Cooling apparatus and cooling method for polyethylene insulating sheath of crosslinked cable after extrusion

Abstract

The invention relates to a cooling apparatus and a cooling method for a polyethylene insulating sheath of a crosslinked cable after extrusion. The cooling apparatus comprises a groove-type water tank body; a water inlet structure is arranged at the upper part of the water tank; a water outlet structure is arranged at the lower part of the water tank; a water circulating power apparatus is arranged between the water inlet structure and the water outlet structure; the cooling apparatus is characterized in that plate-like soft silicone plugs are arranged on two end surfaces of the groove-type water tank body; and the peripheries of the soft silicone plugs are hermetically connected with the water tank body. According to the cooling apparatus and the cooling method for the polyethylene insulating sheath of the crosslinked cable after extrusion, the soft silicone plugs are arranged at the part, entering the cooling apparatus, of the cable; a cable via hole of the cable is matched with the diameter of the cable; and air carried by the surface of the cable can be whisked off, so that air bubbles can be prevented from entering cooling water along with the cable, and ''bumps'' on the surface of the cable due to the fact that the air bubbles enter the cooling water can be avoided.

Description

technical field [0001] The invention relates to the technical field of cross-linked cable insulating sheaths, in particular to a post-extrusion cooling device and cooling method for cross-linked cable polyethylene insulating sheaths. Background technique [0002] Polyethylene (PE) is a non-polar material with good electrical properties, but its molecular structure is linear, and it is easy to crack after being extruded into an insulating layer. Cross-linking technology is one of the main means of PE modification. Cross-linked PE can significantly improve its environmental stress resistance, service temperature and mechanical properties at high temperatures. As one of the PE crosslinking methods, silane crosslinking makes PE molecules form a C-Si-O-Si-C crosslinking network. It is currently used in low-voltage cable production for its simplicity, economy and superior performance. Admired by merchants. Since the extrusion temperature, extrusion speed and crosslinking speed o...

AI Technical Summary

Problems solved by technology

[0003] The existing post-extrusion cooling device generally uses a cooling pool for cooling. The cable enters from one end of the cooling pool and leads out from the other end. The cooling pool uses circulating water to cool the cable. Because the cable may have air bubbles attached to the outer surface of its insulating sheath After entering the cooling pool, "pit bags" will be generated at the air bubbles. In addition, because the water is circulating, it is inevitable that some air will be brought into the cooling pool with the circulating water. After the air is attached to the surface of the insulating sheath It will also produce "pits", which affects the surface quality of the cable and needs to be improved

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