vertical roller mill97

Description: Frequently asked questions about vertical roller mills
Group News
05/05/2019  

Roller body wear
During the use of the vertical grinding roller body and the wear-resistant lining plate, due to the roller rolling pressure, the material supporting force, the frictional resistance between the material and the grinding roller lining; the grinding roller shearing due to the material grinding angle The combined effects of stress, the pressure of the hydraulic system of the roller mill and the apparent compressive stress of the vertical roller mill are applied to the effective rolling zone of the vertical grinding roller. Once the matching clearance occurs, impact collision will occur between the body and the lining, which will increase the wear between the body and the lining. In severe cases, the lining will crack or even break, causing the lining to fall off and the machine is damaged, especially the reducer. Damage, causing a vicious incident. Once such problems occur, the general repair methods are difficult to solve. Disassembly, welding repair, and machining are time-consuming and labor-intensive, resulting in a significant delay in downtime, which brings irreparable huge economic losses to the enterprise. In response to the above problems, developed countries such as Europe and the United States often use polymer composite materials for rapid repair of vertical grinding roller wear, among which the Fushun Blue series is relatively mature. The material is satisfactorily solved with its excellent mechanical properties and good plasticity. It not only prolongs the service life of the equipment, improves the productivity, but also avoids the secondary possibility of the problem, and avoids the additional downtime of the shutdown, and escorts the safe and continuous production of the enterprise.
Vertical mill wear chamber wear
The assembly requirements of vertical grinding roller bearings are relatively strict, and enterprises generally use the method of cooling the bearings in dry ice. Once there is a gap between the bearing and the bearing chamber, it will affect the normal operation of the bearing, causing the bearing to heat up, which will lead to bearing sintering. Traditional soldering brush plating methods have certain drawbacks: repair welding will cause thermal stress to damage the bearing material, and will deform or even break when severe; brush plating pollution is heavy, and the thickness of the coating is limited, the application is greatly limited. The polymer composite material not only has the strength and hardness required by the metal, but also has the concession (variable relationship) that the metal does not have. Through the processes of “mold repair”, “component correspondence”, “machining”, etc., the maximum can be maximized. Ensure the size of the repaired parts and the matching parts. At the same time, the composite material itself has the comprehensive advantages of compression resistance, bending resistance and elongation, which can effectively absorb the impact of external forces and greatly resolve and offset the radial direction of the bearing. The impact force avoids the possibility of gaps and avoids secondary wear caused by the increase of the gap.
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