Research On The Flameproof Intrinsically Safe Water Level Sensor About Measuring And Controlling

Coal is the one of the important sources. The automatization of the coal industry production and the development of information are the important symbol of the productivity development level. The development of coal industry has in close touch with new design, new arts and crafts, new equipment, new material, and new technique. However, the electron of exploitation and the application of computer and automatization technology are very important aspect of coal industry technology reconstruct.As the rapid development of computer control technology, PLC, which bases on microcomputer, has taken the place of relay control technology by and by; it is widely used in the automatization area in every walk of life, including the coalindustry. But at present most of the drainage systems in coal mine are still controlled by relay control system, the on and off and switch of water pump are operated by workers, it can't switch on and off the pump automatically according to the water level and other parameters, it affects the management level of primary water pump house and economic benefits seriously.The production of a modern coal mine is about ten million tons annually, the hydranlic discharge in mine is abundant, the central pump house is equipped with big water bunker, in laneways and excavation area there are many small water bunkers pump water to the central bunker by pipes; in central pump house there are several primary pumps (for example 3), the matched motor is above 1250KW generally, and there are several drainpipe lines. When the hydranlic discharge is normal, one work, one standby, and another one for preparation. Other water bunker in general has one pump-to-pump water to the central bunker; the power of the pump is relatively small. Depending on the advancement and reliability of PLC, this essay shows a design of flameproof intrinsically safe detector and controller,which implements the PLC control over the pump in the distributed water bunker, primary pump, the vacuumizing system and the electric valves in the pipe attached to it, it detects the run parameters automatically.It can display dynamically, and it obligates communication interface, which will transmit the date to the production attemper center on the ground, it can implement the function of real-time inspection, alarm and display. The flameproof intrinsically safe detector and controller controls the pump to work alternatively and starts the standby pump timely, it attempers several pump to work reasonably. If the system is built up by the obligate communication interface, various of parameters collected by the flameproof intrinsically safe detector and controller is transmitted to the inspection center on the ground, then the finger, photo, data, and text on the touch screen can reflect the status of the system, the water level, the current and temperature of the motor, the temperature of the bearings, and the flux of the drainpipe, and it can exchange the data with the mine synthesis detection and control host computer, working reliably , operated easily, andhighly automatized are features of the system ,it also cuts down the run fee of the pump.Sensors are the key to the realization of the automation system, in local situation, except some sensors work well, the performance of most sensors is not stable , their reliability is low, the longevity of service is not long, these factors will affect the function of automation system. In this essay, in the exploitation of sensor, in order to adapt to the development of computer and automation technology, to improve the performance of the sensor, the new design can amend the error and non-linear, it can restrain the influence of the environment factors, it can implement the function of self detection and self adjustment, it has a flexible mode of display and output.this essay has important meaning in making the best of the modern information technology, speeding up to informize the coal industry, sharing the information resource, improving the level of management. At the same time, i...