In automation products in the application of tunnel sterilization oven

Abstract: this paper mainly introduces in mechanical and electrical automation platform in tunnel sterilization oven application technology in electrical control system. Project adopted the company ES series PLC, AE series touch screen, M series inverter, DTC series temperature controller, Modbus bus communication, history data management, and other sets of monitoring, collection, control, alarm, record and print function in the integration of control systems. Keywords: dry sterilization PLC controller touch screen inverter Modbus bus 1 introduction tunnel sterilization oven is the pharmaceutical industry form a complete set of equipment for the glass container on drying process. Learned on the design of similar products at home and abroad advanced experience and technology, overcome the similar equipment of China's current production volume, low production capacity, heat preservation performance and purification effect is bad shortcomings, applicable to antibiotic pharmaceutical factory after cleaning the glass bottles, ampoule, yellow round glass containers such as sterilization oven process. Process automation design 2. 1 process description tunnel sterilization oven is mainly composed of conveyor mesh belt, the heating cabinet, purifying device, cooling air exhaust device, cooling box body, electric heater, mechanical transmission mechanism and electric control system, etc. After ultrasonic cleaning equipment for cleaning the glass bottles, ampoule, yellow circle of antibiotics such as glass container is transported through the transmission device to tunnel sterilization oven entrance, through the loop drive conveyor mesh belt, glass containers after preheating, sterilization, heat preservation antivirus after sterilization, three sections of heating area are transported to the next level of the equipment. 2. 2 control content and function requirements ( 1) A manual start. In automatically when there is no press the start button for manual state, at this point, the ventilation, cooling, into the bottle, mesh belt, heat preservation, sterilization, preheat button start stop separately. Ultrasonic cleaning button in the condition of water to start, has nothing to do with automatic/manual operation. Anhydrous conditions started, will be prompted to system failure. （ 2) Automatic startup. Automatically start button for automatic state, after the cooling fan starts, after the delay set time, fan start into the bottle, after the delay set time, exhaust fan, set the delay time, preheat start heating, set the delay time after sterilization heating start, after the delay set time, heat preservation heat start, when three temperature preheating, sterilization, heat preservation at the same time more than three temperature setting thresholds, mesh belt, motor start frequency set lower limit frequency operation according to the mesh belt motor speed, when the temperature of the three are + - set temperature is reached 15 degrees, mesh belt motor run set frequency. （ 3) Stop control. In the process of running, when press the urgent stop, only stop mesh belt motor, loosen the urgent stop mesh belt motor continue running. Scram for normally open point. （ 4) Automatic stop. Automatic running, press the stop button after, just stop mesh belt motor, preheating, sterilization, heat preservation should be stopped manually, when temperature is less than three automatic stop temperature limit, can be manually stop exhaust, cooling, bottle feeding machine, otherwise, cannot stop. To automatically start again, press the start button automatically, system according to the step 3 automatically. （ 5) Automatic diagnosis report to the police. When the automatic operation after start-up, if three heating after heating temperature to determine time, still cannot reach the set temperature lower limit, you will be prompted alarm; When the exhaust temperature has been larger than exhaust temperature limit, after exhaust temperature judgment time, system will prompt alarm; Temperature compensation for temperature and temperature sensors doesn't conform to the compensation of the temperature sensor. Compensation for - temperature Between 50-50 degrees. Touch screen display temperature low temperature to - 50 degrees, is less than. . . 50 degrees, the display will appear more than 500 data, at the same time temperature controller DTC prompt ERROR, ERROR of red light. （ 6) Automatic recording. Temperature curve records 5 minutes a temperature value, maximum record for 15000 times, when more than 15000 times, a new record will cover the earliest data, so on, the power to keep the data curve. 2. 2. Three 10 preheating, sterilization, heat preservation temperature display the current value is less than or greater than the set temperature lower limit on the set temperature, the system will prompt overrun errors, on the top of the start button will be displayed at the same time of orange light, prompt overrun. 3 sets of automation products solutions based on the platform of sets of mechanical and electrical automation platform control scheme is shown in figure 1. Figure 1 control scheme diagram 3. 1 HMI touch screen process management with delicate and exquisite AE series touch screen, a variety of language freely switch, a large number of primitives gallery, powerful online and offline simulation function, formula trends and data storage and print function can meet the demand of all kinds of craft, see figure 2. Figure 2 3 main control picture. 2 use convenient and flexible system integration design ES series PLC, integrated high-speed count function, scanning speed, support floating point arithmetic, built-in Modbus bus communication way. M series inverter, integrated Modbus bus communication port, simple tree interface operation, miniature shape; Good torque characteristics and precision of speed regulation. DTC series temperature controller, integrated Modbus bus, highly integrated, easy to integrate in the control cabinet, simple setting, control of high temperature. Temperature controller self-tuning images as shown in figure 3. Rapid Modbus communication, simplifies the complex connection between PLC controller and frequency converter, temperature controller, eliminates the conventional control method of various unsafe factors, potential do not need to change any connection way of multi-mode free switch make the control more simple, the real-time feedback information to ensure system reliable operation.
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