The sliding bearing (lead base alloy tile) of our company is generally poured once every three years, and the lead base alloy needs 4000 yuan each time. Therefore, the average annual cost of bearing wear and maintenance is 1333 yuan. Add 120kg lubricating oil for the first time, change the oil twice a year, and supplement 15kg oil every half month on average during operation. The price of the lubricating oil is 5 yuan / kg and the annual cost is (120 yuan) × 2＋15 × two × 10) × 5 = 2700 yuan.
The price of two sets of rolling bearings is 90000 yuan, the design service life is 10 years, and the planned depreciation cost of rolling bearing wear is 9000 yuan / year. Add 60kg of grease for the first time and 8kg per month during operation. The price of grease is 7 yuan / kg and the annual cost is (60 + 8) × 10) × 7 = 980 yuan.
Motor power factor cos φ= 0.85, record the data of voltage and current for 3 times, and use the formula P power = uicos φ. The average results of three times show that the energy saving of rolling bearing is 4.3kw, with an amplitude of 1.3%. If the electricity charge is calculated as 0.5 yuan / kWh, the annual electricity charge difference is 4.3 yuan × three hundred × twenty-four × 0.5 = 15480 yuan.
Through the comparison of bearing wear depreciation, oil consumption and power consumption, the wear and oil consumption cost of rolling bearing is 5947 yuan more than that of sliding bearing every year, but the annual power cost of ball mill with rolling bearing is 15480 yuan less than that of sliding bearing.