Thin-wall annular blank device

The invention discloses a thin-wall annular blank device and relates to the field of pipe blank continuous casting. A tundish of the thin-wall annular blank device is provided with a first water gap and a second water gap; an inner crystallizer and a two-lug type outer crystallizer are arranged on the lower portion of the thin-wall annular blank device, the inner crystallizer is arranged inside the two-lug type outer crystallizer, and the inner crystallizer and the two-lug type outer crystallizer are fixed on a crystallizer supporting frame; a vibration device is arranged on the lower portionof the supporting frame; an outer nozzle is arranged on the lower portion of the two-lug type outer crystallizer, and an inner nozzle is arranged on the lower portion of the inner crystallizer; shielding covers are arranged below the crystallizers; and a cutting device is arranged on the lower portion of a clamping and conveying roller. According to the thin-wall annular blank device, the outer crystallizer is in a two-lu