Long-distance belt conveyor can replace two or even more general-purpose belt conveyors designed for engineering sites, terrain, etc., simplifying the technical design of the system, and reducing the number of transfer stations and transfer unloading equipment. As a result, the occupied space of the engineering site is reduced, and the engineering cost, operation and maintenance costs are reduced too. Therefore, many projects at home and abroad have selected long-distance, large-capacity belt conveying machines as transportation equipment.
However, because the long conveying belt conveyor has a long transportation distance and a long transportation route, the remaining materials in the transportation process will cause serious sticking of material on the return rollers and the conveyor belt, which increases the running burden of the conveyor. If the material is more viscous or may contain more water, the situation will become increasingly severe.

Also, because of the long-term long-distance operation for the large-distance conveyor belts, the conveyor belt will be in faster wear and the service life of the conveyor belt also reduces.
In addition, long-distance belt conveyor systems cannot be installed in a factory building or a machine room like conventional belt conveyors. Instead, they are installed in the open air. In winter, a thin layer of ice adheres to the surface of the conveyor belt, especially in ice-cold areas, the freezing of the ice layer and the remaining material further exacerbates the operational burden on the conveyor.
These will undoubtedly reduce the transmission efficiency of the belt conveyor, increase the energy consumption, and even worse, will cause the conveyor belt to off-tracking and even tear.
So, how can we prevent these problems and increase the operating efficiency of long-distance belt conveyors? At present, the cleaning of long-distance belt conveyors at home and abroad is mostly based on the installation of belt-turning devices in the return section. It has been proved that such an arrangement effectively solves the above problems.

Belt-turning device operating principle:
Under normal conditions, long-distance belt conveyors are equipped with two belt-turning devices in the return section, that is, installed at the head and tail. The operation principle is when the conveyor belt is returned and passes through the conveyor head. The belt-turning device forces the conveyor belt to turn 180 degrees, the carrying surface of the conveyor belt (i.e., the working surface of the conveyor belt) is upward, and the non-load bearing surface contacts with the idlers, and when the conveyor belt moves to the tail section of the conveyor and forced the conveyor belt again: turned 180 degrees with its carrying surface facing upwards. After the twice turning of conveyor belt, its carrying surface has returned to its original position and it can continue to assume the mission of transport.
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