4 A Device of Molding Rectangular Tube for Corrugated Pipe

摘要

The present invention is configured to quickly cure the outer surface of the small circular tube extruded and supplied from the die to the required hardness to guide to the sizing side, so as to obtain a more precise and uniformly shaped small square tube, It is to provide a molding apparatus of a small square tube to maximize the productivity by improving the efficiency of the molding of small square tube.;The molding apparatus of the small square tube of the present invention has a die 10 for continuously extruding the small circular tube 3 by having an arc-shaped melt resin passage 11 therein and disposed in front of the die 10. Sizing having a vacuum box 20 which is installed to maintain a vacuum state therein, and a rectangular sizing passage 31 installed in the vacuum box 20 and having suction holes 32 formed at predetermined intervals ( 30) and a guide cooling means (40) disposed at the front inlet of the vacuum box (20) and having a guide passage (41) communicating with the sizing passage (31) and configured to pass water through the cooling water. The guide cooling means 40 includes a plurality of cool water inlet holes 42 and a coolant discharge hole that are radially drilled to face each other in a single set centering on an arc-shaped guide passage 41 formed at a central portion thereof. ), And in the guide passage 41 The cooling water inlet hole 42 and the cooling water discharging hole 43 to be communicated to a central portion so that the back of the open space so formed through the cooling water space (44) is secured to the larger diameter than the guide path 41.