Fire-retardant segmented isolation device

The invention relates to a fire-retardant segmented isolation device. When a cable in a second blocking cylinder is on fire, it shows that a first blocking cylinder or a third blocking cylinder cannotblock the fire from being transmitted to the second blocking cylinder. At the moment, an ignition sleeve is ignited, and due to the fact that the ignition sleeve is made of flammable materials, an ignition part can be rapidly ignited, and high temperature can be rapidly transmitted to a fixing column. The fixing column begins to deform and soften at high temperature, and the strength is reduced.At the moment, under the action of pressure of external water on a blocking plate, the second end of the blocking plate is loosened, the blocking plate can rotate around the first end towards the interior of the second blocking cylinder, an opening is opened, water can be poured into the second blocking cylinder, and fire is extinguished. Therefore, the fire can be prevented from spreading continuously, and life and proper