1. Extruded sheath and adhesive umbrella disc type: After the mandrel is roughened and brushed with adhesive, it is made into a sheath by an extrusion machine. After secondary vulcanization, the vulcanized umbrella pieces are flashed at room temperature in the umbrella threading machine. Vulcanized silicone rubber bonding, completed after end connection fittings and sealing treatment. This technology has high production efficiency. Due to the low outlet temperature of domestic extruders, the bonding of the mandrel and the sheath is mainly performed by secondary vulcanization, and the bonding surface between the loose disk and the sheath is small.
2. Segmented or one-time injection into form: After the mandrel is roughened and brushed with adhesive, it is injection molded in the mold by an injection molding machine. Insulators with high voltage levels are made by segmented injection molding, followed by secondary vulcanization and fitting sealing. The core rod and sheath of this process are thermally coupled, with good bonding effect. The internal insulation only has one layer of interface and few interfaces. It is a relatively new production technology.
3. Single umbrella set bonded and flowered sleeve Baohuajia vertical glue filling type: After the outer sheath of the mandrel is molded, it is introduced into the umbrella string bonded by room temperature vulcanized silicone rubber, and the gaps are vacuum-filled with polymer filling Glue and seal with end connecting fittings to complete the production. This technology is an early stage process with many processes and large dispersion. Its glue filling technology is difficult to ensure the fullness of mass production of voltage levels of 220KV and above. Since the core rod has deflection and the glue filling gap is small, the contact between the core rod and the inner wall of the umbrella string can easily cause half of the glue channel to be blocked, resulting in a partial lack of filling glue and an insulation defect.
