Application: apply to tire re-tread and vulcanizing and specially apply to steel wire radial tire. Structure feature: Adopt circular ring-oriented locking, and motivation adopting oil pressure. There are two kinds of control mode: manual and automatic. The automatic control can be divided into two ways: conventional relay chain control and veneer computer ones. The main technical data: Application scope: 125SR12-12.00R20 ( four kinds spec.) ; Bearing maximal inner pressure: 2MPa; Controlling gas source pressure: 0.3Mpa; Oil station working pressure: 4Mpa; Voltage: 220-380v 50HZ.