Compare in terms of bearing wear, depreciation, fuel consumption and power consumption between sliding bearing and rolling bearing
Our company has 2 sets Φ2.2mx7.5m cement mill machine. The hollow shaft of the cement mill originally used sliding bearing. The motor power of each mill was 380kW, the grinding body was steel ball, the loading capacity was 35t, and the monthly output was 350t. The feeding of grinding head shared one HL500 hoist for forking supply. In May 2002, one of them was changed to rolling bearing. After the change, the motor power was 350kW and the steel ball loading capacity was 32.5t. Other service conditions are still the same as before. After more than one year of operation, the service conditions of the two kinds of bearings are compared (the annual production period is calculated as 10 months and 300D).
1. Comparison of bearings
1) Sliding bearing
The sliding bearing (lead base alloy tile) of our company is generally poured once every three years, and the lead base alloy needs 4,000 yuan each time. Therefore, the average annual cost of bearing wear and maintenance is 1,333 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 (120X2 + 15 x2 x 10) X5 = 2,700 yuan.
2) Rolling bearing
The price of two sets of rolling bearings is 90,000 yuan, the design service life is 10 years, and the planned depreciation cost of rolling bearing wear is 9,000 yuan / year. Add 60kg grease for the first time and 8kg grease every month during operation. The price of grease is 7 yuan / kg and the annual cost is (60 + 8x10) X7 = 980 yuan.
2. Comparison of power consumption
Motor power factor cos φ= 0.85. By recording the data of voltage and current for three times, calculate the energy consumption comparison with the formula P = √3UI cos φ. As shown in Table 1.
Table 1 Comparison of power consumption of two types of bearings
Frequency | Bearing type | Voltage / V | Current / A | Power/kW | Energy saving of rolling bearing compared with sliding bearing/kW |
The 1st time
| sliding bearing | 350 | 650 | 335 | 5 |
rolling bearing | 350 | 640 | 330 | ||
The 2nd time
| sliding bearing | 380 | 620 | 347 | 3 |
rolling bearing | 380 | 615 | 344 | ||
The 3rd time
| sliding bearing | 360 | 630 | 334 | 5 |
rolling bearing | 360 | 620 | 329 |
On average, the results of three times show that the energy saving of rolling bearing is 4.5% higher than that of sliding bearing 3KW, amplitude 1.3%. If the electricity charge is calculated at 0.5 yuan / kWh, the annual electricity charge difference is 4.3 x 300 x24 x0 5 = 15,480 yuan.
3. Conclusion
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 cement ball mill with rolling bearing is 15,480 yuan less than that of sliding bearing.
More about Sliding bearing technology update :
Sliding bearing is a bearing that works under sliding friction. The sliding bearing works stably, reliably and without noise. Under the condition of liquid lubrication, the sliding surface is separated by the lubricating oil without direct contact, which can also greatly reduce the friction loss and surface wear, and the oil film also has a certain vibration absorption ability. However, the starting friction resistance is large. The part of the shaft supported by the bearing is called the journal, and the parts matching the journal are called the bearing bush. In order to improve the friction properties of the bearing surface, the antifriction material layer cast on its inner surface is called bearing lining. The materials of bearing bush and bearing liner are collectively referred to as sliding bearing materials. The application of sliding bearing is generally under the condition of high speed and light load.
Compared with rolling bearing, the utility model of sliding bearing has the advantages of convenient disassembly, simple structure, quiet operation and can bear medium and large impact load.
Marginal is a company mainly engaged in sliding bearings. Welcome all of you to contact us to know more!
Marginal Bearing has successfully developed various bearing materials with many different standard bearing sizes, including Three-layer Metal-polymer, self-lubricating bearings, Two-layer, metal-polymer, self-lubricating bearings, Bi-metal composite, self-lubricating bearings, Copper wrapped boundary lubricating bearings, High performance steel bearing, Plastic compound materials bearings and Filament wound composite materials bearings.
Applications covered are automotive industry, construction machinery, plastic manufacturing machinery, OA machinery, material handling equipment, dock side machinery and hydraulic transmission parts. In brief, our bearings can be used wherever there is rotation or linear motion between mechanical parts where lubricating is not allowed or external lubricating accessibility is limited.
With more than 10 years of experience on the researching, producing and promotion of self-lubricating bearings, Marginal Bearing can deliver not only high-performance products but also high-quality services, such as material selection, simulation test, engineering design and installation. The self-lubricating bearing and technology is now performing its beneficiary roles in the traditional industry area and further more providing variable solutions in the industry areas related to our daily life such as the public transportation, entertainment, energy, civil construction, environment protection facilities and aerospace industry.
