Limiting and fixing mechanism

The utility model discloses a limiting fixing mechanism which comprises a supporting plate, air cylinders are fixedly installed on the two sides of the top of the supporting plate, a containing plate is fixedly installed at the output ends of the air cylinders, and moving plates are arranged on the two sides of the top of the containing plate. The threaded rod is rotated through the rotary disc, then the threaded rod drives the mounting plate to move downwards, the mounting plate drives the spring and the limiting plate to move downwards, then the limiting plate moves downwards to extrude and limit cloth, the cloth can be protected under the action of the protective pad, hard contact between the limiting plate and the cloth can be reduced under the action of the spring, and the cloth is prevented from being damaged. According to the limiting device, the cloth is prevented from being damaged by the limiting plate, the protection effect of the cloth during limiting is further improved, and meanwhile the problem