News and Information

26

2020-05

Classification of Conveyor Belt Splices

All conveyors must be connected in a closed loop before operation; therefore, the quality of conveyor belt splices directly affects belt durability and the smooth operation of the conveying process. There are three common methods for making conveyor belt splices: mechanical splicing, cold-bonding splicing, and hot-vulcanization splicing. Mechanical splicing generally refers to the use of splice plates to join conveyor belts. This method is convenient and cost-effective, but it has low splice efficiency, is prone to damage, and can shorten the service life of the belt. PVC and PVG flame-retardant and antistatic conveyor belts typically employ splices that fall within the lower eight grades of standard splicing methods. Cold-bonding splicing involves using a cold-bonding adhesive to join the belt. Compared with mechanically spliced joints made using vulcanizing rollers, this method is more efficient and economical and generally yields better splice performance; however, in practice, because the process conditions are difficult to control and the quality of the bonding compound has a significant impact, the splice quality can be less stable. Hot-vulcanization splicing has been proven in practice to be an ideal joining method, as it ensures high splice efficiency, stable performance, long service life, and ease of operation. Nevertheless, it suffers from drawbacks such as a complicated process, high costs, and lengthy connection times.

26

2020-05

Common Materials Used in Belt Conveyors

The commonly used material for belt conveyors is glass-fiber-reinforced polymer (GRP). GRP is short for glass-fiber-reinforced composite material. Composite materials are composed of two or more constituent materials with distinct chemical or physical properties. Composites are classified as particle-reinforced or fiber-reinforced. In the case of GRP, the matrix is a resin, and the reinforcement is glass fiber; GRP can be further divided into continuous-fiber and discontinuous-fiber types. Continuous-fiber GRP includes laminated structures, filament-wound structures, and multidirectional woven structures, while discontinuous-fiber GRP is typically produced by compression molding. There are numerous processes for shaping GRP; in China, hand lay-up, compression molding, and filament winding are widely employed, whereas pultrusion is rapidly developing, with spray and spray-injection processes also being frequently used. The resin serves

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