| 摘要 |
A power shovel including a frame, a boom mounted on the frame, a crowd drive mechanism mounted on the boom, and a dipper handle supported by the crowd mechanism. A dipper is connected to the handle for movement therewith, the dipper defining material receiving and material discharging openings with substantially identical areas. The dipper includes a generally planar back wall, a generally planar front wall, the front wall being opposite and substantially parallel to the back wall, generally trapezoidal and substantially parallel side walls connecting the back wall and the front wall, and a lip arranged along an upper edge of the front wall. A lip angle of the dipper is between three and five degrees, and a tooth angle is between 46 and 50 degrees. The dipper also includes a dipper door that is mounted on the back wall for pivotable movement relative thereto, the door and the back wall forming an acute angle when the door is closed, and the door and the front wall forming an obtuse angle when the door is closed.
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