Abstract
Surface mining operations lead to an increase in the depth of open pits. As a result, there is a need to choose a conveyor transport, which allows transporting rock mass to a great height at high lifting angle. Conveyors with deep trough belts and tubular and steep incline belt conveyors are used to transport rock mass along curved and vertical routes. The use of conveyors adapted to the conditions of deep open pits allows to reduce the length of the route and to cut capital expenditures and energy costs for transporting rock mass. The main difference the existing types of steep incline conveyors is the way the cargo on the belt is kept from spontaneously moving downwards. In this work, the main types of steep incline conveyors, their advantages and disadvantages are considered. It is noted that in order to achieve maximum efficiency in transporting large pieces of rock mass in deep open pits, it is advisable to use double-circuit type "sandwich" belt conveyors, and partitions on the cargo belt. Steep incline conveyors and belts developed by Flexowell (USA), Savatech (Ukraine), Metso Outotec (Finland), ContiTech Transportbandsysteme GmbH (Germany), and steep incline conveyor with a double-circuit belt (Uzbekistan) are considered. Recommendations for choosing the type of steep incline conveyor are given. The main technical and technological parameters of tubular conveyors, which are currently in operation, are considered. It is noted that the maximum angle of inclination of tubular belt conveyors for transporting bulk cargoes depends on the coefficient of internal friction of the cargo, the coefficient of friction of the cargo on the belt and the rate of the belt filling. The ranges of change in the maximum angles of inclination of tubular conveyors are determined. Based on the analysis of the technical and technological parameters of the maximum angles of inclination of a tubular conveyor and a belt hold-down conveyor, it was found that the maximum angle of inclination of the hold-down conveyor is 5–10degrees higher than the maximum angle of inclination of the tubular conveyor. However, the cost and design complexity of the hold-down conveyor is higher than that of a tubular conveyor. It is recommended to use tubular conveyors on sections of the route with an inclination angle of up to 30 degrees. Keywords: open pit, steep incline conveyer, belt, angle of inclination, cargo.
Published Version
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