1. Small machines can be rotated by hand to confirm whether the rotation is smooth. The inspection items include poor operation caused by foreign objects, scars, and indentations, unstable torque caused by poor installation and poor processing of the mounting seat, excessive torque caused by too small clearance, installation errors, and seal friction, etc. wait. If there is no abnormality, the power operation can be started. Large machines cannot be rotated by hand, so cut off the power immediately after starting without load, run the machine idling, check for vibration, noise, contact with rotating parts, etc., and enter power operation after confirming that there is no abnormality. Power operation starts from low speed with no load, and gradually increases to rated operation under specified conditions. The items to be checked during the test run are whether there are abnormal sounds, changes in bearing temperature, leakage or discoloration of lubricant, etc. If any abnormality is found, stop the operation immediately, check the machine, and remove the bearing for inspection if necessary.
2. The bearing temperature can generally be estimated according to the external temperature of the bearing seat. However, it is more accurate to directly measure the temperature of the outer ring of the bearing by using the oil hole. The bearing temperature gradually rises from the start of operation, and usually stabilizes after 1 to 2 hours. If the bearing is not installed properly, the temperature will rise sharply and abnormally high temperature will appear. The reasons are such as too much lubricant, too small bearing clearance, poor installation, excessive friction of the sealing device, etc. In the case of high-speed rotation, the wrong choice of bearing structure and lubrication method is also the reason. Check the rotation sound of the bearing with a stethoscope, etc. If there are strong metal noise, abnormal sound, irregular sound, etc., it indicates abnormality. The reasons include poor lubrication, poor precision of the shaft or housing, bearing damage, foreign matter intrusion, etc.
3. From the two aspects of the reason for use and the internal factors, we can see the reasons for the actual effect of the bearing. The use factor mainly depends on whether our use method is reasonable. The internal factor is actually a question of our level when we choose the bearing! !The use factor mainly refers to whether the installation adjustment, use maintenance, maintenance and repair meet the technical requirements. The installation condition is one of the primary factors in the use factors. The bearings are often caused by improper installation, which leads to changes in the stress state between the parts of the whole set of bearings, and the bearings operate in an abnormal state and fail early. According to the technical requirements of bearing installation, use, maintenance and maintenance, the load, speed, working temperature, vibration, noise and lubrication conditions of the running bearings are monitored and inspected, and if any abnormality is found, immediately find the cause and make adjustments to make it Back to normal. In addition, it is also important to analyze and test the quality of grease and the surrounding medium and atmosphere.
Keep bearings and their surroundings clean
Even tiny dust, which is invisible to the naked eye, can have adverse effects on bearings. Therefore, keep the surrounding clean so that dust does not invade the bearing.
Use with caution.A strong impact on the bearing during use will cause scars or indentations, which will cause accidents. In severe cases, it will cause cracks and fractures, so attention must be paid.
Use bearing-specific tools.
Special tools must be used and cannot be replaced at will.
Avoid bearing rust.
Sweaty hands can cause rust when handling bearings. Pay attention to operate with clean hands, wear gloves as much as possible, and pay attention to corrosive gases.
