| 摘要 |
<p>The invention relates to a hydraulically actuatable expander (1) for straightening and repairing partially collapsed pipelines. In order to obtain a high straightening force, it comprises: at least one elongated cylinder housing (2) with a central longitudinal axis (7-7) and one or a plurality of cylinder bores or cylinder sleeves (8) in a single section transverse to said longitudinal axis (7-7); a piston inserted in each cylinder bore or each cylinder sleeve (8), said piston being connected to a hydraulic channel for the expansion of expander segments (10) secured thereto, at least two synchronizing mechanisms arranged at regular intervals in the longitudinal direction of the cylinder housing and being connected to the expander segments (10) in such a manner that all said expander segments expand synchronously to the same extent, where said two synchronizing mechanisms furthermore are interconnected such that the expander segments (10) also expand to the same extent at the position of one synchronizing mechanism as at the position of the second synchronizing mechanism.</p> |
