Mechanical lock

The invention discloses a mechanical lock. The mechanical lock comprises a front lock tube, a rear lock tube, an emergency lock cylinder, a lock rod and a shifting wheel, wherein the emergency lock cylinder and the lock rod are arranged in the front lock tube and the rear lock tube; the shifting wheel is arranged between the front lock tube and the rear lock tube and connected with the emergency lock cylinder and the lock rod through a separation and reunion assembly; a key groove of the emergency lock cylinder is a blind hole; a push block assembly is arranged between the emergency lock cylinder and the separation and reunion assembly; the push block assembly comprises a push block movably arranged in the rear portion of the emergency lock cylinder and a thrust column arranged on the push block in the radial direction; an inclined groove matched with the thrust column is formed in the side wall of the rear portion of the emergency lock cylinder; and a straight sliding groove matched with the thrust column on the push block and an annular sliding groove located in the rear end of the straight sliding groove are formed in the inner wall of the front lock tube. According to the mechanical lock, the key groove is designed to be the blind hole in the emergency lock cylinder, and the separation and reunion assembly is isolated from the key groove, so that the problem that a motor assembly idles and cannot be unlocked due to the fact that the lock rod is in an idling state when a tool is inserted into the key groove to push the separation and reunion assembly is fundamentally solved.