Generally, the oil pipe temperature is lower than other pipes.3 Fever caused by improper assembly of the bearing itself The matching between the inner hole of the bearing and the shaft adopts the basic hole system, and the matching between the outer circle of the bearing and the bearing seat hole adopts the basic shaft system. If the inspection and replacement are not timely, it will cause heating, abnormal noise, vibration, etc.

The oil return pipe of the bearing seat is thin, and the temperature is lower in winter, and the oil return becomes slow. After pressing the upper cover, the outer ring of the bearing is deformed and flattened, and the radial clearance becomes smaller or almost zero. Because of the severe friction between the rotor main shaft and the bearing end cover after thermal expansion under working conditions, the high temperature generated in a short time The end cover of the bearing seat and the end face of the rotor shaft are welded together.

Whether it is ordinary bearings or special special bearings, the main engine has high requirements for its life, performance and reliability. When the oil level is marked under the oil mark, the actual measurement shows that the lowest row of balls of the bearing has just touched the oil surface. The process requires that the heating oil temperature is controlled at 80℃～90℃, generally not exceeding 100℃, and not exceeding 120℃ at most. Although the rolling millChina INA Bearing bearings of PY and JY have been specially ordered, due to the unstable quality of domestic large-scale bearing manufacturing, pitting and peeling of the inner surface of the rolling ring still occurred, which caused the bearing to fever and the roller press frequently tripped and stopped accidents., which will lose its lubrication effect and cause the bearing to suffer from high temperature. 1 coal mill reducer is mainly caused by the excessive axial clearance of the bearing and the incorrect tooth surface meshing.

The main reasons for the problems are as follows: The main reason for the initial free end bearing heating and burning is that the outer race is tightly pressed, and the bearing cannot produce axial displacement with the expansion of the main shaft. Because the impeller wears more seriously, the rotor balance is poor after wear, and the fan vibrates greatly, which often causes the bearing to fail prematurely. 

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It is used to produce non-concentric or shaft deflection parts between the shaft and the shell, and the alignment parts required by high temperature, low cold, corrosion, and magnetic field non-insulation. Ceramic bearing one-way thrust ball bearing A single thrust ball bearing is composed of a washer-shaped ring with a ball rolling raceway and a cage assembled with the ball. 

Electrically insulated bearings: Because of the high resistivity, they can avoid arc damage to the bearings and can be used in various electrical equipment requiring insulation. Precision instruments and other fields. Ceramic bearing self-aligning ball bearing The outer ring raceway of the self-aligning ball bearing is spherical and self-aligning, which can supplement the error caused by the misalignment and shaft deflection. Generally, glass fiber reinforced nylon 66 (RPA66-25), special industrial plastics (PEEK, PI), stainless steel (AISISUS316), flavonoids (Cu), etc.

From the past, it has only been applied in a small range of high, precise and cutting-edge fields, and has been gradually extended to various industrial fields of the national economy. Third,China roller bearing ceramics are less affected by thermal expansion and contraction than steel, so when the bearing gap is constant, the bearing can be allowed to work in an environment where the temperature difference changes more drastically. 4. Ceramic bearing single row angular contact ball bearing (Technical grades: P4, P5, P6, P0) Angular contact bearings are suitable for high-speed and high-precision rotation, and will not affect their accuracy in high temperature, magnetic field, water, etc.

It is suitable for high-speed rotation, low-noise, low-vibration occasions or high temperature, high cold, corrosion, magnetic field, non-insulation and other fields where steel bearings cannot be used. Ceramic bearing hybrid Ceramic balls, especially silicon nitride balls, have the characteristics of low density, high hardness, low friction coefficient, wear resistance, self-lubrication and good rigidity. 

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Cooperating relationship problem: No matter how high the accuracy of the parts is in the processing process, it will never reach 100% of the mating surface of the part. Normal fatigue wear of metal, which is an inherent characteristic of metal itself; Operation and maintenance problems: including poor lubrication of bearings, high operating temperature caused by blockage of the cooling system, loosening of fastening devices, etc.

For a long time, the solutions for bearing wear of high temperature fans are nothing more than the following: repair welding and processing, electric brush plating, thermal spraying, repair welding machining, thermal spraying repair process cannot be implemented online repair, although electric brush plating can achieve online repair , But the requirements for the wear depth are more stringent. Is there a better solution besides that? Soleil carbon nano polymer material technology can realize the wear of high temperature fan bearing position.

Installation problem: The installation position of the bearing cannot be well controlled or the clearance of the bearing cannot be effectively controlled during the installation process, resulting in the bearing cannot be in an optimal state during the running process, and the running resistance increases, the temperature rises, and the torque More acts on the mating surface, causing relative movement between the inner ring of the bearing and the shaft surface, causing wear of the shaft. Under the premise of normal maintenance of the equipment, the service life after repair is even higher than the service life of new parts.

Therefore, the small bearing surface of the mating part is also one of the root causes of metal fatigue and wear; There are many reasons for high temperature fan bearing wear, which can be summarized as the following points: This technology uses the material's unique mechanical properties and targeted repair technology to repair the wear of large shafts such as fans on-line. Case show: high temperature fan: main shaft diameter is 160mm, speed is 1500r/min, the bearing position on the transmission side is worn, the wear width is 80mm, and the wear depth is about 0.

From the microscopic view, the mating surface of metal can only achieve 30%-50%. The advantages of this technology for repairing high temperature fan shaft wear are as follows: Good adhesion, compression resistance, wear resistance, and comprehensive mechanical properties such as elastic deformation of metal to Wholesale Mechanical ball bearing Factory achieve online repair, high repair efficiency, and no A large amount of equipment needs to be disassembled, and the repair is usually completed within 8 hours; This technology is similar to a cold welding technology, which does not generate high temperature during the online repair process, and protects the equipment body from damage, and the repair process It is not limited by the amount of unilateral wear of the shaft; After repair, there will be no metal fatigue and wear during use.5mm.

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