System for manufacturing an irrigation pipe and a device and method for detecting holes in the wall of an irrigation pipe

摘要

A system for manufacturing an irrigation pipe comprises an extrusion unit, a calibrator unit, a cooling unit for cooling the irrigation pipe in a cooling liquid, and a traction unit for drawing the irrigation pipe in the cooling unit. The cooling unit comprises a device for detecting holes in the wall of the irrigation pipe and arranged for being immersed in the cooling liquid. The device for detecting holes comprises at least one optical transmitter and at least one optical receiver which define an optical barrier. The device is arranged so that the holes in the irrigation pipe located below the device produce gas bubbles which modify the optical barrier.

主权项

1. A system for manufacturing an irrigation pipe comprising
an extrusion unit for extruding said irrigation pipe, a calibrator unit for regulating the diameter of said irrigation pipe, a cooling unit for cooling said irrigation pipe in a cooling liquid, a traction unit for drawing the irrigation pipe in said cooling unit, said cooling unit comprising a device for detecting holes in a wall of said irrigation pipe and arranged for being immersed in the cooling liquid, said device for detecting holes comprising: at least one optical transmitter and at least one optical receiver which define an optical barrier, said device for detecting holes being arranged so that holes in a wall of said irrigation pipe which is located below said device can produce gas bubbles which can modify said optical barrier.