Abrasive belt tensioning structure of precision casting sprue grinding device

The utility model discloses an abrasive belt tensioning structure of a precision casting sprue grinding device. The device structurally comprises a base, a vertical plate, a first bolt, a wheel shaftsleeve, a second bolt and a rotating shaft, a quick locking device is arranged at the left upper end of the vertical plate; the movable block is inserted into the rotating block; the rotating block isdriven to rotate along the inclined slot by rotating the tensioning wheel; the fixing rod is clamped into the clamping hole; rotation of fixed rotating block, meanwhile, the bump is limited through the mounting base; the movable block is prevented from being pulled out of the rotating block; the effect of quickly locking the rotating shaft is achieved; the buckle mechanism is arranged in the middle of the front end face of the mounting base, the pull ring is loosened, the micro spring loses stress and stretches, the micro spring drives the fixing rod to reset, the fixing rod is inserted intothe clamping hole, the effe