Abstract. The issue of the influence of tension of the traction belt of intermediate drive of the multi-drive belt conveyor on the value of zones of relative rest and sliding of the traction and carrying belts is considered. A variety of values of proportional band of tractive effort regulation of the intermediate drive of belt conveyor while it is being controlled by the tensioning device was obtained in percentage terms. Recommendations on the control of the intermediate drive of belt conveyor by means of the tensioning device when starting and productivity changes are provided.
IntroductionThe modern development of the mining industry requires increased attention to the state and prospects of the development of conveyor transport [7], including the movement of goods over significant distances along a complex route, often without the possibility of intermediate transshipment. To accomplish this task, conveyors equipped with drive systems, including two or more drives, are widely used. One of the most widely used solutions in the design of belt conveyors is the use in their design of traction belt circuit as an intermediate drive.When the traction force is transferred from the traction belt to the load-bearing one, zones of relative rest and slip are formed in the area of their contact. The process of formation of these zones is described in [1,8]. In the zone of relative slippage, the traction is transferred to the load-carrying belt. As the length of this zone increases, the traction force realized by the drive increases. When the zone of relative rest decreases to zero value, the clutch disengages, and the drive slips.To determine the lengths of zones of relative rest and slip of belts, several different approaches are used, considered in [1,3,6,9]. The most precise method is the one proposed in [3], which differs from the methods proposed in [6,9] by the following features: 1) small values of changes in the speeds of belts are taken into account, the account of which has a significant effect on the distribution of traction forces between drives; 2) the resistance to the motion of belts is given taking into account their separation into resistances, which depend on the tension of belts and which do not depend on them; 3) mechanical characteristics of electric motors of drives are taken into account in the form of nonlinear functions. The method proposed in [1] is based on the determination of values of zones of relative rest and slip, on the basis of the magnitude of the driving force of drive, as specified by the designer.Recently, in the design of belt conveyors, drives with a frequency conversion control system [8] are