What should be know about the mining locomotive bearing?

Bearings are very important for mining electric locomotives. They are the prerequisite to ensure the correct operation of the machine. Only by using the correct method can the bearing's service life be guaranteed, so that the equipment can work better for us, so our company professionals Introduce what things should be paid attention to when using bearings?

1. Tolerance selection and control of shaft and bearing chamber: After the bearing is pressed into the bearing, it should rotate flexibly without any sense of blocking. If there is obvious inflexible rotation, it indicates that the size of the shaft is too large and the tolerance needs to be lowered. If the bearing is pressed into the shaft and turned by hand, there is an obvious sense of "sand", it may be that the tolerance of the shaft is too large or the roundness of the shaft is not good. Therefore, when controlling the tolerance of the shaft and the bearing chamber, the roundness must be controlled. At present, many domestic manufacturers only control the tolerance, but do not control the roundness.

2. Prevention of foreign matter in the assembly: When the bearing is installed on the rotor for dynamic balancing, it is easy to enter the iron filings generated during the dynamic balancing into the inside of the bearing, so it is best to perform dynamic balancing before installing the bearing. For the convenience of assembly, some manufacturers apply some oil or grease in the bearing chamber for lubrication effect during assembly. However, it is often difficult for operators to control the amount. If a large amount of oil or grease accumulates in the bearing chamber, it will be very difficult when the bearing rotates. It is easy to enter the inside of the bearing along the shaft. It is best not to coat the bearing room with oil or grease. If it is absolutely necessary, it must be controlled not to accumulate in the bearing room.

3. The assembly method of the bearing: Because the bearing is a high-precision product, it is easy to cause damage to the bearing channel if it is improperly assembled, resulting in damage to the bearing. When assembling the bearing, there should be a special mold, which can not be knocked at will. When pressing into the shaft, only a small circle can receive force, and when a large circle is pressed, only a large circle can receive force. When assembling, it is required to use air pressure or hydraulic pressure, and the upper and lower molds should be outside the horizontal state during press-fitting. If there is an inclination, the bearing channel will be damaged due to the force, which will cause the bearing to produce noise.

4. Prevention of lacquer rust: The characteristic of lacquer rust is that it mostly occurs in sealed motors. The sound of the motor is very good during assembly, but after some time in the warehouse, the abnormal noise of the motor becomes very large. Remove the bearing. Severe rust phenomenon. In the past, many manufacturers thought it was a bearing problem. After our constant publicity, now the motor factory has realized that it is mainly the problem of insulating paint. This problem is mainly because the acidic substance volatilized from the insulating paint forms corrosive substances at a certain temperature and humidity, which causes bearing damage after corroding the bearing groove. At present, the problem can only be to choose a good insulating paint, and ventilate for a period of time after drying and assembly.

 

The life of a bearing is closely related to manufacturing, assembly, and use, and every link must be done well in order to make the bearing in the best operating state, thereby prolonging the life of the bearing.