The bearing device of the motor shall be checked:

1. Oil leakage is not allowed because grease or oil may splash on the coil, which affects the electrical conductivity and damages the insulation.

2. Attention must be paid to the operation of the bearings, which shall be run uniformly. If abnormal noise is found, stop the machine and check it in time.

3. The grease or oil sample shall be taken out regularly for inspection. If the color is dark and contains water or impurities, the grease or oil shall be replaced when the bearing is dirty or hot. When changing grease or oil, the bearings or bearing shells and journals shall be cleaned and dried with gasoline.

4. The time for replacing lubricating grease of rolling bearing shall be carried out according to the provisions of oil filling sign on the machine base. The lubricating grease can be replaced without stopping. The grease is added from the oil cup with grease pressure injector, and the waste oil shall be removed by the oil drain pipe.

5. The inner and outer rings of rolling bearing shall be tightened under normal conditions and shall not be loose. If it is found that the outer ring of the bearing rotates in the bearing chamber or the inner ring of the bearing rotates on the rotating shaft, it shall be repaired immediately. The outer ring rotation is due to the loose bolts fastening the bearing cover. The inner ring rotation is due to the loose stop screw on labyrinth ring or oil dump plate, or the loose locking round nut. If serious damage is found, the bearing, rotating shaft, bearing, end cover and bearing sleeve must be replaced.

6. Check whether the sealing ring and gasket are worn, burnt, aged, deteriorated, etc. if any, they must be replaced to ensure the sealing of the whole bearing device is good. The surface of the felt gasket should be coated with grease or oil to avoid wear and burn.

7. When preparing to use a motor that is not used for a long time, the rolling bearing must be cleaned with gasoline and then injected with lubricating grease in the bearing chamber 0.5-0.7 cavity. If too much grease will not only cause oil leakage, but also the bearing will overheat during operation, causing grease decomposition. After the bearing is filled with grease, the rotor of the motor shall be easily pulled by hand.

How to deal with the problem of broken shaft of reducer?

Electrical energy is converted into mechanical energy. In the process of energy conversion, pulley or coupling is installed on the output shaft to transfer torque through belt or coupling to drive the equipment to work. In addition to the poor concentricity of the output end assembly of the reducer, if the output shaft is broken, the motor shaft will be broken on the load side, which may mainly occur at the front bearing support, the obvious knife mark, the joint of the rib plate and the main shaft, the shaft shoulder and the groove. According to the detection research and analysis, the following points can easily deal with the problem of broken shaft.

Type selection or material defects: the wrong type selection results in insufficient output of the machine. Some users mistakenly believe that as long as the rated output torque of the selected reducer meets the working requirements, in fact, it is not. First, the value obtained by multiplying the rated output torque of the motor with the reduction ratio is in principle less than the rated output torque of similar reduction provided by the product sample, The other is to consider the overload capacity of the driving motor and the actual working torque. Theoretically, the working torque required by the user. It must be less than 2 times of its rated output torque. If the instantaneous torque of the output shaft of the reducer exceeds 2 times of its rated output torque, and the acceleration and deceleration are too frequent, the shaft of the reducer will be broken eventually. When the selected materials are high-quality carbon structural steel and alloy steel without effective heat treatment, the material properties are poor and the strength is not enough.

If there is a problem in the installation of the equipment, the motor shaft often has various grooves (such as over travel groove, unloading groove, etc.), step transition and shaft shoulder structures in the design and process. If the groove structure is unreasonable or uneven, the transition fillet is too small, and the shaft diameter changes greatly, the output shaft and its load of the reducer are stuck under the action of alternating stress, At this time, the overload capacity of the drive motor will continue to increase its output, the stress distribution of these parts will be extremely uneven, and the micro cracks will gradually form and expand in the parts with high stress, and finally lead to sudden brittle fracture. In particular, some applications must strictly abide by this rule, which is not only the protection of the machine, but also to avoid the output shaft of the reducer motor being twisted off.