Roller mill stability and grinding roller system performance

by Gao Yangyang and Dr Wu Wenbin, Grain and Oil Machinery Research Institute, Henan University of Technology, China

The grinding roll system used within roller mills consists of grinding rolls, bearings, a bearing seat, inter-roll transmission mechanism and clutch rolling and distance adjustment mechanism (See Figure 1).

In the actual work operations of the mill, the vibration amplitude of the roll produced by the defect of the roll grinding system and the impact of the load is called the stability of the roll grinding system. The grinding roll exerts a grinding effect on material, primarily through friction and extrusion.
 

The smooth operation of the grinding roll system is the key to ensure the grinding effect of the mill is carried out efficiently and properly. The poor stability of the grinding roll system will produce a periodic load/pressure on the grinding roll, increasing the friction force between the two rolls and the material, generating excessive friction heat and increasing energy consumption, resulting in wear and tear on the roll surface and reducing the grinding effect.

The service life of grinding rolls and the vibration of grinding rolls causes changes within rolling distance, seriously affecting the crushing effects of material, changing the roughness of grinding materials, increasing the temperature of grinding materials and the instability of centrifugal grinding rolling distance will affect the pulverising rate of the grinder.

The low pulverising rate will aggravate the load of follow-up equipment, shorten the service life of equipment parts, reduce the output of the mill and make the pulverising rate too high. The quality of the grinding roll is reduced and the wear of the grinding roll is aggravated (See Figure 2).

The main factors affecting the stability of the grinding roll system are the manufacturing accuracy of the grinding roll, bearing accuracy, feed uniformity, assembly accuracy and clutch rolling mechanism. Other factors can also be at play here.

The theoretical analysis and experimental results show that the working stability of the roller system directly affects the output and fineness of the mill as well as the temperature of the mill, energy consumption, the range of the processed materials, the shape and distribution of the particles and the life of the components. At the same time, it will increase the vibration and noise of the mill and deteriorate the workshop environment.

Read more HERE.

 

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