Abrasive belt air bag type tensioning device for sander system

The utility model discloses an abrasive belt air bag type tensioning device for a sander system. Characterized in that it is characterized in that it comprises, including an even number of airbags, anair pressure output device and an air bag fixing device which are lower than 5.5 ba; the sanding machine system comprises a sanding machine and a tensioning roller. An air cylinder is further arranged between the sanding machine and the tensioning roller. The even number of air bags are symmetrically arranged on the two sides of the air cylinder between the sanding machine and the tensioning roller. The air bag fixing device is used for fixedly connecting the upper ends and the lower ends of the air bags with a roller seat of a tensioning roller and a sander respectively, so that the air bagsare fixed between the sander and the tensioning roller, and the air pressure output device is used for outputting air pressure into the air bags to enable the air bags to be expanded. The air bag andthe air cylinder are combi