Patent ID: 8062013
Filing Date: 2011-11-22
Classification: B29C,B29L

Abstract:
1. A device for cooling an extruded thermoplastics pipe, which on exiting an extruding tool is arranged to pass through a calibrator and one or several cooling baths, which device is connected to the extruding tool coaxially with a ring-shaped slot of the extruding tool, and comprises a cylindrical connecting piece, a guide bush which is adapted to the inner dimension of the thermoplastics pipe and closed against the extruding tool, a plurality of means mounted annularly inside the cylindrical side wall of the guide bush in order to direct gaseous cooling medium jets mainly tangentially towards the inner surface of the thermoplastics pipe, a cylindrical protecting pipe arranged to form a ring-shaped flow channel along the inner surface of the thermoplastics pipe, and a central return channel, ending in the guide bush, for a part of the cooling medium flown through the ring-shaped flow channel to be returned to said means influenced by suction effect of the cooling medium flows in order to be redirected towards the inner wall of the thermoplastics pipe, characterized in that the cooling medium is air, whereby a cooling equipment is arranged in the return channel, said cooling equipment comprising at least one heat exchanger mounted in a central frame projecting from the connecting piece and the guide bush, and that each of the means for directing the cooling air flows are rotatably mounted in its own telescopic shaft projecting essentially in a radial direction from the central frame of the device enabling radial movement and rotation of each element around its telescopic shaft.