Hopper freight car

HOPPER FREIGHT CAR (EN: hopper; DE: Bunkerwagen; FR: wagon-silo; ES: vagon tolva; RU: бункер-вагон) is the railway transport platform, which is equipped with the chain conveyor at the bottom; the hopper freight car is mainly used at the tunneling works for the transportation of the rock masses. The hopper freight car has been developed during the end of the 1960-ies within Sweden. The platform is equipped with the high lateral walls, and is open at the both ends; it is unloaded through the bottom. In case of the transportation of the strong and abrasive rocks, they coat the all-welded casing of the hopper freight car with the manganese steel. From the one end, there is loaded into the hopper freight car the rock mass, which is evenly distributed throughout the casing by the conveyor.

The hopper freight cars are transported by the locomotive, are unloaded automatically (between the rails, or onto one of the sides with the help of the conveyor). The load lifting capacity of the hopper freight cars, which are used at the mining works within the USSR and abroad, is 15-25 tonnes. The maximal speed of the movement is 20 kilometres per hour, the duration of the unloading is 1-2.5 minutes. The width of the hopper freight car is 1500 millimetres, the height of the loading is 1200-1400 millimetres. The hopper freight car with the volume capacity of up to 12 cubic metres works within the mine workings with the cross section of 4 square metres. The existence of the two rotating bogies (the railway gauge is 750 millimetres) permits to pass the curvatures with the radius of 12-15 metres. The train with the volume capacity of 20-30 cubic metres, which comprises two or three hopper freight cars with hydraulic lifts, permits to haul from the stope all the rock mass, which is broken during one cycle.