Hoop

The hoop comprises a lower hoop body and an upper hoop body, the lower hoop body and the upper hoop body are in a semicircular shape, one end of the lower hoop body is connected with a first rotating shaft, the surface of the first rotating shaft is movably connected with the upper hoop body, and the other end of the lower hoop body is connected with a locking mechanism. The locking mechanism is far away from the first rotating shaft, a movable groove is formed in the lower clamp, a fixed groove is formed in the other end, far away from the first rotating shaft, of the upper clamp, the movable groove and the fixed groove are both far away from the first rotating shaft, and the locking mechanism is located in the movable groove. Therefore, the conditions that the models of the lower clamp and the upper clamp are taken by mistake and the lower clamp and the upper clamp which are not in the same batch are used in a mixed mode in the using process are avoided. 本实用新型公开了一种卡箍，包括下卡箍和上卡箍，所述下卡箍和上卡箍的形状呈半圆供状，所述下卡箍的一端连接第一