1. Material and structure: full-bristle brush (suitable for fine dust) and other types; 2. Operating principle: When the roller brush rotates at high speed, the bristles sweep dust, debris, hair, etc. from the ground into the suction channel, which is then inhaled into the dust box by the fan; some roller brushes have self-cleaning functions, which can be automatically cleaned through the main body or base station; 3. Maintenance points: Regularly clean the hair and thread ends entangled in the roller brush to avoid blockage and affecting the r