Movable automatic gas exhausting mechanism and ventilation device thereof

The utility model discloses a movable gas automatic air draft mechanism and a ventilation device thereof, the mechanism comprises a fan and an air draft pipeline which are connected with each other, an air draft opening of the air draft pipeline is provided with a gas monitor and an air volume meter, and the fan is arranged on a sliding rack. The mode that the gas monitor and the air volume meter are arranged at the air suction opening is adopted, so that the air suction mechanism can automatically conduct a corresponding ventilation mode according to the air volume, the air direction and the gas concentration, and the problem that in the prior art, ventilation is not timely due to manual operation is solved; furthermore, the mode that the draught fan is arranged on the sliding rack is adopted, the draught fan can be conveniently pushed in or pulled out, the problem that in the prior art, due to the fact that the draught fan is fixed, movement is inconvenient is solved, and furthermore, the sliding rack is co