Steam crosslinking technology adopting steam crosslinking special tray

Abstract

The invention discloses a steam crosslinking technology adopting a steam crosslinking special tray. The special tray is adopted in the crosslinking technology, and has the characteristics of a conventional cable tray. An extruded-insulated cable is wound on the tray, the edge of the tray is wrapped by heat insulation canvas to form a wrapped layer, a steel belt is used for fastening, fixing and sealing, two sealed inflation spaces on the inner layer and the outer layer of the tray are formed and communicate through an air hole formed in the body of an inner barrel of the tray, heating steam isintroduced through air inlets on the inner layer and the outer layer at the same time, heating steam permeates into a silane modified polyethylene cable insulation layer mixed with a silanol condensation catalyst from the inner layer and the outer layer in two directions, the pressure and temperature in the tray rapidly reach the conditions needed when organosilane crosslinked polyethylene completes crosslinking reaction within a short time, crosslinking reaction is rapidly completed, the sealing canvas is removed after crosslinking is finished, the whole tray of cable can enter a next working procedure for production after being cooled, and the crosslinking technology is thorough, rapid and saves time and steam.

Description

technical field [0001] The invention relates to the technical field of a cable steam crosslinking process, in particular to a steam crosslinking process using a steam crosslinking special tray. Background technique [0002] The two-step cross-linking process is a common process for cross-linking in the production process of XLPE insulated cables. Extrusion insulation is the first step, and steam cross-linking is the second step. [0003] The conventional cable steam cross-linking process must place the extruded and insulated cable reel in the steam room, and then fill the steam room with steam. The cross-linking reaction of the insulated wire core will take 4 to 8 hours depending on the thickness of the insulation layer. , building a steam room alone occupies a large space and requires high investment. A small number of factories design their own or use containers as steam cross-linking rooms. Because of the large space, the thermal insulation effect and sealing performance ...

AI Technical Summary

Problems solved by technology

[0003] The conventional cable steam cross-linking process must place the extruded and insulated cable reel in the steam room, and then fill the steam room with steam. The cross-linking reaction of the insulated wire core will take 4 to 8 hours depending on the thickness of the insulation layer. , building a steam room alone occupies a large space and requires high investment. A small number of factories design their own or use containers as steam cross-linking rooms. Because of the large space, the thermal insulation effect and sealing performance are poor, the steam room is raised to the specified temperature. It takes a long time, and the steam consumption is large, and the energy utilization rate is low; the cables need to use forklifts and other equipment to enter and exit the steam room, and the turnover process takes a long time, which affects the production progress

[0004] The heating of the cable in the steam room is a process of gradually penetrating and heating from the outer layer of the cable reel to the inner layer, resulting in a relatively short heating time and low temperature for the inner layer insulation. After the steam crosslinking is completed, the crosslinking degree of the outer layer insulation is likely to pass However, if the cross-linking degree of the inner layer insulation is unqualified, it will affect the product quality.

In practice, a large number of uncrosslinked cables are used in practice, burying serious safety hazards

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