20MG42.11.09.01 ZGM Medium-Speed Pulverizer Roller Breather

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In the operational protection system of the ZGM medium-speed pulverizer roller assembly, the breather serves as a critical pressure regulation and dust-proof sealing component. It directly influences the stability of the internal lubrication system and the service life of the roller components. As a specialized spare part, the Breather 20MG42.11.09.01 creates a reliable barrier for the shafting and seals by balancing internal pressure and filtering external contaminants.

I. Product Overview

The 20MG42.11.09.01 breather is designed specifically for ZGM series pulverizers. Typically installed on the top or side of the roller assembly, it works in synergy with the Oil Seal Bracket (20MG43.11.09.37) and Graphite Carbon Ring (299MG41.11.06.98).

Core Functions:

Pressure Balancing: Releases oil mist generated by high temperatures to prevent oil seal deformation.
Dust Filtration: Blocks external coal dust from entering the lubrication system.
Leakage Prevention: Prevents lubricant leakage while blocking external moisture and pollutants.

II. Technical Features and Advantages

The breather utilizes a modular design and high-grade materials to withstand the harsh environment of coal pulverization (high temperature, high dust, and oil mist).

Feature	Technical Detail	Operational Advantage
Modular Design	Separate pressure regulation, filtration, and sealing modules.	Facilitates easy disassembly, cleaning, and partial replacement (e.g., replacing only the filter), reducing maintenance costs.
High-Precision Filtration	High-density mesh with >95% filtration efficiency.	Effectively intercepts coal dust, reducing wear on the shaft and graphite carbon rings.
Premium Materials	Seals made of Nitrile Rubber (NBR) or Fluoroelastomer (FKM); Body made of high-strength alloy.	Excellent oil and heat resistance (-30°C to 150°C). Prevents aging, swelling, or corrosion in harsh environments.
Precise Compatibility	Strictly follows ZGM original design standards.	Seamless integration with Pull Rods (21MG40.11.13.99/96) and Compression Bolts (20MG43.11.08A) without interfering with roller movement.

III. Application Scenarios

The breather is an essential component during the assembly, routine maintenance, and overhaul of ZGM pulverizers in power plants and chemical enterprises.

1. Routine Maintenance (Every 1,000 Hours)

Inspection: Check for oil mist leakage, filter clogging, and seal aging.
Fastening: Verify the tightness of the compression bolts to prevent displacement.
Cleaning: If the filter is obstructed by coal dust, it must be cleaned or replaced immediately to restore airflow.

2. Overhaul & Disassembly (3,000–4,000 Hours)

System Check: If the pulverizer exhibits oil leakage or abnormal vibration, the breather must be fully inspected.
Replacement: Components with stuck pressure valves or corroded bodies must be replaced to protect the new Roller Tires (20MG42.11.09) and internal bearings.

3. Emergency Troubleshooting

Failure Mode: Clogged filters or failed pressure valves lead to internal overpressure, causing sudden oil leaks or accelerated wear.
Response: Immediate shutdown to replace the breather and contaminated lubricant, ensuring the "barrier" is restored before restarting.

IV. Selection and Maintenance Recommendations

For plant engineers and procurement specialists, the following criteria are vital:

Precision Matching: Ensure the model matches the specific ZGM variant to avoid interface conflicts with oil seal brackets.
Material Verification: Confirm that seals are FKM or NBR to ensure they do not degrade when exposed to hot lubricating oil.
Synergy in Procurement: It is recommended to source the breather alongside associated parts (pull rods, carbon rings, and seals) to ensure system-wide compatibility.

Maintenance Pro-Tips:

Cleanliness: Always clean the mounting interface before installation to prevent "built-in" contamination.
Torque Control: Use specialized tools to tighten bolts; over-tightening can deform the breather body.
Record Keeping: Maintain a log of filter cleanings and seal replacements to predict the next service interval based
on specific coal quality and operating temperatures.