MG40.11.02.97 Rigid Coupling Elastic Sleeve :The Core Cushioning Component

The Rigid Coupling Elastic Sleeve MG40.11.02.97 is the core cushioning component of the rigid coupling system in medium-speed coal mills. Its function is to absorb impact loads and vibration energy during the transmission process, thereby protecting the main body of the coupling and the driven equipment from mechanical damage. This elastic sleeve is widely used in medium-speed coal mill equipment in industries such as thermal power generation, cement and building materials, and metallurgy, making it one of the key components for ensuring stable operation of coal mills.

I. Structure Design and Material Characteristics

The MG40.11.02.97 elastic sleeve is manufactured from Polyurethane (PU) material, which offers superior elasticity and wear resistance.

Structure Design

Its structure is designed as a cylindrical sleeve. The inner diameter mates with the elastic pin of the coupling, and the outer diameter matches the elastic hole in the coupling half. Positional accuracy is achieved through an interference fit. This design not only ensures the freedom of axial expansion and contraction of the sleeve during operation but also effectively restricts radial displacement, guaranteeing consistent cushioning performance.

Advantages of Polyurethane Material

The characteristics of polyurethane material provide the following advantages:

• High Elastic Modulus: It can absorb a large amount of kinetic energy through its own deformation when subjected to impact loads, reducing vibration transmission to the coupling and the drive motor.

• Wear and Tear Resistance: Suitable for the high-speed scouring environment of pulverized coal particles inside the coal mill. Its service life is extended by 2 to 3 times compared to traditional rubber elastic sleeves.

• Oil and Temperature Resistance: It can operate stably in a temperature range of -20~80, resisting erosion from coal mill lubricants and pulverized coal media, preventing premature aging and embrittlement.

II. Working Principle and Application Value

In the rigid coupling system of a medium-speed coal mill, the primary function of the elastic sleeve MG40.11.02.97 is cushioning and shock absorption:

When the coal mill generates an impact load due to issues like coal block jamming or sudden load changes, the elastic sleeve absorbs a portion of the energy through its elastic deformation. This prevents the coupling pins from breaking due to overload and simultaneously reduces vibrational wear on components such as motor bearings and gearboxes. This characteristic directly enhances the operational stability of the coal mill, lowering equipment failure rates and maintenance costs.

Key Application Scenarios (Concentrated in ZGM-type medium-speed coal mills):

• Thermal Power Plants: Used in the couplings of coal mills within the boiler pulverizing systems to ensure the continuity of coal powder preparation.

• Cement and Building Materials Industry: Applied in raw material mills and coal mills, ensuring smooth operation during the raw material crushing process.

• Metallurgy Industry: Used in coal mills for blast furnace pulverized coal injection systems, resisting the scouring and impact of high-temperature pulverized coal.

III. Installation and Maintenance Essentials

To ensure the elastic sleeve MG40.11.02.97 achieves its best performance, the following operational guidelines must be followed:

• Pre-installation Check: Confirm that the sleeve dimensions match the coupling's elastic hole and that the surface is free of defects such as cracks or deformation.

• Installation Method: Use a dedicated tool to press the elastic sleeve into the coupling's elastic hole, avoiding hammering which can cause damage.

• Regular Inspection: Check the sleeve's wear level quarterly. If the outer diameter reduction exceeds 10% or if grooves or cracks appear on the surface, immediate replacement is required.

• Environmental Control: Prevent the elastic sleeve from coming into contact with sharp foreign objects or high-temperature flames to avoid mechanical damage and thermal aging.

We can supply the following accessories for medium speed coal mills：

HKZX-2025-11-07