Belt material

One more thing: the belt is relatively smooth, at least on the inside side. The question is, if the belt breaks, how do you repair it? Will it become uneven inside, causing high resistance during rotation?

First, I need to correct your mistake: the conveyor belt is actually pretty smooth on both sides. There’s just anti-slip rubber on the drive rollers. 1. There are two types of belts used in coking: coal transport belts and coke transport belts. The specific material used depends on the application. For coal transport belts, there is a difference between belts used for unloading coal and those used for mixing coal; the number of layers in these belts varies due to different loads. The coal mixing belts in our factory have 9 layers (the load is relatively lower compared to those used for unloading coal), while the belts used for unloading coal have 11 layers. As for coke transport belts, those in our factory have 5 layers, but they must be heat-resistant belts. 2. Belt connection: For short belts used in loading operations, iron clasp-type connectors can be used, as the load is low and the belts are short. If the coke or coal conveyor belt breaks, the joint area must be ground into a wedge shape using a manual grinder, and the wedge should be long. Then stick them together with glue. In winter, it is also necessary to use heat to speed up the bonding process. If time permits, it is best not to mix a quick-drying agent into the glue.

For bonding belts, pre-vulcanization is the best method; it results in strong joints that are less likely to separate, and the belts can be used for a long time. If they break during production, metal clamps can be used temporarily to restore functionality.

Belt bonding can be divided into cold bonding and hot bonding (vulcanization). When our belt systems were delivered, all the joints were made using hot vulcanization; however, after they went into operation, replacing the belts was basically done by cold bonding. Since the cold bonding time is short, its impact on production is minimal. The belt is generally stripped in a stepped manner according to the number of layers, with both ends made stepped as well, which allows for a gentle handling. The two adhesive joints are at an angle (meaning the step forms an oblique parallelogram); as a result, after bonding, the joints make contact in the form of a line as they pass over the roller, rather than through surface contact, which helps prevent cracking. Prepare the groove properly, grind it clean, remove any moisture from it, apply glue to both sides (just as one would apply glue to a bicycle belt), wait until it dries to a certain extent, then attach it to the steel plate. Use a hammer to press it firmly in place, in a similar manner to how one presses glue onto a bicycle belt to fix a patch. Finally, individual areas can be reinforced with small nails.

It seems that belts are classified based on the number of layers of fabric and the thickness of the rubber layer in millimeters; those used for transporting coke are generally EP200 belts capable of withstanding temperatures up to 150°. Initial installation is carried out through hot bonding using a vulcanizing machine.