Application of DC Motor in Industrial Mixing process

摘要

A stirred tank mixer is a batch equipped with an impeller or other mixing device to provide efficient mixing. A stirred tank runs at steady state with continuous flow of reactants and products; the feed assumes a uniform composition throughout reactor, same composition as in the tank. On the basis of end-use industry, mixing process in stirred tank mixer market can be segmented as, Chemical industry, Pharmaceutical industry, Bio-fuel industry, Food industry, Paint industry etc. Mostly embedded system programming is employed for enabling the rotation of the continuous tank stirrer using dc motor. In an automated system a PLC controller is usually the major part of a process control system. With the execution of a program stored in program memory, PLC continuously monitors status of the system through signals from the input devices. Based on the logic implemented in the program, PLC determines which action to be executed with output coils. In our project, the level of the liquid in the tank is sensed by the level sensor and according to the level detected the speed of the stirrer which is connected to the motor is varied by PLC depending on the signal given as input to PLC from the sensor.