Overland conveyors range from a few kilometers to tens of kilometers. In the design process of overland conveyors, it is particularly necessary to pay attention to the economy and flexibility of the entire conveyor system. So, what are the design considerations for overland conveyors? Some unremarkable problems in belt conveyors used in several kilometers in general, such as the selection of idler diameter, spacing and quantity, become a big problem in long-distance machines. Overland conveyor design processing must take all factors in.
The cost of the conveyor belt of the long-distance conveyor accounts for more than 1/2 of the total cost of the belt conveyor, so it is very important to choose the appropriate conveyor belt. The safety factor and the joint method directly affect the cost of the entire machine. You should choose a type of belt during overland conveyor design procedure.
Whether the driving mode is single drive, multi-point multi-drive, or intermediate friction drive, it is of great significance to decide whether to reduce the strength of the conveyor belt. If single head drive is selected, the power of the head is as high as several kilowatts, a high-voltage motor must be used, and the strength of the conveyor belt must be a steel rope core or an aramid core. If the intermediate friction drive method is selected, the belt conveyor can be up to tens of kilometers, and high-strength nylon belt or aramid belt should be used. In addition, whether the motor is a variable-speed DC motor or a hydraulic coupling plus an AC motor, the two prices differ greatly.
The selection of idlers, especially the diameter and spacing of idlers for long distance belt conveyors is more important. The total weight of the idlers accounts for about 30% of the weight of the whole machine. For example, if the distance between the idlers is changed from 1.5m to 2m, or the diameter of 133mm is changed to a larger level, it will determine the cost of the idlers and reduce the running resistance coefficient. For example, the 20km belt conveyor of Cana Iron Mine in Australia was changed from 133mm to 178mm diameter idlers , and the distance between idlers was changed from 1.75m to 2m,As a result, the running resistance coefficient decreased from 0.03 to 0.0098;
The selection of various calculation parameters is different from that of ordinary belt conveyors. Smaller errors will lead to larger absolute errors. For the shorter dynamic distances, rigid dynamic methods can be used for processing, and long distances are not suitable. Since the conveyor belt is a viscoelastic body, the calculation of the tensile force of each point of the conveyor belt when starting and breaking the conveyor belt is very different from the calculation result of the rigid body mechanical method.
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