20MG40.11.14 Resolving Leaks in the Loading Hydraulic Cylinder of Coal Mills

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Loading hydraulic cylinder leakage is a critical issue for ZGM medium-speed mills. Left unchecked, it destabilizes grinding force, leading to coarser pulverized coal and potential unscheduled shutdowns.

When addressing these issues, we follow the DL/T 466-2017 guidelines to ensure seal reliability and long-term stability in power station pulverizing systems.

I. Common Causes of Hydraulic Cylinder Leakage

Leaks typically stem from four primary failure points:

Seal Component Failure: Aging or deformation of O-rings and Y-rings due to high-temp/high-pressure exposure.
Mechanical Damage: Scratches or nicks on the piston rod or cylinder barrel wall preventing an effective seal.
Loose Connections: Vibrations causing seepage at high-pressure oil line fittings or aged gaskets.
Accumulator Abnormalities: Ruptured bladders or low nitrogen pressure (pre-charge) causing fatigue-inducing pressure spikes.

II. Systematic Troubleshooting and Repair Procedure

Depressurization & Inspection: Safely shut down and identify if the leak is at the rod end, joint face, or connectors.
Cleaning & Fastening: Tighten pipe threads and replace aged gaskets at the joint surfaces.
Internal Diagnosis: Disassemble the cylinder to check the surface finish of the barrel. Minor scratches can be honed; severe scoring requires replacement.
Auxiliary Check: Verify the accumulator nitrogen pressure is maintained at the design standard (approx. 4 MPa).

III. High-Efficiency Solution: The 20MG40.11.14 Cylinder

To permanently eliminate leaks, Dongfang SRI recommends the genuine 20MG40.11.14 Loading Hydraulic Cylinder. Designed specifically for ZGM123 series pulverizers, it features: