Henan zhengkuang mining Machinery Co.,Ltd have two specifications of the same cement mill, the hollow shaft of the original sliding bearings, each cement mill motor power 380kW, grinding body for the ball, loading capacity 35t, monthly production of 350t, grinding feed to share a platform HL500 fork hoist supply. February 2009, in which a platform to bearings, changed after the motor power 350kW, ball load capacity of 32.5t, other conditions remain as previously used, as more than a year after a run, cement mill is on the use of two kinds of bearings for a comparison .
Cement mill Comparison of Bearing,Plain bearings1 general 3 years pouring every 4,000 yuan of lead-based alloys need, therefore, bearing wear maintenance cost of 1,333 yuan annually. First to join oil 120kg, 2 times a year for the oil, add half of the operation of oil per 15kg. The oil price of 5 yuan / kg, the annual cost for the (120 × 2 +15 × 2 × 10) × 5 = 2700.cement mill Rolling2 sets of rolling bearings of the price of 9 million, a 10-year design life, bearing wear planned depreciation 09,000 yuan / year. When I first joined Grease 60kg, adding a month to run in 8kg, grease price of 7 yuan / kg, the annual cost for the (60 +8 × 10) × 7 = 980.cement mill Comparison of motor power consumption factor cosφ = 0.85, by 3 phase voltage and current data, using the formula P = UIcosφ computing power compared energy consumption shown in Table 1.Average of 3 times the results, cement mill Rolling bearing energy than 4.3kW, rate 1.3%. If the tariff by 0.5 yuan / kWh meter, the difference in tariff 4.3 × 300 × 24 × 0.5 = 15480.cement mill Conclusion,Depreciation by bearing wear, oil consumption and power consumption compared to bearing the cost of wear and fuel consumption more than 5947 yuan a year bearing, but the ball of cement mill Rolling Bearings in to save electricity than 15,480 yuan.
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