The production of Alexandrovsk Machine-Building Plant is based on the belt conveyors. 
The belt tension is performed by the tensioner. The main assembly units and components of the tensioner are: tension carriage, hoist or other cargo device, guide rails of channels, beams, rests with installed end switches for carriage travel limits, supports and fencings. To decrease the force repeatable polyspast pulley block is applied in the rope.
