The roller shell of the pelletizing machine is the core component responsible for compressing powdered or granular materials into pellets or lumps. Its material and performance directly influence the equipment's service life and production efficiency, making it widely used in industries such as metallurgy, energy, and chemical engineering.
Roller Cover Classification for Ball Press Machine
1. Classified by material:
- 65Mn material: Lower cost, suitable for small coal powder balling machines.
- 9Cr2Mo material: Offers excellent wear resistance, making it suitable for medium- to large-scale briquetting machines.
- High-chromium alloy material: highly wear-resistant, ideal for medium- to large-scale pelletizing machines with high production volumes.
- Bearing steel material: Specifically designed for ball presses used in hard materials like fluorite powder, extending service life by more than 30%.
2. Classified by assembly method:
- Integrated design: The roller cover and core are manufactured as a single unit, ensuring a robust and stable structure.
- Modular design: The roller cover is replaceable for easy maintenance.
3. Classified by Pressure:
- High-pressure roller: Suitable for high-density materials such as metal ore powder, used in dry pressing (without binders), with relatively high pressure ranging from 9 t/m³ to 20 t/m³.
- Medium-pressure press roller: Suitable for general materials such as coal powder and coke powder, used in wet pressing (with the aid of a binder). It operates at lower pressures, typically ranging from 3 t/m³ to 6 t/m³.
Important Features
- Wear-resistant protection: Shields the roller core from wear, extending the equipment's lifespan.
- Forming function: Ensures uniform pellet shapes through die design.
- Adjusting pressure: Optimizing pressure distribution to enhance molding density.
Scope of Application
1. Coal Industry
- Briquette production: Used to compress coal powder into briquettes, enhancing combustion efficiency and reducing environmental pollution.
- Coal chemical industry: In processes such as coal-to-oil and coal-to-gas production, coal powder is pressed into shaped forms for easier transportation and processing.
2. Mining Sector
- Metal ore powder pelletizing: For instance, iron ore powder and copper ore powder are compressed into pelletized ore, making them easier to smelt and transport.
- Non-metallic mineral powder pelletizing: For instance, fluorite powder and gypsum powder—after being compressed into pellets, their added value and utilization efficiency are significantly enhanced.
3. Construction Materials Industry
- Refractory material balling: Materials such as high-alumina powder and clay powder are pressed into refractory brick blanks or refractory balls, which are used for kiln construction.
Process Introduction
1. Material Selection: Choose wear-resistant materials such as 65Mn, 9Cr2Mo, or high-chromium alloy based on the material properties.
2. Processing Flow:
- Blank production: Casting or forging, ensuring material density.
- Machining by lathe: Finish machining to within dimensional tolerance limits.
- Carving ball sockets: Design the shape and size of the sockets according to material properties.
- Heat treatment: Processes such as quenching and tempering to enhance hardness and wear resistance.
3. Quality Inspection: Verify hardness, dimensional accuracy, and surface roughness to ensure compliance with standards.
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Roller Cover for Ball Press Machine
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