Vorrichtung zur Herstellung von Wickelrohren aus thermoplastischem Kunststoff

摘要

1321293 Making plastics pipes DYNAMIT NOBEL AG 3 Sept 1970 [3 Sept 1969] 42319/70 Heading F2P Apparatus for producing pipes by spirally winding a band 2 having a longitudinal tongue and a longitudinal channel so that the tongue of one lap is interengaged with the channel of an adjacent lap, comprises a rotatable mandrel 1 and at least one composite means 3 for forcing the tongue and the channel into interengagement said means comprising a plurality of component rollers which together define a configuration corresponding to the configuration of the outer surface of the joint. In the arrangement shown the component rollers 4, 5a, 5b are centralized on axle 6 by springs 10 and are mounted in a frame 7 spring loaded by spring 9. In a second embodiment (Fig. 2, not shown) the three rollers are separately mounted and separately loaded. For removing the pipe from the mandrel there are a plurality of take-off rollers (14) (Figs. 3 and 4, not shown) set at an angle to the axis of the mandrel and either driven by a common motor or separate motors and radially displaceable relative to the axis of the mandrel. The band 2 may be fed direct from an extruder to the mandrel and means to measure the sag in the band between the extruder and the mandrel may be provided which means can be used to control the speed of the take-off rollers. A servomotor mechanism may also be included which monitors the point at which the band runs on to the mandrel and adjusts the positioning of the take-off rollers accordingly.