| 主权项 |
1. A material extraction system for an underground mine, the system comprising:
a material-cutting machine; and a face conveyor for transporting material cut by the material-cutting machine along a longitudinal axis, the face conveyor including:
a plurality of line pans positioned adjacent to one another along the longitudinal axis, each line pan including a race that includes two opposed sidewalls, wherein one of the sidewalls includes a top race portion protruding laterally inwardly toward the longitudinal axis and defining a top face facing away from the line pan, a bottom face facing down into the line pan, and a substantially vertical outer race face extending between the top and bottom faces, the vertical outer race face facing laterally inwardly toward the longitudinal axis, wherein the sidewall also includes a substantially vertical inner race face positioned below the substantially vertical outer race face, the inner race face facing laterally inwardly toward the longitudinal axis,a plurality of flight-bars extending laterally across the line pans and received by the race, each flight-bar including an end having an upper guide surface facing laterally outwardly away from the longitudinal axis such that the upper guide surface faces one of the outer race faces, and a lower guide surface facing laterally outwardly away from the longitudinal axis such that the lower guide surface faces one of the inner race faces, anda connecting member extending through the plurality of flight-bars and coupling the flight-bars to one another, wherein lateral movement of any one of the flight-bars causing the upper guide surface to contact the outer race face substantially simultaneously causes the lower guide surface to contact the inner race face. |
