Mesh belt type hot air circulation tempering furnace

The invention belongs to the technical field of mesh belt type tempering furnaces, and particularly relates to a mesh belt type hot air circulation tempering furnace, which comprises a base, a shell, a heating device, a conveyor belt, a heat insulation plate, a heat insulation plate, a heat insulation plate, a heat insulation plate and a heat insulation plate, the cooling device comprises an annular barrel, the annular barrel is located between the shell and the heating device, a through hole is formed in the annular barrel, the outer wall of the annular barrel slides relative to the inner wall of the heat insulation plate and is used for increasing the heat discharging speed during cooling, and a fan is located in a middle ring of the annular barrel and is used for increasing the heat discharging speed during cooling. Heat is driven to flow out of the shell through the through holes in the outer wall of the annular barrel by driving the shell to open towards the two sides and then passing through the fan and