Perforating Apparatus

摘要

A perforation apparatus has a mandrel to support at least a part of the piping that is to be perforated from the interior of the piping. A punch housing has an aperture through which the piping is moveable and punches arranged radially around the aperture. At least some of the punches have an associated clamping mechanism that applies a force to the exterior of the piping adjacent the respective punch, to push or hold the piping against the mandrel. A driven annular housing rotates adjacent the punch housing. A plurality of rollers engage a surface on the punches during rotation of the annular housing to operate the punches upon contact and to operate the clamping mechanisms. A punch retracting mechanism retracts the punches after each operation. At least one mechanism longitudinally and rotationally moves the piping relative to the punch housing and drives the annular housing.