When the beverage liquid is flowing from feed tube to sealing machine during production, the feed tube is in still state and the machine is rotating, so the dynamic sealing technology for the feed tube is particularly important. The "V"-ring is used to achieve the dynamic sealing for the feed tube of the current sealing machine on the world. It has some problems, for example, ring is easy to aging, short service life span, hard to replacing, expensive and so on. By the research on the dynamic sealing, a new dynamic sealing structure is developed. A spring structure has been used to achieve the flexible and dynamic connection for the feed tube, and transfer the friction surface to the interface of double silicon carbon rings. Through application, the result shows that this technology has some advantages, such as long life span, easy to replace and low cost.