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Mechanical floating seals Description
Mechanical floating seals are mainly used to seal between parts that are moving relatively, and the following is a detailed description:
How mechanical floating seals work
The core of a mechanical floating seal is its floatability, i.e. the seal can float freely on the shaft to accommodate small deviations and vibrations of the shaft. It generally consists of two metal sealing rings and two rubber rings. This design allows the seal to operate without touching the shaft, reducing wear and heat generation. A seal typically consists of one or more annular elements designed to self-adjust their position under the action of fluid pressure, maintaining sealed contact with the shaft.
| Specification | Pressure | Temperature | Linear speed | Axial movement |
| 6~80mm | ≤1.0Mpa | -20℃-180℃ | ≤15m/s | ±1.0mm |
| Sealing face | Graphite, Silicon carbide, Tungsten carbide, Aluminumoxide, Stainless steel |
| Secondary sealing | Acrylonitrile rubber, Fluorine rubber, Ethylene propylene rubber, PTFE |
| Metal component | Stainless steel |
Application scenarios
Construction machinery field
In the traveling mechanism of heavy construction machinery such as bulldozers and excavators, floating seals are widely used in components such as drive wheels, guide wheels, and rollers. For example, in the crawler running gear of an excavator, the rollers bear most of the weight of the machine and are constantly rotating under the drive of the tracks. Floating seals can prevent lubricating oil from leaking from the inside of the roller, and at the same time prevent impurities such as soil, sand, and water from the outside from entering the wheel, protect the internal bearings and other components, and extend the service life of the equipment.
Mining machinery industry
For the axle of mining dump trucks, floating seals are a crucial sealing component. Mining dump trucks typically work in harsh road conditions, and the axles need to transmit huge amounts of torque to drive the wheels. The floating seal can effectively prevent the leakage of lubricating oil in the axle housing, ensure that the gears, bearings, and other parts inside the axle are well lubricated, and reduce the probability of wear and failure.
Agricultural machinery
Floating seals are also used in rear axles and final drives such as tractors. When the tractor is working in the field, it will come into contact with various pollutants such as mud, dust, and water. Floating seals ensure that the lubricating oil in the rear axle is clean, ensure the normal operation of the transmission system, and improve the efficiency and reliability of agricultural machinery.
Design features
Adaptability: Floating seals can automatically adjust to shaft drift and vibration, which reduces the risk of seal failure due to uneven movement of shafts.
Low wear: Since the seals do not directly contact the shaft, the wear rate is greatly reduced, extending the life of the seals.
High reliability: The design of the floating seals reduces the potential for leakage and increases the reliability of the entire system.
High temperature and high-pressure resistance: Many floating seals are designed to withstand high temperature and high-pressure environments, making them suitable for extreme operating conditions.
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