1. Single umbrella set bonded with flower set Baohua plus vertical filling type: After the outer moulded cover of the core rod, it is passed into the umbrella string bonded by room temperature vulcanized silicone rubber, the gap is vacuum-filled with polymer filler, and the end is connected to the goldfitting to seal it. This technology is an early process, many processes, large dispersion, and its glue-filling technology is difficult to ensure the fullness of 220KV and above voltage levels in mass production. Due to the deflection of the mandrel and the small glue filling gap, the contact between the mandrel and the inner wall of the umbrella string is easy to block half of the glue channel, resulting in local no glue filling and forming insulation defects.
2. Extruded sheath and adhesive umbrella tray type: the core rod is coated with the binding agent of the brushing treatment brush, and the sheath is made by the extruding machine. After secondary vulcanization, the vulcanized umbrella is bonded with the room temperature vulcanized silicone rubber in the umbrella threading machine, and the end is connected to the hardware and sealed. The technology has high production efficiency, because of the low exit temperature of the domestic extruder, the bond between the core rod and the sheath is mainly carried out by secondary vulcanization, and the bonding surface between the loose disc and the sheath is small.
3. Step by step or injection form: the mandrel is injected into the mold by injection molding machine after brushing the binding agent. The insulators with high voltage grade are finished by sectional injection molding, secondary vulcanization, connection and sealing of fittings. The core rod and sheath of this process are hot coupled, the bonding effect is good, the internal insulation has only one layer of interface, the interface is less, it is a relatively new production technology.
