Conical Roller

Fast Speed & High Pressure

Explore our durable conical grinding roller for vertical roller mill, featuring tapered design for fast running speed and high grinding pressure.

Conical Grinding Roller Vertical Roller Mill Conical Rol Tapered VRM Grinding Roller Cement VRM Conical Roller +2 More

Download

Conical Roller

Fast Speed & High Pressure

Explore our durable conical grinding roller for vertical roller mill, featuring tapered design for fast running speed and high grinding pressure.

Download

The Conical Grinding Roller is a specialized wear part in vertical roller mills (VRM), designed with a tapered (conical) shape that works in tandem with a flat grinding table. This configuration excels in high-pressure, high-speed grinding of cement raw materials, clinker, coal powder, and slag, offering advantages in efficiency, compactness, and ease of upkeep compared to other roller forms.

Features & Benefits

Engineered for superior performance, our tapered VRM grinding roller provides distinct advantages over wheel-type or cylindrical designs:

Fast running speed and high grinding pressure for enhanced throughput
Compact, lightweight body reduces overall mill stress and energy use
Excellent wear resistance with hardfacing or high chromium materials
Convenient maintenance due to simpler handling and reversible segments

Gradual contact area distribution for uniform material extrusion and reduced uneven wear
Improved grinding efficiency (often 20-30% better in specific setups)
Compatibility with flat grinding tables (common in Loesche-style VRMs)
Long service life, minimizing downtime and replacement costs

These characteristics make the conical design particularly suitable for high-output cement operations seeking optimized energy consumption and reliability.

Technical Specifications

Parameter	Details
Design Type	Conical / Tapered (pairs with flat grinding table)
Material Options	High Chromium Cast Iron, Alloy Steel (e.g., 42CrMo base), Hardfaced Layers
Hardness (Hardfacing)	HRC 56-65
Wear Layer Thickness	15-20 mm typical (hardfaced variants)
Key Advantages	High pressure, fast speed, lightweight, easy maintenance
Compatibility	Customized for major VRM brands (e.g., Loesche, similar conical designs)
Condition	Brand New / OEM Quality

Conical Roller - Common Material Types

Conical Roller, are manufactured using different material compositions depending on the application, operating conditions, and performance requirements:

Composite Cast Structure

Often ceramic block inlaid roller sleeves, consisting of three layers: ductile iron (base), high-chromium cast iron (intermediate), and wear-resistant ceramic blocks (outer layer). This design balances high hardness with excellent toughness.

High-Hardness Cast Iron

Includes Ni-hard cast iron and high-chromium cast iron, achieving hardness above 58 HRC. Offers strong wear resistance but lower toughness, with potential for cracking under heavy impact.

Alloy Cast Steel

Such as ZG30Mn cast steel, optimized for improved hardness and wear resistance. Many undergo arc gouging finishing and non-destructive testing (ultrasonic, magnetic particle, dye penetrant) to ensure quality and extend service life.

Bimetal Centrifugal Casting

Outer layer uses alloy cast iron for high hardness and wear resistance, while the inner layer is gray cast iron for toughness and vibration absorption. The roller shaft is typically made of high-quality 45# carbon structural steel, assembled with interference fit for a strong, integrated structure.

Grinding Principle

Both vertical roller mills and roller presses operate based on the principle of material bed milling, ensuring efficient grinding through particle-to-particle interaction rather than direct metal contact.

Material Bed Milling Principle

During the grinding process, only a small portion of material particles directly contact the grinding components. Under applied pressure, the particles form a stable material bed. Through stress transmission and interaction between particles, the material is cracked, broken, and finely ground, resulting in high efficiency and reduced component wear.

Vertical Roller Mill Grinding Mechanism

In a vertical roller mill, the grinding components consist of rollers and a grinding disc. The grinding pressure is mainly generated by the rollers and is typically applied through a hydraulic loading system.

Material is fed onto the grinding disc from the center or side of the upper housing. As the disc rotates, a uniform material layer is formed. When the material passes between the rollers and the grinding disc, it is ground under combined extrusion and shear forces.

Roller Press Grinding Mechanism

A roller press uses two rollers of equal size as the grinding components. Material falls vertically from the top and forms a compact material bed between the rollers. Under the high extrusion force applied by the rollers, the material is compressed and ground into fine particles.

Roller presses are available in two drive configurations: double drive and single drive. The double drive roller press, where both rollers are independently driven, is the most commonly used design. In a single drive configuration, one roller is motor-driven, while the second roller is driven via a gear transmission.

Conical Roller

Design Structure

There are fundamental differences between the design structures of vertical roller mills and roller presses, which directly influence grinding efficiency, energy utilization, and product fineness.

Vertical Roller Mill: The material on the grinding disc is restricted by the air duct ring, while the material between the roller and the disc is not laterally confined. The mill typically uses two or more grinding rollers, creating a large contact area between the rollers and the grinding disc. Materials are ground repeatedly on the disc, resulting in higher energy utilization efficiency.
Roller Press: In addition to the restriction between the two rollers, side baffles are installed at both ends of the rollers, fully confining the material bed. This all-around restriction allows increased applied energy to significantly raise fine powder content and specific surface area, making the roller press superior in terms of material fineness growth.
Grinding Characteristics: The roller press features a small contact area between rollers and material, but achieves a large grinding ratio, allowing materials to be ground effectively in a single pass. In contrast, vertical mills rely on repeated grinding cycles, offering more stable operation and higher overall energy efficiency.
Performance Comparison: From the perspective of fineness increase and specific surface area, the roller press shows clear advantages. From the standpoint of energy utilization and repeated grinding, the vertical roller mill demonstrates superior performance.