Abstract: Provided is a child lock structure, hook structure, handle structure, and heating barrel. It includes a barrel ring mouth, a barrel cover, and a turnbuckle. The barrel ring mouth is arranged at the top of the heating barrel. The barrel cover is rotatably clamped at the top of the barrel ring mouth through the turnbuckle. The turnbuckle includes two pressing buckles symmetrically arranged at the top of the barrel ring mouth and two clamping buckles symmetrically arranged at the bottom of the barrel cover. The turnbuckle also includes a clamping groove arranged at the top of the barrel ring mouth and below the pressing buckles, so that the barrel cover and the barrel ring mouth are closed and the pressing buckles and clamping buckles are staggered.