| 摘要 |
An excavation device comprises a pair of milling wheels with a substantially horizontal axis (X) of rotation, each peripherally equipped with excavation means, to define an excavation front substantially parallel to the axis (X), chain-type transmission means to draw in rotation, in a first operating condition, each of the milling wheels, in which the transmission means is driven by motor means and is also provided, on its side which is external during use, with excavation means, and also comprises thrust means able to be activated to selectively move the transmission means into a second operating position, widened and external with respect to the first operating condition.
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