The analog signal received by the weighing distribution system is converted into a digital signal through the a/d module of the processor, and then compared with the preset temperature value, the liquid volume change is calculated. The real-time temperature is displayed on the TFT LCD screen. The weighing signal is initialized with the batching, and the tft touch screen chooses to send a timed sampling command to count the pulse signal of the batching output, and then calculates the corresponding weight according to the conversion formula, combined with the influence of temperature on the volume of liquid, calculates the amount of material, and compares whether it exceeds the preset value. Further, the design requires the control of the switch closure of different electromagnetic valves to accurately control the dosage.
020-34563445The function of the reactor Batching system is to raise the temperature of the batching liquid, fine tuning of the mixing ingredients, dilution, decomposition, mixing, inclusion control and uniform temperature treatment to improve the quality of titanium dioxide. It is an important production link between the resin and the batching process, and can coordinate the production rhythm of the rotary reactor weighing and batching machine, in which a controllable amount of powder is put into the batching liquid to mix. To precisely control the chemical composition of the ingredients.
The feeding system consists of a two-stage process computer system, and the automatic system includes the batching system and the HMI monitoring system, which complete the basic control functions such as field data acquisition, process loop control, parameter setting, equipment sequence control, equipment operation monitoring and alarm. The two-stage computer completes the process control functions such as design plan, design model calculation, batching calculation, batching liquid component logistics tracking, and so on. The two-stage batching jointly completes the automatic feeding control of the reactor, realizes the accurate batching and automatic feeding functions, and timely controls the variety and quantity of the added materials.
The S7-400 of Siemens is adopted, the CPU board is CPU414-2DP, and the Ethernet is used to communicate with L2 and above systems. The control station has five ET200 remote I/O stations, which communicate using PROFIBUS-DP interface. System programming software STEP7, software platform based on MicrosoftWindows2000/XP operating system, easy to install, friendly interface. Monitoring software using WonderwareINTOUCH, picture graphics, data reading and writing, communication configuration, trend record, alarm record and so on are very convenient. The system layout is reasonable, the network operation is stable, and the communication is smooth.
The process control computer system of metering mixer is composed of server, development and maintenance terminal, operation station and corresponding Ethernet. The server adopts disk array technology to ensure the reliability of system data. The server, development and maintenance terminal and operation station are installed in the reactor operation room and connected by star Ethernet. Secondary computers communicate with basic automation through servers; The server realizes the data communication with the upper computer system through Ethernet.
