Research On Speed-Limited Protection Device Of Mine Pneumatic Pump

Mine pneumatic pump is one of the important equipment in the auxiliary drainage system of coal mine fully mechanized and driving working face, safety study on mine pneumatic pump has an important application value for coal mine safe production, which is the key dispensable important component and guarantees coal mine safe production. Meanwhile, the safety study also plays the most important role in guaranteeing the safety of works operating mine pneumatic pump and other equipments. Through the analysis and study on structure characteristics and working condition of mine pneumatic pump, we can find threat it is necessary to carry out a comprehensive research on safe speed-limited protective device of mine pneumatic pump if accelerating the popularization and application of mine pneumatic pump in coal industry in our country. Otherwise, when pneumatic pump works without loads, it is easy to cause shaft propeller racing of pneumatic pump with the creasing of wind energy, which can cause the dismemberment of working turbine and safety accidents of metal debris harming workers or equipment.Based on study and analysis of working principle and structure of safety speed-limited protective device, the performance parameters can be pointed out influencing the working characteristics of pneumatic pump,and the main structure of pump can be gived, which can supply a theoretical basis for designing the safety speed-limited protective device of mine pneumatic pump. The theoretical discussion on air turbine system has been carried out by the comprehensive application of air dynamic, theoretical mechanics and materials mechanics and so on, meanwhile, the calculation method on turbine and speed of air turbine has been summarized, and we can attain that its highest speed is14735r/min when pneumatic pump turbine system works without loads. It is easy to harm the safety the problem of safety on mine pneumatic pump, three design schemes are supplied on safety speed-limited protective device, which are friction safety speed-limited protective device^air limited safety speed-limited protective device and automatic control safety speed-limited protective device.According to the study on structure characteristics and working condition of safety speed-limited protective device of mine pneumatic pump, the evaluation criteria and evaluation index system are put forward concretely. Three of safty speed-limited productive device of mine pneumatic pump are evaluated by the combination of fuzzy evaluation and weighted scoring method, the evaluation device is best, automatic control safety speed-limited protective device is best, automatic control safety speed-limited protective device is better, but friction safety speed-limited protective device geted low scores because of its safety problem.