Lock cylinder

Abstract

The present invention relates to a new type of lock cylinder, including a first outer shell. A hollow tube is mounted inside the first outer shell, a first fitting is mounted inside the hollow tube, a lock core is movably mounted inside the first fitting, and a dial disc is 5 movably arranged on an outer surface of the first fitting. When unlocking, a user rotates the key to drive the dial disc to rotate synchronously; the dial disc is matched with a concave block of the second fitting, thus driving the second fitting to move downwards and compress the first spring. As the second fitting moves downwards, small cylindrical clamping pieces originally abutted by the T-shaped clamping blocks on side walls lose 10 support, protrude outwards and disengage from insertion angle grooves.