| 摘要 |
An improved multi-purpose drilling machine of the type including a self-propelled vehicle to which is fitted a fifth wheel ( 5 ) that carries a support and movement unit ( 2 ) for a drilling-rod boom ( 4 ). The machine includes a system of counterweights ( 6 ) mounted on the fifth wheel ( 5 ) on the opposite side of the drilling-rod boom to the axis of rotation of the fifth wheel. The counterweights are designed to offset, at least partly, the moment created by the drilling-rod boom on the structure of the machine. In particular, the drilling-rod boom ( 4 ) is mounted at the end of an upright ( 3 ), which in turn is hinged to the fifth wheel ( 5 ) so that the boom ( 4 ) can be moved from a substantially vertical to a substantially horizontal position and vice versa, the fifth wheel ( 5 ) rotating around an axis parallel to the longitudinal axis of the machine.
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