The mixer adopts a master-slave communication structure, with one-to-many communication between the master and slave machines. The master is in the leading position to realize the communication management and control of each slave machine. The RS-232 asynchronous communication port of the industrial computer is connected with PLC after level conversion, forming a physical channel for communication between the upper and lower computers. The upper system is a master-slave bus type industrial local area network, with the upper computer as the master station of the industrial local area network communication, and all other PLCs connected to the network are slave stations. The upper computer adopts polling method, allocates the right to use the bus, and communicates with the slave stations one by one in a certain order.
020-34563445The feeding system (mixer) consists of basic automation system and secondary process computer system. The basic automation system includes automatic Batching system and HMI monitoring system, which completes basic control functions such as field data acquisition, process loop control, parameter setting, equipment sequence control, equipment operation monitoring and alarm. The secondary computer weighing and batching system completes the process control functions such as design plan, design model calculation, batching model calculation, batching liquid component logistics tracking, etc., and completes the automatic feeding control to realize accurate batching.
The automatic dosing machine calculates the formula according to the detection data and inputs it into the computer system through the man-machine interface or computer network. The batching control system automatically calculates the supply ratio of each raw material according to the detection data and the process formula, and then the PLC control system synthesizes the supply speed of each raw material supply system to accurately and continuously complete the raw material proportioning according to the process sequence.
The weighing control system measures the speed of the spiral operation, converts it into corresponding pulse signals, and sends them to the computer after photoelectric isolation. The computer communicates with PLC to detect the flow rate and the running state of the feeding motor. After the instantaneous flow is calculated by the computer, it is compared with the required flow, and the computer outputs the corresponding speed regulating signal. After photoelectric isolation, DA is converted into a speed regulating signal of 4-20mA, and the operating frequency of the frequency converter is adjusted, so as to control the operating speed of the feeding motor and achieve the purpose of controlling the feeding amount.
The feeding system mainly realizes automatic production and whole process control, and provides a complete set of automatic production lines for the requirements of raw material storage, automatic weighing, batching, transportation, mixing, coarse crushing, fine crushing, constant temperature storage, compression molding, polishing, testing, finished product storage and environmental protection. The system adopts three-dimensional or plane structure design. Among them, intelligent automatic batching system plays an important role in improving management level, improving product quality and maintaining product stability. After years of continuous technical innovation and improvement, the batching system has been well received by customers.
Process control flow of feeding system:
1. The special touch screen is used as the man-machine interface, and the system operation is direct, reliable and simple. The operator can modify the batching parameters online at any time according to the requirements of product technology, dynamically monitor the whole working process, display real-time data and alarm.
2. The weighing control system can compile and store multiple production formulas according to requirements for the operators to call and modify at any time.
3. The metering system uses PLC as the main control element, and directly collects the data of the on-site weighing sensor through the 16-bit high-precision A/D conversion module of PLC, and directly controls the output according to the programming, thus reducing other intermediate control links. The system has good stability and reliability, low failure rate, and adapts to various harsh working environments. Using PLC for direct control, the system is extensible and the program is easy to understand. Factory technicians can add functions at any time as needed.
4. The field PLC and computer directly form a network through RS485 communication, which realizes the remote monitoring of the system and provides more advanced conditions for enterprises to realize automatic management.
5. The faults of the Weighing system can be displayed directly through the touch screen, and the maintenance personnel can quickly remove the faults according to the fault display, which is convenient for maintenance.
6. The high reliability and direct control of the batching system make the batching speed fast and the batching accuracy high, which greatly improves the production output and product quality.
7. Automatic batching has a high degree of automation, which can complete multiple configurations at the same time, reduce labor input and improve the labor intensity of operators. At the same time, the complete automatic control of the whole feeding and batching control is realized.
