Rolling type heringbon spile of plastic film blowing machine

The utility model relates to a plastic film blowing machine, particularly a rolling type lambdoidal flashboard of a plastic film blowing machine, which comprises lambdoidal boards and is clamped at the front side and the back side of a film bubble, and sharp flashboards which are clamped at the left and the right two sides, wherein each lambdoidal board or each flashboard is composed of a main frame, shaft rods and a plurality of segment pipes which are sheathed in series on the shaft rods, and the shaft rods are provided with top and bottom intervals in the main frame. Conventional pine bars are changed into the segment pipes which are connected in series to a shaft to cause the sliding contact of the lambdoidal boards, the flashboards and a thin film to be changed into the rolling contact, so the acting force and the frictional resistance to the thin film is small, the damage of the thin film is reduced, thus the quality of the thin film is improved, and simultaneously, the utility model has the advantages of simple structure, low cost and convenient installation.