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Operation And Maintenance Manual Of Vertical Roller Mill

Operation And Maintenance Manual Of Vertical Roller Mill

How To Reduce The Wear Of Vertical Roller Mills

Vertical Roller Mills are widely used in cement, electric power, metallurgy, chemical, non-metallic minerals and other industries to grind bulk, granular and powdered raw materials into the required powdery materials. With the continuous maturity and development of Vertical Roller Mill technology, many manufacturers use Vertical Roller Mills for grinding cement in addition to grinding raw materials, coal powder and slag powder. This article mainly discusses the causes and avoidance measures of the wear of the grinding roller and the grinding disc of the Vertical Roller Mill.

1. The Easy-Grindability Of Materials And The Selection Of Grinding Rolls And Grinding Discs

Grinding rolls and grinding discs are parts that are in direct contact with the material. If the material is poorly grindable, such as silica or shale, the lining of the grinding rolls and grinding discs will be seriously worn and uneven grooves and cracks will be caused. And broken edges. Choosing easy-to-grind raw materials can objectively prevent excessive wear of the grinding rolls and grinding discs. Then, choosing a good quality grinding roller and grinding disc can prolong the service life from subjectively, so as to reduce the production cost.

2. Is The Balance Between The Grinding Rolls And The Limit Height Consistent?

The balance between the grinding rolls means that the four grinding rolls are statically placed on the grinding disc, and the center lines of the four grinding rolls are above the same horizontal line, which has a direct relationship with the installation flatness of the grinding disc, and the processing of the grinding disc. The accuracy is also relevant. If it is unbalanced, the grinding wheel and the grinding roller in the Vertical Roller Mill operation will wear out quickly when the grinding roller is pressed and pressed.

The height of the limit is precisely used to control the thickness of the material layer. When the height of the limit of our school is inconsistent, the thickness of the upper layer of the grinding disc is also inconsistent, which will cause certain vibration during the operation of the Vertical Roller Mill. The increase in vibration is one of the main causes of wear. The height of the limit is inconsistent, and the grinding roller closest to the grinding disc is the most stressed during the pressure grinding process, so the wear is also the fastest.

3. Is The Grinding Tension Too Large And The Material Layer Too Thin?

In the operation, we have to get used to the process of increasing production pressure and reducing production and decompression. Especially in the process of reducing production, many operators have difficulty in reducing the tension of the surplus for the stability of control and the operation. Or in the process of production control, the tension of the Vertical Roller Mill is always kept a little marginal. In fact, this kind of practice can achieve the purpose of controlling and saving things to a certain extent, but after a while, you will find that the upper layer of the grinding disc is continuously thinning, and the vibration of the Vertical Roller Mill gradually increases, because The grinding pressure is greater than the feed amount. Thin material layer, large vibration and high tension pressure are undoubtedly important factors for the excessive wear of the grinding roller and the grinding disc.

4, To Prevent The Inside Of The Vertical Roller Mill Into The Metal Foreign Body

The most effective way to effectively prevent the metal inside of the Vertical Roller Mill from entering the metal is to use every iron remover in the system. The general raw material grinding system is equipped with two iron removers: one is above the belt conveyor integrated into the Vertical Roller Mill after the raw material is mixed, and functions to remove the metal foreign matter brought in the raw materials; one should be upgraded in the outer circulation Above the belt conveyor after the machine feed point or above the outer belt conveyor of the Vertical Roller Mill, it acts to remove the metal falling from the inside of the Vertical Roller Mill, such as the Vertical Roller Mill scraper plate, large bolt Wait.

Large or hard metal enters the Vertical Roller Mill, causing the Vertical Roller Mill to vibrate violently, causing the Vertical Roller Mill to stop and damage the reducer. It is more likely that the metal foreign matter will be crushed by the grinding roller, causing the roller roll skin to appear large. The phenomenon of shedding, the appearance of this situation is more terrible for the grinding roller and the grinding disc than the excessive wear. Therefore, minimizing the possibility of using metal remover to move metal foreign matter into the Vertical Roller Mill is essential for protecting the Vertical Roller Mill.

5. Use And Balance Of Nitrogen Pressure

The nitrogen pressure must be given according to the actual grinding pressure of 60% to 70%. The most important role of the nitrogen balloon is energy storage damping. Therefore, when using nitrogen pressure and grinding pressure, the above proportional relationship must be followed. The high grinding pressure and low nitrogen pressure will cause vibration; the nitrogen pressure is high, the grinding pressure is low, and the grinding roller can not overcome the rebound of nitrogen gas to generate vibration. Reasonable use of nitrogen pressure and grinding pressure can effectively restrain this vibration and effectively prevent the wear of the grinding roller and the grinding disc. At the same time, the nitrogen pressure between the nitrogen balloons must be the same, because the applied grinding pressure is the same. If the pressure between the various nitrogen balloons is different, the dynamic effect produced between the individual grinding rolls is different, and breaking the balance produces vibration. The chance of vibration wear increases.

6, To Prevent The Wear Of The Grinding Roller And The Grinding Disc Caused By Plastic Deformation Caused By Wear

All operating systems and equipment require reasonable rest, otherwise fatigue will occur, resulting in overload operation and equipment accidents. No matter which production line, the configuration of the Vertical Roller Mill has a certain surplus, so we must adjust the storage position during the organization of production, regularly check the Vertical Roller Mill system, leaving a certain time for the Vertical Roller Mill rests. According to the original, combustion material moisture in the condition of the grinding material temperature and drying ability can meet the requirements, as far as possible to reduce the grinding temperature, because the higher the metal temperature, the greater the probability of plastic deformation. Then a grinding roller that is running with great tension produces plastic deformation and its wear is also very blocky. Because the wear of the grinding roller also increases the wear of the grinding disc.

In fact, the wear of the grinding roller and the grinding disc is objectively an intangible consumption, which is invisible in the usual operation, so it is easy for everyone to forget the existence of this consumption. To prevent the grinding roller and the grinding disc from being worn too fast, it is necessary to pay attention to details in the production and timely maintenance.

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