Advantages and disadvantages of vertical roller mill

Vertical grinding mill equipment production line

Vertical roller mill is a drying and grinding equipment widely used in various industrial fields. Its uses include grinding cement raw materials or cement clinker, construction, chemicals, ceramics, and other industrial raw materials. The working principle of the roller mill is mainly to grind materials using the material bed grinding principle. It has the characteristics of low energy consumption and high grinding efficiency.

The mechanical structure of the roller mill is mainly composed of grinding rails, grinding bodies, force generation, and transmission mechanisms, air flow, and devices that facilitate the replacement of easy-to-replace parts. According to different working principles, roller mills can be divided into various types, such as three-roll mills, high-pressure roller mills, high-pressure suspension roller mills, etc.

When the roller mill grinds materials, the grinding effect is achieved through mutual extrusion of the grinding bodies and friction at different speeds. In the high-pressure roller mill, after the material is crushed in the feed bin, it enters the crushing cavity of the high-pressure roller mill through the feeder. Under the dual action of high-pressure spring and centrifugal force, the material is forced into the continuously compressed space and is crushed. Compaction, when a certain pressure is reached, is crushed or micro-cracks are formed inside the particles.

During the operation of the roller mill, the materials are brought into the grinding area driven by the rotation of the grinding disc. The bulk materials are directly crushed, and the fine-grained materials are extruded to form a bed for intergranular crushing. The material is in the middle of the particle bed, and one particle rubs against another particle, causing the edges and corners to fall off and be crushed. The crushed fine powder mass is immediately exposed to the high-speed airflow passing through the outside of the disc, which breaks and disperses the dense fine powder. The well is brought into the classifier or turned back according to the size, minimizing the buffering effect of the ultra-fine powder.

Why choose Baichy Machinery as your vertical roller mill manufacturer

In China, Baichy Heavy Industry has been the industry leader in crushers and crushers. All our machines and equipment feature high quality, stable operation, and rugged design.

Our products are diversified, and customized to design, manufacture, or process for different application areas. The Baichy roller mill is a perfect example of the versatility our engineers build into all of our machines. Durable and suitable for a variety of uses from limestone and clay to gypsum and coal, Baichy's industrial roller mills are very popular in the market.

What is a vertical roller mill Used For?

Centrifugal roller mills use the centrifugal force of cylindrical grinding rolls to crush material into a uniform particle size and grind, turning materials into small granules or fine powder. Some of its typical applications include the particle size reduction of coal, glass, gypsum, limestone, and more.

Simultaneous Grinding and Drying

vertical roller mill can perform simultaneous grinding and drying functions with one continuous operation. The roller mills' simultaneous grinding and drying features are typically for materials with higher moisture such as limestone and clay. Learn more about the Baichy machines capable of simultaneous grinding and drying functions.

Features of the vertical roller mill

1. Low energy consumption and high grinding efficiency.
The roller mill uses the material bed grinding principle to grind materials, and the system energy consumption is 20% to 30% lower than that of the ball mill.

2. Small footprint and lightweight.
There is a powder selection device in the roller mill, so there is no need for a powder selector and elevator. The dust-containing gas from the grinding can directly enter the dust collector for collection. Therefore, the process is simple, the layout is compact, and the building area and building space are smaller than that of the ball mill system. More than 30%. Under the same production capacity, the mass of the roller mill in the roller mill system is lighter than the mass of the ball mill in the ball mill system.

3. Large drying capacity.
The roller mill uses hot gas to transport materials, and the air volume, speed and temperature entering the grinding mill are very important. The roller mill can dry and grind materials with moisture content up to 12% to 15%, so the raw material drying system can be omitted.

4. Consumable parts have a long service life.
Since the structure of the roller mill determines that there is no direct contact between metals during the operation of the roller mill, the metal wear is small, the operation rate is high, and the wearing parts have a long life.

5. The grinding particle size is large.
The grinding particle size of the tube mill is generally less than 30mm, while the grinding particle size of the roller mill is generally 80~120mm, and the large roller mill can reach 200mm, which is 3~4 times larger than the tube mill, which can greatly improve the crushing improve the crushing capacity of the machine and simplify the crushing process.

6. The noise is 10 decibels lower than that of the tube mill, and infrastructure investment can be saved by 30%. The roller mill also has the advantages of easy monitoring and control of product fineness and ingredients, and simple maintenance.

Working principle of Vertical roller mill

The working principle of an industrial roller mill is to compress, shear, and grind materials through two or more rollers rotating at high speed to achieve the purpose of grinding. The core component of a roller mill is the roller, which is usually made of materials such as cast iron, steel, or alloy steel. Its surface is usually coated with materials such as carbide or ceramics to improve wear performance and corrosion resistance. During the operation of the roller mill, the material is fed into the feed port of the roller mill. After being compressed, sheared, and ground by the rollers, it is ground into powder and discharged from the discharge port.

Key Components of the Baichy Vertical roller mill

Rocker arm:The rocker's arm is one of the core components of the vertical mill. Each set of rocker arms includes an upper rocker arm, a lower rocker arm, a central shaft, a bearing seat, and bearings. The upper part of the rocker's arm is mainly used to install the grinding roller, and the lower part is connected to the hydraulic device.
Grinding roller:The grinding roller is the core component of the vertical mill and is mainly used to crush and grind materials. It is installed on the rocker arm of the mill and is pressed tightly against the material in the grinding plate under the action of external force. As the grinding plate rotates, the material is crushed and crushed.
Grinding disc:The grinding disc is fixed on the output shaft of the reducer and is where the grinding roller grinds the material. The grinding disc is mainly composed of a resistance ring, a lining plate, and a base. Its design makes the grinding disc base bear uniform force, increases the bite angle between the grinding disc and rollers, and avoids erosion of the non-wear-resistant surface of the grinding disc.
Pressure device:The pressure device is a component that provides grinding pressure for the grinding roller. It consists of a high-pressure oil station, a hydraulic cylinder tie rod, an accumulator, etc. It can apply sufficient pressure to the grinding roller to crush the material.
Reducer:The reducer is the main component for transmitting power. The rotation speed of the grinding plate is the rotation speed of the output shaft of the reducer.
Electric motor:The electric motor is the main power source that drives the vertical mill to operate.
Separator:The separator is an important component that determines the thickness of the grinding product. It consists of an adjustable transmission device, a rotor, a guide blade, a shell, a coarse powder blanking cone, an air outlet, etc. It is An efficient and energy-saving powder selection device.

Feeders for Vertical Roller Mills

Baichy industrial roller mills are used for a wide range of applications and materials, which means that the proper feeder selection is essential for high capacity, trouble-free operation, and more efficient production.

You can customize your vertical roller mill depending on what material you need to be reduced. Learn more about the different types of feeders that can be furnished to fit Baichy roller mills. Or, contact the Baichy team today to discuss your specific customization requirements for one of our roller mills.

What is a vertical roller mill?