Turn-up device and tire building method using turn-up device

A turn-up device, comprising a building machine main shaft, an outer sleeve device, a ply down finger assembly, a bladder device, a bead setting device, and a bead locking device, wherein:

• the outer sleeve device, the ply down finger assembly and the bladder device are all sleeved on the building machine main shaft, and the outer sleeve device is located on outer sides of the ply down finger assembly and the bladder device along a radial direction of the building machine main shaft;
• and the bead setting device is located on the outer sleeve device;
• wherein the bladder device comprises:
• a sealing inner sleeve sleeved on the building machine main shaft;
• a sealing outer sleeve sleeved at an outer side of the sealing inner sleeve;
• and
• a bladder seat configured to mount a bladder;
• wherein the bead locking device comprises:
• a cylinder body mounted on an outer side of the sealing outer sleeve, the bladder seat is mounted on the cylinder body;
• a chamber formed by the cylinder body and the sealing outer sleeve;
• a piston partially mounted in the chamber and having an axial end outside the chamber;
• a sliding disk connected to the axial end of the piston and having an inclined plane, the sliding disk is entirely located outside the chamber;
• a supporting member fixedly connected to the cylinder body;
• a mandril passing radially through the supporting member, a bottom of the mandril abuts against the inclined plane through a rolling mechanism;
• and
• a locking block located on a radially inner side of the bladder and arranged at a top of the mandril.