Determination of fluidization velocity The fluidization velocity of the gas in the sending tank directly affects the working state of the fluidized bed. The velocity of the fluidized bed should be controlled between the critical fluidization velocity uc and the suspension velocity uf of the particles. The critical fluidization speed and suspension speed of the material are first calculated, and then combined with the observation results of the flow pattern in the conveying pipe, the flow velocity of the fluidizing air in the sending tank is controlled within a certain range. The control scheme of the fluidized conveying process In a simple conveying process that does not have strict requirements on the instantaneous flow of materials, the material conveying flow can be changed only by adjusting the flow of fluidizing air from the bottom of the sending tank into the tank. The correspondence table between the fluidized air flow rate and the material mass flow rate obtained through the experiment is stored in the control program, so as to control the material flow rate. In order to achieve precise control of the instantaneous flow of materials, PID control and intelligent control methods are adopted to keep the pressure of the sending tank during the transportation process stable. â‘ PID control algorithm in the pneumatic conveying process. Integral separation PID control algorithm is used in the tank pressure stability program, that is, when the deviation value is large, PD control is adopted to avoid excessive overshoot and make the system respond faster; deviation When it is small, PID control is adopted to ensure the control accuracy of the system. The PID parameter setting adopts the critical proportional degree method. â‘¡Intelligent control strategy in the pneumatic conveying process When the gas in the sending tank is in a high-pressure state, its compressibility is more obvious and has a strong nonlinearity; in addition, the two-phase flow in the fluidized sending tank during the conveying process is very complicated and cannot be Obtaining its precise mathematical model, traditional PID control will cause overshoot and instability. The actual application shows that the control effect is not very ideal. Therefore, expert control and fuzzy control control strategies are introduced in the process of tank pressure control. Realization of pneumatic conveying control system Appropriate control strategies need to be implemented with precise control means. Industrial computer (IPC) is used as the host computer to monitor and manage the entire system. Programmable logic controller (PLC) as the lower computer performs reliably And effective decentralized control. This distributed distributed control system integrates the strengths of computer and PLC, and realizes the integration of control and management. The sensors used in the pneumatic conveying control system mainly include pressure sensors, weighing instruments, flow meters, etc., and adopt the online weighing method to measure the mass flow of materials and the level of materials in the sending tank. The main actuator of the pneumatic conveying system is a pneumatic valve. The software design of the control system includes the design of the lower computer software, the upper computer software and the communication program between them. In addition to the functions of general data storage, data query, flow chart display, curve tracking, system security management, etc., the software of the host computer also adds the functions of selecting the control mode, sound and light alarm function, data summary and report printing. The main tasks of the lower computer software are data collection, communication with the upper computer, data transmission and the realization of some control functions. The system software uses MCGS configuration software for programming, and the main software module of the pneumatic conveying control program. This Medical Nursing Model is a great value way to train nurses or students in the correct technique for human body care. Made of PVC Material, Ensure Longer Service Time.Is a rare tool for Medical Training Teaching ang relevant practical training. Medical Nursing Training Model Nursing Manikin Model,Medical Training Model,Training Theories And Models,Medical Nursing Training Model Xinxiang Vic Science&Education Co.,Ltd. , https://www.labmedicalscience.com