20MG40.11.09.01J Medium-Speed Roller Coal Mill Roller Breather

The Roller Breather 20MG40.11.09.01J is a core auxiliary component of the roller assembly in ZGM medium-speed roller coal mills. Specifically designed for the entire ZGM series, it is typically installed at the shaft end of the roller bracket. It serves as a critical spare part for maintaining a stable environment within the roller’s internal oil chamber and extending the service life of the roller assembly.

As a high-priority component during power plant and coal mill maintenance, its primary function is to connect the roller sealing air with the internal oil chamber. It eliminates adverse effects caused by fluctuating temperatures and pressures, balances oil chamber air pressure, and achieves simultaneous oil-gas separation and dust blockage. This ensures a clean, stable operating environment for the roller bearings, strictly adhering to the maintenance standards for ZGM roller assemblies.

Operating Parameters & Environment

• Media: 1. External ambient air containing coal dust and moisture.

  2. Oil-gas mixtures generated by the evaporation of internal lubricating oil.

• Temperature Range: * Continuous operating temperature: -20°C to +120°C.

  • Instantaneous peak temperature: 150°C.

• System Integration: Works in synergy with radial oil seals, sealing rings, and roller brackets to form a comprehensive sealing and protection system.

Technical Features and Advantages

1. Robust Environmental Adaptability

Optimized for the harsh conditions inside a coal mill, this breather withstands extreme thermal cycling without deformation or brittle fracture. Its design prevents functional failure due to corrosion or clogging from coal dust and oil vapors, far exceeding the reliability of standard commercial breathers.

2. High-Efficiency Oil-Gas Separation

The internal high-precision separation structure quickly recovers evaporated lubricant back into the oil chamber while exhausting clean air. This prevents:

• Environmental pollution and lubricant waste.

• Excessive pressure buildup that could damage the 38042020 Radial Oil Seal or the 20MG50.11.09.92J Sealing Ring.

3. Stringent Dust and Moisture Blockage

Equipped with a specialized filtration layer, it prevents coal dust and water vapor from infiltrating the oil chamber. This protects the bearings from abrasive wear and prevents lubricant degradation. When used with the 20MG40.11.09.03 Protective Cover, it creates a multi-layered defense system.

4. Compact Design for Rapid Maintenance

The breather features a compact, lightweight structure tailored for the installation space of the 20MG40.11.09.98 Roller Bracket. It allows for direct docking with the bracket and the 20MG50.11.09.84J Shaft Sleeve without modification, significantly reducing downtime during scheduled overhauls.

5. Superior Material Longevity

Manufactured from high-grade corrosion-resistant alloys with specialized surface treatments, it resists rust and aging. Under normal conditions, it offers a service life of 8,000 to 12,000 hours, providing excellent cost-performance (ROI) by reducing replacement frequency.

ZGM Coal Mill Accessory Synergy Table

Typical Applications

The 20MG40.11.09.01J Breather is essential for the installation, maintenance, and overhaul of ZGM medium-speed roller mills. It is widely used in:

• Thermal Power Plants: Coal pulverizing systems.

• Metallurgy & Building Materials: Industrial grinding processes utilizing ZGM series mills.

HKZX-2026-02-26