Giant tire bead supporting presetting device

The utility model relates to a giant tire bead supporting presetting device, and belongs to the field of tire production equipment. A hydraulic cylinder is installed on the base, the two ends of the hydraulic cylinder are hinged to a movable disc and a fixed disc respectively, a pneumatic claw piece is connected with an air cylinder rod of an air cylinder, the pneumatic claw piece is connected with a linear bearing of a guide rail pair, and a fixing base of the air cylinder is connected with a guide rail of the guide rail pair and connected with a copper sliding block a and a copper sliding block b through a fixing shaft. Air cylinder position detection switches ab are installed at the front end and the rear end of the air cylinder, the pneumatic claw piece, the air cylinder, the guide rail pair and the air cylinder position detection switches ab form a pneumatic claw piece mechanism, and the hydraulic cylinder can push the movable disc to rotate and move in the fixed disc with the movable disc guide wheel as