1.The operating principle of programmable control technology
According to the number of I/O points of programmable logic controller (PLC), it can be divided into three types: small computer, medium computer and mainframe. Although there are many types of PLC, their structure and principle are basically the same. Its internal storage executes user-oriented operation commands such as logic operations, sequence control, timing, counting, and arithmetic operations, and controls various types of machinery or production processes through digital or analog input and output, and its related peripheral equipment and industrial control system form a whole, so as to achieve the purpose of control. The structure of PLC mainly includes CPU, memorizer, power supply, dedicated input and output interface, data bus and so on. PLC first converts the continuous action of the filling machine into a programming language, then inputs and outputs the controller according to a certain algorithm, and then the corresponding components receive the signal from the controller to make corresponding physical actions, so that the pharmaceutical equipment production line can be automated.
2. The main application of PLC in the vial filling production line
As the core component, PLC collects switching signals from various photoelectric sensors or limit switches, and analog signals such as pressure, temperature, liquid level, and flow to control the main motor, electric heating tube, peristaltic pump, and various solenoid valves.
(1) Application of PLC to vial bottle washing machine
Oven mesh belt lacks bottle high speed, dynamic production at half speed, full bottle shutdown graded control host speed; injection water temperature, water pressure and compressed air pressure lower limit alarm and shutdown; low liquid level stops circulating water pump; bottle output counting; host overload stop and prompt.
(2) Application of PLC to vial filling machine
No bottle no filling, no bottle no stoppering, on-line sampling, production count, lack of stopper alarm, lack of bottle shutdown. In case of overload or emergency, the vial filling machine can be shut down immediately, and after troubleshooting, the start button needs to be pressed again to resume production. It runs online with other equipment, and when there are too many bottles in the front bottle unscrambling table, stop the bottle conveying belt of the oven and the bottle washing machine.
(3)Application of PLC to sterilizing and drying oven
Connect the touch screen to read process parameters; control the speed of the mesh belt motor and each fan through the frequency converter, and monitor the operation of each fan, such as overload and low wind speed damper position; PID controls the temperature of the heating tube, and detects the heating tube and the preheating section, high temperature section, and cooling section temperature; connect the printer to print the data or curves recorded in the production process.
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