Movable arm type welding fume purification device for machine workshop

The utility model discloses a movable arm type mechanical workshop welding fume purification device which comprises a stand column, a lifting device, a guiding device, a swing arm device, a ventilation pipeline, a gas collecting hood and a welding fume dust remover. The lifting device is installed on the upper portion of the stand column, and the guiding device is installed in the middle of the stand column through a rail and can move up and down along the rail; the swing arm device is fixedly connected with the guide device and is perpendicular to the stand column. The ventilation pipeline is an L-shaped pipeline, the lower half portion of the ventilation pipeline is installed on the lower portion of the stand column, the upper half portion of the ventilation pipeline is fixed to the swing arm device, and the upper end and the lower end of the ventilation pipeline are connected with the welding fume dust remover and the gas collecting hood respectively. The modular design of the device can be arranged accord