Description

Installation parts and functions
High-speed rotating parts of high-speed wire mill - pre-finishing mill stand, finishing mill adopts high-speed oil film bearings, its speed has reached 120~130m/s, representing the advanced level in this industry.
The oil film bearing is sealed with lip seals. Double lip seal is a key spare part for oil film bearings, which has two important roles: Seal the lubricating oil in the bearing chamber to ensure the formation of a continuous oil film. Seal the external cooling water, rolling oil, iron filings, dust and other debris, prevent infiltration into the bearing cavity, maintain the normal operation of the bearing.
If the seal fails, it will cause external cooling water, emulsion, iron filings and other impurities to invade the bearing, resulting in lubricating oil pollution in the bearing chamber, aging and consumption and waste of a large number of oil, and even cause bearing damage, shutdown accidents, affecting production, and economic losses are very large.
Sealing principle
When the rolling mill is working, the oil throwing ring rotates synchronously with the main shaft at high speed, and produces relative rotating motion with the two sealing lips. The sealing effect comes from two aspects: First, the contact stress of the sealing lip, the sealing lip and the oil throwing ring are compressed in the axial direction, the lip shrinks inward to form the interference amount, and the lip edge produces compressive stress to play a sealing role. Second, the oil swinging effect of the lip on the oil side of the seal will be thrown out of the oil on the lip edge at a high speed, making it return to the headstock to avoid a large amount of accumulation on the lip of the seal. Similarly, the water dumping effect of the lip on the water sealing side makes the water gather into the drainage system and discharge to the outside.