The mandrels used for pillar ceramic insulators generally require high mechanical strength and good electrical properties. The bending load on the rod-shaped pillar ceramic insulator will eventually be applied to the core rod of the insulator, so the selected core rod must meet the rated bending mechanical load of the product; the selection of the cross-sectional diameter of the core rod is to use multiple repeated tests. At present, domestic manufacturers mostly use integral molded jackets and then wear umbrellas. The conditions of temperature, time and vulcanization pressure should be strictly controlled during injection.
To ensure the vulcanization quality of the sheath. When wearing an umbrella, you must strictly control the ambient temperature and parking time to ensure that the umbrella and the sheath are firmly bonded. The increased cost of using a silicone rubber umbrella skirt can be compensated by the higher overall pass rate of the ceramic pillar. It is estimated that the selling price is equivalent to that of the ceramic pillar insulator of the same specification. This combined insulator structure greatly reduces the difficulty of manufacturing high-strength post insulators, significantly improves the stain resistance, and has considerable development potential.