Understanding the Failure Factors and Corresponding Measures of Skeleton Oil Seals:
- Seals are widely used in chemical, coal, petroleum, transportation and machinery industries, and have become the basic components and accessories of various industries. The sealing effect of equipment will directly affect the performance and normal operation of the whole machine. The sealing performance of the equipment is also an important indicator to evaluate the quality of the whole machine. How to prevent the leakage of the seal and improve the sealing performance is a problem worthy of discussion.
- First of all, we need to understand the factors that cause the failure of the skeleton oil seal, such as damage to the lip of the skeleton oil seal and wear of the shaft;
Damage Factors of Skeleton Oil Seal Lip:
- The long-term use of the skeleton oil seal will lead to high temperature carbonization and wear failure of the rubber, and the grinding and wear of the seal caused by the continuous high-speed, high-temperature sliding contact between the shaft and the skeleton oil seal. The peripheral speed of the shaft is also a key factor affecting the sealing effect. Abrasion, burns and cracks cause the failure of the oil seal and shorten the life of the oil bell.
- The oil seal cannot be used due to wear and burn of the lip. When the oil seal is installed, a small amount of lubricating oil can be applied to the sealing lip and the shaft. During operation, the lubricating oil in the box seeps out slightly, forming an oil film on the sealing surface. state is the most ideal state. At the same time, ensure that the mounting hole of the oil seal is perpendicular to the axis. If it is not perpendicular, the lip of the oil seal will squeeze out the lubricating oil from the shaft, causing the lip to fail due to dry friction between the oil seal and the shaft due to lack of oil;
Shaft Wear Factor:
Due to the long-term use of the reducer, the wear of the shaft seal is excessive, and in some serious cases, a V-shaped groove even appears. Once this groove is formed, the interference between the diameter of the oil seal lip and the shaft diameter becomes smaller, resulting in the oil seal lip The contact pressure with the shaft decreases, and the oil film easily seeps out from the groove marks, eliminating the sealing effect of the skeleton oil seal; at the same time, the surface roughness of the shaft has a great influence on the performance and service life of the oil seal. If the roughness is too low, the oil seal is easily squeezed out from the sealing contact surface, so that the oil film becomes thinner and the lip is heated. If the phase roughness is too high, the shaft will easily scratch the lip after high rotation, which will make the sealing surface hairy, the friction torque will increase, and the lip will quickly wear and cause leakage;
If the surface roughness of the input and output shafts is too large, a grinding machine should be used for grinding to ensure proper surface roughness; for the shafts with larger dimensional wear at the axial seal, the shaft seal should be brushed first, spraying and other repair treatments, after using the machine tool to process to the required size and accuracy, it is recommended to chrome-plated the shaft sealing position to increase the wear resistance of the shaft.