Volume Mixing and feeding system uncertainties and internal and external interference as a whole for processing, the use of digital technology to compare and analyze it with the traditional PID controller, weighing controller to calculate the actual amount of feed, when the actual amount of feed to meet the feed set value to close the feed valve, from the whole process of action can be seen, the valve closure lag will inevitably lead to feeding error, the value of the error is about the lag time and the closure of the instantaneous volumetric flow rate, The error value is the product of lag time and instantaneous volume flow rate and fluid density at the time of closing, in which the lag time is all the time between the output of the valve closing signal from the weighing controller and the shut-off valve shutting down, "i.e., including the lag time of the relay's action and the shut-off valve's action lag time.
020-34563445The volumetric mixing and feeding system is a complete set of automated equipment that realizes dynamic weighing and batching control through electrical control management and visual human-machine software configuration. The electrical control part of the system adopts Siemens PLC and is programmed and controlled according to production requirements. The software adopts human-machine configuration. According to the process requirements, it controls the weight and flow rate of the materials loaded into the weighing hopper through the monitoring system and PLC program, thereby achieving precise measurement and batching. The system features strong stability and high cost performance, and can provide accurate measurement data and control means for production control and management in various industrial sites.
The uncertain factors and internal and external interferences of the feeding system are treated as a whole. Digital technology is utilized to compare and analyze it with the traditional PID controller. The weighing controller calculates the actual feeding amount. When the actual feeding amount reaches the feeding set value, the feeding valve is closed. From the entire action process, it can be seen that the lag in the valve closing action will inevitably cause feeding errors. The error value is approximately the product of the lag time and the instantaneous volume flow rate and fluid density at the time of closing. The lag time is the total time from the output of the valve closing signal by the weighing controller to the full closure of the shut-off valve, which includes the action lag of the relay and the action lag of the shut-off valve.
The feeding system is composed of Siemens series PLCS, circuit breakers, relays, frequency converters and terminals, all of which are selected from well-known domestic and foreign brands. Compact in structure, stable in operation and complete in functions, it is equipped with overload, short circuit, phase loss and other protections, and can achieve equipment automation and process automation control. The system adopts high-end configuration software as the upper computer. Instructions are issued through the upper computer to manage the automated equipment and processes. It takes the standard industrial computer software and hardware platform as the integration carrier to replace the traditional system, featuring strong adaptability and good openness.
