Technical Specifications: Elastic Sleeve 300MG41.11.02.96

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The Elastic Sleeve 300MG41.11.02.96 is a specialized power transmission spare part designed for the flexible pin coupling mechanisms of ZGM series medium-speed pulverizers, specifically the ZGM123G model. It provides critical damping and sealing for the connection points between the motor and the grinding mechanism, protecting the shafting and bearings from alternating loads and rigid impacts.

I. Product Overview

In the transmission system of a pulverizer, components must withstand high torque and vibration. The elastic sleeve acts as a buffer, ensuring that the connection remains flexible while maintaining a tight seal against lubricants and contaminants.

System Integration: Works in conjunction with the Elastomer Assembly (MG40.11.02.97) and Shaft Sleeve (20MG50.11.09.84J).
Material Science: Manufactured from a specialized oil-resistant rubber compound designed for industrial environments involving constant exposure to lubricating oils and coal dust.
Operating Range: Maintains structural integrity within a temperature spectrum of -20°C to 120°C, covering both cold-start and high-temperature operational phases.

II. Technical Features and Advantages

Feature	Technical Detail	Operational Advantage
Oil-Resistant Rubber	Specialized formula resistant to swelling, aging, and cracking when submerged in oil.	Prevents loss of cushioning performance and ensures long-term sealing reliability in oil-heavy environments.
Vibration Damping	High elastic recovery capability and precise fit for coupling pins.	Absorbs rigid impacts between the motor and mill, compensating for minor coaxiality deviations and reducing overall system vibration.
Thermal Stability	Operational range of -20°C to 120°C.	Prevents material embrittlement during shutdowns and softening during continuous high-load operations.
Structural Protection	Precise dimensions ensure tight fitting at connection points.	Blocks coal dust and impurities from entering the pin-hole interface, reducing wear on the Hinge Device (20MG50.11.11).

III. Application Scenarios

The Elastic Sleeve is a "wear part" whose condition is vital to the stability of the transmission system. Its maintenance is deeply integrated into the pulverizer’s lifecycle management.

1. Routine Maintenance (1,000-Hour Cycles)

Visual Inspection: Check for cracks, swelling, or loss of elasticity.
Performance Evaluation: Monitor the gap between the sleeve and the pin. If the gap exceeds design tolerances or sealing performance drops, the sleeve must be replaced.
Early-Stage Monitoring: During the first 100 hours of operation after a new installation, frequency of inspection should be increased to ensure the component adapts to the transmission load.

2. Overhaul and Component Replacement (3,000–4,000 Hours)

During a full system teardown or when abnormal vibration is detected, the 300MG41.11.02.96 sleeve should be comprehensively inspected.

Replacement Trigger: Any signs of aging or permanent deformation require immediate replacement.
Mandatory Update: It is recommended to replace the elastic sleeve whenever the Shaft Sleeve (20MG50.11.09.84J) or Hinge Device (20MG50.11.11) is serviced to ensure the entire assembly operates with uniform damping characteristics.

3. Special Operating Conditions

Vibration Control: If the Scraper Device (313MG31.11.07.01) is worn, causing increased mill vibration, the elastic sleeve absorbs the extra kinetic energy, protecting the bearings.
Load Changes: After replacing Liners (20MG53.11.08.98J), the transmission load profile changes; the elastic sleeve helps the system adapt to these new load characteristics by compensating for initial mechanical stresses.

IV. Maintenance Summary Table

Maintenance Type	Frequency/Trigger	Key Action	Associated Components
Minor Inspection	Every 1,000 Hours	Check for oil swelling/cracking	Pin Assembly
Major Overhaul	3,000–4,000 Hours	Full replacement of aged sleeves	Hinge Device, Shaft Sleeve
Abnormal Event	Excessive Vibration	Inspect for damping failure	Scraper Device, Liners