Factors affecting the abrasion resistance of roller coating
Summary of factors affecting the rubber coating wear resistance of drum
The material selection and processing technology of roller coating have a prominent impact on its wear resistance. Under different work requirements, the types of roller coating are different. In addition, the precision of the roller coating process also has some impact on the quality and wear resistance of the coating. However, in practical application, the anti-wear ability of drum rubber coating is related to many factors [48-49]. Several of these factors are summarized as follows:
The quality of rubber is the key factor affecting the wear resistance of rubber coating. The higher the friction performance of the rubber used for rubber coating, the stronger its wear resistance. It can be seen that the service life of rubber coating depends on the performance parameters of rubber.
(2) Technology of coating glue
When the traditional hot vulcanization technology is adopted, the vulcanization pressure is low, the sulfur content is high and the rubber density is low, resulting in poor wear resistance; The cold vulcanization coating technology makes a big adhesive force between the coating and the drum, a fast vulcanization speed , a high rubber density , a strong wear resistance , a long service life , and a convenient on-site construction , high efficiency and low cost.
The strength of the adhesive force between the rubber coating and the drum plays a very important role. If the adhesive force is not enough, the long-term operation of the drum will cause the rubber coating to separate from the drum surface, resulting in the shutdown of the belt conveyor. Therefore, the strength of the selected adhesive is also an influencing factor.
(4) Surface structure of coated rubber
At present, the driving rollers widely used in belt conveyor include diamond or herringbone pattern rubber coating roller and rectangular pattern ceramic rubber coating roller. The convex hull structure shape, size and distribution of the rubber coated surface of the three rollers are different, and their wear resistance will also be different.
Performance comparison of selected materials for roller coating
Nowadays, most of the rubber coating materials selected by the widely used rubber coating rollers are ordinary rubber, polyurethane and ceramic materials. These materials have different wear resistance, and the rubber coating rollers have their own characteristics in use. Now we compare the performance of these three kinds of rubber coated rollers, which are summarized as follows:
(1) Ordinary rubber coated rubber has a good mechanical strength performance, large elastic holding force, good dust removal and clean water capacity and economical price. However, its quality is unstable and prone to degumming and deviation. When the rubber coated roller works in wet and muddy environment, the surface friction coefficient will decrease significantly.
(2) Polyurethane is a high molecular material with high mechanical properties such as strength and elasticity. It has excellent comprehensive mechanical properties such as wear resistance, high temperature resistance and vibration resistance. It can replace rubber and plastics and is widely used in all walks of life. According to the research, when the temperature does not exceed 60 ℃, the friction coefficient of polyurethane elastomer will increase with the increase of temperature to 51. These properties significantly enhance the wear resistance of polyurethane rubber coated roller, and its application range is wider than that of rubber coated roller.
(3) Ceramic drum pulley sheet can work in extremely harsh environments such as rainy days, easy to slip and high wear, and has super wear resistance and long service life. A layer of special wear-resistant ceramic rubber plate is attached to the drum, and then thousands of independent small ceramic pieces are pasted on the surface of the rubber plate. These protruding ceramic pieces can actively generate traction under the pressure of the conveyor belt, prevent slipping and prolong the service life of the belt. But there are also some disadvantages: ceramics are easy to be crushed due to brittleness, ceramic pieces are easy to fall off, the surface is hard to clean, and the technical cost is high.
