| 摘要 |
Apparatus 100 for performing a cutting operation on an inner wall of a pipeline from within the pipeline, the apparatus being propellable longitudinally along and within the pipeline, wherein the apparatus comprises, (e.g. in a dedicated drill module) thereof: cutting means 440 for performing the cutting operation on the pipeline from therewithin, drive means 410a, 410b for driving the cutting means 440 so as to perform the cutting operation when in a cutting relationship with the pipeline inner wall to be cut, and displacement means (460a, 460b; 462a, 462b; 468a, 468b) for advancing or retracting the cutting means 440 into or from the said cutting relationship with the pipeline inner wall. The drive means may comprise one or more electrical motor(s) driving the cutting means by way of gears. The means for advancing and retracting may comprise plates (460a, 460b; 462a, 462b) having inclined slots (470a, 470b; 472a, 472b) which cooperate with pins (468a, 468b) when axially moved by fluid actuators (420a, 420b) |
