Hot air circulating device capable of achieving self-adaptive circulating heating

The utility model discloses a hot air circulating device capable of realizing self-adaptive circulating heating, which relates to the technical field of hot air circulation of ball rolling machines, solves the problem of hysteresis of a temperature control system of the ball rolling machines, and is technically characterized by comprising a heating square box which is provided with a heater communicated with the interior of the heating square box; the heater is communicated with a wind wheel direction channel through an upper air channel, a wind wheel is arranged in the wind wheel direction channel, an air door is arranged below the wind wheel and connected into the upper air channel through an air door rotating shaft, the air door is further connected with an expander at the position of the air door rotating shaft, and the expander controls the opening and closing size of the air door through the temperature change of air in the upper air channel. The upper air duct is connected to anair outlet of the heatin