Laser hot stamping equipment dedicated rotary joint structure is more simple, smaller, lighter, sealed and stable performance, easy maintenance, but also similar products in the most widely used. Outer tube connected directly to the roller or drying cylinder, the main rotating parts; after finishing the outer tube spherical, spherical bottom and impregnated carbon graphite seal ring seal composed of a reliable dynamic seal friction, the spherical sealing ring The housing slide within the annular space, combined with oil-free bearings and work closely with the shell, the rotary joint free support, so the installed capacity of less precision; spherical sealing ring wear, thanks to the spring pre-load compensation at any time , the compensation when the shell slowly moving backwards. And through the outer tube of the groove to seal the sealed observation wear; when steam, water or other medium flows through the spherical bearing oil seal ring and when, to form a thin film, to provide sealing and lubrication, thereby reducing friction and wear, extending service life. Maintenance more convenient than the Q-type (product shelf-life 365 days)