Annular smoke collecting hood system for middle chute of two-connected furnace

The utility model provides an annular exhaust fume collecting hood system for a middle chute of a two-connected furnace. Wherein the two continuous furnaces are a smelting furnace and a converting furnace; the middle chute is arranged between the smelting furnace and the converting furnace; the annular exhaust fume collecting hood system consists of a first annular exhaust fume collecting hood, asecond annular exhaust fume collecting hood and a third annular exhaust fume collecting hood; wherein the first ring exhaust fume collecting hood is fixedly arranged above the joint of the smelting furnace and the middle chute, the second ring exhaust fume collecting hood is movably arranged above the middle chute, and the third ring exhaust fume collecting hood is fixedly arranged above the jointof the converting furnace and the middle chute. The annular exhaust fume collecting hood system further comprises an annular air collecting pipe and an annular air collecting fan, one end of the annular air collecting pipe is