| 摘要 |
A self-propelled work machine is based on a conventional tracked excavator (12) and, as shown, when modified for use as a timber harvester the conventional excavator arm has been removed and replaced by a parallel motion timber crane (24) mounted on the slewable platform (16) by means of a tilting crane boom (32) carrying a secondary slewing mechanism (34). The secondary slewing mechanism (34) enables a harvesting head (26) to be steered between standing trees for thinning to be carried out without the overhanging back (22) of the platform (16) colliding with trees. Controlled tilting of the crane boom (34) enables tilting of the secondary slewing axis to match the slope of ground on which trees are standing, enabling faster working with less damage. |
