Application Research Of Semiliquid Lubricating Grease In Mine Reducer

Along with the development of national coal industry, comprehensive mechanized mining coal method has been more and more widely used. The installed power of scraper conveyor, belt conveyor, reversed loader, elevating conveyor become larger and larger, and the corresponding reducers become bigger and bigger. However these reducer most in bad working conditions such as coal-dust, water, stone, mud and sand, and long time working under high speed and heavy load, the sealing parts easily are destroyed and leakage accident occurred frequently. On the other hand, in the little underground space and the poor radiation condition, lubricating oil temperature of long time heavy load working reducer is higher, and lubricating oil will soon deteriorate and lose efficacy. Therefore, under the condition of leakage and high temperature, the lubrication condition deteriorated quickly, and tooth surface veneer and bearing excessive wear will appear. This mechanization equipment are the important guarantee of coal high yield and high efficiency. How to ensure normal work of these devices has got more and more attention.Through analyzing mine gear reducer lubrication and failure mechanism, it gives the main failure forms and the main influence factors of mine-used gear reducer. According to the present question of mining gear reducer, mine reducer lubrication medium already cannot satisfy the use of modern mine deceleration equipment under high temperature, high speed and heavy load conditions, and reflect lubrication medium high temperature resistant property and extreme pressure property low, adhesion and membranous weaker, almost no possessing high temperature tightness. Aiming at these problems, it plans to use semiliquids to replace mine reducer commonly used grease—the N320 middling load lube. By simulation research and industrial test, that fully demonstrated its unique, excellent performance, and meted the requirement of modern mine reducer.Gear box fever failure is one of the main factors. Taking third pair of three-level cone-cylindrical gear reducer as the research object, it analysed flow field distribution in the model and the gear box temperature field necessary boundary condition. It mainly analyze two lubrication medium respectively in adhesion, high temperature resistant property, membranous and high temperature tightness through volume phase figure, temperature nephogram, speed nephogram and linear speed point diagram. The semiliquid lubricating grease is superior to the N320 middling load lube. In high temperature resistant performance, Comparing the average temperature of the meshing point, the N320 middling load lube is more than semiliquid lubricating grease for about 60℃;in high temperature tightness, semiliquid lubricating grease can automatically compensate less than or equal to 0.5mm between axes and sealing, between the welding or sealing surface, no leak and no pollution. Then the N320 middling load lube cannot compensate for less than 0.3mm between axes and sealing, between the welding or sealing surface. At the same time it finds that thermal equilibrium temperature changes more smoothly in gear box when the speed of input shaft gear reducer is below 2000r/min; when exceeding the speed, the gearbox thermal equilibrium temperature will rise sharply, and extremely easily causes grease failure. When the gear immersed depth is than 1.5 times depth of tooth, the temperature of gear meshing will exceed the highest temperature of gear box, and tooth surfaces wear and agglutination easily appear.Finally, in order to further investigate the practicability of semiliquid lubricating grease, we did the industrial test. Comparing with field application of the N320 middling load lube, semiliquid lubricating grease bears more good adhesion, high temperature resistant property, membranous and high temperature tightness; At the same time we had done demonstrated application cases for further application of semiliquid lubricating grease and further research of this topic. This paper has important reference value for similar lubricative system research, and has some practical directive significance for the correct choice and application of lubricative medium.