Technical Datasheet-Oil Seal Support Ring 20MG20.11.09.83J

The Oil Seal Support Ring 20MG20.11.09.83J is a specialized sealing and positioning component designed for the bearing housing and roller shaft systems of ZGM Medium-Speed Roller Coal Mills. Its primary function is to provide a high-precision mating surface for the oil seal, protecting the main shaft journal while preventing lubricant leakage and dust infiltration. It is a high-frequency replacement part during power plant and coal mill maintenance overhauls.

This component is compatible with the sealing structures of the entire ZGM series. Together with oil seals, carbon rings, and roller seal air pipes, it forms a complete sealing system. Manufactured from Q235A carbon structural steel in accordance with the GB/T 700-2019 material standard, it offers excellent ductility, weldability, and assembly adaptability.

Core Functional Roles

• High-Precision Interface: Provides a smooth, accurate mating surface for the oil seal lip.

• Sacrificial Protection: Absorbs friction and wear in place of the main shaft, protecting the high-value shaft journal.

• Precise Positioning: Enables accurate axial and radial alignment of the oil seal to ensure long-term sealing reliability.

Technical Features and Advantages

1. Standardized Material & Stable Processing

Utilizing Q235A steel ensures moderate carbon content and superior formability. The ring undergoes precision turning and finishing processes to ensure dimensional consistency, meeting the rigorous demands of bulk replacement during power plant maintenance.

2. High-Precision Working Surface

The inner bore surface in contact with the oil seal is precision-ground to a surface roughness of Ra 0.4–0.8 μm. This low-friction, high-gloss finish significantly reduces wear on the oil seal lip, extending the seal's service life to 8,000–20,000 hours, fully complying with ZGM maintenance standards.

3. Reduced Maintenance Costs

As a replaceable wear part, the 20MG20.11.09.83J support ring is designed to be the primary friction point. By preventing direct wear on the main shaft journal, it eliminates the need for expensive shaft repairs or replacements, offering a highly cost-effective protection solution.

4. Reliable Assembly & Alignment

The structural design ensures that the oil seal remains perfectly positioned within the bearing housing. This prevents common failure modes such as seal tilting, lip turnover, or seepage, working in tandem with the carbon rings and seal air pipes to enhance overall machine reliability.

ZGM Coal Mill Accessory Compatibility List

Application Scenarios

The Oil Seal Support Ring 20MG20.11.09.83J is primarily used for oil seal positioning and shaft protection in ZGM80, ZGM95, ZGM113, and ZGM123 models.

• Routine Inspection: Monthly checks for wear, scratches, or corrosion. If the surface roughness degrades or wear "steps" appear, immediate replacement is required to prevent oil seal failure.

• Quarterly/Bi-annual Maintenance: Cleaning of dust and carbon deposits; checking coaxiality and fit clearance. Aging oil seals should be replaced simultaneously to ensure a tight fit against the support ring.

• Annual Overhaul & Emergency Repair: During a major overhaul, the support ring must be replaced as part of the complete seal kit (including oil seals, carbon rings, and air pipes). In cases of oil leakage from the bearing housing or rising roller temperatures, this part should be prioritized for troubleshooting.

HKZX-2026-02-26