Brake device for belt drive spindle

The utility model discloses a brake device for a belt drive spindle. The brake device comprises a brake pad (1) and at least one guide roller arm (2), wherein one face of the brake pad (1) is in an arc shape, and the guide roller arm (2) is provided with a guide roller (3). The guide roller arm (2) is fixedly connected to an extension portion of at least one end of the two ends of an arc-shaped face (11). The brake device is characterized in that a bearing of the guide roller (3) is connected to the tail end of the guide roller arm (2), and one part of the guide roller (3) is exposed out of the tail end of the guide roller arm (2). The brake device has the advantages that the guide roller is arranged at the front end of the brake device, the guide roller is adopted to enable a belt and a spindle shaft to be disengaged so as to enable the spindle to lose power; rolling friction between the guide roller and the belt has little damage to the belt; brake of the brake belt on the spindle shaft is only based on rot