Drive drum diameter When the conveyor belt passes through the drum, it will generate bending stress, causing core fatigue. The smaller the diameter, the greater the bending stress. Obviously, increasing the drum diameter is beneficial for improving the service life of the conveyor belt. However, when it reaches a certain value, the reduction in bending stress is not significant, and it can also increase the volume of the equipment. Therefore, to ensure that the bending stress of the conveyor belt is not too large, the small diameter of the drum should be limited. The principle for selecting the diameter D of the driving drum is: when using mechanical joints for multi-layer core conveyor belts, D ≥ 100i, mm (i is the number of canvas layers); When using vulcanized joints, based on the trapezoidal overlap of the joint, it is easy to peel off under bending stress, so D ≥ 125i, mm. When using mechanical joints for the integrated core conveyor belt, D ≥ K8, mm (k depends on the parameters of the core skeleton material; 8 is the core thickness, mm). When using a steel rope core conveyor belt, D=(150-200) (t, mm (d is the diameter of the steel wire rope, mm). The diameter of the reversing drum is determined based on factors such as the diameter of the driving drum, the percentage of force applied, and the angle of the conveyor belt around the drum.
Transition distance The conveyor belt section between the head and tail drums of the conveyor and the group carrying idlers is called the transition section. In the transition section, the conveyor belt changes from groove to parallel or from parallel to groove, and the edge of the conveyor belt is stretched to generate additional tensile stress. The smaller the length of the transition section, the greater the additional tensile stress, which causes serious wear on the edges and side rollers of the conveyor belt. As a result, the conveyor belt may experience premature fatigue, and even cause the edge of the conveyor belt to break. To ensure that the local elongation of the conveyor belt edge does not exceed the elongation rate of the conveyor belt, the length of the transition section should not be too small. For fiber core conveyor belts, the length of the transition section is taken as 1.3 times the distance between the rollers; Due to the allowable elongation of the steel rope core conveyor belt being 0.2%, the length of the transition section is calculated according to the formula L ≥ 2.67cc B, where B is the bandwidth, m; D is the groove angle of the supporting rollers. If the L value is much larger than the spacing between the supporting rollers, several transition roller groups with smaller groove angles should be installed between the drum and the group supporting rollers to prevent sagging and spillage.
Feeding device The reasonable structure of the feeding device largely determines the service life of the conveyor belt. In order to reduce the wear and impact stress of the material on the conveyor belt, the technical requirement f-1 for designing and selecting the feeding device is that the speed and direction of the material fed onto the conveyor belt should be approximately consistent with the belt speed; Minimize the drop of materials as much as possible, especially to prevent large pieces of materials from falling directly onto the conveyor belt from a high place; The material should form a free and continuous flow inside the feeding device, and be able to be evenly loaded into the middle of the conveyor belt in the correct shape, without material accumulation or spillage; Try to unload the powder and fine blocks onto the conveyor belt as much as possible to form a cushion layer, and then load the block materials. A buffer roller group should also be installed at the loading point to reduce the impact force of materials on the conveyor belt. The installation position of the feeding funnel must ensure that the material falls between two buffer roller groups, rather than on one group of buffer rollers.
Slotting angle of the support roller The load-bearing branch usually adopts a groove shaped roller group composed of three rollers, and the angle between the side roller and the middle roller is called the groove angle. Within a certain limit, the larger the groove angle, the greater the material flow rate. But into
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