weighing module, PLC system, touch screen, alarm system, on-site pressure change, solenoid valve and other components, and the operating station adopts DELL industrial computer WINXP operating system, and designs the process control of filling scanning, filling management and other process control with programmable controllers, and installs the software based on Configuration King based on the relevant database information service. The monitoring interface of the automatic filling production line, the operation interface is simple and applicable, easy to modify, and realizes the complete man-machine dialogue state. the PLC control system and the operation station can carry out rapid communication and setting through the RS-422/485 interface.

Automatic filling machine can meet the user's requirements in various aspects, with perfect operation, alarm records, all data can be online query and print, and expand the channel switching, shift automatic conversion and other auxiliary functions. Perfect database and report function, can modify the query and print reports can be online. The operator can modify or re-enter the target value being used online, and the system will run according to the new filling weight after confirmation.

Automatic filling scale is realized by weight sensing and the input pulse frequency fast or slow, when the frequency of the pulse occurs to decrease, the speed of the stepper motor decreases; when the frequency grows, the speed is accelerated. In order to achieve the purpose of measuring size adjustable and improve the accuracy of measurement, the screw's speed is required to be adjustable and the position is positioned accurately, the stepping motor is used to control the screw's speed and rotation, which not only simplifies the mechanical structure, but also makes the control very convenient. Without overloading, the speed and stopping position of the stepping motor only depend on the frequency of the pulse signal and the number of pulses, and are not affected by the change of load.

The weighing and filling machine is mainly composed of four main parts: transfer device, filling device, suction and sealing device and detection electronic scale device. Integrate informationization accessory equipment, such as printers, scanning guns, RFID and other information identification equipment, to give the material into the weighing and dispensing process of identifiable information. Adopt CS control management server as the server to manage the whole filling. The industrial Ethernet is used as a network to connect the operating stations of each process. An operator station is placed at each process and connected to each process equipment. Functions of each station are realized by the operator station.

The control system of the quantitative filling machine mainly consists of PLC, touch screen, actuators, and detection elements. The computer downloads the program and monitors the operation of the equipment through the Ethernet PLC on-line. The touch screen communicates with PLC through Modbus485 communication protocol, displaying the running status of the equipment, and starting and stopping the equipment to set the operating parameters and other operations. The actuator is responsible for the execution of the PLC instructions, the specific implementation of the corresponding action. The detecting element sends the status and parameters of the equipment to the PLC.

The automatic filling machine consists of programmable controller and electronic scale to form a two-stage computer control network, integrating automatic control technology, electronic scale measurement technology, weighing module sensor technology, computer management technology in an integrated mechatronic control system; adopting open control mode, strong compatibility and open database. It can be accessed to factory LAN through Ethernet, which can realize the integration of management and control. It has the advantages of digital display of weight value, dynamic display of process screen, formula modification management, fast filling speed, high control accuracy, etc. It adopts the upper computer completely on-screen control system, with the functions of automatic storage of filling data, inquiry of list of filling process, and statistics and printing of class, day, month and year reports.

The weighing and filling machine integrates computer technology, automatic control, communication technology and weighing technology into one, and adopts programming software and field equipment library in accordance with IEC-1131 international standard, providing continuous control, sequential control and high-level language. The field device library provides a large number of commonly used field device information and function blocks, which can greatly simplify the configuration work and shorten the engineering cycle. SCL can be used to program user function blocks, using the IEC-1131 standard, the function blocks generated by SCL can be called many times in the CFC. The user can program the mathematical model of the process and the optimal control strategy into function blocks with SCL and download them directly into the controller. In this way, the optimized control of the process can be fully realized.

The automatic liquid filling machine uses high precision stainless steel rotor pumps to measure the liquid volume, each pump is driven by a servo motor and the filling volume can be adjusted directly on the touch screen. The valves are driven by servo motors for lifting and lowering, and the bottom-up screw drive can be used for filling foamy liquids. Determined by time and flow rate per unit time, determined by programmable logic controller (PLC) control, the operating status is monitored through the human-machine interface-touch screen, and the operating parameters can be modified online.