With the continuous improvement of industrial automation technology in tobacco industry, a large number of pneumatic film control valves are equipped in the heating and humidification system of cigarette making line, which is used together with other detection and execution devices to realize the parameter control of steam, water, hot air and other objects, so as to ensure the process indicators of temperature and moisture in the online processing process. Tobacco companies use electric / pneumatic positioners and valves. In the process of using, the valve is not in place, resulting in equipment failure, resulting in the fluctuation of cut tobacco processing process indicators. In order to ensure the reliable and correct operation of pneumatic diaphragm control valve in production, inspection and spot inspection mechanism are adopted to prevent the occurrence of faults.
pneumatic diaphragm valve application:
The core of the process index control is to control the flow, temperature and moisture of cut tobacco. Each main machine of the silk production line is collected through the electrical control system, such as infrared moisture meter, electronic belt scale, temperature sensor and other signals. Through the collected cut tobacco moisture, tobacco flow, cut tobacco temperature and other indicators, combined with the requirements of online processing process indicators, the electrical control system outputs control signals to control the opening of relevant solenoid valves and pneumatic membrane valves, so as to achieve control The aim of this paper is to determine the temperature and moisture content of cut tobacco. As the ultimate end of the actuator of electrical control system, the quick and reliable action of pneumatic diaphragm valve is directly related to the processing environment and the amount of steam and water added, and ultimately affects the internal quality of cut tobacco processing.
The pneumatic diaphragm valves on the silk production line mainly include vacuum moisture regain, blade moisture regain, blade moisture regain, HT, scraper stem moistening machine, etc. to control steam and water flow, while blade feeder, stem feeder and stem expander control steam flow.
pneumatic diaphragm valve structure and working principle:
The pneumatic diaphragm valve is composed of an electric positioner and a valve with a rod support, which is equipped with an electric / pneumatic positioner and a valve.
(1) working principle of electric / pneumatic positioner. ① It is used to maintain the corresponding relationship between the position of the valve stem and the output of the electrical control system; ② the received signal is compared with the valve stem stroke of the regulating valve, and then the pneumatic signal pressure is generated to adjust the valve stem stroke and control the valve opening to achieve the control purpose.
(2) Valve working principle. The process medium flows through the valve in the direction of the valve arrow, and changes the valve core position by changing the signal pressure (working range) acting on the actuator diaphragm. The stem is connected with the actuator rod through the rod connector and sealed by the packing ring pressed by the spring.
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