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. 

Megosztás a facebookon

These screw holes are usually covered with blind plugs and separable bearings such as tapered roller bearings. When unloading a small-diameter bush, it is best to use a stepped punch. The oil is pumped through the oil hole on the tapered shaft to expand the inner ring to disassemble the bearing.

The small diameter of the punch matches the inner hole of the bushing. Several cutouts are provided on the housing shoulders.The punch is made of steel, the top of the hammer is processed into a spherical shape, so that the end contacting the workpiece is usually inlaid with soft metal, such as copper, aluminum, etc. Remove the outer ring of the interference fit.

Tighten the screws evenly while removing them. Use spacers to remove them with a press or gently tap them. Bearings with a large width can only be disassembled by using oil pressure and drawing fixtures together. A method of heating a part in a short time to expand the inner ring before drawing. It is better to use the nut as a stopper China INA Bearings .

The oil pressure method is adopted for the inner ring disassembly of large bearings. The large diameter of the punch is about 0. For the disassembly of large-diameter bushes and rolling bearings, casings are often used.5mm smaller than the outer diameter of the bushing. Disassemble the relatively small bearing with adapter sleeve, support the inner ring with the stopper fastened to the shaft, turn the nut back several times, and use the spacer to knock it off with a hammer.

To remove them from the holes, the method of unloading is also commonly used. When unloading, the hammered end face of the bushing should be cushioned. Sliding bearing bushings and rolling bearing jackets are interference fits in the holes

Megosztás a facebookon