Alexandrovsk Machine-Building Plant is one of the oldest plants in Ural starting its history since 1802. 
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.
