| 摘要 |
In the case of an extruding installation for plastic pipes, comprising an extruder, a calibrating sleeve connected thereto, arranged in a vacuum tank and provided with a water cooling means, which calibrating sleeve draws the extruded tube against the inner side of its wall, and comprising a downstream through-running cooling chamber, there being provided a wall thickness measuring device with one or more measuring heads operating on the ultrasonic principle and aligned radially with respect to the extruded pipe, the intension is to reduce the dead time between the wall thickness measurement and the correction of the extruder setting. For this purpose, it is provided that the calibrating sleeve (12) protrudes in the direction of the extruder beyond the vacuum tank (10) and has at its front end (16) an intensive cooling ring (17) connecting the vacuum tank (10) to the vacuum and water supply, and that the wall thickness measuring device (measuring ring 19) is arranged between the intensive cooling ring (17) and the vacuum tank (10) outside the vacuum tank (10). <IMAGE> |
