The conveyor belt has the simplest structure. It is covered with rubber and wrapped on the upper and lower sides of the core frame. The cover tape is bonded with the cover tape to bond the cover tape to the tape. The ordinary conveyor belt is composed of these three parts, as shown in Figure 5-1.
Ordinary conveyor belts have the characteristics of smooth and flat surface, which can be divided into:
(1) Cover layer. It is divided into a topping layer and a lower layer. The facets are glued to the outside of the core layer. It is determined by the conditions of use whether rubber formulas with oil resistance, cold resistance, flame resistance, heat resistance and ozone resistance are used.
(2) With a core layer. It is the skeleton of the conveyor belt, and bears the main body of the load. According to the strong selection of cotton canvas, nylon cloth, polyester cloth, aramid cloth, steel cord core, the core can be made into a single layer or multiple layers.
(3) Isolation layer. Used for bonding tape cores, different depending on the tape core and different formulas. The choice of cover rubber follows the following principles:
(1) Ordinary wear-resistant belt is selected from natural rubber urethane rubber or mixed with styrene-butadiene rubber.
(2) When high temperature resistance (>130~C) is used, chlorobutyl and EPDM rubber are selected, and the highest is used below 200~C.
(3) The flame-resistant belt is made of chloranium ‘diene, styrene-butadiene rubber and natural rubber, and a flame retardant is added.
(4) The oil-resistant belt uses chlorine J•diene and styrene-butadiene rubber (NBR). If used together with polyethylene, it can resist oxygen.
5) The acid and alkali resistant belt uses neoprene or butyl rubber.
In addition to the above rubber formulations, the cover tape of the conveyor belt can be made into various forms of surface structures, such as convex patterns, concave or round holes, herringbone oil grooves, etc., which are all in the special tape range. The choice of rubber determines the nature of the coating and the ability to bond the skeleton. To this end, the physicochemical properties of various natural and synthetic rubbers are specified.