| 摘要 |
An apparatus for pipe slitting according to the invention includes a front rod configured for connection to a string of rods, a frame connected to a rear end of the rod having a lengthwise slot therein, an axle mounted in the slot, a rolling cutter mounted on the axle such that a portion of the cutter protrudes from the slot in a position suitable for slitting a ductile pipe through which the slitter is drawn, and a frustoconical expander connected to the rear of the frame and sized to expand a slit pipe. The frame may have has a series of lengthwise slots therein with an axle mounted in each slot, and a rolling cutter mounted on each axle such that a portion of each cutter protrudes from the slot in a position suitable for slitting a ductile pipe through which the slitter is drawn. In such an embodiment, preferably each rolling cutter behind the front cutter extends further outward than the cutter preceding it, and the frame has a sliding reaction surface (free of wheels) that engages an inner wall of the pipeline on the side opposite the rolling cutters.
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