Novel mechanical safety lock mechanism

The utility model belongs to the technical field of safety protection lock mechanisms, and particularly relates to a novel mechanical safety lock mechanism. The novel mechanical safety lock mechanism is compact in structure and small in occupied space. The lock comprises a lock frame SJ-1 and is characterized in that a lock bar penetrating opening 1 is formed in the middle of the lock frame SJ-1, a lock bar ST-1 penetrates through the lock bar penetrating opening 1, and lock teeth 4 of the lock bar ST-1 face downwards; a lock block inserting opening 2 is formed in the position, below the lock bar penetrating opening 1, of the lock frame SJ-1, the lock block SK-1 is inserted into the lock block inserting opening 2, and a lock head 3 at the upper end of the lock block SK-1 is exposed out of the lock block inserting opening 2 and arranged in a groove 8 of a lock tooth 4 of the lock bar ST-1. Telescopic rod penetrating openings 5 of the hydraulic oil cylinder are formed in the lock frame SJ-1 on the two sides of