Sliding friction and rolling friction interconvertible stopper

The invention discloses a sliding friction and rolling friction interconvertible stopper. The sliding friction and rolling friction interconvertible stopper comprises a stopper main arm and a limitingbox. A cavity of the limiting box is internally and symmetrically provided with two sets of leaf springs and two interconvertible hemispherical sliding blocks. The leaf springs are rolling type leafsprings or sliding type leaf springs. The interconvertible hemispherical sliding block connected with the rolling type leaf springs is further provided with balls. The upper face and the lower face ofthe stopper main arm are both provided with hemispherical guiding grooves. When the stopper main arm penetrates through the interconvertible hemispherical sliding block on the rolling type leaf springs, the balls are matched with the hemispherical guiding grooves; and when the stopper main arm penetrates through the interconvertible hemispherical sliding block on the sliding type leaf springs, the hemispherical groove in t