Design And Development Of Real-time Temperature Monitoring System For Coating Machine

Coating machine is used for organic film coating and water-soluble film coating of tablets, pills, and candy. Coating machine is widely used in pharmaceutical, chemical, food and other industries. The status of the coat directly affects the quality and the tablets, and therefore should be monitored. Temperature distribution inside the coating machine is an important factor influencing the coating process. By monitoring the temperature in the machine, we can not only know the changes of real-time temperature in the coating machine, but also analyze the working conditions based on the temperature data to obtain the best coating status of the tablets.As the coating machine is a rotating body, it is difficult to apply the wired temperature measurement method. In this thesis, we take wireless technology and use four digital temperature sensor of DS18b20,MSP430F149micro controllers of MSP430series and wireless module of RF1100SE to build the lower machine hardware circuit for the acquisition and wireless transmission of temperature data. One of the four temperature sensors is used for measuring the ambient temperature. The other three sensors are inserted into different depths of the tablet bed with different distances from the wall. The receiving side of the MCU is fixed to the wall of the coating machine and rotates together with it. The measured temperature data are sent by the wireless transmitter module. The ROM address of the for temperature sensors is searched and distinguished by software programming in order to correspond to the temperature sensor and temperature data. Wireless receiver module and another micro controller is the receiving end for receiving the temperature data which will be taken by the host computer after processing and conversion.A software for real-time temperature monitoring is developed for the coating machine. This software consists of modules including serial communication, the choice of temperature channel, the acquisition of temperature data, the display of temperature curves and the save of temperature data. The number of temperature channel is recognized through the lower machine. The temperature data of four channels are shown in the coordinate axis. The temperature data can be imported into EXEL for further analysis.In this paper, a real-time temperature monitoring hardware and software system was developed based on the characteristics of the coating machine. Experimental tests demonstrated the effectiveness of the system. The system can be used for measurement and analysis of coating process and is valuable for practical applications.