| 摘要 |
A support tub for a dragline excavating machine having an outer peripheral wall and top and bottom walls respectively affixed to an upper edge and a lower edge of the outer wall. The bottom wall rests on the ground during excavating operation of the machine and a circular ring support on which a circular rail is mounted is positioned above the top wall. The machine is rotatably movable on the rail and is thereby supported through the ring support by the tub. The tub includes an inner ring wall concentric with the track circular ring support, a plurality of vertically disposed radial plates each extending radially outward from the inner ring wall to the outer peripheral wall, and a plurality of vertically disposed chordal plates each extending in the direction of a chord of the outer peripheral wall. A plurality of triangular compartments are each formed by the intersection of two of the chordal plates and a radial plate or by the intersection of three chordal plates. A plurality of intersections are formed by the intersecting of different groups of three of the plurality of chordal plates and a plurality of intersections are formed by the intersecting of different groups of two of the plurality of chordal plates and one of the plurality of radial plates. Pairs of radial plates are aligned and, together with the ring wall, form a continuous diameter member across the peripheral outer wall. All of the triangular compartments are equilateral sided and are of the same size. |
