Rotatable electric cantilever gas-collecting hood

The utility model discloses a rotatable electric cantilever gas-collecting hood which comprises an exhaust pipe, a gas-collecting hood body is movably installed at one axial end of the exhaust pipe, a limiting mechanism used for limiting the gas-collecting hood body is arranged on the radial outer wall of the exhaust pipe, the limiting mechanism comprises an inserting rod and a limiting block, and an annular groove is formed in one axial end of the gas-collecting hood body. The inserting rod is in sliding connection with one axial end of the gas collecting hood through the annular groove, the limiting block is in sliding connection with the radial outer wall of the inserting rod, an inserting groove used for allowing the inserting rod to be inserted is formed in one axial end of the exhaust pipe, and a groove used for allowing the limiting block to be inserted is formed in the side wall of an inner cavity of the inserting groove. The time and energy required for mounting the gas-collecting hood and the exhaus