Bearings For Cement Industry

What is a roller press?

The roller press is a machine widely used in various industrial fields, especially the cement industry. It is also called extrusion mill, roller mill, and roller mill. It is a new type of energy-saving cement grinding equipment developed in the mid-1980s.

The main function of the roller press is to squeeze the material and then grind the material into powder. It can replace the pre-grinding system of a ball mill that has high energy consumption and low efficiency. In addition, it reduces steel consumption and working noise. This kind of machine is suitable for new factory construction and can also be used for the technical transformation of old factories, which can increase system output by 30-50%.

Among the materials extruded by the roller press, 0.08mm fine materials account for 20-35%, and materials smaller than 2mm account for 65-85%. Since the internal structure of the particles is filled with tiny cracks due to extrusion, the grindability is greatly improved.

The roller surface of the roller press adopts thermal surfacing welding, and the wear-resistant layer is easy to maintain. This design gives the machine a long service life and reduces maintenance costs.

In general, the roller press is an important industrial equipment that has the advantages of increasing output, reducing energy consumption, and improving the grindability of materials.

• What are the specific applications of roller presses in the cement industry?

• In the cement industry, roller presses have many applications. Here are some of the main ones:

• Grinding of cement raw meal: Cement raw meal is an important raw material in the cement production process. It needs to be ground to better integrate with other raw materials. The roller press can grind the cement raw materials into more even and fine particles, thereby improving the quality and output of cement.

• Grinding of cement clinker: the cement clinker is a material that has been sintered at high temperatures and needs to be ground to obtain the final product. The roller press can break the sintered large pieces of clinker into small particles and further grind them to the appropriate particle size and fineness, thereby improving the quality and output of cement.

• Grinding of industrial raw materials such as slag and slag: In addition to cement raw materials and clinker, roller presses can also be used for grinding other industrial raw materials. For example, waste materials such as slag and furnace slag can be ground by a roller press and become reusable industrial raw materials.

• Energy-saving renovation of cement production lines: In the energy-saving renovation of cement production lines, roller presses are also one of the commonly used equipment. By replacing the original ball mill and other equipment with a roller press, the cement production line can be made more efficient and energy-saving, increasing output and reducing energy consumption.

• Construction of new cement production lines: In new cement production lines, roller presses have been widely used in the grinding of cement clinker. Compared with traditional ball mills and other equipment, roller presses have higher efficiency, lower energy consumption, and better product quality.

• In general, roller presses are widely used in the cement industry. They can increase output, reduce energy consumption, and improve grindability. They are an important grinding equipment.

• Roller press bearings are special bearings that can operate normally under high pressure, high impact load, high temperature, and corrosive environment. These bearings are commonly used in roller press systems in cement, steel, power, and chemical industries as critical support and transmission components. This article will introduce in detail the characteristics, structure, materials, and selection methods of roller press bearings.

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• Characteristics of roller press bearings

• Roller press bearings are highly complex mechanical components that have the following characteristics:

• High-speed heavy load

• The roller press bearing has high speed and strong load-bearing capacity and can work stably under conditions of high speed, high pressure, and high impact load. These bearings require high precision in design and manufacturing to ensure smoothness and reliability during high-speed operation.

• Withstand impact loads

• Roller press bearings often need to withstand impact loads from various raw materials, semi-finished products, and finished products. Therefore, the bearings are required to have high stiffness and strength and be able to withstand impact loads.

• High-temperature resistance and corrosion resistance

• During the working process, roller press bearings are often exposed to high temperatures, corrosive gases, liquids, and solid materials. Therefore, these bearings must be resistant to high temperatures and corrosion to ensure their normal operation over a long period.

• Easy maintenance

• In order to facilitate maintenance and repair, the design of roller press bearings should take into account easy disassembly and repair. The structure of the bearing should be compact, and parts should be easy to replace, thereby reducing maintenance costs.

• Roller press bearing structure

• Common roller press bearings mainly include inner rings, outer rings, cages, and rolling elements. The inner ring matches the shaft and rotates with the shaft; the outer ring matches the body, and the cage evenly separates the rolling elements to reduce friction and wear between the rolling elements. The rolling elements mainly have spherical, cylindrical, and conical shapes and cooperate with the inner ring and outer ring to form a raceway.

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• Roller press bearing materials

• Commonly used roller press-bearing materials include high-quality low-carbon steel, medium-carbon steel, and high-carbon steel, such as GCr15, GCr15SiMn, and GCr4. In order to improve the hardness and fatigue resistance of bearings, heat treatments such as carburizing and quenching are generally required.

• Selection of roller press bearings

• When choosing the right roller press bearings, you need to consider the following factors:

• Working conditions 

• The working environment of the bearing needs to be considered, such as temperature, humidity, atmosphere, impact load, and vibration. These conditions will affect the service life and reliability of the bearing, so the selection needs to be based on the actual situation.

• Bearing dimensions

• The size and structure type of the bearing need to be considered. Different sizes and types of bearings have different load-bearing capacities and service lives. It is necessary to select the appropriate bearing size and type according to actual needs.

• Accuracy level

• The accuracy level of the bearing needs to be considered. The higher the accuracy level, the better the smoothness and reliability of the bearing operation, but the higher the manufacturing cost. The appropriate accuracy level needs to be selected based on actual needs.

• Usage performance

• The performance and maintenance costs of the bearing need to be considered, including lubrication performance, anti-wear performance, anti-fatigue performance service life, etc. It is necessary to select suitable bearing materials and heat treatment methods according to actual needs to ensure the best balance between bearing performance and maintenance costs.

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• In short, roller press bearings are an important part of the roller press system, and their selection and use directly affect the performance and service life of the entire system. Therefore, in actual applications, it is necessary to select the appropriate bearing type and material according to the specific situation and install and maintain it in strict accordance with the usage requirements to ensure the stability and reliability of the entire system.