Multifunctional strengthened lock structure

A multifunctional strengthened lock structure, comprising:

• a case, which is provided with a square latch, a bolt, and a lock-cylinder rotating axle, a handle rotating axle, and an own-axis rotating plate;
• a strengthened triangular latch unit, which is arranged in the case and comprises a latching head, a rod pivotally connected to the latching head, a strengthening ring fit over the rod, and a strengthening screw fastened to the latching head and the rod;
• and
• a bolt control unit, which comprises a first push plate arranged at one side of the handle rotating axle;
• a second push plate arranged at a lower side of the first push plate;
• a butterfly plate arranged between the first push plate and the second push plate;
• a first spring mounted to the case and having upper and lower ends respectively supported on the second push plate and a lower wall surface of the case;
• and a second spring and a third spring arranged at a lower side of the butterfly plate;
• wherein by means of the triangular latch unit and the bolt control unit, the locked is strengthened and achieves a dual-locking effect to thereby improve effects of security and burglary resistance of the lock.