Preparation method of large-diameter composite insulator solid core rod

Abstract

The invention discloses a preparation method of a large-diameter composite insulator solid core rod. The preparation method comprises the following steps of: selecting a solid pultrusion insulating core rod with a diameter not larger than 130mm; roughly processing the outer surface of the core rod, washing the outer surface by using acetone, then putting the core rod in an oven and keeping temperature constant; coating a 2 percent absolute alcohol solution on the outer surface of the core rod, then putting the core rod in the oven and keeping the temperature constant for 1 hour; weighing resin glue in proportion, pouring the resin glue into a vacuum stirrer, stirring for 20 minutes in vacuum and standing for 50 minutes; mounting the treated solid core rod on a numerical control winding machine and starting winding until the winding machine winds to a design size; vacuumizing and injecting the resin glue; after finishing injecting the resin glue, closing valves at both ends and putting the core rod in a curing oven for heating and stepped curing; and processing the outer surface and determining the size as a required length. The prepared core rod has high bonding strength and small-angle winding, and the content of resin of a secondary winding layer is similar to that of the matrix solid rod. The bonding of interlayer interfaces is firm, and cracks cannot occur, thus the prepared core rod can be widely applied to electric overhead lines.

Description

technical field [0001] The invention relates to an insulator connected with a power wire, in particular to a method for preparing a large-diameter composite insulator solid mandrel with a diameter greater than 130mm. Background technique [0002] Composite insulators are composed of mandrel (core body), fittings, and silicone rubber sheath. The mandrel body plays the role of internal insulation and transfers mechanical load. . Among them, the role of mandrel body is the most important and critical. The mandrel body used as internal insulation is divided into solid mandrel body and hollow mandrel body. The product produced with hollow mandrel body is called hollow composite insulator, and the product produced with solid mandrel body is called solid composite insulator. Solid composite insulators include the following three types: suspension composite insulators, column composite insulators and curved wall composite insulators. [0003] At present, as hollow composite insul...

AI Technical Summary

Problems solved by technology

[0005] Due to the limitations of the existing process, the continuous pultrusion process cannot realize the preparation of epoxy glass fiber core rods with a diameter greater than 130mm or the success rate is very low

The reasons are as follows. During the curing and molding process of the large-diameter mandrel, due to the large diameter of the mandrel, the heat on the mold is transmitted to the inside of the mandrel at a slower speed; if the formed glass fiber mandrel slows down the heating speed to If the inside of the mandrel is completely solidified, the mandrel will stick to the mold, and the traction device will not move when the mold is released. If the pulling force is increased, the mold will be damaged; if the existing heating conditions are used, the surface of the mandrel will Cured, but the inside of the mandrel may still be in a semi-cured state. At this time, the mandrel is prone to cracking due to internal stress during pultrusion

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