Method for preparing solid core rod of one-step molded high-voltage composite insulator

Abstract

The invention relates to a method for preparing a solid core rod of a one-step molded high-voltage composite insulator. At present, a large-diameter epoxy glass fiber core rod in particular a large-diameter solid core rod which is used for a high-voltage strut composite insulator and has the diameter of more than 130 millimeters does not exist domestically. The method for preparing the solid core rod comprises the following steps of: selecting an internal mold high pressure foaming system to make an uninterrupted closed cell foamed insulation core body; adopting the combination of a circumferential yarn and a longitudinal yarn to ensure that the circumferential yarn, the longitudinal yarn and the closed cell foamed core body enter a pre-forming mold at the same time; according to different stress strength grades, enwinding the yarn circumferentially for 1 to 3 layers; adopting a vacuum gum injecting method in a gum dipping process; adding the pre-forming mold and a gum injecting hole to a mold part; and putting the closed cell foamed core body, the longitudinal yarn and the circumferential yarn into the mold at the same time to soak an epoxy resin adhesive for solidification molding so as to ensure that the closed cell foamed core body is adhered to a fiber resin layer more firmly. A product produced by the preparation method can replace the large-diameter solid core rod and meet the operating requirements on the core body of the composite insulator.

Description

Technical field: [0001] The invention relates to the technical field of manufacturing high-voltage composite insulators, in particular to a method for preparing a solid mandrel rod of a high-voltage composite insulator formed in one step, in particular to a high-strength epoxy glass fiber solid core with a large diameter of 130 mm or more for high-voltage composite insulators above 500 KV Rod preparation method. Background technique: [0002] Composite insulators are composed of mandrel (core body), fittings, and silicone rubber sheaths. The mandrel plays the role of internal insulation and transmits mechanical loads, the silicone rubber sheath plays the role of outer insulation, and the fittings play the role of connecting both ends. Among them, the role of mandrel is the most important and critical. The mandrel used as internal insulation is divided into solid mandrel and hollow mandrel. The product produced with hollow mandrel is called hollow composite insulator. There ...

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Problems solved by technology

[0005] Limited by 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 Solidification, but the inside of the mandrel may still be in a semi-cured state. Under cooling at room temperature, the mandrel is prone to cracking due to internal stress

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