| 摘要 |
An arrangement or mounting swing cylinders in a boom for a rock drifting uni t, comprising a frame (1), a boom (2) pivotally connected about vertical and horizontal shafts (3, 4), relative to the frame (1), a lift cylinder (5) connected between the frame (1) and the boom (2), a swing cylinder (6) connected between the frame (1) and the boom (2), a support (7) for a feed beam, pivotally connected to the other end of the boom (2) about horizontal and vertical shafts (8, 9), a tilt cylinder (10), connected between the support (7) and the boom (2), and a transverse swing cylinder (11) connected between the support (7) and the boom (2). In the invention the swing cylinder (6) is coupled at an angle (.alpha.), relative to the longitudinal axis of t he boom (2), from the frame (1) to the end of the boom (2) vertically downward so that with the boom (2) in the middle of its upper and lower angl es of altitude, the swing cylinder (6) is essentially horizontal.
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