Application of ultra-high molecular weight polyethylene materials in belt conveyors

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A belt conveyor is a commonly used conveying device in engineering. It features a simple structure, low cost, and easy maintenance, and can meet the requirements for transporting materials over different distances. In belt conveyors, idler rollers serve to support the conveyor belt and the load, reducing the weight of the belt as well as its swaying during operation, thereby ensuring that the belt moves smoothly in the intended direction. A conveyor contains a large number of idler rollers. As one of the important components of a conveyor, the cost of these idler rollers accounts for about 25% of the total cost of the conveyor. The quality of their manufacturing and installation directly affects the lifespan and operating resistance of the conveyor belt. The costs associated with the maintenance and replacement of idler rollers are also an important part of the operating expenses of belt conveyors. Therefore, analyzing and studying ways to extend the service life of idlers, as well as designing and using them properly, are important tasks for ensuring the stable operation of belt conveyors, and they hold significant practical importance in engineering. Ultra-high molecular weight polyethylene is internationally known as UHMW-PE material; its molecular weight ranges from about 1 to 7 million g/mol. It is a new type of wear-resistant material that fills the gap in terms of wear-resistant materials available today. From a molecular structure perspective, as the molecular weight of polyethylene increases, the length of its polymer chains also increases. Through polymerization, ethylene monomers undergo a continuous bonding process to form long chain-like polymer structures that are difficult to break, which results in an improvement in the material’s wear resistance and an extension of its lifespan on a macroscopic level. This material has the following main advantages: (1) light weight, wear resistance, and long service life ； (2) The surface is smooth, with a low coefficient of friction, and it does not stick easily to objects ； (3) Basically does not absorb moisture ； (4) Strong corrosion resistance, resistant to acids and alkalis, and does not age easily ； (5) It possesses high impact strength; it is a polymer with extremely high toughness, and its impact strength increases as the molecular weight increases. Due to the aforementioned properties of ultra-high molecular weight polyethylene materials, their use in belt conveyors can be considered to improve the safe operation of such conveyors. Idler rollers are important components in belt conveyors; they perform various functions within such systems. Their main roles include supporting the conveyor belt, increasing the amount of goods that can be transported, cushioning the impact of goods on the belt, and correcting any misalignment of the conveyor belt. If the idler rollers are damaged, it can lead to belt deviation at the least, affecting the service life of the conveyor as well as the amount of material that can be transported ； In severe cases, it can lead to material scattering or even machine shutdowns, directly affecting production. Therefore, the quality of idler rollers has a significant impact on both the service life of the conveyor and its safe operation. Due to the aforementioned advantages of ultra-high molecular weight polyethylene materials, along with their ease of processing and low cost, they can be considered for use in manufacturing idler rollers, which can effectively extend the service life of belt conveyors and reduce failure rates. Under special operating conditions, due to the harsh working environment of the conveying equipment, the idlers of belt conveyors experience significant wear during operation; these idlers are generally made of seamless steel tubes. When roller bearings are made from ultra-high molecular weight polyethylene materials, a centripetal ball bearing support and a labyrinth seal structure with plastic sealing rings can be employed. This approach provides good dust prevention, low resistance, easy installation and removal, and facilitates maintenance, thereby effectively reducing the operating costs of the conveyor. Ultra-high molecular weight polyethylene materials are suitable for use in belt conveyors. They have no special requirements regarding the working environment, are easy to install, and are inexpensive; thus they represent an ideal alternative to wear-resistant materials in practical engineering applications. It is also possible to consider using this material in other relevant engineering transportation systems; ultra-high molecular weight polyethylene materials have extremely broad application prospects in practical engineering applications.