Device for assisting mandrel to penetrate into shell in specified track

The utility model relates to a device for assisting a core shaft to penetrate into a shell in a specified track, which comprises a shell and a core shaft, the middle part in the shell is a spiral surface, and the core shaft is arranged in the shell in a penetrating manner and is coaxial with the shell; sleeves are arranged at the two ends of the mandrel in a penetrating mode, the sleeves and the mandrel are coaxially arranged, and three rolling structures are evenly arranged on the outer circumferences of the sleeves; the rolling structure comprises a bottom plate, a lug plate, a steel ball and a pin shaft, the bottom plate is fixedly welded to the sleeve, the lug plate is fixedly welded to the bottom plate, and the steel ball is installed on the lug plate through the pin shaft. The core shaft is used as a mold for pressing and injecting a rubber gasket, the appearance cannot be scratched during use and storage, a plating layer cannot fall off, auxiliary devices are arranged at the two ends of the core shaft,