What is the grinding ring of a Raymond mill?

• Publication time：2025-06-20
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Raymond mill is widely used in the field of industrial powder making. As the core grinding component, the grinding ring cooperates with the grinding roller to complete the material grinding, improving the working efficiency of the equipment and the quality of the finished product.

Functions of the grinding ring of Raymond mill

Grinding Responsibility: The grinding ring is fixed inside the main machine, and the grinding roller rolls against its inner wall under the action of centrifugal force. After the material enters, it is crushed by rolling between the two. The efficient cooperation between the grinding ring and the grinding roller is the key to the smooth progress of the grinding process.

Wear-resistant and Compression-resistant: The grinding ring has to withstand the friction and impact of the material during operation. Usually, materials such as high-hardness alloys or wear-resistant cast iron are selected for manufacturing. High-hardness alloys have high hardness and strength, and wear-resistant cast iron has good wear resistance and impact resistance, which can ensure the service life and working stability of the grinding ring.

The structure of the Raymond mill grinding ring

Shape Design: Common grinding ring shapes include annular and bowl-shaped. The pendulum Raymond mill commonly uses a bowl-shaped design to provide a stable rolling track for the grinding roller. The sawteeth or grooves on the inner wall of the grinding ring can increase friction and the contact area, enabling the material to be evenly crushed and improving the grinding efficiency.

Hierarchical Structure: The grinding rings of some advanced Raymond mills adopt a multi-layer structure. Different layers can share the wear, extending the overall lifespan. When a certain layer is severely worn, only that layer needs to be replaced, reducing maintenance costs and downtime.

Diverse Materials: There are various choices of wear-resistant materials for grinding rings. High manganese steel (ZGMn13) rapidly hardens on the surface when impacted, making it suitable for ore crushing and limestone crushing in the cement industry. Alloy steel (such as Cr15, Cr20) achieves a balance between hardness and toughness after heat treatment and is used for the conventional grinding of cement limestone, which can reduce wear and improve efficiency. Nickel-hard cast iron, due to its nickel-alloyed structure, has excellent wear resistance strength and lifespan in high-wear powder grinding operations in the mining industry. Although the initial cost is high, the cost-effectiveness over the entire life cycle is remarkable. These three types of materials each have their characteristics, and precise selection can be made according to impact strength, wear type, and cost budget.

Maintenance key points of the Raymond mill grinding ring

Precise model matching: The size differences of Raymond mill grinding rings among different models are significant. Mismatching can affect installation and performance. When replacing, it is necessary to refer to the instruction manual to ensure size matching.

Installation accuracy: Ensure that the gap between the grinding ring and the grinding roller is uniform (1 - 3mm). Use professional tools and techniques to avoid uneven wear that may cause equipment failures.

Synchronous replacement: Replace the grinding rollers synchronously to ensure balanced grinding effects, improve production efficiency and product quality, and reduce maintenance costs.

Wear signs: Decreased production, coarser finished product particle size, and increased equipment vibration are important signals of grinding ring wear. It is necessary to detect them in a timely manner to avoid equipment failures and production losses.

Maintenance rules: Regularly check the thickness of the grinding ring. Consider replacing it when the unilateral wear exceeds 5mm. Avoid metal foreign objects entering the grinding area. A magnetic separator can be installed and material inspection can be strengthened. Match the material of the grinding ring according to the hardness of the material to extend the service life of the grinding ring.

Summary

Although the grinding ring is small, its role is significant. It is the key to the efficient and stable operation of the Raymond mill. During operation, it will wear out, and it is necessary to master the maintenance and replacement methods.